JP2007113542A - Hermetic two-stage rotary compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To fasten a low stage compression element with a high stage compression element with a simple structure to largely reduce a cost while shortening an intermediate communication passage, in a hermetic two-stage rotary compressor. <P>SOLUTION: The hermetic two-stage rotary compressor 1 has the low stage compression element 20a and high stage compression element 20b driven by a crankshaft 2. The crankshaft 2 has a low-stage eccentric part 5a, and a high-stage eccentric part 5b different in phase by 180 degrees from the low-stage eccentric part 5a. A low-stage end plate 19b, a low-stage cylinder 10a, a partition plate 15, a high-stage cylinder 10b, and a high-stage end plate 9a are integrally fastened through bolts 36, with a state where they are stacked in this order and plane angle positions of a vane groove of the low-stage cylinder 10a and a vane groove of the high-stage cylinder 10b are the same. An intermediate discharge space 33 in which gas of intermediate pressure is discharged communicates with a suction port 25 of a high-stage compression chamber 23b through the intermediate communication passage 30 passing through the low-stage end plate 19b, low-stage cylinder 10a, partition plate 15, and high-stage cylinder 10b. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a hermetic two-stage rotary compressor having a low-stage compressor section and a high-stage compressor section in a compression mechanism section, and in particular, a hermetically-sealed type 2 used for a refrigerator such as an air conditioner or a cold-applied product. It is suitable for a stage rotary compressor.

  An example of a hermetic two-stage rotary compressor is disclosed in Japanese Patent Laid-Open No. 63-138189 (Patent Document 1). This hermetically sealed two-stage rotary compressor has an intermediate communication path that guides gas exiting the compression chamber of the low-stage compressor section to the compression chamber of the high-stage compressor section to the outside of the sealed container, and a buffer container in the middle And the volume of the intermediate communication passage is set larger than the displacement volume of the compression chamber of the high-stage compressor section.

  However, in the hermetic two-stage rotary compressor of Patent Document 1, since the communication passage is configured by a passage between the inside of the compressor and the outside of the compressor, the intermediate communication passage becomes extremely long. The followability when the gas in the passage is introduced into the high-stage compressor section is deteriorated, causing pressure pulsation in the intermediate communication passage, and there is a problem that the effect of suppressing sufficient pressure pulsation cannot be obtained.

  As a hermetic two-stage rotary compressor that solves this problem, the one disclosed in Japanese Patent Laid-Open No. 2003-148366 (Patent Document 2) has been proposed. This hermetic two-stage rotary compressor has a structure in which a gas refrigerant is supplied from a low-stage compressor section to a high-stage compressor section, and the intake and compression start crank angles are set to a low-stage compressor section and a high-stage compressor section. In order to shorten the intermediate communication path from the low-stage compressor section to the high-stage compressor section, the plane arrangement angle between the low-stage compressor section and the high-stage compressor section is shifted and the low-stage compression is performed. An intermediate communication path is configured by a communication hole that passes through the machine section and the high-stage compressor section.

JP-A-63-138189 JP 2003-148366 A

  However, in the hermetic two-stage rotary compressor of Patent Document 2, the plane arrangement angle between the low-stage compressor section and the high-stage compressor section is shifted, so the low-stage compressor section and the high-stage compressor section The tightening screw hole pitch for fastening with the low-stage compressor section and the high-stage compressor section had to be set individually, and there was a problem that the cost would increase due to the complicated structure .

  An object of the present invention is to provide a hermetically sealed two-stage structure that enables a low-stage compressor section and a high-stage compressor section to be fastened with a simple structure while shortening the intermediate communication path, and can greatly reduce the cost. It is to provide a rotary compressor.

  In order to achieve the above-described object, the present invention includes an electric motor, a crankshaft driven by the electric motor, a low-stage compressor section and a high-stage compressor section driven by the crankshaft, in a sealed container. The crankshaft has a low-stage eccentric part and a high-stage eccentric part whose phase is 180 ° different from the low-stage eccentric part, and the low-stage compressor part Is a low-stage cylinder, a low-stage roller disposed in the low-stage cylinder and driven to rotate by the low-stage eccentric part, a partition plate sandwiched between the low-stage cylinder and the high-stage cylinder, A low stage end plate disposed on the side opposite to the partition plate of the low stage cylinder, and a low stage extending in a radial direction from the outer periphery of the low stage roller and slidably fitted in a vane groove of the low stage cylinder And a high-stage compressor formed with a low-stage compression chamber composed of a vane Are arranged on the high-stage cylinder, the high-stage roller disposed in the high-stage cylinder and driven to rotate by the high-stage eccentric portion, the partition plate, and the anti-partition plate side of the high-stage cylinder. A high-stage compression chamber is formed that includes a high-stage end plate and a high-stage vane that extends radially from the outer periphery of the high-stage roller and is slidably fitted into the vane groove of the high-stage cylinder. A hermetically sealed two-stage rotary compressor, wherein the low-stage end plate, the low-stage cylinder, the partition plate, the high-stage cylinder, and the high-stage end plate are stacked in this order and the vanes of the low-stage cylinder An intermediate discharge space in which the intermediate pressure space is discharged from the low-stage compression chamber and the high-stage compression is integrally fastened through a bolt with the planar angular position of the groove and the vane groove of the high-stage cylinder being the same. A suction port of the chamber, the low-stage end plate, The low-stage cylinder, the partition plate, and the high-stage cylinder communicate with each other via an intermediate communication path.

A more preferable specific configuration example of the present invention is as follows.
(1) The low-stage cylinder includes a suction port that opens in the vicinity of the low-stage vane in the low-stage compression chamber, and a suction passage that guides the working fluid from the side surface of the low-stage cylinder to the suction port. The intermediate communication passage extends from the suction passage of the low-stage cylinder on the vane side, and includes a hole formed in the low-stage end plate, the low-stage cylinder, the partition plate, and the high-stage cylinder. That.
(2) The high-stage cylinder is formed in a suction port that is located on the side opposite to the vane side from the suction port of the low-stage cylinder and opens to the high-stage compression chamber, and in a region that extends from the suction port to the vane side. It has a chamber expansion part.
(3) The low-stage cylinder has a suction port that opens near the low-stage vane in the low-stage compression chamber, and a suction passage that guides the working fluid from the side surface of the low-stage cylinder to the suction port. The intermediate communication path includes an intermediate flow path connecting pipe that extends through the suction path of the low-stage cylinder.

  According to the present invention, a hermetic two-stage system that enables a low-stage compressor section and a high-stage compressor section to be fastened with a simple structure while shortening the intermediate communication path and can achieve a significant cost reduction. A rotary compressor can be provided.

Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. The same reference numerals in the drawings of the respective embodiments indicate the same or equivalent.
(First embodiment)
A hermetic two-stage rotary compressor according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a longitudinal sectional view of a hermetic two-stage rotary compressor according to the first embodiment, and FIG. 2 shows the low-stage compressor section and the high-stage compressor section of the compression mechanism section according to the first embodiment arranged side by side in a plane. FIG. 3 is a schematic view, FIG. 3 is a cross-sectional view taken along line XX in FIG. 1, and FIG. 4 is a cross-sectional view taken along line YY in FIG. FIG. 1 is a ZZ cross-sectional view of FIG.

  As shown in FIG. 1, the hermetic two-stage rotary compressor 1 includes a hermetic container 13 including a bottom portion 21, a lid portion 12, and a body portion 22. An electric motor 14 having a stator 7 and a rotor 8 is provided at the upper part in the sealed container 13. The outer periphery of the stator 7 is fixed to the hermetic container 13, and the rotor 8 is fixed to the outer periphery of the upper portion of the crankshaft 2 and is rotatably disposed in the stator 7. When the stator 7 is energized, the rotor 8 is rotated, and the crankshaft 2 is driven and rotated accordingly. A compression mechanism unit including a low-stage compressor unit 20a and a high-stage compressor unit 20b is provided in the lower part of the hermetic container 13. The low-stage compressor unit 20a and the high-stage compressor unit 20b are driven by the crankshaft 2, and compress the gas refrigerant that is the working fluid.

  The crankshaft 2 connected to the electric motor 14 includes an eccentric portion composed of two eccentric portions 5a and 5b, and is supported by the main bearing 9 and the sub bearing 19a. The eccentric part 5a constitutes a low stage eccentric part, and the eccentric part 5b constitutes a high stage eccentric part. The main bearing 9 is installed above the high stage eccentric part 5a, and the sub bearing 19a is installed below the low stage eccentric part 5b.

  The low-stage compressor unit 20a includes a low-stage cylinder 10a, a low-stage roller 11a disposed in the low-stage cylinder 10a and driven to rotate by the low-stage eccentric part 5a, and a low-stage cylinder 10a and a high-stage cylinder 10b. A partition plate 15 sandwiched therebetween, a low-stage end plate 19b disposed on the side opposite to the partition plate of the low-stage cylinder 10a, and a radial direction extending from the outer periphery of the low-stage roller 11a to the inside of the vane groove of the low-stage cylinder 10a And a low-stage compression chamber 23a composed of a low-stage vane 18a (see FIG. 2) slidably fitted thereto.

  A circular cylinder chamber is formed in the center of the low-stage cylinder 10a, and a suction port and a discharge port 42 are formed in a portion adjacent to the low-stage vane 18a on the inner peripheral surface forming the cylinder chamber. The suction port and the discharge port 42 are arranged on both sides of the low stage vane 18a. The outer periphery of both side portions of the low-stage cylinder 10 a is formed so as to coincide with the inner periphery of the sealed container 1. The center of the cylinder chamber of the low stage cylinder 10 a coincides with the rotation center 2 a of the crankshaft 2.

  The low-stage roller 11a is formed in a cylindrical shape having an outer diameter smaller than the diameter of the cylinder chamber of the low-stage cylinder 10a, and its outer peripheral surface slides on the inner peripheral surface of the low-stage cylinder 10a constituting the cylinder chamber. It is rotated. A low-stage compression chamber 23a is formed between the outer peripheral surface of the low-stage roller 11a and the inner peripheral surface constituting the cylinder chamber of the low-stage cylinder 10a.

  The partition plate 15 is shared by the low-stage compressor unit 20a and the high-stage compressor unit 20b.

  The low-stage vane 18a is formed separately from the low-stage roller 11a in a flat plate shape, and moves forward and backward while always in contact with the outer peripheral surface of the low-stage roller 11a that rotates eccentrically with the rotation of the low-stage eccentric part 5a. Further, an applying force is applied from the back by an urging force applying means such as a coil spring, and the low-stage compression chamber 23a is divided into a compression space and a suction space.

  As shown in FIGS. 1 and 4, the auxiliary bearing 19 a, the low stage end plate 19 b, and the outer wall portion 19 c constituting the intermediate container 19 are integrally formed of the same member. An intermediate discharge space 33 is configured by closing the lower surface opening of the concave space formed by the intermediate container 19 with a cover 35.

  A discharge port 26a communicating with the discharge port 42 of the low-stage compression chamber 23a is formed in the low-stage end plate 19b, and a discharge valve 28a that opens at a predetermined intermediate pressure Pm is installed on the discharge side of the discharge port 26a. . The gas refrigerant compressed in the low-stage compression chamber 23a is discharged from the discharge port 42 through the discharge port 26a, through the discharge valve 28a, and into the intermediate discharge space 33.

  As shown in FIGS. 1 and 3, the high-stage compressor unit 20b includes a high-stage cylinder 10b, a high-stage roller 11b disposed in the high-stage cylinder 10b and driven to rotate by the high-stage eccentric part 5b, and a partition. In the vane groove 41b (see FIG. 3) of the high stage cylinder 10b extending in the radial direction from the outer periphery of the plate 15, the high stage end plate 9a disposed on the side opposite to the partition plate of the high stage cylinder 10b, and the high stage roller 11b And a high-stage compression chamber 23b composed of a high-stage vane 18b that is slidably fitted in the cylinder.

  A circular cylinder chamber is formed in the center of the high-stage cylinder 10b, and a discharge port 43 is formed in a portion close to the high-stage vane 18b on the inner peripheral surface forming the cylinder chamber, and suction is performed in a remote portion. A port 25 is formed. The suction port 25 and the discharge port 43 are disposed on both sides of the high stage vane 18b. The outer periphery of both side portions of the high-stage cylinder 10 b is formed so as to coincide with the inner peripheral surface of the sealed container 1. The center of the cylinder chamber of the high stage cylinder 10b coincides with the rotation center 2a of the crankshaft 2. The cylinder chamber of the low-stage cylinder 10a and the cylinder chamber of the high-stage cylinder 10b have the same radial dimension and different dimensions in the height direction (axial direction). The height dimension of the cylinder chamber of the low stage cylinder 10a is larger than the height dimension of the cylinder chamber of the high stage cylinder 10b.

  The high stage roller 11b is formed in a cylindrical shape having an outer diameter smaller than the diameter of the cylinder chamber of the high stage cylinder 10b, and its outer peripheral surface slides on the inner peripheral surface of the high stage cylinder 10b constituting the cylinder chamber. It is rotated. A high-stage compression chamber 23b is formed between the outer peripheral surface of the high-stage roller 11b and the inner peripheral surface constituting the cylinder chamber of the high-stage cylinder 10b.

  The high-stage end plate 9 a is formed integrally with the main bearing 9. The high stage end plate 9a and the main bearing 9 are composed of the same member.

  The high-stage vane 18b is formed separately from the high-stage roller 11b in a flat plate shape, and is back so as to move forward and backward while always contacting the outer peripheral surface of the high-stage roller 11b that rotates eccentrically with the rotation of the eccentric part 5b. The applying force is applied by an urging force applying means such as a coil spring to divide the high-stage compression chamber 23b into a compression space and a suction space.

  A discharge port 26b communicating with the discharge port 43 of the high-stage compression chamber 23b is formed in the high-stage end plate 9a, and a discharge valve 28b that opens at a predetermined discharge pressure Pd is installed on the discharge side of the discharge port 26b. . The gas refrigerant compressed in the high-stage compression chamber 23b is discharged from the discharge port 43 through the discharge port 26b, through the discharge valve 28b, and into the sealed container 13. The outer periphery of both side portions of the high-stage end plate 9 a is formed and fixed so as to coincide with the inner periphery of the sealed container 1.

  The cover 35, the low-stage end plate 19b, the low-stage cylinder 10a, the partition plate 15, the high-stage cylinder 10b, and the high-stage end plate 9a are stacked in this order from the bottom, and the vane groove of the low-stage cylinder 10a The upper stage cylinder 10b is fastened together through bolts 36 from below the cover 35 with the same planar angular position (angular position in the rotational direction of the crankshaft 2) with the vane groove 41b of the high stage cylinder 10b. With this configuration, it is possible to share the tightening screw hole pitch between the low-stage compressor unit 20a and the high-stage compressor unit 20b, and to standardize the production of the cylinder parts and to tighten the screw holes and the tightening holes of the compression element parts constituting the compression mechanism part. It can be minimized, and a significant cost reduction can be realized. In the present embodiment, a plurality (four) of bolts 36 are provided at equal intervals in the rotation direction of the crankshaft 2.

  The intermediate discharge space 33 through which the intermediate-pressure gas refrigerant is discharged from the low-stage compression chamber 23a and the suction port 25 (see FIG. 3) of the high-stage compression chamber 23b include a low-stage end plate 19b, a low-stage cylinder 10a, and a partition plate. 15 and an intermediate communication passage 30 passing through the high-stage cylinder 10b. The intermediate communication path 30 includes a discharge port 26c formed in the low stage end plate 19b and a suction port 25b formed in the high stage cylinder 10b. In the present embodiment, the intermediate communication path 30 is configured by holes formed in the low-stage end plate 19b, the low-stage cylinder 10a, the partition plate 15, and the high-stage cylinder 10b. As a result, the intermediate communication passage 30 can be formed very easily.

  The low-stage eccentric portion 5a and the high-stage eccentric portion 5b have a phase difference of 180 °, and the phase difference in the compression process between the low-stage compressor portion 20a and the high-stage compressor portion 20b is 180 °. That is, the compression processes of the two compressor units 20a and 20b are in opposite phases.

  Next, the compression operation of the hermetic two-stage rotary compressor of this embodiment will be described with reference to FIGS. The arrows in FIGS. 1 and 2 indicate the flow of the gas refrigerant.

  The low-pressure Ps gas refrigerant supplied through the pipe 31 is sucked into the low-stage compression chamber 23a from the suction passage 25a connected to the pipe 31, and is compressed to the intermediate pressure Pm by the eccentric rotation of the low-stage roller 11a. The When the discharge valve 28a that opens when the pressure in the low-stage compression chamber 23a reaches a preset pressure opens at the intermediate pressure Pm, the gas refrigerant that has reached the intermediate pressure Pm enters the intermediate discharge space 33 that communicates with the discharge port 26a. Discharged. The intermediate discharge space 33 is a space isolated from the sealed space 29 in the sealed container 13 by the intermediate container 19 and the cover 35, and the internal pressure thereof is basically the intermediate pressure Pm.

  The gas refrigerant having the intermediate pressure Pm discharged from the discharge port 26a is discharged into the intermediate discharge space 33, and then passes through the intermediate communication passage 30 extending from the discharge port 26c to the suction passage 25b and is compressed by the high-stage compressor unit 20b. The air is sucked into the compression chamber 23b from the suction port 25 of the chamber 23b. The suction passage 25b and the suction port 25 are located at the same position as the other passage portions of the intermediate communication passage 30 in the plane angle position, and are located at positions advanced in the plane angle position from the low stage suction passage 25a. The suction and compression start of the compressor unit 20b are delayed from the suction and compression start of the low-stage compressor unit 20a. And the compression chamber expansion part 44 (refer FIG. 3) is formed in the area | region extended from the suction port 25 to the vane side. With such a configuration, the amount of pushing can be reduced without reducing the efficiency. Therefore, the design margin can be increased in setting the amount of pushing on the low stage side and the high stage side, leading to an improvement in efficiency.

The intermediate-pressure Pm gas refrigerant sucked into the high-stage compression chamber 23b is compressed to a predetermined high pressure Pd when the high-stage roller 11b revolves. When the discharge valve 28b that opens when the pressure in the compression chamber 23b reaches a preset pressure opens at high pressure Pd, the gas refrigerant is discharged from the discharge port 26b to the sealed space 29 that is the internal space of the sealed container 13. The gas refrigerant discharged into the sealed space 29 passes through the gap of the electric motor 14 and is discharged from the discharge pipe 27.
(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. 5 is a longitudinal sectional view of a hermetic two-stage rotary compressor according to a second embodiment of the present invention, FIG. 6 is an XX sectional view of FIG. 5, and FIG. 7 is a YY sectional view of FIG. 5 is a ZZ cross-sectional view of FIG.

  The second embodiment is different from the first embodiment in the points described below, and the other points are basically the same as those in the first embodiment, and thus redundant description is omitted.

  In the second embodiment, the intermediate communication passage 30 is disposed close to the vane side, that is, is disposed at the same position as the plane angle position of the suction passage 25b (the rotational direction position of the crankshaft 2). An intermediate flow path connecting pipe 37 extending through the suction passage 25a is provided. The intermediate flow path connecting pipe 37 is hermetically fixed to the end plate portion 19d of the sub bearing 19a and the partition plate 15a.

  Since the gas refrigerant supplied to the high-stage compressor unit 20b passes through the intermediate flow passage connecting pipe 37 passing through the gas refrigerant suction passage 25a of the low-stage compressor unit 20a in this way, the suction passage of the low-stage compressor unit 20a When the liquid refrigerant enters the 25a, the liquid refrigerant is heated, so that the amount of the liquid refrigerant sucked into the low-stage compressor unit 20a can be reduced, and the reliability can be improved.

1 is a longitudinal sectional view of a hermetic two-stage rotary compressor according to a first embodiment of the present invention. It is a mimetic diagram showing a low stage compressor part and a high stage compressor part of a compression mechanism part of a 1st embodiment side by side in a plane. It is XX sectional drawing of FIG. It is YY sectional drawing of FIG. It is a longitudinal cross-sectional view of the hermetic two-stage rotary compressor according to the second embodiment of the present invention. It is XX sectional drawing of FIG. FIG. 6 is a YY sectional view of FIG. 5.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Compressor, 2 ... Crankshaft, rotation center 2a, 5a ... Low stage eccentric part, 5b ... High stage eccentric part, 9 ... Main bearing, 9a ... High stage end plate, 10a ... Low stage cylinder, 10b ... High stage Cylinder, 11a: low stage roller, 11b: high stage roller, 13 ... sealed container, 14 ... electric motor, 15 ... partition plate, 18a ... low stage vane, 18b ... high stage vane, 19 ... intermediate container, 19a ... sub bearing, 19b ... High stage end plate, 19c ... Outer wall part, 20a ... Low stage compressor part, 20b ... High stage compressor part, 23a ... Low stage compression chamber, 23b ... High stage compression chamber, 25a ... Suction passage, 25b ... Suction Passage, 26a ... discharge port, 26b ... discharge port, 26c ... discharge port, 28b ... discharge valve, 30 ... intermediate communication passage, 33 ... intermediate discharge space, 19b ... low stage end plate, 35 ... cover, bolts 36, 37 ... Intermediate channel connecting pipe, 41b ... Vane groove, 43 ... Discharge Port, 44 ... compression chamber enlarged portion.

Claims (4)

In an airtight container, an electric motor, a crankshaft driven by the electric motor, and a compression mechanism portion driven by the crankshaft and including a low stage compressor part and a high stage compressor part are housed,
The crankshaft has a low-stage eccentric part and a high-stage eccentric part whose phase is 180 ° different from the low-stage eccentric part,
The low-stage compressor section is sandwiched between a low-stage cylinder, a low-stage roller disposed in the low-stage cylinder and driven to rotate by the low-stage eccentric section, and the low-stage cylinder and the high-stage cylinder. A partition plate, a low-stage end plate disposed on the side opposite to the partition plate of the low-stage cylinder, and a radial extension from the outer periphery of the low-stage roller to be slidable in a vane groove of the low-stage cylinder Forming a low-stage compression chamber composed of a fitted low-stage vane,
The high stage compressor section includes the high stage cylinder, a high stage roller disposed in the high stage cylinder and driven to rotate by the high stage eccentric part, the partition plate, and an anti-partition of the high stage cylinder. A high-stage end plate disposed on the plate side, and a high-stage vane extending radially from the outer periphery of the high-stage roller and slidably fitted in the vane groove of the high-stage cylinder A hermetic two-stage rotary compressor having a high-stage compression chamber,
The low-stage end plate, the low-stage cylinder, the partition plate, the high-stage cylinder, and the high-stage end plate are stacked in this order, and the plane angle between the vane groove of the low-stage cylinder and the vane groove of the high-stage cylinder In the state where the position is the same, fasten together through the bolt,
An intermediate discharge space through which a medium-pressure gas is discharged from the low-stage compression chamber and a suction port of the high-stage compression chamber pass through the low-stage end plate, the low-stage cylinder, the partition plate, and the high-stage cylinder. A hermetic two-stage rotary compressor characterized in that it communicates via an intermediate communication passage.   2. The hermetic two-stage rotary compressor according to claim 1, wherein the low-stage cylinder includes a suction port that opens in the vicinity of the low-stage vane in the low-stage compression chamber, and the suction port from a side surface of the low-stage cylinder. A suction passage that guides the working fluid to the intermediate passage, and the intermediate communication passage extends from the suction passage of the low-stage cylinder on the vane side, and extends from the low-stage end plate, the low-stage cylinder, and the partition plate. And a hermetically sealed two-stage rotary compressor characterized by comprising holes formed in the high-stage cylinder.   3. The hermetic two-stage rotary compressor according to claim 2, wherein the high-stage cylinder is located on a side opposite to the vane side from the suction port of the low-stage cylinder and opens to the high-stage compression chamber, and the suction A hermetic two-stage rotary compressor having a compression chamber enlarged portion formed in a region extending from the port to the vane side. 2. The hermetic two-stage rotary compressor according to claim 1, wherein the low-stage cylinder includes a suction port that opens in the vicinity of the low-stage vane in the low-stage compression chamber, and the suction port from a side surface of the low-stage cylinder. And a suction passage for guiding the working fluid to the intermediate fluid passage, and the intermediate communication passage includes an intermediate passage connecting pipe extending through the suction passage of the low-stage cylinder. Stage rotary compressor.

Images