A pump assembly, a compressor, and a refrigerator

Abstract

This invention provides a pump body assembly, a compressor, and a refrigerator. The pump body assembly includes a cylinder seat, a splitter, a crankshaft, and a first piston and a second piston. The cylinder seat has at least one first cylinder and one second cylinder, which are horizontally aligned on the same side and their centerlines are parallel. The crankshaft is housed in the cylinder seat. The splitter includes a first support rod and a second support rod. The connecting end of the first support rod is connected to the first piston, which is slidably disposed in the first cylinder. The connecting end of the second support rod is connected to the second piston, which is slidably disposed in the second cylinder. The splitter of this invention, including the first and second support rods, allows for the arrangement of two compression assemblies within a limited space while ensuring a certain degree of flexibility for both the first and second support rods. The splitter transmits the rotational motion of the crankshaft to the first and second support rods, simplifying assembly.

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, including a cylinder seat, a splitter, a crankshaft, and a first piston and a second piston;

[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.

[0006] The crankshaft is disposed in the cylinder block, and the splitter is connected to the crankshaft. The splitter includes a first support rod and a second support rod. The connecting end of the first support rod is connected to the first piston, which is slidably disposed in the first cylinder. The connecting end of the second support rod is connected to the second piston, which is slidably disposed in the second cylinder.

[0007] In some embodiments, the connecting end of the first support rod is rotatably connected to the first piston, and the connecting end of the second support rod is rotatably connected to the second piston, wherein the second piston is a block structure with interconnected blocks.

[0008] In some embodiments, the second piston includes a connecting block and a compression block. Along the axial direction of the second cylinder, the compression block is disposed outside the connecting block. The connecting end of the second support rod is rotatably connected to the first end of the connecting block, the second end of the connecting block is connected to the compression block, and the connecting block is translatably disposed in the radial direction of the compression block.

[0009] In some embodiments, a translation wedge is provided at the second end of the connecting block, and a groove is provided on the end face of the compression block facing the connecting block, wherein the translation wedge is slidably disposed in the groove.

[0010] In some embodiments, the diameter of the compression block is greater than the maximum diameter of the second end of the connecting block, and the radial width of the groove is greater than the radial width of the translation wedge.

[0011] In some embodiments, the splitter further includes a connecting sleeve connected to the crankshaft, wherein the fixed ends of the first support rod and the second support rod are both connected to the outer peripheral wall of the connecting sleeve.

[0012] In some embodiments, the end face of the splitter is used as the projection plane, and the first support rod and the second support rod are arranged at an angle.

[0013] 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 outer diameter of the first piston is D1, the outer diameter of the second piston is D2, and the line connecting the center of the crankshaft and the center of the shaft hole is a center line with a length 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. A first through hole is provided in the radial direction of the first piston. The first piston is connected to the first support rod by a first connecting pin, which is installed in the first through hole. The vertical distance between the center of the first through hole and the end face of the first piston away from the first support rod is a1. A connecting block is provided in the radial direction. The second through hole connects the connecting block to the second support rod via a second connecting pin, which is installed in the second through hole. The vertical distance between the center of the second through hole and the end face of the compression block facing away from the connecting block is a2. 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. The first support rod and the second support rod have an included angle θ. 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:

[0014] H+0.5mm≥S1max≥H;

[0015] 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:

[0016] H+0.5mm≥S2max≥H.

[0017] In some embodiments, the diameter of the first piston is D1, and the diameter of the second piston is D2;

[0018] The diameters D1 and D2 satisfy:

[0019] In some embodiments, the vertical distance between the geometric center of the compression block and the geometric center of the connecting block is F, and the vertical distance F satisfies:

[0020]

[0021] A compressor includes a pump body assembly, the pump body assembly being the pump body assembly described above.

[0022] A refrigerator includes a compressor, said compressor being the refrigerator described above.

[0023] The pump assembly, compressor, and refrigerator provided by this invention have the following beneficial effects:

[0024] The present invention includes a splitter component comprising a first support rod and a second support rod, which allows for the arrangement of two compression components within a limited space while ensuring a certain degree of flexibility for both the first and second support rods. The splitter component transmits the rotational motion of the crankshaft to the first and second support rods, thereby driving the pistons to reciprocate within the cylinders. This ensures that the rotation of the crankshaft synchronously drives the two pistons, achieving coordinated operation. Since the first and second cylinders are positioned on the same side in the horizontal direction with parallel centerlines, this layout helps maintain the balance of the compressor, improving operational stability and efficiency. The present invention simplifies the assembly process by incorporating the splitter component. If the first and second support rods were directly connected to the crankshaft, multiple eccentric portions would be required on the crankshaft, increasing manufacturing difficulty and assembly complexity. By using the splitter component, 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, and it is quite difficult to assemble pistons and support rods on the cylinders. This invention can effectively avoid these problems by setting a directional component, making the design and manufacturing of the compressor more flexible and convenient. Attached Figure Description

[0025] 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.

[0026] Figure 1 This is a schematic diagram of the pump body assembly according to an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of a directional component according to an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the second piston according to an embodiment of the present invention;

[0029] Figure 4 This is a cross-sectional view of the second piston according to an embodiment of the present invention;

[0030] Figure 5This is a schematic diagram of the diameter D2 in an embodiment of the present invention;

[0031] Figure 6 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-Split component; 201-First support rod; 202-Second support rod; 203-Connecting sleeve; 3-Crankshaft; 4-First piston; 5-Second piston; 501-Connecting block; 511-Transfer wedge block; 502-Compression block; 521-Slide groove; 61-First connecting pin; 62-First connecting pin. 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 3 As shown, according to an embodiment of the present invention, a pump body assembly is provided, which includes a cylinder seat 1, a splitter 2, a crankshaft 3, a first piston 4, and a second piston 5; the cylinder seat 1 has 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 crankshaft 3 is disposed in the cylinder seat 1, the splitter 2 is connected to the crankshaft 3, the splitter 2 includes a first support rod 201 and a second support rod 202, the connecting end of the first support rod 201 is connected to the first piston 4, the first piston 4 is slidably disposed in the first cylinder 101; the connecting end of the second support rod 202 is connected to the second piston 5, the second piston 5 is slidably disposed in the second cylinder 102.

[0038] Specifically, crankshaft 3 is installed in cylinder seat 1, and bearing assembly is sleeved on crankshaft 3. Split member 2 is connected to crankshaft 3. During the rotation of crankshaft 3, split member 2 is driven to rotate synchronously. The connecting end of first support rod 201 is connected to first piston 4. First piston 4 is slidably disposed in first cylinder 101. The connecting end of second support rod 202 is connected to second piston 5. Second piston 5 is slidably disposed in second cylinder 102. During the rotation of split member 2, first support rod 201 and second support rod 202 are driven simultaneously, thereby converting the rotational motion of crankshaft 3 into the reciprocating motion of piston. The center line of first piston 4 and center line of second piston 5 are parallel.

[0039] In this embodiment, the splitter 2 includes a first support rod 201 and a second support rod 202, which allows for the arrangement of two compression components within a limited space while ensuring that the first support rod 201 and the second support rod 202 have a certain degree of flexibility. The splitter 2 transmits the rotational motion of the crankshaft 3 to the first support rod 201 and the second support rod 202, 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 splitter 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. This embodiment simplifies the assembly process by setting the splitter 2. If the first support rod 201 and the second support rod 202 are directly connected to the crankshaft 3, multiple eccentric parts will need to be set on the crankshaft 3, which will increase the manufacturing difficulty and assembly complexity of the crankshaft 3. By using the splitter 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 support rods on the cylinders is quite difficult. This embodiment can effectively avoid these problems by setting the splitting component 2, making the design and manufacturing of the compressor more flexible and convenient.

[0040] See also Figures 1 to 3 As shown, the connecting end of the first support rod 201 is rotatably connected to the first piston 4, and the connecting end of the second support rod 202 is rotatably connected to the second piston 5. The second piston 5 is a block structure with interconnected blocks.

[0041] In this embodiment, the connecting ends of the first support rod 201 and the second support rod 202 are rotatably connected to the piston. This connection method can enhance the stability and reliability of the structure and reduce problems caused by improper assembly. Furthermore, the second piston 5 is set as a modular structure, which allows for certain adjustments to the structure without affecting the operation of the second piston 5.

[0042] See also Figures 1 to 5 As shown, the second piston 5 includes a connecting block 501 and a compression block 502. Along the axial direction of the second cylinder 102, the compression block 502 is disposed on the outside of the connecting block 501. The connecting end of the second support rod 202 is rotatably connected to the first end of the connecting block 501. The second end of the connecting block 501 is connected to the compression block 502. The connecting block 501 is translatably disposed in the radial direction of the compression block 502.

[0043] Specifically, the second end of the second support rod 202 is connected to the second piston 5, which is slidably disposed in the second cylinder 102. The second support rod 202 drives the connecting block 501 to move, thereby driving the compression block 502 to compress air. Since the connection between the first support rod 201 and the second support rod 202 is fixed, the second piston 5 will generate an additional radial displacement in the second cylinder 102 in addition to the reciprocating linear motion. This will prevent the center line of the second piston from coinciding with the center line of the second cylinder 102. In this embodiment, the second piston 5 has a segmented structure, and the connecting block 501 can translate in the radial direction, thereby offsetting the additional radial displacement.

[0044] In this embodiment, the sliding of the translation wedge 511 allows the connecting block 501 to move within a certain range, which can reduce the additional constraints caused by the fixed connection, thereby reducing the restriction on the motion accuracy and degree of freedom of the entire structure. This allows the mechanical structure to adapt more flexibly to different working conditions and environments. In addition, during assembly or operation, there may be manufacturing errors or installation deviations. The translation of the connecting block 501 can absorb these errors, compensate for the deviations between components, and ensure the normal sliding of the second piston 5.

[0045] See also Figures 1 to 5 As shown, the second end of the connecting block 501 is provided with a translation wedge 511, and the end face of the compression block 502 facing the connecting block 501 is provided with a groove 521, and the translation wedge 511 is slidably disposed in the groove 521.

[0046] Specifically, before installing the second piston 5, the translation wedge 511 is first installed in the slide groove 521, and then the second piston 5 is installed as a whole into the first cylinder 101. When the crankshaft 3 drives the split component 2, the second support rod 202 drives the second piston 5 to move, the compression block 502 and the connecting block 501 will slide, and the translation wedge 511 can slide in the slide groove 521.

[0047] In this embodiment, the wedge can move smoothly in the slide groove 521. The arrangement of the wedge and the slide groove 521 can reduce the friction and wear of the piston when it moves in the cylinder. By sliding the wedge 511 in the slide groove 521, precise control of the movement of the second piston 5 can be achieved.

[0048] See also Figures 1 to 5 As shown, the diameter of the compression block 502 is greater than the maximum diameter of the second end of the connecting block 501, and the radial width of the slide groove 521 is greater than the radial width of the translation wedge block 511.

[0049] In this embodiment, by setting the diameter of the compression block 502 to be larger than the diameter of the second end of the connecting block 501, and the radial width of the slide groove 521 to be larger than the radial width of the translation wedge 511, the contact area between the wedge and the slide groove 521 can be reduced, thereby reducing friction and wear. Moreover, the larger compression block 502 and slide groove 521 design can provide more space for the wedge to slide, increasing the flexibility of the system and allowing the wedge to move more smoothly in the slide groove 521. The larger diameter and width provide more space for assembly and adjustment, making the fit between the wedge and the slide groove 521 easier and facilitating installation.

[0050] See also Figures 1 to 5 As shown, the splitter 2 also includes a connecting sleeve 203, which is connected to the crankshaft 3. The fixed ends of the first support rod 201 and the second support rod 202 are both connected to the outer peripheral wall of the connecting sleeve 203.

[0051] Specifically, crankshaft 3 is connected to the fixed ends of first support rod 201 and second support rod 202 via connecting sleeve 203. When crankshaft 3 rotates, force is transmitted to the fixed ends of first support rod 201 and second support rod 202 through connecting sleeve 203. First support rod 201 and second support rod 202 are connected to the outer peripheral wall of connecting sleeve 203 through their fixed ends, allowing the connecting rod to move with the rotation of connecting sleeve 203. The other end of first support rod 201 is connected to first piston 4, and the other end of second support rod 202 is connected to second piston 5. When first support rod 201 and second support rod 202 move, they drive first piston 4 and second piston 5 to reciprocate within their respective cylinders. The movement of first piston 4 and second piston 5 within the cylinders is responsible for compressing and drawing in refrigerant. During compression, the pistons move to reduce the space within the cylinders, thereby increasing the pressure and temperature of the refrigerant vapor. During the intake process, the retraction of the piston provides space for refrigerant vapor to enter the cylinder. The continuous rotation of the crankshaft 3 causes the first support rod 201 and the second support rod 202 to reciprocate continuously, which in turn causes the first piston 4 and the second piston 5 to continuously perform compression and intake operations in the cylinder, forming a continuous working cycle.

[0052] In this embodiment, the connecting sleeve 203 is connected to the crankshaft 3, and the first support rod 201 and the second support rod 202 are connected to the first piston 4 and the second piston 5 respectively. The rotational motion of the crankshaft 3 can be effectively transmitted to the piston to realize the reciprocating motion of the piston. Using the connecting sleeve 203 can simplify the structure of the pump body assembly, reduce the complex mechanical structure required to directly connect the crankshaft 3 and the piston, and facilitate assembly.

[0053] See also Figures 1 to 5 As shown, with the end face of the split member 2 as the projection plane, the first support rod 201 and the second support rod 202 are set at an angle to each other.

[0054] In this embodiment, the included angle setting allows the force transmission of the first support rod 201 and the second support rod 202 to be more direct and effective when driving the piston, avoiding motion interference between the first support rod 201 and the second support rod 202. By adjusting the included angle between the first support rod 201 and the second support rod 202, the possibility of interference during movement can be reduced, thereby avoiding collisions and wear between components.

[0055] See also Figure 6 As shown, with the end face of cylinder seat 1 as the projection plane, cylinder seat 1 has a shaft hole 103. Crankshaft 3 is vertically installed in shaft hole 103. The outer diameter of the first piston 4 is D1, and the outer diameter of the second piston 5 is D2. The line connecting the center of the crankshaft 3 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. A first through hole is provided in the radial direction of the first piston 4. The first piston 4 is connected to the first support rod 201 through a first connecting pin 61. The first connecting pin 61 is installed in the first through hole. The vertical distance between the center of the first through hole and the end face of the first piston 4 away from the first support rod 201 is a1. A second through hole is provided in the radial direction of the connecting block 501. Block 501 is connected to the second support rod 202 via the second connecting pin 62. The second connecting pin 62 is installed in the second through hole. The vertical distance between the center of the second through hole and the end face of the compression block 502 away from the connecting block 501 is a2. The vertical distance between the center of the shaft hole 103 and the first end face 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 e2. The first support rod 201 and the second support rod 202 have an included angle θ. The vertical distance between the second end face of the first piston 4 and the center of the shaft hole 103 is S1. S1max is the maximum vertical distance between the second end face of the first piston 4 and the center of the shaft hole 103. The vertical distance S1 satisfies:

[0056] H+0.5mm≥S1max≥H;

[0057] The vertical distance between the second end face of the second piston 5 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 5 and the center of the shaft hole 103. The vertical distance S2 satisfies:

[0058] H+0.5mm≥S2max≥H.

[0059] In this embodiment, the selection of the above parameters is determined by the stroke of the first piston 4 and the second piston 5. That is, the stroke of the second end face of the first piston 4 and the second end face of the second piston 5 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.

[0060] It is worth noting that as the angle α between the line connecting the centers of crankshaft 3 and the line of sight to crankshaft 5 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 4 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 4 and the second piston 5 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.

[0061] See also Figure 6 As shown, the diameter of the first piston 4 is D1, and the diameter of the second piston 5 is D2;

[0062] Diameters D1 and D2 satisfy:

[0063] 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 11 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.

[0064] See also Figure 6 As shown, the vertical distance between the geometric center of the compression block 502 and the geometric center of the connecting block 501 is F, and the vertical distance F satisfies:

[0065]

[0066] In this embodiment, since the splitter 2 has a fixed center line angle θ, the second piston 5 will have a lateral displacement on the horizontal plane perpendicular to the reciprocating direction. The amount of translation that can be adjusted and offset is determined by adjusting the distance F between the compression block 502 and the connecting block 501. This distance F is also the maximum distance that the translation wedge 511 can move to the leftmost or rightmost position.

[0067] As a specific implementation, to avoid the translation end 162 colliding with the cylinder inner wall due to excessive lateral displacement, the two side edges of the connecting block 501 should not exceed the outer circular edge of the compression block 502. The diameter of the second piston 5 is D2, that is, the diameter of the first end face of the second piston 5 is D2. The end face of the connecting block 501 with the translation wedge 511 includes an arc segment and a straight segment. The top and bottom surfaces of the connecting block 501 are both arc segments, and the two ends of the arc segments are connected by straight segments. The vertical distance between the two arc segments is h4, and the vertical distance from the connection point of the arc segment and the straight segment to the horizontal center line of the connecting block 501 is h3. Therefore, the center line distance F between the compression block 502 and the translation block should meet the following constraints:

[0068]

[0069] In this embodiment, since the translation wedge 511 needs to move in the groove, the second piston is provided with an arc segment to prevent the translation wedge 511 from sliding out of the groove. That is, the maximum size of the end face of the connecting block 501 is always smaller than the end face size of the compression block 502.

[0070] A compressor includes a pump body assembly, the pump body assembly being the aforementioned pump body assembly.

[0071] A refrigerator includes a compressor, wherein the compressor is the refrigerator described above.

[0072] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0073] 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 by, The utility model relates to a kind of cylinder-piston units, including: Cylinder block (1), split piece (2), crankshaft (3) and first piston (4) and second piston (5); The cylinder block (1) is at least provided with first cylinder (101) and second cylinder (102), the first cylinder (101) and the second cylinder (102) are horizontally arranged to the same side, and the center lines of the first cylinder (101) and the second cylinder (102) are parallel to each other; The crankshaft (3) is arranged in the cylinder block (1), the split piece (2) is connected with the crankshaft (3), the split piece (2) includes first branch rod (201) and second branch rod (202), the connecting end of the first branch rod (201) is connected with the first piston (4), and the first piston (4) is slidably arranged in the first cylinder (101);The connecting end of the second branch rod (202) is connected with the second piston (5), and the second piston (5) is slidably arranged in the second cylinder (102); The connecting end of the first branch rod (201) is rotatably connected with the first piston (4), the connecting end of the second branch rod (202) is rotatably connected with the second piston (5), and the second piston (5) is a block structure connected by blocks; The second piston (5) includes connecting block (501) and compression block (502), along the axial direction of the second cylinder (102), the compression block (502) is arranged outside the connecting block (501), the connecting end of the second branch rod (202) is rotatably connected with the first end of the connecting block (501), the second end of the connecting block (501) is connected with the compression block (502), and the connecting block (501) is translatably arranged in the radial direction of the compression block (502);The second end of the connecting block (501) is provided with a translation wedge (511), and the end face of the compression block (502) towards the connecting block (501) is provided with a sliding groove (521), and the translation wedge (511) is slidably arranged in the sliding groove (521).

2. The pump body assembly of claim 1, wherein, The diameter of the compression block (502) is greater than the maximum diameter of the second end of the connecting block (501), and the radial width of the sliding groove (521) is greater than the radial width of the translation wedge (511).

3. The pump body assembly of claim 1, wherein, The split piece (2) further includes a connecting sleeve (203) connected to the crankshaft (3), and the fixed ends of the first branch rod (201) and the second branch rod (202) are connected to the outer peripheral wall of the connecting sleeve (203).

4. The pump body assembly of claim 3, wherein, With the end face of the split piece (2) as a projection plane, the first branch rod (201) and the second branch rod (202) are arranged at an included angle.

5. The pump body assembly of claim 2, wherein, The end face of the cylinder base (1) is taken as a projection plane, the cylinder base (1) is provided with a shaft hole (103), the crankshaft (3) is vertically installed in the shaft hole (103), the outer diameter of the first piston (4) is D1, the outer diameter of the second piston (5) is D2, the center line between the crank center of the crankshaft (3) and the center of the shaft hole (103) is a center line, and the length of the center line is R; the first branch rod (201) is connected with the first piston (4) through a pin shaft, the first branch rod (201) is provided with a first connecting pin hole, the vertical distance between the crank center of the crankshaft (3) and the first connecting pin hole is L1, the second branch rod (202) is connected with the second piston (5) through a pin shaft, the second branch rod (202) is provided with a second connecting pin hole, the vertical distance between the crank center of the crankshaft (3) and the second connecting pin hole is L2, the center of the shaft hole (103) has a first horizontal line, and the included angle between the center line and the first horizontal line is α; the first piston (4) is provided with a first through hole in the radial direction, the first piston (4) is connected with the first branch rod (201) through a first connecting pin (61), the first connecting pin (61) is installed in the first through hole, the vertical distance between the center of the first through hole and the end face of the first piston (4) away from the first branch rod (201) is a1; the connecting block (501) is provided with a second through hole in the radial direction, the connecting block (501) is connected with the second branch rod (202) through a second connecting pin (62), the second connecting pin (62) is installed in the second through hole, the vertical distance between the center of the second through hole and the end face of the compression block (502) away from the connecting block (501) is a2, and the vertical distance between the center of the shaft hole (103) and the first end face of the cylinder base (1) is H; the vertical distance between the center line of the first cylinder (101) and the first horizontal line is e1, the vertical distance between the center line of the second cylinder (102) and the first horizontal line is e2; the first branch rod (201) and the second branch rod (202) have an included angle θ, the vertical distance between the second end face of the first piston (4) and the center of the shaft hole (103) is S1, S1max is the maximum vertical distance between the second end face of the first piston (4) and the center of the shaft hole (103), and the vertical distance S1 satisfies: ； The vertical distance between the second end face of the second piston (5) and the center of the shaft hole (103) is S2, S2max is the maximum vertical distance between the second end face of the second piston (5) and the center of the shaft hole (103), and the vertical distance S2 satisfies: H + 0.5 mm ≥ S2max ≥ H.

6. The pump body assembly of claim 5, wherein, The diameter of the first piston (4) is D1, and the diameter of the second piston (5) is D2; The diameter D1 and the diameter D2 satisfy: .

7. The pump body assembly of claim 6, wherein, The vertical distance between the geometric center of the compression block (502) and the geometric center of the connecting block (501) is F, and the vertical distance F satisfies: 。 8. The pump body assembly of claim 7, wherein, The diameter of the second piston (5) is D2, the end face of the translation wedge (511) provided in the connecting block (501) comprises an arc segment and a straight segment, the top surface and the bottom surface of the connecting block (501) are both arc segments, the two ends of the arc segment are connected through the straight segment respectively, the vertical distance between the two arc segments is h4, the vertical distance from the connecting position of the arc segment and the straight segment to the horizontal center line of the connecting block (501) is h3, and the vertical distance F between the compression block (502) and the vertical distance F satisfies the following constraint condition: 。 9. A compressor comprising a pump body assembly according to any one of claims 1 to 8.

10. A refrigerator comprising a compressor according to claim 9.

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