Reciprocating piston compressor, Refrigeration apparatus

Abstract

This invention provides a reciprocating piston compressor and a refrigeration device. The reciprocating piston compressor includes: a cylinder seat with a cylinder bore; a piston located within the cylinder bore and sliding reciprocally within the cylinder bore under the drive of a crankshaft; an annular groove is provided around the outer circumference of the cylinder bore within the cylinder seat; and an oil-pressing structure is constructed on the region of the cylinder seat adjacent to the cylinder bore. The oil-pressing structure can deliver a portion of the lubricating oil splashed during crankshaft rotation into the annular groove. This invention, through the oil-pressing structure, delivers a portion of the lubricating oil splashed during crankshaft rotation into the annular groove surrounding the outer circumferential wall of the cylinder bore. The lubricating oil entering the annular groove can reliably dissipate heat and cool the bore wall, thereby effectively reducing the temperature of the piston's outer wall.

Description

Technical Field

[0001] This invention belongs to the field of compressor design technology, specifically relating to a reciprocating piston compressor and refrigeration equipment. Background Technology

[0002] The piston compressor is the core component of a refrigerator's refrigeration system, and its performance and reliability directly determine the cooling effect. The piston compressor pump body mainly consists of a cylinder block, crankshaft, connecting rod, piston, and cylinder head assembly. During the intake phase, the temperature of the gas inside the cylinder has a significant impact on compressor performance; lower gas temperatures improve intake and exhaust efficiency and enhance compressor reliability. The cylinder block is made of gray cast iron, while the piston is made of powder metallurgy. During compressor operation, the piston reciprocates at high speed within the cylinder bore, resulting in extremely high temperatures on the piston's outer wall and the cylinder bore's inner wall. This high temperature can transfer to the inside of the cylinder bore, affecting the refrigerant and reducing compression efficiency. Therefore, proper cooling of the gas inside the cylinder is essential, as is reducing the piston and cylinder bore temperatures. Current technology relies solely on the splash cooling from the compressor crankshaft and crankshaft to the piston and cylinder bore, which is insufficient to meet the requirements. Summary of the Invention

[0003] Therefore, the present invention provides a reciprocating piston compressor and refrigeration equipment, which can solve the technical problem that in the prior art, the reciprocating piston compressor cools the piston only through splash cooling of the compressor crankshaft crank, resulting in limited cooling effect.

[0004] To address the above problems, the present invention provides a reciprocating piston compressor, comprising:

[0005] Cylinder seat, wherein the cylinder seat has a cylinder bore;

[0006] The piston is located within the cylinder bore and slides back and forth within the cylinder bore under the drive of the crankshaft;

[0007] The cylinder block has an annular groove around the outer circumference of the cylinder bore, and an oil-pressing structure is constructed on the area of ​​the cylinder block adjacent to the cylinder bore. The oil-pressing structure can deliver a portion of the lubricating oil splashed during the rotation of the crankshaft into the annular groove.

[0008] In some embodiments, the hydraulic pressurization structure includes:

[0009] The system includes an oil pressure hole, an oil outlet channel, and an oil pressure piston. The oil pressure piston is located inside the oil pressure hole and can slide back and forth with the piston. Splashed lubricating oil enters the oil pressure hole through the oil inlet hole and enters the annular groove through the oil outlet channel.

[0010] In some implementation methods

[0011] The piston and crank connecting rod are rotatably connected by a connecting pin, and the end of the connecting pin is positioned by a locating pin. The oil piston is connected to the locating pin by a connecting rod.

[0012] In some implementation methods

[0013] With reference to the orientation of the reciprocating piston compressor in its operating state, the connecting pin is vertically arranged, and the annular groove has an oil outlet located on the bore wall of the cylinder bore, corresponding to the top end of the connecting pin.

[0014] In some implementation methods

[0015] The thickness of the annular wall formed between the annular groove and the cylinder bore is 1 mm to 2 mm; and / or, the radial width of the annular groove is 0.5 mm to 2 mm.

[0016] In some implementation methods

[0017] The oil outlet channel has multiple channels, which are arranged at intervals along the depth direction of the oil pressure hole.

[0018] In some implementation methods

[0019] The cross-section of each oil outlet channel is circular, and the diameter of the circle is d2, where 1mm≤d2≤3mm.

[0020] In some implementation methods

[0021] The oil pressure hole is a blind hole, and the oil outlet channel closest to the bottom wall of the oil pressure hole has a straight-line distance from the orifice plane of the oil pressure hole that is greater than the stroke of the piston.

[0022] In some implementation methods

[0023] The opening of the oil inlet is along the axial direction of the cylinder bore and faces the side where the crankshaft is located. The diameter of the oil inlet is d1, where d1 ≥ 3 mm.

[0024] The present invention also provides a refrigeration device, including the above-described reciprocating piston compressor.

[0025] The reciprocating piston compressor and refrigeration equipment provided by this invention have the following beneficial effects:

[0026] The hydraulic pressurization structure directs a portion of the lubricating oil splashed during crankshaft rotation into an annular groove surrounding the outer circumferential wall of the cylinder bore. The lubricating oil entering the groove provides reliable cooling to the bore wall, effectively reducing the temperature of the piston's outer wall. It's understood that for reciprocating piston compressors, a portion of the crankshaft-driven splashed lubricating oil also enters the cylinder bore. This portion, along with the lubricating oil in the annular groove, provides more efficient cooling to the cylinder bore and piston, significantly improving compressor performance and operational reliability. More importantly, this hydraulic pressurization structure directly utilizes the lubricating oil splashed by the crankshaft rotation, achieving controllable guidance of the lubricating oil without the need for complex oil supply circuit design, resulting in a simpler structure.

[0027] The oil pressure piston can slide back and forth in the oil pressure hole following the reciprocating sliding of the piston. That is, the piston and the oil pressure piston form a driving linkage. There is no need to set up a corresponding driving component for the oil pressure piston separately. It can be driven by the crankshaft alone, which further simplifies the structure.

[0028] By utilizing the orientation characteristics of the positioning pin, a connection is formed between it and the oil pressure piston, thereby realizing the linkage between the reciprocating motion of the piston and the oil pressure piston.

[0029] By aligning the oil outlet of the annular groove with the top of the connecting pin, the lubricating oil in the annular groove can be further guided to the connection area between the piston and the connecting pin, ensuring sufficient lubrication in this area and thus achieving adequate lubrication of the moving parts in this area. The lubricating oil entering the cylinder bore through the oil outlet can also achieve adequate lubrication between the piston and the cylinder bore wall. Attached Figure Description

[0030] 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 introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0031] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0032] Figure 1This is a three-dimensional structural schematic diagram (partial cross-sectional view) of some components of the reciprocating piston compressor in an embodiment of the present invention;

[0033] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0034] Figure 3 for Figure 1 Another partial sectional view of the center view;

[0035] Figure 4 for Figure 3 The schematic diagram of the oil pressure piston is omitted.

[0036] Figure 5 for Figure 1 Cross-sectional view from a frontal perspective;

[0037] Figure 6 This is a partial cross-sectional view of the cylinder seat in an embodiment of the present invention.

[0038] The reference numerals in the attached figures are as follows:

[0039] 1. Cylinder seat; 11. Cylinder bore; 12. Annular groove; 121. Oil outlet; 21. Piston;

[0040] 22. Crankshaft; 23. Crankshaft connecting rod; 24. Connecting pin; 241. Locating pin; 31. Oil pressure hole; 32. Oil inlet hole; 33. Oil outlet channel; 34. Oil pressure piston; 341. Connecting rod. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] 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.

[0043] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] See also Figures 1 to 6 As shown, according to an embodiment of the present invention, a reciprocating piston compressor is provided, comprising:

[0049] Cylinder seat 1, wherein the cylinder seat 1 has a cylinder bore 11;

[0050] The piston 21 is located in the cylinder bore 11 and slides back and forth in the cylinder bore 11 under the drive of the crankshaft 22. It is understood that a crank connecting rod 23 is connected to the crankshaft 22, and the reciprocating sliding of the piston 21 is driven and controlled by the crank connecting rod 23.

[0051] The cylinder seat 1 is provided with an annular groove 12 around the outer circumference of the cylinder bore 11. An oil pressure structure (not indicated in the figure) is constructed on the area of ​​the cylinder seat 1 adjacent to the cylinder bore 11. The oil pressure structure can send a portion of the lubricating oil splashed during the rotation of the crankshaft 22 into the annular groove 12.

[0052] In this technical solution, a portion of the lubricating oil splashed during the rotation of the crankshaft 22 is fed into an annular groove 12 surrounding the outer circumferential wall of the cylinder bore 11 via an oil-pressing structure. The lubricating oil entering the annular groove 12 can reliably dissipate heat and cool the bore wall of the cylinder bore 11, thereby effectively reducing the temperature of the outer wall of the piston 21. It is understood that, for a reciprocating piston compressor, the lubricating oil splashed by the crankshaft 22 also enters the cylinder bore 11. This portion of lubricating oil, together with the lubricating oil in the annular groove 12, provides more efficient cooling for the cylinder bore 11 and the piston 21, significantly improving the performance and operational reliability of the compressor. More importantly, the oil-pressing structure in this technical solution directly utilizes the lubricating oil splashed by the rotation of the crankshaft 22, achieving controllable guidance of the lubricating oil without the need for a complex oil supply circuit design, resulting in a simpler structure.

[0053] In a specific embodiment, the oil pressing structure includes: an oil pressing hole 31, an oil outlet channel 33, and an oil pressing piston 34. The oil pressing piston 34 is located in the oil pressing hole 31 and can slide back and forth with the piston 21. The 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.

[0054] In this technical solution, the oil-pressing piston 34 can slide back and forth within the oil-pressing hole 31 following the reciprocating sliding of the piston 21. That is, the piston 21 and the oil-pressing piston 34 form a driving linkage, eliminating the need for separate corresponding drive components for the oil-pressing piston 34. It can be driven only by the crankshaft 22, further simplifying the structure. Specifically, when the piston 21 is at the top dead center of its stroke (i.e., when the compression chamber is venting), the oil-pressing piston 34 extends into the oil-pressing hole 31 and is close to the bottom wall of the hole, which can press the lubricating oil entering the oil-pressing hole 31 into the annular groove 12. When the piston 21 is at the bottom dead center of its stroke (i.e., when the compression chamber is drawing in air), the oil-pressing piston 34 is close to the opening of the oil-pressing hole 31. At this time, the lubricating oil entering the oil inlet hole 32 can flow into the space between the oil-pressing piston 34 and the bottom of the oil-pressing hole 31 within the oil-pressing hole 31, waiting to be pressed into the annular groove 12 by the oil-pressing piston 34. During the high-speed reciprocating motion of piston 21, the high-frequency circulation of lubricating oil enables the lubricating oil to enter the annular groove 12.

[0055] In one specific embodiment, see reference Figure 3 and Figure 4 As shown, the piston 21 and the crank connecting rod 23 are rotatably connected by a connecting pin 24, and the end of the connecting pin 24 is positioned by a locating pin 241. The main extension direction of the locating pin 241 is parallel to the reciprocating sliding direction of the piston 21. The hydraulic piston 34 is connected to the locating pin 241 by a connecting rod 341. Specifically, the connecting rod 341 of the hydraulic piston 34 and the free end of the locating pin 241 can be threaded, welded, or interference-fitted; theoretically, any method that can achieve a reliable connection between the two is acceptable. The aforementioned locating pin 241 can specifically be an elastic locating pin.

[0056] In this technical solution, by utilizing the orientation characteristics of the positioning pin 241, a connection is formed between it and the oil pressure piston 34, thereby realizing the linkage between the reciprocating motion of the piston 21 and the oil pressure piston 34.

[0057] It is understandable that, in order to ensure that the lubricating oil in the annular groove 12 is in a flowing state to improve its heat exchange cooling effect, the annular groove 12 has a corresponding oil outlet 121, so that the lubricating oil in the annular groove 12 can flow out in time. The aforementioned oil outlet 121 can generally be set on the outside of the cylinder seat, and the lubricating oil will flow back to the bottom oil sump of the compressor. In a preferred embodiment, with the orientation of the reciprocating piston compressor in the use state as a reference, the connecting pin 24 is set vertically, and the annular groove 12 has an oil outlet 121. The oil outlet 121 is located on the bore wall of the cylinder bore 11 and corresponds to the top position of the connecting pin 24.

[0058] In this technical solution, by setting the oil outlet 121 of the annular groove 12 to correspond to the top position of the connecting pin 24, the lubricating oil in the annular groove 12 can be further guided to the connection area between the piston 21 and the connecting pin 24, which can ensure sufficient lubrication in this area, thereby achieving sufficient lubrication of the moving pair in this area. At the same time, it can be understood that the lubricating oil entering the cylinder bore 11 through the oil outlet 121 can also achieve sufficient lubrication between the piston 21 and the cylinder bore 11 wall.

[0059] In some embodiments, the thickness of the annular wall formed between the annular groove 12 and the cylinder bore 11 is 1mm to 2mm, which ensures sufficient structural strength of the cylinder bore 11 wall while maintaining the cooling effect of the lubricating oil in the annular groove 12 on the cylinder bore 11 wall; and / or, the radial width of the annular groove 12 is 0.5mm to 2mm, that is, the gap width of the annular groove 12 is within the aforementioned range. In a preferred embodiment, the end face of the annular groove 12 near the crankshaft 22 is an open structure. In this way, during the rotation of the crankshaft 22, the lubricating oil is also splashed into the gap by the refrigerant oil thrown in through the aforementioned open structure, and the refrigerant oil in the gap will accumulate more and more, thereby further improving the cooling effect on the cylinder bore 11. It is understood that the aforementioned oil outlet channel 33 can ensure the amount of lubricating oil on the side of the annular groove 12 away from the crankshaft 22.

[0060] See details Figure 3 As shown, in some embodiments, there are multiple oil outlet channels 33, which are arranged sequentially at intervals along the depth direction of the oil pressure hole 31. The depth direction of the aforementioned oil pressure hole 31 is parallel to the depth direction of the cylinder bore 11. By setting multiple oil outlet channels 33 at intervals in the depth direction, it can be ensured that the lubricating oil in the oil pressure hole 31 can be pressed into the entire depth range of the annular groove 12 more quickly and efficiently, ensuring maximum cooling of the bore wall of the cylinder bore 11.

[0061] In a preferred embodiment, the oil pressure hole 31 is a blind hole, and the oil outlet channel 33 closest to the bottom wall of the oil pressure hole 31 has a straight-line distance from the orifice plane of the oil pressure hole 31 greater than the stroke of the piston 21, which can effectively prevent the lubricating oil from not being discharged. In a specific embodiment, the cross-section of each oil outlet channel 33 is circular, and the diameter of the circle is d2, where 1mm≤d2≤3mm.

[0062] The opening of the oil inlet hole 32 is along the axial direction of the cylinder bore 11 and faces the side where the crankshaft 22 is located. The diameter of the oil inlet hole 32 is d1, where d1 ≥ 3 mm, so as to ensure that the lubricating oil can enter the oil inlet hole 32 relatively smoothly under the action of the centrifugal force generated by the rotation of the crankshaft 22.

[0063] According to an embodiment of the present invention, a refrigeration device, such as a refrigerator, is also provided, including the reciprocating piston compressor described above.

[0064] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A reciprocating piston compressor, characterized in that include: Cylinder seat (1), the cylinder seat (1) having a cylinder bore (11); The piston (21) is located in the cylinder bore (11) and slides back and forth in the cylinder bore (11) under the drive of the crankshaft (22); The cylinder seat (1) is provided with an annular groove (12) around the outer circumference of the cylinder bore (11). An oil-pressing structure is constructed on the area of ​​the cylinder seat (1) adjacent to the cylinder bore (11). The oil-pressing structure can send a portion of the lubricating oil splashed during the rotation of the crankshaft (22) into the annular groove (12). The hydraulic pressurization structure includes: The oil pressure hole (31), the oil outlet channel (33), and the oil pressure piston (34) are located in the oil pressure hole (31) and can slide back and forth with the piston (21). The splashed lubricating oil enters the oil pressure hole (31) through the oil inlet hole (32) and enters the annular groove (12) through the oil outlet channel (33).

2. The reciprocating piston compressor according to claim 1, characterized in that, The piston (21) and the crank connecting rod (23) are rotatably connected by a connecting pin (24), and the end of the connecting pin (24) is positioned by a positioning pin (241). The oil piston (34) is connected to the positioning pin (241) by a connecting rod (341).

3. The reciprocating piston compressor according to claim 2, characterized in that, With reference to the orientation of the reciprocating piston compressor in use, the connecting pin (24) is vertically arranged, and the annular groove (12) has an oil outlet (121). The oil outlet (121) is located on the wall of the cylinder bore (11) and corresponds to the top position of the connecting pin (24).

4. The reciprocating piston compressor according to claim 1, characterized in that, The thickness of the annular wall formed between the annular groove (12) and the cylinder bore (11) is 1 mm to 2 mm; and / or, the radial width of the annular groove (12) is 0.5 mm to 2 mm.

5. The reciprocating piston compressor according to claim 1, characterized in that, The oil outlet channel (33) has multiple channels, and the multiple oil outlet channels (33) are arranged sequentially at intervals along the depth direction of the oil pressure hole (31).

6. The reciprocating piston compressor according to claim 5, characterized in that, The cross-section of each oil outlet channel (33) is circular, and the diameter of the circle is d2, 1mm≤d2≤3mm.

7. The reciprocating piston compressor according to claim 5, characterized in that, The oil pressure hole (31) is a blind hole, and the oil outlet channel (33) closest to the bottom wall of the oil pressure hole (31) has a straight distance from the orifice plane of the oil pressure hole (31) that is greater than the stroke of the piston (21).

8. The reciprocating piston compressor according to claim 1, characterized in that, The opening of the oil inlet (32) is along the axial direction of the cylinder bore (11) and faces the side where the crankshaft (22) is located. The diameter of the oil inlet (32) is d1, and d1≥3mm.

9. A refrigeration appliance characterized in that, The reciprocating piston compressor of any one of claims 1 to 8. The reciprocating piston compressor of any one of claims 1 to 8.

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