JP4420393B2 - Refrigeration air conditioner - Google Patents

Description

  The present invention relates to a refrigeration air conditioner that performs both air conditioning and refrigeration, and is particularly suitable for a refrigeration air conditioner in which the air conditioner and the refrigeration apparatus have independent refrigerant circuits.

  As a conventional refrigeration air conditioner that performs both air conditioning and refrigeration, there is one disclosed in Japanese Patent Application Laid-Open No. 2002-277097 (Patent Document 1). In the refrigerating and air-conditioning apparatus of Patent Document 1, the heat transfer tubes of the outdoor heat exchanger are shared for air conditioning and freezing, and a single refrigerant is used.

  Moreover, as a conventional refrigeration air conditioner, there is one disclosed in JP 2001-289532 A (Patent Document 2). The refrigerating and air-conditioning apparatus according to Embodiment 9 of Patent Document 2 constitutes an air-conditioning refrigeration cycle with an air-conditioning refrigerant circuit having an air-conditioning heat transfer tube that becomes a condenser during cooling operation and an evaporator during heating operation, and is always condensed. A refrigeration cycle is configured by a refrigeration refrigerant circuit having a refrigeration heat transfer tube serving as a refrigerator, and the air conditioning heat transfer tube and the refrigeration heat transfer tube are integrally formed via a heat transfer fin, thereby refrigeration air conditioning heat. The exchanger is configured to include a blower that ventilates the refrigeration air-conditioning heat exchanger.

JP 2002-277097 A JP 2001-289532 A

However, in the refrigerating and air-conditioning apparatus of Patent Document 1 described above, the heat transfer pipe of the outdoor heat exchanger is shared for air-conditioning and freezing, and a single refrigerant is used. Therefore, it is necessary to perform the refrigeration cycle operation in accordance with either one (usually the lower) evaporation temperature. Therefore, air conditioning, it is difficult to perform a refrigeration cycle operation that is appropriate to both the refrigeration.

  In the refrigerating and air-conditioning apparatus disclosed in Patent Document 1, during the heating operation on the air conditioning side, the outdoor heat exchanger on the air conditioning side serves as an evaporator and the outdoor heat exchanger on the freezing side serves as a condenser. In order to balance the amount of heat released and the amount of heat absorbed, it is necessary to switch the outdoor heat exchanger to either the evaporator or the condenser mode according to the size of the air conditioning heating capacity and the refrigeration cooling capacity. However, in a convenience store that is a typical example in which this type of device is used, two to three air conditioner side indoor units and five to seven showcases that are refrigeration side coolers are often connected. As these devices are turned on and off, complicated mode switching occurs, resulting in reliability problems such as energy loss accompanying switching operation and incomplete switching of the four-way valve.

  On the other hand, the refrigerating and air-conditioning apparatus of Patent Document 2 described above does not disclose anything about the control of the blower that ventilates the refrigerating and air-conditioning heat exchanger. In the refrigerating and air-conditioning apparatus disclosed in Patent Document 2, for example, when the amount of ventilation of the blower that is ventilated to the air-cooled heat exchanger is constant, the following problem occurs. That is, when the air-conditioning heat transfer tube is air-cooled as a condenser, the refrigeration heat-transfer tube also operates as a condenser, so that the entire refrigeration air-conditioning heat exchanger functions as a condenser. As a result, the condensation pressure of either the air conditioning refrigerant circuit or the refrigeration refrigerant circuit may be extremely increased, which causes a problem that it is difficult to perform an operation suitable for both refrigerant circuits. Further, when the air-conditioning heat transfer tube is heated as an evaporator, the refrigeration heat transfer tube operates as a condenser, which causes a problem that it is difficult to perform an operation suitable for both refrigerant circuits.

  Therefore, it is conceivable that the heat exchanger for air conditioning and the heat transfer pipe for refrigeration are completely separate, and a fan is provided independently for each heat exchanger. Problem arises.

  An object of the present invention is to obtain a refrigerating and air-conditioning apparatus capable of appropriately operating the air-conditioning refrigerant circuit and the refrigerating refrigerant circuit while downsizing the entire apparatus.

In order to achieve the above object, the present invention comprises an air-conditioning refrigeration cycle having an air-conditioning refrigerant circuit having an air-conditioning heat transfer tube which becomes a condenser during cooling operation and becomes an evaporator during heating operation, and is used for refrigeration as a condenser. A refrigeration cycle is configured by a refrigeration refrigerant circuit having a heat transfer tube, and the refrigeration air conditioning heat exchanger is configured by integrally forming the air conditioning heat transfer tube and the refrigeration heat transfer tube via a heat transfer fin. In the refrigerating and air-conditioning apparatus comprising a blower that ventilates the refrigerating and air-conditioning heat exchanger, when the air-conditioning heat transfer tube is air-cooled as a condenser, the higher one of the air-conditioning refrigerant circuit and the refrigerating refrigerant circuit A control device that controls the rotational speed of the blower based on the condensing pressure of the refrigerant, and the control device is a type in which a refrigerant used in the refrigerant circuit for air conditioning is different from a refrigerant used in the refrigerant circuit for freezing. If it is When the air-conditioning heat transfer tube is air-cooled as a condenser, the condensation pressure of the refrigerant used in the refrigerant circuit for air-conditioning is changed to the physical property value of the refrigerant used in the refrigerant circuit for freezing corresponding to the same saturation temperature. Based on the condensation pressure of the air-conditioning refrigerant so as to correspond to the condensing pressure of the air-conditioning refrigerant, and the correction-condensed condensing pressure is compared with the condensing pressure of the refrigeration refrigerant circuit to obtain the higher condensing pressure. Based on this, the rotational speed of the blower is controlled .

In order to achieve the above object, the present invention comprises an air-conditioning refrigeration cycle having an air-conditioning refrigerant circuit having an air-conditioning heat transfer tube which becomes a condenser during cooling operation and becomes an evaporator during heating operation, and becomes a condenser. A refrigeration cycle is constituted by a refrigeration refrigerant circuit having a refrigeration heat transfer tube, and the refrigeration air conditioning heat exchanger is formed by integrally forming the air conditioning heat transfer tube and the refrigeration heat transfer tube via a heat transfer fin. In the refrigerating and air-conditioning apparatus comprising the blower that is configured to ventilate the refrigerating and air-conditioning heat exchanger, when the air-conditioning heat transfer tube is cooled as a condenser, the air-conditioning refrigerant circuit and the refrigerating refrigerant circuit are either A control device that controls the rotational speed of the blower based on a higher condensing pressure is provided, and the control device evaporates the air conditioning refrigerant circuit when the air conditioning heat transfer tube is heated as an evaporator. Based on pressure In that so as to control the rotational speed of the blower.
A more preferable specific configuration example of the present invention is as follows.
(1) pre-SL control apparatus, when the air-conditioning heat-transfer tube is heating operation as an evaporator, on the basis of the evaporation pressure of the air conditioning refrigerant circuit, controlling the rotation speed of the blower.
( 2 ) In addition to the above ( 1 ), a condensing pressure adjusting device that adjusts the condensing pressure of the refrigerant circuit for refrigeration when the air-conditioning heat transfer tube is heated as an evaporator is provided.
( 3 ) In addition to ( 2 ), the condensing pressure adjusting device is constituted by a condensing pressure adjusting valve, the condensing pressure adjusting valve is provided in the refrigerant circuit for refrigeration, and the heat transfer tube for air conditioning serves as an evaporator. When the heating operation is performed, the throttle operation is performed so that the condensing pressure of the refrigerant circuit for refrigeration becomes a predetermined pressure or more.
( 4 ) In addition to any one of ( 1 ) to ( 3 ), in the refrigeration air conditioning heat exchanger, the heat transfer tubes form a plurality of rows with respect to the flow direction of the air flowing in by driving the blower. The heat transfer tubes belonging to the refrigerant circuit for refrigeration are arranged so as to be positioned in a row upstream of the air flow.

In order to achieve the above object, the present invention comprises an air-conditioning refrigeration cycle having an air-conditioning refrigerant circuit having an air-conditioning heat transfer tube which becomes a condenser during cooling operation and becomes an evaporator during heating operation, and becomes a condenser. A refrigeration cycle is constituted by a refrigeration refrigerant circuit having a refrigeration heat transfer tube, and the refrigeration air conditioning heat exchanger is formed by integrally forming the air conditioning heat transfer tube and the refrigeration heat transfer tube via a heat transfer fin. In the refrigerating and air-conditioning apparatus comprising the blower configured to ventilate the refrigeration air-conditioning heat exchanger, when the air-conditioning heat transfer tube is heated as an evaporator, the blower is based on the evaporation pressure of the air-conditioning refrigerant circuit And a condensing pressure adjusting device for adjusting the condensing pressure of the refrigeration refrigerant circuit when the air-conditioning heat transfer tube is heated as an evaporator .

A more preferable specific configuration example of the present invention is as follows.
(1) before SL refrigerating and air-conditioning heat exchanger, the flow direction of the air flowing by the driving of the blower is arranged so as the heat transfer tubes form a plurality of columns, heat belonging to the refrigeration refrigerant circuit It is configured so that the heat pipes are positioned in a row upstream of the air flow.

According to the present invention, constitutes a refrigeration air conditioning heat exchanger formed integrally with the air-conditioning heat-transfer pipe and the refrigerating heat transfer pipe through the heat transfer fins, the air-conditioning heat-transfer tube is cooling operation as a condenser A control device that controls the rotational speed of the blower based on the higher condensing pressure of the air conditioning refrigerant circuit or the refrigeration refrigerant circuit, and the control device is used in the air conditioning refrigerant circuit. When the refrigerant used in the refrigerant circuit for refrigeration is of a different type, the condensation pressure of the refrigerant used in the refrigerant circuit for air conditioning when the heat transfer tube for air conditioning is cooled as a condenser Based on the physical property value of the refrigerant used in the refrigerant circuit for refrigeration corresponding to the same saturation temperature to obtain a condensed pressure converted to be compatible with the condensed pressure of the air conditioning refrigerant, and the corrected converted condensed pressure and the Condensation pressure of refrigerant circuit for refrigeration Since Tsukamatsu較to based on any higher condensing pressure so as to control the rotational speed of the blower, while miniaturizing the whole apparatus, suitable for each of the refrigeration refrigerant circuit and the air conditioning refrigerant circuit Thus, a refrigerating and air-conditioning apparatus that can perform an appropriate operation on the air-conditioning refrigerant circuit and the refrigerating refrigerant circuit using a simple refrigerant is obtained.

Further, according to this onset bright, constitutes a refrigeration air conditioning heat exchanger formed integrally with the air-conditioning heat-transfer pipe and refrigeration heat transfer pipe through the heat transfer fins, the air-conditioning heat exchanger tube as a condenser A control device that controls the rotational speed of the blower based on the higher condensing pressure of the air conditioning refrigerant circuit or the refrigeration refrigerant circuit during cooling operation, and the control device includes the air conditioning heat transfer tube Is controlled as the evaporator, the rotational speed of the blower is controlled based on the evaporation pressure of the air conditioning refrigerant circuit, and the air conditioning refrigerant circuit and In the winter when the refrigerant circuit for refrigeration can be appropriately operated, and the rotational speed is increased in accordance with a decrease in the outside air temperature so as to suppress a decrease in the evaporation temperature of the air conditioning and heating, so that the heating load is larger than the refrigeration load. Necessary air conditioning heating capacity Retention can be refrigeration and air conditioning device can be obtained.

  According to a preferred specific configuration of the present invention, since the air-conditioning heat transfer tube is provided with a condensing pressure adjusting device that adjusts the condensing pressure of the refrigerant circuit for refrigeration when heating operation is performed as an evaporator. , While ensuring the necessary air conditioning heating capacity in the winter when the heating load is greater than the refrigeration load, the refrigeration condensing pressure decreases because the air volume is greater than the required air volume on the refrigeration side, and the pressure 址 falls below the specified value. It is possible to avoid a problem in the differential pressure oil supply inside the compressor, and it is possible to secure a stable operation on the refrigeration side that is hardly affected by the air volume on the air conditioning side.

  According to a preferred specific configuration of the present invention, the refrigeration air conditioning heat exchanger is arranged such that heat transfer tubes form a plurality of rows with respect to a flow direction of air flowing in by driving the blower. Since the heat transfer tubes belonging to the refrigerant circuit for refrigeration are positioned upstream of the air flow, a part of the condensation heat in the heat transfer tubes belonging to the refrigerant circuit for refrigeration is used for air conditioning. The air temperature at the inlet of the heat exchanger is increased, and during the heating operation of the air conditioning, this temperature rise acts as an amount of heat absorbed into the air conditioning heat transfer pipe as an evaporator, leading to an improvement in heating capacity. Moreover, since the amount of frost formation of the heat exchanger for air conditioning decreases from the time of normal operation, it can be expected to improve the deterioration of the air conditioning heating capacity.

Further, according to the present invention, the air-conditioning heat transfer tube and the refrigeration heat transfer tube are integrally formed through the heat transfer fin to constitute the refrigeration air-conditioning heat exchanger, and the air-conditioning heat transfer tube is heated as an evaporator. A control device that controls the rotational speed of the blower based on the evaporation pressure of the air conditioning refrigerant circuit when operated, and the refrigeration refrigerant when the air conditioning heat transfer tube is heated as an evaporator Since the condensing pressure adjusting device for adjusting the condensing pressure of the circuit is provided , it is possible to appropriately operate the air conditioning refrigerant circuit and the refrigeration refrigerant circuit while reducing the size of the entire device , and the heating load is refrigerated. While ensuring the required air conditioning heating capacity in the winter season when it exceeds the load, the refrigeration condensing pressure decreases because the air volume is larger than the required air volume on the refrigeration side, and the pressure drop falls below the specified value, causing a difference in the compressor. Pressure lubrication It is possible to avoid the trouble that out, the refrigeration air conditioning system is obtained which can ensure less susceptible stable refrigerating side operation the effect of the air-conditioning side airflow.

  Hereinafter, a refrigerating and air-conditioning apparatus according to an embodiment of the present invention will be described with reference to FIGS.

  First, the configuration of the refrigerating and air-conditioning apparatus according to the present embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a configuration diagram of a refrigeration air-conditioning apparatus according to an embodiment of the present invention, and FIG. 2 is a model diagram showing a path arrangement form of heat transfer tubes of the refrigeration air-conditioning heat exchanger of FIG.

  The refrigeration air conditioner 100 includes one outdoor unit 110, a plurality (two in the illustrated example) of air conditioning indoor units 120, and a plurality (five in the illustrated example) of refrigeration indoor units 130. . These components 110, 120, and 130 are connected via refrigerant piping, electrical wiring, signal wiring, and the like. The outdoor unit 110 is installed outside the building 140 (outside the room), and the air conditioning indoor unit 120 and the freezing indoor unit 130 are installed inside the building 140 (the room). The freezing indoor unit 130 includes a refrigerated showcase, a freezing showcase, and the like.

  The refrigeration air conditioner 100 includes an air conditioning refrigerant circuit 101, a refrigeration refrigerant circuit 102, and a controller 200. The controller 200 is configured by a microcomputer or the like, and is a control device that controls the components of the air conditioning refrigerant circuit 101 and the refrigeration refrigerant circuit 102, the fans 40, 53, 63, and the like.

Air conditioning refrigerant circuit 101, the air conditioning compressor 1, the four-way valve 12, the refrigerating air-conditioning heat exchanger 3, the receiver 4, the accumulator 6, the outdoor unit 110 and the outdoor expansion valve 13 as a main part of the outdoor side The indoor air conditioning heat exchanger 51 and the indoor expansion valve 52 are provided in the air conditioning indoor unit 120 as main components on the indoor side.

  The air conditioning indoor unit 120 is provided with an indoor air conditioning blower 53. By rotating the indoor air conditioning blower 53, the indoor air is sucked into the air conditioning indoor unit 120 and used for indoor air conditioning. Heat exchange with the heat exchanger 51 is forcibly (heated or cooled), and the indoor unit 120 for air conditioning is blown into the room to heat or cool the room.

On the other hand, the refrigeration refrigerant circuit 102, the refrigeration compressor 21, the refrigerating air-conditioning heat exchanger 3, the receiver 24, the accumulator 26, provided in the outdoor unit 110 of the condensing pressure regulating valve 23 as a main part of the outdoor side, The indoor refrigeration heat exchanger 61 and the indoor expansion valve 62 are provided in the refrigeration indoor unit 130 as main indoor components. The refrigerant flow paths of the air conditioning refrigerant circuit 101 and the refrigeration refrigerant circuit 102 are formed completely independently.

  An indoor refrigeration blower 63 is disposed in the refrigeration indoor unit 130. When the indoor refrigeration blower 63 rotates, the air in the refrigerator indoor unit 130 is circulated to exchange heat for indoor refrigeration. The inside of the freezing indoor unit 130 is cooled in the refrigerator.

  As shown in FIG. 2, the refrigeration and air conditioning heat exchanger 3 includes an air conditioning heat transfer pipe 3 a of an outdoor air conditioning heat exchanger of the air conditioning refrigerant circuit 101 and an outdoor refrigeration heat exchanger of the refrigeration refrigerant circuit 102. The refrigeration heat transfer tube 3b and a heat transfer fin 3c provided between them are configured. In other words, the refrigeration and air conditioning heat exchanger 3 is configured by a plate-inch-in-tube heat exchanger in which an air conditioning heat transfer tube 3a and a refrigeration heat transfer tube 3b are integrally formed via a heat transfer fin 3c.

  One blower 40 for sending outdoor air to the refrigeration / air-conditioning heat exchanger 3 is provided. In the refrigeration and air conditioning heat exchanger 3, all the heat transfer tubes 3b of the refrigeration path are arranged upstream of the air flow generated by the blower 40, and a part of the heat transfer tubes 3a of the air conditioning path is part of the refrigeration path. Like the heat transfer tube 3b, it is arranged on the upstream side of the air flow, and the remaining heat transfer tube 3a is arranged on the downstream side of the air flow.

  Next, the operation | movement at the time of air_conditionaing | cooling operation of the refrigerating and air-conditioning apparatus 100 is demonstrated, referring FIG.1, FIG.3 and FIG.4.

  When the cooling operation of the refrigerating and air-conditioning apparatus 100 is started, the refrigerant flows as indicated by solid line arrows in FIG. The high-temperature refrigerant for air conditioning discharged from the air-conditioning compressors 1 and 2 is joined by the oil separator 5 through the silencer 7 and the check valve 9. In the oil separator 5, the refrigerating machine oil contained in the discharged refrigerant is separated and returned to the suction side pipe through the oil return circuit 11. On the other hand, the high-temperature refrigerant from which the refrigeration oil is separated by the oil separator 5 flows in the direction of the solid line in FIG. 1 during cooling by the four-way valve 12 and flows into the heat transfer tube 3a of the air conditioning path of the heat exchanger 3 for refrigeration air conditioning. The

  This high-temperature refrigerant is radiated and condensed in the outdoor air sent by the blower 40 in the heat exchanger 3 for refrigeration and air conditioning. The condensed liquid refrigerant is once collected in the liquid receiver 4 via the check valve 10 and then flows into the air conditioning subcooler portion 8 of the refrigeration air conditioning heat exchanger 3 where it is excessively exchanged by heat exchange with outdoor air. It is cooled and sent to the air conditioning indoor unit 120 through the blocking valve 14.

  The liquid refrigerant from the blocking valve 14 is depressurized by the indoor air conditioning expansion valve 52, and then heat-exchanged with the indoor air by the indoor air conditioning mature exchanger 51, and is absorbed and evaporated from the indoor air to cool the indoor air. To do. The air-conditioning refrigerant evaporated into the low-temperature gas returns to the outdoor unit 110 again from the blocking valve 15 and is sucked into the air-conditioning compressors 1 and 2 through the four-way valve 12 and the accumulator 6.

  On the other hand, in the refrigeration refrigerant circuit 102, the refrigerant flows as indicated by solid arrows in FIG. The refrigeration high-temperature refrigerant discharged from the refrigeration compressor 21 flows into the heat transfer pipe 3 b of the refrigeration path of the refrigeration air-conditioning heat exchanger 3 through the check valve 22. This high-temperature refrigerant is radiated and condensed in the outdoor air sent by the blower 40 in the heat exchanger 3 for refrigeration and air conditioning. The condensed liquid refrigerant is once collected in the liquid receiver 24 via the condensation pressure adjusting valve 23 which is an example of a condensing pressure adjusting device, and then flows into the refrigeration subcooler portion 25 of the refrigeration air conditioning heat exchanger 3. Then, it is supercooled by heat exchange with the outdoor air, and sent to the freezing indoor unit 130 through the blocking valve 27, the dryer 28, and the sight glass 29. The liquid refrigerant branched before the blocking valve 27 is decompressed by the liquid bypass circuit 31 and returns to the suction side pipe. The operation of the liquid bypass circuit 31 is controlled so as to be performed when the discharge gas temperature of the refrigeration compressor 21 rises above a predetermined temperature.

  The liquid refrigerant from the sight glass 29 is depressurized by the indoor refrigeration expansion valve 62 in the refrigeration indoor unit 130, and then is heat-exchanged with the air in the unit cabinet by the indoor refrigeration heat exchanger 61 and is absorbed from the air in the cabinet. The inside air is cooled by evaporation. The refrigeration refrigerant evaporated into the low temperature gas returns to the outdoor unit 110 again from the blocking valve 30 and is sucked into the refrigeration compressor 21 through the accumulator 26.

  At this time, the blower 40 is controlled by the operation flow of FIG. 3 or FIG. FIG. 3 is an operation flow when the air-conditioning refrigerant and the refrigeration refrigerant are of the same type, and FIG. 4 is an operation flow when they are of different types.

  During the cooling operation, as shown in FIGS. 3 and 4, the air pressure sensor 16 detects the condensation pressure A of the air conditioning refrigerant circuit 101 and inputs it to the controller 200 (step S1), and the refrigeration pressure. The condensation pressure B of the refrigerant circuit 102 for refrigeration is detected by the sensor 32 and input to the controller 200 (step S2). The air-conditioning pressure sensor 16 detects the pressure in the pipe line between the oil separator 5 and the four-way valve 12 that is a confluence on the discharge side of the two air-conditioning compressors 1 and 2. .

  When the air conditioning refrigerant and the refrigeration refrigerant are the same, the condensation pressure A and the condensation pressure B are directly compared as shown in FIG. 3 (step S4a). Further, when the air-conditioning refrigerant and the refrigeration refrigerant are of different types, the air-conditioning refrigerant is based on the physical property value of the air-conditioning refrigerant corresponding to the same saturation temperature as shown in FIG. The condensing pressure B ′ corrected and converted so as to correspond to the condensing pressure is obtained (step S3), and the condensing pressure A and the condensing pressure B ′ are compared (step S4b).

  Based on the higher pressure of the determination results, the controller 200 controls the rotational speed output of the blower 40 so as to suppress the increase in the condensation pressure. That is, when the condensing pressure A is higher than the condensing pressure B or B ′, the controller 200 controls the rotational speed of the blower 40 based on the condensing pressure A (step S5), and the condensing pressure B or B ′ is the condensing pressure. If it is higher than A, the rotational speed of the blower 40 is controlled based on the condensation pressure B (step S6). Instead of controlling the rotation speed of the blower 40 based on the condensation pressure B, the rotation speed of the blower 40 may be controlled based on the condensation pressure B ′.

  Next, the operation | movement at the time of the heating operation of the refrigerating air conditioner 100 is demonstrated, referring FIG. When the heating operation of the refrigerating and air-conditioning apparatus 100 is started, the refrigerant flows as indicated by the dotted arrows in FIG. The high-temperature air-conditioning refrigerant discharged from the air-conditioning compressors 1 and 2 flows to the four-way valve 12 in the same manner as during cooling, but the flow is switched in the dotted line direction by the four-way valve 12 and the air-conditioning passes through the blocking valve 15. Sent to the indoor unit 120. In the indoor unit for air conditioning 120, heat is exchanged with room air by the heat exchanger 51 for room air conditioning, and the room air is heated by releasing heat to the room air and condensing. The air-conditioning refrigerant condensed into the liquid refrigerant returns to the outdoor unit 110 again from the blocking valve 14 and flows into the air-conditioning subcooler portion 8 of the refrigerating and air-conditioning heat exchanger 3. Here, the refrigerant is supercooled by heat exchange with outdoor air and collected in the liquid receiver 4, and then depressurized by the expansion valve 13 and again into the heat transfer pipe 3 a of the air conditioning path of the refrigeration air conditioning heat exchanger 3. Inflow. The decompressed air-conditioning refrigerant exchanges heat with the outdoor air sent by the blower 40 in the refrigerating and air-conditioning heat exchanger 3 to be aged and evaporate. The air-conditioning refrigerant evaporated into the low-temperature gas is sucked into the air-conditioning compressors 1 and 2 through the four-way valve 12 and the accumulator 6.

  On the other hand, in the refrigeration refrigerant circuit 102, the refrigerant flows as indicated by solid arrows in FIG. That is, the refrigeration refrigerant circuit 102 performs the same refrigerant circuit operation during heating operation as during cooling operation. As a result, the refrigerating and air conditioning heat exchanger 3 functions as an evaporator in the heat transfer tube 3a of the air conditioning path and as a condenser in the heat transfer tube 3b of the refrigerating path. In this case, the blower 40 is controlled with the larger required air volume, but the heating operation is performed in the winter, and the refrigeration or refrigeration unit such as a showcase connected to the refrigerant circuit 102 for refrigeration is performed. Since the cooling load is small and the air volume necessary for condensation is small, an air volume suitable for the heating operation of the air conditioning refrigerant circuit 101 is selected.

  During the heating operation, the evaporation pressure C of the air conditioning refrigerant circuit 101 is detected by the air conditioning pressure sensor 17 and input to the controller 200, and the air volume is adjusted according to the decrease in the outside air temperature so as to suppress the decrease in the evaporation temperature of the air conditioning heating. The controller 200 controls the rotational speed output of the blower 45 so as to increase. The air-conditioning pressure sensor 17 detects the pressure in the pipe line between the accumulator 6 and the four-way valve 12, which is a confluence point on the suction side of the two air-conditioning compressors 1 and 2.

  At this time, the refrigeration refrigerant circuit 102 is operated with an air volume larger than that required for condensation in the refrigeration / air conditioning heat exchanger 3, so that the condensing pressure is reduced and the high-pressure side pressure of the refrigeration compressor 21 is increased. Go down. For this reason, the pressure ratio of the refrigeration compressor 21 may be lowered below a specified value, which may hinder the differential pressure lubrication inside the compressor. Therefore, in this embodiment, the specified pressure ratio is ensured by performing a throttling operation so that the condensing pressure adjusting valve 23 in the refrigerant circuit 102 for refrigeration does not reach a condensing pressure below a certain level.

  When the air conditioning side stops the heating operation, the refrigerant refrigerant circuit 102 is operated alone, and the blower 40 is sent from the controller 200 based on the value of the condensation pressure detected by the freezing pressure sensor 32 as in the air conditioning cooling operation. The output of the rotation speed is controlled.

  As shown in FIG. 2, the heat transfer pipe 3a of the air conditioning path and the heat transfer pipe 3b of the freezing path of the heat exchanger 3 for the refrigerating and air conditioning system are all connected to the upstream side of the air flow generated by the blower 40. A part of the heat transfer tube 3b of the air conditioning path is arranged on the upstream side of the air flow, and the rest is positioned on the downstream side of the air flow, like the heat transfer tube 3b of the refrigeration path. During the heating operation, the air-conditioning refrigerant depressurized by the expansion valve 13 exchanges heat with the outdoor air sent by the blower 40 in the refrigeration air-conditioning heat exchanger 3 and is condensed and evaporated. However, the arrangement shown in FIG. As a result, part of the heat of condensation in the refrigeration path increases the inlet air temperature of the air conditioning path, and this temperature rise increases the amount of heat absorbed in the heat transfer pipe of the air conditioning path. This leads to an increase in the heating capacity of the refrigerant circuit 101.

  According to this embodiment, the air-conditioning heat transfer tube 3a and the refrigeration heat transfer tube 3b are integrally formed via the heat transfer fin 3c to constitute the refrigeration air-conditioning heat exchanger 3, and the air-conditioning heat transfer tube 3a is condensed. When the cooling operation is performed as the air conditioner, the controller 200 is provided to control the rotational speed of the blower 40 based on the higher condensing pressure of the air conditioning refrigerant circuit 101 or the refrigeration refrigerant circuit 102. A refrigerating and air-conditioning apparatus 100 can be obtained that can appropriately operate the air-conditioning refrigerant circuit 101 and the refrigerating refrigerant circuit 102 while downsizing the entire apparatus.

  Further, when the refrigerant used for the air-conditioning refrigerant circuit 101 and the refrigerant used for the refrigeration refrigerant circuit 102 are of different types, the controller 200 performs the cooling operation of the air-conditioning heat transfer tube 3a as a condenser. Then, the higher condensing pressure of the air conditioning refrigerant circuit 101 and the refrigeration refrigerant circuit 102 is corrected based on the physical properties of the lower refrigerant, and the corrected condensing pressure and the condensing pressure of the other refrigerant circuit are calculated. Since the rotational speed of the blower 40 is controlled based on the higher condensing pressure in comparison, an appropriate refrigerant is used for each of the air conditioning refrigerant circuit 101 and the refrigeration refrigerant circuit 102 to perform air conditioning. The refrigerant circuit 101 and the refrigeration refrigerant circuit 102 can be appropriately operated.

  In addition, the controller 200 controls the rotation speed of the blower 40 based on the evaporation pressure of the air conditioning refrigerant circuit 101 when the air conditioning heat transfer tube 3a is operated for heating as an evaporator. The air volume is increased in accordance with the decrease in the outside air temperature so as to suppress the decrease in the evaporation temperature, and the necessary air conditioning heating capacity can be ensured in the winter season when the heating load is larger than the refrigeration load.

  In addition, since the air conditioning heat transfer tube 3a is provided with a condensing pressure adjusting device that adjusts the condensing pressure of the refrigeration refrigerant circuit 102 when the heating operation is performed as an evaporator, in the winter season when the heating load is larger than the refrigeration load. Refrigeration condensing pressure decreases because the air volume is larger than the required air volume on the refrigeration side while ensuring the necessary air conditioning and heating capacity, and the pressure ratio falls below the specified value, which hinders the differential pressure lubrication inside the compressor. Therefore, stable operation on the refrigeration side that is hardly affected by the air volume on the air conditioning side can be secured.

  The refrigerating and air-conditioning heat exchanger 3 is arranged such that the heat transfer tubes form a plurality of rows with respect to the flow direction of the air that flows in by driving the blower 40, and belongs to the refrigerant circuit for refrigeration 102. Since 3b is positioned in a row on the upstream side with respect to the air flow, a part of the heat of condensation in the heat transfer pipe 3b belonging to the refrigerant circuit for refrigeration 102 is the inlet air of the heat exchanger portion for air conditioning. The temperature is increased, and during the heating operation of the air conditioning, this temperature rise acts as an amount of heat absorbed into the heat transfer pipe 3a for air conditioning that is an evaporator, leading to an improvement in heating capacity. Moreover, since the amount of frost formation of the heat exchanger 3 for refrigeration air conditioning decreases from the time of a normal driving | operation, it can anticipate improving the fall of an air-conditioning heating capability.

It is a block diagram of the refrigeration air conditioner of one Example of this invention. It is a model figure showing the form of the path | pass arrangement | sequence of the heat exchanger tube of the refrigeration air-conditioning heat exchanger of FIG. It is an operation | movement flowchart at the time of air_conditionaing | cooling operation in the case where the refrigerant | coolant for an air conditioning of the refrigeration air conditioning apparatus of FIG. It is an operation | movement flowchart at the time of air_conditionaing | cooling operation in the case where the refrigerant | coolant for air conditioning and the refrigerant | coolant for freezing of the refrigeration air conditioning apparatus of FIG. 1 differ.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Air-conditioning compressor, 2 ... Air-conditioning compressor, 3 ... Refrigeration air-conditioning heat exchanger, 3a ... Air-conditioning heat transfer tube, 3b ... Refrigeration heat-transfer tube, 3c ... Heat-transfer fin, 4 ... Liquid receiver, 5 ... oil separator, 6 ... accumulator, 7 ... silencer, 8 ... subcooler for air conditioning, 9 ... check valve, 10 ... check valve, 11 ... oil return circuit, 12 ... four-way valve, 13 ... outdoor expansion valve, 14 ... blocking Valves 15, blocking valves 16, pressure sensors for air conditioning, 17 pressure sensors for air conditioning, 21 compressors for refrigeration, 22 check valves, 23, condensing pressure adjusting valve (condensing pressure adjusting device), 24, receiving Liquid unit, 25 ... Subcooler for freezing, 26 ... Accumulator, 27 ... Stop valve, 28 ... Dryer, 29 ... Sight glass, 30 ... Stop valve, 31 ... Liquid bypass circuit, 32 ... Pressure sensor for freezing, 33 ... Pressure for freezing Sensor, 40 ... Blower, 51 ... Heat for indoor air conditioning Exchanger, 52 ... indoor air conditioning expansion valve, 53 ... indoor air conditioning blower, 61 ... indoor refrigeration heat exchanger, 62 ... indoor refrigeration expansion valve, 63 ... indoor refrigeration blower, 100 ... refrigeration air conditioner, 101 ... Refrigeration circuit for air conditioning, 102 ... Refrigeration refrigerant circuit, 110 ... Outdoor unit, 120 ... Indoor unit for air conditioning, 130 ... Indoor unit for refrigeration, 140 ... Building, 200 ... Controller (control device).

Claims (7)

An air-conditioning refrigerant circuit having an air-conditioning heat transfer tube that becomes a condenser during cooling operation and an evaporator during heating operation constitutes an air-conditioning refrigeration cycle,
Construct a refrigeration cycle for refrigeration with a refrigeration refrigerant circuit having a heat transfer tube for refrigeration that serves as a condenser,
The air conditioning heat transfer tube and the refrigeration heat transfer tube are integrally formed through a heat transfer fin to constitute a refrigeration air conditioning heat exchanger,
In a refrigeration air conditioner comprising a blower that ventilates the refrigeration air conditioning heat exchanger,
A controller that controls the rotational speed of the blower based on the higher condensing pressure of the air conditioning refrigerant circuit or the refrigeration refrigerant circuit when the air conditioning heat transfer tube is cooled as a condenser; Prepared ,
When the refrigerant used for the air conditioning refrigerant circuit and the refrigerant used for the refrigeration refrigerant circuit are of different types, the control device is configured to perform cooling operation of the air conditioning heat transfer tube as a condenser. The refrigerant condensing pressure used in the air conditioning refrigerant circuit was corrected and converted to correspond to the air conditioning refrigerant condensing pressure based on the physical property value of the refrigerant used in the refrigeration refrigerant circuit corresponding to the same saturation temperature. The refrigeration is characterized in that a condensation pressure is obtained, the corrected condensation pressure is compared with the condensation pressure of the refrigeration refrigerant circuit, and the rotational speed of the blower is controlled based on the higher condensation pressure. Air conditioner. An air-conditioning refrigerant circuit having an air-conditioning heat transfer tube that becomes a condenser during cooling operation and an evaporator during heating operation constitutes an air-conditioning refrigeration cycle,
Construct a refrigeration cycle for refrigeration with a refrigeration refrigerant circuit having a heat transfer tube for refrigeration that serves as a condenser,
The air conditioning heat transfer tube and the refrigeration heat transfer tube are integrally formed through a heat transfer fin to constitute a refrigeration air conditioning heat exchanger,
In a refrigeration air conditioner comprising a blower that ventilates the refrigeration air conditioning heat exchanger,
A controller that controls the rotational speed of the blower based on the higher condensing pressure of the air conditioning refrigerant circuit or the refrigeration refrigerant circuit when the air conditioning heat transfer tube is cooled as a condenser; Prepared,
The said control apparatus controls the rotation speed of the said air blower based on the evaporation pressure of the said refrigerant circuit for an air conditioning, when the said heat exchanger tube for air conditioning is heating-operated as an evaporator, The refrigerating air conditioner characterized by the above-mentioned. The refrigerating and air-conditioning apparatus according to claim 2 , further comprising a condensing pressure adjusting device that adjusts a condensing pressure of the refrigerating refrigerant circuit when the air-conditioning heat transfer tube is heated as an evaporator. Air conditioner. 4. The refrigeration air conditioner according to claim 3, wherein the condensing pressure adjusting device comprises a condensing pressure adjusting valve, the condensing pressure adjusting valve is provided in the refrigeration refrigerant circuit, and the air conditioning heat transfer tube is an evaporator. A refrigerating and air-conditioning apparatus that performs a throttling operation so that the condensing pressure of the refrigerant circuit for refrigeration becomes equal to or higher than a predetermined pressure when heating operation is performed . The refrigerating and air conditioning apparatus according to any one of claims 2 to 4 , wherein the refrigerating and air conditioning heat exchanger has a plurality of rows of heat transfer tubes with respect to a flow direction of air flowing in by driving of the blower. The refrigerating and air-conditioning apparatus is characterized by being arranged so that the heat transfer tubes belonging to the refrigerant circuit for refrigeration are positioned in a row upstream of the air flow . An air conditioning refrigerant circuit having an air conditioning heat transfer tube that becomes a condenser during cooling operation and an evaporator during heating operation constitutes an air conditioning refrigeration cycle,
Constructing a refrigeration cycle for refrigeration with a refrigeration refrigerant circuit having a refrigeration heat transfer tube as a condenser,
The air conditioning heat transfer tube and the refrigeration heat transfer tube are integrally formed through a heat transfer fin to constitute a refrigeration air conditioning heat exchanger,
In a refrigeration air conditioner comprising a blower that ventilates the refrigeration air conditioning heat exchanger,
When the air-conditioning heat transfer tube is heated as an evaporator, a control device is provided that controls the rotational speed of the blower based on the evaporation pressure of the air-conditioning refrigerant circuit,
A refrigerating and air-conditioning apparatus comprising: a condensing pressure adjusting device that adjusts a condensing pressure of the refrigerating refrigerant circuit when the air-conditioning heat transfer tube is heated as an evaporator . The refrigerating and air conditioning apparatus according to claim 6, wherein the refrigerating and air conditioning heat exchanger is arranged such that heat transfer tubes form a plurality of rows with respect to a flow direction of air flowing in by driving of the blower. A refrigerating and air-conditioning apparatus, wherein the heat transfer tubes belonging to the refrigerant circuit for refrigeration are arranged in a row upstream of the air flow .

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