Thin-wall annular PTC heater
By designing a thin-walled annular PTC heater with a shell consisting of a ring and a cover plate, the problem of traditional PTC heaters being unable to heat cylindrical surfaces is solved, achieving rapid and uniform heating.
Patent Information
- Application Number
- CN202423068359.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2026-01-16
- Estimated Expiration
- 2034-12-12
AI Technical Summary
Traditional PTC heaters have a planar structure, which cannot effectively heat the cylindrical surface of a product or a small space, thus limiting their application.
A thin-walled annular PTC heater is designed, which uses an annular body and a cover plate to form the outer shell. The annular body has an arc-shaped groove, and the PTC chip assembly is placed in the groove and connected by wires to form an annular structure. An insulating layer is set on the cover plate and the annular body to improve the thermal conductivity.
It enables rapid and uniform heating of the cylindrical surface of the product, making it suitable for confined spaces and meeting application requirements.
Smart Images
Figure CN223809925U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a PTC heater based on PTC, especially to a thin-wall annular PTC heater. BACKGROUND
[0002] The PTC thermistor is a kind of thermosensitive element, and its resistance value increases with the temperature rise of resistance body in a characteristic range, and the PTC thermistor is used for temperature compensation, overcurrent protection, overheat protection, constant temperature heating and other purposes in the fields of military, electronics, communication, household appliance and industry by using its resistance-temperature characteristic, voltage-current characteristic and time-current characteristic.
[0003] The PTC heater is formed by installing one or more PTC thermistors together, and is mainly used for heating a specific surface (plane or curved surface), and its working principle is that when a certain voltage is applied between two electrodes, the PTC heater generates heat due to power consumption, and when the heat generation temperature exceeds a design temperature point, the resistance of the product sharply increases in a short time, so that the power consumption is reduced, the product temperature is automatically stabilized at the required temperature point, and the purpose of constant temperature control is achieved.
[0004] The traditional PTC heater is generally a plane structure, mainly composed of a shell, a PTC chip (i.e. bare PTC thermistor) and lead wires.
[0005] The traditional PTC heater has the following defects: since it is a plane structure, it cannot heat the cylindrical surface of the product, and it cannot heat the cylindrical surface of the product in a narrow space, so its application is limited. UTILITY MODEL CONTENT
[0006] The utility model aims to solve the above problems and provides a thin-wall annular PTC heater for heating the cylindrical surface of the product in a narrow space.
[0007] The utility model achieves the above-mentioned purposes through the following technical solutions:
[0008] A thin-walled annular PTC heater comprises a shell and a PTC chip assembly formed by connecting a plurality of PTC chips in parallel, the shell comprises a circular ring body and a cover plate, the circular ring body is circular, and a circular-arc groove is arranged on the outer wall of the circular ring body; the electrodes of the plurality of rectangular PTC chips are connected together by wires (bare metal wires, preferably bare copper wires) to form a circular-arc PTC chip assembly; the PTC chip assembly is arranged in the circular-arc groove, and the circular-arc cover plate is arranged on the opening of the circular-arc groove; two wires (metal wires, preferably copper wires, and the surfaces of the wires are provided with insulating layers) connected with the two electrodes of the plurality of PTC chips pass through the wire passing holes in the circular ring body to form two power input wires of the thin-walled annular PTC heater.
[0009] As a preferred, in order to facilitate processing and assembly, the circular-arc groove is two and symmetrically arranged on the opposite outer walls of the circular ring body, the wire passing holes are arranged on the groove partition parts between the adjacent two ends of the two circular-arc grooves, the first ends of the two PTC chip assemblies are close to each other, the second ends of the two PTC chip assemblies are close to each other, the two electrodes of the first ends of the two PTC chip assemblies are connected by wires which pass through the corresponding wire passing holes, one of the electrodes of the second ends of one PTC chip assembly is connected with a wire, the outer end of the wire passes through the corresponding wire passing hole and the corresponding hole in one end of the cover plate and is arranged outside the shell to form one power input wire, and one of the electrodes of the second ends of the other PTC chip assembly is connected with a wire, the outer end of the wire passes through the corresponding wire passing hole and the corresponding hole in one end of the other cover plate and is arranged outside the shell to form the other power input wire.
[0010] As a preferred, in order to make the outer wall of the cover plate substantially flush with the outer wall of the circular ring body and facilitate mutual connection, the groove wall of the circular-arc groove is provided with an L-shaped step near the opening, and the edge of the cover plate is arranged on the L-shaped step and is connected by adhesion.
[0011] As a preferred, in order to improve the conductivity of the wires to reduce the connection resistance between the PTC chips, and to ensure the heat conduction performance of the circular ring body and the cover plate and make the surfaces thereof have insulation performance, the wires are tinned copper wires, the circular ring body is an aluminum alloy body, the cover plate is an aluminum alloy plate, and the surfaces of the circular ring body and the cover plate are provided with insulating layers by anode treatment.
[0012] The thin-walled annular PTC heater has the advantages that:
[0013] The utility model discloses a circular ring body and the cover plate of interconnection are designed, the circular arc recess is set up on the circumference outer wall of circular ring body and the PTC chip assembly of circular arc is placed in the circular arc recess, makes the whole PTC heater form thin wall annular structure, can heat the cylindrical surface of product, also can heat the cylindrical surface of product in the narrow space, and heating speed is fast, heating is even, makes it satisfy application demand. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 It is the perspective view of the thin wall annular PTC heater of the utility model after assembly;
[0015] Figure 2 It is the perspective explosion view of the thin wall annular PTC heater of the utility model before assembly;
[0016] Figure 3 It is the perspective view of the PTC chip of the thin wall annular PTC heater of the utility model;
[0017] Figure 4 It is the perspective view of the two PTC chip assemblies of the thin wall annular PTC heater of the utility model after connection;
[0018] Figure 5 It is the perspective view of the circular ring body of the thin wall annular PTC heater of the utility model;
[0019] Figure 6 It is the perspective view of the two PTC chip assemblies of the thin wall annular PTC heater of the utility model in the positioning tooling and carries out welding. DETAILED DESCRIPTION
[0020] The utility model will be further explained in connection with the drawings:
[0021] As Figures 1-5 The utility model discloses a thin wall annular PTC heater includes shell and by a plurality of PTC chip 5 and become in parallel PTC chip assembly (not marked separately in the drawing), the shell includes circular ring body 2 and cover plate 3, and the circumference outer wall of circular ring body 2 is equipped with circular arc recess 6, and one electrode 8 between a plurality of rectangular PTC chip 5, another electrode 8 between a plurality of PTC chip 5 is connected together through wire 4 and forms the PTC chip assembly of circular arc respectively, the PTC chip assembly is placed in circular arc recess 6 and the circular arc cover plate 3 is installed in the slot of circular arc recess 6, and two lead wires 1 (the lead wire 1 of the utility model is collectively referred to, and the lead wire 1 in different positions is not the same wire 1, and possibly not the same lead wire 1, and the same below) respectively with two electrodes 8 of a plurality of PTC chip 5 are connected and pass through the wire through hole 9 on the circular ring body 2 and form two power supply input lead wires (not marked separately in the drawing) of the thin wall annular PTC heater of the utility model.
[0022] As Figures 1-5 shown, the utility model discloses the following more optimized specific structure:
[0023] In order to facilitate processing and assembly, two arc grooves 6 are symmetrically arranged on the opposite two sides of the outer wall of the circular ring body 2, the recess partition part 7 is formed between the adjacent two ends of the two arc grooves 6 on the circular ring body 2, the threading through hole 9 is arranged on the recess partition part 7, the two PTC chip assemblies are respectively arranged in the two arc grooves 6, the first ends of the two PTC chip assemblies are close to each other, the second ends of the two PTC chip assemblies are close to each other, the two electrodes of the first ends of the two PTC chip assemblies (also one of the electrodes 8 of the corresponding PTC chip) are connected by the lead wire 1, and the lead wire 1 passes through the corresponding threading through hole 9, one of the electrodes of the second end of one PTC chip assembly (also one of the electrodes 8 of the corresponding PTC chip) is connected with the lead wire 1, and the outer end of the lead wire 1 passes through the corresponding threading through hole 9 and the corresponding through hole of one end of the cover plate 3 and is located outside the shell to form a power input lead wire, and one of the electrodes of the second end of the other PTC chip assembly (also one of the electrodes 8 of the corresponding PTC chip) is connected with the lead wire 1, and the outer end of the lead wire 1 passes through the corresponding threading through hole 9 and the corresponding through hole of one end of the other cover plate 3 and is located outside the shell to form another power input lead wire.
[0024] In order to make the outer wall of the cover plate 3 and the outer wall of the circular ring body 2 basically flush and facilitate mutual connection, the position close to the slot in the groove wall of the circular ring groove 6 is provided with an "L" shaped step (not marked separately in the figure), and the edge of the cover plate 3 is placed on the "L" shaped step and is connected by sticking.
[0025] In order to improve the conductivity of the lead wire 4 to reduce the connection resistance between the PTC chips 5, and to ensure the heat conduction performance of the circular ring body 2 and the cover plate 3 and make the surface have insulation performance, the lead wire 4 is a tinned copper wire, the circular ring body 2 is an aluminum alloy body, the cover plate 3 is an aluminum alloy plate, and the surfaces of the circular ring body 2 and the cover plate 3 are all formed with an insulation layer by anode treatment.
[0026] As Figures 1-6As shown, when processing the PTC chip 5, according to the size of the annular groove 6 on the annular body 2, the flat original PTC chip is sliced to form the rectangular PTC chip 5; when processing the PTC chip assembly, the plurality of PTC chips 5 are sequentially placed in the two arc-shaped grooves of the positioning tool 10, the upper and lower ends of each PTC chip 5 are respectively two electrodes 8, after the arrangement, the solder is used to weld the wires 4 between the upper end electrodes 8 of all PTC chips 5, after welding, the whole is turned over, and the solder is used to weld the wires 4 between the upper end electrodes 8 of all PTC chips 5 again, that is, two arc-shaped PTC chip assemblies are formed; when assembling the PTC heater, the two PTC chip assemblies are respectively placed in the two annular grooves 6 and tightly attached to the groove bottom of the annular groove 6, the two wires 1 are respectively passed through the corresponding wire passing holes 9 and respectively welded and connected with the electrodes at the first end of the two PTC chip assemblies, the other two wires 1 are respectively crossed through the corresponding wire passing holes 9 and the corresponding through holes of the two cover plates 3, and the inner ends thereof are respectively welded and connected with different electrodes at the second end of the two PTC chip assemblies, after coating the adhesive on the "L" shaped step of the annular groove 6, the inner surface edge of the two cover plates 3 is tightly attached to the "L" shaped step, finally, the adhesive is coated between the corresponding through holes of the two cover plates 3 and the corresponding wires 1, the sealing structure of the PTC heater is formed, and the thin-walled annular PTC heater as shown in Figure 1 is obtained.
[0027] As shown in Figures 1-5 , in use, only the thin-walled annular PTC heater is sleeved on the cylindrical surface of the product to be heated, and the outer ends of the two wires 1 are connected with the power supply, so that the purpose of quickly and uniformly heating the cylindrical surface of the product is achieved.
[0028] The above embodiments are only preferred embodiments of the present application, and are not a limitation on the technical solutions of the present application. Any technical solutions that can be realized on the basis of the above embodiments without creative labor shall be considered to fall within the protection scope of the patent of the present application.
Claims
1. A thin-walled annular PTC heater comprising a housing and a PTC chip assembly formed by connecting a plurality of PTC chips in parallel, characterized in that: The shell comprises a circular ring body and a cover plate, an arc-shaped groove is arranged on the circumferential outer wall of the circular ring body, a plurality of long rectangular PTC chips are connected together by wires between one electrode of each PTC chip and another electrode of each PTC chip to form an arc-shaped PTC chip assembly, the PTC chip assembly is arranged in the arc-shaped groove, and the arc-shaped cover plate is arranged on the groove of the arc-shaped groove and connected with two electrodes of the plurality of PTC chips, respectively, two power input leads of the thin-walled annular PTC heater are formed by passing through the threading through holes on the circular ring body.
2. The thin-walled annular PTC heater according to claim 1, characterized in that: The arc-shaped grooves are two and symmetrically arranged on the opposite outer walls of the circular ring body, groove partition parts are formed on the circular ring body between the adjacent two ends of the two arc-shaped grooves, the threading through holes are arranged on the groove partition parts, the two PTC chip assemblies are arranged in the two arc-shaped grooves, respectively, the first ends of the two PTC chip assemblies are close to each other, the second ends of the two PTC chip assemblies are close to each other, the two electrodes of the first ends of the two PTC chip assemblies are connected by wires, respectively, and the wires pass through the corresponding threading through holes, one of the electrodes of the second ends of one PTC chip assembly is connected with a wire, the outer end of the wire passes through the corresponding threading through hole and the corresponding through hole of one end of the cover plate and is arranged outside the shell to form one power input lead, and one of the electrodes of the second ends of the other PTC chip assembly is connected with a wire, the outer end of the wire passes through the corresponding threading through hole and the corresponding through hole of one end of the other cover plate and is arranged outside the shell to form the other power input lead.
3. A thin-walled annular PTC heater according to claim 1 or 2, characterised in that: An "L"-shaped step is arranged on the groove wall of the arc-shaped groove, the edge of the cover plate is arranged on the "L"-shaped step and is connected by adhesion.
4. The thin-walled annular PTC heater according to claim 1 or 2, characterized in that: The wires are tinned copper wires, the circular ring body is an aluminum alloy body, the cover plate is an aluminum alloy plate, and the surfaces of the circular ring body and the cover plate are formed with insulating layers by anode treatment.