Pressure detection device

Abstract

The invention discloses a pressure detection device, and relates to the technical field of detection devices. Comprising a shell, a pressure sensor and a piston, the end, provided with an inductive resistance strain gauge, of the pressure sensor is arranged in the shell, the end, provided with a wiring plug, of the pressure sensor is arranged outside the shell, the piston is arranged in the shell, and the piston and the inductive resistance strain gauge are arranged at intervals. A sealed cavity is formed among the piston, the shell and the inductive resistance strain gauge, liquid filler is arranged in the cavity, the end, away from the pressure sensor, of the piston extends out of the shell, and the piston is in sliding connection with the shell. According to the pressure detection device provided by the invention, the piston is arranged in the shell as a sensing part in the sliding manner, so that the piston cannot generate unrecoverable deformation even if the stress is too large in the cleaning or mounting process, the pressure detection device cannot be damaged, and the normal operation of equipment is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of detection devices, and more particularly to a pressure detection device. Background Art

[0002] Pressure sensor is a common sensor that can convert the pressure data that needs to be detected, such as the pressure on an object, air pressure, hydraulic pressure, etc. into electrical signals and is an electronic device that can read the pressure value. Pressure sensors are widely used in various transmission equipment. In these transmission equipment, the pressure sensor is used to sense the pressure at a specific position to determine whether there is an object, or to determine the movement of the object on the transmission equipment through the pressure changes sensed by the pressure sensor, etc.

[0003] In order to ensure the sensitivity of existing sensors, the front sensing part is made of relatively thin metal, and the sensing resistor strain gauge is tightly attached to the relatively thin metal sensing part. When the front is subjected to force, the metal of the sensing part will deform and bend, causing the resistance of the resistor strain gauge tightly attached inside to change. The decoding op amp then calculates the amount of pressure and outputs the corresponding current.

[0004] Since the metal of the front sensing part is relatively thin, when the sensor is being cleaned or installed, if the sensing head is subjected to excessive force or bumps, it is very easy to cause the metal at the sensing position to deform and be unable to return to its original shape, resulting in damage or scrapping of the sensor, which in turn causes abnormal equipment operation and increased costs. Summary of the invention

[0005] In view of this, the present invention provides a pressure detection device, which aims to solve the problems in the above-mentioned background technology, avoid deformation of the sensing part caused by excessive force or collision, and ensure the normal operation of the device. In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0006] The present invention discloses a pressure detection device, comprising:

[0007] case;

[0008] A pressure sensor, wherein one end of the pressure sensor provided with an inductive resistance strain gauge is arranged inside the housing, and one end of the pressure sensor provided with a wiring plug is arranged outside the housing;

[0009] A piston is arranged in the housing, the piston and the inductive resistor strain gauge are spaced apart, a sealed cavity is formed between the piston, the housing and the inductive resistor strain gauge, a liquid filler is arranged in the cavity, the piston extends out of the housing at one end away from the pressure sensor, and the piston is slidably connected to the housing.

[0010] Furthermore, a liquid inlet channel is provided on the shell, the liquid inlet channel is communicated with the cavity, a sealing member is provided at one end of the liquid inlet channel away from the cavity, and the sealing member is detachably connected to the shell.

[0011] Furthermore, a sealing ring is provided between the piston and the housing.

[0012] Furthermore, the liquid filler is silicone oil.

[0013] Furthermore, the sealing member is a plug bolt.

[0014] It can be seen from the above technical solution that, compared with the prior art, the present invention discloses a pressure detection device, in which the sensing part of the sensor is set as a piston. Under pressure, the piston slides into the shell and compresses the liquid filler in the cavity. The liquid filler squeezes the inductive resistor strain gauge on the pressure sensor to detect the pressure. The piston is in contact with the outside world as a sensing part. Even if the sensing part is subjected to excessive force or bumped, it will not cause irreversible deformation, thereby ensuring the normal operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, 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 embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0016] Figure 1 This is a schematic structural diagram of the pressure detection device provided by the present invention.

[0017] In the figure: 1. housing; 2. piston; 3. sealing ring; 4. liquid inlet channel; 5. pressure sensor; 6. cavity. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1 , an embodiment of the present invention discloses a pressure detection device, comprising:

[0020] Shell 1;

[0021] A pressure sensor 5, wherein one end of the pressure sensor 5 provided with an inductive resistance strain gauge is arranged inside the housing 1, and one end of the pressure sensor 5 provided with a wiring plug is arranged outside the housing 1;

[0022] The piston 2 is arranged in the housing 1. The piston 2 and the inductive resistor strain gauge are arranged at a distance. A sealed cavity 6 is formed between the piston 2, the housing 1 and the inductive resistor strain gauge. A liquid filler is arranged in the cavity 6. The end of the piston 2 away from the pressure sensor 5 extends out of the housing 1. The piston 2 is slidably connected to the housing 1.

[0023] The piston 2 contacts with an external object, and the object squeezes the piston 2 so that the piston 2 slides into the housing 1. The piston 2 slides into the housing 1 and squeezes the liquid filling in the cavity 6. The liquid filling is compressed and applies pressure to the inductive resistor strain gauge. After the inductive resistor strain gauge of the pressure sensor 5 senses the pressure, it is converted into a current signal output through the sensor.

[0024] The pressure sensor 5 is electrically connected to the signal generator, and the pressure on the inductive resistor strain gauge is output through the change value of the current on the signal generator.

[0025] According to some embodiments provided by the present invention, a liquid inlet channel 4 is provided on the shell 1, and the liquid inlet channel 4 is connected to the cavity 6. A seal is provided at one end of the liquid inlet channel 4 away from the cavity 6. The seal is detachably connected to the shell 1. Liquid filler is introduced into the cavity 6 through the liquid inlet channel 4, so that all the air in the cavity 6 is discharged, thereby ensuring the accuracy of the detection result of the pressure detection device.

[0026] According to some embodiments provided by the present invention, a sealing ring 3 is provided between the piston 2 and the housing 1 to ensure the air tightness of the cavity 6, prevent air from entering the cavity 6, and ensure the accuracy of the detection result.

[0027] According to some embodiments provided by the present invention, the liquid filler is silicone oil, and the pressure sensed by the piston 2 is transmitted to the inductive resistor strain gauge of the sensor in the form of silicone oil, thereby ensuring the sensitivity of the pressure detection device.

[0028] According to some embodiments provided by the present invention, the sealing member is a plug bolt.

[0029] The working principle of the pressure detection device of the present invention is as follows: when detecting the received pressure, the pressure is applied to the piston 2, and the piston 2 slides into the shell 1 under the action of the pressure. At this time, the silicone oil in the cavity 6 is squeezed and compressed by the piston 2, and the compressed silicone oil applies pressure to the induction resistor strain gauge. After the induction resistor strain gauge is subjected to pressure, the current value on the signal generator changes; the piston 2 is slidably arranged in the shell 1 as a sensing part, and even if it is subjected to excessive force during cleaning or installation, irreversible deformation will not occur, and the pressure detection device will not be damaged, thereby ensuring the normal operation of the equipment.

[0030] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0031] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pressure detection device, characterized in that: include: case; A pressure sensor, wherein one end of the pressure sensor provided with an inductive resistance strain gauge is arranged inside the housing, and one end of the pressure sensor provided with a wiring plug is arranged outside the housing; A piston is arranged in the housing, the piston and the inductive resistor strain gauge are spaced apart, a sealed cavity is formed between the piston, the housing and the inductive resistor strain gauge, a liquid filler is arranged in the cavity, the piston extends out of the housing at one end away from the pressure sensor, and the piston is slidably connected to the housing.

2. The pressure detection device according to claim 1, characterized in that: The shell is provided with a liquid inlet channel, the liquid inlet channel is communicated with the cavity, a sealing member is provided at one end of the liquid inlet channel away from the cavity, and the sealing member is detachably connected to the shell.

3. The pressure detection device according to claim 1, characterized in that: A sealing ring is arranged between the piston and the housing.

4. The pressure detection device according to claim 1, characterized in that: The liquid filler is silicone oil.

5. The pressure detection device according to claim 2, characterized in that: The sealing member is a plug bolt.

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