Piston compressor and pump body structure thereof

Abstract

This invention provides a piston compressor and its pump body structure. The pump body structure includes a cylinder, a piston, and a connecting rod. The cylinder bore has opposing first and second cylinder walls, and the piston is movably disposed within the cylinder bore. The connecting rod is connected to the piston and is driven to reciprocate the piston along the first and second cylinder walls between top dead center (TDC) and bottom dead center (BDC). When the piston is between TDC and BDC, the connecting rod applies a force to the piston towards the first cylinder wall. The pump body structure of the piston compressor also includes an elastic element, which applies a force to the piston towards the second cylinder wall when the piston is between TDC and BDC. According to the technical solution of this invention, the force applied to the piston by the elastic element can counteract the lateral force applied to the piston by the connecting rod, thereby balancing the lateral force during the piston's reciprocating motion, reducing the frictional resistance between the piston and the cylinder wall, and reducing both frictional power consumption and noise.

Description

Technical Field

[0001] This invention belongs to the field of piston compressor technology, specifically relating to a piston compressor and its pump body structure. Background Technology

[0002] The piston compressor is the core component of a refrigerator's refrigeration system, and its performance and reliability directly determine the cooling effect. The piston compressor's pump body mainly consists of a cylinder, crankshaft, connecting rod, piston, and cylinder head assembly. During operation, the crankshaft rotates under the drive of a motor, and the crankshaft, through the connecting rod, drives the piston to reciprocate within the cylinder, changing the cylinder's volume to draw in low-pressure refrigerant and compress it. Piston compressors have advantages such as a wide pressure range and a wide discharge capacity range, and are widely used in various industrial applications.

[0003] Among them, such as Figure 1 and Figure 2 As shown, during the reciprocating motion of the piston inside the cylinder, the connecting rod force acting on the piston can be decomposed along the connecting rod direction into a force along the cylinder axis and a lateral force perpendicular to the cylinder wall. The former acts on the piston, causing it to reciprocate along the cylinder axis; the latter (lateral force) acts on the cylinder wall, increasing the friction between the piston and the cylinder wall, generating frictional power consumption. When the compressor speed is too high, the piston reciprocates very quickly, resulting in high frictional power consumption, significant noise, and even slight deformation of the cylinder under high load. Summary of the Invention

[0004] Therefore, the present invention provides a piston compressor and its pump body structure, which can solve the problem that the lateral force in the reciprocating motion of the piston in the prior art is difficult to balance, resulting in high frictional power consumption and large noise and vibration.

[0005] To solve the above problems, the present invention provides a pump body structure for a piston compressor, which includes a cylinder, a piston, and a connecting rod. The cylinder bore has opposing first and second cylinder walls, and the piston is movably disposed within the cylinder bore. The connecting rod is connected to the piston and is driven to cause the piston to reciprocate between the top dead center and the bottom dead center along the first and second cylinder walls.

[0006] The piston compressor pump body structure further includes an elastic element, which is used to apply a force to the piston towards the second cylinder wall when the piston is located between the top dead center and the bottom dead center.

[0007] In some embodiments, when the piston is between top dead center and bottom dead center, the force exerted by the connecting rod on the piston toward the first cylinder wall is equal to the force exerted by the elastic element on the piston toward the second cylinder wall.

[0008] In some embodiments, one end of the elastic element is connected to the second cylinder wall, and the other end of the elastic element is connected to the piston.

[0009] In some embodiments, the pump body structure of the piston compressor further includes a piston pin disposed on the piston, and the connecting rod is connected to the piston via the piston pin;

[0010] The other end of the elastic element is connected to the piston via the piston pin.

[0011] In some embodiments, the piston is provided with a clearance hole for the elastic element to pass through, wherein when the piston is located between the top dead center and the bottom dead center, the elastic element does not contact the sidewall of the clearance hole.

[0012] In some embodiments, the clearance hole is a through hole extending axially from one end of the piston to the middle of the piston.

[0013] In some embodiments, the number of elastic elements is two or more, and the number of clearance holes is equal to the number of elastic elements and corresponds one-to-one;

[0014] The elastic elements are arranged sequentially at intervals along the axial direction of the piston pin.

[0015] In some embodiments, the piston is provided with a pin hole for mounting a piston pin; wherein the pin hole is a blind hole and the pin hole provides support to the piston pin through its bottom surface.

[0016] In some embodiments, the piston is provided with an oil leakage hole that communicates with the bottom of the pin hole.

[0017] The present invention also provides a piston compressor, which includes the pump body structure described in any one of the above-described embodiments.

[0018] The piston compressor and its pump body structure provided by this invention have the following beneficial effects:

[0019] 1. The force exerted by the connecting rod on the piston, moving towards the first cylinder wall, is opposite in direction to the force exerted by the elastic element on the piston, moving towards the second cylinder wall. In this way, the force exerted by the elastic element on the piston can counteract the lateral force exerted by the connecting rod on the piston, thereby balancing the lateral force in the reciprocating motion of the piston, reducing the frictional resistance between the piston and the cylinder wall, and reducing frictional power consumption and noise.

[0020] 2. A clearance hole is provided on the piston for the elastic element to pass through. When the piston is between the top dead center and the bottom dead center, the elastic element does not come into contact with the side wall of the clearance hole. This can prevent the spring from interfering with the piston during its movement, so as not to affect the normal movement of the piston. Attached Figure Description

[0021] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0022] Figure 1 This is a force analysis diagram of the piston of a piston compressor in the prior art when the piston moves from the top dead center to the bottom dead center;

[0023] Figure 2 This is a force analysis diagram of the piston of a piston compressor in the prior art when the piston moves from the bottom dead center to the top dead center;

[0024] Figure 3 This is a schematic diagram of the pump body structure of the piston compressor of the present invention;

[0025] Figure 4 This is a cross-sectional view of the pump body structure of the piston compressor of the present invention;

[0026] Figure 5 This is an exploded view of the pump body structure of the piston compressor of the present invention;

[0027] Figure 6 This is a schematic diagram of the piston pin structure;

[0028] Figure 7 This is a structural schematic diagram of the elastic element;

[0029] Figure 8 This is a schematic diagram of the piston structure;

[0030] Figure 9 This is a structural schematic diagram of the piston from another perspective.

[0031] The attached figures are labeled as follows:

[0032] 1. Cylinder; 2. Crankshaft; 3. Connecting rod; 4. Piston pin; 5. Elastic element; 6. Piston; 41. Mounting hole; 61. Pin hole; 62. Clearance hole; 63. Oil leakage hole; 10. Cylinder bore; 101. First cylinder wall; 102. Second cylinder wall. 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] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0035] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0036] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the structures, proportions, sizes, etc., shown in the accompanying drawings are only for the purpose of illustrative purposes and to facilitate understanding and reading by those skilled in the art, and are not intended to limit the conditions under which the invention can be implemented. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effects and objectives achieved by the invention, should still fall within the scope of the technical content disclosed in the invention. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] See also Figure 3-9 As shown, according to an embodiment of the present invention, a pump body structure for a piston compressor is provided, comprising a cylinder 1, a piston 6, and a connecting rod 3. The cylinder bore 10 of the cylinder 1 has opposing first cylinder walls 101 and second cylinder walls 102. The piston 6 is movably disposed within the cylinder bore 10, with one side of the piston 6 slidingly engaged with the first cylinder wall 101 and the other side of the piston 6 slidingly engaged with the second cylinder wall 102. The piston 6 can reciprocate within the cylinder bore 10 along the first cylinder wall 101 and the second cylinder wall 102. The aforementioned connecting rod 3 is connected to the piston 6, and the connecting rod 3 is driven to cause the piston 6 to reciprocate between the top dead center and the bottom dead center along the first cylinder wall 101 and the second cylinder wall 102. When the piston 6 is located between the top dead center and the bottom dead center, the connecting rod 3 applies a force to the piston 6 towards the first cylinder wall 101.

[0041] The pump body structure of the aforementioned piston compressor also includes an elastic element 5, which is used to apply a force to the piston 6 towards the second cylinder wall 102 side when the piston 6 is located between the top dead center and the bottom dead center.

[0042] It should be noted that the elastic element 5 mentioned above can be a spring or flexible plastic, etc., and the specific choice can be made according to the actual situation.

[0043] In the above example, the first cylinder wall 101 and the second cylinder wall 102 are opposing cylinder walls, such that the force exerted by the connecting rod 3 on the piston 6 moving towards the first cylinder wall 101 is opposite in direction to the force exerted by the elastic member 5 on the piston 6 moving towards the second cylinder wall 102. In this way, the force exerted by the elastic member 5 on the piston 6 can counteract the lateral force exerted by the connecting rod 3 on the piston 6, thereby balancing the lateral force in the reciprocating motion of the piston 6, reducing the frictional resistance between the piston 6 and the side wall of the cylinder 1, and reducing both frictional power consumption and noise.

[0044] Preferably, when the piston 6 is between the top dead center and the bottom dead center, the force exerted by the connecting rod 3 on the piston 6 to move toward the first cylinder wall 101 is equal to the force exerted by the elastic member 5 on the piston 6 to move toward the second cylinder wall 102. This can make the lateral force on the piston 6 completely balanced, thereby minimizing the frictional resistance between the piston 6 and the side wall of the cylinder 1, reducing frictional power consumption and noise.

[0045] In some implementations, such as Figure 4 As shown, one end of the aforementioned elastic member 5 is connected to the second cylinder wall 102, and the other end of the elastic member 5 is connected to the piston 6. Thus, when the piston 6 moves between the top dead center and the bottom dead center, the elastic member 5 undergoes tensile deformation, allowing the elastic member 5 to apply a force to the piston 6 that moves toward the second cylinder wall 102.

[0046] like Figure 5 As shown, the pump body structure of the aforementioned piston compressor may further include a piston pin 4 disposed on the piston 6, and the connecting rod 3 is connected to the piston 6 through the piston pin 4. The other end of the elastic element 5 is connected to the piston 6 through the piston pin 4.

[0047] In the example above, since the lateral force applied by the connecting rod 3 to the piston 6 is mainly transmitted through the piston pin 4, by connecting the elastic element 5 to the piston pin 4, it is beneficial to balance the lateral force on the piston pin 4, thereby reducing the wear of the piston pin 4.

[0048] like Figure 9As shown, the aforementioned piston 6 is provided with a clearance hole 62 for the elastic element 5 to pass through. When the piston 6 is between the top dead center and the bottom dead center, the elastic element 5 does not come into contact with the side wall of the clearance hole 62, thus preventing the spring from interfering with the piston 6 during its movement and ensuring that the normal movement of the piston 6 is not affected.

[0049] In some implementations, such as Figure 9 As shown, the aforementioned clearance hole 62 is a through hole that extends from one end of the piston 6 along the axial direction of the piston to the middle of the piston 6. This is mainly to facilitate the machining of the clearance hole 62.

[0050] In some implementations, such as Figure 5 As shown, the number of the aforementioned elastic elements 5 can be two or more, and the number of the aforementioned clearance holes 62 is equal to the number of elastic elements 5 and corresponds one-to-one. The elastic elements 5 are arranged sequentially at intervals along the axial direction of the piston pin 4. When the piston 6 is located between the top dead center and the bottom dead center, each elastic element 5 cooperates to apply a force to the piston 6 to move towards the second cylinder wall 102 side.

[0051] In some implementations, such as Figure 8 and Figure 9 As shown, the aforementioned piston 6 is provided with a pin hole 61 for mounting the piston pin 4. The pin hole 61 can be a blind hole, and it provides support to the piston pin 4 via its bottom surface.

[0052] In the example above, by setting the pin hole 61 as a blind hole and providing support for the piston pin 4 through the bottom surface of the pin hole 61, the connection structure between the piston pin 4 and the piston 6 can be simplified.

[0053] like Figure 9 As shown, the aforementioned piston 6 may be provided with an oil drain hole 63 that communicates with the bottom of the pin hole 61, so as to collect refrigeration oil more efficiently and ensure that the oil sump height inside the compressor is not too low, thus lubricating the system.

[0054] The present invention also provides a piston compressor, which may include the pump body structure of any of the above. Because the piston compressor adopts the above-described pump body structure, the force exerted by the connecting rod 3 on the piston 6 moving towards the first cylinder wall 101 is opposite in direction to the force exerted by the elastic member 5 on the piston 6 moving towards the second cylinder wall 102. Thus, the force exerted by the elastic member 5 on the piston 6 can counteract the lateral force exerted by the connecting rod 3 on the piston 6, thereby balancing the lateral force during the reciprocating motion of the piston 6, reducing the frictional resistance between the piston 6 and the side wall of the cylinder 1, and reducing both frictional power consumption and noise.

[0055] For ease of understanding, the overall structure of the present invention will be described below, and its working principle will be explained.

[0056] This invention proposes a reciprocating piston compressor with reduced lateral force, comprising a cylinder 1, a crankshaft 2, a connecting rod 3, a piston pin 4, an elastic element 5, and a piston 6. The cylinder 1 has a cylinder bore 10, the piston pin 4 has a mounting hole 41, and the piston 6 has a pin hole 61, a clearance hole 62, and an oil leakage hole 63 located at the bottom of the pin hole 61.

[0057] like Figure 3-9 As shown, cylinder 1, crankshaft 2, connecting rod 3, piston 6, and piston pin 4 constitute a conventional pump body motion structure. Crankshaft 2 rotates under the drive of a motor, and crankshaft 2 drives piston 6 to reciprocate within cylinder 1 via connecting rod 3. The two ends of elastic element 5 are respectively installed in mounting holes 41 on the second cylinder wall 102 and on piston pin 4. Elastic element 5 passes through clearance hole 62 to connect the second cylinder wall 102 and piston pin 4. Piston pin 4 is located within pin hole 61. An oil leakage hole 63 is provided at the bottom of pin hole 61.

[0058] In this process, piston 6 is driven by connecting rod 3 to reciprocate within cylinder 1. When piston 6 is at top dead center, crankshaft 2 rotates at 0 degrees, and the angle between connecting rod 3 and the axis of cylinder bore 10 is 0 degrees. Piston 6 is pulled to bottom dead center by connecting rod 3 via piston pin 4. As the angle between connecting rod 3 and the axis of cylinder bore 10 gradually increases, piston pin 4 is pulled by connecting rod 3 and tends to move towards the first cylinder wall 101. At this time, the lateral force of piston 6 on the first cylinder wall 101 increases from small to large. When crankshaft 2 rotates at 90 degrees, the angle between connecting rod 3 and the axis of cylinder bore 10 is at its maximum, and the lateral force also reaches its maximum value. Because connecting rod 3 pulls piston pin 4, it causes displacement towards the first cylinder wall 101. At this time, the displacement of elastic element 5 also reaches its maximum value, and the elastic force towards the second cylinder wall 102 reaches its maximum. The two forces are equal in magnitude and opposite in direction, thus canceling each other out and achieving the purpose of balancing the lateral forces. Correspondingly, the process of piston 6 moving from bottom dead center to top dead center (the crankshaft 2 rotating from 180 degrees to 360 degrees) also serves to eliminate most of the lateral force.

[0059] By adopting the technical solution of the present invention, the lateral force of the reciprocating piston compressor can be significantly reduced, the frictional power consumption between the piston 6 and the cylinder wall of the reciprocating piston compressor can be significantly reduced, and the vibration noise of the reciprocating piston compressor can be significantly reduced.

[0060] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0061] The above description is merely a preferred embodiment of the present invention and is 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 description is only a preferred embodiment 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 structure for a piston compressor, characterized in that: The system includes a cylinder (1), a piston (6), and a connecting rod (3). The cylinder bore (10) of the cylinder (1) has opposing first cylinder walls (101) and second cylinder walls (102). The piston (6) is movably disposed within the cylinder bore (10). The connecting rod (3) is connected to the piston (6) and is driven to move the piston (6) reciprocally between the first cylinder wall (101) and the second cylinder wall (102) between the top dead center and the bottom dead center. When the piston (6) is located between the top dead center and the bottom dead center, the connecting rod (3) applies a force to the piston (6) to move towards the first cylinder wall (101). The piston compressor pump body structure further includes an elastic element (5), one end of which is connected to the second cylinder wall (102), and the other end of which is connected to the piston (6). The elastic element (5) is used to apply a force to the piston (6) towards the second cylinder wall (102) when the piston (6) is between the top dead center and the bottom dead center, so as to balance the lateral force in the reciprocating motion of the piston and reduce the frictional resistance between the piston and the cylinder side wall.

2. The pump body structure of the piston compressor according to claim 1, characterized in that: When the piston (6) is between the top dead center and the bottom dead center, the force exerted by the connecting rod (3) on the piston (6) to move toward the first cylinder wall (101) is equal to the force exerted by the elastic member (5) on the piston (6) to move toward the second cylinder wall (102).

3. The pump body structure of the piston compressor according to claim 1, characterized in that: It also includes a piston pin (4) disposed on the piston (6), and the connecting rod (3) is connected to the piston (6) through the piston pin (4); The other end of the elastic element (5) is connected to the piston (6) via the piston pin (4).

4. The pump body structure of the piston compressor according to claim 3, characterized in that: The piston (6) is provided with a clearance hole (62) through which the elastic element (5) passes. When the piston (6) is located between the top dead center and the bottom dead center, the elastic element (5) does not come into contact with the side wall of the clearance hole (62).

5. The pump body structure of the piston compressor according to claim 4, characterized in that: The clearance hole (62) is a through hole that extends from one end of the piston (6) along the axial direction of the piston to the middle of the piston (6).

6. The pump body structure of the piston compressor according to claim 4 or 5, characterized in that: The number of elastic elements (5) is two or more, and the number of clearance holes (62) is equal to the number of elastic elements (5) and corresponds one-to-one; Among them, each elastic element (5) is arranged sequentially at intervals along the axial direction of the piston pin (4).

7. The pump body structure of the piston compressor according to any one of claims 3 to 5, characterized in that: The piston (6) is provided with a pin hole (61) for mounting the piston pin (4); wherein the pin hole (61) is a blind hole and the pin hole (61) provides support to the piston pin (4) through the bottom surface.

8. The pump body structure of the piston compressor according to claim 7, characterized in that: The piston (6) is provided with an oil leakage hole (63) that communicates with the bottom of the pin hole (61).

9. A piston compressor, characterized in that: The pump body structure includes any one of claims 1-8.

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