Pressure sensor

Abstract

The utility model provides a pressure sensor, and belongs to the technical field of pressure sensors. The problem that an existing pressure sensor is low in detection precision is solved. The pressure sensor comprises a shell with a water inlet, and a push rod, an elastic piece and a diaphragm which are arranged in the shell, one end of the push rod pushes the diaphragm to be tightly pressed on the water inlet under the action of the elastic force of the elastic piece, the other end of the push rod is fixedly connected with a magnet, and the shell is provided with a sensor capable of sensing the magnetic field change of the magnet. The diaphragm comprises a fixing part located on the circumferential edge, a U-shaped deformation part and a pushing part located in the center, the fixing part and the pushing part are connected with the two sides of a U-shaped opening of the deformation part respectively, the fixing part is fixedly connected with the shell in a sealed mode, the pushing part and the water inlet are oppositely arranged, and one end of the push rod acts on the pushing part. The pressure sensor has the advantage of high detection precision.

Description

Technical Field

[0001] The utility model belongs to the technical field of pressure sensors and relates to a pressure sensor. Background Art

[0002] A pressure sensor is used to measure pressure. It is a device that converts pressure signals into measurable electrical signal outputs.

[0003] Existing pressure sensors for measuring pressure, for example, Chinese patent literature discloses a new type of pressure sensor [patent number: 201921164294.6; authorization announcement number: CN210005152U], which includes a base and a shell arranged on the base, the outer end of the base is a water inlet end, a diaphragm is provided between the base and the shell, the diaphragm and the inner side wall of the base form a water inlet cavity, the water inlet end is connected to the water inlet cavity, a top block and a spring are provided in the shell, the spring pushes the top block to rest on the diaphragm, a magnet is fixedly connected to the top block, a Hall sensor is fixedly connected to the shell, and the Hall sensor can sense the magnet.

[0004] When using a pressure sensor with this structure, water flows into the water inlet chamber through the water inlet end, and the water pressure pushes the diaphragm upward. The diaphragm pushes the top block to drive the magnet upward, and the Hall sensor senses the change in the magnetic induction line, thereby sensing the water pressure. However, the diaphragm of the pressure sensor with this structure is flat or wavy. When the water flow impacts the diaphragm, the diaphragm itself needs to produce a large deformation to overcome the elastic force of the spring to push the top block and the magnet to move. The deformation of the diaphragm has a hysteresis problem, which leads to a delay in the pressure sensor detection and reduces the detection accuracy. Summary of the invention

[0005] The purpose of the utility model is to propose a pressure sensor in view of the above problems existing in the prior art, and the technical problem solved is how to improve the detection accuracy of the pressure sensor.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a pressure sensor, comprising a shell with a water inlet and a push rod, an elastic member and a diaphragm arranged in the shell, one end of the push rod pushes the diaphragm to be pressed against the water inlet under the action of the elastic force of the elastic member, the other end of the push rod is fixedly connected to a magnet, and a sensor that can sense the change of the magnetic field of the magnet is provided on the shell, characterized in that the diaphragm includes a fixed portion located at the circumferential edge, a U-shaped deformation portion and a pushing portion located in the center, the fixed portion and the pushing portion are respectively connected to two sides of the U-shaped opening of the deformation portion, the fixed portion is sealed and fixedly connected to the shell, the pushing portion is arranged opposite to the water inlet, and one end of the push rod acts on the pushing portion.

[0007] When working, water enters the housing from the water inlet and acts on the pushing part of the diaphragm. When the water pressure is high, the water flow pushes the pushing part so that the diaphragm overcomes the elastic force of the elastic member and moves away from the water inlet, causing the position of the magnet to change. The sensor senses the change in the magnetic field and thus detects the pressure. When the water pressure is low, the elastic member pushes the pushing part so that the diaphragm approaches the water inlet, causing the position of the magnet to change. The sensor senses the change in the magnetic field and thus detects the pressure. The operator can adjust the starting pressure of the controller according to the actual pressure detection. The deformation part is U-shaped, and the fixed part and the pushing part are respectively connected to the two sides of the U-shaped opening of the deformation part. This structure causes the deformation of the diaphragm to mainly occur at the deformation part, and mainly deforms along the axial movement of the push rod. The deformation speed is fast, and there is no hysteresis problem, thereby improving the detection accuracy of the pressure sensor. The sensor can be a magnetic resistance.

[0008] In the above-mentioned pressure sensor, one end of the push rod has a push head, and the push head has a push ring that is annular and circumferentially protruding, and the push head is embedded in the space surrounded by the push portion and the deformation portion, and the U-shaped bottom of the deformation portion can abut against the push ring. This structure makes the push rod and the diaphragm fit better, so that the deformation of the diaphragm can be better and more timely transmitted to the push rod, and at the same time, the push rod can better push the diaphragm, thereby improving the detection accuracy of the pressure sensor.

[0009] In the above-mentioned pressure sensor, the elastic member is a cylindrical spring, one end of the elastic member acts on the push ring, and the other end acts on the housing. The push ring is used for the elastic member to abut against and also for limiting the deformation part, having a dual function.

[0010] In the above-mentioned pressure sensor, the pusher has a plurality of arc-shaped convex strips protruding toward the water inlet, all of which are arranged in a circle and located at the edge of the water inlet, and there is a gap between two adjacent convex strips. The convex strips separate the pusher from the housing, and there is a gap between two adjacent convex strips to prevent the diaphragm from being sucked by the water inlet of the housing, thereby ensuring that the water can flow smoothly, thereby improving the detection accuracy of the pressure sensor.

[0011] In the above-mentioned pressure sensor, the housing includes a base, a main body base and a limit seat, the water inlet is located in the base, the base and the main body base are detachably connected by threads, the limit seat is fixed between the base and the main body base, and the fixing part is fixed between the limit seat and the base. The limit seat is driven to move by rotating the main body base, and the fixing part is pressed by the limit seat to position the diaphragm, so that the pressure sensor is easy to install.

[0012] In the above-mentioned pressure sensor, the limit seat has a clamping ring in an annular shape and protruding toward the fixing part, and the clamping ring abuts against the fixing part. The setting of the clamping ring increases the friction between the limit seat and the fixing part, so that the fixing part will not deviate from the set position, improves the firmness of the fixing part installation, and thus improves the firmness and sealing of the diaphragm installation.

[0013] In the above-mentioned pressure sensor, the fixing part has a sealing part which is annular and protrudes toward the base, and the sealing part is sealed against the base. When the fixing part is pressed, the sealing part will be deformed to a certain extent to form a better seal.

[0014] In the above-mentioned pressure sensor, the base has a water inlet cavity which is concavely arranged and communicated with the water inlet, and the pusher can be embedded in the water inlet cavity. The water inlet cavity firstly provides a space for the pusher to move, and secondly allows water to flow in and out of the water inlet more smoothly, thereby improving the detection accuracy of the pressure sensor.

[0015] In the above-mentioned pressure sensor, a mounting groove is provided in the main body seat, a circuit board is inserted into the mounting groove, and the sensor is fixedly connected to the circuit board. This structure makes the sensor easy to install.

[0016] In the above-mentioned pressure sensor, a vent hole is provided in the main body seat, and the vent hole connects the internal space of the shell with the outside world. The vent hole is connected with the space surrounded by the main body seat, the limit seat and the diaphragm, so that the air pressure difference in the space is always the same as that in the outside world, avoiding the influence of air pressure changes on the diaphragm, thereby improving the detection accuracy of the pressure sensor.

[0017] Compared with the prior art, the pressure sensor provided by the utility model has the following advantages:

[0018] 1. The deformation part of the pressure sensor is U-shaped, and the fixed part and the pushing part are respectively connected to the two sides of the U-shaped opening of the deformation part, so that the deformation of the diaphragm mainly occurs at the deformation part, and mainly deforms along the axial movement of the push rod. The deformation speed is fast and there is no lag problem, thereby improving the detection accuracy of the pressure sensor.

[0019] 2. The convex strips arranged on the push part of the pressure sensor separate the push part and the shell, and there is a gap between two adjacent convex strips to prevent the diaphragm from being sucked by the water inlet of the shell, thereby ensuring that the water can flow smoothly, thereby improving the detection accuracy of the pressure sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the pressure sensor.

[0021] Figure 2This pressure sensor Figure 1 Magnified image of area A.

[0022] Figure 3 It is a structural schematic diagram of the front side of the pressure sensor diaphragm.

[0023] Figure 4 It is a schematic diagram of the structure of the reverse side of the diaphragm of the pressure sensor.

[0024] Figure 5 This is a schematic diagram of the external structure of the pressure sensor.

[0025] In the figure, 1, water inlet; 2, shell; 21, base; 22, main body seat; 23, limit seat; 24, clamping ring; 3, push rod; 31, push head; 32, push ring; 4, elastic member; 5, diaphragm; 51, fixing part; 52, deformation part; 53, pushing part; 54, convex strip; 55, sealing part; 6, magnet; 7, sensor; 8, water inlet chamber; 9, mounting groove; 10, circuit board; 11, vent. DETAILED DESCRIPTION

[0026] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0027] like Figure 1 As shown, the pressure sensor 7 includes a housing 2, a push rod 3, an elastic member 4, a diaphragm 5, a magnet 6, a sensor 7 and a circuit board 10.

[0028] The push rod 3, the elastic member 4 and the diaphragm 5 are all arranged in the outer shell 2, and the outer shell 2 includes a base 21, a main body seat 22 and a limit seat 23. The base 21 has a water inlet 1 and a water inlet cavity 8 which is recessed and connected to the water inlet 1. The base 21 and the main body seat 22 are detachably connected by threads, and the limit seat 23 is fixed between the base 21 and the main body seat 22.

[0029] like Figure 2 , Figure 3 , Figure 4 As shown, the diaphragm 5 includes a fixing portion 51 located at the circumferential edge, a U-shaped deformation portion 52 and a pushing portion 53 located at the center, and the fixing portion 51 and the pushing portion 53 are respectively connected to the two sides of the U-shaped opening of the deformation portion 52. The fixing portion 51 is fixed between the limiting seat 23 and the base 21 to form a seal, and the limiting seat 23 has a clamping ring 24 that is annular and protrudes toward the fixing portion 51, and the clamping ring 24 abuts against the fixing portion 51, and the fixing portion 51 has a sealing portion 55 that is annular and protrudes toward the base 21, and the sealing portion 55 is sealed against the base 21.

[0030] One end of the push rod 3 has a push head 31, and the push head 31 has a push ring 32 that is annular and circumferentially protruding. The push head 31 is embedded in the space surrounded by the push portion 53 and the deformation portion 52. The U-shaped bottom of the deformation portion 52 can abut against the push ring 32. The push portion 53 is arranged opposite to the water inlet 1, and the push portion 53 can be embedded in the water inlet cavity 8. The elastic member 4 is a cylindrical spring, one end of the elastic member 4 acts on the push ring 32, and the other end acts on the housing 2. Under the action of the elastic force of the elastic member 4, one end of the push rod 3 pushes the diaphragm 5 to be pressed against the water inlet 1, and the other end of the push rod 3 is fixedly connected to a magnet 6. The housing 2 is provided with a sensor 7 that can sense the change of the magnetic field of the magnet 6.

[0031] In this embodiment, the pushing portion 53 has four arc-shaped convex strips 54 protruding toward the water inlet 1. All the convex strips 54 form a circle and are located at the edge of the water inlet 1. There is a gap between two adjacent convex strips 54. In actual production, the number of the convex strips 54 is three or five.

[0032] like Figure 5 As shown, a mounting groove 9 is provided in the main body seat 22, a circuit board 10 is inserted in the mounting groove 9, and the sensor 7 is fixedly connected to the circuit board 10. A vent hole 11 is provided in the main body seat 22, and the vent hole 11 connects the inner space of the housing 2 with the outside.

[0033] During operation, water enters the housing 2 from the water inlet 1 and acts on the pushing portion 53 of the diaphragm 5. When the water pressure is high, the water flow pushes the pushing portion 53 so that the diaphragm 5 overcomes the elastic force of the elastic member 4 and moves away from the water inlet 1, causing the position of the magnet 6 to change. The sensor 7 senses the change in the magnetic field, thereby detecting the pressure. When the water pressure is low, the elastic member 4 pushes the pushing portion 53 so that the diaphragm 5 approaches the water inlet 1, causing the position of the magnet 6 to change. The sensor 7 senses the change in the magnetic field, thereby detecting the pressure.

[0034] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0035] Although this article uses more terms such as water inlet 1, housing 2, base 21, main body seat 22, limit seat 23, clamping ring 24, push rod 3, push head 31, push ring 32, elastic member 4, diaphragm 5, fixing part 51, deformation part 52, pushing part 53, convex strip 54, sealing part 55, magnet 6, sensor 7, water inlet cavity 8, mounting groove 9, circuit board 10, vent hole 11, etc., it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A pressure sensor, comprising a housing (2) having a water inlet (1), and a push rod (3), an elastic member (4) and a diaphragm (5) arranged in the housing (2), wherein one end of the push rod (3) pushes the diaphragm (5) to be pressed against the water inlet (1) under the action of the elastic force of the elastic member (4), the other end of the push rod (3) is fixedly connected with a magnet (6), and a sensor (7) capable of sensing changes in the magnetic field of the magnet (6) is provided on the housing (2), characterized in that: The diaphragm (5) comprises a fixed portion (51) located at the circumferential edge, a U-shaped deformation portion (52) and a pushing portion (53) located at the center; the fixed portion (51) and the pushing portion (53) are respectively connected to two sides of the U-shaped opening of the deformation portion (52); the fixed portion (51) is sealed and fixedly connected to the housing (2); the pushing portion (53) is arranged opposite to the water inlet (1); and one end of the push rod (3) acts on the pushing portion (53).

2. A pressure sensor according to claim 1, characterized in that: One end of the push rod (3) has a push head (31), and the push head (31) has a push ring (32) which is annular and protrudes in the circumferential direction. The push head (31) is embedded in a space surrounded by the push portion (53) and the deformation portion (52), and the U-shaped bottom of the deformation portion (52) can abut against the push ring (32).

3. A pressure sensor according to claim 2, characterized in that: The elastic member (4) is a cylindrical spring, one end of the elastic member (4) acts on the push ring (32), and the other end acts on the housing (2).

4. A pressure sensor according to claim 1, 2 or 3, characterized in that: The pushing portion (53) has a plurality of arc-shaped convex strips (54) protruding toward the water inlet (1), all of the convex strips (54) form a circle and are located at the edge of the water inlet (1), and there is a gap between two adjacent convex strips (54).

5. A pressure sensor according to claim 1, 2 or 3, characterized in that: The housing (2) comprises a base (21), a main body seat (22) and a limit seat (23); the water inlet (1) is located in the base (21); the base (21) and the main body seat (22) are detachably connected via threads; the limit seat (23) is fixed between the base (21) and the main body seat (22); and the fixing portion (51) is fixed between the limit seat (23) and the base (21).

6. A pressure sensor according to claim 5, characterized in that: The limiting seat (23) has a clamping ring (24) in an annular shape and protruding toward the fixing portion (51), and the clamping ring (24) abuts against the fixing portion (51).

7. A pressure sensor according to claim 5, characterized in that: The fixing portion (51) has a sealing portion (55) which is annular and protrudes toward the base (21), and the sealing portion (55) is sealingly attached to the base (21).

8. A pressure sensor according to claim 5, characterized in that: The base (21) has a water inlet cavity (8) which is recessed and communicates with the water inlet (1), and the pushing portion (53) can be embedded in the water inlet cavity (8).

9. A pressure sensor according to claim 5, characterized in that: The main body seat (22) is provided with a mounting groove (9), a circuit board (10) is inserted into the mounting groove (9), and the sensor (7) is fixedly connected to the circuit board (10).

10. The pressure sensor according to claim 5, characterized in that: A vent hole (11) is provided in the main body seat (22), and the vent hole (11) enables the internal space of the outer shell (2) to communicate with the outside.

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