A safe positive pressure ventilation explosion-proof PLC cabinet

Abstract

The utility model discloses a safe positive pressure ventilation explosion-proof PLC cabinet, which relates to the technical field of PLC cabinet explosion-proof. The safe positive pressure ventilation explosion-proof PLC cabinet comprises a main cabinet, a control box is fixedly installed on the side of the main cabinet, a supporting plate is arranged on the other side of the main cabinet, a bottom plate is fixedly installed on the side of the main cabinet corresponding to the bottom end of the supporting plate, an explosion-proof structure is arranged on the bottom plate, and the explosion-proof structure comprises two buffer simple columns, the two buffer simple columns are fixedly installed on the bottom plate, two buffer sleeves are fixedly installed on the side of the two buffer simple columns close to the main cabinet, and a slide block cooperates with a hollow rod with strip through holes at both ends to achieve a pressure relief effect on the cabinet body, and when the internal pressure of the cabinet body is relatively small, the slide block is pushed to leave the inside of the hollow rod through the action of the pressure relief spring, and at this time, the gas in the main cabinet is no longer discharged from the strip holes at both ends of the hollow rod under the blocking effect of the slide block, thereby increasing the pressure inside the main cabinet to achieve a dynamic adjustment of the pressure inside the cabinet body.

Description

Technical Field

[0001] The utility model relates to the technical field of explosion-proof PLC cabinets, in particular to a safe positive pressure ventilation explosion-proof PLC cabinet. Background Art

[0002] With the rapid development of kerosene chemical, metal smelting, chemical pharmaceutical and other industries, positive pressure ventilation explosion-proof cabinets are used more and more widely in system control. Positive pressure ventilation explosion-proof cabinets are suitable for explosive and hazardous environments such as petroleum and petrochemical, chemical, brewing, medicine, paint, textile, printing and dyeing, and military facilities.

[0003] The currently published patent: CN202222204969.3 discloses a positive pressure ventilation explosion-proof cabinet, including a main cabinet and a control box; a cabinet door is installed on the main cabinet, at least one mounting plate is installed inside the main cabinet, a plurality of main cabinet lower sealing joints are installed on the bottom wall of the main cabinet, and a plurality of main cabinet side sealing joints are installed on the side wall; a window is provided on the front of the control box and a control box front cover is installed on the window, an indicator light and a selection switch are installed on the control box front cover, and a control box sealing joint is installed on the top of the control box; it also includes an air pressure control assembly, the air pressure control assembly includes a filter pressure reducing valve, the outlet of which is connected to an air blowing port of the main cabinet through a pipeline and a pressure regulating valve is installed on the pipeline, the outlet of the filter pressure reducing valve is connected to another air blowing port of the main cabinet through another pipeline and an explosion-proof coil is installed on the pipeline, and the air pressure control assembly also includes an air pressure switch installed on the main cabinet.

[0004] When the above-mentioned existing explosion-proof cabinet is in use, the air pressure control assembly composed of the filter pressure reducing valve, the pressure regulating valve, the explosion-proof coil and the related pipelines, when the air pressure inside the cabinet is too low, the air is blown through the air source channel to restore the internal environmental air pressure. However, the following problems will occur during the use of this solution: when the air pressure inside the cabinet is too high, the above-mentioned existing explosion-proof cabinet cannot release the pressure in time, and the staff can only adjust the pressure reducing valve after the system alarm, and the pressure inside the cabinet cannot be dynamically adjusted.

[0005] In order to solve the above problems, the utility model proposes a safe positive pressure ventilation explosion-proof PLC cabinet. Utility Model Content

[0006] 1. Technical issues to be resolved

[0007] The purpose of the utility model is to solve at least one of the technical problems existing in the prior art and to provide a safe positive pressure ventilation explosion-proof PLC cabinet, which can solve the problem that the above-mentioned existing explosion-proof cabinets cannot release pressure in time and can only adjust the pressure reducing valve after the system alarm, but cannot dynamically adjust the pressure inside the cabinet.

[0008] (II) Technical solution

[0009] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a safe positive pressure ventilation explosion-proof PLC cabinet, comprising a main cabinet, a control box is fixedly installed on the side of the main cabinet, a base plate is fixedly installed on the bottom end of the other side of the main cabinet, and an explosion-proof structure is arranged on the base plate.

[0010] The explosion-proof structure includes two buffer simple columns, both of which are fixedly installed on the bottom plate, and two buffer sleeves are fixedly installed on the side of the two buffer simple columns close to the main cabinet;

[0011] A buffer spring is fixedly installed inside the buffer sleeve, and a support block is fixedly installed at one end of the buffer spring away from the buffer sleeve. The support block is slidably connected to the buffer sleeve.

[0012] A hollow rod is fixedly installed on one end of the support block away from the buffer spring, and a supporting plate is fixedly installed on one end of the hollow rod away from the support block, and a side of the supporting plate away from the hollow rod is in contact with the side of the main cabinet;

[0013] A connecting groove is provided on the side wall of the main cabinet and the supporting plate at the position corresponding to the hollow rod, so that the hollow rod communicates with the inside of the main cabinet; a slider is slidably installed inside the hollow rod, and the slider fits tightly with the inner wall of the hollow rod, and strip holes are provided on the upper and lower sides of the hollow rod;

[0014] A pressure relief spring is fixedly installed on one side of the support block close to the hollow rod, and one end of the pressure relief spring away from the support block is fixedly connected to the sliding block.

[0015] Preferably, a filter pressure reducing valve is fixedly installed on the side of the bottom end of the inner wall of the control box away from the main cabinet, an air inlet is provided at the bottom end of the filter pressure reducing valve, a connecting joint is fixedly connected to the side of the filter pressure reducing valve close to the main cabinet through a connecting pipe, an end of the connecting joint away from the filter pressure reducing valve is fixedly connected to a regulating valve through the same connecting pipe, and an end of the regulating valve away from the connecting joint extends to the interior of the main cabinet.

[0016] Preferably, an exhaust port is provided on the upper surface of the control box, and a fireproof air cap is provided at the top of the interior of the control box. The fireproof air cap is connected to the interior of the exhaust port, and the fireproof air cap is fixedly mounted on the inner wall of the control box.

[0017] Preferably, a differential pressure gauge is fixedly mounted on the top end of the front surface of the control box, and a selection switch is fixedly mounted on the bottom end of the front surface of the control box; the selection switch is electrically connected to the filter pressure reducing valve.

[0018] Preferably, a sensor is fixedly mounted on one side of the slider close to the pressure relief spring, and the sensor is electrically connected to the regulating valve.

[0019] Preferably, door openings are provided on the front and rear surfaces of the main cabinet, and cabinet doors are rotatably installed in the two door openings via rotating shafts; door handles are fixedly installed on the opposite back surfaces of the two cabinet doors.

[0020] (III) Beneficial effects

[0021] Compared with the prior art, the beneficial effects of the utility model are:

[0022] (1) This safe positive pressure ventilation explosion-proof PLC cabinet can relieve the pressure of the cabinet by cooperating with a slide block and a hollow rod with strip-shaped through holes at both ends. When the pressure inside the cabinet is relatively low, the slide block is pushed away from the inside of the hollow rod by the pressure relief spring. At this time, the gas in the main cabinet is blocked by the slide block and no longer discharged from the strip-shaped holes at both ends of the hollow rod. As a result, the pressure inside the main cabinet is increased, thereby achieving a dynamic adjustment of the pressure inside the cabinet.

[0023] (2) The safety type positive pressure ventilation explosion-proof PLC cabinet is provided with a support plate through the outer wall of the cabinet. When the pressure inside the cabinet is too high, the support plate is deformed and plays an explosion-proof role for the main cabinet through the cooperation of the support block, buffer spring and buffer sleeve.

[0024] (3) This safe positive pressure ventilation explosion-proof PLC cabinet can detect the distance between the slider and the support block during the movement of the slider through the sensor on the slider. The farther the distance, the smaller the pressure inside the cabinet, and the closer the distance, the greater the pressure inside the cabinet. The regulating valve in the control box adjusts the valve size according to the real-time data transmitted, and further dynamically adjusts the pressure inside the cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0026] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0027] Figure 2 This is a schematic diagram of the cross-sectional structure of the control box of the utility model;

[0028] Figure 3 It is a schematic diagram of the partial cross-section structure of the utility model.

[0029] Figure numerals: 1. Main cabinet; 2. Support plate; 3. Buffer column; 4. Bottom plate; 5. Door handle; 6. Cabinet door; 7. Rotating shaft; 8. Selector switch; 9. Control box; 10. Differential pressure gauge; 11. Exhaust port; 12. Hollow rod; 13. Fireproof vent cap; 14. Connecting joint; 15. Filter pressure reducing valve; 16. Regulating valve; 17. Buffer spring; 18. Pressure relief spring; 19. Strip hole; 20. Sensor; 21. Slider; 22. Connecting groove; 23. Support block; 24. Buffer sleeve; 25. Air inlet; 26. Connecting pipe. DETAILED DESCRIPTION

[0030] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0031] See also Figure 1-3 The utility model provides a technical solution: a safe positive pressure ventilation explosion-proof PLC cabinet, comprising a main cabinet 1, a control box 9 is fixedly installed on the side of the main cabinet 1, a bottom plate 4 is fixedly installed on the bottom end of the other side of the main cabinet 1, and an explosion-proof structure is arranged on the bottom plate 4;

[0032] The explosion-proof structure includes two buffer columns 3, both of which are fixedly mounted on the bottom plate 4, and two buffer sleeves 24 are fixedly mounted on one side of the two buffer columns 3 close to the main cabinet 1;

[0033] A buffer spring 17 is fixedly installed inside the buffer sleeve 24, and a support block 23 is fixedly installed on one end of the buffer spring 17 away from the buffer sleeve 24. The support block 23 is slidably connected to the buffer sleeve 24, and a hollow rod 12 is fixedly installed on one end of the support block 23 away from the buffer spring 17. A support plate 2 is fixedly installed on one end of the hollow rod 12 away from the support block 23, and the other side of the support plate 2 is in contact with the side of the main cabinet 1;

[0034] When the pressure of the main cabinet 1 is too high, the outer wall of the main cabinet 1 is deformed, which in turn causes the supporting plate 2 fitted therewith to be deformed, which in turn causes the hollow rod 12 fixed on the supporting plate 2 to be displaced, and the supporting block 23 fixed to the hollow rod 12 moves in the buffer sleeve 24, which causes the buffer spring 17 to contract and undergo elastic deformation, thereby achieving an explosion-proof effect on the main cabinet 1 through the buffer spring 17 and the buffer column 3.

[0035] A connecting groove 22 is provided on the side wall of the main cabinet 1 and the supporting plate 2 at the position corresponding to the hollow rod 12, so that the hollow rod 12 is communicated with the interior of the main cabinet 1; a slider 21 is slidably installed inside the hollow rod 12, and the slider 21 fits tightly with the inner wall of the hollow rod 12, and strip holes 19 are provided on the upper and lower sides of the interior of the hollow rod 12.

[0036] Furthermore, a pressure relief spring 18 is fixedly installed on one side of the support block 23 close to the hollow rod 12, and one end of the pressure relief spring 18 away from the support block 23 is fixedly connected to the slider 21, and a sensor 20 is fixedly installed on one side of the slider 21 close to the pressure relief spring 18, and the sensor 20 is electrically connected to the regulating valve 16. When the pressure inside the main cabinet 1 is too high, under the action of the gas pressure inside the main cabinet 1, the slider 21 is pushed outward from the main cabinet 1, thereby causing the slider 21 to slide along the inner wall of the hollow rod 12, and at the same time pushing the pressure relief spring 18 to contract. When the slider 21 slides through the strip holes 19 opened at both ends of the hollow rod 12, the gas in the main cabinet 1 will be discharged from the strip holes 19 opened at both ends of the hollow rod 12, thereby relieving the pressure inside the main cabinet 1.

[0037] When the pressure inside the main cabinet 1 is relatively low, the pressure relief spring 18 will return to its original state, thereby causing the pressure relief spring 18 to push the slider 21 to move in the direction of the groove 22. When the slider 21 leaves the interior of 12, the gas in the main cabinet 1 is blocked by the slider 21 and is no longer discharged from the strip holes 19 at both ends of the hollow rod 12, thereby causing the pressure inside the main cabinet 1 to increase.

[0038] Furthermore, a filter pressure reducing valve 15 is fixedly installed on the side of the bottom end of the inner wall of the control box 9 away from the main cabinet 1, and an air inlet 25 is provided at the bottom end of the filter pressure reducing valve 15. The side of the filter pressure reducing valve 15 close to the main cabinet 1 is fixedly connected to a connecting joint 14 through a connecting pipe 26, and the end of the connecting joint 14 away from the filter pressure reducing valve 15 is fixedly connected to a regulating valve 16 through the same connecting pipe 26, and the end of the regulating valve 16 away from the connecting joint 14 extends to the interior of the main cabinet 1.

[0039] Furthermore, an exhaust port 11 is opened on the upper surface of the control box 9, and a fireproof ventilation cap 13 is arranged at the top position inside the control box 9. The fireproof ventilation cap 13 is connected to the inside of the exhaust port 11, and the fireproof ventilation cap 13 is fixedly installed on the inner wall of the control box 9.

[0040] Furthermore, a differential pressure gauge 10 is fixedly installed on the top of the front surface of the control box 9. The differential pressure gauge 10 is used to detect the internal pressure difference of the main cabinet 1. The differential pressure gauge 10 is a prior art and will not be described in detail here. A selection switch 8 is fixedly installed on the bottom of the front surface of the control box 9. The selection switch 8 is electrically connected to the filter pressure reducing valve 15. By adjusting the selection switch 8, the gas passes through the filter pressure reducing valve 15, the connecting joint 14, the regulating valve 16 and the connecting pipe 26 from the air inlet 25 to the interior of the main cabinet 1. At this time, the pressure inside the main cabinet 1 increases, and part of the gas is discharged from the exhaust port 11 through the fireproof ventilation cap 13, so that the interior of the main cabinet 1 is in a positive pressure ventilation state.

[0041] Furthermore, door openings are provided on the front and rear surfaces of the main cabinet 1 , and cabinet doors 6 are rotatably installed in the two door openings via rotating shafts 7 ; door handles 5 are fixedly installed on the opposite back surfaces of the two cabinet doors 6 .

[0042] Working principle: By adjusting the selection switch 8, the gas passes through the filter pressure reducing valve 15, the connecting joint 14, the regulating valve 16 and the connecting pipe 26 from the air inlet 25 to the interior of the main cabinet 1. At this time, the pressure inside the main cabinet 1 increases, and part of the gas is discharged from the exhaust port 11 through the fireproof ventilation cap 13, so that the interior of the main cabinet 1 is in a positive pressure ventilation state.

[0043] When the pressure inside the main cabinet 1 is too high, the slider 21 is pushed out of the main cabinet 1 under the action of the gas pressure inside the main cabinet 1, so that the slider 21 slides along the inner wall of the hollow rod 12, and at the same time pushes the pressure relief spring 18 to contract. When the slider 21 slides through the strip holes 19 opened at both ends of the hollow rod 12, the gas in the main cabinet 1 will be discharged from the strip holes 19 opened at both ends of the hollow rod 12, thereby relieving the pressure inside the main cabinet 1.

[0044] When the pressure inside the main cabinet 1 is relatively low, the pressure relief spring 18 will return to its original state, thereby causing the pressure relief spring 18 to push the slider 21 to move in the direction of the groove 22. When the slider 21 leaves the hollow rod 12, the gas in the main cabinet 1 is blocked by the slider 21 and is no longer discharged from the strip holes 19 at both ends of the hollow rod 12, thereby causing the pressure inside the main cabinet 1 to increase.

[0045] The sensor 20 is used to detect the data of the distance between the sensor 20 body and the support block 23, and the distance data is transmitted to the control box 9. The regulating valve 16 in the control box 9 is used to adjust the air intake into the main cabinet 1, so as to realize dynamic adjustment of the pressure in the main cabinet 1.

[0046] When the pressure of the main cabinet 1 is too high, the outer wall of the main cabinet 1 is deformed, which in turn causes the supporting plate 2 fitted therewith to be deformed, which in turn causes the hollow rod 12 fixed on the supporting plate 2 to be displaced, and the supporting block 23 fixed to the hollow rod 12 moves in the buffer sleeve 24, which causes the buffer spring 17 to contract and undergo elastic deformation, thereby achieving an explosion-proof effect on the main cabinet 1 through the buffer spring 17 and the buffer column 3.

[0047] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A safe positive pressure ventilation explosion-proof PLC cabinet, comprising a main cabinet (1); characterized in that: A control box (9) is fixedly mounted on the side of the main cabinet (1); a bottom plate (4) is fixedly mounted on the bottom end of the other side of the main cabinet (1), and an explosion-proof structure is arranged on the bottom plate (4); The explosion-proof structure comprises two buffer simple columns (3), the two buffer simple columns (3) are fixedly mounted on the bottom plate (4), and two buffer sleeves (24) are fixedly mounted on one side of the two buffer simple columns (3) close to the main cabinet (1); A buffer spring (17) is fixedly installed inside the buffer sleeve (24), and a support block (23) is fixedly installed at one end of the buffer spring (17) away from the buffer sleeve (24), and the support block (23) is slidably connected to the buffer sleeve (24); A hollow rod (12) is fixedly mounted on one end of the support block (23) away from the buffer spring (17), and a support plate (2) is fixedly mounted on one end of the hollow rod (12) away from the support block (23), and the other side of the support plate (2) is in contact with the side surface of the main cabinet (1); A connecting groove (22) is provided on the side wall of the main cabinet (1) and the supporting plate (2) at a position corresponding to the hollow rod (12), so that the hollow rod (12) and the interior of the main cabinet (1) are communicated. A slider (21) is slidably installed inside the hollow rod (12), and the slider (21) is tightly fitted with the inner wall of the hollow rod (12). Strip holes (19) are provided on both upper and lower sides of the interior of the hollow rod (12). A pressure relief spring (18) is fixedly mounted on one side of the support block (23) close to the hollow rod (12), and one end of the pressure relief spring (18) away from the support block (23) is fixedly connected to the slider (21).

2. A safe positive pressure ventilation explosion-proof PLC cabinet according to claim 1, characterized in that: A filter pressure reducing valve (15) is fixedly mounted on a side of the inner wall bottom end of the control box (9) away from the main cabinet (1); an air inlet (25) is arranged at the bottom end of the filter pressure reducing valve (15); a side of the filter pressure reducing valve (15) close to the main cabinet (1) is fixedly connected to a connecting joint (14) via a connecting pipe (26); an end of the connecting joint (14) away from the filter pressure reducing valve (15) is fixedly connected to a regulating valve (16) via the same connecting pipe (26); and an end of the regulating valve (16) away from the connecting joint (14) extends to the interior of the main cabinet (1).

3. A safe positive pressure ventilation explosion-proof PLC cabinet according to claim 1, characterized in that: The upper surface of the control box (9) is provided with an exhaust port (11), and a fireproof air vent cap (13) is arranged at the top end of the control box (9). The fireproof air vent cap (13) is connected to the inside of the exhaust port (11), and the fireproof air vent cap (13) is fixedly mounted on the inner wall of the control box (9).

4. A safe positive pressure ventilation explosion-proof PLC cabinet according to claim 1, characterized in that: A differential pressure gauge (10) is fixedly mounted on the top end of the front surface of the control box (9), and a selection switch (8) is fixedly mounted on the bottom end of the front surface of the control box (9); the selection switch (8) is electrically connected to the filter pressure reducing valve (15).

5. A safe positive pressure ventilation explosion-proof PLC cabinet according to claim 1, characterized in that: A sensor (20) is fixedly mounted on one side of the slider (21) close to the pressure relief spring (18), and the sensor (20) is electrically connected to the regulating valve (16).

6. A safe positive pressure ventilation explosion-proof PLC cabinet according to claim 1, characterized in that: The front and rear surfaces of the main cabinet (1) are both provided with door openings, and cabinet doors (6) are rotatably installed in the two door openings via rotating shafts (7); door handles (5) are fixedly installed on the opposite back surfaces of the two cabinet doors (6).

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