Piston structure, pump body assembly and fluid machine

Abstract

The invention provides a piston structure, a pump body assembly and a fluid machine. The piston structure comprises a piston body which is of a cylindrical structure, and extrusion faces are arranged at the two ends in the axial direction of the piston body respectively. The adapter is detachably connected with the piston body, the adapter comprises a connecting column, and the connecting column is used for being connected with a connecting rod of a pump body assembly. The problem that in the prior art, fluid machinery is low in performance is solved.

Description

Technical Field

[0001] This invention relates to the field of heat exchange equipment technology, and more specifically, to a piston structure, a pump assembly, and fluid machinery. Background Technology

[0002] Piston compressors are common fluid machinery used in heat exchange equipment. Their basic principle is to compress gas through the reciprocating motion of a piston within a cylinder. Over a long period of development, piston compressors have been widely used in various fields such as industry, refrigeration, automotive, and aerospace. However, with the increasing demands for equipment performance in modern industry, under high-load and high-frequency operating conditions, traditional single-sided compression pistons, which can only compress gas in one direction, suffer from low compression efficiency. Unilateral force easily generates unbalanced inertial forces, leading to significant vibration and noise, and they are difficult to meet the high-performance requirements of efficient, compact, and low-noise applications, resulting in the overall low performance of existing piston compressors.

[0003] As can be seen from the above, the existing technology suffers from the problem of low performance of fluid machinery. Summary of the Invention

[0004] The main objective of this invention is to provide a piston structure, a pump assembly, and fluid machinery to solve the problem of low performance of fluid machinery in the prior art.

[0005] To achieve the above objectives, according to one aspect of the present invention, a piston structure is provided, comprising: a piston body having a cylindrical structure and having extrusion surfaces at both ends along its axial direction; and an adapter detachably connected to the piston body, the adapter including a connecting post for connecting to a connecting rod of a pump body assembly.

[0006] Furthermore, the adapter is snapped into place with the piston body.

[0007] Furthermore, one of the adapter and the piston body has a snap-fit ​​part, and the other has a snap-fit ​​groove, with the snap-fit ​​part and the snap-fit ​​groove engaging in a snap-fit ​​engagement.

[0008] Furthermore, the adapter has a snap-fit ​​portion, and the peripheral side of the piston body has a snap-fit ​​groove, which is an eccentric groove extending radially along the piston body.

[0009] Furthermore, the groove includes a first groove segment and a second groove segment that are sequentially connected radially along the piston body. The axial length of the first groove segment is less than the axial length of the second groove segment to form a limiting step. The first groove segment is used to avoid at least a part of the adapter, and the second groove segment engages with the locking part.

[0010] Furthermore, the eccentric distance E between the slot and the central axis of the piston body satisfies 3 / 5 ≤ E / R ≤ 4 / 5 with respect to the radius R of the piston body.

[0011] Furthermore, the piston body has a first oil groove that extends circumferentially along the piston body and is connected to the slot at both ends.

[0012] Furthermore, there is at least one first oil groove, and when there are multiple first oil grooves, the multiple first oil grooves are spaced apart along the axial direction of the piston body.

[0013] Furthermore, the piston body has a cavity that extends radially through the piston body and is connected to the slot.

[0014] Furthermore, the adapter also includes a reinforcing plate, which is disposed on the snap-fit ​​part, and the connecting post is placed on the reinforcing plate.

[0015] Furthermore, the adapter is provided with a second oil groove, which extends sequentially along the connecting column and the reinforcing plate.

[0016] Furthermore, the piston body and / or adapter have a spatially symmetrical structure.

[0017] According to another aspect of the invention, a pump body assembly is also provided, including a connecting rod and the piston structure described above, wherein a connecting post of the piston structure is connected to the connecting rod.

[0018] According to another aspect of the invention, a fluid machine is also provided, comprising the pump body assembly described above.

[0019] Applying the technical solution of this invention, the piston structure includes a piston body and an adapter. The piston body is a cylindrical structure with compression surfaces at both ends along its axial direction. The adapter is detachably connected to the piston body and includes a connecting post for connecting to the connecting rod of the pump assembly. By setting the piston body as a double-ended piston, gas compression can be achieved in both strokes of the reciprocating motion, effectively improving the compression capacity per unit time. Furthermore, bidirectional compression can be achieved with a single cylinder, eliminating the need for an additional return mechanism or multiple cylinders, simplifying the system structure and saving space. The piston body is connected to the connecting rod via an external adapter, reducing the number of connecting rods. The wear between the outer wall and the piston cavity is reduced. In addition, the piston body is subjected to uniform force in both directions, which can effectively balance the unbalanced inertial force inside the fluid machinery, thereby reducing vibration and noise caused by asymmetrical force. The piston body of the double-ended piston type can also maintain the uniformity of load distribution under working conditions with large load changes, thereby reducing local wear and extending service life. As a result, the fluid machinery with the above-mentioned piston structure has high compression efficiency, low vibration and noise, higher load adaptability, reliability and service life, as well as a compact structure, which greatly improves the overall performance of the fluid machinery and solves the problem of low performance of fluid machinery in the prior art. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0021] Figure 1 A perspective view of the piston structure and connecting rod assembly in a specific embodiment of the present invention is shown;

[0022] Figure 2 A top view of a piston structure according to a specific embodiment of the present invention is shown;

[0023] Figure 3 A cross-sectional view of a piston structure according to a specific embodiment of the present invention is shown;

[0024] Figure 4 A perspective view of the piston body in a specific embodiment of the present invention is shown;

[0025] Figure 5 A perspective view of an adapter according to a specific embodiment of the present invention is shown;

[0026] Figure 6 A side view of an adapter according to a specific embodiment of the present invention is shown.

[0027] The above figures include the following reference numerals:

[0028] 10. Piston body; 11. Extrusion surface; 12. Slot; 121. First groove section; 122. Second groove section; 13. First oil groove; 14. Cavity; 20. Adapter; 21. Connecting post; 22. Snap-fit ​​part; 23. Reinforcing plate; 24. Second oil groove; 30. Connecting rod; 31. Small end; 32. Large end. Detailed Implementation

[0029] 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. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] To address the issue of low performance in existing fluid machinery, this invention provides a piston structure, a pump assembly, and a fluid machine. The pump assembly includes the piston structure described below. The fluid machine includes the pump assembly described below.

[0031] like Figures 1 to 4 As shown, the piston structure includes a piston body 10 and an adapter 20. The piston body 10 is a cylindrical structure with extrusion surfaces 11 at both ends along its axial direction. The adapter 20 is detachably connected to the piston body 10 and includes a connecting post 21 for connecting to the connecting rod 30 of the pump body assembly.

[0032] The technical solution of this application sets the piston body 10 as a double-ended piston, enabling gas compression in both strokes of the reciprocating motion, effectively improving the compression capacity per unit time. Furthermore, bidirectional compression can be achieved with a single cylinder, eliminating the need for additional return mechanisms or multiple cylinders, simplifying the system structure and saving space. The piston body 10 is connected to the connecting rod 30 via an external adapter 20, reducing wear between the connecting rod's outer wall and the piston's inner cavity. In addition, the piston body 10 experiences uniform force in both directions, effectively balancing unbalanced inertial forces within the fluid machinery, thereby reducing vibration and noise caused by asymmetrical forces. The double-ended piston body 10 also maintains uniform load distribution under conditions of large load variations, reducing localized wear. Therefore, the fluid machinery with the aforementioned piston structure of this application exhibits high compression efficiency, low vibration and noise, higher load adaptability, longer service life, and a compact structure, significantly improving the overall performance of the fluid machinery.

[0033] In this embodiment, as Figures 1 to 3 As shown, the two ends of the connecting rod 30 are a small end 31 and a large end 32, respectively. The connecting post 21 is connected to the small end 31, and the crankshaft of the pump body assembly is connected to the large end 32. Driven by the motor, the connecting rod 30 converts the rotation of the crankshaft into the reciprocating motion of the piston body 10 within the cylinder.

[0034] In this embodiment, the adapter 20 is snap-fitted into the piston body 10. Of course, the adapter 20 can also be connected to the piston body 10 by other means such as threads or bolts, which can be selected according to actual needs.

[0035] Specifically, such as Figures 1 to 6 As shown, the adapter 20 has a snap-fit ​​portion 22, and the peripheral side of the piston body 10 has a slot 12, with the snap-fit ​​portion 22 engaging with the slot 12. Alternatively, the piston body 10 may have a snap-fit ​​portion 22, and the adapter 20 may have a slot 12; the choice can be made based on actual requirements.

[0036] In this embodiment, the slot 12 is an eccentric groove extending in a direction parallel to the radial direction of the piston body 10. It should be noted that the eccentricity mentioned above is relative to the central axis of the piston body 10. That is, in this embodiment, the slot 12 does not pass through the central axis of the piston body 10, but is located on a surface position relatively close to the circumferential side of the piston body 10. This arrangement further ensures that the piston body 10 experiences uniform force in the reciprocating motion direction, thereby effectively balancing the unbalanced inertial forces within the fluid machinery and reducing vibration and noise caused by asymmetrical force.

[0037] Specifically, such as Figures 1 to 4 As shown, the groove 12 includes a first groove segment 121 and a second groove segment 122 that are sequentially connected radially along the piston body 10. The axial length of the first groove segment 121 is less than the axial length of the second groove segment 122 to form a limiting step. The first groove segment 121 is used to avoid at least a portion of the adapter 20, and the second groove segment 122 engages with the locking part 22. It can be understood that the first groove segment 121 extends outward to the circumferential side of the piston body 10. The groove 12 as a whole looks similar to a notch structure on the circumferential side of the piston body 10. The limiting direction between the locking part 22 and the second groove segment 122 is the axial direction of the piston body 10, which is the direction of movement of the piston body 10, so that the connecting rod 30 can stably drive the piston body 10 to move.

[0038] In this embodiment, the slot 12 can be considered as being formed by cutting the peripheral side of the piston body 10 with a convex-shaped cutting element. The cutting direction of the cutting element is parallel to the radial direction of the piston body 10. It can be understood that both the first slot segment 121 and the second slot segment 122 extend radially along the piston body 10.

[0039] In this embodiment, the snap-fit ​​portion 22 is a square plate structure. Obviously, when the adapter 20 is connected to the piston body 10, the snap-fit ​​portion 22 is also parallel to the axial or radial direction of the piston body 10. By setting the snap-fit ​​portion 22 to connect with the piston body 10, it is possible to effectively prevent the connecting rod 30 from directly colliding and rubbing against the piston body 10, thereby reducing the wear on the surface of the piston body 10 and extending its service life. Furthermore, the aforementioned plate structure increases the contact area between the adapter 20 and the piston body 10, thereby improving the connection stability.

[0040] In this embodiment, as Figure 3As shown, the eccentric distance E between the slot 12 and the central axis of the piston body 10 satisfies 3 / 5 ≤ E / R ≤ 4 / 5 with respect to the radius R of the piston body 10. Specifically, the eccentric distance E refers to the distance between the bottom surface of the second slot segment 122 and the central axis of the piston body 10. Therefore, in this embodiment, the slot 12 does not need to have a large depth, but is positioned relatively closer to the surface of the circumferential side of the piston body 10. By reasonably setting the position of the slot 12 within the piston body 10, the structural strength of the piston body 10 can be guaranteed while ensuring the stable connection between the adapter 20 and the piston body 10, thereby ensuring the operational reliability and service life of the piston body 10.

[0041] like Figures 1 to 4 As shown, the piston body 10 has a first oil groove 13. The first oil groove 13 extends circumferentially along the piston body 10, and its two ends are respectively connected to the retaining groove 12. Through the above arrangement, lubricating oil can be evenly delivered to the circumferential side of the piston body 10, ensuring sufficient lubrication between the piston outer wall and the cylinder bore. This not only reduces frictional resistance but also enhances sealing performance, thereby improving the stability and reliability of the system operation.

[0042] Furthermore, there is at least one first oil groove 13. When there are multiple first oil grooves 13, they are spaced apart along the axial direction of the piston body 10. Specifically, in this embodiment, there are two first oil grooves 13, which are located at both ends of the piston body 10.

[0043] like Figures 3 to 4 As shown, the piston body 10 has a cavity 14. The cavity 14 extends radially through the piston body 10 and communicates with the slot 12, specifically with the second groove segment 122. In this embodiment, the extending direction of the cavity 14 is perpendicular to the extending direction of the slot 12, that is, perpendicular to the bottom surface of the second groove segment 122. This design effectively reduces the overall weight of the piston body 10, which is beneficial for the overall weight reduction of the fluid machinery and improves its energy efficiency and ease of operation.

[0044] Furthermore, such as Figures 1 to 3 , Figures 5 to 6 As shown, the adapter 20 also includes a reinforcing plate 23. The reinforcing plate 23 is disposed on the snap-fit ​​part 22, and the connecting post 21 is placed on the reinforcing plate 23. By providing the reinforcing plate 23, the connection stability between the connecting post 21 and the snap-fit ​​part 22 and the overall structural strength of the adapter 20 can be improved.

[0045] In this embodiment, the connecting post 21 and the reinforcing plate 23, the reinforcing plate 23 and the snap-fit ​​part 22, or the connecting post 21, the reinforcing plate 23 and the snap-fit ​​part 22 and the adapter 20 are integrally formed.

[0046] Furthermore, such as Figures 5 to 6 As shown, the adapter 20 has a second oil groove 24. The second oil groove 24 extends sequentially along the connecting post 21 and the reinforcing plate 23. Specifically, the second oil groove 24 first extends vertically along the circumferential side of the connecting post 21, and then extends horizontally along the reinforcing plate 23 and connects to the outer edge of the reinforcing plate 23. Through the above arrangement, lubricating oil can be evenly delivered to the cavity of the piston body 10 and the inner wall of the connecting rod 30, realizing continuous lubrication of key moving parts, further reducing mechanical friction and wear, and improving the stability and reliability of system operation.

[0047] In this embodiment, the piston body 10 has a spatially symmetrical structure.

[0048] Specifically, regardless of whether the radial center cross-section or the axial center axis cross-section of the piston body 10 is taken as the plane of symmetry, the piston body 10 as a whole is a spatially symmetrical structure. Figure 3 Taking the direction shown as an example, the central cross-section of the piston body 10 along the radial direction is the plane containing the left and right symmetrical central axis, and the cross-section of the piston body 10 along the axial central axis is the plane containing the left and right symmetrical central axis. Figure 3 The cross-section shown is shown. The groove 12 is symmetrical about left and right with respect to the radial center cross-section of the piston body 10, and also about front and back with respect to the axial center axis cross-section of the piston body 10. Similarly, the two first oil grooves 13 and the cavity 14 are also symmetrical about left and right with respect to the radial center cross-section of the piston body 10, and also about front and back with respect to the axial center axis cross-section of the piston body 10.

[0049] Furthermore, the adapter 20 also has a spatially symmetrical structure. Specifically, the reinforcing plate 23 is square or racetrack-shaped and located at the center of the snap-fit ​​portion 22, and the connecting post 21 is also located at the center of the snap-fit ​​portion 22, thus being symmetrically arranged in the left-right and front-back directions. Through the above arrangement, the piston structure in this embodiment can be made to be subjected to uniform force in both directions, which can effectively balance the unbalanced inertial forces inside the fluid machinery, thereby reducing vibration and noise caused by asymmetrical force, and can also maintain the uniformity of load distribution under working conditions with large load changes, thereby reducing local wear and improving the overall performance of the fluid machinery.

[0050] like Figure 1 As shown, this application also provides a pump body assembly, including a connecting rod 30 and the piston structure described above, wherein the connecting post 21 of the piston structure is connected to the connecting rod 30.

[0051] This application also provides a fluid machine, including the pump assembly described above. In this embodiment, the fluid machine is a piston compressor.

[0052] As can be seen from the above description, the above embodiments of the present invention achieve the following technical effects: The technical solution of this application sets the piston body 10 into a double-ended piston form, so that the piston body 10 can achieve gas compression in both strokes of reciprocating motion, effectively improving the compression capacity per unit time. Moreover, the bidirectional compression function can be achieved by a single cylinder, without the need for additional return mechanism or multiple cylinders, simplifying the system structure and saving space. The piston body 10 is connected to the connecting rod 30 through an external adapter 20, reducing the wear between the outer wall of the connecting rod and the inner cavity of the piston. In addition, the piston body 10 is subjected to uniform force in both directions, which can effectively balance the unbalanced inertial force inside the fluid machinery, thereby reducing vibration and noise caused by asymmetrical force. The double-ended piston form of the piston body 10 can also maintain the uniformity of load distribution under working conditions with large load changes, thereby reducing local wear. As a result, the fluid machinery with the above-mentioned piston structure of this application has high compression efficiency, low vibration and noise, higher load adaptability, service life and compact structure, which greatly improves the overall performance of the fluid machinery.

[0053] 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.

[0054] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. 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 need not be further discussed in subsequent figures.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0060] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A piston structure, characterized in that, include: The piston body (10) is a cylindrical structure and has extrusion surfaces (11) at both ends along its axial direction. The adapter (20) is detachably connected to the piston body (10) and includes a connecting post (21) for connecting to the connecting rod (30) of the pump body assembly.

2. The piston structure according to claim 1, characterized in that, The adapter (20) is engaged with the piston body (10) in a snap-fit ​​connection.

3. The piston structure according to claim 2, characterized in that, The adapter (20) and the piston body (10) have a snap-fit ​​part (22) and a slot (12) respectively, and the snap-fit ​​part (22) and the slot (12) are engaged in a snap-fit ​​relationship.

4. The piston structure according to claim 3, characterized in that, The adapter (20) has the snap-fit ​​portion (22), and the peripheral side of the piston body (10) has the snap groove (12), which is an eccentric groove extending radially along the piston body (10).

5. The piston structure according to claim 4, characterized in that, The slot (12) includes a first slot segment (121) and a second slot segment (122) that are connected radially in sequence along the piston body (10). The axial length of the first slot segment (121) is less than the axial length of the second slot segment (122) to form a limiting step. The first slot segment (121) is used to avoid at least a part of the adapter (20). The second slot segment (122) engages with the snap-fit ​​part (22).

6. The piston structure according to claim 4, characterized in that, The eccentric distance E between the slot (12) and the central axis of the piston body (10) satisfies 3 / 5 ≤ E / R ≤ 4 / 5 with respect to the radius R of the piston body (10).

7. The piston structure according to claim 4, characterized in that, The piston body (10) has a first oil groove (13), which extends circumferentially along the piston body (10) and is connected to the slot (12) at both ends.

8. The piston structure according to claim 7, characterized in that, There is at least one first oil groove (13). When there are multiple first oil grooves (13), the multiple first oil grooves (13) are spaced apart along the axial direction of the piston body (10).

9. The piston structure according to claim 4, characterized in that, The piston body (10) has a cavity (14) which is arranged radially through the piston body (10) and is connected to the slot (12).

10. The piston structure according to claim 4, characterized in that, The adapter (20) also includes a reinforcing plate (23), which is disposed on the snap-fit ​​part (22), and the connecting post (21) is placed on the reinforcing plate (23).

11. The piston structure according to claim 10, characterized in that, The adapter (20) has a second oil groove (24) which extends sequentially along the connecting post (21) and the reinforcing plate (23).

12. The piston structure according to any one of claims 1 to 11, characterized in that, The piston body (10) and / or the adapter (20) are spatially symmetrical structures.

13. A pump body assembly, characterized in that, The piston structure includes a connecting rod (30) and a piston structure according to any one of claims 1 to 12, wherein the connecting post (21) of the piston structure is connected to the connecting rod (30).

14. A fluid machine, characterized in that, Includes the pump assembly as described in claim 13.

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