JPS5954136A - Vacuum switch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vacuum switch equipped with a vacuum valve, and is particularly aimed at reducing the size and weight of the vacuum switch.

In general, vacuum switches are often used for load switching applications in the low to high voltage range because they have better insulation recovery characteristics, shorter cut-off times, noiseless cut-off, and maintenance-free characteristics than air switches. There is a strong demand for smaller and lighter weight devices because they lead to smaller control panels and electrical rooms and are more economical.

Conventional vacuum switches of this type mainly include a vertically mounted type with a low voltage circuit as shown in Figures 1 to 4, and a stationary type with a high voltage circuit as shown in Figures 5 to 6.

In Figures 1 to 4, (1) is ID~10 Torr
The vacuum pulps are held in a vacuum state of (See Figure 1).

(5) and (6) are a fixed contact and a movable contact of the vacuum valve (1), and a flexible conductor ( 8) is attached to which the power supply side terminal (9) is connected, and a flexible conductor (11) is attached below the movable electrode (10) of the movable contact (6) by a fastening member. The load side terminal - is connected through the terminal. An operating rod (13) is screwed to the lower end of the movable electrode (JO) to which the flexible conductor (11) is attached, and a lower end inserted into the operating rod (19) is screwed to the lower end of the movable electrode (JO) to which the flexible conductor (11) is attached. A pressure spring t15) is elastically mounted between the spring receiver 04), and a contact point (between 58 and 6) is provided at the lower end of the operating rod 08) into which the spring receiver 04) is inserted. adjustment knob to adjust the gap and contact wipe amount when opening)
Qa) and a support nut (17) are screwed together (see Figure 4).

In addition, for light), the tip is the above-mentioned ball catch 0 → and the adjustment nut 0
61 and engages with the above-mentioned operation@Oat to support the spring receiver 04), while the other end is rotatably supported by a bearing (10) fixed to the mounting plate (4). A U-shaped operating arm made of an insulator that is screwed together with the movable core (21) on the shaft (shaft) and moves the operating rod θB) in the axial direction (221 is opposed to the movable core (21) The movable core (4) includes a fixed core (roll), a yoke example, and an operation coil p+ wound around the fixed core (roll)) arranged and attached to the mounting plate (4) so as to be adjacent to each other. 21), and rotates the operating arm (18) in the counterclockwise direction shown in the figure, thereby pushing up the movable electrode and bringing the movable contact (6) and the fixed contact (5) into contact contact;
(26) is the movable iron core (21) when the electromagnet (b)) is deenergized.
) is a trip spring that pulls down the movable electrode (10) via the operating arm (G) to open the contact by applying a clockwise rotational force to the trip spring; (B) is an adjustment nut for the trip spring; (See Figure 1). In addition, Section 2.3
In the figure, (281, (the box is an auxiliary contact mechanism that engages with the movable core (211) and is fixed to the mounting plate (4) by a connecting rod (not shown)), and r is the saving resistance of the electromagnet.

Therefore, in the vacuum switch having the above configuration,
When voltage is applied to the electromagnet (operating coil 2),
The movable core (21) is attracted to the fixed core against the force of the tripping spring, and the fixed contact (5) and the movable contact (6) have a differential pressure, that is, the pressure difference between atmospheric pressure and the pressure inside the vacuum pulp (1). The circuit is closed by the force of the pressure spring 05). At this time, the operating arm (4) rotates by the contact wipe amount beyond the point where the fixed contact (5) and the movable contact (6) contact (see Figure 1). The force of the separation spring (2) does not act on the movable contact (6), but on the fixed contact (6).
5) and the movable contact (6) are closed by the pressure difference. In addition, before the moving iron core (21) and the fixed iron core are attracted to each other, the auxiliary contacts constituting the delay operation mechanism are opened and the saving resistors )+ and qi are connected in series to the operating coil ■), thereby causing the operating coil (25) and saving resistance (291, (29r
The electromagnet (〃) is attracted and held by the applied voltage.

In this state, when the electromagnet (2)) is demagnetized, the movable core (21) is separated from the fixed core (2) by the force of the tripping spring (support), and is centered around the shaft (20) as shown in Figure 1. Rotate clockwise in the figure to the position shown by the dashed line. therefore,
Along with this, the operating arm 08) fixed to the shaft also rotates in the clockwise direction shown in the figure around the shaft, and the movement of this operating arm (18) is transmitted to the adjustment nut α6) for operation. The movable contact (6) connected to this via the arm (G) is pulled out downward and the contact opens.

In contrast to the vertical mounting type vacuum switch for low pressure with the configuration in Figures 1 to 4 described above, the vacuum switch with the configuration in Figures 5 to 6, in which the same parts are indicated by the same reference numerals, is a floor-mounted vacuum switch for high pressure. In the figure, (BO) is a plastic umbrella-shaped insulating flange that insulates between the movable contact (6), which is the main circuit part of the vacuum valve (1), and the ground. Insert molded from processed metal rods. ) is a U-shaped mounting frame, and inside this mounting frame the electromagnet (
22), a saving resistor (not shown), a bearing α, etc., and a mounting base (2) containing vacuum pulp (1) is placed thereon. Note that the floor-standing type vacuum switch operates in the same manner as the vertically-mounted type described above.

However, the conventional vacuum switch having the above structure has the following drawbacks.

First, in the vertical plate type vacuum switch with the configuration shown in Figures 1 to 4, 6-(1) The vacuum valve (1), the electromagnet, the auxiliary contact mechanism, the saving resistor, etc. are arranged in series. , the installation area is large, and therefore the control panel storage area is also large.

(2) Since the vacuum valve (1) is housed within the mounting base (2), it is difficult to measure, inspect, and replace the vacuum valve (1).

(8) It is difficult to visually check the wear status of the contacts of the vacuum valve (1).

(4) Since the shaft and bearing (191) are mounted on the mounting plate (4), distortion etc. may occur when tightening it to a control panel etc., which tends to cause rotational malfunction.

In addition, in the floor-standing type high-pressure vacuum switch shown in Figures 5 and 6, (1) the vacuum valve (1) and the auxiliary contact mechanism are arranged in series, so Because of the large size, the size will have a large effect on the size when stacking in multiple stages with power fuses, high-voltage combination starters, etc.

(2) Since the insulating flange example is formed in an umbrella shape to maintain the insulation distance between the grounding points, the umbrella is large, the interphase pitch is large, and the width dimension is also large.

(81 Vacuum pulp (1) is connected to insulating flange (3o), conductors (8), (11), so vacuum valve (
When replacing 1), insulating flange (), conductor (8), (
11), which made handling extremely inconvenient.

Therefore, the present invention has been made for the purpose of eliminating the drawbacks of the conventional ones as described above and providing a small and inexpensive vacuum switch. In the device, a cross bar 1 engages with a movable iron core of an electromagnet and rotates, and engages with a movable part of the vacuum pulp, and when the electromagnet is energized, the engagement with the cross bar is released and rotates, causing the above movable The vacuum valve is installed in an insulating case, and a mounting frame is provided at the back of the vacuum valve, and the electromagnet is arranged and fixed within the mounting frame. It is characterized by:

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 7 to 11, which are indicated by the same reference numerals as in FIGS. 1 to 6.

In the figure, the arm is made of an insulator, and its U-shaped tip (32a) drives the operating rod (1B), and the other end (32b) is driven by the operating plate (88). axis t34)
It is configured to rotate around the vacuum valve (1
), and each rotates independently around axis 4. The operation plate (88) is a crossbar.
The cross bar (a) is connected to the movable iron core +211 at one end and rotates between the shafts. (
37) is a trip spring that normally opens the movable contact (6) of the vacuum valve (1) from the fixed contact (5) via the operation plate (831, operation arm 1321), and is connected to the crossbar.
are closely involved.

Further, (381 is an insulating case molded from thermosetting resin, which houses the vacuum valve (1) and has a power supply side terminal (38a) and a load side terminal (38b).

M is a relay terminal with a heat dissipation effect that electrically connects the fixed contacts (5) of the vacuum valve (1) and the power terminal (38a). 5
A) is fixed, and the power terminal (38a) is screwed onto the relay terminal)j with a screw 141). and readable conductor C
11) 9- One end is fixed to the movable contact (6A) of the vacuum valve (1) by the operation rod αB), and the other end is screwed to the load terminal (38b) with a bolt (8)).

W3+ is a mounting frame that fixes the shaft 1, +861, tripping spring (371) and stores the electromagnetic square, and has a fixed iron core (4).
) is attached to the mounting plate +14). ←6)
, (3))' is an auxiliary contact mechanism that operates in conjunction with the crossbar...). As shown in the figure, the vacuum valve (1) is installed inside the insulating case (37), and a mounting frame (6) is provided at the back of the vacuum valve (1), and inside this mounting frame (48) The above-mentioned electromagnet holder is placed and fixed in the structure, and the electromagnet holder in this configuration has a capacitor and a resistor connected in parallel with a special contact on the AC side, and a coil connected on the DC side to reduce power consumption. are doing.

In the vacuum switch with the above configuration, when the electromagnet (21) is now excited, the movable core (21) is attracted against the trip spring (2), and the crossbar (2) is centered around the shaft 4. Rotated counterclockwise. On the other hand, the operating arm disengages from the crossbar (...) and rotates counterclockwise around the axis, so that the movable contact (6) in the vacuum valve (1)-10- Due to the pressure difference with the atmospheric pressure, it connects with the fixed contact (5) and the main circuit is closed. At this time, the auxiliary contacts 06) and (1
6 (also operates, the normally closed contacts open and the normally open contacts close.

Next, when the electromagnetic core (5) is demagnetized, the movable core (21) is separated from the fixed core by the trip spring (37),
The crossbar 1&i) rotates around the axis -). Therefore, the operation plate (83) of the crossbar (■) is activated by releasing the energy stored in the above-mentioned trip spring value).
21, the operating arm 9321 is rotated clockwise, and the other end (32a) of the operating arm 121 is connected to the operating rod (32b) connected to the movable contact (6) of the vacuum valve (1).
1B) to the right in the figure, that is, the movable contact (6) forms an open circuit state with the fixed contact (5), and the main circuit is opened.

As described above, in the above configuration, the electromagnet (4) is arranged on the back of the vacuum valve (1), and the electromagnet (4) is provided between the crossbar link and the operating arm, respectively. ), the vacuum switch itself can be made compact, and the vacuum valve (1) can be replaced from the surface by removing it with one screw and pulling it out. Moreover, if a contact wear limit line is provided on the movable contact (6A) of the vacuum valve (1), visual control can be performed from the surface.

As described above, according to the present invention, the crossbar 1, which engages with the movable core of the electromagnet and rotates, engages with the movable part of the vacuum pulp, and is disengaged from the crossbar when the electromagnet is energized. The vacuum valve is provided with an operating arm that rotates and urges the movable part in the direction of closing the circuit, and the vacuum valve is installed in an insulating case, and a mounting frame is provided at the back of the vacuum valve, and the electromagnet is mounted within the mounting frame. Since the position is fixed, it is possible to obtain a small vacuum switch whose vertical and horizontal external dimensions are smaller than conventional products, and which can be mounted both vertically and horizontally.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional side view showing a conventional vertical M-type vacuum switch, Fig. 2 is a front view of Fig. 1, Fig. 6 is a right side view of Fig. 2, and Fig. 4 is a 1 is a partially enlarged view, FIG. 5 is a front view of a conventional floor-mounted vacuum switch, FIG. 6 is a right side view of FIG. 5, and FIG. 7 is a front view showing an embodiment of the present invention. , FIG. 8 is a partially sectional left side view of FIG. 7, FIG. 9 is a right side view of FIG. 7, and FIG. 1 (Ik. 11 is a top view and bottom view of FIG. 7, respectively.) 1)...Vacuum valve (5A)...Fixed contact (6)
A)...Movable contact αB)...Operation rod (4)...Electromagnet -...Operation arm a# axis))
・・Crossbar (hu) ・・Axis vI) ・・Trip spring ・・・Insulation case ・・・Mounting frame Note that in the drawings, the same reference numerals indicate the same or similar parts. Agent Makoto Kuzuno - 13- Figure 1 Figure 627 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 9 Figure 8 Figure 9 Figure 10 Figure 1 4 Figure 11 Procedural Amendment (Awareness) ) 7119 Showa year, month, day 2, name of the invention: True nitrogen switch 3, relationship with the case of the person making the amendment Patent applicant address: 2-2-3 Marunouchi, Chiyoda-ku, Tokyo Name (601) Mitsubishi Electric Corporation Representative: Katayuni Hachibu 4, Agent address: 2-2-3-5, Kunouchi, Chiyoda-ku, Tokyo, detailed description of the invention in the specification subject to amendment, drawing 6, content of amendment (1) ) The statement ``to be brought into contact by contact-1'' in page 4, line 10 of the specification has been amended to ``to be brought into contact''. (2) The description ``power side inductor (38α), load side terminal (381)) J'' on page 9, line 14 to line 15 of the specification is changed to ``power side terminal (9), load side terminal 02''. to correct. (3) The descriptions of "power supply terminal (31) J" in lines 14 to 17 and lines 19 to 20 of page 9 of the specification are respectively corrected to "power supply terminal (9)." (4) [Load return (38b) J] on page 10, line 2 of the specification
The description is corrected to "negative 6 children α)". (5) The statement ``dissolved'' on page 11, line 6 of the specification is amended to ``opened''. (6) Among the drawings, Figures 2 and 8 will be corrected in separate sheets. 7. Catalog drawings of attached documents 2 or more copies 2- Figure 2 29) 4 28

Claims (1)

[Scope of Claims] (1) A crossbar that engages with a movable core of an electromagnet and rotates.1 A crossbar that engages with a movable part of a vacuum valve, and when the electromagnet is energized, the engagement with the crossbar is released and rotates. The vacuum valve is provided with an operating arm that biases the upper and rotational portion in the direction of closing the circuit, and the vacuum valve is installed in an insulating case, and a mounting frame is provided on the back side of the vacuum valve, and a mounting frame is provided within the mounting frame. A vacuum switch characterized in that the electromagnet described above is arranged and fixed. (2) The vacuum switch according to claim 1, wherein the crossbar and the fulcrum shaft of the operating arm are provided separately within the mounting frame. (8) The vacuum switch according to claim 1 or 2, wherein a relay terminal is connected to a fixed contact in the vacuum valve, and this is screwed to a power supply side terminal fixed to the insulating case. (4) An operating rod and a combustible conductor are screwed together with the movable contact of the vacuum valve, and this is screwed to the load side terminal fixed to the insulating case. vacuum switch.