An automatic gas pressure range switching device

Abstract

This utility model belongs to the field of pipeline pressure detection technology and discloses an automatic gas pressure range switching device, including a valve body, a deformable component, and a sealing piston. The valve body has a valve cavity, a pressure to be measured channel, a first measuring channel, and a second measuring channel, all of which are connected to the valve cavity. The deformable component is disposed inside the valve cavity and is used to move the sealing piston along a first direction when the gas pressure inside the valve cavity changes. The deformable component has a reset state and a deformed state. When the gas pressure delivered to the valve cavity by the pressure to be measured exceeds a threshold, the deformable component switches from the reset state to the deformed state. When the deformable component is in the reset state, the pressure to be measured channel is connected to the first measuring channel; when the deformable component is in the deformed state, the pressure to be measured channel is isolated from the first measuring channel. The first direction is parallel to the length direction of the valve cavity. Thus, pressure gauges with different ranges can be selected for measurement according to the gas pressure.

Description

Technical Field

[0001] This utility model relates to the field of pipeline pressure detection technology, and in particular to an automatic gas pressure range switching device. Background Technology

[0002] In many situations, the gas transmission pressure of the same gas transmission pipeline varies significantly at different times and under different operating conditions. Under normal operating conditions, since the gas pressure in the pipeline is relatively low, a low-range pressure gauge is usually selected to measure the pipeline pressure. However, when the system fails or is shut down or put into operation, it is necessary to backflush the pipeline with several times or even tens of times the pressure of the normal operating conditions to remove toxic, harmful, flammable and explosive gases from the pipeline.

[0003] However, when high-pressure gas backflushs the pipeline, it may damage the low-range pressure gauge. If it is replaced with a high-range pressure gauge, it will affect the accuracy of pipeline pressure measurement under normal operating conditions. Utility Model Content

[0004] The purpose of this invention is to provide an automatic gas pressure range switching device to solve the problem that neither high-range nor low-range pressure gauges can meet the requirements for pipeline pressure detection under different operating conditions.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] An automatic gas pressure range switching device includes: a valve body, wherein the valve body has a valve cavity, a measured pressure channel, a first measuring channel, and a second measuring channel, all of which are connected to the valve cavity; a deformable component and a sealing piston, wherein the deformable component is disposed inside the valve cavity and is used to drive the sealing piston to move along a first direction when the gas pressure inside the valve cavity changes; the deformable component has a reset state and a deformed state; when the gas pressure delivered to the valve cavity by the measured pressure channel exceeds a threshold, the deformable component switches from the reset state to the deformed state; when the deformable component is in the reset state, the measured pressure channel is connected to the first measuring channel; when the deformable component is in the deformed state, the measured pressure channel is isolated from the first measuring channel; the first direction is parallel to the length direction of the valve cavity.

[0007] Preferably, the valve body is connected to a measuring pipe joint, a first measuring joint, and a second measuring joint. The pressure to be measured is opened at the measuring pipe joint, the first measuring channel is opened at the first measuring joint, and the second measuring channel is opened at the second measuring joint. The measuring pipe joint and the first measuring joint are respectively located on both sides of the second measuring joint in a second direction; the second direction is perpendicular to the first direction.

[0008] Preferably, the sealing piston is connected to a piston rod, the two ends of which are connected to the sealing piston and the deformable member, respectively, and the piston rod extends along the first direction.

[0009] Preferably, the automatic gas pressure range switching device further includes an elastic element connected to the deformable element, the elastic element being disposed on the side of the deformable element away from the sealing piston, so that the deformable element switches between the reset state and the deformed state.

[0010] Preferably, the elastic element is a spring that extends along the first direction.

[0011] Preferably, the automatic gas pressure range switching device further includes an adjusting component connected to the elastic component, which is used to adjust the magnitude of the force exerted by the elastic component on the deformable component.

[0012] Preferably, the adjusting component is an adjusting screw, which is threaded to the valve body and coaxially arranged with the valve cavity.

[0013] Preferably, the valve chamber includes a first chamber, a second chamber, and a third chamber, arranged sequentially along the first direction. The first chamber is connected to the pressure channel being measured and the second measurement channel, the second chamber is connected to the first measurement channel, and the third chamber is connected to the outside. When the deformable part is in the reset state, the first chamber is connected to the second chamber, and when the deformable part is in the deformed state, the first chamber is isolated from the second chamber.

[0014] Preferably, the deformable component is a diaphragm, which is coaxially arranged with the valve cavity.

[0015] Preferably, the valve body has a receiving groove communicating with the valve cavity, and the diaphragm is fitted into the receiving groove.

[0016] The beneficial effects of this utility model are:

[0017] An automatic gas pressure range switching device includes a valve body, a deformable component, and a sealing piston. The valve body has a valve cavity, a measured pressure channel, a first measurement channel, and a second measurement channel inside, all of which are connected to the valve cavity. The deformable component is disposed inside the valve cavity and is used to drive the sealing piston to move along a first direction when the gas pressure inside the valve cavity changes. The deformable component has a reset state and a deformed state. When the gas pressure delivered to the valve cavity by the measured pressure channel exceeds a threshold, the deformable component switches from the reset state to the deformed state. When the deformable component is in the reset state, the measured pressure channel is connected to the first measurement channel; when the deformable component is in the deformed state, the measured pressure channel is isolated from the first measurement channel. The first direction is parallel to the length direction of the valve cavity.

[0018] Thus, when the gas pressure in the measured pressure channel is high, the deformable part deforms under the action of gas pressure and drives the sealing piston to move, thus isolating the measured pressure channel from the first measuring channel. This prevents high-pressure gas from entering the low-range pressure gauge through the first measuring channel and damaging it. The high-pressure gas is then guided into the second measuring channel to be measured by the high-range pressure gauge, maintaining measurement accuracy. After the gas pressure in the valve chamber drops, the deformable part resets and drives the sealing piston to reset, restoring the connection between the measured pressure channel and the first measuring channel. This enables the automatic selection of pressure gauges with different ranges based on gas pressure, avoiding the difficulty of a single-range pressure gauge adapting to changes in operating conditions. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of an automatic gas pressure range switching device in one embodiment of the present invention.

[0020] In the picture:

[0021] 1. Valve body; 11. Valve chamber; 111. First chamber; 112. Second chamber; 113. Third chamber; 12. Measuring pipe connector; 121. Measured pressure channel; 13. First measuring connector; 131. First measuring channel; 14. Second measuring connector; 141. Second measuring channel; 15. Receiving groove; 2. Deformable component; 3. Sealing piston; 31. Piston rod; 4. Elastic component; 5. Adjusting component; 51. Vent hole; X, First direction; Y, Second direction. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0023] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0026] See Figure 1 This utility model provides an automatic gas pressure range switching device, including a valve body 1, a deformable component 2, and a sealing piston 3. The valve body 1 has a valve cavity 11, a measured pressure channel 121, a first measuring channel 131, and a second measuring channel 141 inside. The measured pressure channel 121, the first measuring channel 131, and the second measuring channel 141 are all connected to the valve cavity 11. The deformable component 2 is disposed inside the valve cavity 11 and is used to drive the sealing piston 3 to move along the first direction X when the gas pressure inside the valve cavity 11 changes. The deformable component 2 has a reset state and a deformed state. After the gas pressure delivered to the valve cavity 11 by the measured pressure channel 121 exceeds a threshold, the deformable component 2 switches from the reset state to the deformed state. When the deformable component 2 is in the reset state, the measured pressure channel 121 is connected to the first measuring channel 131. When the deformable component 2 is in the deformed state, the measured pressure channel 121 is isolated from the first measuring channel 131. The first direction X is parallel to the length direction of the valve cavity 11.

[0027] In this embodiment, the valve cavity 11 is disposed through the valve body 1 along the first direction X. The second measuring channel 141 is coaxially disposed with the valve body 1. The extension directions of the measured pressure channel 121 and the first measuring channel 131 are parallel. The deformable member 2 is disposed in the middle of the valve cavity 11. When the deformable member 2 is converted from the reset state to the deformed state under the action of gas pressure, the sealing piston 3 moves along the first direction X toward the direction close to the first measuring channel 131 and isolates the measured pressure channel 121 from the first measuring channel 131, so that gas can only flow into the second measuring channel 141. The outlet of the first measuring channel 131 is connected to a low-range pressure gauge (not shown in the figure), and the outlet of the second measuring channel 141 is connected to a high-range pressure gauge (not shown in the figure).

[0028] It should be noted that when the deformable part 2 is in the reset state, the gas delivered to the valve chamber 11 through the pressure being measured 121 can enter the first measuring channel 131 and be measured by the low-range pressure gauge. When the gas pressure delivered to the valve chamber 11 through the pressure being measured 121 exceeds the threshold, the deformable part 2 deforms and switches to the deformed state, so that the sealing piston 3 isolates the first measuring channel 131 from the pressure being measured 121, and allows the gas to enter the second measuring channel 141 and be measured by the high-range pressure gauge, so as to realize the selection of an appropriate pressure gauge for measurement according to the gas pressure.

[0029] Thus, when the gas pressure in the valve chamber 11 is high, the deformable part 2 can deform under the action of gas pressure and drive the sealing piston 3 to move. This allows the sealing piston 3 to cut off the connection between the measured pressure channel 121 and the first measuring channel 131, preventing high-pressure gas from contacting the low-range pressure gauge through the first measuring channel 131 and damaging it. It can also guide the high-pressure gas into the second measuring channel 141, where it can be measured by the corresponding high-range pressure gauge. When the gas pressure is low, the deformable part 2 resets and drives the sealing piston 3 to reset, restoring the connection between the measured pressure channel 121 and the first measuring channel 131. This maintains measurement accuracy and enables automatic selection of the low-range or high-range pressure gauge based on the gas pressure, avoiding the difficulty of a single-range pressure gauge adapting to changes in operating conditions.

[0030] See Figure 1 In some embodiments, the valve body 1 is connected to a measuring pipe connector 12, a first measuring connector 13, and a second measuring connector 14. The pressure to be measured is 121, which is opened in the measuring pipe connector 12. The first measuring channel 131 is opened in the first measuring connector 13, and the second measuring channel 141 is opened in the second measuring connector 14. The measuring pipe connector 12 and the first measuring connector 13 are respectively located on both sides of the second measuring connector 14 in the second direction Y. The second direction Y is perpendicular to the first direction X.

[0031] In this embodiment, the measuring pipe joint 12, the first measuring joint 13, and the second measuring joint 14 are fixedly installed on the valve body 1. The second measuring channel 141 extends along the first direction X, and the measured pressure channel 121 and the first measuring channel 131 both extend along the second direction Y.

[0032] Thus, the measuring pipe connector 12, the first measuring connector 13, and the second measuring connector 14 are respectively connected to the pipe being measured, the low-range pressure gauge, and the high-range pressure gauge, so that the gas can flow to the corresponding pressure gauge according to the preset path under different working conditions. The first measuring channel 131 and the second measuring channel 141 are set perpendicular to each other, which can facilitate the selective isolation of the first measuring channel 131 by the sealing piston 3, and facilitate the change of the gas flow direction. When the gas pressure in the valve chamber 11 exceeds the threshold, the gas can be quickly guided to the second measuring channel 141, reducing the impact and interference on the low-range pressure gauge and improving the reliability of the automatic gas pressure range switching device.

[0033] See Figure 1 In some embodiments, the sealing piston 3 is connected to a piston rod 31, and the two ends of the piston rod 31 are respectively connected to the sealing piston 3 and the deformable member 2, and the piston rod 31 extends along the first direction X.

[0034] In this embodiment, the piston rod 31 is fixedly connected to the sealing piston 3. When the deformable member 2 changes from the reset state to the deformed state, the deformable member 2 drives the piston rod 31 and the sealing piston 3 to move in the direction away from the second measuring channel 141, and causes the sealing piston 3 to block the measured pressure channel 121 and the first measuring channel 131, so as to guide the gas to the second measuring channel 141 for discharge.

[0035] Furthermore, the sealing piston 3 can be made of materials with a certain degree of elasticity, such as rubber or silicone, which can buffer the sealing piston 3 when it comes into contact with the inner wall of the valve cavity 11 and improve the sealing performance, preventing high-pressure gas from entering the first measuring channel 131.

[0036] Thus, by moving the piston rod 31 and the sealing piston 3 through the deformable part 2, the flow direction of the gas can be guided, so that the low-pressure gas enters the first measuring channel 131 and the high-pressure gas enters the second measuring channel 141, realizing the rapid switching of the gas flow path. This allows the pressure gauge with different ranges to be automatically selected when the working conditions change, ensuring the normal operation of the low-range pressure gauge while ensuring the accuracy of the measurement results.

[0037] It is understandable that the sealing piston 3 can also be directly connected to the deformable part 2. In this embodiment, the piston rod 31 is set in order to make reasonable use of the space inside the valve cavity 11 so that the sealing piston 3 has enough room to move in the valve cavity 11. The connection method between the sealing piston 3 and the deformable part 2 can be adjusted according to actual needs, and will not be listed in detail here.

[0038] See Figure 1 In some embodiments, the automatic gas pressure range switching device further includes an elastic element 4 connected to the deformable member 2. The elastic element 4 is disposed on the side of the deformable member 2 away from the sealing piston 3, so that the deformable member 2 switches between a reset state and a deformed state. Further, the elastic element 4 is a spring that extends along a first direction X.

[0039] In this embodiment, when the deformable member 2 is in the reset state, the spring is in the natural state. When the gas pressure in the valve chamber 11 exceeds the threshold, the deformable member 2 overcomes the spring pressure and generates displacement. When the deformable member 2 changes from the reset state to the deformed state, the spring is compressed as the deformable member 2 moves in the direction away from the second measuring channel 141. When the gas pressure in the valve chamber 11 drops below the threshold, the spring releases the stored elastic potential energy and pushes the deformable member 2 back to the reset state, so that the measured pressure channel 121 is reconnected with the first measuring channel 131.

[0040] Thus, by setting a spring connected to the deformable part 2, the deformable part 2 can return to the reset state under the action of the spring after the gas pressure drops, so as to automatically switch the pressure gauge of different range according to the gas pressure, improve the automation and accuracy of measurement, reduce the risk of measurement errors and equipment damage caused by manual operation, and extend the service life of low-range pressure gauges.

[0041] It is understandable that the elastic element 4 can also be a connecting column, airbag or other structure made of elastic material that can stretch or contract along the first direction X, as long as it can achieve elastic connection with the deformable element 2, and will not be listed in detail here.

[0042] See Figure 1 In some embodiments, the automatic gas pressure range switching device further includes an adjusting member 5, which is connected to the elastic member 4 and is used to adjust the magnitude of the force exerted by the elastic member 4 on the deformable member 2. Further, in some embodiments, the adjusting member 5 is an adjusting screw, which is threadedly connected to the valve body 1 and coaxially arranged with the valve cavity 11.

[0043] In this embodiment, the adjusting screw is threaded to one end of the valve body 1 away from the second measuring channel 141. The two ends of the spring are fixedly connected to the surface of the adjusting screw facing the deformable part 2 and the surface of the deformable part 2 facing the adjusting screw, respectively. A vent hole 51 is provided on the adjusting screw, which is coaxially arranged with the valve cavity 11, so that the valve cavity 11 on the side of the deformable part 2 away from the sealing piston 3 is connected to the outside atmosphere.

[0044] Thus, by changing the relative position of the adjusting screw and the valve body 1, the force applied by the spring to the deformable part 2 can be precisely adjusted, thereby adjusting the gas pressure threshold that causes the deformable part 2 to deform, enabling it to flexibly adapt to different gas types and pressure thresholds, improving the flexibility and reliability of the automatic gas pressure range switching device, and increasing measurement accuracy; the valve chamber 11 is connected to the outside through the vent 51, ensuring the normal operation of the automatic gas pressure range switching device under different ambient air pressures.

[0045] It is understood that the adjusting component 5 can also be a slider that is slidably set in the valve cavity 11 and fixed in position on the valve body 1 by a fixing pin. The spring can also be fixedly connected to the valve body 1 so that the elastic pressure acting on the deformable component 2 remains unchanged. In this embodiment, the adjusting screw is provided so that the automatic gas pressure range switching device can adapt to more working conditions and facilitate limiting the relative position of the adjusting screw and the valve body 1. The connection method between the spring and the valve body 1 can be adjusted according to actual needs, which will not be elaborated here.

[0046] See Figure 1 In some embodiments, the valve chamber 11 includes a first chamber 111, a second chamber 112, and a third chamber 113. Along the first direction X, the first chamber 111, the second chamber 112, and the third chamber 113 are arranged sequentially. The first chamber 111 is connected to the pressure channel 121 to be measured and the second measurement channel 141. The second chamber 112 is connected to the first measurement channel 131. The third chamber 113 is connected to the outside. When the deformable member 2 is in the reset state, the first chamber 111 is connected to the second chamber 112. When the deformable member 2 is in the deformed state, the first chamber 111 is isolated from the second chamber 112.

[0047] In this embodiment, the first chamber 111 is the position where the valve chamber 11 is located corresponding to the second measuring channel 141. The sealing piston 3 moves in the first chamber 111, and the piston rod 31 is located inside the second chamber 112. The deformable member 2, the elastic member 4, and the adjusting member 5 are all located in the third chamber 113. The cross-sectional area of ​​the end of the first chamber 111 facing the second chamber 112 is smaller than the cross-sectional area of ​​the end facing away from the second chamber 112. The cross-sectional area of ​​the sealing piston 3 is larger than the cross-sectional area of ​​the end of the first chamber 111 facing the second chamber 112. When the deformable member 2 is in a deformed state, the sealing piston 3 can cover the connection between the first chamber 111 and the second chamber 112 and isolate the measured pressure channel 121 from the first measuring channel 131, so that the high-pressure gas can flow into the second measuring channel 141 and be measured by the high-range pressure gauge. The maximum cross-sectional area of ​​the first chamber 111 and the cross-sectional area of ​​the second chamber 112 are both smaller than the cross-sectional area of ​​the third chamber 113.

[0048] Thus, when the deformable part 2 is in the reset state, the sealing piston 3 is located inside the first chamber 111. The gas that enters the valve chamber 11 through the measured pressure channel 121 can enter the second chamber 112 and the first measuring channel 131 and be measured by the low-range pressure gauge. When the deformable part 2 is in the deformed state, since the sealing piston 3 blocks the connection between the first chamber 111 and the second chamber 112, the high-pressure gas changes its flow direction and enters the second measuring channel 141, realizing the rapid switching of pressure gauges with different ranges, extending the service life of the low-range pressure gauge, and maintaining the accuracy of measurement. The third chamber 113 has enough space to assemble the deformable part 2, the elastic part 4, and the adjusting part 5, avoiding interference with the sealing piston 3 and affecting the measurement effect, thereby improving the reliability and safety of the automatic gas pressure range switching device.

[0049] See Figure 1 In some embodiments, the deformable element 2 is a diaphragm, which is coaxially arranged with the valve cavity 11. Further, in some embodiments, the valve body 1 has a receiving groove 15 communicating with the valve cavity 11, and the diaphragm is fitted into the receiving groove 15.

[0050] In this embodiment, the cross-sectional area of ​​the membrane is larger than the cross-sectional area of ​​the third cavity 113.

[0051] Thus, the diaphragm is elastic and has sealing properties, and can automatically deform when the gas pressure inside the valve chamber 11 increases, improving the sensitivity to changes in gas pressure and quickly driving the sealing piston 3 to move, realizing the rapid switching of pressure gauges with different ranges, improving the measurement sensitivity and response capability of the automatic gas pressure range switching device. The receiving groove 15 can stably set the diaphragm in the third chamber 113, avoiding it from falling off due to gas pressure, which would cause the automatic gas pressure range switching device to fail.

[0052] It is understandable that the modified part 2 can also be a structure such as a pneumatic spring or bellows that can drive the sealed piston 3 to move when the gas pressure changes. The specific structure of the modified part 2 can be adjusted according to actual needs, and will not be listed in detail here.

[0053] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An automatic gas pressure range switching device, characterized in that, include: The valve body (1) has a valve cavity (11), a pressure channel (121) to be measured, a first measuring channel (131) and a second measuring channel (141) inside the valve body (1). The pressure channel (121), the first measuring channel (131) and the second measuring channel (141) are all connected to the valve cavity (11). The deformable part (2) and the sealing piston (3) are provided inside the valve chamber (11) and are used to drive the sealing piston (3) to move along the first direction (X) when the gas pressure inside the valve chamber (11) changes. The deformable part (2) has a reset state and a deformed state. After the gas pressure delivered to the valve chamber (11) by the measured pressure channel (121) exceeds the threshold, the deformable part (2) switches from the reset state to the deformed state. When the deformable part (2) is in the reset state, the measured pressure channel (121) is connected to the first measuring channel (131). When the deformable part (2) is in the deformed state, the measured pressure channel (121) is isolated from the first measuring channel (131). The first direction (X) is parallel to the length direction of the valve cavity (11).

2. The automatic gas pressure range switching device according to claim 1, characterized in that, The valve body (1) is connected to a measuring pipe connector (12), a first measuring connector (13), and a second measuring connector (14). The pressure channel to be measured (121) is opened at the measuring pipe connector (12), the first measuring channel (131) is opened at the first measuring connector (13), and the second measuring channel (141) is opened at the second measuring connector (14). The measuring pipe connector (12) and the first measuring connector (13) are respectively located on both sides of the second measuring connector (14) in the second direction (Y). The second direction (Y) is perpendicular to the first direction (X).

3. The automatic gas pressure range switching device according to claim 1, characterized in that, The sealing piston (3) is connected to a piston rod (31), and the two ends of the piston rod (31) are respectively connected to the sealing piston (3) and the deformable part (2), and the piston rod (31) extends along the first direction (X).

4. The automatic gas pressure range switching device according to claim 1, characterized in that, The automatic gas pressure range switching device further includes an elastic element (4) connected to the deformable element (2). The elastic element (4) is disposed on the side of the deformable element (2) away from the sealing piston (3) so that the deformable element (2) switches between the reset state and the deformed state.

5. The automatic gas pressure range switching device according to claim 4, characterized in that, The elastic element (4) is a spring that extends along the first direction (X).

6. The automatic gas pressure range switching device according to claim 4, characterized in that, The automatic gas pressure range switching device also includes an adjustment component (5), which is connected to the elastic component (4) and is used to adjust the magnitude of the force exerted by the elastic component (4) on the deformable component (2).

7. The automatic gas pressure range switching device according to claim 6, characterized in that, The adjusting component (5) is an adjusting screw, which is threaded to the valve body (1) and coaxially arranged with the valve cavity (11).

8. The automatic gas pressure range switching device according to any one of claims 1-7, characterized in that, The valve chamber (11) includes a first chamber (111), a second chamber (112), and a third chamber (113). Along the first direction (X), the first chamber (111), the second chamber (112), and the third chamber (113) are arranged in sequence. The first chamber (111) is connected to the pressure channel (121) being measured and the second measurement channel (141). The second chamber (112) is connected to the first measurement channel (131). The third chamber (113) is connected to the outside. When the deformable part (2) is in the reset state, the first chamber (111) is connected to the second chamber (112). When the deformable part (2) is in the deformed state, the first chamber (111) is isolated from the second chamber (112).

9. The automatic gas pressure range switching device according to any one of claims 1-7, characterized in that, The deformable part (2) is a diaphragm, which is coaxially arranged with the valve cavity (11).

10. The automatic gas pressure range switching device according to claim 9, characterized in that, The valve body (1) has a receiving groove (15) that communicates with the valve cavity (11), and the diaphragm is fitted into the receiving groove (15).

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