CN202260391U - Overtemperature protection circuit for heating thermostatic equipment - Google Patents
Overtemperature protection circuit for heating thermostatic equipment Download PDFInfo
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- CN202260391U CN202260391U CN2011203679872U CN201120367987U CN202260391U CN 202260391 U CN202260391 U CN 202260391U CN 2011203679872 U CN2011203679872 U CN 2011203679872U CN 201120367987 U CN201120367987 U CN 201120367987U CN 202260391 U CN202260391 U CN 202260391U
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Abstract
The utility model discloses an overtemperature protection circuit for heating thermostatic equipment, which belongs to the field of protection circuits. The overtemperature protection circuit comprises a branch circuit (1), a branch circuit (2) and a main loop, wherein the branch circuit (1) and the branch circuit (2) are connected with a 220V AC power supply after being connected in parallel; the branch circuit (1) consists of a hand-operated switch KG, an AC contactor coil and a normally closed contact ZJ1 of an intermediate relay, which are sequentially connected in series; the branch circuit (2) is formed in the way that two alarm contact points of a temperature control instrument are connected in series with an intermediate relay coil after being connected in parallel with a normally open contact ZJ2 of the intermediate relay; and the main loop comprises two normally open contacts JL1 and JL2 of an AC contactor, a heating element, the temperature control instrument and a solid-state relay. By adopting the protection circuit provided by the utility model, when the temperature exceeds the pre-control temperature, the main loop is cut off, so that the security of both samples and equipment in a box are effectively protected.
Description
Technical field
The utility model relates to the protective circuit field, more particularly, relates to a kind of overtemperature prote circuit that is applied to thermostatic device for heating such as hot air aging case, baking oven.
Background technology
Elastomeric material is easy to receive Influence of Temperature and wears out in use, storage and transportation, to such an extent as to the use value of losing.For heat resistance and the development of new heat proof material of studying rubber, heat ageing has become one of important experimental study means.
In the mechanical electric apparatus field, power supply box, the Main Control Tank of batch process often arranged.Yet these power supply boxs, Main Control Tank etc. generally all need wear out, and there be hidden danger and disappearance in various degree in traditional ageing oven at aspects such as ageing environment and dynamics, safety standards, and especially this kind equipment does not adopt the overtemperature prote circuit again.
Baking oven is a kind of equipment of in food processing, often using, and at present, common baking oven all has complex structure, characteristics such as manufacturing cost height, but this kind equipment does not adopt the overtemperature prote circuit equally.
In the prior art, thermostatic equipments such as ageing oven, baking oven do not adopt the preceding drawback of overtemperature prote circuit:
1. thermostatic equipment such as ageing oven, baking oven circuit or parts break down, and behind the temperature control, the consequence that causes: gently then rubbery sample or goods are roasting bad by high temperature, heavy then breaking out of fire.
Though 2. there is overtemperature prote in part ageing oven manufacturer, the temperature of outage is located at 300 ℃ of highest points, can not regulate, and be unsafe to rubber industry.
3. ageing oven is the long-term equipment of running continuously, does not need artificial value night shift guard before not transforming, and increases manpower burden and cost of labor.
One Chinese patent application numbers 201110008954.3, the patent document of the applying date: 2011-01-11 discloses a kind of baking oven, aims to provide a kind of baking oven simple in structure, with low cost.Its structure mainly comprises the interior drying unit that is located at heating chamber, and drying unit is made up of boiler and radiating tube, in the heating chamber fan is installed also simultaneously; Improved drying effect; During oven dry, the article of needs oven dry are put into drying chamber get final product, hot blast can get into drying chamber from ventilating opening.The present invention is simple in structure, with low cost, is adapted at medium and small food processing enterprises and promotes.
One Chinese patent application number: 200820093065.5; The patent document of the applying date: 2008-04-01 discloses a kind of ageing oven; Said ageing oven comprises power unit, temperature control part, thermal cycle part, power supply output and loading interfaces part; Power unit is arranged the air switch 1-6 that is connected in parallel, temperature control part and thermal cycle part by total air switch through switching, and air switch 1-6 output partly is connected as the power supply output and with loading interfaces.This utility model can be optimized aging structure through adopting said structure, improves aging effect.
More than the weak point of 2 parts of disclosed prior aries of patent document be that two kinds of equipment all do not adopt the overtemperature prote circuit, fail safe is not high.
The utility model content
The technical problem that solves
Thereby cause the not high problem of security performance to thermostatic equipment unprotected circuits such as ageing oven of the prior art, baking ovens, but the utility model provide a kind of under high-temperature condition automatic shutdown circuit and the thermostatic device for heating overtemperature prote circuit that can after energising, connect automatically.
Technical scheme
The purpose of the utility model realizes through following technical scheme:
The overtemperature prote circuit of a kind of thermostatic device for heating of the utility model comprises branch road 1, branch road 2, major loop; Connect the 220V AC power after described branch road 1, branch road 2 parallel connections; Said branch road 1 is made up of the normally-closed contact ZJ1 series connection of hand switch KG, ac contactor coil, auxiliary relay successively; Said branch road 2 by two warning contacts of temperature control table with after the normally opened contact ZJ2 of described auxiliary relay is parallelly connected, the formation of connecting with the auxiliary relay coil; Said major loop comprises 2 normally opened contact JL1 of A.C. contactor and JL2, heating element, temperature control table and solid-state relay; 2 outputs of said solid-state relay are connected with heating element; 2 control ends of said solid-state relay receive the output from the temperature control table, and said temperature control table is through 2 temperature signals that are provided with the lead-in wire detection heating element of temperature sensor; Said major loop is through two warning output point access leg 2 of temperature control table.
Said temperature sensor is the pt100 temperature sensor.
The electrical signal transfer process of the protective circuit of the utility model is following:
Close switch KG, then ac contactor coil energising on the branch road 1, the contact JL1 of A.C. contactor and JL2 are closed, the solid-state relay conducting, heating element begins heating, and equipment normally heats up; When the temperature of heating element reached temperature control table control value in advance, the temperature control table had output to solid-state relay, and the control solid-state relay ends, and heating element stops heating; When temperature was controlled in advance above the temperature control table and reached the overtemperature prote temperature value, two alarm actuating contacts of temperature control table were connected, and then the branch road 2 of control circuit is connected.At this moment, the conducting of auxiliary relay coil, the normally opened contact ZL2 adhesive of auxiliary relay; Auxiliary relay normally-closed contact ZL1 breaks off, and then branch road 1 breaks off, thereby ac contactor coil breaks off; Then the contact JL1 of A.C. contactor, JL2 break off, and have cut off the major loop heater circuit.
Beneficial effect
The utility model it is advantageous that than prior art:
(1) protective circuit of use the utility model is when temperature surpasses preparatory controlling temperature, such as being higher than 20 ℃ of test temperatures, major loop cut-out, effectively sample and device security in the guard box;
(2) protective circuit of use the utility model, the user finds temperature decline report at once, the maintenance personal in time arrives on-the-spot, in time the remover apparatus fault;
(3) protective circuit of use the utility model, after the major loop outage, even temperature descends, before manual work was fixed a breakdown, major loop was connected never;
(4) protective circuit of use the utility model, incoming call after having a power failure, ageing oven, baking oven, heating oil groove, water-bath etc. are all automatic to be connected, and it is on duty to need not manual work, need not to manually start;
(5) protective circuit of use the utility model can be cancelled artificial value night shift guard, alleviates the manpower burden.
Description of drawings
Fig. 1 is the control circuit of the utility model;
Fig. 2 is the major loop of the utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described further.
Like Fig. 1, the overtemperature prote circuit of a kind of thermostatic device for heating of the utility model, it comprises branch road 1, branch road 2, major loop; Connect the 220V AC power after described branch road 1, branch road 2 parallel connections; Said branch road 1 is made up of the normally-closed contact ZJ1 series connection of hand switch KG, ac contactor coil, auxiliary relay successively; Said branch road 2 by two warning contacts of temperature control table with after the normally opened contact ZJ2 of described auxiliary relay is parallelly connected, the formation of connecting with the auxiliary relay coil.
Like Fig. 2; Said major loop comprises 2 normally opened contact JL1 of A.C. contactor and JL2, heating element, temperature control table and solid-state relay; 2 outputs of said solid-state relay are connected with heating element; 2 control ends of said solid-state relay receive the output from the temperature control table, and said temperature control table is through 2 temperature signals that are provided with the lead-in wire detection heating element of temperature sensor;
Said major loop is through two warning output point access leg 2 of temperature control table.
K switch G on the manual closing control circuit, then A.C. contactor adhesive on the branch road 1, the contact JL1 of A.C. contactor and JL2 are closed, the solid-state relay conducting, heating element begins heating, and equipment normally heats up.
When the temperature of heating element reached temperature control table control value in advance, the temperature control table had output to solid-state relay, and the control solid-state relay ends, and heating element stops heating.
When accident takes place, ambient temperature surpasses that the temperature control table is controlled in advance and when reaching the overtemperature prote temperature value, two alarm actuating contacts of temperature control table are connected, and then the branch road 2 of control circuit is connected.At this moment, the conducting of auxiliary relay coil, the normally opened contact ZL2 adhesive of auxiliary relay; Auxiliary relay normally-closed contact ZL1 breaks off, and then branch road 1 breaks off, thereby ac contactor coil breaks off; Then the contact JL1 of A.C. contactor, JL2 break off, and have cut off the major loop heater circuit.
Because auxiliary relay is in self-locking state,, major loop is connected even the circuit break-off signal descends.After treating that general supply is closed in manual work, reclose power supply again, can search reason, fix a breakdown.
Below schematically the utility model and execution mode thereof are described, this description does not have restricted, and shown in the accompanying drawing also is one of execution mode of the present invention, and practical structure is not limited thereto.So,, under the situation that does not break away from the invention aim,, all should belong to the protection range of the utility model without creationary frame mode similar and the embodiment of designing with this technical scheme if those of ordinary skill in the art is enlightened by it.
Claims (2)
1. the overtemperature prote circuit of a thermostatic device for heating is characterized in that, it comprises branch road 1, branch road 2, major loop; Connect the 220V AC power after described branch road 1, branch road 2 parallel connections;
Said branch road 1 is made up of the normally-closed contact ZJ1 series connection of hand switch KG, ac contactor coil, auxiliary relay successively;
Said branch road 2 by two warning contacts of temperature control table with after the normally opened contact ZJ2 of described auxiliary relay is parallelly connected, the formation of connecting with the auxiliary relay coil;
Said major loop comprises 2 normally opened contact JL1 and JL2, heating element, temperature control table and the solid-state relay of A.C. contactor; 2 outputs of said solid-state relay are connected with heating element; 2 control ends of said solid-state relay receive the output from the temperature control table, and said temperature control table is through 2 temperature signals that are provided with the lead-in wire detection heating element of temperature sensor;
Said major loop is through two warning output point access leg 2 of temperature control table.
2. the overtemperature prote circuit of thermostatic device for heating according to claim 1 is characterized in that, said temperature sensor is the pt100 temperature sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203679872U CN202260391U (en) | 2011-09-30 | 2011-09-30 | Overtemperature protection circuit for heating thermostatic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203679872U CN202260391U (en) | 2011-09-30 | 2011-09-30 | Overtemperature protection circuit for heating thermostatic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202260391U true CN202260391U (en) | 2012-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203679872U Expired - Fee Related CN202260391U (en) | 2011-09-30 | 2011-09-30 | Overtemperature protection circuit for heating thermostatic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202260391U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103116105A (en) * | 2013-02-27 | 2013-05-22 | 苏州热工研究院有限公司 | Fuse protector life test system with overheating protection and warning function |
| CN103487761A (en) * | 2013-09-27 | 2014-01-01 | 国家电网公司 | Temperature control testing device for lithium ion battery |
| CN104378091A (en) * | 2014-11-07 | 2015-02-25 | 芜湖新兴铸管有限责任公司 | Solid-state relay monitoring circuit |
| CN104882852A (en) * | 2015-06-26 | 2015-09-02 | 太仓市同维电子有限公司 | High-temperature automatic power-off method of household gateway |
| CN108260283A (en) * | 2018-01-17 | 2018-07-06 | 深圳市宝盛自动化设备有限公司 | The constant temperature microscope carrier of FPC bonding machines |
| CN114498555A (en) * | 2022-02-11 | 2022-05-13 | 北大方正集团有限公司 | Prevent dry combustion method protection circuit |
-
2011
- 2011-09-30 CN CN2011203679872U patent/CN202260391U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103116105A (en) * | 2013-02-27 | 2013-05-22 | 苏州热工研究院有限公司 | Fuse protector life test system with overheating protection and warning function |
| CN103487761A (en) * | 2013-09-27 | 2014-01-01 | 国家电网公司 | Temperature control testing device for lithium ion battery |
| CN104378091A (en) * | 2014-11-07 | 2015-02-25 | 芜湖新兴铸管有限责任公司 | Solid-state relay monitoring circuit |
| CN104882852A (en) * | 2015-06-26 | 2015-09-02 | 太仓市同维电子有限公司 | High-temperature automatic power-off method of household gateway |
| CN108260283A (en) * | 2018-01-17 | 2018-07-06 | 深圳市宝盛自动化设备有限公司 | The constant temperature microscope carrier of FPC bonding machines |
| CN108260283B (en) * | 2018-01-17 | 2020-12-22 | 深圳市宝盛自动化设备有限公司 | Constant temperature carrying platform of FPC welding machine |
| CN114498555A (en) * | 2022-02-11 | 2022-05-13 | 北大方正集团有限公司 | Prevent dry combustion method protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120530 Termination date: 20200930 |
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| CF01 | Termination of patent right due to non-payment of annual fee |