A three-phase four-wire fire current limiter

Abstract

The present application relates to the technical field of current limiters, and discloses a three-phase four-wire fire-proof current limiter, which includes a current limiter body, the current limiter body has a wiring terminal, the wiring terminal is formed with a wiring cavity, and the wiring terminal has a threaded member for adjusting the size of the wiring cavity; the current limiter body has a through hole corresponding to the wiring cavity on the outer wall, and the current limiter body also has an operation hole corresponding to the threaded member on the outer wall; the current limiter body has a waterproof cover corresponding to the through hole on the outer wall, the waterproof cover is made of flexible waterproof fabric, one end of the waterproof cover is connected to the outer wall of the current limiter body and encloses the corresponding through hole, and the other end of the waterproof cover is surrounded by an elastic band, so that the opening of the waterproof cover has a tendency to shrink; the outer wall of the current limiter body is also hinged with a baffle, which can be rotated to a first position and a second position relative to the current limiter body. The present application can improve the temporary rainproof ability of the current limiter.

Description

Technical Field

[0001] The present application relates to the technical field of current limiters, and in particular to a three-phase four-wire fire-proof current limiter. Background Art

[0002] The three-phase four-wire fire-proof current limiter is an electrical safety device that is mainly used to limit current and prevent fires caused by circuit overload and short circuit. It is mainly composed of current transformers, detection circuits, triggers, etc., and can monitor the current changes of the line in real time. When the current in the line exceeds the preset limit value, the current limiter will automatically cut off the circuit or limit the current to prevent the wires from overheating and causing fires.

[0003] However, the flow limiter has poor rainproof ability in outdoor environment, and needs to be installed with waterproof cover to protect the flow limiter. However, when it is temporarily used without waterproof cover or the waterproof cover is damaged, the rain environment can easily affect the use of the flow limiter, which is not conducive to the operation of the flow limiter. Summary of the invention

[0004] In order to improve the temporary rain protection capability of the current limiter, the present application provides a three-phase four-wire fire protection current limiter.

[0005] The present application provides a three-phase four-wire fire current limiter, which adopts the following technical solution:

[0006] A three-phase four-wire fire current limiter, comprising a current limiter body, the current limiter body having wiring terminals, the wiring terminals each forming a wiring cavity, and the wiring terminals having a threaded member for adjusting the size of the wiring cavity; the current limiter body having through holes corresponding to the wiring cavity one by one on the outer wall, and the current limiter body also having operating holes corresponding to the threaded member one by one on the outer wall;

[0007] The outer wall of the flow limiter body is provided with waterproof covers corresponding to the through holes one by one, the waterproof covers are made of flexible waterproof fabric, one end of the waterproof covers is connected to the outer wall of the flow limiter body and encloses the corresponding through holes, and an elastic band is wound around the opening of the other end of the waterproof covers so that the opening of the waterproof covers has a tendency to shrink;

[0008] A baffle is also hinged on the outer wall of the flow limiter body, and the baffle can be rotated to a first position and a second position relative to the flow limiter body; when the baffle is rotated to the first position, the baffle blocks the operating hole; when the baffle is rotated to the second position, the baffle exposes the operating hole.

[0009] By adopting the above technical solution, a waterproof cover made of flexible waterproof fabric is used, combined with an elastic band to hold the wires tightly after the wires are connected to the wiring cavity, so that rainwater is not easy to enter the current limiter body from the through hole. The hinged baffle makes it easy to open the operating hole when the wiring terminal needs to be operated, and can effectively cover the operating hole in the non-operating state to prevent rainwater from intruding, while maintaining the ventilation effect. Therefore, the current limiter can be exposed to the outdoors when used outdoors, so as to improve the temporary rainproof ability of the heat dissipation effect of the current limiter when used outdoors.

[0010] Optionally, there are multiple wiring terminals, which are divided into two wiring groups, and the two wiring groups are respectively located at the upper and lower ends of the current limiter body; there are two baffles, which correspond to two wiring groups respectively, and each baffle can simultaneously block all the operating holes corresponding to the wiring group.

[0011] By adopting the above technical solution, the connection terminals are grouped and correspond to baffles, so that the operation process can be simplified, and the state of a group of operation holes can be adjusted by moving a baffle.

[0012] Optionally, the operation holes corresponding to the two groups of wiring groups are respectively opened at the upper and lower ends of one side of the flow limiter body, and the operation holes are connected to the inner cavity of the flow limiter body;

[0013] A protrusion protrudes outward from one side of the flow limiter body to separate the operating holes at the upper and lower ends of the flow limiter body; the two baffles are respectively hinged to the upper and lower ends of the flow limiter body, and the ends of the two baffles away from their own hinge points can be magnetically attracted to the protrusions respectively. At this time, the baffle is in the first position, and a ventilation cavity connected to the operating hole is formed between the outer wall of the flow limiter body and the baffle.

[0014] By adopting the above technical solution, the protrusion separates the operating hole and cooperates with the baffle to form a ventilation cavity, thereby enhancing the heat dissipation performance of the equipment, and the magnetic attraction can keep the baffle in the first position without external force.

[0015] Optionally, the baffle has a first locking piece at one end away from its own hinge point, and a second locking piece is provided on the protrusion, and both the first locking piece and the second locking piece have connecting holes; when the baffle abuts against the protrusion, the first locking piece abuts against the second locking piece, and the connecting hole of the first locking piece is connected to the connecting hole of the second locking piece.

[0016] By adopting the above technical solution, the first locking piece and the second locking piece are connected by a lock to improve the stability of the baffle when it is located at the first position, thereby improving the safety of the equipment.

[0017] Optionally, the baffle and the waterproof cover corresponding to the corresponding wiring group have a linkage mechanism, and the linkage mechanism includes a pulling component and a conducting component;

[0018] The pulling assembly corresponds to the waterproof cover one by one and is connected to the corresponding waterproof cover; the conducting assembly cooperates between the pulling assembly and the baffle to drive the pulling assembly to move when the baffle rotates from the first position to the second position, so that the pulling assembly pulls the elastic band to drive the opening of the waterproof cover to expand.

[0019] By adopting the above technical solution, the linkage mechanism can automatically unfold the opening of the waterproof cover when the baffle is opened, which is convenient for operation and improves work efficiency.

[0020] Optionally, each group of the pulling components includes

[0021] An inner ring connected to the outer wall of the flow limiter body and enclosing the corresponding end of the waterproof cover away from the elastic band;

[0022] An outer ring is coaxially sleeved on the outer wall of the inner ring, and has a plurality of ring teeth extending along the circumference of the outer ring. The plurality of ring teeth are distributed axially along the outer ring;

[0023] A plurality of pull rods are arranged along the circumference of the outer ring, one end of the pull rod is hinged to the outer wall of the restrictor body and has a toothed portion, the toothed portion of the pull rod has teeth distributed circumferentially along the hinge axis of the pull rod, and the teeth are meshed with the ring teeth; and

[0024] A connecting rope, the connecting rope is connected to an end of the pull rod away from the toothed portion and an end of the waterproof cover having an elastic band;

[0025] When the outer ring moves upward relative to the inner ring, all the pull rods around the outer ring are driven to rotate outward together to unfold the connecting rope.

[0026] By adopting the above technical solution, the engagement of the pull rod with the ring teeth and the pulling mechanism of the connecting rope realize the precise control of the opening of the waterproof cover, thereby improving the smoothness and accuracy of the operation.

[0027] Optionally, the conductive component includes

[0028] A connecting rod connected between adjacent outer rings to connect all the outer rings corresponding to the same wiring group into a whole;

[0029] a push rod, located between the baffle and the connecting rod, moving on the outer wall of the restrictor body in a direction approaching or moving away from the connecting rod, and having an inclined surface, wherein the distance between the inclined surface and the outer wall of the restrictor body gradually decreases in a direction away from the baffle, and the connecting rod abuts against the inclined surface; and

[0030] A rotating rod is located at one side of the baffle, and the baffle is hinged to the flow restrictor body through the rotating rod; one end of the push rod close to the rotating rod abuts against the outer wall of the rotating rod, and the outer wall of the rotating rod has a first abutting portion and a second abutting portion along its circumference, and the distance from the first abutting portion to the rotating axis of the rotating rod is smaller than the distance from the second abutting portion to the rotating axis of the rotating rod;

[0031] When the baffle is located at the first position, the first abutting portion abuts against the push rod; when the baffle is rotated to the second position, the second abutting portion abuts against the push rod, so that the rotating rod pushes the push rod toward the connecting rod.

[0032] By adopting the above technical solution, the conduction component converts the rotation of the baffle into control of the opening of the waterproof cover, thereby achieving a compact structure and functional integration.

[0033] Optionally, the baffle plate is horizontal when it is rotated to the second position.

[0034] By adopting the above technical solution, the baffle plate is horizontal when in the second position, which makes it easier for operators to place tools and improves the convenience of operation.

[0035] Optionally, the flow limiter body has a support rod hinged on one side of the operating hole, and the baffle has a slot for inserting the support rod. When the end of the support rod away from its own hinge point is inserted into the baffle, the baffle is in the second position.

[0036] By adopting the above technical solution, the design of the support rod and the slot provides additional support for the baffle when it is in the second position, thereby enhancing the stability of the structure.

[0037] Optionally, each of the terminal blocks includes a terminal block and a terminal piece, the terminal block is hollow, the terminal piece is fixed in the current limiter body and extends into the terminal block, the threaded member is rotatably connected to the terminal piece, and the terminal block is threadedly sleeved on the threaded member, and the terminal cavity is formed between the terminal block and the terminal piece.

[0038] In summary, the present application includes at least one of the following beneficial effects:

[0039] 1. The waterproof cover made of flexible waterproof fabric is combined with elastic band to hold the wire tightly to limit the rain from entering the limiter body through the through hole, and the baffle blocks the operation hole to limit the rain from entering the limiter body, so that the limiter has rainproof performance in outdoor environment. At the same time, the hinged baffle design forms a ventilation cavity when blocking the operation hole, further enhancing the heat dissipation effect of the limiter;

[0040] 2. When the baffle is rotated, the pull rod is driven to pull the elastic ring open synchronously to improve the ease of operation and improve the operating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a schematic diagram of the structure of the embodiment of the present application after the waterproof cover, linkage mechanism and baffle are hidden;

[0042] Figure 2 It is a schematic diagram of the explosion structure of the base and the shell of the embodiment of the present application;

[0043] Figure 3 is a schematic diagram of the structure of the wiring terminal in the embodiment of the present application;

[0044] Figure 4 is a schematic diagram of the structure of the baffle in the embodiment of the present application when it is in the first position and cooperates with the waterproof cover;

[0045] Figure 5 is a schematic diagram of the structure of the baffle in the embodiment of the present application when it is in the second position and cooperates with the waterproof cover;

[0046] Figure 6 It is a schematic diagram of the structure of the baffle and the waterproof cover in the embodiment of the present application;

[0047] Figure 7 yes Figure 6 A schematic diagram of the enlarged structure at A in the middle;

[0048] Figure 8 It is a schematic diagram of the structure of the cooperation between the rotating rod and the push rod in the embodiment of the present application.

[0049] Description of reference numerals: 1. current limiter body; 2. terminal; 201. screw member; 202. terminal block; 203. terminal piece; 3. terminal cavity; 4. through hole; 5. operating hole; 6. waterproof cover; 7. elastic band; 8. baffle; 9. terminal assembly; 10. protrusion; 11. ventilation cavity; 12. first locking piece; 13. second locking piece; 14. connecting hole; 15. pulling assembly; 151. inner ring; 152. Outer ring; 153, pull rod; 154, connecting rope; 16, transmission component; 161, connecting rod; 162, push rod; 163, rotating rod; 17, ring teeth; 18, tooth portion; 19, tooth; 20, inclined surface; 21, first abutment portion; 22, second abutment portion; 23, support rod; 24, slot; 25, base; 26, outer shell; 27, operating surface; 28, ring convex; 29, guide portion; 30, guide groove. DETAILED DESCRIPTION

[0050] The following is combined with Figure 1-8 This application is described in further detail.

[0051] The present application embodiment discloses a three-phase four-wire fire current limiter. Figure 1 and Figure 2 The three-phase four-wire fire-proof current limiter includes a current limiter body 1, which is square and has a base 25 and an outer shell 26. The control circuit elements in the current limiter body 1 are installed on the base 25. The outer shell 26 is hollow inside and is used to cover the base 25 so as to enclose the circuit elements on the base 25 inside the outer shell 26.

[0052] Reference Figure 2 The base 25 and the outer shell 26 are jointly clamped to mount the wiring terminals 2. The wiring terminals 2 have multiple terminals and are divided into two wiring groups 9. The wiring terminals 2 in one wiring group 9 are used to connect the incoming lines, and the wiring terminals 2 in the other wiring group 9 are used to connect the outgoing lines.

[0053] Reference Figure 2 and Figure 3 Each terminal block 2 includes a terminal block 202, a terminal piece 203, and a screw member 201. The terminal block 202 moves on the base 25 in a straight line direction and forms a cavity, which passes through the upper and lower ends of the terminal block 202. The moving direction of the terminal block 202 is perpendicular to the direction in which the cavity passes through the terminal block 202. The terminal piece 203 is L-shaped and fixed on the base 25, and one end of the terminal piece 203 extends into the cavity.

[0054] The screw member 201 is in the shape of a bolt, and the rod of the screw member 201 is rotatably connected to the portion of the wiring piece 203 located in the cavity, and at the same time, one side of the wiring seat 202 is threadedly sleeved on the outer wall of the rod of the screw member 201, and the axial direction of the screw member 201 extends horizontally and perpendicular to the direction in which the cavity passes through the wiring seat 202, and the wiring piece 203 extends only to the portion in the wiring seat 202 and the inner wall of the wiring seat 202 to form a wiring cavity 3 into which the power supply line extends. By rotating the screw member 201, the wiring seat 202 can be driven to move along the axis of the screw member 201, so as to adjust the distance between the inner wall of the wiring seat 202 and the wiring piece 203, so as to adjust the size of the wiring cavity 3, so that the wire can be clamped between the wiring piece 203 and the wiring seat 202, and the wire is electrically connected to the components inside the current limiter body 1 through the wiring piece 203.

[0055] The wiring terminals 2 in the two wiring groups 9 are respectively installed at the upper and lower ends of the base 25, the arrangement directions of the multiple wiring terminals 2 in the two wiring groups 9 are parallel to each other, and the through directions of the wiring cavities 3 of the two groups of wiring terminals 2 extend along the height direction of the outer shell 26, the axes of the threaded members 201 of the two groups of wiring terminals 2 are parallel to each other and parallel to the width direction of the outer shell 26, and the heads of the threaded members 201 are both facing one side of the outer shell 26.

[0056] Reference Figure 2 and Figure 3 A plurality of through holes 4 are provided on the upper and lower end surfaces of the outer shell 26. The through holes 4 at the upper end of the outer shell 26 correspond one-to-one to the wiring cavities 3 of the wiring terminals 2 at the upper end of the base 25, and the through holes 4 at the lower end of the outer shell 26 correspond one-to-one to the wiring cavities 3 of the wiring terminals 2 at the lower end of the base 25. The wires are passed through the through holes 4 into the wiring cavities 3.

[0057] A plurality of operating holes 5 are provided on the upper and lower parts of one side of the outer shell 26. The operating holes 5 on the upper part of the outer shell 26 correspond one-to-one to the threaded members 201 on the upper terminal 2 of the base 25, and the operating holes 5 on the lower part of the outer shell 26 correspond one-to-one to the threaded members 201 on the lower terminal 2 of the base 25, and all the operating holes 5 correspond to the heads of the threaded members 201. The wrench can be inserted into the outer shell 26 through the operating holes 5 and fit into the heads of the threaded members 201 to drive the threaded members 201 to rotate.

[0058] Reference Figure 1 and Figure 4The outer shell 26 is provided with a waterproof cover 6 corresponding to the through hole 4. The waterproof cover 6 is cylindrical and made of a flexible waterproof cloth. One end of the waterproof cover 6 is installed on the outer wall of the outer shell 26, and the other end of the waterproof cover 6 is sleeved with an elastic band 7. The waterproof cover 6 has one end of the elastic band 7 folded outward and sewn to form a space for placing the elastic band 7. The elastic band 7 is in a ring shape connected end to end, and when the elastic band 7 is in a natural state, the diameter is smaller than the diameter of the waterproof cover 6, so that the elastic band 7 shrinks the end of the waterproof cover 6 away from the outer shell 26, and the diameter of the elastic band 7 when shrinking is smaller than the outer diameter of the wire connected to the current limiter.

[0059] When installing the wires, the elastic band 7 is pulled open and then the wires are passed through the waterproof cover 6 and extended into the wiring cavity 3. After the wires are connected to the wiring terminals 2, the elastic band 7 is released so that the elastic band 7 drives the waterproof cover 6 to surround and hug the outer wall of the wires, so as to seal the end of the waterproof cover 6 away from the outer shell 26, so that rainwater is not easy to fall from the through hole 4 into the inner part of the outer shell 26.

[0060] Reference Figure 1 and Figure 4 The side of the outer shell 26 with the operation hole 5 is the operation surface 27. A protrusion 10 protrudes outward from the middle of the operation surface 27. The protrusion 10 is in a square structure. The protrusion 10 isolates the operation holes 5 at the upper and lower ends of the outer shell 26, and the screen and buttons in the current limiter are installed on the protrusion 10. Two baffles 8 are hinged on the outer shell 26. The two baffles 8 are respectively hinged on the side of the upper and lower end surfaces of the outer shell 26 close to the operation surface 27. The two baffles 8 correspond to two wiring groups 9 respectively.

[0061] Reference Figure 4 and Figure 5 Specifically, the baffle 8 can rotate relative to the outer shell 26 to a first position and a second position. Figure 1 When the baffle 8 rotates to the first position, the end of the baffle 8 away from its own hinge point abuts against and is magnetically attracted to the protrusion 10. At this time, the baffle 8 is opposite to all the corresponding operating holes 5 in the corresponding wiring group 9, and blocks the path of rainwater entering the operating hole 5. The baffle 8, the operating surface 27 of the outer shell 26 and the protrusion 10 together enclose a triangular ventilation cavity 11, and the ventilation cavity 11 is connected to the operating hole 5. The heat in the limiter body 1 can be dissipated from the operating hole 5 and taken away by the wind flowing through the ventilation cavity 11, and tools such as wrenches and screwdrivers are not easy to enter the ventilation cavity 11 to operate the threaded member 201.

[0062] When the baffle 8 rotates to the second position, the surface of the baffle 8 is parallel to the horizontal plane at the end of the outer shell 26 and perpendicular to the operating surface 27, so that the baffle 8 exposes the operating hole 5. At this time, tools such as wrenches and bolt guides can enter the operating hole 5 from the front of the operating hole 5 to operate the threaded member 201.

[0063] Reference Figure 1 and Figure 4 In addition, an annular protrusion 28 corresponding to the operating hole 5 is integrally formed on the operating surface 27 of the outer shell 26. The annular protrusion 28 encloses the corresponding operating hole 5 and protrudes outward from the operating surface 27, so that rainwater entering the ventilation cavity 11 from the side of the baffle 8 is not easy to enter the operating hole 5.

[0064] Reference Figure 4 and Figure 6 Furthermore, a linkage mechanism is provided between the baffle 8 and the waterproof cover 6 corresponding to the corresponding wiring group 9, and the linkage mechanism is used to pull the elastic rope of the waterproof cover 6 to unfold when the baffle 8 rotates. The linkage mechanism includes a pulling component 15 and a conducting component 16; the pulling component 15 corresponds to the waterproof cover 6 one by one, and is used to pull the corresponding waterproof cover 6. When the baffle 8 rotates to the second position, the conducting component 16 drives all the pulling components 15 of the same group to pull the end of the waterproof cover 6 with the elastic band 7 to unfold, so as to improve the convenience and efficiency of installing the wires.

[0065] Reference Figure 4 and Figure 7 Specifically, regarding the pulling assembly 15, each pulling assembly 15 includes an inner ring 151, an outer ring 152, a pull rod 153 and a connecting rope 154. The inner ring 151 is annular, fixed to the end surface of the outer shell 26 and coaxially sleeved on the corresponding waterproof cover 6 at one end close to the outer shell 26, and the axis of the inner ring 151 extends vertically. The outer ring 152 is annular and coaxially sleeved on the outer wall of the inner ring 151, and the outer peripheral wall of the outer ring 152 has a ring tooth 17 extending along its own circumferential direction, and the ring tooth 17 has a plurality of ring teeth 17, and the plurality of ring teeth 17 are sequentially arranged and distributed along the axial direction of the outer ring 152.

[0066] One end of the pull rod 153 is hinged to the end of the outer shell 26 through a hinge seat, and the end of the pull rod 153 away from the outer shell 26 extends to be opposite to the end of the waterproof cover 6 with the elastic band 7. The connecting rope 154 corresponds to the pull rod 153 one by one, and the two ends of the connecting rope 154 away from each other are respectively connected to the end of the pull rod 153 away from the outer shell 26 and the end of the waterproof cover 6 away from the outer shell 26.

[0067] There are multiple pull rods 153 in each pulling assembly 15, and the multiple pull rods 153 are evenly spaced along the circumference of the outer ring 152, and the pull rod 153 has a tooth portion 18 at one end hinged to the outer shell 26, and the outer wall of the tooth portion 18 has multiple teeth 19 evenly distributed along the circumference of the hinge axis of the pull rod 153, and the teeth 19 are meshed with the ring teeth 17.

[0068] When the end of the outer ring 152 close to the outer shell 26 abuts against the end surface of the outer shell 26, the connecting rope 154 is in a relaxed state, and at this time, the end of the waterproof cover 6 with the elastic band 7 is tightly wrapped around the outer wall of the wire. When the outer ring 152 moves upward, the outer ring 152 drives all the toothed parts 18 around the outer ring 152 to rotate together through the ring teeth 17, so as to drive the end of the pull rod 153 away from the toothed parts 18 to rotate away from the waterproof cover 6, so that the pull rod 153 straightens the connecting rope 154 and applies a pulling force to expand the elastic band 7 through the connecting rope 154, thereby pulling the end of the waterproof cover 6 away from the outer shell 26 to expand through the pull rods 153 around the waterproof cover 6.

[0069] Reference Figure 7 and Figure 8 The conducting component 16 is used to drive the outer ring 152 to move upward when the baffle 8 rotates from the first position to the second position, and to drive the outer ring 152 to move downward when the baffle 8 rotates from the second position to the first position.

[0070] Specifically, the conducting assembly 16 includes a connecting rod 161, a push rod 162, and a rotating rod 163. There are multiple connecting rods 161, which are respectively connected between two adjacent outer rings 152 opposite to the same wiring group 9, so as to connect all the outer rings 152 opposite to the same wiring group 9 into a whole, so as to restrict the outer rings 152 from rotating relative to the inner ring 151 and make the outer rings 152 move together.

[0071] Reference Figure 7 and Figure 8 The push rod 162 corresponds to the connecting rod 161 one by one. The push rod 162 is in a long strip shape perpendicular to the connecting rod 161, and the two ends of the push rod 162 that are far away from each other are respectively opposite to the connecting rod 161 and the baffle 8. The push rod 162 slides on the end surface of the outer shell 26 along its own length direction. Figure 1 The push rod 162 has a dovetail-shaped guide portion 29, and the end surface of the outer shell 26 has a guide groove 30 for the guide portion 29 to slide along the length direction of the push rod 162, so as to guide the sliding of the push rod 162 and limit the push rod 162 from leaving the outer shell 26. An inclined surface 20 is cut and formed on the end of the push rod 162 away from the baffle 8, and the distance between the inclined surface 20 and the end surface of the outer shell 26 gradually decreases in the direction away from the baffle 8, and the connecting rod 161 abuts and is magnetically attracted to the inclined surface 20 of the corresponding push rod 162.

[0072] Reference Figure 4 and Figure 8The rotating rod 163 is in the shape of an elliptical rod and is formed on one side of the baffle 8. A hinge shaft is connected to the end surface of the outer shell 26. The rotating rod 163 is coaxially rotatably sleeved on the hinge shaft, so that the baffle 8 is hinged to the outer shell 26 through the rotating rod 163. The outer wall of the rotating rod 163 has a first abutting portion 21 and a second abutting portion 22 along its own circumference. The first abutting portion 21 is the portion of the rotating rod 163 opposite to its own short axis, and the second abutting portion 22 is the portion of the rotating rod 163 opposite to its own long axis, so that the first abutting portion 21 to the second abutting portion 22 is a continuous arc surface, and the distance from the first abutting portion 21 to the central axis of the rotating rod 163 is smaller than the distance from the second abutting portion 22 to the central axis of the rotating rod 163. The end of the push rod 162 close to the baffle 8 abuts and is magnetically attracted to the outer wall of the rotating rod 163.

[0073] Reference Figure 4 , Figure 7 and Figure 8 When the baffle 8 is in the first position, the push rod 162 abuts against the first abutting portion 21 of the rotating rod 163, and the outer ring 152 abuts against the end surface of the outer shell 26, and the connecting rope 154 is in a relaxed state. When the baffle 8 rotates from the first position to the second position, the rotating rod 163 is driven to rotate until the second abutting portion 22 abuts against the push rod 162, so as to push the push rod 162 toward the connecting rod 161, and the connecting rod 161 and the outer ring 152 are pushed upward through the cooperation between the connecting rod 161 and the inclined surface 20, thereby driving the pull rod 153 to rotate outward, and the pull rod 153 expands the end of the waterproof cover 6 with the elastic band 7 through the connecting rope 154.

[0074] Reference Figure 5 and Figure 8 Furthermore, a support rod 23 is hinged on the operating surface 27 of the outer shell 26. The support rod 23 corresponds to the baffle 8 one by one, and one end of the support rod 23 is hinged on the operating surface 27. A slot 24 is provided on the side of the baffle 8 facing the operating surface 27. The baffle 8 is first rotated away from the first position to a position slightly beyond the second position, and then the free end of the support rod 23 away from its hinge point is rotated toward the baffle 8, and then the baffle 8 is rotated toward the first position. The free end of the support rod 23 can be inserted into the slot 24. At this time, the baffle 8 is in the second position. The support of the support rod 23 on the baffle 8 can limit the rotation of the baffle 8 toward the first position, so as to improve the stability of the baffle 8 when it is in the second position.

[0075] Reference Figure 4In addition, a first locking piece 12 is fixed to one end of the baffle 8 away from its hinge point, and a second locking piece 13 corresponding to the baffle 8 is fixed to the protruding portion 10. A connecting hole 14 is provided on each of the first locking piece 12 and the second locking piece 13. When the baffle 8 is in the first position, the first locking piece 12 abuts against the corresponding second locking piece 13. At this time, the connecting hole 14 on the first locking piece 12 is opposite to and connected to the connecting hole 14 on the second locking piece 13. The operator can lock the first locking piece 12 and the second locking piece 13 with a lock to prevent other unrelated persons from opening the baffle 8 and operating the threaded member 201 through the operating hole 5.

[0076] The implementation principle of a three-phase four-wire fire current limiter in the embodiment of the present application is as follows: when the baffle 8 is rotated to the first position, the baffle 8 blocks the operation hole 5, and the end of the waterproof cover 6 with the elastic band 7 holds the wire passing through the waterproof cover 6 tightly, so that water flow is not easy to enter the outer shell 26. When the wire needs to be disassembled, the baffle 8 is rotated to the second position, and the end of the waterproof cover 6 with the elastic band 7 is driven by the pull rod 153 to expand and expand, so that the wire can be inserted and extended.

[0077] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A three-phase four-wire fire current limiter, characterized in that: The current limiter body (1) comprises a current limiter body (1) having a wiring terminal (2), each of the wiring terminals (2) being formed with a wiring cavity (3), and the wiring terminal (2) having a threaded member (201) for adjusting the size of the wiring cavity (3); the outer wall of the current limiter body (1) has through holes (4) corresponding one-to-one to the wiring cavity (3), and the outer wall of the current limiter body (1) also has operating holes (5) corresponding one-to-one to the threaded member (201); The outer wall of the flow limiter body (1) is provided with waterproof covers (6) corresponding to the through holes (4) one by one, the waterproof covers (6) being made of flexible waterproof fabric, one end of the waterproof covers (6) being connected to the outer wall of the flow limiter body (1) and enclosing the corresponding through holes (4), and an elastic band (7) being wound around the opening of the other end of the waterproof covers (6) so that the opening of the waterproof covers (6) has a tendency to shrink; A baffle (8) is hingedly connected to the outer wall of the flow restrictor body (1), and the baffle (8) can rotate relative to the flow restrictor body (1) to a first position and a second position; when the baffle (8) is rotated to the first position, the baffle (8) blocks the operating hole (5); when the baffle (8) is rotated to the second position, the baffle (8) exposes the operating hole (5); There are a plurality of the wiring terminals (2), and the plurality of the wiring terminals (2) are divided into two wiring groups (9), and the two wiring groups (9) are respectively located at the upper and lower ends of the current limiter body (1); there are two baffles (8), and the two baffles (8) correspond to the two wiring groups (9) respectively, and each baffle (8) can simultaneously cover all the operating holes (5) corresponding to the corresponding wiring group (9); The operating holes (5) corresponding to the two groups of wiring assemblies (9) are respectively opened at the upper and lower ends of one side of the flow limiter body (1), and the operating holes (5) are connected to the inner cavity of the flow limiter body (1); A protrusion (10) protrudes outward from one side of the flow limiter body (1) to separate the operating holes (5) at the upper and lower ends of the flow limiter body (1); the two baffles (8) are respectively hinged to the upper and lower ends of the flow limiter body (1), and the ends of the two baffles (8) away from their hinge points can be magnetically attracted to the protrusions (10), at which time the baffles (8) are located in a first position, and a ventilation cavity (11) connected to the operating hole (5) is formed between the outer wall of the flow limiter body (1) and the baffles (8); The baffle (8) and the waterproof cover (6) corresponding to the corresponding wiring group (9) have a linkage mechanism, and the linkage mechanism includes a pulling component (15) and a conducting component (16); The pulling assembly (15) corresponds to the waterproof cover (6) one by one and is connected to the corresponding waterproof cover (6); the conducting assembly (16) is matched between the pulling assembly (15) and the baffle (8) so as to drive the pulling assembly (15) to move when the baffle (8) rotates from the first position to the second position, so that the pulling assembly (15) pulls the elastic band (7) to drive the opening of the waterproof cover (6) to expand.

2. A three-phase four-wire fire current limiter according to claim 1, characterized in that: The baffle (8) has a first locking piece (12) at one end away from its hinge point, and the protruding portion (10) has a second locking piece (13), and both the first locking piece (12) and the second locking piece (13) have connecting holes (14); when the baffle (8) abuts against the protruding portion (10), the first locking piece (12) abuts against the second locking piece (13), and the connecting hole (14) of the first locking piece (12) is connected to the connecting hole (14) of the second locking piece (13).

3. A three-phase four-wire fire current limiter according to claim 1, characterized in that: Each group of the pulling components (15) comprises An inner ring (151) connected to the outer wall of the flow limiter body (1) and enclosing an end of the corresponding waterproof cover (6) away from the elastic band (7); An outer ring (152) is coaxially sleeved on the outer wall of the inner ring (151), and has an annular tooth (17) extending along its circumference on the outer wall, wherein the annular tooth (17) is provided in plurality, and the plurality of annular teeth (17) are distributed axially along the outer ring (152); A plurality of pull rods (153) are arranged along the circumference of the outer ring (152), one end of the pull rod (153) is hinged to the outer wall of the restrictor body (1) and has a tooth portion (18), the tooth portion (18) of the pull rod (153) has teeth (19) distributed circumferentially along the hinge axis of the pull rod (153), and the teeth (19) are meshed with the ring teeth (17); and A connecting rope (154), the connecting rope (154) being connected to an end of the pull rod (153) away from the toothed portion (18) and an end of the waterproof cover (6) having an elastic band (7); When the outer ring (152) moves upward relative to the inner ring (151), all the pull rods (153) around the outer ring (152) are driven to rotate outward together, so as to unfold the connecting rope (154).

4. A three-phase four-wire fire current limiter according to claim 3, characterized in that: The conductive component (16) comprises A connecting rod (161) connected between adjacent outer rings (152) to connect all the outer rings (152) corresponding to the same wiring assembly (9) into a whole; a push rod (162) located between the baffle plate (8) and the connecting rod (161), moving on the outer wall of the flow restrictor body (1) in a direction approaching or moving away from the connecting rod (161), and having an inclined surface (20), wherein the distance between the inclined surface (20) and the outer wall of the flow restrictor body (1) gradually decreases in a direction away from the baffle plate (8), and the connecting rod (161) abuts against the inclined surface (20); and a rotating rod (163) located at one side of the baffle plate (8), the baffle plate (8) being hinged to the flow restrictor body (1) via the rotating rod (163); an end of the push rod (162) close to the rotating rod (163) abuts against an outer wall of the rotating rod (163), and the outer wall of the rotating rod (163) has a first abutting portion (21) and a second abutting portion (22) along its circumference, and a distance from the first abutting portion (21) to a rotation axis of the rotating rod (163) is smaller than a distance from the second abutting portion (22) to a rotation axis of the rotating rod (163); When the baffle plate (8) is located at the first position, the first abutting portion (21) abuts against the push rod (162); when the baffle plate (8) is rotated to the second position, the second abutting portion (22) abuts against the push rod (162), so that the rotating rod (163) pushes the push rod (162) in a direction close to the connecting rod (161).

5. A three-phase four-wire fire current limiter according to claim 1, characterized in that: When the baffle plate (8) is rotated to the second position, the plate surface is horizontal.

6. A three-phase four-wire fire current limiter according to claim 5, characterized in that: A support rod (23) is hingedly connected to one side of the restrictor body (1) having the operating hole (5); the baffle plate (8) has a slot (24) for inserting the support rod (23); when an end of the support rod (23) away from its hinge point is inserted into the baffle plate (8), the baffle plate (8) is in a second position.

7. A three-phase four-wire fire current limiter according to claim 6, characterized in that: Each of the wiring terminals (2) comprises a wiring seat (202) and a wiring piece (203); the wiring seat (202) is hollow; the wiring piece (203) is fixed in the current limiter body (1) and extends into the wiring seat (202); the threaded member (201) is rotatably connected to the wiring piece (203); the wiring seat (202) is threadedly sleeved on the threaded member (201); and the wiring cavity (3) is formed between the wiring seat (202) and the wiring piece (203).

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