Drawer seat of drawer type circuit breaker and drawer type circuit breaker

Abstract

The invention relates to the field of arc extinguishing or arc extinguishing devices, in particular to a drawer seat of a drawer type circuit breaker and the drawer type circuit breaker. A drawer type circuit breaker comprises a drawer base and a circuit breaker body, the circuit breaker body comprises an arc extinguish chamber, and the arc extinguish chamber is provided with an arc spraying opening; the drawer base comprises a shell, the shell is internally provided with a containing space for containing a circuit breaker body and allowing the circuit breaker to be pushed in and pulled out, the shell is internally provided with a drawer base arc extinguishing device, the drawer base arc extinguishing device is located beside a pushing path of the circuit breaker body, the drawer base arc extinguishing device comprises an arc inlet, and after the circuit breaker body is completely pushed into the containing space, the circuit breaker body is pushed into the containing space. The arc inlet is in butt joint with an arc spraying port of a main body arc extinguishing device of the circuit breaker main body and is used for receiving an electric arc sprayed from the arc extinguishing chamber during use, and the electric arc enters from the arc inlet and completes arc extinguishing in the drawer seat arc extinguishing device; the low-voltage circuit breaker solves the problem that in the prior art, a drawer type circuit breaker is large in size in order to enhance the arc extinguishing capacity of an arc extinguishing chamber of a low-voltage circuit breaker.

Description

Technical Field

[0001] The present invention relates to the field of arc extinguishing or arc eliminating devices, and particularly to a drawer base of a drawer-type circuit breaker and a drawer-type circuit breaker. Background Art

[0002] As an important part of the arc extinguishing characteristics of low-voltage electrical appliances for low-voltage electrical appliance protection, it has always played a crucial role in short-circuit protection. Therefore, the arc extinguishing performance of circuit breakers has been particularly emphasized and is a mandatory inspection item for the 3C certification of low-voltage products. In the prior art, low-voltage arc extinguishing generally uses multiple dense grid plates to form an arc extinguishing chamber. After the arc is divided by the grid plates, it moves outward in the grid plates until the arc is extinguished or ejected from the arc extinguishing chamber. However, even if it is ejected, it will not affect other structures.

[0003] Chinese Patent with the authorization announcement number CN217562504U discloses an arc extinguishing chamber and its circuit breaker. The circuit breaker includes an arc extinguishing structure, and the arc extinguishing structure includes a first grid plate arc extinguishing unit formed by a plurality of parallelly arranged and vertically extending arc extinguishing grid plates located beside the arc leading plate, and a second grid plate arc extinguishing unit formed by a plurality of parallel arc extinguishing grid plates that form a certain angle with the arc extinguishing grid plates of the first grid plate arc extinguishing unit. During arc extinguishing, after the arc is extinguished by the first grid plate arc extinguishing unit, the angle changes, enters the second grid plate arc extinguishing unit, and is secondarily extinguished by the second grid plate arc extinguishing unit. Finally, the harmless arc or gas is ejected upward from the arc ejection port of the second grid plate arc extinguishing unit to achieve the purpose of arc extinguishing.

[0004] However, due to cost and profit reasons, no manufacturer produces the 800V frame circuit breaker structure. Therefore, the existing new energy photovoltaic and wind 800V frame circuit breakers in the market have been using the 400V and 690V structures of distribution products. When the 400V or 690V circuit breakers in the above prior art are applied to the occasions with a voltage level of 800V, when a short circuit occurs and the circuit breaker trips, due to the too high voltage and too large current, the intensity of the arc will also be too high, resulting in the arc extinguishing chamber that can usually meet the requirements being unable to extinguish the arc, and the arc will be ejected. When the arc is ejected, it will still maintain a certain intensity, which will affect other structures and even cause damage to other structures.

[0005] In the prior art, some technical personnel have also proposed to install an additional arc extinguishing device on the circuit breaker body, so that the arc enters the additional arc extinguishing device after being ejected for further arc extinguishing. However, installing an additional arc extinguishing device on the circuit breaker body will increase the volume of the circuit breaker body. At the same time, in order to meet the normal extraction and insertion of the circuit breaker body from the drawer base, the volume of the drawer base also needs to be enlarged to a certain extent. Summary of the Invention

[0006] The object of the present invention is to provide a drawer seat of a drawer type circuit breaker, so as to solve the problem that the drawer seat of the low voltage circuit breaker in the prior art is larger in order to enhance the arc extinguishing ability of the arc extinguishing chamber. The present invention also provides a drawer type circuit breaker, so as to solve the problem that the drawer type circuit breaker in the prior art is larger in order to enhance the arc extinguishing ability of the arc extinguishing chamber.

[0007] A drawer seat of a drawer-type circuit breaker comprises a shell, wherein the shell has an accommodating space for accommodating a circuit breaker body and for pushing and pulling the circuit breaker in, and an arc extinguishing device of the drawer seat is arranged in the shell, and the arc extinguishing device of the drawer seat is located beside the pushing path of the circuit breaker body, and the arc extinguishing device of the drawer seat comprises an arc inlet, and the arc inlet is used to be connected with the arc spraying port of the arc extinguishing chamber of the circuit breaker body and receive the arc sprayed from the arc extinguishing chamber, and the arc enters from the arc inlet and completes arc extinguishing in the arc extinguishing device of the drawer seat.

[0008] The present invention improves the prior art, specifically: a drawer seat arc extinguishing device is added to the drawer seat of the drawer-type circuit breaker, and the drawer seat arc extinguishing device includes an arc inlet, which is connected to the arc spraying port on the circuit breaker body, and the arc sprayed from the arc spraying port is extinguished again to completely extinguish the arc. By adding the drawer seat arc extinguishing device to the drawer seat, the arc that is directly sprayed out and causes damage to other equipment enters the drawer seat arc extinguishing device for arc extinguishing, thereby ensuring that the arc will not affect other equipment. And because the drawer seat arc extinguishing device is arranged on the drawer seat, it does not move with the push-in or pull-out of the circuit breaker body, and the drawer seat does not need to provide a moving space for it, so the drawer seat arc extinguishing device is installed on the drawer seat without causing the drawer seat to be larger in size, which solves the problem that the low-voltage circuit breaker in the prior art causes the drawer seat to be larger in size in order to enhance the arc extinguishing ability of the arc extinguishing chamber.

[0009] Furthermore, the drawer seat arc extinguishing device is a grid-type arc extinguishing device.

[0010] Its advantages are: in the prior art, the arc extinguishing device of the circuit breaker body is generally a grid-type arc extinguishing device, and the drawer seat arc extinguishing device adopts a grid-type arc extinguishing device. Without changing the original arc extinguishing device, it is easy to cooperate with the arc extinguishing chamber on the circuit breaker body, thereby achieving better results. In addition, the grid-type arc extinguishing device is used as the drawer seat arc extinguishing device, which has a simple structure and low cost.

[0011] Furthermore, the drawer seat arc extinguishing device is located above the pushing path of the circuit breaker body and the discharge port is arranged upward.

[0012] The advantages are: the arc extinguishing structure of the drawer-type circuit breaker in the prior art generally adopts a grid-type arc extinguishing device, and the arc spray port is arranged upward, so the drawer seat arc extinguishing device is located above the pushing path of the circuit breaker body, which can better cooperate with the arc extinguishing device on the circuit breaker body without changing the original structure, and better receive the arc. And the discharge port is arranged upward, so that when the gas or harmless arc is discharged, it is discharged upward, and will not cause damage to the equipment around the circuit breaker and the operator, and the safety is good.

[0013] A drawer-type circuit breaker comprises a drawer seat and a circuit breaker body, the circuit breaker body comprises a main body arc extinguishing device, and the main body arc extinguishing device has an arc spraying port; the drawer seat comprises a shell, and the shell has an accommodation space for accommodating the circuit breaker body and for pushing and pulling the circuit breaker, the drawer seat arc extinguishing device is arranged in the shell, the drawer seat arc extinguishing device is located beside the pushing path of the circuit breaker body, and the drawer seat arc extinguishing device comprises an arc inlet port, after the circuit breaker body is completely pushed into the accommodation space, the arc inlet port is connected with the arc spraying port of the main body arc extinguishing device of the circuit breaker body and is used to receive the arc sprayed from the arc extinguishing chamber when in use, the arc enters from the arc inlet port and completes arc extinguishing in the drawer seat arc extinguishing device.

[0014] The present invention improves the prior art. Specifically, the present invention adds a drawer seat arc extinguishing device to the existing drawer-type circuit breaker. The drawer seat arc extinguishing device includes an arc inlet, which is connected to the arc spraying port on the circuit breaker body, and extinguishes the arc ejected from the arc spraying port again, so as to completely extinguish the arc. By adding the drawer seat arc extinguishing device to the drawer seat, the arc that is directly ejected and may cause damage to other equipment enters the drawer seat arc extinguishing device for arc extinguishing, thereby ensuring that the arc will not affect other equipment. And because the drawer seat arc extinguishing device is arranged on the drawer seat, it does not move with the push-in or pull-out of the circuit breaker body, and the drawer seat does not need to provide a moving space for it, so the drawer seat arc extinguishing device is installed on the drawer seat without causing a large increase in the volume of the drawer seat, thereby not causing a large increase in the volume of the entire drawer-type circuit breaker, and solves the problem that the low-voltage circuit breaker in the prior art has a large volume of the drawer-type circuit breaker in order to enhance the arc extinguishing ability of the arc extinguishing chamber.

[0015] Furthermore, the drawer seat arc extinguishing device and the main body arc extinguishing device are both grid-type arc extinguishing devices.

[0016] The advantages are that the arc extinguishing chamber and the drawer seat arc extinguishing device are both grid-type arc extinguishing devices, and the two cooperate with each other to achieve a good arc extinguishing effect. In addition, the arc extinguishing grid is used for arc extinguishing, which has a simple structure and low cost.

[0017] Furthermore, the arc extinguishing grid of the drawer seat arc extinguishing device and the arc extinguishing grid at the arc spraying port of the main body arc extinguishing device are arranged at a certain angle.

[0018] Its advantages are as follows: There is an included angle between the arc extinguishing grid plates of the drawer seat arc extinguishing device and the arc extinguishing grid plates at the arc spraying port of the main body arc extinguishing device, so that the electric arc needs to turn once during its traveling process, further consuming the energy of the electric arc, thereby enhancing the arc extinguishing ability of the device.

[0019] Furthermore, the width of the drawer seat arc extinguishing device is not less than the width of the main body arc extinguishing device, and the length of the drawer seat arc extinguishing device is greater than the length of the arc spraying port of the main body arc extinguishing device.

[0020] Its advantages are as follows: Since the arc extinguishing grid plates of the drawer seat arc extinguishing device and the arc extinguishing grid plates at the arc spraying port of the main body arc extinguishing device are arranged at a certain included angle, the electric arc sprayed by the main body arc extinguishing device is inclined relative to the drawer seat arc extinguishing device. Therefore, the length of the incoming arc port of the drawer seat arc extinguishing device is set to be greater than the arc spraying port, so that even if the electric arc is sprayed obliquely, it will be captured by the drawer seat arc extinguishing device, and the electric arc will not spray out from the connection between the two, thus affecting other devices. And setting the length of the incoming arc port of the drawer seat arc extinguishing device to be greater than the arc spraying port also makes it unnecessary to set a sealing structure between the two, further simplifying the structure of the device and making it easier to push or pull the circuit breaker main body in or out.

[0021] Furthermore, the included angle between the arc extinguishing grid plates of the drawer seat arc extinguishing device and the arc extinguishing grid plates at the arc spraying port of the main body arc extinguishing device is between 45° and 135°.

[0022] Its advantages are as follows: If the included angle is too small, the electric arc will be difficult to enter the drawer seat arc extinguishing device and will be trapped in the main body arc extinguishing structure, which is extremely likely to cause potential safety hazards. If the angle is too large, it will not play a role in consuming energy. Therefore, the included angle should be controlled between 45° and 135°. Controlling the included angle between 45° and 135° can neither cause the electric arc to be trapped in the main body arc extinguishing structure nor consume the energy of the electric arc well.

[0023] Furthermore, the main body arc extinguishing device includes a first grid plate arc extinguishing unit and a second grid plate arc extinguishing unit. The arc extinguishing grid plates of the two arc extinguishing units are arranged at a certain included angle. The outlet of the second grid plate arc extinguishing unit forms an arc spraying port, and the arc extinguishing grid plates of the drawer seat arc extinguishing device are parallel to the arc extinguishing grid plates of the first grid plate arc extinguishing unit.

[0024] Its advantages are as follows: The main body arc extinguishing device includes a first grid plate arc extinguishing unit and a second grid plate arc extinguishing unit. The arc extinguishing grid plates of the two arc extinguishing units are arranged at a certain included angle and the arc extinguishing grid plates of the drawer seat arc extinguishing device are parallel to the arc extinguishing grid plates of the first grid plate arc extinguishing unit, making the path of the electric arc form an S shape, improving the energy consumption of the electric arc.

[0025] Furthermore, the drawer seat arc extinguishing device is located above the main body arc extinguishing device of the circuit breaker main body and the discharge port is arranged upward.

[0026] The advantages are: the drawer seat arc extinguishing device is located above the circuit breaker body, which can better cooperate with the arc extinguishing device on the circuit breaker body and better receive the arc. In addition, the discharge port is arranged upward, so that when the gas or harmless arc is discharged, it is discharged upward, and will not cause damage to the equipment around the circuit breaker and the operator, which is safe. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 : A structural schematic diagram of a drawer-type circuit breaker of an embodiment of a drawer-type circuit breaker of the present invention;

[0028] Figure 2 : a top view of a circuit breaker body of an embodiment of a drawer-type circuit breaker of the present invention;

[0029] Figure 3 : A schematic structural diagram of a circuit breaker body of an embodiment of a drawer-type circuit breaker of the present invention;

[0030] Figure 4 : A cross-sectional view of a drawer seat of an embodiment of a drawer-type circuit breaker of the present invention;

[0031] Figure 5 : A schematic structural diagram of a drawer seat of an embodiment of a drawer-type circuit breaker of the present invention.

[0032] In the figure: 1. drawer seat arc extinguishing device; 11. rivet; 12. arc extinguishing grid; 13. left insulating shell; 14. fixed cover plate; 15. right insulating shell; 16. discharge port; 2. drawer seat; 21. drawer cover; 22. mounting screws; 3. circuit breaker body; 31. arc extinguishing chamber; 311. first grid arc extinguishing unit; 312. second grid arc extinguishing unit; 3121. arc spray port. DETAILED DESCRIPTION

[0033] The basic concept of the invention of the drawer type circuit breaker of the present invention is:

[0034] A drawer-type circuit breaker comprises a drawer seat for pushing and pulling a circuit breaker body of the drawer-type circuit breaker and a circuit breaker body including main structures such as moving and static contacts, wherein the circuit breaker body comprises a main arc extinguishing device for extinguishing arcs, and the main arc extinguishing device has an arc spraying port for spraying electric arcs; the drawer seat comprises a shell, wherein the shell has an accommodating space for accommodating the circuit breaker body and for pushing and pulling the circuit breaker, and the shell is provided with a drawer seat arc extinguishing device for extinguishing the arc sprayed by the main arc extinguishing device so as to enhance the arc extinguishing ability of the entire drawer-type circuit breaker, the drawer seat arc extinguishing device is located on the side of the pushing path of the circuit breaker body, and the drawer seat arc extinguishing device comprises an arc inlet, which is connected with the arc spraying port of the arc extinguishing chamber of the circuit breaker body and receives the arc sprayed from the arc extinguishing chamber, and the arc enters from the arc inlet and completes arc extinguishing in the drawer seat arc extinguishing device.

[0035] When a short circuit occurs, the drawer-type circuit breaker opens, an arc is generated, and the arc enters the main arc extinguishing structure on the circuit breaker body, and is extinguished by the main arc extinguishing structure. Then the arc is ejected from the arc ejection port of the main arc extinguishing structure, and the arc is not harmlessly rendered harmless. Then the arc enters the drawer-type arc extinguishing device through the arc inlet of the drawer-type arc extinguishing device, and is extinguished in the drawer-type arc extinguishing device, thereby achieving the purpose of arc extinguishing.

[0036] The present invention arranges a drawer seat arc extinguishing device on the drawer seat of the drawer type circuit breaker, so that when the arc is ejected, the arc enters the drawer seat arc extinguishing device, thereby completing the arc extinguishing and enhancing the arc extinguishing effect of the drawer type circuit breaker. At the same time, the drawer seat arc extinguishing device is arranged on the drawer seat, so that the drawer seat arc extinguishing device does not need to be pushed in or pulled out with the circuit breaker body in the drawer seat, and the drawer seat does not need to provide a space for the drawer seat arc extinguishing device to move with the circuit breaker body in the drawer seat when providing a space for accommodating the drawer seat arc extinguishing device, so that the drawer type circuit breaker only increases the space for accommodating the drawer seat arc extinguishing device, solving the problem that the low-voltage circuit breaker in the prior art has a larger volume due to the enhancement of the arc extinguishing capacity of the arc extinguishing chamber.

[0037] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0038] Embodiment 1 of the drawer type circuit breaker of the present invention:

[0039] like Figures 1-5 As shown: a drawer-type circuit breaker comprises a drawer seat 2 and a circuit breaker body 3, the circuit breaker body 3 comprises an arc extinguishing chamber 31 (i.e., a main arc extinguishing structure), and the arc extinguishing chamber 31 has an arc spraying port 3121; the drawer seat 2 comprises a shell, the shell has an accommodating space for accommodating the circuit breaker body 3 and for the circuit breaker body 3 to be pushed in and pulled out, a drawer seat arc extinguishing device 1 is arranged in the shell, the drawer seat arc extinguishing device 1 is located on the side of the pushing path of the circuit breaker body 3, the drawer seat arc extinguishing device 1 comprises an arc inlet, the arc inlet is connected with the arc spraying port 3121 of the arc extinguishing chamber 31 of the circuit breaker body 3 and receives the arc sprayed from the arc extinguishing chamber 31, the arc enters from the arc inlet and completes the arc extinguishing in the drawer seat arc extinguishing device 1.

[0040] In low voltage circuit breakers, a grid-type arc extinguishing device is generally used to extinguish arcs, so the arc extinguishing chamber 31 on the circuit breaker body 3 in this embodiment adopts a grid-type arc extinguishing device.

[0041] The drawer seat arc extinguishing device 1 can adopt many kinds of arc extinguishing devices, for example, it can be an electromagnetic arc extinguishing device. The drawer seat arc extinguishing device 1 includes two left and right shells, namely the left insulating shell 13 and the right insulating shell 15, which are interlocked and fixed by rivets 11. The left insulating shell 13 and the right insulating shell 15 are interlocked to form a cavity for accommodating the arc extinguishing structure, and the shell is provided with an arc inlet for connecting with the arc spraying port 3121 of the arc extinguishing chamber 31 of the circuit breaker body 3. An electromagnetic coil is arranged in the cavity. When the arc passes through the coil, the coil is energized, and the arc is extinguished by the magnetic force generated by the coil. However, this method requires a more precise path of the induced arc and is relatively costly. Therefore, it is preferred that the drawer seat arc extinguishing device 1 adopts a grid-type arc extinguishing device. A plurality of parallel insertion holes for inserting the arc extinguishing grid 12 are provided on the left and right insulating shells. The arc extinguishing grid 12 is inserted therein to form an arc extinguishing structure. A fixed cover plate 14 is fixed to the front end of the left and right insulating plates to close the entire drawer seat arc extinguishing device 1, and a through hole connected to the cavity in the insulating shell is opened at the position between the two arc extinguishing grids 12 corresponding to the fixed cover plate 14, and the through hole is used to discharge the gas or harmless arc after the arc extinguishing of the drawer seat arc extinguishing device 1. The through hole constitutes a discharge port 16. The arc extinguishing grid 12 is used for arc extinguishing, which has a simple structure and low cost. Moreover, the arc extinguishing chamber 31 and the drawer seat arc extinguishing device 1 are both arc extinguished by the arc extinguishing grid 12, and the arc extinguishing effect achieved by the cooperation between the two is good.

[0042] At this time, the arc extinguishing grid 12 of the drawer seat arc extinguishing device 1 can be arranged at will, for example: the arc extinguishing grid 12 of the drawer seat arc extinguishing device 1 is arranged in parallel with the arc extinguishing grid at the arc outlet 3121 of the arc extinguishing chamber 31. However, in order to improve the arc extinguishing effect, it is preferred that: the arc extinguishing grid 12 of the drawer seat arc extinguishing device 1 and the arc extinguishing grid at the arc outlet 3121 of the arc extinguishing chamber 31 are arranged at a certain angle. The arc extinguishing grid 12 of the drawer seat arc extinguishing device 1 and the arc extinguishing grid at the arc outlet 3121 of the main body arc extinguishing device are arranged at an angle, so that the arc needs to turn once during the travel process, so that the energy of the arc is further consumed, thereby improving the arc extinguishing ability of the device.

[0043] The arc extinguishing grid 12 of the drawer seat arc extinguishing device 1 and the arc extinguishing grid at the arc outlet 3121 of the arc extinguishing chamber 31 are arranged at a certain angle. The angle between the two is 135°. Of course, in other embodiments, it can also be 35°, 45°, 90°, 145°, etc. However, it is best to control the angle between 45° and 135°. If the angle is too small, it will be difficult for the arc to enter the drawer seat arc extinguishing device 1 and be suffocated in the arc extinguishing chamber 31 (i.e., the main arc extinguishing structure), which is very likely to cause safety hazards. If the angle is too large, it will not consume energy, so the angle should be controlled between 45° and 135°. When the angle is controlled between 45° and 135°, the arc will not be suffocated in the main arc extinguishing structure, and the energy of the arc can be well consumed.

[0044] The shapes of the incoming arc port and the arc ejection port 3121 are rectangular, and the two are butted against each other to introduce the arc from the arc extinguishing chamber 31 into the arc extinguishing device 1 of the drawer seat. Therefore, it is only necessary to keep their shapes the same. However, since the arc extinguishing grid plates 12 of the arc extinguishing device 1 of the drawer seat and the arc extinguishing grid plates at the arc ejection port 3121 of the arc extinguishing chamber 31 are arranged at a certain angle, the arc ejected from the main arc extinguishing device is inclined relative to the arc extinguishing device 1 of the drawer seat. Therefore, if the shapes of the incoming arc port and the arc ejection port 3121 are the same, there may be an arc escaping from the gap between the two and not being captured by the arc extinguishing device 1 of the drawer seat, which may affect or even damage other devices. Therefore, preferably, the width of the arc extinguishing device 1 of the drawer seat is not less than the width of the arc extinguishing chamber 31, and the length of the arc extinguishing device 1 of the drawer seat is greater than the length of the arc ejection port 3121 of the arc extinguishing chamber 31, so that even if the arc is ejected obliquely, it will be captured by the arc extinguishing device 1 of the drawer seat, and the arc will not be ejected from the connection between the two to affect other devices. And by setting the length of the incoming arc port of the arc extinguishing device 1 of the drawer seat to be greater than the length of the arc ejection port 3121, and the width of the arc extinguishing device 1 of the drawer seat is not less than the width of the arc extinguishing chamber 31, it is also not necessary to set a sealing structure between the two, which not only simplifies the structure of the device but also makes it easier to push or pull the main body of the circuit breaker in or out. Of course, in other embodiments, if a sealing structure is provided between the incoming arc port of the arc extinguishing device 1 of the drawer seat and the arc ejection port 3121 of the arc extinguishing chamber 31, the width of the arc extinguishing device 1 of the drawer seat can be the same as the width of the arc extinguishing chamber 31, and the length of the arc ejection port 3121 of the arc extinguishing chamber 31 can be the same as the length of the incoming arc port of the arc extinguishing device 1 of the drawer seat.

[0045] In this embodiment, in order to enhance the arc extinguishing capability of the circuit breaker, the arc extinguishing chamber 31 on the circuit breaker body 3 includes a first grid arc extinguishing unit 311 formed by a plurality of arc extinguishing grids arranged in parallel and extending in the up-down direction, and a second grid arc extinguishing unit 312 formed by a plurality of arc extinguishing grids arranged in parallel and forming a certain angle with the arc extinguishing grids of the first grid arc extinguishing unit 311. The second grid arc extinguishing unit 312 also includes an upward arc spraying port 3121. At this time, it is sufficient to align the arc inlet of the drawer seat arc extinguishing device 1 with the arc spraying port 3121 of the second grid arc extinguishing unit 312, and ensure that the arc extinguishing grid 12 of the drawer seat arc extinguishing device 1 and the arc extinguishing grid of the second grid arc extinguishing unit 312 have a certain angle. However, in order to further enhance the arc extinguishing capability of the drawer-type circuit breaker, the arc extinguishing grid 12 of the drawer seat arc extinguishing device 1 is arranged parallel to the arc extinguishing grid of the first grid arc extinguishing unit 311 and is staggered. The arc extinguishing grids of the first grid arc extinguishing unit 311 and the second grid arc extinguishing unit 312 are arranged at a certain angle, and the arc extinguishing grids 12 of the drawer seat arc extinguishing device 1 are parallel to the arc extinguishing grids of the first grid arc extinguishing unit 311, so that the arc path forms an S shape, which improves the energy consumption of the arc. In addition, the arc extinguishing grids 12 of the drawer seat arc extinguishing device 1 and the arc extinguishing grids of the first grid arc extinguishing unit 311 are arranged in a staggered manner, dividing the arc at different positions, making the arc easier to be extinguished, and further improving the reliability of the device.

[0046] The position of the drawer seat arc extinguishing device 1 is also variable, but it must be ensured that the arc inlet of the drawer seat arc extinguishing device 1 can be connected with the arc outlet 3121 of the arc extinguishing chamber 31. In order to ensure the original structure as much as possible, at this time, it is actually determined according to the position of the arc outlet 3121 on the circuit breaker body 3: for example: when the arc outlet 3121 of the arc extinguishing chamber 31 on the circuit breaker body 3 is on the left, the drawer seat arc extinguishing device 1 is arranged on the left side of its moving path. Alternatively, when the arc outlet 3121 of the arc extinguishing chamber 31 on the circuit breaker body 3 is on the lower side, the drawer seat arc extinguishing device 1 is arranged on the lower side of its moving path. Alternatively, when the arc outlet 3121 of the arc extinguishing chamber 31 on the circuit breaker body 3 is on the front side, the drawer seat arc extinguishing device 1 is arranged on the front side of its moving path. Therefore, the side of the moving path is the peripheral side of the moving path and the front end of the moving path. The arc spout 3121 of the arc extinguishing chamber 31 of the main body 3 of the circuit breaker used in this embodiment is located at the top of the circuit breaker main body 3 and close to the end of the moving path. Therefore, the drawer seat arc extinguishing device 1 is arranged at the top of the circuit breaker main body 3 and at the end of the moving path. Placing the drawer seat arc extinguishing device 1 above the circuit breaker main body 3 can better cooperate with the arc extinguishing device on the circuit breaker main body 3, better receive the arc, and relatively save space. In addition, the discharge port 16 is arranged upward, so that when the gas or harmless arc is discharged, it is discharged upward, and will not cause damage to the equipment around the circuit breaker and the operator, which has good safety.

[0047] During assembly, first combine the left insulating housing 13 with the right insulating housing 15, insert the fixed cover plate 14 into the housing, and lock it with the pin 11. Then insert the arc extinguishing grid plate 12 into the housing through the insertion openings on the left and right insulating housings to form a complete arc extinguishing device 1 for the drawer base. Then fix the arc extinguishing device 1 for the drawer base on the top drawer support cover 21 inside the drawer base 2 with the mounting screws 22. Then insert the circuit breaker main body 3 into the drawer base 2 and push the circuit breaker main body 3 into place. At this time, the arc ejection port 3121 of the arc extinguishing chamber 31 of the circuit breaker main body 3 is docked with the incoming arc port of the arc extinguishing device 1 for the drawer base.

[0048] When in use, the moving and static contacts of the drawer-type circuit breaker are separated, generating an arc. The arc is drawn into the arc extinguishing chamber 31 through the arc guiding piece, and undergoes the first arc extinguishing through the first arc extinguishing structure 311. Then the arc changes direction and enters the second arc extinguishing structure 312, and undergoes the second arc extinguishing through the second arc extinguishing structure 312. If the purpose of arc extinction is not achieved at this time and the arc still exists, the arc will spray out from the arc ejection port 3121 of the second arc extinguishing structure 312, turn again, enter the arc extinguishing device 1 for the drawer base, and undergo the third arc extinction through the arc extinguishing grid plate 12 of the arc extinguishing device 1 for the drawer base. Finally, the gas or harmless arc sprays out from the discharge port 16 on the fixed cover plate 14 of the arc extinguishing device 1 for the drawer base.

[0049]

[0050] An embodiment of the drawer base of the drawer-type circuit breaker of the present invention: its specific structure is the same as the drawer base structure of the drawer-type circuit breaker introduced above, and will not be elaborated herein. The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. The scope of patent protection of the present invention is subject to the claims. All equivalent structural changes made by using the description and drawings of the present invention should, by the same token, be included in the protection scope of the present invention.

Claims

1. A drawer seat of a drawer-type circuit breaker, comprising a housing, wherein the housing has a receiving space for receiving a circuit breaker body (3) and for pushing the circuit breaker in and out. Features: A drawer seat arc extinguishing device (1) is arranged in the housing. The drawer seat arc extinguishing device (1) is located beside the pushing path of the circuit breaker body (3). The drawer seat arc extinguishing device (1) comprises an arc inlet. The arc inlet is used to contact with an arc ejection port (3121) of an arc extinguishing chamber (31) of the circuit breaker body (3) after the circuit breaker body (3) is pushed in and receive an arc ejected from the arc extinguishing chamber (31). The arc enters from the arc inlet and completes arc extinguishing in the drawer seat arc extinguishing device (1).

2. The drawer seat of the drawer-type circuit breaker according to claim 1, Features: The drawer seat arc extinguishing device (1) is a grid-type arc extinguishing device.

3. The drawer seat of the drawer-type circuit breaker according to claim 2, Features: The drawer seat arc extinguishing device (1) is located above the pushing path of the circuit breaker body (3) and the discharge port (16) is arranged upward.

4. A drawer-type circuit breaker, comprising a drawer seat (2) and a circuit breaker body (3), wherein the circuit breaker body (3) comprises a main arc extinguishing device, and the main arc extinguishing device has an arc spraying port (3121); the drawer seat (2) comprises a shell, and the shell has a receiving space for receiving the circuit breaker body (3) and for pushing and pulling the circuit breaker body (3), Features: A drawer seat arc extinguishing device (1) is arranged in the housing. The drawer seat arc extinguishing device (1) is located beside the pushing path of the circuit breaker body (3). The drawer seat arc extinguishing device (1) comprises an arc inlet. After the circuit breaker body (3) is completely pushed into the accommodation space, the arc inlet is connected to the arc ejection port (3121) of the main arc extinguishing device of the circuit breaker body (3) and is used to receive the arc ejected from the arc extinguishing chamber (31) when in use. The arc enters from the arc inlet and completes arc extinguishing in the drawer seat arc extinguishing device (1).

5. The drawer type circuit breaker according to claim 4, Features: The drawer seat arc extinguishing device (1) and the main body arc extinguishing device are both grid-type arc extinguishing devices.

6. The drawer type circuit breaker according to claim 5, Features: The arc extinguishing grid of the drawer seat arc extinguishing device (1) and the arc extinguishing grid at the arc spraying port (3121) of the main body arc extinguishing device are arranged at a certain angle.

7. The drawer type circuit breaker according to claim 6, Features: The width of the drawer seat arc extinguishing device (1) is not less than the width of the main body arc extinguishing device, and the length of the drawer seat arc extinguishing device (1) is greater than the length of the arc spraying port (3121) of the main body arc extinguishing device.

8. The drawer type circuit breaker according to claim 6, Features: The included angle between the arc extinguishing grid (12) of the drawer seat arc extinguishing device (1) and the arc extinguishing grid at the arc spraying port (3121) of the main body arc extinguishing device is between 45° and 135°.

9. The drawer type circuit breaker according to claim 6, Features: The main arc extinguishing device includes a first grid arc extinguishing unit (311) and a second grid arc extinguishing unit (312). The arc extinguishing grids of the two arc extinguishing units are arranged at a certain angle. The outlet of the second grid arc extinguishing unit forms the arc jet port (3121). The arc extinguishing grid (12) of the drawer seat arc extinguishing device (1) is parallel to the arc extinguishing grid of the first grid arc extinguishing unit 311.

10. The draw-out circuit breaker according to claim 5, wherein: the drawer seat arc extinguishing device (1) is located above the main arc extinguishing device of the circuit breaker main body (3), and the discharge port (16) is arranged upward.

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