CN114429871A - Moving contact pressure maintaining structure, moving contact assembly and dual power transfer switch - Google Patents

Abstract

A moving contact pressure holding structure, the moving contact pressure holding structure acts on a moving contact of a dual power switch, wherein the moving contact pressure holding structure includes at least a pair of spring holders and at least a pair of springs ; the corresponding two spring retainers in the at least one pair of spring retainers are staggered together with respect to each other; the two spring retainers are arranged to connect the two springs in the at least one pair of springs in parallel are respectively installed between the two spring holders; the movable contact is held between the two spring holders and between the two springs. A moving contact assembly includes the moving contact pressure maintaining structure as described above. A dual power transfer switch includes the above-mentioned moving contact pressure maintaining structure.

Description

Moving contact pressure maintaining structure, moving contact assembly and dual power transfer switch

technical field

The present disclosure relates to a pressure maintaining structure for a moving contact, and more particularly, to a pressure maintaining structure for a moving contact of a dual power transfer switch (ATS). The present disclosure also relates to a moving contact assembly including the moving contact pressure maintaining structure as described above. The present disclosure further relates to a dual power transfer switch including the moving contact pressure maintaining structure as described above.

Background technique

The moving contact of the dual power transfer switch (ATS) has bidirectional contacts so as to be in contact with the first stationary contact of the first power source and the second stationary contact of the second power source. The currently used moving contact pressure maintaining mechanism generally includes two independent elastic device devices for the two contacts respectively, which results in a larger space occupied and the problem of unstable contact pressure, especially when the dynamic and static contacts are used. When the contact surface (silver point) of the head becomes thinner due to ablation (that is, the overtravel becomes smaller), the change of the contact pressure is often relatively large, which affects the mechanical and electrical properties of the dual power transfer switch.

In order to improve the rated current carrying capacity and short-time withstand current performance of the ATS, it is usually necessary to install multiple moving contacts side by side. When the ATS is working, the wear of the contact surfaces (silver points) of different moving contacts and static contacts is not constant. Similarly, this requires that the contact pressure of each moving contact is independent of each other, so as to ensure that the electrical properties of each moving contact and the static contact are basically the same, so as to obtain a more stable and reliable ATS.

SUMMARY OF THE INVENTION

In order to solve one or more defects in the prior art, according to one aspect of the present disclosure, a moving contact pressure maintaining structure is proposed, the moving contact pressure maintaining structure acts on the moving contacts of the dual power transfer switch.

The movable contact pressure holding structure includes at least one pair of spring retainers and at least one pair of springs.

Corresponding two spring retainers of the at least one pair of spring retainers are staggered together with respect to each other.

The two spring retainers are arranged to respectively mount two springs of the at least one pair of springs between the two spring retainers in a parallel manner.

The movable contact is held between the two spring holders and between the two springs.

Through the parallel connection of springs, the installation space is small and compact, and multiple moving contacts can be installed side by side and their contact pressures are independent of each other, which greatly improves the rated current capacity and short-time withstand performance of the ATS. .

According to the above aspect of the present disclosure, the at least one pair of spring retainers includes a first spring retainer and a second spring retainer having the same structure and the same size.

The at least one pair of springs includes a first spring and a second spring.

According to various aspects of the present disclosure described above, the first spring retainer includes a first base, a first L-shaped flange, and a first U-shaped portion.

The first L-shaped flange and the first U-shaped portion are located at and extend from both ends of the first base, respectively.

The first base defines an elongated first through hole therein.

According to the above aspects of the present disclosure, the first base is provided with a first stepped portion on a side thereof close to the first L-shaped flange.

The first base is provided with a first slot on its side adjacent to the first U-shaped portion.

The first slot is between the first U-shaped portion and the first base.

According to various aspects of the present disclosure described above, the second spring retainer includes a second base, a second L-shaped flange, and a second U-shaped portion.

The second L-shaped flange and the second U-shaped portion are located at two ends of the second base, respectively, and extend from the two ends, respectively.

The second base defines an elongated second through hole therein.

According to the above aspects of the present disclosure, the second base portion is provided with a second stepped portion on a side thereof close to the second L-shaped flange.

The second base is provided with a second slot on its side adjacent to the second U-shaped portion.

The second slot is between the second U-shaped portion and the second base.

According to the above aspects of the present disclosure, when the first spring retainer and the second spring retainer are staggered together with respect to each other, the first step portion and the second step portion can be relative to each other. slidingly in contact with each other, the second L-shaped flange is in the first through hole, the first L-shaped flange is in the second through hole, the opening of the first U-shaped portion Towards the second base, the opening of the second U-shaped portion faces the first base.

According to the above aspects of the present disclosure, one of the ends of the first spring abuts on the first spring retainer.

The other end of the first spring abuts on the second L-shaped flange and is guided by the second L-shaped flange.

One end of the second spring abuts on the second spring holder.

The other end of the second spring abuts on the first L-shaped flange and is guided by the first L-shaped flange.

According to the above aspects of the present disclosure, the movable contact can pass through the first through hole and the second through hole and be mounted on the first L-shaped flange and the second L-shaped flange between the edges.

When the moving contact is in a non-stressed state, the width of the moving contact is equal to the distance between the first L-shaped flange and the second L-shaped flange, and the moving contact is relatively The first L-shaped flange and the second L-shaped flange cannot swing freely.

In accordance with the above aspects of the present disclosure, the edge of the first slot retains the first spring along the length of the first spring.

The edge of the second slot retains the second spring along the length of the second spring.

According to the above aspects of the present disclosure, the first spring is between the first U-shaped portion and the first base.

The second spring is between the second U-shaped portion and the second base.

Each slot set on each spring retainer increases the inner cavity space of each spring retainer, reduces the total width W of the spring retainer, and saves installation space. At the same time, the inner cavity space can limit the position of each spring, so as to avoid the falling off of each spring.

According to another aspect of the present disclosure, a moving contact assembly is provided, wherein the moving contact assembly includes at least one moving contact, at least one moving contact pressure maintaining structure as described above, and a moving contact support.

The moving contact pressure holding structure holds the moving contact therein.

The movable contact pressure maintaining structure is arranged in the movable contact support.

According to the above-mentioned another aspect of the present disclosure, the movable contact is mounted on the movable contact bracket through a pin shaft.

A bracket slot is provided below the movable contact bracket, and the width of the bracket slot is larger than the width of the movable contact, so that the movable contact can be slotted in the bracket around the pin shaft Swing in.

According to the above-mentioned another aspect of the present disclosure, the first spring retainer of the moving contact pressure holding structure abuts the moving contact bracket at its end near the first U-shaped portion.

The second spring holder of the moving contact pressure holding structure abuts the moving contact bracket at its end near the second U-shaped portion.

According to the above-mentioned another aspect of the present disclosure, the moving contact assembly further includes a limiting member.

The limiting member is provided with a buckle.

The movable contact bracket is provided with a slot.

Through the cooperation between the snap and the slot, the limiting member is installed on the movable contact bracket and will not fall off from the movable contact bracket; and the limiting member is installed across the on the first spring holder and the second spring holder, so that the first spring holder and the second spring holder will not fall off from the movable contact bracket.

According to the present disclosure, the first spring retainer and the second spring retainer are staggeredly installed in the movable contact bracket and limited by the movable contact bracket. One end of the first spring abuts on the first spring holder, and the other end of the first spring abuts on the second L-shaped flange and is supported by the second L-shaped flange guide. One end of the second spring abuts on the second spring holder, and the other end of the second spring abuts on the first L-shaped flange and is formed by the first L-shaped flange guide. The movable contact is installed between the first L-shaped flange and the second L-shaped flange. When the movable contact moves in one direction (for example, to the left), the movable contact pushes the second spring holder to move left (displacement is the same), and the first spring holder does not move due to the limitation of the movable contact holder, Then the second spring holder can push the first spring and the second spring to compress at the same time, and the compression amount of the two springs is the same as the displacement of the second spring holder. At this time, the restoring force of the movable contact (when in contact with the static contact, that is, the contact pressure) is simultaneously provided by two springs, that is, the effect of doubling the spring force value is realized by connecting the springs in parallel.

The pressure of the moving contact is provided by the combined force of the two springs. The stroke of each spring is the same as the stroke of the moving contact. The parallel spring can treat the two springs as a whole, which is equivalent to arranging a force value in a narrow space. larger spring.

The technical solution according to the present disclosure has the following advantages:

1. Small installation space

The contact pressure is provided by multiple springs in parallel, so that the spring with a smaller force value can achieve a larger contact pressure. When the spring force value is required to be smaller, the volume of the spring can also be smaller, saving installation space.

2. The two-way contact pressure is consistent

Even if the force values of the two springs are different, when the moving contact moves to the left/right, the contact pressure is still the same, and the pressure on the left and right of the moving contact will not be different due to the deviation of the spring force value.

3. Reduce the number of parts

The traditional contact pressure springs act independently on the left and right, that is, the left spring provides the contact pressure to the left, and the right spring provides the contact pressure to the right. Provided, which makes this solution save half the number of springs compared to the traditional solution.

According to yet another aspect of the present disclosure, a dual power transfer switch is provided, wherein the dual power transfer switch includes the moving contact pressure maintaining structure as described above.

Thus far, the present disclosure has outlined rather broadly the contents of the present disclosure in order that the detailed description herein may be better understood, and that the contribution of the present disclosure to the prior art may be better appreciated. . Of course, embodiments of the present disclosure will be described below and will form the subject of the appended claims.

Likewise, those skilled in the art will appreciate that the conception upon which this disclosure is based may readily be utilized as a basis for the designing of other structures, methods and systems for carrying out the several purposes of the present disclosure. Therefore, it is important that the appended claims be construed to include such equivalent structures as they do not depart from the spirit and scope of the present disclosure.

Description of drawings

Those skilled in the art will have a better understanding of the present disclosure, and the advantages of the present disclosure will be more clearly demonstrated by the following drawings. The drawings described herein are for illustrative purposes only of selected embodiments, not all possible implementations, and are not intended to limit the scope of the present disclosure.

1 shows a schematic plan view of a moving contact assembly having a moving contact pressure retaining structure according to the present disclosure;

FIG. 2 shows that the movable contact of the movable contact assembly is in contact with the first stationary contact corresponding to the first power source;

3 shows a perspective view of the first spring retainer of the moving contact pressure retaining structure according to the present disclosure;

FIG. 4 shows a perspective view of the second spring retainer of the moving contact pressure retaining structure according to the present disclosure;

5 shows an assembly view of a moving contact pressure retaining structure according to the present disclosure;

6 shows a cross-sectional view of a moving contact pressure maintaining structure according to the present disclosure;

FIG. 7 shows the movement state of the moving contact pressure retaining structure under the force of the left arrow according to the present disclosure;

FIGS. 8 and 9 illustrate the mating positional relationship of the first slot of the first spring retainer and the second slot of the second spring retainer with the first spring and the second spring, respectively, according to the present disclosure;

10(a)-(c) schematically illustrate the movement states of the movable contact pressure retaining structure of the present disclosure under the force of the left arrow and the force of the right arrow;

11 shows an assembly view of a moving contact, a first spring retainer, a second spring retainer, a first spring and a second spring according to the present disclosure;

12 shows a cross-sectional view of a moving contact assembly in accordance with the present disclosure with one moving contact installed;

Figure 13 shows a perspective view of a moving contact assembly according to the present disclosure with a plurality of moving contacts (three) mounted.

Detailed ways

Specific embodiments according to the present disclosure will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a schematic plan view of a moving contact assembly 2 having a moving contact pressure retaining structure 1 according to the present disclosure, wherein the moving contacts 3 of the moving contact assembly 2 are in a bifurcated position. FIG. 2 shows that the movable contact 3 of the movable contact assembly 2 is in contact and closed with the first stationary contact 4 corresponding to the first power source (not shown). 1 and 2 also show the second stationary contact 5 corresponding to the second power source (not shown). With the rotation of the movable contact assembly 2, the movable contact 3 can be in contact with the second stationary contact 5. closure.

According to an embodiment of the present disclosure, a moving contact pressure maintaining structure 1 is provided, and the moving contact pressure maintaining structure 1 acts on the moving contact 3 of the dual power transfer switch.

The moving contact pressure holding structure 1 includes at least one pair of spring holders and at least one pair of springs.

Corresponding two spring retainers of the at least one pair of spring retainers are staggered together with respect to each other.

The two spring retainers are arranged to respectively mount two springs of the at least one pair of springs between the two spring retainers in a parallel manner.

The movable contact 3 is held between the two spring holders and between the two springs.

The parallel connection of springs makes the installation space small and compact, and multiple moving contacts can be installed side by side and their contact pressures are independent of each other, which greatly improves the rated current capacity and short-time withstand performance of the ATS. .

According to the above-described embodiment of the present disclosure, the at least one pair of spring retainers includes a first spring retainer 6 ( FIG. 3 ) and a second spring retainer 7 ( FIG. 4 ) having the same structure and the same size.

As shown in FIG. 5 , the at least one pair of springs includes a first spring 8 and a second spring 9 .

According to the above-mentioned various embodiments of the present disclosure, as shown in FIG. 3 , the first spring retainer 6 includes a first base portion 6-1, a first L-shaped flange 6-2 and a first U-shaped portion 6-3 .

The first L-shaped flange 6-2 and the first U-shaped portion 6-3 are respectively located at two ends of the first base portion 6-1 and extend from the two ends, respectively.

The first base portion 6-1 defines an elongated first through hole 6-1-1 therein.

According to the above-mentioned respective embodiments of the present disclosure, the first base portion 6-1 is provided with a first stepped portion 6-1-2 on a side thereof close to the first L-shaped flange 6-2.

The first base 6-1 is provided with a first slot 6-1-3 on its side close to the first U-shaped portion 6-3.

The first slot 6-1-3 is between the first U-shaped portion 6-3 and the first base 6-1.

According to the above-mentioned various embodiments of the present disclosure, as shown in FIG. 4 , the second spring retainer 7 includes a second base portion 7-1, a second L-shaped flange 7-2 and a second U-shaped portion 7-3 .

The second L-shaped flange 7-2 and the second U-shaped portion 7-3 are located at and extend from both ends of the second base 7-1, respectively.

The second base 7-1 defines an elongated second through hole 7-1-1 therein.

According to the above-mentioned various embodiments of the present disclosure, the second base portion 7-1 is provided with a second stepped portion 7-1-2 on its side close to the second L-shaped flange 7-2.

The second base 7-1 is provided with a second slot 7-1-3 on its side close to the second U-shaped portion 7-3.

The second slot 7-1-3 is between the second U-shaped portion 7-3 and the second base 7-1.

According to the above-mentioned various embodiments of the present disclosure, as shown in FIGS. 5 and 6 , when the first spring retainer 6 and the second spring retainer 7 are staggeredly installed with respect to each other, the first The stepped portion 6-1-2 and the second stepped portion 7-1-2 can be in sliding contact with each other, and the second L-shaped flange 7-2 is located in the first through hole 6-1 In -1, the first L-shaped flange 6-2 is in the second through hole 7-1-1, and the opening of the first U-shaped portion 6-3 faces the second base 7-1 , the opening of the second U-shaped portion 7-3 faces the first base portion 6-1.

According to the above-mentioned various embodiments of the present disclosure, one end of the first spring 8 abuts on the first spring holder 6 .

The other end of the first spring 8 abuts on the second L-shaped flange 7-2 and is guided by the second L-shaped flange 7-2.

One end of the second spring 9 abuts on the second spring holder 7 .

The other end of the second spring 9 abuts on the first L-shaped flange 6-2 and is guided by the first L-shaped flange 6-2.

According to the above-mentioned various embodiments of the present disclosure, as shown in FIG. 11 , the movable contact 3 can pass through the first through hole 6-1-1 and the second through hole 7-1-1 and be Installed between the first L-shaped flange 6-2 and the second L-shaped flange 7-2.

When the movable contact 3 is in a non-stressed state, the width of the movable contact 3 is equal to the distance between the first L-shaped flange 6-2 and the second L-shaped flange 7-2 , the movable contact 3 cannot swing freely relative to the first L-shaped flange 6-2 and the second L-shaped flange 7-2.

According to the various embodiments of the present disclosure described above, as shown in FIGS. 8 and 9 , the edge of the first slot 6 - 1 - 3 holds the first spring 8 along the length of the first spring 8 . .

The edge of the second slot 7-1-3 holds the second spring 9 along its length.

According to the various embodiments of the present disclosure described above, the first spring 8 is located between the first U-shaped portion 6-3 and the first base portion 6-1.

The second spring 9 is located between the second U-shaped portion 7-3 and the second base 7-1.

Each slot set on each spring retainer increases the inner cavity space of each spring retainer, reduces the total width W of the spring retainer, and saves installation space. At the same time, the inner cavity space can limit the position of each spring, so as to avoid the falling off of each spring.

According to another embodiment of the present disclosure, a moving contact assembly is provided. As shown in FIG. 11 to FIG. 13 , the moving contact assembly 2 includes at least one moving contact 3 , and at least one moving contact as described above. The pressure holding structure 1 and the movable contact bracket 10 .

The moving contact pressure holding structure 1 holds the moving contact 3 therein.

The moving contact pressure maintaining structure 1 is arranged in the moving contact support 10 .

According to the above-mentioned another embodiment of the present disclosure, as shown in FIG. 12 , the movable contact 3 is mounted on the movable contact bracket 10 through the pin shaft 11 .

A bracket slot 10 - 1 is provided below the movable contact bracket 10 , and the bracket slot 10 - 1 is wider than the movable contact 3 , so that the movable contact 3 can surround the movable contact 3 . The pin shaft 11 swings at a certain angle in the bracket slot 10-1.

According to the above-mentioned another embodiment of the present disclosure, the first spring holder 6 of the moving contact pressure holding structure 1 abuts the The moving contact bracket 10 .

The second spring holder 7 of the moving contact pressure holding structure 1 abuts the moving contact bracket 10 at its end close to the second U-shaped portion 7-3.

According to the above-mentioned another embodiment of the present disclosure, as shown in FIG. 13 , the movable contact assembly 2 further includes a limiting member 12 .

The limiting member 12 is provided with a buckle 12-1.

The movable contact bracket 10 is provided with a slot 10-2.

Through the cooperation of the clip 12-1 and the clip slot 10-2, the limiting member 12 is installed on the movable contact bracket 10 and will not fall off from the movable contact bracket 10, and all The limiting member 12 is installed across the first spring holder 6 and the second spring holder 7, so that the first spring holder 6 and the second spring holder 7 do not from the movable contact bracket 10 .

As shown in Figure 13, on the ATS four-pole product (not shown), each phase is equipped with three moving contacts 3 (such as but not limited to this), which can achieve higher rated current performance and Short-term endurance performance.

According to the present disclosure, as schematically shown in FIG. 10( a ), the first spring holder 6 and the second spring holder 7 are staggeredly installed in the movable contact bracket 10 and are limited by the movable contact bracket 10 bit. One end of the first spring 8 abuts on the first spring holder 6, and the other end of the first spring 8 abuts on the second L-shaped flange 7-2 and is held by the The second L-shaped flange 7-2 guides. One end of the second spring 9 abuts on the second spring holder 7, and the other end of the second spring 9 abuts on the first L-shaped flange 6-2 and is supported by the The first L-shaped flange 6-2 guides. The movable contact 3 is installed between the first L-shaped flange 6-2 and the second L-shaped flange 7-2.

When the movable contact 3 moves in one direction (for example, to the left, as shown in Fig. 7 and Fig. 10(b)), the movable contact 3 pushes the second spring holder 7 to move left (with the same displacement). The limit of the contact bracket 10 makes the first spring holder 6 not move, then the second spring holder 7 can push the first spring 8 and the second spring 9 to compress at the same time, and the compression amount of the two springs is the same as that of the second spring holder The displacement of 7 is the same. At this time, the reset force of the movable contact 3 (when in contact with the static contact, that is, the contact pressure) is simultaneously provided by two springs, that is, the spring force value is doubled by connecting the springs in parallel.

When the movable contact 3 moves in one direction (for example, to the right, as shown in Fig. 10(c)), the movable contact 3 pushes the first spring holder 6 to move to the right (with the same displacement), because the movable contact support The limit of 10 makes the second spring holder 7 not move, then the first spring holder 6 can push the first spring 8 and the second spring 9 to compress at the same time, and the compression amount of the two springs is the same as the displacement of the first spring holder 6 same. At this time, the reset force of the movable contact 3 (when in contact with the static contact, that is, the contact pressure) is simultaneously provided by two springs, that is, the spring force value is doubled by connecting the springs in parallel.

The pressure of the moving contact 3 is provided by the combined force of the two springs. The stroke of each spring is the same as the stroke of the moving contact 3. The parallel spring can treat the two springs as a whole, which is equivalent to arranging one spring in a narrow space. A spring with a higher force value.

According to yet another embodiment of the present disclosure, a dual power transfer switch (not shown) is proposed, wherein the dual power transfer switch includes the moving contact pressure maintaining structure 1 as described above.

The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the embodiments to the precise form disclosed. Modifications and changes may be made in light of the above disclosure or may be obtained from practice of the embodiments.

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. Indeed, many of these features may be combined in ways not specifically recited in the claims and/or disclosed in the specification. Although each dependent claim listed below may depend directly on only one claim, the disclosure of various embodiments includes each dependent claim in combination with every other claim in the set of claims.

No element, act, or instruction used herein should be construed as critical or essential unless explicitly stated otherwise. Also, 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." Also, as used herein, the article "the" is intended to include the item or items referenced in conjunction with the article "the" and is used interchangeably with "one or more." Also, as used herein, the term "set" is intended to include one or more items (eg, related items, unrelated items, a combination of related and unrelated items, etc.), and can be used interchangeably with "one or more." Where only one item is intended, the phrase "only one item" or similar language is used. Also, as used herein, the term "having" and variations thereof, and the like, are intended to be open-ended terms. Furthermore, the phrase "based on" is intended to mean "based at least in part on" unless expressly stated otherwise. Also, as used herein, the term "or" when used in tandem is intended to be inclusive and can be used interchangeably with "and/or" unless expressly stated otherwise (eg, if used in conjunction with "or" or "only" one of" is used in combination).

Claims (16)

1. A moving contact pressure holding structure acting on a moving contact of a dual power switch, wherein, The movable contact pressure holding structure includes at least one pair of spring retainers and at least one pair of springs; Corresponding two spring retainers in the at least one pair of spring retainers are staggered and mounted together relative to each other; the two spring retainers are arranged to respectively install two springs of the at least one pair of springs between the two spring retainers in a parallel manner; The movable contact is held between the two spring holders and between the two springs. 2. The moving contact pressure maintaining structure according to claim 1, wherein the at least one pair of spring retainers includes a first spring retainer and a second spring retainer having the same structure and the same size; The at least one pair of springs includes a first spring and a second spring. 3. The moving contact pressure maintaining structure according to claim 2, wherein the first spring retainer includes a first base, a first L-shaped flange and a first U-shaped portion; the first L-shaped flange and the first U-shaped portion are respectively located at two ends of the first base and extend from the two ends, respectively; The first base defines an elongated first through hole therein. 4. The moving contact pressure maintaining structure according to claim 3, wherein The first base is provided with a first step on one side of the first base that is close to the first L-shaped flange; the first base is provided with a first slot on its side close to the first U-shaped portion; The first slot is between the first U-shaped portion and the first base. 5. The moving contact pressure maintaining structure according to claim 4, wherein the second spring retainer includes a second base, a second L-shaped flange and a second U-shaped portion; the second L-shaped flange and the second U-shaped portion are respectively located at two ends of the second base and extend from the two ends, respectively; The second base defines an elongated second through hole therein. 6. The moving contact pressure maintaining structure according to claim 5, wherein The second base is provided with a second step on its side close to the second L-shaped flange; the second base is provided with a second slot on its side close to the second U-shaped portion; The second slot is between the second U-shaped portion and the second base. 7. The moving contact pressure maintaining structure according to claim 6, wherein When the first spring retainer and the second spring retainer are staggeredly installed relative to each other, the first step portion and the second step portion can be slidably contacted together relative to each other, the The second L-shaped flange is in the first through hole, the first L-shaped flange is in the second through hole, the opening of the first U-shaped portion faces the second base, the The opening of the second U-shaped portion faces the first base. 8. The moving contact pressure maintaining structure according to claim 7, wherein One end of the first spring abuts on the first spring holder; The other end of the first spring abuts on the second L-shaped flange and is guided by the second L-shaped flange; One end of the second spring abuts on the second spring holder; The other end of the second spring abuts on the first L-shaped flange and is guided by the first L-shaped flange. 9. The moving contact pressure maintaining structure according to claim 8, wherein The movable contact can pass through the first through hole and the second through hole and be installed between the first L-shaped flange and the second L-shaped flange; When the moving contact is in a non-stressed state, the width of the moving contact is equal to the distance between the first L-shaped flange and the second L-shaped flange, and the moving contact is relatively The first L-shaped flange and the second L-shaped flange cannot swing freely. 10. The moving contact pressure maintaining structure according to claim 7, wherein the edge of the first slot retains the first spring along the length of the first spring; The edge of the second slot retains the second spring along the length of the second spring. 11. The moving contact pressure maintaining structure according to claim 10, wherein the first spring is between the first U-shaped portion and the first base; The second spring is between the second U-shaped portion and the second base. 12. A moving contact assembly, wherein The moving contact assembly includes at least one moving contact, at least one moving contact pressure maintaining structure according to one of claims 1 to 11, and a moving contact support; the movable contact pressure retaining structure retains the movable contact therein; The movable contact pressure maintaining structure is arranged in the movable contact support. 13. The moving contact assembly of claim 12, wherein The movable contact is mounted on the movable contact bracket through a pin shaft; A bracket slot is provided below the movable contact bracket, and the width of the bracket slot is larger than the width of the movable contact, so that the movable contact can be slotted in the bracket around the pin shaft Swing in. 14. The moving contact assembly of claim 13, wherein the first spring holder of the moving contact pressure holding structure abuts the moving contact bracket at its end close to the first U-shaped portion; The second spring holder of the moving contact pressure holding structure abuts the moving contact bracket at its end near the second U-shaped portion. 15. The moving contact assembly of claim 14, wherein The moving contact assembly further includes a limiter; The limiting member is provided with a buckle; The movable contact bracket is provided with a slot; Through the cooperation of the clip and the slot, the limiting member is installed on the movable contact bracket and will not fall off from the movable contact bracket; and The stopper is installed to straddle the first spring retainer and the second spring retainer, so that the first spring retainer and the second spring retainer are not moved from the movement. The contact holder comes off. 16. A dual power transfer switch, wherein the dual power transfer switch comprises the movable contact pressure maintaining structure as claimed in one of claims 1 to 11.

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