CN217055590U - Compression structure, compressor and refrigeration plant - Google Patents

Abstract

The application belongs to the technical field of refrigeration, and particularly relates to a compression structure, a compressor and refrigeration equipment, wherein the compression structure comprises a first cylinder, a second cylinder, a middle plate and a crankshaft, and the first cylinder is provided with a first compression cavity and a first piston; the second cylinder is provided with a second compression cavity and a second piston; the middle plate is arranged between the first cylinder and the second cylinder, the middle plate is provided with a sliding hole, and a communication channel for communicating an air outlet of the first compression cavity with an air inlet of the second compression cavity is formed in the middle plate; the crankshaft comprises a first eccentric section, a middle shaft section and a second eccentric section which are connected in sequence; the first eccentric section is positioned in the first compression cavity and connected with the first piston; the second eccentric section is positioned in the second compression cavity and connected with the second piston; the middle shaft section is arranged in the sliding hole in a penetrating way and is in sliding fit with the sliding hole; the intermediate shaft section is supported by the sliding hole, so that deformation of the intermediate shaft section and deformation of the whole crankshaft during rotation of the crankshaft are reduced, and abrasion of the crankshaft is improved.

Description

Compression structure, compressor and refrigeration plant

Technical Field

The application belongs to the technical field of compressors, and particularly relates to a compression structure, a compressor and refrigeration equipment.

Background

The two-stage rotary compressor generally comprises an intermediate plate, a low-pressure cylinder and a high-pressure cylinder, wherein the low-pressure cylinder and the high-pressure cylinder are respectively arranged on two opposite sides of the intermediate plate. The two-stage rotary compressor is mostly used for household and commercial air conditioners, and the APF (annular Performance Factor) and the comfort of the air conditioner are improved by adding an air injection enthalpy increasing function; moreover, two-stage rotary compressors are rarely used in commercial refrigeration equipment.

However, when the outdoor temperature of the air conditioner changes and refrigerant deposits, the liquid refrigerant flows into the compressor and the liquid reservoir, so that the liquid refrigerant is compressed in the low-pressure cylinder and the high-pressure cylinder, the crankshaft deforms, the crankshaft is worn and broken, and the performance of the compressor is affected.

SUMMERY OF THE UTILITY MODEL

An object of the application is to provide a compression structure, compressor and refrigeration plant, aim at solving the technical problem that the compressor leads to taking place liquid refrigerant compression phenomenon and cause the bent axle to take place wearing and tearing trouble in the cylinder when outdoor temperature changes when the second grade among the prior art is rotatory.

In order to achieve the purpose, the technical scheme adopted by the application is as follows: a compression structure, comprising:

the first air cylinder is provided with a first compression cavity, and a first piston is arranged in the first compression cavity;

the second cylinder is provided with a second compression cavity, and a second piston is arranged in the second compression cavity;

the middle plate is arranged between the first cylinder and the second cylinder, a sliding hole is formed in the middle plate, and a communication channel for communicating an air outlet of the first compression cavity with an air inlet of the second compression cavity is formed in the middle plate;

the crankshaft comprises a first eccentric section, a middle shaft section and a second eccentric section which are sequentially connected;

the first eccentric section is positioned in the first compression cavity and is connected with the first piston;

the second eccentric section is positioned in the second compression cavity and connected with the second piston;

the middle shaft section penetrates through the sliding hole and is in sliding fit with the sliding hole.

Optionally, the compression structure further comprises an auxiliary bearing, the first cylinder is disposed between the intermediate plate and the auxiliary bearing, and an inner surface of the first cylinder, a surface of the intermediate plate and a surface of the auxiliary bearing jointly enclose to form the first compression cavity; the auxiliary bearing is provided with an auxiliary bearing hole;

the compression structure further comprises a main bearing, the second cylinder is arranged between the middle plate and the main bearing, and a second compression cavity is formed by the inner surface of the second cylinder, the surface of the middle plate and the surface of the main bearing in a surrounding mode; the main bearing is provided with a main bearing hole;

the crankshaft further comprises a main bearing section and a secondary bearing section, the main bearing section is connected with the end part, back to the middle shaft section, of the second eccentric section, and the main bearing section penetrates through the main bearing hole and is in sliding fit with the main bearing hole;

the auxiliary bearing section is connected with the end part of the first eccentric section back to the middle shaft section, and the auxiliary bearing section penetrates through the auxiliary bearing hole and is in sliding fit with the auxiliary bearing hole.

Optionally, at least one of an outer diameter of the first eccentric section and an outer diameter of the second eccentric section is smaller than or equal to an inner diameter of the sliding hole.

Optionally, the crankshaft further comprises a first connecting section and a second connecting section, the first connecting section is connected between the first eccentric section and the middle shaft section, and the second connecting section is connected between the second eccentric section and the middle shaft section;

the outer diameter of the first connecting section and the outer diameter of the second connecting section are both smaller than the outer diameter of the middle shaft section.

Optionally, the intermediate plate includes two sub-plates, and the two sub-plates are stacked along the axial direction of the intermediate shaft section and are both located between the first cylinder and the second cylinder;

the communicating channel is formed between the two daughter boards, the two daughter boards are provided with sub sliding holes, and the two sub sliding holes are communicated with each other and form the sliding holes.

Optionally, the length of the first connecting section and the length of the second connecting section are both greater than or equal to the thickness of the sub-plate.

One or more technical solutions in the compression structure provided by the present application have at least one of the following technical effects: the compression structure specifically comprises a first cylinder, a second cylinder, a middle plate arranged between the first cylinder and the second cylinder and a crankshaft sequentially penetrating through the first cylinder, the middle plate and the second cylinder, wherein when the compression structure works, a first eccentric section of the crankshaft drives a first piston in the first cylinder to eccentrically rotate in a first compression cavity, so that a refrigerant in the first compression cavity is compressed for the first time; the refrigerant after the first compression enters a second compression cavity through a communication channel of the intermediate plate, and a second eccentric section of the crankshaft drives a second piston in a second cylinder to perform second compression under the eccentric rotation in the second compression cavity, so that the two-time compression of the refrigerant is realized; in the process of rotation of the crankshaft, the intermediate shaft section is in sliding fit with the sliding hole in the intermediate plate, so that the sliding hole can support the intermediate shaft section, deformation of the intermediate shaft section and deformation of the whole crankshaft in the process of rotation of the crankshaft are reduced, abrasion of the crankshaft is improved, in addition, the crankshaft is small in deformation, a lubricating oil film on the crankshaft is distributed more uniformly, abrasion of the crankshaft is further improved, and the problem of abrasion failure of the crankshaft when a liquid refrigerant compression phenomenon occurs in the first cylinder and the second cylinder can be solved; in addition, the first cylinder is communicated with the second cylinder through the communicating channel in the middle plate, so that the communicating pipe for communicating the first cylinder with the second cylinder is not required to be additionally arranged, the number of parts of the compression mechanism is reduced, and the whole structure of the compression mechanism is compact. In another embodiment of the present application, a compressor is provided, which includes a housing and a rotary driving member disposed in the housing, and the compressor further includes the above-mentioned compression structure disposed in the housing, and the rotary driving member is connected to the crankshaft and is used for driving the crankshaft to rotate.

The application adopts another technical scheme that: a compressor comprises a shell and a rotary driving piece arranged in the shell, and further comprises a compression structure, wherein the compression structure is arranged in the shell, and the rotary driving piece is connected with a crankshaft and used for driving the crankshaft to rotate.

Optionally, the compressor further comprises a refrigerant refrigeration cycle device, the gas outlet of the second compression cavity is communicated with the inner cavity of the shell, the shell is provided with an exhaust pipe, and the refrigerant refrigeration cycle device is connected between the exhaust pipe and the gas inlet of the first compression cavity and used for cooling the refrigerant discharged by the exhaust pipe and then conveying the cooled refrigerant into the first compression cavity again.

Optionally, the refrigerant refrigeration cycle device includes a condenser, a first expansion valve, a gas-liquid separator, a second expansion valve, an evaporator and a reservoir, which are sequentially communicated, an air inlet of the condenser is communicated with the exhaust pipe, and an air outlet of the reservoir is communicated with an air inlet of the first compression cavity.

Optionally, the refrigerant refrigeration cycle device further includes a gas refrigerant pipe, and the gas refrigerant pipe is communicated with the gas outlet of the gas-liquid separator and the second compression cavity.

According to the compressor provided by the embodiment of the application, due to the adoption of the compression structure, in the rotating process of the crankshaft, the middle shaft section is in sliding fit with the sliding hole in the middle plate through the middle shaft section, so that the sliding hole can support the middle shaft section, the deformation of the middle shaft section and the deformation of the whole crankshaft are reduced in the rotating process of the crankshaft, the abrasion of the crankshaft is improved, in addition, the deformation of the crankshaft is small, a lubricating oil film on the crankshaft is distributed more uniformly, the abrasion of the crankshaft is further improved, and the problem of the abrasion fault of the crankshaft when the liquid refrigerant compression phenomenon occurs in the first cylinder and the second cylinder can be solved; in addition, the first cylinder and the second cylinder are communicated through the communicating channel in the middle plate, so that a communicating pipe for communicating the first cylinder and the second cylinder is not required to be arranged outside the shell, the number of parts of the compressor is reduced, and the compressor is good in integral structure compactness.

Another technical solution of the present application is: a refrigeration plant comprises the compressor.

According to the refrigeration equipment provided by the embodiment of the application, due to the adoption of the compressor, in the rotating process of the crankshaft, the intermediate shaft section is in sliding fit with the sliding hole in the intermediate plate through the intermediate shaft section, so that the sliding hole can support the intermediate shaft section, the deformation of the intermediate shaft section and the deformation of the whole crankshaft are reduced in the rotating process of the crankshaft, the abrasion of the crankshaft is improved, in addition, the deformation of the crankshaft is small, the lubricating oil film on the crankshaft is distributed more uniformly, the abrasion of the crankshaft is further improved, and the problem of abrasion fault of the crankshaft when the liquid refrigerant compression phenomenon occurs in the first cylinder and the second cylinder can be solved; in addition, the first cylinder is communicated with the second cylinder through the communicating channel in the middle plate, so that a communicating pipe for communicating the first cylinder with the second cylinder does not need to be arranged outside the shell, the number of parts of the compressor is reduced, and the compressor is good in integral structure compactness.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiments or the prior art description will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings may be obtained according to these drawings without inventive labor.

Fig. 1 is a sectional view of a compressor according to an embodiment of the present application.

Fig. 2 is a sectional view taken along the line a in fig. 1.

Fig. 3 is a sectional view taken along the line B in fig. 1.

Fig. 4 is a sectional view taken along line C in fig. 1.

Fig. 5 is a schematic view of the structure of the intermediate plate and the main shaft shown in fig. 1.

Wherein, in the figures, the respective reference numerals:

1-compressor 2-housing 3-exhaust pipe

4-rotary driving piece 4 b-rotor 5-compression structure

8-lubricating oil 10-crankshaft 10A-main shaft section

10B-second eccentric section 10C-intermediate shaft section 10D-first eccentric section

10E-auxiliary shaft section 10H-shaft core oil supply hole 12-main bearing

12 a-outlet 12M-silencer 13-second cylinder

13A-second compression chamber 13B-second piston 13C-second sliding vane

13 a-medium pressure air inlet hole 14- intermediate plate 14A, 14B-sub-plate

14C-sliding hole 14D-medium pressure cavity 14E-aligning shaft

14 a-inlet hole 14 b-exhaust valve 14 d-outlet hole

15-first cylinder 15A-first compression chamber 15B-first piston

15C-first sliding sheet 15E-air suction pipe 15F-first spring

16-auxiliary bearing 18-assembly screw 30-condenser

31-first expansion valve 32-gas-liquid separator 33-second expansion valve

34-evaporator 35-liquid reservoir 36-gas refrigerant pipe

38-gas refrigerant injection pipe.

Detailed Description

Reference will now be made in detail to the embodiments of the present application, examples of which are illustrated in fig. 1-5, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functionality throughout. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present application and should not be construed as limiting the present application.

In the description of the present application, it is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings, which is for convenience and simplicity of description, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; the two elements may be connected directly or indirectly through an intermediate medium, or the two elements may be connected through an inner segment or an interaction relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

As shown in fig. 1 to 5, in one embodiment of the present application, a compression structure 5 is provided, which is suitable for use in a compressor 1, particularly in a compressor 1 of an air conditioner or a compressor 1 of a refrigeration equipment.

The compressor 1 comprises a first cylinder 15, a second cylinder 13, an intermediate plate 14 and a crankshaft 10, wherein the first cylinder 15 is provided with a first compression cavity 15A, and a first piston 15B is arranged in the first compression cavity 15A; the second cylinder 13 is provided with a second compression cavity 13A, and a second piston 13B is arranged in the second compression cavity 13A; the middle plate 14 is arranged between the first cylinder 15 and the second cylinder 13, the middle plate 14 is provided with a sliding hole 14C, and a communication channel for communicating an air outlet of the first compression cavity 15A with an air inlet of the second compression cavity 13A is formed in the middle plate 14; the crankshaft 10 comprises a first eccentric section 10D, a middle shaft section 10C and a second eccentric section 10B which are connected in sequence; the first eccentric section 10D is located in the first compression chamber 15A and is connected to the first piston 15B; the second eccentric section 10B is positioned in the second compression chamber 13A and is connected with the second piston 13B; the middle shaft section 10C penetrates through the sliding hole 14C and is in sliding fit with the sliding hole 14C. It should be noted that, in the present embodiment, the sliding fit means that there is a small gap between the two, and the two can be detached with a small external force; specifically, the middle shaft section 10C is in sliding fit with the sliding hole 14C, that is, a gap exists between the middle shaft section 10C and the sliding hole 14C, the gap can ensure that the middle shaft section 10C freely rotates in the sliding hole 14C, and the normal operation of the compression structure 5 is ensured, and the size of the specific gap can be determined according to actual conditions, and is not limited herein, and the normal operation of the compression structure 5 is ensured.

The compression structure 5 of the embodiment of the application, the compression structure 5 specifically includes a first cylinder 15, a second cylinder 13, a middle plate 14 disposed between the first cylinder 15 and the second cylinder 13, and a crankshaft 10 sequentially penetrating the first cylinder 15, the middle plate 14, and the second cylinder 13, when the compression structure 5 is in operation, a first eccentric section 10D of the crankshaft 10 drives a first piston 15B in the first cylinder 15 to eccentrically rotate in a first compression cavity 15A, so as to perform first compression on a refrigerant in the first compression cavity 15A; the refrigerant after the first compression enters the second compression cavity 13A through the communication channel of the intermediate plate 14, and the second eccentric section 10B of the crankshaft 10 drives the second piston 13B in the second cylinder 13 to perform second compression under eccentric rotation in the second compression cavity 13A, so that two-time compression of the refrigerant is realized; in the process of rotation of the crankshaft 10, the intermediate shaft section is in sliding fit with the sliding hole 14C in the intermediate plate 14, so that the sliding hole 14C supports the intermediate shaft section 10C, and therefore deformation of the intermediate shaft section 10C and deformation of the whole crankshaft 10 are reduced in the process of rotation of the crankshaft 10, and abrasion of the crankshaft 10 is improved; in addition, the first cylinder 15 is communicated with the second cylinder 13 through a communication channel in the middle plate 14, so that a communication pipe for communicating the first cylinder 15 with the second cylinder 13 does not need to be additionally arranged, the number of parts of the compression structure 5 is reduced, and the overall structure compactness of the compression structure 5 is good.

In another embodiment of the present application, as shown in fig. 1, the compression structure 5 is further provided to include a secondary bearing 16, the first cylinder 15 is disposed between the intermediate plate 14 and the secondary bearing 16, and an inner surface of the first cylinder 15, a surface of the intermediate plate 14 and a surface of the secondary bearing 16 collectively enclose a first compression chamber 15A; the auxiliary bearing 16 is provided with an auxiliary bearing hole; wherein, a cylindrical compression cavity is arranged in the first cylinder 15, and the middle plate 14 and the auxiliary bearing 16 respectively seal two end openings of the cylindrical compression cavity, thereby enclosing a first compression cavity 15A forming a seal; the compression structure 5 further comprises a main bearing 12, the second cylinder 13 is arranged between the middle plate 14 and the main bearing 12, and a second compression cavity 13A is formed by the inner surface of the second cylinder 13, the surface of the middle plate 14 and the surface of the main bearing 12 in a surrounding mode; the main bearing 12 is provided with a main bearing hole; similarly, a cylindrical compression cavity is arranged in the second cylinder 13, and the middle plate 14 and the main bearing 12 seal two end openings of the cylindrical compression respectively, so as to enclose a sealed second compression cavity 13A; the crankshaft 10 further comprises a main shaft section 10A and an auxiliary shaft section 10E, the main shaft section 10A is connected with the end part of the second eccentric section 10B, which is back to the middle shaft section 10C, and the main shaft section 10A penetrates through the main bearing hole and is in sliding fit with the main bearing hole; the auxiliary shaft section 10E is connected with the end part of the first eccentric section 10D back to the middle shaft section 10C, and the auxiliary shaft section 10E penetrates through the auxiliary bearing hole and is in sliding fit with the auxiliary bearing hole. Specifically, during rotation of the crankshaft 10, the main bearing hole may support the main shaft section 10A, and the sub bearing hole may support the sub shaft section 10E, so that a compressive load acting on the crankshaft 10 may be dispersed to the three parts of the main shaft section 10A, the sub shaft section 10E, and the intermediate shaft section 10C, and thus, wear of the main shaft section 10A and the sub shaft section 10E may be greatly improved.

In this embodiment, it should be noted that the sliding fit means that a small gap is formed between the two, and the two can be detached by a small external force; specifically, the main bearing hole is in sliding fit with the main shaft section 10A, and the auxiliary bearing hole is in sliding fit with the auxiliary shaft section 10E, that is, gaps exist between the main bearing hole and the main shaft section 10A and between the auxiliary bearing hole and the auxiliary shaft section 10E, the gaps can ensure that the main shaft section 10A freely rotates in the main bearing hole, the auxiliary shaft section 10E freely rotates in the auxiliary bearing hole, and the normal operation of the compression structure 5 is ensured, and the size of the specific gap can be determined according to actual conditions, and is not limited herein, so that the normal operation of the compression structure 5 is ensured.

In another embodiment of the present application, as shown in connection with fig. 5, at least one of the outer diameter D3 of the first eccentric section 10D and the outer diameter D1 of the second eccentric section 10B of the compression structure 5 is provided to be smaller than or equal to the inner diameter D2 of the sliding hole 14C. Specifically, the outer diameter D3 of the first eccentric section 10D is smaller than or equal to the inner diameter D2 of the sliding hole 14C, so that the intermediate plate 14 passes through the end of the first eccentric section 10D to be sleeved outside the intermediate shaft section 10C, thereby achieving the assembly of the intermediate plate 14 with the crankshaft 10; alternatively, the outer diameter D3 of the second eccentric section 10B is smaller than or equal to the inner diameter D2 of the sliding hole 14C, so that the intermediate plate 14 passes through the end of the second eccentric section 10B to be sleeved outside the intermediate shaft section 10C, thereby realizing the assembly of the intermediate plate 14 with the crankshaft 10; or, the outer diameter D3 of the second eccentric section 10B and the outer diameter D1 of the first eccentric section 10D are both smaller than or equal to the inner diameter D2 of the sliding hole 14C, so that the intermediate plate 14 can be sleeved outside the intermediate shaft section 10C when passing through any one of the two ends of the crankshaft 10, thereby realizing the assembly of the intermediate plate 14 and the crankshaft 10.

In another embodiment of the present application, as shown in fig. 5, the crankshaft 10 of the compression structure 5 is further provided to include a first connecting section connected between the first eccentric section 10D and the intermediate shaft section 10C, and a second connecting section connected between the second eccentric section 10B and the intermediate shaft section 10C; the outer diameter of the first connecting section and the outer diameter of the second connecting section are both smaller than the outer diameter of the intermediate shaft section 10C. Specifically, the outer diameter of the middle shaft section 10C is relatively large, so that the entire crankshaft 10 has high rigidity and structural strength, and is not easily bent or deformed, thereby further reducing the risk of wear of the crankshaft 10. The outer diameter of the first connecting section and the outer diameter of the second connecting section can be the same or different, and the first connecting section and the second connecting section can be set according to actual needs.

In another embodiment of the present application, as shown in fig. 5, the middle plate 14 of the compression structure 5 is provided to include two sub-plates 14A, 14B, the two sub-plates 14A, 14B being stacked in the axial direction of the middle shaft section 10C and both being located between the first cylinder 15 and the second cylinder 13; a communication channel is formed between the two sub-boards 14A and 14B, the two sub-boards 14A and 14B are respectively provided with a sub-sliding hole 14C, and the two sub-sliding holes 14C are oppositely communicated to form a sliding hole 14C. Specifically, the two sub-plates 14A and 14B are stacked, and the communication passage in the intermediate plate 14 is easier to design and manufacture than the entire plate, so that the gas flow path for cooling the refrigerant from the first compression chamber 15A to the second compression chamber 13A is less complicated.

In a specific embodiment, the adjacent surfaces of the two sub-boards 14A and 14B are both provided with an annular half cavity taking the sliding hole 14C as a center, and the two annular half cavities are surrounded to form a medium-pressure cavity 14D; an air inlet hole 14A is formed in the position, corresponding to the air outlet of the first compression cavity 15A, of the daughter board 14B adjacent to the first air cylinder 15, an air outlet hole 14D is formed in the position, corresponding to the air inlet of the second compression cavity 13A, of the daughter board 14A adjacent to the second air cylinder 13, the air inlet hole 14A and the air outlet hole 14D are communicated with the medium pressure cavity 14D, and the air inlet hole 14A, the air outlet hole 14D and the medium pressure cavity 14D are jointly surrounded to form a communicated channel. Therefore, the communicating channel can be formed only by respectively arranging the annular half cavity, the corresponding air outlet hole 14d and the corresponding air inlet hole 14A on the two sub-plates 14A and 14B, the gas flow path is simple in design structure and easy to manufacture, a U-shaped circular pipe for communicating the first compression cavity 15A with the second compression cavity 13A does not need to be arranged outside the shell 2 of the compressor 1, and the manufacturing cost of the compressor 1 is reduced.

In another embodiment of the present application, shown in connection with fig. 5, the length W3 of the first connection section and the length W1 of the second connection section of the compression structure 5 are both provided to be greater than or equal to the thickness W2 of the sub-boards 14A, 14B. Specifically, the thickness W2 of the sub-plates 14A, 14B is less than or equal to the length W3 of the first connecting section and the length W1 of the second connecting section, so that after the two sub-plates 14A, 14B pass through the corresponding first eccentric section 10D and the second eccentric section 10B, the sub-plates 14A, 14B can move along the radial direction of the crankshaft 10, so that the sub-sliding holes 14C are aligned with the middle shaft section 10C and are sleeved outside the middle shaft section 10C, thereby assembling the crankshaft 10 and the sub-plates 14A, 14B, and if the thickness of the sub-plates 14A, 14B is too large, the sub-plates 14A, 14B can be clamped at the first eccentric section 10D and the second eccentric section 10B, and cannot be sleeved outside the middle shaft section 10C. Wherein the two daughter boards 14A, 14B are the same in thickness; of course, it may be different and the specific values may be selected to meet the mounting requirements of the intermediate plate 14 and crankshaft 10.

In the present embodiment, fig. 5 shows an assembling process between the intermediate shaft section 10C of the crankshaft 10 and the intermediate plate 14 formed by two sub-plates 14A and 14B. The requirements for the assembly to be established are:

(1) the outer diameter D2 of the intermediate shaft segment 10C is greater than or equal to the outer diameter D1 of the second eccentric segment 10B and/or the outer diameter D3 of the first eccentric segment 10D.

(2) The width W2 of the daughter boards 14A, 14B is less than or equal to the length W1 of the second connection section and/or the length W3 of the first connection section.

When the crankshaft 10 and the intermediate plate 14 are completed, 2 aligning shafts 14E prepared in advance are mounted on the two sub-plates 14A, 14B and serve to maintain the two sub-plates 14A, 14B in a concentric state. In other words, the crankshaft 10 assembling process of fig. 5 must be completed before the compression structure 5 is assembled. The material of the intermediate plate 14 is the same as that of the main bearing 12 and the sub-bearing 16, and for example, FC250 (flake graphite cast iron) or the like is used.

In another embodiment of the present application, as shown in fig. 1 to 4, a compressor 1 is provided, which includes a housing 2 and a rotary driving member 4 disposed in the housing 2, the compressor 1 further includes the above-mentioned compression structure 5, the compression structure 5 is disposed in the housing 2, and the rotary driving member 4 is connected to a crankshaft 10 and is used for driving the crankshaft 10 to rotate.

In the compressor 1 of the embodiment of the present application, due to the above-mentioned compression structure 5, in the process of the rotation operation of the crankshaft 10, the intermediate shaft section 10C is in sliding fit with the sliding hole 14C on the intermediate plate 14, so the sliding hole 14C can support the intermediate shaft section 10C, thereby reducing the deformation of the intermediate shaft section 10C and the deformation of the entire crankshaft 10 in the rotation process of the crankshaft 10, and improving the wear of the crankshaft 10, in addition, the deformation of the crankshaft 10 is small, so that the lubricating oil 8 film on the crankshaft 10 is distributed more uniformly, and the wear of the crankshaft 10 is further improved, so that the problem of the wear failure of the crankshaft 10 when the liquid refrigerant compression phenomenon occurs in the first cylinder 15 and the second cylinder 13 can be solved; in addition, the first cylinder 15 is communicated with the second cylinder 13 through a communication channel in the middle plate 14, so that a communication pipe for communicating the first cylinder 15 with the second cylinder 13 does not need to be arranged outside the shell 2, the number of parts of the compressor 1 is reduced, and the overall structure of the compressor 1 is compact.

In another embodiment of the present application, referring to fig. 1, the compressor 1 of the compressor 1 further includes a refrigerant refrigeration cycle device, the air outlet 12a of the second compression cavity 13A is communicated with the inner cavity of the housing 2, the housing 2 is provided with the exhaust pipe 3, and the refrigerant refrigeration cycle device is connected between the exhaust pipe 3 and the air inlet of the first compression cavity 15A, and is configured to cool the refrigerant exhausted by the exhaust pipe 3 and then transport the refrigerant into the first compression cavity 15A again. Specifically, the high-temperature and high-pressure refrigerant discharged from the compressor 1 is cooled by the refrigerant refrigeration cycle device and then returns to the first compression cavity 15A, so that the refrigerant is recycled.

In another embodiment of the present application, as shown in fig. 1, a refrigerant refrigeration cycle apparatus provided with the compressor 1 includes a condenser 30, a first expansion valve 31, a gas-liquid separator 32, a second expansion valve 33, an evaporator 34, and an accumulator 35, which are sequentially connected, wherein a gas inlet of the condenser 30 is communicated with the gas discharge pipe 3, and a gas outlet 12a of the accumulator 35 is communicated with a gas inlet of the first compression cavity 15A. Specifically, the high-temperature and high-pressure refrigerant discharged from the exhaust pipe 3 enters the condenser 30 to be condensed, the condensed refrigerant is expanded from the condenser 30 through the first expansion valve 31, and the expanded refrigerant is separated into a liquid refrigerant and a gas refrigerant in the gas-liquid separator 32; the separated liquid refrigerant is reduced in pressure by the second expansion valve 33, evaporated in the evaporator 34, and then flows into the first compression chamber 15A through the accumulator 35, so that the refrigerant is recycled, wherein the liquid refrigerant that cannot be evaporated is temporarily stored in the accumulator 35.

In another embodiment of the present application, referring to fig. 1, the refrigerant refrigeration cycle apparatus providing the compressor 1 further includes a gas refrigerant pipe 36, and the gas refrigerant pipe 36 is communicated with the gas outlet of the gas-liquid separator 32 and the second compression cavity 13A. Specifically, if the refrigerant refrigeration cycle device adopts an enhanced vapor injection cycle indicated by a dotted line, the gas refrigerant generated by the gas-liquid separator 32 enters the second compression cavity 13A through the gas refrigerant pipe 36; then, the gas refrigerant flows into the communicating channel from the first compression cavity 15A and enters the second compression cavity 13A for confluence, and finally, the gas refrigerant is compressed in the second compression cavity 13A and is discharged from the gas outlet 12a of the second compression cavity 13A, so that the enhanced vapor injection cycle of the compressor 1 is realized, and the refrigerating capacity and the efficiency of the refrigeration cycle of the compressor 1 are improved.

The specific structure of the compressor 1 of the embodiment of the present application is further described below, specifically as follows:

fig. 1 is a sectional view of a compressor 1. A rotary driving part 4 is arranged at the upper part of the cylindrical shell 2, wherein the rotary driving part 4 is a motor, a compression structure 5 is arranged at the lower part of the cylindrical shell 2, and the compression structure 5 is lubricated by lubricating oil 8; the crankshaft 10 is connected to the center of the rotor 4b of the motor, and drives the compression structure 5 through the crankshaft 10.

The compression structure 5 includes the casing 2, a second cylinder 13 fixed in the casing 2, a main bearing 12 sealing an upper surface of a second compression chamber 13A in the second cylinder 13, an intermediate plate 14 sealing a lower surface of the second compression chamber 13A in the second cylinder 13, a first cylinder 15 abutting against a lower surface of the intermediate plate 14, a sub bearing 16 sealing the first compression chamber 15A of the first cylinder 15, and the like. These components are hermetically fixed by fitting screws 18 at the upper and lower ends of the compression structure 5.

The crankshaft 10 fixed in the rotor 4B of the motor includes a main shaft section 10A slidably fitted into a main bearing hole of the main bearing 12, a second eccentric shaft 10B located in the second compression chamber 13A and adapted to drive the second piston 13B to eccentrically rotate, an intermediate shaft section 10C slidably fitted into a slide hole 14C located at the center of the intermediate plate 14, a first eccentric shaft 10D located in the first compression chamber 15A and adapted to drive the first piston 15B to eccentrically rotate, a secondary shaft section 10E slidably fitted into a secondary bearing hole of the secondary bearing 16, a first connecting section connected between the first eccentric section 10D and the intermediate shaft section 10C, and a second connecting section connected between the second eccentric section 10B and the intermediate shaft section 10C.

A shaft core oil supply hole 10H is formed in the crankshaft 10, and the lubricating oil 8 located at the lower portion of the housing 2 lubricates the above-described sliding fit parts through the shaft core oil supply hole 10H by rotation of the crankshaft 10. The lubrication mode between the crankshaft 10 and the intermediate plate 14, and between the main bearing 12 plate and the sub bearing 16 plate, which rotate at high speed, is fluid lubrication that generates an oil film, and an oil film of several micrometers or more is formed during normal operating load.

However, when the crankshaft 10 is deformed into an arcuate shape by a piston reaction force at the time of gas compression in the compression chamber or when a liquid refrigerant is compressed in the compression chamber, in the compressor 1 of the embodiment of the present application, since the intermediate shaft section 10C is supported in the slide hole 14C, the crankshaft 10 is not deformed into an arcuate shape, and abrasion can be prevented by the lubricating oil film in the slide hole 14C.

Next, the operation of the compressor 1 and the flow of the refrigerant will be described with reference to fig. 1. A low-pressure refrigerant flowing from a suction pipe 15E located on a side surface of the first cylinder 15 is compressed by a first piston 15B eccentrically rotating in a first compression chamber 15A to form a medium-pressure refrigerant, and then discharged through an air inlet hole 14a formed in a lower surface of the intermediate plate 14 to a medium-pressure chamber 14D (shown in fig. 3) in the intermediate plate 14; the medium-pressure refrigerant flows out of the exhaust hole 14d formed in the upper surface of the intermediate plate 14 and flows into the intake port of the second cylinder 13. The medium-pressure refrigerant at the intake port of the second cylinder 13 flows out into the second compression chamber 13A, and the high-pressure refrigerant compressed by the second piston 13B is discharged from the outlet port 12a located in the main bearing 12 to the interior of the muffler 12M.

The high-pressure refrigerant is discharged from the muffler 12M to the lower part of the motor, moves to the upper space of the housing 2, and is then discharged from the exhaust pipe 3, the discharged high-pressure refrigerant flows into the condenser 30 to be condensed, the condensed high-pressure refrigerant is expanded by the first expansion valve 31, then enters the gas-liquid separator 32, and is separated into a liquid refrigerant and a gas refrigerant in the gas-liquid separator 32; the separated liquid refrigerant is expanded by the second expansion valve 33 to reduce the pressure, evaporated in the evaporator 34, and then flows into the suction pipe 15E through the liquid reservoir 35; the liquid refrigerant that cannot be evaporated is temporarily stored in the accumulator 35.

If the refrigerant refrigeration cycle device has an enhanced vapor injection cycle indicated by a dotted line, the gas refrigerant generated by the gas-liquid separator 32 enters the second compression cavity 13A through the gas refrigerant pipe 36 and the gas refrigerant injection pipe 38 connected to the medium pressure gas inlet hole 13A of the second cylinder 13, converges with the medium pressure refrigerant conveyed by the intermediate plate 14, and is compressed in the second compression cavity 13A to form a high pressure refrigerant and discharged from the gas outlet 12a, so that the enhanced vapor injection cycle is realized, and the refrigerating capacity and efficiency of the refrigeration cycle of the compressor 1 are improved.

In addition, the gas-liquid separator 32, the gas refrigerant pipe 36, the second expansion valve 33, the gas refrigerant pipe 36 and the gas refrigerant injection pipe 38 can be omitted in the compressor 1 which does not use enhanced vapor injection; the compressor 1 according to the embodiment of the present application can be applied to a water heater, a commercial refrigeration apparatus, or the like. Next, fig. 2, 3 and 4 are sectional views at a, B and C of fig. 1, respectively, and a detailed structure of the compression structure will be described with reference to fig. 2 to 4. Fig. 2 is a cross-sectional view of the first cylinder 15, and shows a compression stroke of a low-pressure refrigerant sucked from the suction pipe 15E.

The first sliding piece 15C is abutted to the first piston 15B to perform reciprocating sliding, so that first compression of a low-pressure refrigerant is realized. In addition, at the time of starting the compression structure 5, since the second vane 13C (fig. 4) of the second cylinder 13 is provided with a vane spring, the first spring 15F may be omitted.

Fig. 3 is a plan view showing the inside of the intermediate plate 14. The exhaust port 14d communicates with an intake port of the second cylinder 13. Since the intermediate shaft section 10C of the crankshaft 10 rotates in the slide hole 14C, the rigidity of the crankshaft 10 increases, the load deformation decreases, and the compression load of the main shaft section 10A and the auxiliary shaft section 10E decreases. Further, an exhaust valve 14B is provided in the exhaust hole 14d, and the exhaust valve 14B is a member of a sub-plate 14B (shown in fig. 1) fixed to the lower surface of the intermediate plate 14.

Fig. 4 is a plan view of the second cylinder 13. An air inlet communicated with the exhaust hole 14d (shown in fig. 3) is in a U shape, and an air outlet 12a is arranged on the main bearing 12; in addition, the constituent parts of the compression structure 5 are firmly fixed by 5 (10 in total, up and down) fitting screws 18.

In another embodiment of the present application, there is provided a refrigeration apparatus including the compressor 1 described above.

In the refrigeration apparatus according to the embodiment of the application, because the compressor 1 is used, in the process of the rotation operation of the crankshaft 10, the intermediate shaft section 10C is in sliding fit with the sliding hole 14C on the intermediate plate 14, so that the sliding hole 14C can support the intermediate shaft section 10C, thereby reducing the deformation of the intermediate shaft section 10C and the deformation of the whole crankshaft 10 in the rotation process of the crankshaft 10, and further improving the abrasion of the crankshaft 10, in addition, the deformation of the crankshaft 10 is small, so that the lubricating oil 8 film on the crankshaft 10 is distributed more uniformly, and the abrasion of the crankshaft 10 is further improved, thus the problem of the abrasion failure of the crankshaft 10 when the liquid refrigerant compression phenomenon occurs in the first cylinder 15 and the second cylinder 13 can be solved; in addition, the first cylinder 15 is communicated with the second cylinder 13 through a communication channel in the middle plate 14, so that a communication pipe for communicating the first cylinder 15 with the second cylinder 13 does not need to be arranged outside the shell 2, the number of parts of the compressor 1 is reduced, and the whole structure of the compressor 1 is compact.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.

Claims (11)

1. A compression structure, characterized by: the method comprises the following steps:

the first cylinder is provided with a first compression cavity, and a first piston is arranged in the first compression cavity;

the second cylinder is provided with a second compression cavity, and a second piston is arranged in the second compression cavity;

the middle plate is arranged between the first cylinder and the second cylinder, a sliding hole is formed in the middle plate, and a communication channel for communicating an air outlet of the first compression cavity with an air inlet of the second compression cavity is formed in the middle plate;

the crankshaft comprises a first eccentric section, a middle shaft section and a second eccentric section which are sequentially connected;

the first eccentric section is positioned in the first compression cavity and connected with the first piston;

the second eccentric section is positioned in the second compression cavity and connected with the second piston;

the middle shaft section penetrates through the sliding hole and is in sliding fit with the sliding hole.

2. The compression structure of claim 1, wherein: the compression structure further comprises an auxiliary bearing, the first cylinder is arranged between the middle plate and the auxiliary bearing, and the inner surface of the first cylinder, the surface of the middle plate and the surface of the auxiliary bearing are jointly surrounded to form the first compression cavity; the auxiliary bearing is provided with an auxiliary bearing hole;

the compression structure further comprises a main bearing, the second cylinder is arranged between the middle plate and the main bearing, and a second compression cavity is formed by the inner surface of the second cylinder, the surface of the middle plate and the surface of the main bearing in a surrounding mode; the main bearing is provided with a main bearing hole;

the crankshaft further comprises a main bearing section and a secondary bearing section, the main bearing section is connected with the end part, back to the middle shaft section, of the second eccentric section, and the main bearing section penetrates through the main bearing hole and is in sliding fit with the main bearing hole;

the auxiliary bearing section is connected with the end part of the first eccentric section back to the intermediate shaft section, and the auxiliary bearing section penetrates through the auxiliary bearing hole and is in sliding fit with the auxiliary bearing hole.

3. The compression structure of claim 1, wherein: at least one of an outer diameter of the first eccentric section and an outer diameter of the second eccentric section is smaller than or equal to an inner diameter of the sliding hole.

4. The compression structure according to any one of claims 1 to 3, wherein: the crankshaft further comprises a first connecting section and a second connecting section, the first connecting section is connected between the first eccentric section and the middle shaft section, and the second connecting section is connected between the second eccentric section and the middle shaft section;

the outer diameter of the first connecting section and the outer diameter of the second connecting section are both smaller than the outer diameter of the middle shaft section.

5. The compression structure of claim 4, wherein: the middle plate comprises two sub-plates which are arranged in a stacked mode along the axial direction of the middle shaft section and are both positioned between the first air cylinder and the second air cylinder;

the communicating channel is formed between the two daughter boards, the two daughter boards are provided with sub sliding holes, and the two sub sliding holes are communicated with each other and form the sliding holes.

6. The compression structure of claim 5, wherein: the length of the first connecting section and the length of the second connecting section are both larger than or equal to the thickness of the sub-plate.

7. A compressor, includes the casing and sets up in rotary drive spare in the casing, its characterized in that: the compressor further comprises a compression structure as claimed in any one of claims 1 to 6, the compression structure being disposed in the housing, and the rotary drive member being connected to the crankshaft and adapted to drive the crankshaft to rotate.

8. The compressor of claim 7, wherein: the compressor further comprises a refrigerant refrigeration circulating device, the gas outlet of the second compression cavity is communicated with the inner cavity of the shell, the shell is provided with an exhaust pipe, and the refrigerant refrigeration circulating device is connected between the exhaust pipe and the gas inlet of the first compression cavity and used for cooling and then conveying the refrigerant discharged by the exhaust pipe into the first compression cavity again.

9. The compressor of claim 8, wherein: the refrigerant refrigeration cycle device comprises a condenser, a first expansion valve, a gas-liquid separator, a second expansion valve, an evaporator and a liquid storage device which are sequentially communicated, wherein an air inlet of the condenser is communicated with the exhaust pipe, and an air outlet of the liquid storage device is communicated with an air inlet of the first compression cavity.

10. The compressor of claim 9, wherein: the refrigerant refrigeration cycle device further comprises a gas refrigerant pipe, and the gas refrigerant pipe is communicated with the gas outlet of the gas-liquid separator and the second compression cavity.

11. A refrigeration appliance, characterized by: a compressor comprising a compressor as claimed in any one of claims 7 to 10.

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