Vacuum arc-extinguishing chamber structure and switchgear
By installing a limiting groove and a boss in the vacuum arc extinguishing chamber of the vacuum contactor, the rotation of the second conductive rod is limited, and the problem of difficult to ensure the contact opening distance and the twisting of the bellows is solved, and the service life and reliability of the equipment are improved.
Patent Information
- Application Number
- CN202421275108.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-05
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-06-05
AI Technical Summary
In the vacuum arc extinguishing chamber of existing vacuum contactors, the contact opening distance is difficult to ensure, and the corrugated pipe is easily twisted during the adjustment of the opening distance, resulting in a decrease in vacuum degree and a decrease in life.
By opening a limit groove on the adjustment end of the second conductive rod and a limit boss on the base, the second conductive rod cannot rotate about its axis, limit its rotation, and avoiding the torsional influence on the bellows.
It effectively avoids damage to corrugated pipes, improves the service life and reliability of the vacuum arc extinguishing chamber, and simplifies the structure, reduces parts, and improves the convenience of production and assembly.
Smart Images
Figure CN222600787U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of low-voltage electrical appliances, in particular to a vacuum interrupter structure and a switch device. Background Art
[0002] Contactors are electrical appliances used to frequently connect and disconnect AC and DC main circuits and large-capacity control circuits over long distances. Their main control object is the motor, and they can also control other power loads, such as electric heaters, lighting lamps, electric welding machines, capacitor banks, etc. With the development of the new energy industry, high-current contactors have been widely used in the AC side of the grid-connected converters in the wind power industry in recent years, especially vacuum contactors, whose contact system and arc extinguishing system are integrated in the vacuum interrupter, which has the advantages of no arc spray, high voltage resistance, strong breaking capacity, and long electrical life, and is particularly suitable for harsh environments. However, vacuum contactors also have some disadvantages, such as: regardless of the size of the contactor frame, the contact opening distance and tolerance range of the vacuum interrupter are small, with a typical value of 2.5±0.5. Since the contact opening distance is the assembly size, it is affected by the dimensional accuracy of other components. The larger the contactor frame, the larger the size of other components, and the more difficult it is to ensure the dimensional accuracy, which leads to the difficulty in ensuring the contact opening distance of the vacuum interrupter after direct assembly.
[0003] The existing contactor technology to solve the above shortcomings is usually to design the contact opening distance to be adjustable, and to change the opening distance by adjusting the position of the second conductive rod. However, in the process of opening distance adjustment, it is usually necessary to screw the adjusting screw on the second conductive rod, which will cause the second conductive rod to be subjected to a torsional force and to be twisted circumferentially, thereby causing a twisting effect on the bellows in the vacuum interrupter, resulting in a decrease in the vacuum degree of the vacuum interrupter and a shortened service life. Summary of the invention
[0004] The utility model aims to overcome at least one defect of the prior art and provide a vacuum interrupter structure and a switch device.
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] A vacuum arc extinguishing chamber structure comprises a base, a vacuum arc extinguishing chamber, a conductive bar and a soft connection, wherein the conductive bar is fixed on the base, and the vacuum arc extinguishing chamber comprises a vacuum shell, a first conductive rod and a second conductive rod, wherein the first conductive rod is fixed in the vacuum shell and electrically connected to the soft connection, wherein one end of the second conductive rod is arranged in the vacuum shell along its axial movement and is arranged opposite to the first conductive rod, wherein one end of the second conductive rod is provided with a second contact which matches with the first contact on the first conductive rod, and the other end of the second conductive rod is an adjustment end connected to the conductive bar, wherein a limiting groove is provided on the adjustment end of the second conductive rod, and a limiting boss is provided on the base, wherein the limiting groove matches with the limiting boss so that the second conductive rod cannot rotate around its axis.
[0007] Optionally, the adjustment end of the second conductive rod is provided with two limit grooves located on both sides of the radial direction, a limit portion is formed between the two limit grooves, and two limit bosses corresponding to the two limit grooves are provided on the base, and the upper limit portion is limited between the two limit bosses in the rotation direction of the second conductive rod.
[0008] Optionally, the limiting boss is a square block structure; the limiting groove has two side walls connected vertically, and the two side walls are sliding surfaces that slide with the limiting boss in the axial direction of the second conductive rod and stop surfaces that resist against the limiting boss in the axial direction of the second conductive rod.
[0009] Optionally, an adjustment tool is also included, which includes a positioning plate and an adjustment screw. The positioning plate is installed on the base and the conductive bar, and is located on the side of the adjustment end of the second conductive rod away from the first conductive rod. The adjustment screw is screwed on the positioning plate, and its screw end is arranged opposite to the adjustment end of the second conductive rod. The adjustment end of the second conductive rod is provided with a threaded hole that cooperates with the adjustment screw.
[0010] Optionally, the bottom end of the positioning plate is provided with a supporting notch in the middle and two supporting feet on both sides, the supporting notch of the positioning plate is disposed on the conductive bar, and the two supporting feet of the positioning plate are placed on the base.
[0011] Optionally, the adjustment end of the second conductive rod is fixed to the conductive bar through a clamping assembly, the clamping assembly includes a clamping piece and a clamping screw, the middle part of the clamping piece has a clamping protrusion protruding downward, the adjustment end of the second conductive rod is placed on the inner end of the conductive bar, the clamping protrusion in the middle part of the clamping piece is pressed on the adjustment end, and the two ends of the clamping piece are placed on the inner end of the conductive bar and fixedly connected by the clamping screw.
[0012] Optionally, the end of the first conductive rod away from the second conductive rod is an actuated end extending out of the vacuum shell, the actuated end of the first conductive rod cooperates with a rocker arm of a switch device for driving the opening and closing of the switch, and a contact spring is provided between the actuated end and the rocker arm.
[0013] Optionally, the rocker arm is driven and connected to the driven end of the first conductive rod through a spring seat and a contact spring, the rocker arm is provided with a mounting groove, the spring seat is clamped in the mounting groove, and is fixedly connected to the rocker arm through a fixing screw and a gasket, the spring seat is provided with a fixing screw hole that cooperates with the fixing screw; a sleeve is provided between the spring seat and the driven end, one end of the sleeve is clamped into the clamping hole of the spring seat, and has an axial hole for the fixing screw to pass through; the contact spring is sleeved on the sleeve, one end of which is connected to the driven end of the first conductive rod, and the other end is connected to the spring seat.
[0014] A switchgear comprising any of the vacuum interrupter structures described above.
[0015] Optionally, the switching device is a contactor.
[0016] The vacuum interrupter structure and switch device of the utility model limit the rotation of the second conductive rod by cooperating between the limiting boss on the base and the limiting groove on the second conductive rod, thereby avoiding possible damage to the bellows and improving the service life and reliability of the vacuum interrupter; moreover, the limiting boss is integrally arranged on the base, reducing parts and simplifying the structure.
[0017] In addition, the second conductive rod is prevented from rotating by the cooperation of two notched limiting grooves on both sides of the radial direction of the second conductive rod and two limiting bosses, which has a simple structure, low precision requirements, and is easy to manufacture and assemble. Moreover, the cooperation structure between the limiting groove and the limiting boss adopts plane-to-plane cooperation, which makes the limiting stable and reliable, and easy to construct and shape.
[0018] In addition, the contact spacing is adjustable and can be accurately measured to meet the contact spacing requirements of the usage scenario. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a three-dimensional diagram of the vacuum interrupter part of the switchgear of the utility model;
[0020] Figure 2 This utility model Figure 1 A magnified view of the local structure in
[0021] Figure 3 It is a cross-sectional view of the vacuum interrupter of the switchgear of the utility model;
[0022] Figure 4 This is a view of the vacuum interrupter section of the switchgear of the utility model;
[0023] Figure 5 This utility model Figure 4 A magnified view of the local structure.
[0024] Base 1; limiting boss 101; vacuum arc chamber 2; vacuum shell 21; first conductive rod 22; second conductive rod 23; limiting groove 231; limiting portion 232; sliding surface 233; stop surface 234; first contact 24; second contact 25; conductive row 3; positioning plate 4; supporting notch 401; supporting foot 402; adjusting screw 5; clamping piece 6; clamping protrusion 601; clamping screw 7; flexible connection 8; rocker arm 9; mounting groove 90; limiting side wall 901; resisting protrusion 902; contact spring 10; spring seat 11; sleeve 12; fixing screw 13; gasket 14. DETAILED DESCRIPTION
[0025] The following embodiments are given in conjunction with the accompanying drawings to further illustrate the specific implementation of the vacuum interrupter structure and switchgear of the present utility model. The vacuum interrupter structure and switchgear of the present utility model are not limited to the description of the following embodiments.
[0026] like Figure 1 and Figure 3 As shown, the switch device of this embodiment is a contactor, including a vacuum arc chamber structure. Of course, the switch device can also be a circuit breaker, etc. The vacuum arc chamber structure includes a base 1, a vacuum arc chamber 2, a conductive bar 3, and a soft connection 8. The conductive bar 3 is fixed on the base 1, and the vacuum arc chamber 2 is connected in series to the main circuit of the switch device through the conductive bar 3 and the soft connection 8. The vacuum arc chamber 2 includes a vacuum shell 21, a first conductive rod 22 and a second conductive rod 23. One end of the second conductive rod 23 is arranged in the vacuum shell 21 along its axial movement and is arranged opposite to the first conductive rod 22. One end of the second conductive rod 23 is provided with a second contact 25 that matches the first contact 24 on the first conductive rod 22, and the other end of the second conductive rod 23 is an adjustment end connected to the conductive bar 3. One end of the first conductive rod 22 is fixed in the vacuum housing 21, and is provided with a first contact 24 that matches with a second contact 25 on the second conductive rod 23. The other end of the first conductive rod 22 away from the second conductive rod 23 is a passive end extending out of the vacuum housing 21. The passive end of the first conductive rod 22 is electrically connected to the soft connection 8, and is driven and matched with a rocker arm 9 for driving the switchgear to open and close. A contact spring 10 is provided between the passive end of the first conductive rod 22 and the rocker arm 9. The rocker arm 9 drives the first conductive rod 22 of the vacuum interrupter 2 to move, thereby completing the opening and closing function of the switchgear.
[0027] like Figure 3 As shown, the switch device is in the open state. When the control circuit of the switch device is energized, the rocker arm 9 rotates counterclockwise, driving the first conductive rod 22 to move leftward until the first contact 24 contacts the second contact 25, thereby closing the switch device. When the control circuit of the switch device is de-energized, the rocker arm 9 rotates clockwise, driving the first conductive rod 22 to move rightward until the first contact 24 contacts the second contact 25, thereby closing the switch device. Figure 3 The first contact 24 shown in the figure is disconnected from the second contact 25, and the switch device is opened. Figure 3The gap between the first contact 24 and the second contact 25 shown is the set contact opening distance. It should be noted that the control circuit of the switch device in this embodiment and the structure and operation principle of the action mechanism including the rocker arm 9 are prior art and will not be repeated here. The vacuum arc chamber 2 in this embodiment is an independent component, the first conductive rod 22 and the vacuum shell 21 are welded and fixed, usually called a static conductive rod, and the second conductive rod 23 can move axially in the vacuum shell 21, usually called a dynamic conductive rod. For example, when adjusting the contact opening distance, the first conductive rod 22 and the vacuum shell 21 are stationary, and the second conductive rod 23 is moved axially in the vacuum shell 21 to change the contact opening distance; but when the switch device is opened and closed, the first conductive rod 22 and the vacuum shell 21 move synchronously, while the second conductive rod 23 is stationary.
[0028] An improvement of the present application is that a limiting groove 231 is provided on the adjustment end of the second conductive rod 23, and a limiting boss 101 is provided on the base 1, and the limiting groove 231 cooperates with the limiting boss 101 to prevent the second conductive rod 23 from rotating around its axis. The vacuum arc chamber structure and switch device of this embodiment, through the cooperation of the limiting boss 101 on the base 1 and the limiting groove 231 on the second conductive rod 23, realizes limiting the rotation of the second conductive rod 23, avoids possible damage to the bellows, and improves the service life and reliability of the vacuum arc chamber 2. The limiting boss 101 in this embodiment is integrally arranged on the base 1, reducing parts and simplifying the structure. Of course, as other embodiments, the limiting boss 101 can also be an independent limiting part.
[0029] like Figure 1 and Figure 2As shown, the specific limiting structure of the second conductive rod 23 of this embodiment, the adjustment end of the second conductive rod 23 is provided with two limiting grooves 231 located on both sides of the radial direction, and a limiting portion 232 is formed between the two limiting grooves 231, and the base 1 is provided with two limiting bosses 101 corresponding to the two limiting grooves 231, and the upper limiting portion 232 is limited between the two limiting bosses 101 in the rotation direction of the second conductive rod 23 so that the second conductive rod 23 can move along its axial direction but cannot rotate around its axis. Specifically, the limiting boss 101 is a square block structure; the limiting groove 231 has two side walls connected vertically, and the two side walls are a sliding surface 233 that slides with the limiting boss 101 in the axial direction of the second conductive rod 23 and a stop surface 234 that resists and cooperates with the limiting boss 101 in the axial direction of the second conductive rod 23. In this embodiment, the second conductive rod 23 is prevented from rotating by cooperating with two notch-type limiting grooves 231 on both sides of the radial direction of the second conductive rod 23 and two limiting bosses 101. The structure is simple, the precision requirement is not high, and it is easy to manufacture and assemble. Moreover, the matching structure between the limiting groove 231 and the limiting boss 101 adopts plane-to-plane matching, so that the limiting is stable and reliable, and it is easy to construct and shape. Of course, as other embodiments, a single limiting groove 231 and a single limiting boss 101, or three or more limiting grooves 231 and corresponding multiple limiting bosses 101 can also be set, the limiting groove 231 has two opposite side walls, and the limiting boss 101 is inserted in the limiting groove 231 so that the two opposite side walls of the limiting groove 231 in the rotation direction of the second conductive rod 23 are limited to the two sides of the limiting boss 101.
[0030] Another improvement of the present application is that Figure 1 and Figure 2As shown, the vacuum arc chamber structure of this embodiment also includes an adjustment tool, which includes a positioning plate 4 and an adjustment screw 5. The positioning plate 4 is installed on the base 1 and the conductive bar 3, and is located on the side of the adjustment end of the second conductive rod 23 away from the first conductive rod 22 (that is, the positioning plate 4 and the first conductive rod 22 are located on both sides of the axial direction of the second conductive rod 23). The adjustment screw 5 is screwed on the positioning plate 4, and its screw end is arranged opposite to the adjustment end of the second conductive rod 23. The adjustment end of the second conductive rod 23 is provided with a threaded hole that cooperates with the adjustment screw 5. Specifically, the bottom end of the positioning plate 4 is provided with a support notch 401 located in the middle and two support feet 402 located on both sides. The support notch 401 of the positioning plate 4 is disposed on the conductive bar 3, and the two support feet 402 of the positioning plate 4 are placed on the base 1. The adjusting screw 5 passes through the positioning plate 4 in the thickness direction of the positioning plate 4 and is screwed into the threaded hole on the second conductive rod 23. By reasonably designing the length of the adjusting screw 5, the thickness of the positioning plate 4, and the depth of the threaded hole, the adjusting screw 5 can be screwed in to pull the second conductive rod 23 apart to a set contact opening distance, and the opening distance value can be measured by a vernier caliper or other tools. The contact opening distance of this embodiment is adjustable and can be accurately measured to meet the contact opening distance required by the usage scenario.
[0031] After the contact opening distance is adjusted, the second conductive rod 23 needs to be fixed. Figure 1 and Figure 2 As shown, the fixing structure of the conductive rod 23 of this embodiment, the adjustment end of the second conductive rod 23 is fixed on the conductive bar 3 through a clamping assembly, the outer end of the conductive bar 3 extends out of the base 1, the inner end of the conductive bar 3 is fixed in the base 1, and the inner end of the conductive bar 3 is provided with a support groove matched with the adjustment end; the clamping assembly includes a clamping member 6 and a clamping screw 7, the middle part of the clamping member 6 has a downwardly protruding clamping protrusion 601, the bottom end of the clamping protrusion 601 has a clamping groove matched with the adjustment end, the adjustment end of the second conductive rod 23 is placed in the support groove on the inner end of the conductive bar 3, the clamping protrusion 601 in the middle part of the clamping member 6 is pressed on the adjustment end through the clamping groove thereon, and the two ends of the clamping member 6 are placed on the inner end of the conductive bar 3 and fixedly connected by the clamping screw 7. The second conductive rod 23 is a cylindrical structure, and accordingly, the support groove and the clamping groove both have arc-shaped side walls. The conductive rod 23 is pressed onto the conductive bar 3 by the pressing piece 6 and the pressing piece 6 is fixed to the conductive bar 3 by the pressing screw 7. The structure is simple and the disassembly and assembly are convenient. The conductive rod 23 is firmly and reliably installed.
[0032] like Figure 4 and Figure 5As shown, in this embodiment, the driving structure between the rocker arm 9 and the first conductive rod 22, the rocker arm 9 is drivingly connected to the driven end of the first conductive rod 22 through the spring seat 11 and the contact spring 10, the rocker arm 9 is provided with a mounting groove 90, the spring seat 11 is clamped in the mounting groove 90, and is fixedly connected to the rocker arm 9 through a fixing screw 13 and a gasket 14, the spring seat 11 is provided with a fixing screw hole matched with the fixing screw 13; a sleeve 12 is provided between the spring seat 11 and the driven end, one end of the sleeve 12 is clamped in the clamping hole of the spring seat 11, and has an axial hole for the fixing screw 13 to pass through. Specifically, the spring seat 11 has a large end, a small end and two shoulders arranged on both sides of the connection between the large end and the small end; the mounting groove 90 has two opposite limiting side walls 901, and the two limiting side walls 901 protrude in the direction of approaching each other to form two abutting protrusions 902. The large end of the spring seat 11 is limited between the two limiting side walls 901, and the small end is limited between the two abutting protrusions 902. The two shoulders abut against the two abutting protrusions 902, and the abutting protrusions 902 are located between the shoulder of the spring seat 11 and the gasket 14. The contact spring 10 is sleeved on the sleeve 12, one end of which is connected to the actuated end of the first conductive rod 22, and the other end of which is connected to the large end of the spring seat 11. The structure of the actuated end of the first conductive rod 22 and the large end of the spring seat 11 for connecting the contact spring 10 is a plane, a groove or a protrusion.
[0033] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate directions or positional relationships based on directions or positional relationships shown in the drawings, or directions or positional relationships that are usually placed when in use, and are only for the convenience of description, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions, and cannot be understood as indicating relative importance.
[0034] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.
Claims
1. A vacuum interrupter structure, comprising a base (1), a vacuum interrupter (2), a conductive bar (3), and a flexible connection (8), wherein the conductive bar (3) is fixed on the base (1), the vacuum interrupter (2) comprises a vacuum housing (21), a first conductive rod (22), and a second conductive rod (23), wherein the first conductive rod (22) is fixed in the vacuum housing (21) and is electrically connected to the flexible connection (8), one end of the second conductive rod (23) is arranged in the vacuum housing (21) in an axially movable manner and is arranged opposite to the first conductive rod (22), one end of the second conductive rod (23) is provided with a second contact (25) that matches a first contact (24) on the first conductive rod (22), and the other end of the second conductive rod (23) is an adjustment end connected to the conductive bar (3), characterized in that: A limiting groove (231) is provided on the adjustment end of the second conductive rod (23), and a limiting boss (101) is provided on the base (1). The limiting groove (231) cooperates with the limiting boss (101) to prevent the second conductive rod (23) from rotating around its axis.
2. The vacuum interrupter structure according to claim 1, characterized in that: The adjustment end of the second conductive rod (23) is provided with two limiting grooves (231) located on both sides in the radial direction, a limiting portion (232) is formed between the two limiting grooves (231), and the base (1) is provided with two limiting bosses (101) corresponding to the two limiting grooves (231), and the upper limiting portion (232) is limited between the two limiting bosses (101) in the rotation direction of the second conductive rod (23).
3. The vacuum interrupter structure according to claim 2, characterized in that: The limiting boss (101) is a square block structure; the limiting groove (231) has two side walls connected vertically, and the two side walls are a sliding surface (233) that slides with the limiting boss (101) in the axial direction of the second conductive rod (23) and a stop surface (234) that resists with the limiting boss (101) in the axial direction of the second conductive rod (23).
4. The vacuum interrupter structure according to claim 1, characterized in that: The invention also comprises an adjusting tool, wherein the adjusting tool comprises a positioning plate (4) and an adjusting screw (5), wherein the positioning plate (4) is mounted on the base (1) and the conductive bar (3), and is located on a side of the adjusting end of the second conductive rod (23) away from the first conductive rod (22), and the adjusting screw (5) is screwed on the positioning plate (4), and the end of the screw is arranged opposite to the end of the adjusting end of the second conductive rod (23), and a threaded hole matching the adjusting screw (5) is provided on the end of the adjusting end of the second conductive rod (23).
5. The vacuum interrupter structure according to claim 4, characterized in that: The bottom end of the positioning plate (4) is provided with a supporting notch (401) located in the middle and two supporting feet (402) located on both sides; the supporting notch (401) of the positioning plate (4) is disposed on the conductive bar (3), and the two supporting feet (402) of the positioning plate (4) are placed on the base (1).
6. The vacuum interrupter structure according to claim 1, characterized in that: The adjusting end of the second conductive rod (23) is fixed to the conductive bar (3) via a clamping assembly, wherein the clamping assembly comprises a clamping piece (6) and a clamping screw (7), wherein the middle portion of the clamping piece (6) has a clamping protrusion (601) protruding downward, the adjusting end of the second conductive rod (23) is placed on the inner end of the conductive bar (3), the clamping protrusion (601) in the middle portion of the clamping piece (6) is pressed on the adjusting end, and the two ends of the clamping piece (6) are placed on the inner end of the conductive bar (3) and are fixedly connected via the clamping screw (7).
7. The vacuum interrupter structure according to claim 1, characterized in that: One end of the first conductive rod (22) away from the second conductive rod (23) is an actuated end extending outside the vacuum housing (21); the actuated end of the first conductive rod (22) cooperates with a rocker arm (9) of a switch device for driving the opening and closing of the switch; a contact spring (10) is provided between the actuated end and the rocker arm (9).
8. The vacuum interrupter structure according to claim 7, characterized in that: The rocker arm (9) is drivingly connected to the driven end of the first conductive rod (22) through a spring seat (11) and a contact spring (10); a mounting groove (90) is provided on the rocker arm (9); the spring seat (11) is clamped in the mounting groove (90) and fixedly connected to the rocker arm (9) through a fixing screw (13) and a gasket (14); a fixing screw hole matched with the fixing screw (13) is provided on the spring seat (11); a sleeve (12) is provided between the spring seat (11) and the driven end; one end of the sleeve (12) is clamped in the clamping hole of the spring seat (11) and has an axial hole for the fixing screw (13) to pass through; the contact spring (10) is sleeved on the sleeve (12), one end of which is connected to the driven end of the first conductive rod (22) and the other end of which is connected to the spring seat (11).
9. A switchgear, characterized in that: It comprises the vacuum arc extinguishing chamber structure as described in any one of claims 1-8.
10. The switchgear according to claim 9, characterized in that: The switching device is a contactor.