Pressure sensor

Abstract

The invention discloses a pressure sensor, which comprises a shell defining a mounting cavity and provided with a pressure interface pipe; the integrated element comprises a cylinder body and a ring body, the cylinder body is partially inserted into the pressure connector pipe, the outer end of the cylinder body is closed, the inner end of the cylinder body is open, and the ring body is connected to the periphery of one end of the inner side of the cylinder body and extends towards the radial inner side; the pressure measuring assembly is arranged in the mounting cavity and compresses and seals the ring body on the periphery of one end of the inner side of the pressure connector pipe towards the outer side so as to receive the pressure of the medium to be measured introduced by the pressure connector pipe; wherein a detection cavity communicated to the inner side of the pressure connector pipe is defined between the inner side of the integrated element and the pressure measuring assembly, a pressure buffer channel allowing the to-be-measured medium to pass through is defined between the outer side of the integrated element and the inner wall of the shell, and one end of the inner side of the pressure buffer channel is communicated to the detection cavity. According to the pressure sensor, the pressure pulse of the medium to be measured can be suppressed, and damage caused by the instantaneous pressure pulse is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sensing, and in particular to a pressure sensor. BACKGROUND

[0002] A pressure sensor is a sensor for measuring the pressure of a medium to be measured, and is widely used in various industrial automatic control environments, such as petroleum pipelines, water conservancy and hydropower, railway transportation, intelligent buildings, production automatic control, aerospace, military industry, petrochemical industry, oil wells, electric power, ships, machine tools, hydraulic machinery, etc. Such a pressure sensor includes a piezoresistive pressure sensor, a capacitive pressure sensor, etc. Among them, the piezoresistive pressure sensor usually includes a diaphragm that can receive pressure and generate corresponding strain, and a measurement circuit composed of a strain element arranged on the diaphragm, so as to measure the pressure of the medium by measuring the degree of strain of the diaphragm.

[0003] The pressure of the medium to be measured can be instantaneously pulsed, which can easily generate excessive pressure on the pressure sensitive element, thereby damaging the pressure sensor. For example, the liquid in the pipeline can generate a water hammer effect when the valve is opened or closed, thereby instantaneously increasing the pressure in the pipeline by several times. SUMMARY

[0004] Therefore, the present application discloses a pressure sensor, which can effectively suppress pressure pulses when fluid passes through

[0005] The pressure sensor comprises,

[0006] a housing enclosing an installation cavity, having a pressure interface pipe;

[0007] a one-piece element comprising a barrel and a ring, the barrel being partially inserted into the pressure interface pipe, with an outer end closed and an inner end open, and the ring being connected to the periphery of the inner side of one end of the barrel and extending radially inward;

[0008] a pressure measurement assembly arranged in the installation cavity, which presses and seals the ring outwardly to the periphery of the inner side of the pressure interface pipe to receive the pressure of the medium to be measured introduced by the pressure interface pipe;

[0009] wherein the inner side of the one-piece element and the pressure measurement assembly enclose a detection cavity that is communicated to the inner side of the pressure interface pipe, and the outer side of the one-piece element and the inner wall of the housing enclose a pressure buffer channel that allows the medium to be measured to pass through and is communicated to the detection cavity at the inner side.

[0010] wherein the outer wall of the barrel and the inner wall of the pressure interface pipe enclose a first part of the pressure buffer channel, and the first part at least includes a spiral part around the barrel.

[0011] The spiral portion is surrounded by a spiral groove formed on the outer wall of the cylinder and the inner wall of the pressure interface pipe.

[0012] The outer wall of the cylinder has a flat portion on one side in the circumferential direction, which, together with the inner wall of the pressure interface pipe, forms a first part of the pressure buffering channel, which at least includes a return portion that returns along the flat portion.

[0013] The return portion is surrounded by a return groove formed on the flat portion and the inner wall of the pressure interface pipe.

[0014] The pressure buffering channel further includes a buffering cavity formed by the outer side of the integral element and the inner wall of the mounting cavity.

[0015] One end of the first part of the pressure buffering channel is connected to the detection cavity through the buffering cavity.

[0016] The integral element further includes inner and outer circumferential edges connected to the circumferential edge of the inner end of the cylinder and the transition portion of the ring body, respectively. The outer side of the transition portion and the inner wall of the shell form the buffering cavity, and the transition portion is provided with a through hole for connecting the buffering cavity to the detection cavity.

[0017] The transition portion is connected to the upper edge of the inner side of the ring body.

[0018] The outer end of the cylinder forms a thin-walled portion for transmitting the pressure of the medium to be measured to the detection cavity on the inner side.

[0019] The outer wall of the cylinder has a suitable wall thickness, so that the cylinder has sufficient rigidity to be inserted into the pressure interface pipe.

[0020] Compared with the prior art, the pressure sensor of the present application can suppress the pressure pulse of the medium to be measured, avoiding damage caused by instantaneous pressure pulse. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0022] Figure 1 The structure of the pressure sensor is shown in the figure.

[0023] Figure 2a partial view of the pressure sensor;

[0024] Figure 3 a structural view of the folded portion;

[0025] Figure 4 a structural view of the thin-walled portion of the barrel.

[0026] Reference Signs List:

[0027] 10, housing; 11, mounting cavity; 12, pressure port tube; 121, helical groove; 122, folded groove;

[0028] 20, integral component; 21, barrel; 211, thin-walled portion; 22, ring body; 23, transition portion; 231, through hole;

[0029] 30, pressure measurement assembly;

[0030] 41, pressure buffer channel;

[0031] 42, buffer cavity. DETAILED DESCRIPTION

[0032] For the purpose of promoting an understanding of the application, the application will now be described in greater detail with reference to the drawings. The embodiments shown in the drawings are intended only to illustrate the present application and should not be construed as limiting the present application. Rather, the purpose of the embodiments is to convey the disclosure of the present application.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0034] It will be understood that the spatially relative terms "beneath", "below", "lower", "under", "above", "upper" and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device can be otherwise oriented (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0035] It should be noted that when an element is referred to as being "connected", it can be directly connected to the other element or connected through an intermediate element. "Connected" in the following embodiments should be understood as "electrically connected", "communicatively connected" and the like if the circuits, modules, units and the like connected with each other have transmission of electrical signals or data.

[0036] As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. It should be understood that the term "comprises / comprising" or "has / having" specifies the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but does not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

[0037] The embodiment discloses a pressure sensor. The pressure sensor is intended to solve the problems that the pressure sensor is vulnerable to impact and easy to be damaged when the medium pressure suddenly changes, and to reduce the complexity and processing difficulty of the buffer structure of the pressure sensor.

[0038] Figure 1 The pressure sensor is shown to include a housing 10, an integrated element 20 and a pressure measuring assembly. The housing 10 is internally structured with a mounting cavity 11, which includes a pressure interface pipe 12 for introducing the pressure of the medium to be measured into the mounting cavity 11. The integrated element 20 includes an integrally formed barrel 21 and a ring body 22. The barrel 21 is inserted into the pressure interface pipe 12, and the outer end thereof is arranged to be closed, and the inner end is arranged to be open. The ring body 22 is connected to the periphery of the inner end opening of the barrel 21 and extends radially inward. The pressure measuring assembly 30 includes a substrate and a pressure sensitive element arranged on the substrate. The substrate is arranged in the mounting cavity 11 and tightly seals the ring body 22 on the periphery of the inner side of the pressure interface pipe 12 towards the outer side of the pressure interface pipe 12. The pressure sensitive element receives the pressure of the medium to be measured introduced by the pressure interface pipe 12, especially the suppressed pressure pulse of the medium to be measured.

[0039] Further, the inner side of the integrated element 20 and the pressure measuring assembly enclose a detection cavity which is communicated to the inner side of the pressure interface pipe 12. The outer side of the integrated element 20 and the inner wall of the housing 10 enclose a pressure buffer channel 41 which allows the medium to be measured to pass and is communicated to the detection cavity at the inner side. Therefore, the pressure buffer channel 41 is used to allow the medium to be measured to pass and suppress the pressure pulse that may be generated.

[0040] Further, Figure 2The first portion of the pressure buffering passage 41, which is formed by the outer wall of the cylinder 21 and the inner wall of the pressure interface pipe 12, includes a helical portion around the cylinder 21. The helical portion is formed by a helical groove 121 formed on the outer wall of the cylinder 21 and the inner wall of the pressure interface pipe 12. Thus, the pressure pulse of the medium to be measured is damped by the helical portion of the pressure buffering passage 41 before entering the detection chamber, thereby avoiding the damage to the pressure measurement assembly or the influence on the measurement data caused by the pressure pulse of the medium to be measured.

[0041] Optionally, the first portion of the pressure buffering passage 41 can be arranged at one or more positions of the inlet, the middle section or the outlet of the pressure buffering passage 41 where the medium to be measured is introduced.

[0042] Further, the helical portion can be formed by a helical groove 121 formed on the pressure interface pipe 12 and the outer wall of the cylinder 21. Similarly, the helical portion can also be formed by a first helical groove 121 formed on the pressure interface pipe 12 and a second helical groove 121 formed on the cylinder 21.

[0043] In some embodiments, Figure 3 The outer wall of the cylinder 21 has a flat portion on one side thereof. The flat portion and the inner wall of the pressure interface pipe 12 form a first portion of the pressure buffering passage 41 which is radially directed. The first portion of the pressure buffering passage 41 includes a return portion which is folded back along the flat portion. The return portion is formed by a return groove 122 formed on the flat portion and the inner wall of the pressure interface pipe 12. Thus, like the helical portion, the pressure pulse of the medium to be measured is damped by the return portion of the pressure buffering passage 41 before entering the detection chamber, thereby avoiding the damage to the pressure measurement assembly or the influence on the measurement data caused by the pressure pulse of the medium to be measured.

[0044] Further, the return portion can be formed by a return groove 122 formed on the pressure interface pipe 12 and the outer wall of the flat portion. Similarly, the return portion can also be formed by a return groove 122 formed on the flat portion and a return groove 122 formed on the pressure interface pipe 12.

[0045] In some embodiments, the first portion of the pressure buffering passage 41 is arranged as a helical portion and the second portion is arranged as a return portion. The first portion and the second portion can be arranged in one or more positions of the pressure buffering passage 41 in various combinations.

[0046] Further, Figure 1The pressure buffering channel 41 further comprises a buffering cavity 4242 formed by the outer side of the one-piece element 20 and the inner wall of the mounting cavity 11. The inner side of the first portion of the pressure buffering channel 41 is connected to the detection cavity through the buffering cavity 4242. Specifically, the one-piece element 20 further comprises a transition portion 23 connected to the inner side of the peripheral edge of the barrel 21. The transition portion 23 is annular in shape and has a gap between its outer side and the inner wall of the housing 10, which forms the buffering cavity 4242. The transition portion 23 is provided with one or more through holes 231 for connecting the buffering cavity 4242 to the detection cavity.

[0047] Optionally, Figure 1 The transition portion 23 is connected to the upper edge of the inner side of the ring body 22, and the buffering cavity 4242 is formed by the outer side of the transition portion 23, the lower edge of the inner side of the ring body 22, and the inner wall of the housing 10.

[0048] Further, Figure 4 The outer end of the barrel 21 is provided with a thin-walled portion 211 for transmitting the pressure pulse of the medium to be measured to the detection cavity. The thin-walled portion 211 is formed by thinning the outer end of the barrel 21 relative to its peripheral wall. Thus, the thin-walled portion 211 can transmit the pressure pulse of the medium to be measured to the detection cavity, avoiding measurement delay caused by the pressure pulse of the medium to be measured passing through the pressure buffering channel 41, the buffering cavity 4242, and the through holes 231.

[0049] In addition, the peripheral wall of the barrel 21 and the connection between the peripheral wall and the outer end of the barrel 21 have a suitable wall thickness, so that the barrel 21 has sufficient rigidity for insertion into the pressure interface tube 12 from the outer side.

[0050] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A pressure sensor, characterized in that, include, The outer shell forming an installation cavity has a pressure interface tube; An integrated component includes a cylindrical body and a ring body. The cylindrical body is inserted into the pressure interface tube, with its outer end closed and its inner end open. The ring body is connected to the periphery of one inner end of the cylindrical body and extends radially inward. The pressure measuring component installed in the mounting cavity presses and seals the ring body against the outer periphery of one inner end of the pressure interface tube to receive the pressure of the medium to be measured introduced by the pressure interface tube. The inner side of the integrated element and the pressure measuring assembly form a detection cavity that connects to the inner side of the pressure interface tube. The outer side of the integrated element and the inner wall of the housing form a pressure buffer channel that allows the medium to be measured to pass through and whose inner end connects to the detection cavity.

2. The pressure sensor according to claim 1, characterized in that, The outer wall of the cylinder and the inner wall of the pressure interface pipe together form the first part of the pressure buffer channel, and the first part includes at least a spiral portion surrounding the cylinder.

3. The pressure sensor according to claim 2, characterized in that, The spiral portion is formed by a spiral groove formed on the outer wall of the cylinder and the inner wall of the pressure interface pipe.

4. The pressure sensor according to claim 1, characterized in that, The outer wall of the cylinder has a straight section on one circumferential side. The straight section and the inner wall of the pressure interface pipe together form the first part of the pressure buffer channel. The first part includes at least a folded-back section that folds back and forth along the straight section.

5. The pressure sensor according to claim 4, characterized in that, The folded portion is formed by a folded groove formed on the straight portion and the inner wall of the pressure interface tube.

6. The pressure sensor according to any one of claims 1 to 5, characterized in that, The pressure buffer channel also includes a buffer cavity formed by the outer side of the integrated component and the inner wall of the mounting cavity. One end of the inner side of the first part of the pressure buffer channel is connected to the detection cavity through the buffer cavity.

7. The pressure sensor according to claim 6, characterized in that, The integrated component also includes a transition portion whose inner and outer peripheries are respectively connected to the periphery of the inner end of the cylinder and the ring body. The outer side of the transition portion and the inner wall of the outer shell form the buffer cavity. The transition portion is provided with a through hole that connects the buffer cavity to the detection cavity.

8. The pressure sensor according to claim 7, characterized in that, The transition section is connected to the upper edge of the inner side of the ring body.

9. The pressure sensor according to any one of claims 1 to 5, characterized in that, The outer end of the cylinder forms a thin-walled section for transmitting the pressure of the medium to be measured to the detection chamber inside.

10. The pressure sensor according to any one of claims 1 to 5, characterized in that, The outer wall of the cylinder has a suitable wall thickness so that the cylinder has sufficient rigidity to be inserted into the pressure interface pipe outward.

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