TECHNICAL FIELD
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The present disclosure relates to a switch system with bypass contact.
BACKGROUND
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In the prior art, during the closing collision between the movable contact and the stationary contact of the switch system, there is mechanical vibration and bounce between the movable contact and the stationary contact, which will cause arcing between the movable contact and the stationary contact. This arcing phenomenon will lead to high-temperature fusion welding of the contact surface of the movable contact and the stationary contact, which will lead to the phenomenon that the switch system can not break normally.
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At present, the solution to this problem is mainly to improve by adjusting the contact pressure and the closing speed of the product.
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However, the above two methods have the defects of complex structure and poor stability.
SUMMARY
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In order to solve one or more defects in the existing art, an aspect of the present disclosure provides a switch system with bypass contact, the switch system includes a stationary contact and a movable contact.
- the stationary contact is connected to a power supply, the movable contact is connected to a load.
- the movable contact is movable between an open position and a closed position.
- upon being in the open position, the movable contact is not in contact with the stationary contact.
- upon being in the closed position, the movable contact is in contact with the stationary contact.
- a stationary contact portion and a bypass contact are arranged on the stationary contact.
- a parallel circuit is formed upon a movable contact portion arranged on the movable contact being in contact with the stationary contact portion of the stationary contact and the bypass contact being in contact with the movable contact.
- the power supply supplies power to the load through the parallel circuit.
- the parallel circuit includes a circuit that the power supply is electrically connected with the load through the stationary contact portion of the stationary contact and the movable contact portion of the movable contact in turn.
- the parallel circuit further includes a circuit that the power supply is electrically connected with the load through the stationary contact, the bypass contact, the movable contact in turn.
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According to the above aspect of the present disclosure, the bypass contact includes a first bent part and a second contact part.
- the first bent part is fixedly arranged on the stationary contact.
- the second contact part extends from the first bent part in a direction parallel to a lateral surface of the stationary contact, thereby forming a bypass contact gap between the second contact part and the lateral surface of the stationary contact.
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According to the above aspects of the present disclosure, the bypass contact further includes a third bent part bent relative to the second contact part.
- the first bent part is connected with the third bent part through the second contact part.
- the third bent part extends obliquely from the second contact part in a direction away from the stationary contact, thereby forming a bypass contact gap opening between the third bent part and the lateral surface of the stationary contact.
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According to the above aspects of the present disclosure, the movable contact includes a first movable contact bracket and a second movable contact bracket.
- one end of the first movable contact bracket and one end of the second movable contact bracket are respectively provided with the movable contact portion including an arc contact portion, a first main contact portion and a second main contact portion.
- the first main contact portion and the second main contact portion are arranged side by side in a width direction (transverse direction) of the first movable contact bracket and the second movable contact bracket.
- in a longitudinal direction of the first movable contact bracket and the second movable contact bracket, the arc contact portion is arranged adjacent to the first main contact portion and the second main contact portion and closer to an outer edge of the one end of the first movable contact bracket and the one end of the second movable contact bracket than the first main contact portion and the second main contact portion.
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According to the above aspects of the present disclosure, on a side of the first movable contact bracket and the second movable contact bracket opposite to the arc contact portion, the first main contact portion and the second main contact portion, an oblique angle part is arranged.
upon the oblique angle part being matched with the third bent part of the bypass contact, a smooth contact in a closing process can be ensured.
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According to the above aspects of the present disclosure, the arc contact portion, the first main contact portion and the second main contact portion are made of a conductive metal material.
the arc contact portion, the first main contact portion and the second main contact portion are arranged on the one end of the first movable contact bracket and on the one end of the second movable contact bracket by welding or electroplating, respectively, or the arc contact portion, the first main contact portion and the second main contact portion are integrally formed with the one end of the first movable contact bracket and the one end of the second movable contact bracket, respectively.
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According to the above aspects of the present disclosure, the other end of the first movable contact bracket and the other end of the second movable contact bracket are pivotally connected to an outlet terminal.
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According to the above aspects of the present disclosure, the movable contact further includes a movable contact sleeve and a pressure spring.
the first movable contact bracket and the second movable contact bracket are held in the movable contact sleeve under a joint action of the movable contact sleeve and the pressure spring, wherein the pressure spring acts between the movable contact sleeve and the first movable contact bracket and between the movable contact sleeve and the second movable contact bracket, thereby pressing the first movable contact bracket and the second movable contact bracket toward each other, the one end of the first movable contact bracket and the one end of the second movable contact bracket extend out of the movable contact sleeve.
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According to the above aspects of the present disclosure, a sleeve partition plate is arranged inside the movable contact sleeve.
under the action of the pressure spring, the first movable contact bracket and the second movable contact bracket respectively abut against two sides of the sleeve partition plate.
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According to the above aspects of the present disclosure, for the first movable contact bracket, the first main contact portion and the second main contact portion have a height difference relative to the arc contact portion.
a thickness of the first main contact portion is equal to a thickness of the second main contact portion.
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According to the above aspects of the present disclosure, for the second movable contact bracket, the first main contact portion and the second main contact portion have a height difference h relative to the arc contact portion.
a thickness of the first main contact portion is equal to a thickness of the second main contact portion.
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According to the above aspects of the present disclosure, for the first movable contact bracket, the highest point of a curved surface of the first main contact portion and the highest point of a curved surface of the second main contact portion each has a position difference s with a corresponding arc contact portion edge of the corresponding arc contact portion.
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According to the above aspects of the present disclosure, for the second movable contact bracket, the highest point of a curved surface of the first main contact portion and the highest point of a curved surface of the second main contact portion each has a position difference s with a corresponding arc contact portion edge of the corresponding arc contact portion.
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According to the above aspects of the present disclosure, the stationary contact is provided with a stationary contact notch; upon the switch system cutting off the current, an arc generated between the stationary contact portion of the stationary contact and the arc contact portion, the first main contact portion and the second main contact portion of the movable contact can be guided by the stationary contact notch, so that the arc can be quickly transferred to a arc striking piece, thereby protecting the stationary contact portion, the arc contact portion, the first main contact portion and the second main contact portion from being ablated by the arc.
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According to the above aspects of the present disclosure, one end of the stationary contact is provided with a gradual chamfer part, and the stationary contact portion is arranged on the gradual chamfer part.
the other end of the stationary contact is connected with the power supply through a power supply input terminal.
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According to the above aspects of the present disclosure, upon being in the open position relative to the stationary contact, the movable contact is in a P0 position.
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According to the above aspects of the present disclosure, upon the movable contact rotating to a P1 position relative to the stationary contact, an angle between the P1 position and the P0 position is A1.
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Because of the existence of the position difference s, at the P1 position, the arc contact portion always comes into contact with the stationary contact portion of the stationary contact before a corresponding main contact portion of the first main contact portion and the second main contact portion; the corresponding main contact portion is not in contact with the stationary contact portion of the stationary contact; the oblique angle part of the first movable contact bracket and the second movable contact bracket is not in contact with the bypass contact.
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According to the above aspects of the present disclosure, upon the movable contact further rotating to a P2 position relative to the stationary contact, an angle between the P2 position and P0 position is A2.
- at the P2 position, the oblique angle part of the first movable contact bracket and the second movable contact bracket enters the bypass contact gap opening and starts to contact with the third bent part of the bypass contact.
- at the P2 position, the arc contact portion is kept in contact with the stationary contact portion of the stationary contact.
- the corresponding main contact portion is kept out of contact with the stationary contact portion of the stationary contact.
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According to the above aspects of the present disclosure, the angle A2 and the angle A1 are set as: A2 - A1 > 6°.
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According to the above aspects of the present disclosure, upon the movable contact further rotates to a P3 position relative to the stationary contact, an angle between the P3 position and P0 position is A3.
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Because of the existence of the height difference h, at the P3 position, the corresponding main contact portion starts to contact with the stationary contact portion of the stationary contact, and then the arc contact portion is lifted to separate from the stationary contact portion of the stationary contact.
at the P3 position, the first movable contact bracket and the second movable contact bracket enter the bypass contact gap and start to contact with the second contact part of the bypass contact.
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According to the above aspects of the present disclosure, the angle A3 and the angle A1 are set as: A3 - A1 > 8°.
the angle A3 and the angle A2 are set as: A3 > A2.
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According to the above aspects of the present disclosure, upon the movable contact further rotates to a P4 position relative to the stationary contact, an angle between the P4 position and the P0 position is A4.
- at the P4 position, the corresponding main contact portion is kept in contact with the stationary contact portion of the stationary contact.
- the arc contact portion is kept to be separated from the stationary contact portion of the stationary contact.
- the first movable contact bracket and the second movable contact bracket are kept in contact with the second contact part of the bypass contact and finally contact with the first bent part of the bypass contact.
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According to the above aspects of the present disclosure, the angle A4 and the angle A3 are set as: A4 - A3 > 10°.
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According to the above aspects of the present disclosure, the angle A2 and the angle A1 are set as: A2 - A1 > 6°, so as to ensure that the arc contact portion has safety protection for the bypass contact and prevent the bypass contact from becoming the main arc bearer.
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According to the above aspects of the present disclosure, the angle A3 and the angle A1 are set as: A3 - A1 > 8°, so as to ensure that the arc contact portion has safety protection for the corresponding main contact portion. With the burning loss of arc contact portion in contact life test, this angle difference will be reduced, so the angle difference that is larger than 8° can protect the main contact portion well.
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According to the above aspects of the present disclosure, the angle A3 and the angle A2 are set as: A3 > A2, so as to ensure that the bypass contact has a protective effect on the corresponding main contact portion.
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According to the above aspects of the present disclosure, the angle A4 and the angle A3 are set as: A4 - A3 > 10°, so as to ensure that a stable sliding contact process between the main contact portion and the stationary contact portion, and the product protection structure is more stable.
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The closing operation sequence according to the present disclosure is provided as follows:
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The arc contact portion contacts the stationary contact first, then the bypass contact contacts the movable contact, and finally the main contact portion contacts the stationary contact. Through the above operation sequence, a parallel circuit is formed upon the movable contact portion arranged on the movable contact contacts the stationary contact portion of the stationary contact and the bypass contact contacts the movable contact; the parallel circuit includes a circuit that the power supply is electrically connected with the load through the stationary contact portion of the stationary contact and the movable contact portion of the movable contact in turn; the parallel circuit further includes a circuit that the power supply is electrically connected with the load through the stationary contact, the bypass contact, and the movable contact in turn.
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The formation of this parallel circuit greatly reduces the possibility of generating an arc between the main contact portion and the stationary contact, and ensures the stability of on and off of the product.
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In the closing process, the conduction between the bypass contact and the main contact portion occurs after the arc contact portion contacts the stationary contact; in the opening process, the bypass contact is separated from the main contact portion before the arc contact portion is separated from the stationary contact, thus achieving the protection of the arc contact portion on the bypass contact.
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The bypass contact is elastic as a whole, so that it can elastically press the movable contact against the stationary contact. This is helpful to reduce the mechanical vibration and bounce between the movable contact and the stationary contact in the closing collision process of the switch system, and then reduce the arc-pulling phenomenon between the movable contact and the stationary contact caused by this mechanical vibration and bounce.
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So far, in order to make the detailed description of the present disclosure herein be better understood and the contribution of the present disclosure to the existing art be better recognized, the present disclosure has outlined the contents of the present disclosure quite broadly. Of course, embodiments of the present disclosure will be described below and will form the subject of the appended claims.
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Likewise, those skilled in the art will recognize that the concept on which the present disclosure is based can be easily used as a basis for designing other structures, methods and systems for carrying out the several purposes of the present disclosure. Therefore, it is important that the appended claims should be regarded as including such equivalent structures as long as they do not exceed the spirit and scope of the present disclosure.
BRIEF DESCRIPTION OF DRAWINGS
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Those skilled in the art will have a better understanding of the present disclosure through the following drawings, and the advantages of the present disclosure can be more clearly reflected. The drawings described here are only for illustrative purposes of selected embodiments, not all possible implementations, and are not intended to limit the scope of the present disclosure.
- Fig. 1 shows a switch system in an open state according to the present disclosure;
- Fig. 2 shows a switch system in a closed state according to the present disclosure;
- Fig. 3 shows a schematic diagram of a bypass contact arranged on a stationary contact according to the present disclosure;
- Fig. 4 shows an enlarged schematic diagram of a switch system in a closed state according to the present disclosure;
- Figs. 5 and 6 show two lateral sides of a first movable contact bracket or a second movable contact bracket according to the present disclosure;
- Figs. 7 to 11 respectively show changes in the moving position of a movable contact relative to a stationary contact according to the present disclosure;
- Fig. 12 shows a height difference h between an arc contact portion and a main contact portion of the first movable contact bracket and the second movable contact bracket according to the present disclosure; and
- Fig. 13 shows a position difference s between an arc contact portion and a main contact of the first movable contact bracket and the second movable contact bracket according to the present disclosure.
DETAILED DESCRIPTION
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In the following, specific embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings.
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Fig. 1 shows a switch system in an open state according to an embodiment of the present disclosure. Fig. 2 shows the switch system in a closed state.
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In Figs. 1 and 2, the switch system includes a stationary contact 1 and a movable contact 2, the stationary contact 1 can be connected to a power supply (not shown) and the movable contact 2 that can be connected to a load (not shown).
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In Fig. 1, the movable contact 2 is at an open position, so that the movable contact 2 is not in contact with the stationary contact 1. In Fig. 2, the movable contact 2 is at a closed position, so that the movable contact 2 is in contact with the stationary contact 1, and the power supply supplies power to the load.
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Although only one stationary contact 1 is shown in Fig. 1, it can be understood that there may be another stationary contact (not shown) in a mirror image position with respect to the movable contact 2 in the open state, and the another stationary contact has the same configuration as the stationary contact 1 shown in Fig. 1. The movable contact 2 can be switched between the two stationary contacts.
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The movable contact 2 has a clamping structure and includes a first movable contact bracket 21 and a second movable contact bracket 22.
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The first movable contact bracket 21 and the second movable contact bracket 22 are arranged face to face with respect to each other, and one end of the first movable contact bracket 21 is separated from one end of the second movable contact bracket 22.
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As illustrated by Fig. 5, arc contact portions 211, 221, first main contact portions 212, 222 and second main contact portions 213, 223 are respectively provided on the one end of the first movable contact bracket 21 and the one end of the second movable contact bracket 22.
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As illustrated by Fig. 13, the first main contact portions 212, 222 and the second main contact portions 213, 223 are arranged side by side in a width direction (transverse direction) of the first movable contact bracket 21 and the second movable contact bracket 22.
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In a longitudinal direction of the first movable contact bracket 21 and the second movable contact bracket 22, the arc contact portions 211, 221 are arranged adjacent to the first main contact portions 212, 222 and the second main contact portions 213, 223 and closer to an outer edge of the one end of the first movable contact bracket 21 and an outer edge of the one end of the second movable contact bracket 22 than the first main contact portions 212, 222 and the second main contact portions 213, 223.
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The first main contact portions 212, 222 and the second main contact portions 213, 223 are configured for conducting current; and the arc contact portions 211, 221 are configured for withstanding the burning of arc during an opening process.
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As illustrated by Fig. 6, on the sides of the first movable contact bracket 21 and the second movable contact bracket 22 opposite to the arc contact portions 211, 221, the first main contact portions 212, 222 and the second main contact portions 213, 223, oblique angle parts 214, 224 are provided.
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The arc contact portions 211, 221, the first main contact portions 212, 222 and the second main contact portions 213, 223 are made of conductive metal materials and are arranged on the one end of the first movable contact bracket 21 and the one end of the second movable contact bracket 22 through welding, electroplating or other methods; or the arc contact portions 211, 221, the first main contact portions 212, 222 and the second main contact portions 213, 223 are integrally formed with the one end of the first movable contact bracket 21 and the one end of the second movable contact bracket 22.
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As illustrated by Figs. 1 and 2, the other end of the first movable contact bracket 21 and the other end of the second movable contact bracket 22 are pivotally connected to an outlet terminal 3.
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The outlet terminal 3 is electrically connected with the load.
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As illustrated by Figs. 1 and 2, the movable contact 2 further includes a movable contact sleeve 4 and a pressure spring 5.
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The first movable contact bracket 21 and the second movable contact bracket 22 are held in the movable contact sleeve 4 under a joint action of the movable contact sleeve 4 and the pressure spring 5, the pressure spring 5 acts between the movable contact sleeve 4 and the first movable contact bracket 21 and between the movable contact sleeve 4 and the second movable contact bracket 22, so as to press the first movable contact bracket 21 and the second movable contact bracket 22 toward each other, the one end of the first movable contact bracket 21 and the one end of the second movable contact bracket 22 extend out of the movable contact sleeve 4.
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A contact gap exists between the arc contact portion 211, the first main contact portion 212 and the second main contact portion 213 of the first movable contact bracket 21 and the arc contact portion 221, the first main contact portion 222 and the second main contact portion 223 of the second movable contact bracket 22, respectively.
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Upon the movable contact 2 being at the closed position, a stationary contact portion 11 of the stationary contact 1 can be located in the contact gap and can be in contact with the arc contact portion 211, the first main contact portion 212 and the second main contact portion 213 of the first movable contact bracket 21 and the arc contact portion 221, the first main contact portion 222 and the second main contact portion 223 of the second movable contact bracket 22.
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As illustrated by Fig. 12, for the first movable contact bracket 21, the thickness of the first main contact portion 212 and the thickness of the second main contact portion 213 are greater than the thickness of the arc contact portion 211, that is, the first main contact portion 212 and the second main contact portion 213 are higher than the arc contact portion 211, that is, the first main contact portion 212 and the second main contact portion 213 each have a height difference h with respect to the arc contact portion 211. The thickness of the first main contact portion 212 is equal to the thickness of the second main contact portion 213.
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As illustrated by Fig. 12, for the second movable contact bracket 22, the thickness of the first main contact portion 222 and the thickness of the second main contact portion 223 are greater than the thickness of the arc contact portion 221, that is, the first main contact portion 222 and the second main contact portion 223 are higher than the arc contact portion 221, that is, the first main contact portion 222 and the second main contact portion 223 each have a height difference h with respect to the arc contact portion 221. The thickness of the first main contact portion 222 is equal to the thickness of the second main contact portion 223.
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The height difference h is between 0.01 mm and 0.05 mm, preferably 0.03 mm.
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As illustrated by Fig. 13, for the first movable contact bracket 21, the highest point of a curved surface of the first main contact portion 212 and the highest point of a curved surface of the second main contact portion 213 each have a position difference s with a corresponding arc contact portion edge of the corresponding arc contact portion 211.
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As illustrated by Fig. 13, for the second movable contact bracket 22, the highest point of a curved surface of the first main contact portion 222 and the highest point of a curved surface of the second main contact portion 223 each have a position difference s with a corresponding arc contact portion edge of the corresponding arc contact portion 221.
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As illustrated by Figs. 1 and 2, a sleeve driving part 41 is arranged outside the movable contact sleeve 4. A movable contact driving mechanism (not shown) actuates the first movable contact bracket 21 and the second movable contact bracket 22 to rotate between the open position and the closed position by driving the sleeve driving part 41.
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The sleeve driving part 41 is basically in a shape of an oblate cylinder. A sleeve notch 411 is provided at an outer circumference of the sleeve driving part 41, and a spline-shaped sleeve depression 412 is provided at the center of a top surface of the sleeve driving part 41.
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As illustrated by Fig. 4, a sleeve partition plate 42 is provided inside the movable contact sleeve 4. Under the action of the pressure spring 5, the first movable contact bracket 21 and the second movable contact bracket 22 respectively abut against two sides of the sleeve partition plate 42.
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Fig. 3 shows a stationary contact 1 and a bypass contact 6 provided on the stationary contact 1 according to the above embodiment of the present disclosure.
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The stationary contact 1 is provided with a stationary contact notch 12. Upon the switch system cutting off the current, the arc generated between the stationary contact portion 11 of the stationary contact 1 and the arc contact portions 211, 221, the first main contact portions 212, 222 and the second main contact portions 213, 223 of the movable contact 2 can be guided by the stationary contact notch 12, so that the arc can be quickly transferred to an arc striking piece (not shown), thereby protecting the stationary contact portion 11, the arc contact portions 211, 221, the first main contact portions 212, 222 and the second main contact portions 213, 223 from being ablated by the arc.
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One end of the stationary contact 1 includes a gradual chamfer part 14, thereby facilitating the insertion of the stationary contact portion 11 of the stationary contact 1 into the contact gap. The stationary contact portion 11 is arranged on the gradual chamfer part 14.
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The other end of the stationary contact 1 is connected with the power supply (not shown) through a power supply input terminal 7.
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As illustrated by Fig. 3, the bypass contact 6 made of a conductive metal material includes, for example, but not limited to, a first bent part 61, a second contact part 62 and a third bent part 63 bent relative to the second contact part 62 (the third bent part 63 is optional), the first bent part 61 is connected with the third bent part 63 through the second contact part 62.
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The first bent part 61 is, for example, but not limited to, U-shaped.
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The first bent part 61 is fixedly arranged on the stationary contact 1, for example, but not limited to, by welding, riveting and the like.
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The second contact part 62 extends from the first bent part 61 in a direction substantially parallel to a lateral surface 13 of the stationary contact 1, thereby forming a bypass contact gap 64 between the second contact part 62 and the lateral surface 13 of the stationary contact 1.
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The third bent part 63 extends obliquely from the second contact part 62 in a direction away from the stationary contact 1, thereby forming a bypass contact gap opening 65 between the third bent part 63 and the lateral surface 13 of the stationary contact 1.
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Upon the oblique angle parts 214 and 224 of the first movable contact bracket 21 and the second movable contact bracket 22 being matched with the third bent part 63 of the bypass contact 6, a smooth contact in the closing process can be ensured.
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The bypass contact 6 is elastic as a whole, so that it can elastically press the movable contact 2 against the stationary contact 1. This is helpful to reduce the mechanical vibration and bounce between the movable contact and the stationary contact in the closing collision process of the switch system, and then reduce the arc-pulling phenomenon between the movable contact and the stationary contact caused by this mechanical vibration and bounce.
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Although only the bypass contact 6 provided on one side of the stationary contact 1 is shown in Fig. 3, it can be understood that another bypass contact 6 may be provided on the other side of the stationary contact 1.
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Hereinafter, changes in the moving position and contact state of the movable contact 2 relative to the stationary contact 1 according to the present disclosure will be described with reference to Figs. 7 to 11, respectively.
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In Fig. 7, the movable contact 2 is at the open position, i.e. a P0 position, relative to the stationary contact 1.
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In Fig. 8, the movable contact 2 rotates to a P1 position relative to the stationary contact 1. The angle between the P1 position and the P0 position is A1. Due to the position difference s, at the P1 position, the arc contact portions 211, 221 always come into contact with the stationary contact portion 11 of the stationary contact 1 before corresponding main contact portions (for example, the first main contact portions 212, 222). The corresponding main contact portions (for example, the first main contact portions 212, 222) are not in contact with the stationary contact portion 11 of the stationary contact 1. The oblique angle parts 214, 224 of the first movable contact bracket 21 and the second movable contact bracket 22 are not in contact with the bypass contact 6.
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In Fig. 9, the movable contact 2 further rotates to a P2 position relative to the stationary contact 1. The angle between the P2 position and the P0 position is A2. At the P2 position, the oblique angle parts 214, 224 of the first movable contact bracket 21 and the second movable contact bracket 22 enter the bypass contact gap openings 65 and start to contact the third bent parts 63 of the bypass contacts 6. At the P2 position, the arc contact portions 211, 221 are kept in contact with the stationary contact portion 11 of the stationary contact 1. The corresponding main contact portions (for example, the first main contact portions 212, 222) are kept out of contact with the stationary contact portion 11 of the stationary contact 1.
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The angle A2 and the angle A1 are set as: A2 - A1 > 6°, so as to ensure that the arc contact portion has safety protection for the bypass contact and prevent the bypass contact from becoming the main arc bearer.
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In Fig. 10, the movable contact 2 further rotates to a P3 position relative to the stationary contact 1. The angle between the P3 position and the P0 position is A3. Due to the height difference h, at the P3 position, the corresponding main contact portions (for example, the first main contact portions 212, 222) start to contact the stationary contact portion 11 of the stationary contact 1, and then the arc contact portions 211, 221 are lifted to be separated from the stationary contact portion 11 of the stationary contact 1. At the P3 position, the first movable contact bracket 21 and the second movable contact bracket 22 enter the bypass contact gaps 64 and start to contact the second contact parts 62 of the bypass contacts 6.
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The angle A3 and the angle A1 are set as: A3 - A1 > 8°, so as to ensure that the arc contact portion has safety protection for the corresponding main contact portions. With the burning loss of arc contact portion in contact life test, the angle difference will be reduced, so the angle difference that is larger than 8° can protect the main contact portions well.
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The angle A3 and the angle A2 are set as: A3 > A2, so as to ensure that the bypass contact can protect the corresponding main contact portions.
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In Fig. 11, the movable contact 2 further rotates to a P4 position relative to the stationary contact 1. The angle between the P4 position and the P0 position is A4. At the P4 position, the corresponding main contact portions (e.g., the first main contact portions 212 and 222) are kept in contact with the stationary contact portion 11 of the stationary contact 1. The arc contact portions 211, 221 are kept to be separated from the stationary contact portion 11 of the stationary contact 1. The first movable contact bracket 21 and the second movable contact bracket 22 are kept in contact with the second contact parts 62 of the bypass contacts 6 and finally contact with the first bent parts 61 of the bypass contacts 6.
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The angle A4 and the angle A3 are set as: A4 - A3 > 10°, so as to ensure that a stable sliding contact process between the main contact portions and the stationary contact portion, and the product protection structure is more stable.
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Generally, the closing operation sequence according to the above embodiment of the present disclosure is provided as follows:
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The arc contact portion contacts the stationary contact first, then the bypass contact contacts the movable contact, and finally the main contact portion contacts the stationary contact. Through the above operation sequence, a parallel circuit is formed upon the movable contact portion arranged on the movable contact 2 being in contact with the stationary contact portion of the stationary contact 1 and the bypass contact 6 being in contact with the movable contact 2. The power supply supplies power to the load through the parallel circuit; the parallel circuit includes a circuit that the power supply is electrically connected with the load through the stationary contact portion of the stationary contact 1 and the movable contact portion of the movable contact 2 in turn; the parallel circuit further includes a circuit that the power supply is electrically connected with the load through the stationary contact 1, the bypass contact 6, the movable contact 2 in turn.
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The formation of the parallel circuit greatly reduces the possibility of generating arc between the main contact portion and the stationary contact, and ensures the stability of on and off of the product.
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In the closing process, the conduction between the bypass contact and the main contact portion occurs after the arc contact portion contacts the stationary contact portion; in the opening process, the bypass contact is separated from the main contact portion before the arc contact portion is separated from the stationary contact, thus achieving the protection of the arc contact portion to the bypass contact.
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The foregoing provides illustration and description, but is not intended to be exhaustive or to limit the embodiments to the precise forms disclosed. Modifications and variations are possible in light of the above disclosure, or may be acquired from practice of the embodiments.
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Even if specific combinations of features are recited in the claims and/or disclosed in the specification, these combinations are not intended to limit the disclosure of various embodiments. In fact, many of these features can be combined in ways not specifically recited in the claims and/or not specifically disclosed in the specification. Although each dependent claim listed below may directly depend on only one claim, the disclosure of various embodiments includes each dependent claim in combination with every other claim in the claim set.
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Unless explicitly stated, any element, action or instruction used herein should not be interpreted as critical or essential. In addition, as used herein, the articles "a" and "an" are intended to include one or more items and can be used interchangeably with "one or more". Furthermore, as used herein, the article "the" is intended to include one or more items cited in conjunction with the article "the" and may be used interchangeably with "one or more". Furthermore, as used herein, the term "set" is intended to include one or more items (e.g., related items, unrelated items, combinations of related and unrelated items, etc.) and may be used interchangeably with "one or more". If only one item is intended, the phrase "only one item" or similar language is used. In addition, as used herein, the term "having" and its variants and the like are intended to be open-ended terms. Furthermore, the phrase "based on" is intended to mean "at least partially based on" unless explicitly stated otherwise. In addition, as used herein, the term "or" when used in series is intended to be inclusive and can be used interchangeably with "and/or" unless otherwise specified (for example, if used in combination with "or" or "only one of them").
