Piston, pump body, piston compressor and refrigeration equipment

Abstract

The utility model provides a piston, pump body, piston compressor and refrigeration equipment, the piston is provided with a first end and a second end which are opposite to each other, the first end is a compression end, the outer wall of the piston is provided with an oil groove, and the oil groove is located between the first end and the second end; the piston is further provided with an oil guide structure, and the oil guide structure is used for guiding oil in the oil groove out of the second end. Compared with the prior art, the oil guide structure is additionally arranged on the piston to guide oil in the oil groove out of the second end, the oil return capacity of the piston is improved, the amount of lubricating oil discharged out of the compressor is reduced, and therefore the amount of oil in the piston compressor can be guaranteed, and the overall reliability of the compressor is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of piston compressors, and particularly relates to a piston, a pump body, a piston compressor and a refrigeration device. Background Art

[0002] The essence of a piston compressor is to compress a refrigerant gas at low temperature and low pressure into a refrigerant gas at high temperature and high pressure in a cylinder, so as to provide refrigeration capacity. In the household refrigerator and freezer industry, the piston compressor, as its core component, plays an irreplaceable role, and its reliable performance determines the service life of the refrigerator. Among them, the refrigeration oil is the key to ensuring the reliability of the piston compressor. Therefore, reducing the amount of oil discharged into the system and ensuring the amount of oil inside the piston compressor are the main technical problems.

[0003] Figure 1 and Figure 2 provides a schematic diagram of a conventional piston in the prior art. As Figure 1 and Figure 2 shown, only an oil groove 101 is provided on the outer wall of the piston 1 in the prior art. During the operation of the piston compressor, a large amount of lubricating oil will accumulate in the oil groove 101. These lubricating oils are easy to fuse with the refrigerant gas in the cylinder bore and be discharged into the pipeline of the refrigeration system, resulting in an increase in the oil discharge amount of the piston compressor, thereby causing a decrease in the amount of lubricating oil inside the piston compressor, making it impossible to lubricate the inside of the piston compressor in time and reducing the reliability of the piston compressor. Summary of the Utility Model

[0004] Therefore, the utility model provides a piston, a pump body, a piston compressor and a refrigeration device. The technical problem to be solved is: how to reduce the discharge of refrigeration oil inside the piston compressor and ensure the amount of oil inside the piston compressor.

[0005] To solve the above problems, the utility model provides a piston. The piston has opposite first and second ends. The first end is the compression end. An oil groove is provided on the outer wall of the piston. The oil groove is located between the first end and the second end. A oil guiding structure is further provided on the piston. The oil guiding structure is used to guide the oil liquid in the oil groove out from the second end.

[0006] In some embodiments, the oil guiding structure includes an oil drain groove provided on the outer wall of the piston. The oil drain groove extends from the end face of the second end to the oil groove along the center line direction of the piston. The oil guiding structure guides the oil liquid in the oil groove out from the second end through the oil drain groove.

[0007] In some embodiments, the oil drain groove is a flat groove.

[0008] In some embodiments, the number of the oil drain grooves is more than two, and they are evenly distributed around the central axis of the piston.

[0009] In some embodiments, the oil groove is annular and is arranged around the central axis of the piston; the oil groove divides the piston into a first section and a second section along its central axis direction, the first section has the first end as described above, and the second section has the second end as described above; wherein, the oil guiding structure is arranged on the second section.

[0010] In some embodiments, when the oil guiding structure includes an oil drain groove arranged on the outer wall of the piston and the oil drain groove is a flat groove,

[0011] the first section is cylindrical, and the distance between the flat groove and the central axis of the piston is less than the radius of the first section; and / or, the second section is a prism structure, and each prism surface of the prism structure forms an oil drain groove.

[0012] In some embodiments, in a cross-section coinciding with the central axis of the piston, the cross-sectional profile of the oil groove is arc-shaped.

[0013] The present utility model further provides a pump body or a piston compressor, which includes the piston described in any one of the above.

[0014] The present utility model further provides a refrigeration device, which includes a piston compressor, and the piston compressor includes the piston described in any one of the above.

[0015] In some embodiments, the refrigeration device is a refrigerator or a freezer.

[0016] A piston, a pump body, a piston compressor and a refrigeration device provided by the present utility model have the following beneficial effects:

[0017] 1. Compared with the prior art, by adding an oil guiding structure on the piston to lead out the oil in the oil groove from the second end, the present utility model realizes the improvement of the piston oil return capacity, reduces the amount of lubricating oil discharged outside the compressor, thereby ensuring the oil amount inside the piston compressor and improving the overall reliability of the compressor.

[0018] 2. The design of the oil drain groove can reduce the contact area between the piston and the inner wall of the cylinder hole while ensuring the stable operation of the piston, reduce the frictional loss, and lower the exhaust temperature to a certain extent. Description of the Drawings

[0019] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. The accompanying drawings in the following description are merely exemplary. For those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained based on the provided drawings.

[0020] Figure 1 A schematic structural diagram of a piston in the prior art is provided;

[0021] Figure 2 is Figure 1 a schematic structural diagram of the other perspective of the piston in

[0022] Figure 3 A schematic structural diagram of a piston of the present invention is provided;

[0023] Figure 4 is Figure 3 a schematic structural diagram of the other perspective of the piston in

[0024] Figure 5 A schematic assembly diagram of the piston and the cylinder block of the present invention;

[0025] Figure 6 is Figure 5 an enlarged schematic diagram of part A in

[0026] The reference numerals are as follows:

[0027] 1, piston; 3, cylinder block; 1a, first section; 1b, second section; 11, first end; 12, second end; 31, cylinder bore; 101, oil groove; 102, oil drain groove. Specific embodiments

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The description of at least one exemplary embodiment below is actually only illustrative and in no way limits the present invention and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0029] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description. Without contrary description, these orientation terms do not indicate and imply that the device or component referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the protection scope of the present utility model; the orientation terms "inner, outer" refer to the inside and outside relative to the contour of each component itself.

[0030] For the convenience of description, spatial relative terms such as "above...", "above...", "on the upper surface of...", "upper" etc. can be used here to describe the spatial positional relationship between a device or feature shown in the figure and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the figure for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "above other devices or structures" will then be positioned as "below other devices or structures" or "beneath other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations are made for the spatial relative descriptions used here.

[0031] In addition, it should be noted that using words such as "first", "second", etc. to limit components is only for the convenience of distinguishing the corresponding components. Without otherwise stating, the above words have no special meaning. Therefore, it should not be construed as a limitation to the protection scope of the present utility model.

[0032] Referring to Figures 3 - 6 As shown, according to an embodiment of the present utility model, a piston 1 is provided. The piston 1 has opposite first end 11 and second end 12. The first end 11 is the compression end, and the piston 1 compresses the refrigerant through the first end 11. An oil groove 101 is provided on the outer wall of the piston 1. The oil groove 101 is located between the first end 11 and the second end 12. Wherein, a oil guiding structure is further provided on the piston 1, and the oil guiding structure is used to guide the oil in the oil groove 101 out from the second end 12.

[0033] Compared with the prior art, the present utility model realizes the improvement of the oil return ability of the piston 1 by adding an oil guiding structure on the piston 1 to guide the oil in the oil groove 101 out from the second end 12, reduces the amount of lubricating oil discharged outside the compressor, thereby ensuring the oil amount inside the piston compressor and improving the overall reliability of the compressor.

[0034] In some embodiments, such as Figure 3 and Figure 4 shown, the aforementioned oil guiding structure may include an oil drain groove 102 provided on the outer wall of the piston 1. The oil drain groove 102 extends from the end face of the second end 12 to the oil groove 101 along the center line direction of the piston 1. The oil guiding structure discharges the oil in the oil groove 101 from the second end 12 through the oil drain groove 102.

[0035] In the above example, the oil drain groove 102 is communicated with the aforementioned oil groove 101. During the reciprocating motion, the oil drain groove 102 discharges the lubricating oil accumulated in the oil groove 101 from the second end 12. These lubricating oils flow back into the pump body of the piston compressor, thereby reducing the content of lubricating oil in the mixed gas discharged by the piston compressor. In addition, the design of the oil drain groove 102 can also reduce the contact area between the piston 1 and the inner wall of the cylinder bore 31 while ensuring the stable operation of the piston 1, reduce frictional losses, and reduce a certain exhaust temperature.

[0036] In some embodiments, the number of the aforementioned oil drain grooves 102 may be more than two and are evenly distributed around the center line of the piston 1. Among them, a larger number of oil drain grooves 102 can improve the efficiency of discharging the oil in the oil groove 101 from the second end 12.

[0037] In some embodiments, such as Figure 3 and Figure 4 shown, the aforementioned oil groove 101 may be a flat groove.

[0038] In the above example, the flat groove can be machined on the piston 1, which is beneficial to directly machining the existing piston 1 to obtain the piston 1 of the present invention.

[0039] In some embodiments, such as Figure 3 and Figure 4 shown, the aforementioned oil groove 101 may be annular and is arranged around the center line of the piston 1. The oil groove 101 divides the piston 1 into a first section 1a and a second section 1b along its center line direction. The first section 1a has the aforementioned first end 11, and the second section 1b has the aforementioned second end 12. Among them, the oil guiding structure is provided on the second section 1b.

[0040] In the above example, by arranging the oil guiding structure on the second section 1b, the influence of the oil guiding structure on the first section 1a can be avoided to ensure the normal compression function of the first end 11 of the piston 1.

[0041] In a specific application example, when the oil guiding structure includes an oil drain groove 102 provided on the outer wall of the piston 1 and the oil drain groove 102 is a flat groove, the aforementioned first section 1a may be cylindrical. And the distance between the flat groove and the center line of the piston 1 is less than the radius of the first section 1a.

[0042] like Figure 5 and Figure 6 As shown, the first section 1a can cooperate with the circular cylinder hole 31 to compress the refrigerant to ensure the stable operation of the piston 1 in the cylinder hole 31. Since the distance between the flat groove and the center line of the piston 1 is smaller than the radius of the first section 1a, there is a gap between the flat groove and the inner wall of the cylinder hole 31, so that the oil in the oil groove 101 can flow out from the second end 12 of the piston 1 along the flat groove.

[0043] In a specific application example, Figure 3 and Figure 4 As shown, the aforementioned second section 1b may be a prism structure, and each edge face of the prism structure forms one of the aforementioned flat grooves.

[0044] In the above example, by processing the second section 1b into a prismatic structure, the oil in the oil groove 101 is guided out through the flat groove formed by the prism surface, and the overall force on the second section 1b of the piston 1 can be made more uniform.

[0045] It should be noted that the conventional piston 1 is cylindrical, and the cylindrical surface at the tail of the conventional piston 1 can be evenly cut off to form a prism structure by machining to form the structure of the piston 1 of the utility model. Each edge of the prism structure forms a flat groove as mentioned above, and the flat groove is a smooth plane. The front part of the conventional piston 1 still retains the cylindrical structure to ensure the stable operation of the piston 1 in the cylinder hole 31.

[0046] In some embodiments, in the cross section coinciding with the center line of the piston 1 , the cross-sectional profile of the oil groove 101 may be arc-shaped, so that the groove wall of the oil groove 101 is smoother, which is beneficial for oil conduction.

[0047] The utility model also provides a pump body or a piston compressor, which may include any of the above-mentioned pistons 1. Among them, because the piston compressor adopts the above-mentioned piston 1, compared with the prior art, the utility model increases the oil return capacity of the piston 1 by adding an oil guide structure on the piston 1 to guide the oil in the oil groove 101 from the second end 12, thereby reducing the amount of lubricating oil discharged from the compressor, thereby ensuring the amount of oil inside the piston compressor.

[0048] The pump body is a piston compressor pump body, which includes a cylinder seat 3, a crankshaft, a connecting rod, a piston 1 and a cylinder head assembly. The piston 1 is the main moving part of the piston compressor. The piston 1 reciprocates in the cylinder bore 31 of the cylinder, and the piston 1 compresses the refrigerant gas in the cylinder bore 31 to generate cooling.

[0049] The present utility model further provides a refrigeration device, which includes a piston compressor, and the piston compressor includes the piston 1 described in any one of the above. Among them, due to the adoption of the piston 1 in the piston compressor of the refrigeration device, compared with the prior art, the present utility model realizes the improvement of the oil return ability of the piston 1 by adding an oil guiding structure on the piston 1 to lead the oil liquid in the oil sump 101 out from the second end 12, reduces the amount of lubricating oil discharged outside the compressor, and thus can ensure the amount of oil inside the piston compressor.

[0050] In some embodiments, the aforementioned refrigeration device may be a refrigerator, a freezer, or the like.

[0051] Among them, for the piston 1 of the present utility model, by designing an oil drain groove 102 on the second section 1b of the piston 1, the improvement of the oil return ability is realized, the amount of lubricating oil discharged outside the compressor is reduced, and this oil drain groove 102 communicates with the original oil sump 101 of the piston 1. Compared with a conventional piston, this design can drain the lubricating oil accumulated in the oil sump 101 during the movement process into the pump body, effectively reducing the amount of oil discharged into the system, ensuring the sufficiency of the lubricating oil amount for each friction pair, and increasing the reliability of the piston compressor. At the same time, the design of the oil drain groove 102 on the outer wall of the piston 1 can reduce the contact area between the piston 1 and the inner wall of the cylinder bore 31 while ensuring stable operation, reduce friction loss, and lower the exhaust temperature to a certain extent.

[0052] Those skilled in the art can easily understand that, on the premise of no conflict, the advantageous technical features of the above various embodiments can be freely combined and superimposed.

[0053] The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model. The above is only the preferred implementation manner of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present utility model, several improvements and modifications can still be made, and these improvements and modifications should also be regarded as within the protection scope of the present utility model.

Claims

1. A piston, the piston (1) having opposite first and second ends (11, 12), the first end (11) being the compression end, and an oil groove (101) being provided on the outer wall of the piston (1), the oil groove (101) being located between the first end (11) and the second end (12); characterized in that: A oil guiding structure is further provided on the piston (1), and the oil guiding structure is used to guide the oil in the oil groove (101) out from the second end (12).

2. The piston according to claim 1, characterized in that: The oil guiding structure includes an oil draining groove (102) provided on the outer wall of the piston (1), the oil draining groove (102) extending from the end face of the second end (12) to the oil groove (101) along the central axis direction of the piston (1), and the oil guiding structure guides the oil in the oil groove (101) out from the second end (12) through the oil draining groove (102).

3. The piston according to claim 2, characterized in that: The oil draining groove (102) is a flat groove.

4. The piston according to claim 2 or 3, characterized in that: The number of the oil draining grooves (102) is more than two, and they are evenly distributed around the central axis of the piston (1).

5. The piston according to any one of claims 1 - 3, characterized in that: The oil groove (101) is annular and is arranged around the central axis of the piston (1); the oil groove (101) divides the piston (1) into a first section (1a) and a second section (1b) along its central axis direction, the first section (1a) having the first end (11), and the second section (1b) having the second end (12); wherein, the oil guiding structure is provided on the second section (1b).

6. The piston according to claim 5, characterized in that: When the oil guiding structure includes an oil draining groove (102) provided on the outer wall of the piston (1), and the oil draining groove (102) is a flat groove, The first section (1a) is cylindrical, and the distance between the flat groove and the central axis of the piston (1) is less than the radius of the first section (1a); and / or, the second section (1b) is a prism structure, and each prism face of the prism structure forms one of the flat grooves.

7. The piston according to any one of claims 1 - 3, 6, characterized in that: In a cross-section coinciding with the central axis of the piston (1), the cross-sectional profile of the oil groove (101) is arc-shaped.

8. A pump body or piston compressor, characterized in that: It includes the piston (1) according to any one of claims 1 - 7.

9. A refrigeration device, characterized in that: It includes a piston compressor, and the piston compressor includes the piston (1) according to any one of claims 1 - 7.

10. The refrigeration device according to claim 9, characterized in that: The refrigeration device is a refrigerator or a freezer.

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