A bellows for an electronically controlled valve

Abstract

The object of the present invention is to provide a bellows for an electric control valve, which comprises an upper end cover, a bellows body, an internal spring and a lower end cover; characterized in that: the upper end cover and the lower end cover are respectively sleeved on the upper and lower ends of the bellows body, the internal spring connects the upper end cover and the lower end cover, and the bellows body is processed and formed with the same wall thickness to wave height ratio; the elasticity of the bellows is increased, which is beneficial to compensating the shrinkage ratio of the bellows, improving the compression ratio of the unit compression force, so as to improve the adjustment ability of the bellows and meet the utilization requirements under different environments.

Description

Technical Field

[0001] The invention relates to the field of bellows, in particular to an electric control valve bellows. Background Art

[0002] The electric control valve in the compressor of the air conditioner usually uses a bellows as a pressure-sensitive element. When the coil is energized, an electromagnetic force is generated, and the moving iron core is moved toward the static iron core by the magnetism. The bellows is compressed by the compression force, and the valve formed by the valve core and the body begins to adjust. The technical difficulty of the electric control valve lies in the stability and sensitivity of the vacuum bellows. The compression compensation of the bellows is too large, which causes the electric control valve to be unable to close when the V number specified by the electric control valve needs to be closed. The compression compensation of the bellows is too small, which causes the electric control valve to close too quickly, which is easy to change the shape of the bellows. In addition, the sensitivity of the bellows of the electric control valves currently on the market is low and is greatly affected by the environment. Summary of the invention

[0003] In view of the above-mentioned defects, the purpose of the present invention is to propose a bellows for an electric control valve, wherein grooves are dug on the outside of the upper and lower end covers, and a circular ring column is arranged inside, which cooperates with a built-in spring and is formed according to a specific wall thickness wave height ratio. The compression compensation amount of the bellows can be controlled within a reasonable range to meet the utilization requirements in different environments and allow the electric control valve to achieve a better compression compensation value working curve.

[0004] To achieve this object, the present invention adopts the following technical solution: a bellows for an electric control valve, comprising an upper end cover, a bellows body, a built-in spring and a lower end cover;

[0005] The upper end cover and the lower end cover are respectively sleeved on the upper and lower ends of the bellows, and the built-in spring connects the upper end cover and the lower end cover to increase the elasticity of the bellows, which is beneficial to compensate for the contraction ratio of the bellows and increase the compression ratio of the unit compression force to improve the adjustment ability of the bellows; the bellows body is processed and formed with the same wall thickness and wave height ratio, which can make the bellows more evenly stressed and expand the pressure range.

[0006] Preferably, the ratio of the wall thickness to the wave height of the bellows body is within the range of 0.047 to 0.17. A suitable wall thickness to wave height ratio can reduce the elastic stiffness of the bellows, expand the range of pressure that the bellows can withstand, and satisfy the single-wave axial elastic stiffness formula: The smaller the wall thickness, the higher the wave height, the smaller the stiffness and the smaller the equivalent stress, which increases the compression compensation of the bellows.

[0007] Preferably, the upper end cover and the lower end cover are respectively provided with an upper end cover protrusion and a lower end cover protrusion, which can limit the maximum range of bellows compression and prevent the bellows from deforming; the upper end cover protrusion and the lower end cover protrusion are cylinders, and the upper end cover protrusion and the lower end cover protrusion are placed inside the built-in spring ring, which can fix the direction of the built-in spring and prevent the direction of the built-in spring from changing due to the compression of the bellows. At the same time, the built-in spring supports the bellows, and the bellows is not easily distorted.

[0008] Preferably, the upper end cover groove is formed by recessing the central part of the bottom of the upper end cover. The upper end cover groove part has a clearance fit with the adjusting push rod assembly and contacts the vertical plane of the inner contour of the valve core to fix the bellows adjustment. The thrust is transmitted to the bellows through the adjusting push rod assembly; the lower end cover groove is formed by recessing the central part of the bottom of the lower end cover, providing a small hole with a clearance fit with the thimble moving iron core assembly. The outer part of the lower end cover is formed into an umbrella-shaped inclined surface, which can have a clearance fit with the valve core end cover. When the coil provides kinetic energy for the moving iron core, it compresses the bellows to play a conduction role.

[0009] Preferably, the depth of the upper end cover groove determines the adjustment ability of the upper end cover and the adjusting push rod assembly, and the depth of the lower end cover groove determines the adjustment ability of the lower end cover and the thimble moving iron core assembly;

[0010] For example, the depth of the upper end cover groove accounts for 20.8% - 23.1% of the total length of the bellows, and the depth of the lower end cover groove accounts for 14.6% - 16.2% of the total length of the bellows, which can improve the consistency of the electro-control valve and the adjustment accuracy of the electro-control valve.

[0011] Preferably, the bellows body is cut from a stainless steel plate to a suitable size, bent and processed according to parameters to form a corrugated plate, and then the corrugated plate is welded without trace.

[0012] For example, first cut the stainless steel plate to a suitable size, customize the bellows with specific parameters, reduce the size of the subsequent processing instrument, improve the work efficiency, bend and process according to parameters to form a corrugated plate, and the automated processing instrument ensures the accuracy of parameters such as the wave height of the bellows. Then weld the corrugated plate without trace to form the bellows body. The trace-free welding technology not only ensures the tightness of the bellows but also does not damage the stiffness of the bellows.

[0013] Preferably, one end of the built-in spring is welded to the inner bottom of the lower end cover, the bellows body is welded to the lower end cover, and the upper end cover is welded to the bellows body.

[0014] For example, first, one end of the built-in spring is welded to the inner bottom of the lower end cover. The lower end cover has a relatively long protrusion. Welding the built-in spring first can fix the position of the built-in spring. The bellows body is welded to the lower end cover, and assembling a part of the bellows facilitates subsequent assembly. The upper end cover is welded to the bellows body, enabling the built-in spring to connect the upper end cover and the lower end cover.

[0015] Preferably, the vacuum pump instrument evacuates air through the upper bellows body, evacuating the gas in the bellows to a vacuum state. When the bellows is in a vacuum state, the upper end cover and the upper end of the bellows body are quickly welded and sealed to ensure that a sealed vacuum state is formed inside the bellows.

[0016] The beneficial effects of the present invention: For the bellows for an electromagnetic control valve, the built-in spring connects the upper and lower end covers, increasing the elasticity of the bellows and compensating for the shrinkage ratio of the bellows. It is formed according to the wall thickness-wave height ratio within a set range, reducing the elastic stiffness of the bellows, expanding the force-bearing range of the bellows, improving the consistency of the electromagnetic control valve, and thus improving the adjustment accuracy of the electromagnetic control valve to meet the utilization requirements in different environments. Description of the Drawings

[0017] Figure 1 is a cross-sectional view of a bellows for an electromagnetic control valve in an embodiment structure of the present invention;

[0018] Figure 2 is an application installation diagram of a bellows for an electromagnetic control valve in an embodiment structure of the present invention;

[0019] Figure 3 is an application schematic diagram of a bellows for an electromagnetic control valve in an embodiment structure of the present invention.

[0020] Wherein: 1 bellows; 11 upper end cover; 111 upper end cover protrusion; 112 upper end cover groove; 12 bellows body; 13 built-in spring; 14 lower end cover; 141 lower end cover protrusion; 142 lower end cover groove 142; 2 adjusting push rod assembly; 3 valve core; 4 valve core end cover; 5 thimble moving iron core assembly. Detailed Description of the Embodiment

[0021] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] Combine the following Figures 1 to 3 , describing a bellows for an electric control valve according to an embodiment of the present invention, comprising an upper end cover 11, a bellows body 12, a built-in spring 13 and a lower end cover 14;

[0024] The upper end cover 11 and the lower end cover 14 are respectively sleeved on the upper and lower ends of the bellows 1, and the built-in spring 13 connects the upper end cover 11 and the lower end cover 14, thereby increasing the elasticity of the bellows, which is beneficial to compensating the contraction ratio of the bellows and increasing the compression ratio of the unit compression force, so as to improve the adjustment ability of the bellows; the bellows body 12 is formed by processing with the same wall thickness wave height ratio, so that the bellows can be subjected to more uniform force and expand the pressure range.

[0025] It is worth noting that the number of rings of the built-in spring 13 can be adjusted according to actual applications.

[0026] Preferably, the ratio of the wall thickness to the wave height of the bellows body 12 is in the range of 0.047 to 0.17. A suitable wall thickness to wave height ratio can reduce the elastic stiffness of the bellows, expand the range of pressure that the bellows can withstand, and satisfy the single-wave axial elastic stiffness formula: The smaller the wall thickness, the higher the wave height, the smaller the stiffness and the smaller the equivalent stress, which increases the compression compensation of the bellows.

[0027] Preferably, the upper end cover 11 and the lower end cover 12 are respectively provided with an upper end cover protrusion 111 and a lower end cover protrusion 141, which can limit the maximum range of compression of the bellows and avoid deformation of the bellows; the upper end cover protrusion 111 and the lower end cover protrusion 141 are cylinders, and the upper end cover protrusion 111 and the lower end cover protrusion 141 are placed in the ring of the built-in spring 13, which can fix the direction of the built-in spring 13 and avoid the direction of the built-in spring 13 changing due to the compression of the bellows. At the same time, the built-in spring 13 supports the bellows 1, and the bellows 1 is not easily twisted and deformed.

[0028] In some embodiments, such as Figures 2-3As shown, the upper end cap groove 112 is formed by the depression of the central part at the bottom of the upper end cap 11. The grooved part of the upper end cap 11 is in clearance fit with the adjusting push rod assembly 2 and is in vertical contact with the inner contour surface of the valve core 3 to fix the bellows adjustment. The adjusting push rod assembly 2 transmits thrust to the bellows; the lower end cap groove 142 is formed by the depression of the central part at the bottom of the lower end cap 14, providing a small hole in clearance fit with the thimble moving iron core assembly 5. The outer part of the lower end cap 14 is formed into an umbrella-shaped inclined surface and can be in clearance fit with the valve core end cap 4, and when the coil provides kinetic energy for the moving iron core, it compresses the bellows to play a conduction role.

[0029] Preferably, the depth of the upper end cap groove 112 determines the adjustment ability of the upper end cap 11 and the adjusting push rod assembly 2, and the depth of the lower end cap groove 142 determines the adjustment ability of the lower end cap 14 and the thimble moving iron core assembly 5;

[0030] For example, the depth of the upper end cap groove 112 accounts for 20.8% - 23.1% of the total length of the bellows 1, and the depth of the lower end cap groove 142 accounts for 14.6% - 16.2% of the total length of the bellows 1, which can improve the consistency of the electric control valve and the adjustment accuracy of the electric control valve.

[0031] Preferably, the bellows body 12 is cut from a stainless steel sheet to a suitable size, bent and processed according to parameters to form a corrugated plate, and then the corrugated plate is welded without traces.

[0032] For example, first cut the stainless steel sheet to a suitable size, customize the bellows for specific parameters, reduce the size of subsequent processing instruments, improve work efficiency, bend and process according to parameters to form a corrugated plate, and the automated processing instrument ensures the accuracy of parameters such as the wave height of the bellows. Then weld the corrugated plate without traces to form the bellows body 12. The trace-free welding technology not only ensures the airtightness of the bellows but also does not damage the stiffness of the bellows.

[0033] Preferably, one end of the built-in spring 13 is welded and connected to the inner bottom of the lower end cap 14, the bellows body 12 is welded and connected to the lower end cap 14, and the upper end cap 11 is welded and connected to the bellows body 12.

[0034] For example, first weld one end of the built-in spring 13 to the inner bottom of the lower end cap 14. The lower end cap protrusion 141 is relatively long, and welding the built-in spring 13 first can fix the position of the built-in spring 13; weld the bellows body 12 to the lower end cap 14 to facilitate the subsequent assembly of a part of the bellows; weld the upper end cap 11 to the bellows body 12 to realize the connection of the built-in spring 13 between the upper end cap 11 and the lower end cap 12.

[0035] Preferably, the vacuum pump instrument evacuates air through the upper bellows body, evacuating the gas in the bellows 1 to a vacuum state. When the bellows 1 is in a vacuum state, the upper end cover 11 and the upper end of the bellows body 12 are quickly welded and sealed to ensure that a sealed vacuum state is formed inside the bellows 1.

[0036] The technical principle of the present invention has been described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be construed in any way as a limitation on the protection scope of the present invention. Based on the explanations herein, those skilled in the art can readily conceive of other specific embodiments of the present invention without creative efforts, and these embodiments will fall within the protection scope of the present invention.

Claims

1. A bellows for an electronically controlled valve, characterized in that: It includes an upper end cover, a corrugated pipe body, a built-in spring and a lower end cover. The upper end cover and the lower end cover are respectively sleeved on the upper and lower ends of the corrugated pipe body, and the built-in spring connects the upper end cover and the lower end cover; The corrugated pipe body is processed and formed with the same wall thickness to wave height ratio, and the ratio of the wall thickness to the wave height is 0.047 - 0.17; The upper end cover and the lower end cover are respectively provided with cylindrical protrusions, and the protrusions are embedded in the built-in spring ring to fix the spring direction; The corrugated pipe body is connected with the upper and lower end covers by seamless welding, and a sealed vacuum chamber is formed by vacuum pumping before welding.

2. The bellows for an electric control valve according to claim 1, characterized in that: The protrusions of the upper end cover and the protrusions of the lower end cover are cylinders.

3. The bellows for an electric control valve according to claim 2, characterized in that: The upper end cover groove and the lower end cover groove are respectively formed by the central parts of the bottoms of the upper end cover and the lower end cover being recessed; the outer part of the lower end cover is formed into an umbrella-shaped inclined surface.

4. A bellows for an electric control valve according to claim 3, characterized in that: The depth of the upper end cover groove accounts for 20.8% - 23.1% of the total length of the corrugated pipe; the depth of the lower end cover groove accounts for 14.6% - 16.2% of the total length of the corrugated pipe.

5. A bellows for an electric control valve according to claim 1, characterized in that: The corrugated pipe body is cut from a stainless steel plate to a suitable size, bent according to parameters to form a corrugated plate, and then the corrugated plate is bent and seamlessly welded.

6. The bellows for an electromagnetic control valve according to claim 1, wherein: One end of the built-in spring is welded and connected to the inner bottom of the lower end cover, the corrugated pipe body is welded and connected to the lower end cover, and the upper end cover is welded and connected to the corrugated pipe body.

7. A bellows for an electric control valve according to claim 6, characterized in that: The vacuum pump instrument pumps air through the upper corrugated pipe body, and then the upper end cover and the upper end of the corrugated pipe body are welded and sealed.

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