CN117514695A

CN117514695A - Reciprocating piston compressor and refrigeration equipment

Info

Publication number: CN117514695A
Application number: CN202311646629.9A
Authority: CN
Inventors: 杜金尧; 徐敏; 张霞; 邓聪聪
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2023-12-04
Filing date: 2023-12-04
Publication date: 2024-02-06

Abstract

The invention provides a reciprocating piston compressor and refrigeration equipment, wherein the reciprocating piston compressor comprises: the cylinder seat is provided with a cylinder hole; a piston which is positioned in the cylinder hole and slides back and forth in the cylinder hole under the drive of the crankshaft; the cylinder block is internally provided with a ring groove surrounding the outer circumference of the cylinder hole, a pressure oil structure is constructed on the area, adjacent to the cylinder hole, of the cylinder block, and the pressure oil structure can send part of lubricating oil splashed in the rotating process of the crankshaft into the ring groove. According to the invention, part of the lubricating oil splashed in the rotation process of the crankshaft is sent into the annular groove arranged around the outer circumferential wall of the cylinder hole through the oil pressing structure, and the lubricating oil entering the annular groove can reliably dissipate heat and cool the wall of the cylinder hole, so that the temperature of the outer wall of the piston can be effectively reduced.

Description

Reciprocating piston compressor and refrigeration equipment

Technical Field

The invention belongs to the technical field of compressor design, and particularly relates to a reciprocating piston compressor and refrigeration equipment.

Background

The piston compressor is a core component for refrigerating of the refrigerator, and the performance and reliability of the compressor directly determine the quality of the refrigerating effect. The piston compressor pump body mainly comprises a cylinder seat, a crankshaft, a connecting rod, a piston, a cylinder head assembly and the like, the temperature of gas in a cylinder has very important influence on the performance of the compressor in the air suction stage, and the lower the temperature of the gas in the cylinder is, the more favorable for improving the air suction and exhaust efficiency and the reliability of the compressor. The cylinder block is gray cast iron structure, and the piston is powder metallurgy structure, and the in-process of compressor operation, the piston is high-speed reciprocating motion in cylinder block cylinder bore, leads to the piston outer wall to be high with the cylinder bore inner wall temperature, can transmit the inside refrigerant that influences of cylinder bore, reduces compression efficiency. Therefore, proper cooling of the gas in the cylinder is necessary, the piston and cylinder bore temperature must be reduced, and the cooling of the piston is enhanced, whereas the prior art is insufficient to meet the requirements by cooling the piston cylinder bore only by splashing of the compressor crank shaft.

Disclosure of Invention

Therefore, the invention provides the reciprocating piston compressor and the refrigeration equipment, which can solve the technical problems that in the prior art, the cooling effect of the reciprocating piston compressor on the piston is limited only by splash cooling of a compressor crank.

In order to solve the above problems, the present invention provides a reciprocating piston compressor comprising:

the cylinder seat is provided with a cylinder hole;

a piston which is positioned in the cylinder hole and slides back and forth in the cylinder hole under the drive of the crankshaft;

the cylinder block is internally provided with a ring groove surrounding the outer circumference of the cylinder hole, a pressure oil structure is constructed on the area, adjacent to the cylinder hole, of the cylinder block, and the pressure oil structure can send part of lubricating oil splashed in the rotating process of the crankshaft into the ring groove.

In some embodiments, the pressure oil structure comprises:

the oil pressing piston is positioned in the oil pressing hole and can slide back and forth along with the piston, and splashed lubricating oil enters the oil pressing hole through the oil inlet hole and enters the annular groove through the oil outlet channel.

In some embodiments of the present invention in accordance with the present invention,

the piston is rotationally connected with the crank connecting rod through a connecting pin, the end part of the connecting pin is positioned through a positioning pin, and the pressure oil piston is connected with the positioning pin through a connecting rod.

the reciprocating piston compressor is characterized in that the connecting pin is vertically arranged by taking the direction of the reciprocating piston compressor in a use state as a reference, the annular groove is provided with an oil outlet, and the oil outlet is positioned on the wall of the cylinder hole and corresponds to the top end position of the connecting pin.

the thickness of the annular wall formed between the annular groove and the cylinder hole is 1 mm-2 mm; and/or the radial width of the ring groove is 0.5 mm-2 mm.

the oil outlet channels are multiple, and the multiple oil outlet channels are sequentially arranged at intervals along the Kong Shenfang direction of the pressure oil hole.

the cross section of each oil outlet channel is circular, and the diameter of the circular is d2, and d2 is more than or equal to 1mm and less than or equal to 3mm.

the oil pressing hole is a blind hole, and the straight line distance between the oil outlet channel closest to the bottom wall of the oil pressing hole and the orifice plane of the oil pressing hole is larger than the stroke of the piston.

the diameter of the oil inlet hole is d1, and d1 is more than or equal to 3mm along the axial direction of the cylinder hole and towards one side of the crankshaft.

The invention also provides refrigeration equipment comprising the reciprocating piston compressor.

The reciprocating piston compressor and the refrigeration equipment provided by the invention have the following beneficial effects:

part of the lubricating oil splashed in the rotating process of the crankshaft is sent into a ring groove arranged around the outer circumferential wall of a cylinder hole through a pressure oil structure, the lubricating oil entering the ring groove can reliably dissipate heat and cool the wall of the cylinder hole, and further the temperature of the outer wall of a piston can be effectively reduced, and as for a reciprocating piston compressor, the part of the lubricating oil splashed by the crankshaft, which enters the cylinder hole, forms more efficient cooling with the lubricating oil in the ring groove on the cylinder hole and the piston, and the performance and the operation reliability of the compressor can be remarkably improved; more importantly, the oil pressing structure in the technical scheme directly utilizes the lubricating oil splashed by the rotation drive of the crankshaft, can realize the controllable guiding of the lubricating oil without the design of a complicated oil supply way, and has simpler structure;

the oil pressing piston can slide back and forth in the oil pressing hole along with the reciprocating sliding of the piston, namely, driving linkage is formed between the piston and the oil pressing piston, the oil pressing piston is not required to be correspondingly provided with a driving component independently, and the structure is further simplified only through the driving of the crankshaft;

by utilizing the arrangement azimuth characteristics of the positioning pin, the positioning pin is connected with the oil pressing piston, so that the reciprocating motion of the piston and the linkage of the oil pressing piston are realized;

through the oil-out with the annular corresponds the top position setting with the connecting pin to can further guide the lubricating oil in the annular to the connection region of piston and connecting pin, can guarantee the abundant of this regional lubricating oil, and then realize the abundant lubrication to the kinematic pair in this region, lubricating oil can also realize abundant lubrication between piston and the cylinder pore wall body through the oil-out entering cylinder hole.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those skilled in the art from this disclosure that the drawings described below are merely exemplary and that other embodiments may be derived from the drawings provided without undue effort.

The structures, proportions, sizes, etc. shown in the present specification are shown only for the purposes of illustration and description, and are not intended to limit the scope of the invention, which is defined by the claims, so that any structural modifications, changes in proportions, or adjustments of sizes, which do not affect the efficacy or the achievement of the present invention, should fall within the ambit of the technical disclosure.

FIG. 1 is a schematic perspective view (partially cut away) of a portion of the components of a reciprocating piston compressor of an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is another partial cross-sectional view of the view of FIG. 1;

FIG. 4 is a schematic illustration of the pressure oil piston of FIG. 3 omitted;

FIG. 5 is a cross-sectional view from the front perspective of FIG. 1;

fig. 6 is a partial cross-sectional view of a cylinder block in an embodiment of the invention.

The reference numerals are expressed as:

1. a cylinder block; 11. a cylinder hole; 12. a ring groove; 121. an oil outlet; 21. a piston;

22. a crankshaft; 23. a crank connecting rod; 24. a connecting pin; 241. a positioning pin; 31. oil pressing holes; 32. an oil inlet hole; 33. an oil outlet channel; 34. a pressure oil piston; 341. and (5) connecting a rod.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.

Referring to fig. 1 to 6 in combination, there is provided a reciprocating piston compressor according to an embodiment of the present invention, including:

a cylinder block 1, wherein a cylinder hole 11 is formed in the cylinder block 1;

a piston 21 which is disposed in the cylinder bore 11 and is driven by the crankshaft 22 to reciprocate in the cylinder bore 11, and it is understood that a crank rod 23 is connected to the crankshaft 22, and drive control of reciprocating sliding of the piston 21 is achieved by the crank rod 23;

a ring groove 12 is provided in the cylinder block 1 around the outer circumference of the cylinder bore 11, and a pressing oil structure (not shown) is configured on a region of the cylinder block 1 adjacent to the cylinder bore 11, and the pressing oil structure is capable of feeding a part of lubricating oil splashed during rotation of the crankshaft 22 into the ring groove 12.

In this technical solution, part of the lubricating oil splashed during the rotation of the crankshaft 22 is sent into the ring groove 12 arranged around the outer circumferential wall of the cylinder hole 11 through the oil pressing structure, the lubricating oil entering the ring groove 12 can reliably dissipate heat and cool the wall of the cylinder hole 11, and further the temperature of the outer wall of the piston 21 can be effectively reduced, and it can be understood that, for the reciprocating piston compressor, the part of the lubricating oil splashed during the driving of the crankshaft 22 also enters the cylinder hole 11, and this part of the lubricating oil and the lubricating oil in the ring groove 12 form more efficient cooling for the cylinder hole 11 and the piston 21, so that the performance and the operation reliability of the compressor can be remarkably improved; more importantly, the oil pressing structure in the technical scheme directly utilizes the lubricating oil splashed by the rotation driving of the crankshaft 22, can realize the controllable guiding of the lubricating oil without the design of a complicated oil supply way, and has simpler structure.

In a specific embodiment, the pressing oil structure includes: the oil-pressing piston 34 is positioned in the oil-pressing hole 31 and can slide back and forth along with the piston 21, and splashed lubricating oil enters the oil-pressing hole 31 through the oil inlet hole 32 and enters the annular groove 12 through the oil outlet channel 33.

In this technical solution, the oil piston 34 can slide reciprocally in the oil hole 31 along with the reciprocal sliding of the piston 21, that is, the driving linkage is formed between the piston 21 and the oil piston 34, and the oil piston 34 does not need to be correspondingly provided with driving components alone, but only by driving the crankshaft 22, so that the structure is further simplified. Specifically, when the piston 21 is at the top dead center of the stroke (i.e., when the compression chamber is exhausting), the oil-pressing piston 34 extends into the oil-pressing hole 31 and is close to the bottom wall side of the hole, so that the oil that has entered into the oil-pressing hole 31 can be pressed into the ring groove 12, and when the piston 21 is at the bottom dead center of the stroke (i.e., when the compression chamber is sucking), the oil-pressing piston 34 is at the side close to the orifice of the oil-pressing hole 31, at this time, the oil that has entered into the oil-pressing hole 32 can flow into the space between the oil-pressing piston 34 in the oil-pressing hole 31 and the bottom of the oil-pressing hole 31, and waits for the pressed oil-pressing piston 34 to be pressed into the ring groove 12. During the high-speed reciprocation of the piston 21, the lubricant oil circulates at high frequency through the foregoing process to achieve the entry of the lubricant oil in the ring groove 12.

In a specific embodiment, as shown in fig. 3 and fig. 4, the piston 21 and the crank connecting rod 23 are rotatably connected by the connecting pin 24, the end of the connecting pin 24 is positioned by the positioning pin 241, the main body extending direction of the positioning pin 241 is parallel to the reciprocating sliding direction of the piston 21, the pressure oil piston 34 is connected with the positioning pin 241 by the connecting rod 341, specifically, both the connecting rod 341 of the pressure oil piston 34 and the free end of the positioning pin 241 can be screwed, welded or interference fit, and in theory, both the two can be reliably connected. The positioning pin 241 may be an elastic positioning pin.

In the technical scheme, the connection is formed between the positioning pin 241 and the pressure oil piston 34 by utilizing the setting azimuth characteristic of the positioning pin 241, so that the reciprocating motion of the piston 21 and the linkage of the pressure oil piston 34 are realized.

It will be appreciated that, in order to ensure that the lubricating oil in the ring groove 12 is in a flowing state to promote the heat exchange cold zone effect thereof, the ring groove 12 has an oil outlet 121 corresponding to the oil outlet 121, the lubricating oil in the ring groove 12 can flow out in time, the oil outlet 121 can be generally arranged at the outer side of the cylinder block, the lubricating oil will flow back to the bottom oil pool of the compressor, and in a preferred embodiment, the connecting pin 24 is vertically arranged with reference to the orientation of the reciprocating piston compressor in the use state, and the ring groove 12 has the oil outlet 121, and the oil outlet 121 is positioned on the wall of the cylinder hole 11 and corresponds to the top end position of the connecting pin 24.

In this technical scheme, through setting up the oil-out 121 of annular 12 and the top position correspondence of connecting pin 24 to can further guide the lubricating oil in the annular 12 to the connection region of piston 21 and connecting pin 24, can guarantee the abundant of this region lubricating oil, and then realize the abundant lubrication to the kinematic pair in this region, can understand simultaneously that lubricating oil passes through oil-out 121 and gets into in the jar hole 11 can also realize abundant lubrication to between piston 21 and the jar hole 11 wall body.

In some embodiments, the thickness of the annular wall formed between the annular groove 12 and the cylinder hole 11 is 1 mm-2 mm, so that the wall body of the cylinder hole 11 has enough structural strength, and the cooling effect of the lubricating oil in the annular groove 12 on the wall body of the cylinder hole 11 can be ensured; and/or the radial width of the ring groove 12 is 0.5 mm-2 mm, that is, the gap width of the ring groove 12 is in the above range, in a preferred embodiment, the end surface of the ring groove 12 near the crankshaft 22 is in an open structure, so that during the rotation of the crankshaft 22, the lubricating oil is also thrown in by the frozen oil through the open structure and is stored in the gap, and the more the frozen oil in the gap is stored, thereby further improving the cooling effect on the cylinder hole 11. At this time, it can be understood that the oil outlet passage 33 is provided to ensure the amount of lubrication oil on the side of the ring groove 12 away from the crankshaft 22.

Referring specifically to fig. 3, in some embodiments, the oil outlet channels 33 have a plurality of oil outlet channels 33, and the plurality of oil outlet channels 33 are sequentially spaced along the hole depth direction of the oil hole 31. The hole depth direction of the oil pressing hole 31 is parallel to the hole depth direction of the cylinder hole 11, and the oil pressing hole 31 can be ensured to be pressed into the whole groove depth range of the ring groove 12 more rapidly and efficiently by arranging a plurality of oil outlet channels 33 at intervals of Kong Shenfang upwards, so that the cooling of the wall of the cylinder hole 11 is ensured to be as large as possible.

In a preferred embodiment, the oil hole 31 is a blind hole, and the straight line distance between the oil outlet channel 33 closest to the bottom wall of the oil hole 31 and the plane of the orifice of the oil hole 31 is greater than the stroke of the piston 21, so that the situation that the lubricating oil cannot be discharged can be effectively avoided. In a specific embodiment, each of the oil outlet passages 33 has a circular cross section, and the diameter of the circular shape is d2, and d2 is 1 mm.ltoreq.d2.ltoreq.3mm.

The orifice of the oil inlet 32 is along the axial direction of the cylinder hole 11 and faces to the side where the crankshaft 22 is located, the diameter of the oil inlet 32 is d1, d1 is greater than or equal to 3mm, so that the oil can smoothly enter the oil inlet 32 under the action of the cost-reducing centrifugal force generated by the rotation of the crankshaft 22.

There is also provided, in accordance with an embodiment of the present invention, a refrigeration appliance, such as a refrigerator, including a reciprocating piston compressor as described above.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention. The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present invention, and these modifications and variations should also be regarded as the scope of the invention.

Claims

1. A reciprocating piston compressor, comprising:

a cylinder block (1), wherein a cylinder hole (11) is formed in the cylinder block (1);

a piston (21) which is located in the cylinder hole (11) and is driven by a crankshaft (22) to slide back and forth in the cylinder hole (11);

an annular groove (12) is formed in the cylinder seat (1) and surrounds the outer circumference of the cylinder hole (11), a pressure oil structure is formed in the area, adjacent to the cylinder hole (11), of the cylinder seat (1), and part of lubricating oil splashed in the rotating process of the crankshaft (22) can be sent into the annular groove (12) through the pressure oil structure.

2. The reciprocating piston compressor of claim 1 wherein said oil compressing structure comprises:

the oil pressing device comprises an oil pressing hole (31), an oil outlet channel (33) and an oil pressing piston (34), wherein the oil pressing piston (34) is positioned in the oil pressing hole (31) and can slide back and forth along with the piston (21), and splashed lubricating oil enters the oil pressing hole (31) through the oil inlet hole (32) and enters the annular groove (12) through the oil outlet channel (33).

3. The reciprocating piston compressor of claim 2, wherein,

the piston (21) is rotatably connected with the crank connecting rod (23) through a connecting pin (24), the end part of the connecting pin (24) is positioned through a positioning pin (241), and the pressure oil piston (34) is connected with the positioning pin (241) through a connecting rod (341).

4. The reciprocating piston compressor of claim 3, wherein,

with the orientation of the reciprocating piston compressor in a use state as a reference, the connecting pin (24) is vertically arranged, the annular groove (12) is provided with an oil outlet (121), and the oil outlet (121) is positioned on the wall of the cylinder hole (11) and corresponds to the top end position of the connecting pin (24).

5. The reciprocating piston compressor of claim 2, wherein,

the thickness of the annular wall formed between the annular groove (12) and the cylinder hole (11) is 1 mm-2 mm; and/or the radial width of the ring groove (12) is 0.5 mm-2 mm.

6. The reciprocating piston compressor of claim 2, wherein,

the oil outlet channels (33) are multiple, and the oil outlet channels (33) are sequentially arranged at intervals along the depth direction of the oil pressing hole (31).

7. The reciprocating piston compressor of claim 6, wherein,

the cross section of each oil outlet channel (33) is circular, and the diameter of the circular is d2, and d2 is more than or equal to 1mm and less than or equal to 3mm.

8. The reciprocating piston compressor of claim 6, wherein,

the oil pressing hole (31) is a blind hole, and the straight line distance between the oil outlet channel (33) closest to the bottom wall of the oil pressing hole (31) and the orifice plane of the oil pressing hole (31) is larger than the stroke of the piston (21).

9. The reciprocating piston compressor of claim 2, wherein,

the orifice of the oil inlet hole (32) is along the axial direction of the cylinder hole (11) and faces to the side where the crankshaft (22) is located, and the diameter of the oil inlet hole (32) is d1, wherein d1 is more than or equal to 3mm.

10. A refrigeration apparatus comprising a reciprocating piston compressor as claimed in any one of claims 1 to 9.