Pressure sensor and pressure device

Abstract

The present invention provides a pressure sensor, including a mounting seat provided with a receiving cavity and a plurality of fixing holes, a sensing circuit assembly provided in the receiving cavity, the sensing circuit assembly having a plurality of pressure sensing elements, a plurality of fixing assemblies respectively provided in the plurality of fixing holes and partially inserted into the receiving cavity, each fixing assembly including an adjusting member and a force transmitting member independently formed from each other, one end of the force transmitting member abuts against the sensing circuit assembly, and the other end abuts against the adjusting member, and the adjusting member is fixedly connected to the mounting seat; the present invention also provides a pressure device. The pressure sensor provided by the present invention can realize the pre-pressure of the sensor to be independently adjusted, and the component force in the horizontal direction is decomposed by the abutment between the convex part of the force transmitting member and the concave part of the adjusting member, thereby reducing the risk of damage to the pressure sensing element.

Description

Technical Field

[0001] The present invention belongs to the technical field of sensors, and more specifically, relates to a pressure sensor and a pressure device. Background Art

[0002] With the continuous advancement of science and technology, most toll roads use weight-based charging to charge different types of vehicles. As a result, the use of dynamic weighing as a weighing measurement for vehicles passing through is becoming more and more widespread, making various dynamic weighing devices widely used.

[0003] In the prior art, the sensor plays the main role in the dynamic weighing process. The dynamic weighing device usually uses a plurality of sensors with built-in pressure sensing elements arranged side by side in a housing, which is pressed by a steel plate, and is provided with a plurality of screws corresponding to each sensor to maintain a certain pre-tightening force, so as to detect the weight of the weighed object according to the pressure it receives. The dynamic weighing device cannot independently adjust the pre-pressure of each unit sensor during the assembly process. There is a horizontal component force generated by the pre-tightening of the screws and the flatness of the steel plate, which leads to the risk of the pressure sensing element being broken. At the same time, in order to ensure the consistency of the assembly process requirements, its assembly is more difficult, which reduces the production efficiency. Summary of the invention

[0004] The object of the present invention is to provide a pressure sensor to solve the technical problem that the pressure sensor in the prior art cannot independently adjust the pre-pressure of multiple sensors built into the housing, resulting in the risk of breakage of the pressure sensing element of the sensor.

[0005] To achieve the above-mentioned object, the technical solution adopted by the present invention is: to provide a pressure sensor, comprising: a mounting seat, provided with an accommodating cavity and a plurality of fixing holes;

[0006] A sensing circuit assembly is disposed in the accommodating cavity, wherein the sensing circuit assembly has a plurality of pressure sensing elements;

[0007] A plurality of fixing components are respectively disposed in the plurality of fixing holes and partially placed in the accommodating cavity;

[0008] Each of the fixed components includes an adjusting member and a force transmitting member which are independently formed from each other. One end of the force transmitting member abuts against the sensing circuit component, and the other end abuts against the adjusting member. The adjusting member is fixedly connected to the mounting seat.

[0009] Furthermore, the inner surface of the mounting seat located at the accommodating cavity is recessed inward to form a limiting groove, and the sensing circuit component is fixed in the limiting groove.

[0010] Furthermore, the inner surface of the mounting seat located at the fixing hole is provided with an internal thread, and the outer surface of the adjusting member is provided with an external thread corresponding to the internal thread.

[0011] Furthermore, the pressure sensor further comprises a pressing plate, and the pressing plate is fixed on another surface of the mounting base opposite to the surface to which the fixing component is connected.

[0012] Furthermore, the sensing circuit assembly includes a first electrode sheet, a second electrode sheet, and a bracket arranged between the first electrode sheet and the second electrode sheet, and a plurality of the pressure sensing elements are mounted on the bracket, and the first electrode sheet and the second electrode sheet are electrically connected to the plurality of the pressure sensing elements.

[0013] Furthermore, the bracket is provided with a plurality of mounting holes for mounting a plurality of the pressure sensing elements, and the plurality of the pressure sensing elements are all in contact with the first electrode sheet and the second electrode sheet.

[0014] Furthermore, the pressure sensing element is a quartz wafer, and the pressure sensing element, the force transmission member and the adjustment member are all coaxially arranged.

[0015] Furthermore, the pressure sensor also includes an insulating member, and the insulating member is arranged between the first electrode sheet and the fixing component.

[0016] Furthermore, the bracket is an insulating bracket.

[0017] Furthermore, the force transmission member is a stainless steel member.

[0018] Furthermore, the mounting seat includes a connecting neck for concentrating stress, and the connecting neck includes an inwardly recessed portion formed on opposite sides of the mounting seat in a direction perpendicular to the surface of the mounting seat where the fixing hole is formed, and the recessed portion is symmetrically arranged and filled with insulating foam.

[0019] Furthermore, a convex portion is formed on the surface of one end of the force transmission member abutting against the adjustment member.

[0020] Furthermore, the surface of one end of the adjusting member abutting against the force transmitting member is inwardly recessed to form a recessed portion for the raised portion to be placed in.

[0021] Furthermore, the raised portion of the force transmission member is hemispherical, and the recessed portion of the adjustment member is hemispherical.

[0022] The present invention also provides a pressure device, comprising a housing and the above-mentioned pressure sensor arranged in the housing.

[0023] The beneficial effect of the pressure sensor provided by the present invention is that compared with the prior art, the pressure sensor of the present invention is provided with a fixing hole on the mounting base for fixing the connection of the fixing component, the force transmission member of the fixing component is arranged in the accommodating cavity of the mounting base and abuts against the sensing circuit component, and the adjusting member abutting against the force transmission member is fixedly connected in the fixing hole of the mounting base, thereby realizing that the pre-pressure of the sensor can be independently adjusted, realizing load decoupling, decomposing the horizontal component of the force applied to the pressure sensor, and reducing the risk of damage to the pressure sensing element.

[0024] The pressure device equipped with the above-mentioned pressure sensor can independently adjust the pre-pressure of the sensor, realize load decoupling, decompose the horizontal component of the force applied to the pressure sensor, and reduce the risk of damage to the pressure sensing element. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 A schematic diagram of the three-dimensional structure of a pressure sensor provided by an embodiment of the present invention;

[0027] Figure 2 A schematic diagram of the explosion structure of a pressure sensor provided by an embodiment of the present invention;

[0028] Figure 3 A transverse cross-sectional view of a pressure sensor provided by an embodiment of the present invention along a fixing assembly;

[0029] Figure 4 for Figure 3 A schematic diagram of the enlarged structure at A in the middle;

[0030] Figure 5 A transverse cross-sectional view of a mounting seat of a pressure sensor provided by an embodiment of the present invention along the mounting seat;

[0031] Figure 6 A schematic diagram of the main structure of a force transmission member of a pressure sensor provided in an embodiment of the present invention;

[0032] Figure 7 A schematic diagram of the axial cross-sectional structure of an adjusting member of a pressure sensor provided in an embodiment of the present invention.

[0033] Among them, the reference numerals in the figure are:

[0034] 1: Mounting seat 11: Accommodating cavity

[0035] 12: Fixing hole 13: Limiting slot

[0036] 14: Connecting neck 15: Indentation

[0037] 2: Sensing circuit assembly 21: Pressure sensing element

[0038] 22: first electrode sheet 23: second electrode sheet

[0039] 24: Bracket 241: Mounting hole

[0040] 3: Fixed component 31: Adjustment part

[0041] 311: Recessed part 32: Force transmission part

[0042] 321: Raised part 4: Pressing plate

[0043] 5: Insulation DETAILED DESCRIPTION

[0044] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0045] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0046] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0047] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0048] Please also read Figure 1 to Figure 2A pressure sensor provided in this embodiment includes a mounting base 1 provided with a receiving cavity 11 and a plurality of fixing holes 12, a sensing circuit component 2 arranged in the receiving cavity 11, the sensing circuit component 2 having a plurality of pressure sensing elements 21, a plurality of fixing components 3 respectively arranged in the plurality of fixing holes 12 and partially inserted into the receiving cavity 11, each fixing component 3 includes an adjusting member 31 and a force transmitting member 32 formed independently of each other, one end of the force transmitting member 32 abuts against the sensing circuit component 2, and the other end abuts against the adjusting member 31, and the adjusting member 31 is fixedly connected to the mounting base 1.

[0049] The above-mentioned pressure sensor is provided with a fixing hole 12 on the mounting base 1 for fixing and connecting the fixing component 3, and the force transmission member 32 of the fixing component 3 is arranged in the accommodating cavity 11 of the mounting base 1 and abuts against the sensing circuit component 2, and the adjusting member 31 abutting against the force transmission member 32 is fixedly connected in the fixing hole 12 of the mounting base 1, so that the pre-pressure of the sensor can be independently adjusted, the load is decoupled, the horizontal component of the force applied to the pressure sensor is decomposed, and the risk of damage to the pressure sensing element 21 is reduced.

[0050] Please also read Figures 3 to 5 As a specific implementation of the pressure sensor provided in this embodiment, the pressure sensor includes a mounting base 1 provided with a receiving cavity 11 and a plurality of fixing holes 12. Openings communicating with the receiving cavity 11 are respectively formed on two opposite sides of the mounting base 1, and the receiving cavity 11 is arranged through the mounting base 1. The mounting base 1 is fixedly connected with a sensing circuit component 2 and a plurality of fixing components 3. The sensing circuit component 2 is arranged in the receiving cavity 11. The sensing circuit component 2 has a plurality of pressure sensing elements 21, which are used to measure and analyze the dynamic force of the automobile tire to calculate the total weight and partial weight of a moving vehicle, realize dynamic weighing, and transmit the measured data to the background. The plurality of fixing components 3 are respectively arranged in the plurality of fixing holes 12 and partially inserted into the receiving cavity 11. Each fixing component 3 includes an adjusting member 31 and a force transmitting member 32 formed independently of each other. One end of the force transmitting member 32 abuts against the sensing circuit component 2, and the other end abuts against the adjusting member 31; the adjusting member 31 is fixedly connected with the mounting base 1. The mounting base 1 is provided with a plurality of fixing holes 12 for fixing and connecting the fixing assembly 3. The plurality of fixing holes 12 are arranged side by side, so that the pressure sensor can independently adjust the pre-pressure of the fixing assembly 3 on each pressure sensing element 21 in the sensing circuit assembly 2, thereby realizing load decoupling. Preferably, the apertures of the plurality of fixing holes 12 on the mounting base 1 are all larger than the diameter of the force transmission member 32. During assembly, the force transmission member 32 of the fixing assembly 3 can be installed into the accommodating cavity 11 through the fixing holes 12, which is conducive to positioning the adjusting member 31 during assembly and abutting against the raised portion 321 of the force transmission member 32, making the assembly of the pressure sensor in this embodiment easier, simplifying the production process, and being conducive to improving production efficiency.

[0051] Preferably, the inner surface of the mounting base 1 located in the fixing hole 12 is provided with an internal thread, and the outer surface of the adjusting member 31 is provided with an external thread corresponding to the internal thread. The mounting base 1 is fixedly connected to the adjusting member 31 by a threaded connection, and by screwing the adjusting member 31, the pre-pressure of each pressure sensing element 21 in the sensing circuit component 2 is controlled by adjusting the fixing component 3.

[0052] Furthermore, a mounting portion is provided at the other end of the adjusting member 31 opposite to the end abutting against the force transmitting member 32. Preferably, the mounting portion provided on the adjusting member 31 is an adjustment groove formed by an indentation on the end surface of the adjusting member 31. Since the mounting portion is an adjustment groove formed by an indentation, the difficulty of adjustment is increased to ensure that the adjusting member 31 is not easily changed, so that the adjusting member 31 is not easily affected by external structures and its connection position is changed. Specific tools are required to adjust the pre-pressure of the fixing component 3 on the pressure sensing element 21 in the sensing circuit component 2.

[0053] Please also read Figure 6 to Figure 7 In this embodiment, the fixing component 3 includes an adjusting member 31 and a force transmitting member 32 abutting against the adjusting member 31. One end of the force transmitting member 32 abuts against the sensing circuit component 2, and a protruding portion 321 is convexly provided on the surface of the other end. The surface of the end where the adjusting member 31 abuts against the force transmitting member 32 is concave inward to form a concave portion 311 for partially placing the protruding portion 321. Through the abutment between the protruding portion 321 of the force transmitting member 32 and the concave portion 311 of the adjusting member 31, the horizontal component of the force applied to the pressure sensor is decomposed, thereby reducing the risk of damage to the pressure sensing element 21. Preferably, the force transmission member 32 is a stainless steel member, the raised portion 321 of the force transmission member 32 is hemispherical, and the recessed portion 311 of the adjusting member 31 is hemispherical. Through the abutment between the curved surfaces, the horizontal component of the force acting on the pressure sensor is evenly decomposed. At the same time, the wear caused by the abutment and friction between the adjusting member 31 and the force transmission member 32 of the fixed component 3 can be reduced, which is beneficial to extending the service life of the pressure sensor.

[0054] Furthermore, the pressure sensing element 21 is a quartz wafer, and the pressure sensing element 21, the force transmission member 32 and the adjustment member 31 are all coaxially arranged, so that the fixing component 3 can more effectively decompose the horizontal component of the force exerted on the dynamic weighing sensor device, and more effectively reduce the risk of damage to the pressure sensing element 21.

[0055] Please read further Figure 1In this embodiment, the pressure sensor further includes a pressing plate 4, which is fixed on the other surface of the mounting base 1 opposite to the surface connected to the fixing component 3, and can evenly distribute the pressure on the pressure sensor to the pressure sensing element 21 in the sensing circuit component 2 of each unit, and can protect the pressure sensor. The material and structure of the pressing plate 4 are not limited here. Preferably, the pressing plate 4 is a rectangular epoxy resin plate, which has the characteristics of easy processing, stable performance and wear resistance, which is conducive to improving production efficiency and extending the service life of the pressure sensor.

[0056] Please also read Figures 2 to 4 In this embodiment, the sensing circuit assembly 2 of the pressure sensor includes a first electrode sheet 22, a second electrode sheet 23, and a bracket 24 arranged between the first electrode sheet 22 and the second electrode sheet 23. A plurality of pressure sensing elements 21 are mounted on the bracket 24. The first electrode sheet 22 and the second electrode sheet 23 are both electrically connected to the plurality of pressure sensing elements 21. When the plurality of pressure sensing elements 21 of the sensing circuit assembly 2 are squeezed by external force, electrical signals are generated, and the electrical signals generated by each pressure sensing element 21 are transmitted to the background through the first electrode sheet 22 and the second electrode sheet 23 electrically connected to the plurality of pressure sensing elements 21.

[0057] Furthermore, the first electrode sheet 22 is a negative electrode sheet, the second electrode sheet 23 is a positive electrode sheet, the first electrode sheet 22 is connected in series with the negative electrodes of multiple pressure sensing elements 21, the second electrode sheet 23 is connected in series with the positive electrodes of multiple pressure sensing elements 21, and the first electrode sheet 22 and the second electrode sheet 23 are connected in parallel through multiple pressure sensing elements 21.

[0058] Furthermore, the pressure sensor also includes external wires, which are electrically connected to the first electrode sheet 22 and the second electrode sheet 23. The electrical signal emitted by the sensing circuit component 2 is transmitted to the background through the external wires, and the measurement data is displayed.

[0059] Furthermore, the bracket 24 is provided with a plurality of mounting holes 241 for mounting a plurality of pressure sensing elements 21, and the plurality of pressure sensing elements 21 are all in contact with the first electrode sheet 22 and the second electrode sheet 23. The mounting holes 241 are provided to limit the movement of the plurality of pressure sensing elements 21 on the bracket 24 relative to the bracket 24, and the mounting holes 241 on the bracket 24 make the plurality of pressure sensing elements 21 in contact with the first electrode sheet 22 and the second electrode sheet 23, thereby simplifying the structure, making it easier to assemble the pressure sensor in this embodiment, and helping to improve production efficiency.

[0060] Furthermore, the bracket 24 is an insulating bracket 24. The pressure sensing element 21 is installed by setting an insulating plastic bracket 24 to prevent the first electrode sheet 22 and the second electrode sheet 23 from being connected, thereby preventing the internal circuit of the pressure sensor from being short-circuited and affecting data output.

[0061] Furthermore, the pressure sensor further includes an insulating member 5, which is disposed between the first electrode sheet 22 and the fixing assembly 3 to prevent the electrical signal generated by the pressure sensing element 21 after being compressed from being transmitted to the fixing assembly 3, thereby affecting the accuracy of the data output. The structure and material of the insulating member 5 are not limited here. Preferably, the insulating member 5 is an insulating film to avoid occupying the internal space of the accommodating cavity 11 of the mounting seat 1, thereby improving the space utilization rate of the accommodating cavity 11.

[0062] Please also read Figures 3 to 5 In the present embodiment, the inner surface of the mounting seat 1 and the accommodating cavity 11 is recessed inward to form a limiting groove 13, and the sensing circuit component 2 is fixed in the limiting groove 13. The sensing circuit component 2 is arranged in the limiting groove 13 to prevent the sensing circuit component 2 from moving relative to the mounting seat 1, and effectively locates the position of the pressure sensing element 21 of the sensing circuit component 2 so that it is coaxially arranged with the adjusting member 31 and the force transmitting member 32 of the fixing component 3, so that the fixing component 3 can more effectively decompose the horizontal component of the force exerted on the dynamic weighing sensor device, and more effectively reduce the risk of damage to the pressure sensing element 21.

[0063] Furthermore, the mounting base 1 includes a connecting neck 14 for concentrating stress. The connecting neck 14 includes an inwardly recessed portion 15 formed on opposite sides of the mounting base 1 in a direction perpendicular to the surface of the mounting base 1 where the fixing hole 12 is formed. The recessed portions 15 are symmetrically arranged so that the stress transmitted from the pressure plate 4 to the sensing circuit component 2 is more concentrated, thereby improving the accuracy of the pressure sensor measurement.

[0064] Furthermore, the recessed portion 15 of the mounting base 1 is filled with insulating foam, which can, on the one hand, buffer part of the stress transmitted to the mounting base 1 and the sensing circuit assembly 2 by the pressure plate 4, and on the other hand, prevent water from accumulating in the recessed portion 15 of the mounting base 1 located in the shell and causing damage to the internal components of the pressure sensor, thereby helping to extend the service life of the pressure sensor.

[0065] Furthermore, the surface of the circumferential side wall of the mounting seat 1 is inwardly recessed to form at least one sealing groove. When the dynamic sensor is assembled and sealed, part of the glue will flow into the sealing groove provided on the mounting seat 1, thereby increasing the bonding area between the mounting seat 1 and other components, and effectively improving the stability of the adhesive connection. The material of the mounting seat 1 is not limited here. Preferably, the mounting seat 1 is an aluminum alloy mounting seat 1. The mounting seat 1 made of aluminum alloy has high hardness and is easy to process and produce, which effectively improves production efficiency.

[0066] The present invention also provides a pressure device, including a shell and the above-mentioned pressure sensor arranged in the shell. The pressure device can independently adjust the pre-pressure of the sensor to achieve load decoupling; through the abutment between the raised portion 321 of the force transmission member 32 and the recessed portion 311 of the adjustment member 31, the horizontal component of the force exerted on the dynamic weighing sensor device is decomposed, thereby reducing the risk of damage to the pressure sensing element 21.

[0067] The above description is only a preferred embodiment of the present embodiment and is not intended to limit the present embodiment. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present embodiment shall be included in the protection scope of the present embodiment.

Claims

1. A pressure sensor, characterized in that: include: A mounting seat, provided with a receiving cavity and a plurality of fixing holes; A sensing circuit assembly is disposed in the accommodating cavity, wherein the sensing circuit assembly has a plurality of pressure sensing elements; A plurality of fixing components are respectively disposed in the plurality of fixing holes and partially placed in the accommodating cavity; Each of the fixing components comprises an adjusting member and a force transmitting member which are independently formed from each other, one end of the force transmitting member abuts against the sensing circuit component, and the other end abuts against the adjusting member; the adjusting member is fixedly connected to the mounting seat; The surface of one end where the force transmitting member abuts against the adjusting member is convexly provided with a raised portion, and the surface of one end where the adjusting member abuts against the force transmitting member is concave inwardly to form a recessed portion for the raised portion to be placed in. The raised portion of the force transmitting member is hemispherical, and the recessed portion of the adjusting member is hemispherical. The contact mode between the force transmitting member and the adjusting member is the abutment between curved surfaces that can decompose the component force in the horizontal direction of the force applied to the pressure sensor.

2. The pressure sensor according to claim 1, characterized in that: The inner surface of the mounting seat located at the accommodating cavity is recessed inward to form a limiting groove, and the sensing circuit component is fixed in the limiting groove.

3. The pressure sensor according to claim 1, wherein: The inner surface of the mounting seat located at the fixing hole is provided with an internal thread, and the outer surface of the adjusting member is provided with an external thread corresponding to the internal thread.

4. The pressure sensor according to claim 1, wherein: The pressure sensor further includes a pressing plate fixed to another surface of the mounting base opposite to the surface to which the fixing component is connected.

5. The pressure sensor according to claim 1, wherein: The sensing circuit assembly includes a first electrode sheet, a second electrode sheet, and a bracket arranged between the first electrode sheet and the second electrode sheet, and a plurality of the pressure sensing elements are mounted on the bracket. The first electrode sheet and the second electrode sheet are both electrically connected to the plurality of the pressure sensing elements.

6. The pressure sensor according to claim 5, characterized in that: The bracket is provided with a plurality of mounting holes for mounting a plurality of the pressure sensing elements, and the plurality of the pressure sensing elements are all in contact with the first electrode sheet and the second electrode sheet.

7. The pressure sensor according to claim 5, characterized in that: The pressure sensing element is a quartz wafer, and the pressure sensing element, the force transmission element and the adjustment element are all coaxially arranged.

8. The pressure sensor according to claim 5, characterized in that: The pressure sensor further includes an insulating member, and the insulating member is disposed between the first electrode sheet and the fixing assembly.

9. The pressure sensor according to claim 5, characterized in that: The bracket is an insulating bracket.

10. The pressure sensor according to claim 1, wherein: The force transmission part is a stainless steel part.

11. The pressure sensor according to claim 1, wherein: The mounting seat includes a connecting neck for concentrating stress, and the connecting neck includes an inwardly recessed portion formed on opposite sides of the mounting seat in a direction perpendicular to the surface of the mounting seat where the fixing hole is formed, and the recessed portion is symmetrically arranged and filled with insulating foam.

12. A pressure device, characterized in that: The invention comprises a housing and a pressure sensor as claimed in any one of claims 1 to 11 arranged in the housing.

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