Moving contact pressure holding structure, moving contact assembly and dual power conversion switch

Abstract

A moving contact pressure retaining structure, the moving contact pressure retaining structure acts on the moving contact of a dual power conversion switch, wherein the moving contact pressure retaining structure includes at least one pair of spring retainers and at least one pair of springs; two corresponding spring retainers in the at least one pair of spring retainers are staggered relative to each other; the two spring retainers are configured to respectively install two springs in the at least one pair of springs in parallel between the two spring retainers; the moving contact is retained between the two spring retainers and is located between the two springs. A moving contact assembly, comprising the moving contact pressure retaining structure as described above. A dual power conversion switch, comprising the moving contact pressure retaining structure as described above.

Description

Technical Field

[0001] The present disclosure relates to a moving contact pressure retaining structure, and in particular to a moving contact pressure retaining structure for a dual power transfer switch (ATS). The present disclosure also relates to a moving contact assembly, which includes the moving contact pressure retaining structure as described above. The present disclosure further relates to a dual power transfer switch, which includes the moving contact pressure retaining structure as described above. Background Art

[0002] The moving contact of the dual power transfer switch (ATS) has a bidirectional contact, so that it can contact the first static contact of the first power supply and the second static contact of the second power supply. The moving contact pressure holding mechanism currently used generally includes two independent elastic member devices for the two contacts, which results in a large space occupation and the problem of unstable contact pressure. In particular, when the contact surface (silver point) of the moving and static contacts becomes thinner due to ablation (i.e., the overtravel becomes smaller), the change of contact pressure is often relatively large, which affects the mechanical and electrical properties of the dual power transfer switch.

[0003] In order to improve the rated current carrying capacity and short-time withstand current performance of 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 different. This requires that the contact pressure of each moving contact is independent of each other to ensure that the electrical performance of each moving contact and static contact is basically consistent, thereby obtaining a more stable and reliable ATS. Summary of the invention

[0004] In order to solve one or more defects in the prior art, according to one aspect of the present disclosure, a moving contact pressure holding structure is proposed, wherein the moving contact pressure holding structure acts on a moving contact of a dual power conversion switch.

[0005] The moving contact pressure holding structure includes at least one pair of spring holders and at least one pair of springs.

[0006] The corresponding two spring retainers in the at least one pair of spring retainers are staggeredly installed relative to each other.

[0007] The two spring retainers are configured to respectively mount the two springs of the at least one pair of springs in parallel between the two spring retainers.

[0008] The moving contact is held between the two spring holders and is located between the two springs.

[0009] The parallel connection of springs makes the installation space small and compact, and multiple moving contacts can be installed side by side with their contact pressures being independent of each other, which greatly improves the rated current carrying capacity and short-time withstand performance of the ATS.

[0010] 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.

[0011] The at least one pair of springs includes a first spring and a second spring.

[0012] According to the above aspects of the present disclosure, the first spring retainer includes a first base, a first L-shaped flange, and a first U-shaped portion.

[0013] 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.

[0014] The first base defines an elongated first through hole therein.

[0015] According to the above aspects of the present disclosure, the first base is provided with a first step portion on a side thereof close to the first L-shaped flange.

[0016] The first base is provided with a first slot on a side thereof close to the first U-shaped portion.

[0017] The first slot is between the first U-shaped portion and the first base.

[0018] According to the above aspects of the present disclosure, the second spring retainer includes a second base, a second L-shaped flange, and a second U-shaped portion.

[0019] 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.

[0020] The second base defines an elongated second through hole therein.

[0021] According to the above aspects of the present disclosure, the second base is provided with a second step portion on a side thereof close to the second L-shaped flange.

[0022] The second base is provided with a second slot on one side thereof close to the second U-shaped portion.

[0023] The second slot is between the second U-shaped portion and the second base.

[0024] According to the above-mentioned various aspects of the present disclosure, 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 relative to 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 faces the second base, and the opening of the second U-shaped portion faces the first base.

[0025] According to the above aspects of the present disclosure, one end of the first spring abuts against the first spring retainer.

[0026] The other end of the first spring abuts against the second L-shaped flange and is guided by the second L-shaped flange.

[0027] One end of the second spring abuts against the second spring retainer.

[0028] The other end of the second spring abuts against the first L-shaped flange and is guided by the first L-shaped flange.

[0029] According to the above aspects of the present disclosure, the moving 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.

[0030] 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 cannot swing freely relative to the first L-shaped flange and the second L-shaped flange.

[0031] According to the above aspects of the present disclosure, the edge of the first slot retains the first spring along the length of the first spring.

[0032] The second slotted edge retains the second spring along the length of the second spring.

[0033] According to the above aspects of the present disclosure, the first spring is between the first U-shaped portion and the first base.

[0034] The second spring is between the second U-shaped portion and the second base.

[0035] The slots provided on the spring retainers increase the inner cavity space of the spring retainers, thereby reducing the total width W of the spring retainers and saving installation space. At the same time, the inner cavity space can limit the positions of the springs, thereby preventing the springs from falling off.

[0036] 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 retaining structure as described above, and a moving contact support.

[0037] The moving contact pressure retaining structure retains the moving contact therein.

[0038] The moving contact pressure maintaining structure is arranged in the moving contact support.

[0039] According to the above another aspect of the present disclosure, the moving contact is mounted on the moving contact support via a pin shaft.

[0040] A bracket slot is provided below the moving contact bracket, and the width of the bracket slot is greater than the width of the moving contact, so that the moving contact can swing around the pin shaft in the bracket slot.

[0041] According to the above another aspect of the present disclosure, the first spring retainer of the moving contact pressure retaining structure abuts against the moving contact support at its end close to the first U-shaped portion.

[0042] The second spring retainer of the moving contact pressure retaining structure abuts against the moving contact support at its end close to the second U-shaped portion.

[0043] According to the above another aspect of the present disclosure, the moving contact assembly further includes a limiting member.

[0044] The limiting component is provided with a buckle.

[0045] The moving contact bracket is provided with a clamping slot.

[0046] The cooperation of the buckle and the slot enables the limiter to be installed on the moving contact bracket and not fall off the moving contact bracket; and the limiter is installed to span the first spring retainer and the second spring retainer, so that the first spring retainer and the second spring retainer will not fall off the moving contact bracket.

[0047] According to the present disclosure, the first spring holder and the second spring holder are staggeredly installed in the moving contact bracket and limited by the moving 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 guided by the second L-shaped flange. 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 guided by the first L-shaped flange. The moving contact is installed between the first L-shaped flange and the second L-shaped flange. When the moving contact moves in one direction (for example, to the left), the moving contact pushes the second spring holder to move left (the displacement is the same). Since the limiting of the moving contact bracket makes the first spring holder immobile, the second spring holder can simultaneously push the first spring and the second spring to compress, and the compression of the two springs is the same as the displacement of the second spring holder. At this time, the reset force of the moving contact (when in contact with the static contact, that is, the contact pressure) is provided by the two springs at the same time, that is, the effect of doubling the spring force value is achieved by connecting the springs in parallel.

[0048] The pressure of the moving contact is provided by the combined force of two springs. The stroke of each spring is consistent with the stroke of the moving contact. The parallel spring can regard the two springs as a whole, which is equivalent to arranging a spring with a larger force value in a narrow space.

[0049] The technical solution according to the present disclosure has the following advantages:

[0050] 1. Small installation space

[0051] The contact pressure is provided by multiple springs connected in parallel, so that a spring with a smaller force value can achieve a larger contact pressure. When the spring force value requirement is smaller, the volume of the spring can also be smaller, saving installation space.

[0052] 2. The contact pressure in both directions is consistent

[0053] Even if the two spring force values ​​are different, when the moving contact moves to the left / right, the contact pressure remains the same, and the deviation in the spring force value does not cause different pressures on the left and right of the moving contact.

[0054] 3. Reduced number of parts

[0055] The traditional contact pressure spring acts independently on the left and right sides, that is, the left spring provides contact pressure to the left, and the right spring provides contact pressure to the right. The contact pressure of this solution is provided by the springs on both sides at the same time, which saves half the number of springs compared to the traditional solution.

[0056] According to yet another aspect of the present disclosure, a dual power transfer switch is provided, wherein the dual power transfer switch includes the movable contact pressure maintaining structure as described above.

[0057] At this point, in order that the detailed description of the present disclosure herein can be better understood, and in order that the contribution of the present disclosure to the prior art can be better appreciated, the present disclosure has been fairly broadly outlined. Of course, embodiments of the present disclosure will be described below and will form the subject matter of the appended claims.

[0058] Likewise, those skilled in the art will recognize that the conception upon which the present disclosure is based can be easily used as the basis for designing other structures, methods and systems for implementing the several purposes of the present disclosure. Therefore, it is important that the appended claims should be considered to include such equivalent structures as long as they do not exceed the essence and scope of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] The following drawings will provide a better understanding of the present disclosure and more clearly demonstrate the advantages of the present disclosure. 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.

[0060] Figure 1 A schematic plan view showing a moving contact assembly having a moving contact pressure retaining structure according to the present disclosure;

[0061] Figure 2 The moving contact of the moving contact assembly is shown to be in contact and closed with the first stationary contact corresponding to the first power source;

[0062] Figure 3 A perspective view showing a first spring retainer of the moving contact pressure retaining structure according to the present disclosure;

[0063] Figure 4 A perspective view showing a second spring retainer of the moving contact pressure retaining structure according to the present disclosure;

[0064] Figure 5 An assembly diagram showing a moving contact pressure maintaining structure according to the present disclosure;

[0065] Figure 6 A cross-sectional view showing a moving contact pressure maintaining structure according to the present disclosure;

[0066] Figure 7 The moving state of the moving contact pressure holding structure according to the present disclosure under the force of the left arrow is shown;

[0067] Figure 8 and Fig. 9The first slot of the first spring retainer and the second slot of the second spring retainer according to the present disclosure are shown in relation to the matching positions of the first spring and the second spring respectively;

[0068] Fig.10 (a)-(c) schematically illustrate the motion state of the moving contact pressure maintaining structure of the present disclosure under the force of the left arrow and the force of the right arrow;

[0069] Fig.11 An assembly diagram showing a moving contact, a first spring retainer, a second spring retainer, a first spring, and a second spring according to the present disclosure;

[0070] Fig.12 A cross-sectional view showing a moving contact assembly according to the present disclosure with one moving contact installed;

[0071] Fig.13 A perspective view showing a moving contact assembly according to the present disclosure on which a plurality of moving contacts (three) are installed. DETAILED DESCRIPTION

[0072] The specific implementation methods according to the present disclosure are described in detail below in conjunction with the accompanying drawings.

[0073] Figure 1 A schematic plan view of a moving contact assembly 2 having a moving contact pressure maintaining structure 1 according to the present disclosure is shown, wherein the moving contact 3 of the moving contact assembly 2 is in a double-open position. Figure 2 The moving contact 3 of the moving contact assembly 2 is shown to be in contact with the first stationary contact 4 corresponding to the first power source (not shown). Figure 1 and Figure 2 A second stationary contact 5 corresponding to a second power source (not shown) is also shown. As the moving contact assembly 2 rotates, the moving contact 3 can contact and close with the second stationary contact 5 .

[0074] According to an embodiment of the present disclosure, a moving contact pressure maintaining structure 1 is provided, wherein the moving contact pressure maintaining structure 1 acts on a moving contact 3 of a dual power conversion switch.

[0075] The moving contact pressure maintaining structure 1 includes at least one pair of spring retainers and at least one pair of springs.

[0076] The corresponding two spring retainers in the at least one pair of spring retainers are staggeredly installed relative to each other.

[0077] The two spring retainers are configured to respectively mount the two springs of the at least one pair of springs in parallel between the two spring retainers.

[0078] The moving contact 3 is held between the two spring holders and is located between the two springs.

[0079] The parallel connection of springs makes the installation space small and compact, and multiple moving contacts can be installed side by side with their contact pressures being independent of each other, which greatly improves the rated current carrying capacity and short-time withstand performance of the ATS.

[0080] According to the above embodiment of the present disclosure, the at least one pair of spring retainers comprises a first spring retainer 6 (such as Figure 3 ) and the second spring retainer 7 (such as Figure 4 ).

[0081] like Figure 5 As shown, the at least one pair of springs includes a first spring 8 and a second spring 9 .

[0082] According to the above-mentioned various embodiments of the present disclosure, Figure 3 As shown, the first spring retainer 6 includes a first base 6-1, a first L-shaped flange 6-2 and a first U-shaped portion 6-3.

[0083] 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.

[0084] The first base portion 6 - 1 defines an elongated first through hole 6 - 1 - 1 therein.

[0085] According to the above-mentioned various embodiments of the present disclosure, the first base portion 6 - 1 is provided with a first step portion 6 - 1 - 2 on a side thereof close to the first L-shaped flange 6 - 2 .

[0086] The first base portion 6-1 is provided with a first slot 6-1-3 on one side thereof close to the first U-shaped portion 6-3.

[0087] The first slot 6-1-3 is located between the first U-shaped portion 6-3 and the first base 6-1.

[0088] According to the above-mentioned various embodiments of the present disclosure, Figure 4 As shown, the second spring retainer 7 includes a second base 7-1, a second L-shaped flange 7-2 and a second U-shaped portion 7-3.

[0089] The second L-shaped flange 7 - 2 and the second U-shaped portion 7 - 3 are respectively located at two ends of the second base portion 7 - 1 and extend from the two ends.

[0090] The second base portion 7-1 defines an elongated second through hole 7-1-1 therein.

[0091] According to the above-mentioned various embodiments of the present disclosure, the second base portion 7-1 is provided with a second step portion 7-1-2 on one side thereof close to the second L-shaped flange 7-2.

[0092] The second base portion 7-1 is provided with a second slot 7-1-3 on one side thereof close to the second U-shaped portion 7-3.

[0093] The second slot 7-1-3 is located between the second U-shaped portion 7-3 and the second base 7-1.

[0094] According to the above-mentioned various embodiments of the present disclosure, Figure 5 and Figure 6 As shown, when the first spring retainer 6 and the second spring retainer 7 are staggeredly installed relative to each other, the first step portion 6-1-2 and the second step portion 7-1-2 can slide in contact with each other, the second L-shaped flange 7-2 is in the first through hole 6-1-1, the first L-shaped flange 6-2 is in the second through hole 7-1-1, the opening of the first U-shaped portion 6-3 faces the second base 7-1, and the opening of the second U-shaped portion 7-3 faces the first base 6-1.

[0095] According to the above-mentioned various embodiments of the present disclosure, one end of the first spring 8 abuts against the first spring retainer 6 .

[0096] The other end of the first spring 8 abuts against the second L-shaped flange 7 - 2 and is guided by the second L-shaped flange 7 - 2 .

[0097] One end of the second spring 9 abuts against the second spring retainer 7 .

[0098] The other end of the second spring 9 abuts against the first L-shaped flange 6 - 2 and is guided by the first L-shaped flange 6 - 2 .

[0099] According to the above-mentioned various embodiments of the present disclosure, Fig.11 As shown, the moving 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.

[0100] When the moving contact 3 is in a non-stressed state, the width of the moving contact 3 is equal to the distance between the first L-shaped flange 6-2 and the second L-shaped flange 7-2, and the moving contact 3 cannot swing freely relative to the first L-shaped flange 6-2 and the second L-shaped flange 7-2.

[0101] According to the above-mentioned various embodiments of the present disclosure, Figure 8 and Fig. 9 As shown, the edge of the first slot 6 - 1 - 3 holds the first spring 8 along the length of the first spring 8 .

[0102] The edge of the second slot 7 - 1 - 3 holds the second spring 9 along the length of the second spring 9 .

[0103] According to the above-described various embodiments of the present disclosure, the first spring 8 is located between the first U-shaped portion 6 - 3 and the first base 6 - 1 .

[0104] The second spring 9 is located between the second U-shaped portion 7 - 3 and the second base 7 - 1 .

[0105] The slots provided on the spring retainers increase the inner cavity space of the spring retainers, thereby reducing the total width W of the spring retainers and saving installation space. At the same time, the inner cavity space can limit the positions of the springs, thereby preventing the springs from falling off.

[0106] According to another embodiment of the present disclosure, a moving contact assembly is provided, such as Figures 11 to 13 As shown, the moving contact assembly 2 includes at least one moving contact 3 , at least one moving contact pressure maintaining structure 1 as described above, and a moving contact support 10 .

[0107] The movable contact pressure retaining structure 1 retains the movable contact 3 therein.

[0108] The moving contact pressure maintaining structure 1 is disposed in the moving contact support 10 .

[0109] According to another embodiment of the present disclosure, Fig.12 As shown, the moving contact 3 is mounted on the moving contact support 10 via a pin shaft 11 .

[0110] A bracket slot 10 - 1 is provided below the moving contact bracket 10 , and the width of the bracket slot 10 - 1 is greater than the width of the moving contact 3 , so that the moving contact 3 can swing around the pin shaft 11 in the bracket slot 10 - 1 at a certain angle.

[0111] According to the above another embodiment of the present disclosure, the first spring retainer 6 of the moving contact pressure maintaining structure 1 abuts against the moving contact support 10 at its end close to the first U-shaped portion 6 - 3 .

[0112] The second spring retainer 7 of the moving contact pressure holding structure 1 abuts against the moving contact support 10 at its end close to the second U-shaped portion 7 - 3 .

[0113] According to another embodiment of the present disclosure, Fig.13 As shown, the moving contact assembly 2 further includes a limiting member 12 .

[0114] The limiting member 12 is provided with a buckle 12 - 1 .

[0115] The moving contact bracket 10 is provided with a slot 10 - 2 .

[0116] Through the cooperation of the buckle 12-1 and the slot 10-2, the limit member 12 is installed on the moving contact bracket 10 and will not fall off from the moving contact bracket 10, and the limit member 12 is installed to span the first spring retainer 6 and the second spring retainer 7, so that the first spring retainer 6 and the second spring retainer 7 will not fall off from the moving contact bracket 10.

[0117] like Fig.13 As shown, on the four-pole product of ATS (not shown), each phase is equipped with three moving contacts 3 (for example but not limited to this), which can achieve higher rated current performance and short-time withstand performance.

[0118] According to the present disclosure, Fig.10 (a) As shown schematically, the first spring retainer 6 and the second spring retainer 7 are staggeredly installed in the moving contact bracket 10 and are limited by the moving contact bracket 10. One end of the first spring 8 abuts on the first spring retainer 6, and 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 retainer 7, and 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. The moving contact 3 is installed between the first L-shaped flange 6-2 and the second L-shaped flange 7-2.

[0119] When the moving contact 3 moves in one direction (for example, to the left, Figure 7 and Fig.10 (b) shows that the moving contact 3 pushes the second spring holder 7 to move leftward (with the same displacement). Since the first spring holder 6 is immobile due to the limit of the moving contact bracket 10, the second spring holder 7 can simultaneously push the first spring 8 and the second spring 9 to be compressed, and the compression amount of the two springs is the same as the displacement of the second spring holder 7. At this time, the reset force of the moving contact 3 (when in contact with the static contact, it is the contact pressure) is provided by the two springs at the same time, that is, the effect of doubling the spring force value is achieved by connecting the springs in parallel.

[0120] When the moving contact 3 moves in one direction (for example, to the right, as Fig.10(c)), the moving contact 3 pushes the first spring holder 6 to move right (the displacement is the same), and since the second spring holder 7 is immobile due to the limit of the moving contact bracket 10, the first spring holder 6 can simultaneously push the first spring 8 and the second spring 9 to be compressed, and the compression amount of the two springs is the same as the displacement of the first spring holder 6. At this time, the reset force of the moving contact 3 (when in contact with the static contact, it is the contact pressure) is provided by the two springs at the same time, that is, the effect of doubling the spring force value is achieved by connecting the springs in parallel.

[0121] The pressure of the moving contact 3 is provided by the combined force of the two springs. The stroke of each spring is consistent with the stroke of the moving contact 3. The parallel spring can regard the two springs as a whole, which is equivalent to arranging a spring with a larger force value in a narrow space.

[0122] According to yet another embodiment of the present disclosure, a dual power transfer switch (not shown) is provided, wherein the dual power transfer switch includes the moving contact pressure maintaining structure 1 as described above.

[0123] The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the embodiments to the precise forms disclosed. Modifications and variations may be made in light of the above disclosure or may be acquired from practice of the embodiments.

[0124] Even though particular combinations of features are recited in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of the various embodiments. In fact, 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 only directly depend on one claim, the disclosure of the various embodiments includes each dependent claim in combination with every other claim in the claim set.

[0125] 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." In addition, as used herein, the article "the" is intended to include one or more items cited in conjunction with the article "the" and can be used interchangeably with "one or more." In addition, 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 can be used interchangeably with "one or more." In the case of only meaning Figure 1In the case of an item, the phrase "only one" or similar language is used. In addition, as used herein, the terms "having" and variations thereof, etc. are intended to be open-ended terms. In addition, the phrase "based on" is intended to mean "based, at least in part, on," unless expressly stated otherwise. In addition, as used herein, the term "or" is intended to be inclusive when used in series and can be used interchangeably with "and / or" unless expressly stated otherwise (e.g., if used in conjunction with "or" or "only one of").

Claims

1. A moving contact pressure holding structure, the moving contact pressure holding structure acts on the moving contact of a dual power conversion switch, wherein: The moving contact pressure holding structure comprises at least one pair of spring holders and at least one pair of springs; The corresponding two spring retainers in the at least one pair of spring retainers are staggeredly installed relative to each other; The two spring retainers are configured to mount two springs of the at least one pair of springs in parallel between the two spring retainers; The moving contact is held between the two spring holders and is located 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 portion on a side thereof close to the first L-shaped flange; The first base is provided with a first slot on one side thereof 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 portion on a side thereof close to the second L-shaped flange; The second base is provided with a second slot on one side thereof 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 installed alternately relative to each other, the first step portion and the second step portion can be slidably contacted relative to 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 faces the second base, and 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 against the first spring retainer; The other end of the first spring abuts against the second L-shaped flange and is guided by the second L-shaped flange; One end of the second spring abuts against the second spring retainer; The other end of the second spring abuts against 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 moving 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 cannot swing freely relative to the first L-shaped flange and the second L-shaped flange.

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 second slotted edge 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 comprises at least one moving contact, at least one moving contact pressure retaining structure according to any one of claims 1 to 11, and a moving contact support; The movable contact pressure retaining structure retains the movable contact therein; The moving contact pressure maintaining structure is arranged in the moving contact support.

13. The moving contact assembly according to claim 12, wherein The moving contact is mounted on the moving contact bracket via a pin shaft; A bracket slot is provided below the moving contact bracket, and the width of the bracket slot is greater than the width of the moving contact, so that the moving contact can swing around the pin shaft in the bracket slot.

14. The moving contact assembly according to claim 13, wherein The first spring retainer of the moving contact pressure holding structure abuts against the moving contact support at an end portion thereof close to the first U-shaped portion of the first spring retainer; The second spring retainer of the moving contact pressure retaining structure abuts against the moving contact support at its end close to the second U-shaped portion of the second spring retainer.

15. The moving contact assembly according to claim 14, wherein The moving contact assembly also includes a limiting member; The limiting member is provided with a buckle; The moving contact bracket is provided with a card slot; The stopper is mounted on the moving contact bracket and will not fall off from the moving contact bracket by the cooperation between the buckle and the slot; and The limiting member is installed to span the first spring retainer and the second spring retainer, so that the first spring retainer and the second spring retainer will not fall off the moving contact support.

16. A dual power conversion switch, wherein the dual power conversion switch comprises the moving contact pressure maintaining structure according to any one of claims 1 to 11.

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