Scale-resistant thick film heating pipe, thick film heating assembly comprising heating pipe and heater

Abstract

The invention relates to the field of thick film heating for hard water, in particular to a scale-resistant thick film heating pipe, a thick film heating assembly comprising the heating pipe and a heater, the scale-resistant thick film heating pipe comprises a pipe body and a thick film heating layer, the thick film heating layer is arranged on the outer surface of the pipe body, and the inner diameter of the pipe body is 34-93 mm. The thick film heating device comprises the scale-resistant thick film heating pipe enabling scale to fall off in a powdery mode, the thick film heating assembly achieving scale inhibition and scale discharging based on the scale-resistant thick film heating pipe and the water heater using the thick film heating assembly to complete hard water heating, the influence of the scale on thick film heating operation can be effectively reduced, and the heat conductivity of thick film heating is improved.

Description

Technical Field

[0001] The invention relates to the field of thick film heating for hard water, in particular to a scale-resistant thick film heating tube for hard water and a thick film heating component and a heater containing the heating tube. Background Art

[0002] Hard water refers to water containing high levels of calcium and magnesium ions, such as tap water, reservoir water, river water, groundwater, and other impure water. When heated, the calcium and magnesium ions form basic carbonates, which precipitate and adhere to the inner walls of thick-film heating pipes, forming scale. This buildup of scale reduces the thermal conductivity of the thick-film heating pipes, preventing heat from being promptly removed by the water. Consequently, the water temperature remains low, and heat is retained in the thick-film heating layer, causing it to heat up and shorten its service life.

[0003] To avoid the problems caused by scaling, existing thick-film heating equipment is primarily used for pure water heating. However, pure water is expensive and cannot meet daily water needs. Furthermore, research has found that hard water is rich in minerals essential to the human body and is an important source of calcium, magnesium, and other nutrients. Therefore, minimizing the impact of scaling has become a key research area for thick-film heating pipes. For example, spraying a Teflon coating on the pipes of thick-film heating equipment reduces the pipe's roughness, allowing scale to automatically fall off after a certain level of accumulation. However, the low thermal conductivity of the Teflon coating can affect the heat transfer of the thick film, which in turn affects heat exchange and leads to uneven heating in certain areas of the thick film. Furthermore, the Teflon coating has a low temperature resistance, not exceeding 350°C. If the pipe is burned dry, the Teflon coating easily falls off, affecting its usability and increasing its cost.

[0004] For example, CN218309765U discloses a descaling device for a heating tube and electric water heater. This device achieves descaling by adding a mechanical mechanism to the heating tube. However, the mechanical components can interfere with water flow through the tube, resulting in low thermal conductivity and high manufacturing and maintenance costs. Another example is CN219756645U, which discloses a storage-type electric water heater with ultrasonic descaling. This method uses ultrasonic technology to remove scale, but it can cause pipe vibration, compromising safe use.

[0005] Therefore, there is an urgent need for a thick film heating device with scale resistance and descaling functions for completing hard water heating. Summary of the Invention

[0006] In order to solve the problem that existing thick film heating equipment is affected by scale when heating hard water, the present invention provides a scale-resistant thick film heating tube, a thick film heating component and a heater, including a scale-resistant thick film heating tube that can cause scale to fall off in powder form, a thick film heating component that can achieve scale prevention and scale removal based on the scale-resistant thick film heating tube, and a water heater that uses the thick film heating component to complete hard water heating. It can effectively reduce the impact of scale on the thick film heating operation and improve the thermal conductivity of the thick film heating.

[0007] In order to achieve the above-mentioned purpose, the first aspect of the present invention provides a scale-resistant thick-film heating pipe, wherein the thick-film heating layer is arranged on the outer surface of the pipe body, and the inner diameter of the pipe body is It is: 34~93mm.

[0008] Setting the pipe's inner diameter to 34 to 93 mm effectively prevents large scale buildup on the pipe wall, facilitating its shedding in a powdery form. This resolves the problem of reduced thermal conductivity caused by large scale buildup and prevents pipe blockage caused by falling scale.

[0009] Furthermore, the inner diameter of the tube for: or

[0010] Furthermore, the inner diameter of the tube Are: 34mm, 40.5mm, 61mm, 73.2mm, 83.2mm or 93mm.

[0011] Furthermore, the wall thickness of the tube body is T, and T is: 0.5mm≤T<0.7mm, 0.7mm≤T<1.5mm or 1.5mm≤T≤2.5mm.

[0012] The combination of the inner diameter and wall thickness of the pipe body can achieve stable heat exchange and promote the shedding of scale in powder form.

[0013] The roughness (Ra) of the inner wall of the pipe is 0.1<Ra<0.4μm. If the inner wall of the pipe is smooth, the scale will fall off in large pieces and block the pipe. However, if the inner wall of the pipe has a certain degree of roughness, the scale will fall off in powder form and be easily discharged with the water flow.

[0014] Furthermore, the thick film heating layer is provided with an insulating layer, a heating resistor layer and an encapsulation layer from the inside to the outside, and the insulating layer, the heating resistor layer and the encapsulation layer are fixedly connected.

[0015] Furthermore, the heating resistor layer is electrically connected to a conductor circuit.

[0016] Furthermore, the tube body is a tubular structure made of ferritic stainless steel, and the insulating layer, heating resistor layer and encapsulation layer are curled into an annular columnar structure corresponding to the tube body;

[0017] The tube body is fixedly connected to the thick film heating layer.

[0018] The tube body is a tubular structure made of ferritic stainless steel. During the sintering process to prepare the scale-resistant thick-film heating tube, a rough iron-chromium oxide layer will be formed on the inner wall of the tube body. Since the expansion coefficient of ferritic stainless steel is different from the expansion coefficient of scale, and the difference between the two expansion coefficients is large, the scale can be easily removed in powder form.

[0019] A second aspect of the present invention provides a thick film heating assembly including a scale-resistant thick film heating tube.

[0020] Furthermore, it also includes an inner tube, the inner tube is located inside the scale-resistant thick-film heating tube, the inner tube is connected to a water inlet channel, the scale-resistant thick-film heating tube is connected to a water outlet channel, the inner tube is in communication with the scale-resistant thick-film heating tube, and is used to supply water to the scale-resistant thick-film heating tube;

[0021] The thick film heating component is provided with a scale discharge port.

[0022] Cold water enters the scale-resistant thick-film heating tube and hot water is discharged from the scale-resistant thick-film heating tube through the water inlet channel, the water outlet channel and the inner tube.

[0023] The scale-resistant thick-film heating tube will cause the scale to fall off in powder form. The fallen scale is discharged through the water inlet channel, inner tube and scale outlet.

[0024] Furthermore, the scale-resistant thick-film heating tube is externally sheathed with a shell, the upper end of the shell is fixedly connected to the upper head, and the lower end of the shell is fixedly connected to the lower head, and the water inlet channel and the water outlet channel are provided in the upper head.

[0025] Furthermore, a scale discharge channel is provided in the lower head, the scale discharge channel is located below the scale-resistant thick-film heating tube and is communicated with a scale discharge port, and the scale discharge port is located at the bottom of the scale-resistant thick-film heating tube.

[0026] An upper head, a lower head and a shell are provided to protect the scale-resistant thick-film heating tube.

[0027] Furthermore, an annular filter is provided between the upper end of the inner tube and the scale-resistant thick-film heating tube.

[0028] Since scale falls off in powder form, a filter is installed to prevent scale from entering the water outlet channel along with the water flow. The filter is annular in shape and can completely block scale. It is also arranged in a reasonable way to connect to the inner pipe.

[0029] A third aspect of the present invention provides a heater comprising a thick film heating element.

[0030] Furthermore, it also includes a water inlet pipe, a water outlet pipe, a scale discharge pipe and a temperature control module, wherein the water inlet pipe is connected to the water inlet channel, the water outlet pipe is connected to the water outlet channel, and the scale discharge pipe is connected to the scale discharge channel;

[0031] The water inlet pipe is equipped with a water flow sensing feedback module, and the scale discharge pipe is equipped with a scale discharge valve;

[0032] The water flow sensing feedback module and the scale discharge valve are both electrically connected to the temperature control module, the temperature control module is electrically connected to the thick film heating component, and the thick film heating component is connected to the power supply through the temperature control module.

[0033] Water inlet, outlet, and scale removal pipes are provided to facilitate connection to external devices. A temperature control module controls the on / off switching of the heating resistor layer based on the electrical signal output by the water flow sensor feedback module, thereby preventing dry heating of the scale-resistant thick-film heating element. The temperature control module also controls the scale removal valve, enabling switching between the hard water heating and scale removal functions of the thick-film heating element.

[0034] Furthermore, it also includes an installation box, wherein the thick film heating component, the water inlet pipe, the water outlet pipe, the scale discharge pipe, the temperature control module, the water flow sensing feedback module and the scale discharge valve are all fixedly arranged inside the installation box;

[0035] The water inlet pipe, the water outlet pipe and the scale discharge pipe all pass through the inner cavity of the installation box.

[0036] The installation box realizes the modular design of the water heater, which is easy to install and maintain and can be applied to various hard water heating scenarios.

[0037] Furthermore, the temperature control module includes a driver chip, an MCU chip and a button unit, the output end of the water flow sensing feedback module is electrically connected to the input end of the MCU chip, the output end of the MCU chip is connected to the driver chip, and the driver chip is electrically connected to the thick film heating component;

[0038] The output end of the button unit is connected to the input end of the MCU chip, and the output end of the MCU chip is connected to the coil of the dirt discharge valve.

[0039] Furthermore, temperature sensors are provided on both the water inlet pipe and the water outlet pipe, and the output end of the temperature sensor is connected to the input end of the MCU chip.

[0040] The temperature control module adopts embedded system design with simple circuit structure and easy control, providing the hardware foundation for intelligent water temperature control.

[0041] Through the above technical solution, the beneficial effects of the present invention are:

[0042] 1. This scale-resistant thick-film heating tube achieves automatic scale shedding in a powdery form, demonstrating excellent scale resistance. As scale thickness increases, the stress within the scale reaches a threshold, causing the scale fragments to break apart due to compression and fall off. The radius of curvature of the tube wall determines the direction of stress on the scale within. When the inner diameter is between 34 and 93 mm, scale shedding is accelerated, resulting in a powdery form.

[0043] 2. In the present invention, since the scale on the inner wall will automatically fall off when it reaches a certain thickness, the temperature rise of the thick film heating layer will change little under long-term use, thereby ensuring the thermal conductivity of the scale-resistant thick film heating tube and preventing the thick film heating layer from having excessive local temperature differences, thereby achieving uniform heating and ensuring the service life of the scale-resistant thick film heating tube.

[0044] 3. A thick film heating component of the present invention realizes that cold water enters the scale-resistant thick film heating tube and turns into hot water to be discharged, and has the function of removing scale. Cold water enters the scale-resistant thick film heating tube and hot water is discharged from the scale-resistant thick film heating tube through the water inlet channel, the water outlet channel and the inner tube. Under the action of the scale-resistant thick film heating tube, scale will fall off in powder form. During scale removal, cold water enters the water inlet channel, enters the scale-resistant thick film heating tube through the inner tube, and then enters the scale removal channel. The scale that is accumulated under the scale-resistant thick film heating tube due to gravity is discharged with the water flow. The overall structure is simple and easy to operate. This allows the thick film heating component to be in hard water heating operation for a long time.

[0045] 4. The heater of this invention utilizes a modular design, enabling switching between water heating and scale removal functions. This facilitates installation and integration, and can be applied to a variety of hard water heating scenarios. A temperature control module controls the on / off power supply of the heating resistor layer based on the electrical signal output by the water flow sensor feedback module, thereby preventing dry heating of the scale-resistant thick-film heating tube. The temperature control module also controls the scale removal valve, enabling switching between the hard water heating and scale removal functions of the thick-film heating assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is a structural schematic diagram of a scale-resistant thick-film heating tube according to the present invention;

[0047] Figure 2 This is a schematic structural diagram of the thick film heating layer of a scale-resistant thick film heating tube of the present invention.

[0048] Figure 3 This is one of the structural schematic diagrams of a thick film heating component of the present invention;

[0049] Figure 4 This is the second structural diagram of a thick film heating component of the present invention;

[0050] Figure 5 This is a structural schematic diagram of a heater according to the present invention;

[0051] Figure 6 This is a schematic structural diagram of a heater installation box according to the present invention;

[0052] Figure 7 This is a circuit diagram of a temperature control module of a heater according to the present invention.

[0053] Figure numbers: 1 is the tube body, 2 is the insulation layer, 3 is the heating resistor layer, 4 is the conductor line, 5 is the encapsulation layer, 6 is the shell, 7 is the upper head, 8 is the lower head, 9 is the inner tube, 10 is the water inlet channel, 11 is the water outlet channel, 12 is the annular filter, 13 is the scale discharge channel, 14 is the water inlet pipe, 15 is the water outlet pipe, 16 is the scale discharge pipe, 17 is the water flow sensing feedback module, 18 is the scale discharge valve, 19 is the installation box, 20 is the driver chip, 21 is the MCU chip, 22 is the button unit, 24 is the temperature sensor, 25 is the conical head, 26 is the water hole, 27 is the connector, 28 is the scale discharge hole, 29 is the first sealing ring, 30 is the second sealing ring, 31 is the third sealing ring, 100 is the scale-resistant thick film heating tube, and 200 is the thick film heating component. DETAILED DESCRIPTION

[0054] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0055] Example 1

[0056] A scale-resistant thick film heating pipe comprises a pipe body 1 and a thick film heating layer, wherein the thick film heating layer is arranged on the outer surface of the pipe body 1 and the inner diameter of the pipe body 1 is 34~93mm.

[0057] The inner diameter of the tube 1 for: or

[0058] The inner diameter of the tube 1 Are: 34mm, 40.5mm, 61mm, 73.2mm, 83.2mm or 93mm.

[0059] The wall thickness of the tube body 1 is T, and T is: 0.5mm≤T<0.7mm, 0.7mm≤T<1.5mm, or 1.5mm≤T≤2.5mm.

[0060] The roughness (Ra) of the inner wall of the tube body 1 is 0.1<Ra<0.4μm.

[0061] If the inner wall of the pipe body 1 is smooth, the scale will fall off in large pieces and block the pipe. However, if the inner wall of the pipe body 1 has a certain degree of roughness, the scale will fall off in powder form and be easily discharged with the water flow.

[0062] The thick film heating layer is provided with an insulating layer 2, a heating resistor layer 3 and an encapsulating layer 5 from the inside to the outside, and the insulating layer 2, the heating resistor layer 3 and the encapsulating layer 5 are fixedly connected.

[0063] The heating resistor layer 3 is electrically connected to a conductor circuit 4 .

[0064] The tube body 1 is a tubular structure made of ferrite stainless steel, and the insulating layer 2, heating resistor layer 3 and encapsulation layer 5 are curled corresponding to the tube body 1 to form an annular columnar structure;

[0065] The tube body 1 is fixedly connected to the thick film heating layer.

[0066] In this embodiment, the encapsulation layer 5 is made of an insulating material and protects the internal conductive circuit (including the conductor circuit 4 and the heating resistor layer 3). The heating resistor layer 3 includes multiple annular resistor bars, which are equidistantly arranged in a straight line. The multiple annular resistor bars are connected by the conductor circuit 4 to form an annular columnar structure. The conductor circuit 4 is made of a conductive material (such as silver and / or platinum). When the conductor circuit 4 is energized, the multiple annular resistors in the heating resistor layer 3 generate heat, uniformly heating the water inside the pipe body 1. The insulation layer 2 is used to separate the pipe body 1 from the conductive circuit, ensuring electrical safety.

[0067] The insulating layer 2, heating resistor layer 3, and encapsulation layer 5 are all fixed by sintering at 850°C. During the sintering process to prepare the scale-resistant thick-film heating tube, an iron-chromium oxide layer is formed on the inner wall of the tube body 1, which can improve the corrosion resistance of the tube body 1 surface. At the same time, the surface metallographic structure is changed to a certain surface roughness of 0.1 < Ra < 0.4 μm, which causes scale to fall off in powder form and is easily discharged with the water flow. It should be noted that the thick-film heating layer can also be produced using existing technologies.

[0068] During operation, scale on the pipe wall automatically falls off in powder form under the action of stress on the pipe body 1 with an inner diameter of 34 to 93 mm. Due to the large difference in expansion coefficient between ferritic stainless steel and scale, and the rough surface of the iron-chromium oxide layer, scale will periodically fall off at a high frequency. Compared with the large-scale shedding of scale, the powdery shedding is easier to remove.

[0069] In this embodiment, the inner diameter and The temperature of the thick film heating layer of the scale-resistant thick film heating tube was tested under different scale thicknesses, and the power density was 60W / cm2. As shown in Table 1:

[0070] Table 1

[0071]

[0072] According to Table 1, the inner diameter is The scale-resistant thick-film heating tube has a thick-film heating layer whose surface temperature stops rising and begins to fall after reaching a certain temperature. It is observed that the scale inside the tube body 1 begins to fall off after reaching a certain thickness.

[0073] Pick and The scale-resistant thick film heating tube is used to heat tap water for 500 hours, with a sampling interval of 10 hours and a power density of 60W / cm2. As shown in Table 2, the inner diameter is The temperature of the thick film heating layer of the scale-resistant thick film heating tube changes periodically within 500 hours. This proves that the scale-resistant thick film heating tube effectively eliminates the impact of scale on thermal conductivity and can heat tap water for a long time.

[0074] Table 2

[0075]

[0076] Example 2

[0077] A thick film heating assembly includes the scale-resistant thick film heating tube 100 in embodiment 1.

[0078] The device further includes an inner tube 9, which is located inside the scale-resistant thick-film heating tube 100. The inner tube 9 is connected to a water inlet channel 10, and the scale-resistant thick-film heating tube 100 is connected to a water outlet channel 11. The inner tube 9 is connected to the scale-resistant thick-film heating tube 100 to form a water flow channel for supplying water to the scale-resistant thick-film heating tube 100.

[0079] The thick film heating component is provided with a scale discharge port.

[0080] The scale-resistant thick-film heating tube 100 is sheathed with a shell 6 , the upper end of the shell 6 is fixedly connected to the upper head 7 , and the lower end is fixedly connected to the lower head 8 . The water inlet channel 10 and the water outlet channel 11 are provided in the upper head 7 .

[0081] The lower head 8 is provided with a scale discharge channel 13 , which is located below the scale-resistant thick-film heating tube 100 and communicates with a scale discharge port, which is located at the bottom of the scale-resistant thick-film heating tube 100 .

[0082] An annular filter screen 12 is provided between the upper end of the inner tube 9 and the scale-resistant thick-film heating tube 100 .

[0083] A plurality of water holes 26 are circumferentially provided on the inner side of the lower end of the inner tube 9, and a conical head 25 is fixedly provided inside the inner tube 9. After the water flows into the inner tube 9, it is dispersed by the conical head 25, and then flows out from the water holes 26 into the scale-resistant thick-film heating tube 100. The conical head 25 is provided corresponding to the water holes 26 and its tip faces upward to ensure that the water flows downward when flowing out of the inner tube 9.

[0084] A connector 27 is fixedly provided below the inner tube 9 . The connector 27 is funnel-shaped and has a plurality of scale discharge holes 28 on its sidewall. When scale is discharged, the sewage containing scale is discharged downward from the scale discharge holes 28 through the scale discharge channel 13 .

[0085] At least one first sealing ring 29 is arranged between the upper end of the thick film heating tube 100 and the upper head 7, at least one second sealing ring 30 is arranged between the lower end of the thick film heating tube 100 and the lower head 8, and at least one third sealing ring 31 is arranged between the inner tube 9 and the upper head 7. The first sealing ring 29, the second sealing ring 30 and the third sealing ring 31 cooperate to achieve the sealing of the device when heating water flow and discharging scale, thereby avoiding water leakage.

[0086] An annular filter screen 12 is provided between the upper end of the inner tube 9 and the scale-resistant thick-film heating tube 100 .

[0087] When tap water is heated, the descaling channel 13 is in a closed state. Figure 3 As shown by the arrows, cold water enters inner tube 9 through water inlet channel 10 and flows through water hole 26 into scale-resistant thick-film heating tube 100. Under the pressure of the subsequent inlet water, the cold water absorbs heat from the scale-resistant thick-film heating tube 100 during its upward flow, turning into hot water. The hot water then flows out of water outlet channel 11, and the scale removed is trapped by filter 12 and remains in the scale-resistant thick-film heating tube 100.

[0088] When scale needs to be discharged, the scale discharge channel 13 is in an open state and the water outlet channel 11 is in a closed state. Figure 4 As shown by the middle arrow, cold water enters the inner tube 9 through the water inlet channel 10 and flows into the scale-resistant thick film heating tube 100 through the water hole 26. The water flow removes the scale accumulated under the scale-resistant thick film heating tube 100 from the scale discharge hole 28 and the scale discharge channel 13.

[0089] Example 3

[0090] A heater includes the thick film heating component 200 in embodiment 2.

[0091] like Figure 5 As shown, it also includes a water inlet pipe 14, a water outlet pipe 15, a scale discharge pipe 16 and a temperature control module, the water inlet pipe 14 is connected to the water inlet channel 10, the water outlet pipe 15 is connected to the water outlet channel 11, and the scale discharge pipe 16 is connected to the scale discharge channel 13;

[0092] A water flow sensing feedback module 17 is provided on the water inlet pipe 14, and a scale discharge valve 18 is provided on the scale discharge pipe 16;

[0093] The water flow sensing feedback module 17 and the scale removal valve 18 are both electrically connected to the temperature control module, the temperature control module is electrically connected to the thick film heating component 200, and the thick film heating component 200 is connected to the power supply through the temperature control module.

[0094] like Figure 6As shown, it also includes an installation box 19, and the thick film heating component 200, the water inlet pipe 14, the water outlet pipe 15, the scale discharge pipe 16, the temperature control module, the water flow sensing feedback module 17 and the scale discharge valve 18 are all fixedly arranged inside the installation box 19;

[0095] The water inlet pipe 14 , the water outlet pipe 15 and the scale discharge pipe 16 all pass through the inner cavity of the installation box 19 .

[0096] like Figure 7 As shown, the temperature control module includes a driver chip 20, an MCU chip 21 and a button unit 22. The output end of the water flow sensing feedback module 17 is electrically connected to the input end of the MCU chip 21. The output end of the MCU chip 21 is connected to the driver chip 20. The driver chip 20 is electrically connected to the thick film heating component 200.

[0097] The output end of the button unit 22 is connected to the input end of the MCU chip 21 , and the output end of the MCU chip 21 is connected to the coil of the dirt discharge valve 18 .

[0098] The water flow sensing feedback module 17 is a micro switch or a Hall flow meter. In this embodiment, the water flow sensing feedback module 17 uses a Hall flow meter. The descaling valve 18 is a solenoid valve. The driver chip 20 is an L289N driver chip.

[0099] During operation, tap water enters the thick film heating component 200 through the water inlet pipe 14. When there is water flowing in the water inlet pipe 14, the Hall flowmeter outputs an electrical signal to the MCU chip 21. The MCU chip 21 drives the driver chip 20 to work, and the conductor line 4 is energized, so that the heating resistor layer 3 is energized and heated. The cold water becomes hot water during the flow and is discharged from the water outlet pipe 15.

[0100] During the scale removal operation, the key unit 22 sends an electrical signal to the MCU chip 21, which energizes the coil of the scale removal valve 18, opening the valve 18. The MCU chip 21 then controls the driver chip 20 to stop, de-energizing the conductor circuit 4. Cold water enters the thick-film heating assembly 200 through the water inlet pipe 14 and is discharged from the scale removal pipe 16, carrying scale with it.

[0101] Example 4

[0102] The MCU chip 21 of the hardware circuit of Example 3 is configured with an automatic scale removal program, which uses a timer control. For example, every 12 hours, when the Hall flowmeter outputs an electrical signal to the MCU chip 21, the MCU chip 21 controls the driver chip 20 to energize the coil of the scale removal valve 18 and simultaneously de-energize the conductor line 4, thereby removing scale from the thick-film heating assembly 200. The internal timer of the MCU chip 21 is then reset, and the next scale removal operation is ready.

[0103] In addition, both the water inlet pipe 14 and the water outlet pipe 15 are equipped with temperature sensors 24, the output terminals of which are connected to the input terminals of the MCU chip 21. The temperature sensor 24 on the water inlet pipe 14 detects the inlet water temperature, while the temperature sensor 24 on the water outlet pipe 15 detects the outlet water temperature. Based on the outlet and inlet water temperatures, the MCU chip 21 adjusts the output power of the thick-film heating assembly 200 through PWM control, switching the thick-film heating assembly 200 to either single-power heating mode or dual-power heating mode, thereby achieving intelligent water temperature regulation.

[0104] The embodiments described above are only preferred embodiments of the present invention and do not limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made according to the structure, characteristics and principles described in the patent scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A scale-resistant thick-film heating tube, characterized in that: It comprises a tube body (1) and a thick film heating layer, wherein the thick film heating layer is arranged on the outer surface of the tube body (1), and the inner diameter φ of the tube body (1) is 34-93 mm.

2. The scale-resistant thick-film heating tube according to claim 1, characterized in that: The inner diameter φ of the tube body (1) is: 34 mm ≤ φ < 40 mm, 40 mm ≤ φ < 50 mm, 50 mm ≤ φ < 63 mm, 63 mm ≤ φ < 75 mm, 75 mm ≤ φ < 85 mm or 85 mm ≤ φ ≤ 93 mm.

3. The scale-resistant thick-film heating tube according to claim 1, characterized in that: The inner diameter φ of the tube body (1) is: 34 mm, 40.5 mm, 61 mm, 73.2 mm, 83.2 mm or 93 mm.

4. The scale-resistant thick-film heating tube according to claim 1, characterized in that: The wall thickness of the tube body (1) is T, and T is: 0.5 mm ≤ T < 0.7 mm, 0.7 mm ≤ T < 1.5 mm, or 1.5 mm ≤ T ≤ 2.5 mm.

5. The scale-resistant thick-film heating tube according to claim 1, characterized in that: The roughness of the inner wall of the tube body (1) is 0.1<Ra<0.4μm.

6. The scale-resistant thick-film heating tube according to claim 1, characterized in that: The thick film heating layer is provided with an insulating layer (2), a heating resistor layer (3) and an encapsulating layer (5) from the inside to the outside, and the insulating layer (2), the heating resistor layer (3) and the encapsulating layer (5) are fixedly connected.

7. The scale-resistant thick-film heating tube according to claim 6, characterized in that: The heating resistor layer (3) is electrically connected to a conductor line (4).

8. The scale-resistant thick-film heating tube according to claim 6, characterized in that: The tube body (1) is a tubular structure made of ferrite stainless steel, and the insulating layer (2), the heating resistor layer (3) and the encapsulation layer (5) are curled corresponding to the tube body (1) to form an annular columnar structure; The tube body (1) is fixedly connected to the thick film heating layer.

9. A thick film heating component, characterized in that It comprises the scale-resistant thick-film heating tube (100) according to claim 1.

10. A thick film heating component according to claim 9, characterized in that: It also includes an inner tube (9), the inner tube (9) is located inside the scale-resistant thick-film heating tube (100), the inner tube (9) is connected to a water inlet channel (10), the scale-resistant thick-film heating tube (100) is connected to a water outlet channel (11), and the inner tube (9) is in communication with the scale-resistant thick-film heating tube (100); The thick film heating component is provided with a scale discharge port.

11. A thick film heating assembly according to claim 10, characterized in that: The scale-resistant thick-film heating tube (100) is externally sheathed with a shell (6); the upper end of the shell (6) is fixedly connected to an upper head (7), and the lower end is fixedly connected to a lower head (8); the water inlet channel (10) and the water outlet channel (11) are provided in the upper head (7).

12. A thick film heating assembly according to claim 10, characterized in that: A scale discharge channel (13) is provided in the lower head (8), the scale discharge channel (13) is located below the scale-resistant thick-film heating tube (100) and is in communication with a scale discharge port, and the scale discharge port is located at the bottom of the scale-resistant thick-film heating tube (100).

13. A thick film heating assembly according to claim 10, characterized in that: An annular filter screen (12) is provided between the upper end of the inner tube (9) and the scale-resistant thick-film heating tube (100).

14. A heater, characterized in that: Comprising the thick film heating component (200) according to claim 10.

15. A heater according to claim 14, characterized in that: It also includes a water inlet pipe (14), a water outlet pipe (15), a scale discharge pipe (16) and a temperature control module, wherein the water inlet pipe (14) is connected to the water inlet channel (10), the water outlet pipe (15) is connected to the water outlet channel (11), and the scale discharge pipe (16) is connected to the scale discharge channel (13); A water flow sensing feedback module (17) is provided on the water inlet pipe (14), and a scale discharge valve (18) is provided on the scale discharge pipe (16); The water flow sensing feedback module (17) and the scale discharge valve (18) are both electrically connected to the temperature control module, the temperature control module is electrically connected to the thick film heating component (200), and the thick film heating component (200) is connected to a power supply via the temperature control module.

16. A heater according to claim 15, characterized in that: It also includes an installation box (19), wherein the thick film heating component (200), the water inlet pipe (14), the water outlet pipe (15), the scale discharge pipe (16), the temperature control module, the water flow sensing feedback module (17) and the scale discharge valve (18) are all fixedly arranged inside the installation box (19); The water inlet pipe (14), the water outlet pipe (15) and the scale discharge pipe (16) all pass through the inner cavity of the installation box (19).

17. The heater according to claim 15, characterized in that: The temperature control module comprises a driver chip (20), an MCU chip (21) and a key unit (22); the output end of the water flow sensing feedback module (17) is electrically connected to the input end of the MCU chip (21); the output end of the MCU chip (21) is connected to the driver chip (20); and the driver chip (20) is electrically connected to the thick film heating component (200); The output end of the button unit (22) is connected to the input end of the MCU chip (21), and the output end of the MCU chip (21) is connected to the coil of the dirt discharge valve (18).

18. The heater according to claim 15, characterized in that: The water inlet pipe (14) and the water outlet pipe (15) are both provided with a temperature sensor (24), and the output end of the temperature sensor (24) is connected to the input end of the MCU chip (21).

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