CN209806108U - Heating device with low electromagnetic radiation - Google Patents
Heating device with low electromagnetic radiation Download PDFInfo
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- CN209806108U CN209806108U CN201920236578.5U CN201920236578U CN209806108U CN 209806108 U CN209806108 U CN 209806108U CN 201920236578 U CN201920236578 U CN 201920236578U CN 209806108 U CN209806108 U CN 209806108U
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Abstract
A heating device with low electromagnetic radiation mainly comprises heating wires, wiring terminals and a temperature control switch, wherein the heating wires are distributed on the surface of a heated object and used for heating the heated object; the wiring terminal is fixedly arranged at one end of the heating wire and is used for connecting an external power supply through a first conductor and a second conductor at one end of the heating wire, and the first conductor and the second conductor at the other end of the heating wire are in short circuit; the two ends of the temperature control switch are connected with the first conductor or the second conductor of the heating wire and used for breaking the heating wire when the temperature of the heated object detected by the temperature control switch exceeds a threshold value. Because the equal impedance effect is provided from any position of the heating wire to the end point position, the currents on the first conductor and the second conductor are the same and opposite in direction when the heating wire is electrified, so that the generated static electromagnetic fields can be mutually offset, and the electromagnetic radiation influence of the heating wire is reduced to the maximum extent.
Description
Technical Field
the present invention relates to a heating device, and more particularly, to a heating device with low electromagnetic radiation.
Background
PTC material is a semiconductor resistor having a positive temperature coefficient, and its resistance value increases significantly with an increase in temperature when the curie temperature is exceeded. NTC material is a semiconductor resistor with a negative temperature coefficient, the resistance value of which decreases significantly with increasing temperature above the curie temperature. The heating element in the existing local heating products and other products for heat preservation and heating is often made of PTC/NTC materials, wherein a layer of detection line and a layer of PTC heating line are arranged in a PTC insulating layer shell, and a layer of NTC insulating material is filled between the detection line and the PTC heating line.
The PTC heater is a heating device made of a positive temperature coefficient thermosensitive material, and has a characteristic that the resistivity increases with the temperature rise. The common PTC heating element comprises a PTC ceramic heating element, a PTC heating wire, a PTC heating sheet and the like, has the advantages of small thermal resistance and high heat exchange efficiency, and is an automatic constant-temperature and power-saving electric heater. The safety device is characterized in that the surface of an electric heating tube heater does not turn red under any application condition on the safety performance, so that potential safety hazards such as scalding and fire hazards are caused.
At present, the shape of the PTC heating wire can be designed according to requirements, the heating power can be designed from small power to large power, and the PTC heating wire can be used in a voltage range between 12V and 380V, and the PTC heating wire is widely applied to various products based on the advantages. If the electric heating device is applied to common practical products such as hand warmers, dryers, electric heating plates, electric irons and the like, the application effects of low power and high heat efficiency can be realized; the heat-insulating material can also be applied to automatic constant-temperature products such as a constant-temperature tank, an electronic vacuum bottle, a heat-insulating box, a vacuum cup and the like, and can realize the application effects of good constant-temperature characteristic, high heat efficiency and wide temperature range of the use environment; in addition, the device can be applied to hot air type products such as a heater, an electric hair drier, a dryer and the like, and can realize the application effects of high output hot air power, safety, automatic air temperature adjustment and power consumption.
When the existing PTC heating wire is used, after the temperature rises, the resistance value of the PTC heating wire changes according to a certain temperature coefficient, the temperature control is relatively complex, and a complex multi-protection circuit needs to be designed. In addition, the traditional heating products mostly adopt PTC/NTC double-core heating wires, and the existing PTC/NTC double-core heating wires can also cause the break points to be easy to ignite and accumulate heat when the middle wire is locally broken, so that a detection circuit is required to be added, the temperature control circuit is further complicated, and the large-scale application is not facilitated. In addition, the heating part of the existing PTC/NTC double-core heating wire is PTC, the temperature control part is NTC, current mainly flows through the PTC of the single wire to form an electromagnetic field, the size of the electromagnetic field is in direct proportion to the size of the current, and the electromagnetic radiation interference on the heating wire tends to rise along with the increase of power, thereby affecting peripheral electronic equipment and causing harm to the health of users.
Disclosure of Invention
In view of this, the technical problem that this application actually solved is how to reduce the electromagnetic radiation that current two-core heating wire produced in the application. In order to solve the above technical problem, the present application provides a heat generating device with low electromagnetic radiation, which includes:
the heating wire is distributed on the surface of a heated object and used for heating the heated object; the heating wire comprises a core wire, a first conductor, a second conductor, an intermediate insulating layer and an outer cover, the intermediate insulating layer is sleeved on the core wire, the outer cover is sleeved on the intermediate insulating layer, the first conductor is clamped between the core wire and the intermediate insulating layer, and the second conductor is clamped between the intermediate insulating layer and the outer cover;
And the wiring terminal is fixedly arranged at one end of the heating wire and is used for connecting an external power supply through the first conductor and the second conductor at one end of the heating wire, and the first conductor and the second conductor at the other end of the heating wire are in short circuit.
The wiring terminal comprises two pins which are respectively connected with the first conductor and the second conductor at one end of the heating wire, so that the two pins form a conductive loop through the first conductor and the second conductor of the heating wire.
The heating device further comprises a temperature control switch, wherein two ends of the temperature control switch are connected to the first conductor or the second conductor of the heating wire, and the temperature control switch is used for disconnecting the heating wire when detecting that the temperature of the heated object exceeds a threshold value.
The heating device further comprises a plurality of temperature control switches, the temperature control switches are fixedly arranged on the surface of the heated object and are connected in series, and the head end and the tail end of each temperature control switch are connected into one of the pins of the wiring terminal and are used for breaking the circuit of the wiring terminal when the temperature of the heated object detected by any one of the temperature control switches exceeds a threshold value.
the temperature control switch comprises a self-recovery thermistor or a self-recovery fuse.
The heating wire is coiled and distributed on the surface of the pad.
The heating device also comprises a substrate, the substrate is assembled on the surface of the pad, and the heating wire is clamped between the substrate and the pad.
The first conductor is helically wound around the core wire and the second conductor is helically wound around the intermediate insulating layer.
The core wire of the heating wire comprises a polyester twisted wire, a cotton wire or a nylon wire, the middle insulating layer of the heating wire is integrally formed by PVC (polyvinyl chloride) materials, PTC (positive temperature coefficient) materials, resin or plastics through injection molding, and the first conductor and the second conductor of the heating wire are both made of resistance materials.
The beneficial effect of this application is:
The heating device with low electromagnetic radiation according to the above embodiment mainly comprises a substrate, heating wires, a wiring terminal and a temperature control switch, wherein the heating wires are distributed on the surface of the heated object and used for heating the heated object; the wiring terminal is fixedly arranged at one end of the heating wire and is used for connecting an external power supply through a first conductor and a second conductor at one end of the heating wire, and the first conductor and the second conductor at the other end of the heating wire are in short circuit; the two ends of the temperature control switch are connected with the first conductor or the second conductor of the heating wire and used for breaking the heating wire when the temperature of the heated object detected by the temperature control switch exceeds a threshold value. On the first hand, because the equal impedance effect is provided from any position of the heating wire to the end point position, the currents on the first conductor and the second conductor are the same and opposite in direction when the heating wire is electrified, so that the generated static electromagnetic fields can be mutually offset, and the electromagnetic radiation influence of the heating wire is reduced to the maximum extent; in the second aspect, because the connecting terminal is directly connected with one end of the heating wire, the other end of the heating wire can be freely extended and distributed on a heated object, which is beneficial to freely routing the heating wire and conveniently connecting the heating wire to an external power supply; in the third aspect, the temperature control switch is connected with the first conductor or the second conductor of the heating wire, so that the heating device claimed by the application has the temperature control self-protection capability, and the heating wire can be disconnected when the temperature of the heated object is overhigh, so that the heating device is prevented from being continuously electrified and heated; in the fourth aspect, the heating wire is coiled and is fully distributed on the surface of the pad, so that the pad is uniformly heated, the electromagnetic radiation between the wires is weakened, and the electromagnetic radiation influence of the heating device is further reduced.
Drawings
FIG. 1 is a block diagram of a heat generating device in one embodiment;
FIG. 2 is a block diagram of a heat generating device in another embodiment;
FIG. 3 is a structural view of a heat generating device in still another embodiment;
Fig. 4 is a structural view of the heat generating line.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
the numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
The first embodiment is as follows:
Referring to fig. 1, the present application discloses a heating device with low electromagnetic radiation, which mainly includes a heated object 11, a heating wire 12 and a connection terminal 13, which will be described separately below.
the heated object 11 is a heating body that can be directly contacted by a user, and can be disposed in a place needing heating as a heat source, such as a seat, a mattress, an incubator, a thermostatic bath, a wall, and the like, in order to ensure a heating effect, the heated object 11 in this embodiment is preferably made of a material such as a fiber fabric, a plastic, and the like, and the shape of the heated object 11 can be freely set according to the user's requirement, and is not limited herein.
The heating wire 12 is distributed on the surface of the heated object 11 to heat the heated object 11. In one embodiment, see fig. 4, the heat generating wire of the present application includes a core 123, a first conductor 121, a second conductor 122, an intermediate insulating layer 124, and an outer cover 125. The intermediate insulating layer 124 is provided on the core wire 123, the outer cover 125 is provided on the intermediate insulating layer 124, the first conductor 121 is sandwiched between the core wire 123 and the intermediate insulating layer 124, and the second conductor 122 is sandwiched between the intermediate insulating layer 124 and the outer cover 125. The first conductor 121 and the second conductor 122 may be made of a resistive material, corresponding to a heat generating resistor. Wherein, the core wire 123 may include a polyester twisted wire, a cotton wire or a nylon wire, etc., and the outer cover 125 may be made of an insulating material; the first conductor 121 and the second conductor 122 of the heating wire 12 are made of a resistive material, such as a resistance wire, and the resistance value can be set according to the heating value required by the user, which is not limited herein.
Further, the first conductor 121 is spirally wound on the core wire 123, and the second conductor 122 is spirally wound on the intermediate insulating layer 124. As can be understood by those skilled in the art, when the heating wire 12 is powered on, the currents on the first conductor 121 and the second conductor 122 are the same and have opposite directions, and an equal impedance effect is provided from any position to an end position, so that the static electromagnetic fields generated by the first conductor 121 and the second conductor 122 have the characteristics of equal field intensity and opposite directions, and the static electromagnetic fields of the first conductor and the second conductor can cancel each other out, so that the heating wire 12 and the heating device of the present application have the application effect of low electromagnetic radiation.
Further, the intermediate insulating layer 124 may be integrally injection-molded by PVC material, silicon rubber, resin or plastic, ensuring an insulating and isolating effect between the first conductor 121 and the second conductor 122. .
the connection terminal 13 is fixedly disposed at one end of the heating wire 12, and is used for connecting an external power source through the first conductor and the second conductor at one end of the heating wire 12, and the first conductor and the second conductor at the other end of the heating wire 12 are short-circuited. In one embodiment, see fig. 1, the connection terminal 13 includes two leads (such as 131, 132), and the leads 131, 132 are respectively connected to the first conductor 121 and the second conductor 122 at one end of the heating wire 12; and the first conductor 121 and the second conductor 122 at the other end of the heating wire 12 can be shorted by the other connection terminal 15, so that the two legs (131, 132) form a conductive loop through the first conductor 121 and the second conductor 122 of the heating wire 12. Then, when the pins 131 and 132 of the connection terminal 13 are connected to an external power source, the current forms a reverse circulation loop along the first conductor 121 and the second conductor 122 of the heating wire 12, and both the first conductor 121 and the second conductor 122 generate heat through impedance; in addition, because the current flows in the opposite directions of different conductors, static electromagnetic fields generated by the two conductors can be mutually offset, and the application effect of ultralow electromagnetic radiation is achieved. It should be noted that the external power source may be ac power or low-voltage dc power, which is not limited herein.
Further, as shown in fig. 1, the heated object 11 may be a pad, and the heating wire 12 is coiled and distributed on the surface of the pad, so that the pad can be uniformly heated when the heating wire 12 is powered on. It should be understood by those skilled in the art that the heating wire 12 may also form other forms of routing effects on the surface of the pad, such as a circular type and a cross type, and the serpentine form adopted in the present embodiment does not limit the technical solution.
Further, the heating device claimed in the present embodiment further includes a substrate (not shown), and the substrate can be mounted on the surface of the pad, so that the heating wire is clamped between the substrate and the pad, and thus, the heating wire 12 is disposed inside the substrate and the pad, and the application effects of the heating device, such as beautiful appearance, safety and touch prevention, are achieved.
Example two:
Referring to fig. 2, in addition to the heating apparatus with a heating wire claimed in the above embodiment, the heating apparatus further includes a temperature controlled switch 14, and two ends of the temperature controlled switch 14 are connected to the first conductor 121 or the second conductor 122 of the heating wire 12, and are used for disconnecting the heating wire 12 when the temperature controlled switch 14 detects that the temperature of the heated object 11 exceeds the threshold value.
The temperature control switch 14 may be disposed in the middle of the heating wire 12, and the second conductor 122 of the heating wire 12 is cut off to connect the two ends of the temperature control switch 14. The temperature-controlled switch 14 can also be connected to one end of the heating wire 12 by a wire, for example, as shown in fig. 2, one conductor (the first conductor 121 or the second conductor 122) of the heating wire 12 is led out from the connection terminal 13 to one end of the temperature-controlled switch 14, and the other end of the temperature-controlled switch 14 is connected to the pin 132 of the connection terminal 13, so that the temperature-controlled switch 14 is connected in series without destroying the integrity of the heating wire 12.
In another embodiment, see fig. 3, a variant of the connection terminal 13 'and the temperature-dependent switch 14' can be used. The connection terminal 13 'includes two connection pins 131' and 132 'respectively connected to two wires of a two-phase plug, the pin 131' is further connected to one conductor (e.g., the first conductor 121) at one end of the heating wire 12, and the other conductor (e.g., the second conductor 122) at one end of the heating wire 12 is led out from the connection terminal 13 'to one end of the temperature controlled switch 14'. The heating device with the heating wire comprises a plurality of temperature control switches 14 ', each temperature control switch 14 ' is fixedly arranged on the surface of a heated object 11, each temperature control switch 14 ' is sequentially connected in series, and the head end and the tail end of each temperature control switch 14 ' are connected into one path of pins (such as the pin 132 ') of the connecting terminal, and are used for breaking the connecting terminal 13 ', especially the pin 132 ' of the breaking connecting terminal 13 ', when any one temperature control switch 14 ' detects that the temperature of the heated object 11 exceeds a threshold value.
Further, the temperature control switch includes a self-recovery thermistor or a self-recovery fuse, and is automatically turned off when detecting that the temperature of the heated object 11 is too high, and is automatically turned on when detecting that the temperature of the heated object 11 reaches a normal temperature.
Further, referring to fig. 2 or fig. 3, the heated object 11 may be a pad, and the heating wire 12 is disposed in a serpentine shape and is distributed on a surface of the pad, so that the pad can be uniformly heated when the heating wire 12 is powered on. It should be understood by those skilled in the art that the heating wire 12 may also form other forms of routing effects on the surface of the pad, such as a circular type and a cross type, and the serpentine form adopted in the present embodiment does not limit the technical solution.
Further, the heating device with the heating wire claimed in the present embodiment further includes a substrate (not shown in the drawings), and the substrate can be mounted on the surface of the pad, so that the heating wire is clamped between the substrate and the pad, and thus, the heating wire 12 is disposed inside the substrate and the pad, and the application effects of the heating device, such as beautiful appearance, safety and touch prevention, are achieved.
It should be noted that, in the heating device in the present technical solution, only the middle snake-shaped trace portion of the static electromagnetic field is generated, and the first conductor and the second conductor of the heating wire 12 form electromagnetic fields with opposite directions, so as to promote the static electromagnetic radiation to cancel each other. Through actual measurement of professional equipment, the geomagnetic intensity is about 0.2mGauss, the test value of electromagnetic radiation of the product is about 0.3mGauss, and the electromagnetic radiation of similar products in the market is about 5-10 times of that of the product.
It should be noted that the electromagnetic radiation generated by the heating device in the technical scheme is relatively small, meets the requirement of international electromagnetic radiation (EMF) on ensuring human health, hardly causes influence on human health, and is not limited by heating power. In addition, the heating wire can be randomly arranged on a heated object, and other peripheral electronic equipment cannot be influenced.
the present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (9)
1. A heat-generating device with low electromagnetic radiation, comprising:
The heating wire is distributed on the surface of a heated object and used for heating the heated object; the heating wire comprises a core wire, a first conductor, a second conductor, an intermediate insulating layer and an outer cover, the intermediate insulating layer is sleeved on the core wire, the outer cover is sleeved on the intermediate insulating layer, the first conductor is clamped between the core wire and the intermediate insulating layer, and the second conductor is clamped between the intermediate insulating layer and the outer cover;
And the wiring terminal is fixedly arranged at one end of the heating wire and is used for connecting an external power supply through the first conductor and the second conductor at one end of the heating wire, and the first conductor and the second conductor at the other end of the heating wire are in short circuit.
2. The heat generating device of claim 1, wherein the terminal comprises two legs connected to the first conductor and the second conductor of one end of the heat generating wire, respectively, such that the two legs form a conductive loop through the first conductor and the second conductor of the heat generating wire.
3. The heat generating device according to claim 2, further comprising a temperature control switch, wherein both ends of the temperature control switch are connected to the first conductor or the second conductor of the heat generating wire, and the temperature control switch is configured to open the heat generating wire when the temperature control switch detects that the temperature of the heated object exceeds a threshold value.
4. The heating device according to claim 2, further comprising a plurality of temperature controlled switches, each of which is fixedly disposed on a surface of the heated object, each of the temperature controlled switches is connected in series, and a head end and a tail end of each of the temperature controlled switches are connected to one of the pins of the connection terminal, so as to open the connection terminal when any one of the temperature controlled switches detects that the temperature of the heated object exceeds a threshold value.
5. a heat-generating device as claimed in claim 3 or 4, wherein the temperature controlled switch comprises a self-healing thermistor or a self-healing fuse.
6. the heat generating device according to any one of claims 1 to 4, wherein the heated object comprises a pad, and the heat generating wire is routed in a serpentine shape and is distributed on the surface of the pad.
7. The heat-generating device according to claim 6, further comprising a substrate mounted to a surface of the pad, the heat-generating wire being sandwiched between the substrate and the pad.
8. The heat-generating device of claim 1, wherein the first conductor is helically wound around the core wire and the second conductor is helically wound around the intermediate insulating layer.
9. The heat generating device as claimed in claim 8, wherein the core wire of the heat generating wire comprises a twisted polyester wire, a cotton wire or a nylon wire, the middle insulating layer of the heat generating wire is integrally injection-molded from a PVC material, a silicone rubber, a resin or a plastic, and the first conductor and the second conductor of the heat generating wire are each made of a resistive material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920236578.5U CN209806108U (en) | 2019-02-25 | 2019-02-25 | Heating device with low electromagnetic radiation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920236578.5U CN209806108U (en) | 2019-02-25 | 2019-02-25 | Heating device with low electromagnetic radiation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209806108U true CN209806108U (en) | 2019-12-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920236578.5U Active CN209806108U (en) | 2019-02-25 | 2019-02-25 | Heating device with low electromagnetic radiation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209806108U (en) |
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2019
- 2019-02-25 CN CN201920236578.5U patent/CN209806108U/en active Active
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