CN2593347Y

CN2593347Y - Explosion-proof temperature-controller

Info

Publication number: CN2593347Y
Application number: CN 02258226
Authority: CN
Inventors: 潘树彬; 丁晓江; 金华明; 蔡文斌; 杜立
Original assignee: Jiangsu Changheng Group Automatic Control Co Ltd
Current assignee: Changzhou Foland Electrical Appliance Co Ltd
Priority date: 2002-10-31
Filing date: 2002-10-31
Publication date: 2003-12-17
Anticipated expiration: 2012-10-31

Abstract

The utility model relates to the technical field of mechanical temperature control, particularly an explosion-proof temperature controller used for controlling the starting and closing of a refrigerating compressor in a refrigerator. A bellows, a pressure bearing plate, a regulation tension spring and a microswitch are arranged in the main body of the temperature controller, wherein, the microswitch is composed of a switch box, a partition board, a terminal, a movable contact, a static contact, a movable contact sheet, a bow reed, a push rod and a shaft sleeve; the lower part of the partition board of the microswitch is provided with round through holes; the shaft sleeve is arranged in the round through holes; the push rod forms a cylindrical shape and passes through the shaft sleeve in a movable matching form; both ends of the push rod are respectively connected to the movable contact sheet and the pressure bearing plate in a point contact form. The temperature controller has the advantages of compact structure and better sealing performance. When combustible gases or steam are exploded in the switch box, the switch box can not be damaged. Besides, the explosion in the switch box can not be spread to adjacent external combustible gases or steam. Therefore, the utility model conforms to the requirements of an explosion-proof electric apparatus.

Description

Explosion-proof thermostat

Technical field

The utility model relates to mechanical type temperature control technology field, is used to the explosion-proof thermostat of controlling the refrigerant compressor start and shutting down in particularly a kind of refrigerator.

Background technology

Explosion-proof thermostat is widely used in the control of refrigerator refrigeration, existing explosion-proof thermostat has main body, bellows is housed in main body, bearing plate, regulate extension spring, sensitive switch, this sensitive switch has switch enclosure, dividing plate, binding post, moving contact, fixed contact, movable contact spring, the bow spring, push rod is formed, described the lower partition is provided with round tube hole, push rod is flat-shaped, its two ends are connected with supporting way with bearing plate with movable contact spring respectively, because push rod is moving up and down and in the space, the left and right sides at this through hole, so exist very big gap between push rod and the through hole, therefore, the switch contact of existing explosion-proof thermostat all is communicated with outside air, at the civil power alternating current 220V, rated current 4A, under the situation of starting current 24A, can produce electric spark in the electric shock make and break process, if there is flammable explosive gas then can set off an explosion on every side.At present, because environmental requirement, some refrigerator is to adopt hydrocarbon flammable and explosive substance media (refrigerant) such as (HC).And wherein the evaporator of some refrigerator is mounted in the casing, and the thermostat body also is mounted in the casing, just in case during the evaporator dielectric leakage, the arc spark of sensitive switch generation may be lighted these media and sets off an explosion in the explosion-proof thermostat.

Summary of the invention

For overcoming the deficiencies in the prior art, the utility model provides a kind of explosion-proof thermostat.

The utility model is achieved through the following technical solutions: a kind of explosion-proof thermostat, bellows, bearing plate, adjusting extension spring, sensitive switch are housed in the main body of this thermostat, this sensitive switch is made up of switch enclosure, dividing plate, binding post, moving contact, fixed contact, movable contact spring, bow spring, push rod, axle sleeve, described the lower partition is provided with round tube hole, and in this round tube hole, be provided with axle sleeve, described push rod is cylindrical, pass axle sleeve in mode movingly, contact is connected with bearing plate point with movable contact spring respectively at its two ends.

The course of work is as follows: at first, sensitive switch is in off-state, when temperature rises, bellows expansion promotes push rod and slowly moves to left, bow spring upset when arriving critical localisation, sensitive switch is connected, on the contrary switch disconnects, because push rod and axle sleeve are movingly, its gap is very little, and its mating surface has long enough, therefore can realize the flame proof function, be a kind of closed tripper, meet the requirement of explosion-proof electric equipment.

The beneficial effects of the utility model: because push rod and axle sleeve adopt cylindrical being slidingly matched, so its fit clearance is very little, length of fit is enough big, in the time of so guaranteeing the imflammable gas stipulated when designing institute or steam at the switch enclosure internal explosion, can not damage switch enclosure, also the blast of switch enclosure inside can not propagated to adjacent outside imflammable gas or steam, this structure belongs to closed tripper, meets the requirement of explosion-proof electric equipment.

Description of drawings

Fig. 1 is the cutaway view of switch enclosure of the present utility model;

Fig. 2 is the left view of Fig. 1;

Fig. 3 is the right view of Fig. 1;

Fig. 4 is the cutaway view of axle sleeve of the present utility model;

Fig. 5 is the right view of Fig. 4.

Embodiment

Fig. 1, among Fig. 2, Fig. 3, Fig. 4, Fig. 5, a kind of explosion-proof thermostat, bellows, bearing plate, adjusting extension spring, sensitive switch are housed in the main body of this thermostat, this sensitive switch is made up of switch enclosure 1, dividing plate 2, binding post 3, moving contact 4, fixed contact 5, movable contact spring 6, bow spring 7, push rod 8 and axle sleeve 9, be provided with round tube hole 10 in dividing plate 2 bottoms, and in this round tube hole 10, axle sleeve 9 is set, described push rod 8 is cylindrical, pass axle sleeve 9 in mode movingly, contact is connected with bearing plate point with movable contact spring 6 respectively at its two ends.Fixed contact 5 passes switch enclosure 1 by binding post 3 and draws the outside, moving contact 4 passes switch enclosure 1 by movable contact spring 6 and binding post 3 and draws the outside, switch enclosure 1 and dividing plate 2 junction epoxy sealings, binding post 3 is also used epoxy sealing with switch enclosure 1 junction.During work, at first, sensitive switch is in off-state, when the temperature rising, bellows expansion promotes push rod and slowly moves to left, bow spring 7 upsets when arriving critical localisation, sensitive switch is connected, otherwise switch disconnects, because push rod 8 and axle sleeve 9 are movingly, its gap is very little, and its mating surface has long enough, therefore can realize the flame proof function, be a kind of closed tripper, meets the requirement of explosion-proof electric equipment.

Claims

1. explosion-proof thermostat, in the main body of this thermostat, bellows is housed, bearing plate, regulate extension spring, sensitive switch, this sensitive switch has switch enclosure (1), dividing plate (2), binding post (3), moving contact (4), fixed contact (5), movable contact spring (6), bow spring (7), push rod (8) and axle sleeve (9) are formed, it is characterized in that: the dividing plate of described sensitive switch (2) bottom is provided with round tube hole (10), and in this round tube hole (10), be provided with axle sleeve (9), described push rod (8) is cylindrical, pass axle sleeve (9) in mode movingly, contact is connected with bearing plate point with movable contact spring (6) respectively at its two ends.