A pressure sensing element

Abstract

This invention proposes a pressure sensing element, comprising: a diaphragm base, a diaphragm, a top post, and a connector. The diaphragm base and the connector are fixedly connected. The diaphragm base has a first through hole, and the connector has a second through hole. The first and second through holes are interconnected and directly opposite each other. A limiting groove is formed on the side of the diaphragm base near the connector and / or on the side of the connector near the diaphragm base. The diaphragm is embedded in the limiting groove, with its edge completely fitting the inner wall of the limiting groove. The diaphragm separates the first and second through holes. The top post is slidably disposed within the first through hole. The diaphragm can deform along the axis of the first through hole and push the top post to slide within the first through hole. This invention improves the installation accuracy of the diaphragm and reduces pressure transmission deviation caused by inaccurate diaphragm installation by providing a limiting groove at the diaphragm installation position.

Description

Technical Field

[0001] This invention relates to the field of sensor technology, and in particular to a pressure sensing element. Background Technology

[0002] A diaphragm pressure sensor is a sensing device that uses pressure changes to generate diaphragm deformation, and then uses the diaphragm deformation to perform corresponding switching control or pressure detection. The specific working principle includes: when the diaphragm is subjected to pressure from the transmission medium, it overcomes the internal stress of the diaphragm, thereby causing the diaphragm to deform. The deformed diaphragm triggers an external switching structure or sensor element, thereby achieving the purpose of switching control or pressure detection.

[0003] In the prior art, the diaphragm needs to be fixedly installed on the base. Therefore, the part of the diaphragm used for triggering is relatively fixed. The position of the corresponding switch structure or sensor element used to link with the diaphragm is also designed to correspond to the trigger part. However, the diaphragm is prone to positional deviation when it is fixedly installed. This will cause the trigger part of the diaphragm to shift in position. The diaphragm with a shifted position will have a poor triggering effect on the switch structure and sensor element. Summary of the Invention

[0004] In view of this, the present invention proposes a pressure sensing element, which aims to solve the problem that the pressure transmission effect of current pressure sensing elements is poor, resulting in sensor insensitivity.

[0005] The technical solution of the present invention is implemented as follows: The present invention provides a pressure sensing element, including: a diaphragm base, a diaphragm, a top post, and a connector. The diaphragm base and the connector are fixedly connected. A first through hole is provided on the diaphragm base, and a second through hole is provided on the connector. The first through hole and the second through hole are interconnected and directly opposite each other. A limiting groove is provided on the side of the diaphragm base near the connector and / or on the side of the connector near the diaphragm base. The diaphragm is embedded in the limiting groove, and the edge of the diaphragm is completely in contact with the inner wall of the limiting groove. The diaphragm separates the first through hole and the second through hole. The top post is slidably disposed in the first through hole. The diaphragm can deform along the axial direction of the first through hole and push the top post to slide in the first through hole.

[0006] In some embodiments, the first through hole is a stepped hole, the first through hole includes a stepped surface, the top post includes a supporting surface, and during the sliding process of the top post in the first through hole, the supporting surface selectively abuts against the stepped surface.

[0007] In some embodiments, an elastic limiting member is also included. The elastic limiting member is fixedly installed on the inner wall of the first through hole. The elastic limiting member is detachably connected to the side of the top column. Under the action of the elastic limiting member, the top column can reciprocate along the first through hole for a certain distance. When the diaphragm is not deformed, the top column and the diaphragm are spaced apart.

[0008] In some embodiments, the elastic limiting member includes a disc spring, which is embedded in the first through hole. The plane of the disc spring is perpendicular to the axial direction of the first through hole. The outer end of the disc spring is fixedly connected to the inner wall of the first through hole, and the inner end of the disc spring is detachably connected to the side wall of the top column.

[0009] In some embodiments, the side wall of the top column is provided with a through groove and an annular groove. The through groove is parallel to the axial direction of the top column, and the annular groove is provided along the circumference of the top column. The through groove and the annular groove are connected to each other, and the inner end of the coil spring is embedded in the annular groove.

[0010] In some embodiments, the inner wall of the first through hole is provided with an annular mounting groove along the circumferential direction, and the elastic limiting member is embedded in the annular mounting groove.

[0011] In some embodiments, a limiting protrusion is provided on the side of the top post near the diaphragm, and a limiting groove is provided on the side of the diaphragm base near the connector, with the limiting protrusion embedded in the limiting groove.

[0012] In some implementations, there are two coil springs, which are spaced apart.

[0013] In some embodiments, the distance between the ends of the two outer coils of the disc spring along the axis of the first through hole is less than the distance between the ends of the two inner coils of the disc spring along the axis of the first through hole.

[0014] The pressure sensing element of the present invention has the following advantages over the prior art:

[0015] This invention provides a pressure sensing element that improves the installation accuracy, convenience, and consistency of the diaphragm by creating a limiting groove, ensuring that the contact point between the diaphragm and the top post meets design requirements. This reduces the problem of inaccurate pressure transmission between the diaphragm and the top post caused by diaphragm positional deviation, and improves the accuracy of pressure transmission during the application of this pressure sensing element. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a cross-sectional view of the pressure sensing element of the present invention;

[0018] Figure 2 This is a cross-sectional view of a pressure sensing element according to one embodiment of the present invention;

[0019] Figure 3 This is a cross-sectional view of a pressure sensing element according to one embodiment of the present invention;

[0020] Figure 4 This is a cross-sectional view of a pressure sensing element according to one embodiment of the present invention;

[0021] Figure 5 This is an isometric view of the top column in the pressure sensing element of the present invention;

[0022] Figure 6 This is an isometric view of the top post and elastic limiting member in the pressure sensing element of the present invention;

[0023] Figure 7 for Figure 1 A magnified view of part A in the middle.

[0024] In the figure: 1-Diaphragm base, 2-Diaphragm, 3-Top column, 4-Connector, 5-Elastic limiting component, 6-Limiting groove, 11-First through hole, 111-Stepped surface, 112-Annular mounting groove, 12-Limiting groove, 31-Abutting surface, 32-Through groove, 33-Annular groove, 34-Limiting protrusion, 41-Second through hole, 51-Coil spring. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0026] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0027] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and 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. Therefore, they should not be construed as limitations on this application.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0029] Unless otherwise defined, all technical terms and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiments of this invention pertain. If any definition stated in this section is contrary to or otherwise inconsistent with a definition stated in a patent, patent application, published patent application, or other publication incorporated herein by reference, the definitions listed here shall prevail over those incorporated herein by reference.

[0030] like Figure 1 As shown, combined with Figure 2-7 The pressure sensing element of the present invention includes: a diaphragm base 1, a diaphragm 2, a top post 3, and a connector 4. The diaphragm base 1 and the connector 4 are fixedly connected. The diaphragm base 1 has a first through hole 11, and the connector 4 has a second through hole 41. The first through hole 11 and the second through hole 41 are interconnected and face each other. A limiting groove 6 is formed on the side of the diaphragm base 1 near the connector 4 and / or on the side of the connector 4 near the diaphragm base 1. The diaphragm 2 is embedded in the limiting groove 6, and the edge of the diaphragm 2 is completely fitted with the inner wall of the limiting groove 6. The diaphragm 2 separates the first through hole 11 and the second through hole 41. The top post 3 is slidably disposed in the first through hole 11. The diaphragm 2 can deform along the axial direction of the first through hole 11 and push the top post 3 to slide in the first through hole 11.

[0031] In the above embodiments, the diaphragm 2 is fixedly installed in the limiting groove 6. The limiting groove 6 is used to position the diaphragm 2 and prevent the diaphragm 2 from shifting position. Figure 2 As shown, as one feasible solution, the limiting groove 6 is formed on the side of the diaphragm base 1 near the connector 4; as Figure 3 As shown, as one feasible solution, a first limiting groove 6 is provided on the side of the diaphragm base 1 near the connector 4, and a second limiting groove 6 is provided on the side of the connector 4 near the diaphragm base 1. The two limiting grooves 6 are arranged opposite each other. When the diaphragm base 1 and the connector 4 are fixedly connected, the limiting grooves 6 on both sides merge to form a cavity of a limiting groove 6; Figure 4 As shown, the limiting groove 6 is formed on the side of the connector 4 near the diaphragm base 1.

[0032] In the above embodiments, the installation method of the diaphragm 2 includes: when there is one limiting groove 6 and it is located on the connector 4, the diaphragm 2 is embedded in the limiting groove 6, and then the diaphragm 2 is fixedly connected to the structure where the limiting groove 6 is located. Specifically, the fixed connection can be made by welding. After the connection is completed, the top post 3 is embedded in the first through hole 11, and then the diaphragm base 1 and the connector 4 are fixedly connected, thereby completing the assembly of the pressure sensing element. When there is one limiting groove 6 and it is located on the diaphragm base 1, the top post 3 is embedded in the first through hole 11, and then the diaphragm 2 is embedded in the limiting groove 6. Then the diaphragm 2 is fixedly connected to the structure where the limiting groove 6 is located. After the connection is completed, the diaphragm base 1 and the connector 4 are fixedly connected, thereby completing the assembly of the pressure sensing element. When there are two limiting grooves 6, the top post 3 is embedded in the first through hole 11, the diaphragm 2 is embedded in one of the limiting grooves 6, and then the diaphragm 2 is fixedly connected to the structure where the limiting groove 6 is located. Specifically, the connection can be fixed by welding. After the connection is completed, the diaphragm base 1 and the connector 4 are fixedly connected to complete the assembly of the pressure sensing element.

[0033] In the above embodiments, the second through hole 41 on the side where the connector 4 is located serves as a pressure medium cavity. The medium generates pressure and acts on the diaphragm 2. When the pressure difference between the two sides of the diaphragm 2 exceeds the threshold, the diaphragm 2 deforms accordingly. During the deformation process, the diaphragm 2 abuts against the surface of the top post 3 and drives the top post 3 to slide within the first through hole 11, thereby enabling linkage with external sensor components to achieve pressure sensing. Compared with conventional diaphragm fixing methods, after being limited by the limiting groove 6, the installation position of the diaphragm 2 is accurate, the contact position between it and the top post 3 is stable, and it has a good triggering effect.

[0034] In some embodiments, the first through hole 11 is a stepped hole, the first through hole 11 includes a stepped surface 111, the top post 3 includes a supporting surface 31, and during the sliding process of the top post 3 in the first through hole 11, the supporting surface 31 selectively abuts against the stepped surface 111.

[0035] In the above embodiments, the top post 3 needs to slide within the first through hole 11. By providing the abutment surface 31 and the stepped surface 111, the top post 3 can be prevented from detaching from the first through hole 11. Specifically, the top post 3 has a circumferential protrusion structure at one end near the diaphragm 2. The surface of the protrusion structure has the abutment surface 31. The stepped surface 111 is spaced apart from the diaphragm 2 to form a sliding cavity. The protrusion structure is located in the sliding cavity and moves along the axial direction of the first through hole 11. At the same time, due to the provision of the stepped surface 111 and the abutment surface 31, the contact area of ​​the top post 3 on the side near the diaphragm 2 can be effectively increased, which is beneficial to improving the stability of pressure transmission between the diaphragm 2 and the top post 3. At the same time, it can avoid the damage to the structure of the diaphragm 2 or the impact on the structural stability of the diaphragm 2 caused by excessive pressure acting on the surface of the diaphragm 2 due to the small contact area. Furthermore, after the provision of the stepped surface 111 and the abutment surface 31, the overall installation orientation of the pressure sensing element is not restricted. Even under the action of gravity, the top post 3 can be kept within the first through hole 11.

[0036] In some embodiments, the device further includes an elastic limiting member 5, which is fixedly installed on the inner wall of the first through hole 11. The elastic limiting member 5 is detachably connected to the side of the top post 3. Under the action of the elastic limiting member 5, the top post 3 can reciprocate along the first through hole 11 for a certain distance. When the diaphragm 2 is not deformed, the top post 3 and the diaphragm 2 are spaced apart.

[0037] In the above embodiments, the top column 3, as a conductive element, needs to transmit the deformation of the diaphragm 2. Therefore, the top column 3 adopts a rigid structure. In practical applications, the top column 3 has a certain weight. In some installation methods, the gravity of the top column 3 may act on the surface of the diaphragm 2. This gravity will offset part of the pressure transmitted by the diaphragm 2, thus affecting the accuracy of the external pressure transmission structure's response to pressure. To avoid the influence of the gravity of the top column 3, it can be kept below the diaphragm 2 during installation. In this case, the top column 3 will move away from the diaphragm 2 under the action of gravity. However, this... At the same time, the gravity of the top column 3 will still affect the accuracy of the external pressure sensing component. In the above embodiment, an elastic limiting member 5 is used to elastically support the top column 3. Under the action of the elastic limiting member 5, the gravity generated by the weight of the top column 3 itself is completely or partially canceled. From a mechanical point of view, the top column 3 can be regarded as an ideal rigid component with no mass, thereby improving the accuracy of pressure sensing. Preferably, the elastic limiting member 5 can be a component with constant elastic force. Under the condition of elastic deformation within a certain range, the elastic force of the component remains constant.

[0038] In the above embodiments, on the other hand, in order to avoid friction with the inner wall of the first through hole 11 as much as possible during the sliding process of the top post 3 in the first through hole 11, so as not to affect the pressure sensing, the best setting is to set the inner wall of the first through hole 11 and the top post 3 at intervals. While setting the intervals, it is necessary to keep the top post 3 from shifting in the preset position. At this time, the elastic limiting member 5 can use its own supporting and limiting function to achieve the corresponding purpose, thereby further improving the pressure sensing accuracy of the overall components.

[0039] In some embodiments, the elastic limiting member 5 includes a coil spring 51, which is embedded in the first through hole 11. The plane of the coil spring 51 is perpendicular to the axial direction of the first through hole 11. The outer end of the coil spring 51 is fixedly connected to the inner wall of the first through hole 11, and the inner end of the coil spring 51 is detachably connected to the side wall of the top post 3.

[0040] In the above embodiments, the coil spring 51 can be a constant force coil spring. The coiling plane of the coil spring 51 is perpendicular to the axial direction of the first through hole 11. During the deformation of the coil spring 51, the deformation of the coil spring will not affect the movement of the top column 3. Through the support of the coil spring 51, the interference of gravity factors caused by the top column 3 is effectively reduced.

[0041] In some embodiments, the side wall of the top post 3 is provided with a through groove 32 and an annular groove 33. The through groove 32 is parallel to the axial direction of the top post 3, and the annular groove 33 is provided along the circumferential direction of the top post 3. The through groove 32 and the annular groove 33 are interconnected, and the inner ring end of the coil spring 51 is embedded in the annular groove 33.

[0042] In the above embodiments, in order to facilitate the connection between the top post 3 and the disc spring 51, a through groove 32 and an annular groove 33 are provided on the side of the top post 3. The specific installation steps include: first, the side of the top post 3 with the through groove 32 faces the position of the inner ring connecting end of the disc spring 51, and then the top post 3 is inserted into the first through hole 11. At this time, the inner ring connecting end of the disc spring 51 slides in the through groove 32. When it slides to the position of the annular groove 33, the push of the top post 3 is stopped, and the top post 3 is rotated at the same time so that the inner ring end of the disc spring 51 slides into the annular groove 33, thereby completing the installation of the top post 3.

[0043] In the above embodiments, the annular groove 33 may cause the top column 3 to slide out easily. Therefore, an inclined groove can be provided at the opening where the annular groove 33 and the through groove 32 are connected. By connecting the annular groove 33 and the through groove 32 with the inclined groove, the risk of the top column 3 sliding out directly from the annular groove 33 can be reduced.

[0044] In some embodiments, the annular groove 33 can be a perfect circle or an irregular annular structure. A groove for engaging the end of the disc spring 51 can also be provided in the annular groove 33. When the disc spring 51 slides to the groove position, the end of the disc spring 51 engages with the groove.

[0045] In some embodiments, the inner wall of the first through hole 11 is provided with an annular mounting groove 112 along the circumferential direction, and the elastic limiting member 5 is embedded in the annular mounting groove 112.

[0046] In the above embodiments, since the movable gap between the first through hole 11 and the top post 3 is relatively small, in order to avoid the insertion of the elastic limiting member 5 from hindering the reciprocating motion of the top post 3, an annular mounting groove 112 is opened along the circumferential direction on the inner wall of the first through hole 11, thereby providing installation space for the elastic limiting member 5, effectively reducing the obstruction of the movement of the top post 3 by the elastic limiting member 5. At the same time, the annular mounting groove 112 can also limit the elastic deformation of the elastic limiting member 5, thereby preventing the top post 3 from destroying the structural stability of the elastic limiting member 5 under huge deformation.

[0047] In some embodiments, a limiting protrusion 34 is provided on one side of the top post 3 near the diaphragm 2, and a limiting groove 12 is provided on the side of the diaphragm base 1 near the connector 4, with the limiting protrusion 34 embedded in the limiting groove 12.

[0048] In the above embodiments, in order to further improve the connection stability between the disc spring 51 and the top post 3 and prevent the top post 3 from separating from the disc spring 51, a limiting protrusion 34 is provided on the side of the top post 3. The limiting protrusion 34 is embedded in the limiting groove 12. At this time, the top post 3 cannot rotate freely in the first through hole 11. Specifically, the limiting groove 12 is opened on the side wall of the limiting groove 6. During the sliding process of the top post 3 in the first through hole 11, the limiting protrusion 34 is always located in the limiting groove 12.

[0049] In some embodiments, the number of coil springs 51 is two, and the two coil springs 51 are arranged at intervals.

[0050] In the above embodiments, the two disc springs 51 can be arranged in parallel. After being arranged in parallel, the forces generated by the two disc springs 51 are also parallel to each other, which is beneficial to improving the force balance and installation stability of the top column 3. Since the connection between one disc spring 51 and the top column 3 is a point connection, the top column 3 will deflect relative to the connection point under the action of gravity. After the deflection, the top column 3 is prone to friction on the inner wall of the first through hole 11, which will affect the pressure sensing of the top column 3. The above embodiments use two disc springs 51, thereby increasing the connection point between the top column 3 and the disc spring 51, forming a similar line contact or surface contact, and improving the stability of the top column 3.

[0051] In the above embodiments, preferably, the connection points of the two coil springs 51 near the top column 3 can be located at different positions of the top column 3. At this time, the torque generated by the gravity of the top column 3 at the two connection points is the same in magnitude and opposite in direction, which can cancel each other out, thereby preventing the top column 3 from deflecting due to gravity and affecting the accuracy of its pressure sensing.

[0052] In some embodiments, the number of coil springs 51 may be greater than two, and the multiple coil springs 51 are spaced apart. Preferably, the planes on which the multiple coil springs 51 are located are parallel to each other.

[0053] In the above embodiments, multiple coil springs 51 can further improve the connection points of the top post 3, thereby improving the posture stability of the top post 3 and avoiding friction between the top post 3 and the inner wall of the first through hole 11, which would affect the pressure transmission of the top post 3. The plane where the coil spring 51 is located is the plane where the coil spring 51 is located in the unstretched state.

[0054] In some embodiments, the distance between the outer ends of the two coil springs 51 along the axis of the first through hole 11 is less than the distance between the inner ends of the two coil springs 51 along the axis of the first through hole 11.

[0055] In the above embodiments, both coil springs 51 maintain a deformed state relative to the top column 3, and the forces of the two coil springs 51 are in opposite directions. At this time, the two coil springs 51 can not only maintain the posture and position stability of the top column 3, but also, when the top column 3 is displaced by the action of the diaphragm 2, within a certain displacement range, the forces exerted by the two coil springs 51 on the top column 3 change. During the change, the forces of the two coil springs 51 can compensate for each other, so that the resultant force of the two coil springs 51 approaches no change. When the resultant force of the two coil springs 51 is used to overcome the self-weight of the top column 3, the force from the diaphragm 2 will not change after being transmitted through the top column 3, which is beneficial to improving the sensitivity of the pressure sensing element.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pressure sensing element, characterized in that, include: The system comprises a diaphragm base, a diaphragm, a top post, a connector, and an elastic limiting member. The diaphragm base and the connector are fixedly connected. The diaphragm base has a first through hole, and the connector has a second through hole. The first and second through holes are interconnected and directly opposite each other. A limiting groove is formed on the side of the diaphragm base near the connector and / or on the side of the connector near the diaphragm base. The diaphragm is embedded in the limiting groove, and its edge is completely fitted with the inner wall of the limiting groove. The diaphragm separates the first and second through holes. The top post is slidably disposed within the first through hole. The diaphragm can deform along the axis of the first through hole and push the top post to slide within the first through hole. The first through hole is a stepped hole, including a stepped surface. The top post includes a supporting surface. During the sliding process of the top post within the first through hole, the supporting surface selectively abuts against the stepped surface. The elastic limiting member is fixedly installed on the inner wall of the first through hole. The elastic limiting member and the top post... The top column is detachably connected to the side. Under the action of the elastic limiting member, it can reciprocate along the first through hole for a certain distance. When the diaphragm is not deformed, the top column and the diaphragm are spaced apart. The elastic limiting member includes a disc spring, which is embedded in the first through hole. The plane of the disc spring is perpendicular to the axis of the first through hole. The outer end of the disc spring is fixedly connected to the inner wall of the first through hole. The inner end of the disc spring is detachably connected to the side wall of the top column. The side wall of the top column has a through groove and an annular groove. The through groove is parallel to the axis of the top column. The annular groove is opened along the circumference of the top column. The through groove and the annular groove are interconnected. The inner end of the disc spring is embedded in the annular groove. The inner wall of the first through hole has an annular mounting groove along the circumference. The elastic limiting member is embedded in the annular mounting groove. The side of the top column near the diaphragm has a limiting protrusion. The side of the diaphragm base near the connector has a limiting groove. The limiting protrusion is embedded in the limiting groove.

2. The pressure sensing element as described in claim 1, characterized in that, There are two coil springs, which are spaced apart.

3. The pressure sensing element as described in claim 2, characterized in that, The distance between the ends of the two outer coils of the disc springs along the axis of the first through hole is less than the distance between the ends of the two inner coils of the disc springs along the axis of the first through hole.

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