CN108343594B - Opposed linear compressor end cover and design method thereof - Google Patents
Opposed linear compressor end cover and design method thereof Download PDFInfo
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- CN108343594B CN108343594B CN201810449932.2A CN201810449932A CN108343594B CN 108343594 B CN108343594 B CN 108343594B CN 201810449932 A CN201810449932 A CN 201810449932A CN 108343594 B CN108343594 B CN 108343594B
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- end cover
- central
- cambered surface
- compressor
- outer diameter
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/121—Casings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0027—Pulsation and noise damping means
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Compressor (AREA)
Abstract
The invention relates to the technical field of linear compressors, in particular to an opposite type linear compressor end cover and a design method thereof. The end cover of the opposed linear compressor is a revolution body and comprises an outer surface, an inner surface and an outer diameter circle, wherein the outer surface and the inner surface are sequentially arranged from top to bottom, and the outer diameter circle is connected between the outer surface and the inner surface. The inner surface comprises a central cambered surface and a connecting surface which are sequentially arranged from inside to outside. The central cambered surface is an arc surface or an elliptical cambered surface. According to the invention, the inner surface of the end cover of the opposite linear compressor is designed, so that the vibration of the end surface of the compressor is obviously reduced on the premise of not increasing the volume and the weight of the compressor and meeting the external dimension, the adverse effect caused by the vibration of the end surface of the compressor is effectively eliminated, meanwhile, the stress of a welding line is more uniform, and the maximum concentrated stress is obviously reduced.
Description
Technical Field
The invention relates to the technical field of linear compressors, in particular to an opposite type linear compressor end cover and a design method thereof.
Background
The Stirling refrigerator is mainly used for cooling an infrared chip, and the linear compressor is an important component of the Stirling refrigerator. The Stirling refrigerator can vibrate during operation, and the normal operation of the infrared chip can be seriously influenced by the vibration, so that the vibration of the Stirling refrigerator needs to be reduced, and the normal operation of the infrared chip is ensured. In general, an opposed linear compressor is a compressor in which a compression space for sucking and discharging an operating gas is formed between a piston and a cylinder, so that the piston reciprocates linearly inside the cylinder and compresses a working fluid gas. The structure of the opposite linear compressors is that the two linear compressors are symmetrically arranged, the piston motion in each compressor is linear reciprocating motion, the phase angles of the piston motions of the two linear compressors are theoretically 180 degrees different, and the symmetrical structure can effectively reduce the vibration of the compressors.
At present, the inner surface of the end cover of the linear compressor part of the Stirling refrigerator is of a planar structure, and through practical application verification, the end cover of the planar structure still has larger vibration on the surface of the end cover of the compressor, and the vibration distribution is uneven. The vibration is characterized in that the vibration of the center of the end cover is large, and the vibration of the edge of the end cover is small. This vibration cannot be eliminated by the symmetrical arrangement of the compressors, and some compressors currently reduce the vibration by increasing the thickness of the end cover, but increasing the thickness increases the weight and volume of the compressor, which affects practical applications. On the other hand, the end cover of the compressor is welded on the compressor, and uneven stress of the end cover can be caused due to uneven vibration distribution, so that stress of a welding line is influenced, and the reliability of the welding line is influenced.
Disclosure of Invention
The invention aims to provide an end cover of an opposite linear compressor and a design method thereof, which can solve the defects in the prior art, greatly reduce the vibration stress condition of the end surface of the compressor on the premise of not increasing the volume and the weight of the compressor, and effectively avoid the adverse effect on the reliability of welding seams.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
an end cover of an opposite linear compressor is a revolving body and comprises an outer surface, an inner surface and an outer diameter circle, wherein the outer surface and the inner surface are sequentially arranged from top to bottom; the inner surface comprises a central cambered surface and a connecting surface which are sequentially arranged from inside to outside; the central cambered surface is an arc surface or an elliptical cambered surface.
Further, the outer surface is a plane or an arc surface.
Further, the connecting surface is any one of a conical surface, an arc surface or an elliptic arc surface.
Further, a connecting part of the end cover and the compressor is arranged between the inner periphery of the outer diameter circle and the outer periphery of the inner surface; the end cap is welded or screwed to the compressor.
The invention also relates to a design method of the end cover of the opposite linear compressor, which comprises the following steps:
(1) Determining the center point of the center cambered surface: the center point of the center cambered surface is positioned on the inner surface side of the end cover and is positioned on the center line of the end cover; if the central cambered surface is an arc surface, the radius of the arc surface is more than or equal to one quarter of the diameter of the outer diameter circle; if the central cambered surface is an elliptical cambered surface, the distance from the central point of the elliptical cambered surface to the arc top of the central cambered surface is more than or equal to one quarter of the diameter of the outer diameter circle.
(2) Determining a central cambered surface according to the central point of the central cambered surface: the angle A formed by the central cambered surface and the central point of the central cambered surface is more than or equal to one third of the angle B formed by the outer diameter circle and the central point of the central cambered surface.
(3) The method comprises the steps of firstly determining the size of an angle A formed by a central cambered surface and a central point of the central cambered surface, then determining the structure of a connecting surface according to the diameter of an outer diameter circle and the connection mode of the end cover and the compressor, and connecting the outer surface, the outer diameter circle, the connecting surface and the central cambered surface to form a whole on the surface of the end cover.
Further, when = a = B, the area of the connection surface is 0. Namely, the inner surface of the end cover has no connecting surface, and the whole body is a central cambered surface.
According to the technical scheme, the inner surface of the end cover of the opposite linear compressor is designed, so that the vibration of the end face of the compressor is obviously reduced on the premise that the size and the weight of the compressor are not increased and the overall dimension is met, the adverse effect caused by the vibration of the end face of the compressor is effectively eliminated, meanwhile, the stress of a welding line is more uniform, and the maximum concentrated stress is obviously reduced.
Drawings
FIG. 1 is a schematic view of an opposed linear compressor end cover of the present invention;
fig. 2 is a schematic view of an end cover of an opposed linear compressor in accordance with an embodiment.
Wherein:
1. the outer surface, 2, the intersection line of central cambered surface and joint surface, 3, the joint surface, 4, central cambered surface, 5, the central point of central cambered surface, 6, the connecting portion of end cover and compressor, 7, external diameter circle, 8, welding step, 9, the arc surface.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
an opposed linear compressor end cover as shown in fig. 1 is a revolution body including an outer surface 1 and an inner surface disposed in this order from top to bottom and an outer diameter circle 7 connected between the outer circumference of the outer surface 1 and the outer circumference of the inner surface. The inner surface is a combined surface formed by splicing a central cambered surface 4 and a connecting surface 3 which are sequentially arranged from inside to outside. Inside the intersection line 2 of the central cambered surface and the connecting surface in fig. 1 is a central cambered surface 4 and outside is a connecting surface 3. The central cambered surface 4 is an arc surface or an elliptical cambered surface.
Further, the form of the outer surface is not limited, and preferably, the outer surface is a plane or an arc surface.
Further, the connecting surface is any one of a conical surface, an arc surface or an elliptic arc surface.
Further, a connecting portion 6 between the end cover and the compressor is provided between the inner periphery of the outer diameter circle 7 and the outer periphery of the inner surface. The end cap is welded or screwed to the compressor.
The invention also relates to a design method of the end cover of the opposite linear compressor, which comprises the following steps:
(1) Determining a center point 5 of the center cambered surface: the center point 5 of the center cambered surface is positioned on the inner surface side of the end cover and is positioned on the center line of the end cover; if the central cambered surface 4 is an arc surface, the radius of the arc surface is more than or equal to one fourth of the diameter of the outer diameter circle 7; if the central cambered surface 4 is an elliptical cambered surface, the distance D from the central point of the elliptical cambered surface to the arc top of the central cambered surface is more than or equal to one fourth of the diameter D of the outer diameter circle 7, namely D is more than or equal to 0.25D.
(2) Determining a central cambered surface according to the central point of the central cambered surface: the angle A formed by the center cambered surface and the center point of the center cambered surface is more than or equal to one third of the angle B formed by the outer diameter circle and the center point of the center cambered surface (namely, the angle A is more than or equal to 1/3 of the angle B).
(3) The method comprises the steps of firstly determining the size of an angle A formed by a central cambered surface and a central point of the central cambered surface, then determining the structure of a connecting surface according to the diameter of an outer diameter circle and the connection mode of the end cover and the compressor, and connecting the outer surface, the outer diameter circle, the connecting surface and the central cambered surface to form a whole on the surface of the end cover. The size and form of the connection surface and the connection portion of the end cover and the compressor can be properly selected, so long as the surface of the end cover is ensured to form a whole. When = -a = -B, the area of the connection surface is 0; namely, the inner surface of the end cover has no connecting surface, and the whole body is a central cambered surface.
Example 1
As shown in fig. 2, in this embodiment, the diameter D of the outer diameter circle 7 is 96mm, the outer surface 1 is a plane, the connection portion of the end cover and the compressor adopts a mode of reserving a welding step 8, the central cambered surface adopts an arc surface 9, the radius of the arc surface 9 is 68.6mm, the center point 5 of the central cambered surface is located on the inner surface side of the center line of the end cover, the angle formed by the arc surface 9 and the center point 5 of the central cambered surface is 78 °, the angle formed by the outer diameter circle 7 and the center point 5 of the central cambered surface is 84 °, the central cambered surface is directly connected with the reserved welding step 8, and in this example, there is no connection surface 3.
The design principle of the invention is as follows:
when the Stirling refrigerator works, working medium gas in the compressor is continuously compressed and expanded, the force directly acts on the inner surface of the end cover of the compressor, and when the inner surface is a plane, the stress direction of the force is all along the axial direction of the end cover, so that the stress on the inner surface of the end cover of the compressor is maximized. When the gas expands, the inner surface of the end cover is subjected to outward expansion force, so that the central part of the end cover is raised, and when the gas is compressed, the central part of the end cover is inwards concave. Because the working medium gas is continuously compressed and expanded, the end cover is continuously protruded and concaved inwards to form a vibration effect, so that larger vibration is formed on the surface of the end cover. When the inner surface is changed into the cambered surface structure, the stress direction of the inner surface of the end cover is changed to be the normal direction along each cambered surface point, so that the axial force is reduced, the vibration effect is reduced, and the vibration of the end cover is reduced.
In addition, when the welding structure is adopted at multiple parts of the whole structure of the compressor or the welding mode is adopted for the connection mode of the end cover of the compressor and the compressor, the stress condition of welding seams of relevant parts can be improved by reducing the stress vibration of the end cover, so that the adverse effect on the welding seams is reduced.
According to practical application verification, when the cambered surface structure of the inner surface is reasonable, the vibration of the end face of the compressor can be reduced by more than one order of magnitude.
The above examples are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (3)
1. An opposed linear compressor end cap, characterized by: the end cover is a revolving body and comprises an outer surface and an inner surface which are sequentially arranged from top to bottom, and an outer diameter circle connected between the outer surface and the inner surface; the inner surface comprises a central cambered surface and a connecting surface which are sequentially arranged from inside to outside; the central cambered surface is an arc surface or an elliptical cambered surface; the connecting surface is any one of a conical surface, an arc surface or an elliptical arc surface;
the design method of the end cover comprises the following steps:
(1) Determining the center point of the center cambered surface: the center point of the center cambered surface is positioned on the inner surface side of the end cover and is positioned on the center line of the end cover; if the central cambered surface is an arc surface, the radius of the arc surface is more than or equal to one quarter of the diameter of the outer diameter circle; if the central cambered surface is an elliptical cambered surface, the distance from the central point of the elliptical cambered surface to the arc top of the central cambered surface is more than or equal to one quarter of the diameter of the outer diameter circle;
(2) Determining a central cambered surface according to the central point of the central cambered surface: an angle A formed by the central cambered surface and the central point of the central cambered surface is more than or equal to one third of an angle B formed by the outer diameter circle and the central point of the central cambered surface;
(3) The method comprises the steps of firstly determining the size of an angle A formed by a central cambered surface and a central point of the central cambered surface, then determining the structure of a connecting surface according to the diameter of an outer diameter circle and the connection mode of the end cover and the compressor, and connecting the outer surface, the outer diameter circle, the connecting surface and the central cambered surface to form a whole on the surface of the end cover.
2. The opposed linear compressor end cover of claim 1, wherein: the outer surface is a plane or an arc surface.
3. The opposed linear compressor end cover of claim 1, wherein: a connecting part of the end cover and the compressor is arranged between the inner periphery of the outer diameter circle and the outer periphery of the inner surface; the end cap is welded or screwed to the compressor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810449932.2A CN108343594B (en) | 2018-05-11 | 2018-05-11 | Opposed linear compressor end cover and design method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810449932.2A CN108343594B (en) | 2018-05-11 | 2018-05-11 | Opposed linear compressor end cover and design method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108343594A CN108343594A (en) | 2018-07-31 |
| CN108343594B true CN108343594B (en) | 2023-10-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810449932.2A Active CN108343594B (en) | 2018-05-11 | 2018-05-11 | Opposed linear compressor end cover and design method thereof |
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| Country | Link |
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| CN (1) | CN108343594B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09113053A (en) * | 1995-10-19 | 1997-05-02 | Sanyo Electric Co Ltd | Stirling refrigerator |
| CN101191472A (en) * | 2007-12-27 | 2008-06-04 | 宁波亿盛电机有限公司 | Linear compressor |
| WO2008108460A1 (en) * | 2007-03-08 | 2008-09-12 | Sharp Kabushiki Kaisha | Regenerator for stirling engine and stirling engine using same |
| CN208564911U (en) * | 2018-05-11 | 2019-03-01 | 中国电子科技集团公司第十六研究所 | A kind of opposed type Linearkompressor end cap |
-
2018
- 2018-05-11 CN CN201810449932.2A patent/CN108343594B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09113053A (en) * | 1995-10-19 | 1997-05-02 | Sanyo Electric Co Ltd | Stirling refrigerator |
| WO2008108460A1 (en) * | 2007-03-08 | 2008-09-12 | Sharp Kabushiki Kaisha | Regenerator for stirling engine and stirling engine using same |
| CN101191472A (en) * | 2007-12-27 | 2008-06-04 | 宁波亿盛电机有限公司 | Linear compressor |
| CN208564911U (en) * | 2018-05-11 | 2019-03-01 | 中国电子科技集团公司第十六研究所 | A kind of opposed type Linearkompressor end cap |
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| Publication number | Publication date |
|---|---|
| CN108343594A (en) | 2018-07-31 |
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