CN108257818B - Pressure type temperature controller with sealed switch box - Google Patents
Pressure type temperature controller with sealed switch box Download PDFInfo
- Publication number
- CN108257818B CN108257818B CN201810320922.9A CN201810320922A CN108257818B CN 108257818 B CN108257818 B CN 108257818B CN 201810320922 A CN201810320922 A CN 201810320922A CN 108257818 B CN108257818 B CN 108257818B
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- China
- Prior art keywords
- switch box
- push rod
- section
- temperature controller
- sealing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/02—Details
- H01H37/04—Bases; Housings; Mountings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/02—Details
- H01H37/32—Thermally-sensitive members
- H01H37/36—Thermally-sensitive members actuated due to expansion or contraction of a fluid with or without vaporisation
- H01H37/38—Thermally-sensitive members actuated due to expansion or contraction of a fluid with or without vaporisation with bellows
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Thermally Actuated Switches (AREA)
- Push-Button Switches (AREA)
Abstract
A pressure type temperature controller sealed by a switch box comprises a switch box assembly, a corrugated pipe assembly, a main body assembly and the like, wherein the switch box assembly is provided with a rubber diaphragm with a corrugated film structure, the four peripheries of the switch box assembly are fixedly sealed with the switch box and the heat insulation, and the central head part of the switch box assembly is sleeved and sealed on a sealing section of a push rod, so that the airtight sealing is realized without affecting the normal action of the push rod. The pressure type temperature controller has the characteristics of small volume, low cost and reliable and durable sealing, and is particularly suitable for the application of pressure type temperature controllers requiring large rated current (such as 25A) in explosion-proof occasions.
Description
Technical Field
The invention relates to the technical field of temperature controllers, in particular to a pressure type temperature controller sealed by a switch box.
Background
The pressure type temperature controller is widely used for refrigerators, freezers, window type air conditioners and the like as temperature control components. The pressure type temperature controller consists of a corrugated pipe assembly, a switch assembly and a main body assembly, special working medium gas is filled in the corrugated pipe assembly, the corrugated pipe stretches out and draws back along with the change of temperature sensing temperature and internal pressure, a bearing plate in the main body assembly is pushed to swing, and the on-off of the switch is pushed by a push rod, so that the on-off of the compressor is controlled, and the temperature control is realized.
The contact in the switch component of the pressure type temperature controller can generate electric spark when being switched on and off, and the pressure type temperature controller is required to be explosion-proof along with the application of natural environment-friendly combustible refrigerants such as isobutane, propane and the like in refrigerators, freezers and window type air conditioners at present, that is to say, the contact electric spark is required to be prevented from igniting surrounding explosive gas.
Chinese patent CN2412189Y, explosion-proof pressure type thermostat, discloses an explosion-proof structure that adopts the movable fit of a cylindrical push rod and a circular through hole of a partition plate, allowing explosive gas to enter a switch cavity through the fit gap, but through a small enough fit gap and a long enough fit length, the explosive gas in the switch cavity will not transmit combustion flame to the outside even if the explosive gas is ignited by contact spark. The explosion-proof structure accords with national standard GB3836.8 part 8 of explosive environment: the "closed circuit breaker" requirement of the "n" type protected equipment ". The explosion-proof structure has the advantages of simple structure, compact volume, reliable action and easy mass production, but the maximum rated current allowed by the closed circuit breaker according to national standard GB3836.8 is only 16A. For applications with rated currents greater than 16A, such an explosion-proof arrangement cannot be used.
In the case of explosion protection in addition to rated current greater than 16A, other explosion protection structures other than the "closed circuit breaker" structure must be used. The Chinese patent CN2497241Y discloses another explosion-proof structure, namely a sealing device structure of national standard GB3836.8 is adopted, the whole temperature controller main body is sealed by a shell, a terminal outlet, a capillary outlet and the like are sealed by glue, and a temperature regulating shaft is sealed by an O-shaped rubber sealing ring. But this structure has the following drawbacks:
1. this structure needs great seal housing to whole pressure temperature controller main part seal, leads to pressure temperature controller volume increase, has influenced pressure temperature controller's installation and use. The larger seal housing also results in an increase in manufacturing costs.
2. The structure needs to be glued and sealed in a large area, and the sealing leakage condition is easy to occur, so that the sealing structure is invalid.
3. The structure can rub with the O-shaped rubber sealing ring when the adjusting shaft is rotated due to temperature adjustment, so that abrasion is easy to occur after long-term use, and sealing failure is caused.
Disclosure of Invention
The invention aims to provide a pressure type temperature controller sealed by a switch box, which can realize the complete airtight sealing of a switch assembly arranged in the switch box without influencing the normal action of a switch, meets the structural requirement of a sealing device of national standard GB3836.8, and is suitable for application occasions with rated current larger than 16A and explosion prevention requirement.
The technical proposal of the invention is as follows:
a pressure type temperature controller sealed by a switch box comprises a switch box 1, a movable contact piece 2, a bow spring 3, a C terminal 4, an L terminal 5, a contact screw 6, a movable contact 7, a fixed contact 8, a partition plate 10, a push rod 11, a corrugated pipe component 12, a bearing plate 13, an adjusting plate 14, a tension spring component 15, a main body 16, a support 17 and an adjusting shaft component 18, wherein the part, which penetrates through the switch box 1 and stretches out of the outside, of the C terminal 4 and the L terminal 5 is sealed by a 1 st rubber seal 1-1, the contact screw 6 is sealed by a 2 nd rubber seal 1-2 after being adjusted, a rubber membrane 9 is further arranged, the rubber membrane 9 is formed by three parts of a center head 9-1, a corrugated membrane 9-2 and a thick frame 9-3, wherein the center head 9-1 is in interference fit with the sealing section 11-2 of the push rod 11, the push rod 11 is formed by the movable fit section 11-1, the sealing section 11-2 and the tail end section 11-3, the movable fit section 11-1 of the push rod 11 is in clearance fit with the partition plate 10-1, the switch box 1 is provided with four corresponding lugs 10-1 and the fourth lug 10-2 is installed on the periphery of the fourth lug 10-1 and the fourth lug 10-1 is installed on the periphery of the fourth lug 10-1 through the fourth lug 10-2, and the fourth lug 10-1 is installed on the fourth lug 2 is in the periphery of the fourth lug 2, and the fourth lug 2 is in the peripheral flange 1 is in the sealing joint with the fourth lug 1.
The cross sections of the movable fit section 11-1, the sealing section 11-2 and the tail end section 11-3 of the push rod 11 are all round, and the through holes 10-1 of the partition plate and the central hole of the central head 9-1 of the rubber diaphragm 9 are correspondingly round. The diameter of the sealing section 11-2 of the push rod 11 is the smallest, and the diameter of the tail end section 11-3 is slightly larger than the diameter of the sealing section 11-2; the length of the sealing section 11-2 is slightly longer than the length of the central head 9-1 of the rubber membrane 9.
The innovation points of the invention are as follows: the switch box is sealed by adopting the flexible rubber diaphragm, the switch assembly is separated from inflammable gas, meanwhile, the smooth action of the push rod is ensured, and the pressure type temperature controller with the sealed switch box is formed.
Compared with the prior art, the invention has the following remarkable effects:
1. only the switch component part of the pressure type temperature controller is sealed, so that the whole volume of the temperature controller is basically not increased, and the installation and the use of the temperature controller are not affected; the manufacturing cost of the temperature controller is also lower.
2. Because the rubber diaphragm is adopted for compressing and sealing, the sealing is simple and reliable, and the mass production is easy.
3. The rubber diaphragm used as the sealing element does not move in a friction way, so that the problem of abrasion is avoided, and the long-term reliability of the sealing effect is ensured.
Drawings
Fig. 1 is a schematic view of the internal structure of a pressure type thermostat sealed by a switch box according to the present invention.
Fig. 2 is a schematic diagram of the structure of the separator, the rubber membrane and the switch box shown in fig. 1.
Fig. 3 is a left side view of the rubber diaphragm of fig. 1.
Fig. 4 is a left side view of the switch box of fig. 1.
Fig. 5 is a left side view of the spacer shown in fig. 1.
The reference numerals in the figures denote: 1. the switch box, 1-1, 1 st glue seal, 1-2, 2 nd glue seal, 1-3, 1 st mounting ear, 2, movable contact, 3, bow spring, 4, C terminal, 5, L terminal, 6, contact screw, 7, movable contact, 8, static contact, 9, rubber diaphragm, 9-1, center head, 9-2, bellows, 9-3, thick frame, 10, baffle, 10-1, baffle through hole, 10-2, 2 nd mounting ear, 11, push rod, 11-1, movable fit section, 11-2, seal section, 11-3, tail end section, 12, bellows assembly, 13, bearing plate, 13-1, bearing plate fulcrum, 14, adjusting plate, 15, tension spring assembly, 16, main body, 17, bracket, 18, adjusting shaft assembly, 19, self-tapping screw.
Detailed Description
The invention is further illustrated by the following examples.
Referring to fig. 1 to 5, a pressure type temperature controller sealed by a switch box comprises a switch box 1, a movable contact piece 2, a bow spring 3, a C terminal 4, an L terminal 5, a contact screw 6, a movable contact 7, a fixed contact 8, a baffle 10, a push rod 11, a corrugated pipe component 12, a bearing plate 13, an adjusting plate 14, a tension spring component 15, a main body 16, a support 17 and an adjusting shaft component 18, wherein the C terminal 4 and the L terminal 5 penetrate through the switch box 1 and extend out of the outside, are sealed by a 1 st rubber seal 1-1, the contact screw 6 is sealed by a 2 nd rubber seal 1-2 after being adjusted, a rubber membrane 9 is further arranged, the rubber membrane 9 is formed by three parts of a central head 9-1, a corrugated membrane 9-2 and a thick frame 9-3, the central head 9-1 is in interference fit with the sealing section 11-2 of the push rod 11, the push rod 11 is formed by three parts of the movable fit section 11-1, the sealing section 11-2 and the tail end section 11-3, the movable fit section 11-1 of the push rod 11 and the baffle 10-1 are in clearance fit with the through hole 10-1, the fourth rubber seal 1 and the fourth rubber membrane 9 is arranged on the periphery of the fourth diaphragm 1 and is in a matched with the fourth diaphragm 1 and the fourth diaphragm is arranged on the periphery of the fourth diaphragm and is in a matched with the periphery of the fourth diaphragm 1 and the fourth diaphragm 1 is arranged.
The cross sections of the movable fit section 11-1, the sealing section 11-2 and the tail end section 11-3 of the push rod 11 are all round, and the through holes 10-1 of the partition plate and the central hole of the central head 9-1 of the rubber diaphragm 9 are correspondingly round. The diameter of the sealing section 11-2 of the push rod 11 is the smallest, and the diameter of the tail end section 11-3 is slightly larger than the diameter of the sealing section 11-2; the length of the sealing section 11-2 is slightly longer than the length of the central head 9-1 of the rubber membrane 9.
The working process of the pressure type temperature controller sealed by the switch box is that when the temperature sensing temperature rises or falls, the corrugated pipe component 12 expands or contracts, so that the bearing plate 13 swings anticlockwise or clockwise around the supporting point 13-1, the push rod 11 is pushed to slide left and right along the through hole 10-1 of the partition board 10, and the outer tail end of the movable matching section 11-1 of the push rod 11 pushes the micro switch to be turned on or off. During this process, the central head 9-1 of the rubber diaphragm 9 follows the push rod 11, while the thick rim 9-3 is stationary and the bellows 9-2 is slightly elastically deformed. Since the bellows film 9-2 is thin, the elastic deformation force generated is small, and the free sliding of the push rod 11 from side to side is not substantially affected.
The push rod 11 and the through hole 10-1 of the partition board 10 adopt circular cross sections, the diameter of the sealing section 11-2 is minimum, the diameter of the movable fit section 11-1 is slightly larger than that of the sealing section 11-2, the length of the sealing section 11-2 is slightly longer than that of the central head 9-1 of the rubber diaphragm, the central head 9-1 of the rubber diaphragm can be installed into the sealing section 11-2 of the push rod through elastic deformation, and the sealing section is kept not to fall off in the movement of the push rod.
The thick border 9-3 of the rubber diaphragm 9 and the corresponding matching parts of the switch box 1 and the partition board 10 are manufactured into inclined stages so as to avoid the interference of the main body 16.
The rubber diaphragm 9 is manufactured by a compression molding vulcanization method, and the switch box 1, the partition board 10 and the push rod 9 are formed by injection molding of a plastic mold.
The manufacturing process of the pressure type temperature controller sealed by the switch box comprises the steps of riveting and assembling a movable contact piece 2, a bow spring 3, a C terminal 4, an L terminal 5, a contact screw 6, a movable contact 7 and a fixed contact 8 on the switch box 1 to form a micro switch, then installing a rubber diaphragm 9, a push rod 11 and a partition board 10, tightly assembling the micro switch box into a sealed switch box assembly by using four self-tapping screws 19, then installing the sealed switch box assembly into a temperature controller main body 16, and performing glue sealing after the operation temperature is adjusted and detected to be qualified. The pressure type temperature controller manufactured in this way meets the structural requirement of the sealing device of GB3836.8, and various relevant tests of the sealing device of GB3836.8 are passed. The maximum rated current of the pressure type temperature controller sealed by the switch box can reach 25A.
In order to increase the current passing capability, one or two pieces of overcurrent copper sheets can be riveted at the movable contact piece 2 in parallel, and the sizes of the movable contact 7 and the fixed contact 8 are increased, so that the rated current can reach 25A.
The pressure type temperature controller sealed by the switch box can also be made into a pressure type temperature controller with three terminals of a single-pole double-throw switch structure.
The pressure type temperature controller sealed by the switch box not only can be applied to explosion-proof occasions, but also can be applied to pilot control occasions with low voltage and small current and/or high pollution environment occasions such as dust and the like, so that contact pollution is prevented, and reliable electrical contact is ensured.
Claims (3)
1. The utility model provides a sealed pressure formula temperature controller of switch box, including switch box (1), movable contact piece (2), bow spring (3), C terminal (4), L terminal (5), contact screw (6), movable contact (7), static contact (8), baffle (10), push rod (11), bellows subassembly (12), bearing plate (13), regulating plate (14), extension spring subassembly (15), main part (16), support (17), regulating shaft subassembly (18), wherein C terminal (4), L terminal (5) pass switch box (1) stretch out external position and seal (1-1) with 1 st glue, contact screw (6) seal with 2 nd glue (1-2) after the adjustment, its characterized in that: the novel switch box is characterized in that the novel switch box is further provided with a rubber membrane (9), the rubber membrane (9) is composed of a central head portion (9-1), a corrugated membrane (9-2) and a thick frame (9-3), the central head portion (9-1) is in interference fit with a sealing section (11-2) of the push rod (11), the push rod (11) is composed of a movable fit section (11-1), the sealing section (11-2) and a tail end section (11-3), the movable fit section (11-1) of the push rod (11) is in clearance fit with a partition plate through hole (10-1), four 1 st mounting lugs (1-3) and 2 nd mounting lugs (10-2) which are matched with each other are respectively arranged on the outer sides of the switch box (1) and the partition plate (10), the four 1 st mounting lugs (1-3) and the 2 nd mounting lugs (10-2) are fastened through four self-tapping screws (19), and the periphery of an opening of the partition plate (10) and the thick frame (9-3) of the rubber membrane are in interference fit.
2. The switch box sealed pressure thermostat of claim 1, wherein: the cross sections of the movable fit section (11-1), the sealing section (11-2) and the tail end section (11-3) of the push rod (11) are all round, and the central holes of the partition through hole (10-1) and the central head part (9-1) of the rubber diaphragm (9) are also round correspondingly.
3. The switch box sealed pressure thermostat of claim 2, wherein: the diameter of the sealing section (11-2) of the push rod (11) is the smallest, and the diameter of the tail end section (11-3) is slightly larger than the diameter of the sealing section (11-2); the length of the sealing section (11-2) is slightly longer than the length of the central head (9-1) of the rubber membrane (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810320922.9A CN108257818B (en) | 2018-04-11 | 2018-04-11 | Pressure type temperature controller with sealed switch box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810320922.9A CN108257818B (en) | 2018-04-11 | 2018-04-11 | Pressure type temperature controller with sealed switch box |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108257818A CN108257818A (en) | 2018-07-06 |
| CN108257818B true CN108257818B (en) | 2023-09-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810320922.9A Active CN108257818B (en) | 2018-04-11 | 2018-04-11 | Pressure type temperature controller with sealed switch box |
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| Country | Link |
|---|---|
| CN (1) | CN108257818B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2365704Y (en) * | 1998-12-07 | 2000-02-23 | 佛山通宝股份有限公司 | Large on-off temperature differential ordinary pressing temperature controller |
| CN2497241Y (en) * | 2001-09-24 | 2002-06-26 | 佛山通宝股份有限公司 | Explosion-proof pressure-type temperature controller |
| CN2524358Y (en) * | 2002-01-09 | 2002-12-04 | 陈永龙 | Small expansion pressurized regulatable temperature controller |
| CN102751138A (en) * | 2012-06-21 | 2012-10-24 | 浙江花园电子器材有限公司 | Sealing device for electric switch of explosion-proof thermostat |
| CN204332829U (en) * | 2014-12-16 | 2015-05-13 | 江西通达电器有限公司 | A kind of compression-type temperature controller |
| CN208368426U (en) * | 2018-04-11 | 2019-01-11 | 佛山通宝华通控制器有限公司 | A kind of compression-type temperature controller of switch enclosure sealing |
-
2018
- 2018-04-11 CN CN201810320922.9A patent/CN108257818B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2365704Y (en) * | 1998-12-07 | 2000-02-23 | 佛山通宝股份有限公司 | Large on-off temperature differential ordinary pressing temperature controller |
| CN2497241Y (en) * | 2001-09-24 | 2002-06-26 | 佛山通宝股份有限公司 | Explosion-proof pressure-type temperature controller |
| CN2524358Y (en) * | 2002-01-09 | 2002-12-04 | 陈永龙 | Small expansion pressurized regulatable temperature controller |
| CN102751138A (en) * | 2012-06-21 | 2012-10-24 | 浙江花园电子器材有限公司 | Sealing device for electric switch of explosion-proof thermostat |
| CN204332829U (en) * | 2014-12-16 | 2015-05-13 | 江西通达电器有限公司 | A kind of compression-type temperature controller |
| CN208368426U (en) * | 2018-04-11 | 2019-01-11 | 佛山通宝华通控制器有限公司 | A kind of compression-type temperature controller of switch enclosure sealing |
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| Publication number | Publication date |
|---|---|
| CN108257818A (en) | 2018-07-06 |
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