Working cylinder for driving device of power switch, driving device and power switch

Abstract

The utility model relates to a working cylinder for a driving device of a power switch, the driving device and the power switch. A working cylinder for a driving device of a power switch comprises a cylinder body, the cylinder body comprises a first end part, a second end part and a working channel extending from the first end part to the second end part; the cylinder cover covers the first end part of the cylinder body; the piston assembly comprises a piston rod and a piston connected with the piston rod, the piston is located in the working channel and is configured to move in a reciprocating mode along the working channel, and the end, opposite to the piston, of the piston rod penetrates through the cylinder cover; and the damping piece is arranged in the cylinder body, so that a damping effect is provided by the cylinder body in the cylinder body and the cylinder cover.

Description

Technical Field

[0001] The present disclosure relates to a working cylinder, and in particular to a working cylinder of a driving device for a power switch, a driving device, and a power switch. Background Art

[0002] In electrical switchgear, the power switch must interrupt the power transmission within a few milliseconds. Under this requirement, the driving device of the general power switch must transfer the kinetic energy required for switching the power switch to the power switch within a few milliseconds.

[0003] Typically, a circuit breaker is switched only a few times during its operating life (typically several decades for a circuit breaker), for example when a short circuit occurs. In this regard, the driver of the circuit breaker must exhibit both high transient reliability and low maintenance requirements.

[0004] In the prior art, since the damping function is set in the cylinder head, the material of the cylinder head must be made of steel or cast steel in order to meet the requirement of absorbing the damping pressure. Nowadays, the manufacturing process of the cylinder head is three steps: casting, pretreatment with coating, and finishing. As a result, high costs are incurred due to the production and manufacturing costs of the cylinder head, such as machine time, tool wear, material costs (alloys), surface protection, etc. Utility Model Content

[0005] Therefore, the object of the present disclosure is to provide a working cylinder for a driving device of an electrical power switch, wherein the cylinder head can be manufactured using a more economical material due to the damping function provided by the cylinder body, thereby significantly reducing the manufacturing cost of the working cylinder. In addition, the working cylinder provided by the present disclosure has durability under high operating conditions and can be advantageously combined with an existing driving device.

[0006] According to an embodiment of the first aspect of the present disclosure, a working cylinder for a drive device of a power switch is provided, characterized in that it comprises: a cylinder body, the cylinder body comprising a first end, a second end and a working channel extending from the first end toward the second end; a cylinder cover, the cylinder cover covering the first end of the cylinder body; a piston assembly, the piston assembly comprising a piston rod and a piston connected to the piston rod, wherein the piston is located in the working channel and is configured to be able to reciprocate along the working channel, and an end of the piston rod opposite to the piston passes through the cylinder cover; and a damping member, the damping member is arranged in the cylinder body so that a damping effect is provided by the cylinder body in the cylinder body and the cylinder cover.

[0007] It is understood that the main part of the working cylinder is formed by combining two separable components, namely the cylinder body and the cylinder head, and the materials used for the cylinder body and the cylinder head can be different. Advantageously, the cylinder head can be manufactured using economical materials to reduce the manufacturing costs of the working cylinder. In addition, the separate cylinder body can also be manufactured separately and almost independently of the material of the cylinder head. The possible working surface for the piston rod can be processed independently of the cylinder head. As a result, the working cylinder can be manufactured relatively easily in a modular manner and can be composed of two independently manufactured components.

[0008] The area of ​​the bottom of the cylinder cover is, for example, larger than the area of ​​the first end of the cylinder block, so that the cylinder cover covers the first end of the cylinder block and thereby seals the cylinder block.

[0009] The present disclosure thus provides a working cylinder for a drive device of a circuit breaker, which, after problem-free and cost-effective production, exhibits high operational durability and can be combined with existing drives without technical problems. The objects mentioned in the present disclosure are thus achieved.

[0010] In some embodiments, the circumferential profile of the cylinder head is designed so that the working pressure applied to the cylinder head is less than or equal to the system pressure of the drive device.

[0011] In this article, the system pressure of the drive device refers to the highest pressure of the drive device in the rated state. Generally, the working pressure of the system is generated by the power module of the drive device and is applied to the piston assembly to actuate the piston assembly, wherein the system pressure (rated pressure) is the highest value of the working pressure of the drive device. In some examples, the system pressure is equal to the pressure applied by the power module of the drive device to make the piston reciprocate in the working channel. In the case where the drive device is hydraulically driven, the power module can be, for example, a hydraulic pump.

[0012] The circumferential contour of the cylinder head is designed so that the working pressure applied to the cylinder head is less than or equal to the system pressure of the drive device, which means that when a damping function is set in the cylinder body, the working cylinder only needs to operate at the working pressure at the cylinder head, which reduces the material requirements for the cylinder head and can improve the cost-effectiveness of the entire working cylinder.

[0013] In some embodiments, the damping member is an inserted damping ring.

[0014] In some embodiments, the cylinder body and the cylinder head are detachably connected in a force-fit manner. The cylinder body and the cylinder head can be detachably connected in a force-fit manner, for example, by means of bolt threads. Thus, the cylinder body and the cylinder head can be fixedly connected to each other without moving relative to each other, and can be prevented from being lost.

[0015] In some embodiments, a locking member is further provided in the cylinder body, and the locking member cooperates with the piston rod so that the piston rod is kept in a predetermined position when the cylinder cover is removed from the cylinder body. When the cylinder cover is removed from the cylinder body, pressure loss in the cylinder body may occur. It is advantageous to provide a locking member in the cylinder body, and the locking member can keep the piston rod in a safe and reliable predetermined position to improve the reliability and stability of the entire working cylinder.

[0016] The locking member has various reasonable ways of cooperating with the piston rod. In some examples, the locking member can be, for example, a locking bolt. The locking member can cooperate with the piston rod in a manner that the piston rod is enclosed inside the locking member, such as by clamping with a notch, i.e., internal interlocking. Alternatively, the locking member can also cooperate with the piston rod and the locking member in other reasonable ways such as bolt fixing, i.e., external interlocking.

[0017] In some embodiments, the working cylinder further includes at least one energy storage component disposed on the cylinder cover, wherein the at least one energy storage component and the working cylinder are an integrated structure.

[0018] The number of the at least one energy storage element may be three, for example, and the at least one energy storage element does not need to be specially manufactured and pre-assembled.

[0019] In some embodiments, the material of the cylinder head includes aluminum. The material of the cylinder head including aluminum can significantly reduce the manufacturing cost of the cylinder head, which is beneficial to improving the cost-effectiveness of the entire working cylinder.

[0020] In some embodiments, a spacer having a through hole is disposed in the cylinder head, and the piston rod passes through the through hole of the spacer to be guided in the spacer.

[0021] In some embodiments, a partition closes the working channel to separate the working channel from a surrounding space outside the cylinder head.

[0022] The spacer may be, for example, a P-plug with a sealing structure. A flange plate or the like may also be advantageously provided in the cylinder head, the flange plate cooperating with the spacer (eg, P-plug) to keep the spacer in place.

[0023] According to an embodiment of the second aspect of the present disclosure, a drive device for a power switch is provided, comprising: a working cylinder according to any one of the aforementioned embodiments, wherein a piston rod of the working cylinder is used to manipulate a movable contact element of the power switch; and a spring member, which is arranged along the outer periphery of a cylinder body of the working cylinder.

[0024] By providing a spring member arranged along the outer circumference of the cylinder body of the working cylinder, the cylinder cover can be easily removed from the cylinder body without the need for additional independent equipment or components such as a spring press, which will save costs and facilitate the maintenance of the drive device. Advantageously, a piston rod is guided in the working cylinder, so that the accessible movable part of the electrical power switch can be reliably operated by the piston rod.

[0025] In some embodiments, the cylinder includes a first plate and a second plate disposed on the outer periphery of the cylinder, and the spring member is compressed between the first plate and the second plate. The first plate and the second plate of the cylinder can be disposed at positions close to the first end and the second end of the cylinder, respectively, so that there is a suitable distance between the first plate and the second plate to compress the spring member.

[0026] In some embodiments, the cylinder body includes a bottom plate disposed on the cylinder body, and the spring member is compressed between the bottom of the cylinder cover and the bottom plate.

[0027] In some examples, the bottom plate provided on the cylinder body can be formed by, for example, machining a groove around the outer circumference of the cylinder body at a position near the second end of the cylinder body, and providing a ring in the groove that matches the size of the groove as the bottom plate. The area of ​​the bottom of the cylinder head is larger than the area of ​​the first end of the cylinder body to a suitable extent, so as to provide a suitable mating surface required by the compression spring member.

[0028] According to an embodiment of a third aspect of the present disclosure, there is provided a power switch, comprising a driving device according to any one of the aforementioned embodiments.

[0029] The power switch has the various features and advantages described in the above embodiments, which will not be described in detail here.

[0030] These and other aspects of the disclosure will be apparent from and elucidated with reference to the embodiments described hereinafter. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0032] Figure 1 is a bottom view of a working cylinder of a driving device for an electrical power switch according to an embodiment of the present disclosure;

[0033] Figure 2 yes Figure 1 A top view of the working cylinder;

[0034] Figure 3 yes Figure 1 A front view of the working cylinder;

[0035] Figure 4 yes Figure 1 A cross-sectional view of the working cylinder along the ZZ direction.

[0036] Reference numerals list:

[0037] 1 Working cylinder

[0038] 2 Cylinder head

[0039] 3 Cylinder

[0040] 4 Bottom of cylinder head

[0041] 5. Cylinder body outer periphery

[0042] 6 Piston

[0043] 7 Piston rod

[0044] 8 First end

[0045] 9 Second end

[0046] 10 working channels

[0047] 11 Working surface

[0048] 12 Columnar notch

[0049] 13 Spacer

[0050] 14 Through Holes

[0051] 15 Flange plate

[0052] 16 Bolts DETAILED DESCRIPTION

[0053] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present disclosure. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0054] Figure 1 is a bottom view of a working cylinder of a driving device for an electrical power switch according to an embodiment of the present disclosure; Figure 2 yes Figure 1 A top view of the working cylinder; Figure 3 yes Figure 1 A front view of the working cylinder; Figure 4 yes Figure 1 A cross-sectional view of the working cylinder along the ZZ direction.

[0055] refer to Figure 1 and Figure 2 The cylinder body 3 and cylinder head 2 of the working cylinder 1 are Figure 1 and Figure 2 can have a generally circular shape in the view of. Figure 3 and Figure 4 The overall shape of the cylinder body 3 and the cylinder head 2 can be cylindrical.

[0056] exist Figure 3 and Figure 4 As can be seen in the figure, the working cylinder 1 includes a cylinder body 3 and a cylinder head 2, and a piston 6 and a piston rod 7 form a piston assembly. The cylinder body 3 includes a first end 8, a second end 9, and a working channel 10 extending from the first end 8 toward the second end 9; the cylinder head 2 covers the first end 8 of the cylinder body 3. The piston 6 is located in the working channel 10 and is configured to be able to reciprocate along the working channel 10, and the end of the piston rod 7 opposite to the piston 6 passes through the cylinder head 2.

[0057] In addition, a damping element (not shown in the figure) is arranged in the cylinder 3, so that the damping effect is provided by the cylinder 3 in the cylinder 3 and the cylinder head 2. Since the damping function is provided in the cylinder 3, only the working pressure needs to be operated at the cylinder head 2.

[0058] The working channel 10 has a working surface 11. In some examples, the working surface 11 corresponds to the shape of the outer peripheral surface of the piston 6, and the piston 6 contacts the working surface 11 of the working channel 10 and reciprocates in the working channel 10. The piston 6 can be an energy storage piston, for example, an energy storage piston is realized by attaching a spring to the piston 6.

[0059] The piston rod 7 is in contact with the cylinder cover 6. As a result, the piston rod 7 is guided at least at two locations in the working cylinder, namely in the cylinder body 3 on the one hand and in the cylinder cover 3 on the other hand, thereby avoiding tilting or tilting of the piston rod. The piston rod 7 is positioned coaxially with the working cylinder 1 and is accommodated in the central working channel 10 of the working cylinder. As a result, the piston rod 7 can be easily pushed into the working cylinder 1 from one side. The piston rod 7 moves up and down in the working cylinder 1 and operates the movable part of the power switch that is not shown and can be touched by the piston rod 7.

[0060] like Figure 3 and Figure 4 As shown, the cylinder body 3 and the cylinder head 2 are detachably connected by force fit via bolts 16. A locking member is also provided in the cylinder body 3, and the locking member (not shown in the figure) cooperates with the piston rod 7 so that when the cylinder head 2 is removed from the cylinder body 3, the piston rod 7 is kept in a predetermined position.

[0061] A spacer 13 having a through hole 14 is provided in the cylinder head 2, and the piston rod 7 passes through the through hole 14 of the spacer 13 to be guided in the spacer 13. The spacer 13 closes the working channel 10 to separate the working channel 10 from the surrounding space outside the cylinder head. The spacer 13 can be, for example, a P-plug with a sealing structure. A flange plate 15 or the like can also be advantageously provided in the cylinder head, and the flange plate 15 cooperates with the spacer 13 (for example, a P-plug) to keep the spacer 13 in place.

[0062] In a drive device for a power switch including a working cylinder 1 (not shown in the figure), the bottom 4 of the cylinder cover 2 can have an area that is appropriately larger than the first end 8 of the cylinder body 3 to provide a suitable mating surface required by a compression spring member (not shown in the figure).

[0063] In some examples, the cylinder head 2 has a columnar recess 12, and the cylinder body 3 is partially accommodated in the recess 12. The provision of the recess 12 makes the positioning and matching between the cylinder head and the cylinder body stable and not prone to misalignment. Figure 4 As shown, the cylinder head 3 can also have a stepped outer peripheral surface.

[0064] It can be understood that various components can be attached to the side surface and / or end surface of the cylinder head 2 .

[0065] This specification provides different embodiments or examples that can be used to implement the present disclosure. It should be understood that these different embodiments or examples are purely exemplary and are not intended to limit the scope of protection of the present disclosure in any way. Those skilled in the art can conceive of various changes or replacements based on the disclosure of the specification of the present disclosure, which should all be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection defined by the attached claims.

Claims

1. A working cylinder for a drive device of a power switch, characterized in that: include: a cylinder body, the cylinder body comprising a first end, a second end, and a working channel extending from the first end toward the second end; a cylinder head, the cylinder head covering the first end of the cylinder body; A piston assembly, the piston assembly comprising a piston rod and a piston connected to the piston rod, wherein the piston is located in the working channel and is configured to be able to reciprocate along the working channel, and an end of the piston rod opposite to the piston passes through the cylinder cover; as well as A damping member is arranged in the cylinder block so that a damping effect is provided by the cylinder block in the cylinder block and the cylinder head.

2. The working cylinder according to claim 1, characterized in that: The circumferential contour of the cylinder head is designed so that the working pressure applied to the cylinder head is less than or equal to the system pressure of the drive device.

3. The working cylinder according to claim 2, characterized in that: The damping member is an inserted damping ring.

4. The working cylinder according to any one of claims 1 to 3, characterized in that: The cylinder body is detachably connected to the cylinder cover in a force-fitting manner.

5. The working cylinder according to any one of claims 1 to 3, characterized in that: A locking member is also provided in the cylinder body, and the locking member cooperates with the piston rod so that the piston rod is kept in a predetermined position when the cylinder cover is removed from the cylinder body.

6. The working cylinder according to any one of claims 1 to 3, characterized in that: The working cylinder further comprises at least one energy storage component arranged on the cylinder cover, wherein the at least one energy storage component and the working cylinder are an integrated structure.

7. The working cylinder according to any one of claims 1 to 3, characterized in that: The material of the cylinder head includes aluminum.

8. The working cylinder according to any one of claims 1 to 3, characterized in that: A spacer having a through hole is disposed in the cylinder head, and the piston rod passes through the through hole of the spacer to be guided in the spacer.

9. The working cylinder according to claim 8, characterized in that: The partition closes the working channel to separate the working channel from a surrounding space outside the cylinder head.

10. A driving device for a power switch, characterized in that: include: The working cylinder according to any one of claims 1 to 9, wherein a piston rod of the working cylinder is used to operate a movable contact element of the power switch; as well as A spring member is arranged along the outer circumference of a cylinder body of the working cylinder.

11. The driving device according to claim 10, characterized in that: The cylinder block includes a first plate and a second plate provided on an outer periphery of the cylinder block, and the spring member is compressed between the first plate and the second plate.

12. The driving device according to claim 10, characterized in that: The cylinder body includes a bottom plate disposed on the cylinder body, and the spring member is compressed between the bottom of the cylinder cover and the bottom plate.

13. A power switch, characterized in that: Comprising a drive device according to any one of claims 10 to 12.

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