An explosion-proof control box

Abstract

The utility model discloses a solve the problem that the existing technology needs to open the cover of the maintenance box in the existing test process, and the anti -explosion performance is easy to destroy frequently opening the maintenance box, and the instrument of test use must satisfy the anti -explosion requirement, provide a kind of anti -explosion control box.The anti -explosion control box includes anti -explosion control box ontology, and anti -explosion control box ontology is connected with anti -explosion maintenance box, and there is line switching device inside anti -explosion control box ontology, for carrying out electric leakage protection test to anti -explosion maintenance box under the condition of not opening anti -explosion maintenance box.Anti -explosion control box ontology is equipped with electric leakage protection tester and change-over switch module inside;Change-over switch module is line switching device;Electric leakage protection tester E ground, and electric leakage protection tester L end is connected with change-over switch module, and change-over switch module is connected with anti -explosion maintenance box;Change-over switch module is connected with the phase line of three-phase line A phase, B phase and C phase in anti -explosion maintenance box only in a moment by switching electric leakage protection tester.

Description

Technical Field

[0001] This utility model relates to the field of explosion-proof maintenance technology, and in particular to an explosion-proof control box. Background Technology

[0002] The explosion-proof maintenance box provides temporary power for on-site construction and maintenance. It has explosion-proof performance, and the sparks generated by the device during operation will not come into contact with any explosive gases that may be present in the outside world, thus avoiding an explosion. It also has overload, short circuit and leakage protection functions. When the leakage current or short circuit current reaches the specified value, it will automatically trip and disconnect the line to ensure the safety of personnel and equipment.

[0003] The explosion-proof maintenance box needs to undergo a leakage current test once a month. The existing testing process requires opening the maintenance box and connecting the test resistors or instruments to the three phases A, B, and C separately for testing. The testing process is time-consuming and laborious, and frequent opening of the maintenance box can easily damage its explosion-proof performance. The instruments used for testing must also meet the explosion-proof requirements. Utility Model Content

[0004] This invention addresses the problems in existing technologies where the testing process requires opening the maintenance box and connecting the three phases (A, B, and C) to test resistors or instruments separately. This process is time-consuming and labor-intensive, and frequent opening of the maintenance box can easily damage its explosion-proof performance. Furthermore, the instruments used for testing must also meet explosion-proof requirements. This invention provides an explosion-proof control box.

[0005] The technical solution adopted in this utility model is:

[0006] An explosion-proof control box includes an explosion-proof control box body, which is connected to an explosion-proof maintenance box. The explosion-proof control box body has a circuit switching device inside, which is used to perform leakage protection testing on the explosion-proof maintenance box without opening it.

[0007] Furthermore, the explosion-proof control box is equipped with a leakage current protection tester and a transfer switch module; the transfer switch module is a line switching device.

[0008] The leakage current protection tester is grounded at terminal E, and terminal L is connected to the transfer switch module, which is connected to the explosion-proof maintenance box. The transfer switch module switches the leakage current protection tester so that it can only connect to one of the three phases (A, B, and C) in the explosion-proof maintenance box at any given time.

[0009] Furthermore, the changeover switch module is connected to the explosion-proof maintenance box via an explosion-proof plug.

[0010] Furthermore, the changeover switch module includes a rotary switch, an A-phase on / off control sub-module, a B-phase on / off control sub-module, a C-phase on / off control sub-module, and a main spindle;

[0011] The A-phase on / off control sub-module, B-phase on / off control sub-module, and C-phase on / off control sub-module are connected to the A-phase line, B-phase line, and C-phase line, respectively, to control the on / off connection of A-phase, B-phase, and C-phase with the L terminal of the leakage protection tester.

[0012] Furthermore, the A-phase on / off control sub-module includes the A-phase tested contact, the A-phase connecting block, and the A-phase test contact; the B-phase on / off control sub-module includes the B-phase tested contact, the B-phase connecting block, and the B-phase test contact; and the C-phase on / off control sub-module includes the C-phase tested contact, the C-phase connecting block, and the C-phase test contact.

[0013] Among them, all components of the A-phase on / off control sub-module, the B-phase on / off control sub-module, and the C-phase on / off control sub-module are conductors;

[0014] The A-phase connecting block, the B-phase connecting block and the C-phase connecting block are at a 60° angle to each other;

[0015] Phase A line is connected to the phase A contact being tested;

[0016] The B-phase line is connected to the B-phase contact being tested;

[0017] The C-phase line is connected to the C-phase contact being tested;

[0018] The A-phase test contact, B-phase test contact, and C-phase test contact are connected to the L terminal of the leakage current protection tester;

[0019] The rotary switch and connecting block are mounted on the main shaft. The force of the tester turning the rotary switch 211 is transmitted to the connecting block of each on / off control sub-module through the main shaft 215.

[0020] Furthermore, the A-phase test contact is divided into a fixed end and a movable end, which are connected by a spring. When the A-phase connecting block rotates to an angle of 0° with the vertical direction, the spring does not deform; when the A-phase connecting block rotates to an angle of non-0° with the vertical direction, the spring deforms.

[0021] Furthermore, the B-phase test contact is divided into a fixed end and a movable end, which are connected by a spring. When the B-phase connecting block rotates to an angle of 0° with the vertical direction, the spring does not deform; when the B-phase connecting block rotates to an angle other than 0° with the vertical direction, the spring deforms.

[0022] Furthermore, the C-phase test contact is divided into a fixed end and a movable end, which are connected by a spring. When the C-phase connecting block rotates to an angle of 0° with the vertical direction, the spring does not deform; when the C-phase connecting block rotates to an angle other than 0° with the vertical direction, the spring deforms.

[0023] Furthermore, the leakage current protection tester is a leakage current protection tester that can automatically increase and decrease the current.

[0024] The beneficial effects of this utility model are:

[0025] The explosion-proof control box provided by this utility model integrates core components such as a leakage current protection tester, a rotary switch, and an explosion-proof plug into its main body. The control box body connects directly to the explosion-proof interface of the explosion-proof maintenance box via the explosion-proof plug, allowing wiring to be completed without additional drilling or opening the cover. During testing, leakage current tests on phases A, B, and C can be performed separately simply by switching the rotary switch positions, without opening the explosion-proof maintenance box. This fully preserves the original explosion-proof sealing structure of the box, eliminating the risk of safety accidents caused by the infiltration of explosive gases at the source. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a circuit connection diagram for the explosion-proof control box and the explosion-proof maintenance box;

[0028] Figure 2 Assembly drawing for the changeover switch module;

[0029] Figure 3a This is a schematic diagram of the on / off control sub-module assembly when the angle between the A-phase connecting block and the vertical direction is 0°.

[0030] Figure 3b This is a schematic diagram of the on / off control sub-module assembly when the angle between the A-phase connecting block and the vertical direction is not 0°.

[0031] Figure 4 This is a schematic diagram showing the angular relationship between the A-phase connecting block, the B-phase connecting block, and the C-phase connecting block. Detailed Implementation

[0032] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0033] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this invention.

[0034] The embodiments of the utility model will now be described in detail with reference to the accompanying drawings.

[0035] The explosion-proof maintenance box 1 provides temporary power for on-site construction and maintenance. It has explosion-proof performance, and the sparks generated by the device during operation will not come into contact with any explosive gases that may be present in the outside world, thus avoiding an explosion. It also has overload, short circuit and leakage protection functions. When the leakage current or short circuit current reaches the specified value, it will automatically trip and disconnect the line to ensure the safety of personnel and equipment.

[0036] According to the specifications, the explosion-proof maintenance box 1 needs to undergo a leakage current test once a month. The existing testing process requires opening the maintenance box and connecting the test resistors or instruments to the three phases A, B, and C separately for testing. The testing process is time-consuming and laborious, and frequent opening of the maintenance box can easily damage its explosion-proof performance. The instruments used for testing must also meet the explosion-proof requirements. Currently, there are no testing instruments on the market that meet the requirements.

[0037] The internal circuitry of the explosion-proof maintenance box 1 provided in this embodiment is as follows:

[0038] The internal circuitry of the explosion-proof maintenance box 1 is shown in the attached diagram. Figure 1 As shown, the internal circuit of the explosion-proof maintenance box 1 includes a three-phase circuit, which is divided into an A-phase circuit, a B-phase circuit, a C-phase circuit, a neutral line N, a grounding line PE, and power supply lines (L1, L2, L3, power supply neutral line N', and power supply grounding line PE').

[0039] Among them, L1 is connected to A, L2 is connected to B, L3 is connected to C, N' is connected to N, and PE' is connected to PE.

[0040] Circuit breaker QF is installed on L1, L2, L3, and N', and QF controls the simultaneous opening and closing of L1, L2, L3, and N'.

[0041] Apart from the components in the internal circuit of the explosion-proof maintenance box 1 mentioned above, other components in the internal circuit of the explosion-proof maintenance box 1 are irrelevant to this embodiment and will not be described here.

[0042] The explosion-proof control box 2 provided in this embodiment includes an explosion-proof control box body, which is connected to the explosion-proof maintenance box 1. The explosion-proof control box body has a line switching device inside, which is used to perform leakage protection test on the explosion-proof maintenance box 1 without opening the explosion-proof maintenance box 1.

[0043] Furthermore, the explosion-proof control box body is equipped with a leakage current protection tester 22 and a changeover switch module 21; the changeover switch module 21 is a line switching device.

[0044] Among them, the leakage current protection tester 22E terminal is grounded, the leakage current protection tester 22L terminal is connected to the transfer switch module 21, and the transfer switch module 21 is connected to the explosion-proof maintenance box 1; the transfer switch module 21 switches so that the leakage current protection tester 22 can only be connected to one phase of the three-phase circuit A, B, and C in the explosion-proof maintenance box 1 at a certain time, as shown in the attached figure. Figure 1 As shown.

[0045] Furthermore, the changeover switch module 21 is connected to the explosion-proof maintenance box 1 via an explosion-proof plug.

[0046] Furthermore, the changeover switch module 21 includes a rotary switch 211, an A-phase on / off control sub-module 212, a B-phase on / off control sub-module 213, a C-phase on / off control sub-module 214, and a main shaft 215.

[0047] The A-phase on / off control sub-module 212, B-phase on / off control sub-module 213, and C-phase on / off control sub-module 214 are connected to the A-phase line, B-phase line, and C-phase line respectively, and control the on / off of A-phase, B-phase, and C-phase with the leakage current protection tester 22L terminal.

[0048] Furthermore, the A-phase on / off control sub-module 212 includes an A-phase tested contact 2122, an A-phase connecting block 2121, and an A-phase test contact 2123; the B-phase on / off control sub-module 213 includes a B-phase tested contact 2132, a B-phase connecting block 2131, and a B-phase test contact 2133; and the C-phase on / off control sub-module 214 includes a C-phase tested contact 2142, a C-phase connecting block 2141, and a C-phase test contact 2143.

[0049] All components of phase A on / off control submodule 212, phase B on / off control submodule 213, and phase C on / off control submodule 214 are conductors;

[0050] A-phase connecting block 2121, B-phase connecting block 2131 and C-phase connecting block 2141 form a 60° angle between each other;

[0051] Phase A line is connected to the phase A test contact 2122;

[0052] The B-phase line is connected to the B-phase test contact 2132;

[0053] The C-phase line is connected to the C-phase test contact 2142;

[0054] Phase A test contact 2123, Phase B test contact 2133, and Phase C test contact 2143 are connected to the 22L terminal of the leakage current protection tester;

[0055] The rotary switch 211 and the connecting block are mounted on the main shaft 215. The force of the tester twisting the rotary switch 211 is transmitted to the connecting block of each on / off control sub-module through the main shaft 215.

[0056] As attached Figure 2 Appendix Figure 3a Appendix Figure 3b Appendix Figure 4 As shown, when the rotary switch 211 is rotated to the vertical direction, the angle between the A-phase connecting block 2121 and the vertical direction is 0°, the angle between the B-phase connecting block 2131 and the vertical direction is -60°, and the angle between the C-phase connecting block 2141 and the vertical direction is 60°. The leakage current protection tester 22L terminal is connected to the A-phase test contact 2122 in the three-phase circuit of the explosion-proof maintenance box 1, disconnected from the B-phase test contact 2132 in the three-phase circuit, and disconnected from the C-phase test contact 2142 in the three-phase circuit; the leakage current protection tester 22L terminal is the test contact.

[0057] When the A-phase connecting block 2121 is rotated to an angle of -60° with the vertical direction, the B-phase connecting block 2131 is at an angle of 60° with the vertical direction, and the C-phase connecting block 2141 is at an angle of 0° with the vertical direction. The leakage current protection tester 22L terminal is disconnected from the A-phase test contact 2122 in the three-phase circuit of the explosion-proof maintenance box 1, disconnected from the B-phase test contact 2132 in the three-phase circuit, and connected to the C-phase test contact 2142 in the three-phase circuit.

[0058] When the A-phase connecting block 2121 is rotated to an angle of 60° with the vertical direction, the B-phase connecting block 2131 is at an angle of 0° with the vertical direction, and the C-phase connecting block 2141 is at an angle of -60° with the vertical direction. The leakage current protection tester 22L is disconnected from the A-phase test contact 2122 in the three-phase circuit of the explosion-proof maintenance box 1, and connected to the B-phase test contact 2132 in the three-phase circuit. The C-phase test contact 2142 in the three-phase circuit is disconnected.

[0059] Furthermore, the A-phase test contact 2123 is divided into a fixed end 2123a and a movable end 2123b. The fixed end 2123a and the movable end 2123b are connected by a spring 2123c. When the A-phase connecting block 2121 rotates to an angle of 0° with the vertical direction, the spring 2123c does not deform, as shown in the attached figure. Figure 3a As shown; when the A-phase connecting block 2121 rotates to an angle with the vertical direction that is not 0°, the spring 2123c deforms, as shown in the attached diagram. Figure 3b As shown;

[0060] Similarly, the B-phase test contact 2133 is divided into a fixed end and a movable end, which are connected by a spring. When the B-phase connecting block 2131 rotates to an angle of 0° with the vertical direction, the spring does not deform; when the B-phase connecting block 2131 rotates to an angle of non-0° with the vertical direction, the spring deforms.

[0061] Similarly, the C-phase test contact 2143 is divided into a fixed end and a movable end, which are connected by a spring. When the C-phase connecting block 2141 rotates to an angle of 0° with the vertical direction, the spring does not deform; when the C-phase connecting block 2141 rotates to an angle of non-0° with the vertical direction, the spring deforms.

[0062] The method of controlling the connection block by rotating the rotary switch 211 makes it easy to control the connection and disconnection between the L terminal of the leakage current protection tester and the A, B, and C phase lines. At the same time, it will not cause the L terminal to be connected to two or three phase lines at the same time, making leakage current testing easier.

[0063] For the included angle, counterclockwise is negative and clockwise is positive.

[0064] Furthermore, the leakage current protection tester 22 is a leakage current protection tester 22 that can automatically increase and decrease the current.

[0065] In this embodiment, when performing a leakage current test, the leakage current protection tester 22 gradually increases the current from 15mA to 100mA. If the circuit breaker QF opens within 0.1 seconds when the current reaches 100mA, the test passes; if the circuit breaker QF does not open within 0.1 seconds, the test fails.

[0066] The beneficial effects of the explosion-proof control box provided in this embodiment are as follows: it achieves "open-cover testing" to ensure explosion-proof performance, completely avoiding the problem of frequent opening of the cover damaging the sealing structure of the box in existing technologies. Existing technologies require opening the maintenance box to connect test components, while the explosion-proof control box 2 provided in this embodiment integrates core components such as the leakage current protection tester 22, rotary switch 211, and explosion-proof plug into the main body of the explosion-proof control box through an integrated design. The main body of the explosion-proof control box is directly connected to the explosion-proof interface of the explosion-proof maintenance box 1 via the explosion-proof plug, completing the wiring without additional drilling or opening the cover. During testing, leakage current testing of the three phases A, B, and C can be performed separately by simply switching the position of the rotary switch 211, without opening the explosion-proof maintenance box 1 throughout the process. This completely preserves the original explosion-proof sealing structure of the box, eliminating the risk of safety accidents caused by the infiltration of explosive gases from the root.

Claims

1. An explosion-proof control box, characterized in that, It includes an explosion-proof control box body, which is connected to an explosion-proof maintenance box. The explosion-proof control box body has a circuit switching device inside, which is used to perform leakage protection tests on the explosion-proof maintenance box without opening it. The explosion-proof control box is equipped with a leakage current protection tester and a transfer switch module; the transfer switch module is a circuit switching device. Among them, the E terminal of the leakage current protection tester is grounded, the L terminal of the leakage current protection tester is connected to the transfer switch module, and the transfer switch module is connected to the explosion-proof maintenance box; the transfer switch module switches so that the leakage current protection tester can only be connected to one of the three phases A, B and C of the explosion-proof maintenance box at a certain time. The changeover switch module is connected to the explosion-proof maintenance box via an explosion-proof plug. The changeover switch module includes a rotary switch, an A-phase on / off control sub-module, a B-phase on / off control sub-module, a C-phase on / off control sub-module, and a main spindle; The A-phase on / off control sub-module, B-phase on / off control sub-module, and C-phase on / off control sub-module are connected to the A-phase line, B-phase line, and C-phase line, respectively, to control the on / off connection of A-phase, B-phase, and C-phase with the L terminal of the leakage protection tester.

2. The explosion-proof control box according to claim 1, characterized in that, The A-phase on / off control sub-module includes the A-phase tested contact, the A-phase connecting block, and the A-phase test contact; the B-phase on / off control sub-module includes the B-phase tested contact, the B-phase connecting block, and the B-phase test contact; the C-phase on / off control sub-module includes the C-phase tested contact, the C-phase connecting block, and the C-phase test contact. Among them, all components of the A-phase on / off control sub-module, the B-phase on / off control sub-module, and the C-phase on / off control sub-module are conductors; The A-phase connecting block, the B-phase connecting block and the C-phase connecting block are at a 60° angle to each other; Phase A line is connected to the phase A contact being tested; The B-phase line is connected to the B-phase contact being tested; The C-phase line is connected to the C-phase contact being tested; The A-phase test contact, B-phase test contact, and C-phase test contact are connected to the L terminal of the leakage current protection tester; The rotary switch and connecting block are mounted on the main shaft. The force of the tester turning the rotary switch 211 is transmitted to the connecting block of each on / off control sub-module through the main shaft 215.

3. The explosion-proof control box according to claim 2, characterized in that, The A-phase test contact is divided into a fixed end and a movable end, which are connected by a spring. When the A-phase connecting block rotates to an angle of 0° with the vertical direction, the spring does not deform; when the A-phase connecting block rotates to an angle of non-0° with the vertical direction, the spring deforms.

4. The explosion-proof control box according to claim 2, characterized in that, The B-phase test contact is divided into a fixed end and a movable end, which are connected by a spring. When the B-phase connecting block rotates to an angle of 0° with the vertical direction, the spring does not deform; when the B-phase connecting block rotates to an angle other than 0° with the vertical direction, the spring deforms.

5. The explosion-proof control box according to claim 2, characterized in that, The C-phase test contact is divided into a fixed end and a movable end, which are connected by a spring. When the C-phase connecting block rotates to an angle of 0° with the vertical direction, the spring does not deform; when the C-phase connecting block rotates to an angle other than 0° with the vertical direction, the spring deforms.

6. The explosion-proof control box according to any one of claims 2-5, characterized in that, The leakage current protection tester is a leakage current protection tester that can automatically increase and decrease the current.

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