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 seat, a crankshaft, and 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 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, and the second compression assembly includes a second connecting rod and a second piston. The connecting seat is connected to the crankshaft. The first ends of the first and second connecting rods are rotatably connected to the connecting seat, and the second ends of the first and second connecting rods are connected to the first and second pistons, respectively. The first ends of the two connecting rods are rotatably connected to the connecting seat, allowing two compression assemblies to be arranged in a limited space. By using the connecting seat, the structure of the crankshaft is simplified, making assembly easier.

Description

Technical Field

[0001] This invention belongs to the field of refrigerator 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 seat, 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, which 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, which is slidably disposed in the first cylinder; the second compression assembly includes a second connecting rod and a second piston, which is slidably disposed in the second cylinder.

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

[0008] In some embodiments, the second link includes a locking block disposed on the second end of the second link, and the second piston is provided with a locking groove in which the locking block is embedded.

[0009] In some embodiments, the snap-fit ​​groove includes a mounting groove and a connecting groove, which are formed on the outer peripheral wall of the second piston. The end face of the second piston facing the second connecting rod is the first end face. One end of the connecting groove is connected to the mounting groove, and the other end of the connecting groove passes through the first end face. The snap-fit ​​block is embedded in the mounting groove, and a portion of the second connecting rod is embedded in the connecting groove.

[0010] In some embodiments, the connecting seat includes a connecting sleeve, a first flange, and a second flange. The connecting sleeve is connected to the crankshaft. The first flange and the second flange are disposed on the outer peripheral wall of the connecting sleeve. The first flange and the second flange are disposed on the same side in the horizontal direction. The first end of the first connecting rod is rotatably connected to the first flange, and the first end of the second connecting rod is rotatably connected to the second flange.

[0011] In some embodiments, a first collar is provided at the first end of the first connecting rod, and a first rotating groove is formed on the outer peripheral wall of the first flange, in which the first collar is installed; a second collar is provided at the first end of the second connecting rod, and a second rotating groove is formed on the outer peripheral wall of the second flange, in which the second collar is installed.

[0012] In some embodiments, a first connecting component and a second connecting component are also included. The first connecting component includes a first mounting pin and a first positioning pin. Along the axial direction of the crankshaft, a first flange is provided with a first pin hole. The first mounting pin passes through a first collar and is installed in the first pin hole. The first positioning pin connects the first mounting pin and the first flange.

[0013] The second connecting assembly includes a second mounting pin and a second positioning pin. Along the axial direction of the crankshaft, the second flange is provided with a second pin hole. The second mounting pin passes through the second collar and is installed in the second pin hole. The second positioning pin connects the second mounting pin and the second flange.

[0014] In some embodiments, the end face of the cylinder seat is used as the projection plane. 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 and the center of the shaft hole is the 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 connecting seat includes a connecting sleeve, which is connected to the crankshaft. The line connecting the center of the connecting sleeve to the center of the first pin hole is the first line, and the length of the first line is F1. The line connecting the center of the connecting sleeve to the center of the second pin hole is the second line, and the length of the second line is F2. The angle between the first line and the second line is θ. A first connecting ring is provided at the second end of the first connecting rod. The distance from the center of the first ring to the center of the first connecting ring is L1, and the distance from the center of the second ring to the second end face of the second connecting rod is L2. The first end face of the first piston and the first end face of the second piston both face 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 piston is connected to the first connecting rod via a first connecting pin. The vertical distance between the center of the pin hole of the first piston and the second end face of the first piston is a1. The second piston is provided with a snap-fit ​​groove, and the vertical distance between the inner wall of the snap-fit ​​groove and the second end face of the second piston is a2. The first cylinder and the second cylinder are formed on the wall of the cylinder seat. The vertical distance between the center of the shaft hole and the wall 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. The second end faces of the first piston and the second end faces of the second piston are both away from the crankshaft. 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 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 S1 satisfies:

[0015] H+0.5mm≥S1max≥H;

[0016] The vertical distance S2 satisfies:

[0017]

[0018] H+0.5mm≥S2max≥H.

[0019] In some embodiments, the diameter of the first piston is D1, and the diameter of the second piston is D2, wherein diameters D1 and D2 satisfy:

[0020] A compressor includes a pump body assembly, the pump body assembly being the pump body assembly described above.

[0021] A refrigerator includes a compressor, wherein the compressor is the compressor described above.

[0022] The pump assembly, compressor, and refrigerator provided by this invention have the following beneficial effects:

[0023] This invention allows for the arrangement of two compression components within a limited space by rotatably connecting the first ends of two connecting rods to a connecting seat. It also ensures a certain degree of flexibility for both the first and second connecting rods. The connecting seat transmits the rotational motion of the crankshaft to the first and second connecting rods, thereby driving the pistons to reciprocate within the cylinders. This ensures that the crankshaft's rotation synchronously drives the two pistons, achieving coordinated operation. The connecting seat 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, improving operational stability and efficiency. This embodiment simplifies the assembly process by using a connecting seat. 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. By using a connecting seat, the crankshaft structure is 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 component. Assembling pistons and connecting rods on the cylinders is quite difficult. This embodiment can effectively avoid these problems by setting a connecting seat, making the design and manufacturing of the compressor more flexible and convenient. Attached Figure Description

[0024] 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.

[0025] Figure 1 This is a schematic diagram of the pump body assembly according to an embodiment of the present invention;

[0026] Figure 2 This is an exploded view of the first link, the second link, and the connecting seat according to an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the mounting slot according to an embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of an oil storage tank according to an embodiment of the present invention;

[0029] Figure 5This is a schematic diagram of the connector according to an embodiment of the present invention;

[0030] Figure 6 This is a schematic diagram of the first compression component and the second compression component according to an embodiment of the present invention;

[0031] Figure 7 This is a schematic diagram of the end face of the cylinder seat according to an embodiment of the present invention;

[0032] Attached Figures: 1-Cylinder seat; 101-First cylinder; 102-Second cylinder; 103-Shaft hole; 2-Connecting seat; 201-Connecting sleeve; 202-First flange; 221-First rotary groove; 203-Second flange; 231-Second rotary groove; 3-First compression assembly; 301-First connecting rod; 311-First collar; 312-First connecting ring; 313-First connecting pin; 314-First limiting pin; 302-First piston; 4-Second compression assembly; 401-Second connecting rod; 411-Second collar; 412-Clamping block; 402-Second piston; 421-Clamping groove; 422-Mounting groove; 423-Connecting groove; 424-First end face; 425-Oil reservoir; 5-First connecting assembly; 501-First mounting pin; 502-First locating pin; 503-First pin hole; 6-Second connecting assembly; 601-Second mounting pin; 602-Second locating pin; 603-Second pin hole; 7-Crankshaft; 8-Bearing assembly. Detailed Implementation

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] See also Figures 1 to 2 As shown, according to an embodiment of the present invention, a pump body assembly is provided, including a cylinder seat 1, a connecting seat 2, a crankshaft 7, a first compression assembly 3, and a second compression assembly 4; the cylinder seat 1 is provided with at least a first cylinder 101 and a second cylinder 102, the first cylinder 101 and the second cylinder 102 are arranged on the same side in the horizontal direction, and the center lines of the first cylinder 101 and the second cylinder 102 are parallel to each other; the first compression assembly 3 includes a first connecting rod 301 and a first piston 302, the first piston 302 being slidably disposed in the first cylinder 101; the second compression assembly 4 includes a second connecting rod 401 and a second piston 402, the second piston 402 being slidably disposed in the second cylinder 102; the crankshaft 7 is disposed in the cylinder seat 1, the connecting seat 2 is connected to the crankshaft 7, the first end of the first connecting rod 301 and the first end of the second connecting rod 401 are respectively rotatably connected to the connecting seat 2, the second end of the first connecting rod 301 is connected to the first piston 302, and the second end of the second connecting rod 401 is connected to the second piston 402.

[0038] Specifically, crankshaft 7 is installed in cylinder seat 1, bearing assembly 8 is sleeved on crankshaft 7, connecting seat 2 is connected to crankshaft 7, and connecting seat 2 rotates synchronously during crankshaft 7 rotation. The first end of first connecting rod 301 is rotatably connected to connecting seat 2, and the second end of first connecting rod 301 is connected to first piston 302. First piston 302 is slidably disposed in first cylinder 101. The first end of second connecting rod 401 is rotatably connected to connecting seat 2, and the second end of second connecting rod 401 is connected to second piston 402. Second piston 402 is slidably disposed in second cylinder 102. During the rotation of connecting seat 2, first connecting rod 301 and second connecting rod 401 are driven simultaneously, thereby converting the rotational motion of crankshaft 7 into the reciprocating motion of piston, and the center line of first piston 302 and center line of second piston 402 are parallel.

[0039] In this embodiment, by rotatably connecting the first ends of the two connecting rods to the connecting seat 2, two compression components can be arranged within a limited space, while ensuring that the first connecting rod 301 and the second connecting rod 401 have a certain degree of flexibility. The connecting seat 2 transmits the rotational motion of the crankshaft 7 to the first connecting rod 301 and the second connecting rod 401, thereby driving the piston to reciprocate in the cylinder. This allows the rotation of the crankshaft 7 to synchronously drive the two pistons, achieving coordinated operation. The connecting seat 2 helps to balance the mechanical distribution of the entire compressor. Since the first cylinder 101 and the second cylinder 102 are arranged on the same side in the horizontal direction and their center lines are parallel to each other, this layout helps to maintain the balance of the compressor and improve the stability and efficiency of operation. In this embodiment, the connecting seat 2 simplifies the assembly process. If the first connecting rod 301 and the second connecting rod 401 are directly connected to the crankshaft 7, multiple eccentric parts will need to be set on the crankshaft 7, which will increase the manufacturing difficulty and assembly complexity of the crankshaft 7. By using the connecting seat 2, the structure of the crankshaft 7 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 7 component. Assembling pistons and connecting rods on the cylinders is quite difficult. This embodiment can effectively avoid these problems by setting the connecting seat 2, making the design and manufacturing of the compressor more flexible and convenient.

[0040] See also Figures 1 to 4 As shown, the second end of the first connecting rod 301 is rotatably connected to the first piston 302, and the second end of the second connecting rod 401 is locked to the second piston 402.

[0041] Specifically, when the crankshaft 7 rotates in the cylinder block 1, the crankshaft 7 drives the second ends of the first connecting rod 301 and the second connecting rod 401 to rotate synchronously through the connecting seat 2. The first connecting rod 301 and the second connecting rod 401 are respectively connected to the crankshaft 7 and the piston. The first end of the first connecting rod 301 is rotatably connected to the connecting seat 2, and the second end is rotatably connected to the first piston 302. Similarly, the first end of the second connecting rod 401 is rotatably connected to the connecting seat 2, and the second end is locked to the second piston 402. As the crankshaft 7 rotates, the reciprocating motion of the first connecting rod 301 and the second connecting rod 401 is transmitted to the first piston 302 and the second piston 402 respectively. Since the first piston 302 is rotatably connected to the first connecting rod 301, it can rotate slightly, while the second piston 402, due to its locked engagement with the second connecting rod 401, can only perform reciprocating linear motion. The second connecting rod 401 and the second piston 402 do not rotate relative to each other.

[0042] In this embodiment, the rotatable connection between the first connecting rod 301 and the first piston 302 provides a certain degree of freedom, while the locking engagement between the second connecting rod 401 and the second piston 402 ensures that the reciprocating motion of the piston is a precise linear motion. The locking engagement reduces the lateral movement of the second piston 402 in the second cylinder 102, thereby improving the compressor efficiency. The first connecting rod 301 and the second connecting rod 401, with their corresponding pistons, employ different connection methods, forming a more stable structure. The rotatable connection between the first connecting rod 301 and the first piston 302 provides a certain adjustment range, while the locking engagement between the second connecting rod 401 and the second piston 402 provides robust support, working together to improve the overall structural stability of the compressor.

[0043] See also Figures 1 to 4 As shown, the second connecting rod 401 includes a locking block 412, which is disposed on the second end of the second connecting rod 401. The second piston 402 is provided with a locking groove 421, and the locking block 412 is embedded in the locking groove 421.

[0044] In this embodiment, the engagement of the locking block 412 and the locking groove 421 provides a stable connection, making the connection between the second piston 402 and the second connecting rod 401 more secure and reducing the possibility of loosening during operation. Moreover, this connection method allows for quick assembly and disassembly, and the engagement of the locking block 412 and the locking groove 421 does not require additional tools or complex operations, making assembly convenient.

[0045] See also Figure 3As shown, the snap-fit ​​groove 421 includes a mounting groove 422 and a connecting groove 423. The mounting groove 422 and the connecting groove 423 are formed on the outer peripheral wall of the second piston 402. The end face of the second piston 402 facing the second connecting rod 401 is the first end face 424. One end of the connecting groove 423 is connected to the mounting groove 422, and the other end of the connecting groove 423 passes through the first end face 424. The snap-fit ​​block 412 is embedded in the mounting groove 422, and part of the second connecting rod 401 is embedded in the connecting groove 423.

[0046] Specifically, the mounting groove 422 and the connecting groove 423 are formed on the outer peripheral wall of the second piston 402. One end of the connecting groove 423 is connected to the mounting groove 422, and the other end of the connecting groove 423 passes through the first end face 424. When the second connecting rod 401 needs to be installed, the locking block 412 of the second connecting rod 401 is embedded in the mounting groove 422. In order for the locking block 412 to be fully installed in the mounting groove 422, a part of the second connecting rod 401 also needs to be connected to the second piston 402. The connecting groove 423 is equivalent to providing a clearance position. After the part of the second connecting rod 401 is installed in the connecting groove 423, the locking block 412 is installed as a whole in the mounting groove 422.

[0047] In this embodiment, a portion of the second connecting rod 401 is embedded in the communicating groove 423, allowing the second connecting rod 401 to smoothly connect with the second piston 402 during installation. Simultaneously, the locking block 412 can be fully inserted into the mounting groove 422. The mounting groove 422 and the communicating groove 423 enhance the connection stability between the second piston 402 and the second connecting rod 401. The locking block 412 is embedded in the mounting groove 422, while the connecting rod portion is embedded in the communicating groove 423; this double-embedded structure enhances overall stability and reliability. Furthermore, the engagement of the locking block 412 with the mounting groove 422 and the cooperation between the connecting rod portion and the communicating groove 423 restrict the movement of the second piston 402 and the second connecting rod 401, ensuring stability during operation and reducing the risk of damage due to vibration or impact. This connection method simplifies the assembly process, making the connection between the second connecting rod 401 and the second piston 402 more convenient and quick. If maintenance or component replacement is required, this connection method also facilitates disassembly, improving maintenance efficiency.

[0048] In one specific implementation, a first connecting ring 312 is provided at the second end of the first connecting rod 301. A first mounting pin hole is provided in the axial direction of the first piston 302, and a first through hole is provided in the radial direction of the first piston 302. The connecting ring is installed in the first mounting pin hole, and a first connecting pin 313 is installed in the first through hole, with the first connecting pin 313 passing through the first connecting ring 312. In the axial direction of the first piston 302, a first limiting pin 314 connects the first piston 302 and the first connecting pin 313. The connecting pin and the limiting pin are used to fix the relative position of the connecting rod and the piston, limiting the displacement of the connecting rod and the piston during installation and operation, ensuring that the connecting rod and the piston are correctly installed and aligned in the compressor cylinder. Precise positioning is crucial for the efficient operation of the compressor, ensuring smooth reciprocating motion of the piston in the cylinder. Furthermore, the combined action of the limiting pin and the positioning pin can improve the stability of the compressor during operation and reduce component misalignment or damage caused by vibration or impact.

[0049] In one specific implementation, the outer peripheral walls of the second piston 402 and the first piston 302 are provided with annular oil reservoirs 425, which serve as lubricants to reduce the friction between the first piston 302, the second piston 402 and the cylinder.

[0050] See also Figures 1 to 5 As shown, the connecting seat 2 includes a connecting sleeve 201, a first flange 202 and a second flange 203. The connecting sleeve 201 is connected to the crankshaft 7. The first flange 202 and the second flange 203 are disposed on the outer peripheral wall of the connecting sleeve 201. The first flange 202 and the second flange 203 are disposed on the same side in the horizontal direction. The first end of the first connecting rod 301 is rotatably connected to the first flange 202, and the first end of the second connecting rod 401 is rotatably connected to the second flange 203.

[0051] Specifically, the top of the crankshaft 7 is provided with an eccentric part, and a crank is provided on the eccentric part. The connecting sleeve 201 is sleeved on the crank. Since the first flange 202 and the second flange 203 are provided on the outer peripheral wall of the connecting sleeve 201, it is equivalent to the first connecting rod 301 and the second connecting rod 401 being laterally connected to the connecting seat 2. The crankshaft 7 rotates in the cylinder seat 1. This rotational motion is the starting point of the entire pump body assembly's motion process. The connecting sleeve 201 is connected to the crankshaft 7. The rotation of the crankshaft 7 directly drives the connecting sleeve 201 to rotate. The first flange 202 and the second flange 203 on the connecting sleeve 201 rotate synchronously. Since the first end of the first connecting rod 301 is rotatably connected to the first flange 202, and the first end of the second connecting rod 401 is rotatably connected to the second flange 203, when the first flange 202 and the second flange 203 rotate with the connecting sleeve 201, the first ends of the first connecting rod 301 and the second connecting rod 401 will also rotate accordingly. The rotational motion of the first connecting rod 301 and the second connecting rod 401 is converted into the reciprocating motion of the pistons. The second end of the first connecting rod 301 is connected to the first piston 302, and the second end of the second connecting rod 401 is connected to the second piston 402. When the first connecting rod 301 and the second connecting rod 401 rotate, the reciprocating motion of the connecting rods drives the first piston 302 and the second piston 402 to move back and forth in their respective cylinders. The reciprocating motion of the first piston 302 and the second piston 402 in the cylinders realizes the intake and compression of gas. During the compression process, the piston compresses the gas, and during the intake process, the piston re-intakes the gas. The continuous rotation of the crankshaft 7 causes the above motion process to cycle continuously, thereby realizing the continuous operation of the compressor.

[0052] In this embodiment, the first flange 202 and the second flange 203 are disposed on the outer periphery of the connecting sleeve 201, which makes the structure of the entire connecting seat 2 more compact and saves space. Furthermore, since the connection point between the flange and the connecting rod is closer to the rotation center of the crankshaft 7, the length of the first connecting rod 301 and the second connecting rod 401 during force transmission can be reduced, improving force transmission efficiency. In addition, the placement of the first flange 202 and the second flange 203 increases the rigidity of the connecting seat 2, enabling it to maintain better shape and positional stability when operating under high loads or high pressures.

[0053] See also Figures 1 to 6 As shown, the first end of the first connecting rod 301 is provided with a first collar 311, and the outer peripheral wall of the first flange 202 is provided with a radially inward first rotary groove 221, in which the first collar 311 is installed; the first end of the second connecting rod 401 is provided with a second collar 411, and the outer peripheral wall of the second flange 203 is provided with a radially inward second rotary groove 231, in which the second collar 411 is installed.

[0054] Specifically, the first ring 311 is installed in the first rotary groove 221, and the second ring 411 is installed in the second rotary groove 231, which is equivalent to the ring extending into the rotary groove by a certain length, and the ring can rotate in the rotary groove.

[0055] In this embodiment, radially inward rotary grooves are formed on the outer peripheral walls of the first flange 202 and the second flange 203, allowing the collar to extend into the grooves and rotate. The rotary grooves simplify the assembly process, making the connection between the first connecting rod 301 and the second connecting rod 401 and the flanges more convenient and faster. The rotary grooves provide adjustment space for the collar's rotation within the grooves. During movement, the rotation of the collar within the rotary grooves reduces lateral collisions and increases the stability of the connection between the connecting seat 2 and the connecting rods.

[0056] In one specific implementation, the first collar 311 is connected to the first rotary groove 221, and the second collar 411 is connected to the second rotary groove 231. This can be achieved by incorporating connection structures within the rotary grooves, such as limiting posts. The collars are fitted onto these limiting posts, providing precise positioning and a stable connection. The limiting posts prevent displacement of the collars within the rotary grooves, ensuring connection stability. Alternatively, additional components can be added to connect the collars to the rotary grooves. These additional components provide extra connection strength, especially under high or dynamic loads, enhancing the reliability and durability of the connection.

[0057] See also Figures 1 to 5 As shown, it also includes a first connecting component 5 and a second connecting component 6. The first connecting component 5 includes a first mounting pin 501 and a first positioning pin 502. Along the axial direction of the crankshaft 7, the first flange 202 is provided with a first pin hole 503. The first mounting pin 501 passes through the first collar 311 and is installed in the first pin hole 503. The first positioning pin 502 connects the first mounting pin 501 and the first flange 202. The second connecting component 6 includes a second mounting pin 601 and a second positioning pin 602. Along the axial direction of the crankshaft 7, the second flange 203 is provided with a second pin hole 603. The second mounting pin 601 passes through the second collar 411 and is installed in the second pin hole 603. The second positioning pin 602 connects the second mounting pin 601 and the second flange 203.

[0058] Specifically, the first collar 311 is installed in the first rotary groove 221, the first mounting pin 501 passes through the first collar 311 and is then installed into the first pin hole 503 provided on the first flange 202, and then the first positioning pin 502 is connected to the first mounting pin 501 and the first flange 202. Similarly, the installation process of the second connecting component 6 is the same as the installation process of the first connecting component 5.

[0059] In this embodiment, the first connecting assembly 5 and the second connecting assembly 6 are mechanically connected via mounting pins and positioning pins to ensure a stable connection between the first collar 311 and the first flange 202, and between the second collar 411 and the second flange 203. The first connecting assembly 5 and the second connecting assembly 6 enable the rotational motion of the crankshaft 7 to be stably transmitted to the first connecting rod 301 and the second connecting rod 401, and subsequently to the first piston 302 and the second piston 402. Furthermore, the positioning pins and mounting pins precisely position the collars relative to the flanges, ensuring the alignment of the connecting rods and pistons.

[0060] See also Figures 1 to 7As shown, with the end face of cylinder seat 1 as the projection plane, cylinder seat 1 has a shaft hole 103. Crankshaft 7 is vertically installed in shaft hole 103. The line connecting the center of crankshaft 7 and the center of shaft hole 103 is the center line, and the length of the center line is R. The center of shaft hole 103 has a first horizontal line, and the angle between the center line and the first horizontal line is α. Connecting seat 2 includes connecting sleeve 201, which is connected to crankshaft 7. The line connecting the center of connecting sleeve 201 to the center of first pin hole 503 is the first line, and the length of the first line is F1. The line connecting the center of connecting sleeve 201 to the center of second pin hole 503 is... The line connecting the centers of holes 603 is the second connecting line, the length of which is F2, and the angle between the first and second connecting lines is θ. A first connecting ring 312 is provided at the second end of the first connecting rod 301. The distance from the center of the first collar 311 to the center of the first connecting ring 312 is L1, and the distance from the center of the second collar 411 to the end face of the second connecting rod 401 is L2. The first end face of the first piston 302 and the first end face of the second piston 402 both face the crankshaft 7, while the second end faces of the first piston 302 and the second end faces of the second piston 402 both face away from the crankshaft 7. The first piston 302 is connected to the first connecting rod 301 via the first connecting pin 303. The vertical distance between the center of the pin hole of the first piston 302 and the second end face of the first piston 302 is a1. The second piston 402 is provided with a snap-fit ​​groove 421. The vertical distance between the inner wall of the snap-fit ​​groove 421 and the second end face of the second piston 402 is a2. The first cylinder 101 and the second cylinder 102 are formed on the wall of the cylinder seat 1. The vertical distance between the center of the shaft hole 103 and the wall of the cylinder seat 1 is H. The vertical distance between the centerline of the first cylinder 101 and the first horizontal line is e1. The vertical distance between the centerline of the second cylinder 102 and the first horizontal line is e1. The vertical distance between the center line and the first horizontal line is e2; the second end face of the first piston 302 and the second end face of the second piston 402 both face away from the crankshaft 7, the vertical distance between the second end face of the first piston 302 and the center of the shaft hole 103 is S1, and S1max is the maximum vertical distance between the second end face of the first piston 302 and the center of the shaft hole 103; the vertical distance between the second end face of the second piston 402 and the center of the shaft hole 103 is S2, and S2max is the maximum vertical distance between the second end face of the second piston 402 and the center of the shaft hole 103; the vertical distance S1 satisfies:

[0061] H+0.5mm≥S1max≥H;

[0062] The vertical distance S2 satisfies:

[0063]

[0064] H+0.5mm≥S2max≥H.

[0065] In this embodiment, the selection of the above parameters is determined by the stroke of the first piston 302 and the second piston 402. Specifically, the stroke of the second end face of the first piston 302 and the second end face of the second piston 402 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 vertical distances S1 and S2 are related to multiple parameters. Some parameters are dynamically changing, such as the angle α between the center line and the first horizontal line, while others need to be limited during the design. Therefore, the vertical distances S1 and S2 are used to determine the vertical distance H between the front end face of the cylinder seat 111 and the shaft hole 103, 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.

[0066] Specifically, increasing the length F1 increases the maximum value of S1 and S2 and decreases the minimum value, thus increasing the stroke of the piston's second end face (S1max-S1min and S2max-S2min). Increasing the length F2 decreases the maximum value of the vertical distance S2 and increases the minimum value, thus decreasing the stroke of the piston's front end face (S1max-S1min and S2max-S2min). A larger included angle θ decreases both the maximum and minimum values ​​of the vertical distance S1, but increases the stroke of the piston's second end face (S1max-S1min).

[0067] It is worth noting that as the angle α between the line connecting the centers of crankshaft 7 and the vertical distance S1 changes, the vertical distance S2 will also have a maximum and a minimum value. The effective stroke of the first piston 302 and the second piston 402 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 302 and the second piston 402 and the center of the shaft hole 103, which can be understood as the motion equations of the two piston front 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.

[0068] Diameters D1 and D2 satisfy: This ensures that the piston can slide back and forth within the cylinder. In this embodiment, limiting the relationship between diameters D1 and D2 and vertical distances e1 and e2 is to prevent the two cylinder bores from being designed too large, exceeding the total length of vertical distances e1 and e2, which would cause the two cylinder bores to overlap.

[0069] A compressor includes a pump body assembly, the pump body assembly being the pump body assembly described above.

[0070] A refrigerator includes a compressor, wherein the compressor is the compressor described above.

[0071] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0072] 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 seat (1), connecting seat (2), crankshaft (7), first compression assembly (3), and second compression assembly (4); The cylinder seat (1) is provided with at least a first cylinder (101) and a second cylinder (102), the first cylinder (101) and the second cylinder (102) are arranged on the same side in the horizontal direction, and the center line of the first cylinder (101) and the center line of the second cylinder (102) are parallel to each other; the first compression assembly (3) includes a first connecting rod (301) and a first piston (302), the first piston (302) is slidably disposed in the first cylinder (101); the second compression assembly (4) includes a second connecting rod (401) and a second piston (402), the second piston (402) is slidably disposed in the second cylinder (102); The crankshaft (7) is disposed in the cylinder seat (1), the connecting seat (2) is connected to the crankshaft (7), the first end of the first connecting rod (301) and the first end of the second connecting rod (401) are respectively rotatably connected to the connecting seat (2), the second end of the first connecting rod (301) is connected to the first piston (302), and the second end of the second connecting rod (401) is connected to the second piston (402); The second end of the first connecting rod (301) is rotatably connected to the first piston (302), and the second end of the second connecting rod (401) is locked to the second piston (402); the second connecting rod (401) includes a locking block (412), the locking block (412) is disposed on the second end of the second connecting rod (401), and the second piston (402) is provided with a locking groove (421), the locking block (412) is embedded in the locking groove (421); The snap-fit ​​groove (421) includes a mounting groove (422) and a connecting groove (423). The mounting groove (422) and the connecting groove (423) are formed on the outer peripheral wall of the second piston (402). The end face of the second piston (402) facing the second connecting rod (401) is the first end face (424). One end of the connecting groove (423) is connected to the mounting groove (422), and the other end of the connecting groove (423) passes through the first end face (424). The snap-fit ​​block (412) is embedded in the mounting groove (422), and a portion of the second connecting rod (401) is embedded in the connecting groove (423).

2. The pump body assembly according to claim 1, characterized in that, The connecting seat (2) includes a connecting sleeve (201), a first flange (202) and a second flange (203). The connecting sleeve (201) is connected to the crankshaft (7). The first flange (202) and the second flange (203) are disposed on the outer peripheral wall of the connecting sleeve (201). The first flange (202) and the second flange (203) are disposed on the same side in the horizontal direction. The first end of the first connecting rod (301) is rotatably connected to the first flange (202), and the first end of the second connecting rod (401) is rotatably connected to the second flange (203).

3. The pump body assembly according to claim 2, characterized in that, The first connecting rod (301) has a first collar (311) at its first end, and the outer peripheral wall of the first flange (202) has a first radially inward rotating groove (221) in which the first collar (311) is installed; the second connecting rod (401) has a second collar (411) at its first end, and the outer peripheral wall of the second flange (203) has a second radially inward rotating groove (231) in which the second collar (411) is installed.

4. The pump body assembly according to claim 3, characterized in that, It also includes a first connecting component (5) and a second connecting component (6). The first connecting component (5) includes a first mounting pin (501) and a first positioning pin (502). Along the axial direction of the crankshaft (7), the first flange (202) is provided with a first pin hole (503). The first mounting pin (501) passes through the first collar (311) and is installed in the first pin hole (503). The first positioning pin (502) connects the first mounting pin (501) and the first flange (202). The second connecting assembly (6) includes a second mounting pin (601) and a second positioning pin (602). Along the axial direction of the crankshaft (7), the second flange (203) is provided with a second pin hole (603). The second mounting pin (601) passes through the second collar (411) and is installed in the second pin hole (603). The second positioning pin (602) connects the second mounting pin (601) and the second flange (203).

5. The pump body assembly according to claim 4, characterized in that, With the end face of the cylinder seat (1) as the projection plane, the cylinder seat (1) has a shaft hole (103), the crankshaft (7) is vertically installed in the shaft hole (103), the line connecting the crank center of the crankshaft (7) and the center of the shaft hole (103) is the center line, and the length of the center line is R; the center of the shaft hole (103) has a first horizontal line, and the angle between the center line and the first horizontal line is α; the connecting seat (2) includes a connecting sleeve (201), the connecting sleeve (201) is connected to the crankshaft (7), and the line connecting the center of the connecting sleeve (201) to the center of the first pin hole (503) is the first line, the The length of the first connecting line is F1, the line connecting the center of the connecting sleeve (201) to the center of the second pin hole (603) is the second connecting line, the length of the second connecting line is F2, and the included angle between the first connecting line and the second connecting line is θ; the second end of the first connecting rod (301) is provided with a first connecting ring (312), the distance from the center of the first collar (311) to the center of the first connecting ring (312) is L1, and the distance from the center of the second collar (411) to the second end face of the second connecting rod (401) is L2; ​​the first end face of the first piston (302) and the first end face of the second piston (402) both face the crankshaft (7). The second end face of the first piston (302) and the second end face of the second piston (402) are both away from the crankshaft (7). The first piston (302) is connected to the first connecting rod (301) through the first connecting pin (313). The vertical distance between the center of the pin hole of the first piston (302) and the second end face of the first piston (302) is a1. The second piston (402) is provided with a snap-fit ​​groove (421). The vertical distance between the inner wall of the snap-fit ​​groove (421) and the second end face of the second piston (402) is a2. The first cylinder (101) and the second cylinder (102) are formed on the wall of the cylinder seat (1). The vertical distance between the center of the shaft hole (103) and the wall of the cylinder seat (1) is H; the vertical distance between the centerline of the first cylinder (101) and the first horizontal line is e1, and the vertical distance between the centerline of the second cylinder (102) and the first horizontal line is e2; the second end face of the first piston (302) and the second end face of the second piston (402) are both away from the crankshaft (7), the vertical distance between the second end face of the first piston (302) and the center of the shaft hole (103) is S1, and S1max is the maximum vertical distance between the second end face of the first piston (302) and the center of the shaft hole (103);The vertical distance between the second end face of the second piston (402) and the center of the shaft hole (103) is S2, and S2max is the maximum vertical distance between the second end face of the second piston (402) and the center of the shaft hole (103); the vertical distance S1 satisfies: ,H+0.5mm≥S1max≥H; 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 (302) is D1, and the diameter of the second piston (402) 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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