KR100505229B1 - The apparatus of oil balance control for 2 compressor type heat pump - Google Patents

Abstract

The present invention is a conventional double compressor type heat pump has a problem that the oil level of the inverter compressor is changed according to the operating conditions, the mechanical part of the compressor is worn or the capacity decrease due to oil compression occurs,

A first oil separator for separating oil from refrigerant from the inverter compressor, a second oil separator for separating oil from the refrigerant from the constant speed compressor, and oil separated by the first oil separator and the second oil separator A header, a first oil supply unit for supplying oil of the header to the inverter compressor, and a second oil supply unit for supplying oil of the header to the constant speed compressor,

Since the oil does not circulate the refrigerant cycle to supply the compressor with a sufficient amount of oil, the wear of the compressor machinery is not caused due to lack of lubrication and the oil is not excessively introduced into the compressor, thereby reducing the refrigerant compression capacity due to the oil compression. It is related to the homogenizer of the double compressor type heat pump to prevent the.

Description

The apparatus of oil balance control for 2 compressor type heat pump}

The present invention relates to a heat pump that allows cooling and heating to be performed as a single device by changing the flow direction of the refrigerant through a switch of the switch, and in particular, recovers oil from the steam from the compressor and supplies it back to the compressor. The present invention relates to a double compressor type milking device which prevents the wear of the compressor machinery part due to the lack of oil and prevents the deterioration of the capacity due to the excessive inflow of oil.

In general, the heat pump is an air conditioner that can be switched to cooling and heating as necessary, and a compressor (1) for changing a low-temperature low-pressure gaseous refrigerant to high temperature and high pressure, as shown in FIG. (1) the cooling and cooling switching valve (2) which sends the refrigerant from the outdoor heat exchanger (3) when cooling to the indoor heat exchanger (5) when heating, and condensing means for condensing the gas refrigerant of high temperature and high pressure with liquid refrigerant ( An outdoor heat exchanger (3) for cooling, an indoor heat exchanger (5) for heating, and an expansion mechanism (4) for expanding the liquid refrigerant condensed by the condensation means into a low-temperature, low-pressure two-phase refrigerant mixed with a solid and a liquid; And evaporation means (indoor heat exchanger (5) for cooling, outdoor heat exchanger (3) for heating) and side surfaces of the outdoor heat exchanger (3) for absorbing external heat to change the two-phase refrigerant into a gas state. Installed to blow air to the heat exchanger Is composed of the outdoor fan 7 and the indoor fan (6) (108) installed in the indoor heat exchanger 5, a difference between the updated air discharge or hot through a heat exchanger into a room for increasing a rate.

The conventional heat pump configured as described above is configured to perform heating or cooling by discharging warm air or cool air to the room according to the operation of the air conditioning switching valve.

At the time of cooling, the cooling / heating switching valve 2 is operated in the cooling mode so that the refrigerant generated in the compressor 1 flows to the outdoor heat exchanger 3 side. When the heat pump is driven, the compressor 1 is operated to change the refrigerant in the gas state of low temperature and low pressure into high temperature and high pressure. The refrigerant from the compressor (1) flows to the outdoor heat exchanger (3) by the air-conditioning switching valve (2), and in the outdoor heat exchanger (3), the refrigerant in the gas state is changed into the liquid refrigerant in the heat state. . At this time, the outdoor fan 7 installed on the side of the outdoor heat exchanger 3 blows air to the heat exchanger side so that heat of the refrigerant is quickly released.

Since the refrigerant that has passed through the outdoor heat exchanger 3 into a liquid state of high temperature and high pressure expands through the expansion mechanism 4, the refrigerant that has passed through the expansion mechanism evaporates a portion of the refrigerant to form a low temperature low pressure mixture of liquid and gas. It becomes two phase form. The refrigerant of the two-phase type is moved to the indoor heat exchanger (5) and then changed into a gas state through heat exchange. In the indoor heat exchanger (5), a two-phase refrigerant vaporizes to absorb outside heat to cool the air, and the cooled air is discharged into the room by the indoor fan (6) to cool the room. The refrigerant in the low-temperature, low-pressure gaseous state generated through heat exchange is moved to the compressor (1) and continues to be recycled.

When heating, the air-conditioning switching valve 2 is operated in a heating mode. That is, the refrigerant of high temperature and high pressure generated in the compressor 1 flows toward the indoor heat exchanger 5 so that the flow direction of the refrigerant proceeds to a cycle opposite to the above-described cooling cycle.

When the heat pump is driven, the compressor 1 is operated to change the refrigerant in the gas state of low temperature and low pressure into high temperature and high pressure. The refrigerant from the compressor (1) flows to the indoor heat exchanger (5) by the air-conditioning switching valve (2), and in the indoor heat exchanger (5), the refrigerant in the gaseous state is changed to the liquid refrigerant in the heat state. . At this time, the air warmed by the heat radiation action of the refrigerant is discharged into the room by the indoor fan 6 to heat the room.

Since the refrigerant that has passed through the indoor heat exchanger 5 and becomes a liquid at high temperature and high pressure expands through the expansion mechanism 4, the refrigerant that has passed through the expansion mechanism 4 vaporizes a part thereof to mix liquid and gas. It becomes the two-phase form of low temperature low pressure. The refrigerant of the two-phase type is moved to the outdoor heat exchanger (3) and then changed into a gas state through heat exchange. At this time, the outdoor fan 7 blows air toward the heat exchanger to facilitate heat exchange. The refrigerant in the low-temperature, low-pressure gaseous state generated through heat exchange in the outdoor heat exchanger (3) is moved to the compressor (1) and continues to be recycled.

However, the heat pump may install a plurality of indoor heat exchangers for one outdoor heat exchanger, and for this purpose, the capacity of the compressor is variable. The compressor used at this time is an inverter compressor, and the inverter compressor is configured to change its capacity by changing the operating frequency. In particular, a large number of indoor heat exchangers may cause a case where one inverter compressor cannot handle its capacity. In this case, an inverter compressor and a constant speed compressor are used simultaneously, and a heat pump of this type is a double compressor type. Heat pump.

The conventional double compressor type heat pump has an outdoor heat exchanger 16 which acts as a condensation means for cooling and an evaporation means for heating, and an evaporation means for cooling and heats when heating. Compressing the refrigerant from the accumulator 17 and the accumulator 17 temporarily storing the refrigerant from the outdoor heat exchanger 16 or the indoor heat exchanger and acting as a condensation means An inverter compressor 11 whose capacity varies according to frequency, a constant speed compressor 12 installed in parallel with the inverter compressor 11 to compress refrigerant from the accumulator 17, and the inverter compressor 11 Alternatively, the refrigerant from the constant speed compressor 12 is supplied to the outdoor heat exchanger 16 for cooling, and to the indoor heat exchanger for heating, and to the indoor heat exchanger for cooling. The heating / cooling switching valve 15 for supplying the refrigerant from the outdoor heat exchanger 16 to the accumulator 17 and supplying the refrigerant from the outdoor heat exchanger 16 to the accumulator 17, and the inverter compressor 11 and the constant speed. It is provided between the compressor 12 and the air-conditioning switching valve 15, respectively, and includes a check valve 13, 14 to prevent the refrigerant flow back to the compressor (11) (12).

Since the flow of the refrigerant cycle related to cooling or heating during operation of the conventional double compressor type heat pump configured as described above is the same as a general heat pump, description thereof will be omitted and operation of the inverter compressor and the constant speed compressor according to the present invention. Only the description will be given.

The refrigerant is compressed while the operating frequency of the inverter compressor 11 is varied so that the amount of refrigerant compressed in accordance with the operating number of the indoor heat exchanger, that is, the operating load, is changed. At this time, when the operating load is large and exceeds the maximum operating frequency of the inverter compressor 11, the constant speed compressor 12 is operated to compress the refrigerant and at the same time the operating frequency of the inverter compressor 11 is lowered to adjust the overall capacity. . Of course, when the operation load decreases, the constant speed compressor 12 is stopped and only the inverter compressor 10 is operated, and the capacity of the inverter compressor 11 is changed to correspond to the load of the indoor heat exchanger.

At this time, the oil in the lower part of each compressor (11, 12) is pumped to the upper mechanical part to lubricate the mechanical part, a part of which is mixed with the refrigerant to circulate the refrigerant cycle, the suction of the compressor (11) 12 Through the reflow is introduced into the compressor (11) (12). Therefore, the oil level is changed according to the operating conditions of the respective compressors 11 and 12, which adversely affects the durability of the compressors 11 and 12 or causes the capacity to be reduced.

That is, when the load of the indoor heat exchanger is large and the constant speed compressor 12 is operated and the inverter compressor 11 is operated at a low speed, the oil level of the inverter compressor 11 is lowered. As a result, the lubrication of the mechanical part is reduced. Not enough, the wear progresses and also restrains the inverter compressor (11). In addition, when the load of the indoor heat exchanger is not large and the constant speed compressor 12 is stopped and only the inverter compressor 11 is operated at high speed, the oil level of the inverter compressor 11 becomes excessively high, which is caused by oil compression. The problem of decreased ability will be presented.

In other words, the conventional double compressor type heat pump has a problem in that the oil level of the inverter compressor is changed according to operating conditions so that the mechanical part of the compressor is worn out or the capacity decrease due to oil compression occurs.

The present invention has been made to solve the above-described problems of the prior art, the oil of the compressor is prevented from circulating along the refrigerant cycle and the oil level of the compressor by lowering the oil by the lack of oil by preventing the excessive rise or fall of the machine part wear It is an object of the present invention to provide a homogenizing device of a double compressor type heat pump that can prevent the loss of oil and reduce the capacity caused by the excessive inflow of oil.

The present invention for solving the above technical problem is a first oil separator for separating the oil from the refrigerant from the inverter compressor, a second oil separator for separating the oil from the refrigerant from the constant speed compressor, the first oil separator and the first A second oil supply unit for supplying the oil separated by the two oil separators, a first oil supply unit supplying the oil of the header to the inverter compressor, and a second oil supply unit supplying the oil of the header to the constant speed compressor, Each of the first oil supply unit and the second oil supply unit includes an oil supply line connected to a refrigerant line, one end of which is connected to the header and the other end of which supplies a refrigerant to the inverter compressor or the constant speed compressor; Capillaries provided in each of the oil supply lines to block discharge gas compressed in the inverter compressor or the constant speed compressor from being mixed with oil and reintroduced into the inverter compressor or the constant speed compressor; It is characterized in that it comprises a solenoid valve which is installed at each rear end of the capillary tube to block the excessive flow of oil into the inverter compressor or constant speed compressor.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 3, the homogenizer of the double compressor type heat pump according to the present invention includes a first oil separator 51 for separating oil from a refrigerant from the inverter compressor 61 and a refrigerant from the constant speed compressor 62. A second oil separator 52 for separating oil from the oil, a header 53 for collecting oil separated by the first oil separator and a second oil separator, and a second oil separator for supplying oil of the header to the inverter compressor. And an oil supply part for supplying oil of the header to the constant speed compressor.

Here, the first oil separator and the second oil separator are installed between the check valves 63 and 64 and the outlets of the compressors 61 and 62 to prevent backflow of the refrigerant. The first oil supply unit and the second oil supply unit, one end is connected to the header and the other end is an oil supply pipe line 54, 54 'connected to a refrigerant pipe for supplying refrigerant to the inverter compressor or constant speed compressor, and the oil supply pipe Capillaries 55 and 55 'installed in the furnaces 54 and 54' to prevent the compressed discharge gas from being mixed with oil by the compressor and being excessively re-introduced, and the capillaries 55 and 55 ' It is installed at the rear end and consists of solenoid valves 56 and 56 'that prevent oil from excessively flowing into the compressor.

At this time, the solenoid valve is on / off according to the oil level of the compressor, for this purpose is provided with a solenoid valve control means (not shown). The solenoid valve control means includes a solenoid drive unit for turning on / off the solenoid valve, a oil level detection unit for detecting an oil level of a compressor, and a solenoid drive unit in accordance with a detection signal of the oil level detection unit, as in a normal control unit. It consists of a control unit for sending.

Reference numeral 66 is an outdoor heat exchanger that acts as a condensation means when cooling and an evaporation means when heating, and 67 is an accumulator in which refrigerant from the outdoor heat exchanger 66 or an indoor heat exchanger (not shown) is temporarily stored. to be.

The homogenizer of the double compressor type heat pump of the present invention configured as described above prevents oil from the compressor from being circulated along the refrigerant cycle, thereby increasing the amount of oil supplied to the compressor and simultaneously introducing excessive oil into the compressor. This prevents the loss of capacity due to oil compression.

The refrigerant from the inverter compressor (61) is separated from the oil in the first oil separator (51) and then circulates along the refrigerant cycle after passing through the check valve (63) and the air conditioning valve (65), and the constant speed compressor (62). The refrigerant from the oil is separated from the oil in the second oil separator 52 and then circulates along the refrigerant cycle after passing through the check valve 64 and the air conditioning switch valve (65). Of course, the constant speed compressor 62 is operated only when the load of the indoor heat exchanger exceeds the capacity of the inverter compressor 61, otherwise, only the inverter compressor 61 changes the operating frequency according to the load of the indoor heat exchanger. The operation while varying is the same as in the prior art.

Oil separated from the refrigerant in the first oil separator (51) and the second oil separator (52) is collected in the header (53), and the oil in the header (53) is an inverter compressor (61) or a constant speed compressor (62). Depending on whether the operation of the first oil supply or the second oil supply through the inverter compressor 61 or the constant speed compressor 62 is supplied. At this time, the oil of the header 53 is mixed with the refrigerant supplied from the accumulator 67 through the oil supply pipes 54 and 54 'of the first oil supply part or the second oil supply part to the compressors 61 and 62. Capillary tubes 55 and 55 'installed in the oil supply lines 54 and 54' are separated in a state in which compressed discharge gas is mixed with oil and collected in the header 53, and then the compressor 61 ( 62) to prevent a reduction in compression capacity.

In addition, the solenoid valves 56 and 56 ′ provided at the rear ends of the capillaries 55 and 55 ′ are turned on and off in accordance with the oil levels of the compressors 61 and 62 to be inside the compressors 61 and 62. To prevent excess oil from entering. That is, the control unit sends a valve driving signal to the solenoid drive unit in accordance with a detection signal sent by the oil level detecting unit detecting the oil level of the compressor 61 and 62 to detect the oil level of the oil, thereby turning on the solenoid valves 56 and 56 '. Turned on / off. Therefore, when the oil level is too high, the solenoid valves 56 and 56 'are turned off to block no further oil from being supplied to the compressors 61 and 62, so that the oil level of the compressors 61 and 62 is reduced. It will not rise excessively. As a result, a decrease in the refrigerant compression capacity due to oil compression does not occur.

As such, the oil pumping device of the double compressor type heat pump of the present invention prevents oil from circulating the refrigerant cycle, thereby supplying a sufficient amount of oil to the compressor. There is an advantage that can not be excessively introduced to prevent the reduction of the refrigerant compression capacity due to the oil compression.

1 is a configuration diagram schematically showing a structure of a general heat pump;

Figure 2 is a schematic view showing a conventional double compressor type heat pump,

3 is a block diagram showing a homogenizer of the double compressor type heat pump according to the present invention.

<Explanation of symbols on main parts of the drawings>

51: first oil separator 52: second oil separator

53: header 54,54 ': oil supply line

55,55 ': capillary 56,56': solenoid valve

61: inverter compressor 62: constant speed compressor

63,64: check valve 65: air conditioning switch

66: outdoor heat exchanger 67: accumulator

Claims (6)

 A first oil separator for separating oil from refrigerant from the inverter compressor, a second oil separator for separating oil from the refrigerant from the constant speed compressor, and oil separated by the first oil separator and the second oil separator A header, a first oil supply unit for supplying oil of the header to the inverter compressor, and a second oil supply unit for supplying oil of the header to the constant speed compressor, Each of the first oil supply unit and the second oil supply unit includes an oil supply line connected to a refrigerant line, one end of which is connected to the header and the other end of which supplies a refrigerant to the inverter compressor or the constant speed compressor; Capillaries provided in each of the oil supply lines to block discharge gas compressed in the inverter compressor or the constant speed compressor from being mixed with oil and reintroduced into the inverter compressor or the constant speed compressor;  And a solenoid valve installed at each rear end of the capillary tube to block oil from being excessively introduced into the inverter compressor or the constant speed compressor. The method of claim 1, The first oil separator and the second oil separator is a homogenizer of the double compressor type heat pump, characterized in that installed between the check valve and the outlet of the compressor to prevent the back flow of the refrigerant. delete delete The method of claim 1, And the first oil supply unit and the second oil supply unit include solenoid valve control means for operating the solenoid valve according to the oil level of the compressor. The method of claim 5, The solenoid valve control means comprises a solenoid driving unit for turning on / off the solenoid valve, a oil level detecting unit for detecting an oil level of a compressor, and a control unit for transmitting a valve driving signal to the solenoid driving unit according to a detection signal of the oil level detecting unit. A homogenizer for a double compressor type heat pump.