CN103486032B - Two-stage variable capacity compressor and air conditioner - Google Patents

Abstract

The invention discloses a two-stage variable-capacity compressor and an air conditioner, wherein the compressor comprises a compressor body and a liquid distributor, the compressor body comprises a shell, a first flange, a first-stage cylinder, a second flange and a lower cover plate, the second-stage cylinder is provided with a second air suction port and a second sliding sheet groove, a second sliding sheet is arranged in the second sliding sheet groove, a locking groove is arranged on the second sliding sheet, the second flange is provided with a central hole and an assembling hole, an oil groove is arranged on the inner wall of the central hole, a pin capable of moving axially is arranged in the assembling hole, and an elastic reset element is arranged at the tail part of the pin; and a first oil supply channel for communicating the assembly hole with the oil groove and/or a second oil supply channel for communicating the assembly hole with the inner cavity of the shell are/is arranged on the second flange. The two-stage variable-capacity compressor provided by the invention can ensure that the refrigerating oil always exists between the pin and the pin hole, so that the compressor can realize the smooth switching of single and double cylinders, and the performance of the compressor is not deteriorated.

Description

Two-stage variable capacity compressor and air conditioner

technical field

The invention relates to a compressor, in particular to a two-stage variable-capacity compressor and an air conditioner with the two-stage variable-capacity compressor.

Background technique

The capacity adjustment method of an existing two-stage variable capacity compressor (such as the prior patent application number 201220232315.5 applied by the applicant for this patent) relies on the work or unloading of the lower cylinder to realize the single cylinder or double cylinder of the compressor. The operation of the cylinder is controlled, and the operation state of the cylinder working or unloading is realized through a pin. The pin is installed in the pin hole, and a return spring is arranged at the tail of the pin, and the pressure difference between the head and the tail of the pin is used to make the pin telescopically move in the pin hole to selectively lock or release the slide.

When this kind of variable capacity compressor is in double-cylinder operation, due to the large pressure difference between the head and the tail of the pin, it may cause leakage. If there is gas leakage, two bad consequences will be produced: (1) ) The pressure difference is not enough, which makes it impossible to switch to a double cylinder; (2) The suction pressure at the suction port of the lower cylinder increases, resulting in an increase in the exhaust pressure and exhaust temperature, thereby deteriorating the performance of the compressor.

Contents of the invention

In view of the current state of the art above, the first technical problem to be solved by the present invention is to provide a two-stage variable capacity compressor, which can avoid gas leakage at the pin structure, realize smooth switching between single and double cylinders, and ensure compression The performance of the machine will not deteriorate.

The second technical problem to be solved by the present invention is to provide an air conditioner with the above-mentioned two-stage variable capacity compressor.

The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a two-stage variable capacity compressor, including a compressor body and a liquid separator, and the compressor body includes a shell, a first flange, a first The first stage cylinder, the second stage cylinder, the second flange and the lower cover plate, the first stage cylinder has a first suction port, and the first suction port communicates with the exhaust port of the liquid distributor. The second-stage cylinder has a second suction port and a second slide groove, a second slide is installed in the second slide groove, and a locking groove is arranged on the second slide, the second flange It has a central hole and an assembly hole, and an axially movable pin is installed in the assembly hole, the head of the pin can be inserted into the locking groove, and the tail of the pin is equipped with an elastic reset element; the compressor body is also It includes a pressure difference mechanism for generating a pressure difference between the head and the tail of the pin; a first oil supply channel and/or connecting the assembly hole and the center hole are provided on the second flange Or the second oil supply passage connecting the assembly hole with the inner cavity of the housing.

In one of the embodiments, an oil groove is provided on the inner wall of the central hole of the second flange, and the first oil supply channel communicates with the oil groove.

In one of the embodiments, the first oil supply passage includes a first oil passage arranged radially and communicated with the oil groove, and a second oil passage communicated with the first oil passage and the assembly hole.

In one of the embodiments, the second oil passage is a groove opening toward the second-stage cylinder.

In one of the embodiments, the second oil supply channel extends axially from the side of the second flange facing the second-stage cylinder to the side of the other side.

In one of the embodiments, the pressure difference mechanism includes a closed chamber arranged at the tail of the second sliding vane groove and communicating with the locking groove and the inner chamber of the housing, and arranged at the end of the pin opposite to its head. The pressure chamber on one side of the head, the connecting air channel connecting the pressure chamber with the second suction port, and the pressure switching device, the second suction port is selectively connected to the liquid separator through the pressure switching device The exhaust port communicates with the inner chamber of the housing.

In one embodiment, the elastic return element is a spring, a first spring hole is provided in the tail of the pin, the lower cover is arranged under the second flange, and the lower cover A second spring hole corresponding to the assembly hole is provided on the plate, the pressure chamber is formed by the assembly hole below the pin and the second spring hole, and one end of the spring is installed on the first spring hole. One spring hole, and the other end is installed in the second spring hole.

In one of the embodiments, the connecting air passage includes a first connecting hole provided on the second-stage cylinder and communicating with the suction port, and a connecting hole provided on the second flange and communicating with the suction port. The second connection hole connected to the first connection hole, the third connection hole provided on the lower cover and connected to the second connection hole, and the communication hole provided on the lower cover The third connection hole and the fourth connection hole of the second spring hole.

In one of the embodiments, the pressure switching device is a three-way valve.

The technical solution adopted by the present invention to solve the above-mentioned second technical problem is: an air conditioner, which includes the above-mentioned two-stage variable-capacity compressor.

Compared with the prior art, the two-stage variable capacity compressor provided by the present invention can ensure that the pins and pins are There is always refrigerated oil between the holes, which can avoid gas leakage at the pin structure, so that the compressor can achieve smooth switching between single and double cylinders, and at the same time ensure that the performance of the compressor will not deteriorate.

Description of drawings

Fig. 1 is a structural schematic diagram of a two-stage variable capacity compressor in one of the embodiments of the present invention;

Fig. 2 is a cross-sectional schematic diagram of the assembly of the second-stage cylinder, the second flange and the lower cover plate of the two-stage variable capacity compressor shown in Fig. 1;

Fig. 3 is a cross-sectional structural schematic view in another direction where the second-stage cylinder, the second flange and the lower cover plate of the two-stage variable capacity compressor shown in Fig. 1 are assembled together;

Fig. 4 is a front structural schematic view of the second flange of the two-stage variable capacity compressor shown in Fig. 1 .

In the above figures, 1. shell; 1a-exhaust pipe; 2. first flange; 3. first slide; 4. first-stage cylinder; 41-first suction port; 5. partition; 6. The second-stage cylinder; 61. The second suction port; 62. The first connection hole; 63. The second slide groove; 64. The closed cavity; 7. The second flange; 71. The assembly hole; 72. The first Two connecting holes; 73, the first oil supply passage, 73a, the first oil passage, 73b, the second oil passage, 74, the second oil supply passage, 75-central hole, 75a-oil groove, 8, lower cover plate; 81 , the second spring hole; 82, the third connecting hole; 83, the fourth connecting hole; 9, the second slide; 91, the locking groove; 10, the pin; 10a, the first spring hole; 11, the spring; 12, Liquid separator, 13, pressure switching device.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and examples. It should be noted that, in the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

As shown in Figure 1, the two-stage variable capacity compressor in one of the embodiments of the present invention is mainly composed of a compressor body and a liquid separator 12, wherein the compressor body includes a housing 1, a first flange 2, a first First stage cylinder 4, second stage cylinder 6, second flange 7, lower cover plate 8 and pressure difference mechanism, first flange 2, first stage cylinder 4, partition 5, second stage cylinder 6, second method The blue 7 and the lower cover plate 8 are assembled on the bottom of the housing 1 sequentially from top to bottom.

The first-stage cylinder 4 has a first suction port 41 and a first slide groove, and the first suction port 41 communicates with one of the exhaust ports of the liquid distributor 12 through a pipeline, and the first slide The first slide plate 3 is housed in the groove.

Described second-stage cylinder 6 has second suction port 61 and second sliding vane groove 63, and second sliding vane 9 is housed in described second sliding vane groove 63, and this second sliding vane 9 faces the second A locking groove 91 is provided on the side of the flange 7 .

2, 3 and 4, the second flange 7 has a central hole 75 connected to the crankshaft and an assembly hole 71 for accommodating the pin 10, and an oil groove 75a is provided on the inner wall of the central hole 75 A pin 10 that can move axially is installed in the assembly hole 71, the head of the pin 10 can be inserted into the locking groove 91 to lock the second slider groove 63, and the tail of the pin 10 is equipped with Elastic return element (preferably spring 11). Preferably, the centerline of the locking groove 91 and the centerline of the pin 10 are set eccentrically, so as to ensure that the second slide 9 and the roller are completely disengaged, and at the same time, when the pin 10 locks the second slide 9, The top of the pin 10 is not in contact with the bottom of the locking groove 91, ensuring that when the pin 10 needs to break away from the locking groove 91, the top of the pin 10 has enough space to form a pressure chamber.

A pressure differential mechanism is used to create a pressure differential between the head and tail of the pin 10 . In this way, the pressure difference between the head and tail of the pin 10 is used to make the pin 10 telescopically move in the hole of the pin 10 to selectively lock or release the second sliding piece. In order to avoid gas leakage in the gap between the pin 10 and the hole of the pin 10 (at A in FIG. 2 ) and the gap between the tail of the pin 10 and the lower cover plate 8 (at B in FIG. 2 ), the first embodiment of the present embodiment The second flange 7 is provided with a first oil supply passage 73a communicating with the assembly hole 71 and the oil groove 75a. Preferably, in order to facilitate processing, the first oil supply passage 73a includes a first oil passage 73a arranged radially and communicated with the oil groove 75a and a second oil passage 73a connected with the first oil passage 73a and the assembly hole 71 Oil passage 73b. Further preferably, the second oil passage 73b is a groove (preferably a rectangular groove) opening toward the second-stage cylinder 6 . In addition, a second oil supply channel 74 communicating with the assembly hole 71 and the inner cavity of the casing 1 may also be provided on the second flange 7 . Preferably, the second oil supply channel 74 extends axially from the side of the second flange 7 facing the second-stage cylinder 6 to the other side. In this way, when the oil level does not drop very low, the refrigerated oil can enter the two gaps through the second oil supply passage 74, thereby reaching the oil seal.

The pressure difference mechanism of this embodiment includes a closed chamber 64 arranged at the tail of the second sliding vane groove 63 and communicating with the locking groove 91 and the inner chamber of the housing 1, and arranged on the pin 10 facing away from it. The pressure chamber on one side of the head, the connecting air passage connecting the pressure chamber with the second suction port 61, and the pressure switching device 13, and the second suction port 61 is selectively connected to the pressure switching device 13 through the pressure switching device 13. The exhaust port of the liquid distributor 12 communicates with the inner cavity of the housing 1 . Preferably, the pressure switching device 13 is a three-way valve, one port of the pressure switching device 13 is connected to the other exhaust port of the liquid distributor 12, and the second port of the pressure switching device 13 is connected to the second suction port 61, The third port of the pressure switching device 13 is connected to the exhaust pipe 1a. When the second suction port 61 communicates with the exhaust port of the liquid distributor 12, the tail of the pin 10 is under low pressure, forming a pressure difference with the head of the pin 10. At this time, the pin 10 is loosened from the second slide 9, The compressor operates in two stages; when the second suction port 61 communicates with the exhaust pipe 1a, the tail of the pin 10 is at high pressure, and there is no pressure difference with the head of the pin 10. At this time, the pin 10 will The second slide plate 9 is locked, and the compressor operates in a single stage.

In addition to adopting the structure of this embodiment, the pressure difference mechanism can also adopt other structures, such as the structure adopted in the prior patent application (application number: 201220232315.5) mentioned in the background technology, which will not be repeated here.

Preferably, a first spring hole 10a for placing the spring 11 is provided at the tail of the pin 10 . A second spring hole 81 corresponding to the first spring hole 10 a is provided on the lower cover 8 , and the lower end of the spring 11 is placed in the second spring hole 81 . The assembly hole 71 and the second spring hole 81 below the pin 10 form a pressure chamber, the pressure chamber communicates with the suction port through the connecting air passage, and the connecting air passage is used to transmit pressure, so that the pin 10 There is gas at the same pressure in the tail part and the second suction port 61 . Preferably, the connecting air passage includes a first connecting hole 62 arranged on the second-stage cylinder 6 and communicating with the second suction port 61 , and a first connecting hole 62 arranged on the second flange 7 . And the second connection hole 72 communicated with the first connection hole 62, the third connection hole 82 provided on the lower cover plate 8 and communicated with the second connection hole 72, and the third connection hole 82 provided on the The fourth connection hole 83 on the lower cover plate 8 communicates with the third connection hole 82 and the second spring hole 81 .

The working principle of the embodiment of the present invention is further briefly described below:

1. Double cylinder operation

The refrigerant enters the first suction port 41 and the second suction port 61 through the liquid separator 12 , and the pressure at the first suction port 41 and the second suction port 61 is low pressure. Because the pin 10 will be pressed down by the pressure difference when the two cylinders are running, the second sliding plate 9 is still in the locked state because the required pressure difference is not formed during the solid start-up, and the compressor is in the state of the single cylinder operation at this time. After running for a period of time, the pressure in the housing 1 increases, and at this time the second suction port 61 is at a low pressure, then under the action of the pressure difference, the pin 10 moves downward, and the locking of the second sliding plate 9 is locked. Release, resume operation, the compressor double cylinder operation.

In the two-stage variable capacity compressor of the embodiment of the present invention, since an oil supply channel for supplying oil to the gap between the pin 10 and the assembly hole 71 is provided on the second flange 7, the gap between the pin 10 and the hole of the pin 10 can be ensured. There is always refrigerated oil in between, so that the compressor can realize the smooth switching between single and double cylinders, and at the same time ensure that the performance of the compressor will not deteriorate.

2. Single cylinder operation

The refrigerant is divided into two paths through the liquid separator 12, one path directly enters the first suction port 41, and the other path passes through the pressure switching device 13 and is blocked. At this time, the high-pressure gas in the exhaust pipe 1a enters the second suction port through the pressure switching device 13 61, then the second suction port 61 is under high pressure, and the tail of the pin 10 communicates with the second suction port 61 through the connecting air passage. The tail of the pin 10 is also under high pressure, which is equivalent to the pressure of the housing 1. The pin 10 moves upward under the action of the back-moving spring 11 to lock the second sliding plate 9, and the compressor operates in a single cylinder.

In another embodiment of the present invention, an air conditioner with the above-mentioned two-stage variable capacity compressor is provided.

The above-mentioned embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (10)

1. A two-stage variable capacity compressor, comprising a compressor body and a liquid distributor, said compressor body comprising a housing, a first flange, a first-stage cylinder, a second-stage cylinder, a second flange and a lower cover plate, the first-stage cylinder has a first suction port, and the first suction port communicates with the exhaust port of the liquid separator, and the second-stage cylinder has a second suction port and a second slide A piece groove, a second slide piece is installed in the second slide piece groove, and a locking groove is arranged on the second slide piece, the second flange has a central hole and an assembly hole, and a movable A pin that moves axially, the head of the pin can be inserted into the locking groove, and the tail of the pin is equipped with an elastic reset element; the compressor body also includes a A pressure difference mechanism that generates a pressure difference; it is characterized in that a first oil supply channel that communicates with the assembly hole and the center hole and/or communicates with the assembly hole and the shell is provided on the second flange The second oil supply channel of the body cavity. 2 . The two-stage variable capacity compressor according to claim 1 , wherein an oil groove is provided on the inner wall of the central hole of the second flange, and the first oil supply channel communicates with the oil groove. 3 . 3. The two-stage variable capacity compressor according to claim 2, characterized in that, the first oil supply passage includes a first oil passage arranged radially and communicated with the oil groove and communicated with the first oil passage The second oil passage with the assembly hole. 4. The two-stage variable-capacity compressor according to claim 3, wherein the second oil passage is a groove opening toward the second-stage cylinder. 5. The two-stage variable-capacity compressor according to claim 1, wherein the second oil supply passage extends axially from the side of the second flange facing the second-stage cylinder to the other side side extension. 6. The two-stage variable capacity compressor according to any one of claims 1 to 5, characterized in that the pressure difference mechanism includes a valve arranged at the tail of the second sliding vane groove and communicating with the locking groove The closed cavity with the inner cavity of the housing, the pressure cavity arranged on the side of the pin facing away from its head, the connecting air passage connecting the pressure cavity with the second suction port, and the pressure switching device, the first The two suction ports selectively communicate with the exhaust port of the liquid distributor and the inner cavity of the housing through the pressure switching device. 7. The two-stage variable capacity compressor according to claim 6, wherein the elastic return element is a spring, and a first spring hole is arranged in the tail of the pin, and the lower cover is arranged on the Below the second flange, a second spring hole corresponding to the assembly hole is provided on the lower cover plate, and the pressure chamber is composed of the assembly hole below the pin and the second spring hole. A hole is formed, and one end of the spring is installed in the first spring hole, and the other end is installed in the second spring hole. 8. The two-stage variable-capacity compressor according to claim 7, wherein the connecting air passage includes a first air passage arranged on the second-stage air cylinder and communicating with the second suction port. The connection hole, the second connection hole provided on the second flange and communicated with the first connection hole, the first connection hole provided on the lower cover plate and communicated with the second connection hole Three connection holes and a fourth connection hole provided on the lower cover plate to communicate with the third connection hole and the second spring hole. 9. The two-stage variable capacity compressor according to claim 6, wherein the pressure switching device is a three-way valve. 10. An air conditioner, characterized by comprising the two-stage variable capacity compressor as claimed in any one of claims 1 to 9.