Pressure sensor

Abstract

The utility model provides a pressure sensor. The pressure sensor comprises a housing, a stress pressure head movably installed on the housing, and an elastic assembly and an induction assembly which are installed in the housing. The stress pressure head comprises a pressing part, a movable part and a boss part; the pressing part extends out of the shell, and the movable part is accommodated in the shell; the boss part is used for abutting against the elastic assembly. The sensing assembly comprises a distance sensor and a sensing sheet; the distance sensor is installed in the shell, the induction piece is installed on the lower surface of the boss part, and the induction piece is located over the distance sensor. The elastic assembly comprises a plurality of elastic pieces, each elastic piece is arranged on the movable part in a sleeving mode, one elastic piece abuts against the boss part, every two adjacent elastic pieces abut against each other, and each elastic piece is provided with an open groove. The pressure sensor provided by the utility model can accurately measure the pressure value through the deformation quantity of the elastic sheet according to the pressure, and the pressure test precision is high.

Description

Technical Field

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

[0002] Traditional pressure sensors use the piezoelectric effect, with a pressure-sensitive component called a piezoresistor. When pressure is applied, the piezoresistor changes, causing its resistance to change. The pressure sensor then outputs an electrical signal, which is used to calculate the pressure.

[0003] However, traditional pressure sensors, when used in pressure heads to press things down, have a very small allowable deformation. Even a 0.01mm or 0.02mm downward movement along the Z-axis can cause a significant change in pressure. This is especially true for traditional pressure sensors with large ranges (e.g., 5T and 10T), where the resulting pressure changes are even greater, making them unsuitable for pressure control applications. Utility Model Content

[0004] This invention provides a pressure sensor that can reduce the pressure change by amplifying the allowable deformation of the spring according to the pressure magnitude, which is beneficial for pressure control and effectively improves the accuracy of pressure testing.

[0005] The technical solution adopted by this utility model is as follows: a pressure sensor, comprising: a housing, a pressure head, an elastic component, and a sensing component; the pressure head is movably installed in the housing, and the elastic component and the sensing component are both installed inside the housing;

[0006] The pressure head includes a pressing part, a movable part connected to the pressing part, and a boss part connected between the pressing part and the movable part; the pressing part extends out of the outer shell, and the movable part is housed within the outer shell;

[0007] The sensing component includes a distance sensor and a sensing element; the distance sensor is installed inside the housing, the sensing element is installed on the lower surface of the protrusion, and the sensing element is located above the distance sensor;

[0008] The elastic component includes a first spring, a second spring, and a third spring. The first spring abuts against the protrusion, and the second spring is disposed above the first spring.

[0009] Furthermore, the first spring piece is provided with a through hole for the movable part to pass through, and multiple slots are provided radially outward from the position near the through hole; or the first spring piece is provided with spiral slots surrounding the outer periphery of the through hole; or the first spring piece is provided with multiple arc-shaped slots surrounding the outer periphery of the through hole.

[0010] Furthermore, the second spring has a through hole through which the movable part passes, and multiple slots are radially arranged from near the through hole outward in a circumferential direction; or the second spring has spiral slots surrounding the outer periphery of the through hole; or the second spring has multiple arc-shaped slots surrounding the outer periphery of the through hole.

[0011] Furthermore, the third spring sheet is provided with a through hole for the movable part to pass through, and multiple slots are provided radially outward from the position near the through hole; or the third spring sheet is provided with spiral slots surrounding the outer periphery of the through hole; or the third spring sheet is provided with multiple arc-shaped slots surrounding the outer periphery of the through hole.

[0012] Furthermore, the thickness of the first spring is less than the thickness of the second spring, and the thickness of the second spring is less than the thickness of the third spring.

[0013] Furthermore, the outer casing includes an upper casing and a lower casing, the pressing portion extends downward from the lower casing, and the movable portion is housed within the upper casing.

[0014] Furthermore, a first spacer ring is sandwiched between the first spring and the lower housing, a second spacer ring is sandwiched between the first spring and the second spring, and a third spacer ring is sandwiched between the second spring and the third spring.

[0015] Furthermore, the lower housing is provided with a fixing part, and the boss part is provided with a locking hole. A locking rod is used in the locking hole to lock the force-receiving head to the fixing part; and the diameter of the locking hole is larger than the diameter of the locking rod.

[0016] Furthermore, the upper housing is provided with a receiving space to accommodate the lifting and lowering movement of the movable part.

[0017] Furthermore, the distance sensor is connected to a connecting wire that extends out of the upper housing and the lower housing.

[0018] Compared to existing technologies, the pressure sensor of this invention features multiple slots on each spring piece, allowing each spring piece to deform more significantly under the same pressure compared to traditional pressure sensors. This effectively amplifies the allowable deformation of the spring pieces, reducing pressure variations and facilitating pressure control. Furthermore, the deformation of each spring piece corresponds to the pressure applied to the pressure head, enabling accurate measurement of pressure values ​​through the spring piece deformation, thus significantly improving pressure testing accuracy. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but should not be construed as limiting the present invention. In the drawings,

[0020] Figure 1 : A three-dimensional assembly diagram of the pressure sensor of this utility model;

[0021] Figure 2 : An exploded perspective view of the pressure sensor of this utility model;

[0022] Figure 3 : A cross-sectional view of the pressure sensor of this utility model;

[0023] Figure 4 : A perspective view of the first embodiment of the spring clip of this utility model;

[0024] Figure 5 : A perspective view of the second embodiment of the first spring clip of this utility model;

[0025] Figure 6 : A perspective view of the third embodiment of the first spring of this utility model.

[0026] Figure label:

[0027] 1. Outer shell; 101. Upper shell; 102. Lower shell; 103. Fixing part; 2. Accommodating space; 3. Force-receiving pressure head; 301. Pressing part; 302. Movable part; 303. Boss part; 4. Locking hole; 5. Locking rod; 6. Distance sensor; 7. Sensing plate; 8. Connecting wire; 9. First spring; 10. Second spring; 11. Third spring; 12. Through hole; 13. Slot; 14. First spacer ring; 15. Second spacer ring; 16. Third spacer ring; 17. Connecting hole. Detailed Implementation

[0028] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0029] Example 1

[0030] like Figures 1 to 3 As shown, the pressure sensor of this utility model includes a housing 1, a pressure head 3 movably mounted on the housing 1, an elastic component mounted inside the housing 1 and pressed by the pressure head 3, and a sensing component mounted inside the housing 1 to sense the displacement of the pressure head 3.

[0031] Specifically, the outer casing 1 includes an upper casing 101 and a lower casing 102. The pressure head 3 is movably installed within the space formed by the upper casing 101 and the lower casing 102, and the pressure head 3 extends at least partially beyond the lower casing 102. The pressure head 3 includes a pressing part 301, a movable part 302 connected to the pressing part 301, and a boss part 303 connected between the pressing part 301 and the movable part 302; wherein the pressing part 301 extends beyond the lower casing 102, the movable part 302 is housed within the upper casing 101, and the boss part 303 is used to press against the elastic component.

[0032] Furthermore, the lower housing 102 is provided with a fixing part 103, and the boss part 303 is provided with a locking hole 4. A locking rod 5 is used to lock the pressure head 3 to the fixing part 103 through the locking hole 4. The diameter of the locking hole 4 is larger than the diameter of the locking rod 5, so that there is a gap between the locking hole 4 and the locking rod 5. This effectively prevents the pressure head 3 from rotating after being subjected to force, and also serves as a guide for the lifting and lowering of the pressure head 3, so that the lifting and lowering of the pressure head 3 is unrestricted.

[0033] When the pressing part 301 is subjected to external pressure, the boss part 303 will press against the elastic component, causing the elastic component to deform, and the moving part 302 will move within the upper housing 101.

[0034] like Figures 2 to 4 As shown, the sensing assembly includes a distance sensor 6 and a sensing element 7; wherein, the distance sensor 6 is installed inside the lower housing 102, and the distance sensor 6 is connected to a connecting line 8, which extends out of the upper housing 101 and the lower housing 102. The sensing element 7 is installed on the lower surface of the boss portion 303, and the sensing element 7 is located directly above the distance sensor 6.

[0035] The elastic component includes a first spring piece 9, a second spring piece 10, and a third spring piece 11. The first spring piece 9, the second spring piece 10, and the third spring piece 11 are all sleeved on the movable part 302, and the first spring piece 9 abuts against the boss part 303. The second spring piece 10 is located above the first spring piece 9, and the third spring piece 11 is located above the second spring piece 10.

[0036] In a preferred embodiment, the elastic component may further include two or more spring pieces, and the number of spring pieces may be set according to the actual application and is not limited thereto.

[0037] In this embodiment, both the first spring 9 and the second spring 10 are circular springs; it is understood that in other embodiments, the first spring 9 and the second spring 10 can also be adjusted according to the appearance shape of the pressure sensor, as long as they are compatible with the pressure sensor, and are not limited thereto.

[0038] The pressure detection principle of this utility model is as follows:

[0039] When the pressing part 301 is subjected to force, the protrusion part 303 presses against the first spring piece 9, the first spring piece 9 deforms, and the protrusion part 303 drives the sensing piece 7 to move, causing the distance between the sensing piece 7 and the distance sensor 6 to change. The distance change is measured by the distance sensor 6, which is the deformation. By monitoring the deformation, the pressure on the pressing head 3 can be calculated.

[0040] When the deformation of the first spring 9 reaches a certain level, it will contact the second spring 10. When the pressing part 301 is subjected to greater pressure, the second spring 10 deforms, and the boss part 303 drives the sensing plate 7 to move, causing the distance between the sensing plate 7 and the distance sensor 6 to change. The distance sensor 6 measures the distance change, which is the deformation. By monitoring the deformation, the magnitude of the pressure on the pressure head 3 is calculated.

[0041] When the deformation of the second spring 10 reaches a certain level, it will contact the third spring 11. When the pressing part 301 is subjected to greater pressure, the third spring 11 will deform. Similarly, the boss part 303 drives the sensing plate 7 to move, causing the distance between the sensing plate 7 and the distance sensor 6 to change. The distance change measured by the distance sensor 6 is the deformation. By monitoring the deformation, the pressure on the pressure head 3 is calculated. In this process, the first spring 9, the second spring 10 and the third spring 11 correspond to different force measurement ranges.

[0042] like Figure 4 As shown, in this embodiment, the first spring sheet 9 has a through hole 12 in the middle for the movable part 302 to pass through. Multiple slots 13 are radially arranged from the position near the through hole 12 outward in the circumferential direction. This allows the first spring sheet 9 to produce a larger deformation under the same pressure compared with traditional pressure sensors, effectively amplifying the allowable deformation of the spring sheet and reducing the pressure change, which is beneficial for pressure control. At the same time, the deformation of the first spring sheet 9 corresponds to the magnitude of the pressure on the pressure head 3.

[0043] Example 2

[0044] like Figure 5 As shown, the same structure as in Embodiment 1 will not be repeated here. The difference is that in this embodiment, the first spring 9 has a spiral (mosquito coil) groove 13, which surrounds the outer periphery of the through hole 12. This allows the first spring 9 to produce a larger deformation under the same pressure compared to traditional pressure sensors, effectively amplifying the allowable deformation of the spring and reducing the pressure change, which is beneficial for pressure control. At the same time, the deformation of the first spring 9 corresponds to the magnitude of the pressure on the pressure head 3.

[0045] Example 3

[0046] like Figure 6 As shown, the same structure as in Embodiment 1 will not be repeated here. The difference is that in this embodiment, the first spring 9 forms multiple arc-shaped slots 13. The multiple arc-shaped slots 13 can be staggered or arranged end to end to surround the outer periphery of the through hole 12, and are not limited thereto.

[0047] In a preferred embodiment, the structure and shape of the second spring 10 and the third spring 11 are the same as those of the first spring 9, and will not be described again here. The difference is that the thickness of the first spring 9 is less than the thickness of the second spring 10, and the thickness of the second spring 10 is less than the thickness of the third spring 11; wherein the thickness of the first spring 9 is 1.5-2.0 mm, and the thickness of the second spring 10 is 3.5-4.0 mm. It is understood that in other embodiments, the first spring 9, the second spring 10, and the third spring 11 may be configured with different structures. Furthermore, the thicknesses of the first spring 9, the second spring 10, and the third spring 11 can be calibrated and calculated according to each pressure sensor, and are not limited thereto.

[0048] Since the accuracy of a sensor is essentially the magnitude of the force applied divided by the deformation of the spring, theoretically, under the same force, the greater the deformation of the spring, the higher the accuracy. Therefore, by radially arranging multiple slots 13 from the central through-hole 12 outwards in the first spring 9, second spring 10, and third spring 11, compared to traditional pressure sensors, the first spring 9, second spring 10, and third spring 11 can produce greater deformation under the same pressure, effectively amplifying the allowable deformation of the springs, reducing the pressure variation, which is beneficial for pressure control and improves the detection accuracy of the pressure sensor.

[0049] Furthermore, a first spacer ring 14 is sandwiched between the first spring piece 9 and the lower housing 102, a second spacer ring 15 is sandwiched between the first spring piece 9 and the second spring piece 10, and a third spacer ring 16 is sandwiched between the second spring piece 10 and the third spring piece 11. The first spacer ring 14, the second spacer ring 15, and the third spacer ring 16 are provided to press the first spring piece 9, the second spring piece 10, and the third spring piece 11 together.

[0050] In addition, the upper housing 101 is provided with a receiving space 2 to accommodate the lifting and lowering movement of the movable part 302; and the upper housing 101 is also provided with a connecting hole 17 in the middle for connecting with other mechanisms.

[0051] The working principle of the pressure sensor of this utility model is as follows:

[0052] When the pressure head 3 (pressing part 301) is subjected to force, the boss part 303 presses the first spring piece 9, causing the first spring piece 9 to undergo elastic deformation, and the pressure head 3 to be displaced. The distance sensor 6 detects the change in distance of the sensing piece 7 installed on the boss part 303, which is the deformation. By monitoring the deformation, the pressure head 3 can be calculated.

[0053] When the deformation of the first spring 9 reaches a certain level, it will contact the second spring 10. When the pressing part 301 is subjected to greater pressure, the second spring 10 will deform. Similarly, the distance sensor 6 detects the distance change of the safety sensor 7, which is the deformation. By monitoring the deformation, the pressure on the pressure head 3 is calculated.

[0054] When the deformation of the second spring 10 reaches a certain level, it will contact the third spring 11. When the pressing part 301 is subjected to greater pressure, the third spring 11 will deform. Similarly, the boss part 303 will drive the sensing plate 7 to move, causing the distance between the sensing plate 7 and the distance sensor 6 to change. The distance change measured by the distance sensor 6 is the deformation. By monitoring the deformation, the pressure on the pressure head 3 can be calculated.

[0055] Therefore, the first spring 9, the second spring 10, and the third spring 11 correspond to different force measurement ranges, further improving the detection accuracy of the pressure sensor.

[0056] In summary, the pressure sensor of this invention has the following advantages:

[0057] 1. By setting multiple slots 13 from the central through hole 12 outward in the circumferential direction in the first spring 9, the second spring 10 and the third spring 11, the first spring 9 and the second spring 10 can produce greater deformation under the same pressure compared with traditional pressure sensors, thereby improving the detection accuracy of the pressure sensor.

[0058] 2. By setting the second spring 10 and the third spring 11, when the deformation of the first spring 9 reaches a certain level, it will contact the second spring 10, and the second spring 10 requires a greater force to deform; when the deformation of the second spring 10 reaches a certain level, it will contact the third spring 11, and the third spring 11 requires a greater force to deform. The first spring 9, the second spring 10 and the third spring 11 correspond to different force measurement ranges, further improving the detection accuracy of the pressure sensor.

[0059] 3. By setting the locking rod 5 to pass through the locking hole 4, the pressure head 3 and the fixing part 103 are locked. The diameter of the locking hole 4 is larger than the diameter of the locking rod 5, so that there is a gap between the locking hole 4 and the locking rod 5. This effectively prevents the pressure head 3 from rotating after being subjected to force, and also serves as a guide for the lifting and lowering of the pressure head 3, so that the lifting and lowering of the pressure head 3 is not restricted.

[0060] Any combination of different embodiments of this utility model, provided it does not violate the inventive concept of this utility model, shall be considered as the disclosure of this utility model; any simple modifications to the technical solution and any combination of different embodiments within the scope of the inventive concept of this utility model, without violating the inventive concept of this utility model, shall be within the protection scope of this utility model.

Claims

1. A pressure sensor, characterized by, The utility model relates to a distance sensor, which comprises a shell, a force pressure head, an elastic component and an induction component, the force pressure head is movably installed in the shell, and the elastic component and the induction component are installed in the shell. The force pressure head comprises a pressing part, a movable part connected with the pressing part and a boss part connected between the pressing part and the movable part, the pressing part extends out of the shell, and the movable part is accommodated in the shell. The induction component comprises a distance sensor and an induction sheet, the distance sensor is installed in the shell, the induction sheet is installed on the lower surface of the boss part, and the induction sheet is located above the distance sensor. The elastic component comprises a first elastic sheet, a second elastic sheet and a third elastic sheet, the first elastic sheet abuts against the boss part, the second elastic sheet is arranged above the first elastic sheet, and the third elastic sheet is arranged above the second elastic sheet. The third elastic sheet is provided with a through hole through which the movable part passes, a plurality of slots are radially arranged from the position close to the through hole to the outward circumferential direction, or the third elastic sheet is provided with a spiral slot surrounding the outer periphery of the through hole, or the third elastic sheet is provided with a plurality of arc-shaped slots surrounding the outer periphery of the through hole. The first elastic sheet is provided with a through hole through which the movable part passes, a plurality of slots are radially arranged from the position close to the through hole to the outward circumferential direction, or the first elastic sheet is provided with a spiral slot surrounding the outer periphery of the through hole, or the first elastic sheet is provided with a plurality of arc-shaped slots surrounding the outer periphery of the through hole.

2. The pressure sensor of claim 1, wherein: The second elastic sheet is provided with a through hole through which the movable part passes, a plurality of slots are radially arranged from the position close to the through hole to the outward circumferential direction, or the second elastic sheet is provided with a spiral slot surrounding the outer periphery of the through hole, or the second elastic sheet is provided with a plurality of arc-shaped slots surrounding the outer periphery of the through hole.

3. The pressure sensor of claim 1, wherein: The thickness of the first elastic sheet is smaller than the thickness of the second elastic sheet, and the thickness of the second elastic sheet is smaller than the thickness of the third elastic sheet.

4. The pressure sensor of any one of claims 1-3, wherein: The shell comprises an upper shell and a lower shell, the pressing part extends downward out of the lower shell, and the movable part is accommodated in the upper shell.

5. The pressure sensor of claim 1, wherein: First, second and third separation rings are arranged between the first elastic sheet and the lower shell, between the first elastic sheet and the second elastic sheet and between the second elastic sheet and the third elastic sheet.

6. The pressure sensor of claim 5, wherein: The lower shell is provided with a fixing part, the boss part is provided with a lock hole, the force pressure head and the fixing part are locked by a lock rod in the lock hole, and the aperture of the lock hole is larger than the diameter of the lock rod.

7. The pressure sensor of claim 5, wherein: The upper shell is provided with a containing space to accommodate the lifting movement of the movable part.

8. The pressure sensor of claim 5, wherein: The distance sensor is connected with a connecting line, and the connecting line extends out of the upper shell and the lower shell.

9. The pressure sensor of claim 5, wherein: ​

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