CN205533232U - Multi -cylinder rotary compressor and have its refrigerating system - Google Patents

Abstract

The utility model discloses a multi-cylinder rotary compressor and a refrigeration system with the same. Multi-cylinder rotary compressor, the compression mechanism part and the motor are housed in a closed casing connected to the low-pressure side of the refrigeration system. The compression mechanism part includes: a first cylinder and a second cylinder with a first compression chamber and a second compression chamber respectively . The middle partition between the first compression chamber and the second compression chamber, the middle partition is provided with a high-pressure muffler chamber, the first exhaust hole of the first compression chamber and the second exhaust hole of the second compression chamber are respectively connected with The high-pressure muffler chamber is connected. A first end plate and a second end plate provided at the opening ends of the first compression chamber and the second compression chamber and respectively combined with the first cylinder and the second cylinder. Exhaust device for opening or closing the 1st and 2nd exhaust holes. According to the multi-cylinder rotary compressor of the utility model, the difficulty of practical application of the shell low-pressure multi-cylinder rotary compressor is reduced.

Description

Multi-cylinder rotary compressor and refrigeration system having same

technical field

The utility model relates to the field of refrigeration, in particular to a multi-cylinder rotary compressor and a refrigeration system with the compressor.

Background technique

In order to control the global warming effect, etc., the use of natural refrigerants such as flammable refrigerant hydrocarbon gas (R290 and R600a, etc.) and ultra-high pressure refrigerant carbon dioxide gas (CO2) has attracted attention. However, from the perspective of improving the combustion safety of hydrocarbon gas and the design of high-pressure-resistant shells required in carbon dioxide gas, low-pressure rotary compressors with low-pressure shells that contain less refrigerant and low shell pressure Practical use is strongly expected.

Compared with the previous shell high-pressure compressor, the shell low-pressure compressor needs to have a closed high-pressure muffler chamber that accommodates the exhaust gas coming out of the cylinder compression chamber. The conventional shell low-pressure compressor requires additional sealing end plates, fixing bolts, O-rings, etc. in order to form a high-pressure muffler chamber and prevent gas leakage. These design means result in complicated structure and increased cost, and it is also difficult to configure a low-pressure muffler. These problems are also the main reasons for the difficulty in the practical application of the shell low-pressure rotary compressor.

Utility model content

The utility model aims to solve one of the technical problems in the related art at least to a certain extent.

For this reason, the utility model proposes a multi-cylinder rotary compressor, which reduces the practical difficulty of the low-pressure shell multi-cylinder rotary compressor.

The utility model also proposes a refrigeration system with the above-mentioned multi-cylinder rotary compressor.

According to the multi-cylinder rotary compressor of the embodiment of the present invention, the compression mechanism part and the motor are accommodated in the airtight casing connected to the low-pressure side of the refrigeration system, and the compression mechanism part includes: respectively equipped with a first compression chamber and a second compression chamber. The first cylinder and the second cylinder of the cavity, the first cylinder and the second cylinder are respectively provided with a first slide and a second slide; located between the first compression chamber and the second compression chamber The middle partition between them, the middle partition is provided with a high-pressure muffler chamber, the first exhaust hole of the first compression chamber and the second exhaust hole of the second compression chamber are respectively connected with the high-pressure muffler chamber Connected; a first end plate and a second end plate that are provided at the opening ends of the first compression chamber and the second compression chamber and are respectively combined with the first cylinder and the second cylinder; The first piston and the second piston that rotate eccentrically in the first compression chamber and the second compression chamber respectively; the crankshaft that drives the rotation of the first piston and the second piston; is used to open or close the first piston The exhaust means of the exhaust hole and the second exhaust hole.

According to the multi-cylinder rotary compressor of the embodiment of the utility model, the high-pressure muffler chamber is arranged in the middle partition, so that the design is simple and the number of parts is small, which reduces the practical difficulty of the low-pressure multi-cylinder rotary compressor with the shell , while reducing exhaust noise.

In some embodiments of the present invention, the first end plate and the second end plate respectively include low-pressure mufflers serving as low-pressure gas passages for the first compression chamber and the second compression chamber.

Further, the multi-cylinder rotary compressor further includes an oil supply pipe, and the two ends of the oil supply pipe communicate with the low-pressure muffler adjacent to the motor and the oil storage chamber in the casing respectively.

In some embodiments of the present utility model, the first sliding vane cavity and the second sliding vane cavity respectively accommodating the rear ends of the first sliding vane and the second sliding vane communicate with the high-pressure muffler cavity, so One of the first slide chamber and the second slide chamber is provided with a slide spring that presses the corresponding slide.

In some embodiments of the present utility model, the exhaust device is arranged in the high-pressure muffler chamber, and the exhaust device includes two exhaust plates and springs, and the two exhaust plates are respectively used to open or Close the first exhaust hole and the second exhaust hole, and the two ends of the spring are respectively connected with the two exhaust plates to drive the two exhaust plates to close the first exhaust hole and the 2nd vent hole.

In some embodiments of the present utility model, an oil separation plate is fixed on the end of the crankshaft protruding from the motor.

The refrigeration system according to the embodiment of the utility model includes the multi-cylinder rotary compressor according to the above-mentioned embodiment of the utility model.

Further, the exhaust pipe opening to the high-pressure muffler chamber is connected to the oil separator provided outside the casing.

Description of drawings

Fig. 1 is a schematic diagram of a multi-cylinder rotary compressor installed in a refrigeration system according to an embodiment of the present invention;

Fig. 2 is a partial sectional view of the multi-cylinder rotary compressor shown in Fig. 1;

Fig. 3 is the sectional view of X1-X2 direction in Fig. 1;

Fig. 4 is a schematic diagram of a multi-cylinder rotary compressor installed in a refrigeration system according to an embodiment of the present invention, wherein the multi-cylinder rotary compressor is a cross-sectional view along Z1-Z2 in Fig. 3 .

Reference signs:

Multi-cylinder rotary compressor 1, housing 2, oil storage chamber 9, lubricating oil 8, suction pipe 3, exhaust pipe 10,

Compression mechanism part 5, intermediate partition plate 50, first cylinder 11, second cylinder 21, first compression chamber 11a, second compression chamber 21a, first piston 31, second piston 32, first sliding plate 16, second Slide piece 26, first end plate 40, second end plate 45, crankshaft 30, first low-pressure muffler 41, second low-pressure muffler 46, low-pressure gas inlet hole 41a, first suction hole 43, second suction hole 48, muffler Communication hole 49, high-pressure muffler chamber 52, inner ridgeline 53b, outer ridgeline 53a, first exhaust hole 52a, second exhaust hole 52b, exhaust device 58, first vane chamber 14, second vane chamber 24. The first high-pressure hole 54a, the second high-pressure hole 54b, the fluid channel 57, the oil supply pipe 68,

Motor 6, stator 6a, peripheral notch 7, motor coil 6c, vane spring 16a, airtight plug 27, rotor 6b,

Oil separator 70, screw 18, evaporator 83, disc 38, condenser 81, expansion valve 82, oil supply circuit 75.

detailed description

Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial" The orientation or positional relationship indicated by , "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying the referred device Or elements must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as limiting the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In this utility model, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, unless otherwise clearly specified and limited. Connected, or integrated; it can be mechanically connected, or electrically connected, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components , unless expressly defined otherwise. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model according to specific situations.

The multi-cylinder rotary compressor 1 according to the embodiment of the present utility model will be described in detail below with reference to FIGS. type compressor.

As shown in FIGS. 1-4 , according to the multi-cylinder rotary compressor 1 of the embodiment of the present invention, the airtight casing 2 connected to the low-pressure side of the refrigeration system accommodates the compression mechanism part 5 and the motor 6 . That is to say, the multi-cylinder rotary compressor 1 includes a housing 2, a compression mechanism part 5 and a motor 6. The housing 2 is provided with a suction pipe 3 and an exhaust pipe 10. The suction pipe 3 communicates with the low-pressure side of the refrigeration system. 3 communicates with the space in the housing 2, that is, the pressure in the housing 2 is low pressure, the compression mechanism part 5 and the motor 6 are respectively arranged in the housing 2, and the multi-cylinder rotary compressor 1 is a housing low-pressure compressor. The motor 6 includes a stator 6a and a rotor 6b.

The compression mechanism part 5 includes: the first air cylinder 11 and the second air cylinder 21 respectively provided with the first compression chamber 11a and the second compression chamber 21a, the first air cylinder 11 and the second air cylinder 21 are provided with the first sliding plate 16 and the second air cylinder respectively. 2 slides 26. The middle partition 50 between the first compression chamber 11a and the second compression chamber 21a, the middle partition 50 is provided with a high-pressure muffler chamber 52, the first exhaust hole 52a of the first compression chamber 11a and the second compression chamber 21a The second exhaust holes 52b are connected to the high-pressure muffler chambers 52 respectively. The first end plate 40 and the second end plate 45 are provided at the opening ends of the first compression chamber 11a and the second compression chamber 21a and are connected to the first cylinder 11 and the second cylinder 21, respectively. The first piston 31 and the second piston 32 rotate eccentrically in the first compression chamber 11a and the second compression chamber 21a, respectively. The crankshaft 30 that drives the first piston 31 and the second piston 32 to rotate. An exhaust device 58 for opening or closing the first exhaust hole 52a and the second exhaust hole 52b.

In other words, the compression mechanism unit 5 includes the first cylinder 11, the second cylinder 21, the first sliding plate 16, the second sliding plate 26, the intermediate partition plate 50, the first end plate 40, the second end plate 45, and the first piston 31. , the second piston 32, the crankshaft 30 and the exhaust device 58.

The first cylinder 11 is provided with the first compression chamber 11a and the first slide plate 16, the second cylinder 21 is provided with the second compression chamber 21a and the second slide plate 26, and the intermediate partition plate 50 is arranged between the first cylinder 11 and the second cylinder 21 , the first end plate 40 is set on the side of the first cylinder 11 away from the second cylinder 21 , and the second end plate 45 is set on the side of the second cylinder 21 away from the first cylinder 11 .

The rotor 6b is fixed on the crankshaft 30 to drive the crankshaft 30 to rotate. The first piston 31 and the second piston 32 are respectively sleeved on the crankshaft 30 to be driven to rotate by the crankshaft 30. The first piston 31 is eccentrically rotatably arranged in the first compression chamber 11a, and the second piston 32 is eccentrically rotatably arranged in the first compression chamber 11a. 2. In the compression chamber 21a, the first sliding plate 16 cooperates with the first piston 31 to move back and forth, and the second sliding plate 26 cooperates with the second piston 32 to move back and forth.

The middle partition 50 is provided with a high-pressure muffler chamber 52, the high-pressure muffler chamber 52 communicates with the exhaust pipe 10, the first exhaust hole 52a of the first compression chamber 11a is connected with the high-pressure muffler chamber 52, the second chamber of the second compression chamber 21a The exhaust hole 52b is connected with the high-pressure muffler chamber 52 . The exhaust device 58 is used to open or close the first exhaust hole 52a and the second exhaust hole 52b.

When the exhaust pressure in the first compression chamber 11a causes the exhaust device 58 to open the first exhaust hole 52a, the high-pressure refrigerant in the first compression chamber 11a is discharged into the high-pressure muffler chamber 52, and when the second compression chamber 21a When the exhaust pressure of the exhaust device 58 opens the second exhaust hole 52b, the high-pressure refrigerant in the second compression chamber 21a is discharged into the high-pressure muffler chamber 52, and the high-pressure refrigerant discharged into the high-pressure muffler chamber 52 is discharged from the exhaust The pipe 10 discharges the multi-cylinder rotary compressor 1 .

Of course, it can be understood that the multi-cylinder rotary compressor 1 can be a double-cylinder rotary compressor, or the multi-cylinder rotary compressor 1 can also be a compressor with three or more cylinders. The above multi-cylinder rotary compressor 1 further includes at least one third cylinder.

According to the multi-cylinder rotary compressor 1 of the embodiment of the present utility model, by setting the high-pressure muffler chamber 52 in the middle partition 50, the design is simple, the number of parts is small, and the casing of the low-pressure multi-cylinder rotary compressor 1 is reduced. Difficulty in practical application, while reducing exhaust noise.

In some embodiments of the present invention, the first end plate 40 and the second end plate 45 respectively include low-pressure mufflers serving as low-pressure gas passages of the first compression chamber 11a and the second compression chamber 21a. Specifically, the first end plate 40 includes a first low-pressure muffler 41, and the second end plate 45 includes a second low-pressure muffler 46. The first low-pressure muffler 41 serves as a low-pressure gas passage for the first compression chamber 11a, and the second low-pressure muffler 46 serves as The low-pressure gas passage of the second compression chamber 21a. Therefore, two low-pressure mufflers are provided, which can reduce the pulsation sound of the suction gas, and prevent liquid refrigerant and oil from being sucked into the first compression chamber 11a and the second compression chamber 21a.

More specifically, as shown in Figures 1 and 4, the first low-pressure muffler 41 is provided with a low-pressure gas inlet hole 41a, and the first low-pressure muffler 41 and the second low-pressure muffler 46 communicate through the muffler communication hole 49, and the muffler communication hole 49 runs through the first end plate 40 , the first cylinder 11 , the middle partition 50 , the second cylinder 21 and the second end plate 45 .

Of course, it can be understood that the first low-pressure muffler 41 and the second low-pressure muffler 46 can also suck low-pressure gas in other ways. hole.

In some embodiments of the present utility model, the multi-cylinder rotary compressor 1 also includes an oil supply pipe 68, and the two ends of the oil supply pipe 68 are respectively connected to the low-pressure muffler adjacent to the motor 6 (that is, the above-mentioned first low-pressure muffler 41) and The oil storage chamber 9 in the housing 2 communicates. Therefore, due to the flow velocity of the gaseous refrigerant sucked into the first low-pressure muffler 41, a relative negative pressure environment is generated in the first low-pressure muffler 41, and the lubricating oil is supplied into into the first low-pressure muffler 41 to satisfy the lubrication of the first compression chamber 11a and the second compression chamber 21a.

In some embodiments of the present utility model, the first slide chamber 14 and the second slide chamber 24 respectively accommodate the rear ends of the first slide 16 and the second slide 26 communicate with the high-pressure muffler chamber 52, and the first One of the vane chamber 14 and the second vane chamber 24 is provided with a vane spring 16a that presses the corresponding vane. In other words, the first slide cavity 14 accommodates the rear end of the first slide 16, the second slide cavity 24 accommodates the rear end of the second slide 26, and the first slide cavity 14 and the second slide cavity 24 respectively It communicates with the high-pressure muffler chamber 52 , and the first vane chamber 14 or the second vane chamber 24 is provided with a vane spring 16a. The number of components of the multi-cylinder rotary compressor 1 is thereby further reduced.

In some embodiments of the present utility model, as shown in Figure 2, the exhaust device 58 is located in the high-pressure muffler chamber 52, the exhaust device 58 includes two exhaust plates and springs, and the two exhaust plates are respectively used to open Or close the first exhaust hole 52a and the second exhaust hole 52b, and the two ends of the spring are respectively connected with the two exhaust plates to close the first exhaust hole 52a and the second exhaust hole 52b with the constant drive two exhaust plates . When the exhaust pressure in the first compression chamber 11a is greater than the elastic force of the spring, the corresponding exhaust plate opens the first exhaust hole 52a. When the exhaust pressure in the second compression chamber 21a is greater than the elastic force of the spring, the corresponding exhaust plate opens the second exhaust hole 52b. Preferably, the exhaust plate is a circular plate.

In some embodiments of the present invention, as shown in FIGS. 1 and 4 , the end of the crankshaft 30 protruding from the motor 6 is fixed with an oil separation plate 38 , that is, the oil separation plate 38 can rotate with the crankshaft 30 at high speed. The mixed refrigerant composed of low-pressure gas-liquid refrigerant and a small amount of oil flowing into the casing 2 from the suction pipe 3, under the action of the oil separation plate 38, the high-quality liquid refrigerant and oil are scattered to the outer periphery of the stator 6a and then flow into the oil storage chamber. 9 drops, realizing the separation of gas refrigerant, liquid refrigerant and oil. Therefore, the oil discharge amount of the multi-cylinder rotary compressor 1 can be reduced. Preferably, the oil separation plate is a circular plate.

The refrigeration system according to the embodiment of the utility model includes the multi-cylinder rotary compressor 1 according to the above-mentioned embodiment of the utility model.

Furthermore, the exhaust pipe 10 opening to the high-pressure muffler chamber 52 is connected to an oil separator 70 provided outside the housing 2 . Thereby, the circulation amount of oil in the refrigeration system can be reduced, and the lubricating oil separated in the oil separator 70 can be discharged into the first compression chamber 11a and the second compression chamber 21a, preventing the compression of the multi-cylinder rotary compressor 1 Efficiency drops.

The multi-cylinder rotary compressor 1 according to the embodiment of the present utility model will be described in detail below with reference to FIGS. 1-4 .

In FIGS. 1 and 2 , the casing 2 of the multi-cylinder rotary compressor 1 accommodates the compression mechanism 5 and the motor 6 , and the middle partition plate 50 and the outer peripheral wall of the stator 6 a of these components are fixed to the casing 2 . at the inner peripheral wall. In addition, lubricating oil 8 (hereinafter simply referred to as oil 8 ) is sealed in an oil storage chamber 9 provided at the bottom of the housing 2 . In addition, the upper end of the shell 2 is connected with the suction pipe 3, so the pressure of the shell 2 is equivalent to the pressure of the low-pressure side of the refrigeration system. Therefore, the multi-cylinder rotary compressor 1 is a shell low-pressure type.

The compression mechanism part 5 is composed of: the first air cylinder 11 and the second air cylinder 21 fixed on the upper and lower sides of the middle partition plate 50; The first piston 31 and the second piston 32, the first sliding plate 16 and the second sliding plate 26 that are linked to these pistons for reciprocating motion, seal each opening surface of the above-mentioned compression chamber and are respectively connected to the first cylinder 11 and the second cylinder 21 The first end plate 40 and the second end plate 45, the crankshaft 30 that is slidably fitted at the bearings provided at the center to drive the two pistons to eccentrically rotate, the first low-pressure muffler 41 and the first low-pressure muffler 41 provided in each of the above-mentioned end plates. 2 Low-pressure muffler 46 etc. constitute. In addition, the central upper end of the first low-pressure muffler 41 is provided with a low-pressure gas inlet hole 41a.

The first suction hole 43 and the second suction hole 48 provided in the first end plate 40 and the second end plate 45 provide the first compression chamber 11a and the second compression chamber 21a, the first low-pressure muffler 41 and the second low-pressure muffler 46, respectively. hole. These low-pressure mufflers communicate through the muffler communicating holes 49 shown in FIGS. 3 and 4 .

The intermediate partition plate 50 clamped in the first cylinder 11 and the second cylinder 21 constitutes a sealed high-pressure muffler chamber 52 inside, and the high-pressure muffler chamber 52 is equipped with a first exhaust hole 52a and a second exhaust hole 52b. They carry the exhaust device 58 on and off. The first exhaust hole 52a and the second exhaust hole 52b open to the first compression chamber 11a and the second compression chamber 21a, respectively. Therefore, the high-pressure gas in these compression chambers exhausts the high-pressure muffler chamber 52 .

The high-pressure muffler chamber 52 is connected with the discharge pipe 10 , and the outer open end of the discharge pipe 10 is connected with the oil separator 70 necessary for the multi-cylinder rotary compressor 1 . In addition, the two cylinders and the two end plates are fixed to tapped holes provided in the intermediate partition plate 50 with screws 18 .

Due to the start of the motor 6, the mixed refrigerant composed of low-pressure gas-liquid refrigerant and a small amount of oil flowing from the evaporator 83 into the interior of the housing 2 through the suction pipe 3 first rushes to the circular plate 38 that rotates with the crankshaft 30, and the liquid with a large mass The refrigerant and the oil are scattered to the outer periphery of the stator 6a, and drop toward the oil storage chamber 9 along the inner peripheral wall of the casing 2 from the four outer peripheral notches 7 provided on the outer periphery. Here, the liquid refrigerant and oil dissolve the oil 8 in the oil storage chamber 9 to raise the oil level in the oil storage chamber 9 , so the oil level in the oil storage chamber 9 can rise to near the bottom of the first low-pressure muffler 41 .

On the other hand, the gas refrigerant having a light specific gravity mainly flows into the first low-pressure muffler 41 from the low-pressure gas inlet hole 41 a through the inside of the motor coil 6 c. About half of them are sucked into the first compression chamber 11a, and the remaining half is sucked into the second compression chamber 21a from the second suction hole 48 through the muffler communication hole 49 (FIGS. 3 and 4). The low-pressure refrigerant sucked into each compression chamber is compressed into high-pressure refrigerant, and then flows out into the high-pressure muffler chamber 52 through the first exhaust hole 52 a and the second exhaust hole 52 b.

The high-pressure refrigerant discharged from the exhaust pipe 10 to the oil separator 70 becomes a low-pressure refrigerant in the order of the condenser 81, the expansion valve 82, and the evaporator 83, and then returns to the suction pipe 3, the oil separator 70, the condenser 81, and the expansion valve 82. , evaporator 83, and multi-cylinder rotary compressor 1 constitute a circulating refrigeration system. In addition, the oil separator 70 traps a small amount of oil 8 contained in the high-pressure refrigerant discharged from the exhaust pipe 10 . After the captured oil increases, it is returned from the oil supply circuit 75 to the two compression chambers to prevent a drop in compression efficiency.

Next, supplementary explanation will be given based on FIG. 2 . The first slide cavity 14 and the second slide cavity 24 formed by the rear ends of the first slide plate 16 and the second slide plate 26 provided in the first air cylinder 11 and the second air cylinder 21 are respectively passed through the first high pressure hole 54a and the second slide plate chamber 24. The second high-pressure hole 54b communicates with the high-pressure muffler chamber 52 .

Therefore, the above-mentioned two vanes can follow the rotating piston similarly to the case high-pressure rotary compressor. However, since the compressor starts, the vane chamber pressure rises and the vane spring is not needed. That is, the vane spring is only useful when the compressor is started.

As shown in Figure 2, the first slide 16 is equipped with a slide spring 16a, and the second slide 26 is in the state of omitting the slide spring. Boost. Due to this pressurization, the second vane 26 flies out into the second compression chamber 21a so as to follow the second piston 32 which is rotating eccentrically. In this embodiment, since the volume of the high-pressure muffler chamber 52 is limited to a small size, the pressure increase speed is fast. Therefore, when the commercial power supply (50-60 Hz) is turned on, the second sliding piece 26 follows the second piston 32 within 2 seconds, and no knocking sound can be felt.

However, if the shell high-pressure rotary compressor omits the vane spring, it is necessary to wait for the pressure boost of the large-capacity shell. If the volume of the housing is compared with the volume of the high-pressure muffler chamber 52 of this embodiment, the volume ratio is at least 50 times worse, and the volume of the housing is larger.

Therefore, there is a large difference in the following time of each slide. The low-pressure casing type multi-cylinder rotary compressor 1 of this embodiment can be put into practical use, but the high-pressure casing type rotary compressor is difficult to put into practical use. In addition, in the design using an inverter motor, starting from a low speed such as 10rps takes a long time to boost the pressure, so it is more difficult to practically omit the vane spring in the high-pressure rotary compressor with a shell.

If the slide spring can be omitted, not only the slide spring but also the attached sealing plug 27 are not used, so it is good from the viewpoint of cylinder rigidity maintenance. In addition, it can be understood that the installation position of the slide spring can be changed, the second slide 26 can be equipped with a slide spring, and the first slide 16 can omit the slide spring.

Next, the design of the high-pressure muffler chamber 52 will be described with reference to FIG. 3 . The high-pressure muffler chamber 52 can avoid the interference of all 8 screws 18 and the muffler communication hole 49, so it consists of 3 chambers and 1 small chamber, and is formed by a circular inner ridgeline 53b and a petal-shaped outer ridgeline 53a. The first exhaust hole 52a shown by the dotted line is opened to the high-pressure muffler chamber 52 and the first compression chamber 11a, and the first suction hole 43 is opened to the first low-pressure muffler 41 and the first compression chamber 11a. Furthermore, the five fluid passages 57 are passages for refrigerant and oil.

The oil supply pipe 68 (cross section) arranged in the fluid channel 57 passes the pressure difference between the oil storage chamber 9 and the first low-pressure muffler 41, and supplies oil from the first low-pressure muffler 41 to the first compression chamber 11a and the second compression chamber 21a in the thin tube (Figure 4). After lubricating the two compression chambers, the oil flows into the high-pressure muffler chamber 52 together with the high-pressure refrigerant, and passes through the oil separator 70 from the exhaust pipe 10 to become the circulating oil discharge volume for the refrigeration system. Therefore, the design of the oil supply pipe 68 connected to the first low-pressure muffler 41 determines the circulating oil discharge volume.

We all know that if the circulating oil discharge exceeds 1%, the performance of the refrigeration system will be reduced. Therefore, if the first low-pressure muffler 41 sucks undesired oil, it is impossible to control the circulating oil discharge amount. As a solution to this problem, the present embodiment includes the high-speed rotating disk 38 and the first low-pressure muffler 41 as described above. Moreover, the position of the low-pressure gas inlet hole 41a is elevated to prevent the inhalation of liquid refrigerant while avoiding the inhalation of oil coming out of the oil storage chamber 9 .

In this embodiment, since the pressure of the casing 2 is low pressure, the high-pressure muffler chamber 52 that accommodates the exhaust device 58 must be of a sealed structure. Therefore, it is necessary to divide and configure the partition plate 50 . As this means, a design in which the cylindrical partition plate 50 is divided into two in the horizontal direction, or a design in which the middle portion of the open high-pressure chamber is sealed with two flat plates, etc. are adopted. In addition, the method of welding the components of the muffler, and the method of tightly connecting the flat surfaces of the polished parts can be adopted.

In Fig. 2, the exhaust device 58 of the high-pressure muffler chamber 52 adopts the design of using a coil spring to control two opposite circular plates, but it can be understood that the exhaust device 58 can also be formed into other structures, such as Adopt the tongue type valve that is used in the prior art to open or close the exhaust hole.

In FIG. 4 , in addition to the arrangement of the first low-pressure muffler 41 , the second low-pressure muffler 46 and the muffler communication hole 49 , an oil supply pipe 68 and an exhaust pipe 10 are arranged. In this embodiment, by disposing the high-pressure muffler chamber 52 in the middle partition 50 , the benefit is that low-pressure mufflers can be respectively disposed in the first end plate 40 and the second end plate 45 .

The above-mentioned low-pressure muffler can not only avoid the suction of liquid refrigerant and oil, but at the same time, the low-pressure gas enters the first compression chamber 11a and the second compression chamber 21a respectively through the two low-pressure mufflers, which can reduce the suction gas pulsation sound generated in these compression chambers. In addition, the internal pressure of these mufflers is equivalent to the internal pressure of the case 2, so strict gas leakage design is not required. Therefore, the structure of the low-pressure muffler can continue to use the exhaust muffler in the conventional high-pressure rotary compressor with a shell.

The compressor in the utility model can be not only a vertical two-cylinder rotary compressor, but also a multi-cylinder rotary compressor with three or more cylinders, or a horizontal rotary compressor with the crankshaft placed in a horizontal direction. It may be an oscillating rotary compressor in which pistons and vanes are integrated.

The rotary compressor of the utility model is most suitable for use in a machine using hydrocarbon or carbonic acid gas as a refrigerant, wherein the machine can be an air conditioner, a refrigerator, or a water heater. In addition, most of the other components and assembly methods in the rotary compressor of the present invention can borrow the components and assembly methods of the current shell high-pressure rotary compressor, so it is more beneficial to the rotary compressor of the present utility model. practicality.

In the present invention, unless otherwise clearly specified and limited, the first feature may be in direct contact with the first feature or the first feature and the second feature through an intermediary indirect contact. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

In the description of this specification, descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structures, materials or features are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary, and should not be construed as limitations of the present invention, and those of ordinary skill in the art are within the scope of the present invention. Variations, modifications, substitutions and variations can be made to the above-described embodiments.

Claims (8)

1. A multi-cylinder rotary compressor is characterized in that a compression mechanism part and a motor are accommodated in a closed housing connected to the low-pressure side of the refrigeration system, and the compression mechanism part includes: A first cylinder and a second cylinder respectively having a first compression chamber and a second compression chamber, wherein the first cylinder and the second cylinder are respectively provided with a first slide and a second slide; The middle partition between the first compression chamber and the second compression chamber, the middle partition is provided with a high-pressure muffler chamber, the first exhaust hole of the first compression chamber and the second The second exhaust holes of the compression chamber are respectively connected with the high-pressure muffler chamber; a first end plate and a second end plate provided at the opening ends of the first compression chamber and the second compression chamber and respectively combined with the first cylinder and the second cylinder; a first piston and a second piston that rotate eccentrically in the first compression chamber and the second compression chamber, respectively; a crankshaft that drives the rotation of the first piston and the second piston; An exhaust device for opening or closing the first exhaust hole and the second exhaust hole. 2. The multi-cylinder rotary compressor according to claim 1, wherein the first end plate and the second end plate are respectively provided with the first compression chamber and the second compression chamber. Low-pressure mufflers for low-pressure gas passages. 3. The multi-cylinder rotary compressor according to claim 2, further comprising an oil supply pipe, the two ends of the oil supply pipe are respectively connected to the low-pressure muffler adjacent to the motor and the inside of the casing. The oil storage chamber is connected. 4. The multi-cylinder rotary compressor according to claim 1, wherein the first vane cavity and the second vane accommodate the rear ends of the first vane and the second vane respectively. The cavity communicates with the high-pressure muffler cavity, and a slide spring for pressing the corresponding slide is provided in one of the first slide cavity and the second slide cavity. 5. The multi-cylinder rotary compressor according to claim 1, wherein the exhaust device is arranged in the high-pressure muffler chamber, the exhaust device comprises two exhaust plates and a spring, the Two exhaust plates are respectively used to open or close the first exhaust hole and the second exhaust hole, and the two ends of the spring are respectively connected with the two exhaust plates to drive the two The exhaust plate closes the first exhaust hole and the second exhaust hole. 6. The multi-cylinder rotary compressor according to claim 1, wherein an oil separation plate is fixed on the end of the crankshaft protruding from the motor. 7. A refrigeration system, characterized by comprising the multi-cylinder rotary compressor according to any one of claims 1-6. 8 . The refrigerating system according to claim 7 , wherein an exhaust pipe opening into the high-pressure muffler chamber is connected to an oil separator provided outside the housing. 8 .