CN220751432U - Be applied to pressure sensor's super gentle bellows and pressure sensor - Google Patents
Be applied to pressure sensor's super gentle bellows and pressure sensor Download PDFInfo
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- CN220751432U CN220751432U CN202322285037.0U CN202322285037U CN220751432U CN 220751432 U CN220751432 U CN 220751432U CN 202322285037 U CN202322285037 U CN 202322285037U CN 220751432 U CN220751432 U CN 220751432U
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- 239000010935 stainless steel Substances 0.000 claims description 3
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- 238000003466 welding Methods 0.000 description 8
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- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 229910000619 316 stainless steel Inorganic materials 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
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- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model discloses an ultra-flexible corrugated pipe applied to a pressure sensor and the pressure sensor, wherein the ultra-flexible corrugated pipe comprises a pressure transmission unit and a deformation unit, the pressure transmission unit is provided with an input port and an output port which are communicated with each other, the deformation unit is a hollow pipe body which can be expanded and deformed under the action of force, one end of the deformation unit is an open end, and the other end of the deformation unit is a sealing end; the opening end of the deformation unit is communicated with the output port of the pressure transmission unit; the deformation unit is a multi-wave corrugated pipe, the cross section of the pipe wall along the axial direction is wavy, and the wall thickness of the pipe wall is 0.5-1 mm. The multi-wave corrugated pipe has larger flexibility, and can effectively improve the resolution and the sensitivity of the pressure sensor, so as to be suitable for large-displacement application of the low-pressure sensor.
Description
Technical Field
The utility model relates to the technical field of pressure sensors and metal corrugated pipes, in particular to an ultra-flexible corrugated pipe applied to a pressure sensor and the pressure sensor.
Background
The bellows is an elastic element that is axially stretchable in the folding direction, and the metal bellows has displacement compensation capability in the form of axial stretching, bending deformation and combinations thereof, typically a thin-walled tube shell member with transverse corrugations. The metal corrugated pipe is generally composed of a plurality of waveforms and accessory connecting elements thereof, has good displacement compensation capability, and is excellent in structural strength and fatigue resistance. The metal bellows gradually becomes an indispensable component in displacement compensation, noise reduction and vibration reduction, sealing, valves and pipeline connection, and is widely applied to a plurality of fields such as automatic control, instruments and meters, vacuum technology, mechanical industry, aerospace, nuclear industry and the like. The metal corrugated pipe is mainly applied to the fields of elastic sensitive elements, sealing, displacement compensation and the like in the mechanical field. In the elastic sensing element, the signal acquisition is realized mainly by the sensitivity of the corrugated pipe to the internal pressure.
In the sealing element, the axial sealing end face is pressurized through the metal corrugated pipe, so that the sealing performance of the structure is maintained, and the corrugated pipe has the advantages of simple structure, strong applicability, high fatigue life and the like; in the displacement compensation element, the displacement compensation caused by deviation in the installation of pipelines or other equipment is mainly realized by using the corrugated pipe, and when the displacement compensation element is applied to a pressure sensor, the opening end of the corrugated pipe is fixed, and the sealing end is in a free state, so that the pressure is converted into displacement or force. When the corrugated pipe is in operation, the corrugated pipe is stretched or compressed along the coaxial length direction under the action of internal pressure, so that the movable end generates displacement which has a certain functional relation with the pressure, but the displacement generated by the movable end at low pressure is difficult to maintain a linear relation with the pressure, the sensitivity is reduced, and the low-pressure sensor adopting the corrugated pipe as a transmission structure has high requirement on displacement change, and generally, larger displacement and precision are required to be generated at low pressure. The corrugated pipe applied to the pressure sensor in the prior art is mostly single-wave, and the pipe wall is thick, so that the displacement change generated in the low-pressure measuring environment is not obvious, and the measurement under the low-pressure high-precision condition is difficult.
Therefore, how to design a bellows with small bearing pressure, large displacement and suitability for low-pressure measurement environment, and make the manufactured pressure sensor have the advantages of high sensitivity in a range, good linearity, suitability for low-pressure induction and high working stability, and is a technical problem which is solved by the technicians in the field.
Disclosure of Invention
Aiming at the technical problems existing in the prior art, the utility model provides an ultra-flexible corrugated pipe applied to a pressure sensor and the pressure sensor, which are suitable for being used in a low-pressure measuring environment.
The technical scheme adopted for solving the technical problems is as follows: the ultra-flexible corrugated pipe comprises a pressure transmission unit and a deformation unit, wherein the pressure transmission unit is provided with an input port and an output port which are communicated with each other, the deformation unit is a hollow pipe body which can be expanded and deformed under stress, one end of the deformation unit is an open end, and the other end of the deformation unit is a sealed end; the opening end of the deformation unit is communicated with the output port of the pressure transmission unit; the deformation unit is a multi-wave corrugated pipe, the cross section of the pipe wall along the axial direction is wavy, and the wall thickness of the pipe wall is 0.5-1 mm.
Further, the wavy waveform is U-shaped.
Further, a transmission channel is arranged in the pressure transmission unit, and the input port is communicated with the output port through the transmission channel; the diameter of the cross section of the transmission channel is 1.2-1.8 mm.
Further, the device also comprises a displacement unit, wherein the other end of the deformation unit is fixedly connected with the displacement unit to form the sealing end.
Further, the displacement unit, the transmission channel and the deformation unit are located on the same axis.
Further, the outer wall surface of the pressure transmission unit is provided with a limiting boss, and an external thread is arranged on the part, between the limiting boss and the input port, of the outer wall surface of the pressure transmission unit and is fixedly connected with an external pressure source through the external thread.
Further, the deformation unit is made of stainless steel.
The utility model further provides a pressure sensor, which comprises the super-flexible corrugated pipe applied to the pressure sensor.
Further, the piezoelectric resonator comprises a shell and a piezoelectric resonator element, wherein the sealing end of the deformation unit is connected with the piezoelectric resonator element and is arranged in the shell, and the piezoelectric resonator element can generate corresponding electric signal output according to the moving size and direction of the deformation unit.
Further, the sealing end of the deformation unit is connected with the piezoelectric resonance element by adopting a flexible hinge.
Compared with the prior art, the utility model has the following beneficial effects:
1. the deformation unit is a multi-wave corrugated pipe, the cross section of the pipe wall along the axial direction is wavy, and the wall thickness of the pipe wall is 0.5-1 mm, so that the deformation unit has larger elasticity, large deformation amount and high sensitivity under a low pressure measurement environment, can be suitable for a low pressure sensor, can distinguish low pressure with high precision, and can effectively improve the sensitivity, resolution and stability of the pressure sensor.
2. The pressure transmission unit is internally provided with a transmission channel, and the diameter of the cross section of the transmission channel is 1.2-1.8 mm so as to control the speed of external gas and/or liquid entering the multi-wave corrugated pipe and play a role in buffering and damping.
3. The displacement unit, the transmission channel and the deformation unit are positioned on the same axis so as to improve the air tightness among the pressure transmission unit, the multi-wave corrugated pipe and the displacement unit and prevent pressure leakage.
4. The deformation unit is made of stainless steel, so that the deformation unit has excellent flexibility, corrosion resistance, high temperature resistance and high pressure resistance.
The utility model is described in further detail below with reference to the drawings and examples; the ultra-flexible bellows applied to the pressure sensor and the pressure sensor are not limited to the embodiment.
Drawings
FIG. 1 is a schematic cross-sectional view of an ultra-flexible bellows of the present utility model;
FIG. 2 is a schematic perspective view of the ultra-flexible bellows of the present utility model mated with a flexible hinge;
FIG. 3 is a schematic perspective view of the pressure sensor of the present utility model;
in the figure: 1. a pressure transmission unit; 11. an input port; 12. an output port; 13. a transmission channel; 14. a limit boss; 15. an external thread; 2. a multi-wave bellows; 3. a displacement unit; 10. an ultra-flexible bellows; 20. a housing; 30. a piezoelectric resonant element; 40. a flexible hinge.
Detailed Description
In the present utility model, for the description, the directions or positional relationships indicated by "inner" and "outer" and the like are used based on the directions or positional relationships shown in the drawings, only for convenience of description of the present utility model, and are not meant to indicate or imply that the apparatus must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the scope of protection of the present utility model. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
In addition, in the description of the present application, "and/or" describing the association relationship of the association object means that there may be three relationships, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.
Referring to fig. 1, the ultra-flexible bellows applied to a pressure sensor of the present utility model includes a pressure transmission unit 1 and a deformation unit, wherein the pressure transmission unit 1 is provided with an input port 11 and an output port 12 which are mutually communicated, the deformation unit is a hollow tube body which is expandable and deformable under stress, one end of the deformation unit is an open end, and the other end is a sealed end. The open end of the deformation unit is communicated with the output port 12 of the pressure transmission unit 1. The deformation unit is a multi-wave corrugated pipe 2, and the section shape of the pipe wall along the axial direction is wavy. Specifically, the wavy waveform is U-shaped, the geometric dimension is accurate, and the surface is not damaged after molding. The wall thickness of the pipe wall of the multi-wave corrugated pipe 2 is 0.5-1 mm, so that the multi-wave corrugated pipe has larger elasticity to meet the requirements of strength, flexibility and stability, and the multi-wave corrugated pipe is made of 316 stainless steel, so that the multi-wave corrugated pipe has excellent flexibility, corrosion resistance, high temperature resistance and high pressure resistance.
The pressure transmission unit 1 is internally provided with a transmission channel 13, through which transmission channel 13 the input port 11 communicates with the output port 12, and the external pressure is generated from gas and/or liquid, transmitted to the multiwave bellows 2 via the transmission channel 13. The cross section of the transmission channel 13 has a diameter of 1.2-1.8 mm. In this embodiment, the diameter of the cross section of the transmission channel 13 is 1.5mm, so that the speed of external gas and/or liquid entering the multi-wave bellows 2 can be controlled, and the damping effect is achieved.
In this embodiment, the multi-wave bellows 2 and the pressure transmission unit 1 are connected by laser welding, and the laser beam has very high energy density, so that the materials can be heated and melted rapidly, thereby realizing high-speed and efficient welding, the heating area of the laser welding is very small, so that the penetration depth is small, meanwhile, the welding speed is high, the heat affected zone is also very small, the welding seam of the laser welding is good in shape and stable in size, the defects are few, high-precision welding can be realized, and the overall air tightness of the device can be improved. In other embodiments, the pressure transmission unit 1 is provided with a screw thread at an end near the open end of the multiwave bellows 2, and the pressure transmission unit 1 is fixedly connected with the open end of the multiwave bellows 2 through the screw thread.
The utility model also comprises a displacement unit 3, and the other end of the multi-wave corrugated pipe 2 is fixedly connected with the displacement unit 3 to form a sealed end. When the external gas and/or liquid enters the multi-wave bellows 2, the gas and/or liquid is accumulated to a certain value to deform the multi-wave bellows 2, thereby pushing the displacement unit 3 to move along the axial direction of the multi-wave bellows 2. Specifically, the material of the displacement unit 3 is 316 stainless steel, and the displacement unit 3 and the multi-wave corrugated pipe 2 have the same thermal expansion coefficient and other properties, and are connected through welding, so that the displacement unit 3, the transmission channel 13 and the multi-wave corrugated pipe 2 are positioned on the same axis, and the air tightness among the pressure transmission unit 1, the multi-wave corrugated pipe 2 and the displacement unit 3 is improved.
The outer wall surface of the pressure transmission unit 1 is provided with a limiting boss 14, and the part of the outer wall surface of the pressure transmission unit 1 between the limiting boss 14 and the input port 11 is provided with an external thread 15, and is fixedly connected with an external pressure source through the external thread 15.
The multi-wave corrugated pipe 2 is formed by injecting high-pressure liquid (oil or water) into a pipe blank, expanding the pipe blank in a die, then compressing the pipe blank to enable the pipe blank to be plastically deformed to obtain the corrugated pipe with the preset thickness and shape, and forming the U-shaped corrugated pipe by multi-wave once. The molding process can be described as follows: a: placing a pipe blank; b: closing the mold and filling the medium; c: primary wave forming; d: forming multiple waves at one time; e: and (5) removing the die.
The ultra-flexible corrugated pipe applied to the pressure sensor can convert pressure into high-resolution displacement under the condition of bearing the pressure of 1kPa, and meanwhile, the deformation of the multi-wave corrugated pipe 2 is between 0 and 300 mu m, so that the ultra-flexible corrugated pipe has the characteristics of large deformation under low pressure, high-resolution sensitivity, long service life and good stability, and has good linear relation between the bearing pressure and the displacement.
Referring to fig. 2 and 3, a pressure sensor according to the present utility model includes an ultra-flexible bellows 10 as described above.
The pressure sensor further comprises a shell 20 and a piezoelectric resonance element 30, the sealing end of the multi-wave corrugated pipe 2 is connected with the piezoelectric resonance element 30 and is arranged in the shell 20, after the pressure sensor is arranged, the limiting boss 14 abuts against the outer side face of the shell 20 to limit the ultra-flexible corrugated pipe 10, and the piezoelectric resonance element 30 can generate corresponding electric signal output according to the moving size and direction of the multi-wave corrugated pipe 2.
The sealed end of the multiwave bellows 2 is connected to the piezoelectric resonator element 30 using a flexible hinge 40. The sealed end of the multiwave bellows 2 is welded with the flexible hinge 40 by laser.
The utility model relates to a pressure sensor, which has the following working principle: the pressure sensor is fixed with a pressure source in a sealing way through the external thread 15, when the pressure changes, the pressure changes and enters the multi-wave corrugated pipe 2 through the transmission channel 13, so that the multi-wave corrugated pipe 2 generates elastic deformation, the displacement unit 3 moves along the axial direction of the multi-wave corrugated pipe 2, the displacement unit is transmitted to the piezoelectric resonance element 30, the piezoelectric resonance element 30 with the piezoelectric effect generates corresponding electric signals according to the deformation size and direction of the multi-wave corrugated pipe 2, and after signal acquisition, the external pressure is detected.
The pressure sensor can measure the pressure of liquid and gas, the pressure cannot leak, and the pressure sensor has good pressure conversion efficiency. The device has the characteristics of simple structure, high reliability, wide measurement range, vibration resistance, corrosion resistance and the like, and can be widely applied to low-pressure measurement and control in the industries of chemical industry, medicine, food, environmental protection, pharmacy and the like.
The present utility model relates to a pressure sensor, and more particularly to a pressure sensor with ultra-flexible bellows, and a method for manufacturing the same.
The ultra-flexible corrugated pipe applied to the pressure sensor and the pressure sensor are the same as or can be realized by adopting the prior art in no part.
The above embodiment is only used for further illustrating an ultra-flexible bellows and a pressure sensor applied to the pressure sensor, but the utility model is not limited to the embodiment, and any simple modification, equivalent variation and modification of the above embodiment according to the technical substance of the utility model falls within the protection scope of the technical solution of the utility model.
Claims (10)
1. The ultra-flexible corrugated pipe comprises a pressure transmission unit and a deformation unit, wherein the pressure transmission unit is provided with an input port and an output port which are communicated with each other, the deformation unit is a hollow pipe body which can be expanded and deformed under stress, one end of the deformation unit is an open end, and the other end of the deformation unit is a sealed end; the opening end of the deformation unit is communicated with the output port of the pressure transmission unit; the method is characterized in that: the deformation unit is a multi-wave corrugated pipe, the cross section of the pipe wall along the axial direction is wavy, and the wall thickness of the pipe wall is 0.5-1 mm.
2. The ultra-flexible bellows for use in a pressure sensor of claim 1, wherein: the wavy waveform is U-shaped.
3. The ultra-flexible bellows for use in a pressure sensor of claim 1, wherein: the pressure transmission unit is internally provided with a transmission channel, and the input port is communicated with the output port through the transmission channel; the diameter of the cross section of the transmission channel is 1.2-1.8 mm.
4. The ultra-flexible bellows for use in a pressure sensor of claim 1, wherein: the device further comprises a displacement unit, wherein the other end of the deformation unit is fixedly connected with the displacement unit to form the sealing end.
5. The ultra-flexible bellows applied to a pressure sensor of claim 4, wherein: the displacement unit, the transmission channel and the deformation unit are positioned on the same axis.
6. The ultra-flexible bellows for use in a pressure sensor of claim 1, wherein: the pressure transmission unit is characterized in that a limiting boss is arranged on the outer wall surface of the pressure transmission unit, an external thread is arranged on the part, between the limiting boss and the input port, of the outer wall surface of the pressure transmission unit, and the pressure transmission unit is fixedly connected with an external pressure source through the external thread.
7. The ultra-flexible bellows for use in a pressure sensor of claim 1, wherein: the deformation unit is made of stainless steel.
8. A pressure sensor, characterized by: an ultra-flexible bellows comprising the application of any one of claims 1-7 to a pressure sensor.
9. The pressure sensor of claim 8, wherein: the piezoelectric resonator is characterized by further comprising a shell and a piezoelectric resonator element, wherein the sealing end of the deformation unit is connected with the piezoelectric resonator element and is arranged in the shell, and the piezoelectric resonator element can generate corresponding electric signal output according to the moving size and direction of the deformation unit.
10. The pressure sensor of claim 9, wherein: and the sealing end of the deformation unit is connected with the piezoelectric resonant element by adopting a flexible hinge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322285037.0U CN220751432U (en) | 2023-08-24 | 2023-08-24 | Be applied to pressure sensor's super gentle bellows and pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322285037.0U CN220751432U (en) | 2023-08-24 | 2023-08-24 | Be applied to pressure sensor's super gentle bellows and pressure sensor |
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| Publication Number | Publication Date |
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| CN220751432U true CN220751432U (en) | 2024-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202322285037.0U Active CN220751432U (en) | 2023-08-24 | 2023-08-24 | Be applied to pressure sensor's super gentle bellows and pressure sensor |
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| CN (1) | CN220751432U (en) |
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- 2023-08-24 CN CN202322285037.0U patent/CN220751432U/en active Active
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