CN109686615B

CN109686615B - Safe temperature limiter applying high voltage

Info

Publication number: CN109686615B
Application number: CN201811374648.XA
Authority: CN
Inventors: 朱茂凯卦; 肖永波
Original assignee: Jpci Controls Foshan Gaoming Co ltd
Current assignee: Jpci Controls Foshan Gaoming Co ltd
Priority date: 2018-11-19
Filing date: 2018-11-19
Publication date: 2020-07-17
Anticipated expiration: 2038-11-19
Also published as: CN109686615A

Abstract

The invention relates to a safety temperature limiter applying high voltage, which comprises a sleeve and an action rod arranged in the sleeve, wherein the bottom end of the action rod is propped against a temperature-sensing glass rod, the action rod sequentially penetrates through a fixed plate, a second isolation plate and a first isolation plate from bottom to top, the action rod is sleeved with a spring, the first isolation plate is propped against the upper end of the spring, the lower end of the spring is fixedly connected with a limiting plate, the limiting plate is fixedly connected with the action rod, the diameter of the limiting plate is larger than that of the sleeve, an electric contact head at the top end of the action rod is contacted with a connecting plate to realize the communication between the fixed plate and the connecting plate, after the temperature-sensing glass rod is broken by heat, the action rod drives the electric contact head to move downwards, the electric contact head is separated from the connecting plate by a certain distance to realize the disconnection of a circuit, the.

Description

Safe temperature limiter applying high voltage

Technical Field

The invention relates to a safety device, in particular to a safety temperature limiter applying high voltage.

Background

In railway heating systems, the air conditioner or the electric heating device often supplies 1500V in view of the power required for this function. This requires a fail-safe means in addition to temperature control to avoid the risk of fire in the event of a heating or temperature control system failure.

The safety device typically includes a temperature sensing wand heated by a heating system placed in the air, which causes the limiter to fail, resulting in a trip.

One of the difficulties with thermostat operation at high voltages is that this distance must separate the contacts when they are open, a common thermostat mechanism for low voltage circuits, such as 110V,220V,240V or even 400V, only separates the contacts to 0.3mm-0.5mm, a distance known by the electrical standard as "micro-break", such as the EN 60730 standard for temperature control. In the case of a complete disconnection, they must be greater than 3 mm. In contact systems used between 1500V and 1800V, in particular for safety temperature limiters, these distances must be much greater, about 14mm, these values being given by the EN 50124-1 standard. The conventional assembly of these devices causes them to melt or trigger the protective fuses of the air conditioning or heating circuit if they are shorted by overheating between the phase and neutral wires.

A difficulty is therefore to realise a system that provides this distance between the contacts when they are open, since the displacement provided by the usual mechanical means of thermostat and limiter is typically less than a few millimetres.

The latest solution currently exists for fusible alloys to be made by melting at the required temperature.

Of the problems that occur with these systems using fusible alloys, four are of critical importance:

first, it meets the ROHS and Reach standards and the use of lead and cadmium, two metals used in low temperature fusible alloys, such as those used in these products, is now prohibited.

Second, creep of these alloys, which gradually deforms when subjected to permanent stress. The fusible fuse is then gradually reduced, followed by a reduction in the contact gap distance, which then decreases below the required minimum value, a function that requires periodic replacement of the fusible sleeve.

Third, susceptibility to atmospheric contamination of the fusible alloy, corrosion which can impair the performance of the fusible alloy, particularly in humid or contaminated atmospheres.

Fourth, the sensitivity of the fusible to radiation generated by the heat-generating element depends on the temperature of the convective air. To overcome this disadvantage, which may lead to a fault trip, the known devices are usually equipped with a cap, which is positioned above the fusible sleeve and protects it from radiation.

Problems two and three require frequent and expensive preventive maintenance operations on the railway vehicle.

Disclosure of Invention

The present invention overcomes the disadvantages of the prior art and provides a safe temperature limiter using high voltage electricity, which is sufficient to ensure proper contact spacing, does not creep, and is not susceptible to corrosion.

In order to solve the technical problems, the invention is realized by the following technical scheme:

the safety temperature limiter comprises a sleeve and an action rod arranged in the sleeve, wherein the length of the action rod is larger than that of the sleeve, a containing piece is arranged at the bottom end of the sleeve, a temperature sensing glass rod is installed in the containing piece, the bottom end of the action rod abuts against the temperature sensing glass rod, the sleeve is far away from one end fixedly connected with a fixed plate of the containing piece, one end of the action rod far away from the containing piece is connected with an electric connecting piece, the other end of the electric connecting piece is connected with the top end of the action rod, a supporting column is arranged above the fixed plate, an insulator is arranged above the supporting column, a first isolation plate is arranged between the supporting column and the insulator, a second isolation plate is arranged between the fixed plate and the supporting column, the second isolation plate and the action rod are in contact all the time, a connecting plate is fixedly connected above the insulator, and the action rod, The spring-loaded mechanism comprises a second isolation plate and a first isolation plate, wherein the action rod is sleeved with the spring, the first isolation plate is abutted to the upper end of the spring, the lower end of the spring is fixedly connected with a limiting plate, the limiting plate is fixedly connected with the action rod, and the diameter of the limiting plate is larger than that of the sleeve.

Further, the top of action pole still is equipped with electric baffle, the action pole passes fixed plate, second division board, first division board and connecting plate from bottom to top in proper order, electric baffle is located the connecting plate top.

Further, the fixed plate is further provided with a microswitch, the limiting plate is further provided with a touch sheet, and the touch sheet is in contact with the microswitch.

Further, the accommodating piece is a protective bracket.

Further, the lower end of the sleeve is provided with a threaded connector, and the threaded connector is fixedly connected with the protective bracket through threads.

Further, the support columns and the insulators are arranged in pairs.

Furthermore, the other end of the electric connecting sheet is connected with an electric contact head, and the electric contact head is fixed at the top end of the action rod.

Compared with the prior art, the invention has the beneficial effects that:

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, with the understanding that the present disclosure is to be considered as an exemplification of the invention and is not intended to limit the invention to the embodiments illustrated in the drawings, in which:

FIG. 1 is a perspective view of the present embodiment 1;

FIG. 2 is a plan view of the present embodiment 1;

FIG. 3 is a plan view of the present embodiment 1;

FIG. 4 is a sectional view taken along line A-A of FIG. 3;

FIG. 5 is a sectional view taken along line B-B of FIG. 4;

FIG. 6 is a schematic view showing a broken structure of the temperature sensitive glass rod according to example 1;

FIG. 7 is an exploded view schematically showing embodiment 1;

FIG. 8 is a perspective view of the present embodiment 2;

FIG. 9 is a plan view of the present embodiment 2;

FIG. 10 is a plan view of the present embodiment 2;

FIG. 11 is a cross-sectional view taken along line C-C of FIG. 10;

FIG. 12 is a cross-sectional view taken along line D-D of FIG. 10;

FIG. 13 is a schematic view showing a broken temperature-sensitive glass rod according to example 2;

FIG. 14 is an exploded view schematically showing embodiment 2;

in the drawings, 1-sleeve; 2-action lever;

3-protective bracket; 4-temperature sensing glass rod;

5-a threaded joint; 6-fixing plate;

7-electrical contacts; 8-an electrical connection pad;

9-support column; 10-insulator;

11-first separator plate; 12-a second separator plate;

13-fastening screws; 14-a fastening washer;

15-connecting plate; 16-locking screw;

17-lock washer; 18-a spring;

19-limiting plate; 20-a micro switch;

21-touch piece.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.

Example 1:

as shown in fig. 1 to 7, the safety temperature limiter using high voltage electricity according to the present invention includes a sleeve 1 and a conductive operating rod 2 disposed in the sleeve 1, wherein the length of the operating rod 2 is greater than that of the sleeve 1, a receiving member is disposed at the bottom end of the sleeve 1, in this embodiment, the receiving member is a protective bracket 3, a temperature-sensitive glass rod 4 is mounted in the protective bracket 3, a threaded connector 5 is disposed at the lower end of the sleeve 1, the threaded connector 5 is fixedly connected to the protective bracket 3, the bottom end of the operating rod 2 abuts against the temperature-sensitive glass rod 4, a fixing plate 6 is fixedly connected to an end of the sleeve 1 away from the protective bracket 3, an electrical contact 7 is disposed at an end of the operating rod 2 away from the protective bracket 3, the fixing plate 6 is connected to an electrical connector 8, the electrical connector 8 is connected to the electrical contact 7, the electrical contact 7 is fixed to the top end of the operating, the supporting columns 9 and the insulators 10 are arranged in pairs, and the fixing plate 6 and the connecting plate 15 can be connected with an external circuit respectively.

A first isolation plate 11 is arranged between the supporting column 9 and the insulator 10, a second isolation plate 11 is always contacted with the action rod 2, a second isolation plate 12 is arranged on the fixing plate 6 and the supporting column 9, a connecting plate 15 is fixedly connected above the insulator 10 through a fastening screw 13 and a fastening washer 14, and a ground wire locking screw 16 and a locking washer 17 are further arranged on the connecting plate 15.

Action bar 2 passes fixed plate 6 from bottom to top in proper order, second division board 12 and first division board 11, action bar 2 cup joints spring 18, the upper end of 11 butt springs 18 of first division board, the lower extreme rigid coupling limiting plate 19 of

spring

18, 19 rigid couplings of limiting plate are in action bar 2, limiting plate 19's diameter is greater than 1 diameter of sleeve, fixed plate 6 still is equipped with micro-gap switch 20, limiting plate 19 still is equipped with touch piece 21, touch piece 21 contacts micro-gap switch 20, touch piece 21 stirs micro-gap switch 20, can report to the police or other operations.

The working principle of the embodiment is as follows:

when the electric contact head 7 at the top end of the action rod 2 is abutted against the connecting plate 15, the electric connecting sheet 8, the fixing plate 6 and the second isolation plate 12 form a passage; when the temperature-sensing glass rod 4 is broken when being heated, the spring 18 extends, the action rod 2 drives the electric contact 7 to move downwards, the electric contact 7 is separated from the connecting plate 15 by a certain distance, disconnection of a circuit is realized, the contact piece 21 on the limiting plate 19 toggles the microswitch 20, alarming or other operation can be carried out, the separation distance is large, and the temperature-sensing glass rod is safe and reliable.

Finally, it should be noted that: although the present invention has been described in detail with reference to the embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims

1. The safety temperature limiter is characterized by comprising a sleeve and an action rod arranged in the sleeve, wherein the action rod is longer than the sleeve, a containing piece is arranged at the bottom end of the sleeve, a temperature sensing glass rod is installed in the containing piece, the bottom end of the action rod is abutted against the temperature sensing glass rod, the sleeve is far away from one end of the containing piece and fixedly connected with a fixing plate, the fixing plate is connected with an electric connecting sheet, the other end of the electric connecting sheet is connected with an electric contact head, the electric contact head is fixed to the top end of the action rod, a supporting column is arranged above the fixing plate, an insulator is arranged above the supporting column, a first isolation plate is arranged between the supporting column and the insulator, a second isolation plate is arranged between the fixing plate and the supporting column, the second isolation plate and the action rod are in contact all the time, a connecting plate is fixedly connected above the insulator, and the, Second division board and first division board, action bar cup joints the spring, the upper end of first division board butt spring, the lower extreme rigid coupling limiting plate of spring, the limiting plate rigid coupling in the action bar, the diameter of limiting plate is greater than the sleeve diameter, the one end that protective cradle was kept away from to the action bar sets up the electrical contact head, and the electrical contact head on action bar top supports the connecting plate.

2. A safety temperature limiter according to claim 1, wherein the fixing plate further comprises a micro switch, the limiting plate further comprises a trigger piece, and the trigger piece toggles the micro switch after the temperature sensing glass rod is broken by heat.

3. The safety temperature limiter applied with high voltage electricity as claimed in claim 1, wherein the receiving member is a protection bracket.

4. A safety temperature limiter according to claim 3, wherein a screw joint is provided at a lower end of the sleeve, and the screw joint is screwed to the protection bracket.

5. A safety temperature limiter using high voltage electricity according to claim 1, wherein the supporting posts and the insulators are provided in pairs.

6. The safety temperature limiter according to claim 1, wherein the other end of the electrical connector is connected to an electrical contact, and the electrical contact is fixed to the top end of the actuating rod.