Constant-temperature PTC (Positive Temperature Coefficient) pipeline heater

Abstract

The utility model relates to a constant-temperature PTC (Positive Temperature Coefficient) pipeline heater which comprises an inner pipe, a plurality of aluminum pipes are arranged on the peripheral side wall of the inner pipe, a mounting groove is formed in one end of each aluminum pipe in the length direction, PTC heating bodies are mounted in the mounting grooves, the periphery of each PTC heating body is wrapped with an insulating film, and the insulating films are attached to the inner peripheral wall of the mounting groove; the outer pipe is arranged outside the inner pipe, the aluminum pipes are arranged between the inner pipe and the outer pipe, the outer wall of each aluminum pipe is tightly attached to the inner wall of the outer pipe, and the outer circumferential wall of the outer pipe is wrapped with heat preservation cotton. A plastic ring is arranged on the outer ring of the heat preservation cotton, a heat conduction ring is arranged in the plastic ring, a temperature controller is arranged on the plastic ring, a heat conduction block is arranged on the peripheral wall of the heat conduction ring and makes contact with the temperature sensing face of the temperature controller, and the temperature controller is used for controlling the heating temperature of the PTC heating body. The heat conduction ring is further provided with a fuse, the fuse is connected with the temperature controller in series, and when the temperature controller fails, the fuse controls the heating temperature of the PTC heating body. The utility model has the effect of reducing the possibility of burning loss of the PTC heating body.

Description

Technical Field

[0001] The utility model relates to the field of heaters, in particular to a constant temperature PTC pipeline heater. Background Art

[0002] PTC heating element is also called PTC heater, which is composed of PTC ceramic heating element and aluminum tube. This type of PTC heating element has the advantages of small thermal resistance and high heat exchange efficiency.

[0003] The PTC pipe heater includes an inner tube for liquid to flow through, and a PTC heater is installed on the circumferential side wall of the inner tube through an aluminum tube. A mounting groove for inserting the PTC heater is provided on the side wall at one end of the length direction of the aluminum tube. The aluminum tube is fixedly installed on the inner tube by gluing. Several aluminum tubes are arranged along the circumference of the inner tube. The shell of the PTC heater is welded in the mounting groove, and the wire of the PTC heater is exposed outside the mounting groove. When the PTC heater is under high load or high voltage fluctuation, the PTC heater may be overloaded with current and overheated and burned, which will affect the service life of the PTC. Utility Model Content

[0004] In order to solve the above technical problems, the present application provides a constant temperature PTC pipe heater.

[0005] The constant temperature PTC pipe heater provided in this application adopts the following technical solution:

[0006] A constant temperature PTC pipe heater, comprising an inner tube, a plurality of aluminum tubes are arranged on the peripheral side wall of the inner tube, a mounting groove is opened at one end of the aluminum tube in the length direction, a PTC heating element is installed in the mounting groove, an electrode is respectively arranged on the upper and lower sides of the PTC heating element, and the outer periphery of each PTC heating element is wrapped with an insulating film, and the insulating film is in contact with the inner peripheral wall of the mounting groove;

[0007] An outer tube is arranged outside the inner tube, the aluminum tube is arranged between the inner tube and the outer tube, the outer wall of each aluminum tube is tightly fitted with the inner wall of the outer tube, and the outer peripheral wall of the outer tube is covered with thermal insulation cotton;

[0008] The outer ring of the thermal insulation cotton is provided with a plastic ring, the plastic ring is arranged close to the water inlet end of the inner tube, a heat-conducting ring is arranged inside the plastic ring, a thermostat is arranged on the plastic ring, a heat-conducting block is arranged on the outer peripheral wall of the heat-conducting ring, the heat-conducting block is in contact with the temperature-sensing surface of the thermostat, and the thermostat is used to control the heating temperature of the PTC heating element;

[0009] A fuse is also provided on the heat-conducting ring, and the fuse is connected in series with the thermostat. When the thermostat fails, the fuse controls the heating temperature of the PTC heater. When the heating temperature of the PTC heater continues to rise and exceeds the temperature of the fuse, the fuse is disconnected and sends a disconnection signal to the control system to allow the control system to cut off the circuit where the PTC heater is located.

[0010] Preferably, a circle of mounting ring plate is integrally formed on the inner circumferential wall of one end of the plastic ring close to the water inlet end of the inner tube, the heat conductive ring is fixedly connected to the mounting ring plate, and a groove for making way for the heat conductive block is provided on the inner wall of the mounting ring plate, and the groove runs through both sides of the mounting ring plate in the thickness direction, and an embedding groove for embedding the temperature controller is provided on the plastic ring, and the embedding groove runs through both sides of the plastic ring in the thickness direction.

[0011] Preferably, a mounting plate is further provided on the outer peripheral wall of the heat conductive ring, a receiving groove for receiving the mounting plate is provided on the inner wall of the plastic ring, a U-shaped groove for installing a fuse is provided on the mounting plate, and the fuse is fixed in the U-shaped groove.

[0012] Preferably, the mounting ring plate is provided with a limiting hole for the wire of the PTC heating element to pass through.

[0013] Preferably, the limiting hole is a waist-shaped hole, and two adjacent wires of two adjacent different PTC heating elements pass through the same limiting hole.

[0014] Preferably, a connecting plate is further provided on the outer peripheral wall of the heat-conducting ring, and the connecting plate and the heat-conducting block are symmetrically located on both sides of the radial direction of the heat-conducting ring. A connecting hole is opened on the connecting plate, and a countersunk screw is passed through the connecting hole. The countersunk screw is connected to the inner tube thread after passing through the connecting hole.

[0015] Preferably, a partition is further provided on the outer peripheral wall of the heat conducting ring, and two partitions are provided at intervals along the circumference of the heat conducting ring and are partition one and partition two respectively, and two mounting plates are also provided at intervals and are mounting plate one and mounting plate two respectively;

[0016] The heat conducting block, the first partition plate, the first mounting plate, the connecting plate, the second mounting plate and the second partition plate are sequentially arranged between two adjacent limiting holes.

[0017] Preferably, one end of the PTC heater shell in the length direction is flush with a side of the aluminum tube in the length direction close to the water inlet end of the inner tube, a limiting plate is fixedly connected to the inner wall of the plastic ring, a side of the limiting plate away from the water inlet end of the inner tube abuts against the shell of the PTC heater, the shells of two adjacent different PTC heaters abut against the same limiting plate, and an auxiliary hole is provided on the limiting plate for the wires of the PTC heater to pass through.

[0018] Preferably, the auxiliary hole is a waist-shaped hole, and two adjacent wires of two adjacent different PTC heating elements pass through the same auxiliary hole.

[0019] Preferably, the inner tube and the aluminum tube are interference fit through an expansion tube process.

[0020] In summary, this application includes the following beneficial technical effects:

[0021] The thermostat controls the temperature of the PTC heater to reduce the burning of the PTC heater. When the thermostat fails, the temperature of the PTC heater rises due to current overload. The PTC heater transfers the temperature to the thermostat through the heat conductive block. The temperature of the thermostat continues to rise as the current continues to increase. Since the fuse and the thermostat are connected in series, the fuse senses the current overload, the fuse disconnects and sends a disconnect signal to the control system to cut off the circuit where the PTC heater is located to prevent the PTC heater from burning. The thermostat and fuse are used together to provide double protection for the PTC heater, greatly reducing the possibility of burning of the PTC heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of a constant temperature PTC pipe heater in an embodiment of the present application.

[0023] Figure 2 This is a schematic diagram of the structure of the inner tube, aluminum tube, and PTC heating element after the plastic ring and the heat-conducting ring are moved in an embodiment of the present application.

[0024] Figure 3 It is a structural schematic diagram used to show one side of the water inlet end of the heater in the embodiment of the present application.

[0025] Explanation of the reference numerals in the accompanying drawings: 1. Inner tube; 11. Stainless steel end cover; 12. Outer tube; 2. Aluminum tube; 21. Mounting groove; 3. PTC heating element; 4. Thermal insulation cotton; 5. Plastic ring; 51. Mounting ring plate; 52. Displacement groove; 53. Embedded groove; 54. Accommodating groove; 55. Limiting hole; 56. Connecting groove; 57. Partition groove; 6. Thermal conductive ring; 61. Thermal conductive block; 62. Mounting plate one; 63. Mounting plate two; 64. U-shaped groove; 65. Connecting plate; 651. Connecting hole; 66. Partition plate one; 67. Partition plate two; 7. Thermostat; 8. Limiting plate; 81. Auxiliary hole. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1-3 This application is described in further detail.

[0027] The embodiment of the present application discloses a constant temperature PTC pipe heater.

[0028] Reference Figure 1-3The constant temperature PTC pipe heater includes an inner tube 1. In this embodiment, the inner tube 1 is made of stainless steel. Both ends of the inner tube 1 are fixedly connected with a stainless steel end cap 11, and the inner tube 1 can be connected to the pipe through the stainless steel end cap 11. Six aluminum tubes 2 are fixedly connected to the peripheral wall of the inner tube 1. An installation groove 21 is opened at one end of the length direction of the aluminum tube 2. A PTC heating element 3 is installed in the installation groove 21. There is an electrode on the upper and lower sides of the PTC heating element 3. The outer periphery of each PTC heating element 3 is wrapped with an insulating film, and the insulating film is in contact with the inner peripheral wall of the installation groove 21. The inner tube 1 and the aluminum tube 2 are interference fit through the expansion tube process, so that the contact between the inner tube 1 and the aluminum tube 2 is closer, which is conducive to the conduction of heat.

[0029] An outer tube 12 is arranged outside the inner tube 1, and the aluminum tube 2 is fixed between the inner tube 1 and the outer tube 12. The outer wall of each aluminum tube 2 is tightly fitted with the inner wall of the outer tube 12, and the outer peripheral wall of the outer tube 12 is covered with thermal insulation cotton 4;

[0030] A plastic ring 5 is provided on the outer ring of the thermal insulation cotton 4, and the plastic ring 5 is arranged close to the water inlet end of the inner tube 1. A heat-conducting ring 6 is arranged inside the plastic ring 5, and a thermostat 7 is arranged on the plastic ring 5. The thermostat 7 is electrically connected to each PTC heating element 3. A heat-conducting block 61 is arranged on the outer peripheral wall of the heat-conducting ring 6. The heat-conducting block 61 is in contact with the temperature-sensing surface of the thermostat 7. The thermostat 7 is used to control the heating temperature of the PTC heating element 3.

[0031] A fuse is also provided on the heat-conducting ring 6, and the fuse is connected in series with the thermostat 7. When the thermostat 7 fails, the fuse controls the heating temperature of the PTC heater 3. When the heating temperature of the PTC heater 3 continues to rise and exceeds the temperature of the fuse, the fuse disconnects and sends a disconnect signal to the control system to allow the control system to cut off the circuit where the PTC heater is located.

[0032] The thermostat 7 controls the temperature of the PTC heater 3 to reduce the burning of the PTC heater 3. When the thermostat 7 fails, the temperature of the PTC heater 3 rises due to current overload, and the PTC heater 3 transfers the temperature to the thermostat 7 through the heat conductive block 61. The temperature of the thermostat 7 continues to rise as the current continues to increase. Since the fuse and the thermostat 7 are connected in series, the fuse senses the current overload, the fuse disconnects and sends a disconnect signal to the control system to let the control system cut off the circuit where the PTC heater is located to prevent the PTC heater 3 from burning. The thermostat 7 and the fuse are used together to provide double protection for the PTC heater 3, greatly reducing the possibility of burning of the PTC heater 3.

[0033] A mounting ring plate 51 is integrally formed on the inner circumferential wall of one end of the plastic ring 5 close to the water inlet end of the inner tube 1, and the heat-conducting ring 6 is fixedly welded to the mounting ring plate 51. A clearance groove 52 is provided on the inner wall of the mounting ring plate 51 for the heat-conducting block 61 to make way, and the clearance groove 52 runs through both sides of the mounting ring plate 51 in the thickness direction. An embedding groove 53 is provided on the plastic ring 5 for the temperature controller 7 to be embedded, and the embedding groove 53 runs through both sides of the plastic ring 5 in the thickness direction.

[0034] A mounting plate is integrally formed on the outer peripheral wall of the heat conducting ring 6 , a receiving groove 54 for receiving the mounting plate is provided on the inner wall of the plastic ring 5 , a U-shaped groove 64 for installing a fuse is provided on the mounting plate, and the fuse is fixed in the U-shaped groove 64 .

[0035] The mounting ring plate 51 is provided with a limiting hole 55 for the wires of the PTC heating element 3 to pass through. The limiting hole 55 is a waist-shaped hole, and two adjacent wires of two different adjacent PTC heating elements 3 pass through the same limiting hole 55. Thus, the wires of two adjacent PTC heating elements 3 are stably limited, the installation stability of multiple PTC heating elements 3 is improved, and a single PTC heating element 3 is not easy to fall out of the mounting groove 21.

[0036] A connecting plate 65 is also integrally formed on the outer peripheral wall of the heat-conducting ring 6. The connecting plate 65 and the heat-conducting block 61 are symmetrically located on both sides of the radial direction of the heat-conducting ring 6. A connecting hole 651 is provided on the connecting plate 65. A countersunk screw is passed through the connecting hole 651. The countersunk screw passes through the connecting hole 651 and is threadedly connected to the inner tube 1. A connecting groove 56 for accommodating the connecting plate 65 is provided on the inner wall of the mounting ring plate 51.

[0037] The outer peripheral wall of the heat conducting ring 6 is also integrally formed with a partition plate, and two partition plates are arranged at intervals along the circumference of the heat conducting ring 6, namely, partition plate 1 66 and partition plate 2 67. Two mounting plates are also arranged at intervals, namely, mounting plate 1 62 and mounting plate 2 63. The inner wall of the mounting ring plate 51 is provided with a partition groove 57 for accommodating the partition plate.

[0038] The heat conductive block 61, partition 1 66, mounting plate 1 62, connecting plate 65, mounting plate 2 63 and partition 2 67 are sequentially arranged between two adjacent limiting holes 55 to limit the wires of two adjacent PTC heaters 3, prevent the wires of the PTC heater 3 from passing through the wrong limiting holes 55, avoid crossing and disorder of the wires of the PTC heater 3, and improve the neatness of the wires of the PTC heater 3.

[0039] Two leads extend from the thermostat 7, one lead corresponds to one fuse, which is not shown in the figure.

[0040] One end of the shell of the PTC heater 3 in the length direction is flush with the side of the aluminum tube 2 in the length direction close to the water inlet end of the inner tube 1. A limiting plate 8 is fixedly connected to the inner wall of the plastic ring 5. The side of the limiting plate 8 away from the water inlet end of the inner tube 1 abuts against the shell of the PTC heater 3. The other end of the PTC heater 3 abuts against the inner bottom wall of the mounting groove 21. The shells of two adjacent different PTC heaters 3 abut against the same limiting plate 8. The limiting plate 8 is provided with an auxiliary hole 81 for the wires of the PTC heater 3 to pass through. The auxiliary hole 81 is a waist-shaped hole, and two adjacent wires of two adjacent different PTC heaters 3 pass through the same auxiliary hole 81. The limiting plate 8 limits the PTC heater 3 in the mounting groove 21, thereby improving the stability of the installation of the PTC heater 3.

[0041] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A constant temperature PTC pipe heater, characterized in that: It comprises an inner tube (1), a plurality of aluminum tubes (2) are arranged on the peripheral side wall of the inner tube (1), a mounting groove (21) is provided at one end of the aluminum tube (2) in the length direction, a PTC heating element (3) is installed in the mounting groove (21), an electrode is provided on the upper and lower sides of the PTC heating element (3), and the outer periphery of each PTC heating element (3) is wrapped with an insulating film, and the insulating film is in contact with the inner peripheral wall of the mounting groove (21); An outer tube (12) is arranged outside the inner tube (1), the aluminum tube (2) is arranged between the inner tube (1) and the outer tube (12), the outer wall of each aluminum tube (2) is tightly fitted with the inner wall of the outer tube (12), and the outer peripheral wall of the outer tube (12) is coated with thermal insulation cotton (4); The outer ring of the thermal insulation cotton (4) is provided with a plastic ring (5), the plastic ring (5) is arranged close to the water inlet end of the inner tube (1), a heat-conducting ring (6) is arranged inside the plastic ring (5), a thermostat (7) is arranged on the plastic ring (5), a heat-conducting block (61) is arranged on the outer peripheral wall of the heat-conducting ring (6), the heat-conducting block (61) is in contact with the temperature-sensing surface of the thermostat (7), and the thermostat (7) is used to control the heating temperature of the PTC heating element (3); The heat-conducting ring (6) is also provided with a fuse, which is connected in series with the temperature controller (7). When the temperature controller (7) fails, the fuse controls the heating temperature of the PTC heating element (3). When the heating temperature of the PTC heating element (3) continues to rise and exceeds the temperature of the fuse, the fuse disconnects and sends a disconnection signal to the control system so that the control system disconnects the circuit where the PTC heating element is located.

2. The constant temperature PTC pipe heater according to claim 1, characterized in that: A mounting ring plate (51) is integrally formed on the inner peripheral wall of one end of the plastic ring (5) close to the water inlet end of the inner tube (1); the heat-conducting ring (6) is fixedly connected to the mounting ring plate (51); a clearance groove (52) for the heat-conducting block (61) to make way is provided on the inner wall of the mounting ring plate (51); the clearance groove (52) penetrates both sides of the mounting ring plate (51) in the thickness direction; and an embedding groove (53) for embedding the temperature controller (7) is provided on the plastic ring (5); the embedding groove (53) penetrates both sides of the plastic ring (5) in the thickness direction.

3. The constant temperature PTC pipe heater according to claim 2, characterized in that: A mounting plate is also provided on the outer peripheral wall of the heat-conducting ring (6), a receiving groove (54) for receiving the mounting plate is provided on the inner wall of the plastic ring (5), a U-shaped groove (64) for installing a fuse is provided on the mounting plate, and the fuse is fixed in the U-shaped groove (64).

4. The constant temperature PTC pipe heater according to claim 3, characterized in that: The mounting ring plate (51) is provided with a limiting hole (55) for the wire of the PTC heating element (3) to pass through.

5. The constant temperature PTC pipe heater according to claim 4, characterized in that: The limiting hole (55) is a waist-shaped hole, and two adjacent wires of two adjacent different PTC heating elements (3) pass through the same limiting hole (55).

6. The constant temperature PTC pipe heater according to claim 4, characterized in that: A connecting plate (65) is also provided on the outer peripheral wall of the heat-conducting ring (6). The connecting plate (65) and the heat-conducting block (61) are symmetrically located on both sides of the heat-conducting ring (6) in a radial direction. A connecting hole (651) is provided on the connecting plate (65). A countersunk screw is inserted into the connecting hole (651). The countersunk screw passes through the connecting hole (651) and is threadedly connected to the inner tube (1).

7. The constant temperature PTC pipe heater according to claim 6, characterized in that: The outer peripheral wall of the heat-conducting ring (6) is also provided with a partition plate, and two of the partition plates are arranged at intervals along the circumference of the heat-conducting ring (6) and are partition plate 1 (66) and partition plate 2 (67), respectively. The mounting plates are also arranged at intervals with two of them and are mounting plate 1 (62) and mounting plate 2 (63), respectively. The heat conducting block (61), the first partition plate (66), the first mounting plate (62), the connecting plate (65), the second mounting plate (63), and the second partition plate (67) are sequentially arranged between two adjacent limiting holes (55).

8. The constant temperature PTC pipe heater according to claim 1, characterized in that: One end of the shell of the PTC heating element (3) in the length direction is flush with a side of the aluminum tube (2) in the length direction close to the water inlet end of the inner tube (1); a limiting plate (8) is fixedly connected to the inner wall of the plastic ring (5); a side of the limiting plate (8) away from the water inlet end of the inner tube (1) abuts against the shell of the PTC heating element (3); the other end of the PTC heating element abuts against the inner bottom wall of the mounting groove (21); the shells of two adjacent different PTC heating elements (3) abut against the same limiting plate (8); and an auxiliary hole (81) is provided on the limiting plate (8) for the wire of the PTC heating element (3) to pass through.

9. The constant temperature PTC pipe heater according to claim 8, characterized in that: The auxiliary hole (81) is a waist-shaped hole, and two adjacent wires of two adjacent different PTC heating elements (3) pass through the same auxiliary hole (81).

10. The constant temperature PTC pipe heater according to claim 1, characterized in that: The inner tube (1) and the aluminum tube (2) are interference-fitted by means of an expansion tube process.

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