WO2015128435A1

WO2015128435A1 - Mechanical linkage circuit breaker

Info

Publication number: WO2015128435A1
Application number: PCT/EP2015/054077
Authority: WO
Inventors: Thomas Chyla; Yin Chuan JIA; Xian Yong ZHOU
Original assignee: Siemens Aktiengesellschaft
Priority date: 2014-02-27
Filing date: 2015-02-26
Publication date: 2015-09-03
Also published as: EP3111460A1; RU2641308C1; CN104882338B; EP3111460B1; CN104882338A; MX371352B; MX2016010988A

Abstract

The present invention relates to a mechanical linkage circuit breaker, comprising a crossbeam and a pull rod, wherein the pull rod is disposed in the crossbeam. The mechanical linkage circuit breaker also comprises a guiding means. The guiding means comprises two load-bearing elements and two guide sleeves, wherein the load-bearing elements are fixed to the crossbeam and located on two sides of the pull rod. The guide sleeves surround the load-bearing elements, respectively, in a rotatable fashion and are spaced apart from the pull rod. Such a mechanical linkage circuit breaker has high reliability and stability.

Description

Mechanical linkage circuit breaker Technical field

The present invention relates to a mechanical linkage circuit breaker, in particular to a three-phase mechanical linkage high-voltage circuit breaker with a guiding means.

Background art

A circuit breaker is an important switch device in an electrical system, and is responsible for two tasks, namely control and protection. Its performance plays a major role in determining whether the electrical system can operate safely. As people demand higher quality in the supply of power, the reliability and stability of circuit breakers are subject to ever higher requirements. This is particularly true in the case of mechanical linkage circuit breakers, the actuating mechanism of which is an important constituent part thereof, one of the key components which determine the opening/closing performance of the mechanical linkage circuit breaker. The performance of the actuating mechanism is directly related to the performance of the mechanical linkage circuit breaker.

In existing mechanical linkage circuit breakers, the large distance between phases often means that the pull rod is excessively long. The pull rod readily deforms and becomes unstable when driven by the actuating mechanism, and this has an impact on the mechanical properties of the mechanical linkage circuit breaker. A solution is urgently needed to the problem of how to increase the reliability and stability of motion transfer by the pull rod without changing its shape or material so as to meet the relevant mechanical property requirements, and guarantee the reliability and stability of the mechanical linkage circuit breaker. Content of the invention

The object of the present invention is to provide a mechanical linkage circuit breaker with high reliability and stability. Such a mechanical linkage circuit breaker comprises a crossbeam and a pull rod, wherein the pull rod is disposed in the crossbeam. The mechanical linkage circuit breaker also comprises a guiding means. The guiding means comprises two load-bearing elements and two guide sleeves, wherein the load- bearing elements are fixed to the crossbeam and located on two sides of the pull rod. The guide sleeves surround the load- bearing elements, respectively, in a rotatable fashion and are spaced apart from the pull rod.

According to one aspect of the present invention, the two load- bearing elements are bolts, and the guide sleeves are tubular.

According to another aspect of the present invention, the guiding means also comprises two first washers disposed between the load-bearing elements and the crossbeam.

According to another aspect of the present invention, the guiding means also comprises two nuts, and the load-bearing elements screw into the corresponding nuts after passing through the corresponding guide sleeves.

According to another aspect of the present invention, the guiding means also comprises two bushes disposed between the load-bearing elements and the guide sleeves.

According to another aspect of the present invention, the guiding means also comprises two second washers disposed between the nuts and the bushes.

According to another aspect of the present invention, the guiding means also comprises a frame, with a channel inside the frame, and the guide sleeves disposed in the channel. Two through-holes are formed on one side of the frame, while two threaded holes are formed on the opposite side. The load- bearing elements are screwed into the corresponding threaded holes after passing through the crossbeam, the corresponding through-holes and the corresponding guide sleeves in sequence.

According to another aspect of the present invention, the frame is made of metal.

According to another aspect of the present invention, the two guide sleeves are made of Teflon.

In the mechanical linkage circuit breaker of the present invention, two load-bearing elements are installed on the crossbeam and located on two sides of the pull rod, while two guide sleeves surround the two load-bearing elements, respectively, in a rotatable fashion and are spaced apart from the pull rod. This arrangement can not only prevent deformation and destabilization of the pull rod, but also reduce friction caused by relative movement between the guide sleeves and the pull rod, thereby reducing wear of the guide sleeve material. Not only is it ensured that the distance between each guide sleeve and the pull rod is within a certain range in order to guarantee the reliability and stability of the mechanical linkage circuit breaker, but costs are also reduced. In addition, the guiding means is easy to install and avoids jamming, etc. which might occur in the course of operation.

The above description is merely an outline of the technical solution of the present invention. In order to enable a clearer understanding of the technical approaches of the present invention so that implementation according to the content of the description is possible, and to make the above and other objects, features and advantages of the present invention clearer and easier to understand, preferred embodiments are explained in detail below in conjunction with the accompanying drawings .

Description of the accompanying drawings

Fig. 1 is a schematic diagram of the mechanical linkage circuit breaker of the present invention;

Fig. 2 is a schematic diagram of an embodiment of a guiding means of the present invention for the mechanical linkage circuit breaker shown in Fig. 1 ;

Fig. 3 is a schematic diagram of another embodiment of a guiding means of the present invention for the mechanical linkage circuit breaker shown in Fig. 1.

The labels in the accompanying drawings comprise:

100 mechanical linkage circuit breaker

110 crossbeam

120 first phase

130 second phase

140 third phase

150 pull rod

160, 160a, 160b guiding means

163a, 163b load-bearing elements

164a, 164b guide sleeves

1630 first washer

165 bush

171 second washer

175 frame

1751 through-hole

1753 channel

1756 threaded hole

170 nut

1651 bush limiter Particular embodiments

The present invention is explained in further detail below in conjunction with the accompanying drawings and embodiments, to clarify the technical problem to be solved thereby as well as the technical solution and beneficial effects thereof. It should be understood that the particular embodiments described here are only intended to explain the present invention, not to define it.

Fig. 1 shows a schematic diagram of a mechanical linkage circuit breaker 100 of the present invention. As shown in Fig. 1, the mechanical linkage circuit breaker 100 comprises a crossbeam 110, a first phase 120, a second phase 130, a third phase 140, a pull rod 150 and a guiding means 160. The first phase 120, second phase 130 and third phase 140 are disposed on the crossbeam 110. The pull rod 150 is disposed in the crossbeam 110 and connects the adjacent first phase 120 and second phase 130 together, and the second phase 130 and third phase 140 together. The guiding means 160 is also disposed in the crossbeam 110 and is used to guide the pull rod 150. In various embodiments of the present invention, the number and position of the guiding means 160 may be varied according to the actual application; for example, one guiding means 160 may be provided between the first phase 120 and second phase 130, while another guiding means 160 is provided between the second phase 130 and third phase 140, or a greater number of guiding means 160 may be used. The guiding means 160 comprises two load-bearing elements and two guide sleeves. For example, in the embodiment shown in Fig. 2, the guiding means 160a comprises two load-bearing elements 163a and two guide sleeves 164a, or in the embodiment shown in Fig. 3, the guiding means 160b comprises two load-bearing elements 163b and two guide sleeves 164b. The guide sleeves 164a and 164b can rotate relative to the load-bearing elements 163a and 163b to reduce friction caused by relative movement between the guide sleeves 164a and 164b and the pull rod 150. The two guide sleeves 164a and 164b are preferably made of a material such as Teflon. In any embodiment, the load-bearing elements are fixed to the crossbeam 110 and located on two sides of the pull rod 150, while the guide sleeves surround the load-bearing elements, respectively, in a rotatable fashion and are spaced apart from the pull rod. In the present invention, "spaced apart" means that there is a very small gap between each guide sleeve and the pull rod, such that when the pull rod is not deformed or is only slightly deformed, no contact occurs between the pull rod and each guide sleeve, whereas when deformation of the pull rod exceeds a reasonable range, the pull rod is supported through contact with a guide sleeve. The mechanical linkage circuit breaker with a guiding means according to the present invention can not only prevent deformation and destabilization of the pull rod, but also reduce friction caused by relative movement between the guide sleeves and the pull rod, thereby reducing wear of the guide sleeve material. Not only is it ensured that the distance between each guide sleeve and the pull rod is within a certain range in order to guarantee the reliability and stability of the mechanical linkage circuit breaker, but costs are also reduced. In addition, the guiding means is easy to install and avoids jamming, etc. which might occur in the course of operation.

In the embodiment shown in Fig. 2 and the other embodiment shown in Fig. 3, the two load-bearing elements 163a and 163b are bolts, while the guide sleeves 164a and 164b are tubular. Those skilled in the art will understand that the two load- bearing elements 163a and 163b may also be other components capable of fixing the guide sleeves 164a and 164b in position, as long as they allow relative rotation of the guide sleeves 164a and 164b, but when bolts are used, installation is simple and the cost is low. In the embodiment shown in Fig. 2, the guiding means 160a also comprises two nuts 170; the load- bearing elements 163a are screwed into the corresponding nuts 170 after passing through the corresponding guide sleeves 164a. In the embodiment shown in Fig. 2, a bush 165 may be provided between each load-bearing element 163a and guide sleeve 164a, in order to mount the load-bearing element 163a firmly on the crossbeam 110. The bush 165 surrounds the load-bearing element 163a, being provided between the load-bearing element 163a and guide sleeve 164a. This allows the nut 170 to be used to mount the load-bearing element 163a firmly on the crossbeam 110. In addition, in order to reduce shaking, a first washer 1630 may be provided between each load-bearing element 163a and the crossbeam 110, while a second washer 171 is provided between each nut 170 and bush 165. It is also possible to provide a bush limiter 1651 between each bush 165 and second washer 171, or if there is no second washer 171, to provide a bush limiter 1651 directly between each bush 165 and nut 170. In the case where there is no interference fit between each guide sleeve 164a and bush 165, the bush limiter 1651 can limit the position of the guide sleeve 164a, or if there is no bush limiter 1651, a second washer of larger diameter than the bush 165 can limit the position of the guide sleeve 164a. The bush limiter 1651 may also form a single piece together with the bush 165. The bush limiter 1651 and bush 165 are preferably made of metal. In the embodiment shown in Fig. 3, the guiding means 160b also comprises a frame 175, with a channel 1753 inside the frame 175, and the guide sleeves 164b disposed in the channel 1753. Two through-holes 1751 are formed on one side of the frame 175, while two threaded holes 1756 are formed on the opposite side. The load-bearing elements 163b are screwed into the corresponding threaded holes 1756 after passing through the crossbeam 110, the corresponding through-holes 1751 and the corresponding guide sleeves 164b in sequence. The frame 175 is preferably made of a metal such as aluminum. Providing a frame 175 enhances the supporting capability of the guiding means 160 in a direction substantially perpendicular to the length direction of the pull rod 150, so that the pull rod 150 is unlikely to deform, ensuring that the mechanical linkage circuit breaker 100 is more reliable and stable. The above embodiments are merely preferred embodiments of the present invention, which are not intended to limit it. Any modifications, equivalent substitutions or improvements etc. made within the spirit and principles of the present invention should be included in the scope of protection thereof.

Claims

1. A mechanical linkage circuit breaker (100) comprises a crossbeam (110) and a pull rod (150), wherein the pull rod (150) is disposed in the crossbeam (110), characterized in that the mechanical linkage circuit breaker (100) also comprises a guiding means (160, 160a, 160b);

the guiding means (160, 160a, 160b) comprises two load- bearing elements (163a, 163b) and two guide sleeves (164a, 164b), wherein the load-bearing elements (163a, 163b) are fixed to the crossbeam (110) and located on two sides of the pull rod (150), and the guide sleeves (164a, 164b) surround the load- bearing elements (163a, 163b), respectively, in a rotatable fashion and are spaced apart from the pull rod (150) .

2. The mechanical linkage circuit breaker (100) as claimed in claim 1, characterized in that the load-bearing elements (163a, 163b) are bolts, and the guide sleeves (164a, 164b) are tubular .

3. The mechanical linkage circuit breaker (100) as claimed in claim 2, characterized in that the guiding means (160, 160a, 160b) also comprises two first washers (1630) disposed between the load-bearing elements (163a, 163b) and the crossbeam (110) .

4. The mechanical linkage circuit breaker (100) as claimed in claim 3, characterized in that the guiding means (160a) also comprises two nuts (170), and the load-bearing elements (163a) screw into the corresponding nuts (170) after passing through the corresponding guide sleeves (164a).

5. The mechanical linkage circuit breaker (100) as claimed in claim 4, characterized in that the guiding means (160a) also comprises two bushes (165) disposed between the load-bearing elements (163a) and the guide sleeves (164a) .

6. The mechanical linkage circuit breaker (100) as claimed in claim 4, characterized in that the guiding means (160a) also comprises two second washers (171) disposed between the nuts (170) and the bushes (165) .

7. The mechanical linkage circuit breaker (100) as claimed in claim 3, characterized in that the guiding means (160b) also comprises a frame (175), with a channel (1753) inside the frame (175), and the guide sleeves (164b) disposed in the channel (1753); two through-holes (1751) are formed on one side of the frame (175), while two threaded holes (1756) are formed on the opposite side; the load-bearing elements (163b) are screwed into the corresponding threaded holes (1756) after passing through the crossbeam (110), the corresponding through-holes (1751) and the corresponding guide sleeves (164b) in sequence.

8. The mechanical linkage circuit breaker (100) as claimed in claim 7, characterized in that the frame (175) is made of metal .

9. The mechanical linkage circuit breaker (100) as claimed in any one of claims 1 to 8, characterized in that the two guide sleeves (164a, 164b) are made of Teflon.