Positive pressure control system exhaust assembly, explosion-proof control box and explosion-proof positive pressure cabinet

Abstract

A positive pressure control system exhaust assembly, an explosion-proof control box and an explosion-proof positive pressure cabinet, the positive pressure control system exhaust assembly is used for exhausting the explosion-proof positive pressure cabinet, comprising a shell, a cabinet airflow inlet opened on the shell, a hinge flap capable of being opened when the air pressure in the positive pressure chamber is greater than a threshold value, the hinge flap is movably arranged on the shell, and a stabilizing device is arranged between the hinge flap and the shell to stabilize the hinge flap on the cabinet airflow inlet. The exhaust assembly is a mechanical exhaust assembly, which replaces the traditional electromagnetic valve. The mechanical type is more reliable than electronic products, has a longer service life and better explosion-proof performance.

Description

Technical Field

[0001] This invention relates to an exhaust assembly for a positive pressure control system, an explosion-proof control box, and an explosion-proof positive pressure cabinet. Background Technology

[0002] With the development of industries such as petrochemicals, metal smelting, and pharmaceuticals, positive pressure explosion-proof distribution cabinets are being used more and more widely in system control. Positive pressure explosion-proof is a special type of explosion-proof system, whose main guiding principle is to isolate flammable substances from ignition sources to achieve the purpose of explosion protection.

[0003] When a positive-pressure explosion-proof distribution cabinet operates in a flammable and explosive environment, it is typically equipped with an inlet solenoid valve, an exhaust solenoid valve, a controller, and a pressure sensor to detect the internal and external air pressure. By opening the inlet solenoid valve, inert gas is introduced into the cabinet, making the internal air pressure greater than the external air pressure. This prevents flammable and explosive mixtures from entering the cabinet and avoids contact with electrical sparks generated by the components inside the cabinet during operation, which could lead to an explosion. However, when the internal air pressure exceeds a certain threshold, the exhaust solenoid valve needs to be opened to release the gas, maintaining the internal air pressure within a stable range.

[0004] To prevent excessive internal pressure, existing explosion-proof positive pressure cabinets are equipped with exhaust solenoid valves. For example, a positive pressure explosion-proof electromagnetic / throttle valve disclosed in patent publication number CN212959936U includes a main valve body with an inlet flow channel and an exhaust flow channel, an electromagnetic valve seat, and an electromagnetic valve rod. The main valve body also has a valve-controlled flow channel and an adjustment flow channel. The valve-controlled flow channel is located between the electromagnetic valve seat and the main valve body. The electromagnetic valve rod has a closed state and an open state relative to the main valve body. A flow valve seat is also fixed on the main valve body, and a flow valve rod is inserted into the flow valve seat at any position along the center line of the flow valve seat. The adjustment flow channel is located between the flow valve seat and the main valve body. Controlling the flow valve rod causes the adjustment flow channel to gradually change to cut off or gradually change to open. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an exhaust assembly for a positive pressure control system.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a positive pressure control system exhaust assembly for exhausting explosion-proof positive pressure cabinet, including a housing, an airflow inlet for the cabinet opened on the housing, and an opening and closing spring plate that can be opened when the air pressure in the positive pressure chamber is greater than a threshold, the opening and closing spring plate being movably disposed on the housing, and a stabilizing device being provided between the opening and closing spring plate and the housing to ensure that the opening and closing spring plate is stably disposed on the airflow inlet for the cabinet. After the positive pressure control system exhaust assembly is installed, the opening and closing spring plate is controlled by the air pressure in the positive pressure cabinet cavity and has two working states. When the opening and closing spring plate is in the first working state, since the air pressure in the positive pressure cavity has not reached the threshold, the opening and closing spring plate is stably covered on the airflow inlet in the cabinet by the stabilizing device. At this time, the explosion-proof positive pressure cabinet does not need to exhaust pressure. When the opening and closing spring plate is in the second working state, since the air pressure in the positive pressure cavity is greater than the threshold, the air pressure acts on the opening and closing spring plate, causing the opening and closing spring plate to be at least partially opened by the air pressure. The greater the air pressure in the positive pressure cavity, the greater the opening range. The gas in the positive pressure cavity is exhausted and depressurized through the airflow inlet in the cabinet.

[0007] In some embodiments, the housing has a sealed cavity and an exhaust cavity for venting to the atmosphere, the airflow inlet inside the cabinet is connected to the exhaust cavity, a plurality of pressure sensors are installed in the sealed cavity, the housing wall has a plurality of pressure detection channels corresponding to the respective pressure sensors, and the housing has a circuit interface connected to the pins of the plurality of pressure sensors.

[0008] In some embodiments, the plurality of pressure sensors include an internal pressure sensor for detecting internal pressure, an external pressure sensor for detecting external pressure, and an inlet pressure sensor for detecting pressure at the airflow inlet inside the cabinet. The plurality of pressure detection channels include an internal detection channel communicating with the inside of the cabinet and facing the internal pressure sensor, an external detection channel communicating with the outside of the cabinet and facing the external pressure sensor, and an inlet detection channel communicating with the airflow inlet inside the cabinet and facing the inlet pressure sensor.

[0009] In some embodiments, the housing is further provided with an airflow outlet communicating with the exhaust chamber, and the opening / closing spring plate is located inside the exhaust chamber.

[0010] In some embodiments, the housing includes an exhaust housing, a sensing housing with a sealing cover on the exhaust housing, and a sensing housing cover with a sealing cover on the sensing housing, wherein the exhaust chamber is formed between the exhaust housing and the sensing housing, and the sealing chamber is formed between the sensing housing and the sensing housing cover.

[0011] In some embodiments, the stabilizing device includes a magnetically adsorbed metal layer disposed around the airflow inlet inside the cabinet and a magnetically adsorbed ring disposed on the opening and closing spring plate, the magnetically adsorbed ring being magnetically attached to the magnetically adsorbed metal layer.

[0012] In some embodiments, the magnetic adsorption ring is a magnetic rubber ring.

[0013] In some embodiments, the stabilizing device includes at least one spring-loaded foot extending outward from the opening / closing spring plate, the spring-loaded foot being fixed to the housing.

[0014] Another technical problem to be solved by the present invention is to provide an explosion-proof control box.

[0015] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an explosion-proof control box including the positive pressure control system exhaust assembly described in any of the above embodiments, including an explosion-proof box shell, the positive pressure control system exhaust assembly being disposed inside the explosion-proof box shell, and a controller capable of being connected to a pressure sensor being disposed inside the explosion-proof box shell, an internal air inlet corresponding to the internal airflow inlet being opened on one side wall of the explosion-proof box shell, an internal air outlet corresponding to the exhaust chamber being opened on the other side wall of the explosion-proof box shell, and the above-mentioned side walls of the explosion-proof box shell being sealed to the positive pressure control system exhaust assembly.

[0016] Another technical problem to be solved by the present invention is to provide an explosion-proof positive pressure cabinet.

[0017] To solve the aforementioned technical problems, the present invention adopts the following technical solution: an explosion-proof positive pressure cabinet, comprising an explosion-proof control box and a positive pressure cabinet body with a vent, wherein the explosion-proof control box is fixed to the positive pressure cabinet body, and the vent is connected to the air inlet of the cabinet. The scope of the present invention is not limited to technical solutions formed by specific combinations of the above-mentioned technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-mentioned technical features or their equivalents. For example, technical solutions formed by substituting the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

[0018] Due to the application of the above technical solutions, the present invention has the following advantages compared with the prior art: The present invention provides a positive pressure control system exhaust assembly, an explosion-proof control box and an explosion-proof positive pressure cabinet. The exhaust assembly is a mechanical exhaust assembly that replaces the traditional solenoid valve. Mechanical components are more reliable, have a longer lifespan and better explosion-proof performance than electronic products. Attached Figure Description

[0019] Figure 1 Front view of the exhaust assembly of the positive pressure control system;

[0020] Figure 2 for Figure 1 A schematic diagram of the AA cross-section;

[0021] Figure 3 for Figure 1 BB cross-sectional diagram;

[0022] Figure 4 This is a rear view of the exhaust assembly of the positive pressure control system.

[0023] Figure 5 This is a schematic diagram showing the application of the positive pressure control system exhaust assembly and explosion-proof control box on an explosion-proof positive pressure cabinet.

[0024] The components are as follows: 1. Housing; 11. Exhaust housing; 11a. Exhaust chamber; 11b. Airflow inlet inside the cabinet; 11c. Airflow outlet inside the cabinet; 11d. Detection channel inside the cabinet; 11e. Detection channel outside the cabinet; 11f. Flow inlet detection channel; 12. Sensor housing; 12b. Sealing cavity; 13. Sensor housing cover; 14. Magnetic adsorption metal layer; 2. Opening and closing spring plate; 21. Magnetic adsorption ring; 22. Spring foot; 3. Pressure sensor; 31. Signal transmission interface; 4. Explosion-proof enclosure housing; 5. Positive pressure cabinet. Detailed Implementation

[0025] As attached Figure 1-4 The illustrated positive pressure control system exhaust assembly organically combines an exhaust valve and a pressure sensor, which are required for use in explosion-proof positive pressure cabinets. As a single component, it provides both exhaust and pressure relief functions, and also detects the air pressure inside and outside the explosion-proof positive pressure cabinet. The detailed structure is as follows:

[0026] The exhaust assembly includes a housing 1, which comprises an exhaust housing 11, a sensing housing 12 with a sealing cover on the exhaust housing 11, and a sensing housing cover 13 with a sealing cover on the sensing housing 12. An exhaust cavity 11a is formed between the exhaust housing 11 and the sensing housing 12, and a sealing cavity 12b is formed between the sensing housing 12 and the sensing housing cover 13. The exhaust housing 11 has an internal airflow inlet 11b corresponding to the exhaust cavity 11a and an internal airflow outlet 11c communicating with the exhaust cavity 11a. The internal airflow inlet 11b is used to connect to the inner cavity of the explosion-proof positive pressure cabinet.

[0027] The exhaust assembly also includes an opening and closing spring plate 2 located inside the exhaust chamber 11a and covering the airflow inlet 11b inside the cabinet. When the air pressure in the positive pressure chamber is greater than the threshold, the opening and closing spring plate 2 will be opened.

[0028] In this embodiment, the opening and closing spring plate 2 is movably disposed on the housing 1, and a stabilizing device is provided between the opening and closing spring plate 2 and the housing 1 to stably cover the airflow inlet 11b inside the cabinet.

[0029] The stabilizing device includes two thinner spring feet 22 extending outward in the same direction from the opening and closing spring plate 2. The opening and closing spring plate 2 and the spring feet 22 are integrally formed. If stainless steel is used, the ends of the spring feet 22 are fixed to the housing 1 and located in the exhaust chamber 11a. The spring feet 22 have a supporting function for the opening and closing spring plate 2. When the air pressure in the positive pressure chamber is stable, the spring feet 22 have a certain reset function for the opening and closing spring plate 2.

[0030] The stabilizing device also includes a magnetically adsorbed metal layer 14 surrounding the airflow inlet 11b inside the cabinet and a magnetically adsorbed ring 21 on the opening / closing spring plate 2. The magnetically adsorbed ring 21 is magnetically attached to the magnetically adsorbed metal layer 14. The magnetically adsorbed ring 21 is a magnetic rubber ring. When the air pressure inside the positive pressure chamber stabilizes, the magnetic attraction between the magnetically adsorbed ring 21 and the magnetically adsorbed metal layer 14 allows the opening / closing spring plate 2 to quickly close and seal onto the airflow inlet 11b inside the cabinet, maintaining a stable state. When the air pressure inside the positive pressure chamber exceeds a threshold, the gas inside the positive pressure chamber overcomes the magnetic attraction and pushes the opening / closing spring plate 2 open. As the air pressure inside the positive pressure chamber increases, the inflow rate of the gas increases. At the same time, the air pressure inside the positive pressure chamber can automatically control the exhaust flow rate and velocity, ensuring that the positive pressure chamber always operates within a stable pressure range. It is convenient to use, operates stably, is simple to install, and has low cost.

[0031] In addition, the stabilizing device can also adopt other structures, without illustration, such as using multiple guide rods to make the opening and closing spring plate slide in the exhaust chamber, and a stabilizing elastic element can be set between the end of the guide rod and the opening and closing spring plate to stably block the airflow inlet in the cabinet.

[0032] As attached Figure 2 , 3 As shown, multiple pressure sensors 3 are installed inside the sealed cavity 12b, and the shell wall of the housing 1 has multiple pressure detection channels corresponding to the respective pressure sensors 3.

[0033] Based on the installation positions of each air pressure sensor 3, the air pressure detection channels are reasonably arranged in the exhaust housing 11 and the sensor housing 12, so there is no need to introduce additional air pipes connected to the corresponding air pressure sensor 3. The overall structure is simpler and the assembly is easier. After the exhaust housing 11, the sensor housing 12 and the sensor cover 13 are fixedly installed, each air pressure detection channel is naturally formed.

[0034] For example, the multiple pressure sensors 3 include an internal pressure sensor 3 for detecting the pressure inside the cabinet, an external pressure sensor 3 for detecting the pressure outside the cabinet, and an inlet pressure sensor 3 for detecting the pressure at the airflow inlet 11b inside the cabinet. Correspondingly, the multiple pressure detection channels include an internal detection channel 11d that communicates with the inside of the cabinet and faces the internal pressure sensor 3, an external detection channel 11e that communicates with the outside of the cabinet and faces the external pressure sensor 3, and an inlet detection channel 11f that communicates with the airflow inlet 11b inside the cabinet and faces the inlet pressure sensor 3.

[0035] The housing 1 has a signal transmission interface 31 that connects to the pins of multiple pressure sensors 3. The signal transmission interface 31 and the multiple pressure sensors 3 are encapsulated on the housing 1.

[0036] As attached Figure 5 As shown, in this embodiment, the positive pressure control system exhaust assembly is organically combined with the explosion-proof control box. That is, the explosion-proof control box has the functions of air intake, exhaust pressure relief and control. The explosion-proof control box includes an explosion-proof box housing 4 and a controller that is explosion-proof and installed inside the explosion-proof box housing 4.

[0037] The positive pressure control system exhaust assembly is fixed inside the explosion-proof enclosure 4. One side wall of the explosion-proof enclosure 4 has an internal air inlet corresponding to the internal airflow inlet 11b and an internal air perforation corresponding to the internal detection channel 11d. The other side wall of the explosion-proof enclosure 4 has an internal air outlet corresponding to the exhaust chamber 11a. The upper side wall of the explosion-proof enclosure 4 is sealed to the positive pressure control system exhaust assembly, meaning the inner cavity of the explosion-proof enclosure 4 forms a sealed cavity, which is separate from the exhaust cavity. The exhaust assembly, including the housing 1, is located inside the explosion-proof enclosure 4, and an explosion-proof cavity is formed between them. The controller inside the explosion-proof enclosure 4 is connected to the pressure sensor via a signal transmission interface 31.

[0038] When installing the explosion-proof control box within an explosion-proof positive pressure cabinet, only a vent and an internal pressure detection port need to be provided on the positive pressure cabinet body 5. During installation, the vent is connected to the internal air inlet, and the internal pressure detection port is connected to the internal detection channel 11d via an internal air perforation on the explosion-proof box shell. This solution integrates the traditionally separate exhaust valve, controller, and pressure sensor located on the explosion-proof positive pressure cabinet into a single explosion-proof control box.

[0039] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An exhaust assembly for a positive pressure control system, characterized in that: The cabinet includes a shell (1), a cabinet airflow inlet (11b) opened on the shell (1), a opening and closing elastic plate (2) opened when the air pressure in the positive pressure chamber is greater than the threshold value, the opening and closing elastic plate (2) is movably arranged on the shell (1), and a stabilizing device is arranged between the opening and closing elastic plate (2) and the shell (1) to stably arrange the opening and closing elastic plate (2) on the cabinet airflow inlet (11b), The shell (1) has a sealed cavity (12b) and an exhaust cavity (11a) for exhausting air to the atmosphere, the cabinet airflow inlet (11b) is in communication with the exhaust cavity (11a), a plurality of air pressure sensors (3) are installed in the sealed cavity (12b), and the shell wall of the shell (1) has a plurality of air pressure detection channels corresponding to the corresponding air pressure sensors (3), and the shell (1) has a signal transmission interface (31) connected with the pins of the plurality of air pressure sensors (3).

2. The positive pressure control system vent assembly of claim 1, wherein: The plurality of air pressure sensors (3) include a cabinet air pressure sensor (3) for detecting the air pressure in the cabinet, a cabinet air pressure sensor (3) for detecting the air pressure outside the cabinet, and a flow inlet air pressure sensor (3) for detecting the air pressure at the cabinet airflow inlet (11b), and the plurality of air pressure detection channels include a cabinet detection channel (11d) in communication with the cabinet and facing the cabinet air pressure sensor (3), a cabinet detection channel (11e) in communication with the cabinet and facing the cabinet air pressure sensor (3), and a flow inlet detection channel (11f) in communication with the cabinet airflow inlet (11b) and facing the flow inlet air pressure sensor (3).

3. The positive pressure control system vent assembly of claim 1, wherein: The shell (1) further has a cabinet airflow outlet (11c) in communication with the exhaust cavity (11a), and the opening and closing elastic plate (2) is located in the exhaust cavity (11a).

4. The positive pressure control system vent assembly of claim 1, wherein: The shell (1) includes an exhaust shell (11), a sensing shell (12) sealed and arranged on the exhaust shell (11), and a sensing shell cover (13) sealed and arranged on the sensing shell (12), the exhaust shell (11) and the sensing shell (12) form the exhaust cavity (11a), and the sensing shell (12) and the sensing shell cover (13) form the sealed cavity (12b).

5. The positive pressure control system vent assembly of claim 1, wherein: The stabilizing device includes a magnetic adsorption metal layer (14) arranged around the cabinet airflow inlet (11b) and a magnetic adsorption ring (21) arranged on the opening and closing elastic plate (2), and the magnetic adsorption ring (21) can be magnetically adsorbed and arranged on the magnetic adsorption metal layer (14).

6. The positive pressure control system vent assembly of claim 5, wherein: The magnetic adsorption ring (21) is a magnetic rubber ring.

7. The positive pressure control system vent assembly of claim 1, wherein: The stabilizing device includes at least one elastic sheet foot (22) extending outward from the opening and closing elastic plate (2), and the elastic sheet foot (22) is fixed on the shell (1).

8. An explosion-proof control box comprising the positive pressure control system exhaust assembly of any one of claims 1-7. The positive pressure control system exhaust assembly is arranged in the explosion-proof box shell (4), a controller capable of being connected with the air pressure sensor (3) is further arranged in the explosion-proof box shell (4), a cabinet internal air inlet port corresponding to the cabinet internal air inlet (11b) is formed in one side wall of the explosion-proof box shell (4), a cabinet internal air outlet port corresponding to the exhaust cavity (11a) is formed in the other side wall of the explosion-proof box shell (4), and the side walls of the explosion-proof box shell (4) are sealed between the positive pressure control system exhaust assembly.

9. An explosion-proof pressurized cabinet, characterized by: The explosion-proof control box of claim 8 further comprises a positive pressure cabinet (5) provided with a gas leakage port, and the explosion-proof control box is fixed on the positive pressure cabinet (5), and the gas leakage port is connected in communication with the cabinet internal air inlet port.

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