Piston and pump assembly

Abstract

The utility model relates to the technical field of compressors, and discloses a piston which comprises a piston body, the piston body is cylindrical, a first end face and a second end face are formed at the two ends of the piston body, and the first end face and the second end face are both located between the inner circumferential face of the piston body and the outer circumferential face of the piston body. A plurality of oil storage grooves are formed in the first end face and / or the second end face in the circumferential direction of the piston body, the distance between the oil storage grooves and the inner circumferential face of the piston body is D1, the distance between the oil storage grooves and the outer circumferential face of the piston body is D2, and the piston has the relational expression that D1 is smaller than or equal to D2. The piston has the following technical effects that the plurality of oil storage grooves are formed in the circumferential direction of the piston body, so that the lubricating effect between the piston and a support can be kept, and the mechanical strength of the piston cannot be influenced; and by setting the relationship between the D1 and the D2, the lubricity and the reliability of the pumping assembly are further improved. The utility model also discloses a pumping assembly.

Description

TECHNICAL FIELD

[0001] The utility model belongs to compressor technical field, concretely relates to a piston and pump assembly. BACKGROUND

[0002] The pump assembly of the compressor usually comprises a rotating shaft, a piston, a cylinder, an upper support and a lower support, the upper support, the piston and the lower support are sequentially sleeved on the rotating shaft from top to bottom, and the cylinder is sleeved on the outside of the piston. In the process of high-speed operation of the pump assembly, there is high friction between the piston and the upper support and the lower support, especially between the piston and the lower support, therefore, the refrigeration oil needs to be used for lubrication. Meanwhile, the existence of the refrigeration oil can also improve the sealing performance of the pump assembly due to the gap between the piston and the upper support and the lower support.

[0003] In the prior art, in order to increase the thickness of the oil film between the piston and the upper support and / or the lower support, an oil storage groove is arranged on the end face of the piston, however, the oil storage groove is arranged in a circumferential direction around the end face of the piston, although the lubrication effect of the pump assembly can be improved, the mechanical strength of the piston itself is reduced, thereby affecting the normal operation performance of the pump assembly, meanwhile, the position of the oil storage groove is far away from the inner circumferential surface of the piston, and the refrigeration oil stored in the oil storage groove is prone to leakage in the process of high-speed operation of the pump assembly, the thickness of the oil film cannot reach the expectation, and the sealing performance and the reliability of the pump assembly cannot be guaranteed. SUMMARY

[0004] In order to solve the problems in the prior art, the utility model provides a piston, a plurality of oil storage grooves are arranged in a circumferential direction of the piston body, the lubrication effect between the piston and the support can be maintained, and the mechanical strength of the piston is not affected, so that the normal performance of the pump assembly is guaranteed, the numerical relationship between D1 and D2 is set, and the lubrication and the reliability of the pump assembly are further improved. The utility model also provides a pump assembly.

[0005] The technical effects achieved by the utility model are realized through the following technical aspects:

[0006] In a first aspect, the utility model provides a piston, comprising a piston body, the piston body is cylindrical, two ends of the piston body are formed with a first end face and a second end face, the first end face and the second end face are located between the inner circumferential surface of the piston body and the outer circumferential surface of the piston body.

[0007] A plurality of oil storage grooves are arranged on the first end face and / or the second end face in a circumferential direction of the piston body, the distance between the oil storage groove and the inner circumferential surface of the piston body is D1, the distance between the oil storage groove and the outer circumferential surface of the piston body is D2, and the piston has a relationship: D1≤D2.

[0008] As a further description of the utility model technical scheme, the width of the oil storage groove is D3, the width of the first end face is D4, the piston has a relationship: 0.3D4≤D3≤0.5D4.

[0009] As a further description of the utility model technical scheme, the depth of the oil storage groove is 0.1-0.5mm.

[0010] As a further description of the utility model technical scheme, the oil storage groove is formed with an opening in communication with the outside, the area of the opening is 0.03-1.5mm 2 .

[0011] As a further description of the utility model technical scheme, a plurality of the oil storage grooves are distributed equidistantly along the circumference of the piston body, and the number of the oil storage grooves is 2-10.

[0012] As a further description of the utility model technical scheme, the oil storage groove is in the shape of a circular arc.

[0013] As a further description of the utility model technical scheme, the oil storage groove is in the shape of a parallelogram.

[0014] As a further description of the utility model technical scheme, a plurality of the oil storage grooves are distributed equidistantly along the circumference of the piston body, and the oil storage grooves are arranged in the tangential direction of the inner circumferential face of the piston body.

[0015] As a further description of the utility model technical scheme, the side of the oil storage groove close to the inner circumferential face of the piston body is in communication with the inner circumferential face of the piston body.

[0016] In the second aspect, the utility model provides a kind of pumping assembly, including rotating shaft, first support, second support, cylinder and the piston, the first support, the piston and the second support are sequentially from below to above and are set on the rotating shaft, the cylinder is set on the outside of the piston, the first end face is close to the first support, and the second end face is close to the second support.

[0017] Summarized above, the utility model at least has following advantages:

[0018] The piston provided by the utility model has the advantages that the plurality of oil storage grooves are arranged on the first end face and / or the second end face along the circumference of the piston body, the lubricating effect between the piston and the support can be maintained, the mechanical strength of the piston is not affected, the normal performance of the pump assembly is ensured, the position of the oil storage groove is closer to the inner circumferential surface of the piston body by setting the numerical relationship between D1 and D2, the oil film thickness of the first end face and / or the second end face on the side close to the inner circumferential surface of the piston body is increased, the sealing performance of the contact part between the piston and the support is improved, meanwhile, the friction area between the piston and the support is reduced, the invalid loss is reduced, and the lubricating performance and the reliability of the pump assembly are further improved.

[0019] The utility model provides a pump assembly, through setting above -mentioned piston, effectively improved the sealing performance and lubricating performance of pump assembly, reduced the invalid friction loss of pump body assembly, thereby be favorable to the energy efficiency and reliability of compressor are improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the overall structure schematic view of the piston of the utility model embodiment 1;

[0021] Figure 2 It is the end face structure schematic view of the piston of the utility model embodiment 1;

[0022] Figure 3 It is the end face structure schematic view of the piston of the utility model embodiment 2;

[0023] Figure 4 It is the end face structure schematic view of the piston of the utility model embodiment 3;

[0024] Figure 5 It is the cross section view of the pump assembly of the utility model embodiment 4.

[0025] Mark in drawing:

[0026] 1, piston body;11, first end face;12, second end face;13, oil storage groove;131, opening;

[0027] 100, rotating shaft;200, first support;300, second support;400, cylinder body;500, piston. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantage of the utility model embodiment clearer, the technical scheme in the utility model embodiment will be clearly and completely described below in combination with the drawings in the utility model embodiment. The described embodiment is a part of the embodiment of the utility model, not all the embodiments.

[0029] Therefore, the following detailed description of implementations of the application presented in the drawings is not intended to limit the scope of the application as claimed, but merely represents selected implementations of the application. Based on the implementations in the application, all other implementations obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the application.

[0030] Example 1

[0031] Reference Figures 1 to 2 The piston provided by the embodiment comprises a piston body 1, the piston body 1 is in a cylindrical shape, and a first end face 11 and a second end face 12 are formed at two ends of the piston body 1, and the first end face 11 and the second end face 12 are both located between an inner circumferential surface of the piston body 1 and an outer circumferential surface of the piston body 1. In the embodiment, the first end face 11 is located below the second end face 12, the first end face 11 is used to contact a lower support of a pumping assembly, and the second end face 12 is used to contact an upper support of the pumping assembly.

[0032] A plurality of oil storage grooves 13 are arranged on the first end face 11 at equal intervals in the circumferential direction of the piston body 1. Since there is a gap between each of the oil storage grooves 13, the lubricating effect between the first end face 11 and the lower support can be maintained, and the mechanical strength of the piston is not affected, thereby ensuring the normal operation performance of the pumping assembly. Further, the distance between the oil storage groove 13 and the inner circumferential surface of the piston body 1 is D1, the distance between the oil storage groove 13 and the outer circumferential surface of the piston body 1 is D2, and the piston has a relationship: D1≤D2, and preferably, D1<D2.

[0033] It can be understood that by setting the numerical relationship between D1 and D2, the position of the oil storage groove 13 is closer to the inner circumferential surface of the piston body 1, thereby increasing the oil film thickness on the side of the first end face 11 close to the inner circumferential surface of the piston body 1. During high-speed operation of the pumping assembly, since the lubricating oil is stored on the side of the first end face 11 close to the inner circumferential surface of the piston body 1, under the inertia of high-speed rotation of the piston, the lubricating oil can be well retained in the oil storage groove 13, without causing excessive leakage and loss, improving the sealing between the piston and the lower support, and at the same time, improving the lubricity between the piston and the lower support, reducing the friction area between the piston and the lower support, effectively reducing the invalid friction loss, and further improving the reliability of the pumping assembly.

[0034] In some embodiments, the width of the oil storage groove 13 is D3, the width of the first end surface 11 is D4, and the piston has a relationship of 0.3D4≤D3≤0.5D4. It should be noted that the width here refers to the radial width. By setting the numerical relationship between D3 and D4, sufficient lubricating oil storage capacity can be ensured, and the oil film thickness can meet the high lubrication and high sealing requirements of the piston, while the oil storage groove 13 does not occupy too much width range of the first end surface 11, and the mechanical strength of the piston is not affected.

[0035] In some embodiments, the depth of the oil storage groove 13 is 0.1-0.5mm, and the oil storage groove 13 is formed with an opening 131 communicating with the outside. The area of the opening 131 is 0.03-1.5mm 2 . It can be understood that the area of the opening 131 is equivalent to the flow area of the oil storage groove 13. By setting the depth and flow area of the oil storage groove 13, in combination with the above setting of the width of the oil storage groove 13, the volume of the oil storage groove 13 is within an optimal range, sufficient lubricating oil storage capacity is ensured, the oil film thickness between the piston and the lower support is increased, and the lubrication and sealing of the piston are effectively improved.

[0036] In the specific implementation process, the number of oil storage grooves 13 can be 2-10, and in this embodiment, the number of oil storage grooves 13 is 8.

[0037] The piston of the present embodiment can maintain the lubrication effect between the piston and the lower support, and will not affect the mechanical strength of the piston, thereby ensuring the normal performance of the pumping assembly. By setting the numerical relationship between D1 and D2, the position of the oil storage groove is closer to the inner circumferential surface of the piston body, the oil film thickness on the side of the first end surface close to the inner circumferential surface of the piston body is increased, the sealing between the piston and the lower support is effectively improved, the lubrication between the piston and the lower support is improved, the friction area between the piston and the support is reduced, the invalid loss is effectively reduced, and the reliability of the pumping assembly is further improved. By setting the numerical relationship between D3 and D4, sufficient lubricating oil storage capacity can be ensured, the oil film thickness can meet the high lubrication and high sealing requirements of the piston, while the oil storage groove does not occupy too much width range of the first end surface, the mechanical strength of the piston is not affected, and the normal operating performance of the pumping assembly is maintained. By setting the width, depth and flow area of the oil storage groove, the volume range of the oil storage groove is optimized, sufficient lubricating oil storage capacity is ensured, the oil film thickness between the piston and the lower support is increased, and the lubrication and sealing of the piston are effectively improved.

[0038] Embodiment 2

[0039] As a further optimization of Embodiment 1, reference is made to Figure 3In the embodiment, the oil storage groove 13 is in the shape of an arc, and the center of each oil storage groove 13 is located on the axis of the piston body 1. In the embodiment, D1 < D2, and the interval distance between two adjacent oil storage grooves 13 is less than or equal to half of the arc length of the oil storage groove 13. In this way, the circumferential coverage of the oil storage groove 13 on the first end face 11 can be improved, and the mechanical strength of the piston body 1 can be avoided from being affected, which is beneficial to further improve the lubricity, sealing performance and reliability of the pumping assembly.

[0040] Embodiment 3

[0041] As a further optimization of embodiment 1, reference is made to Figure 4 In the embodiment, the oil storage groove 13 is in the shape of a parallelogram. A plurality of oil storage grooves 13 are distributed equidistantly along the circumference of the piston body 1, and the oil storage grooves 13 are arranged in the tangential direction of the inner circumferential surface of the piston body 1, and the arrangement direction of the oil storage grooves 13 conforms to the rotation direction of the piston. In this way, during high-speed rotation of the piston, the lubricating oil can quickly fill the oil storage groove 13, and under the action of rotational inertia, an oil film is quickly formed between the first end face 11 and the lower support, which has a better sealing and lubricating effect, and further improves the reliability of the pumping assembly.

[0042] As a further optimization, the side of the oil storage groove 13 close to the inner circumferential surface of the piston body 1 is in communication with the inner circumferential surface of the piston body 1. Since the lubricating oil enters between the first end face 11 and the lower support from below the piston during high-speed rotation of the piston, that is, the lubricating oil spreads from the inner circumferential surface to the outer circumferential surface of the piston body 1, therefore, by setting the oil storage groove 13 in communication with the inner circumferential surface of the piston body 1, the lubricating oil can enter the oil storage groove 13 more quickly, and the lubrication and sealing requirements of the pumping assembly can be met in a short time, which is beneficial to improve the operation performance of the pumping assembly.

[0043] Embodiment 4

[0044] Reference is made to Figure 5 The pumping assembly provided in the embodiment includes a rotating shaft 100, a first support 200, a second support 300, a cylinder body 400 and the piston 500 of embodiment 2 or 3. The first support 200, the piston 500 and the second support 300 are sequentially sleeved on the rotating shaft 100 from bottom to top, the cylinder body 400 is sleeved on the outside of the piston 500, the first end face 11 is close to the first support 200 and abuts against the first support 200, and the second end face 12 is close to the second support 300 and abuts against the second support 300.

[0045] The oil storage groove 13 is arranged on the first end face 11, abuts against the first support 200 through the first end face 11, forms a containing space between the oil storage groove 13 and the first support 200, meanwhile, a gap is formed between the abutting faces of the first end face 11 and the first support 200, the lubricating oil can be filled in the containing space and the gap to continuously play the lubricating and sealing roles. By arranging the oil storage groove 13 on the first end face 11 of the piston 500, the oil film thickness between the piston 500 and the first support 200 can be increased, the lubricating and sealing properties of the pump assembly are improved, the mechanical strength requirement of the piston 500 for the pump assembly is met, and the reliability of the pump assembly is ensured.

[0046] The pump assembly of the embodiment increases the oil film thickness between the piston and the first support through the piston of the embodiments 2 or 3, effectively improves the sealing and lubricating properties of the pump assembly, reduces the friction area between the piston and the first support, effectively reduces the invalid friction loss of the pump body assembly, and is beneficial to improving the reliability and energy efficiency of the compressor.

[0047] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix" and so on should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be direct connection, also can pass through intermediate medium indirectly connect, can be two element inside's intercommunication or two element's mutual action relationship.For ordinary skilled person in the art, can understand the concrete meaning of above-mentioned terms in the utility model according to specific circumstances.

[0048] In the description of the utility model, it is necessary to explain that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship commonly placed when the utility model product is used, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0049] In the utility model, unless another definite provision and limitation, first feature is above or below second feature can include that first and second features are in direct contact, also can include that first and second features are not in direct contact but contact through additional feature between them.

[0050] Although the description of the utility model is combined with above specific embodiment, it is obvious that many substitutions, modifications and changes can be made according to the above-mentioned content by the person skilled in the art. Therefore, all such substitutions, improvements and changes are included in the spirit and scope of the appended claims.

Claims

1. A piston characterized by, The piston body (1) is cylindrical, and first and second end faces (11, 12) are formed at both ends of the piston body (1) between the inner circumferential surface of the piston body (1) and the outer circumferential surface of the piston body (1); A plurality of oil storage grooves (13) are arranged on the first and / or second end faces (11, 12) in the circumferential direction of the piston body (1), the distance between the oil storage grooves (13) and the inner circumferential surface of the piston body (1) is D1, the distance between the oil storage grooves (13) and the outer circumferential surface of the piston body (1) is D2, and the piston has the relationship D1≤D2.

2. The piston of claim 1 wherein, The width of the oil storage grooves (13) is D3, the width of the first end face (11) is D4, and the piston has the relationship 0.3D4≤D3≤0.5D4.

3. The piston of claim 1 wherein, The depth of the oil storage grooves (13) is 0.1-0.5 mm.

4. The piston of claim 1 wherein, The oil storage tank (13) is formed with an opening (131) communicating with the outside, the area of the opening (131) is 0.03-1.5mm 2 .

5. The piston of claim 1 wherein, The plurality of oil storage grooves (13) are equally spaced in the circumferential direction of the piston body (1), and the number of the oil storage grooves (13) is 2-10.

6. The piston of claim 1 wherein, The oil storage grooves (13) are circular arcs.

7. The piston of claim 1 wherein, The oil storage grooves (13) are parallelograms.

8. The piston of claim 7 wherein, The plurality of oil storage grooves (13) are equally spaced in the circumferential direction of the piston body (1), and the oil storage grooves (13) are arranged in the tangential direction of the inner circumferential surface of the piston body (1).

9. The piston of claim 8 wherein, The side of the oil storage grooves (13) close to the inner circumferential surface of the piston body (1) is in communication with the inner circumferential surface of the piston body (1).

10. A pumping assembly characterized by, The piston (500) of any one of claims 1-9, the first support (200), the piston (500), and the second support (300) are sequentially sleeved on the rotating shaft (100) from bottom to top, the cylinder (400) is sleeved on the outside of the piston (500), the first end face (11) is close to the first support (200), and the second end face (12) is close to the second support (300).

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