CN114498555A - Prevent dry combustion method protection circuit - Google Patents
Prevent dry combustion method protection circuit Download PDFInfo
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- CN114498555A CN114498555A CN202210129573.9A CN202210129573A CN114498555A CN 114498555 A CN114498555 A CN 114498555A CN 202210129573 A CN202210129573 A CN 202210129573A CN 114498555 A CN114498555 A CN 114498555A
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- 238000009841 combustion method Methods 0.000 title abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 309
- 230000002265 prevention Effects 0.000 claims description 10
- 238000001035 drying Methods 0.000 description 23
- 238000010586 diagram Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 5
- 230000004044 response Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
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Abstract
The application provides a prevent dry combustion method protection circuit, the circuit includes heating circuit, first control circuit, second control circuit and third control circuit, heating circuit is including the heating element that is used for the heating, first control circuit is used for acquireing the heating temperature of heating element, and control the second control circuit and switch on when heating temperature satisfies the protection condition of preventing dry combustion method of presetting, second control circuit is used for controlling the unit that opens circuit and is in the conducting state, third control circuit is including the unit that opens circuit, the unit that should open circuit is used for the heating state of interruption heating element when being in the conducting state, still be used for keeping the conducting state of the unit that opens circuit, with the validity of the unit that opens circuit to the operation that opens circuit of guarantee heating circuit, make the heating element break away from the heating state, the safety of heating circuit and surrounding environment has been ensured, the security of heating circuit has been improved.
Description
Technical Field
The application relates to the technical field of circuits, in particular to an anti-dry heating protection circuit.
Background
The horizontal line drying section is important equipment for drying the board surface in a PCB production line, and in the drying process, the horizontal line drying section needs to keep the drying temperature within a preset temperature range so as to ensure the working efficiency or the working safety of the horizontal line drying section.
Fig. 1 is a schematic structural diagram of a heating circuit of a horizontal line drying section, as shown in fig. 1, the heating circuit of the horizontal line drying section includes an ac power supply 101, a circuit breaker 102, a heating contact 103, a heating unit 104, a control unit 105, and a temperature sensor 106, where the ac power supply 101, the circuit breaker 102, the heating contact 103 and the heating unit 104 are connected to form a heating loop, the control unit 105 is connected to the heating contact 103, the control unit 105 controls the heating contact 103 to be turned on according to an obtained heating instruction to turn on the heating loop, and the heating unit 104 obtains electric energy of the ac power supply 101 to perform a corresponding heating operation. A temperature sensor 106 is disposed beside the heating unit 104 for acquiring the temperature of the heating unit 104, and a control unit 105 is connected to the temperature sensor 106 for acquiring the temperature data acquired by the temperature sensor 106. When the temperature data exceeds the preset temperature threshold, the control unit 105 controls the heating contact 103 to be turned off to interrupt the heating circuit, and stops the heating operation of the heating unit 104, thereby preventing the heating temperature exceeding the preset temperature threshold from damaging the horizontal line drying section and the PCB. However, the heating contact 103 in the over-temperature environment is easily melted, and the melted heating contact 103 cannot be turned off, so that the heating circuit is always kept in a conducting state, and the temperature generated by the horizontal line drying section continuously rises, thereby causing potential safety hazards.
Therefore, how to improve the safety of the heating circuit is an urgent problem to be solved.
Disclosure of Invention
The application provides a prevent dry combustion method protection circuit for solve the technical problem who improves heating circuit's security.
The application provides a dry burning prevention protection circuit, which comprises a heating loop, a first control loop, a second control loop and a third control loop;
the heating loop comprises a heating unit, and the heating unit is used for heating; the third control loop comprises a circuit breaking unit which is used for interrupting the heating state of the heating unit when the circuit breaking unit is in a conducting state; the third control loop is used for keeping the on state of the breaking unit and enabling the heating unit to be in an unheated state;
the first control loop is used for acquiring the heating temperature of the heating unit, and controlling the second control loop to be conducted when the heating temperature meets the preset dry burning prevention protection condition; the second control loop is used for controlling the circuit breaking unit to be in a conducting state.
In the technical scheme, the dry burning prevention protection circuit controls the conduction state of the first control loop according to the heating state of the heating unit, so that the second control loop is controlled to control the disconnection unit to be in the conduction state, after the second control loop is conducted, the third control loop keeps the conduction operation of the disconnection unit, and the disconnection unit executes forced disconnection operation on the heating loop, so that the heating temperature of the heating unit is cooled by forced disconnection after being over-heated, the safety of the heating loop and the surrounding environment is guaranteed, and the safety of the heating circuit is improved.
Optionally, the heating circuit further includes a heating control unit, the heating control unit is configured to control a heating state of the heating unit, and the heating control unit and the heating unit are connected to form the heating circuit.
Optionally, the heating control unit includes a heating contact and a circuit breaker, a first end of the circuit breaker is connected to the ac power supply, a second end of the circuit breaker is connected to the first end of the heating contact, a second end of the heating contact is connected to the first end of the heating unit, and a second end of the heating unit is grounded.
Optionally, the first control loop includes a mechanical temperature control unit and an intermediate relay coil, and the mechanical temperature control unit is connected to the intermediate relay coil;
the mechanical temperature control unit is used for obtaining the heating temperature of the heating unit and changing the conduction state of the mechanical temperature control unit according to the heating state of the heating unit.
Optionally, the mechanical temperature control unit includes a mechanical temperature control switch, a first end of the intermediate relay coil is connected to the positive electrode of the first dc power supply, a second end of the intermediate relay coil is connected to the first end of the mechanical temperature control switch, and a second end of the mechanical temperature control switch is connected to the negative electrode of the first dc power supply.
Optionally, the circuit further comprises a control unit;
the control unit is connected with the heating contact and used for controlling the heating contact to be in a conducting state;
the control unit is further connected with the mechanical temperature control switch, the control unit is used for generating a heating contact control instruction when the mechanical temperature control switch is in a conducting state, and the heating contact control instruction is used for controlling the first control module to enable the heating contact to be in the conducting state.
Optionally, the second control circuit includes a second control unit, and the heating control unit and the second control unit in the heating circuit are connected to form the second control circuit.
Optionally, the second control unit includes an intermediate relay contact and a trip coil, a first end of the intermediate relay contact is connected to the second end of the heating contact, a second end of the intermediate relay contact is connected to the first end of the trip coil, and a second end of the trip coil is grounded.
Optionally, when the heating temperature satisfies a preset dry-heating protection condition, controlling the second control loop to be conducted, specifically including:
when the heating temperature is higher than a preset temperature threshold value of the mechanical temperature control unit, controlling the conduction of the mechanical temperature control unit and the conduction of the first control loop;
the intermediate relay contacts in the second control loop are controlled to close according to the conductive state of the intermediate relay coil in the first control loop.
Optionally, the third control loop includes a trip unit trip control unit, and the trip coil is connected to the trip unit trip control unit to form the third control loop.
Optionally, the trip unit comprises a trip contact, and the trip contact is used for controlling the trip unit to execute a trip operation;
the first end of the tripper contact is connected with the anode of the second direct-current power supply, the second end of the tripper contact is connected with the first end of the tripper coil, and the second end of the tripper coil is connected with the cathode of the second direct-current power supply.
The application provides a prevent dry combustion method protection circuit, the circuit includes heating circuit, first control circuit, second control circuit and third control circuit, heating circuit is including the heating element that is used for the heating, first control circuit is used for acquireing the heating temperature of heating element, and control the second control circuit and switch on when heating temperature satisfies the protection condition of preventing dry combustion method of presetting, second control circuit is used for controlling the unit that opens circuit and is in the conducting state, third control circuit is including the unit that opens circuit, the unit that should open circuit is used for the heating state of interruption heating element when being in the conducting state, still be used for keeping the conducting state of the unit that opens circuit, with the validity of the unit that opens circuit to the operation that opens circuit of guarantee heating circuit, make the heating element break away from the heating state, the safety of heating circuit and surrounding environment has been ensured, the security of heating circuit has been improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
FIG. 1 is a schematic structural diagram of a heating circuit of a horizontal line drying section;
fig. 2 is a schematic structural diagram of an anti-dry heating protection circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of an anti-dry heating protection circuit according to another embodiment of the present application;
fig. 4 is a schematic structural diagram of an anti-dry heating protection circuit according to another embodiment of the present application.
With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the recitation of an element by the phrase "comprising an … …" does not exclude the presence of additional like elements in the process, method, article, or apparatus that comprises the element, and further, where similarly-named elements, features, or elements in different embodiments of the disclosure may have the same meaning, or may have different meanings, that particular meaning should be determined by their interpretation in the embodiment or further by context with the embodiment.
It should be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope herein. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context. Also, as used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used in this specification, specify the presence of stated features, steps, operations, elements, components, items, species, and/or groups, but do not preclude the presence, or addition of one or more other features, steps, operations, elements, components, items, species, and/or groups thereof. The terms "or," "and/or," "including at least one of the following," and the like, as used herein, are to be construed as inclusive or mean any one or any combination. For example, "includes at least one of: A. b, C "means" any of the following: a; b; c; a and B; a and C; b and C; a and B and C ", again for example," A, B or C "or" A, B and/or C "means" any of the following: a; b; c; a and B; a and C; b and C; a and B and C'. An exception to this definition will occur only when a combination of elements, functions, steps or operations are inherently mutually exclusive in some way.
It should be understood that, although the steps in the flowcharts in the embodiments of the present application are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and may be performed in other orders unless explicitly stated herein. Moreover, at least some of the steps in the figures may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, in different orders, and may be performed alternately or partially with other steps or at least some of the sub-steps or stages of other steps.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The horizontal line drying section is important equipment for drying the board surface in a PCB production line, and in the drying process, the horizontal line drying section needs to keep the drying temperature within a preset temperature range so as to ensure the working efficiency or the working safety of the horizontal line drying section.
Fig. 1 is a schematic structural diagram of a heating circuit of a horizontal line drying section, as shown in fig. 1, the heating circuit of the horizontal line drying section includes an ac power supply 101, a circuit breaker 102, a heating contact 103, a heating unit 104, a control unit 105, and a temperature sensor 106, where the ac power supply 101, the circuit breaker 102, the heating contact 103 and the heating unit 104 are connected to form a heating loop, the control unit 105 is connected to the heating contact 103, the control unit 105 controls the heating contact 103 to be turned on according to an obtained heating instruction to turn on the heating loop, and the heating unit 104 obtains electric energy of the ac power supply 101 to perform a corresponding heating operation. A temperature sensor 106 is disposed beside the heating unit 104 for acquiring the temperature of the heating unit 104, and a control unit 105 is connected to the temperature sensor 106 for acquiring the temperature data acquired by the temperature sensor 106. When the temperature data exceeds the preset temperature threshold, the control unit 105 controls the heating contact 103 to be turned off to interrupt the heating circuit, and stops the heating operation of the heating unit 104, thereby preventing the heating temperature exceeding the preset temperature threshold from damaging the horizontal line drying section and the PCB. However, the heating contact 103 in the over-temperature environment is easily melted, and the melted heating contact 103 cannot be turned off, so that the heating circuit is always kept in a conducting state, and the temperature generated by the horizontal line drying section continuously rises, thereby causing potential safety hazards.
Therefore, how to improve the safety of the heating circuit is an urgent problem to be solved.
To solve the above technical problem, an embodiment of the present application provides an anti-dry heating protection circuit, which aims to solve the problem of improving the safety of a heating circuit. The technical idea of the application is as follows: the heating temperature is obtained through a mechanical temperature control unit arranged beside the heating circuit, and when the heating temperature meets the dry burning prevention protection condition, the break unit is controlled and maintained in a conducting state through an intermediate relay, so that the break unit executes and keeps the break operation of the heating circuit.
Fig. 2 is a schematic structural diagram of an anti-dry heating protection circuit according to an embodiment of the present disclosure, and as shown in fig. 2, the anti-dry heating protection circuit includes a heating circuit 201, a first control circuit 202, a second control circuit 203, and a third control circuit 204, where the heating circuit 201 includes a heating unit 205, and the heating unit 205 is used for heating, and in an embodiment, the heating unit 205 is a heating pipe of a horizontal line drying section. The third control loop 204 comprises a breaking unit 206, the breaking unit 206 being adapted to interrupt the heating state of the heating unit 205 when in the on-state, i.e. by interrupting the heating loop 201, to stop the process of converting the received electrical energy into thermal energy by the heating unit 205.
In the operation process of the dry burning prevention protection circuit, the first control loop 202 continuously obtains the heating temperature of the heating unit 205, and when the heating temperature generated by the heating unit 205 in the heating loop 201 meets the preset dry burning prevention protection condition, the second control loop 203 is controlled to be conducted. After the second control loop is turned on, the breaking unit 206 in the third control loop 204 performs a turn-on operation and is in a turn-on state after the turn-on operation is completed. The third control unit 204 maintains the on state of the breaking unit 206, and controls the breaking unit 206 to perform and maintain the breaking operation on the heating circuit 201 so that the heating unit 205 is in the unheated state.
In the technical scheme, the dry burning prevention protection circuit controls the conduction state of the first control loop according to the heating state of the heating unit, so that the second control loop is controlled to control the disconnection unit to be in the conduction state, after the second control loop is conducted, the third control loop keeps the conduction operation of the disconnection unit, and the disconnection unit executes forced disconnection operation on the heating loop, so that the heating temperature of the heating unit is cooled by forced disconnection after being over-heated, the safety of the heating loop and the surrounding environment is guaranteed, and the safety of the heating circuit is improved.
Fig. 3 is a schematic structural diagram of an anti-dry heating protection circuit according to another embodiment of the present disclosure, as shown in fig. 3, the anti-dry heating protection circuit includes a heating circuit 201, a first control circuit 202, a second control circuit 203, a third control circuit 204, and a control unit 211, where the control unit 211 is connected to the heating circuit 201 and the first control circuit 202, and is configured to control the heating circuit 201 to be turned on and off according to information related to the heating circuit 201 obtained by the first control circuit 202.
The heating circuit 201 comprises a heating unit 205 and a heating control unit 207, and the heating unit 205 and the heating control unit 207 are connected to form a heating circuit, wherein the heating control unit 207 is used for controlling the heating state of the heating unit 205, that is, the heating control unit 207 is in a conducting state, the heating circuit 201 is in a conducting state, the heating control unit 207 is in a disconnecting state, and the heating circuit 201 is in a disconnecting state.
The first control loop 202 includes an intermediate relay coil 208 and a mechanical temperature control unit 209, and the intermediate relay coil 208 and the mechanical temperature control unit 209 are connected to form the first control loop 202. The mechanical temperature control unit 209 is disposed beside the heating unit 205 in the heating circuit 201, and is used for acquiring the heating temperature of the heating unit 205. When the heating temperature satisfies the preset dry-burning prevention protection condition, the mechanical temperature control unit 209 is turned on. In the first aspect, the control unit 211 is connected to the mechanical temperature control unit 209, when the mechanical temperature control unit 209 is turned on, the control unit 211 obtains an over-temperature signal, the control unit 211 controls the heating control unit 207 in the heating circuit 201 to be turned off, so that the heating circuit 201 is turned off, and the heating unit 205 is in an unheated state. In the second aspect, the mechanical temperature control unit 209 is turned on, the first control loop 202 is turned on, and the intermediate relay coil 208 is turned on.
The second control loop 203 comprises a heating control unit 207 and a second control unit 210, and the heating control unit 207 and the second control unit 210 are connected to form the second control loop 203. Wherein the heating control unit 207 in the second control loop 203 is the same as the heating control unit 207 in the heating loop 201. The conduction state of the second control unit 210 is controlled according to the conduction state of the intermediate relay coil 208 in the first control loop 202, i.e. the intermediate relay coil 208 is conducted, the second control unit 210 is conducted, and the second control loop 203 is conducted.
The third control loop 204 includes a trip unit 206, and the trip unit 206 includes a trip unit trip control unit 212. When the second control unit 210 in the second control loop 203 is turned on, the breaking unit 206 in the third control loop 204 is turned on, and the trip breaking control unit 212 is turned on. When the tripper trip control unit 212 is turned on, the tripper trip control unit 212 controls the tripper to operate, and the heating control unit 207 connected to the tripper is forcibly turned off by the tripper, thereby interrupting the heating process of the heating unit 205.
In the above technical solution, according to the heating temperature generated by the heating unit obtained by the mechanical temperature control unit, the control unit controls the heating control unit to be turned off to stop the heating state of the heating unit, if the heating unit does not change state, the first control loop controls the on state of the second control unit in the second control loop through the on state of the intermediate relay coil, after the second control loop is turned on, the open-circuit unit of the third control loop is turned on, the trip open-circuit control unit performs the open-circuit operation on the heating control unit, and meanwhile, the third control loop maintains the on state of the open-circuit unit to ensure the effectiveness of the open-circuit operation, and the safety of the heating circuit is improved through the double open-circuit operation.
Fig. 4 is a schematic structural diagram of an anti-dry heating protection circuit according to another embodiment of the present application, as shown in fig. 4, a heating circuit 305 of the anti-dry heating protection circuit includes a heating control unit 303 and a heating unit 304, where the heating control unit 303 includes a circuit breaker 301 and a heating contact 302, the heating unit 304 includes a heating pipe, and the three-phase ac power supply, the circuit breaker 301, the heating contact 302, the heating unit 304 and a ground wire are connected to form the heating circuit 305, that is, the three-phase ac power supply is connected to a first end of the circuit breaker 301, a second end of the circuit breaker 301 is connected to a first end of the heating contact 302, a second end of the heating contact 302 is connected to a first end of the heating unit 304, and a second end of the heating unit 304 is grounded. The heating contact 302 is connected to the control unit 309, and the control unit 309 controls the on state and the off state of the heating contact 302, in an embodiment, the control unit 309 is a Programmable Logic Controller (PLC).
The first control loop 308 comprises a mechanical temperature control unit and an intermediate relay coil 306, wherein the mechanical temperature control unit comprises a mechanical temperature control switch 307, and the mechanical temperature control switch 307, the intermediate relay coil 306 and a first direct current power supply are connected to form the first control loop 308. The mechanical temperature control switch 307 is a normally open contact, that is, when the temperature of the heating unit 304 is not greater than the preset temperature threshold, the mechanical temperature control switch 307 is in an off state, and when the temperature of the heating unit 307 is greater than the preset temperature threshold, the mechanical temperature control switch 307 is in an on state. More specifically, the positive pole of the first dc power source is connected to a first end of the intermediate relay coil 306, a second end of the intermediate relay coil 306 is connected to a first end of the mechanical temperature controlled switch 307, and a second end of the mechanical temperature controlled switch 307 is connected to the negative pole of the first dc power source. In one embodiment, the positive pole of the first DC power supply is 24V and the negative pole of the first DC power supply is-24V.
The second control loop comprises a heating control unit 303 and a second control unit, the second control unit comprises an intermediate relay contact 310 and a tripper coil 311, and a three-phase alternating current power supply, the heating control unit 303, the intermediate relay contact 310, the tripper coil 311 and a ground wire are connected to form the second control loop. More specifically, the three-phase ac power supply includes three-phase power supplies L1, L2, and L3, the heating control unit 303 includes a circuit breaker 301 and a heating contact 302, the circuit breaker 301 includes 3 sub-circuit breakers, which are a first sub-circuit breaker, a second sub-circuit breaker, and a third sub-circuit breaker, respectively, and the heating contact 302 includes 3 sub-heating contacts, which are a first sub-heating contact, a second sub-heating contact, and a third sub-heating contact, respectively. The first end of each phase of the alternating current power supply is respectively connected with the first end of one of the sub circuit breakers, and the second end of the sub circuit breaker is connected with the first end of one of the sub heating contacts. More specifically, the L1 ac power source is connected to a first sub breaker, which is connected to a first sub heating contact; the L2 alternating current power supply is connected with a second sub circuit breaker, and the second sub circuit breaker is connected with a second sub heating contact; the L3 ac power source is connected to a third sub breaker, which is connected to a third sub heating contact. The second end of any one of the heating contacts may be connected to the first end of the intermediate relay contact 310, i.e. the second end of the first or second or third sub breaker is connected to the first end of the intermediate relay contact 310. The second end of the intermediate relay contact 310 is connected to the first end of the trip coil 311, and the second end of the trip coil 311 is connected to the ground line N, forming a second control loop.
The third control loop 315 includes a second dc power supply, a trip coil 311, and a trip unit circuit-breaking control unit 314, where the trip unit circuit-breaking control unit 314 includes a trip contact 313 and a trip device 312, a first end of the trip contact 313 is connected to a positive pole of the second dc power supply, a second end of the trip contact 313 is connected to a first end of the trip coil 311, and a second end of the trip coil 311 is connected to a negative pole of the second dc power supply, so as to form the third control loop 314. In one embodiment, the positive pole of the second DC power supply is 24V, and the negative pole of the second DC power supply is-24V.
When the horizontal line drying section works, the PLC controls the heating contact 302 to be closed according to the acquired heating instruction, and when the circuit breaker 301 is switched on, the heating loop 305 is switched on, and the heating unit 304 starts heating. When the heating temperature of the heating unit 304 exceeds a preset temperature threshold, the mechanical temperature control switch 307 is closed, and the PLC309 controls the state of the heating contact 302 according to the obtained conduction signal, i.e., changes from the conduction state to the disconnection state. If the heating contacts 302 are open, the heating circuit 305 is open and the heating unit 304 is in an unheated state. If the heating contact 302 is not disconnected due to a hardware fault, the heating control unit 303 is still turned on, and the heating unit 304 is still performing the heating operation. In this case, the mechanical thermostatic switch 307 is on, the first control circuit is on, the intermediate relay coil 306 is on, the intermediate relay contact 310 in the second control circuit is closed, the second control circuit is on, the trip coil 311 is on, the trip contact 313 is closed, and the third control circuit 315 is on, which is on to maintain the closed state of the trip contact 313. When the tripper contact 313 is closed, the tripping device 312 performs a tripping action, the tripping device 312 is connected with the circuit breaker 301, when the tripping device 312 performs the tripping action, the circuit breaker 301 is opened, the heating control unit 303 is opened, the heating unit 304 stops heating, the second control loop is opened, and meanwhile, the third control loop 315 is still kept in a conducting state, so that the tripping operation of the tripping device 312 is kept, and the effectiveness of the circuit breaker opening is guaranteed. In addition, the PLC309 performs an alarm operation according to the closed state of the mechanical temperature control switch 307 to remind a worker to monitor the on state of the heating control unit 303 and the heating state of the heating unit 304.
In the technical scheme, the PLC controls the heating contact to be disconnected according to the heating temperature of the heating unit so as to stop the heating process of the heating unit, if the heating contact is not disconnected, the second control loop is controlled to be connected through the connected intermediate relay coil, after the tripper coil in the second control loop is connected, the connection of the tripper contact is ensured to ensure the connection of the third control loop, so that the tripper can perform the circuit breaking operation on the circuit breaker, the double circuit breaking operation is realized, the potential safety hazard caused by continuous heating of the heating unit is prevented, and the safety of the heating circuit is improved.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (11)
1. The dry burning prevention protection circuit is characterized by comprising a heating loop, a first control loop, a second control loop and a third control loop;
the heating loop comprises a heating unit for heating; the third control loop comprises a breaking unit for interrupting the heating state of the heating unit when in the conducting state; the third control loop is used for keeping the conduction state of the breaking unit and enabling the heating unit to be in an unheated state;
the first control loop is used for acquiring the heating temperature of the heating unit, and when the heating temperature meets the preset dry burning prevention protection condition, the second control loop is controlled to be conducted; the second control loop is used for controlling the circuit breaking unit to be in a conducting state.
2. The circuit of claim 1, wherein the heating circuit further comprises a heating control unit, the heating control unit is configured to control a heating state of the heating unit, and the heating control unit and the heating unit are connected to form the heating circuit.
3. The circuit of claim 2, wherein the heating control unit comprises a heating contact and a circuit breaker, a first end of the circuit breaker is connected to an alternating current power source, a second end of the circuit breaker is connected to the first end of the heating contact, a second end of the heating contact is connected to the first end of the heating unit, and a second end of the heating unit is grounded.
4. The circuit of claim 1, wherein the first control loop comprises a mechanical temperature control unit and an intermediate relay coil, the mechanical temperature control unit and the intermediate relay coil being connected;
the mechanical temperature control unit is used for acquiring the heating temperature of the heating unit and changing the conduction state of the mechanical temperature control unit according to the heating state of the heating unit.
5. The circuit of claim 4, wherein the mechanical temperature control unit comprises a mechanical temperature control switch, a first end of the intermediate relay coil is connected to a positive pole of a first DC power source, a second end of the intermediate relay coil is connected to a first end of the mechanical temperature control switch, and a second end of the mechanical temperature control switch is connected to a negative pole of the first DC power source.
6. The circuit according to any one of claims 1 to 5, wherein the circuit further comprises a control unit;
the control unit is connected with the heating contact and used for controlling the heating contact to be in a conducting state;
the control unit is further connected with a mechanical temperature control switch, the control unit is used for generating a heating contact control instruction when the mechanical temperature control switch is in a conducting state, and the heating contact control instruction is used for controlling the first control module to enable the heating contact to be in a conducting state.
7. The circuit of claim 2 or 3, wherein the second control loop comprises a second control unit, and the heating control unit and the second control unit in the heating loop are connected to form the second control loop.
8. The circuit of claim 7, wherein the second control unit includes an intermediate relay contact and a trip coil, a first end of the intermediate relay contact being connected to a second end of the heating contact, a second end of the intermediate relay contact being connected to a first end of the trip coil, and a second end of the trip coil being connected to ground.
9. The circuit of claim 8, wherein when the heating temperature satisfies a predetermined dry-heating protection condition, controlling the second control loop to be turned on comprises:
when the heating temperature is higher than a preset temperature threshold value of a mechanical temperature control unit, controlling the conduction of the mechanical temperature control unit and the conduction of the first control loop;
controlling the intermediate relay contacts in the second control loop to close according to the conductive state of the intermediate relay coil in the first control loop.
10. The circuit of claim 8 wherein the third control loop comprises a trip unit trip control unit, the trip coil being connected to the trip unit trip control unit to form the third control loop.
11. The circuit of claim 10, wherein the trip unit trip control unit includes trip contacts for controlling a trip unit to perform a trip operation;
the first end of the tripper contact is connected with the positive pole of a second direct-current power supply, the second end of the tripper contact is connected with the first end of the tripper coil, and the second end of the tripper coil is connected with the negative pole of the second direct-current power supply.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210129573.9A CN114498555A (en) | 2022-02-11 | 2022-02-11 | Prevent dry combustion method protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210129573.9A CN114498555A (en) | 2022-02-11 | 2022-02-11 | Prevent dry combustion method protection circuit |
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| CN114498555A true CN114498555A (en) | 2022-05-13 |
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| CN202210129573.9A Pending CN114498555A (en) | 2022-02-11 | 2022-02-11 | Prevent dry combustion method protection circuit |
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| CN212411064U (en) * | 2020-08-04 | 2021-01-26 | 洛阳万基铝加工有限公司 | Heater control circuit |
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| US20110134578A1 (en) * | 2009-12-07 | 2011-06-09 | Ward Michael J | Heat actuated interrupter receptacle |
| CN202260391U (en) * | 2011-09-30 | 2012-05-30 | 南京金三力橡塑有限公司 | Overtemperature protection circuit for heating thermostatic equipment |
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