Differential pressure monitoring mechanism and differential pressure detection device using the same

Abstract

The present invention discloses a differential pressure monitoring mechanism, which includes a mounting plate, a sensor and a pneumatic switching component mounted on the mounting plate. The pneumatic switching component includes a first housing, a second housing, a driving part and a movable part. The first housing is provided with a first cavity, and the second housing is provided with a second cavity. The movable part is closely attached to the second housing. The sensor is located in the space formed by the movable part and the second housing. A first opening communicating with the first cavity is provided on the outer wall of the first housing. A second opening and a third opening communicating with the second cavity are provided on the outer wall of the second housing. The second opening and the first opening are on the same side. The driving part is matched with the movable part. Under the drive of the driving part, the movable part can block the second opening or block the third opening. A differential pressure detection device is also provided, which includes the above differential pressure monitoring mechanism, and also includes a housing, a controller and a connecting hose.

Description

Technical Field

[0001] The present invention relates to the field of pressure detection devices, and particularly to a differential pressure monitoring mechanism and a differential pressure detection device using the same. Background Art

[0002] When a building catches fire, it is necessary to ensure the smoke prevention performance requirements of the smoke-proof stairwell, evacuation walkway and their front rooms. From the perspective of smoke prevention, too low a static pressure in the mechanical pressurized air supply system is not conducive to smoke prevention, so the higher the static pressure, the better. Since the evacuation door opens in the evacuation direction, and the direction of the pressurized air supply is exactly opposite to the evacuation direction, if the static pressure is too high, it will cause too large a pressure difference on both sides of the evacuation door, resulting in the door being unable to open normally, affecting the evacuation of personnel and the rescue of firefighters.

[0003] The design of the pressurized air supply system should first be based on safe evacuation. At present, the pressurized air supply system itself has no ability to judge whether the pressurized area maintains a certain pressure, or whether the leakage in the pressurized area is too large, the pressure fails to reach the standard, and the smoke prevention function cannot be achieved, or the evacuation door is blocked due to excessive pressure.

[0004] Therefore, it is very necessary to design a static pressure monitoring system to effectively monitor the pressure and differential pressure, etc. Summary of the Invention

[0005] The purpose of the present invention is to provide a differential pressure monitoring mechanism and a differential pressure detection device, which can at least solve one of the above problems.

[0006] According to one aspect of the present invention, a differential pressure monitoring mechanism is provided, including a mounting plate, a sensor and a pneumatic switching component mounted on the mounting plate. The pneumatic switching component includes a first housing, a second housing, a driving part and a movable part. The first housing is provided with a first cavity, the second housing is provided with a second cavity, the second housing is installed in the first cavity, the driving part and the movable part are installed in the second cavity, the movable part is in close contact with the second housing, the sensor is located in the space formed by the movable part and the second housing, a first opening communicating with the first cavity is provided on the outer wall of the first housing, a second opening and a third opening communicating with the second cavity are provided on the outer wall of the second housing, the second opening and the third opening are at different heights and are respectively located on both sides of the second housing, the second opening and the first opening are on the same side, the driving part cooperates with the movable part, and under the drive of the driving part, the movable part can block the second opening or block the third opening.

[0007] The present invention provides a differential pressure monitoring mechanism with a brand-new structure. The working principle of this mechanism is as follows: The air pressure switching component is used to switch the gas flowing into the space formed by the piston block and the second housing. The sensor is used to collect the change of gas pressure, thereby realizing the real-time monitoring of differential pressure, etc., providing accurate data support for subsequent control. More importantly, the air pressure switching process of the present invention is automatically carried out, with a simple and compact structure and high working efficiency.

[0008] In some embodiments, the driving part includes a coil and a permanent magnet. The coil is installed in the second housing, and the permanent magnet is sleeved inside the coil and cooperates with the movable part. Thus, the structure of the driving part is similar to that of a voice coil motor, and its working principle is similar to that of a voice coil motor. By forming a magnetic force through the energized coil and the permanent magnet, the movable part is pushed to move to complete the driving. A voice coil motor is a special form of direct drive motor, which has the characteristics of simple structure, small volume, high speed, high acceleration and fast response.

[0009] In some embodiments, the movable part includes a fixed column and a piston block. The piston block is sleeved on the outer periphery of the fixed column, and its outer edge is in close fit with the second housing. The sensor is located in the space formed by the piston block and the second housing. Under the action of the permanent magnet, the piston block can block the second opening or the third opening.

[0010] In some embodiments, the air pressure switching component further includes an isolation buffer. The isolation buffer is arranged at one end of the fixed column away from the piston block. Thus, the isolation buffer can prevent the fixed column from directly contacting other objects during installation, playing a buffering and isolating role and prolonging the service life.

[0011] In some embodiments, the isolation buffer is a spring. The isolation buffer is sleeved on the outer periphery of the fixed column, and the upper end of the isolation buffer abuts against the piston block. Thus, the spring has a low cost and can achieve the effects of isolation, buffering and reset.

[0012] In some embodiments, the piston block is provided with a plurality of ventilation holes for gas to pass through. Thus, the gas flowing into the first cavity can flow into the space formed by the piston block and the second housing through the ventilation holes, facilitating the detection by the sensor.

[0013] In some embodiments, the mounting plate is a circuit board. Thus, it is convenient to integrate other electronic components on the mounting plate to form a complete residual pressure detector.

[0014] In some embodiments, the thickness of the piston block is greater than the widths of the second opening and the third opening. Thus, it can ensure that the second opening or the third opening is sealed, and only the gas on one side can enter.

[0015] In some embodiments, a partition is provided inside the first housing. The partition is in limiting cooperation with the second housing and can divide the first cavity into two parts, forming a left cavity communicating with the second opening and a right cavity communicating with the third opening. An air inlet nozzle communicating with the right cavity is provided at the upper end of the first housing. Thus, it is convenient to realize the switching and detection of different pressures inside and outside the first cavity, and obtain accurate data such as differential pressure.

[0016] In some embodiments, the outer edge of the second housing is closely attached to the partition. Thus, air leakage can be avoided.

[0017] In some embodiments, a limiting block is provided inside the first housing. The limiting block is located at the top of the first cavity and is in limiting cooperation with the second housing. The outer edge of the second housing is closely attached to the limiting block. Thus, the limiting and fixing of the second housing can be realized.

[0018] According to another aspect of the present invention, a differential pressure detection device is further provided, which includes the above differential pressure monitoring mechanism, and further includes a housing, a controller and a connecting hose. The differential pressure monitoring mechanism is installed inside the housing. The controller is arranged on the mounting plate and is electrically connected to the sensor. One end of the air inlet nozzle extends outside the housing, and the other end communicates with the first cavity. The connecting hose is detachably sleeved on the outer periphery of the air inlet nozzle extending outside the housing.

[0019] Thus, the differential pressure detection device of the present invention applies the above differential pressure monitoring mechanism. The sensor can detect positive pressure, negative pressure or differential pressure. The connecting hose and the like are accessories and can be used in combination with the differential pressure monitoring mechanism; by connecting with the differential pressure monitoring mechanism through the connecting hose, the air pressures on both sides of the wall are collected respectively, and then the pressure difference value, pressure state and fault information of the evacuation passage residual pressure are fed back to the controller. The controller issues an alarm signal and records the overpressure fault according to the set parameters, which is convenient for subsequent corresponding processing. For example, when the residual pressure value in the smoke-proof stairwell or the anteroom reaches the overpressure monitoring value, the differential pressure monitoring mechanism issues an alarm signal, and the controller opens the bypass valve on the air duct of the pressurization fan to relieve pressure; after the residual pressure drops back to the normal range value, the differential pressure monitoring mechanism issues a signal, and the controller closes the bypass valve. The differential pressure detection device of the present invention can be combined with an alarm, a pressure relief valve, etc. to form a residual pressure monitoring system, and then control the opening of the bypass pressure relief valve to keep the residual pressure value stable within the range required by the specification, and has the characteristics of real-time, digital, intelligent and automatic continuous monitoring.

[0020] The beneficial effects of the present invention:

[0021] The present invention provides a differential pressure monitoring mechanism with a brand-new structure. The working principle of this mechanism is as follows: The air pressure switching component is used to switch the gas flowing into the space formed by the piston block and the second housing. The sensor is used to collect the change in gas pressure, thereby realizing real-time monitoring of differential pressure, etc., providing accurate data support for subsequent control. More importantly, the air pressure switching process of the present invention is automatically carried out, with a simple and compact structure and high working efficiency.

[0022] The differential pressure detection device of the present invention applies the above-mentioned differential pressure monitoring mechanism. The sensor can detect positive pressure, negative pressure or differential pressure, and connecting hoses, etc. are accessories that can be used in combination with the differential pressure monitoring mechanism; it is connected to the differential pressure monitoring mechanism through a connecting hose, respectively collects the air pressures on both sides of the wall, and then feeds back the pressure difference, pressure state and fault information of the evacuation passage residual pressure, etc. to the controller. The controller issues an alarm signal and records the overpressure fault according to the set parameters, which is convenient for subsequent corresponding processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional structural schematic diagram of the differential pressure monitoring mechanism of an embodiment of the present invention;

[0024] Figure 2 is Figure 1 the exploded structural schematic diagram of the differential pressure monitoring mechanism shown;

[0025] Figure 3 is Figure 1 the top view structural schematic diagram of the differential pressure monitoring mechanism shown;

[0026] Figure 4 is Figure 3 the sectional structural schematic diagram of the differential pressure monitoring mechanism shown in the A-A direction;

[0027] Figure 5 is Figure 1 the three-dimensional structural schematic diagram of the first housing of the differential pressure monitoring mechanism shown;

[0028] Figure 6 is Figure 1 the three-dimensional structural schematic diagram of the second housing of the differential pressure monitoring mechanism shown;

[0029] Figure 7 is Figure 1 the partial perspective structural schematic diagram of the differential pressure monitoring mechanism shown;

[0030] Figure 8 It is the installation schematic diagram of the differential pressure detection device of an embodiment of the present invention.

[0031] Figures 1 to 8Reference numerals in the drawings: 1 - outer shell; 2 - differential pressure monitoring mechanism; 3 - connecting hose; 21 - mounting plate; 22 - sensor; 23 - air pressure switching component; 231 - first housing; 232 - second housing; 233 - driving part; 234 - moving part; 235 - isolation buffer; 236 - partition; 237 - limit block; 2311 - first cavity; 2312 - first opening; 2313 - air inlet nozzle; 2321 - second cavity; 2322 - second opening; 2323 - third opening; 2331 - coil; 2332 - permanent magnet; 2341 - fixing column; 2342 - piston block; 2311a - left cavity; 2311b - right cavity; 2342a - vent hole. Detailed implementation mode

[0032] The present invention will be further described in detail below with reference to the drawings.

[0033] Figures 1 to 7 Schematically shows a differential pressure monitoring mechanism according to an embodiment of the present invention.

[0034] As Figures 1 to 7 As shown, the differential pressure monitoring mechanism 2 of this embodiment includes a mounting plate 21 and a sensor 22 and an air pressure switching component 23 mounted on the mounting plate 21. The air pressure switching component 23 is used to switch the gas flowing into the space formed by the piston block 2342 and the second housing 232, and the sensor 22 is used to collect the gas pressure change. The sensor 22 of this embodiment can be a commonly used air pressure sensor 22 on the market.

[0035] The air pressure switching component 23 of this embodiment includes a first housing 231, a second housing 232, a driving part 233 and a moving part 234. The first housing 231 is provided with a first cavity 2311, and the second housing 232 is provided with a second cavity 2321. The second housing 232 is installed in the first cavity 2311, and the driving part 233 and the moving part 234 are installed in the second cavity 2321. The outer edge of the moving part 234 is in close fit with the second housing 232. The sensor 22 is located in the space formed by the moving part 234 and the second housing 232. A first opening 2312 communicating with the first cavity 2311 is provided on the outer wall of the first housing 231. Second openings 2322 and third openings 2323 communicating with the second cavity 2321 are provided on the outer wall of the second housing 232. The second openings 2322 and the third openings 2323 are different in height and are respectively located on both sides of the second housing 232. The second opening 2322 and the first opening 2312 are on the same side. The driving part 233 cooperates with the moving part 234 to drive the moving part 234 to move along the inner wall of the second housing 232. Under the drive of the driving part 233, the moving part 234 can block the second opening 2322 or block the third opening 2323.

[0036] The driving part 233 of this embodiment includes a coil 2331 and a permanent magnet 2332. The coil 2331 is installed on the second housing 232, and the permanent magnet 2332 is sleeved inside the coil 2331 and cooperates with the movable part 234. Thus, the structure of the driving part 233 is similar to that of a voice coil motor, and its working principle is similar to that of a voice coil motor. By forming a magnetic force through the energized coil 2331 and the permanent magnet 2332, the movable part 234 is pushed to move to complete the driving. A voice coil motor is a special form of direct drive motor, which has the characteristics of simple structure, small volume, high speed, high acceleration and fast response.

[0037] The movable part 234 of this embodiment includes a fixed column 2341 and a piston block 2342. The permanent magnet 2332 of the driving part 233 cooperates with the fixed column 2341, and the piston block 2342 is sleeved on the outer periphery of the fixed column 2341 and its outer edge is in close fit with the second housing 232. The sensor 22 is located in the space formed by the piston block 2342 and the second housing 232. Under the drive of the driving part 233, the piston block 2342 can move up and down to block the second opening 2322 or block the third opening 2323.

[0038] The main shapes of the first housing 231 and the second housing 232 of this embodiment are cylindrical, and the piston block 2342 is disc-shaped.

[0039] A plurality of ventilation holes 2342a for gas to pass through are formed in the piston block 2342. The plurality of ventilation holes 2342a are circumferentially arranged in an array around the center of the piston block 2342. Thus, the gas flowing into the first cavity 2311 can flow into the space formed by the piston block 2342 and the second housing 232 through the ventilation holes 2342a, which is convenient for the detection of the sensor 22.

[0040] The air pressure switching component 23 of this embodiment further includes an isolation and buffer member 235, and the isolation and buffer member 235 is arranged at one end of the fixed column 2341 away from the piston block 2342. Thus, the isolation and buffer member 235 can prevent the fixed column 2341 from directly contacting other objects during installation, playing a role of buffering and isolation and prolonging the service life.

[0041] The isolation and buffer member 235 of this embodiment is a spring. The isolation and buffer member 235 is sleeved on the outer periphery of the fixed column 2341. The upper end of the isolation and buffer member 235 abuts against the piston block 2342, and the lower end abuts against the mounting plate 21. Thus, the spring has a low cost and can achieve the effects of isolation, buffering and reset.

[0042] The mounting plate 21 of this embodiment is a PCB circuit board. Thus, it is convenient to integrate other electronic components such as a control chip on the mounting plate 21 to form a complete differential pressure detector.

[0043] The thickness of the piston block 2342 is greater than the widths of the second opening 2322 and the third opening 2323. Thus, it can be ensured that the second opening 2322 or the third opening 2323 is sealed, and only the gas on one side can enter.

[0044] A partition 236 is provided in the first housing 231. The partition 236 is in limit fit with the second housing 232 and can divide the first cavity 2311 into two parts, forming a left cavity 2311a communicating with the second opening 2322 and a right cavity 2311b communicating with the third opening 2323. An air inlet nozzle 2313 communicating with the right cavity 2311b is provided at the upper end of the first housing 231. Thus, it is convenient to realize the switching and detection of different pressures inside and outside the first cavity 2311, and obtain accurate differential pressure and other data.

[0045] The outer edge of the second housing 232 is in close fit with the partition 236. Thus, air leakage can be avoided.

[0046] A limit block 237 is provided in the first housing 231. The limit block 237 is located at the top of the first cavity 2311 and is in limit fit with the second housing 232. The outer edge of the second housing 232 is in close fit with the limit block 237. Thus, the limit block 237 can realize the limitation and fixation of the second housing 232.

[0047] The present invention provides a differential pressure monitoring mechanism 2 with a brand-new structure. The working principle of this mechanism is as follows: The air pressure switching component 23 is used to switch the gas flowing into the space formed by the piston block 2342 and the second housing 232. The sensor 22 is used to collect the gas pressure change, so as to realize the real-time monitoring of the differential pressure and the like, and provide accurate data support for the subsequent control. More importantly, the air pressure switching process of the present invention is automatically carried out, with a simple and compact structure and high working efficiency.

[0048] Figure 8 Schematically shows a differential pressure detection device according to an embodiment of the present invention.

[0049] As Figure 8 shown, the differential pressure detection device includes the above-mentioned differential pressure monitoring mechanism 2. It also includes a housing 1, a controller, and a connecting hose 3. The differential pressure monitoring mechanism 2 is installed in the housing 1. The controller is arranged on the mounting plate 21 and is electrically connected to the sensor 22. One end of the air inlet nozzle 2313 extends out of the housing, and the other end is communicated with the first cavity 2311. The connecting hose 3 is detachably sleeved on the outer periphery of the air inlet nozzle 2313 extending out of the housing.

[0050] During actual use, the differential pressure detection device of this embodiment is installed on the outer wall of the anteroom or corridor in a wall-mounted manner. At the same time, galvanized steel pipes are used to pass through the wall and communicate with the corridor or staircase. One end of the connecting hose 3 is connected to the galvanized steel pipe, and the other end is sleeved on the air inlet nozzle 2313. Under normal conditions, the pressure range in the corridor or staircase is 40 - 50 Pa, and the pressure range in the anteroom or corridor is 25 - 30 Pa. The air pressure switching component 23 of this embodiment is used to switch the gas flowing into the space formed by the piston block 2342 and the second housing 232. For example, when the piston block 2342 blocks the second opening 2322, the sensor 22 detects the pressure of the gas input from the connecting hose 3, that is, the pressure value in the corridor or staircase is detected; when the piston block 2342 blocks the third opening 2323, the second opening 2322 communicates with the first opening 2312, and the sensor 22 detects the local gas pressure at the installation location of the differential pressure detection device, that is, the pressure value in the anteroom or corridor.

[0051] The differential pressure detection device of the present invention applies the above-mentioned differential pressure monitoring mechanism 2. The sensor 22 can detect positive pressure, negative pressure or differential pressure. Accessories such as the connecting hose 3 can be used in combination with the differential pressure monitoring mechanism 2; it is connected to the differential pressure monitoring mechanism 2 through the connecting hose 3 to collect the air pressures on both sides of the wall respectively, and then feeds back the pressure difference, pressure state and fault information of the evacuation passage residual pressure, etc. to the controller. The controller issues an alarm signal and records the overpressure fault according to the set parameters for subsequent corresponding processing. For example, when the residual pressure value in the smoke-proof staircase or anteroom reaches the overpressure monitoring value, the differential pressure monitoring mechanism 2 issues an alarm signal, and the controller opens the bypass valve on the air duct of the pressurization fan to relieve pressure; after the residual pressure drops back to the normal range value, the differential pressure monitoring mechanism 2 issues a signal, and the controller closes the bypass valve. The differential pressure detection device of the present invention can be combined with an alarm, a pressure relief valve, etc. to form a residual pressure monitoring system, and then control the opening of the bypass pressure relief valve to keep the residual pressure value stable within the range required by the specification, with characteristics such as real-time, digital, intelligent, and automated continuous monitoring.

[0052] The above are only some embodiments of the present invention. For those of ordinary skill in the art, without departing from the inventive concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. Differential pressure monitoring mechanism, Characterized in that, It includes a mounting plate (21), a sensor (22) and a pneumatic switching component (23) mounted on the mounting plate (21). The pneumatic switching component (23) includes a first housing (231), a second housing (232), a driving part (233) and a movable part (234). The first housing (231) is provided with a first cavity (2311), the second housing (232) is provided with a second cavity (2321), the second housing (232) is installed in the first cavity (2311), the driving part (233) and the movable part (234) are installed in the second cavity (2321), the movable part (234) is in close contact with the second housing (232), the sensor (22) is located in the space formed by the movable part (234) and the second housing (232). A first opening (2312) communicating with the first cavity (2311) is provided on the outer wall of the first housing (231), and a second opening (2322) and a third opening (2323) communicating with the second cavity (2321) are provided on the outer wall of the second housing (232). The second opening (2322) and the third opening (2323) are at different heights and are respectively located on both sides of the second housing (232). The second opening (2322) and the first opening (2312) are on the same side. The driving part (233) cooperates with the movable part (234). Under the drive of the driving part (233), the movable part (234) can block the second opening (2322) or block the third opening (2323); The driving part (233) includes a coil (2331) and a permanent magnet (2332). The coil (2331) is installed on the second housing (232), and the permanent magnet (2332) is sleeved in the coil (2331) and cooperates with the movable part (234); The movable part (234) includes a fixed column (2341) and a piston block (2342). The piston block (2342) is sleeved on the outer periphery of the fixed column (2341) and the outer edge is in close contact with the second housing (232). The sensor (22) is located in the space formed by the piston block (2342) and the second housing (232). Under the action of the permanent magnet (2332), the piston block (2342) can block the second opening (2322) or block the third opening (2323); The pneumatic switching component (23) further includes an isolation buffer (235). The isolation buffer (235) is arranged at one end of the fixed column (2341) away from the piston block (2342); A plurality of ventilation holes (2342a) are provided on the piston block (2342).

2. The differential pressure monitoring mechanism according to claim 1, Characterized in that, The isolation buffer (235) is a spring. The isolation buffer (235) is sleeved on the outer periphery of the fixed column (2341). One end of the isolation buffer (235) abuts against the piston block (2342), and the other end abuts against the mounting plate (21).

3. The differential pressure monitoring mechanism according to claim 1, characterized in that, the thickness of the piston block (2342) is greater than the widths of the second opening (2322) and the third opening (2323).

4. The differential pressure monitoring mechanism according to any one of claims 1 to 3, characterized in that, a partition plate (236) is provided in the first housing (231), the partition plate (236) is in limit fit with the second housing (232) and can divide the first cavity (2311) into two parts, forming a left cavity (2311a) communicating with the second opening (2322) and a right cavity (2311b) communicating with the third opening (2323), and an air inlet nozzle (2313) communicating with the right cavity (2311b) is provided at the upper end of the first housing (231).

5. The differential pressure monitoring mechanism according to claim 4, characterized in that, a limit block (237) is provided in the first housing (231), the limit block (237) is located at the top of the first cavity (2311) and is in limit fit with the second housing (232), and the outer edge of the second housing (232) is in close fit with the limit block (237).

6. A differential pressure detection device, characterized in that, it includes the differential pressure monitoring mechanism (2) according to claim 4 or 5, and further includes a housing (1), a controller and a connecting hose (3). The differential pressure monitoring mechanism (2) is installed in the housing (1), the controller is arranged on the mounting plate (21) and is electrically connected to the sensor (22), one end of the air inlet nozzle (2313) extends out of the housing, and the other end communicates with the first cavity (2311), and the connecting hose (3) is detachably sleeved on the outer periphery of the air inlet nozzle (2313) extending out of the housing.

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