CN220381988U - Rotary isolating switch and power supply system - Google Patents

Abstract

The utility model discloses a rotary isolating switch and a power supply system, which comprise an operation unit layer and at least two switch unit layers which are arranged in a stacked manner; the operation unit layer is used for driving the movable contact disc to rotate so as to realize the connection and disconnection of the isolating switch; at least one layer of switch unit layer is internally provided with a stop structure, the stop structure is arranged between the movable contact disc and the shell of the switch unit layer, the stop structure comprises a stop protrusion and two stop surfaces, and the stop protrusion and the stop surfaces are respectively arranged on the movable contact disc and the shell; the two stop surfaces are arranged at intervals in the rotating direction of the movable contact disc, the stop protrusion and the two stop surfaces are arranged in a relative rotation mode, when the stop protrusion contacts one of the stop surfaces, the movable contact disc is in a connection state, and when the stop protrusion contacts the other stop surface, the movable contact disc is in a disconnection state; the utility model has the characteristic of more stable structure.

Description

Rotary isolating switch and power supply system

Technical Field

The utility model relates to a power supply system, and belongs to a rotary isolating switch in the power supply system.

Background

Rotary disconnectors, which are often used in electrical distribution systems, often comprise an operating unit layer and at least two switching unit layers laminated below the operating unit layer. The operation mechanism in the operation unit layer is driven to operate, so that the movable contact disc in the switch unit layer is connected with and disconnected from the fixed contact, and the closing and opening of the isolating switch are realized.

In order to ensure that the operating mechanism does not excessively operate, the conventional isolating switch often adds a stop structure to the operating mechanism part, so that the operating mechanism stops moving when the operating mechanism reaches the switching-on and switching-off positions, and the stop effect is often not ideal although a certain stop effect can be achieved. The reason is that: because the operating mechanism is required to store energy when switching on and switching off, the spring releases energy to give a rotating force to the movable contact disc, even if the operating mechanism is stopped, the movable contact disc can still deflect excessively under the action of the spring force, so that the situation that the switch is blocked or the performance is greatly reduced occurs.

Disclosure of Invention

In view of the above, the present utility model aims to overcome the defects in the prior art, and is directed to a rotary isolating and power supplying system with a stopping effect on a movable contact.

The utility model provides a rotary isolating switch, which comprises an operation unit layer and at least two switch unit layers which are arranged in a stacked manner; the switch unit layer comprises a shell, a movable contact disc and a fixed contact, wherein the fixed contact is arranged on the periphery of the movable contact disc, the movable contact discs of adjacent switch unit layers are arranged in a linkage manner, and the operation unit layer is used for driving the movable contact disc to rotate so as to realize the connection and disconnection of the isolating switch; at least one layer of switch unit layer is internally provided with a stop structure, the stop structure is arranged between the movable contact disc and the shell of the switch unit layer, the stop structure comprises a stop protrusion and two stop surfaces, and the stop protrusion and the stop surfaces are respectively arranged on the movable contact disc and the shell; the two stop surfaces are arranged at intervals in the rotating direction of the movable contact disc, the stop protrusion and the two stop surfaces are arranged in a relative rotation mode, when the stop protrusion contacts one of the stop surfaces, the movable contact disc is in a connection state, and when the stop protrusion contacts the other stop surface, the movable contact disc is in a disconnection state.

By adopting the structure, as the movable contact plates are arranged in a linkage way, the problems in the prior art can be solved as long as a stop structure exists between at least one movable contact plate and the corresponding shell, and the situation that the movable contact plate is prevented from being blocked or greatly reduced in performance due to excessive movement under the action of spring force can be realized.

In some embodiments of the present application, the two sets of stop structures are in a 180 ° circumferential array relationship with the center of rotation of the movable contact disk as a center.

By adopting the structure, as the movable contact disc is rotationally arranged, two groups of stop structures which are 180-degree circumferential arrays are arranged, the stop effect can be improved, and the movable contact disc can be ensured to be stressed more stably when being stopped.

In some embodiments of the present application, the housing comprises a base and an upper cover; the stop structure is arranged between the base and the movable contact disc; or, the stop structure is arranged between the upper cover and the movable contact disc; or the stop structures are arranged between the upper cover and the movable contact disc and between the base and the movable contact disc.

With the adoption of the structure, the movable contact disc can be stopped with the base, can be stopped with the upper cover, or can be stopped with both the upper cover and the base at the same time.

In some embodiments of the present application, the movable contact disc includes a cover body and a lower seat, the cover body and the lower seat are in an integral structure or are connected by adopting buckling, the movable contact discs of two adjacent switch unit layers form linkage through an inserting structure, and the base is provided with a through hole through which the inserting structure can pass; the stop protrusion is arranged on the plug-in structure, and the stop surface is distributed on the wall of the through hole.

By adopting the structure, the stop structure is arranged on the wall of the through hole and the plug structure due to the plug structure which is mainly relied on in transmission between the movable contact plates, so that the stop effect can be improved.

In some embodiments of the present application, a guiding structure is disposed between the housing and the movable contact pad; the guide structure comprises a guide protrusion arranged on the shell, the peripheral wall of the movable contact disc is arranged adjacent to the inner wall of the guide protrusion, and the peripheral wall of the movable contact disc rotates along the inner wall of the guide protrusion in the rotating process of the movable contact disc; or, the guide structure comprises a guide protrusion arranged on the shell, a guide groove is formed in the upper surface or the lower surface of the movable contact disc, and the guide protrusion and the guide groove relatively rotate in the rotating process of the movable contact disc; or, the guide structure comprises a guide groove arranged on the shell, the upper surface or the lower surface of the movable contact disc is provided with a guide protrusion, and the guide protrusion and the guide groove relatively rotate in the rotating process of the movable contact disc.

By adopting the structure, the arrangement of the guide structure can ensure that the rotary motion between the movable contact disc and the shell is more stable.

In some embodiments of the present application, a travel channel is provided on the bottom surface or the top surface of the movable contact disc, the stop protrusion is provided on the housing and is located in the travel channel, and the two stop surfaces are two side walls of the travel channel; or, the shell is provided with a travel channel, the stop projection is arranged on the bottom surface or the top surface of the movable contact disc and is positioned in the travel channel, and the two stop surfaces are two side walls of the travel channel.

By adopting the structure, the stop protrusion is extended into the travel channel to form a stop structure, and meanwhile, the travel channel and the stop protrusion are respectively arranged on the movable contact disc and the shell, so that the movable contact disc has the characteristic of good stop effect.

In some embodiments of the present application, a stop structure is disposed in a first switching unit layer adjacent to an operation unit layer, and an upper cover of the switching unit layer is an operation unit layer housing; or, a stop structure is arranged in the switch unit layer which is at least one layer away from the operation unit layer, and the upper cover of the switch unit layer is the base of the switch unit layer of the adjacent layer.

By adopting the structure, when the stop structure is arranged on the first-layer switch unit layer, the first-layer switch unit layer is subjected to the maximum spring force of the operating mechanism, and the stress of other switch unit layers is relatively reduced gradually, so that the effect is better when the stop structure is arranged on the first-layer switch unit layer. The stop structure is arranged in the switch unit layer which is at least one layer away from the operation unit layer, so that the stop structure can stop all the movable contact plates as long as any layer is provided with the stop structure in the switch unit layer, and the problem in the prior art can be solved although the stop structure is not an optimal scheme.

In some embodiments of the present application, a stop structure is disposed in all switch unit layers, an upper cover of a first switch unit layer adjacent to an operation unit layer is an operation unit layer shell, and upper covers of the other switch unit layers are bases of switch unit layers adjacent to the first switch unit layer.

With this structure, the stop structure is provided in all the switch unit layers, and the stop effect is most stable.

In some embodiments of the present application, the stop projection moves from contact with one of the stop surfaces to contact with the other stop surface, and the movable contact pad rotates by an included angle A, which is 60 DEG A120 deg.

With this structure, the angle design with this structure is to consider the angle between the switch on and off.

A power supply system comprising a direct current source and a power conversion unit; the power conversion device further comprises the rotary isolating switch, wherein the rotary isolating switch is used for controlling the connection and disconnection of the direct current source and the power conversion unit.

The power supply system adopting the structure has the advantages that the internal switch is not easy to be blocked and the like, and the stability of the power supply system is greatly improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 shows a functional block diagram of a power supply system according to an embodiment of the present utility model;

FIG. 2 shows an exploded view of an isolating switch according to an embodiment of the present utility model;

fig. 3 shows a schematic structural diagram of a switching unit layer of an isolating switch according to an embodiment of the present utility model;

FIGS. 4-6 show schematic structural views of one embodiment of the stop structure of the present utility model;

FIGS. 7-9 show schematic structural views of another embodiment of the stop structure of the present utility model;

FIGS. 10-13 show schematic structural views of yet another embodiment of the stop structure of the present utility model;

FIG. 14 shows a schematic structural view of one of the guide structures of the present utility model;

15-16 illustrate a schematic structural view of another guide structure of the utility model;

fig. 17 shows a cross-sectional view and a partial enlargement of two embodiments of the guiding structure of the utility model.

Description of the embodiments

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

Examples

As shown in fig. 1, an embodiment of the present utility model is a power supply system including a direct current source 101, a power conversion unit 102 (inverter), and a disconnector K for controlling on and off of the direct current source 101 and the power conversion unit 102 (inverter).

As shown in fig. 2 to 3, the isolating switch includes an operation unit layer 1 and a 3-layer switching unit layer 2 laminated under the operation unit layer 1.

The operation unit layer 1 includes an operation unit layer housing 1a and an operation mechanism disposed in the operation unit layer housing 1a, where the operation mechanism may be a purely manual operation mechanism, and a user may implement opening and closing operations by using a knob disposed outside the operation unit layer 1, for example, CN217134258U. The operating mechanism can also adopt a semi-manual operating mechanism, a user can realize opening and closing operation through a knob arranged outside the operating unit layer 1, and when the operating mechanism receives an external breaking signal in a closing state, the operating mechanism can also automatically realize opening and closing operation under the action of a release, such as CN216902575U. The operating mechanism can also adopt a manual and automatic mixed operating mechanism, a user can not only realize opening and closing operations by externally arranging a knob on the operating unit layer 1, but also realize opening and closing operations under the action of a motor or an electromagnet by utilizing remote giving of opening and closing signals to the isolating switch, for example, CN215578314U. Whatever the above-mentioned type of operating mechanism, it is a relatively common structure in the art, and its specific implementation forms are also various, as long as it is capable of controlling the contact/separation of the movable contact disc 3 and the fixed contact 4.

The switch unit layer 2 comprises a shell, in this embodiment, the shell is a base 2a, the base 2a of the switch unit layer on the upper layer is equivalent to the upper cover of the switch unit layer on the upper layer, the shell of the operating mechanism layer is an upper cover of the switch unit layer on the first layer (the layer closest to the operating mechanism), and of course, the shell of the switch unit layer adopts the form, and can also adopt independent base 2a and upper cover structures, namely, each switch unit layer has respective base 2a and upper cover, and no matter what form of switch unit layer structure can only ensure the stability of the switch unit layer. In the present embodiment, the housings (the bases 2 a) are connected by snap-fit connection, but it is needless to say that an integrated structure, for example, an integrated structure formed by ultrasonic welding may be adopted. Each layer of switch unit layer is internally provided with a movable contact disc 3 and a fixed contact 4, a linkage structure is formed between the movable contact disc 3 and an operating mechanism, a movable contact bridge is arranged on the movable contact disc 3, and the rotation of the movable contact disc 3 can be realized through the movement of the operating mechanism, so that the movable contact bridge of the movable contact disc 3 is contacted with/separated from the fixed contact 4, and the connection and disconnection of a switch are ensured.

In order to ensure the stability of the movable contact 3, a stop structure is disposed on the movable contact 3 and the housing, and the stop structure is not limited to be disposed between the movable contact 3 and the base 2a of the current switching unit layer, but may be disposed between the movable contact 3 and the base 2a of the previous switching unit layer (between the movable contact 3 and the operating unit layer housing 1a for the first switching unit layer), or may be disposed between the movable contact 3 and the base 2a of the current switching unit layer and the base 2a of the previous switching unit layer (between the movable contact 3 and the operating unit layer housing 1a for the first switching unit layer). Likewise, the stop structure may be provided in either one of the switching cell layers (e.g., the first switching cell layer or a switching cell layer adjacent to the first switching cell layer) or in a plurality of switching cell layers. The following sets of embodiments illustrate the stop structure:

as shown in fig. 4 to 6, in this embodiment, a stroke channel 3a is formed on a surface of the movable contact disc 3 facing the base 2a, the stroke channel 3a is in a fan-shaped structure with the movable contact disc 3 as a center, two side walls of the stroke channel 3a form a stop surface 3a1, one of the corresponding movable contact discs 3 is in a closing position, and the other corresponding movable contact disc 3 is in a separating position. The base 2a is provided with a stop protrusion 2a1, the stop protrusion 2a1 extends into the travel channel 3a, when the movable contact plate 3 rotates, the stop protrusion 2a1 rotates relative to the travel channel 3a, the stop protrusion 2a1 contacts with one of the stop surfaces 3a1 when the movable contact plate 3 reaches a closing position, and the stop protrusion 2a1 contacts with the other stop surface 3a1 when the movable contact plate 3 reaches a separating position, so that stop is realized. When the stop protrusion 2a1 rotates from contacting one of the stop surfaces 3a1 to contacting the other stop surface 3a1, the movable contact plate 3 rotates by an angle a, which in this embodiment is 90 °, but may be 60 °, 70 °, 80 °, 100 °, 110 °, 120 °, or the like

Of course, since the moving mode of the movable contact disc 3 is rotary motion, two sets of stop structures are preferably arranged, and the two sets of stop structures are in a 180-degree circumferential array relationship with the rotation center of the movable contact disc 3 as the center of circle, simply, one set of stop structures rotates 180 degrees with the rotation center of the movable contact disc 3 as the center of circle, and the other set of stop structures are obtained. Of course, as a variant embodiment, it is also possible to exchange the arrangement of the stop projections 2a1 with the travel channels 3a, i.e. the stop projections 2a1 are arranged on the movable contact plate 3 and the travel channels 3a are arranged on the base 2 a.

As shown in fig. 7 to 9, in another embodiment of the stopping structure, in this embodiment, a travel channel 3a is formed on a surface of a base 2a of a layer of switch unit layer facing upward on a movable contact disc 3, the travel channel 3a is in a long waist hole shape with the movable contact disc 3 as a center, two side walls of the travel channel 3a form a stopping surface 3a1, one of the corresponding movable contact discs 3 is in a closing position, and the other corresponding movable contact disc 3 is in a separating position. The base 2a of the upper switching unit layer is provided with a stop protrusion 2a1, the stop protrusion 2a1 extends into the travel channel 3a, when the movable contact plate 3 rotates, the stop protrusion 2a1 rotates relative to the travel channel 3a, the stop protrusion 2a1 contacts with one of the stop surfaces 3a1 when the movable contact plate 3 reaches the closing position, and the stop protrusion 2a1 contacts with the other stop surface 3a1 when the movable contact plate 3 reaches the opening position, so that stop is realized. When the stop protrusion 2a1 rotates from contacting one of the stop surfaces 3a1 to contacting the other stop surface 3a1, the movable contact plate 3 rotates by an angle a, which in this embodiment is 90 °, but may be 60 °, 70 °, 80 °, 100 °, 110 °, 120 °, or the like

Of course, since the moving mode of the movable contact disc 3 is rotary motion, two sets of stop structures are preferably arranged, and the two sets of stop structures are in a 180-degree circumferential array relationship with the rotation center of the movable contact disc 3 as the center of circle, simply, one set of stop structures rotates 180 degrees with the rotation center of the movable contact disc 3 as the center of circle, and the other set of stop structures are obtained. Of course, as a variant embodiment, it is also possible to exchange the arrangement of the stop projections 2a1 with the travel channels 3a, i.e. the stop projections 2a1 are arranged on the movable contact plate 3 and the travel channels 3a are arranged on the base 2 a.

As a further embodiment of the stop structure, as shown in fig. 10-13, the stop structure is provided at the mating connection of two adjacent movable contact plates 3. Specifically, a first plugging protrusion c2 protrudes from the lower surface of the movable contact disc 3, a second plugging protrusion c1 protrudes from the upper surface of the movable contact disc 3, and the first plugging protrusion c2 and the second plugging protrusion c1 form a plugging fit. The base 2a is provided with a through hole for the first plug-in bulge c2 to pass through, the first plug-in bulge c2 is provided with a stop bulge 2a1, the hole wall of the through hole is provided with two stop bulges c3, a travel channel 3a is formed on the adjacent surface (namely, the stop surface 3a 1) of the stop bulge c3, when the movable contact disc 3 rotates, the stop bulge 2a1 rotates relative to the travel channel 3a, the stop bulge 2a1 contacts with one of the stop surfaces 3a1 when the movable contact disc 3 reaches a closing position, and the stop bulge 2a1 contacts with the other stop surface 3a1 when the movable contact disc 3 reaches a separating position, so that stop is realized. When the stop protrusion 2a1 rotates from contacting one of the stop surfaces 3a1 to contacting the other stop surface 3a1, the movable contact plate 3 rotates by an angle a, which in this embodiment is 90 °, but may be 60 °, 70 °, 80 °, 100 °, 110 °, 120 °, or the like

Of course, the two sets of stopping structures in this embodiment may also be arranged in two sets, and the two sets of stopping structures are in a 180 ° circumferential array relationship with the rotation center of the movable contact disc 3 as the center of circle, and simply, one set of stopping structures rotates 180 ° with the rotation center of the movable contact disc 3 as the center of circle, so that the other set of stopping structures is obtained.

In order to ensure that the rotation of the movable contact disc 3 is more stable, guide structures are arranged on the movable contact disc 3 and the shell. The following illustrate several sets of embodiments of the guide structure:

as shown in fig. 14 and 17, in this embodiment, a guide structure is provided between the base 2a of the upper switching unit layer and the current movable contact 3 as one of the stopper structure embodiments. Specifically, the base 2a of the upper switching unit layer extends downward to form a ring-shaped guide protrusion d1, and the upper peripheral wall of the movable contact disc 3 is just in the hollow portion of the ring-shaped guide protrusion d1, that is, during the rotation of the movable contact disc 3, the peripheral wall of the movable contact disc 3 rotates along the inner wall of the guide protrusion d 1. The guide projection d1 does not have to be a complete ring shape, but a gap in the middle portion is sufficient as long as the rotation along the inner wall of the guide projection d1 can be ensured when the movable contact 3 rotates.

As another embodiment of the stopper structure, as shown in fig. 15 to 17, in the present embodiment, a guide structure is provided between the base 2a of each switching unit layer and the movable contact 3. Specifically, the base 2a extends upward to form a guide protrusion d1, a guide groove d2 is formed at a position corresponding to the lower surface of the movable contact plate 3, the guide protrusion d1 extends into the guide groove d2, and when the movable contact plate 3 rotates, the guide protrusion d1 and the guide groove d2 rotate relatively. Of course, as a modified embodiment, the arrangement of the guide protrusion d1 and the guide groove d2 in this embodiment may be reversed, that is, the guide groove d2 is opened on the base 2a, and the guide protrusion d1 is provided on the movable contact panel 3. Of course, as another modification, the guide structure may be provided on the base 2a of the upper switching unit layer and the current movable contact 3, that is, the guide protrusion d1 and the guide groove d2, which are provided on the base 2a of the upper switching unit layer and the movable contact 3.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.

Claims (10)

1. A rotary isolating switch comprises an operation unit layer and at least two switch unit layers which are arranged in a stacked manner; the switch unit layer comprises a shell, a movable contact disc and a fixed contact, wherein the fixed contact is arranged on the periphery of the movable contact disc, the movable contact discs of adjacent switch unit layers are arranged in a linkage manner, and the operation unit layer is used for driving the movable contact disc to rotate so as to realize the connection and disconnection of the isolating switch; the method is characterized in that: at least one layer of switch unit layer is internally provided with a stop structure, the stop structure is arranged between the movable contact disc and the shell of the switch unit layer, the stop structure comprises a stop protrusion and two stop surfaces, and the stop protrusion and the stop surfaces are respectively arranged on the movable contact disc and the shell; the two stop surfaces are arranged at intervals in the rotating direction of the movable contact disc, the stop protrusion and the two stop surfaces are arranged in a relative rotation mode, when the stop protrusion contacts one of the stop surfaces, the movable contact disc is in a connection state, and when the stop protrusion contacts the other stop surface, the movable contact disc is in a disconnection state.

2. A rotary isolating switch as in claim 1, further characterized by: the two groups of stop structures are in 180-degree circumferential array relation by taking the rotation center of the movable contact disc as the circle center.

3. A rotary isolating switch as in claim 1, further characterized by: the shell comprises a base and an upper cover; the stop structure is arranged between the base and the movable contact disc; or, the stop structure is arranged between the upper cover and the movable contact disc; or the stop structures are arranged between the upper cover and the movable contact disc and between the base and the movable contact disc.

4. A rotary isolating switch as in claim 3, further characterized by: the movable contact plate comprises a cover body and a lower seat, the cover body and the lower seat are in an integrated structure or are connected by buckling, the movable contact plates of two adjacent switch unit layers are linked through a plug-in structure, the base is provided with a through hole through which the plug-in structure can pass, the stop protrusion is arranged on the plug-in structure, and the stop surface is distributed on the wall of the through hole.

5. A rotary isolating switch as in claim 1, further characterized by: a guide structure is arranged between the shell and the movable contact disc; the guide structure comprises a guide protrusion arranged on the shell, the peripheral wall of the movable contact disc is arranged adjacent to the inner wall of the guide protrusion, and the peripheral wall of the movable contact disc rotates along the inner wall of the guide protrusion in the rotating process of the movable contact disc; or, the guide structure comprises a guide protrusion arranged on the shell, a guide groove is formed in the upper surface or the lower surface of the movable contact disc, and the guide protrusion and the guide groove relatively rotate in the rotating process of the movable contact disc; or, the guide structure comprises a guide groove arranged on the shell, the upper surface or the lower surface of the movable contact disc is provided with a guide protrusion, and the guide protrusion and the guide groove relatively rotate in the rotating process of the movable contact disc.

6. A rotary isolating switch as in claim 1, further characterized by: the bottom surface or the top surface of the movable contact disc is provided with a travel channel, two stop surfaces are two side walls of the travel channel, and the stop protrusion is arranged on the shell and is positioned in the travel channel; or, the shell is provided with a travel channel, the two stop surfaces are two side walls of the travel channel, and the stop protrusion is arranged on the bottom surface or the top surface of the movable contact disc and is positioned in the travel channel.

7. A rotary isolating switch as in claim 3, further characterized by: a stop structure is arranged in a first switching unit layer adjacent to the operation unit layer, and the upper cover of the switching unit layer is an operation unit layer shell; or, a stop structure is arranged in the switch unit layer which is at least one layer away from the operation unit layer, and the upper cover of the switch unit layer is the base of the switch unit layer of the adjacent layer.

8. A rotary isolating switch as in claim 3, further characterized by: all switch unit layers are internally provided with stop structures, the upper covers of the first switch unit layer adjacent to the operation unit layer are operation unit layer shells, and the upper covers of the other switch unit layers are bases of the switch unit layers adjacent to the first switch unit layer.

9. A rotary isolating switch as in claim 1, further characterized by: the stop protrusion moves from contact with one stop surface to contact with the other stop surface, and the movable contact disc rotates by an included angle A, wherein the included angle A is more than or equal to 60 degrees and less than or equal to 120 degrees.

10. A power supply system comprising a direct current source and a power conversion unit; the method is characterized in that: a rotary isolating switch according to any one of claims 1-9 for controlling the switching on and off of a direct current source and a power conversion unit.