Gas pressure transmitter

Abstract

The utility model relates to a gas pressure transmitter, which comprises a main valve body and a sensor, a pressure measuring pipe cavity is arranged in the main valve body, an inlet end of the pressure measuring pipe cavity is communicated with a measured pipeline, an outlet end of the pressure measuring pipe cavity is communicated with a pressure measuring hole of the sensor, a conical valve seat is arranged at an orifice of the pressure measuring hole of the sensor, and a conical valve core is arranged on the conical valve seat. The conical valve element is composed of an end cover, a sealing plug and a guide rod, a first spring is arranged between the end cover and the conical valve seat, the end cover abuts against the outlet end of the pressure measuring pipe cavity through the first spring, a first air guide groove is formed in the end face of the end cover, the guide rod is in sliding connection with the pressure measuring hole of the sensor, and a second air guide groove is formed in the guide rod. When the pressure measuring pipe cavity of the main valve body encounters large airflow impact, the conical valve element seals the pressure measuring hole of the sensor, the pressure measuring pipe cavity is not communicated with the pressure measuring hole, and overload of the sensor is avoided. And after the airflow impact disappears, the conical valve core is reset, the pressure measuring pipe cavity is communicated with the pressure measuring hole, and pressure measurement is recovered.

Description

Technical Field

[0001] This utility model relates to a device for measuring the pressure of flowing media, specifically a gas pressure transmitter. Background Technology

[0002] Gas pressure transmitters are widely used measuring devices in both production and daily life. In practical applications, situations may arise such as airflow overload or unstable pressure exceeding the sensor's range, which can easily damage the gas pressure transmitter or shorten its lifespan. To address these issues, selecting a sensor with a larger range can be considered. However, selecting an excessively large range will reduce measurement resolution and affect the accuracy of low-pressure signal measurements. Utility Model Content

[0003] To address the problem of gas pressure transmitters being damaged by airflow impact without affecting measurement accuracy, this invention proposes a gas pressure transmitter comprising a main valve body and a sensor. The sensor is connected to the measured pipeline via the main valve body, and a conical valve core is provided between the main valve body and the sensor. When the pressure measuring chamber of the main valve body encounters a large airflow impact, the conical valve core closes the pressure measuring orifice of the sensor, preventing the pressure measuring chamber from communicating with the orifice and thus avoiding sensor overload. When the airflow impact disappears, the conical valve core resets, allowing communication between the pressure measuring chamber and the orifice to resume pressure measurement.

[0004] The objective of this utility model is achieved through the following technical solution: A gas pressure transmitter includes a main valve body and a sensor. The main valve body has a pressure measuring chamber inside. The inlet end of the pressure measuring chamber is connected to the pipeline being measured, and the outlet end of the pressure measuring chamber is connected to the pressure measuring hole of the sensor. The orifice of the pressure measuring hole of the sensor is provided with a conical valve seat. A conical valve core is provided on the conical valve seat. The conical valve core is composed of an end cap, a sealing plug, and a guide rod. A first spring is provided between the end cap and the conical valve seat. The end cap abuts against the outlet end of the pressure measuring chamber through the first spring. A first air guide groove is provided on the end face of the end cap. The guide rod is slidably connected to the pressure measuring hole of the sensor. A second air guide groove is provided on the guide rod.

[0005] In a preferred embodiment, a pressure relief chamber is provided on one side of the pressure measuring chamber, and a pressure relief valve is provided at the outlet end of the pressure relief chamber. The pressure relief valve consists of a pressure relief valve core, a second spring, and an adjusting nut. A rubber pad is provided on the end face of the pressure relief valve core, and pressure relief grooves are provided on both sides of the pressure relief valve core. The adjusting nut is threadedly connected to the main valve body, and a pressure relief hole is provided at the center of the adjusting nut.

[0006] In a preferred embodiment, the inlet end of the pressure measuring chamber of the main valve body is provided with a pipe connector for threaded connection with the pipeline being measured; the outlet end of the pressure measuring chamber of the main valve body is provided with a connection hole for threaded connection with the sensor.

[0007] In a preferred embodiment, the diameter of the end cap is smaller than the inner diameter of the connection hole of the main valve body.

[0008] In a preferred embodiment, the sealing plug is provided with a sealing ring mounting groove, and a sealing ring is provided in the sealing ring mounting groove.

[0009] This utility model has the following advantages compared with the prior art:

[0010] 1. This utility model uses a mechanical device to quickly close the measuring channel under pressure impact, preventing the impact pressure from damaging the sensor. When the pressure in the pipeline rises slowly, the airflow impact force cannot drive the conical valve core to move, and the pressure relief valve at the end of the pressure relief pipe connected to the pressure measuring pipe will open to release the pipeline pressure and prevent damage to the pressure transmitter.

[0011] 2. This utility model can select a sensor with a smaller range without being damaged by excessive impact. Using a small-range sensor can ensure higher measurement accuracy, greater safety and reliability, and improve measurement accuracy. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the conical valve core in this utility model;

[0014] Figure 3 This is a schematic diagram of the pressure relief valve in this utility model;

[0015] Reference numerals in the attached drawings: 1-Main valve body; 2-Conical valve core; 3-First spring; 4-Sensor; 5-Pressure relief valve; 11-Pressure measuring chamber; 12-Pressure relief chamber; 21-End cap; 22-Sealing plug; 23-Guide rod; 41-Pressure measuring hole; 42-Conical valve seat; 51-Pressure relief valve core; 52-Second spring; 53-Adjusting nut; 211-First air guide groove; 221-Sealing ring mounting groove; 231-Second air guide groove; 511-Pressure relief groove. Detailed Implementation

[0016] The embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to exemplarily illustrate the principles of this utility model, but should not be used to limit the scope of this utility model. That is, this utility model is not limited to the described preferred embodiments, and the scope of this utility model is defined by the claims.

[0017] In the description of this utility model, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance; those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0018] Example 1

[0019] See Figure 1 , Figure 2 This embodiment provides a gas pressure transmitter, including a main valve body 1 and a sensor 4. The main valve body 1 has a pressure measuring chamber 11 inside. The inlet end of the pressure measuring chamber is connected to the pipeline being measured, and the outlet end of the pressure measuring chamber is connected to the pressure measuring hole 41 of the sensor 4. The opening of the pressure measuring hole 41 of the sensor is provided with a conical valve seat 42. A conical valve core 2 is provided on the conical valve seat 42. The conical valve core 2 is composed of an end cover 21, a sealing plug 22, and a guide rod 23. A first spring 3 is provided between the end cover 21 and the conical valve seat 42. The end cover 21 abuts against the outlet end of the pressure measuring chamber through the first spring 3. A first air guide groove 211 is provided on the end face of the end cover 21. The guide rod 23 is slidably connected to the pressure measuring hole 41 of the sensor. A second air guide groove 231 is provided on the guide rod 23.

[0020] One end of the sensor 4 is equipped with a pipe connector, which is generally directly and sealed to the pipeline being measured. The pipeline being measured is directly connected to the pressure measuring port 41 of the sensor. In actual measurements, airflow overload impacts or unstable pressures that may exceed the sensor's range may occur. In such cases, the pressure transmitter is easily damaged or its lifespan is shortened. If a sensor with a larger range is selected, the measurement accuracy for low-pressure signals will decrease. Selecting an excessively large range will reduce the measurement resolution, while selecting an excessively small range will easily damage the sensor under high overload conditions. The gas pressure transmitter provided in this embodiment effectively solves the above problems, ensuring that the sensor will not be damaged under high overload conditions.

[0021] See Figure 2 In this embodiment, the conical valve core 2 has an end cap 21 at its head, a sealing plug 22 in its middle, and a guide rod 23 at its tail. The sealing plug 22 has a sealing ring mounting groove 221, and a sealing ring is installed in the sealing ring mounting groove 221. After the conical valve core 2 passes through the first spring 3, the guide rod 23 is inserted into the pressure measuring hole 41 of the sensor, and finally the sensor 4 is sealed and connected to the main valve body 1.

[0022] See Figure 1In this embodiment, the inlet end of the pressure measuring chamber of the main valve body 1 is provided with a pipe connector for threaded connection with the pipeline under test; the outlet end of the pressure measuring chamber of the main valve body 1 is provided with a connection hole for threaded connection with the pipe connector of the sensor 4. It is common knowledge in the art to use sealing rings at threaded connections to achieve the sealing of the gas pipeline.

[0023] See Figure 1 , Figure 2 In this embodiment, a first air guide groove 211 is provided on the end face of the conical valve core 2 to prevent the outlet end of the pressure measuring tube from being blocked and affecting the pressure measurement. The diameter of the end cap 21 is smaller than the inner diameter of the connection hole of the main valve body 1. A sealing ring mounting groove 221 is provided on the sealing plug 22, and a sealing ring is provided in the sealing ring mounting groove 221. A guide rod 23 is provided at the tail of the conical valve core 2, and a second air guide groove 231 is symmetrically provided on the guide rod 23 along the axial direction, so that airflow can pass through the sensor pressure measuring hole.

[0024] One end of the first spring 3 rests against the end cap 21 of the conical valve core, and the other end of the first spring 3 rests against the conical valve seat 42. The taper of the sealing plug 22 of the conical valve core 2 matches the taper of the conical valve seat 42. When the sealing plug 22 of the conical valve core 2 is in contact with the conical valve seat 42, the O-ring seal can seal the pressure test hole 41.

[0025] When the pressure measuring chamber 11 of the gas pressure transmitter encounters a large airflow impact, the conical valve core 2 moves towards the sensor 4 under the force of the airflow impact. The surface of the sealing plug 22 of the conical valve core 2 comes into contact with the surface of the conical valve seat 42, and the sealing ring is deformed under pressure, thus achieving a seal. When the airflow impact disappears, the pressure on the conical valve core 2 decreases, and it moves away from the sensor 4 under the action of the first spring 3. The pressure measuring channel formed by the pressure measuring chamber 11 and the pressure measuring hole 41 opens, and the sensor resumes measuring the pressure.

[0026] See Figure 1 , Figure 3 In this embodiment, a pressure relief chamber 12 is provided on one side of the pressure measuring chamber 11, and a pressure relief valve 5 is provided at the outlet end of the pressure relief chamber. The pressure relief valve 5 is composed of a pressure relief valve core 51, a second spring 52 and an adjusting nut 53. A rubber pad is provided on the end face of the pressure relief valve core 51, and pressure relief grooves 511 are provided on both sides of the pressure relief valve core 51. The pressure relief grooves 511 are two planes milled along the axial direction of the pressure relief valve core 51. The adjusting nut 53 is threadedly connected to the main valve body 1, and a pressure relief hole is provided at the center of the adjusting nut 53.

[0027] A circular groove is formed on the end face of the pressure relief valve core 51. A rubber gasket is placed in this circular groove. The pressure relief valve core 51 seals the outlet end of the pressure relief chamber through the rubber gasket. The outlet end of the pressure relief chamber has a pressure relief valve mounting hole. The pressure relief valve core 51 and the second spring 52 are sequentially installed into the pressure relief valve mounting hole. Finally, the adjusting nut 53 is threadedly connected to the pressure relief valve mounting hole. The adjusting nut 53 is used to adjust the preload of the second spring 52.

[0028] When the pressure in the pressure measuring chamber 11 rises slowly, the airflow impact force may not be able to drive the conical valve core 2 to move. The pressure relief valve 5 at the end of the pressure relief chamber 12 connected to the pressure measuring chamber 11 will open. The pressure will push the pressure relief valve core 51 to move downward, compressing the second spring 52. Gas will be discharged from the gap between the pressure relief groove and the inner wall of the pressure relief valve mounting hole through the pressure relief hole, releasing the pipeline pressure and preventing damage to the pressure transmitter.

[0029] In use, the gas pressure transmitter is connected in series in the pipeline being measured. When the pressure in the pipeline rises sharply, the pressure difference between the front and rear sides of the conical valve core 2 will push the conical valve core 2 to move. The conical valve core 2 continues to move backward against the pressure of the first spring 3 until it closes the pressure measuring port 41. When the pressure drops, the conical valve core 2 moves forward under the elastic force of the first spring 3, the pressure measuring channel reopens, and the sensor 4 resumes measuring the gas pressure. This gas pressure transmitter can effectively prevent damage from sudden increases in gas pressure and extend the service life of the gas pressure transmitter.

[0030] In this embodiment, the first spring and the second spring with appropriate elastic force can be selected according to the magnitude of the impact overload pressure and the range of the sensor.

[0031] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A gas pressure transmitter, characterized in that: The system includes a main valve body (1) and a sensor (4). The main valve body (1) has a pressure measuring chamber (11) inside. The inlet end of the pressure measuring chamber is connected to the pipeline being measured, and the outlet end of the pressure measuring chamber is connected to the pressure measuring hole (41) of the sensor (4). The orifice of the pressure measuring hole (41) of the sensor is provided with a conical valve seat (42). The conical valve seat (42) is provided with a conical valve core (2). The conical valve core (2) consists of an end cap (21) and a seal. The device consists of a plug (22) and a guide rod (23). A first spring (3) is provided between the end cap (21) and the conical valve seat (42). The end cap (21) abuts against the outlet end of the pressure measuring chamber through the first spring (3). A first air guide groove (211) is provided on the end face of the end cap (21). The guide rod (23) is slidably connected to the pressure measuring hole (41) of the sensor. A second air guide groove (231) is provided on the guide rod (23).

2. A gas pressure transmitter according to claim 1, characterized in that: A pressure relief chamber (12) is provided on one side of the pressure measuring chamber (11). A pressure relief valve (5) is provided at the outlet end of the pressure relief chamber. The pressure relief valve (5) is composed of a pressure relief valve core (51), a second spring (52) and an adjusting nut (53). A rubber pad is provided on the end face of the pressure relief valve core (51). Pressure relief grooves are provided on both sides of the pressure relief valve core (51). The adjusting nut (53) is threadedly connected to the main valve body (1). A pressure relief hole is provided in the center of the adjusting nut (53).

3. A gas pressure transmitter according to claim 2, characterized in that: The pressure measuring chamber inlet of the main valve body (1) is provided with a pipe joint for threaded connection with the pipeline under test; the pressure measuring chamber outlet of the main valve body (1) is provided with a connection hole for threaded connection with the sensor (4).

4. A gas pressure transmitter according to claim 3, characterized in that: The diameter of the end cap (21) is smaller than the inner diameter of the connection hole of the main valve body (1).

5. A gas pressure transmitter according to claim 1, characterized in that: The sealing plug (22) is provided with a sealing ring mounting groove (221), and a sealing ring is provided in the sealing ring mounting groove (221).

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