A new interlocking system for closing the switch cabinet door

Abstract

The present invention relates to a new type of interlock for realizing the door closing operation of a switch cabinet, comprising a cabinet body and a circuit breaker installed in the cabinet body and capable of sliding relative to the inside and outside of the cabinet body, and a circuit breaker chassis vehicle located below the circuit breaker, wherein the circuit breaker chassis vehicle comprises a frame, a screw rod and a handle, and the screw rod is rotated by shaking the handle to realize the advancement and withdrawal of the circuit breaker chassis vehicle, and the characteristic is that: the cabinet body also comprises a middle door of the switch cabinet, the middle door of the switch cabinet has an opening for the handle of the circuit breaker chassis vehicle to penetrate, and the middle door of the switch cabinet is connected with an interlocking structure. Compared with the prior art, the advantage of the present invention is that a new type of interlock is designed to realize the door closing operation, and only after the middle door of the switch cabinet is closed, the shaking handle of the chassis vehicle can be inserted, so as to convert the circuit breaker working position of the closing state and the non-working position of the opening state.

Description

Technical Field

[0001] The invention relates to a novel interlocking structure, in particular to a novel interlocking structure for realizing a door closing operation of a switch cabinet. Background Art

[0002] As an important equipment for power distribution, low-voltage switchgear plays an important role in modern power distribution networks and engineering construction. With the continuous development of modern industry, construction and power industry, more and higher requirements are put forward for the structure and performance of switchgear. The existing cabinet types mainly include GGD, GCK, GCS, MNS, etc. Among them, MNS is a withdrawable switchgear with compact design. It can accommodate more functional units in a smaller space. It has strong structural versatility and flexible assembly. It can meet the requirements of various structural forms, protection levels and use environments. It adopts standard module design and can be composed of standard units such as protection, operation, conversion, control, regulation, and indication. Users can choose any combination according to their needs. The GEAPLUS 2.0MCC low-voltage switchgear is an imported low-voltage switchgear. In its drawer cabinet, the power supply circuit is mainly composed of busbars, independent separation or plug-in incoming plugs, circuit breakers, and outlet plugs and outlet sockets that move synchronously with the drawer. When the power supply drawer unit is in the working position and the circuit breaker is closed and running, if there is no interlocking device, it is easy to cause the incoming plug to separate with power supply, causing arc short circuit and power outage, and damaging the incoming plug and its plugged busbar. Therefore, it is necessary to set up corresponding anti-misoperation devices in accordance with the provisions of the electrical equipment safety specifications. At present, the technical solutions for preventing accidents of GEAPLUS 2.0MCC low-voltage drawer switch cabinets on the market are mostly: once the incoming plug is misoperated, the soft steel rope pin will be used to touch the release button of the circuit breaker to trip the circuit breaker. This is a remedial solution after misoperation. Although it can prevent accidents, it cannot prevent misoperation. In addition, this technical solution is at the cost of power outage, which will affect normal production operations and cause losses. Moreover, the protection level of the drawer unit does not meet the protection level requirements of IP40 when it is separated and in the test position, and the drawer unit is unreliable in locking when in the test position, which is prone to misoperation.

[0003] In addition, when the circuit breaker is closed and running, if there is no interlocking device, it is easy to cause misoperation such as disconnection of the incoming plug with power supply. The circuit breaker chassis has an isolation test device and a working position in the cabinet. Each position is equipped with a positioning device to ensure the reliability of the interlocking. The operation must be performed according to the interlocking anti-misoperation procedure. Various chassis use nuts and screws to push in and out. The operation is light and flexible, suitable for operation by on-duty personnel. When the chassis needs to move the cabinet, it can be easily pulled out with a transfer cart for various inspections and maintenance. The mid-mounted type is used, and the entire chassis is small in size, making inspection and maintenance extremely convenient. For example, a Chinese utility model patent with patent number ZL201920355941.5 (authorization announcement number CN209375003U) entitled "A center cabinet" discloses a center cabinet, which includes a cabinet body, a circuit breaker chamber is arranged in the middle of the cabinet body, and a trolley is arranged in the circuit breaker chamber; the trolley includes a chassis car and a vacuum circuit breaker, and a first moving device is arranged between the chassis car and the vacuum circuit breaker, and the first moving device is a screw transmission mechanism, which includes a screw, and the circuit breaker will have a mechanical locking device to prevent the chassis car from being rocked in and out when the circuit breaker is in the closed state. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide another new interlock for realizing the door closing operation of the switch cabinet by preventing the chassis vehicle from shaking when the circuit breaker is in the closed state in view of the above-mentioned existing technical status.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: the new interlock for realizing the closing operation of the switch cabinet door comprises a cabinet body and a circuit breaker installed in the cabinet body and capable of sliding relative to the inside and outside of the cabinet body, and a circuit breaker chassis vehicle located under the circuit breaker, wherein the circuit breaker chassis vehicle comprises a frame, a screw rod and a handle, and the screw rod is rotated by shaking the handle to realize the advancement and withdrawal of the circuit breaker chassis vehicle, and is characterized in that: the cabinet body also comprises a switch cabinet middle door, the switch cabinet middle door has an opening for the handle of the circuit breaker chassis vehicle to penetrate, and the switch cabinet middle door is connected with an interlocking structure, and the interlocking structure enables the handle of the circuit breaker chassis vehicle to be shaken after penetrating the opening only when the switch cabinet is closed.

[0006] Furthermore, the interlocking structure includes a propping member arranged on the inner surface of the switch cabinet central door facing the circuit breaker chassis, the propping member is located above the opening, and the circuit breaker chassis has a notch at a position corresponding to the opening of the switch cabinet door, and the circuit breaker chassis has sealing components on the left and right sides corresponding to the notch that can at least partially cover the notch, and when the switch cabinet is closed, the propping member can prop open the sealing component to completely expose the notch. When the switch cabinet central door is closed, the propping member can prop open the sealing component to completely expose the notch, so that the handle of the circuit breaker chassis can be shaken after entering the opening.

[0007] Furthermore, the expansion member includes an expansion plate connected to the switch cabinet door, and both side edges of the expansion plate gradually shrink from outside to inside in the direction toward the circuit breaker chassis vehicle.

[0008] Furthermore, the sealing component comprises:

[0009] A U-shaped frame is located outside the notch, and the opening of the U-shaped frame faces the propping member; and the U-shaped frame includes an upper frame bar and a lower frame bar parallel to each other and a vertical frame bar connecting the upper frame bar and the lower frame bar, the center of the vertical frame bar has a through hole for the notch to be exposed, and the vertical frame bar is provided with a first left support plate and a first right support plate on both sides of the through hole;

[0010] a left covering member, for covering a left portion of the notch portion;

[0011] a right covering member, used for covering a right portion of the notch portion;

[0012] a left elastic member, acting on the left covering member, one end of the left elastic member being connected to the left covering member, and the other end of the left elastic member being connected to the first left supporting plate, so that the left elastic member makes the left covering member always have a tendency to cover the left portion of the notch; and

[0013] The right elastic member acts on the right covering member, one end of the right elastic member is connected to the right covering member, and the other end of the left elastic member is connected to the first right supporting plate, so that the right elastic member makes the right covering member always have a tendency to cover the right part of the notch.

[0014] Furthermore, the left covering member includes a left boss, a left transverse connecting portion connected to the lower surface of the left boss, a left vertical connecting wall located on the left side of the left transverse connecting portion, and a left covering plate perpendicular to the left transverse connecting portion, wherein the left vertical connecting portion has a left through hole, and wherein the upper frame strip is provided with a left sliding groove that allows the left boss to be exposed and slide relative to the recessed portion.

[0015] Furthermore, a left pin shaft is provided between the first left support plate and the left covering member, and the left elastic member is a left compression spring, which is sleeved on the left pin shaft, and one end of the left compression spring is connected to the first left support plate, and the other end of the left compression spring is connected to the left vertical connecting wall, and the free end of the left pin shaft can pass through the left through hole of the left vertical connecting part.

[0016] Furthermore, the right covering member includes a right boss, a right transverse connecting portion connected to the lower surface of the right boss, a right vertical connecting wall located on the right side of the right transverse connecting portion, and a right covering plate perpendicular to the right transverse connecting portion, wherein the right vertical connecting portion has a right through hole, and wherein the upper frame strip is provided with a right sliding groove that allows the right boss to be exposed and slide relative to the recessed portion.

[0017] Furthermore, a right pin shaft is provided between the first right support plate and the right covering member, and the right elastic member is a right compression spring, which is sleeved on the right pin shaft, and one end of the right compression spring is connected to the first right support plate, and the other end of the right compression spring is connected to the right vertical connecting wall, and the free end of the right pin shaft can pass through the right through hole of the right vertical connecting part.

[0018] Compared with the prior art, the advantage of the present invention is that a new interlock is designed to realize the door closing operation. Only after the central door of the switch cabinet is closed can the rocking handle of the chassis vehicle be inserted to switch the circuit breaker from the closed state of the working position to the open state of the non-working position. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the switch cabinet in the embodiment of the present invention where the sealing component covers the recess;

[0020] Figure 2 for Figure 1 The enlarged schematic diagram of point A in the middle;

[0021] Figure 3 It is a schematic structural diagram of the right cover member in an embodiment of the present invention;

[0022] Figure 4 It is a structural schematic diagram of the left cover member in an embodiment of the present invention;

[0023] Figure 5 It is a structural schematic diagram of a switch cabinet in an embodiment of the present invention where a notch of a sealing component is exposed;

[0024] Figure 6 It is an enlarged schematic diagram of point B in 5;

[0025] Figure 7This is a schematic diagram of the structure of a U-shaped frame in an embodiment of the present invention;

[0026] Figure 8 It is a schematic structural diagram of the propping member in an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below with reference to the accompanying drawings.

[0028] like Figures 1 to 8 The new interlocking device for closing the switch cabinet door in this embodiment comprises a cabinet 1, a circuit breaker 2 installed in the cabinet 1 and capable of sliding relative to the cabinet 1, and a circuit breaker chassis 3 located under the circuit breaker 2. The circuit breaker chassis 3 comprises a frame 31, a screw rod 32 and a handle 33. The screw rod 32 is rotated by shaking the handle 33 to achieve the advancement and withdrawal of the circuit breaker chassis 3. The cabinet 1 also comprises a switch cabinet middle door 11. The switch cabinet middle door 11 has a function for the circuit breaker chassis 3 to move forward and backward. The handle 33 of the chassis vehicle is inserted into the opening 111, and the central door 11 of the switch cabinet is connected with an interlocking structure. The interlocking structure makes it possible for the handle 33 of the chassis vehicle of the circuit breaker 2 to be shaken after passing through the opening 111 only when the switch cabinet is closed. The door closing operation is realized by a novel interlocking structure. Only after the central door of the switch cabinet is closed can the shaking handle 33 of the chassis vehicle be inserted, thereby converting the circuit breaker 2 from the closed state of the working position to the open state of the non-working position.

[0029] Specifically, the interlocking structure includes a propping member 112 disposed on the inner surface of the switch cabinet central door 11 facing the circuit breaker chassis 3, the propping member 112 is located above the opening 111, and the circuit breaker chassis 3 has a notch 32 at a position corresponding to the opening 111 of the switch cabinet central door 11, and the circuit breaker chassis 3 has a sealing assembly 4 on the left and right sides corresponding to the notch 32 that can at least partially cover the notch 32, and when the switch cabinet is closed, the propping member 112 can prop open the sealing assembly 4 to completely expose the notch 32. When the switch cabinet central door 11 is closed, the propping member 112 can prop open the sealing assembly 4 to completely expose the notch 32, so that the handle 33 of the chassis of the circuit breaker 2 can be shaken after passing through the opening 111. The expansion member 112 includes an expansion plate connected to the central door 11 of the switch cabinet, and both sides of the expansion plate gradually shrink from the outside to the inside in the direction toward the circuit breaker chassis 3.

[0030] The sealing assembly 4 includes a U-shaped frame 41, which is located outside the notch 32, and the opening of the U-shaped frame 41 is oriented toward the propping member 112; and the U-shaped frame 41 includes an upper frame bar 411 and a lower frame bar 412 parallel to each other, and a vertical frame bar 413 connecting the upper frame bar 411 and the lower frame bar 412, the center of the vertical frame bar 413 has a through hole 4131 for exposing the notch 32, and the vertical frame bar 413 is respectively provided with a first left support plate 4132 and a first right support plate 4133 on both sides of the through hole 4131; and a left cover 42 for covering the left part of the notch 32, for covering the notch 32 The right covering member 43 on the right side of the notch portion 32 also includes a left elastic member 44 acting on the left covering member 42, one end of the left elastic member 44 is connected to the left covering member 42, and the other end of the left elastic member 44 is connected to the first left supporting plate 4132, so that the left elastic member 44 makes the left covering member 42 always have a tendency to cover the left side of the notch portion 32; and a right elastic member 45, the right elastic member 45 acts on the right covering member 43, one end of the right elastic member 45 is connected to the right covering member 43, and the other end of the left elastic member 44 is connected to the first right supporting plate 4133, so that the right elastic member 45 makes the right covering member 43 always have a tendency to cover the right side of the notch portion 32. The left cover 42 of this embodiment includes a left convex column 421, a left transverse connecting portion 422 connected to the lower surface of the left convex column 421, a left vertical connecting wall 424 located on the left side of the left transverse connecting portion 422, and a left cover plate 425 perpendicular to the left transverse connecting portion 422, wherein the left vertical connecting wall 424 has a left through hole 4241, wherein the upper frame bar 411 is provided with a left slide groove 4111 that allows the left convex column 421 to be exposed and slide relative to the notch 32. In addition, a left pin 426 is provided between the first left support plate 4132 and the left cover 42, and the left elastic member 44 is a left compression spring, which is sleeved on the left pin 426, and one end of the left compression spring is connected to the first left support plate 4132, and the other end of the left compression spring is connected to the left vertical connecting wall 424, and the free end of the left pin 426 can pass through the left through hole 4241 of the left vertical connecting wall 424.Similarly, the right covering member 43 includes a right convex column 431, a right transverse connecting portion 432 connected to the lower surface of the right convex column 431, a right vertical connecting wall 434 located on the right side of the right transverse connecting portion 432, and a right covering plate 435 perpendicular to the right transverse connecting portion 432, wherein the right vertical connecting wall 434 has a right through hole 4341, the upper frame strip 411 is provided with a right sliding groove 4112 for allowing the right convex column 431 to be exposed and slide relative to the recessed portion 32, a right pin shaft 436 is provided between the first right supporting plate 4133 and the right covering member 43, the right elastic member 45 is a right compression spring, which is sleeved on the right pin shaft 436, and one end of the right compression spring is connected to the first right supporting plate 4133, the other end of the right compression spring is connected to the right vertical connecting wall 434, and the free end of the right pin shaft 436 can pass through the right through hole 4341 of the right vertical connecting wall 434.

[0031] During specific operation, in order to avoid directly inserting the rocking handle 33 to rock the chassis in and out when the central door 11 of the switch cabinet is open, the sealing component 4 of this embodiment can seal the recessed portion 32 for inserting the rocking handle 33 when the switch cabinet is open. Only when the switch cabinet is closed, the roughly trapezoidal propping member 112 arranged in the central door 11 of the switch cabinet can be inserted between the left convex column 421 and the right convex column 431. Since the propping member 112 is trapezoidal in shape, it can squeeze the left convex column 421 and the right convex column 431 apart, so that the left cover member 42 and the right cover member 43 are also squeezed apart together with the left convex column 421 and the right convex column 431, thereby exposing the recessed portion 32. At this time, the left pin shaft 426 extends into the left through hole 4241. The left compression spring is compressed and is in an energy storage state, the right pin shaft 436 extends into the right through hole 4341, the right compression spring is compressed and is also in an energy storage state, and then when the recessed portion 32 is fully opened, the staff can pass the handle 33 through the opening 111 and connect it to the recessed portion 32 to rock the chassis in and out, thereby converting the circuit breaker 2 between the closed state of the working position and the open state of the non-working position. After the circuit breaker 2 is in the non-working position, the center door can be opened. At this time, the right compression spring and the left compression spring, under the action of elastic reset, make the left cover 42 and the right cover 43 together with the left boss 421 and the right boss 431 close together again, thereby closing the recessed portion 32 again.

Claims

1. A novel interlock for realizing a door closing operation of a switch cabinet, comprising a cabinet (1), a circuit breaker (2) installed in the cabinet (1) and capable of sliding relative to the cabinet (1) inside and outside, and a circuit breaker chassis (3) located below the circuit breaker (2), wherein the circuit breaker chassis (3) comprises a frame (31), a screw rod (32) and a handle (33), and the screw rod (32) is rotated by shaking the handle (33) so as to realize the advancement and retreat of the circuit breaker chassis (31), characterized in that: The cabinet body (1) also includes a switch cabinet central door (11), the switch cabinet central door (11) having an opening (111) for a handle (33) of a circuit breaker chassis vehicle (3) to pass through, the switch cabinet central door (11) being connected to an interlocking structure, the interlocking structure enabling the handle (33) of the circuit breaker chassis vehicle (2) to be shaken after passing through the opening (111) only when the switch cabinet is closed; The interlocking structure comprises an opening member (112) arranged on the inner surface of the switch cabinet central door (11) facing the circuit breaker chassis (3); the opening member (112) is located above the opening (111); the circuit breaker chassis (3) has a notch (32) at a position corresponding to the opening (111) of the switch cabinet central door (11); the circuit breaker chassis (3) has sealing components (4) on the left and right sides corresponding to the notch (32) that can at least partially cover the notch (32); when the switch cabinet is in a closed state, the opening member (112) can open the sealing component (4) to completely expose the notch (32); the opening member (112) comprises an opening plate connected to the switch cabinet central door (11); both sides of the opening plate gradually shrink from outside to inside in a direction toward the circuit breaker chassis (3); The sealing component (4) comprises: A U-shaped frame (41) is located outside the notch (32), and the opening of the U-shaped frame (41) faces the opening member (112); the U-shaped frame (41) comprises an upper frame bar (411) and a lower frame bar (412) which are parallel to each other, and a vertical frame bar (413) connecting the upper frame bar (411) and the lower frame bar (412); a through hole (4131) is provided at the center of the vertical frame bar (413) for exposing the notch (32); and a first left support plate (4132) and a first right support plate (4133) are respectively provided on both sides of the through hole (4131) of the vertical frame bar (413); a left covering member (42) for covering the left portion of the notch portion (32); a right covering member (43) for covering the right portion of the notch portion (32); a left elastic member (44) acting on the left covering member (42), one end of the left elastic member (44) being connected to the left covering member (42), and the other end of the left elastic member (44) being connected to the first left supporting plate (4132), so that the left elastic member (44) enables the left covering member (42) to always have a tendency to cover the left portion of the notch portion (32); and a right elastic member (45) acting on the right covering member (43), one end of the right elastic member (45) being connected to the right covering member (43), and the other end of the left elastic member (44) being connected to the first right supporting plate (4133), so that the right elastic member (45) enables the right covering member (43) to always have a tendency to cover the right portion of the notch portion (32); The left covering member (42) comprises a cylindrical left convex column (421), a left transverse connecting portion (422) connected to the lower surface of the left convex column (421), a left vertical connecting wall (424) located on the left side of the left transverse connecting portion (422), and a left covering plate (425) perpendicular to the left transverse connecting portion (422), wherein the left vertical connecting wall (424) has a left through hole (4241), and the upper frame strip (411) is provided with a left sliding groove (4111) that allows the left convex column (421) to be exposed and slide relative to the notch portion (32).

2. The novel interlock for realizing the door closing operation of a switch cabinet according to claim 1 is characterized in that: A left pin shaft (426) is provided between the first left support plate (4132) and the left cover member (42); the left elastic member (44) is a left compression spring, which is sleeved on the left pin shaft (426), and one end of the left compression spring is connected to the first left support plate (4132), and the other end of the left compression spring is connected to the left vertical connecting wall (424), and the free end of the left pin shaft (425) can pass through the left through hole (4241) of the left vertical connecting wall (424).

3. The novel interlock for realizing the door closing operation of the switch cabinet according to claim 2 is characterized in that: The right covering member (43) includes a right convex column (431), a right transverse connecting portion (432) connected to the lower surface of the right convex column (431), a right vertical connecting wall (434) located on the right side of the right transverse connecting portion (432), and a right covering plate (435) perpendicular to the right transverse connecting portion (432), wherein the right vertical connecting wall (434) has a right through hole (4341), and the upper frame strip (411) is provided with a right sliding groove (4112) that allows the right convex column (431) to be exposed and slide relative to the recessed portion (32).

4. The novel interlock for realizing the door closing operation of a switch cabinet according to claim 3 is characterized in that: A right pin shaft (436) is provided between the first right support plate (4133) and the right cover member (43); the right elastic member (45) is a right compression spring, which is sleeved on the right pin shaft (436), and one end of the right compression spring is connected to the first right support plate (4133), and the other end of the right compression spring is connected to the right vertical connecting wall (434), and the free end of the right pin shaft (436) can pass through the right through hole (4341) of the right vertical connecting wall (434).

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