Damping current controller and its application

Abstract

The present invention provides a damping current controller and its application, wherein the coil is sleeved on the outer circumference of the insulating coil frame; the magnetic yoke is sleeved outside the coil; the metal damping tube is inserted into the inner hole of the insulating coil frame, and one end of the metal damping tube is open; the core moving contact is arranged in the metal damping tube; the core static contact is insulated and sealedly connected to the opening of the metal damping tube; the damping spring is sleeved on the core moving contact and is located between the core moving contact and the core static contact; the driving bracket has a push rod hole; one end of the driving push rod passes through the push rod hole and is fixedly connected to the core static contact, and moves linearly with the movement of the core static contact; the driving spring is sleeved on the driving push rod and is located between the driving bracket and the core static contact. Its advantages are that one device has two functions at the same time; the control accuracy is improved, and it has anti-seismic characteristics; it can allow short-term overload current to pass through without tripping according to different load characteristics.

Description

Technical Field

[0001] The invention relates to a damping current controller and application of the damping current controller in a circuit breaker. Background Art

[0002] The above-mentioned circuit breakers widely used in China can be generally divided into two types of products for description. One of them is the thermal magnetic (bimetallic) circuit breaker. The advantages of this type of circuit breaker are high breaking capacity, complete variety and modular structure, which is easy to design and apply. The disadvantage is that it uses high power consumption (bimetallic) overload control components (such as Figure 1 In the circuit breaker, the overload release heating element R is used, so its own energy consumption is high; at the same time, because the (bimetallic strip) is affected by the ambient temperature, the normal working range is only (-5℃~+40℃), which cannot adapt to the occasions with large temperature changes; furthermore, because the temperature value has a great influence on the consistency of the (bimetallic strip) element, it is impossible to achieve precise control. Another type of liquid magnetic (oil damping) circuit breaker is a miniature circuit breaker product successfully developed by AiRPAX and AcRLing in the United States in the early 20th century for the needs of military activities in harsh environments. This type of product no longer uses the temperature-sensitive element (bimetallic strip), so it not only has low energy consumption and good accuracy, but also the working environment temperature can reach (-40℃~+85℃), which basically meets the use conditions of most occasions. The liquid magnetic (oil damping) circuit breaker products currently manufactured in China can only be used for applications with low requirements for breaking capacity, small breaking current, and small vibration in use occasions. Moreover, the so-called optional overload tripping time (short, medium, and long) only refers to the (short, medium, and long) tripping time after overload, and there is no characteristic of avoiding (short, medium, and long) overload current. There is almost no return time, and even if the overload current is relatively short, there is only one result in the end, that is, tripping. Therefore, the existing liquid magnetic (oil damping) circuit breakers in China have very narrow uses, mainly in the field of communications. Moreover, many liquid magnetic (oil damping) circuit breaker manufacturers are only low-grade and homogeneous competition. Summary of the invention

[0003] The damping current controller provided by the present invention is a cleverly designed device with two functions at the same time; the control accuracy is improved and it has anti-vibration characteristics; at the same time, the overload tripping time is truly optional, that is, it can allow a short-term overload current to pass through without tripping according to different load characteristics; solve the problems of the prior art to overcome the defects of the prior art.

[0004] The present invention provides a damping current controller, comprising: an insulating coil frame, a coil, a yoke, a damping contact assembly and a driving assembly; the coil is sleeved on the outer circumference of the insulating coil frame; the yoke is sleeved outside the coil; the damping contact assembly comprises a metal damping tube, a metal damping spring, an iron core moving contact, an iron core static contact and an insulating damping medium; the metal damping tube is inserted into the inner hole of the insulating coil frame, and one end of the metal damping tube is open; the iron core moving contact is arranged in the metal damping tube; the iron core static contact is insulated and sealedly connected to the opening of the metal damping tube; the insulating damping medium fills the metal damping tube; The metal damping tube has a metal positioning part near the opening, and the metal damping spring is sleeved on the iron core moving contact and is located between the iron core moving contact and the metal positioning part; the metal damping tube, the metal damping spring and the iron core moving contact are electrically connected; the driving component includes a driving push rod, a driving spring and a driving bracket; the driving bracket has a push rod hole; one end of the driving push rod passes through the push rod hole and is fixedly connected to the iron core static contact, and moves linearly with the movement of the iron core static contact; the driving spring is sleeved on the driving push rod and is located between the driving bracket and the iron core static contact.

[0005] Furthermore, the present invention provides a damping current controller, which may also have the following characteristics: it also includes a first electrode and a second electrode; when the driving spring presses the metal damping tube onto the first electrode, the metal damping tube is electrically connected to the first electrode; and the second electrode is electrically connected to the magnetic yoke.

[0006] Furthermore, the present invention provides a damping current controller, which may also have the following characteristics: under normal conditions, the iron core static contact fits with the yoke to achieve electrical conduction; when the current of the coil is greater than the rated current, the suction force between the iron core moving contact and the iron core static contact is greater than the preload force of the metal damping spring, and the iron core moving contact moves toward the static iron core until the iron core moving contact and the iron core static contact contact; at this time, the metal damping tube and the yoke are electrically conductive.

[0007] Furthermore, the present invention provides a damping current controller, which may also have the following characteristics: when the current of the coil is greater than the short-circuit current, the damping contact assembly is sucked into the insulating coil frame by the magnetic force generated by the coil, the driving spring is compressed, and the driving push rod is pushed out of the driving bracket; at this time, the metal damping tube is separated from the second electrode.

[0008] Furthermore, the present invention provides a damping current controller, which may also have the following characteristics: the insulating coil skeleton is a hollow cylinder; there are two raised positioning rings on the outer circle of the cylinder; the coil is arranged between the two positioning rings; and the yoke is sleeved on the outside of the two positioning rings.

[0009] Furthermore, the present invention provides a damping current controller, which may also have the following characteristics: the damping contact assembly also includes an insulating sealing ring; the insulating sealing ring has a center hole; the insulating sealing ring is sealed and connected to the opening of the metal damping tube; the iron core static contact is sealed and connected to the insulating sealing ring, and the contact point of the iron core static contact passes through the center hole of the insulating sealing ring and extends into the metal damping tube; the metal positioning part is a metal positioning clamp ring; the metal damping tube has a clamping groove; the metal positioning clamp ring is clamped in the clamping groove to press the metal damping spring onto the iron core moving contact.

[0010] Furthermore, the present invention provides a damping current controller, which may also have the following characteristics: one end of the iron core static contact in the metal damping tube has a conical contact point.

[0011] Furthermore, the present invention provides a damping current controller, which may also have the following feature: the metal damping spring is a nonlinear spring.

[0012] In addition, the present invention provides a new type of circuit breaker, including: the above-mentioned damping current controller, circuit breaker contacts and shunt release; one end of the circuit breaker contact is connected to the phase line incoming terminal, and the other end is connected to the incoming terminal of the coil of the damping current controller; the outgoing terminal of the coil is connected to the outgoing terminal of the circuit breaker; one end of the shunt release is connected to the neutral line incoming terminal, and the other end is connected to the first electrode of the damping current controller; the second electrode of the damping current controller is connected to the outgoing terminal of the circuit breaker; the driving push rod of the damping current controller drives the circuit breaker contacts to release.

[0013] Furthermore, the present invention provides a novel circuit breaker, which may also have the following characteristics: the shunt release is a newly added or idle shunt release of the original circuit breaker.

[0014] The present invention provides a damping current controller, which is cleverly designed to have two functions at the same time. It can be used as a control component in a short-circuit instantaneous tripping and an overload inverse time delay tripping in a low-voltage molded case circuit breaker. It can not only replace the function of the short-circuit instantaneous component in the existing thermal magnetic (bimetallic) circuit breaker, but more importantly, it replaces the function of the high power consumption (bimetallic) current overload control component in the existing thermal magnetic (bimetallic) circuit breaker. Thus, while the product's breaking capacity remains basically unchanged, the control accuracy is improved, and the working environment temperature can reach (-40°C to +85°C). The structure of the device also has anti-seismic characteristics, so it is particularly suitable for: (military, field, vehicle, ship), and the overload tripping time is truly optional (short, medium, long), that is, it can allow a short-term overload current (such as a short-term surge current caused by the rectifier circuit and the capacitive load starting and the power grid, the starting current of the motor, etc.) to pass through without tripping according to different load characteristics, and of course the energy consumption is also lower than that of the thermal magnetic (bimetallic) type. Therefore, once the device is integrated into existing products and the cost is reduced, the prospect of replacing existing thermal-magnetic (bimetallic) circuit breakers will be unstoppable and epoch-making. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the circuit schematic diagram of a traditional circuit breaker.

[0016] Figure 2 It is the structural diagram of the damping current controller.

[0017] Figure 3 It is a structural diagram of the damping contact assembly.

[0018] Figure 4 This is the conduction state diagram of the core moving contact and the core static contact in the damping current controller.

[0019] Figure 5 This is the short-circuit tripping state diagram of the damping current controller.

[0020] Figure 6 This is the circuit schematic diagram of the damping current controller used in the circuit breaker. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0022] Figure 2 It is a structural diagram of the damping current controller of the present invention.

[0023] like Figure 2 As shown, in this embodiment, the damping current controller 100 includes: an insulating coil skeleton 110 , a coil 120 , a yoke 130 , a damping contact assembly 140 , a driving assembly 150 , a first electrode 160 and a second electrode 170 .

[0024] The insulating coil skeleton 110 is a hollow cylinder and can be directly or indirectly fixed to the housing of the damping current controller 100. There are two raised positioning rings on the outer circle of the cylinder, namely the upper positioning ring 111 and the lower positioning ring 112. The coil 120 is sleeved on the outer circumference of the insulating coil skeleton 110; and is located between the upper positioning ring 111 and the lower positioning ring 112. The lower end of the coil 120 is the input terminal 121, and the upper end is the output terminal 122. The yoke 130 is sleeved outside the coil 120; and the upper plate of the yoke 130 is at the upper end of the upper positioning ring 111, and the lower plate of the yoke 130 is at the lower end of the lower positioning ring 112. The insulating coil skeleton 110 is made of nylon to achieve insulation between the coil 120 and the yoke 130.

[0025] Figure 3 It is a structural diagram of the damping contact assembly of the present invention.

[0026] like Figure 2 and Figure 3 As shown, the damping contact assembly 140 includes: a metal damping tube 141, an iron core moving contact 142, a metal damping spring 143, an iron core static contact 144, an insulating sealing ring 145, a metal positioning clamp ring 146 and an insulating damping medium.

[0027] The metal damping tube 141 is made of copper and has excellent electrical properties. The metal damping tube 141 is inserted into the inner hole of the insulating coil skeleton 110. In this embodiment, the upper end of the metal damping tube 141 is open. The core moving contact 142 is arranged in the metal damping tube 141. The core static contact 144 is insulated and sealed with the opening of the metal damping tube 141 through the insulating sealing ring 145. The metal damping spring 143 is sleeved on the core moving contact 142 and is located between the core moving contact 142 and the core static contact 144. When the damping current controller 100 is in a normal state, the lower end face of the core static contact 144 fits with the upper end face of the upper plate of the yoke 130 to achieve electrical conduction. The metal damping tube 141 of course also has an insulating damping medium, which is damping oil in this embodiment.

[0028] The insulating seal ring 145 is in a "T" shape and has a center hole 145-1. The vertical portion of the "T"-shaped insulating seal ring 145 is inserted into the metal damping tube 141, and the contact portion between the edge seal ring 145 and the metal damping tube 141 is sealed and connected. The iron core static contact 144 is also in a "T" shape, and the vertical portion passes through the center hole 145-1 of the insulating seal ring 145 and extends into the metal damping tube 141. The contact portion between the insulating seal ring 145 and the iron core static contact 144 is sealed and connected. And the contact point of the iron core static contact 144 is inserted into the center hole of the insulating seal ring 145. One end of the iron core static contact 144 in the metal damping tube 141 has a tapered contact point 144-1 to enhance the contact performance with the iron core moving contact 142. Of course, the tapered contact point can also be set on the iron core moving contact 142.

[0029] The metal damping tube 141 has a slot 141-1. The metal positioning collar 146 is stuck in the slot 141-1, pressing the metal damping spring 143 onto the core moving contact 142. This arrangement realizes electrical conduction between the metal damping tube, the metal damping spring and the core moving contact; and can eliminate the pressure of the metal damping spring 143 on the core static contact 144, so that the setting of the metal damping spring 143 is more accurate. The metal damping spring 143 can use a linear spring or a nonlinear spring according to the load requirements.

[0030] like Figure 2 As shown, the driving assembly 150 includes: a driving bracket 151 , a driving push rod 152 and a driving spring 153 .

[0031] The driving bracket 151 can be fixed directly or indirectly on the housing of the damping current controller 100. The driving bracket 151 has a push rod hole 151-1. The driving push rod 152 is "T"-shaped. The horizontal end of the "T"-shaped driving push rod 152 is arranged above the driving bracket 151, and the vertical end passes through the push rod hole 151-1 and is fixedly connected to the core static contact 144, and moves linearly with the movement of the core static contact 144. The driving spring 153 is sleeved on the driving push rod 152 and is located between the driving bracket 151 and the core static contact 144. The driving spring 153 is a linear spring.

[0032] The first electrode 160 can be directly or indirectly fixed to the housing of the damping current controller 100. In this embodiment, the first electrode 160 is fixed by a rivet 161. The first electrode 160 is made of elastic material to ensure electrical performance when in contact with the metal damping tube 141. The second electrode 170 is fixed to the yoke 130 by resistance welding and is electrically conductive therewith.

[0033] like Figure 2As shown, when the damping current controller 100 is in normal working state, when the driving spring 153 presses the metal damping tube 141 onto the first electrode 160 , the metal damping tube 141 is electrically connected to the first electrode 160 .

[0034] Figure 4 This is the conduction state diagram of the core moving contact and the core static contact in the damping current controller.

[0035] like Figure 4 As shown, when the current of the coil 120 is greater than the rated current, the suction force between the core moving contact 142 and the core static contact 144 is greater than the preload force of the metal damping spring 143, and the core moving contact 142 moves toward the static core until the core moving contact 142 contacts the core static contact 144. At this time, the metal damping tube 141 is electrically connected to the yoke 130; that is, the first electrode 160 and the second electrode 170 are electrically connected.

[0036] Figure 5 This is the short-circuit tripping state diagram of the damping current controller.

[0037] like Figure 5 As shown, when the current of the coil 120 is greater than the short-circuit current, the hysteresis characteristic of the damping medium prevents the instantaneous movement of the core moving contact, so that the damping contact assembly 140 is instantly sucked into the insulating coil skeleton 110 by the magnetic force generated by the coil 120, the driving spring 153 is compressed, and the driving push rod 152 pushes out of the driving bracket 151. At this time, the metal damping tube 141 is separated from the first electrode 160 and the second electrode 170.

[0038] The short-circuit current is obviously greater than the rated current, so the elastic force of the driving spring 153 must be greater than the elastic force 143 of the damping spring.

[0039] Figure 6 This is the circuit schematic diagram of the damping current controller used in the circuit breaker.

[0040] like Figure 6 As shown, the novel circuit breaker includes: a damping current controller 100, a circuit breaker contact K and a shunt release F.

[0041] One end of the circuit breaker contact K is connected to the phase line incoming terminal L, and the other end is connected to the incoming terminal 121 of the coil 120 of the damping current controller 100. The outgoing terminal 122 of the coil 120 is connected to the circuit breaker outgoing terminal L1. One end of the shunt release F is connected to the neutral line incoming terminal N, and the other end is connected to the first electrode 160 of the damping current controller 100. The second electrode 170 of the damping current controller 100 is connected to the circuit breaker outgoing terminal L1. The driving push rod 152 of the damping current controller 100 can drive the circuit breaker contact to trip. Among them, the shunt release F can use a newly added or idle shunt release F in the original circuit breaker, without additional configuration.

[0042] The above embodiments only describe the main features and innovations of this solution. This solution is not limited by the above embodiments. Without departing from the innovation and protection scope of the present invention, this solution may have various changes, and these changes and improvements will fall within the scope of protection required by this solution.

Claims

1. A damping current controller, characterized in that: Including, an insulating coil frame, a coil, a yoke, a damping contact assembly and a driving assembly; Wherein, the coil is sleeved on the outer circumference of the insulating coil skeleton; the magnetic yoke is sleeved outside the coil; The damping contact assembly comprises a metal damping tube, a metal damping spring, an iron core moving contact, an iron core static contact and an insulating damping medium; The metal damping tube is inserted into the inner hole of the insulating coil frame, and one end of the metal damping tube is open; the core moving contact is arranged in the metal damping tube; the core static contact is insulated and sealedly connected to the opening of the metal damping tube; the insulating damping medium fills the metal damping tube; The metal damping tube has a metal positioning portion near the opening, and the metal damping spring is sleeved on the core moving contact and is located between the core moving contact and the metal positioning portion; The metal damping tube, the metal damping spring and the iron core moving contact are electrically connected; The driving assembly includes a driving push rod, a driving spring and a driving bracket; The driving bracket has a push rod hole; one end of the driving push rod passes through the push rod hole and is fixedly connected to the iron core static contact, and moves linearly with the movement of the iron core static contact; the driving spring is sleeved on the driving push rod and is located between the driving bracket and the iron core static contact; Also includes a first electrode and a second electrode; When the driving spring presses the metal damping tube onto the first electrode, the metal damping tube is electrically connected to the first electrode; The second electrode is electrically connected to the magnetic yoke; Under normal conditions, the core static contact fits the magnetic yoke to achieve electrical conduction; When the current of the coil is greater than the rated current, the suction force between the core moving contact and the core static contact is greater than the preload force of the metal damping spring, and the core moving contact moves toward the core static contact until the core moving contact and the core static contact are in contact; At this time, the metal damping tube is electrically connected to the magnetic yoke; When the current of the coil is greater than the short-circuit current, the damping contact assembly is sucked into the insulating coil frame by the magnetic force generated by the coil, the driving spring is compressed, and the driving ejector rod ejects the driving bracket; At this time, the metal damping tube is separated from the second electrode.

2. The damping current controller according to claim 1, characterized in that: in, The insulating coil skeleton is a hollow cylindrical shape; The outer circle of the cylinder is provided with two raised positioning rings; The coil is arranged between the two positioning rings; The magnetic yoke is sleeved on the outer sides of the two positioning rings.

3. The damping current controller according to claim 1, characterized in that: in, The damping contact assembly further comprises an insulating sealing ring; the insulating sealing ring has a central hole; The insulating sealing ring is sealed and connected to the opening of the metal damping tube; the iron core static contact is sealed and connected to the insulating sealing ring, and the contact point of the iron core static contact passes through the central hole of the insulating sealing ring and extends into the metal damping tube; The metal positioning part is a metal positioning clamp ring; the metal damping tube has a clamping groove; the positioning clamp ring is clamped in the clamping groove to press the metal damping spring onto the core moving contact.

4. The damping current controller according to claim 1, characterized in that: in, The iron core static contact has a tapered contact point at one end inside the metal damping tube.

5. The damping current controller according to claim 1, characterized in that: in, The metal damping spring is a nonlinear spring.

6. A circuit breaker, characterized in that: comprising a damping current controller, a circuit breaker contact and a shunt release as claimed in any one of claims 2 to 5; Wherein, one end of the circuit breaker contact is connected to the phase line incoming terminal, and the other end is connected to the incoming terminal of the coil of the damping current controller; The outlet terminal of the coil is connected to the outlet terminal of the circuit breaker; One end of the shunt release is connected to the neutral line input terminal, and the other end is connected to the first electrode of the damping current controller; The second electrode of the damping current controller is connected to the output terminal of the circuit breaker; the driving push rod of the damping current controller drives the circuit breaker contact to trip.

7. The circuit breaker according to claim 6, characterized in that: in, The shunt release is a newly added or idle shunt release of the original circuit breaker.

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