Pressure regulating device for gas tank of switch cabinet

Abstract

The utility model provides a pressure regulating device for a gas tank of a switch cabinet, a pressure sensor is connected with the gas tank of the switch cabinet, the pressure sensor is used for measuring the gas pressure of insulating gas, the pressure sensor is provided with a first pipeline, a second pipeline, a gauge outfit and a self-sealing valve, the pressure regulating device comprises a connecting assembly, the gauge head is used for being inserted into a detection port of the self-sealing valve and pushing a valve element of the self-sealing valve from a first position to a second position, and the gauge head is communicated with the pipe body when the valve element is located at the second position; and the pipe body is connected to the connector, and after the insulating gas in the first pipeline and the meter head is uniformly mixed with the gas in the pipe body, the gas pressure value of the mixed gas is smaller than the alarm value of the pressure sensor.

Description

Technical Field

[0001] This utility model relates to the field of switchgear, and in particular to a pressure regulating device for an air box in a switchgear. Background Technology

[0002] The gas chamber of a switchgear is a crucial component ensuring its normal operation. It is typically filled with insulating gas, and the pressure of this gas must be maintained at a specific level to guarantee the switchgear's proper functioning. Therefore, a pressure sensor is usually installed in the gas chamber to measure the gas pressure. When the pressure drops to a preset threshold, the pressure sensor triggers an alarm to alert personnel for timely intervention. Thus, the pressure sensor must be capable of accurately issuing alarms.

[0003] Currently, after the pressure sensor is installed in the switch cabinet, it is necessary to check whether the pressure sensor can issue an alarm normally. Utility Model Content

[0004] In view of this, the present invention proposes a pressure regulating device for a gas box in a switchgear. A pressure sensor is connected to the gas box of the switchgear. The gas box contains insulating gas. The pressure sensor is used to measure the gas pressure of the insulating gas. The pressure sensor has a first pipe, a second pipe, a meter, and a self-sealing valve. The first pipe is connected to the second pipe and the meter. The second pipe is used to connect to the gas box. The self-sealing valve includes a cavity and a valve core. The cavity is connected to the first pipe and has a detection port at one end away from the first pipe. The valve core is located in the cavity and can move between a first position and a second position. When the valve core is in the first position, the second pipe can communicate with the meter and the valve core can block the detection port. When the valve core is in the second position, it can block the communication between the meter and the second pipe.

[0005] The pressure regulating device includes a connecting assembly, which comprises:

[0006] A connector for inserting into the detection port and capable of pushing the valve core from a first position to a second position, wherein the valve core is in the second position and the meter head is in communication with the tube body;

[0007] The pipe body is connected to the connector. After the insulating gas in the first pipe and the meter is uniformly mixed with the gas in the pipe body, the gas pressure value of the mixed gas is less than the alarm value of the pressure sensor.

[0008] In this way, after the pressure sensor is installed in the switchgear, the pressure regulating device can detect whether the installed pressure sensor can issue an alarm normally, thus ensuring that the switchgear can work normally.

[0009] Optionally, according to the pressure regulating device described above, the tube body includes:

[0010] A first connecting tube is connected to the connector. When the connector is not inserted into the detection port, the first connecting tube is connected to the outside air through the connector.

[0011] Second connecting pipe;

[0012] A valve is located between the first connecting pipe and the second connecting pipe. When the valve is open, the first connecting pipe and the second connecting pipe are connected. When the valve is closed, the valve can block the connection between the first connecting pipe and the second connecting pipe.

[0013] This ensures that the pressure of the mixed gas is slightly lower than the alarm value of the pressure sensor.

[0014] According to the pressure regulating device described above, the first connecting pipe and the second connecting pipe can optionally be made of copper or stainless steel. Using such rigid pipes eliminates the risk of gas leakage due to thermal expansion and contraction of the pipe body during temperature changes.

[0015] Optionally, according to the pressure regulating device described above, the first connecting pipe is connected to the connector by a nut. This connection method is convenient and quick.

[0016] Optionally, the pressure regulating device described above may also include a locking assembly for pushing the connector into the first pipe. This pushing method of inserting the connector into the first pipe is suitable for use in confined spaces.

[0017] Optionally, according to the pressure regulating device described above, the locking assembly includes:

[0018] A positioning element that can be fixed to the pressure sensor;

[0019] A rotating component, rotatably connected to the positioning component, which, during rotation, can push the connecting assembly to move along the direction of insertion into the self-sealing valve.

[0020] The combination of positioning and rotating parts allows operators to push the connector into the self-sealing valve with less force in a smaller space.

[0021] Optionally, according to the pressure regulating device described above, the first end of the positioning member can be engaged with the pressure sensor, and the connecting assembly can be movably inserted through the second end of the positioning member. This also limits the direction of movement of the connecting assembly, facilitating the correct insertion of the connector into the self-sealing valve.

[0022] Optionally, according to the pressure regulating device described above, the free end of the rotating component has a groove, and the sides of the groove are provided with inclined surfaces. During the rotation of the rotating component, the inclined surfaces can push the connecting assembly to move in the direction of insertion into the self-sealing valve, so that the connector is inserted into the detection port and pushes the valve core to the second position. Using inclined surfaces to push the connecting assembly has a simple structure and high reliability.

[0023] Optionally, according to the pressure regulating device described above, the pressure sensor further includes an elastic element sleeved on the valve core, the elastic element being capable of providing a restoring force to the valve core to move to a first position.

[0024] Optionally, the connector is fitted with a sealing ring, as described above, to prevent gas leakage.

[0025] According to the pressure regulating device described above, optionally, the first pipe has a first sub-pipe and a second sub-pipe, the first sub-pipe is connected to the second pipe, the second sub-pipe is connected to the first sub-pipe and the meter head respectively, when the valve core is in the first position, the first sub-pipe is connected to the second sub-pipe, when the valve core is in the second position, the connection between the first sub-pipe and the second sub-pipe can be blocked, and the second sub-pipe can be connected to the connecting assembly inserted into the detection port. Attached Figure Description

[0026] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can more clearly understand the above and other features and advantages of the present invention, in which:

[0027] Figure 1 This is a structural schematic diagram of a pressure regulating device according to an embodiment of the present invention under one state.

[0028] Figure 2 This is a structural schematic diagram of a pressure regulating device under another state according to another embodiment of the present invention.

[0029] Figure 3 This is a cross-sectional schematic diagram of a pressure sensor.

[0030] Figure 4 This is a schematic diagram of the connection components of the pressure regulating device.

[0031] The accompanying figure is labeled as follows:

[0032] 1-First Pipeline

[0033] 11-First Sub-pipe

[0034] 12-Second Sub-pipe

[0035] 2-Second Pipeline

[0036] 3-Table Header

[0037] 4-Self-sealing valve

[0038] 40-Cavity

[0039] 41-Valve Core

[0040] 42-Detection port 43-Elastic element

[0041] 5-Connector

[0042] 51-Sealing ring

[0043] 6-Connection Components

[0044] 61-First connecting pipe

[0045] 62-Second connecting pipe

[0046] 63-Valve

[0047] 64-nut

[0048] 7-Positioning component

[0049] 8-Rotating component

[0050] 81-groove

[0051] 82-Bevel

[0052] 83-handle Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of this utility model clearer, the following embodiments are provided to further illustrate this utility model in detail. The nouns and pronouns referring to "person" in this patent application are not limited to specific genders.

[0054] This invention provides a pressure regulating device for a gas box in a switchgear, wherein the pressure sensor is used to measure the gas pressure of the insulating gas in the gas box. The insulating gas can be sulfur hexafluoride or a clean gas.

[0055] like Figures 1 to 3As shown, the pressure sensor has a first pipe 1, a second pipe 2, a gauge 3, and a self-sealing valve 4. The first pipe 1 is connected to both the second pipe 2 and the gauge 3, and the self-sealing valve 4 is connected to one end of the first pipe 1. The self-sealing valve 4 includes a cavity 40 and a valve core 41. One end of the cavity 40 is connected to the first pipe 1, and the end of the cavity 40 away from the first pipe 1 has a detection port 42. The valve core 41 is located in the cavity and can move between a first position and a second position. When the valve core 41 is in the first position, the gauge 3 is connected to the second pipe 2, and the valve core 41 can block the detection port 42. Due to the self-sealing effect of the self-sealing valve 4, gas will not leak out from the detection port 42. When the valve core 41 is in the second position, it can block the connection between the gauge 3 and the second pipe 2. The second pipe 2 is used to connect to a gas tank. Meter 3 is connected to the gas box via the second pipe 2, allowing it to measure the pressure of the insulating gas in the gas box. The self-sealing valve 4 blocks the connection between meter 3 and the second pipe 2, indicating that meter 3 can no longer measure the pressure of the gas insulator in the gas box. Figure 3 As can be seen, when the valve core 41 is in the second position, the valve core 41 does not block the detection port 42, so that the detection port 42 is in the open state, and the first pipe 1 is connected to the component inserted into the detection port 42.

[0056] Normally, the pressure of the insulating gas in the gas chamber is higher than atmospheric pressure. When the pressure of the insulating gas drops below the specified functional pressure, the pressure sensor will issue an alarm. The functional pressure here refers to the minimum pressure of the insulating gas required for the gas chamber to operate normally.

[0057] As an example, such as Figure 3 As shown, the meter 3 here may include a third pipe 31, a pressure measuring element 32 and a display panel 33. The first pipe 1 is connected to the third pipe 31. The pressure measuring element 32 can measure the pressure value of the gas in the third pipe 31 and then display it through the display panel 33.

[0058] More specifically, such as Figure 3 The diagram shows a cross-sectional view of the pressure regulating device with the valve core of the self-sealing valve in the second position. In its natural state, the valve core 41 is in the first position, and the self-sealing valve 4 is in a sealed state. When the valve core 41 is in the first position, the two sub-pipes in the first pipe 1 are connected. These two sub-pipes are the first sub-pipe 11 and the second sub-pipe 12, as shown... Figure 3As shown, the first sub-pipe 11 is an inner pipe located within the second sub-pipe 12. The first sub-pipe 11 is connected to the second pipe 2; specifically, one end of the first sub-pipe 11 is connected to the second pipe 2, and the other end is connected to the second sub-pipe 12. The second sub-pipe 12 is connected to the meter 3. Thus, with the first sub-pipe 11 and the second sub-pipe 12 connected, it is equivalent to the second pipe 2 being connected to the meter 3, and the detection port 42 is blocked. When the valve core 41 is in the second position, the first sub-pipe 11 connected to the first pipe 1 is blocked, which means the connection between the first sub-pipe 11 and the second sub-pipe 12 is broken, thereby blocking the connection between the meter 3 and the second pipe 2, and the detection port 24 is opened. Figure 3 As can be seen, when the valve core 41 is in the second position, the second sub-pipe 12 is connected to the component connected to the first pipe 1. Figure 3 The dashed line L in the diagram represents the gas connection between the first sub-pipe 11 and the second pipe 2. (See diagram for example.) Figure 1 and Figure 2 As shown, the component connected to the first pipe 1 is the connecting assembly 6. The pipe body may contain air. Since the pressure of the insulating gas is higher than the atmospheric pressure of air, the insulating gas in the second sub-pipe 12 will enter the component connected to the first pipe 1 and thus mix.

[0059] like Figures 1 to 3 As shown, the pressure regulating device includes a connecting assembly 6, which includes a connector 5 and a pipe body.

[0060] The connector 5 is inserted into the detection port 42 and can push the valve core 41 from a first position to a second position. When the valve core 41 is in the second position, the meter 3 is connected to the pipe body. The pipe body is connected to the connector 5. After the insulating gas in the first pipe 1 and the meter 3 is uniformly mixed with the gas in the pipe body, the pressure value of the mixed gas is less than the alarm value of the pressure sensor. Here, the alarm value can be a specified functional pressure value.

[0061] For example, connector 5 can be connected to the pipe body via a sealing connection component, such as... Figure 4 The nut 64 is shown. Of course, other connecting parts can also be used for connection, which will not be elaborated here.

[0062] The pressure of the gas in the pipe must be lower than the alarm value of the pressure sensor to ensure that the pressure of the mixed gas is also lower than the alarm value. Since gauge 3 is connected to the gas box first, it contains insulating gas. Correspondingly, insulating gas is also present in the first pipe 1. With valve core 41 in the second position, the pipe is connected to gauge 3 through the first pipe 1. After the gas in the first pipe 1, gauge 3, and pipe is mixed evenly, its pressure is lower than the sensor's alarm value. Gauge 3 can directly measure the pressure of the mixed gas in the pipe. Therefore, under normal operating conditions, the pressure sensor can directly issue an alarm, thus completing the detection of the pressure sensor. If the pressure sensor fails to issue an alarm, it indicates that the pressure sensor is malfunctioning and needs to be replaced.

[0063] Optionally, such as Figure 4 As shown, a sealing ring 51 is fitted onto the connector 5. This sealing ring 51 prevents gas leakage from the connector 5 when it is inserted into the detection port 42 of the self-sealing valve 4. The number of sealing rings 51 can be selected according to actual needs, such as... Figure 4 As shown, it has two sealing rings 51.

[0064] In this way, after the pressure sensor is installed in the switchgear, the pressure regulating device can detect whether the installed pressure sensor can issue an alarm normally, thus ensuring that the switchgear can work normally.

[0065] As an example, such as Figure 4As shown, the tube body includes a first connecting pipe 61, a second connecting pipe 62, and a valve 63. The first connecting pipe 61 is connected to a connector 5. When the pressure sensor is not inserted into the connector 5, the first connecting pipe 61 is connected to the outside air. The valve 63 is located between the first connecting pipe 61 and the second connecting pipe 62. When the valve 63 is open, the first connecting pipe 61 and the second connecting pipe 62 are connected. When the valve 63 is closed, the valve 63 can block the connection between the first connecting pipe 61 and the second connecting pipe 62. In practical use, the valve 63 can be opened first, connecting the first connecting pipe 61 and the second connecting pipe 62, with the gas pressure equal to atmospheric pressure. Then, the valve 63 is closed, and the connector 5 is inserted into the detection port 42, pushing the valve core 41 from the first position to the second position. Next, open valve 63, allowing the second connecting pipe 62 to connect with the first connecting pipe 61. The insulating gas in the first connecting pipe 61 and gauge 3 mixes with the air in the first connecting pipe 61 and the second connecting pipe 62. The pressure of the mixed gas is slightly lower than the alarm value of the pressure sensor. At this time, gauge 3 measures the pressure of the mixed gas in the pipe. Since the pressure of the mixed gas in the pipe is slightly lower than the alarm value of the pressure sensor, the pressure sensor should issue an alarm, and the detection ends. If the pressure sensor does not issue an alarm, the operator can proceed with the investigation. Figure 1As can be seen, after the pressure sensor is connected to the gas box, a portion of the insulating gas in the gas box reaches the first pipe 1, the second pipe 2, and the gauge 3 of the pressure sensor. After the self-sealing valve 4 blocks the gas box from the gauge 3 and connects the pipe body to the gauge 3, the insulating gas in the first pipe 1 and the gauge 3 fills the pipe body and mixes with the air in the pipe body. As for how to make the mixed gas slightly lower than the alarm value of the pressure sensor, it can be done by calculating the length of the second sub-pipe 12 in the pressure sensor and the third pipe 31 in the gauge 3 relative to the pressure of the insulating gas, the length of the first connecting pipe 61 relative to the gas pressure, and the length of the second connecting pipe 62 relative to the gas pressure, and setting the first connecting pipe 61 and the second connecting pipe 62 to appropriate lengths, thereby making the pressure value of the mixed gas slightly lower than the alarm value of the pressure sensor. The specifics will not be elaborated further. In addition, a valve 63 is installed on the pipe body. When the pressure sensor is not inserted into the connector 5, the valve 63 can be opened to fill both the first connecting pipe 61 and the second connecting pipe 62 with air. Then, the valve 63 is closed, the connector 5 is inserted into the pressure sensor, and the self-sealing valve 4 is pushed to the second position. Then, the valve 63 is opened again to mix the gases in the second sub-pipe 12, the third pipe 31, the first connecting pipe 61, and the second connecting pipe 62. After the measurement is completed, the valve 63 is closed, the connector 5 is removed from the pressure sensor, and the self-sealing valve 4 is reset to the first position. Before the next use, the valve 63 can be opened again and the above operation is repeated. It can be seen that the function of the valve 63 is to prevent insulating gas from filling the entire pipe body during the process of pushing the valve core 41 to move.

[0066] As an example, the first connecting pipe 61 and the second connecting pipe 62 are rigid pipes, specifically copper or stainless steel pipes. Using such rigid pipes eliminates the risk of gas leakage due to thermal expansion and contraction of the pipe body during temperature changes.

[0067] Due to the limited space in the switch cabinet, ensuring the smooth insertion of the connecting component 6 into the first pipe 1 became a pressing issue. Using a traditional wrench to tighten the connection between the connecting component 6 and the first pipe 1 was inconvenient and prone to failure, leading to air leaks. Therefore, the inventors also provided a locking component, which is used to push the connector 5 into the first pipe 1.

[0068] As an example, the locking assembly includes a positioning element 7 and a rotating element 8. The positioning element 7 is fixed to the pressure sensor. The rotating element 8 is rotatably connected to the positioning element 7, and during rotation, it pushes the connecting assembly 6 along the direction of insertion into the first pipe 1. The cooperation of the positioning element 7 and the rotating element 8 allows the operator to push the connector 5 into the self-sealing valve 4 with less force and in a smaller space. More specifically, the first end of the positioning element 7 can be engaged with the pressure sensor, and the connecting assembly 6 can pass through the second end of the positioning element 7. This also limits the direction of movement of the connecting assembly 6, facilitating the correct insertion of the connector 5 into the self-sealing valve 4.

[0069] As a further example, the free end of the rotating member 8 has a groove 81, and inclined surfaces 82 are provided on both sides of the groove 81. During the rotation of the rotating member 8, the inclined surfaces 82 can push the connecting assembly 6 to move in the direction of insertion into the first pipe 1, so that the connector 5 is inserted into the detection port 42, and pushes the valve core 41 from the first position to the second position. The rotating member 8 rotates around an axis, and the free end here is the end away from the axis. Figure 1 and Figure 2 As shown, the groove 81 is used to avoid the pipe body. Inclined surfaces 82 are provided on the inner sidewalls of both sides of the groove 81. As the rotating component 8 rotates, the inclined surfaces 82 contact the connecting assembly 6, specifically as follows... Figure 1 and Figure 2 As shown, the inclined surface 82 contacts the nut 64 between the first connecting pipe 61 and the connector 5, and pushes the nut 64 so that the connector 5 is inserted into the detection port 42, and the connector 5 pushes the valve core 41 to the second position. Figure 1 A schematic diagram showing the structure where the positioning element 8 does not contact the nut 64 is shown. Figure 2 The diagram shows a structure in which the positioning element 8 pushes the connector 5 into the detection port 42, causing the connector 5 to push the valve core 41 to the second position. The structure and length of the inclined plane 82, as well as the stroke of each moving or rotating component, can be determined by calculation and will not be elaborated here. Using the inclined plane 82 to push the connecting assembly results in a simple structure and high reliability.

[0070] As an example, the pressure sensor also includes an elastic element 43, which is sleeved on the valve core 41. The elastic element 43 provides a restoring force to move the valve core 41 to a first position. That is, the elastic element 43 enables the self-sealing valve 4 to be in a sealed state. The elastic element 43 may be a spring. After the test is completed, the rotating component 8 is rotated so that the sidewall of the groove 81 gradually moves away from the connecting assembly 6. The operator can then directly pull the connector 5 out of the self-sealing valve 4. During this process, under the action of the elastic element 43, the elastic element 43 moves from the second position to the first position, so that the gauge 3 can continue to measure the pressure of the gas in the gas box.

[0071] The working principle of the aforementioned pressure regulating device is described in detail below. The pressure sensor is connected to the gas tank of the switchgear, and the gas tank is filled with insulating gas. The valve core of the self-sealing valve 4 is in the first position. The first sub-pipe 11 and the second sub-pipe 12 are connected. The first sub-pipe 11, the second sub-pipe 12, the second pipe 2, and the third pipe 31 are all filled with insulating gas from the gas tank. The meter 3 displays the pressure of the insulating gas in the gas tank.

[0072] The operator opens valve 63 on the pipe body, connecting the first connecting pipe 61 and the second connecting pipe 62. The first connecting pipe 61 is connected to the outside air through connector 5, thus filling both the first connecting pipe 61 and the second connecting pipe 62 with air to reach atmospheric pressure. Next, valve 63 is closed.

[0073] Then, fix the positioning element 7 onto the pressure sensor, specifically as follows: Figure 1 As shown, one end of the positioning component 7 is engaged with the first pipe 1 of the pressure sensor. Then, the connecting assembly 6 is inserted into the through hole at the other end of the positioning component 7, causing the connector 5 to be inserted into the detection port 42. At this point, the locking assembly does not apply force to the connecting assembly 6, and the valve core 41 is in the first position. Figure 1 The diagram shows the state of the pressure regulating device when the valve core 41 is in the first position.

[0074] Next, the operator holds handle 83 and rotates rotating component 8, causing the free end of rotating component 8 to gradually approach the nut 64 between connector 5 and first connecting pipe 61. After the free end of rotating component 8 contacts nut 64, the operator continues to rotate rotating component 8, causing inclined surface 82 to push nut 64 towards detection port 42, thereby causing connector 5 to be inserted into detection port 42 and pushing valve core 4 from the first position to the second position. Figure 2 and Figure 3 As shown. Figure 2 The diagram shows the state of the pressure regulating device when the valve core is in the second position. At this time, the first sub-pipe 11 and the second sub-pipe 12 are blocked, while the second sub-pipe 12 remains connected to the gauge 3. The second sub-pipe 12 is also connected to the component inserted into the detection port 42, meaning the second sub-pipe 12 is connected to the pipe body via the connector 5. Therefore, the pressure sensor measures the pressure of the gas inside the pipe body. Although there may be some insulating gas in the second sub-pipe 12 and the gauge 3, by calculating the lengths of the first connecting pipe 61 and the second connecting pipe 62, the pressure after mixing the gas in the pipe body, the second sub-pipe 12, and the gauge 3 can be made less than the threshold for the pressure sensor to issue an alarm. Thus, the pressure sensor can issue an alarm, and the detection is successful.

[0075] Then, rotate the rotating part 8 in the opposite direction so that the inclined surface 82 gradually moves away from the nut 64, and the operator can pull the connector 5 out of the detection port 42. Under the action of the reset part, the valve core 41 returns from the second position to the first position, so that the first sub-pipe 11 and the second sub-pipe 12 are reconnected, and the self-sealing valve 4 blocks the detection port 42, and the air box and the meter 3 are reconnected.

[0076] When testing is required again, simply reopen the valve on pipe 63 to restore the gas pressure in the pipe to atmospheric pressure, and repeat the above steps.

[0077] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pressure regulating device for a gas box in a switchgear, wherein a pressure sensor is connected to the gas box of the switchgear, the gas box contains insulating gas, the pressure sensor is used to measure the gas pressure of the insulating gas, the pressure sensor has a first pipe (1), a second pipe (2), a gauge (3) and a self-sealing valve (4), the first pipe (1) is connected to the second pipe (2) and the gauge (3) respectively, the second pipe (2) is used to connect to the gas box, the self-sealing valve (4) includes a cavity (40) and a valve core (41), the cavity (40) The valve core (41) is connected to the first pipe (1) and has a detection port (42) at one end away from the first pipe (1). The valve core (41) is located in the cavity (40) and can move between a first position and a second position. When the valve core (41) is in the first position, the second pipe (2) can communicate with the meter (3) and the valve core (41) can block the detection port (42). When the valve core (41) is in the second position, it can block the communication between the meter (3) and the second pipe (2). Its features are, The pressure regulating device includes a connecting assembly (6), which comprises: Connector (5), which is used to insert into the detection port (42) and can push the valve core (41) from the first position to the second position. When the valve core (41) is in the second position, the meter (3) is in communication with the tube body; The pipe body is connected to the connector (5). After the insulating gas in the first pipe (1) and the meter (3) is uniformly mixed with the gas in the pipe body, the gas pressure value of the mixed gas is less than the alarm value of the pressure sensor.

2. The pressure regulating device according to claim 1, characterized in that, The tube body includes: The first connecting tube (61) is connected to the connector (5). When the connector (5) is not inserted into the detection port (42), the first connecting tube (61) is connected to the outside air through the connector (5). Second connecting pipe (62); A valve (63) is located between the first connecting pipe (61) and the second connecting pipe (62). When the valve (63) is open, the first connecting pipe (61) and the second connecting pipe (62) are connected. When the valve (63) is closed, the valve (63) can block the connection between the first connecting pipe (61) and the second connecting pipe (62).

3. The pressure regulating device according to claim 2, characterized in that, The first connecting pipe (61) and the second connecting pipe (62) are made of copper or stainless steel; and / or The first connecting pipe (61) is connected to the connector (5) by a nut (64).

4. The pressure regulating device according to claim 1, characterized in that, Also includes: A locking assembly for pushing the connector (5) into the first pipe (1).

5. The pressure regulating device according to claim 4, characterized in that, The locking assembly includes: Positioning element (7) which can be fixed to the pressure sensor; A rotating component (8) is rotatably connected to the positioning component (7). During rotation, the rotating component (8) can push the connecting assembly (6) to move in the direction of insertion into the self-sealing valve (4).

6. The pressure regulating device according to claim 5, characterized in that, The first end of the positioning member (7) can be engaged with the pressure sensor, and the connecting component (6) can be movably inserted through the second end of the positioning member (7).

7. The pressure regulating device according to claim 5, characterized in that, The free end of the rotating component (8) has a groove (81), and the sides of the groove (81) are provided with inclined surfaces (82). During the rotation of the rotating component (8), the inclined surfaces (82) can push the connecting assembly (6) to move in the direction of inserting the self-sealing valve (4), so that the connector (5) is inserted into the detection port (42) and pushes the valve core (41) to the second position.

8. The pressure regulating device according to claim 1, characterized in that, The pressure sensor also includes an elastic element (43) which is sleeved on the valve core (41). The elastic element (43) can provide a restoring force for the valve core (41) to move to a first position.

9. The pressure regulating device according to claim 1, characterized in that, The connector (5) is fitted with a sealing ring (51).

10. The pressure regulating device according to any one of claims 1-9, characterized in that, The first pipe (1) has a first sub-pipe (11) and a second sub-pipe (12). The first sub-pipe (11) is connected to the second pipe (2). The second sub-pipe (12) is connected to the first sub-pipe (11) and the meter head (3) respectively. When the valve core (41) is in the first position, the first sub-pipe (11) is connected to the second sub-pipe (12). When the valve core (41) is in the second position, it can block the connection between the first sub-pipe (11) and the second sub-pipe (12). The second sub-pipe (12) can be connected to the connecting component inserted into the detection port (42).

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