CN201319353Y

CN201319353Y - Anti-explosion temperature controller

Info

Publication number: CN201319353Y
Application number: CNU2008202174065U
Authority: CN
Inventors: 金华明
Original assignee: CHANGZHOU THERMOSTER ELECTRICAL APPLIANCE Co Ltd
Current assignee: Jiangsu Thermoster Electrical Appliance Co., Ltd.
Priority date: 2008-11-28
Filing date: 2008-11-28
Publication date: 2009-09-30
Anticipated expiration: 2018-11-28

Abstract

The utility model relates to an anti-explosion temperature controller, which consists of a main body and a substrate component, and is provided with a corrugated pipe, a driving arm, an adjusting plate, a tension spring, a substrate, an insulation plate, a contact leaf spring, a spring strip, a pin and the like. Both faces of the insulation plate are provided with a corresponding lug boss, and a round through hole is arranged inside the lug boss, and the total height of the lug boss is more than 6 mm. A push rod is integrally of a cross shape and is divided into a cylindrical section and a cross-shaped section, and the cylindrical section passes through the round through hole on the insulation plate to be contacted with the driving arm, and the cross-shaped section passes through a hole on the contact leaf spring to be connected with the contact leaf spring in a supporting way. The junction place between the substrate and the insulation plate is sealed by epoxide resin. The contact thickness between the pin and the substrate is more than or equal to 6 mm according to the anti-explosion requirements, and the junction part forms a lug boss in the direction of the pin. The anti-explosion temperature controller has the advantages that all junction places can be sealed without the epoxide resin material, thereby overcoming the weaknesses of the sealing material, and being applicable to the electric refrigerator adopting the inflammable explosive substation as the refrigerant.

Description

Explosion-proof thermostat

One, technical field

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

Two, background technology

Thermostat is widely used in the control of refrigerator refrigeration, and existing thermostat structure is seen figure one, and it is made up of main body 1 and base assembly.Main body 1 comprises dress adjustment plate 2 within it, extension spring 3, bellows 4, master arm 5, push rod 6, base assembly comprises, insulation board 7, base shell 8, fixed contact 9, moving contact 10, spring leaf 11, contact reed 12,

13,14 form, a square orifice 15 is arranged on the surface of insulation board 7, push rod 6 passes square opening, two ends are connected with supporting way with master arm 5 and contact reed 12 respectively, because push rod 6 is flat, very big gap is arranged between push rod 6 and the insulation board 7,

13,14 thickness that cooperate with base shell 8 do not reach explosion-proof minimum requirements 6mm, do not adopt to be tightly connected yet.The use epoxy resin that perhaps has seals; but owing to epoxy resin fragility shows the pliability of going on business greatly, so the protective layer that epoxide resin material is formed, be unable to undergo repeatedly bending " be full of cracks ", fault block, final morsel shape and stripping down just can take place.Do not adopt and be tightly connected or epoxy resin peels off, all will make the contact of existing thermostat be in the state that is communicated with outside air, under the situation of alternating voltage 220V, rated current 4A, starting current 24A, can produce electric spark in the contact make and break process, if flammable explosive gas is arranged then can set off an explosion on every side.At present, for environmental protection requirement, some refrigerators have adopted not fluorine-containing chemical substance as cold-producing medium, the main hydrocarbon of this cold-producing medium, and namely for methane, ethane and propane, and ethene, propylene etc., inflammable and explosive.The evaporator of some refrigerator is mounted in the casing, and thermostat also is installed in the casing, in case evaporator refrigerant leaks, the electric spark that the break-make of contact produces in the thermostat may be lighted cold-producing medium and cause an explosion accident.

Three, summary of the invention

The technical problems to be solved in the utility model is the contact in the thermostat will be sealed in the base shell, and electric spark and the flammable explosive gas around it that the contact break-make produces is isolated.

The technical solution that the utility model proposed is: a kind of explosion-proof thermostat, form by main body and base assembly, and the adjustment plate is housed in the described main body, connects spring, bellows, master arm, push rod; Described base assembly comprises insulation board, base shell, fixed contact, moving contact, contact reed, spring leaf, pin composition, on the described insulation board boss is arranged, in the middle of the boss is round tube hole, the through hole height is equal to or greater than 6mm, push rod passes round tube hole, and an end contacts with master arm, and the other end contacts with the contact reed, pin combines with base shell and forms boss, and contact thickness is equal to or greater than 6mm.

The purpose of this utility model can also further realize by following technical solution:

Foregoing explosion-proof type thermostat, the whole one-tenth of push rod crux is divided into two sections, the columniform part of left end is passed insulation board, become point to contact with master arm, porose on the described contact reed, the hole that the cross part of push rod is passed on the contact reed becomes support pattern to be connected with the contact reed.

Foregoing explosion-proof type thermostat, described insulation board is equal to or greater than 0.6mm with the thickness that contacts of base shell.

Foregoing explosion-proof type thermostat, described insulation board and base shell junction epoxy sealing.

Compared with prior art, the utlity model has following beneficial effect:

1, because push rod is that the hole axle cooperates with insulation board, and fit clearance is little, forms boss on the insulation board, length of fit is big; Equally, the fit clearance between pin and the base shell is also very little, and length of fit is big, even contact portion is not used epoxy sealing like this, also can guarantee the good sealing property of base shell inner space.When the flammable explosive gas of designing institute regulation or steam during at the base shell internal explosion, can not damage base shell, the base shell internal explosion can not propagated to inflammable and explosive all around gas or steam yet, this structure belongs to closed tripper, meets Ex " n " the type explosion-proof electric equipment requirement of IEC standard.

2, because the base shell internal capacity of sealing is little, if blast in its inside, then intensity is also little, so the quality of fit between push rod and insulation board boss round tube hole and pin and the base shell is less demanding.Working of plastics such as base shell and insulation board need not be thickeied, and pin and base shell engagement height reach requirement of explosion proof, so the surface that base shell cooperates with pin need not the seal ring epoxy resins, be easy to processing, make increase the useful life of this thermostat again,, be convenient to produce in enormous quantities so provide cost savings.

3, the design uniqueness of push rod, be divided into two parts, a part is cylindrical, can closely cooperate with the round tube hole on the insulation board, becomes point to contact with the active example, another part is a cross, can just be stuck on the square hole of contact reed, become support pattern to connect into line with the contact reed and contact, such design make push rod can be in through hole flexible movement, can well not fix and can come off again, and be easy to make and assembling.

4, described insulation board 7 is equal to or greater than 0.6mm with the thickness that contacts of base shell 8, makes that combination closely even do not adopt epoxy resin, also can reach the effect of sealing between the two.

5, because thermostat overall dimension just increases a little, basic the same with former thermostat, make things convenient for refrigerator producer to design the installation site of thermostat.

Four, description of drawings

Fig. 1: existing thermostat structural representation;

Fig. 2: the explosion-proof thermostat structural representation of embodiment of the present utility model;

Fig. 3: the profile of boss 15 shown in Figure 2;

Fig. 4: the structure enlarged drawing of push rod 6 shown in Figure 2.

Five, embodiment:

By following examples the utility model is further elaborated.

Referring to Fig. 2, Fig. 3, shown in Figure 4, embodiment of the utility model: the explosion-proof type compression-type temperature controller is made up of main body 1 and base assembly.Main body 1 comprises dress adjustment plate 2, extension spring 3, bellows 4, master arm 5, push rod 6 within it, and base assembly is made up of insulation board 7, base shell 8, fixed contact 9, moving contact 10, contact reed 11, spring leaf 12 and

13,14; There is boss in the central authorities of insulation board 7, and the centre is a round tube hole, and the through hole height is 6mm, and contact reed 11 is provided with the hole.Push rod 6 is whole to become cruxs, is divided into two sections, and the columniform part of left end is passed the round tube hole of insulation board 7, puts for 5 one-tenths with master arm to contact, and push rod 6 right-hand members are 11 one-tenth support patterns in hole and contact reed that cross part passes on the contact reed 11 and are connected.Fixed contact 9 passes base shell 8 by pin 14 and draws the outside, and moving contact 10 passes base shell 8 by spring leaf 12 and pin 13 and draws the outside, base shell 8 and insulation board 7 junction

epoxy sealings.Pin

13,14 and base shell 8 are combined closely, and form boss along

13,14 directions in base shell 8 outsides, more than the insulation board 7 thick 0.6mm, more than the boss height 6mm, to contact thickness with joint portion between the

13,14 be more than the 6.6mm to insulation board 7 like this, and insulation board contacts more than the thickness 0.6mm with base shell.With thermostat shown in the present embodiment and power connection, when temperature descends, bellows 4 shrinks, and move with spring, push rod 6 is slowly moved, when arriving critical localisation to the master arm direction, spring leaf 12 upsets, fixed contact 9, moving contact 10 separates and disconnects, and when temperature raise, bellows elongation and the elastic force that overcomes spring were switch contacts.

Claims

1, a kind of explosion-proof thermostat is made up of main body (1) and base assembly, adjustment plate (2) is housed in the described main body (1), connects spring (3), bellows (4), master arm (5), push rod (6); Described base assembly comprises insulation board (7), base shell (8), fixed contact (9), moving contact (10), contact reed (11), spring leaf (12), pin (13), (14) composition, it is characterized in that: boss (71) is arranged on the described insulation board (7), in the middle of the boss is round tube hole, the through hole height is equal to or greater than 6mm, push rod (6) passes round tube hole, one end contacts with master arm (5), the other end contacts with contact reed (12), pin (14) combines with base shell (8) and forms boss (15), and contact thickness is equal to or greater than 6mm.

2, explosion-proof thermostat according to claim 1, it is characterized in that: the whole one-tenth of described push rod (6) crux, be divided into two sections, the columniform part of left end is passed the round tube hole on the insulation board (7), become point to contact with master arm (5), described contact reed (11) is provided with the hole, and push rod (6) right-hand member is hole and the contact reed (11) that cross part passes on the contact reed (11) and becomes support pattern to be connected.

3, explosion-proof thermostat according to claim 1 is characterized in that: described insulation board (7) is equal to or greater than 0.6mm with the thickness that contacts of base shell (8).

4, explosion-proof thermostat according to claim 1 is characterized in that: described insulation board (7) and base shell (8) junction epoxy sealing.