CN2392252Y - Negative pressure type wind pressure switch - Google Patents
Negative pressure type wind pressure switch Download PDFInfo
- Publication number
- CN2392252Y CN2392252Y CN 99229434 CN99229434U CN2392252Y CN 2392252 Y CN2392252 Y CN 2392252Y CN 99229434 CN99229434 CN 99229434 CN 99229434 U CN99229434 U CN 99229434U CN 2392252 Y CN2392252 Y CN 2392252Y
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- CN
- China
- Prior art keywords
- plastic housing
- barrier film
- sealing
- platform
- spring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to a negative pressure type wind pressure switch, which is especially suitable for a strong exhaust type gas water-heater. The negative pressure type wind pressure switch comprises a plastic shell, a metal shell, a septum, a micro switch, a spring and a shim. The plastic shell is provided with a sealing platform and a sealing slot and the metal shell is provided with at least six folding edges which are evenly distributed and tight matched with the plastic shell. The septum is integration type, and the periphery is not only provided with the platform and a convex rib which are matched with the plastic shell platform and the sealing slot, but also provided with a thin arc-shaped ring. The sealability is good and the moving of the septum is flexible, and thus, opening and closed wind pressure can be kept a long time in the scope of design, and the use safety of the gas water-heater is enhanced.
Description
The utility model relates to a kind of suction type blast switch, is specially adapted to strong air-exhaust type gas heater, can guarantee its safe handling.
Fail safe when gas heater uses is the problem that the producers and consumers pays close attention to always.The strong air-exhaust type gas heater of exploitation is electronic air exhausting device of configuration and a blast switch in water heater at present, this water heater only possesses when forcing air draft and air draft speed to reach certain standard, sensitive switch on the blast switch, could connect the circuit and the gas valve switch circuit of gas ignition device, combustion gas could be burnt, otherwise, then do not have combustion gas and discharge, thus the fail safe that assurance is used.This shows that the sensitivity and the stability thereof of blast switch is depended in the fail safe of this class gas heater.Existing blast switch is because two housing connects for point and tie point is few, and the inner surface that two housings are in contact with one another is the plane; The diaphragm center perforate, the thickness homogeneous is connected with the shell stickup.Therefore sealing effectiveness difference and barrier film move sensitively inadequately, and after long-term the use, the startup of blast switch and close blast and be difficult to remain in the scope of design is so the fail safe of gas heater can't guarantee.
The purpose of this utility model is to provide a kind of and start blast and close blast long suction type blast switch of retention time in scope of design.
The technical scheme that realizes the utility model purpose is: a kind of suction type blast switch, the metal-back that comprises plastic housing and outside band sensitive switch, between two shells barrier film is arranged, in the chamber between plastic housing and the barrier film pad is housed, spring, the axis of the contact of sensitive switch and barrier film, plastic housing, metal-back, the dead in line of pad and spring, its plastic housing has 1 valve, there is the passage that holds spring at the center, plastic housing inner surface periphery has sealing platform and sealing ditch, the passage periphery that stretches into plastic housing inside has spoke shape reinforcement, there is air-vent on the metal-back surface, the neighboring have at least 6 equally distributed, close-fitting with plastic housing, can roll up the flanging of pressure, barrier film is that integral type and thickness do not wait, at it radially, ecto-entad is followed successively by the ring packing platform with the sealing platform of plastic housing coupling, sealing ditch ring packing convex tendon that mates and the bow-shaped ring that approaches with plastic housing, the center of barrier film, one side has the boss with pad and spring coupling, opposite side has the boss with the contact of sensitive switch coupling, and the back of a bow of thin bow-shaped ring is towards plastic housing.
Above-mentioned suction type blast switch, the height of its plastic housing inner surface spoke shape reinforcement and the height that stretches into the passage of plastic housing inside all are lower than its periphery sealing platform.
Technique effect of the present utility model is: the plastic housing of suction type blast switch of the present utility model adopts sealing platform and sealing ditch double sealing structure, with the equally distributed flanging volume of metal-back periphery compression molding material shell, increase stress point and stressed even, barrier film is originally as integral type, the hermetically-sealed construction of its peripheral structure and plastic housing matches, need not to paste, so product hermeticity and good stability thereof.In addition, because the barrier film periphery has thin bow-shaped ring, the height of table reinforcement and passage all is lower than its periphery sealing platform in the plastic housing, so, barrier film move flexibly and sensitivity good, sensitiveer to the control of sensitive switch contact.Like this, the blast that opens and closes of the present utility model can keep the long period in scope of design, guarantees that the gas heater safety in utilization improves.
Embodiment below in conjunction with accompanying drawing provides is further described in detail the utility model.
Fig. 1 is the structural representation of the utility model suction type blast switch
Fig. 2 is a plastic housing inner surface structure schematic diagram of the present utility model
Fig. 3 is the right view of Fig. 2
Fig. 4 is a metal-back inner surface structure schematic diagram of the present utility model, and its periphery has 8 flangings
Fig. 5 is the left view of Fig. 4
Fig. 6 is the cutaway view of barrier film of the present utility model
Shown in Fig. 1～6, a kind of suction type blast switch, the metal-back 2 that comprises plastic housing 1 and outside band sensitive switch 12, between two shells barrier film 7 is arranged, in the chamber between plastic housing 1 and the barrier film 7 pad 14 is housed, spring 11, the axis of the contact 19 of sensitive switch 12 and barrier film 7, plastic housing 1, metal-back 2, the dead in line of pad 14 and spring 11, it is characterized in that, the plastic housing 1 that has 1 valve 5, there is the passage 18 that holds spring 11 at the center, plastic housing 1 inner surface periphery has sealing platform 3 and sealing ditch 4, passage 18 peripheries that stretch into plastic housing 1 inside have spoke shape reinforcement 17, there is air-vent 13 on metal-back 2 surfaces, the neighboring have at least 6 equally distributed, close-fitting with plastic housing 1, can roll up the flanging 6 of pressure, barrier film 7 is that integral type and thickness do not wait, at it radially, ecto-entad is followed successively by the ring packing platform 8 with sealing platform 3 coupling of plastic housing 1, sealing ditch 4 ring packing convex tendon 9 that mates and the bow-shaped ring 10 that approaches with plastic housing 1, the center of barrier film 7, one side has the boss 15 with pad 14 and spring 11 couplings, opposite side has the boss 16 with contact 19 coupling of sensitive switch 12, and the back of a bow of thin bow-shaped ring 10 is towards plastics 1.
The utility model suction type blast switch, the height of its plastic housing 1 inner surface spoke shape reinforcement 17 and the height that stretches into the passage 18 of plastic housing 1 inside all are lower than its periphery sealing platform 3.
The barrier film 7 of the utility model suction type blast switch is the elastomeric material one-step die casting, the bow-shaped ring 10 that it is thin, and thickness is about 0.1mm usually.Elastomeric material is silicon rubber preferably.Like this, not only the mobile sensitivity of barrier film 7 improves, and utilizes the superior elasticity of silicon rubber itself and mobile sensitivity and the useful life that thermal endurance can further improve barrier film 7.
Plastic housing 1 of the present utility model preferably adopts the heat-proof ABS plastics, utilizes its thermal endurance and deformation resistance, can further improve sealing effectiveness.
Metal-back 2 of the present utility model, periphery flanging 6 are at least 6, increase the sealing that flanging 6 can improve two housings, and common 8 flangings 6 can satisfy the requirement of sealing.In addition, the air-vent 13 on metal-back 2 surfaces is mainly used in the cavity internal pressure that barrier film 7 and metal-back 2 are formed and keeps equating with atmospheric pressure, and then guarantees to open and close blast in scope of design.
Suction type blast switch of the present utility model is specially adapted to strong air-exhaust type gas heater.When assembling suction type blast switch of the present utility model, sensitive switch 12 fits together with metal-back 2, and barrier film 7, pad 14, spring 11 fit together with plastic housing 1, then metal-back 2 is placed on the barrier film 7, and turnup compacting and folding 6 get final product.Suction type blast switch of the present utility model is installed on the gas heater, the valve 5 and the pressure exhaust duct of gas heater should be connected, and sensitive switch 12 is connected with firing circuit and gas valve switch circuit respectively and got final product.When using water heater, because there is air-vent 13 on metal-back 2 surfaces, remain with atmosphere in the chamber that barrier film 7 and metal-back 2 forms and communicate, open force air exhausting device after, in the chamber between barrier film 7 and the plastic housing 1 owing to force air draft to form negative pressure, barrier film 7 is offset to spring 11 directions, when negative pressure reached design load, the contact 19 of sensitive switch 12 ejected in metal-back 2 because of losing the pressure of spring 11, connect the gas ignition circuit and open the burnt gas valve circuit, combustion gas is lighted.When forcing air draft to stop or air draft speed when being reduced to design value, negative pressure value reduces in the chamber, and barrier film 7 moves to metal-back 2 directions under spring 11 effects, and the contact 19 of sensitive switch 12 is got back in the metal-back again.Gas ignition circuit and burnt gas valve switching circuit are closed, so just can prevent gas heater do not have to ventilate or the situation of deficiency in draught under work on and cause contingency, play the effect safe in utilization that guarantees.
Because its sealing of suction type blast switch of the present utility model and barrier film sensitivity are good, can guarantee the startup blast of blast switch and close blast retention time in scope of design long, both prolonged its useful life, also guaranteed the fail safe of gas heater.
Suction type blast switch of the present utility model also can be used for the break-make that other have control circuit in the product of forcing air exhausting device.
Claims (2)
1, a kind of suction type blast switch, the metal-back (2) that comprises plastic housing (1) and outside band sensitive switch (12), barrier film (7) is arranged between two shells, in the chamber between plastic housing (1) and the barrier film (7) pad (14) is housed, spring (11), the axis of the contact (19) of sensitive switch (12) and barrier film (7), plastic housing (1), metal-back (2), the dead in line of pad (14) and spring (11), it is characterized in that, the plastic housing (1) that has 1 valve (5), there is the passage (18) that holds spring (11) at the center, plastic housing (1) inner surface periphery has sealing platform (3) and sealing ditch (4), stretch into inner passage (18) periphery of plastic housing (1) spoke shape reinforcement (17) is arranged, there is air-vent (13) on metal-back (2) surface, the neighboring have at least 6 equally distributed, close-fitting with plastic housing (1), can roll up the flanging (6) of pressure, barrier film (7) is that integral type and thickness do not wait, at it radially, ecto-entad is followed successively by the ring packing platform (8) with the sealing platform (3) of plastic housing (1) coupling, with the ring packing convex tendon (9) of the sealing ditch (4) of plastic housing (1) coupling and the bow-shaped ring (10) that approaches, the center of barrier film (7), one side has the boss (15) with pad (14) and spring (11) coupling, opposite side has the boss (16) with the contact (19) of sensitive switch (12) coupling, and the back of a bow of thin bow-shaped ring (10) is towards plastic housing (1).
2, suction type blast switch according to claim 1 is characterized in that, the height of the passage (18) that the height of plastic housing (1) inner surface spoke shape reinforcement (17) is inner with stretching into plastic housing (1) all is lower than its periphery sealing platform (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99229434 CN2392252Y (en) | 1999-09-17 | 1999-09-17 | Negative pressure type wind pressure switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99229434 CN2392252Y (en) | 1999-09-17 | 1999-09-17 | Negative pressure type wind pressure switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2392252Y true CN2392252Y (en) | 2000-08-16 |
Family
ID=34018678
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99229434 Expired - Fee Related CN2392252Y (en) | 1999-09-17 | 1999-09-17 | Negative pressure type wind pressure switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2392252Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100364025C (en) * | 2005-03-11 | 2008-01-23 | 钱加灿 | Blast switch |
| CN104048718A (en) * | 2014-06-10 | 2014-09-17 | 成都秦川科技发展有限公司 | Pressure sensor special for secure cut-off type intelligent gas meter |
| CN105047473A (en) * | 2015-07-28 | 2015-11-11 | 东莞市康发特塑胶制品有限公司 | Automatic control differential pressure switch |
-
1999
- 1999-09-17 CN CN 99229434 patent/CN2392252Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100364025C (en) * | 2005-03-11 | 2008-01-23 | 钱加灿 | Blast switch |
| CN104048718A (en) * | 2014-06-10 | 2014-09-17 | 成都秦川科技发展有限公司 | Pressure sensor special for secure cut-off type intelligent gas meter |
| CN105047473A (en) * | 2015-07-28 | 2015-11-11 | 东莞市康发特塑胶制品有限公司 | Automatic control differential pressure switch |
| CN105047473B (en) * | 2015-07-28 | 2017-08-11 | 东莞市康发特塑胶制品有限公司 | Automatic control type pressure difference switch |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |