Safe pressure regulating cabinet convenient for medium-low pressure bleeding operation

Abstract

The utility model provides a safety pressure regulating cabinet convenient for medium and low pressure relief operation, a pressure regulating pipeline is provided with two pipelines, one end of the pressure regulating pipeline is used for being connected with a gas supply pipe, the other end of the pressure regulating pipeline is used for being connected with a gas outlet pipe, a pressure regulator is arranged on the pressure regulating pipeline, the pressure regulating pipeline is divided into a medium pressure area and a low pressure area by the pressure regulator, and the medium pressure area is communicated with the low pressure area. A first exhaust valve is arranged on the medium-pressure area, a second exhaust valve is arranged on the low-pressure area, one end of the bleeder is connected with the low-pressure area, a first air inlet valve is arranged on the bleeder, and the exhaust pipe is detachably arranged between the first exhaust valve and the first air inlet valve or between the second exhaust valve and the first air inlet valve. Through the arrangement of the exhaust pipe, a pressure regulating pipeline needing diffusing operation can be connected with the diffusing pipe, fuel gas is exhausted through the diffusing pipe, the gas outlet end of the diffusing pipe is located at a high position, diffusing can be safely carried out, in addition, compared with the mode that the exhaust pipe is fixed to a pressure regulating cabinet body for diffusing, fixing can be more convenient, and the safety is higher. And the convenience of diffusion operation is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of voltage regulating cabinets, and more specifically, relates to a safety voltage regulating cabinet which is convenient for medium and low voltage release operations. Background Art

[0002] Gas pressure regulating cabinet is a device used for gas supply in residential areas, hotels, factories, schools and other units. Gas pressure regulating cabinet (station) is specially designed and manufactured according to the characteristics of industrial gas (sudden flow change, rapid opening and closing, uninterrupted gas supply).

[0003] The so-called release operation refers to the discharge of gas from the pipeline in the pressure regulating cabinet. The daily operation of the pipeline network often involves the release operation of the pressure regulating cabinet. At present, the release operation of the pressure regulating cabinet generally uses the hose connected to the front and rear holes of the pressure regulator to discharge directly. Due to the flammability of the gas, in order to ensure the safety of the release operation, the release height should be kept above 2 meters. It is often necessary to fix the hose to the pressure regulating cabinet. Because the released gas is under pressure, the hose is often not fixed firmly, which poses a safety risk. Utility Model Content

[0004] The utility model aims to provide a safe voltage regulating cabinet which is convenient for medium and low pressure release operation, so as to improve the safety of the release operation of the voltage regulating cabinet.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a safety pressure regulating cabinet which is convenient for medium and low pressure release operation, including a cabinet body, two pressure regulating pipelines, a release pipe, an exhaust pipe and a cleaning mechanism, wherein a mounting cavity is provided inside the cabinet body; the two pressure regulating pipelines are arranged in parallel, one end of the pressure regulating pipeline is used to be connected to the air supply pipe, and the other end of the pressure regulating pipeline is used to be connected to the air outlet pipe, a pressure regulator is provided on the pressure regulating pipeline, and the pressure regulator divides the pressure regulating pipeline into an upstream medium pressure zone and a downstream low pressure zone, and a first exhaust valve is provided on the medium pressure zone , a second exhaust valve is provided on the low-pressure area, and various components for pressure regulation are provided on the pressure regulating pipeline; one end of the vent pipe is connected to the low-pressure area, and the other end of the vent pipe extends upward to the top of the cabinet, an air pressure valve is provided on the vent pipe, and a first air inlet valve is provided on the vent pipe; the exhaust pipe is detachably arranged between the first exhaust valve and the first air inlet valve, or the vent pipe is detachably arranged between the second exhaust valve and the first air inlet valve; a cleaning mechanism is connected to the vent pipe, and the cleaning mechanism is used to apply negative pressure to the vent pipe.

[0006] In a possible implementation, the pressure regulating pipeline includes a first pipeline and a second pipeline, wherein the air inlet end of the first pipeline is provided with a first valve, and the air outlet end of the first pipeline is provided with a second valve; the air inlet end of the second pipeline is provided with a third valve, and the air outlet end of the second pipeline is provided with a fourth valve; the top of the air supply pipe is provided with a first inlet pipe and a second inlet pipe, the bottom end of the first inlet pipe is connected to the air supply pipe, the second inlet pipe is connected to the first inlet pipe through a horizontally arranged first transverse pipe, the first inlet pipe is connected to the first valve, and the second inlet pipe is connected to the third valve; the top of the air outlet pipe is provided with a first outlet pipe and a second outlet pipe, the bottom end of the first outlet pipe is connected to the air outlet pipe, the second outlet pipe is connected to the first outlet pipe through a horizontally arranged second transverse pipe, the first outlet pipe is connected to the third valve, the second outlet pipe is connected to the fourth valve, and the bottom of the vent pipe is connected to the second transverse pipe.

[0007] In a possible implementation, a relief valve is provided on the relief pipe, and the relief valve is provided between the air pressure valve and the first air inlet valve.

[0008] In a possible implementation, the cleaning mechanism includes a first air inlet pipe, a second air inlet pipe, an air suction assembly and a first one-way valve, wherein the first air inlet pipe is arranged in the medium-pressure zone, and the first air inlet pipe is provided with a second air inlet valve; the second air inlet pipe is arranged in the low-pressure zone, and the second air inlet pipe is provided with a third air inlet valve; the air suction assembly is connected to the discharge pipe, and the air supply pipe of the air suction assembly is connected to the discharge pipe; the first one-way valve is arranged at the top end of the discharge pipe, and the first one-way valve constitutes a one-way conduction from the inside of the discharge pipe to the outside of the discharge pipe.

[0009] In one possible implementation, a second one-way valve is provided at the top of the first intake pipe, and the second one-way valve constitutes a one-way passage from the outside of the first intake pipe to the inside of the first intake pipe; a third one-way valve is provided at the top of the second intake pipe, and the third one-way valve constitutes a one-way passage from the outside of the second intake pipe to the inside of the second intake pipe.

[0010] In one possible implementation, the air intake assembly includes a negative pressure box, a slide, a driving member and a sealing member, wherein a negative pressure chamber is provided inside the negative pressure box, a connecting pipe is provided at one end of the negative pressure box, and the connecting pipe is connected to the discharge pipe; the slide is slidably arranged in the negative pressure box; the driving member is arranged on the negative pressure box, the power output end of the driving member is connected to the slide, and the driving member is used to drive the slide to slide; the sealing member is arranged between the slide and the negative pressure box, so that when the slide slides to the side away from the connecting pipe, the negative pressure chamber between the slide and the connecting pipe is at negative pressure.

[0011] In a possible implementation, the driving member is any one of a linear motor, a cylinder and a hydraulic cylinder.

[0012] In a possible implementation, the seal includes a sealing groove and a sealing ring, the sealing groove is arranged on the side wall of the slide plate; the sealing ring is arranged in the sealing groove, a part of the sealing ring is arranged outside the sealing groove, and the sealing ring abuts against the inner wall of the negative pressure box.

[0013] In one possible implementation, the seal includes a telescopic bellows, one end of which is disposed on the slide plate, the other end of which is disposed on the inner wall of the negative pressure box, and the connecting pipe is connected to the telescopic bellows, and the slide plate can stretch or compress the telescopic bellows due to sliding.

[0014] The beneficial effect of the safe pressure regulating cabinet for medium and low pressure release operations provided by the utility model is that: compared with the prior art, the utility model sets two parallel pressure regulating pipelines, so that when one of the pressure regulating pipelines needs to be released, the other pressure regulating pipeline can be connected to the gas transmission pipeline without affecting the transmission of the gas, and by setting an exhaust pipe, the pressure regulating pipeline that needs to be released can be connected to the release pipe, so that the gas is discharged through the release pipe, and because the gas outlet end of the release pipe is at a high place, it can be released safely. In addition, compared with fixing the exhaust pipe on the pressure regulating cabinet for release, it can be more convenient to fix, thereby improving the convenience of the release operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 A schematic diagram of the structure of the medium pressure zone during the release operation provided by the embodiment of the utility model;

[0017] Figure 2 A schematic diagram of the structure of the low-pressure zone release operation provided by the embodiment of the utility model;

[0018] Figure 3 A schematic diagram of the structure of the air intake assembly in one state provided by an embodiment of the utility model;

[0019] Figure 4 This is a schematic structural diagram of the air intake assembly in another state provided by an embodiment of the utility model.

[0020] Among them, the reference numerals in the figures are as follows:

[0021] 1. Pressure regulating pipeline; 2. Vent pipe; 3. Exhaust pipe; 4. Air suction assembly;

[0022] 101, air supply pipe; 102, air outlet pipe; 103, pressure regulator; 104, medium pressure area; 105, low pressure area; 106, first exhaust valve; 107, second exhaust valve; 108, first pipeline; 109, second pipeline; 110, first valve; 111, second valve; 112, third valve; 113, fourth valve; 114, first inlet pipe; 115, second inlet pipe; 116, first transverse pipe; 117, first outlet pipe; 118, second outlet pipe; 119, second transverse pipe;

[0023] 201, air pressure valve; 202, first air inlet valve; 203, relief valve; 204, first non-return valve;

[0024] 401, first air inlet pipe; 402, second air inlet valve; 403, second air inlet pipe; 404, third air inlet valve; 405, second one-way valve; 406, third one-way valve; 407, negative pressure box; 408, slide plate; 409, driving member; 410, telescopic bellows; 411, connecting pipe. DETAILED DESCRIPTION

[0025] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0026] It should be further explained that the drawings and implementation modes of the present invention mainly describe the concept of the present invention. On the basis of this concept, the specific forms and settings of some connection relationships, positional relationships, power mechanisms, power supply systems, hydraulic systems and control systems may not be fully described. However, on the premise that those skilled in the art understand the concept of the present invention, those skilled in the art can implement the above-mentioned specific forms and settings in a well-known manner.

[0027] When an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element.

[0028] The directions or positional relationships indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0029] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, "multiple" means two or more, and "several" means one or more, unless otherwise clearly and specifically defined.

[0030] The safety voltage regulating cabinet provided by the utility model and convenient for medium and low pressure release operation is now described.

[0031] Please also read Figure 1 and Figure 2 The safety pressure regulating cabinet for medium and low pressure release operation comprises a cabinet, two pressure regulating pipelines 1, a release pipe 2, an exhaust pipe 3 and a cleaning mechanism, wherein a mounting cavity is provided inside the cabinet. The two pressure regulating pipelines 1 are arranged in parallel, one end of the pressure regulating pipeline 1 is used to connect with the air supply pipe 101, and the other end of the pressure regulating pipeline 1 is used to connect with the air outlet pipe 102. The pressure regulating pipeline 1 is provided with a pressure regulator 103, and the pressure regulator 103 divides the pressure regulating pipeline 1 into an upstream medium pressure area 104 and a downstream low pressure area 105. The medium pressure area 104 is provided with a first exhaust valve 106, and the low pressure area 105 is provided with a second exhaust valve 107. The pressure regulating pipeline 1 is provided with various components for pressure regulation. One end of the release pipe 2 is connected to the low pressure area 105, and the other end of the release pipe 2 extends upward to the top of the cabinet. The release pipe 2 is provided with an air pressure valve 201, and the release pipe 2 is provided with a first air inlet valve 202. The exhaust pipe 3 is detachably disposed between the first exhaust valve 106 and the first intake valve 202, or the vent pipe 2 is detachably disposed between the second exhaust valve 107 and the first intake valve 202. The cleaning mechanism is connected to the vent pipe 2, and the cleaning mechanism is used to apply negative pressure to the vent pipe 2.

[0032] The beneficial effects of the safety pressure regulating cabinet for medium and low pressure release operations provided by the present embodiment are as follows: compared with the prior art, the safety pressure regulating cabinet for medium and low pressure release operations provided by the present embodiment is provided with two parallel pressure regulating pipelines 1, so that when one of the pressure regulating pipelines 1 needs to be released, the other pressure regulating pipeline 1 can be connected to the gas transmission pipeline without affecting the transportation of the gas, and by providing the exhaust pipe 3, the pressure regulating pipeline 1 that needs to be released can be connected to the release pipe 2, so that the gas can be discharged through the release pipe 2, and since the gas outlet end of the release pipe 2 is at a high place, it can be released safely. In addition, compared with fixing the exhaust pipe 3 on the pressure regulating cabinet body for release, it can be more convenient to fix, thereby improving the convenience of the release operation.

[0033] In addition, the setting of the air pressure valve 201 ensures that when the pressure in the low pressure area 105 is higher than the preset pressure, the gas in the low pressure area 105 will enter the rear of the air pressure valve 201 and be discharged to maintain the preset pressure in the low pressure area 105.

[0034] like Figure 1 and Figure 2 As shown, the pressure regulating pipeline 1 includes a first pipeline 108 and a second pipeline 109, wherein a first valve 110 is provided at the air inlet end of the first pipeline 108, and a second valve 111 is provided at the air outlet end of the first pipeline 108. A third valve 112 is provided at the air inlet end of the second pipeline 109, and a fourth valve 113 is provided at the air outlet end of the second pipeline 109. A first inlet pipe 114 and a second inlet pipe 115 are provided at the top of the air supply pipe 101, the bottom end of the first inlet pipe 114 is connected to the air supply pipe 101, the second inlet pipe 115 is connected to the first inlet pipe 114 through a horizontally arranged first transverse pipe 116, the first inlet pipe 114 is connected to the first valve 110, and the second inlet pipe 115 is connected to the third valve 112. A first outlet pipe 117 and a second outlet pipe 118 are provided at the top of the outlet pipe 102, the bottom end of the first outlet pipe 117 is connected to the outlet pipe 102, the second outlet pipe 118 is connected to the first outlet pipe 117 through a horizontally arranged second transverse pipe 119, the first outlet pipe 117 is connected to the third valve 112, the second outlet pipe 118 is connected to the fourth valve 113, and the bottom of the discharge pipe 2 is connected to the second transverse pipe 119.

[0035] In actual operation, the second pipeline 109 can be connected to the gas pipeline by simply closing the first valve 110 and opening the third valve 112; or the first pipeline 108 can be connected to the gas pipeline by closing the third valve 112 and opening the first valve 110. In addition, when the first pipeline 108 needs to be vented, the first valve 110 and the second valve 111 are closed; when the second pipeline 109 needs to be vented, the third valve 112 and the fourth valve 113 are closed.

[0036] In order to prevent the gas from entering the low-pressure zone 105 from the release pipe 2 due to excessive gas pressure during the release operation in the medium-pressure zone 104, a release valve 203 is provided on the release pipe 2. The release valve 203 is provided between the air pressure valve 201 and the first air inlet valve 202. When release operation is required, the release valve 203 is closed.

[0037] In this embodiment, the cleaning mechanism includes a first air inlet pipe 401, a second air inlet pipe 403, an air suction assembly 4 and a first one-way valve 204, wherein the first air inlet pipe 401 is arranged in the medium pressure area 104, and the first air inlet pipe 401 is provided with a second air inlet valve 402. The second air inlet pipe 403 is arranged in the low pressure area 105, and the second air inlet pipe 403 is provided with a third air inlet valve 404. The air suction assembly 4 is connected to the discharge pipe 2, and the air supply pipe 101 of the air suction assembly 4 is connected to the discharge pipe 2. The first one-way valve 204 is arranged at the top end of the discharge pipe 2, and the first one-way valve 204 constitutes a one-way conduction from the inside of the discharge pipe 2 to the outside of the discharge pipe 2.

[0038] The first one-way valve 204 is set so that when the air intake component 4 inhales, the air outside the discharge pipe 2 will not enter the air intake component 4, and only the gas in the medium pressure area 104 or the low pressure area 105 will be sucked into the air intake component 4. In addition, the first air intake pipe 401 and the second air intake pipe 403 are set so that when the air intake component 4 inhales, the external air will enter the pipeline, and the pressure regulating pipeline 1 will present a negative pressure, making it difficult for the air intake component 4 to inhale. At the same time, when the air intake component 4 is exhausted, the air will only be discharged from the position of the first one-way valve 204.

[0039] In this embodiment, a second one-way valve 405 is provided at the top of the first air inlet pipe 401, and the second one-way valve 405 constitutes a one-way communication from the outside of the first air inlet pipe 401 to the inside of the first air inlet pipe 401. A third one-way valve 406 is provided at the top of the second air inlet pipe 403, and the third one-way valve 406 constitutes a one-way communication from the outside of the second air inlet pipe 403 to the inside of the second air inlet pipe 403. The first one-way valve 204 and the second one-way valve 405 are provided to prevent the gas in the pressure regulating pipeline 1 from being discharged into the air through the first air inlet pipe 401 or the second air inlet pipe 403.

[0040] Preferably, the air suction assembly 4 includes a negative pressure box 407, a slide plate 408, a driving member 409 and a sealing member, wherein a negative pressure chamber is provided inside the negative pressure box 407, and a connecting pipe 411 is provided at one end of the negative pressure box 407, and the connecting pipe 411 is connected to the discharge pipe 2. The slide plate 408 is slidably arranged in the negative pressure box 407. The driving member 409 is arranged on the negative pressure box 407, and the power output end of the driving member 409 is connected to the slide plate 408, and the driving member 409 is used to drive the slide plate 408 to slide. The sealing member is arranged between the slide plate 408 and the negative pressure box 407, so that when the slide plate 408 slides to the side away from the connecting pipe 411, the negative pressure chamber between the slide plate 408 and the connecting pipe 411 is negatively pressurized, and then the gas in the medium pressure area 104 or the low pressure area 105 is sucked into the negative pressure box 407 through the connecting pipe 411.

[0041] Specifically, the driving member 409 is any one of a linear motor, a cylinder and a hydraulic cylinder, so that the driving member 409 is easy to obtain and convenient to use.

[0042] As an embodiment, the sealing member includes a sealing groove and a sealing ring, and the sealing groove is provided on the side wall of the slide plate 408. The sealing ring is provided in the sealing groove, and a part of the sealing ring is provided outside the sealing groove, and the sealing ring abuts against the inner wall of the negative pressure box 407. The setting of the sealing ring makes the slide plate 408 and the inner wall of the negative pressure box 407 sealed, and the negative pressure box 407 completes the suction of the medium pressure area 104 or the low pressure area 105 by sliding the slide plate 408.

[0043] like Figure 3 and Figure 4 As shown, as another embodiment, the sealing member includes a telescopic bellows 410, one end of which is disposed on a slide plate 408, and the other end of the telescopic bellows 410 is disposed on an inner wall of a negative pressure box 407, and a connecting tube 411 is connected to the telescopic bellows 410, and the slide plate 408 can stretch or compress the telescopic bellows 410 by sliding, thereby completing the suction or exhaust of the negative pressure box 407 to the medium pressure zone 104 or the low pressure zone 105.

[0044] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A safety voltage regulating cabinet that is convenient for medium and low pressure release operations, characterized in that: include: A cabinet body, wherein a mounting cavity is provided inside; A pressure regulating pipeline (1) has two pipelines arranged in parallel, one end of the pressure regulating pipeline (1) is used to be connected to an air supply pipe (101), and the other end of the pressure regulating pipeline (1) is used to be connected to an air outlet pipe (102), a pressure regulator (103) is provided on the pressure regulating pipeline (1), and the pressure regulator (103) divides the pressure regulating pipeline (1) into an upstream medium-pressure area (104) and a downstream low-pressure area (105), the medium-pressure area (104) is provided with a first exhaust valve (106), and the low-pressure area (105) is provided with a second exhaust valve (107), and various components for pressure regulation are provided on the pressure regulating pipeline (1); A vent pipe (2), one end of which is connected to the low-pressure area (105), and the other end of which extends upward to the top of the cabinet. The vent pipe (2) is provided with an air pressure valve (201), and the vent pipe (2) is provided with a first air inlet valve (202); The exhaust pipe (3) is detachably arranged between the first exhaust valve (106) and the first intake valve (202), or the vent pipe (2) is detachably arranged between the second exhaust valve (107) and the first intake valve (202); A cleaning mechanism is connected to the emission pipe (2), and the cleaning mechanism is used to apply negative pressure to the emission pipe (2).

2. The safety voltage regulating cabinet for medium and low pressure release operation as claimed in claim 1 is characterized in that: The pressure regulating pipeline comprises: A first pipeline (108), wherein a first valve (110) is provided at an air inlet end of the first pipeline (108), and a second valve (111) is provided at an air outlet end of the first pipeline (108); A second pipeline (109), wherein a third valve (112) is provided at an air inlet end of the second pipeline (109), and a fourth valve (113) is provided at an air outlet end of the second pipeline (109); A first inlet pipe (114) and a second inlet pipe (115) are provided at the top end of the air supply pipe (101); the bottom end of the first inlet pipe (114) is connected to the air supply pipe (101); the second inlet pipe (115) is connected to the first inlet pipe (114) via a first horizontal pipe (116) arranged horizontally; the first inlet pipe (114) is connected to the first valve (110); and the second inlet pipe (115) is connected to the third valve (112); A first outlet pipe (117) and a second outlet pipe (118) are provided at the top end of the outlet pipe (102); the bottom end of the first outlet pipe (117) is connected to the outlet pipe (102); the second outlet pipe (118) is connected to the first outlet pipe (117) via a second horizontal pipe (119) arranged horizontally; the first outlet pipe (117) is connected to the third valve (112); the second outlet pipe (118) is connected to the fourth valve (113); and the bottom of the discharge pipe (2) is connected to the second horizontal pipe (119).

3. The safety voltage regulating cabinet for medium and low pressure release operation as claimed in claim 2 is characterized in that: The relief pipe (2) is provided with a relief valve (203), and the relief valve (203) is arranged between the air pressure valve (201) and the first air inlet valve (202).

4. The safety voltage regulating cabinet for medium and low pressure release operation as claimed in claim 3 is characterized in that: The cleaning mechanism comprises: A first air intake pipe (401) is disposed in the medium pressure area (104), and a second air intake valve (402) is disposed on the first air intake pipe (401); A second air intake pipe (403) is disposed in the low-pressure area (105), and a third air intake valve (404) is disposed on the second air intake pipe (403); An air intake component (4) is connected to the discharge pipe (2); an air supply pipe (101) of the air intake component (4) is connected to the discharge pipe (2); A first one-way valve (204) is arranged at the top end of the discharge pipe (2), and the first one-way valve (204) constitutes a one-way conduction from the inside of the discharge pipe (2) to the outside of the discharge pipe (2).

5. The safety voltage regulating cabinet for medium and low pressure release operation as claimed in claim 4 is characterized in that: A second one-way valve (405) is provided at the top of the first air intake pipe (401), and the second one-way valve (405) forms a one-way passage from the outside of the first air intake pipe (401) to the inside of the first air intake pipe (401); A third one-way valve (406) is provided at the top of the second air intake pipe (403), and the third one-way valve (406) constitutes a one-way passage from the outside of the second air intake pipe (403) to the inside of the second air intake pipe (403).

6. The safety voltage regulating cabinet for medium and low pressure release operation as claimed in claim 5 is characterized in that: The air intake assembly comprises: A negative pressure box (407) is provided with a negative pressure chamber inside, and a connecting pipe (411) is provided at one end of the negative pressure box (407), and the connecting pipe (411) is connected to the discharge pipe (2); A slide plate (408) slidably disposed in the negative pressure box (407); A driving member (409) is arranged on the negative pressure box (407), a power output end of the driving member (409) is connected to the slide plate (408), and the driving member (409) is used to drive the slide plate (408) to slide; A sealing member is disposed between the slide plate (408) and the negative pressure box (407) so that when the slide plate (408) slides toward a side away from the connecting tube (411), the negative pressure chamber between the slide plate (408) and the connecting tube (411) is under negative pressure.

7. The safety voltage regulating cabinet for medium and low pressure release operation as claimed in claim 6, characterized in that: The driving member (409) is any one of a linear motor, a cylinder and a hydraulic cylinder.

8. The safety voltage regulating cabinet for medium and low pressure release operation as claimed in claim 6 is characterized in that: The sealing element comprises: A sealing groove, provided on the side wall of the slide plate (408); A sealing ring is arranged in the sealing groove, a part of the sealing ring is arranged outside the sealing groove, and the sealing ring abuts against the inner wall of the negative pressure box (407).

9. The safety voltage regulating cabinet for medium and low pressure release operation as claimed in claim 6, characterized in that: The sealing element comprises: A telescopic bellows (410) has one end disposed on the slide plate (408), and the other end of the telescopic bellows (410) is disposed on the inner wall of the negative pressure box (407), and the connecting pipe (411) is in communication with the telescopic bellows (410), so that the slide plate (408) can stretch or compress the telescopic bellows (410) by sliding.

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