GB2451621A

GB2451621A - An auxiliary switch

Info

Publication number: GB2451621A
Application number: GB0715113A
Authority: GB
Inventors: Zhihao Ren; Li Zhengqiang
Original assignee: Chengdu Reliance Electric Co Ltd
Current assignee: Chengdu Reliance Electric Co Ltd
Priority date: 2007-08-06
Filing date: 2007-08-06
Publication date: 2009-02-11
Anticipated expiration: 2027-08-06
Also published as: GB2451621B; GB0715113D0

Abstract

This invention discloses a kind of auxiliary switch, which includes rotor shaft (1), cover plate (2), connecting bolt (3), draw bar (4) and multilayer contact subassembly (5). Each layer of the contact subassembly (5) consists of base (6), moving contactor (7), moving contactor holder (8), fixed contactor (9), spring (10), junction device and cam (12). The rotor shaft (1) is divided into two parts: coarse shaft (see 13 of fig 4) and fine shaft (see 14 of fig 4), which are both polygonal shafts; on the coarse shaft (see 13 of fig 4) of the joint place between the coarse shaft (see 13 of fig 4) and fine shaft (see 14 of fig 4), a limiting holder (see 15 of fig 4) is set up. The termination (11) is made of wire pressing rim (16) and screw (see 17 of fig 3). The auxiliary switch of this invention is small in size, thin in thickness with multilayer and compact structure, which is convenient in wiring and can be automatically operated.

Description

A KIND OF ULTRATHIN AUXILIARY SWITCH WITH

CONVENIENT WIRING

Field of technology

This invention relates to a switching device used in a kind of electric apparatus, especially is a kind of auxiliary switch (also referred as universal change-over switch or cam switch) used in electric control loops, which belongs in the technical field of electric apparatus.

Background of technology

An auxiliary generally includes transmission mechanism, tensioner and multilayer contact subassembly; each layer of the contact subassembly consists of base.

contactor component. junction device and the cam. At present, there are two kinds of auxiliary switches existing: one does not have a rotor shaft, such as the universal change-over switch disclosed in the instruction manual in Chinese patent for invention No. CN200510039139.8, which drives directly through the spline cam made of plastic material, whose disadvantages arc that the mechanical strength is poor, the transmission efficiency is also poor, and it even has time sequence error, especially cannot be used as auxiliary switches with high pitch number. Now, another kind of well-known auxiliary switch such as the universal change-over switch disclosed in the instruction manual in Chinese patent of utility model No. CN200420032370.5, although it is equipped with a rotor shaft (in the patent, its definition is a cam shaft), because the equipped rotor shaft is an equal-thickness shaft, it is only suitable for manual operation, not convenient for connecting the auxiliary switch with the operating mechanism of controlling equipment. i. e., automatic control cannot be realized; moreover, the adoption of the equal-thickness shaft will increase the whole volume of the auxiliary switch, or even make the cam wall thinner to cause interelectrode short circuit. Meanwhile, none of the bases used in the existing well-known auxiliary switches sets up reinforcing prop, so during the operation, the base, especially the slide way of the moving contactor holder on the base is liable to deformation, resulting in that the moving contactor stuck in the slide way of the base so as to cause electric fault. in addition, all the existing technology adopts wiring board component as the juction device, whose disadvantages are that the wiring efficiency is low and the thickness and space are more occupied.

Content of the invention The aim of this invention is to overcome the above-mentioned shortcomings.

This invention presents a thinner and compact sized auxiliary switch which consists of rotor shaft, cover plate. connecting bolt, draw bar and multilayer contact subassembly.

Each layer of the contact subassembly consists of base, moving contactor, moving contactor holder, fixed contactor, spring, junction device and cam. The auxiliary switch of this invention is small in size, thin in thickness with multilayer, which is convenient in wiring and can be automatically operated.

In order to solve the technical problem, the adopted technical proposal is: a kind of auxiliary switch which consists of rotor shaft, cover plate, connecting bolt, draw bar and multilayer contact subassembly. Each layer of the contact subassembly consists of base, moving contactor, moving contactor holder, fixed contactor, spring, junction device and cam. The feature of its structure is that the rotor shaft is divided into two parts: coarse shaft and fine shaft, on the coarse shaft of the joint place between the coarse shaft and fine shaft, a limiting holder is set up.

The above mentioned coarse shaft and fine shaft are both polygonal shafts, whose cross section shape is either trihedron. quadrangle or more polygonal forms.

The above mentioned coarse shaft and fine shaft are both metallic shafts. At one end of the coarse shaft, a polygonal hole is prepared to match with the fine shaft, and the fine shaft can be inserted into the polygonal hole of the coarse shaft.

The above-mentioned limiting holder is made of plastic material. The connection between the coarse shaft and the limiting holder adopts non-detachable tight coupling.

At the end face of the limiting holder, a through hole is set up for facilitating the insertion and pulling of the tine shaft.

At the position close to the moving contactor holder on the front face of the above mentioned base, multiple reinforcing props combined with the base as an integral body are set up. and on the rear face of the base, corresponding holes with the reinforcing props are prepared.

On the front face of the above mentioned base, multiple positioning props combined with the base as an integral body are set up. whose shape is either cylindrical or polygonal column, and on the rear of the base, corresponding holes with the positioning props are prepared.

The above-described junction device in the base consists of wire pressing rim and screws. Between the above-mentioned wire-pressing rim and screws, lifting leets can be arranged.

The above described junction device can be made of elastic clips.

On the first end and the last end of the above-mentioned multilayer contact subassembly, baffle plates are respectively set up.

Compared with the existing technology, the beneficial effects of this invention arc as follows: The rotor shaft adopted in this invention is the polygonal shaft and is divided into two parts: coarse shalt and the fine shaft. The coarse shalt part is inserted into the actuating mechanism of the controlling equipment and directly connected with it, whose beneficial effect is that it can realiie the automatic actuation on the auxiliary switch of this invention, especially suitable for automatic control systems.

The coarse part receives different control actions on the auxiliary switch from the controlling equipment and transmits to the fine shaft part. The fine shaft part is inserted into the cams in each layer of contact subassembly, by matching with the corresponding polygonal holes at the cam center, the cams in each layer are driven to rotate to realize on/off switch-over of multiple circuits. Because the cross section of the fine shaft is relatively small, the diameters of the polygonal holes at the cam center can also be reduced, thereby the external dimensions of the cam and base can be reduced so as to realize the miniaturization of the size of whole auxiliary switch, compaction of the structure and the space can be saved. On the coarse shaft of the joint place between the coarse shaft and fine shaft, a limiting holder is set up for realizing accurate position limitation to ensure no axial drunkenness on the rotor shaft and prevent the rotor shaft from out-of location in the auxiliary switch or from breaking out from the auxiliary switch.

In this invention, at the position close to the moving contactor holder on the front face of the base, multiple reinforcing props combined with the base as an integral body are set up, and on the rear face of the base, corresponding holes with the reinforcing props are prepared. The beneficial effects are that, in the multilayer contact subassembly of the auxiliary switch, the reinforcing props on the former front layer of the base can be inserted into the corresponding holes on the latter rear layer of the base, thereby. the multilayer base is formed as a integral body with higher strength which can prevent the base from deformation, especially can prevent the slide way of moving contactor holder on the base from deformation to ensure that the moving contactor can smoothly slide back and forth in the slide way on the base so as to avoid arising electric failure because the moving contactor holder stuck in the slide way of the base. -Li--

In this invention, on the front face of the above-mentioned base, multiple positioning props combined with the base as an integral body are set up, and on the rear face of the base, corresponding holes with the positioning props arc prepared.

Similar to the principle of the above-mentioned reinforcing props, the former layer positioning props on the front face of the base can also be inserted into the corresponding holes of the latter layer on the rear face of the base. The beneficial effect is that it can improve the assembly accuracy of the adjacent two base layers to prevent the deflection or dislocation of the base and improve the flatness of whole piece of auxiliary switch.

The junction device of this invention consists of the wire pressing rim and screws, whose beneficial effect is that the wiring is convenient with high wiring efficiency and the thickness of each layer of contact subassembly can be reduced. Compared with the existing technology which adopts wiring plate component as the junction device, the wire pressing rim occupies less thickness space. and there is no need of pre-connection terminals and the screw itself will not occupy any wiring space. But as for the wiring plate component, because the screw itself occupies wiring space, the thickness space occupied by the wiring board is more than the wire pressing rim. In addition, when adopting wiring board component, the pre-connected terminal is needed at the end of the wire, which results in low wiring efficiency. Because this invention adopts the wiring device with less thickness space occupied, this invention can reduce the thickness of each layer of contact subassembly, thereby increase the layers of the auxiliary switch to realize more functions. When the layers of the contact subassembly of this invention are the same as the existing technology, this invention can greatly reduce the height of the auxiliary switch so as to realize ultra-thin auxiliary switch. The beneficial effect from setting up the lifting sheet between the wire pressing rim and the screw is to protect the leading wires from compression injury and make the wire pressing more reliable.

The junction devices of this invention can also be made of elastic clips. The beneficial effects to use elastic clips are wiring rapidly and strong shock resistance.

The structure of the elastic clip is simple. The elastic clip which is made by bending a piece of leaf spring as required can carry out two functions of jointing and pressing at the same time. Not only the junction is convenient, but also the operation is rapid and can plug and play. The process of tightening the screw by repeatedly rotating the screw in the existing technology can be left out. The efficiency is improved, and the structure is simplified. Besides, the thickness interspace that the elastic clip needs is also smaller than that of the terminal block which is adopted in the existing technology. so the thickness of contact subassembly in each layer can be reduced, and the ultra thin auxiliary switch can be achieved.

The beneficial effect of setting up baffles on the beginning and the end of multilayer contact subassembly in this invention is to block out the contact subassembly at the first end layer and the last end layer, so as to prevent the deformation of cover plate to affect the component in the first end layer and the last end layer contact subassembly. in this invention, the auxiliary switch is mounted onto the control equipment via cover plate and the connecting bolt for the cover board. If installation errors exit on the mounting location between the cover plate and the control equipment, the installation may sometimes cause deformation of the cover board. The function of the baffles is to protect the element in first end layer and last end layer contact subassemblies not to shift or fall off, and consequently further improve the reliability of the auxiliary switch.

Explanation for attached drawings Now we make a further detailed explanation of the attached drawings and particular implementing examples to the invention.

Figure 1 is the overall structural representation of this invention.

Figure 2 is the structural representation of the contact subassembly in the first implementation method of this invention.

Figure 3 is the structural representation of the wire pressing rim junction device adopted in the first implementation method of this invention.

Figure 4 is the structural representation of the rotor shaft of this invention.

Figure 5 is the structural representation of the front face of the base of this invention.

Figure 6 is the structural representation of the rear face of the base of this invention.

Figure 7 is the structural representation of the contact subassembly in the second implementation method of this invention.

Figure 8 is the 3 kinds of structural representation of the elastic clips junction device adopted in the second implementation method of this invention.

Particular implementation method As Shown in Figure 1-6, the first implementation mode is: a kind of auxiliary switch, which includes rotor shaft 1, cover plate 2, connecting bolt 3, draw bar 4 and multilayer contact subassembly 5. Each layer of the contact subassembly 5 consists of base 6, moving contact 7, moving contact holder 8. fixed contact 9. spring 10, junction device 11 and cam 12, where the rotor shaft 1 is divided into two parts: coarse shaft 13 and fine shaft 14. On the coarse shaft 13 of the joint place between the coarse shaft 13 and fine shaft 14. a limiting holder 15 is set up.

There are four junction devices in each layer of the contact subassembly 5. Every junction device 11 is made of wire pressing rim 16 and screw 17. Between wire pressing rim 16 and screw 17, hfiing hei 18 is set up. The coarse shaft 13 and fine shaft 14 are both metallic shafts which are unequal in thickness. Square shafts (viz.

quadrilateral shafts) arc adopted in this case. At one end of the coarse shaft 13. a square hole is prepared to match with the fine shaft 14, and the fine shaft 14 can be inserted into the polygonal hole of the coarse shaft 13. In the operating process of this implementation case, the coarse shaft part 13 of the rotor shaft is inserted into the actuating mechanism of the controlling equipment and directly connected with it. The coarse shaft part 13 receives different control actions on the auxiliary switch from the controlling equipment and transmits to the fine shaft part 14. The fine shaft 14 is inserted into the cam 12 in each layer of contact subassembly 5, by matching with the corresponding square holes at the cam 12 center, the cams in each layer is driven to rotate to realize on/off switch-over of multiple circuits.

On the first end and the last end of the multilayer contact subassembly 5, baffle plates 19 are set up. On the exterior of the front and rear baffle plates, cover plates 2 is set up. The multilayer contact subassembly 5, cover plates 2 and baffle plates 19 are joined into a integral body by two draw bars, two connecting bolts 3. whose front potion is laid in the cover plates 2 and rod portion is extended from the cover plates 2 and connected with the mounting parts of the control equipment, arc respectively set in the front and rear cover plates 2. If installation errors exit on the mounting position between the cover plate 2 and the control equipment, the installation may cause deformation of the cover plate 2. The function of the baffle plates 19 is to protect the element in first and last end layer contact subassembly 5 not to shift or fall back.

The limiting holder 15 is made of plastic material and connected together with the coarse shaft 13 by means of flush bonding injection moulding. The connection between these two devices adopts non-detachable tight coupling. At the end face of the limiting holder 15, a through hole is set up for facilitating the insertion and pulling of the fine shaft 14. The shape of the liiuiting holder 15 assumes echeloned cylindrical, whose narrow end is set into the center hole of the front cover plate 2. The step face -g...

between the wide end and the narrow end is just buckled in the cover plate 2 to prevent the rotor shaft from shifting or falling out of the auxiliary switch.

The junction device 11 of this case consists of the wire pressing rim 16 and screws 17. whose wiring interspace is wide and the wiring is convenient with high wiring efficiency and the thickness of each layer of contact subassembly 5 can he reduced. The lifting sheets 18 can protect the leading wires from compression injury and make the wire pressing more reliable. For the auxiliary switch, the base 6 should be provided with proper insulation property. So only the plastic material can be adopted in the base 6. But this kind of base 6 deforms easily under the exogenic actions. In this case we find a solution to the problem, that is, at the position close to the moving contactor holder on the front face of the base 6, four reinforcing props 20 combined with the base 6 as an integral body are set up. and on the rear face of the base 6, corresponding holes 21 with the reinforcing props are prepared. In the multilayer contact subassembly of the auxiliary switch, the reinforcing props 20 on the former front layer of the base can be inserted into the corresponding holes 21 on the latter rear layer of the base, thereby, the multilayer base is formed as a integral body with higher strength which can prevent the base from deformation, especially can prevent the slide way of moving contactor holder on the base from deformation to ensure that the moving contactor 8 can smoothly slide back and forth in the slide way on the base so as to avoid arising electric failure because the moving contact holder 8 stuck in the slide way of the base.

While in this case, on the front face of the base 6, eight positioning props 22 combined with the base 6 as an integral body are set up. The shape of four positioning props on the edge of the base is triangular prism. The shape of the four positioning props in the center is cylindrical form, and on the rear face of the base 6, corresponding holes 23 with the positioning props 22 are prepared. Similar to the above-described principle of the reinforcing props 20, the positioning props 22 on the

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former front face of the base can be inserted into the corresponding holes 23 on the latter rear face of the base. The beneficial effect is that it can improve the assembly accuracy of the adjacent two base layers to prevent the deflection or dislocation of the base and improve the flatness of whole piece of auxiliary switch.

As shown in Figure 1, Figure 7 and Figure 8, the second particular implementation method is: A kind of auxiliary switch, including rotor shaft I, cover plate 2. connecting boll 3, draw bar 4 and multilayer contact subassembly 5. Each layer of the contact subassembly 5 consists of base 6, moving contactor 7, moving contactor holder 8, fixed contactor 9, spring 10, junction device 11 and cam 12.

The difference of Figure 8 with the first implementation method is that: The junction device 11 is composed of elastic clips 24. The structure of the elastic clip is simple, which is just made by bending a piece of leaf spring according as required.

The shape of the elastic clips can be different, but to carry out the functions of wire-pressing. Three structural shapes of the elastic clip are shown in a), b) and c) of Figure 8.

The advantage of using elastic clips is that it can carry out two functions of jointing and pressing at the same time. Not only the shock resistance performance is strong, but also the operation is rapid and can plug and play. The process of tightening the screw by repeatedly rotating the screw in the existing technology can be left out.

Besides, the thickness interspace that the elastic clip 24 needs is also smaller than the terminal block which is adopted in the existing technology, so the thickness of contact subassembly in each layer can be reduced. and the ultra thin auxiliary switch can be achieved. For the structures are the same between this implementation method and the first implementation method except the structure of the junction device 11, here we need not give unnecessary details anymore. -to

Mark sheet for attached drawings 1 Rotor shaft 2 Cover plate 3 Connecting bolt 4 Draw bar Contact subassembly 6 The base 7 Moving contactor 8 Moving contactor holder 9 Fixed contact Spring 11 Junction device 12 Cams 13 Coarse shaft 14 Fine shaft The limiting holder 16 Wire pressing rim 17 Bolt 18 Lifimg lieets 19 Baffle plates Reinforcing prop on the base 21 Holes fit the reinforcing prop on the base 22 Positioning prop on the base 23 Holes fit the positioning prop on the base 24 Elastic clips

I. Description of the functions of the invention:

The new structural design changes the wiring part of the universal change-over switch from the traditional plate type terminal structure into frame type terminal structure, thus makes the thickness of the product be reduced to half of the original one. Meanwhile, the wiring does not need special purpose "U" type or "0" type terminals, only need to peel the insulation skin from the wire then directly connect it.

As described above, this invention has realized the auxiliary switch which is small in size, thin in thickness and firm in connection, and the effective space utilization rate of the "control cabinet" has been improved.

LI. Examples:

In all the switching devices there are control units (i. c., control cabinet), namely, to mount a device with universal change-over switch on the surface to achieve functions of manual operation and data display. When mounting the universal change-over switches with the same thickness on the surface of the control cabinet, on the premise of ensuring electric performances, if the universal change-over switches with 13mm single layer thickness are used, only 10 layers (i. e., at most 20 loops) can be mounted. However, if 30 loops are needed for controlling by the equipment at the same time, it is unable to realize by one switch, i. e., unable to switch over 30 loops simultaneously. But if we use this kind of universal change-over switch with a thickness of 6.5mm, we can mount 20 layers (i. e., at most 40 loops), thus we can completely implement the function of switching over 30 loops at the same time. -I)--

Claims

Claims 1. A kind of auxiliary switch, including rotor shaft (1), cover plate (2), connecting bolt (3). draw bar (4) and multilayer contact subassembly (5). Each layer of the contact subassembly (5) consists of base (6), moving contactor (7), moving contactor holder (8), fixed contactor (9), spring (10), junction device and cam (12). Its feature lies in that the rotor shaft (1) is divided into two parts: coarse shaft (12) and fine shaft (14): on the coarse shaft (13) of the joint place between the coarse shall (13) and fine shaft (14), a limiting holder (15) is set up.
2. On the basis of the auxiliary switch described in Claim 1, the feature lies in that, the described coarse shaft (13) and fine shaft (14) are both polygonal shafts, whose cross section shape is either trihedron, quadrangle or more polygonal forms.
3. According to the auxiliary switch described in Claim I and Claim 2, the feature lies in that the coarse shaft (13) and fine shaft (14) are both metallic shafts. At one end of the coarse shaft (13), a polygonal hole is prepared to match with the fine shaft (14), and the fine shaft (14) can be inserted into the polygonal hole of the coarse shaft (13).
4. According to the auxiliary switch described in Claim 1, the feature lies in that the limiting holder (15) is made of plastic material. The connection between the coarse shaft (13) and the limiting holder (15) adopts non-detachable tight coupling. At the end face of the limiting holder (15), a through hole is set up for facilitating the insertion and pulling of the fine shaft (14).
5. According to the auxiliary switch described in Claim 1, the feature lies in that at the position close to the moving contactor holder (8) on the front face of the above mentioned base (6), multiple reinforcing props (20) combined with the base as an integral body are set up. and on the rear face of the base (6), corresponding holes (21) with the reinforcing props are arranged.
6. According to the auxiliary switch described in Claim 1 or claim 5, the feature lies in that, on the front face of the base (6), multiple positioning props (22) combined with the base (6) u.s an integral body are set up, whose shape is either cylindrical or polygonal column, and on the rear face of the base (6). corresponding holes (23) with the positioning props (22) are arranged.

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Claims
7. According to the auxiliary switch described in Claim 1, the feature lies in that the junction device (11) in the base (6) consists of wire pressing rim (11) and screws (17).
8. According to the auxiliary switch described in Claim 7, the feature lies in that between the above-mentioned wire-pressing rim (16) and screws (17), RItin thetts (18) can be arranged.
9. According to the auxiliary switch described in Claim 1, the feature lies in that the termination (11) in the base (6) is composed of elastic clips (24).
10. According to the auxiliary switch described in Claim 1, the feature lies in that on the first end and the last end of the described multilayer contactor subassembly (5), baffle plates (19) are respectively set up. * ** * * * * S. ** * S S... S. * * .. * .. * S. * S S *5* S

S

10. According to the auxiliary switch described in Claim 1, the feature lies in that on the first end and the last end of the described multilayer contact subassembly (5), baffle plates (19) are respectively set up.

Amendments to the claims have been filed as follows Claims 1. The auxiliary switch, including rotor shall (1), cover plate (2), connecting bolt (3), draw bar (4) and multilayer contactor subassembly (5), each layer of which consists of base (6), moving contactor (7), moving contactor holder (8), fixed contactor (9), spring (10), junction device and cam (12), whose feature lies in that the rotor shaft (1) is divided into two parts: coarse shall (13) and fine shaft (14); on the coarse shaft (13) of the joint place between the coarse shaft (13) and fine shaft (14), a limiting holder (15) is set up.

2. On the basis of the auxiliary switch described in Claim 1, the feature lies in that, the described coarse shaft (13) and fine shaft (14) are both polygonal shafts, whose cross section shape is either trihedron, quadrilateral or more polygonal forms.

3. According to the auxiliary switch described in Claim 1 and Claim 2, the feature lies in that the coarse shaft (13) and fine shaft (14) are both metallic shafts, at one end of the former one (13), a polygonal hole is prepared to match with the fine shaft (14), and the fine shaft (14) can be inserted into the polygonal hole of the coarse shaft (13). * I.

* 4. According to the auxiliary switch described in Claim 1, the feature lies in that the limiting holder (15) is made of plastic material, with which the connection of the coarse shaft (13) adopts * S non-detachable tight coupling, at the end face of which (15), a through hole is set up for facilitating the insertion and pulling of the fine shaft (14). * *. * p * S.. S

*:. 5. According to the auxiliary switch described in Claim 1, the feature lies in that at the position close to the moving contactor holder (8) on the front face of the above mentioned base (6), multiple reinforcing props (20) combined with the base as an integral body are set up, and on the rear face of the base (6), corresponding holes (21) with the reinforcing props are arranged.

6. According to the auxiliary switch described in Claim 1 or claim 5, the feature lies in that, on the front face of the base (6), multiple positioning props (22) combined with the base (6) as an integral body are set up, whose shape is either cylindrical or polygonal column, and on the rear face of the base (6), corresponding holes (23) with the positioning props (22) are arranged.

-is-.-Claims 7. According to the auxiliary switch described in Claim 1, the feature lies in that the junction device (Ii) in the base (6) consists of wire pressing rim (11) and screws (17).

8. According to the auxiliary switch described in Claim 7, the feature lies in that between the above-mentioned wire-pressing rim (16) and screws (17), lifting sheets (18) can be arranged.

9. According to the auxiliary switch described in Claim 1, the feature lies in that the termination (11) in the base (6) is composed of elastic clips (24).