Oil buffer speed reducer of vacuum circuit breaker

Abstract

The utility model discloses an oil buffer speed reducer of a vacuum circuit breaker. The oil buffer speed reducer comprises an oil cylinder and a piston, the piston is arranged in the oil cylinder in a matched mode and divides the interior of the oil cylinder into an upper cavity and a lower cavity. One side, facing the upper cavity, of the piston is provided with a rod body, and the rod body extends out of the oil cylinder and is used for being connected with an operating mechanism of the vacuum circuit breaker; the hydraulic cylinder further comprises an oil channel used for communicating hydraulic oil in the upper cavity and the lower cavity, and the oil channel is configured in the mode that the oil passing amount of the oil channel when the piston moves upwards is larger than the oil passing amount of the oil channel when the piston moves downwards. When the operating mechanism is switched on, the rod body drives the piston to move upwards, and hydraulic oil in the upper cavity flows to the lower cavity through the oil duct, and when the operating mechanism is switched off, the rod body drives the piston to move downwards, and hydraulic oil in the lower cavity flows to the upper cavity through the oil duct. And during closing and opening, the oil return quantity is increased during closing, so that the opening speed reduction effect is obvious.

Description

Technical Field

[0001] This utility model relates to the field of vacuum circuit breaker technology, specifically to an oil buffer deceleration device for a vacuum circuit breaker. Background Technology

[0002] Vacuum circuit breakers are generally used in three-phase AC systems. They use a vacuum interrupter as the breaking point and a spring mechanism as the power output for opening and closing. They can be used in power plants and substations for the protection and control of power grid systems.

[0003] Vacuum circuit breakers in medium-voltage systems have small opening distances. The oil buffer device of this type of vacuum circuit breaker is generally used for buffering in the latter half to prevent the circuit breaker contacts from rebounding after opening, causing re-breakdown and resulting in interruption failure.

[0004] Because 252kV vacuum circuit breakers have a large opening distance and high operating power, the following situation occurs during vacuum circuit breaker testing when using existing oil buffer devices:

[0005] 1. When operating in a single trip, the tripping characteristics are inconsistent;

[0006] 2. When closing or opening, the deceleration characteristic of the opening circuit is insufficient. The specific reason is that there is insufficient oil return in the oil buffer device when closing, which leads to insufficient oil volume and reduced buffering force when opening. Utility Model Content

[0007] The purpose of this utility model is to address the aforementioned shortcomings of existing oil buffer devices used in 252kV vacuum circuit breakers by providing an oil buffer deceleration device for vacuum circuit breakers. This device has stable closing and opening characteristics, and increases the return oil volume during closing when the vacuum circuit breaker is closing, thereby improving the deceleration effect during opening.

[0008] This utility model is achieved through the following technical solution:

[0009] This utility model provides a vacuum circuit breaker oil buffer deceleration device, including an oil cylinder and a piston; the piston is fitted inside the oil cylinder and divides the inside of the oil cylinder into an upper chamber and a lower chamber; the piston has a rod on the side facing the upper chamber, the rod extending out of the oil cylinder for connection with the operating mechanism of the vacuum circuit breaker; it also includes an oil passage for connecting the hydraulic oil inside the upper chamber and the lower chamber, the oil passage being configured such that the oil flow rate when the piston moves upward is greater than the oil flow rate when the piston moves downward.

[0010] As a preferred embodiment of this utility model, the oil passage includes a main oil hole and a secondary oil hole. The main oil hole connects the upper chamber and the lower chamber. A one-way valve is provided in the secondary oil hole. The one-way valve opens when the piston moves upward, allowing the hydraulic oil in the upper chamber to flow into the lower chamber.

[0011] As a preferred embodiment of this utility model, multiple auxiliary oil holes are provided and are evenly distributed around the center of the piston.

[0012] As a preferred embodiment of this utility model, the auxiliary oil hole is a stepped hole, and the section facing the lower cavity is the large diameter section, and the one-way valve is located in the large diameter section.

[0013] As a preferred embodiment of this utility model, the main oil hole includes an axial section and a radial section that are interconnected. One end of the axial section is connected to the lower cavity, and one end of the radial section is connected to the upper cavity.

[0014] As a preferred embodiment of this utility model, the one-way valve is a ball-type one-way valve.

[0015] As a preferred embodiment of this utility model, the piston and the rod are an integral structure.

[0016] As a preferred embodiment of the present invention, the hydraulic cylinder includes a cylinder barrel and a cylinder cover disposed at the open end of the cylinder barrel, and the rod extends outward through the cylinder cover.

[0017] As a preferred embodiment of this utility model, a sealed connection is formed between the cylinder head and the cylinder barrel, and a sealed connection is formed between the cylinder head and the rod body.

[0018] As a preferred embodiment of this utility model, one end of the rod located outside the oil cylinder is connected to the transmission crank arm in the vacuum circuit breaker operating mechanism.

[0019] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0020] In this utility model, the piston of the oil buffer deceleration device for a vacuum circuit breaker forms a linkage structure through the rod and the transmission crank arm. Because a one-way valve is installed on the piston, the one-way valve opens when the circuit breaker is closed, increasing the return oil speed and the oil volume when the circuit breaker is opened. The one-way valve closes when the circuit breaker is opened. This device has oil buffer linkage for closing and opening, and the opening characteristics are consistent. When closing and opening, the increased return oil volume during closing results in a significant deceleration effect during opening, and the characteristics are consistent. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the exemplary embodiments of this utility model, the drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this utility model and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings:

[0022] Figure 1 This is a schematic diagram of the transmission of the vacuum circuit breaker oil buffer deceleration device in this utility model;

[0023] Figure 2 This is a schematic diagram of the oil cylinder of the vacuum circuit breaker oil buffer deceleration device in this utility model.

[0024] The attached diagram shows the markings and corresponding component names:

[0025] 1-Cylinder, 2-Piston, 21-Rod, 3-Main oil hole, 4-Secondary oil hole, 5-Check valve, 51-Steel ball, 6-Transmission crank arm, 7-Hydraulic oil. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0028] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary and secondary relationship of the indicated technical features.

[0029] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0030] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists, A and B exist simultaneously, and B exists. In addition, the character " / " in this document generally indicates that the related objects before and after it have an "or" relationship.

[0031] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0032] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces), unless otherwise explicitly specified.

[0033] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0034] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0035] Please refer to Figure 1 and Figure 2 This application provides a vacuum circuit breaker oil buffer deceleration device, including a cylinder 1 and a piston 2. The piston 2 is disposed inside the cylinder 1 and divides the interior of the cylinder 1 into an upper chamber and a lower chamber. The piston 2 has a rod 21 on the side facing the upper chamber, which extends out of the cylinder 1 and is used to connect with the operating mechanism of the vacuum circuit breaker. It also includes an oil passage for connecting the hydraulic oil 7 inside the upper chamber and the lower chamber. The oil passage is configured such that the oil flow rate when the piston 2 moves upward is greater than the oil flow rate when the piston 2 moves downward.

[0036] When the device is in use, the rod 21 on the upper side of the piston 2 is connected to the operating mechanism of the vacuum circuit breaker. When the circuit is closed by the operating mechanism, the rod 21 drives the piston 2 to move upward, and the hydraulic oil 7 in the upper chamber will flow to the lower chamber through the oil passage. When the circuit is opened by the operating mechanism, the rod 21 drives the piston 2 to move downward, and the hydraulic oil 7 in the lower chamber will flow to the upper chamber through the oil passage.

[0037] In this application, the oil passage is configured such that the oil flow rate when piston 2 moves upward is greater than the oil flow rate when piston 2 moves downward. During closing and opening, the return oil flow rate increases during closing, resulting in a significant deceleration effect during opening.

[0038] According to some embodiments of this application, the oil passage includes a main oil hole 3 and a secondary oil hole 4. The main oil hole 3 connects the upper chamber and the lower chamber. A one-way valve 5 is provided in the secondary oil hole 4. The one-way valve 5 opens when the piston 2 moves upward, so that the hydraulic oil 7 in the upper chamber flows into the lower chamber.

[0039] In this application, the main oil hole 3 is always connected to the upper chamber and the lower chamber, while the auxiliary oil hole 4 is equipped with a one-way valve 5. Therefore, the auxiliary oil hole 4 is actually a one-way channel. When the circuit breaker is closed, the piston 2 moves upward and the one-way valve 5 opens, which increases the return oil speed and increases the oil volume when the circuit breaker is opened. When the circuit breaker is opened, the one-way valve 5 closes, thus achieving the effect of deceleration during opening.

[0040] According to some embodiments of this application, multiple auxiliary oil holes 4 are provided and are evenly distributed around the center of the piston 2. Specifically, four auxiliary oil holes 4 can be evenly arranged along the circumference, and each auxiliary oil hole 4 is provided with a one-way valve 5.

[0041] According to some embodiments of this application, the auxiliary oil hole 4 is a stepped hole, and the section facing the lower cavity is the large-diameter section, with the one-way valve 5 located in the large-diameter section. The small-diameter section of the auxiliary oil hole 4 penetrates the upper side of the piston 2, thereby connecting with the upper cavity, and the large-diameter section of the auxiliary oil hole 4 penetrates the lower side of the piston 2, thereby connecting with the lower cavity.

[0042] According to some embodiments of this application, the piston 2 and the rod 21 are an integral structure. That is, the upper side of the piston 2 and the lower end face of the rod 21 are connected as one piece. By designing the two as an integral structure, it is easier to manufacture and also easier to arrange the main oil hole 3.

[0043] According to some embodiments of this application, the main oil hole 3 includes an axial section and a radial section that communicate with each other. One end of the axial section is connected to the lower cavity, and one end of the radial section is connected to the upper cavity. Specifically, the axial section is arranged axially at the center of the piston 2, while the radial section can be arranged radially at the lower end of the rod 21. Of course, multiple radial sections can be arranged circumferentially, and all multiple radial sections communicate with the axial section.

[0044] According to some embodiments of this application, the one-way valve 5 is a ball-type one-way valve 5. This type of one-way valve 5 has a simple structure and can be easily and directly installed in the auxiliary oil port 4.

[0045] According to some embodiments of this application, the hydraulic cylinder 1 includes a cylinder barrel and a cylinder cover disposed at the open end of the cylinder barrel, and the rod 21 extends outward through the cylinder cover.

[0046] According to some embodiments of this application, a sealed connection is formed between the cylinder head and the cylinder barrel, and a sealed connection is formed between the cylinder head and the rod body 21. By adopting the above solution, leakage of hydraulic oil 7 between the cylinder head and the cylinder barrel, and between the cylinder head and the rod body 21, can be avoided.

[0047] According to some embodiments of this application, one end of the rod 21 located outside the cylinder 1 is connected to the transmission crank arm 6 in the vacuum circuit breaker operating mechanism. The transmission crank arm 6 drives the rod 21 and piston 2 to move up and down, achieving synchronous linkage with the vacuum circuit breaker operating mechanism.

[0048] The specific working principle of the oil-buffered deceleration device in this application is as follows:

[0049] Circuit breaker closing: The transmission crank arm 6 rotates counterclockwise, driving the piston 2 to move upward. At this time, the pressure in the upper chamber will increase. The steel ball 51 in the check valve 5 moves downward under the action of the hydraulic oil 7. The steel ball 51 in the check valve 5 falls down, and the hydraulic oil 7 in the upper chamber of the piston 2 in the cylinder 1 flows back to the lower chamber through the main oil hole 3 and the auxiliary oil hole 4.

[0050] Circuit breaker tripping: The transmission crank arm 6 rotates clockwise, driving the piston 2 to move downward. At this time, the pressure in the lower chamber will increase. The steel ball 51 in the one-way valve 5 moves upward under the action of the hydraulic oil 7, which closes the auxiliary oil hole 4. The hydraulic oil 7 in the lower chamber of the piston 2 in the cylinder 1 flows back to the upper chamber through the main oil hole 3. Since the oil passage during tripping reduces the auxiliary oil hole 4, the tripping deceleration effect is achieved.

[0051] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A vacuum circuit breaker oil buffer deceleration device, characterized in that, The device includes a hydraulic cylinder and a piston; the piston is fitted inside the hydraulic cylinder and divides the interior of the hydraulic cylinder into an upper chamber and a lower chamber; the piston has a rod on the side facing the upper chamber, the rod extending out of the hydraulic cylinder for connection to the operating mechanism of a vacuum circuit breaker; it also includes an oil passage for connecting the hydraulic oil inside the upper chamber and the lower chamber, the oil passage being configured such that the oil flow rate when the piston moves upward is greater than the oil flow rate when the piston moves downward.

2. The vacuum circuit breaker oil buffer deceleration device according to claim 1, characterized in that, The oil passage includes a main oil port and a secondary oil port. The main oil port connects the upper chamber and the lower chamber. A one-way valve is provided in the secondary oil port. The one-way valve opens when the piston moves upward, allowing the hydraulic oil in the upper chamber to flow into the lower chamber.

3. The vacuum circuit breaker oil buffer deceleration device according to claim 2, characterized in that, The auxiliary oil holes are provided in multiple ways and are evenly distributed around the center of the piston.

4. The vacuum circuit breaker oil buffer deceleration device according to claim 2, characterized in that, The auxiliary oil hole is a stepped hole, and the section facing the lower cavity is the large diameter section, and the one-way valve is located in the large diameter section.

5. The vacuum circuit breaker oil buffer deceleration device according to claim 2, characterized in that, The main oil hole includes an axial section and a radial section that are interconnected. One end of the axial section is connected to the lower cavity, and one end of the radial section is connected to the upper cavity.

6. The vacuum circuit breaker oil buffer deceleration device according to claim 2, characterized in that, The check valve is a ball-type check valve.

7. The vacuum circuit breaker oil buffer deceleration device according to any one of claims 1-6, characterized in that, The piston and the rod are an integral structure.

8. The vacuum circuit breaker oil buffer deceleration device according to claim 1, characterized in that, The hydraulic cylinder includes a cylinder barrel and a cylinder cover disposed at the open end of the cylinder barrel, and the rod extends outward through the cylinder cover.

9. The vacuum circuit breaker oil buffer deceleration device according to claim 8, characterized in that, A sealed connection is formed between the cylinder head and the cylinder barrel, and a sealed connection is formed between the cylinder head and the rod body.

10. The vacuum circuit breaker oil buffer deceleration device according to claim 1, characterized in that, One end of the rod located outside the oil cylinder is connected to the transmission crank arm in the vacuum circuit breaker operating mechanism.

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