Cylinder block, pump body assembly, compressor and refrigerator

Abstract

The application provides a cylinder seat, a pump body assembly, a compressor and a refrigerator. The cylinder seat comprises a seat body (1), the seat body (1) comprises a cylinder hole, a first material layer (2) is arranged in the cylinder hole, the first material layer (2) and the inner wall of the cylinder hole are connected through an elastic layer (3), and the expansion coefficient of the first material layer (2) is different from the expansion coefficient of the seat body (1). According to the cylinder seat, the thermal expansion problem caused by the adoption of lightweight material by the piston connecting rod can be effectively solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressors, in particular to a cylinder seat, a pump body assembly, a compressor and a refrigerator. BACKGROUND

[0002] At present, as the operating frequency of the piston compressor is higher and higher, the noise and reliability problems of the compressor become stumbling blocks for the development of the compressor. With the increase of the rotating speed of the compressor, the noise of the compressor increases sharply, and the reliability of the compressor will also be challenged.

[0003] The noise of the compressor is mainly composed of mechanical noise, airflow noise and electromagnetic noise. With the increase of the operating frequency of the piston compressor, the unbalanced reciprocating inertia force of the compressor increases exponentially, resulting in a sharp increase in the mechanical noise of the compressor.

[0004] Theoretical research shows that using a lighter piston connecting rod can effectively reduce the mechanical noise of the compressor. Common lightweight piston connecting rods are made of aluminum alloy material, but the aluminum alloy piston scheme has the problem of thermal expansion caused by the increase of the rotating speed of the compressor. Lightly, it causes the compressor to stop temporarily, and heavily, it causes the cylinder hole and the piston of the compressor to be worn and glued, and further causes the compressor to be scrapped. Therefore, although the lightweight piston connecting rod technology can solve the high-frequency noise problem of the compressor, the thermal expansion problem caused by the lightweight technology cannot be solved, and the lightweight technology cannot be implemented. SUMMARY

[0005] Therefore, the technical problem to be solved by the present application is to provide a cylinder seat, a pump body assembly, a compressor and a refrigerator, which can effectively solve the thermal expansion problem caused by the use of lightweight materials for the piston connecting rod.

[0006] In order to solve the above problems, the present application provides a cylinder seat, characterized in that it comprises a seat body, the seat body comprises a cylinder hole, a first material layer is arranged in the cylinder hole, the first material layer and the inner wall of the cylinder hole are connected through an elastic layer, and the expansion coefficient of the first material layer is different from the expansion coefficient of the seat body.

[0007] Preferably, the expansion coefficient of the first material layer is greater than the expansion coefficient of the seat body.

[0008] Preferably, the seat body is made of a powder metallurgy material.

[0009] Preferably, one end of the inner wall of the cylinder hole close to the piston is provided with a stop step, the first material layer and the elastic layer are embedded in the cylinder hole, and the end is stopped on the stop step.

[0010] Preferably, the elastic layer is an elastic plastic layer or an elastic metal sheet.

[0011] According to another aspect of the present application, a pump body assembly is provided, comprising a piston, a connecting rod and a cylinder base, the cylinder base being the cylinder base described above, the piston being slidingly arranged in a cylinder bore of the cylinder base, the connecting rod being connected with the piston, and the material of the piston cooperating part of the cylinder bore being the same as that of the first material layer.

[0012] Preferably, the material of the connecting rod is the same as that of the piston.

[0013] Preferably, the first material layer is an engineering plastic or an aluminum alloy.

[0014] Preferably, the connecting rod comprises a first connecting end and a second connecting end, the first connecting end being provided with a pin hole connected with the piston, the second connecting end being provided with a connecting hole, and the connecting rod further being provided with an oil passage hole inside, the oil passage hole being communicated with the pin hole and the connecting hole.

[0015] Preferably, the outer peripheral wall of the piston is provided with an oil storage groove, the oil storage groove being located on the side of the sealing section of the piston close to the connecting rod.

[0016] Preferably, the pump body assembly further comprises a crankshaft, the crankshaft being rotationally matched with the connecting rod.

[0017] Preferably, the arrangement area of the first material layer accounts for at least 50% of the inner wall area of the cylinder bore.

[0018] Preferably, the first material layer is in a cylindrical shape.

[0019] According to another aspect of the present application, a compressor is provided, comprising the pump body assembly described above.

[0020] According to another aspect of the present application, a refrigerator is provided, comprising the pump body assembly described above.

[0021] The cylinder seat provided by the application comprises a seat body, the seat body comprises a cylinder hole, a first material layer is arranged in the cylinder hole, the first material layer and the inner wall of the cylinder hole are connected through an elastic layer, and the expansion coefficient of the first material layer is different from the expansion coefficient of the seat body. The first material layer with the same material as the piston is arranged in the cylinder hole, the first material layer is matched with the piston, and the first material layer and the inner wall of the cylinder hole are connected through the elastic layer. When the piston is installed in the cylinder seat and works, even if the piston adopts a lightweight material and the piston has a large expansion coefficient and a large expansion deformation occurs, because the first material layer has the same material as the piston, the expansion coefficient of the first material layer is consistent with the expansion coefficient of the piston, the thermal deformation of the first material layer is effectively ensured by the existence of the elastic layer, and the thermal deformation and thermal stress of the first material layer are simultaneously relieved and absorbed, so that the deformation of the first material layer matched with the piston is equivalent to the thermal expansion deformation of the piston, the clearance between the piston and the cylinder hole is ensured to be within the matching range, and the thermal expansion problem caused by the lightweight material of the piston connecting rod is effectively solved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 An exploded structural schematic view of a pump body assembly according to an embodiment of the application;

[0023] Figure 2 A sectional structural schematic view of a pump body assembly according to an embodiment of the application;

[0024] Figure 3 A comparison curve diagram of reciprocating inertial forces of a piston according to related art and a piston according to an embodiment of the application;

[0025] Figure 4 A comparison curve diagram of thermal expansion deformations of a piston according to related art and a piston according to an embodiment of the application;

[0026] Figure 5 A structural schematic view of a connecting rod according to an embodiment of the application;

[0027] Figure 6 A structural schematic view of a piston according to an embodiment of the application;

[0028] Figure 7 A three-dimensional structural schematic view of a cylinder seat according to an embodiment of the application;

[0029] Figure 8 A structural schematic view of a cylinder seat according to an embodiment of the application;

[0030] Figure 9 A sectional structural schematic view of a cylinder seat according to an embodiment of the application;

[0031] Figure 10 A structural schematic view of a cylinder seat according to an embodiment of the application.

[0032] Reference signs are indicated as:

[0033] 1, seat body; 2, first material layer; 3, elastic layer; 4, crankshaft; 5, connecting rod; 51, oil hole; 6, piston; 61, oil storage groove; 7, piston pin; 8, elastic positioning pin; 9, cylinder head assembly; 10, pin hole; 11, connecting hole; 12, bearing hole; 13, stop step. DETAILED DESCRIPTION

[0034] For reference Figures 1 to 10 As shown, according to the embodiment of the present application, the cylinder seat comprises a seat body 1, the seat body 1 comprises a cylinder hole, a first material layer 2 is arranged in the cylinder hole, the first material layer 2 and the inner wall of the cylinder hole are connected through an elastic layer 3, and the expansion coefficient of the first material layer 2 is different from the expansion coefficient of the seat body 1.

[0035] The cylinder seat is provided with the first material layer 2 which is the same as the material of the piston in the cylinder hole, the first material layer 2 cooperates with the piston, and the first material layer 2 and the inner wall of the cylinder hole are connected through the elastic layer 3. When the piston is installed in the cylinder seat and works, even if the piston adopts a lightweight material and the piston has a large expansion coefficient and a large expansion deformation occurs, since the first material layer 2 is the same as the material of the piston, the expansion coefficient of the first material layer 2 can be consistent with the expansion coefficient of the piston, the thermal deformation of the first material layer 2 is effectively guaranteed by the existence of the elastic layer 3, and the thermal deformation and thermal stress of the first material layer 2 can be simultaneously relieved and absorbed, so that the deformation of the first material layer 2 cooperating with the piston is equivalent to the thermal expansion deformation of the piston, the clearance between the piston and the cylinder hole is still within the cooperation range, and thus the thermal expansion problem caused by the lightweight material of the piston connecting rod is effectively solved.

[0036] In one embodiment, the arrangement area of the first material layer 2 accounts for at least 50% of the inner wall area of the cylinder hole. When the arrangement area of the first material layer 2 accounts for at least 50% of the inner wall area of the cylinder hole, it can be guaranteed that at least half of the area of the inner wall of the cylinder hole has the same or similar expansion rate as the piston, the wear and gluing problems caused by the inconsistent expansion rates of the piston and the cylinder seat can be solved to some extent, and the reliability of the compressor operation is improved.

[0037] Preferably, the first material layer 2 is cylindrical, which can ensure that the piston completely cooperates with the cylinder seat through the first material layer 2, and the thermal expansion problem caused by the inconsistent expansion rates of the piston and the cylinder seat is completely eliminated through the first material layer 2.

[0038] In one embodiment, the first material layer 2 has a larger expansion coefficient than the seat body 1, so that the expansion of the first material layer 2 after being heated is larger than the expansion of the seat body 1, thereby ensuring that the first material layer 2 can be tightly attached to the cylinder bore of the seat body 1, and the first material layer 2 will not be deformed during cooperation with the piston, and the stability and reliability of the cooperation structure of the piston and the cylinder seat are improved.

[0039] In one embodiment, the seat body 1 is made of a powder metallurgy material. The seat body 1 is supported by the powder metallurgy material. Since the first material layer 2 has a larger expansion coefficient than the seat body 1, the deformation of the first material layer 2 is large, and the deformation of the seat body 1 is small, thereby limiting the deformation of the first material layer 2. By arranging the elastic layer 3, the deformation of the piston bore of the cylinder seat and the piston can be consistent, and the thermal expansion problem caused by the use of lightweight materials for the piston connecting rod is effectively solved.

[0040] In one embodiment, the inner wall of the cylinder bore is provided with a stop step 13 near one end of the piston 6, and the first material layer 2 and the elastic layer 3 are embedded in the cylinder bore and the end is stopped on the stop step 13. In this embodiment, by arranging the stop step 13 at one end of the inner wall of the cylinder bore, the first material layer 2 and the elastic layer 3 can be axially limited by the stop step 13, thereby ensuring the stability of the overall structure of the cylinder seat.

[0041] In one embodiment, the elastic layer 3 is an elastic plastic layer or an elastic metal sheet.

[0042] According to the embodiments of the present application, the pump body assembly includes a piston 6, a connecting rod 5, and a cylinder seat. The cylinder seat is the cylinder seat described above. The piston 6 is slidingly arranged in the cylinder bore of the cylinder seat. The connecting rod 5 is connected to the piston 6. The material of the piston 6 and the cylinder bore cooperation part is the same as that of the first material layer 2.

[0043] The material of the connecting rod 5 is the same as that of the piston 6.

[0044] In one embodiment, the first material layer 2 is an engineering plastic or an aluminum alloy.

[0045] As a preferred embodiment, the first material layer 2, the piston 6, and the connecting rod 5 are all made of an aluminum alloy material, and the seat body 1 of the cylinder seat is made of a powder metallurgy material.

[0046] The main sources of mechanical noise generated by the piston compressor include unbalanced force of the connecting rod piston system, impact of the valve plate valve piece, and friction of mechanical parts, wherein the unbalanced force of the connecting rod piston system, i.e., the reciprocating inertia force, is the main source of mechanical noise of the piston compressor. The reciprocating inertia force of the piston compressor increases in a quadratic curve manner with the increase of the operating frequency of the compressor, and the high-frequency mechanical noise brought thereby is very large. Therefore, reducing the high-frequency mechanical noise of the compressor by reducing the unbalanced reciprocating inertia force of the piston compressor is the most effective noise reduction scheme.

[0047] The most effective method to reduce the reciprocating inertia force is to reduce the reciprocating inertia mass, which is mainly determined by the piston 6 and the connecting rod 5 of the compressor. Therefore, using a lightweight piston connecting rod is an effective noise reduction technology. Common lightweight piston connecting rods are mostly made of aluminum alloy material, and the density of aluminum alloy material is only 40% of that of powder metallurgy material. Therefore, the application of aluminum alloy piston connecting rod can reduce the reciprocating inertia mass by 60%. With the increase of the operating frequency of the compressor, the reciprocating inertia force of the aluminum alloy material is significantly reduced compared with that of the powder metallurgy material. When the compressor operates at high frequency, the reciprocating inertia force is even reduced by nearly 1 times. Therefore, the lightweight pump body assembly structure of the present application uses a piston and a connecting rod made of aluminum alloy material, effectively reduces the reciprocating inertia mass of the piston compressor, and further reduces the unbalanced reciprocating inertia force of the piston compressor, and finally effectively reduces the mechanical noise of the piston compressor operating at high frequency.

[0048] The lightweight piston connecting rod noise reduction technology has become a new trend of piston compressor noise reduction, and the most common lightweight piston connecting rod material is aluminum alloy. Currently, aluminum alloy connecting rods are widely used in the industry, but aluminum alloy pistons have not been used in refrigerator compressors. The reason is that aluminum alloy pistons have serious thermal expansion deformation when operating at high frequency, which affects the reliability of the compressor. According to the cylinder seat of the embodiment of the present application, a cylinder seat structure is designed to effectively solve the reliability problem caused by the thermal expansion of the lightweight aluminum alloy piston connecting rod scheme. Although the density of aluminum alloy material is only 40% of that of powder metallurgy material, the thermal expansion coefficient of aluminum alloy material is nearly 1.5 times that of powder metallurgy. With the increase of temperature, the deformation of the aluminum alloy material piston in the diameter direction is more than 2 times that of the powder metallurgy piston. The difference in thermal expansion deformation in the diameter direction between the two materials will cause the thermal expansion deformation of the aluminum alloy piston to be much higher than that of the thermal expansion deformation of the cylinder hole of the powder metallurgy cylinder seat. Thus, the gap between the piston and the cylinder hole becomes smaller, and even negative. Further, the piston and the cylinder hole generate wear, gluing, and jamming, and other reliability problems.

[0049] The application embodiment designs a cylinder seat, the cylinder hole adopts a layered structure, and the cylinder seat main body also adopts a powder metallurgy material. An aluminum alloy layer is designed in the cylinder hole. The main role of the aluminum alloy layer is to generate thermal expansion deformation equivalent to the aluminum alloy piston, so as to ensure that the gap between the aluminum alloy piston and the cylinder seat is within the allowable range. An elastic layer 3 is designed in the cylinder hole. The elastic layer 3 is located between the aluminum alloy layer and the inner wall of the cylinder hole of the seat body 1. Since there is also a difference in thermal expansion deformation between the aluminum alloy layer and the seat body 1 of the cylinder seat, the elastic layer 3 is designed to effectively alleviate the difference between the two thermal expansion deformations, reduce stress concentration, and ensure the reliability and service life of the aluminum alloy layer.

[0050] In one embodiment, the connecting rod 5 includes a first connecting end and a second connecting end. The first connecting end is provided with a pin hole 10 connected with the piston 6, and the second connecting end is provided with a connecting hole 11. The connecting rod 5 is further provided with an oil passage hole 51 inside. The oil passage hole 51 communicates the pin hole 10 and the connecting hole 11. The pump body assembly of the application embodiment adopts a light-weight connecting rod 5, the mass of which is reduced by about 60% compared with the original powder metallurgy connecting rod. The center of the light-weight connecting rod is designed with an oil passage hole 51. The oil passage hole 51 transmits the lubricating oil transmitted from the crankshaft 4 to the piston pin 7 and the piston 6 through the connecting rod big end provided with the connecting hole 11, effectively lubricates the piston 6, reduces the friction between the piston 6 and the cylinder hole, and to some extent, reduces the reciprocating inertia mass of the connecting rod 5.

[0051] In one embodiment, an oil storage groove 61 is arranged on the outer peripheral wall of the piston 6, and the oil storage groove 61 is located on the side of the sealing section of the piston 6 close to the connecting rod 5. The piston cylindrical surface is provided with the oil storage groove 61, which is located behind the sealing section of the piston 6, does not affect the sealing performance of the piston 6, reduces the reciprocating mass of the piston 6, and plays a role in storing lubricating oil. The tail of the piston 6 is designed to continue the design of the original powder metallurgy piston, meeting the general requirements.

[0052] In the embodiment, the connecting rod 5 is made of aluminum alloy material, the connecting rod big end provided with the connecting hole 11 cooperates with the eccentric part of the crankshaft 4, and the connecting rod small end provided with the pin hole 10 is connected with the piston 6 through the piston pin 7. The seat body 1, the crankshaft 4, the connecting rod 5, the piston 6 and the piston pin 7 form a slider-crank mechanism. The crankshaft 4 is made of aluminum alloy material, cooperates with the aluminum alloy layer, and reciprocates in the aluminum alloy layer to realize the suction and compression processes of the compressor. The elastic positioning pin 8 is used to fix the piston pin 7 and the piston 6, preventing the up-and-down movement and rotation between the piston pin 7 and the piston 6. The aluminum alloy layer and the elastic layer 3 are arranged in the cylinder hole of the seat body 1, and are fixed in the cylinder hole of the seat body 1 of the cylinder seat through the cylinder head assembly 9, so as to ensure that the aluminum alloy layer does not reciprocate with the piston 6.

[0053] In one embodiment, the end face of the piston 6 is provided with a boss for reducing the residual volume of the compressor and improving the energy efficiency of the compressor.

[0054] In one embodiment, the pump body assembly further comprises a crankshaft 4, the crankshaft 4 is in rotational cooperation with the connecting rod 5, and the cylinder block is further provided with a bearing hole 12.

[0055] In the embodiment, the seat body 1 of the cylinder block is made of powder metallurgy material, and the cylinder hole is designed with an aluminum alloy layer and an elastic plastic layer. The seat body 1 of the cylinder block is made of powder metallurgy material, which is beneficial to ensure the machining precision of the machining process and important dimensions of the cylinder block. The aluminum alloy layer and the elastic plastic layer are embedded in the cylinder hole of the seat body 1 of the cylinder block, and the tail end of the cylinder hole is formed into a stepped hole by a stop step 13, which is used for embedding the aluminum alloy layer and the elastic plastic layer. The aluminum alloy layer and the elastic plastic layer can be limited by the stepped hole at the tail end, and the cylinder hole end surface of the seat body 1 of the cylinder block is connected with the cylinder head assembly 9, which can limit the other end of the aluminum alloy layer and the elastic plastic layer through the cylinder head assembly 9.

[0056] According to the embodiment of the present application, the compressor comprises a pump body assembly, which is the above-mentioned pump body assembly.

[0057] According to the embodiment of the present application, the refrigerator comprises a pump body assembly, which is the above-mentioned pump body assembly.

[0058] It is easy for those skilled in the art to understand that the above-mentioned advantageous modes can be freely combined and superimposed without conflict.

[0059] The above is only the preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above is only the preferred embodiment of the present application, and it should be pointed out that, for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, which should be regarded as the protection scope of the present application.

Claims

1. A pump body assembly, characterized by, The cylinder seat comprises a seat body (1) including a cylinder hole, a first material layer (2) is arranged in the cylinder hole, the first material layer (2) and the inner wall of the cylinder hole are connected through an elastic layer (3), the expansion coefficient of the first material layer (2) is greater than the expansion coefficient of the seat body (1), the arrangement area of the first material layer (2) accounts for at least 50% of the inner wall area of the cylinder hole, a stop step (13) is arranged at one end of the inner wall of the cylinder hole close to a piston (6), the first material layer (2) and the elastic layer (3) are embedded in the cylinder hole, and the end is stopped on the stop step (13); The pump body assembly further comprises a piston (6) and a connecting rod (5), the piston (6) is slidingly arranged in the cylinder hole of the cylinder seat, the connecting rod (5) is connected with the piston (6), the material of the piston (6) and the cylinder hole cooperation part is the same as that of the first material layer (2), and the expansion coefficient of the first material layer (2) is consistent with that of the piston (6). The connecting rod (5) comprises a first connecting end and a second connecting end, the first connecting end is provided with a pin hole (10) connected with the piston (6), the second connecting end is provided with a connecting hole (11), and the connecting rod (5) is further provided with an oil passage (51) in the inside.

2. The pump body assembly of claim 1, wherein, The seat body (1) is made of a powder metallurgy material.

3. The pump body assembly of claim 1, wherein, The elastic layer (3) is an elastic plastic layer or an elastic metal sheet.

4. The pump body assembly of claim 3, wherein, The first material layer (2) is in a cylindrical shape.

5. The pump body assembly of claim 1, wherein, The material of the connecting rod (5) is the same as that of the piston (6).

6. The pump body assembly of claim 5, wherein, The first material layer (2) is an engineering plastic or an aluminum alloy.

7. The pump body assembly of claim 1, wherein, An oil storage groove (61) is arranged on the outer peripheral wall of the piston (6), and the oil storage groove (61) is located on the side of the sealing section of the piston (6) close to the connecting rod (5).

8. The pump body assembly of claim 1, wherein, The pump body assembly further comprises a crankshaft (4), and the crankshaft (4) is rotationally matched with the connecting rod (5).

9. A compressor comprising a pump body assembly, characterized by, The pump body assembly is the pump body assembly according to any one of claims 1 to 8.

10. A refrigerator comprising a pump body assembly, characterized by, The pump body assembly is the pump body assembly according to any one of claims 1 to 8.

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