Small PTC heater and water heater

Abstract

The present invention discloses a small PTC heater, comprising a metal inner tube, a PTC heating assembly is arranged on the outer wall of the metal inner tube, the PTC heating assembly comprises an inner conductive metal seat, an outer conductive metal seat and a PTC heating element group, the PTC heating element group surrounds the inner conductive metal seat, an insulating layer is coated on the outer side of the outer conductive metal seat, the metal inner tube is insulated from the inner conductive metal seat, a gap or insulation is left between the inner conductive metal seat, the outer conductive metal seat and the PTC heating element, and conductive columns connected and conducted are respectively arranged on the inner conductive metal seat and the outer conductive metal seat, so that the inner conductive metal seat and the outer conductive metal seat act as electrode plates. The present invention also discloses a water heater. Compared with the prior art, it can not only make the heating more uniform, but also is easy to assemble, and under the same heating power, the heating effect is better, the energy consumption is low, and the safety is high due to the use of PTC heating elements.

Description

Technical Field

[0001] The invention relates to a heating device, in particular to a small PTC heater and a water heater. Background Art

[0002] At present, the existing heating rods generally use electric heating wires as heating elements, and magnesium oxide powder with thermal conductivity is added to the tube body to fill the space between the tube body and the electric heating wire. Since the position of the electric heating wire in the tube body is difficult to determine, temperature differences are likely to occur on the heating rod, that is, the heat at different positions of the tube body is also different, resulting in uneven heating effect and poor heating effect. During use, the electric heating wire cannot be dry-burned. Therefore, it is necessary to always ensure that the water level in the water tank or the liquid heater can fully or partially immerse the heating rod; if there is insufficient water supply, there is a risk of the heating rod bursting, which is not only easy to cause a fire, but also endangers personal safety. The existing PTC heater is generally a strip plate structure, which needs to be coated with an insulating film outside the electrode plate and then installed and fixed to the heating rod shell. This structure is not only complicated, but also has the problem of low thermal efficiency. Summary of the invention

[0003] The purpose of the present invention is to provide a small PTC heater and a water heater, and the technical problem to be solved is to improve the heating effect of liquid, reduce energy consumption and facilitate assembly.

[0004] To solve the above problems, the present invention adopts the following technical solutions: a small PTC heater, comprising a metal inner tube, a PTC heating assembly is arranged on the outer wall of the metal inner tube, the PTC heating assembly comprises an inner conductive metal seat sleeved on the outside of the metal inner tube, an outer conductive metal seat arranged outside the inner conductive metal seat, and a PTC heating element group arranged between the inner conductive metal seat and the outer conductive metal seat, the PTC heating element group is in contact with the inner conductive metal seat and the outer conductive metal seat, the PTC heating element group surrounds the inner conductive metal seat, each group of PTC heating element groups is provided with a plurality of PTC heating elements, the PTC heating elements are arranged in a straight line along the axial direction of the metal inner tube, an insulating layer is coated on the outer side of the outer conductive metal seat, the metal inner tube is insulated from the inner conductive metal seat, a gap or insulation is left between the inner conductive metal seat, the outer conductive metal seat and the PTC heating element group, and conductive columns connected and conductive are respectively provided on the inner conductive metal seat and the outer conductive metal seat, so that the inner conductive metal seat and the outer conductive metal seat act as electrode plates.

[0005] Furthermore, a circle of first PTC heating element contact parts are provided on the surface of one end opposite to the outer conductive metal seat, and the number of the first PTC heating element contact parts is equal to the number of the PTC heating element groups, so that the electrode coating of each PTC heating element in the PTC heating element group is completely in contact with the first PTC heating element contact parts; a through hole for the metal inner tube to pass through is provided at the center of the inner conductive metal seat.

[0006] Further, the cross-sectional shape of the inner conductive metal seat is a regular polygon, and the first PTC heating element contact portion is formed by each outer surface of the inner conductive metal seat.

[0007] Furthermore, the cross-section of the inner conductive metal seat is a regular polygon, a groove is provided on the inner conductive metal seat at the first PTC heating element contact portion, and the first PTC heating element contact portion is formed by the groove wall opposite to the outer conductive metal seat.

[0008] Furthermore, the outer conductive metal seat is a cylinder with a ring-shaped cross-section, and a second PTC heating element contact portion is arranged on the inner wall of the outer conductive metal seat to achieve contact and conduction with the electrode coating of the PTC heating element, and the number of the second PTC heating element contact portions is the same as the number of the PTC heating element groups.

[0009] Furthermore, the outer conductive metal seat comprises arc-shaped sheets and a metal outer tube, the number of which is equal to the number of the PTC heating element groups. When the arc-shaped sheets are combined, a cylinder with a circular cross-section is formed. A second PTC heating element contact portion is provided on the surface of the end of the arc-shaped sheet opposite to the PTC heating element group. The second PTC heating element contact portion is in complete contact with the electrode coating of each PTC heating element in the PTC heating element group. The metal outer tube is sleeved over the outer conductive metal seat and makes the metal outer tube contact with the surface of each arc-shaped sheet to form conduction. A gap or insulation is provided between the arc-shaped sheet, the PTC heating element group and the inner conductive metal seat, and the insulating layer is coated on the outside of the metal outer tube.

[0010] Furthermore, an insulating protective layer is filled between the metal inner tube and the inner conductive metal seat.

[0011] Furthermore, the insulating protective layer is insulating paper or insulating filler.

[0012] Furthermore, the insulating filler is magnesium oxide filler.

[0013] The invention also discloses a water heater, comprising the small PTC heater.

[0014] Compared with the prior art, the present invention arranges an inner conductive metal seat and an outer conductive metal seat as electrode plates outside the metal inner tube, arranges the PTC heating element group in a ring around the inner conductive metal seat and the outer conductive metal seat, and then insulates the inner conductive metal seat and the metal inner tube, as well as insulates the outer conductive metal seat, thereby simplifying the structure, and the inner and outer conductive fixing seats are also used to clamp and fix the PTC heating element group, and the inner conductive fixing seat is sleeved outside the metal inner tube, which not only makes the heating more uniform; but also facilitates assembly. Under the same heating power, the heating effect is better and the energy consumption is low. Since the PTC heating element is used, it has high safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of embodiment 1 of the present invention.

[0016] Figure 2 It is a schematic diagram of the internal structure of Example 1 of the present invention.

[0017] Figure 3 It is a structural diagram of embodiment 2 of the present invention.

[0018] Figure 4 The internal structure of the second embodiment of the present invention is shown in FIG. Figure 1 .

[0019] Figure 5 The internal structure of the second embodiment of the present invention is shown in FIG. Figure 2 .

[0020] Figure 6 It is a schematic structural diagram of the conductive metal seat in the present invention. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0022] Embodiment 1:

[0023] like Figure 1 and Figure 2As shown, the present invention discloses a small PTC heater, comprising a metal inner tube 1, a PTC heating assembly 2 is arranged on the outer wall of the metal inner tube 1, the PTC heating assembly 2 comprises an inner conductive metal seat 3 sleeved outside the metal inner tube 1, an outer conductive metal seat 4 arranged outside the inner conductive metal seat 3, and a PTC heating element group 5 arranged between the inner conductive metal seat 3 and the outer conductive metal seat 4, the PTC heating element group 5 is in contact with the inner conductive metal seat 3 and the outer conductive metal seat 4, the PTC heating element group 5 surrounds the inner conductive metal seat 3, and each group of PTC heating element groups 5 is provided with a plurality of PTC heating elements. Element, the PTC heating element is arranged in a straight line along the axial direction of the metal inner tube 1, an insulating layer 6 is coated on the outer conductive metal seat 4, the metal inner tube 1 and the inner conductive metal seat 3 are insulated, and a gap or insulation is left between the inner conductive metal seat 3, the outer conductive metal seat 4 and the PTC heating element group 5 to achieve mutual insulation, and conductive columns 7 connected to the inner conductive metal seat 3 and the outer conductive metal seat 4 are respectively provided on the inner conductive metal seat 3 and the outer conductive metal seat 4, so that the inner conductive metal seat 3 and the outer conductive metal seat 4 act as electrode plates, and together with the PTC heating element group 5 constitute a PTC heating assembly 2.

[0024] The present invention uses the inner conductive metal seat 3 and the outer conductive metal seat 4 as electrode plates, which saves components and reduces costs and assembly difficulty.

[0025] During assembly, the metal inner tube 1 and the inner conductive metal seat 3 are insulated first, and then the PTC heating element group 5 is placed on the inner conductive metal seat 3, and then the outer conductive metal seat 4 is assembled. After that, the conductive column 7 is electrically connected to the inner conductive metal seat 3 and the outer conductive metal seat 4 respectively, and finally the outer conductive metal seat 4 is covered with an insulating layer 6 to complete the assembly.

[0026] In the present invention, grooves are provided on the inner conductive metal seat 3 and the outer conductive metal seat 4, and the conductive pillars 7 are inserted into the grooves.

[0027] like Figure 2 As shown, in Example 1, the outer conductive metal seat 4 can be a cylinder with a ring-shaped cross-section, and a second PTC heating element contact portion 42 is provided on the inner wall of the outer conductive metal seat 4 to achieve contact and conduction with the electrode coating of the PTC heating element, and the number of the second PTC heating element contact portions 42 is the same as the number of the PTC heating element groups 5, and the second PTC heating element contact portions 42 are contact planes.

[0028] like Figure 2 and Figure 6As shown, a circle of first PTC heating element contact parts 31 are provided on the surface of one end opposite to the outer conductive metal seat 4, and the number of the first PTC heating element contact parts 31 is equal to the number of the PTC heating element groups 5, so that the electrode coating of each PTC heating element in the PTC heating element group 5 is completely in contact with the first PTC heating element contact parts 31; the first PTC heating element contact parts 31 are opposite to the second PTC heating element contact parts 41 one by one; a through hole 32 for the metal inner tube 1 to pass through is provided at the center of the inner conductive metal seat 3, and the metal inner tube 1 passes through the through hole 32.

[0029] like Figure 2 As shown, the cross-sectional shape of the inner conductive metal seat 3 is a regular polygon, and the first PTC heating element contact portion 31 is formed by each outer surface of the inner conductive metal seat 3. Of course, a groove 33 is provided on the inner conductive metal seat 3 at the first PTC heating element contact portion 31, and the first PTC heating element contact portion 31 is formed by the groove 33 and the groove wall opposite to the outer conductive metal seat 4, so as to fix the PTC heating element group 5.

[0030] like Figure 2 As shown, an insulating protective layer 9 is filled between the metal inner tube 1 and the inner conductive metal seat 3. The insulating protective layer 9 is insulating paper or insulating filler. When it is an insulating filler, the insulating filler is magnesium oxide filler.

[0031] Embodiment 2:

[0032] like Figure 3 and Figure 4 As shown, on the basis of Example 1, another conduction mode is realized by changing the structure of the outer conductive metal seat 4, and its structure is as follows: the outer conductive metal seat 4 includes arc-shaped sheets 41 and a metal outer tube 8 equal in number to the PTC heating element group 5, when the arc-shaped sheets 41 are combined to form a cylinder with a circular cross-section, the second PTC heating element contact portion 42 is arranged on the end surface of the arc-shaped sheet 41 opposite to the PTC heating element group 5, the second PTC heating element contact portion 42 is completely in contact with the electrode coating of each PTC heating element in the PTC heating element group 5, the metal outer tube 8 is sleeved outside the outer conductive metal seat 4 and makes the metal outer tube 8 contact with the surface of each arc-shaped sheet 41 to form conduction; gaps or insulation are provided between the arc-shaped sheet 41, the inner conductive metal seat 3 and the PTC heating element group; the conductive column 7 is connected to one of the arc-shaped sheets 41, and all the arc-shaped sheets 41 are connected and conducted through the metal outer tube 8; the insulating layer 6 is coated on the outside of the metal outer tube 8 to meet the insulation requirements.

[0033] like Figure 5As shown, the present invention also discloses a water heater, including the above-mentioned small PTC heater, liquid flows through the metal inner tube 1, and after the PTC heating component 5 generates heat, the heat is conducted to the metal inner tube 1 through the inner conductive metal seat, thereby heating the liquid in the metal inner tube 1.

[0034] The present invention arranges an inner conductive metal seat and an outer conductive metal seat as electrode plates outside the metal inner tube, arranges the PTC heating element group in a ring around the inner conductive metal seat and the outer conductive metal seat, and then insulates the inner conductive metal seat and the metal inner tube, as well as the outer conductive metal seat, thereby simplifying the structure, and the inner and outer conductive fixing seats are also used to clamp and fix the PTC heating element group. The inner conductive fixing seat is sleeved outside the metal inner tube, which not only makes the heating more uniform; but also facilitates assembly. Under the same heating power, the heating effect is better and the energy consumption is low. Since the PTC heating element is used, the safety is high.

Claims

1. A small PTC heater, comprising a metal inner tube (1), the outer wall of which is provided with The PTC heating component (2) is characterized by: The PTC heating assembly (2) comprises an inner conductive metal seat (3) sleeved on the outside of the metal inner tube (1), an outer conductive metal seat (4) arranged outside the inner conductive metal seat (3), and a PTC heating element group (5) arranged between the inner conductive metal seat (3) and the outer conductive metal seat (4); the PTC heating element group (5) is in contact with the inner conductive metal seat (3) and the outer conductive metal seat (4); the PTC heating element group (5) surrounds the inner conductive metal seat (3) for a circle; each group of PTC heating element groups (5) is provided with a plurality of PTC heating elements. The PTC heating element is arranged in a straight line along the axial direction of a metal inner tube (1), an insulating layer (6) is coated on the outer side of an outer conductive metal seat (4), the metal inner tube (1) and the inner conductive metal seat (3) are insulated, a gap or insulation is left between the inner conductive metal seat (3), the outer conductive metal seat (4) and the PTC heating element group (5), and conductive columns (7) connected and conducting to the inner conductive metal seat (3) and the outer conductive metal seat (4) are respectively provided on the inner conductive metal seat (3) and the outer conductive metal seat (4), so that the inner conductive metal seat (3) and the outer conductive metal seat (4) act as electrode plates.

2. The small PTC heater according to claim 1, characterized in that: A circle of first PTC heating element contact parts (31) are provided on the surface of one end of the inner conductive metal seat (3) opposite to the outer conductive metal seat (4), and the number of the first PTC heating element contact parts (31) is equal to the number of the PTC heating element groups (5), so that the electrode coating of each PTC heating element in the PTC heating element group (5) is completely in contact with the first PTC heating element contact parts (31); and a through hole (32) for the metal inner tube (1) to pass through is provided at the center of the inner conductive metal seat (3).

3. The small PTC heater according to claim 2, characterized in that: The cross-sectional shape of the inner conductive metal seat (3) is a regular polygon, and the first PTC heating element contact portion (31) is formed by each outer surface of the inner conductive metal seat (3).

4. The small PTC heater according to claim 2, characterized in that: The cross-sectional shape of the inner conductive metal seat (3) is a regular polygon, and a groove (33) is provided on the inner conductive metal seat (3) at the first PTC heating element contact portion (31), and the first PTC heating element contact portion (31) is formed by the groove (33) and the groove wall opposite to the outer conductive metal seat (4).

5. The small PTC heater according to claim 3 or 4, characterized in that: The outer conductive metal seat (4) is a cylinder with a circular cross section. A second PTC heating element contact portion (42) is provided on the inner wall of the outer conductive metal seat (4) so ​​as to achieve contact and conduction with the electrode coating of the PTC heating element. The number of the second PTC heating element contact portions (42) is the same as the number of the PTC heating element groups (5).

6. The small PTC heater according to claim 3 or 4, characterized in that: The outer conductive metal seat (4) comprises an arc-shaped sheet (41) and a metal outer tube (8) equal in number to the number of the PTC heating element group (5). When the arc-shaped sheets (41) are combined, a cylinder with a circular cross-section is formed. A second PTC heating element contact portion (42) is provided on the surface of the end of the arc-shaped sheet (41) opposite to the PTC heating element group (5). The second PTC heating element contact portion (42) is in complete contact with the electrode coating of each PTC heating element in the PTC heating element group (5). The metal outer tube (8) is sleeved outside the outer conductive metal seat (4) and makes the metal outer tube (8) contact with the surface of each arc-shaped sheet (41) to form conduction. A gap or insulation is provided between the arc-shaped sheet (41), the PTC heating element group (5) and the inner conductive metal seat (3). The insulating layer (6) is coated outside the metal outer tube (8).

7. The small PTC heater according to claim 1, characterized in that: An insulating protective layer (9) is filled between the metal inner tube (1) and the inner conductive metal seat (3).

8. The small PTC heater according to claim 7, characterized in that: The insulating protective layer (9) is insulating paper or insulating filler.

9. The small PTC heater according to claim 8, characterized in that: The insulating filler is magnesium oxide filler.

10. A water heater, characterized in that: It comprises a small PTC heater as described in any one of claims 1 to 9.

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