A pressure sensor for preventing backflow

Abstract

The present invention relates to the field of pressure sensor detection technology, and discloses a backflow-proof pressure sensor, including a shell, on which a water outlet pipe, a connecting pipe and a detection head are axially connected in sequence, and the outer side of the connecting pipe is connected to a water inlet pipe. The backflow-proof pressure sensor is used in conjunction with a valve, a transmission element and a baffle. When the water flow inside the pressure sensor flows back, the pressure of the backflow will make the valves stick to each other and press the first pressure sensitive element on the baffle, thereby detecting the pressure value generated by the backflow, and the transmission element only outputs the pressure value of the first pressure sensitive element. When the water flow inside the pressure sensor is normal, the valves will separate from each other, and the second pressure sensitive element inside the detection head will detect the water pressure. The transmission element outputs the pressure value of the second pressure sensitive element, thereby distinguishing the pressure value generated under the backflow and normal conditions, and achieving the purpose of accurately distinguishing the pressure value.

Description

Technical Field

[0001] The invention relates to the technical field of pressure sensor detection, in particular to a backflow prevention pressure sensor. Background Art

[0002] Water pressure sensor is a commonly used pressure sensor in industrial practice. It is widely used in various industrial dynamic environments, water conservancy and hydropower projects, transportation and construction equipment, production automatic control systems, aerospace technology, ship technology and transportation pipelines. The core of the water pressure sensor is usually made of diffused silicon. The working principle is that the pressure of the measured water pressure directly acts on the diaphragm of the sensor, causing the diaphragm to produce a micro-displacement proportional to the water pressure, causing the resistance value of the sensor to change, and using electronic circuits to detect this change, and convert and output a standard measurement signal corresponding to the pressure.

[0003] In the process of detecting the pressure inside the pipe by the water pressure sensor in the prior art, since the water flow in the pipe will produce backflow, the pressure sensor cannot accurately distinguish the detected backflow pressure value and the forward water flow pressure value, cannot accurately indicate the pressure change in the pipe, and does not have the function of preventing backflow. Therefore, a backflow prevention pressure sensor is proposed to solve the above-mentioned problems. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the shortcomings of the prior art, the present invention provides a backflow prevention pressure sensor with the advantages of accurately distinguishing pressure values, etc., which solves the problem that the existing water pressure sensor cannot accurately distinguish the detected backflow pressure value and the forward water flow pressure value, and cannot accurately indicate the pressure changes in the pipe.

[0006] (II) Technical solution

[0007] In order to achieve the above-mentioned purpose of accurately distinguishing the pressure value, the present invention provides the following technical solution: a backflow prevention pressure sensor, comprising a housing, on which a water outlet pipe, a connecting pipe and a detection head are axially connected in sequence, and the outer side of the connecting pipe is connected to a water inlet pipe;

[0008] The connecting tube includes a circular tube, a valve, a baffle, a mounting ring and a first pressure sensitive element. The valve and the baffle are connected to the inside of the circular tube through the mounting ring. The first pressure sensitive element is mounted on the baffle. The first pressure sensitive element is electrically connected to the detection head for detecting the pressure of the reflux.

[0009] The detection head includes an electrical connector, a second pressure sensitive element and a transmission element. The second pressure sensitive element and the transmission element are both installed inside the electrical connector. The second pressure sensitive element and the transmission element are electrically connected to each other for detecting the pressure of the forward water flow.

[0010] Preferably, the baffle is located on a side of the circular tube close to the water inlet pipe, and the first pressure sensitive element is located on a side of the baffle close to the valve.

[0011] Preferably, the connecting block piece comprises a connecting rod and a square piece, the square piece is connected to two sides of the connecting rod, and one end of the connecting rod away from the square piece is connected to a connecting ring.

[0012] Preferably, the connecting pipe is also provided with threads for connecting to a water inlet pipe.

[0013] Preferably, a clamping groove and a threaded groove are provided inside the water inlet pipe, the threaded grooves are located on both sides of the clamping groove, and the water inlet pipe is connected to a filter assembly via the clamping groove.

[0014] Preferably, the thread groove and the thread are matched to each other and are used to connect the connecting pipe.

[0015] Preferably, the filter assembly comprises a circular ring, the interior of the circular ring is connected to a filter screen, the exterior of the circular ring is connected to a clamping block, and the clamping block matches a clamping slot.

[0016] Preferably, the detection head also includes a computing element for performing output operations on the pressure values ​​of the first pressure sensitive element and the second pressure sensitive element. When the first pressure sensitive element detects pressure, the pressure value of the second pressure sensitive element is not output, but the pressure value of the first pressure sensitive element is output.

[0017] (III) Beneficial effects

[0018] Compared with the prior art, the present invention provides a backflow prevention pressure sensor, which has the following beneficial effects:

[0019] 1. The anti-backflow pressure sensor is used in conjunction with a valve, a transmission element and a baffle. When the water flow inside the pressure sensor flows back, the backflow pressure will cause the valves to fit together and press the first pressure sensitive element on the baffle, thereby detecting the pressure value generated by the backflow. The transmission element only outputs the pressure value of the first pressure sensitive element. When the water flow inside the pressure sensor is normal, the valves will separate from each other, and the second pressure sensitive element inside the detection head will detect the water pressure. The transmission element outputs the pressure value of the second pressure sensitive element, thereby distinguishing the pressure values ​​generated under backflow and normal conditions, thereby achieving the purpose of accurately distinguishing the pressure values.

[0020] 2. The anti-backflow pressure sensor uses a valve and a baffle in combination. When backflow occurs, the valve is compressed and fitted to form a circle to seal the circular tube, and the baffle blocks it to achieve a limiting function. Through the use of a filter assembly, the filter mesh and the card block in the filter assembly filter the water flow entering the pressure sensor to prevent excessive impurities in the water flow from accumulating inside and causing blockage, thereby achieving the purpose of anti-backflow and anti-blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of a backflow prevention pressure sensor proposed by the present invention.

[0022] Figure 2 This is a schematic diagram of a water inlet pipe in a backflow prevention pressure sensor proposed by the present invention.

[0023] Figure 3 A schematic diagram of a filter assembly in a backflow-proof pressure sensor proposed by the present invention.

[0024] Figure 4 The figure is a three-dimensional schematic diagram of a connecting tube in a backflow-proof pressure sensor proposed by the present invention.

[0025] Figure 5 This is a schematic diagram of the interior of a connecting tube in a backflow prevention pressure sensor proposed by the present invention.

[0026] Figure 6 for Figure 5 Schematic diagram of the back structure of the middle baffle.

[0027] In the figure: 1 shell, 2 detection head, 3 water outlet pipe, 4 connecting pipe, 401 round pipe, 402 first pressure sensitive element, 403 mounting ring, 404 valve, 405 baffle, 406 thread, 5 water inlet pipe, 6 card slot, 7 thread slot, 8 filter assembly, 801 round ring, 802 card block, 803 filter screen, 9 transmission element. DETAILED DESCRIPTION

[0028] The following will be combined with 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.

[0029] See also Figure 1-6A backflow prevention pressure sensor comprises a housing 1, on which a water outlet pipe 3, a connecting pipe 4 and a detection head 2 are connected in sequence in an axial manner, a water inlet pipe 5 is connected to the outside of the connecting pipe 4, a card slot 6 and a threaded slot 7 are provided inside the water inlet pipe 5, the threaded slot 7 is located on both sides of the card slot 6, the threaded slot 7 and the thread 406 are adapted to be connected to the connecting pipe 4, the water inlet pipe 5 is connected to a filter assembly 8 through the card slot 6, the filter assembly 8 comprises a circular ring 801, a filter screen 803 is connected inside the circular ring 801, the filter screen 803 may be a textile fiber filter screen or a metal filter screen, a card block 802 is connected to the outside of the circular ring 801, and the card block 802 matches the card slot 6;

[0030] The connecting tube 4 includes a circular tube 401, a valve 404, a baffle 405, a mounting ring 403 and a first pressure sensitive element 402. The valve 404 is made of an elastic material, which may be rubber. The valve 404 and the baffle 405 are both connected to the inside of the circular tube 401 through the mounting ring 403. The first pressure sensitive element 402 is installed on the baffle 405. The baffle 405 is located on the side of the circular tube 401 close to the water inlet pipe 5. The first pressure sensitive element 402 is located on the side of the baffle 405 close to the valve 404. The baffle 405 includes a connecting rod and a square plate. The square plate is connected to both sides of the connecting rod. One end of the connecting rod away from the square plate and the connecting ring 403 are connected to the first pressure sensitive element 402 and the detection head 2 for telecommunication connection, which is used to detect the pressure of the reflux. The connecting tube 4 is also provided with a thread 406 for connecting the water inlet pipe 5.

[0031] The detection head 2 includes an electrical connector, a second pressure sensitive element and a transmission element 9. The transmission element 9 can be wireless transmission or wired transmission. The second pressure sensitive element and the transmission element 9 are both installed inside the electrical connector. The second pressure sensitive element and the transmission element 9 are electrically connected and are used to detect the pressure of the forward water flow. The detection head 2 also includes an operating element. The operating element can be a single chip or a CPU processing chip, which is used to output the pressure values ​​of the first pressure sensitive element 402 and the second pressure sensitive element. When the first pressure sensitive element 402 detects pressure, the pressure value of the second pressure sensitive element is not output, and the pressure value of the first pressure sensitive element 402 is output.

[0032] When using:

[0033] Water flows in from the water inlet pipe 5 and is filtered by the filter assembly 8. The pressure of the positive water flow separates the valves 404 from each other. At the same time, the second pressure sensitive element inside the detection head 2 detects the water pressure. After calculation by the operation element, the transmission element 9 outputs the pressure value of the second pressure sensitive element. When the water flow inside the pressure sensor flows back, the pressure of the backflow will cause the valves 404 to fit together and press the first pressure sensitive element 402 on the baffle 405, thereby detecting the pressure value generated by the backflow. After calculation by the operation element, the transmission element 9 only outputs the pressure value of the first pressure sensitive element 402.

[0034] The anti-backflow pressure sensor is used in conjunction with the valve 404, the transmission element 9 and the baffle 405. When the water flow inside the pressure sensor flows back, the backflow pressure will cause the valves 404 to fit together and press the first pressure sensitive element 402 on the baffle 405, thereby detecting the pressure value generated by the backflow. The transmission element 9 only outputs the pressure value of the first pressure sensitive element 402. When the water flow inside the pressure sensor is normal, the valves 404 will separate from each other, and the second pressure sensitive element inside the detection head 2 will detect the water pressure. The transmission element 9 outputs the pressure value of the second pressure sensitive element, thereby distinguishing the pressure value generated under the backflow and normal conditions, achieving the purpose of accurately distinguishing the pressure values, and solving the problem that the existing water pressure sensor cannot accurately distinguish the detected backflow pressure value and the forward water flow pressure value, and cannot accurately indicate the pressure changes in the pipe.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A backflow prevention pressure sensor, characterized in that: It comprises a shell (1), to which a water outlet pipe (3), a connecting pipe (4) and a detection head (2) are axially connected in sequence, and the outer side of the connecting pipe (4) is connected to a water inlet pipe (5); The connecting tube (4) comprises a circular tube (401), a valve (404), a baffle (405), a mounting ring (403) and a first pressure sensitive element (402); the valve (404) and the baffle (405) are both connected to the inside of the circular tube (401) via the mounting ring (403); the first pressure sensitive element (402) is mounted on the baffle (405); the first pressure sensitive element (402) is electrically connected to the detection head (2) for detecting the pressure of the reflux; The detection head (2) comprises an electrical connection head, a second pressure sensitive element and a transmission element (9), wherein the second pressure sensitive element and the transmission element (9) are both installed inside the electrical connection head, and the second pressure sensitive element and the transmission element (9) are connected to each other by telecommunication, and are used to detect the pressure of the forward water flow; The baffle (405) is located on a side of the circular tube (401) close to the water inlet pipe (5), and the first pressure sensitive element (402) is located on a side of the baffle (405) close to the valve (404); The blocking piece (405) comprises a connecting rod and a square piece, wherein the square piece is connected to two sides of the connecting rod, and one end of the connecting rod away from the square piece is connected to the mounting ring (403).

2. The anti-backflow pressure sensor according to claim 1, characterized in that: The connecting pipe (4) is also provided with a thread (406) for connecting to the water inlet pipe (5).

3. The anti-backflow pressure sensor according to claim 1, characterized in that: The water inlet pipe (5) is provided with a clamping groove (6) and a thread groove (7) inside, the thread groove (7) is located on both sides of the clamping groove (6), and the water inlet pipe (5) is connected to a filter assembly (8) via the clamping groove (6).

4. The anti-backflow pressure sensor according to claim 2 or 3, characterized in that: The thread groove (7) and the thread (406) are matched to each other and are used to connect the connecting pipe (4).

5. The anti-backflow pressure sensor according to claim 3, characterized in that: The filter assembly (8) comprises a circular ring (801), the interior of the circular ring (801) is connected to a filter screen (803), the exterior of the circular ring (801) is connected to a clamping block (802), and the clamping block (802) matches the clamping slot (6).

6. The anti-backflow pressure sensor according to claim 1, characterized in that: The detection head (2) also includes a computing element for performing output operations on the pressure values ​​of the first pressure sensitive element (402) and the second pressure sensitive element; when the first pressure sensitive element (402) detects pressure, the pressure value of the second pressure sensitive element is not output, but the pressure value of the first pressure sensitive element (402) is output.

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