Opening and closing operation mechanism and vacuum circuit breaker

Abstract

The utility model relates to the technical field of circuit breakers, and discloses an opening and closing operation mechanism and a vacuum circuit breaker, and the opening and closing operation mechanism comprises a ratchet wheel mechanism which comprises a ratchet wheel and a pawl which are matched with each other, and the ratchet wheel is suitable for abutting against and cooperating with a closing energy storage maintaining latch; the cam is fixedly connected with the side surface of the ratchet wheel and is suitable for abutting against and matching with the crank arm assembly; wear-resistant coatings are arranged on the surfaces of the ratchet wheel, the pawl and the cam. According to the opening and closing operation mechanism provided by the utility model, the wear-resistant coatings are arranged on the surfaces of the ratchet wheel, the pawl and the cam, which are used for being abutted against and contacted with other structures, so that the wear of the ratchet wheel, the pawl and the cam body is reduced, the service life of the opening and closing operation mechanism is prolonged, and the service life of a circuit breaker is further prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, and particularly relates to a closing and opening operating mechanism and a vacuum circuit breaker. Background Art

[0002] The closing and opening operations of a circuit breaker are achieved through the mutual movement of the components of its internal operating mechanism. However, during the closing and opening or energy storage processes, these components are in a stressed state and will be subject to a certain degree of wear during the movement. Therefore, the wear resistance of the operating mechanism will directly affect the service life of the circuit breaker. Currently, the service life of a vacuum circuit breaker is usually about 10,000 closing and opening operations, which is relatively short. When the number of closing and opening operations exceeds a certain number, misoperations or failures of closing and opening occur due to the wear of the components, directly affecting the use of the circuit breaker. Summary of the Utility Model

[0003] In view of this, the utility model provides a closing and opening operating mechanism and a vacuum circuit breaker to solve the problem that the service life of the circuit breaker is relatively short, and when the number of closing and opening operations exceeds a certain number, misoperations or failures of closing and opening occur due to the wear of the operating mechanism, thereby affecting the use of the circuit breaker.

[0004] In a first aspect, the utility model provides a closing and opening operating mechanism for closing and opening operations. The closing and opening operating mechanism includes:

[0005] A ratchet mechanism, including a ratchet and a pawl that cooperate with each other, and the ratchet is adapted to be in abutting cooperation with a closing energy storage retaining pawl;

[0006] A cam, fixedly connected to the side surface of the ratchet, and the cam is adapted to be in abutting cooperation with a toggle arm assembly;

[0007] Wear-resistant coatings are provided on the surfaces of the ratchet, pawl, and cam.

[0008] Advantageous Effects: By providing wear-resistant coatings on the surfaces of the ratchet, pawl, and cam that are used for abutting contact with other structures, the wear of the ratchet, pawl, and cam bodies is reduced, thereby increasing the service life of the closing and opening operating mechanism, and further increasing the service life of the circuit breaker.

[0009] In an optional embodiment, the wear-resistant coating includes a CrN (chromium nitride) film layer.

[0010] In an optional embodiment, the wear-resistant coating further includes an AlTiCrSiWN film layer, and the AlTiCrSiWN film layer and the CrN film layer are laminated.

[0011] Advantageous Effects: By laminating wear-resistant coatings composed of film layers with different components, the wear resistance of the wear-resistant coating is improved by utilizing the strong interfacial effect and interlayer coupling effect of the multi-layer structure coating.

[0012] In an alternative embodiment, both the CrN film layer and the AlTiCrSiWN film layer are provided with multiple layers, and the CrN film layer and the AlTiCrSiWN film layer are alternately stacked in sequence.

[0013] In an alternative embodiment, an intermediate film layer is provided between the CrN film layer and the AlTiCrSiWN film layer.

[0014] Beneficial effects: By providing an intermediate film layer between the CrN film layer and the AlTiCrSiWN film layer, the internal stress between the CrN film layer and the AlTiCrSiWN film layer can be reduced, the toughness of the wear-resistant coating can be enhanced, and the corrosion resistance of the wear-resistant coating can be improved and the thickness of the coating can be increased.

[0015] In an alternative embodiment, the intermediate film layer includes a Zr (zirconium) film layer and / or a Cr (chromium) film layer.

[0016] In an alternative embodiment, the thickness of the wear-resistant coating is greater than or equal to 5 μm.

[0017] Beneficial effects: By making the thickness of the wear-resistant coating greater than or equal to 5 μm, the protective effect of the wear-resistant coating on the substrate can be improved.

[0018] In an alternative embodiment, the hardness of the wear-resistant coating is greater than 4 GPa.

[0019] Beneficial effects: By making the hardness of the wear-resistant coating greater than 4 GPa, the wear resistance of the wear-resistant coating can be ensured.

[0020] In an alternative embodiment, the outer surface of the wear-resistant coating is a smooth surface.

[0021] Beneficial effects: By making the outer surface of the wear-resistant coating a smooth surface, the frictional force when it slides in contact with other structures can be reduced, thereby reducing wear.

[0022] In a second aspect, the present invention further provides a vacuum circuit breaker, including: the above-mentioned opening and closing operating mechanism.

[0023] Since the vacuum circuit breaker includes the opening and closing operating mechanism and has the same effects as the opening and closing operating mechanism, its beneficial effects will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 Schematic diagram of the opening and closing operating mechanism of the present utility model;

[0026] Figure 2 Schematic diagram of the ratchet mechanism of the present utility model;

[0027] Figure 3 is Figure 2 Partial enlarged view of position A in

[0028] Figure 4 Cross-sectional schematic diagram of the pawl of the present utility model;

[0029] Figure 5 Side view of the pawl of the present utility model;

[0030] Figure 6 is Figure 5 Partial enlarged view of position B in

[0031] Explanation of reference numerals:

[0032] 1. Ratchet mechanism; 11. Ratchet; 12. Pawl; 2. Cam; 3. Wear-resistant coating; 4. Closing energy storage holding detent; 5. Closing holding detent; 6. Closing trigger; 7. Opening trigger; 8. Rocker arm assembly. Specific embodiments

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0034] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0035] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0036] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0037] The following combines Figures 1 to 6 , to describe the embodiments of the present utility model.

[0038] According to an embodiment of the present utility model, on the one hand, a closing and opening operating mechanism is provided for closing and opening operations. The closing and opening operating mechanism includes:

[0039] A ratchet mechanism 1, including a ratchet 11 and a pawl 12 that cooperate with each other. The ratchet 11 is adapted to be in abutting cooperation with the closing energy storage holding detent 4;

[0040] A cam 2, fixedly connected to the side surface of the ratchet 11. The cam 2 is adapted to be in abutting cooperation with the toggle arm assembly 8;

[0041] Wear-resistant coatings 3 are provided on the surfaces of the ratchet 11, the pawl 12, and the cam 2.

[0042] The closing and opening operating mechanism provided in this embodiment reduces the wear of the bodies of the ratchet 11, the pawl 12, and the cam 2 by providing wear-resistant coatings 3 on the surfaces of the ratchet 11, the pawl 12, and the cam 2 that abut and slide relative to other structures, thereby increasing the service life of the closing and opening operating mechanism, and further increasing the service life of the circuit breaker.

[0043] Specifically, Figure 1 is a structural schematic diagram of a closing and opening operating mechanism. The closing and opening operating mechanism further includes a closing holding detent 5, a closing trigger 6, a tripping trigger 7, etc. The ratchet 11 is in abutting cooperation with the closing trigger 6 via the closing energy storage holding detent 4; the toggle arm assembly 8 is in abutting cooperation with the closing holding detent 5, and the cam 2 is in abutting cooperation with the tripping trigger 7 via the toggle arm assembly 8 and the closing holding detent 5. It should be noted that the operating mechanism for closing and opening belongs to the prior art (for example, the operating mechanism disclosed in the patent with the publication number CN206584856U), so the specific structural form and working process of the closing and opening operating mechanism will not be described in detail here.

[0044] The pawl 12 is arranged on the toggle arm assembly 8 and cooperates with the ratchet wheel 11 to enable the ratchet wheel 11 to rotate unidirectionally. During the opening / closing operation or energy storage process, relative movement occurs between the ratchet wheel 11 and the pawl 12, between the ratchet wheel 11 and the closing energy storage retaining pawl 4, and between the cam 2 and the toggle arm assembly 8. During this process, the surfaces of the ratchet wheel 11, the pawl 12, and the cam 2 are subject to certain wear. When the wear exceeds a certain amount, it may cause misoperation or non-action of the opening / closing, thereby affecting the use of the circuit breaker. Therefore, wear-resistant coatings 3 are provided on the surfaces of the ratchet wheel 11, the pawl 12, and the cam 2 to reduce the amount of wear and improve the service life of the opening / closing operating mechanism. Among them, the wear-resistant coating 3 can only cover the worn areas on the surfaces of the ratchet wheel 11, the pawl 12, and the cam 2, or can cover their entire surfaces. Before preparing the wear-resistant coating 3, the surfaces of the ratchet wheel 11, the pawl 12, and the cam 2 are treated to increase their surface roughness, which is beneficial to ensuring that the bonding force of the wear-resistant coating 3 meets Class HF1 and the adhesion of the wear-resistant coating 3 is greater than 100 N.

[0045] In some embodiments, in combination with Figures 1 to 6 as shown, the wear-resistant coating 3 includes a CrN (chromium nitride) film layer.

[0046] Specifically, a CrN film layer is prepared in a preset area on the surfaces of the ratchet wheel 11, the pawl 12, and the cam 2 to utilize the relatively high surface hardness of the CrN coating to play an anti-wear role on the surfaces of the ratchet wheel 11, the pawl 12, and the cam 2.

[0047] In some embodiments, in combination with Figures 1 to 6 as shown, the wear-resistant coating 3 further includes an AlTiCrSiWN film layer, and the AlTiCrSiWN film layer is laminated with the CrN film layer.

[0048] The opening / closing operating mechanism provided in this embodiment enables the wear-resistant coating 3 to be composed of laminated film layers of different components, so as to utilize the strong interface effect and interlayer coupling effect of the multi-layer structure coating to improve the wear resistance of the wear-resistant coating 3.

[0049] In some embodiments, in combination with Figures 1 to 6 as shown, both the CrN film layer and the AlTiCrSiWN film layer are provided with multiple layers, and the CrN film layer and the AlTiCrSiWN film layer are alternately laminated in sequence.

[0050] Specifically, multiple CrN film layers and multiple AlTiCrSiWN film layers are alternately laminated in sequence to form a periodic composite coating, so as to utilize the strong interface effect and interlayer coupling effect of the multi-layer structure coating to further improve the wear resistance of the wear-resistant coating 3.

[0051] In some embodiments, in combination with Figures 1 to 6 as shown, an intermediate film layer is provided between the CrN film layer and the AlTiCrSiWN film layer.

[0052] The opening and closing operating mechanism provided in this embodiment reduces the internal stress between the CrN film layer and the AlTiCrSiWN film layer by providing an intermediate film layer therebetween, enhances the toughness of the wear-resistant coating 3, and can improve the corrosion resistance of the wear-resistant coating 3 and increase the thickness of the wear-resistant coating 3.

[0053] Specifically, the CrN film layer, the intermediate film layer, and the AlTiCrSiWN film layer are alternately laminated in sequence to form a periodic composite coating.

[0054] In some embodiments, as Figures 1 to 6 shown, the intermediate film layer includes a Zr (zirconium) film layer and / or a Cr (chromium) film layer.

[0055] Specifically, metals Zr and Cr have good corrosion resistance, as well as good plasticity and toughness. The CrN film layer and the AlTiCrSiWN film layer are prepared by the magnetron composite mechanical filtering arc technology of intense current pulsed discharge. By the composite magnetic field enhanced magnetron sputtering technology, a Zr film layer and / or a Cr film layer are embedded between the CrN film layer and the AlTiCrSiWN film layer. On the one hand, the stress of pulsed ion plating CrN and AlTiCrSiWN is released, improving the toughness of the wear-resistant coating 3; on the other hand, Zr and / or Cr ions of atomic size can fill the pores of ion plating CrN and AlTiCrSiWN, enhancing the corrosion resistance of the wear-resistant coating 3. By modulating the period and the number of alternating depositions, the wear-resistant coating 3, that is, the Cr / CrN multi-layer and (Zr, Cr) / AlTiCrSiWN multi-layer super-strong tough composite coating, is obtained. For the specific preparation method, please refer to the patent with the publication number CN117737644A.

[0056] By high-throughput calculation based on the crystal structure prediction method, a reasonable structure of the Cr / CrN multi-layer and (Zr, Cr) / AlTiCrSiWN multi-layer super-strong tough composite coating is constructed, which can effectively reduce the internal stress between the CrN film layer and the AlTiCrSiWN film layer, and at the same time increase the thickness of the wear-resistant coating 3. On the basis of maintaining the original performance, new special properties such as super-hardness and super-toughness are imparted to the wear-resistant coating 3.

[0057] In some embodiments, as Figures 1 to 6 shown, the thickness of the wear-resistant coating 3 is greater than or equal to 5 μm.

[0058] The opening and closing operating mechanism provided in this embodiment ensures that the thickness of the wear-resistant coating 3 is greater than or equal to 5 μm to avoid the situation where the thickness of the wear-resistant coating 3 is too thin to play a protective role for the substrate.

[0059] In some embodiments, as Figures 1 to 6As shown, the hardness of the wear-resistant coating 3 is greater than 4 GPa.

[0060] For the switching operating mechanism provided in this embodiment, by making the hardness of the wear-resistant coating 3 greater than 4 GPa, the wear resistance of the wear-resistant coating 3 is ensured.

[0061] In some embodiments, in combination Figures 1 to 6 As shown, the outer surface of the wear-resistant coating 3 is a smooth surface.

[0062] For the switching operating mechanism provided in this embodiment, by making the outer surface of the wear-resistant coating 3 a smooth surface, the frictional force during its sliding contact with other structures is reduced, thereby reducing wear.

[0063] Specifically, burrs and the like on the outer surface of the wear-resistant coating 3 are removed to make the outer surface of the wear-resistant coating 3 a smooth surface, thereby further reducing wear and increasing the service life of the switching operating mechanism.

[0064] According to an embodiment of the present invention, on the other hand, a vacuum circuit breaker is further provided, including: the above-mentioned switching operating mechanism.

[0065] Vacuum circuit breakers are often used in places that require frequent switching on and off. By adopting the above-mentioned switching operating mechanism, the service life of the vacuum circuit breaker can be effectively increased, which is beneficial to reducing the replacement frequency of the vacuum circuit breaker.

[0066] Obviously, the above embodiments are only examples for clear illustration and not limitations on the implementation manners. Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the present invention.

Claims

1. A switch opening and closing operating mechanism, characterized in that: Used for opening and closing operation, the opening and closing operation mechanism comprises: A ratchet mechanism (1) comprises a ratchet (11) and a pawl (12) which cooperate with each other, wherein the ratchet (11) is suitable for abutting and cooperating with a closing energy storage retaining pawl (4); A cam (2) is fixedly connected to the side of the ratchet wheel (11), and the cam (2) is suitable for abutting and cooperating with the crank arm assembly (8); The surfaces of the ratchet wheel (11), the ratchet pawl (12) and the cam (2) are provided with a wear-resistant coating (3).

2. The opening and closing operating mechanism according to claim 1, characterized in that: The wear-resistant coating (3) comprises a CrN film layer.

3. The opening and closing operating mechanism according to claim 2, characterized in that: The wear-resistant coating (3) further comprises an AlTiCrSiWN film layer, and the AlTiCrSiWN film layer is stacked with the CrN film layer.

4. The opening and closing operating mechanism according to claim 3, characterized in that: The CrN film layer and the AlTiCrSiWN film layer are both provided with multiple layers, and the CrN film layer and the AlTiCrSiWN film layer are alternately stacked in sequence.

5. The opening and closing operating mechanism according to claim 3, characterized in that: An intermediate film layer is arranged between the CrN film layer and the AlTiCrSiWN film layer.

6. The opening and closing operating mechanism according to claim 5, characterized in that: The intermediate film layer includes a Zr film layer and / or a Cr film layer.

7. The opening and closing operating mechanism according to claim 1, characterized in that: The thickness of the wear-resistant coating (3) is greater than or equal to 5 μm.

8. The opening and closing operating mechanism according to claim 1, characterized in that: The hardness of the wear-resistant coating (3) is greater than 4 GPa.

9. The opening and closing operating mechanism according to claim 1, characterized in that: The outer surface of the wear-resistant coating (3) is a smooth surface.

10. A vacuum circuit breaker, characterized in that: include: The opening and closing operating mechanism according to any one of claims 1 to 9.

Images