A pump body assembly, compressor and refrigerator

Abstract

This invention provides a pump body assembly, a compressor, and a refrigerator. The pump body assembly includes a cylinder seat, a connecting assembly, a crankshaft, a first compression assembly, and a second compression assembly. The cylinder seat is provided with at least a first cylinder and a second cylinder, which are arranged on the same side in the horizontal direction, and the centerlines of the first and second cylinders are parallel to each other. The first compression assembly includes a first connecting rod and a first piston, and the second compression assembly includes a second connecting rod and a second piston. The connecting assembly is connected to the crankshaft. The first end of the first connecting rod and the first end of the second connecting rod are respectively connected to the connecting assembly, and the second end of the first connecting rod is connected to the first piston and the second end of the second connecting rod is connected to the second piston. This invention simplifies the assembly process by providing a connecting assembly, and simplifies the structure of the crankshaft, making it easier to assemble.

Description

Technical Field

[0001] This invention belongs to the field of compressor technology, specifically relating to a pump assembly, a compressor, and a refrigerator. Background Technology

[0002] Household refrigerator systems typically consist of two temperature zones: a refrigerator compartment and a freezer compartment. These systems usually employ small reciprocating piston compressors. Current technology generally selects an evaporation temperature based on the freezer compartment temperature. However, due to the significant temperature difference between the refrigerator and freezer compartments, the heat transfer efficiency in the refrigerator compartment is low due to the large temperature difference. Using a traditional single-evaporation-temperature system would result in low system efficiency, and single-stage compressors suffer from excessively high pressure ratios. Existing dual-cylinder piston compressor structures require an additional set of cylinders, pistons, and connecting rods to achieve this structure, with two or more cylinders facing each other, which is difficult to implement. Alternatively, two cylinders can be arranged vertically on the same side, but this requires two eccentric parts on the crankshaft component, and assembling the pistons and connecting rods on the cylinders presents significant challenges. Summary of the Invention

[0003] This invention provides a pump assembly, a compressor, and a refrigerator, which can solve the technical problem of increased assembly difficulty caused by existing dual-cylinder piston compressors, where two or more cylinders are arranged opposite each other or two cylinders are arranged vertically on the same side.

[0004] This invention provides a pump body assembly, which includes a cylinder seat, a connecting assembly, a crankshaft, a first compression assembly, and a second compression assembly;

[0005] The cylinder block is provided with at least a first cylinder and a second cylinder, the first cylinder and the second cylinder are arranged on the same side in the horizontal direction, and the center lines of the first cylinder and the second cylinder are parallel to each other; the first compression assembly includes a first connecting rod and a first piston, the first piston being slidably disposed in the first cylinder; the second compression assembly includes a second connecting rod and a second piston, the second piston being slidably disposed in the second cylinder;

[0006] The crankshaft is disposed in the cylinder block, the connecting assembly is connected to the crankshaft, the first end of the first connecting rod and the first end of the second connecting rod are respectively connected to the connecting assembly, the second end of the first connecting rod is connected to the first piston, and the second end of the second connecting rod is connected to the second piston.

[0007] In some embodiments, in the axial direction of the crankshaft, the first end of the first connecting rod and the first end of the second connecting rod overlap on the connecting assembly.

[0008] In some embodiments, the connecting assembly includes a connecting sleeve connected to the crankshaft, wherein a first end of the first connecting rod and a first end of the second connecting rod are both sleeved on the connecting sleeve.

[0009] In some embodiments, the first connecting rod is disposed above the second connecting rod, and the connecting assembly further includes an intermediate bearing sleeved on the connecting sleeve. The lower end face of the first connecting rod contacts the top surface of the intermediate bearing, and the upper end face of the second connecting rod contacts the bottom surface of the intermediate bearing.

[0010] In some embodiments, a thrust boss is provided at the top of the connecting sleeve, and the first connecting rod, the intermediate bearing and the second connecting rod are sequentially sleeved on the connecting sleeve, with the top surface of the first connecting rod connected to the thrust boss; the bottom end of the connecting sleeve abuts against the eccentric part of the crankshaft.

[0011] In some embodiments, the axial extension directions of the first connecting rod and the second connecting rod are perpendicular to the axis of the crankshaft, the second end of the first connecting rod is rotatably connected to the first piston, and the second end of the second connecting rod is rotatably connected to the second piston.

[0012] In some embodiments, the first compression assembly further includes a first connecting pin and a first limiting pin. The first piston has a first mounting hole in the axial direction and a first through hole in the radial direction. The second end of the first connecting rod is installed in the first mounting hole, and the first connecting pin is installed in the first through hole. The second end of the first connecting rod is sleeved on the top end of the first connecting pin. In the axial direction of the first piston, the first limiting pin connects the first piston and the first connecting pin.

[0013] The second compression assembly further includes a second connecting pin and a second limiting pin. The second piston has a second mounting hole in the axial direction and a second through hole in the radial direction. The second end of the second connecting rod is installed in the second mounting hole, and the second connecting pin is installed in the second through hole. The second end of the second connecting rod is sleeved on the bottom end of the second connecting pin. In the axial direction of the first piston, the second limiting pin connects the second piston and the second connecting pin.

[0014] In some embodiments, with the end face of the cylinder seat as the projection plane, the first end face of the first piston and the first end face of the second piston both face towards the crankshaft, and the second end face of the first piston and the second end face of the second piston both face away from the crankshaft; the cylinder seat has a shaft hole, and the crankshaft is vertically installed in the shaft hole; the line connecting the center of the crankshaft crank and the center of the shaft hole is a center line, and the length of the center line is R; the center of the shaft hole has a first horizontal line, and the angle between the center line and the first horizontal line is α; the first end of the first connecting rod is provided with a first crank sleeve hole, and the first connecting rod is sleeved on the connecting assembly through the first crank sleeve hole, and the distance between the center of the first crank sleeve hole and the center of the first connecting pin is... The distance between the first and second connecting rods is L1; the first end of the second connecting rod is provided with a second crank sleeve hole, and the second connecting rod is sleeved on the connecting assembly through the second crank sleeve hole. The distance between the center of the second crank sleeve hole and the center of the second connecting pin is L2; ​​the vertical distance between the center of the first through hole and the second end face of the first piston is a1, and the vertical distance between the center of the second through hole and the second end face of the second piston is a2; the first cylinder and the second cylinder are formed on the first end face of the cylinder seat, and the vertical distance between the center of the shaft hole and the first end face of the cylinder seat is H; the vertical distance between the centerline of the first cylinder and the first horizontal line is e1, and the vertical distance between the centerline of the second cylinder and the first horizontal line is e2;

[0015] The vertical distance between the second end face of the first piston and the center of the shaft hole is S1, and S1max is the maximum vertical distance between the second end face of the first piston and the center of the shaft hole. The vertical distance S1 satisfies: H+0.5mm≥S1max≥H;

[0016] The vertical distance between the second end face of the second piston and the center of the shaft hole is S2, and S2max is the maximum vertical distance between the second end face of the second piston and the center of the shaft hole. The vertical distance S2 satisfies: H+0.5mm≥S2max≥H.

[0017] The diameters D1 and D2 satisfy:

[0018] A compressor includes a pump body assembly, the pump body assembly being the pump body assembly described above.

[0019] A refrigerator includes a compressor, said compressor being the compressor described above.

[0020] The pump assembly, compressor, and refrigerator provided by this invention have the following beneficial effects:

[0021] The connecting assembly of this invention transmits the rotational motion of the crankshaft to the first and second connecting rods, thereby driving the pistons to reciprocate within the cylinders. This allows the crankshaft rotation to synchronously drive the two pistons, achieving coordinated operation. The connecting assembly also helps balance the overall mechanical distribution of the compressor. Since the first and second cylinders are positioned on the same side in the horizontal direction with parallel centerlines, this layout helps maintain the compressor's balance, reduces vibration, and improves operational stability and efficiency. This embodiment simplifies the assembly process by using the connecting assembly. If the first and second connecting rods were directly connected to the crankshaft, multiple eccentric parts would need to be installed on the crankshaft, increasing manufacturing difficulty and assembly complexity. Using the connecting assembly simplifies the crankshaft structure, making it easier to manufacture and maintain. Compared to two or more cylinders facing each other, which is disadvantageous for assembly, arranging two cylinders vertically on the same side requires two eccentric parts on the crankshaft components, making piston and connecting rod assembly on the cylinders quite difficult. This embodiment effectively avoids these problems by using the connecting assembly, making the compressor's design and manufacturing more flexible and convenient. Attached Figure Description

[0022] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0023] Figure 1 This is an exploded view of the pump body assembly according to an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram showing the connection between the connecting component and the first and second connecting rods according to an embodiment of the present invention;

[0025] Figure 3 This is a cross-sectional view of the first link and the second link according to an embodiment of the present invention;

[0026] Figure 4 This is an exploded view of the connecting component, the first link, and the second link according to an embodiment of the present invention;

[0027] Figure 5 This refers to the cylinder seat end face in an embodiment of the present invention;

[0028] Figure 6 for Figure 5 Sectional view at point AA;

[0029] Figure 7 for Figure 5Sectional view at point BB.

[0030] Attached Figures: 1-Cylinder seat; 11-First cylinder; 12-Second cylinder; 2-Connecting assembly; 201-Connecting sleeve; 211-Thrust boss; 202-Intermediate bearing; 3-Crankshaft; 4-First compression assembly; 401-First connecting rod; 41-First end of first connecting rod; 42-Second end of first connecting rod; 411-First collar; 412-First connecting ring; 402-First piston; 403-First connecting pin; 404-First limiting pin; 405-First through hole; 5-Second compression assembly; 501-Second connecting rod; 51-First end of second connecting rod; 511-Second collar; 512-Second connecting ring; 52-Second end of second connecting rod; 502-Second piston; 503-Second connecting pin; 504-Second limiting pin; 505-Second through hole; 6-Bearing assembly. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0033] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0034] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0035] See also Figures 1 to 3 As shown, according to an embodiment of the present invention, a pump body assembly is provided, which includes a cylinder seat 1, a connecting assembly 2, a crankshaft 3, a first compression assembly 4, and a second compression assembly 5; the cylinder seat 1 is provided with at least a first cylinder 11 and a second cylinder 12, the first cylinder 11 and the second cylinder 12 are arranged on the same side in the horizontal direction, and the center lines of the first cylinder 11 and the second cylinder 12 are parallel to each other; the first compression assembly 4 includes a first connecting rod 401 and a first piston 402, the first piston 402 being slidably disposed in the first cylinder 11; the second compression assembly 5 includes a second connecting rod 501 and a second piston 502, the second piston 502 being slidably disposed in the second cylinder 12; the crankshaft 3 is disposed in the cylinder seat 1, the connecting assembly 2 is connected to the crankshaft 3, the first end 41 of the first connecting rod 401 and the first end 51 of the second connecting rod 501 are respectively connected to the connecting assembly 2, the second end 42 of the first connecting rod 401 is connected to the first piston 402, and the second end 52 of the second connecting rod 501 is connected to the second piston 502.

[0036] Specifically, crankshaft 3 is installed in cylinder seat 1, bearing assembly 6 is sleeved on crankshaft 3, connecting assembly 2 is connected to crankshaft 3, and during the rotation of crankshaft 3, connecting assembly 2 is driven to rotate synchronously. The first end 41 of the first connecting rod 401 is connected to connecting assembly 2, and the second end 42 of the first connecting rod 401 is connected to the first piston 402. The first piston 402 is slidably disposed in the first cylinder 11. The first end 51 of the second connecting rod 501 is connected to connecting assembly 2, and the second end 52 of the second connecting rod 501 is connected to the second piston 502. The second piston 502 is slidably disposed in the second cylinder 12. During the rotation of connecting assembly 2, the first connecting rod 401 and the second connecting rod 501 are driven simultaneously, thereby converting the rotational motion of crankshaft 3 into the reciprocating motion of pistons, and the center lines of the first piston 402 and the second piston 502 are parallel.

[0037] In this embodiment, the connecting assembly 2 transmits the rotational motion of the crankshaft 3 to the first connecting rod 401 and the second connecting rod 501, thereby driving the piston to reciprocate in the cylinder. This allows the rotation of the crankshaft 3 to synchronously drive the two pistons, achieving coordinated operation. The connecting assembly 2 helps balance the mechanical distribution of the entire compressor. Since the first cylinder 11 and the second cylinder 12 are arranged on the same side in the horizontal direction and their center lines are parallel to each other, this layout helps maintain the balance of the compressor, reduces vibration, and improves operational stability and efficiency. This embodiment simplifies the assembly process by using the connecting assembly 2. If the first connecting rod 401 and the second connecting rod 501 were directly connected to the crankshaft 3, multiple eccentric parts would need to be provided on the crankshaft 3, which would increase the manufacturing difficulty and assembly complexity of the crankshaft 3. By using the connecting assembly 2, the structure of the crankshaft 3 can be simplified, making it easier to manufacture and maintain. Compared to having two or more cylinders facing each other, which is not conducive to assembly, arranging two cylinders vertically on the same side requires two eccentric parts to be set on the crankshaft 3 component. Assembling pistons and connecting rods on the cylinders is quite difficult. This embodiment can effectively avoid these problems by setting the connecting component 2, making the design and manufacturing of the compressor more flexible and convenient.

[0038] See also Figures 1 to 3 As shown, in the axial direction of the crankshaft 3, the first end 41 of the first connecting rod 401 and the first end 51 of the second connecting rod 501 are overlapped on the connecting assembly 2.

[0039] Specifically, since the center lines of the first cylinder 11 and the second cylinder 12 are parallel to each other, that is, the first piston 402 and the second piston 502 are also parallel to each other during the interaction process, in order to avoid the movement interference of the first connecting rod 401 and the second connecting rod 501, the first end 41 of the first connecting rod 401 and the first end 51 of the second connecting rod 501 are overlapped, so that the first connecting rod 401 and the second connecting rod 501 extend in two directions.

[0040] In this embodiment, since the centerlines of the first cylinder 11 and the second cylinder 12 are parallel to each other, the first piston 402 and the second piston 502 are also parallel to each other during interaction. By making the first end 41 of the first connecting rod 401 and the first end 51 of the second connecting rod 501 overlap, interference between the two connecting rods during movement can be effectively avoided, ensuring the compactness of the internal structure of the compressor and the coordination of movement. The overlapping arrangement allows the two connecting rods to be laid out more efficiently in a limited space, which is beneficial for use in compressors with limited space. Moreover, the overlapping connecting rods can share the same connecting component 2, which helps to improve the rigidity of the entire compressor structure, reduce vibration and noise, thereby improving the operating efficiency and life of the compressor. Through the overlapping arrangement, the number and complexity of required parts can also be reduced, simplifying the manufacturing and assembly process and reducing production costs.

[0041] See also Figures 1 to 3 As shown, the connecting assembly 2 includes a connecting sleeve 201, which is connected to the crankshaft 3. The first end 41 of the first connecting rod 401 and the first end 51 of the second connecting rod 501 are both sleeved on the connecting sleeve 201.

[0042] Specifically, the connecting sleeve 201 is connected to the crankshaft 3. The first end 41 of the first connecting rod 401 is provided with a first collar 411, and the first end 51 of the second connecting rod 501 is provided with a second collar 511. The first collar 411 and the second collar 511 are sleeved on the connecting sleeve 201, and the first collar 411 and the second collar 511 are overlapped. When the crankshaft 3 rotates, the crankshaft 3 drives the connecting sleeve 201 to rotate, and the connecting sleeve 201 drives the first connecting rod 401 and the second connecting rod 501 to reciprocate. The first connecting rod 401 and the second connecting rod 501 rotate relative to the connecting sleeve 201, so that the first connecting rod 401 and the second connecting rod 501 drive the first piston 402 and the second piston 502 to move respectively.

[0043] In this embodiment, by using the connecting sleeve 201, multiple eccentric parts on the crankshaft 3 can be avoided, thereby simplifying the design and manufacturing of the crankshaft 3, improving production assembly efficiency, and reducing costs. Furthermore, if the first connecting rod 401 and the second connecting rod 501 were directly connected to the crankshaft 3, it would increase assembly complexity. The connecting sleeve 201 provides an intermediary, making the assembly process simpler, especially in space-constrained situations. The connecting sleeve 201 also allows the first connecting rod 401 and the second connecting rod 501 to rotate relative to the connecting sleeve 201, rather than being directly connected to the crankshaft 3, which helps improve the coordination of the movement of the first piston 402 and the second piston 502, ensuring that the two pistons can work synchronously and effectively. In addition, the design of the connecting sleeve 201 allows for maintenance or replacement of the first connecting rod 401 and the second connecting rod 501 without disassembling the entire crankshaft 3, simplifying the maintenance process and reducing maintenance costs.

[0044] See also Figures 1 to 3 As shown, the first connecting rod 401 is positioned above the second connecting rod 501. The connecting assembly 2 also includes an intermediate bearing 202, which is sleeved on the connecting sleeve 201. The lower end face of the first connecting rod 401 contacts the top surface of the intermediate bearing 202, and the upper end face of the second connecting rod 501 contacts the bottom surface of the intermediate bearing 202.

[0045] Specifically, the first end 41 of the first connecting rod 401 and the first end 51 of the second connecting rod 501 are overlapped. In this embodiment, the first connecting rod 401 is positioned above the second connecting rod 501. In other embodiments, their positions can be interchanged. After the first collar 411 of the first connecting rod 401 is fitted onto the connecting sleeve 201, the intermediate bearing 202 is fitted onto the connecting sleeve 201, and finally the second collar 511 of the second connecting rod 501 is fitted onto the connecting sleeve 201. At this time, the intermediate bearing 202 is located between the first collar 411 and the second collar 511. When the crankshaft 3 drives the connecting sleeve 201 to rotate, since the first connecting rod 401 and the second connecting rod 501 also rotate relative to the connecting sleeve 201, the lower end face of the first connecting rod 401 contacts the top surface of the intermediate bearing 202, and the upper end face of the second connecting rod 501 contacts the bottom surface of the intermediate bearing 202.

[0046] In this embodiment, the connecting sleeve 201 allows the first collar 411 and the second collar 511 to be fitted onto the connecting sleeve 201. This design improves the stability of the entire compressor structure. Furthermore, the intermediate bearing 202 provided between the first collar 411 and the second collar 511 prevents connection failure during pushing or use. The intermediate bearing 202 provides a stable contact surface for the first connecting rod 401 and the second connecting rod 501, reducing friction and wear between the first collar 411 and the second collar 511. This reduced friction helps improve the compressor's efficiency and lifespan. Moreover, the intermediate bearing 202 provides additional support, increasing the stability of the entire compressor structure.

[0047] In one specific implementation, the intermediate bearing 202 includes a cage and balls, with the lower end face of the first connecting rod 401 and the upper end face of the second connecting rod 501 in ball contact. Ball bearings utilize rolling friction instead of traditional sliding friction, which significantly reduces friction during the connecting rod's movement. Since the coefficient of rolling friction is much smaller than the coefficient of sliding friction, this design helps reduce energy loss and improve compressor efficiency. The cage evenly distributes the balls between the lower end face of the first connecting rod 401 and the upper end face of the second connecting rod 501, ensuring uniform load distribution on the bearing contact surface, reducing localized stress concentration, and extending bearing life.

[0048] See also Figures 1 to 3 As shown, the top end of the connecting sleeve 201 is provided with a thrust boss 211. The first connecting rod 401, the intermediate bearing 202, and the second connecting rod 501 are sequentially sleeved on the connecting sleeve 201. The top surface of the first connecting rod 401 is connected to the thrust boss 211. The bottom end of the connecting sleeve 201 abuts against the eccentric part of the crankshaft 3.

[0049] Specifically, the crankshaft 3 has an eccentric portion at its top, and a crank is mounted on the eccentric portion. Before installing the connecting sleeve 201, the first collar 411 of the first connecting rod 401 is first fitted onto the connecting sleeve 201, with the top surface of the first collar 411 abutting against the thrust boss 211. The intermediate bearing 202 is then fitted onto the connecting sleeve 201, and the collar of the second connecting rod 501 is then fitted onto the connecting sleeve 201. After the first connecting rod 401 and the second connecting rod 501 are installed with the connecting sleeve 201, the connecting sleeve 201 is then fitted onto the crank, with the bottom end of the connecting sleeve abutting against the eccentric portion.

[0050] In this embodiment, the thrust boss 211 provides an axial positioning surface for the first connecting rod 401, ensuring the correct position of the first connecting rod 401 within the connecting sleeve 201 and preventing axial displacement. During compressor operation, the connecting rod and piston are subjected to axial forces generated by gas pressure. The thrust boss 211, connected to the top surface of the first connecting rod 401, can transmit and withstand these axial forces, thereby protecting the connecting sleeve 201 from damage by axial forces. The thrust boss 211 can also serve as a support point for the intermediate bearing 202. When the intermediate bearing 202 is located between the first connecting rod 401 and the second connecting rod 501, the thrust boss 211 can provide additional support, enhancing the structural rigidity of the connecting sleeve 201 and helping to reduce deformation under high load or high-speed operating conditions, thereby improving the overall performance and reliability of the compressor.

[0051] In one specific implementation, the outer diameter of the thrust boss 211 is d3, the outer diameter of the first collar 411 of the first connecting rod 401 is the same as the outer diameter of the connecting sleeve 201, both being d1, the inner diameter of the connecting sleeve 201 is d2, and the diameter d3 is greater than d1.

[0052] See also Figures 1 to 3 As shown, the axial extension directions of the first connecting rod 401 and the second connecting rod 501 are perpendicular to the axis of the crankshaft 3. The second end 42 of the first connecting rod 401 is rotatably connected to the first piston 402, and the second end 52 of the second connecting rod 501 is rotatably connected to the second piston 502.

[0053] Specifically, the first end 41 of the first connecting rod 401 and the first end 51 of the second connecting rod 501 can rotate relative to the connecting sleeve 201. In the compressor, the piston needs to reciprocate in the cylinder to compress the gas. One end of the connecting rod is rotatably connected to the piston, so that the piston can move freely back and forth in the cylinder, while the other end is rotatably connected to the connecting sleeve 201, so that the rotational motion of the crankshaft 3 can be converted into the reciprocating motion of the piston.

[0054] In this embodiment, the rotary connection allows the first connecting rod 401 and the second connecting rod 501 to move without bearing lateral forces, reducing friction and wear between the connecting rod and the piston or connecting sleeve 201. The rotary connection can more precisely control the movement of the piston, ensuring that the piston moves evenly and stably in the cylinder. Moreover, the rotary connection can more effectively transmit the rotational power of the crankshaft 3 to the piston, while allowing the first connecting rod 401 and the second connecting rod 501 to rotate freely during the rotation of the crankshaft 3, which helps to optimize the force transmission efficiency.

[0055] See also Figures 1 to 3As shown, the first compression assembly 4 also includes a first connecting pin 403 and a first limiting pin 404. A first mounting hole is provided in the axial direction of the first piston 402, and a first through hole 405 is provided in the radial direction of the first piston 402. The second end 42 of the first connecting rod 401 is installed in the first mounting hole, and the first connecting pin 403 is installed in the first through hole 405. The second end 42 of the first connecting rod 401 is sleeved on the top end of the first connecting pin 403. In the axial direction of the first piston 402, the first limiting pin 404 connects the first piston 402 and the first connecting pin 404. 3; The second compression assembly 5 also includes a second connecting pin 503 and a second limiting pin 504. The second piston 502 is provided with a second mounting hole in the axial direction and a second through hole 505 in the radial direction. The second end 52 of the second connecting rod 501 is installed in the second mounting hole, and the second connecting pin 503 is installed in the second through hole 505. The second end 52 of the second connecting rod 501 is sleeved on the bottom end of the second connecting pin 503. In the axial direction of the first piston 402, the second limiting pin 504 connects the second piston 502 and the second connecting pin 503.

[0056] Specifically, the second end 42 of the first connecting rod 401 is provided with a first connecting ring 412, and the second end 52 of the second connecting rod 501 is provided with a second connecting ring 512. After the first connecting ring 412 of the first connecting rod 401 is installed in the first mounting hole, the first connecting pin 403 is installed vertically into the first through hole 405. The first connecting pin 403 passes through the first connecting ring 412 of the first connecting rod 401, that is, the first connecting ring 412 of the first connecting rod 401 is fixed in the first mounting hole. Then, the first limiting pin 404 is inserted laterally into the first piston 402, thereby connecting the first piston 402 and the first connecting pin 403. Similarly, the installation of the second connecting rod 501 and the second piston 502 is the same as the installation process of the first connecting rod 401 and the first piston 402.

[0057] In this embodiment, the connecting pin and the limiting pin are used to fix the relative position of the connecting rod and the piston, limiting their displacement during installation and operation. This ensures that the connecting rod and the piston are correctly installed and aligned within the compressor cylinder. Precise positioning is crucial for the efficient operation of the compressor, ensuring smooth reciprocating motion of the piston within the cylinder. Furthermore, the combined action of the limiting pin and the positioning pin improves the compressor's stability during operation, reducing component misalignment or damage caused by vibration or impact. The connecting pin and the limiting pin make the first connecting rod 401 and the second connecting rod 501 easier to install and maintain. Moreover, the use of the positioning pin and the limiting pin enhances the compressor's structural strength, providing additional support and protection, especially under high pressure and high temperature conditions.

[0058] It is worth noting that when the pump body is assembled, the lower end face of the pin hole of the second connecting rod 501 contacts the lower end face inside the second piston 502 to support the overlapping connecting assembly 2. The lower end face of the pin hole of the first connecting rod 401 should contact or maintain a certain gap with the upper end face inside the first piston 402 to ensure that the first connecting rod 401 and the second connecting rod 501 can be smoothly assembled with the connecting sleeve 201.

[0059] See also Figures 4 to 7 As shown, with the end face of cylinder seat 1 as the projection plane, the first end face of the first piston 402 and the first end face of the second piston 502 both face the crankshaft 3, and the second end faces of the first piston 402 and the second piston 502 both face away from the crankshaft 3; cylinder seat 1 has a shaft hole, and crankshaft 3 is vertically installed in the shaft hole; the line connecting the center of crankshaft 3 and the center of shaft hole is the center line, and the length of the center line is R; the center of shaft hole has a first horizontal line, and the angle between the center line and the first horizontal line is α; the first end 41 of the first connecting rod 401 is provided with a first crank sleeve hole, and the first connecting rod 401 is sleeved on the connecting assembly 2 through the first crank sleeve hole, and the distance between the center of the first crank sleeve hole and the center of the first connecting pin 403 is L1; the second connecting rod 502 and the first piston 402 both face the crankshaft 3, and the first piston 402 and the second piston 502 both face away from the crankshaft 3; the second connecting rod 502 and the second piston 502 both face the crankshaft 3, ... The first end 51 of 01 is provided with a second crank sleeve hole, and the second connecting rod 501 is sleeved on the connecting assembly 2 through the second crank sleeve hole. The distance between the center of the second crank sleeve hole and the center of the second connecting pin 503 is L2. The vertical distance between the center of the first through hole 405 and the second end face of the first piston 402 is a1, and the vertical distance between the center of the second through hole 505 and the second end face of the second piston 502 is a2. The first cylinder 11 and the second cylinder 12 are opened on the first end face of the cylinder seat 1. The vertical distance between the center of the shaft hole and the first end face of the cylinder seat 1 is H. The vertical distance between the centerline of the first cylinder 11 and the first horizontal line is e1, and the vertical distance between the centerline of the second cylinder 12 and the first horizontal line is e2.

[0060] Specifically, the vertical distance between the second end face of the first piston 402 and the center of the shaft hole is S1, and the vertical distance S1 satisfies: S1max is the maximum vertical distance between the second end face of the first piston 402 and the center of the shaft hole 101, H+0.5mm≥S1max≥H;

[0061] Specifically, the vertical distance between the second end face of the second piston 502 and the center of the shaft hole is S2, and S2max is the maximum vertical distance between the second end face of the second piston 502 and the center of the shaft hole 101. The vertical distance S2 satisfies: H+0.5mm≥S2max≥H.

[0062] In this embodiment, the selection of the above parameters is determined by the stroke of the first piston 402 and the second piston 502. Specifically, the stroke of the second end face of the first piston 402 and the second end face of the second piston 502 is determined by the specific parameters of the crankshaft, connecting rod, cylinder seat, piston, etc. The parameters involved in the formula are all related to the stroke of the piston front face, i.e., the vertical distances S1 and S2, in the aforementioned parts. When the length R increases, the maximum value of the vertical distances S1 and S2 increases, and the minimum value decreases. The stroke of the piston front face, i.e., S1max-S1min and S2max-S2min, will increase. When the vertical distances a1 and a2 increase, the vertical distances S1 and S2 increase, but the piston front face stroke remains unchanged. When the distances L1 and L2 increase, the vertical distances S1 and S2 increase, but the piston front face stroke decreases. When the vertical distances e1 and e2 increase, the vertical distances S1 and S2 decrease, but the piston front face stroke increases. The magnitudes of vertical distances S1 and S2 are related to multiple parameters, and these parameters change during the rotation of crankshaft 3. Therefore, by limiting vertical distances S1 and S2, the correct position and movement of the piston within the cylinder can be ensured, which in turn determines the piston stroke, i.e., the maximum distance the piston can move from one end of the cylinder to the other. The parameters involved in the formula all affect the gas compression ratio and the performance of the compressor. By precisely controlling vertical distances S1 and S2, the compression efficiency of the compressor can be optimized. Furthermore, by adjusting vertical distances S1 and S2, the compressor can adapt to different working conditions and requirements, such as different pressure and temperature ranges.

[0063] It is worth noting that as the angle α between the line connecting the centers of crankshaft 312 and the shaft changes, the vertical distance S1 will have a maximum and a minimum value, and the vertical distance S2 will also have a maximum and a minimum value. The effective stroke of the first piston 402 and the second piston 502 is the difference between the maximum and minimum values. Vertical distances S1 and S2 are the vertical distances between the second end faces of the first piston 402 and the second piston 502 and the center of the shaft hole, which can be understood as the motion equations of the two piston front face faces. Even when the structure is approximated, by adjusting the structural parameters involved in the formula, the vertical distances S1 and S2 still conform to the above equation.

[0064] See also Figures 4 to 7 As shown, the diameter of the first piston 402 is D1, and the diameter of the second piston 502 is D2. The diameters D1 and D2 satisfy the following:

[0065] In this embodiment, the vertical distances S1 and S2 are defined to determine the distance H between the first end face of the cylinder seat 1 and the distance H, so as to ensure that the two pistons have a certain amount of protrusion when they run to the maximum stroke, and to ensure complete exhaust. The relationship between the diameters D1 and D2 and the vertical distances e1 and e2 is defined to prevent the two cylinder bores from being designed too large, exceeding the total length of the vertical distances e1 and e2, which would cause the two cylinder bores to overlap.

[0066] A compressor includes a pump body assembly, the pump body assembly being the pump body assembly described above.

[0067] A refrigerator includes a compressor, wherein the compressor is the compressor described above.

[0068] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0069] 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 should be included within the protection scope of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A pump body assembly, characterized in that, include: Cylinder housing (1), connecting assembly (2), crankshaft (3), first compression assembly (4), and second compression assembly (5); The cylinder seat (1) is provided with at least a first cylinder (11) and a second cylinder (12), the first cylinder (11) and the second cylinder (12) are arranged on the same side in the horizontal direction, and the center line of the first cylinder (11) and the center line of the second cylinder (12) are parallel to each other; the first compression assembly (4) includes a first connecting rod (401) and a first piston (402), the first piston (402) is slidably disposed in the first cylinder (11); the second compression assembly (5) includes a second connecting rod (501) and a second piston (502), the second piston (502) is slidably disposed in the second cylinder (12); The crankshaft (3) is disposed in the cylinder seat (1), the connecting assembly (2) is connected to the crankshaft (3), the first end (41) of the first connecting rod (401) and the first end (51) of the second connecting rod (501) are respectively connected to the connecting assembly (2), the second end (42) of the first connecting rod (401) is connected to the first piston (402), and the second end (52) of the second connecting rod (501) is connected to the second piston (502); In the axial direction of the crankshaft (3), the first end (41) of the first connecting rod (401) and the first end (51) of the second connecting rod (501) are overlapped on the connecting assembly (2); the axial extension direction of the first connecting rod (401) and the second connecting rod (501) is perpendicular to the axis of the crankshaft (3); the second end (42) of the first connecting rod (401) is rotatably connected to the first piston (402); and the second end (52) of the second connecting rod (501) is rotatably connected to the second piston (502). The first compression assembly (4) further includes a first connecting pin (403) and a first limiting pin (404). The first piston (402) has a first mounting hole in the axial direction and a first through hole (405) in the radial direction. The second end (42) of the first connecting rod (401) is installed in the first mounting hole, and the first connecting pin (403) is installed in the first through hole (405). The second end (42) of the first connecting rod (401) is sleeved on the top end of the first connecting pin (403). In the axial direction of the first piston (402), the first limiting pin (404) connects the first piston (402) and the first connecting pin (403). The second compression assembly (5) further includes a second connecting pin (503) and a second limiting pin (504). The second piston (502) has a second mounting hole in the axial direction and a second through hole (505) in the radial direction. The second end (52) of the second connecting rod (501) is installed in the second mounting hole, and the second connecting pin (503) is installed in the second through hole (505). The second end (52) of the second connecting rod (501) is sleeved on the bottom end of the second connecting pin (503). In the axial direction of the second piston (502), the second limiting pin (504) connects the second piston (502) and the second connecting pin (503).

2. The pump body assembly according to claim 1, characterized in that, The connecting assembly (2) includes a connecting sleeve (201), which is connected to the crankshaft (3). The first end (41) of the first connecting rod (401) and the first end (51) of the second connecting rod (501) are both sleeved on the connecting sleeve (201).

3. The pump body assembly according to claim 2, characterized in that, The first connecting rod (401) is disposed above the second connecting rod (501). The connecting assembly (2) further includes an intermediate bearing (202), which is sleeved on the connecting sleeve (201). The lower end face of the first connecting rod (401) contacts the top surface of the intermediate bearing (202), and the upper end face of the second connecting rod (501) contacts the bottom surface of the intermediate bearing (202).

4. The pump body assembly according to claim 3, characterized in that, The top end of the connecting sleeve (201) is provided with a thrust boss (211). The first connecting rod (401), the intermediate bearing (202) and the second connecting rod (501) are sequentially sleeved on the connecting sleeve (201). The top surface of the first connecting rod (401) is connected to the thrust boss (211). The bottom end of the connecting sleeve (201) abuts against the eccentric part of the crankshaft (3).

5. The pump body assembly according to claim 1, characterized in that, With the end face of the cylinder seat (1) as the projection plane, the first end face of the first piston (402) and the first end face of the second piston (502) both face the crankshaft (3), and the second end face of the first piston (402) and the second end face of the second piston (502) both face away from the crankshaft (3); the cylinder seat (1) is provided with a shaft hole (101), and the crankshaft (3) is vertically installed in the shaft hole (101); the line connecting the crank center of the crankshaft (3) and the center of the shaft hole (101) is the center line, and the length of the center line is R; the center of the shaft hole (101) has a first horizontal line, and the angle between the center line and the first horizontal line is α; the first end (41) of the first connecting rod (401) is provided with a first crank sleeve hole, and the first connecting rod (401) is sleeved on the connecting assembly (2) through the first crank sleeve hole, and the center of the first crank sleeve hole and the center of the first connecting pin (403) are respectively... The distance is L1; the first end (51) of the second connecting rod (501) is provided with a second crank sleeve hole, and the second connecting rod (501) is sleeved on the connecting assembly (2) through the second crank sleeve hole. The distance between the center of the second crank sleeve hole and the center of the second connecting pin (503) is L2; ​​the vertical distance between the center of the first through hole (405) and the second end face of the first piston (402) is a1, and the vertical distance between the center of the second through hole (505) and the second end face of the second piston (502) is a2; the first cylinder (11) and the second cylinder (12) are opened on the first end face of the cylinder seat (1), and the vertical distance between the center of the shaft hole (101) and the first end face of the cylinder seat (1) is H; the vertical distance between the center line of the first cylinder (11) and the first horizontal line is e1, and the vertical distance between the center line of the second cylinder (12) and the first horizontal line is e2; The vertical distance between the second end face of the first piston (402) and the center of the shaft hole (101) is S1, and S1max is the maximum vertical distance between the second end face of the first piston (402) and the center of the shaft hole (101). The vertical distance S1 satisfies: H+0.5mm≥S1max≥H; The vertical distance between the second end face of the second piston (502) and the center of the shaft hole (101) is S2, and S2max is the maximum vertical distance between the second end face of the second piston (502) and the center of the shaft hole (101). The vertical distance S2 satisfies: H+0.5mm≥S2max≥H.

6. The pump body assembly according to claim 5, characterized in that, The diameter of the first piston (402) is D1, and the diameter of the second piston (502) is D2. The diameters D1 and D2 satisfy: .

7. A compressor, comprising a pump body assembly, characterized in that, The pump assembly is the pump assembly according to any one of claims 1 to 6.

8. A refrigerator, comprising a compressor, characterized in that, The compressor is the compressor described in claim 7.

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