Double-cylinder two-stage compressor and refrigeration system having the same

Abstract

The present invention provides a two-cylinder two-stage compressor and a refrigeration system having the same, belonging to the field of air conditioning technology, wherein the two-cylinder two-stage compressor comprises a shell, a pump body assembly is arranged in the shell, the pump body assembly has a reciprocating compression part and a rotary compression part, wherein the rotary compression part includes a roller, and the reciprocating compression part includes a piston, and the pump body assembly also has a crankshaft, the crankshaft also has a first eccentric part corresponding to the roller to drive the roller to rotate, and the crankshaft has a second eccentric part corresponding to the piston to drive the piston to reciprocate. The present invention can take into account the advantages of the compact structure of the reciprocating compressor and the high volumetric efficiency of the rotary compressor by simultaneously driving the rotary compression part and the reciprocating compression part with the crankshaft having both the first eccentric part and the second eccentric part. Therefore, the overall structure of the two-cylinder two-stage compressor is relatively compact and the volumetric efficiency is high, thereby improving the overall energy efficiency of the compressor and increasing the cooling capacity of the compressor.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioning, and in particular relates to a double-cylinder double-stage compressor and a refrigeration system having the same. Background Art

[0002] In the refrigeration compressor industry, due to the inherent structure of the compressor, rotary refrigeration compressors have higher volumetric efficiency than reciprocating refrigeration compressors of the same displacement. Furthermore, during operation, small single-cylinder reciprocating refrigeration compressors compress the return air from the evaporator, allowing the resulting high-pressure gas to enter the condenser. In existing compressor assemblies, the lower return air pressure from the evaporator increases the compression ratio, resulting in lower volumetric efficiency and energy efficiency.

[0003] The double-cylinder double-stage reciprocating piston compressors used in the prior art are all composed of the same two crank-connecting rod mechanisms, and it is difficult to solve the technical problem of low volumetric efficiency of the reciprocating refrigeration compressor. Summary of the Invention

[0004] Therefore, the present invention provides a two-cylinder two-stage compressor and a refrigeration system having the same, which can solve the technical problems in the prior art that the two-cylinder two-stage reciprocating piston compressor uses two sets of identical crank-connecting rod mechanisms, resulting in low volumetric efficiency and low compressor energy efficiency.

[0005] In order to solve the above problems, the present invention provides a two-cylinder two-stage compressor, including a shell, in which a pump body assembly is arranged, and the pump body assembly has a reciprocating compression part and a rotary compression part, wherein the rotary compression part includes a roller, and the reciprocating compression part includes a piston. The pump body assembly also has a crankshaft, and the crankshaft also has a first eccentric part corresponding to the roller to drive the roller to rotate, and the crankshaft has a second eccentric part corresponding to the piston to drive the piston to reciprocate.

[0006] In some embodiments, the rotary compression part has a first-level intake pipe and a first-level exhaust pipe, and the reciprocating compression part has a second-level intake pipe and a second-level exhaust pipe, wherein the first-level intake pipe is connected to the external first-pressure refrigerant of the compressor, and the second-level intake pipe is connected to the external second-pressure refrigerant of the compressor, and the pressure of the first-pressure refrigerant is lower than the pressure of the second-pressure refrigerant, the first-level exhaust pipe and the second-level intake pipe are both connected to the shell cavity of the shell, and the second-level exhaust pipe is connected to the compressor exhaust pipe.

[0007] In some embodiments, the rotary compression portion further includes a flange, a cylinder seat, and a cylinder clamped between the flange and the cylinder seat, a vane groove being constructed on the cylinder, the vane sliding in the vane groove and the end abutting against the outer circumferential wall of the roller, the second eccentric portion being located on the side of the cylinder seat away from the cylinder, and a cylinder head assembly being connected to the cylinder seat.

[0008] In some embodiments, the crankshaft also has a balancing block between the first eccentric portion and the second eccentric portion, the balancing block is located on the side of the cylinder seat away from the cylinder, and the cylinder seat includes a first split body and a second split body, and the first split body and the second split body are respectively constructed with semicircular shaft holes. When the first split body and the second split body are assembled into one, the semicircular shaft holes on the first split body and the second split body embrace the outer circumferential wall of the crankshaft.

[0009] In some embodiments, the cylinder head assembly is assembled on the first split body, and the first split body has a supporting connecting column, and the supporting connecting column is supported and connected to the end surface of the flange facing the cylinder.

[0010] In some embodiments, a motor stator is connected to an end surface of the flange away from the cylinder, and a motor rotor is connected to an end of the crankshaft away from the second eccentric portion.

[0011] In some embodiments, the end surface of the motor stator away from the flange is supported on the bottom of the housing through a compression spring assembly.

[0012] The present invention also provides a refrigeration system comprising the above-mentioned double-cylinder two-stage compressor.

[0013] In some embodiments, the refrigeration system includes a refrigeration evaporator and a freezing evaporator, wherein the refrigerant outlet of the freezing evaporator is connected to the first-level intake pipe of the rotary compression part, and the refrigerant outlet of the refrigeration evaporator is connected to the second-level intake pipe of the reciprocating compression part.

[0014] In some embodiments, the refrigeration evaporator and the first throttling element are connected in series on the refrigeration branch, the freezing evaporator and the second throttling element are connected in series on the freezing branch, the refrigeration branch and the freezing branch are connected in parallel at a first diversion point to form a parallel pipeline unit, and a condenser is connected in series between the first diversion point and the compressor exhaust pipe.

[0015] The present invention provides a two-cylinder two-stage compressor and a refrigeration system having the same. By having a crankshaft having a first eccentric portion and a second eccentric portion simultaneously drive the rotary compression portion and the reciprocating compression portion for compression, the advantages of both the compact structure of the reciprocating compressor and the high volumetric efficiency of the rotary compressor can be taken into account, thereby making the overall structure of the two-cylinder two-stage compressor relatively compact and the volumetric efficiency high, thereby improving the overall energy efficiency of the compressor and increasing the cooling capacity of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the internal structure of a two-cylinder two-stage compressor according to an embodiment of the present invention;

[0017] Figure 2 Schematic diagram of the top view of the structure of a two-cylinder two-stage compressor according to an embodiment of the present invention (omitting components such as the top shell);

[0018] Figure 3 for Figure 1 Schematic diagram of the exploded structure of the pump assembly;

[0019] Figure 4 for Figure 3 Schematic diagram of the exploded structure of the cylinder block;

[0020] Figure 5 for Figure 3 Schematic diagram of the crankshaft structure;

[0021] Figure 6 Schematic diagram of the principle of a refrigeration system according to an embodiment of the present invention.

[0022] The reference numerals indicate:

[0023] 1. Housing; 10. Housing cavity; 11. Compressor exhaust pipe; 21. Roller; 22. First-stage intake pipe; 23. First-stage exhaust pipe; 24. Flange; 25. Cylinder seat; 251. First split body; 252. Second split body; 253. Support connecting column; 254. Connecting hole; 255. Semicircular shaft hole; 26. Cylinder; 27. Slide; 28. First muffler; 31. Piston; 32. Second-stage intake pipe; 33. Second-stage exhaust pipe; 34. Cylinder head assembly; 35. Connecting rod; 36. Second muffler; 41. Crankshaft; 411. First eccentric part; 412. Second eccentric part; 413. Balance block; 51. Motor stator; 52. Motor rotor; 6. Compression spring assembly; 101. Refrigeration evaporator; 102. Refrigeration evaporator; 103. First throttling element; 104. Second throttling element; 105. Condenser. DETAILED DESCRIPTION

[0024] See also Figures 1 to 5As shown, according to an embodiment of the present invention, a two-cylinder two-stage compressor is provided, including a shell 1, which is assembled from a bottom shell and a top shell. A pump body assembly (not labeled in the figure) is arranged in the shell 1, and the pump body assembly has a reciprocating compression part (not labeled in the figure) and a rotary compression part (not labeled in the figure), wherein the rotary compression part includes a roller 21, and the reciprocating compression part includes a piston 31. The pump body assembly also has a crankshaft 41, and the crankshaft 41 also has a first eccentric part 411 corresponding to the roller 21 to drive the roller 21 to rotate, thereby realizing that the rotary compression part compresses the refrigerant in a rotating roller manner. The crankshaft 41 has a second eccentric part 412 corresponding to the piston 31 to drive the piston 31 to reciprocate, thereby realizing that the reciprocating compression part compresses the refrigerant in a reciprocating manner. In this technical solution, the crankshaft having both the first eccentric portion 411 and the second eccentric portion 412 simultaneously drives the rotary compression portion and the reciprocating compression portion for compression, thereby being able to take into account the advantages of both the compact structure of the reciprocating compressor and the high volumetric efficiency of the rotary compressor, thereby making the overall structure of the two-cylinder two-stage compressor more compact and having higher volumetric efficiency, thereby improving the overall energy efficiency of the compressor and increasing the cooling capacity of the compressor.

[0025] In some embodiments, the rotary compression part has a first-stage intake pipe 22 and a first-stage exhaust pipe 23, and the reciprocating compression part has a second-stage intake pipe 32 and a second-stage exhaust pipe 33, wherein the first-stage intake pipe 22 is connected to the first-pressure refrigerant outside the compressor, and the second-stage intake pipe 32 is connected to the second-pressure refrigerant outside the compressor, and the pressure of the first-pressure refrigerant is lower than the pressure of the second-pressure refrigerant. The first-stage exhaust pipe 23 and the second-stage exhaust pipe 32 are both connected to the shell cavity 10 of the shell 1, and the second-stage exhaust pipe 33 is connected to the compressor exhaust pipe 11. In this technical solution, see Figure 2 As shown, the rotary compression part serves as the primary compression component for the refrigerant, and the reciprocating compression part serves as the secondary compression component for the refrigerant. The external refrigerant with lower pressure is introduced into the primary compression component for compression and then mixed with the external refrigerant with higher pressure before entering the secondary compression component for secondary compression. This can effectively reduce the compression ratio of the compressor, thereby achieving the purpose of further improving the energy efficiency of the compressor.

[0026] See also Figure 1 and Figure 2 As shown, the aforementioned first-stage intake pipe 22 is connected to the intake port of the rotary compression part, and the first-stage exhaust pipe 23 is an exhaust port constructed on the first muffler 28, which is directly connected to the shell cavity 10. At the same time, the second-stage intake pipe 32 is arranged on the shell 1, and is connected to the intake port of the reciprocating compression part through the shell cavity 10, so that the second-stage intake pipe 32 and the refrigerant gas after the first-stage compression of the rotary compression part can be inhaled, with a higher intake pressure, which reduces the compression ratio of the reciprocating compression part, thereby achieving further improvement in energy efficiency.

[0027] See also Figure 1 and Figure 3 As shown, the rotary compression portion also includes a flange 24, a cylinder seat 25 and a cylinder 26 clamped between the flange 24 and the cylinder seat 25. The roller 21 is in the central through hole of the cylinder 26. A vane groove is constructed on the cylinder 26. The vane 27 slides in the vane groove and the end abuts against the outer circumferential wall of the roller 21. The second eccentric portion 412 is on the side of the cylinder seat 25 away from the cylinder 26, and the cylinder head assembly 34 is connected to the cylinder seat 25. It can be understood that the piston 31 is sleeved with the second eccentric portion 412 through the connecting rod 35. The piston 31 is in the cylinder cavity of the cylinder head assembly 34. The cylinder seat serves as a structure for pivotally supporting one end of the crankshaft 41 on the one hand, and as an installation carrier for the cylinder head assembly 34 on the other hand, which reduces the number of components, reduces the number of failure points, and makes the structure more reasonable and compact.

[0028] See also Figure 1 As shown, the crankshaft 41 also has a balancing block 413 between the first eccentric portion 411 and the second eccentric portion 412, which is used to improve the rotational dynamic balance performance of the crankshaft 41. The balancing block 413 is located on the side of the cylinder block 25 away from the cylinder 26, and the cylinder block 25 includes a first split body 251 and a second split body 252. The first split body 251 and the second split body 252 are respectively configured with a semicircular shaft hole 255. When the first split body 251 and the second split body 252 are assembled into one, the semicircular shaft holes 255 on the first split body 251 and the second split body 252 embrace the outer circumferential wall of the crankshaft 41. The split structure of the cylinder block 25 can ensure the feasibility of the connection between the crankshaft 41 and it, and can also simplify the structural design of the crankshaft 41. The split structure of the cylinder block 25 is as shown in FIG. Figure 4 As shown, corresponding connecting holes 254 can be constructed between the first and second sub-bodies 251, 252, and the connection between the two sub-bodies can be achieved by screwing screws in the connecting holes 254. In a specific embodiment, the first and second sub-bodies 251, 252 are also constructed with multiple connecting holes 254 that can be threadedly connected to corresponding components, such as the cylinder 26. In a feasible embodiment, the crankshaft 41 can also be designed as a split structure, while the cylinder block 25 can be a single-piece structure. However, this structure may have a certain adverse effect on the overall structural strength of the rotating crankshaft 41.

[0029] In a specific embodiment, the cylinder head assembly 34 is assembled on the first split body 251. At this time, the first split body 251 has a supporting connecting column 253, which is supported and connected to the end face of the flange 24 facing the cylinder 26, thereby increasing the stability and reliability of the overall structure of the first split body 251.

[0030] like Figure 1As shown, a motor stator 51 is connected to the end face of the flange 24 away from the cylinder 26, and a motor rotor 52 is connected (specifically, interference fit) to the end of the crankshaft 41 away from the second eccentric portion 412. The motor stator 51 and the motor rotor 52 constitute the rotating drive component of the crankshaft 41. Arranging the motor stator 51 and the motor rotor 52 at the bottom end of the crankshaft 41 is beneficial to the structural stability of the entire pump body assembly.

[0031] The end face of the motor stator 51 away from the flange 24 is supported on the bottom of the shell 1 (specifically on the inner surface of the bottom shell) through the compression spring assembly 6, which can effectively reduce the transmission of vibration of the pump body assembly to the shell 1, thereby reducing the vibration and noise of the compressor.

[0032] See also Figure 6 As shown, according to an embodiment of the present invention, a refrigeration system is also provided, which is a refrigeration system in a refrigerator, including the above-mentioned two-cylinder two-stage compressor. Specifically, the refrigeration system includes a refrigeration evaporator 101 and a freezing evaporator 102, wherein the refrigerant flow outlet of the freezing evaporator 102 is connected to the first-level suction pipe 22 of the rotary compression part, and the refrigerant outlet of the refrigeration evaporator 101 is connected to the second-level suction pipe 32 of the reciprocating compression part. The refrigeration evaporator 101 and the first throttling element 103 (specifically, it can be an electronic expansion valve) are connected in series on the refrigeration branch, and the freezing evaporator 102 and the second throttling element 104 (specifically, it can be an electronic expansion valve) are connected in series on the freezing branch. The refrigeration branch and the freezing branch are connected in parallel at the first diversion point to form a parallel pipeline unit, and a condenser 105 is connected in series between the first diversion point and the compressor exhaust pipe 11, thereby forming an independent dual-circuit refrigeration system, which can increase the return air pressure (that is, the suction pressure) of the compressor, reduce the compression ratio, increase the cooling capacity, and improve the efficiency of the compressor.

[0033] It is easy for those skilled in the art to understand that, under the premise of no conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0034] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art may make various improvements and variations without departing from the technical principles of the present invention, and such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. A two-cylinder two-stage compressor, characterized in that: The invention comprises a housing (1), wherein a pump body assembly is arranged in the housing (1), wherein the pump body assembly has a reciprocating compression part and a rotary compression part, wherein the rotary compression part includes a roller (21), and the reciprocating compression part includes a piston (31), wherein the pump body assembly further comprises a crankshaft (41), wherein the crankshaft (41) further comprises a first eccentric part (411) corresponding to the roller (21) so as to be able to drive the roller (21) to rotate, and wherein the crankshaft (41) comprises a first eccentric part (411) corresponding to the piston (31) The second eccentric portion (412) is arranged to drive the piston (31) to reciprocate; the rotary compression portion further includes a flange (24), a cylinder seat (25), and a cylinder (26) clamped between the flange (24) and the cylinder seat (25), wherein a sliding vane groove is constructed on the cylinder (26), and the sliding vane (27) slides in the sliding vane groove and the end thereof abuts against the outer circumferential wall of the roller (21), and the second eccentric portion (412) is located on the cylinder seat (25) away from the cylinder (26), and the cylinder head assembly (34) is connected to the cylinder seat (25); the crankshaft (41) also has a balance block (413) between the first eccentric portion (411) and the second eccentric portion (412), the balance block (413) is located on the side of the cylinder seat (25) away from the cylinder (26), and the cylinder seat (25) includes a first split body (251) and a second split body (252), the first split body (251) and the second split body (252) ) are respectively constructed with semicircular shaft holes (255). When the first split body (251) and the second split body (252) are assembled into one, the semicircular shaft holes (255) on the first split body (251) and the second split body (252) embrace the outer circumferential wall of the crankshaft (41); the motor stator (51) is connected to the end face of the flange (24) away from the cylinder (26), and the motor rotor (52) is connected to the end of the crankshaft (41) away from the second eccentric part (412).

2. The two-cylinder two-stage compressor according to claim 1, characterized in that: The rotary compression section has a first-stage intake pipe (22) and a first-stage exhaust pipe (23), and the reciprocating compression section has a second-stage intake pipe (32) and a second-stage exhaust pipe (33), wherein the first-stage intake pipe (22) is connected to the first-pressure refrigerant outside the compressor, and the second-stage intake pipe (32) is connected to the second-pressure refrigerant outside the compressor, and the pressure of the first-pressure refrigerant is lower than the pressure of the second-pressure refrigerant, the first-stage exhaust pipe (23) and the second-stage intake pipe (32) are both connected to the shell cavity (10) of the shell (1), and the second-stage exhaust pipe (33) is connected to the compressor exhaust pipe (11).

3. The two-cylinder two-stage compressor according to claim 1, characterized in that: The cylinder head assembly (34) is assembled on the first split body (251). The first split body (251) has a supporting connection column (253). The supporting connection column (253) is supported and connected to the end surface of the flange (24) facing the cylinder (26).

4. The two-cylinder two-stage compressor according to claim 1, characterized in that: The end surface of the motor stator (51) away from the flange (24) is supported on the bottom of the housing (1) via a compression spring assembly (6).

5. A refrigeration system, characterized in that: The invention comprises the two-cylinder two-stage compressor according to any one of claims 1 to 4.

6. The refrigeration system according to claim 5, characterized in that The invention comprises a refrigeration evaporator (101) and a freezing evaporator (102), wherein the refrigerant outlet of the freezing evaporator (102) is connected to the primary air intake pipe (22) of the rotary compression part, and the refrigerant outlet of the refrigeration evaporator (101) is connected to the secondary air intake pipe (32) of the reciprocating compression part.

7. The refrigeration system according to claim 6, characterized in that The refrigeration evaporator (101) and the first throttling element (103) are connected in series on the refrigeration branch, the freezing evaporator (102) and the second throttling element (104) are connected in series on the freezing branch, the refrigeration branch and the freezing branch are connected in parallel at a first branch point to form a parallel pipeline unit, and a condenser (105) is connected in series between the first branch point and the compressor exhaust pipe (11).

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