Pressure sensing device and pressure sensing system

Abstract

The invention relates to a pressure sensing device and a pressure sensing system, and the device comprises an elastic seat which is provided with a plurality of interval grooves, the center lines of the interval grooves are parallel to each other, the interval grooves penetrate through the side wall of the elastic seat, the elastic seat comprises a pressure-bearing end, and the pressure-bearing end is connected with the pressure-bearing end. The center lines of the interval grooves are parallel to the plane where the end face of the pressure-bearing end is located, and the lengths of the multiple interval grooves are gradually reduced from the pressure-bearing end to the direction away from the pressure-bearing end. The detection piece is located in the interval groove and abuts against the side walls of the opposite sides of the interval groove, and the detection piece is used for detecting the distance between the side walls of the opposite sides of the interval groove. According to the pressure sensing device and the pressure sensing system, high-precision detection can be carried out on small force under the condition that the measuring range is large.

Description

Technical Field

[0001] The present invention relates to the technical field of sensor devices, and in particular to a pressure sensor device and a pressure sensor system. Background Art

[0002] Pressure sensors are the most commonly used sensors in industrial practice. Pressure sensors are used to convert pressure signals into corresponding electrical signals. Currently, common pressure sensors use a single pressure sensitive element to detect the magnitude of pressure. When performing pressure tests, it is usually necessary to perform high-precision detection of smaller forces, and also to detect larger forces. Since large-range pressure sensors are not accurate, and high-precision pressure sensors have a small range, the pressure sensor's detection of force is limited. During pressure testing, the pressure sensor needs to be replaced multiple times according to the test content, resulting in low efficiency of the pressure test. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present invention is to provide a pressure sensing device and a pressure sensing system, which can perform high-precision detection of smaller forces under a larger measuring range.

[0004] In order to solve the above technical problems, the present invention provides a pressure sensing device, including: an elastic seat, a plurality of spacing grooves are provided on the elastic seat, the center lines of the spacing grooves are parallel to each other, and the spacing grooves pass through the side walls of the elastic seat, the elastic seat includes a pressure-bearing end, the center line of the spacing groove is parallel to the plane where the end face of the pressure-bearing end is located, and the lengths of the plurality of spacing grooves gradually decrease from the pressure-bearing end to the direction away from the pressure-bearing end; a detection member, located in the spacing groove and abutting against the side wall on the opposite side of the spacing groove, the detection member being used to detect the distance between the side walls on the opposite sides of the spacing groove.

[0005] In one embodiment of the present invention, the elastic seat is cylindrical, and a separation groove is further provided on the elastic seat, the center line of the separation groove is parallel to the center line of the elastic seat, and one end of a plurality of the separation grooves is connected to the separation groove.

[0006] In one embodiment of the present invention, at least one side wall of the spacing groove communicating with the dividing groove is further connected to a first pressure-bearing block.

[0007] In one embodiment of the present invention, the diameter of the first pressure block gradually decreases from the side wall of the spacing groove to the direction away from the side wall of the spacing groove.

[0008] In one embodiment of the present invention, at least one side wall of the spacing groove is provided with a clamping groove, the detection member is clamped with the clamping groove, and the first pressure block is located between the clamping groove and the separation groove.

[0009] In one embodiment of the present invention, the pressure-bearing end of the elastic seat is further provided with a pressure-bearing platform, and the pressure-bearing platform is arranged along the spacing groove.

[0010] In one embodiment of the present invention, the length of the pressure platform is shorter than the length of the shortest spacing groove among the plurality of spacing grooves.

[0011] In one embodiment of the present invention, a second pressure block is provided on the pressure platform at a position close to the end of the separation groove.

[0012] In one embodiment of the present invention, one end of the pressure platform is located at an edge of the separation groove.

[0013] The present invention further provides a pressure sensing system, comprising the pressure sensing device described above, and also comprising a controller, wherein the detection element of the pressure sensing device is connected to the controller.

[0014] The above technical solution of the present invention has the following advantages compared with the prior art:

[0015] A pressure sensing device described in the present invention is configured such that the lengths of multiple spacing grooves gradually decrease from the pressure-bearing end to the direction away from the pressure-bearing end, so that the force required for the two first pressure-bearing blocks in the spacing groove close to the pressure-bearing end to offset each other is smaller, and the force required for the two first pressure-bearing blocks in the spacing groove away from the pressure-bearing end to offset each other is larger, thereby enabling the detection component in the spacing groove close to the pressure-bearing end to accurately detect smaller forces, and the detection component in the spacing groove away from the pressure-bearing end to detect forces with a larger range, thereby performing high-precision detection of smaller forces under the condition of a larger range. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0017] Figure 1 It is a structural schematic diagram of a pressure sensing device of the present invention;

[0018] Figure 2 yes Figure 1 A schematic diagram of the structure from another angle;

[0019] Figure 3 yes Figure 1 Schematic diagram of some structures;

[0020] Figure 4 yes Figure 3 A partial enlarged view of point A in the middle.

[0021] Explanation of the reference numerals in the drawings in the specification: 1. elastic seat; 2. detection member; 3. first pressure-bearing block; 4. second pressure-bearing block; 11. first spacing groove; 12. second spacing groove; 13. third spacing groove; 14. fourth spacing groove; 15. separation groove; 16. slot; 17. pressure-bearing platform. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0023] Embodiment 1

[0024] Reference Figure 1 and Figure 2 As shown, a pressure sensing device of the present invention comprises: an elastic seat 1, wherein a plurality of spacing grooves are provided on the elastic seat 1, wherein the center lines of the spacing grooves are parallel to each other, and the spacing grooves penetrate the side wall of the elastic seat 1, and the elastic seat 1 comprises a pressure-bearing end, wherein the center line of the spacing grooves is parallel to the plane where the end face of the pressure-bearing end is located, and the lengths of the plurality of spacing grooves gradually decrease from the pressure-bearing end to a direction away from the pressure-bearing end; and a detection member 2, located in the spacing grooves and abutting against the side wall on the opposite side of the spacing grooves, and wherein the detection member 2 is used to detect the distance between the side walls on the opposite sides of the spacing grooves.

[0025] In a pressure sensing device of the present embodiment, since the lengths of the plurality of spacing grooves gradually decrease from the pressure-bearing end to the direction away from the pressure-bearing end, the force required to make the opposite sides of the spacing grooves close to the pressure-bearing end abut against each other is the smallest, and the force required to make the opposite sides of the spacing grooves abut against each other as the distance from the pressure-bearing end increases. By applying pressure to the pressure-bearing end of the elastic seat 1, when the pressure is small, the detection member 2 in the spacing groove close to the pressure-bearing end can perform high-precision detection of a smaller force. When the pressure is large, the opposite sides of the plurality of spacing grooves abut against each other so that the plurality of detection members 2 can jointly detect a larger force, thereby performing high-precision detection of a smaller force under a large measuring range.

[0026] The elastic seat 1 is used to convert the external pressure into the width change of the spacing groove. The elastic seat 1 is made of a material that can be elastically deformed, such as nylon. In this embodiment, the elastic seat 1 is in the shape of a cylinder with a circular ring cross section. According to different ranges and precisions, the elastic seat 1 can also be in the shape of a solid cylinder, a prism, or a cylinder with a triangular, square, etc. cross section. The elastic seat 1 is provided with a plurality of spacing grooves arranged along the circumference of the elastic seat 1. The widths of the plurality of spacing grooves are equal. The width is the size of the spacing groove along the axial direction of the elastic seat 1, and is also the distance between the side walls of the opposite sides of the spacing groove. The center lines of the plurality of spacing grooves are parallel to each other along the axial direction of the elastic seat 1. The spacing grooves penetrate the side walls of the elastic seat 1, so that the spacing grooves are hollow.

[0027] The elastic seat 1 includes a pressure-bearing end, which is located at the open end of the elastic seat 1. The center line of the spacing groove is parallel to the plane where the pressure-bearing end is located, so that the force borne by the pressure-bearing end can be quasi-converted into the width change of the spacing groove. In this embodiment, the multiple spacing grooves include a first spacing groove 11, a second spacing groove 12, a third spacing groove 13 and a fourth spacing groove 14. Different numbers of spacing grooves can be set according to different measuring ranges, and the first spacing groove 11 is closest to the pressure-bearing end. The length of the multiple spacing grooves gradually decreases from the pressure-bearing end to the direction away from the pressure-bearing end, that is, the lengths of the first spacing groove 11, the second spacing groove 12, the third spacing groove 13 and the fourth spacing groove 14 decrease successively, and the length of the spacing groove is the length of the spacing groove extending along the circumference of the elastic seat 1.

[0028] The elastic seat 1 is also provided with a partition groove 15, the center line of which is parallel to the center axis of the elastic seat 1, and one end of a plurality of partition grooves is connected to the partition groove 15, that is, one end of the first partition groove 11, the second partition groove 12, the third partition groove 13 and the fourth partition groove 14 are all connected to the partition groove 15. One end of the partition groove 15 passes through the open end of the elastic seat 1. Preferably, the first partition groove 11, the second partition groove 12, the third partition groove 13 and the fourth partition groove 14 are aligned along the axial direction of the elastic seat 1, that is, the first partition groove 11, the second partition groove 12, the third partition groove 13 and the fourth partition groove 14 are extended from the partition groove 15 along the side wall of the elastic seat 1.

[0029] One end of the spacing groove connected to the dividing groove 15 is the width change end of the spacing groove. The side wall of at least one side of the width change end of the spacing groove is also connected to the first pressure block 3. In this embodiment, the opposite sides of the spacing groove are all connected to the first pressure block 3. The diameter of the first pressure block 3 gradually decreases from the side wall of the spacing groove to the side wall away from the spacing groove, so that the first pressure block 3 is tapered as a whole. When the two first pressure blocks 3 are against each other, the width of the spacing groove reaches the minimum value.

[0030] Reference Figure 3 and Figure 4 As shown, the detection member 2 is used to detect the distance between the side walls on opposite sides of the spacing groove, that is, the detection member 2 is used to detect the width of the spacing groove. The detection member 2 is located in the spacing groove and abuts against the side wall on the opposite side of the spacing groove. The detection member 2 is made of ultra-thin strain sensitive material, for example, a flexible piezoresistive material with a thin thickness, a flexible piezoelectric material such as a PVDF film, etc. A card slot 16 is provided on at least one side wall of the spacing groove, and the detection member 2 is engaged with the card slot 16, so that the position of the detection member 2 is fixed. In this embodiment, the card slot 16 is located at a position close to the first pressure block 3, and the first pressure block 3 is located between the card slot 16 and the dividing groove 15. Card slots 16 are provided on the opposite sides of the spacing groove, and the two ends of the detection member 2 are respectively abutted against the bottom of the spacing groove, so that the detection member 2 can accurately detect the distance between the spacing grooves.

[0031] The pressure-bearing end of the elastic seat 1 is also provided with a pressure-bearing platform 17, which is arranged along the spacing groove, that is, the pressure-bearing platform 17 is arranged circumferentially at the end of the elastic seat 1. The length of the pressure-bearing platform 17 is less than the length of the shortest spacing groove among the multiple spacing grooves. In this embodiment, the length of the pressure-bearing platform 17 is less than the length of the fourth spacing groove 14. A second pressure-bearing block 4 is provided at a position close to the end of the separation groove 15 on the pressure-bearing platform 17, and the second pressure-bearing block 4 is cylindrical. One end of the pressure-bearing platform 17 is located at the edge of the separation groove 15 and is aligned with one end of the multiple separation grooves connected to the separation groove 15 along the axial direction of the elastic seat 1. The second pressure-bearing block 4 is located at a position close to the separation groove 15, so that the second pressure-bearing block 4 corresponds to the width change end of the separation groove. During the pressure test, when the external pressure application area is large, the pressure application surface and the pressure-bearing platform 17 are against each other, so that the pressure applied by the pressure application surface corresponds to the spacing groove in the axial direction of the elastic seat 1, preventing the pressure application surface from applying force to a position outside the spacing groove, thereby improving the accuracy of pressure detection. When the pressure-applying area is small, the pressure-applying surface abuts against the second pressure-bearing block 4, so that the pressure can accurately correspond to the width variation end of the spacing groove, thereby further improving the detection accuracy.

[0032] Since the lengths of the multiple spacing grooves gradually decrease from the pressure-bearing end to the direction away from the pressure-bearing end, the length of the first spacing groove 11 is the longest, and the force required for the two first pressure blocks 3 in the first spacing groove 11 to offset each other is the smallest, thereby making the force required for the first spacing groove 11 to change the unit distance of width the smallest, and the force that can be detected by the first spacing groove 11 is the smallest, with the highest accuracy. The length of the fourth spacing groove 14 is the shortest, and the force required for the two first pressure blocks 3 in the fourth spacing groove 14 to offset each other is the largest, thereby making the force required for the fourth spacing groove 14 to change the unit distance of width the largest, and the force that can be detected by the fourth spacing groove 14 is the largest, with the lowest accuracy. That is, the force detection accuracy gradually decreases from the first spacing groove 11 to the fourth spacing groove 14, but the force detection range gradually increases from the first spacing groove 11 to the fourth spacing groove 14.

[0033] When in use, for example, the force used for detection by the detection member 2 in the first spacing groove 11 is 0-1N, the force used for detection by the detection member 2 in the first spacing groove 11 and the second spacing groove 12 is 0-10N, the force used for detection by the detection member 2 in the first spacing groove 11, the second spacing groove 12 and the third spacing groove 13 is 0-50N, and the force used for detection by the detection member 2 in the first spacing groove 11, the second spacing groove 12, the third spacing groove 13 and the fourth spacing groove 14 is 0-100N. When the detected force is less than 1N, only the width of the first spacing groove 11 changes, and the detection member 2 in the first spacing groove 11 detects the size of the applied pressure through the change in the width of the first spacing groove 11, and high-precision detection can be performed. When the detected force is 50-100N, the two first pressure blocks 3 in the first spacing groove 11, the second spacing groove 12 and the third spacing groove 13 are all offset, and the pressure size of the pressure is obtained through the cooperation of the detection members 2 in the four spacing grooves. The detection range of the detection member 2 in the above-mentioned spacing groove is only used as an example. The detection member 2 and the spacing groove width of different ranges can be set according to the magnitude of the measuring force.

[0034] Embodiment 2

[0035] The present invention also provides a pressure sensing system, including the pressure sensing device in the first embodiment, and also including a controller. The detection component 2 of the pressure sensing device is connected to the controller, and the controller can receive the pressure signal of the detection component 2, so as to achieve the purpose of detecting the pressure size.

[0036] A pressure sensing device and a pressure sensing system of the present invention are arranged such that the lengths of a plurality of spacing grooves gradually decrease from the pressure-bearing end to the direction away from the pressure-bearing end, so that the force required for the two first pressure-bearing blocks 3 in the spacing grooves close to the pressure-bearing end to offset each other is smaller, and the force required for the two first pressure-bearing blocks 3 in the spacing grooves away from the pressure-bearing end to offset each other is larger, thereby enabling the detection member 2 in the spacing grooves close to the pressure-bearing end to accurately detect smaller forces, and the detection member 2 in the spacing grooves away from the pressure-bearing end to detect forces with a larger range, thereby performing high-precision detection of smaller forces under the condition of a larger range, thereby improving the pressure test efficiency.

[0037] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from them are still within the protection scope of the invention.

Claims

1. A pressure sensing device, characterized in that: include: An elastic seat, wherein a plurality of spacing grooves are provided on the elastic seat, the center lines of the spacing grooves are parallel to each other, and the spacing grooves penetrate the side wall of the elastic seat, the elastic seat comprises a pressure-bearing end, the center line of the spacing grooves is parallel to the plane where the end surface of the pressure-bearing end is located, and the lengths of the plurality of spacing grooves gradually decrease from the pressure-bearing end to a direction away from the pressure-bearing end; The detection member is located in the spacing groove and abuts against the side wall on the opposite side of the spacing groove. The detection member is used to detect the distance between the side walls on the opposite side of the spacing groove.

2. The pressure sensing device according to claim 1, characterized in that: The elastic seat is cylindrical, and a separation groove is further provided on the elastic seat. The center line of the separation groove is parallel to the center line of the elastic seat, and one end of a plurality of the separation grooves is connected to the separation groove.

3. The pressure sensing device according to claim 2, characterized in that: At least one side wall of the spacing groove communicating with the dividing groove is further connected with a first pressure bearing block.

4. The pressure sensing device according to claim 3, characterized in that: The diameter of the first pressure-bearing block gradually decreases from the side wall of the spacing groove to the direction away from the side wall of the spacing groove.

5. The pressure sensing device according to claim 3, characterized in that: At least one side wall of the spacing groove is provided with a clamping groove, the detection member is clamped with the clamping groove, and the first pressure bearing block is located between the clamping groove and the separation groove.

6. The pressure sensing device according to claim 2, characterized in that: The pressure-bearing end of the elastic seat is also provided with a pressure-bearing platform, and the pressure-bearing platform is arranged along the spacing groove.

7. The pressure sensing device according to claim 6, characterized in that: The length of the pressure platform is shorter than the length of the shortest spacing groove among the plurality of spacing grooves.

8. The pressure sensing device according to claim 6, characterized in that: A second pressure block is disposed on the pressure platform at a position close to the end of the separation groove.

9. The pressure sensing device according to claim 8, characterized in that: One end of the pressure bearing platform is located at the edge of the separation groove.

10. A pressure sensing system, comprising the pressure sensing device according to any one of claims 1 to 9, and further comprising a controller, wherein the detection element of the pressure sensing device is connected to the controller.

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