Thick film heating body

Abstract

A thick film heating body comprises a body, an insulating layer, a thick film heating wire and a first live wire access point, wherein the first live wire access point is laid on the insulating layer and is a 900w live wire access point; the second live wire access point is laid on the insulating layer and is a 1200w live wire access point; a plurality of thick film heating wires are connected between the first live wire access point and the null line access point; a plurality of thick film heating wires are connected between the second live wire access point and the zero wire access point to form a first heating area and a second heating area which are partitioned; the whole heating module is divided into three areas, wherein the top is a temperature detection area which is mainly used for detecting the outlet water temperature and the film temperature; the middle part is a first heating area; and the middle heating area and the lower heating area can be controlled separately, so that the whole machine can be heated by adjusting different powers.

Description

Technical Field

[0002] The utility model relates to the technical field of electric heating in drinking water and water supply equipment, and particularly to the thick film heating control technology for rapid heating and precise control of drinking water equipment.

Background Art

[0004] The structure of the so-called thick film heating element mainly includes a stainless steel layer, an inner insulating dielectric layer, a resistive heating layer, and an outer insulating dielectric layer from the inside to the outside. The heat conduction distance from the resistive heating layer to the stainless steel layer is short and the thermal resistance is small. Therefore, the thick film heating element has the advantages of small thermal resistance and fast thermal response speed due to its structural characteristics.

[0005] In the application of thick film heating elements, it is often necessary to monitor and control the temperature of the heating element in real time. Generally, existing technical means are to set a temperature sensing material that fits the surface of the heating element outside the heating element, and cooperate with a protection switch and a circuit board to control the temperature of the heating element. Once the safe temperature range is exceeded, it will be disconnected and the working state will be cut off for regulation.

[0006] Chinese Utility Model Patent CN206908876U discloses a thick film heating element for rapid real-time temperature measurement, including a stainless steel heating body, a heating circuit printed on the stainless steel heating body, and a temperature sensing material and conductor lines at both ends of the temperature sensing material printed on the stainless steel heating body. The temperature sensing material is printed on the part of the stainless steel heating body that needs to sense temperature. Since the temperature sensing material is directly printed on the stainless steel heating body in the present utility model, the temperature data of the stainless steel body can be obtained in real time, reducing the lag of temperature data signal transmission. At the same time, by setting the wiring terminals of the conductor lines at both ends of the temperature sensing material in the low-temperature part of the stainless steel heating body, the problem of solder joint detachment caused by too high temperature during use of the wiring terminals is solved.

[0007] Although the above patent solves problems such as poor contact between the temperature sensing material and the surface of the heating element, resulting in slow response, in the entire heat transfer system, since the power of the thick film heating wire is constant, it is impossible to adjust the heating of the whole machine with different powers. Secondly, if the heating element is scaled, the heat of the film temperature of the heating element will directly be collected and transferred to the position of the NTC through the heating element. Since the NTC position is relatively far from the heating film, the water temperature detection is affected and the outlet water temperature cannot be accurately controlled.

Summary of the Invention

[0009] Aiming at the problems existing in the prior art, the utility model provides a thick film heating element with an improved structure, which ensures the accuracy of water temperature detection and accurately controls the outlet water temperature. The heating element is designed with zoning as a whole, and different heating effects are generated by combining the parallel effects of different zones. At the same time, zoning settings and controls are carried out to achieve the effect of overall adjustment of different heating powers.

[0010] A thick film heating element related to the present utility model is designed to set the entire heating module into three regions: the top is the temperature detection region, mainly used for detecting the water outlet temperature and the film temperature; the middle is the first heating region; the lower part is the second heating region. The heating regions in the middle and lower parts can be controlled separately to achieve different power heating adjustments for the whole machine.

[0011] The thick film heating element includes a body, an insulating layer, and thick film heating wires, and is characterized in that

[0012] Body: Made of stainless steel material;

[0013] Insulating layer: The insulating layer covers the body, and the covering area is smaller than the area of the body;

[0014] The first live wire access point: Laid on the insulating layer as the 900w live wire access point;

[0015] The second live wire access point: Laid on the insulating layer as the 1200w live wire access point;

[0016] Neutral wire access point: Connected to the neutral wire;

[0017] Thick film heating wires: A number of thick film heating wires are connected between the first live wire access point and the neutral wire access point; a number of thick film heating wires are connected between the second live wire access point and the neutral wire access point, forming the first heating region and the second heating region with partitions;

[0018] Temperature detection region: A concave notch region without thick film heating wires is left in the center of the top of the first heating region or the second heating region. The region outside the notch region and connected to the notch region forms the temperature detection region. A film temperature detection module and a water outlet temperature detection module are provided in the temperature detection region.

[0019] The first live wire, the second live wire, and the neutral wire in the first heating region and the second heating region are spirally arranged within the region, dividing the first heating region and the second heating region into several parallel heating working regions.

[0020] The film temperature detection module includes a film temperature detection site, a film temperature thermometer, a film temperature thermometer access point, and a thermometer common access point. Among them, the film temperature detection site is separately designed in the notch region. The film temperature detection site is connected to the film temperature thermometer access point and the thermometer common access point through a wire. The film temperature thermometer is arranged at the film temperature detection point. The film temperature thermometer access point and the thermometer common access point are arranged in the temperature detection region outside the notch region.

[0021] The film temperature thermometer includes, but is not limited to, an infrared thermometer, an NTC thermometer, and a thermocouple thermometer.

[0022] The water outlet temperature detection module includes a water outlet temperature detection site, a water temperature thermometer, a water temperature thermometer access point, and a thermometer common access point. The water outlet temperature detection site is located in the vertical direction of the film temperature detection site, in the temperature detection area outside the notch area. The water temperature thermometer is arranged at the water outlet temperature detection site. The water outlet temperature detection site is connected to the water temperature thermometer access point and the thermometer common access point through a wire. The water temperature thermometer access point is arranged in the temperature detection area outside the notch area.

[0023] The water temperature thermometer includes, but is not limited to, an infrared thermometer, an NTC thermometer, and a thermocouple thermometer.

[0024] The film temperature thermometer is arranged in the notch area without the thick film heating wire. Three of the four directions of the notch area in the up, down, left, and right directions are covered by the thick film heating wire, and the distance between the film temperature thermometer and the thick film heating wire coverage area is ≥2 mm.

[0025] The distance between the water temperature thermometer and the thick film heating wire coverage area is ≥4 mm.

[0026] A thick film heating body involved in the present utility model sets the entire heating module into three areas in the design: the top is the temperature detection area, mainly used for detecting the water outlet temperature and the film temperature; the middle is the first heating area; the lower part is the second heating area. The heating areas in the middle and lower parts can be controlled separately to realize the whole machine to adjust the heating of different powers. And if a certain heating area is damaged, it does not affect the normal operation of other areas.

[0027] A thick film heating body involved in the present utility model sets the entire heating module into three different areas, which respectively undertake the functions of detection and heat generation differentiation, and sets multiple live wires. The live wires are coiled and arranged, and thick film heating wires are arranged between the coiled live wires and the neutral wire, so that the heating areas are divided into independent working areas, and they are in a parallel relationship with each other. If one area is damaged, it does not affect the heating operation of other independent areas. It not only realizes adjustable power but also allows multiple areas to work relatively independently.

Description of the Drawings

[0029] Figure 1 is a schematic structural diagram of a thick film heating body involved in the present utility model;

[0030] Figure 2 is a partial enlarged structural diagram of a thick film heating body involved in the present utility model;

[0031] Wherein: 10, body; 20, insulating layer; 30, thick film heating wire; 41, first live wire access point; 42, second live wire access point; 43, neutral wire access point; 51, film temperature detection site; 52, film temperature thermometer access point; 60, thermometer common access point; 71, outlet water temperature detection site; 72, water temperature thermometer access point;

[0032] 100, first heating zone; 200, second heating zone; 300, temperature detection zone; 400, notch area.

Detailed implementation manners

[0034] The present utility model will be described in detail below with reference to the drawings and embodiments. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0035] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0036] Please refer to the attached Figure 1 , a thick film heating body is designed to set the entire heating module into three zones: the top is the temperature detection zone, mainly used for detecting the outlet water temperature and the film temperature; the middle is the first heating zone; the lower part is the second heating zone. The heating zones in the middle and the lower part can be controlled separately to achieve the whole machine to adjust the heating with different powers.

[0037] From the attached Figure 1 shown, the thick film heating body includes a body 10, an insulating layer 20 and a thick film heating wire 30. The body 10: is made of stainless steel material and serves as the overall substrate to carry the insulating layer 20 and the thick film heating wire 30 above.

[0038] Insulating layer 20: The insulating layer 20 covers the body 10, and the covering area is smaller than the area of the body 10;

[0039] First live wire access point 41: Laid on the insulating layer as the 900w live wire access point;

[0040] Second live wire access point 42: Laid on the insulating layer as the 1200w live wire access point;

[0041] Neutral wire connection point 43: Connect the neutral wire;

[0042] Thick film heating wire 30: A number of thick film heating wires are connected between the first live wire connection point and the neutral wire connection point; a number of thick film heating wires are connected between the second live wire connection point and the neutral wire connection point, forming a partitioned first heating zone 100 and second heating zone 200;

[0043] After connecting the first live wire connection point 41 with 900w and the neutral wire connection point 43, the first heating zone 100 starts to work and heat up.

[0044] After connecting the second live wire connection point 42 with 1200w and the neutral wire connection point 43, the second heating zone 200 starts to work and heat up.

[0045] After connecting the first live wire connection point 41 with 900w, the second live wire connection point 42 and the neutral wire connection point 43, the first heating zone 100 and the second heating zone 200 start to work simultaneously. The partitioned operation and different power adjustment of the thick film heating body are realized.

[0046] The first live wire, the second live wire and the neutral wire in the first heating zone 100 and the second heating zone 200 are spirally arranged within the zones, dividing the first heating zone 100 and the second heating zone 200 into several parallel heating working zones. As shown in the attached Figure 1 In the circuit wiring shown, it can be seen that the first heating zone 100 can be divided into two independent heating working zones, and the second heating zone 200 can also be correspondingly divided into two independent heating working zones. Different wiring methods can be designed according to actual needs. Through the coiled wiring method, the heating zone can be divided into different independent working zones. If the thick film heating body in a certain independent working zone is damaged, it will not affect the work of other zones, and a relatively independent working process can be realized.

[0047] Please refer to the attached Figure 2 , which shows a partial enlarged view of a thick film heating body, mainly showing the temperature detection zone 300. The temperature detection zone 300: A notch area 400 without thick film heating wires is left empty in the center of the top of the first heating zone 100 or the second heating zone 200. In this specific embodiment, a sunken notch area 400 is left empty in the center of the top of the first heating zone 100, and then the peripheral area of the combined part is connected as a whole to form the temperature detection zone 300.

[0048] That is, outside the notch area 400 and connected to the notch area 300 to form the temperature detection zone 400. A film temperature detection module and an outlet water temperature detection module are provided in the temperature detection zone 400.

[0049] The membrane temperature detection module includes a membrane temperature detection site 51, a membrane temperature thermometer, a membrane temperature thermometer access point 52, and a thermometer common access point 60. The membrane temperature detection site is separately designed in the notch area 400. The membrane temperature detection site 51 is connected to the membrane temperature thermometer access point 52 and the thermometer common access point 60 through a wire. The membrane temperature thermometer is arranged at the membrane temperature detection point, and the membrane temperature thermometer access point and the thermometer common access point are arranged in the temperature detection area outside the notch area.

[0050] The membrane temperature thermometer includes, but is not limited to, an infrared thermometer, an NTC thermometer, and a thermocouple thermometer.

[0051] The outlet water temperature detection module includes an outlet water temperature detection site 71, a water temperature thermometer, a water temperature thermometer access point 72, and a thermometer common access point 60. The outlet water temperature detection site 71 is located in the vertical direction of the membrane temperature detection site. Whether it is the outlet water temperature detection site 71 or the membrane temperature detection site 72 arranged thereon, a thermometer needs to be fixed at this position by using the chip technology. For the convenience of processing, they are arranged on the same vertical straight line, optimizing the chip processing technological process.

[0052] In the temperature detection area 300 outside the notch area 400, the water temperature thermometer is arranged at the outlet water temperature detection site 71. The outlet water temperature detection site 71 is connected to the water temperature thermometer access point 72 and the thermometer common access point 60 through a wire. The water temperature thermometer access point is arranged in the temperature detection area outside the notch area.

[0053] The water temperature thermometer includes, but is not limited to, an infrared thermometer, an NTC thermometer, and a thermocouple thermometer.

[0054] The membrane temperature thermometer is arranged in the notch area without thick film heating wires. Three of the four directions of up, down, left, and right in this notch area are covered by thick film heating wires, and the distance between the membrane temperature thermometer and the thick film heating wire coverage area is ≥2 mm.

[0055] The distance between the water temperature thermometer and the thick film heating wire coverage area is ≥4 mm.

[0056] In this embodiment, the film temperature thermometer is a film temperature NTC, and the film temperature NTC is arranged in the middle of the thick film heating wire. At least two sides of the four directions of up, down, left and right are covered by the thick film heating wire, and preferably three sides are covered by the thick film heating wire. The distance between the edge of the film temperature NTC and the coverage range of the heating wire is ≥2 mm (mainly to prevent the electric field of the heating film from affecting the weak circuit of the NTC). In addition, in the prior art, the NTC is arranged in the water path. Due to the presence of the NTC, the local flow field is extremely complex, resulting in different flow fields and flow velocities, causing serious local scaling, resulting in a change in the NTC detection time (due to the additional thermal resistance of the water scale in the heat exchange between the water and the NTC crystal nucleus, resulting in slow heat transfer), and the whole machine goes out of control when hot water comes out. Therefore, the outlet water thermometer is arranged on the heating body. In this way, as long as the temperature detected by the NTC does not exceed the limit, the water temperature in the heating body will not exceed the limit additionally; and it will not interfere with the flow field inside the heating body. In addition, in order to reduce the influence of the thick film heating wire on the outlet water NTC, it is designed that the distance between the outlet water NTC and the heating film is ≥4 mm.

[0057] A thick film heating body of the present invention divides the entire heating module into three different regions, which respectively undertake the functions of detection and differentiation of heat generation, and a plurality of live wires are provided. The live wires are arranged in a coil, and thick film heating wires are arranged between the coiled live wires and the neutral wire, so that the heating regions are divided into independent working regions, and are in a parallel relationship with each other. The damage of one region does not affect the heating work of other independent regions, which not only realizes adjustable power but also allows multiple regions to work relatively independently.

[0058] The above are only preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art, within the scope of the technical solution of the present invention, when making some changes or modifications using the above-disclosed technical content as equivalent variations of equivalent embodiments, but as long as it does not depart from the technical solution content of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical meaning of the present invention shall fall within the scope of the technical solution of the present invention.

Claims

1. A thick film heater, comprising a body, an insulating layer and a thick film heater wire, characterized in that: Body: Made of stainless steel; Insulation layer: The insulation layer covers the main body, and the coverage area is smaller than the main body area; The first live wire access point: laid on the insulation layer is a 900w live wire access point; The second live wire access point: laid on the insulation layer is a 1200w live wire access point; Neutral line access point: connect to the neutral line; Thick film heating wire: a plurality of thick film heating wires are connected between the first live wire access point and the neutral wire access point; a plurality of thick film heating wires are connected between the second live wire access point and the neutral wire access point, forming a first heating zone and a second heating zone; Temperature detection zone: a notch area without thick film heating wire is left in the center of the top of the first heating zone or the second heating zone, and the notch area is connected to the notch area to form a temperature detection zone, in which a film temperature detection module and a water outlet temperature detection module are provided.

2. The thick film heater according to claim 1, characterized in that: The first live wire, the second live wire and the neutral wire in the first heating zone and the second heating zone are arranged in a spiral manner in the area, dividing the first heating zone and the second heating zone into a plurality of parallel heating working zones.

3. The thick film heater according to claim 1, characterized in that: The film temperature detection module includes a film temperature detection site, a film temperature thermometer, a film temperature thermometer access point and a thermometer common access point, wherein the film temperature detection site is individually designed in the notch area, the film temperature detection site is connected to the film temperature thermometer access point and the thermometer common access point through a wire, the film temperature thermometer is arranged on the film temperature detection point, and the film temperature thermometer access point and the thermometer common access point are arranged in the temperature detection area outside the notch area.

4. The thick film heater according to claim 2, characterized in that: The film temperature thermometer includes but is not limited to an infrared thermometer, an NTC thermometer, and a thermocouple thermometer.

5. The thick film heater according to claim 1, characterized in that: The outlet water temperature detection module includes an outlet water temperature detection site, a water temperature thermometer, a water temperature thermometer access point and a thermometer common access point. The outlet water temperature detection site is located in the vertical direction of the membrane temperature detection site, in the temperature detection area outside the notch area. The water temperature thermometer is set on the outlet water temperature detection site. The outlet water temperature detection site is connected to the water temperature thermometer access point and the thermometer common access point through a wire. The water temperature thermometer access point is set in the temperature detection area outside the notch area.

6. The thick film heater according to claim 5, characterized in that: The water temperature thermometer includes but is not limited to an infrared thermometer, an NTC thermometer and a thermocouple thermometer.

7. The thick film heater according to claim 3, characterized in that: The film temperature thermometer is arranged in a notch area without thick film heating wires, and three of the four directions of the notch area, namely, up, down, left, and right, are covered by thick film heating wires, and the distance between the film temperature thermometer and the area covered by the thick film heating wires is ≥2mm.

8. The thick film heater according to claim 5, characterized in that: The distance between the water temperature thermometer and the area covered by the thick film heating wire is ≥4mm.

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