Movable pressure monitoring device for closed space

Abstract

The invention relates to a movable pressure monitoring device for a closed space, which is characterized in that an air inlet chamber, a buffer chamber and a liquid level chamber are arranged in a protective shell, a first U-shaped pipe and a second U-shaped pipe are arranged at the top of the protective shell, the first U-shaped pipe is communicated with the air inlet chamber and the buffer chamber, and the second U-shaped pipe is communicated with the buffer chamber and the liquid level chamber; a floating ball type pressure sensor is arranged in the liquid level chamber, and an alarm device is arranged on the surface of the protective shell. An upper cover plate is arranged at the top of the protective shell, a J-shaped bent pipe is connected to the position, corresponding to the liquid level chamber, of the upper cover plate, and one end of the J-shaped bent pipe is communicated with the atmosphere; and a liquid level meter is arranged in the liquid level chamber. During use, the pressure in the primary and secondary shielding spaces is reflected as the liquid level of the liquid level chamber, and the change of the gas pressure in the shielding spaces can be intuitively and quickly known by observing the change of the liquid level meter, so that the effective pressure monitoring is realized. And the floating ball type liquid level sensor can transmit liquid level information in real time and give an alarm once the liquid level information exceeds the standard, so that the pressure information can be collected in time, and the on-site inspection pressure of the pressure monitoring device is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of confined space detection, in particular to a movable pressure monitoring device for confined spaces. Background Art

[0002] In the existing technology, during the air tightness test of the main and secondary spaces of a natural gas storage tank, internal pressure fluctuations may occur in the main and secondary shielded spaces due to the air tightness operation under positive pressure. However, in the existing technology, there is no device that can monitor pressure changes in real time, and it is impossible to effectively observe the pressure conditions in the main and secondary shielded spaces in real time, which brings certain safety hazards to the air tightness test.

[0003] Therefore, there is an urgent need in the market for a movable pressure monitoring device for confined spaces. Summary of the Invention

[0004] The purpose of the present invention is to provide an improved movable pressure monitoring device for confined spaces. Through structural improvements, the pressure changes in the primary and secondary shielded spaces can be observed in real time, and effective pressure monitoring and alarm prompts can be performed.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the present invention is: a movable pressure monitoring device for a confined space, comprising a protective shell, characterized in that: an air intake chamber 17, a buffer chamber 22 and a liquid level chamber 18 are arranged side by side in the protective shell, and a first U-shaped tube and a second U-shaped tube are provided on the top of the protective shell, the two ends of the first U-shaped tube are respectively connected to the air intake chamber and the buffer chamber, and the two ends of the second U-shaped tube are respectively connected to the buffer chamber and the liquid level chamber; a float-type pressure sensor is provided in the liquid level chamber, and an alarm device is provided on the surface of the protective shell, and the float-type pressure sensor and the alarm device are respectively connected to the system control platform through signal cables; an upper cover plate 13 is provided on the top of the protective shell, and a gas inlet pipe is connected to the upper cover plate corresponding to the air intake chamber, and a J-shaped bend 5 is connected to the upper cover plate corresponding to the liquid level chamber, and one end of the J-shaped bend is connected to the atmosphere; an observation window 3 is provided on the surface of the protective shell, and the position of the observation window corresponds to the liquid level chamber. A liquid level gauge is provided in the liquid level chamber, and the position of the liquid level gauge corresponds to the observation window.

[0006] Preferably, the protective shell is divided into an air inlet chamber, a buffer chamber and a liquid level chamber by a partition. The buffer chamber is provided with water occupying 1 / 5-1 / 3 of the volume of the buffer chamber to filter the ammonia in the pipeline. A drainage ball valve is provided on the lower side of the air inlet chamber and the liquid level chamber respectively, and a corresponding canopy is provided above the drainage ball valve.

[0007] Furthermore, the float type pressure sensor includes a reed switch and a movable float sleeved on the outside of the reed switch, the float is connected to the float rod, a magnet is provided on the float, and a liquid level sensor is provided in the reed switch.

[0008] Furthermore, one end of the second U-shaped tube extends into the liquid level chamber, and the depth of the extension accounts for 2 / 3-4 / 5 of the height of the liquid level chamber. A flange 9 and an inlet ball valve 10 are provided on the gas inlet pipeline to match it.

[0009] A method for using a movable pressure monitoring device for a confined space, characterized in that the method comprises the following steps: a. monitoring the pressure of the primary and secondary shielding spaces, connecting the primary and secondary shielding spaces to two movable pressure monitoring devices respectively, and connecting the primary and secondary shielding spaces to the air inlet chamber respectively through gas inlet pipes; b. providing a certain amount of water in the liquid level chamber, and providing water occupying 1 / 5-1 / 3 of the volume of the buffer chamber in the buffer chamber, at which time the pressure in the buffer chamber is consistent with the pressure in the primary and secondary shielding spaces; c. when the pressure in the primary and secondary shielding spaces changes, the reading of the liquid level gauge in the liquid level chamber connected thereto changes directly, and real-time pressure monitoring can be performed; d. a float-type pressure sensor transmits the liquid level signal in the liquid level chamber to the system control platform in real time. When the liquid level is too high, the system control platform activates the alarm device.

[0010] Preferably, in step c, in the initial state, the pressure in the shielding space is P1, and the liquid level in the liquid level chamber is d1, then

[0011]

[0012] At this time, the second U-shaped tube penetrates into the liquid level chamber and the liquid level in the tube is consistent with the liquid level in the liquid level chamber;

[0013] When the pressure in the shielded space changes, the real-time pressure P1' in the shielded space is:

[0014] P1'=AP+100*d1' (2)

[0015] Where AP is the atmospheric pressure, and d1' is the level gauge reading under pressure change conditions.

[0016] Furthermore, in step d, when the system control platform receives the electrical signal from the float pressure sensor, it starts the comparison control logic program to compare the input electrical signal value M1 with the preset liquid level equivalent current value M2.

[0017] Δ=M1-M2

[0018] When the transmitted electrical signal value is less than the preset current value, it returns "0" and returns the return value to the float pressure sensor; when the transmitted electrical signal value is greater than the preset current value, it returns "1" and returns it to the system platform and alarm device, and the alarm device sounds an alarm.

[0019] Compared with the prior art, the technical solution of the present invention not only improves the overall technical solution, but also includes many improvements in details. Specifically, it has the following beneficial effects:

[0020] 1. The improved solution of the present invention comprises an air inlet chamber 17, a buffer chamber 22 and a liquid level chamber 18 arranged in parallel in the protective shell, a first U-shaped tube and a second U-shaped tube provided on the top of the protective shell, the two ends of the first U-shaped tube being respectively connected to the air inlet chamber and the buffer chamber, and the two ends of the second U-shaped tube being respectively connected to the buffer chamber and the liquid level chamber; an upper cover plate 13 is provided on the top of the protective shell, a gas inlet pipe is connected to the upper cover plate corresponding to the air inlet chamber, and a J-shaped elbow 5 is connected to the upper cover plate corresponding to the liquid level chamber, one end of the J-shaped elbow is connected to the atmosphere; an observation window 3 is provided on the surface of the protective shell, and a liquid level gauge is provided in the liquid level chamber; the device is connected to the primary and secondary shielding spaces respectively, and the changes in the liquid level counter value can directly reflect the pressure changes in the shielding space, thereby performing real-time pressure monitoring;

[0021] 2. In the technical solution of the present invention, a float-type pressure sensor is provided in the liquid level chamber, and an alarm device is provided on the surface of the protective shell. The float-type pressure sensor and the alarm device are respectively connected to the system control platform via signal cables, which can monitor the pressure changes in the confined space in real time. The water protection pressure safety value can be preset according to on-site requirements, and the overpressure information in the cabin can be timely obtained and the alarm information can be issued at the monitoring end and the device. This greatly reduces the inspection pressure, improves the observation accuracy, and avoids the mistakes of night observation.

[0022] 3. In the structure of the present invention, water is placed in the buffer chamber, which occupies 1 / 5-1 / 3 of the volume of the buffer chamber. The air path connecting the enclosed space contains a certain concentration of ammonia. The water in the buffer chamber can effectively filter out a small amount of ammonia in the air path, preventing it from escaping into the air. At the same time, the buffer area formed can prevent the pressure of the enclosed environment to be tested from dropping suddenly, and the liquid in the device from being sucked back into the pipeline or even into the cabin, thus ensuring safety in use.

[0023] 4. In the technical solution of the present invention, one end of the U-shaped tube extends into the liquid level chamber, and the depth of the extension accounts for 2 / 3-4 / 5 of the height of the liquid level chamber. Since the U-shaped tube extends deep into the liquid level chamber, the liquid level in the tube is consistent with the liquid level in the liquid level chamber; when the pressure in the confined space changes, the display of the liquid level gauge will change, thereby monitoring the pressure in the confined space in real time, ensuring effective pressure monitoring and ensuring the safety and effectiveness of air tightness detection;

[0024] 5. The method of use of the present invention is convenient, reliable, and easy to operate. At the same time, the structure and layout are reasonable, the manufacturing cost is low, and it is easy to promote and utilize. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention.

[0026] Figure 2 It is a top schematic diagram of an embodiment of the present invention.

[0027] Figure 3 FIG. 1 is a structural diagram of an embodiment of the present invention.

[0028] Figure 4 It is a cross-sectional view of the present invention.

[0029] Figure 5 This is a flowchart of the alarm mechanism of the control system platform of the present invention.

[0030] Figure 6 This is a schematic diagram of the connection between the primary and secondary shielding spaces when the present invention is used.

[0031] Figure 7 It is the principle diagram of the liquid level meter of the present invention.

[0032] Reference numerals:

[0033] 1 bolt, 2 hexagonal nut, 3 observation window, 41 first U-shaped tube, 42 second U-shaped tube, 5 J-shaped elbow, 6 canopy, 7 drainage ball valve, 8 universal caster, 9 flange, 10 inlet ball valve, 11 liquid level gauge, 12 caster mounting plate, 13 upper cover, 14 partition, 15 faucet, 16 protective shell, 17 air intake chamber, 18 liquid level chamber, 19 alarm device, 20 magnet, 21 reed switch, 22 buffer chamber. DETAILED DESCRIPTION

[0034] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] The present invention provides a movable pressure monitoring device for a confined space, including a protective shell, see Figure 1The difference between the present invention and the prior art is that an independent air inlet chamber 17, a buffer chamber 22 and a liquid level chamber 18 are arranged in parallel in the protective shell. A first U-shaped tube 41 and a second U-shaped tube 42 are provided on the top of the protective shell. The two ends of the first U-shaped tube are connected to the air inlet chamber and the buffer chamber respectively, and the two ends of the second U-shaped tube are connected to the buffer chamber and the liquid level chamber respectively. The air inlet chamber, the buffer chamber and the liquid level chamber are interconnected through the first and second U-shaped tubes. A float pressure sensor is provided in the liquid level chamber, and an alarm device 19 is provided on the surface of the protective shell. The float pressure sensor and the alarm device are respectively connected to the system control platform through signal cables; an upper cover plate 13 is provided on the top of the protective shell, and a gas inlet pipe is connected to the upper cover plate corresponding to the air inlet chamber, and a J-shaped elbow 5 is connected to the upper cover plate corresponding to the liquid level chamber, and one end of the J-shaped elbow is connected to the atmosphere; an observation window 3 is provided on the surface of the protective shell, and the position of the observation window corresponds to the liquid level chamber. A liquid level gauge is provided in the liquid level chamber, and the position of the liquid level gauge 11 corresponds to the observation window, which is convenient for real-time observation, data reading, and effective monitoring.

[0036] During implementation, the protective shell is divided by partitions into an air intake chamber, a buffer chamber, and a liquid level chamber. A level gauge is installed in the liquid level chamber, and water at the same pressure as the enclosed space to be monitored is added to the chamber. Due to atmospheric pressure, when the pressure in the primary and secondary shielded spaces is stable, the water level in the level gauge remains unchanged. The pressure in the shielded spaces is reflected in the liquid level in the liquid level chamber of the device. By observing the changes in the level gauge reading, the pressure changes in the primary and secondary shielded spaces can be intuitively and quickly understood. This direct and clear information allows for real-time observation and effective pressure monitoring.

[0037] In addition, a float-type liquid level sensor is installed in the liquid level chamber, transmitting liquid level information in the form of an electrical signal in real time to the system control platform. The system uses comparative control logic to compare the input electrical signal value with the preset liquid level equivalent current value. When the transmitted electrical signal value is less than the preset current value, the return value is "0" and sent back to the sensor. When the transmitted electrical signal value is greater than the preset current value, the return value is "1" and sent back to the system platform and alarm device, which then sounds an alarm (buzzer). This enables remote pressure monitoring of the primary and secondary shielded spaces, reducing the pressure of on-site inspections and reducing errors in nighttime inspections.

[0038] Example 1

[0039] The movable pressure monitoring device for a confined space described in this embodiment includes a protective shell. Figure 1, an independent air inlet chamber 17, a buffer chamber 22 and a liquid level chamber 18 are arranged in parallel in the protective shell, a first U-shaped tube 41 and a second U-shaped tube 42 are provided on the top of the protective shell, the two ends of the first U-shaped tube are respectively connected to the air inlet chamber and the buffer chamber, the two ends of the second U-shaped tube are respectively connected to the buffer chamber and the liquid level chamber, and the air inlet chamber, the buffer chamber and the liquid level chamber are interconnected through the first and second U-shaped tubes; a float pressure sensor is provided in the liquid level chamber, an alarm device 19 is provided on the surface of the protective shell, and the float pressure sensor and the alarm device are respectively connected. It is connected to the system control platform through a signal cable; an upper cover 13 is provided on the top of the protective shell, and a gas inlet pipe is connected to the upper cover corresponding to the air inlet chamber, and a J-shaped elbow 5 is connected to the upper cover corresponding to the liquid level chamber, and one end of the J-shaped elbow is connected to the atmosphere; an observation window 3 is provided on the surface of the protective shell, and the position of the observation window corresponds to the liquid level chamber. A liquid level gauge is provided in the liquid level chamber, and the position of the liquid level gauge 11 corresponds to the observation window. The liquid level gauge is connected to the liquid level chamber through a hollow screw, which is convenient for real-time observation, data reading, and effective monitoring.

[0040] Specifically, the protective shell is divided into an air intake chamber, a buffer chamber and a liquid level chamber by a partition. The buffer chamber is filled with water that occupies 1 / 5-1 / 3 of the volume of the buffer chamber to filter the ammonia in the pipeline. A drainage ball valve 7 is provided on the lower side of the air intake chamber and the liquid level chamber respectively, and a corresponding canopy 6 is provided above the drainage ball valve.

[0041] Furthermore, the float-type pressure sensor includes a reed switch 21 and a movable float sleeved on the outside of the reed switch. The float is connected to the float rod and is in the shape of a ring. Annular magnets 20 are arranged on the top and bottom of the float, respectively. The magnets are close to the outer wall of the reed switch. A liquid level sensor is arranged along the reed switch inside the reed switch. The magnet here cooperates with the liquid level sensor. Through the movement of the magnet, the liquid level sensor can convert the liquid level information into resistance information proportional to the change in liquid level. The above liquid level information is then transmitted to the control system platform for real-time monitoring of the liquid level. Here, the ratio of the height of the annular magnet to the diameter of the reed switch is 1:1-0.8, and the distance between the liquid level sensor and the reed switch wall is 1-3mm.

[0042] Furthermore, one end of the second U-shaped tube extends into the liquid level chamber, and the depth of the extension accounts for 2 / 3-4 / 5 of the height of the liquid level chamber, with a preferred value of 3 / 4. The gas inlet pipe is provided with a flange 9 and an inlet ball valve 10 that cooperate therewith. Since the present invention is provided with an inlet chamber, a buffer chamber and a liquid level chamber, the pressure in the primary and secondary shielded spaces connected to the pressure monitoring device is reflected as the pressure of the device through the principle of atmospheric pressure, and the liquid level in the device can also be controlled. A fixed universal caster 8 is installed under the water protection device to facilitate the movement of the device. It has a simple structure, is easy to transport, and has good on-site use value.

[0043] Example 2

[0044] Described in this embodiment is a method for using a movable pressure monitoring device for a confined space, the method comprising the following steps: a. monitoring the pressure of the primary and secondary shielding spaces, connecting the primary and secondary shielding spaces to two movable pressure monitoring devices respectively, and connecting the primary and secondary shielding spaces to corresponding air inlet chambers through gas inlet pipes; b. adding 1 / 5-1 / 4 of the volume of water into the liquid level chamber to submerge one end of the U-shaped tube deep into the liquid level, and providing the buffer chamber with water occupying 1 / 5-1 / 3 of the volume of the buffer chamber. At this time, the pressure in the buffer chamber is consistent with the pressure in the primary and secondary shielding spaces; c. when the pressure in the primary and secondary shielding spaces changes, the reading of the liquid level gauge in the liquid level chamber connected thereto changes directly, and real-time pressure monitoring can be performed; d. the float pressure sensor transmits the liquid level signal in the liquid level chamber to the system control platform in real time. When the liquid level is too high, the system control platform activates the alarm device.

[0045] Specifically, in the device of the present invention, the first and second U-shaped tubes connect the air intake chamber and the buffer chamber, and the buffer chamber and the liquid level chamber, respectively. The protective shell has a strip-shaped opening, embedded with an acrylic plate observation window 3 for observing the internal water level. The observation window is secured with nuts and studs. The upper cover plate 13 is fixed to the upper surface of the protective shell by nuts 1 and studs 2 and is welded to the air intake pipe and U-shaped tubes.

[0046] A drainage ball valve 7 is installed below the air inlet chamber and the liquid level chamber on both sides for draining the water from the room. A canopy 6 is set on the ball valve to provide protection for the drainage ball valve. A fixed movable universal wheel 8 is set below the protective shell to support the movement of the equipment.

[0047] When the confined space is connected to the flange pipe on the upper cover of the air inlet chamber through a pipe, the gas in the confined space passes through the air inlet chamber and reaches the liquid level chamber. The liquid level gauge is connected to the liquid level chamber, and the liquid level on the gauge is the same as that in the liquid level chamber. The "J"-shaped pipe is connected to the atmosphere, and the bottom of the U-shaped pipe entering the liquid level chamber is kept level with the zero scale of the liquid level gauge.

[0048] The primary or secondary shielded space is connected to the air inlet chamber via an air inlet pipe and valve, and a certain amount of liquid is injected into the liquid level chamber. Because the water protection device is connected to the primary and secondary spaces, the pressure in the water protection device is consistent with the pressure in the primary and secondary spaces. When the gas pressure in the space changes, the liquid level reading on the liquid level gauge will also change.

[0049] When the primary and secondary spaces are under positive pressure higher than atmospheric pressure, the gas in the enclosed space enters the liquid level chamber through the air inlet chamber and pushes the water level in the U-shaped tube deep inside the liquid level chamber downward. When the pressure in the primary and secondary spaces increases, the level gauge reading increases.

[0050] In the initial state, the pressure in the shielding space is P1, and the liquid level in the liquid level chamber is d1, then

[0051]

[0052] At this time, the second U-shaped tube penetrates into the liquid level chamber and the liquid level in the tube is consistent with the liquid level in the liquid level chamber;

[0053] When the pressure in the shielded space changes, the real-time pressure P1' in the shielded space is:

[0054] P1'=AP+100*d1 ' (2)

[0055] Where AP is the atmospheric pressure, and d1' is the level gauge reading under pressure change conditions.

[0056] The atmospheric pressure principle is used to reflect the pressure in the primary and secondary shielded spaces connected to the device as the liquid level in the liquid level chamber. By observing the changes in the level gauge reading, the pressure changes in the primary and secondary spaces can be intuitively and quickly understood. This is straightforward and allows for real-time observation and effective pressure monitoring.

[0057] A float-type liquid level sensor is installed inside the liquid level chamber. The float floats on the liquid surface inside the device and moves up and down along the reed switch. A liquid level sensor is installed in the conduit. Under the influence of an external magnetic field, it converts the liquid level information in the liquid level chamber into a resistance signal proportional to the liquid level change. This information is then transmitted to the tightness detection control platform in the form of an electrical signal. The control platform is set with a safety value that limits the equivalent electrical signal of the liquid level signal. When the electrical signal transmitted by the liquid level exceeds the preset warning signal, the tightness detection control platform system issues an alarm signal, triggering water protection and the system buzzer to sound an alarm. This facilitates the timely collection of information on excessive pressure in the cabin and reduces the pressure on on-site inspections of the pressure monitoring device.

[0058] Example 3

[0059] In this embodiment, a portable pressure monitoring device for confined spaces includes a frame structure formed by a protective shell 16. Baffles define three independent compartments: an air intake chamber, a buffer chamber, and a liquid level chamber. This prevents sudden pressure drops in the primary and secondary compartments, which could cause liquid in the device to be sucked back into the primary and secondary compartments and into the gas pipelines. The volume ratio of the air intake chamber, buffer chamber, and liquid level chamber is 1:1 to 0.75:1. The buffer chamber in the device can filter out small amounts of ammonia in the pipelines, reducing the possibility of ammonia escaping into the atmosphere.

[0060] A float-type pressure sensor is installed in the liquid level chamber, and a buzzer alarm device is installed on the surface of the protective shell. Specifically, the float-type liquid level sensor consists of three parts: a float, a float rod, and a sensor. The float-type sensor is connected to the system control platform via a signal cable. During operation, it is based on the principle of buoyancy balance, and the water level is detected by the floating and sinking of the float. The float of the sensor is made of lightweight materials such as plastic and foam. When the liquid level rises, the float will rise with it, and vice versa. Under the action of an external magnet, the liquid level sensor converts the liquid level information in the liquid level chamber into resistance information proportional to the liquid level change, and transmits the liquid level information in the form of an electrical signal through the signal cable to the control end system platform.

[0061] Specifically, the float-type pressure sensor consists of a square reed switch 21 and a movable float mounted on the outside of the reed switch. The float is connected to a float rod and has a square ring structure. A similarly square ring magnet 20 is positioned in the center of the float, closely attached to the outer wall of the reed switch. The reed switch houses a liquid level sensor positioned along the reed switch, where the magnet mates with the liquid level sensor. The magnet used is a N50 neodymium iron boron magnet with a remanence of 1.40–1.45T, which improves sensitivity and detection accuracy. The square ring magnet has a higher effective magnetic moment, resulting in better performance.

[0062] Furthermore, a buzzer is connected to the system control platform's logic control circuit via a power cord, and sounds an alarm when it receives a logic signal from the system platform indicating excessive pressure. The buzzer alarm can be turned off manually or remotely by clicking the off button on the system.

[0063] When the system control platform receives the electrical signal from the float pressure sensor, it starts the comparison control logic program and compares the input electrical signal value M1 with the preset liquid level equivalent current value M2.

[0064] Δ=M1-M2

[0065] When the transmitted electrical signal value is less than the preset current value, the value returns "0" and is sent back to the float pressure sensor. When the transmitted electrical signal value is greater than the preset current value, the value returns "1" and is sent back to the system platform and alarm device, which then sounds an alarm. This system can monitor pressure changes within confined spaces in real time, preset water protection pressure safety values ​​based on site requirements, and promptly monitor overpressure within the cabin, generating alarms at the monitoring terminal and device. This significantly reduces inspection workload, improves observation accuracy, and avoids errors during nighttime observations.

[0066] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be considered that the specific implementation of the present invention is limited to the above description. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A movable pressure monitoring device for a confined space, comprising a protective housing, characterized in that: An air inlet chamber (17), a buffer chamber (22) and a liquid level chamber (18) are arranged in parallel in the protective shell. A first U-shaped tube and a second U-shaped tube are arranged on the top of the protective shell. The two ends of the first U-shaped tube are respectively connected to the air inlet chamber and the buffer chamber, and the two ends of the second U-shaped tube are respectively connected to the buffer chamber and the liquid level chamber. A float-type pressure sensor is installed in the liquid level chamber, and an alarm device is installed on the surface of the protective shell. The float-type pressure sensor and the alarm device are connected to the system control platform through signal cables respectively; An upper cover plate (13) is provided on the top of the protective shell, a gas inlet pipe is connected to the upper cover plate corresponding to the air inlet chamber, and a J-shaped elbow (5) is connected to the upper cover plate corresponding to the liquid level chamber, one end of the J-shaped elbow is connected to the atmosphere; an observation window (3) is provided on the surface of the protective shell, the position of the observation window corresponds to the liquid level chamber, and a liquid level gauge (11) is provided in the liquid level chamber, the position of the liquid level gauge corresponds to the observation window.

2. The device for use in a confined space according to claim 1, characterized in that: The protective shell is divided into an air intake chamber, a buffer chamber and a liquid level chamber by a partition. The buffer chamber is filled with water that accounts for 1 / 5-1 / 3 of the volume of the buffer chamber to filter the ammonia in the pipeline. A drainage ball valve is respectively provided on the lower side of the air intake chamber and the liquid level chamber, and a corresponding canopy is provided above the drainage ball valve.

3. The movable pressure monitoring device for a confined space according to claim 1, characterized in that: The float type pressure sensor includes a reed switch and a movable float sleeved on the outside of the reed switch. The float is connected to the float rod. A magnet is provided on the float. A liquid level sensor is provided in the reed switch.

4. The movable pressure monitoring device for a confined space according to claim 1, characterized in that: One end of the second U-shaped tube extends into the liquid level chamber, and the depth of the extension accounts for 2 / 3-4 / 5 of the height of the liquid level chamber.

5. The movable pressure monitoring device for a confined space according to claim 1, characterized in that: The gas inlet pipe is provided with a flange 9 and an inlet ball valve 10 that match it.

6. The method for using the movable pressure monitoring device for a confined space according to claim 1, characterized in that: The method of use includes the following steps: a. monitoring the pressure of the primary and secondary shielding spaces, connecting the primary and secondary shielding spaces to two movable pressure monitoring devices respectively, and connecting the primary and secondary shielding spaces to the air inlet chamber respectively through gas inlet pipes; b. adding 1 / 5-1 / 4 of the volume of water into the liquid level chamber to submerge one end of the U-shaped tube deep into the liquid level, and providing water in the buffer chamber that occupies 1 / 5-1 / 3 of the volume of the buffer chamber. At this time, the pressure in the buffer chamber is consistent with the pressure in the primary and secondary shielding spaces; c. when the pressure in the primary and secondary shielding spaces changes, the reading of the liquid level gauge in the liquid level chamber connected thereto changes directly, and real-time pressure monitoring can be performed; d. The float pressure sensor transmits the liquid level signal in the liquid level chamber to the system control platform in real time. When the liquid level is too high, the system control platform activates the alarm device.

7. The method for using the movable pressure monitoring device for a confined space according to claim 6, characterized in that: In step c, in the initial state, the pressure in the shielding space is P1, and the liquid level in the liquid level chamber is d1, then At this time, the second U-shaped tube goes deep into the liquid level chamber, and the liquid level in the tube is consistent with the liquid level in the liquid level chamber; when the pressure in the shielding space changes, the real-time pressure size P1 in the shielding space ' for: P1 ' =AP+100*d1 ' (2) Where AP is atmospheric pressure, d1 ' It is the reading of the liquid level gauge under the pressure change state.

8. The method for using the movable pressure monitoring device for a confined space according to claim 6, characterized in that: In step d, when the system control platform receives the electrical signal from the float pressure sensor, it starts the comparison control logic program to compare the input electrical signal value M1 with the preset liquid level equivalent current value M2. Δ=M1-M2 When the transmitted electrical signal value is less than the preset current value, it returns "0" and returns the return value to the float pressure sensor; when the transmitted electrical signal value is greater than the preset current value, it returns "1". The signal is returned to the system platform and the alarm device, which then sounds an alarm.

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