CN112786354A - Liquid expansion type temperature limiter with environment temperature compensation function - Google Patents
Liquid expansion type temperature limiter with environment temperature compensation function Download PDFInfo
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- CN112786354A CN112786354A CN202110134962.6A CN202110134962A CN112786354A CN 112786354 A CN112786354 A CN 112786354A CN 202110134962 A CN202110134962 A CN 202110134962A CN 112786354 A CN112786354 A CN 112786354A
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- temperature
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- bimetal disc
- push rod
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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
- H01H37/32—Thermally-sensitive members
- H01H37/36—Thermally-sensitive members actuated due to expansion or contraction of a fluid with or without vaporisation
- H01H37/40—Thermally-sensitive members actuated due to expansion or contraction of a fluid with or without vaporisation with diaphragm
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- Thermally Actuated Switches (AREA)
Abstract
The utility model provides a bimetal disc and tray that liquid inflation formula limit for temperature ware with ambient temperature compensation is equipped with the mutual contact and connects between diaphragm capsule summit and push rod, and this bimetal disc upper strata is passive layer, and the lower floor is the initiative layer, and the circumference outer fringe of bimetal disc is connected for clearance fit with the diaphragm of diaphragm capsule erects the limit inner wall, and its circumference outer fringe portion still is connected with the circumferential edge reason contact of the tray that is located the below, and bimetal disc central part and tray central part are connected with diaphragm capsule summit and push rod contact respectively. The liquid expansion type temperature limiter can realize accurate ambient temperature compensation at different action temperatures, and greatly improves the action temperature precision; meanwhile, the switch has the switching performance of large current overcurrent capacity and small electromagnetic interference.
Description
Technical Field
The invention relates to the technical field of liquid expansion type temperature limiters, in particular to a liquid expansion type temperature limiter with environment temperature compensation.
Background
The liquid expansion type temperature limiter is widely applied to household electric heating appliances such as electric heating fans, electric water heaters, electric ovens, electric heating deep fryer and the like. The Chinese patent discloses a manual reset liquid expansion type temperature limiter with a publication number of CN107610976B, which comprises a switch box assembly, a partition board, a push rod 10, a reset rod 7, an adjusting screw 8, a diaphragm capsule 9, a capillary tube 11, a temperature sensing bulb 12 and the like. The diaphragm capsule 9, the capillary tube 11 and the temperature sensing bulb 12 form a temperature sensing assembly, liquid working medium is filled and sealed in the temperature sensing assembly, when the liquid working medium expands due to heating, the generated volume increment flows to the diaphragm capsule 9 to enable the two diaphragms of the diaphragm capsule to be relatively opened, and the top of the diaphragm capsule 9 directly pushes the push rod 10 to push the switch box assembly to perform switching action. After the switch is operated, the switch can be reset by pressing the reset rod 7. The working principle of the liquid expansion type temperature limiter is as follows: the liquid working medium sealed in the temperature sensing bulb expands when heated and is transmitted to the diaphragm capsule through the capillary tube to enable the diaphragm capsule to generate displacement and push the micro switch to be switched off. Typically, the bulb is in a temperature field that requires temperature control, while most capillaries and capsules are at ambient temperature. Although the two diaphragms of the diaphragm box are initially attached, and the aperture of the capillary tube is small, so that most of liquid working media are in the temperature sensing bulb, and the action of the temperature limiter is only related to the temperature change of the temperature control temperature field, but the diaphragm box and the capillary tube still have a small amount of liquid working media which are heated and expanded, and the volume increment generated by the expansion causes the diaphragm box to generate small up-and-down displacement, so that the action temperature is slightly changed, and the action temperature accuracy is influenced, which is a disadvantage of the liquid expansion type temperature limiter.
Chinese patent discloses a chinese patent publication No. CN205752018U entitled "a high temperature controller with ambient temperature compensation", in which a capsule 12, a capsule handle 11, a capillary 9, and a temperature sensing bulb 10 form a liquid expansion type temperature sensing assembly, when the temperature sensing temperature rises, an upper contact plate 4 is pushed by a push plate 8 and a push rod 7 to break a contact, and meanwhile, since the upper contact plate 4 is made of a bimetal material, the bimetal material may generate a certain bending deformation when the ambient temperature changes, thereby compensating the influence of the ambient temperature change. However, the temperature controller has the following disadvantages:
(1) the switch is switched on and off only by the slow bending deformation of the upper contact plate 4, an energy storage snap-action mechanism is not arranged, and the switch is a slow-action switch, so that the overcurrent capacity is weak, the service life is short, and serious electromagnetic interference can be generated during switching on and switching off.
(2) The upper contact plate 4 forms a contact bridge of the switch, and the upper contact plate 4 made of bimetallic strips heats up due to current flowing through the upper contact plate, so that the accurate sensing of the environmental temperature is influenced.
(3) The left end of an upper contact plate 4 of the bimetallic strip is fixed on the base body, the right end of the upper contact plate is propped against a push rod 7, the upper contact plate is of a beam structure with one end simply supporting the other end of a cantilever, the stress is complex, when the upper contact plate is bent and deformed due to the change of the environmental temperature, the deformation is related to the change of the stress, and therefore the deformation is inaccurate, the influence of the environmental temperature is difficult to accurately compensate, namely the action temperature of the upper contact plate can have great change when the environmental temperature changes.
Disclosure of Invention
The invention aims to provide a liquid expansion type temperature limiter with environment temperature compensation, which has very accurate environment temperature compensation, ensures that the action temperature of the liquid expansion type temperature limiter is basically not influenced by the change of the environment temperature, and has the switching performance of large current overcurrent capacity and small electromagnetic interference.
The technical solution proposed by the present invention is as follows:
a liquid expansion type temperature limiter with environmental temperature compensation comprises a switch box assembly, a partition plate, a push rod, a reset rod, a main body, a temperature adjusting screw, a diaphragm box, a capillary tube and a temperature sensing bulb, wherein the diaphragm box, the capillary tube and the temperature sensing bulb form a temperature sensing assembly, liquid working media are filled and sealed in the temperature sensing assembly, a bimetallic disc and a tray which are in contact connection with each other are arranged between the vertex of the diaphragm box and the push rod, the upper layer of the bimetallic disc is a passive layer with a small thermal expansion coefficient, the lower layer of the bimetallic disc is an active layer with a large thermal expansion coefficient, the outer edge of the circumference of the bimetallic disc is in clearance fit connection with the inner wall of the vertical edge of the diaphragm box, the tray is a circular rigid piece made of metal materials and is positioned below the bimetallic disc, the circumferential edge of the tray is in contact connection with the outer edge of the circumference of, the central part of the tray is in contact connection with the upper end part of the push rod.
The bimetal disc is planar, and the center part of the bimetal disc is in contact connection with the top surface of the diaphragm capsule; the tray is in a shape of inverted cone, and the central convex platform is in contact connection with the upper end face of the push rod. The diameter of the circumferential outer edge of the bimetal disc is slightly larger than that of the circumferential edge of the tray, and the circumferential edge of the tray is in planar contact connection with the bimetal disc.
Compared with the prior art, the invention has the following remarkable effects:
(1) the invention adds a component composed of a bimetallic disc and a round tray between the peak of the diaphragm capsule and the push rod on the basis of a universal liquid expansion type temperature limiter, and compensates the micro displacement of the peak of the diaphragm capsule of the liquid expansion type temperature limiter with different types and specifications due to the change of the environmental temperature by selecting the bimetallic disc with proper material and proper thickness, thereby realizing that the action temperature of the liquid expansion type temperature limiter basically does not change along with the change of the environmental temperature and greatly improving the accuracy of the action temperature.
(2) The invention realizes the environmental temperature compensation by only adding 2 parts on the basis of the universal liquid expansion type temperature limiter. The structure is simple, the overall dimension of the product is not changed, the switch is still a snap switch, the high-power electric appliance can be controlled, and no serious electromagnetic interference exists.
(3) The bimetallic wafer of the invention has no current flowing, thus the temperature compensation effect is not influenced by the flowing current, and the stress of the bimetallic wafer is not changed due to the restriction, thus the temperature compensation is accurate.
Drawings
FIG. 1 is a schematic diagram of a liquid expansion temperature limiter with ambient temperature compensation according to the present invention.
The reference numbers in the figures denote: 1. the temperature control device comprises a switch box assembly, 2 parts of a partition plate, 3 parts of a push rod, 4 parts of a reset rod, 5 parts of a main body, 6 parts of a temperature control screw, 7 parts of a diaphragm box, 7-1 parts of a diaphragm box handle, 7-2 parts of a diaphragm box top point, 7-3 parts of a diaphragm vertical edge, 8 parts of a bimetal disc, 8-1 parts of a circumference outer edge, 9 parts of a tray, 9-1 parts of a center convex platform, 9-2 parts of a circumference edge, 10 parts of a capillary tube and 11 parts of a temperature sensing bulb.
Detailed Description
Referring to fig. 1, a liquid expansion type temperature limiter with environmental temperature compensation comprises a switch box assembly 1, a partition plate 2, a push rod 3, a reset rod 4, a main body 5, a temperature adjusting screw 6, a diaphragm box 7, a capillary tube 10 and a temperature sensing bulb 11, wherein the diaphragm box 7, the capillary tube 10 and the temperature sensing bulb 11 form a temperature sensing assembly, liquid working media are filled and sealed in the temperature sensing assembly, a bimetallic disc 8 and a tray 9 which are in contact connection with each other are arranged between the top 7-2 of the diaphragm box 7 and the push rod 3, the upper layer of the bimetallic disc 8 is a passive layer with a small thermal expansion coefficient, the lower layer of the bimetallic disc 8 is an active layer with a large thermal expansion coefficient, the outer edge 8-1 of the circumference of the bimetallic disc 8 is in clearance fit connection with the inner wall of the vertical edge 7-3 of the diaphragm box 7, the tray 9 is a circular rigid piece made of a, the circumferential edge 9-2 of the tray 9 is in contact connection with the circumferential outer edge of the bimetal disc 8, the central part of the bimetal disc 8 is in contact connection with the peak 7-2 of the capsule, and the central part of the tray 9 is in contact connection with the upper end part of the push rod 3.
The bimetal disc 8 is planar, and the center part of the bimetal disc is in surface contact connection with the vertex 7-2 of the diaphragm capsule; the tray 9 is in a shape of an inverted cone, and a central convex platform 9-1 is in surface contact connection with the upper end part of the push rod 3. The diameter of the circumferential outer edge 8-1 of the bimetal disc 8 is slightly larger than that of the circumferential edge 9-2 of the tray 9, and the circumferential edge 9-2 of the tray 9 is in plane contact connection with the bimetal disc 8.
The working principle and the working process of the liquid expansion type temperature limiter with the temperature compensation are as follows:
the working principle of the invention is as follows: when the ambient temperature rises, the bellows 7 and a small amount of liquid working medium in most of the capillary tubes 10 which are at the ambient temperature expand by heating, so that the vertex 7-2 of the bellows 7 generates slight downward displacement relative to the handle 7-1, but at the same time, the central part of the bimetal disc 8 bends slightly downward due to heating, so that the distance from the vertex 7-2 of the bellows to the top of the push rod 3 is slightly reduced, and the downward slight displacement of the bellows 7 due to the thermal expansion is counteracted. On the contrary, when the ambient temperature is reduced, the bellows 7 and a small amount of liquid working medium in most of the capillary tubes 10 at the ambient temperature are cooled and contracted, so that the vertex 7-2 of the bellows 7 generates a slight upward displacement relative to the handle 7-1, but at the same time, the central part of the bimetal disc 8 is slightly bent upwards due to the cold contraction, so that the distance from the vertex 7-2 of the bellows to the top of the push rod 3 is slightly increased, and the upward slight contraction displacement of the bellows 7 is counteracted. By selecting proper material specification and material thickness of the bimetal wafer 8, the equidirectional displacement of the bimetal wafer 8 generated by the change of the environmental temperature is equal to the equidirectional micro displacement of the diaphragm capsule generated by the change of the environmental temperature, and the action temperature of the liquid expansion type temperature limiter can be kept stable and unchanged no matter the environmental temperature is increased or decreased.
The working process of the invention is as follows: when the ambient temperature is not changed (for example, when the standard ambient temperature is 25 ℃), the bimetal disc 8 is a plane, the vertical height of the assembly formed by the bimetal disc 8 and the tray 9 is a nominal height, the diaphragm capsule 7 is not changed due to the expansion of a small amount of liquid working medium in the diaphragm capsule 7 and the capillary tube 10, when the temperature of the temperature sensing bulb 11 is increased, the liquid working medium expands to generate volume increment, the volume increment flows into the diaphragm capsule 7 to enable the vertex 7-2 of the diaphragm capsule to displace downwards, and the push rod 3 is pushed by the assembly formed by the bimetal disc 8 and the tray 9 to further push the switch box assembly 1 to act, so that the universal liquid expansion type temperature limiter works like a. Adjusting the temperature adjustment screw 6 changes the initial position of the capsule shank 7-1 to achieve different operating temperatures.
When the environmental temperature rises or falls, the top 7-2 of the diaphragm box is extended downwards or shortened upwards a little because of the expansion or contraction of a small amount of liquid working medium in the diaphragm box 7 and the capillary 10, and meanwhile, the center part of the bimetal disc 8 is arched downwards a little or upwards a little because of the deformation of the thermal bimetal, so that the downward extension amount or the upward shortening amount of the top 7-2 of the diaphragm box is compensated, and when the temperature of the temperature sensing bulb 11 rises, the liquid working medium expands, so that the top 7-2 of the diaphragm box can still push the push rod 3 to push the switch box assembly 1 to act through the combined body formed by the bimetal disc 8 and the tray 9.
In the applicable temperature range of the bimetal disc material, the specific bending coefficient of the bimetal disc material is basically constant, and the upward or downward arched displacement of the central part of the bimetal disc with a certain diameter and thickness is in direct proportion to the variation of the environmental temperature; the displacement of the temperature sensing component of the liquid expansion type temperature limiter along with the change of the environmental temperature is also linear and is only determined by the volume expansion coefficient of the liquid working medium. By selecting proper material specification and material thickness of the bimetal wafer 8, the displacement change rate of the bimetal wafer 8 caused by the change of the environmental temperature is equal to the tiny displacement change rate of the diaphragm capsule caused by the change of the environmental temperature, and the action temperature of the liquid expansion type temperature limiter keeps stable and unchanged no matter the environmental temperature is increased or decreased. In this example, the bimetal disc 8 with a thickness of 0.40mm, a diameter of phi 18.6mm and a trade mark of 5J1480 is adopted, the arch height change generated along with the temperature change is 0.025mm/10 ℃, and the displacement of the temperature sensing component generated along with the environmental temperature change is just compensated, and is also 0.025mm/10 ℃. Therefore, the action temperature of the liquid expansion type temperature limiter is kept unchanged at 180 ℃ under the condition that the environmental temperature is 25 ℃ or 35 ℃, and the change value of the action temperature of the liquid expansion type temperature limiter is smaller than 1 ℃ under the different environmental temperatures. Whereas without temperature compensation of the bimetallic disc and tray assembly, the operating temperature at 35 c ambient temperature would be reduced to about 175 c with a universal liquid expansion temperature limiter.
The invention is not only suitable for the liquid expansion type temperature limiter, but also suitable for the liquid expansion type temperature controller with the adjusting shaft.
Claims (3)
1. The utility model provides a liquid inflation formula temperature limiter with ambient temperature compensation, includes switch box subassembly (1), baffle (2), push rod (3), release link (4), main part (5), adjust temperature screw (6), capsule (7), capillary (10), temperature sensing package (11) constitute the temperature sensing subassembly, and this temperature sensing subassembly is inside to be filled into and sealed has liquid working medium, its characterized in that: a bimetallic disk (8) and a tray (9) which are mutually contacted and connected are arranged between the top point (7-2) of the capsule (7) and the push rod (3), the upper layer of the bimetal wafer (8) is a passive layer with small thermal expansion coefficient, the lower layer is an active layer with large thermal expansion coefficient, the circumferential outer edge (8-1) of the bimetal disc (8) is in clearance fit connection with the inner wall of the diaphragm vertical edge (7-3) of the diaphragm (7), the tray (9) is a circular rigid piece made of metal materials and is positioned below the bimetal disc (8), the circumferential edge (9-2) of the tray (9) is in contact connection with the circumferential outer edge of the bimetal disc (8), the center of the bimetal disc (8) is in contact connection with the peak (7-2) of the diaphragm capsule, the central part of the tray (9) is in contact connection with the upper end part of the push rod (3).
2. The ambient temperature compensated liquid expansion temperature limiter of claim 1, wherein: the bimetal disc (8) is planar, and the center part of the bimetal disc is in surface contact connection with the peak (7-2) of the diaphragm capsule; the tray (9) is in a shape of an inverted cone, and the central convex platform (9-1) is in contact connection with the upper end surface of the push rod (3).
3. The ambient temperature compensated liquid expansion temperature limiter of claim 1, wherein: the diameter of the circumferential outer edge (8-1) of the bimetal disc (8) is slightly larger than that of the circumferential edge (9-2) of the tray (9), and the circumferential edge (9-2) of the tray (9) is in plane contact connection with the bimetal disc (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110134962.6A CN112786354A (en) | 2021-02-01 | 2021-02-01 | Liquid expansion type temperature limiter with environment temperature compensation function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110134962.6A CN112786354A (en) | 2021-02-01 | 2021-02-01 | Liquid expansion type temperature limiter with environment temperature compensation function |
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| CN112786354A true CN112786354A (en) | 2021-05-11 |
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| CN202110134962.6A Pending CN112786354A (en) | 2021-02-01 | 2021-02-01 | Liquid expansion type temperature limiter with environment temperature compensation function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113921332A (en) * | 2021-10-11 | 2022-01-11 | 麦柯泰姆电子技术(上海)有限公司 | Temperature switch and assembling method thereof |
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2021
- 2021-02-01 CN CN202110134962.6A patent/CN112786354A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113921332A (en) * | 2021-10-11 | 2022-01-11 | 麦柯泰姆电子技术(上海)有限公司 | Temperature switch and assembling method thereof |
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