Safety type electrical switch cabinet capable of automatically extinguishing fire

Abstract

The invention relates to the technical field of electrical equipment, in particular to a safety electrical switch cabinet capable of automatically extinguishing fire, which comprises a cabinet body and a door body arranged on the cabinet body, a gas cylinder is arranged outside the cabinet body, and the gas cylinder is filled with high-pressure carbon dioxide gas; a gas injection pipe is arranged on the bottom wall of the cabinet body, and a gas path on-off mechanism is arranged between the gas injection pipe and the gas cylinder and used for communicating high-pressure carbon dioxide in the gas cylinder into the cabinet body through the gas injection pipe; a smoke sensor is arranged in the cabinet body, the smoke sensor is electrically connected with the gas path on-off mechanism, the interior of the cabinet body is sealed, carbon dioxide is injected into the cabinet body under the action of a gas cylinder, and the carbon dioxide extinguishes a fire source by rapidly reducing the oxygen concentration in the cabinet body; and no residue is left to pollute or damage electrical equipment.

Description

Technical Field

[0001] This invention relates to the field of electrical equipment technology, specifically to a safety electrical switchgear with automatic fire extinguishing capability. Background Technology

[0002] Electrical switchgear (or distribution cabinet) is a device used for the protection, control and distribution of electrical equipment in a power system. It contains various electrical components for switching control of current, overload protection, short circuit protection, etc. Electrical switchgear is generally safe under normal operation, but under abnormal conditions, such as overload, short circuit, electrical fault, or improper maintenance, it may lead to safety hazards such as fire or combustion. Chinese patent CN202021136614.X discloses a safe and reliable high and low voltage switchgear, which includes a cabinet, a placement plate, a dry powder extinguishing agent storage tank, a fire detector, a main controller, and buffer legs. The cabinet shell is composed of a base layer and a high-density board. This technical solution can offset some of the impact force, has the functions of shock absorption and noise reduction, reduces noise pollution, improves protection performance, and can effectively prevent the occurrence of fire. It has high safety and has great promotional value.

[0003] The aforementioned patent uses dry powder extinguishing agents to extinguish fires. While this method can extinguish electrical fires in emergency situations, it has drawbacks in extinguishing fires in electrical switchgear, such as causing equipment damage and making cleanup difficult. Summary of the Invention

[0004] In view of this, the purpose of this invention is to propose a safe electrical switch cabinet with automatic fire extinguishing capability, so as to solve the technical problems of equipment damage and cleaning difficulties caused by dry powder fire extinguishing agents after extinguishing electrical fires.

[0005] To achieve the above objectives, the present invention provides a safety electrical switch cabinet with automatic fire extinguishing capability, comprising a cabinet body and a door mounted on the cabinet body; a gas cylinder is disposed outside the cabinet body, and the gas cylinder is filled with high-pressure carbon dioxide gas. The bottom wall of the cabinet is provided with an injection pipe, and an air passage switching mechanism is provided between the injection pipe and the gas cylinder. The air passage switching mechanism is used to connect the high-pressure carbon dioxide in the gas cylinder to the inside of the cabinet through the injection pipe. The cabinet is equipped with a smoke sensor, which is electrically connected to the gas circuit on / off mechanism.

[0006] Preferably, the air injection pipe penetrates the bottom wall of the cabinet, and the air injection pipe is slidably and sealingly connected to the bottom wall of the cabinet; The gas circuit switching mechanism includes a connecting pipe and a guide pipe. The connecting pipe is fixedly installed at the bottom of the cabinet. The top end of the guide pipe is connected to the gas injection pipe, and the bottom end of the guide pipe is the air inlet. The bottom end of the guide pipe passes through the top end of the connecting pipe and is slidably sealed to it.

[0007] Preferably, the inner wall of the connecting pipe is provided with an inner convex ring, and the side wall of the connecting pipe is provided with an air inlet. The air inlet is located between the inner convex ring and the bottom wall of the connecting pipe, and the air inlet of the connecting pipe is connected to the gas cylinder. The bottom end of the guide tube is provided with a piston ring that is slidably and sealingly connected to the inner wall of the connecting tube. The piston ring is located between the inner convex ring and the bottom wall of the connecting tube. The bottom of the inner convex ring is provided with an elastic element for pushing the piston ring to be below the air inlet of the connecting tube. The inner top wall of the connecting pipe is equipped with an electromagnet for attracting piston rings, and the top of the piston rings is made of ferrous material.

[0008] Preferably, ventilation openings are provided on both sides of the cabinet, and a filter screen is provided on the outer wall of the ventilation opening; The electrical switchgear also includes a sealing assembly for closing the vent, the sealing assembly being drivenly connected to the air injection pipe.

[0009] Preferably, the sealing assembly includes a sealing plate, which is symmetrically arranged on both sides of the cabinet and located inside it, with the sealing plate corresponding to the corresponding ventilation opening; the bottom wall of the cabinet is provided with a sliding groove, through which the sealing plate is slidably connected to the solid. A connecting rod is provided between the sealing plate and the air injection pipe. One end of the connecting rod is hinged to the air injection pipe, and the other end of the connecting rod is hinged to the sealing plate.

[0010] Preferably, the top of the cabinet is provided with an exhaust vent, which is connected to the interior of the cabinet; The top of the cabinet is equipped with a ventilation grille that covers the exhaust vent.

[0011] Preferably, the electrical switch cabinet also includes a top sealing plate and a sealing drive mechanism, wherein the top sealing plate is disposed inside the cabinet and below the exhaust vent; The sealing and pressure driving mechanism is installed inside the cabinet and is used to control the opening and closing of the ventilation opening by the top plate.

[0012] Preferably, a one-way valve is installed on the top plate, with its two ends facing the ventilation opening and the inside of the cabinet, respectively.

[0013] Preferably, the sealing drive mechanism includes a piston cylinder installed inside the cabinet and a piston rod inside the piston cylinder; The inner wall of the cabinet is equipped with a retainer, the piston rod is slidably connected to the retainer, the top end of the piston rod is fixedly connected to the top sealing plate, and the plug at the bottom end of the piston rod is located inside the piston cylinder.

[0014] Preferably, the piston cylinder has an air inlet and an air outlet. The air inlet of the piston cylinder is connected to the air injection pipe through a hose, and the air outlet of the piston cylinder is higher than its air inlet. A limiting plate is provided on the piston rod, and the limiting plate is located above the piston cylinder so that the piston rod plug is located above the air inlet of the piston cylinder.

[0015] The beneficial effects of this invention are: This invention creates a sealed environment inside the cabinet and injects carbon dioxide into it using a gas cylinder. The carbon dioxide extinguishes the fire by rapidly reducing the oxygen concentration inside the cabinet, without leaving any residue that could contaminate or damage the electrical equipment. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ; Figure 2 This is the front view of the present invention; Figure 3 This is a schematic diagram of the first working state of the gas circuit switching mechanism of the present invention; Figure 4 This is a schematic diagram of the second working state of the gas circuit switching mechanism of the present invention; Figure 5 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ; Figure 6 This is a schematic diagram of the internal structure of the sealing and pressure driving mechanism of the present invention.

[0018] The numbers on the map are: 1-Cabinet body; 11-Ventilation opening; 12-Exhaust vent; 2-Door; 3-Gas cylinder; 4-Gas circuit switching mechanism; 41-Connecting pipe; 411-Inner convex ring; 42-Guide pipe; 421-Piston ring; 422-Elastic element; 43-Electromagnet; 5-Injection pipe; 6-Sealing assembly; 61-Sealing plate; 611-Connecting rod; 7-Top sealing plate; 71-One-way valve; 8-Sealing drive mechanism; 81-Piston cylinder; 82-Piston rod; 821-Plug body; 83-Retainer. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0020] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0021] The first aspect of this invention proposes a safety-type electrical switchgear with automatic fire extinguishing capability, such as... Figures 1 to 2 As shown, it includes a cabinet 1 and a door 2 installed on the cabinet 1; a gas cylinder 3 is installed on the outside of the cabinet 1, and the gas cylinder 3 is filled with high-pressure carbon dioxide gas. The bottom wall of the cabinet 1 is provided with an injection pipe 5, and an air passage switching mechanism 4 is provided between the injection pipe 5 and the gas cylinder 3. The air passage switching mechanism 4 is used to connect the high-pressure carbon dioxide in the gas cylinder 3 to the inside of the cabinet 1 through the injection pipe 5. The cabinet 1 is equipped with a smoke sensor, which is electrically connected to the gas circuit on / off mechanism 4.

[0022] The gas cylinder 3 is located below the cabinet 1 of the electrical switch cabinet. The door 2 is connected to the opening of the cabinet 1 by a hinge, and the door 2 can form a seal with the cabinet 1 when closed. This can be achieved by setting a sealing strip on the side of the door 2 near the cabinet 1. like Figure 3 and Figure 4 As shown, further details are as follows: The air injection pipe 5 penetrates the bottom wall of the cabinet 1, and the air injection pipe 5 is slidably and sealingly connected to the bottom wall of the cabinet 1. The gas circuit switching mechanism 4 includes a connecting pipe 41 and a guide pipe 42. The connecting pipe 41 is fixedly installed below the cabinet 1. The top end of the guide pipe 42 is connected to the air injection pipe 5, and the bottom end of the guide pipe 42 is the air inlet. The bottom end of the guide pipe 42 passes through the top end of the connecting pipe 41 and is slidably sealed to it. The inner wall of the connecting pipe 41 is provided with an inner convex ring 411, and the side wall of the connecting pipe 41 is provided with an air inlet. The air inlet is located between the inner convex ring 411 and the bottom wall of the connecting pipe 41, and the air inlet of the connecting pipe 41 is connected to the gas cylinder 3. The bottom end of the guide tube 42 is provided with a piston ring 421 that is slidably and sealingly connected to the inner wall of the connecting tube 41. The piston ring 421 is located between the inner convex ring 411 and the bottom wall of the connecting tube 41. The bottom of the inner convex ring 411 is provided with an elastic element 422 for pushing the piston ring 421 below the air inlet of the connecting tube 41. The inner top wall of the connecting pipe 41 is provided with an electromagnet 43 for attracting the piston ring 421, and the top of the piston ring 421 is made of ferrous material.

[0023] like Figure 1 and Figure 5 As shown, going a step further: Ventilation openings 11 are provided on both sides of the cabinet 1, and a filter screen is provided on the outer wall of the ventilation opening 11; The electrical switch cabinet also includes a sealing assembly 6 for closing the vent 11, the sealing assembly 6 being drivenly connected to the air injection pipe 5.

[0024] like Figure 5 As shown, going a step further: The sealing assembly 6 includes a sealing plate 61, which is symmetrically arranged on both sides of the cabinet 1 and located inside it. The sealing plate 61 corresponds to the corresponding ventilation opening 11. The bottom wall of the cabinet 1 is provided with a sliding groove, and the sealing plate 61 is slidably connected to the solid through the sliding groove. A connecting rod 611 is provided between the sealing plate 61 and the air injection pipe 5. One end of the connecting rod 611 is hinged to the air injection pipe 5, and the other end of the connecting rod 611 is hinged to the sealing plate 61.

[0025] In this embodiment, components such as circuit breakers, contactors, and relays installed inside the electrical switch cabinet may age, experience reduced insulation performance, and develop poor contact as usage time increases. When these faults lead to arcing and combustion, the smoke alarm will send a signal to the controller when it detects smoke inside cabinet 1, thereby activating the gas circuit switching mechanism 4 (smoke alarm not shown in the figure). "A temperature sensor can also be added during actual implementation." Combustion detection inside the electrical switch cabinet is carried out by combining the smoke alarm and the temperature sensor. When both the smoke alarm and the temperature sensor detect smoke and excessive temperature inside the cabinet 1, a signal will be sent to the controller to activate the gas circuit on / off mechanism 4. After the gas circuit switching mechanism 4 is opened, the electromagnet 43 is energized. Since the top of the piston ring 421 is made of ferrous material, the electromagnet 43 will attract the piston ring 421 and drive it to move upward along the axis of the connecting pipe 41, and overcome the preload of the elastic element 422. In this scheme, the elastic element 422 is preferably a spring. After the piston ring 421 moves upward above the air inlet of the connecting pipe 41, the gas cylinder 3 and the air inlet at the bottom of the guide pipe 42 form a passage. Carbon dioxide gas enters the gas injection pipe 5 through the guide pipe 42 and fills the inside of the cabinet 1. During the upward movement of the guide tube 42, the air injection tube 5 will be driven to move along with it. During the movement of the air injection tube 5, since the sealing plate 61 is slidably connected to the bottom wall of the cabinet 1 through the sliding groove and the sliding path is towards the vent 11, the sealing plate 61 will be driven to move towards the vent 11 and close it through the connecting rod 611 when the air injection tube 5 rises. At this time, the inside of cabinet 1 will be sealed, and carbon dioxide will be injected into it under the action of gas cylinder 3. The carbon dioxide will extinguish the fire by rapidly reducing the oxygen concentration inside cabinet 1, and will not leave any residue to cause pollution or damage to electrical equipment.

[0026] Because after a fire starts inside the electrical switchgear, it takes time for carbon dioxide to be introduced and reduce the oxygen concentration remaining inside cabinet 1. To further reduce the combustion area, such as... Figure 1 As shown: The top of the cabinet 1 is provided with an exhaust vent 12, which is connected to the interior of the cabinet 1; A ventilation grille is installed on the top of the cabinet 1, and the ventilation grille covers the exhaust vent 12.

[0027] In this embodiment, due to the principle that oxygen is lighter than carbon dioxide, an exhaust vent 12 is opened at the top of the cabinet 1. During the process of injecting carbon dioxide at the bottom of the cabinet 1, the air and oxygen originally inside the cabinet 1 will be pushed out through the exhaust vent 12, thereby directly forming a carbon dioxide cover on the fire source, avoiding the need to further inject carbon dioxide to reduce the oxygen concentration for fire extinguishing.

[0028] To prevent the fire from reigniting due to air flowing back through the exhaust vents from outside cabinet 1 during firefighting, such as... Figure 2 As shown, going a step further: The electrical switch cabinet also includes a top sealing plate 7 and a sealing drive mechanism 8. The top sealing plate 7 is located inside the cabinet 1 and below the exhaust port 12. The sealing drive mechanism 8 is installed inside the cabinet 1. The sealing drive mechanism 8 is used to control the opening and closing of the ventilation opening 11 by the top plate.

[0029] like Figure 2 As shown, going a step further: A one-way valve 71 is installed on the top plate, with its two ends facing the ventilation opening 11 and the inside of the cabinet 1, respectively.

[0030] like Figure 6 As shown, further details are as follows: The sealing drive mechanism 8 includes a piston cylinder 81 installed inside the cabinet 1, and a piston rod 82 inside the piston cylinder 81; The inner wall of the cabinet 1 is provided with a retainer 83, the piston rod 82 is slidably connected to the retainer 83, the top end of the piston rod 82 is fixedly connected to the top sealing plate 7, and the plug 821 at the bottom end of the piston rod 82 is located inside the piston cylinder 81. The piston cylinder 81 has an air inlet and an air outlet. The air inlet of the piston cylinder 81 is connected to the air injection pipe 5 through a hose, and the air outlet of the piston cylinder 81 is higher than its air inlet. A limiting piece is provided on the piston rod 82, and the limiting piece is located above the piston cylinder 81 so that the plug body 821 of the piston rod 82 is located above the air inlet of the piston cylinder 81.

[0031] In this embodiment, when the gas cylinder 3 and the air inlet at the bottom of the guide tube 42 form a passage, carbon dioxide gas enters the gas injection tube 5 through the guide tube 42 and is then injected into the piston cylinder 81 through the hose. The carbon dioxide gas injected into the piston cylinder 81 will drive the piston rod 82 to move upward through the plug 821. The upward movement of the piston rod 82 will drive the top sealing plate 7 to seal the exhaust port of the cabinet 1. "The exhaust port also serves the purpose of ventilating the interior of the cabinet 1 under normal conditions." After the exhaust port is sealed, the one-way valve 71 begins to play its role. In this solution, the one-way valve 71 can be a one-way silicone valve, but it is not limited to this. When the top sealing plate 7 completes the sealing of the exhaust port of the cabinet 1, the piston rod 82 will move upward along the axis of the piston cylinder 81 until its plug 821 is above the air inlet of the piston cylinder 81. At this time, the air outlet of the piston cylinder 81 is connected to its air inlet, forming a mode in which the exhaust port of the cabinet 1 "only goes out and does not go in" under the action of the one-way valve 71, avoiding the backflow of external air and oxygen, and the carbon dioxide gas filling the interior of the cabinet 1 from bottom to top.

[0032] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in the details for the sake of brevity.

[0033] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A safety electrical switchgear with automatic fire extinguishing capability, characterized in that, It includes a cabinet (1) and a door (2) installed on the cabinet (1); a gas cylinder (3) is installed on the outside of the cabinet (1), and the gas cylinder (3) is filled with high-pressure carbon dioxide gas. The bottom wall of the cabinet (1) is provided with an injection pipe (5), and an air passage switching mechanism (4) is provided between the injection pipe (5) and the gas cylinder (3). The air passage switching mechanism (4) is used to connect the high-pressure carbon dioxide in the gas cylinder (3) to the inside of the cabinet (1) through the injection pipe (5). The cabinet (1) is equipped with a smoke sensor inside, and the smoke sensor is electrically connected to the gas circuit on / off mechanism (4).

2. The safety electrical switchgear with automatic fire extinguishing capability according to claim 1, characterized in that, The air injection pipe (5) penetrates the bottom wall of the cabinet (1), and the air injection pipe (5) is slidably and sealed to the bottom wall of the cabinet (1); The gas circuit switching mechanism (4) includes a connecting pipe (41) and a guide pipe (42). The connecting pipe (41) is fixedly installed below the cabinet (1). The top end of the guide pipe (42) is connected to the air injection pipe (5), the bottom end of the guide pipe (42) is the air inlet, and the bottom end of the guide pipe (42) passes through the top end of the connecting pipe (41) and is slidably sealed to it.

3. The safety electrical switchgear with automatic fire extinguishing capability according to claim 2, characterized in that, The inner wall of the connecting pipe (41) is provided with an inner convex ring (411), and the side wall of the connecting pipe (41) is provided with an air inlet. The air inlet is located between the inner convex ring (411) and the bottom wall of the connecting pipe (41). The air inlet of the connecting pipe (41) is connected to the gas cylinder (3). The bottom end of the guide tube (42) is provided with a piston ring (421) that is slidably and sealingly connected to the inner wall of the connecting tube (41). The piston ring (421) is located between the inner convex ring (411) and the bottom wall of the connecting tube (41). The bottom of the inner convex ring (411) is provided with an elastic element (422) for pushing the piston ring (421) below the air inlet of the connecting tube (41). The inner top wall of the connecting pipe (41) is provided with an electromagnet (43) for attracting the piston ring (421), and the top of the piston ring (421) is made of ferrous material.

4. The safety electrical switchgear with automatic fire extinguishing capability according to claim 3, characterized in that, Ventilation openings (11) are provided on both sides of the cabinet (1), and a filter screen is provided on the outer wall of the ventilation openings (11); The electrical switch cabinet also includes a sealing assembly (6) for closing the vent (11), the sealing assembly (6) being drivenly connected to the air injection pipe (5).

5. The safety electrical switchgear with automatic fire extinguishing capability according to claim 4, characterized in that, The sealing assembly (6) includes a sealing plate (61), which is symmetrically arranged on both sides of the cabinet (1) and located inside it. The sealing plate (61) corresponds to the corresponding ventilation opening (11). The bottom wall of the cabinet (1) is provided with a sliding groove, and the sealing plate (61) is slidably connected to the solid through the sliding groove; A connecting rod (611) is provided between the sealing plate (61) and the air injection pipe (5). One end of the connecting rod (611) is hinged to the air injection pipe (5), and the other end of the connecting rod (611) is hinged to the sealing plate (61).

6. The safety electrical switchgear with automatic fire extinguishing capability according to claim 1, characterized in that, The top of the cabinet (1) is provided with an exhaust vent (12), which is connected to the interior of the cabinet (1); The top of the cabinet (1) is equipped with a ventilation grille that covers the exhaust vent (12).

7. The safety electrical switchgear with automatic fire extinguishing capability according to claim 6, characterized in that, The electrical switch cabinet also includes a top sealing plate (7) and a sealing drive mechanism (8). The top sealing plate (7) is located inside the cabinet (1) and below the exhaust vent (12). The sealing drive mechanism (8) is installed inside the cabinet (1). The sealing drive mechanism (8) is used to control the opening and closing of the ventilation opening (11) by the top plate.

8. The safety electrical switchgear with automatic fire extinguishing capability according to claim 7, characterized in that, A one-way valve (71) is installed on the top plate, with the two ends of the one-way valve (71) facing the ventilation opening (11) and the inside of the cabinet (1), respectively.

9. The safety electrical switchgear with automatic fire extinguishing capability according to claim 7, characterized in that, The sealing drive mechanism (8) includes a piston cylinder (81) installed inside the cabinet (1) and a piston rod (82) inside the piston cylinder (81). The inner wall of the cabinet (1) is provided with a retainer (83), the piston rod (82) is slidably connected to the retainer (83), the top end of the piston rod (82) is fixedly connected to the top sealing plate (7), and the plug (821) at the bottom end of the piston rod (82) is located inside the piston cylinder (81).

10. The safety electrical switchgear with automatic fire extinguishing capability according to claim 9, characterized in that, The piston cylinder (81) has an air inlet and an air outlet. The air inlet of the piston cylinder (81) is connected to the air injection pipe (5) through a hose, and the air outlet of the piston cylinder (81) is higher than its air inlet. A limiting piece is provided on the piston rod (82), and the limiting piece is located above the piston cylinder (81) so that the plug (821) of the piston rod (82) is located above the air inlet of the piston cylinder (81).

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