Cable incoming and outgoing line liquid sealing device and electric cabinet

Abstract

The utility model discloses a cable incoming and outgoing line liquid seal device and an electric cabinet, comprising a box body provided with a cable connector for cable incoming and outgoing; the middle part of the cable liquid seal joint is recessed inwards to form a liquid level difference area, and sealing liquid is arranged in the liquid level difference area; one end of the cable liquid seal joint is in sealed connection with the cable connector, and the other end of the cable liquid seal joint is communicated with the outside; and the cable in the box body can extend to the outside through the cable liquid seal joint. According to the utility model, the sealing liquid in the liquid level difference area in the cable liquid sealing joint is used for preventing external flammable and explosive gas from entering the box body, and potential safety hazards such as combustion, explosion and the like of the electric control box and the surrounding environment are prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical equipment, in particular to a cable inlet and outlet liquid sealing device and an electric control box. Background Art

[0002] The electronic control box is the control center of motors and other equipment, responsible for sending instructions to motors and other equipment and receiving feedback; motors and other equipment require electronic control boxes to control their operation, such as starting, stopping, speed adjustment, etc.

[0003] When motors and other equipment are used in environments containing flammable and explosive gases such as mines, external cables will pass through the cable connection port of the electric control box and then be electrically connected to the components in the electric control box to provide electrical energy to the components in the electric control box.

[0004] If the components in the electric control box are damaged or aged, the surface charge of the components in the electric control box will be unevenly distributed, leading to a dangerous situation of partial discharge. Local discharge is prone to produce electric sparks. If there are flammable or explosive gases in the electric control box, it will cause safety hazards such as combustion and explosion in the entire electric control box and the surrounding environment.

[0005] At present, the cable is directly passed through the cable connection port of the electric control box, and then the gap between the cable connection port and the cable is blocked with sealing materials to complete the sealing, so as to prevent the flammable and explosive gases from the outside from entering the electric control box through the gap between the cable connection port and the cable. However, when the sealing materials are exposed in an environment containing flammable and explosive gases such as a mine, the damage or aging speed is accelerated, resulting in the reduction of the sealing performance of the sealing materials, or even failure, thereby allowing the flammable and explosive gases in dangerous gas environments such as mines to enter the electric control box. Utility Model Content

[0006] In view of this, the utility model provides a cable inlet and outlet liquid sealing device and an electric control box, which are used to solve the problem in the prior art that the sealing material between the cable connection port and the gap between the cable is damaged or aged faster, resulting in flammable and explosive gases in dangerous gas environments such as mines entering the electric control box.

[0007] In order to achieve one or part or all of the above purposes or other purposes, the technical solution of the utility model is a cable inlet and outlet liquid sealing device, including:

[0008] A box body, wherein the box body is provided with a cable connection port for cables to enter and exit;

[0009] A cable liquid-sealed joint, wherein the middle portion of the cable liquid-sealed joint is recessed inward to form a liquid level difference area, and a sealing liquid is provided in the liquid level difference area; one end of the cable liquid-sealed joint is sealed and connected to the cable connection port, and the other end of the cable liquid-sealed joint is in communication with the outside;

[0010] The cables in the box can be extended to the outside through the cable liquid-sealed joint.

[0011] Furthermore, a liquid replenishing device is provided on a side of the liquid level difference area close to the box body, and the liquid replenishing device is used to release sealing liquid to the liquid level difference area.

[0012] Furthermore, the cable liquid-sealed joint is also provided with a first liquid level sensor, and the first liquid level sensor is located on a side of the liquid level difference area close to the box body.

[0013] Furthermore, the liquid sealing device is further provided with a second liquid level sensor, and the second liquid level sensor is located on the other side of the liquid level difference area away from the box body;

[0014] The first liquid level sensor and the second liquid level sensor are located at different heights, and the height of the first liquid level sensor is lower than the height of the second liquid level sensor.

[0015] Furthermore, a limit switch sensor is provided in the box body, and the limit switch sensor is used to detect whether the door of the electric control box is closed.

[0016] Furthermore, an inert gas filling device is provided in the box body, and the inert gas filling device is used to release inert gas into the box body.

[0017] Furthermore, a first pressure sensor is provided above a side of the liquid level difference region close to the box body, and a second pressure sensor is provided above another side of the liquid level difference region away from the box body.

[0018] Furthermore, a drainage device is provided at the bottom of the liquid level difference area, and the drainage device is used to discharge the sealing liquid in the liquid level difference area.

[0019] Furthermore, the shape of the cable liquid-sealed joint is any one of a U-shaped tube, a V-shaped tube, a W-shaped tube and an inverted "Ω"-shaped tube.

[0020] The utility model also provides an electric control box, comprising the cable inlet and outlet liquid sealing device mentioned above.

[0021] Compared with the prior art, the utility model has at least the following beneficial effects:

[0022] The utility model blocks the external flammable and explosive gases from entering the box body through the sealing liquid in the liquid level difference area of ​​the cable liquid seal joint, thereby preventing the electric control box and the surrounding environment from the potential safety hazards of combustion and explosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present invention; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present invention or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order.

[0024] 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.

[0025] Figure 1 It is a structural schematic diagram of the electric control box of the utility model;

[0026] Figure 2 It is one of the control strategies of the electric control box of the utility model;

[0027] Figure 3 This is another control strategy for the electric control box of the utility model.

[0028] Reference numerals:

[0029] 10. Box body;

[0030] 11. Inert gas charging device;

[0031] 12. Limit switch sensor;

[0032] 20. Cable liquid seal joint;

[0033] 21. Liquid level difference area;

[0034] 22. Liquid replenishing device;

[0035] 23. A first liquid level sensor;

[0036] 24. Second liquid level sensor;

[0037] 25. A first pressure sensor;

[0038] 26. A second pressure sensor;

[0039] 27. Drainage device;

[0040] 30. Control center. DETAILED DESCRIPTION

[0041] In order to make the technical problems, technical solutions and beneficial effects to be solved by the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model. Thus, a feature indicated in this specification will be used to illustrate one of the features of an embodiment of the utility model, rather than implying that each embodiment of the utility model must have the described features. In addition, it should be noted that this specification describes many features. Although certain features can be combined together to illustrate possible system designs, these features can also be used in other combinations that are not explicitly described. Thus, unless otherwise stated, the described combinations are not intended to be limiting.

[0042] The principle and structure of the present utility model are described in detail below with reference to the accompanying drawings and embodiments.

[0043] Example 1

[0044] See attached Figure 1 The utility model provides a cable inlet and outlet liquid sealing device, comprising:

[0045] The box body 10 is provided with a cable connection port (not shown, the same applies to the whole text) for the entry and exit of cables.

[0046] A cable liquid-sealed joint 20, wherein the middle portion of the cable liquid-sealed joint 20 is recessed inward to form a liquid level difference area 21, wherein a sealing liquid is provided in the liquid level difference area 21; one end of the cable liquid-sealed joint 20 is sealedly connected to the cable connection port, and the other end of the cable liquid-sealed joint 20 is communicated with the outside; wherein the sealed connection is preferably welding.

[0047] The cables in the box 10 can extend to the outside through the cable liquid-sealed joint 20 .

[0048] The cable inlet and outlet liquid sealing device further includes a control center 30; the cable liquid sealing joint 20 is preferably a U-shaped tube, one end of which is preferably an inlet and the other end is preferably an outlet. The outlet of the cable liquid sealing joint 20 is welded to the cable connection port of the box 10, and the cables in the box 10 pass through the cable connection port, the inlet of the cable liquid sealing joint 20 and the outlet of the cable liquid sealing joint 20 in sequence, and then extend to the outside to connect to the power supply, so as to provide power to the components in the box 10 and transmit signals. Furthermore, there are multiple cables passing through the outlet of the cable liquid-sealed joint 20, and the multiple cables are twisted into one cable and then passed through the outlet of the cable liquid-sealed joint 20. At this time, the size of the twisted cable matches the size of the outlet of the cable liquid-sealed joint 20, so that small insects such as mosquitoes cannot enter the interior of the cable liquid-sealed joint 20 from the outlet of the cable liquid-sealed joint 20. However, there is no sealing effect in the section from the outlet of the cable liquid-sealed joint 20 to the liquid level difference area 21, and the outside air can enter the section from the inlet of the cable liquid-sealed joint 20 to the liquid level difference area 21, so that the first pressure A in the section from the outlet of the cable liquid-sealed joint 20 to the liquid level difference area 21 is consistent with the outside pressure. And the second pressure B in the section from the inlet of the cable liquid-sealed joint 20 to the liquid level difference area 21 is consistent with the pressure in the box 10.

[0049] Therefore, when the cable in the box body 10 extends to the outside through the liquid level difference area 21 in the cable liquid seal joint 20, the flammable and explosive gases in the outside will be blocked by the sealing liquid in the liquid level difference area 21, and it is difficult for them to enter the box body 10 through the cable liquid seal joint 20. Therefore, even if the components in the electric control box are damaged or aged, resulting in uneven surface charge distribution of the components in the electric control box, which makes it easy to generate electric sparks, it is difficult for the entire electric control box and the surrounding environment to have safety hazards such as combustion and explosion.

[0050] In order to prevent the sealing liquid in the liquid level difference area 21 close to the box body 10 from being less, thereby reducing the sealing effect of the cable liquid sealing joint 20, refer to the attached Figure 1 The inner wall of the cable liquid seal joint 20 is also provided with a first liquid level sensor 23, and the first liquid level sensor 23 is located on the side of the liquid level difference area 21 close to the box body 10, and the first liquid level sensor 23 is electrically connected to the control center 30.

[0051] In this way, when the control center 30 can receive the liquid level information sent by the first liquid level sensor 23, it ensures that the height of the sealing liquid in the liquid level difference area 21 close to the side of the box body 10 reaches or exceeds the height of the first liquid level sensor 23, so as to ensure the sealing effect of the cable liquid seal joint 20 and prevent external flammable and explosive gases from entering the electrical control box through the cable liquid seal joint 20.

[0052] The sealing liquid on the side of the liquid level difference area 21 close to the box body 10 is equivalent to the sealing liquid on the side of the liquid level difference area 21 close to the inlet of the cable liquid sealing joint 20, and the same shall apply throughout.

[0053] Among them, refer to the attached Figure 1 The outer wall of the cable liquid sealing joint 20 is also provided with a liquid replenishing device 22, the liquid inlet of the liquid replenishing device 22 passes through the outer wall of the cable liquid sealing joint 20, and then the gap between the liquid inlet of the liquid replenishing device 22 and the outer wall of the cable liquid sealing joint 20 is welded to prevent air leakage; and the liquid replenishing device 22 is also located on the side of the liquid level difference area 21 close to the box body 10 and above the first liquid level sensor 23, the liquid replenishing device 22 is electrically connected to the control center 30, and the liquid replenishing device 22 is used to release the sealing liquid to maintain the liquid level difference in the liquid level difference area 21.

[0054] In this way, when the control center 30 does not receive the liquid level information sent by the first liquid level sensor 23, the control center 30 will start the liquid replenishing device 22 to make the liquid replenishing device 22 release the sealing liquid to the liquid level difference area 21. The control center 30 will not close the liquid replenishing device 22 until it receives the liquid level information sent by the first liquid level sensor 23, so as to ensure the sealing effect of the cable liquid seal joint 20 and prevent external flammable and explosive gases from entering the electrical control box through the cable liquid seal joint 20.

[0055] Among them, refer to the attached Figure 1 A limit switch sensor 12 is also provided in the box body 10. The limit switch sensor 12 is electrically connected to the control center 30. The limit switch sensor 12 is used to detect whether the door of the electric control box is closed.

[0056] In this way, if the control center 30 does not receive the alarm information sent by the limit switch sensor 12, it means that the limit switch sensor 12 is closed, that is, the door of the electric control box is closed, which indicates that the electric control box is in a sealed state at this time; if the control center 30 receives the alarm information sent by the limit switch sensor 12, it means that the limit switch sensor 12 is not closed, that is, the door of the electric control box is not closed, and the electric control box is not in a sealed state. At this time, maintenance personnel are required to come forward to check and repair. The maintenance personnel will stop repairing until the control center 30 does not receive the alarm information sent by the limit switch sensor 12.

[0057] Among them, refer to the attached Figure 1 An inert gas filling device 11 is provided in the box body, and the inert gas filling device 11 is electrically connected to the control center 30 , and the inert gas filling device 11 is used to release inert gas into the box body 10 .

[0058] When the door of the electric control box is closed, the control center 30 will start the inert gas filling device 11, so that the inert gas filling device 11 releases inert gas into the box 10 for 30 seconds, ensuring that the box 10 is filled with inert gas and the air pressure in the box 10 is maintained at a rated value. If the control center 30 detects that the air pressure in the box 10 is not within the rated value range, it is determined that the box 10 has a leak, and the control center 30 will start the alarm device in the box 10, and also send a warning message to the background to remind the background supervisor or maintenance personnel that the box 10 has a leak so that they can perform repairs in time.

[0059] In order to timely understand whether the box 10 has leaked, refer to the attached Figure 1 A first pressure sensor 25 is provided above the side of the liquid level difference area 21 close to the box body 10 , and a second pressure sensor 26 is provided above the other side of the liquid level difference area 21 away from the box body 10 .

[0060] When the cable liquid seal joint 20 and the box 10 are properly connected, the electric control box is powered on and started. The control center 30 first collects the first pressure A1 before the inert gas filling device 11 is not started through the first pressure sensor 25, and the second pressure sensor 26 collects the second pressure B1 before the inert gas filling device 11 is not started. Then the control center 30 starts the inert gas filling device 11, so that the inert gas filling device 11 releases inert gas into the box 10 for 30 seconds (the inert gas will not affect the normal operation of the components in the box 10). After 30 seconds, the control center 30 collects the first pressure A2 and the second pressure B2 after the inert gas filling device 11 is started. Under normal circumstances, the first pressure A2 must be greater than the second pressure B2, and the first calculation model is:

[0061] A2=A1+K1+B2-B1;

[0062] Among them, K1 is the rated air pressure value when the control center 30 starts the inert gas inflation device 11 to release the inert gas into the box body 10, that is, under ideal conditions, K1 is equal to the pressure difference value of the first pressure A2 minus the first pressure A1 when there is no leakage in the box body 10; and because the second pressure B1 and the second pressure B2 are closely related to the air pressure of the environment in which the electric control box is located, therefore, under ideal conditions, the pressure values ​​of the second pressure B1 and the second pressure B2 should be the same, but in actual applications, the pressure values ​​of the second pressure B1 and the second pressure B2 are not always the same, as long as the absolute value of the pressure difference between the second pressure B1 and the second pressure B2 is between 0-1HPa, that is, the value of A1+K1+B2-B1 is between A2±1HPa, then the equation of the first calculation model can also be established.

[0063] At this time, the control center 30 determines whether the equation of the first calculation model is established.

[0064] If the equation of the first calculation model is established, the control center 30 determines that there is no air leakage in the box body 10, the sealing effect of the box body 10 is good, and the electric control box operates normally.

[0065] If the equation of the first calculation model is not established, the control center 30 determines that there is a gas leak in the box 10, and the control center 30 activates the alarm device in the box 10, and also sends a warning message to the background to remind the background supervisor or maintenance personnel that there is a gas leak in the box 10 so as to perform repairs in time.

[0066] In this way, if the components in the electric control box are damaged or aged, the components in the electric control box may have uneven surface charge distribution, leading to a dangerous situation of local discharge, and local discharge is prone to produce electric sparks. At this time, preventing flammable and explosive gases in dangerous gas environments such as mines from entering the box body 10 can prevent safety hazards such as combustion and explosion in the electric control box and the surrounding environment.

[0067] In other embodiments, when the control center 30 does not receive the alarm information sent by the limit switch sensor 12, in order to further ensure the liquid level difference of the sealing liquid in the liquid level difference area 21 and further ensure the good sealing effect of the box body 10, refer to the attached Figure 1 , a second liquid level sensor 24 is also provided on the inner side wall of the liquid sealing device, and the second liquid level sensor 24 is located on the other side of the liquid level difference area 21 away from the box body 10, and the second liquid level sensor 24 is electrically connected to the control center 30; and the first liquid level sensor 23 and the second liquid level sensor 24 are at different heights. Because the pressure above the first liquid level sensor 23 will be greater than the pressure above the second liquid level sensor 24, the height of the sealed liquid on the side of the liquid level difference area 21 close to the box body 10 will be lower than the height of the sealed liquid on the other side of the liquid level difference area 21 away from the box body 10, that is, the height of the first liquid level sensor 23 will also be lower than the height of the second liquid level sensor 24, so as to form the liquid level difference area 21.

[0068] In this way, when the control center 30 does not receive the liquid level information sent by the second liquid level sensor 24, the control center 30 will start the liquid replenishing device 22 again, so that the liquid replenishing device 22 releases the sealing liquid to the liquid level difference area 21, until the control center 30 can receive the liquid level information sent by the second liquid level sensor 24. The control center 30 will then close the liquid replenishing device 22 to further ensure the sealing effect of the cable liquid seal joint 20 and prevent external flammable and explosive gases from entering the electrical control box through the liquid level difference area 21.

[0069] Then the control center 30 collects the first pressure A3 before restarting the inert gas charging device 11 through the first pressure sensor 25, and collects the second pressure B3 before restarting the inert gas charging device 11 through the second pressure sensor 26. After the collection, the inert gas charging device 11 is restarted to release the inert gas into the box body 10 for 30 seconds. After 30 seconds, the control center 30 collects the first pressure A4 and the second pressure B4 after restarting the inert gas charging device 11. Under normal circumstances, the first pressure A4 must be greater than the second pressure B4, and the second calculation model is:

[0070] A4=A3+K2+B4-B3;

[0071] Among them, K2 is the rated air pressure value when the control center 30 starts the inert gas inflation device 11 again to release the inert gas into the box body 10, that is, under ideal conditions, K2 is equal to the pressure difference value of the first pressure A4 minus the first pressure A3 when there is no leakage in the box body 10; and because the second pressure B3 and the second pressure B4 are closely related to the air pressure of the environment in which the electric control box is located, therefore, under ideal conditions, the pressure values ​​of the second pressure B3 and the second pressure B4 should be the same; but in actual applications, the pressure values ​​of the second pressure B3 and the second pressure B4 are not always the same, as long as the absolute value of the pressure difference between the second pressure B3 and the second pressure B4 is between 0-1HPa, that is, the value of A3+K2+B4-B3 is between A4±1HPa, then the equation of the second calculation model can also be established.

[0072] At this time, the control center 30 determines whether the equation of the second calculation model is established.

[0073] If the equation of the second calculation model is established, the control center 30 determines that there is no air leakage in the box body 10, the sealing effect of the box body 10 is good, and the electric control box operates normally.

[0074] If the equation of the second calculation model is not established, the control center 30 determines that there is a gas leak in the box 10, and the control center 30 activates the alarm device in the box 10, and also sends a warning message to the background to remind the background supervisor or maintenance personnel that there is a gas leak in the box 10 so as to perform repairs in time.

[0075] In this way, if the components in the electric control box are damaged or aged, the components in the electric control box may have uneven surface charge distribution, leading to a dangerous situation of local discharge, and local discharge is prone to produce electric sparks. At this time, preventing flammable and explosive gases in dangerous gas environments such as mines from entering the box body 10 can prevent safety hazards such as combustion and explosion in the electric control box and the surrounding environment.

[0076] In order to facilitate the inspection and maintenance of the cables passing through the cable liquid seal joint 20, please refer to the attached Figure 1The outer wall of the bottom of the cable liquid-sealed joint 20 is also provided with a drain device 27, the liquid outlet of the drain device 27 passes through the bottom of the cable liquid-sealed joint 20 (the bottom of the cable liquid-sealed joint 20 is equivalent to the bottom of the liquid level difference area 21, the same throughout the text), and then the gap between the liquid outlet of the drain device 27 and the bottom of the cable liquid-sealed joint 20 is welded to prevent leakage; and the drain device 27 is electrically connected to the control center 30, and the drain device 27 is used to discharge the sealing liquid in the liquid level difference area 21.

[0077] In this way, when the cable passing through the cable liquid sealing joint 20 needs to be inspected and maintained, the drain device 27 is started through the control center 30, and the drain device 27 will discharge the sealing liquid in the liquid level difference area 21 out of the cable liquid sealing joint 20, so as to prevent unnecessary contact between the maintenance tools or equipment and the sealing liquid, which may cause safety risks, such as chemical corrosion, electric shock and other safety risks. Therefore, emptying the sealing liquid can ensure the safety of the inspection and maintenance process; and the maintenance tools or equipment do not come into contact with the sealing liquid, which can prevent the maintenance tools or equipment from coming into contact with the sealing liquid, which may cause damage to the maintenance tools or equipment or performance degradation.

[0078] In order to maintain the liquid level difference area 21 in the cable liquid sealing joint 20, the shape of the cable liquid sealing joint 20 is preferably any one of a U-shaped tube, a V-shaped tube, a W-shaped tube and an inverted "Ω"-shaped tube.

[0079] Of course, the shape of the cable liquid sealing joint 20 in this embodiment is preferably an inverted “Ω”-shaped tube, which facilitates the cable to pass through the cable liquid sealing joint 20 and facilitates welding between the cable liquid sealing joint 20 and the box body 10.

[0080] In order to make the sealing liquid have excellent anti-oxidation, wear resistance, non-conductivity and other properties, the sealing liquid in the liquid level difference area 21 is preferably silicone sealing oil or polyimide sealing oil. Of course, the sealing liquid can also be selected as polyurethane sealing oil, fluororubber sealing oil or other sealing liquids with excellent anti-oxidation, wear resistance, non-conductivity and other properties, which are not limited here.

[0081] Example 2

[0082] The utility model also provides an electric control box, comprising the cable inlet and outlet liquid sealing device mentioned above.

[0083] The electric control box proposed by the utility model is used in environments containing flammable and explosive gases such as mines.

[0084] See attached Figure 2 , one of the control strategies of the electric control box proposed by the utility model is:

[0085] When the cable liquid-sealed joint 20 is correctly connected to the box body 10 of the electric control box, and the cable passes through the cable liquid-sealed joint 20 and is correctly connected to the box body 10 of the electric control box, the electric control box is powered on and started.

[0086] First, it is determined whether the control center 30 receives the liquid level information sent by the first liquid level sensor 23 .

[0087] If the control center 30 receives the liquid level information from the first liquid level sensor 23 , it indicates that the liquid height of the liquid level difference area 21 close to the side of the box body 10 has reached or exceeded the height of the first liquid level sensor 23 , and the electric control box can proceed to the next step of detection.

[0088] If the control center 30 does not receive the liquid level information sent by the first liquid level sensor 23, it means that the liquid height on the side of the liquid level difference area 21 close to the box body 10 has not reached the height of the first liquid level sensor 23. At this time, the control center 30 will start the liquid replenishing device 22 to make the liquid replenishing device 22 release the sealed liquid to the liquid level difference area 21. The control center 30 will not close the liquid replenishing device 22 until the control center 30 can receive the liquid level information sent by the first liquid level sensor 23; and during the startup of the liquid replenishing device 22, the control center 30 will poll to detect whether the liquid level has reached the specified liquid level, that is, whether the control center 30 can receive the liquid level information sent by the first liquid level sensor 23.

[0089] Second, after the control center 30 receives the liquid level information sent by the first liquid level sensor 23 , it is determined whether the control center 30 receives the alarm information sent by the limit switch sensor 12 .

[0090] If the control center 30 does not receive the alarm information sent by the limit switch sensor 12, it means that the door of the electric control box has been closed tightly, the electric control box is in a sealed state, and the electric control box can proceed to the next step of detection.

[0091] If the control center 30 receives the alarm information from the limit switch sensor 12, it means that the door of the electric control box is not closed tightly and the electric control box is not in a sealed state. At this time, maintenance personnel are required to check and repair it. During the maintenance process, the control center 30 will poll to detect whether the door of the electric control box is closed tightly, that is, whether the control center 30 receives the alarm information from the limit switch sensor 12.

[0092] Third, based on the fact that the control center 30 has not received the alarm information from the limit switch sensor 12, the control center 30 will first collect the first pressure A1 (detected by the first pressure sensor 25) and the second pressure B1 (detected by the second pressure sensor 26) before the inert gas charging device 11 is started, and then the control center 30 starts the inert gas charging device 11, and the inert gas charging device 11 continuously releases the inert gas into the box body 10 of the electric control box for 30 seconds. After 30 seconds, the control center 30 collects the first pressure A2 (still detected by the first pressure sensor 25) and the second pressure B2 (still detected by the second pressure sensor 26) after the inert gas charging device 11 is started, and then according to the first calculation model:

[0093] A2=A1+K1+B2-B1;

[0094] The control center 30 determines whether the equation of the first calculation model is established.

[0095] If the equation of the first calculation model is established, the control center 30 determines that there is no air leakage in the box body 10, the sealing effect of the box body 10 is good, and the electric control box operates normally.

[0096] If the equation of the first calculation model is not true, the control center 30 determines that there is a gas leak in the box 10, and the control center 30 activates the alarm device in the box 10. At the same time, it also sends a warning message to the background to remind the background supervisor or maintenance personnel that there is a gas leak in the box 10, so as to carry out repairs in time to prevent flammable and explosive gases in dangerous gas environments such as mines from entering the electric control box, thereby preventing safety hazards such as combustion and explosion from occurring in the electric control box and the surrounding environment.

[0097] Because if the components in the electric control box are damaged or aged, the surface charge of the components in the electric control box will be unevenly distributed, leading to the dangerous situation of local discharge, and local discharge is prone to produce electric sparks. If there are flammable and explosive gases in the electric control box at this time, it will cause safety hazards such as combustion and explosion in the entire electric control box and the surrounding environment.

[0098] Fourthly, when the electric control box needs to be inspected and maintained, the control center 30 will start the drain device 27 to drain all the sealing liquid in the cable liquid seal joint 20 .

[0099] See attached Figure 3 , another control strategy of the electric control box proposed by the utility model is:

[0100] When the cable liquid-sealed joint 20 is correctly connected to the box body 10 of the electric control box, and the cable passes through the cable liquid-sealed joint 20 and is correctly connected to the box body 10 of the electric control box, the electric control box is powered on and started.

[0101] First, it is determined whether the control center 30 receives the liquid level information sent by the first liquid level sensor 23 .

[0102] If the control center 30 receives the liquid level information from the first liquid level sensor 23 , it indicates that the liquid height of the liquid level difference area 21 close to the side of the box body 10 has reached or exceeded the height of the first liquid level sensor 23 , and the electric control box can proceed to the next step of detection.

[0103] If the control center 30 does not receive the liquid level information sent by the first liquid level sensor 23, it means that the liquid height on the side of the liquid level difference area 21 close to the box body 10 has not reached the height of the first liquid level sensor 23. At this time, the control center 30 will start the liquid replenishing device 22 to make the liquid replenishing device 22 release the sealed liquid to the liquid level difference area 21. The control center 30 will not close the liquid replenishing device 22 until the control center 30 can receive the liquid level information sent by the first liquid level sensor 23; and during the startup of the liquid replenishing device 22, the control center 30 will poll to detect whether the liquid level has reached the specified liquid level, that is, whether the control center 30 can receive the liquid level information sent by the first liquid level sensor 23.

[0104] Third, after the control center 30 receives the liquid level information sent by the first liquid level sensor 23 , it is determined whether the control center 30 receives the alarm information sent by the limit switch sensor 12 .

[0105] If the control center 30 does not receive the alarm information sent by the limit switch sensor 12, it means that the door of the electric control box has been closed tightly, the electric control box is in a sealed state, and the electric control box can proceed to the next step of detection.

[0106] If the control center 30 receives the alarm information from the limit switch sensor 12, it means that the door of the electric control box is not closed tightly and the electric control box is not in a sealed state. At this time, maintenance personnel are required to check and repair it. During the maintenance process, the control center 30 will poll to detect whether the door of the electric control box is closed tightly, that is, whether the control center 30 receives the alarm information from the limit switch sensor 12.

[0107] Third, based on the fact that the control center 30 has not received the alarm information from the limit switch sensor 12, the control center 30 will first collect the first pressure A1 (detected by the first pressure sensor 25) and the second pressure B1 (detected by the second pressure sensor 26) before the inert gas charging device 11 is started, and then the control center 30 starts the inert gas charging device 11, and the inert gas charging device 11 continuously releases the inert gas into the box body 10 of the electric control box for 30 seconds. After 30 seconds, the control center 30 collects the first pressure A2 (still detected by the first pressure sensor 25) and the second pressure B2 (still detected by the second pressure sensor 26) after the inert gas charging device 11 is started, and then according to the first calculation model:

[0108] A2=A1+K1+B2-B1;

[0109] The control center 30 determines whether the equation of the first calculation model is established.

[0110] If the equation of the first calculation model is established, the control center 30 determines that there is no air leakage in the box body 10, the sealing effect of the box body 10 is good, and the electric control box operates normally.

[0111] If the equation of the first calculation model does not hold, the next step of detection is performed.

[0112] Fourth, when the equation based on the first calculation model does not hold, it is determined whether the control center 30 receives the liquid level information sent by the second liquid level sensor 24 .

[0113] If the control center 30 receives the liquid level information from the second liquid level sensor 24, it indicates that the liquid height of the liquid level difference area 21 on the other side away from the box body 10 has reached or exceeded the height of the second liquid level sensor 24, and the electric control box can proceed to the next step of detection.

[0114] If the control center 30 does not receive the liquid level information sent by the second liquid level sensor 24, it means that the liquid height on the other side of the liquid level difference area 21 away from the box body 10 has not reached the height of the second liquid level sensor 24. At this time, the control center 30 will start the liquid replenishing device 22 again to make the liquid replenishing device 22 release the sealed liquid to the liquid level difference area 21. The control center 30 will not close the liquid replenishing device 22 until the control center 30 can receive the liquid level information sent by the second liquid level sensor 24. During the startup of the liquid replenishing device 22, the control center 30 will poll to detect whether the liquid level has reached the specified liquid level, that is, whether the control center 30 can receive the liquid level information sent by the second liquid level sensor 24.

[0115] Fifth, after the control center 30 receives the liquid level information sent by the second liquid level sensor 24, the control center 30 will first collect the first pressure A3 (detected by the first pressure sensor 25) and the second pressure B3 (detected by the second pressure sensor 26) before restarting the inert gas charging device 11, and then the control center 30 restarts the inert gas charging device 11, and the inert gas charging device 11 continuously releases the inert gas into the box body 10 of the electric control box again for 30 seconds. After 30 seconds, the control center 30 collects the first pressure A4 (still detected by the first pressure sensor 25) and the second pressure B4 (still detected by the second pressure sensor 26) after restarting the inert gas charging device 11, and then according to the second calculation model:

[0116] A4=A3+K2+B4-B3;

[0117] The control center 30 then determines whether the equation of the second calculation model is established.

[0118] If the equation of the second calculation model is established, the control center 30 determines that there is no air leakage in the box body 10, the sealing effect of the box body 10 is good, and the electric control box operates normally.

[0119] If the equation of the second calculation model is not true, the control center 30 determines that there is a gas leak in the box 10, and the control center 30 activates the alarm device in the box 10. At the same time, it also sends a warning message to the background to remind the background supervisor or maintenance personnel that there is a gas leak in the box 10, so as to carry out repairs in time to prevent flammable and explosive gases in dangerous gas environments such as mines from entering the electric control box, thereby preventing safety hazards such as combustion and explosion from occurring in the electric control box and the surrounding environment.

[0120] Because if the components in the electric control box are damaged or aged, the surface charge of the components in the electric control box will be unevenly distributed, leading to the dangerous situation of local discharge, and local discharge is prone to produce electric sparks. If there are flammable and explosive gases in the electric control box at this time, it will cause safety hazards such as combustion and explosion in the entire electric control box and the surrounding environment.

[0121] Sixth, when the electric control box needs to be inspected and maintained, the control center 30 will start the drain device 27 to drain all the sealing liquid in the cable liquid seal joint 20.

[0122] Obviously, the embodiments described above are only some embodiments of the utility model, rather than all embodiments. The preferred embodiments of the utility model are given in the accompanying drawings, but they do not limit the patent scope of the utility model. The utility model can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive. Although the utility model is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to replace some of the technical features therein with equivalents. Any equivalent structure made using the contents of the utility model specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the utility model.

Claims

1. A cable inlet and outlet liquid sealing device, characterized in that: include: A box body (10), wherein the box body (10) is provided with a cable connection port for the entry and exit of cables; A cable liquid-sealed joint (20), wherein the middle portion of the cable liquid-sealed joint (20) is recessed inwardly to form a liquid level difference region (21), and a sealing liquid is provided in the liquid level difference region (21); one end of the cable liquid-sealed joint (20) is sealedly connected to the cable connection port, and the other end of the cable liquid-sealed joint (20) is in communication with the outside; The cables in the box (10) can be extended to the outside through the cable liquid-sealed joint (20).

2. The cable inlet and outlet liquid sealing device according to claim 1, characterized in that: A liquid replenishing device (22) is also provided on a side of the liquid level difference area (21) close to the box body (10), and the liquid replenishing device (22) is used to release sealing liquid to the liquid level difference area (21).

3. The cable inlet and outlet liquid sealing device according to claim 1, characterized in that: The cable liquid-sealed joint (20) is further provided with a first liquid level sensor (23), and the first liquid level sensor (23) is located on a side of the liquid level difference area (21) close to the box body (10).

4. The cable inlet and outlet liquid sealing device according to claim 3, characterized in that: The liquid sealing device is further provided with a second liquid level sensor (24), the second liquid level sensor (24) being located on the other side of the liquid level difference area (21) away from the box body (10); The first liquid level sensor (23) and the second liquid level sensor (24) are located at different heights, and the height of the first liquid level sensor (23) is lower than the height of the second liquid level sensor (24).

5. The cable inlet and outlet liquid sealing device according to claim 1, characterized in that: A limit switch sensor (12) is also provided in the box body (10), and the limit switch sensor (12) is used to detect whether the box door of the electric control box is closed.

6. The cable inlet and outlet liquid sealing device according to claim 1, characterized in that: An inert gas filling device (11) is provided in the box body, and the inert gas filling device (11) is used to release inert gas into the box body (10).

7. The cable inlet and outlet liquid sealing device according to claim 1, characterized in that: A first pressure sensor (25) is provided above a side of the liquid level difference region (21) close to the box body (10), and a second pressure sensor (26) is provided above another side of the liquid level difference region (21) away from the box body (10).

8. The cable inlet and outlet liquid sealing device according to claim 1, characterized in that: A liquid discharge device (27) is provided at the bottom of the liquid level difference area (21), and the liquid discharge device (27) is used to discharge the sealing liquid in the liquid level difference area (21).

9. The cable inlet and outlet liquid sealing device according to claim 1, characterized in that: The cable liquid-sealed joint (20) is in the shape of any one of a U-shaped tube, a V-shaped tube, a W-shaped tube and an inverted "Ω"-shaped tube.

10. An electric control box, characterized in that: The invention comprises the cable inlet and outlet liquid sealing device as described in any one of claims 1 to 9.

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