Pressure-resistant heating round pipe assembly with built-in threaded water channel and non-return structure

Abstract

The invention relates to a pressure-resistant heating round pipe assembly with a built-in threaded water channel and a non-return structure, and belongs to the technical field of fluid heating, the pressure-resistant heating round pipe assembly comprises a heating sleeve, a drainage inner pipe, a first sealing cover and a second sealing cover, a cavity is formed in the heating sleeve in the axial direction, the drainage inner pipe is located in the cavity, and a spiral protrusion is arranged on the outer side wall of the drainage inner pipe; a threaded water channel is defined by the spiral protrusion and the inner wall of the cavity, the first sealing cover and the second sealing cover are connected to the two ends of the heating sleeve respectively, the first sealing cover is provided with a liquid inlet channel communicated with one end of the threaded water channel, and the second sealing cover is provided with a liquid outlet channel communicated with the other end of the threaded water channel. The heating element is arranged on the heating sleeve and at least arranged on the outer side of the threaded water channel, the spiral protrusion is arranged on the outer side of the drainage inner pipe, the threaded water channel is formed by the spiral protrusion and the inner wall of the heating sleeve, the contact area of liquid and the heating element is greatly increased, and steam can be generated timely and stably. And the experience feeling of customers is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of fluid heating devices, and in particular relates to a pressure-resistant heating round tube assembly with a built-in threaded water channel and a non-return structure. Background Art

[0002] With the rapid development of atomization technology, consumers have put forward higher requirements for the instant steam generation capabilities of products such as sweepers, floor disinfection machines, electric irons and electronic cigarettes. These products not only require efficient completion of their basic functions, such as cleaning, ironing or simulated smoking experience, but also need to achieve a qualitative leap in user experience, especially in terms of the immediacy and stability of steam generation. However, the currently widely used electric heating tube heating elements have shown obvious limitations in the face of these demands.

[0003] Specifically, as a traditional heating element, electric heating tubes have been widely used in various heating devices due to their simple structure, high thermal efficiency, safety and reliability. However, for products that need to generate steam instantly, some electric heating tube heating elements do not heat the atomized liquid sufficiently, resulting in the atomized liquid not being able to be fully atomized into steam by such electric heating tube heating elements, so that steam cannot be generated in a timely and stable manner, which brings a poor experience to customers. Summary of the invention

[0004] In order to solve the problem that some electric heating tube-type heating elements do not sufficiently heat the atomized liquid, resulting in the atomized liquid not being fully atomized into steam by such electric heating tube-type heating elements, thereby making it impossible to generate steam in a timely and stable manner, resulting in a poor user experience for customers, the present invention provides a pressure-resistant heating round tube assembly with a built-in threaded water channel and a non-return structure.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A pressure-resistant heating round tube assembly with a built-in threaded water channel and a non-return structure, comprising a heating sleeve, a drainage inner tube, a first cover and a second cover, wherein a cavity is axially arranged in the heating sleeve, the drainage inner tube is located in the cavity, a spiral protrusion is arranged on the outer wall of the drainage inner tube, and a threaded water channel is formed between the spiral protrusion and the inner wall of the cavity, the first cover and the second cover are respectively connected to the two ends of the heating sleeve, the first cover is provided with a liquid inlet passage connected to one end of the threaded water channel, and the second cover is provided with a liquid outlet passage connected to the other end of the threaded water channel; and a heating element is also included, the heating element is arranged on the heating sleeve, and the heating element is at least arranged outside the threaded water channel.

[0007] As a preferred technical solution of the present invention, an inlet groove is provided on the side of the drainage inner tube close to the first cover, and an outlet groove is provided on the side close to the second cover, the threaded water channel is located between the inlet groove and the outlet groove, and the inlet groove is connected between the liquid inlet passage and the threaded water channel, and the outlet groove is connected between the liquid outlet passage and the threaded water channel.

[0008] As a preferred technical solution of the present invention, the liquid inlet passage extends into the inlet groove, and the part of the liquid inlet passage extending into the inlet groove is provided with a first liquid inlet hole connected to the inlet groove, and the bottom of the side wall of the inlet groove is provided with a second liquid inlet hole connected to the threaded water channel.

[0009] As a preferred technical solution of the present invention, a non-return structure is provided in the outlet groove, and the non-return structure is used to control the conduction or blocking of the liquid outlet passage.

[0010] As a preferred technical solution of the present invention, the anti-return structure includes a spring and a block, one end of the spring abuts against the outlet slot body, and the other end abuts against one end of the block, and the other end of the block abuts against the liquid outlet passage to make the liquid outlet passage conductive or blocked; the elastic force direction of the spring is toward the liquid outlet passage, and the side of the block abutting against the liquid outlet passage is an inclined structure that gradually extends toward the liquid outlet direction in the direction of the central axis of the liquid outlet passage.

[0011] As a preferred technical solution of the present invention, the protrusion height of the spiral protrusion is not more than 1.5 mm, the cross-section of the spiral protrusion is one of a triangle, a trapezoid, a rectangle, a circle and a semi-ellipse, and the drainage inner tube and the spiral protrusion are both made of stainless steel or ceramic.

[0012] As a preferred technical solution of the present invention, a first step portion is provided on the side of the first cover and the second cover facing the heating sleeve, and a second step portion corresponding to the first step portion is provided on the side of the heating sleeve facing the first cover and the second cover, the first step portion is clamped with the second step portion, and the first step portion and the second step portion are fixed by laser welding or argon arc welding.

[0013] As a preferred technical solution of the present invention, a temperature sensor is provided in the liquid outlet passage, and the temperature sensor is electrically connected to the heating element.

[0014] As a preferred technical solution of the present invention, the heating element includes a first insulating protective layer, a substrate and a second insulating protective layer, the first insulating protective layer is coated on the first surface of the substrate, the second insulating protective layer is coated on the second surface of the substrate, and the first insulating protective layer and the second insulating protective layer enclose and wrap the substrate; a first pad film, a heating power resistor film and a power pin line are provided on the first surface of the substrate, and the heating power resistor film and the power pin line are both electrically connected to the first pad film; a second pad film, a temperature measuring PTC resistor film and a signal pin line are provided on the second surface of the substrate, the temperature measuring PTC resistor film and the signal pin line are both electrically connected to the second pad film, the signal pin line is connected to an external control circuit, and the temperature measuring PTC resistor film feeds back the temperature condition of the substrate to the external control circuit through the signal pin line; and also includes an electrical connector, which is electrically connected to the power pin line through a wire, and the electrical connector is used to connect to an external power supply.

[0015] As a preferred technical solution of the present invention, the substrate is a yttrium-doped zirconia ceramic substrate; the material of the heating power resistor film contains palladium / silver precious metal or ruthenium oxide / palladium / silver alloy; the material of the temperature measuring PTC resistor film contains palladium / silver precious metal or ruthenium oxide / palladium / silver alloy.

[0016] The beneficial effects of the present invention are:

[0017] This solution greatly increases the contact area between the liquid and the heating element by setting a spiral protrusion on the outside of the drainage inner tube to form a threaded water channel with the inner wall of the heating sleeve, thereby improving the heating efficiency. After the liquid is heated, it is vaporized and output through the liquid outlet passage, so that steam can be generated in a timely and stable manner, improving the customer experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of a pressure-resistant heating round tube assembly with a built-in threaded water channel and a non-return structure according to the present invention;

[0020] Figure 2 It is a schematic diagram of the exploded structure of a pressure-resistant heating round tube assembly with a built-in threaded water channel and a non-return structure according to the present invention;

[0021] Figure 3 It is a cross-sectional view of a pressure-resistant heating round pipe assembly with a built-in threaded water channel and a non-return structure according to the present invention;

[0022] Figure 4 It is a cross-sectional view of a first cover of a pressure-resistant heating round tube assembly with a built-in threaded water channel and a non-return structure according to the present invention;

[0023] Figure 5 It is a schematic diagram of the exploded structure of a heating element of a pressure-resistant heating round tube assembly with a built-in threaded water channel and a non-return structure according to the present invention;

[0024] Description of main symbols

[0025] In the figure: 1, drainage inner tube; 2, heating sleeve; 3, first cover; 4, second cover; 5, heating element; 6, anti-return structure; 7, first step portion;

[0026] 101, threaded water channel; 102, spiral protrusion; 103, inlet groove; 104, outlet groove;

[0027] 301, liquid inlet passage;

[0028] 401. Outlet passage;

[0029] 501, first insulating protective layer; 502, second insulating protective layer; 503, substrate; 504, first pad film; 505, heating power resistor film; 506, power pin line; 507, second pad film; 508, temperature measuring PTC resistor film; 509, signal pin line; 510, electrical connector; 511, wire; 601, spring; 602, stopper. DETAILED DESCRIPTION

[0030] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0031] See also Figure 1-5The present embodiment provides a pressure-resistant heating round tube assembly with a built-in threaded water channel and a non-return structure, including a heating sleeve 2, a drainage inner tube 1, a first cover 3 and a second cover 4, a cavity is axially arranged in the heating sleeve 2, the drainage inner tube 1 is located in the cavity, a spiral protrusion 102 is arranged on the outer wall of the drainage inner tube 1, and a threaded water channel 101 is formed between the spiral protrusion 102 and the inner wall of the cavity, the first cover 3 and the second cover 4 are respectively connected to the two ends of the heating sleeve 2, a liquid inlet passage 301 connected to one end of the threaded water channel 101 is arranged on the first cover 3, and a liquid outlet passage 401 connected to the other end of the threaded water channel 101 is arranged on the second cover 4; and a heating element 5 is also included, the heating element 5 is arranged on the heating sleeve 2, and the heating element 5 is at least arranged outside the threaded water channel 101. It is understandable that this embodiment greatly increases the contact area between the liquid and the heating element by setting a spiral protrusion 102 on the outside of the drainage inner tube 1 to form a threaded water channel 101 with the inner wall of the heating sleeve 2, thereby improving the heating efficiency. The design of the spiral water channel also helps the liquid to form vortices during the flow process, enhances the mixing effect, and makes the liquid heated more evenly. In a possible action process, the atomized liquid enters the threaded water channel 101 through the liquid inlet passage 301 on the first cover 3. When the liquid flows in the threaded water channel 101, it is heated by the outer heating element 5, rapidly heats up and partially vaporizes. The heated liquid continues to flow to the second cover 4 and is discharged through the liquid outlet passage 401. At this time, most of the atomized liquid has been converted into steam.

[0032] Furthermore, the drainage inner tube 1 is provided with an inlet groove 103 on one side close to the first cover 3, and an outlet groove 104 on one side close to the second cover 4, the threaded water channel 101 is located between the inlet groove 103 and the outlet groove 104, and the inlet groove 103 is connected between the liquid inlet passage 301 and the threaded water channel 101, and the outlet groove 104 is connected between the liquid outlet passage 401 and the threaded water channel 101. It can be understood that the design of the inlet groove 103 and the outlet groove 104 is intended to provide a smoother fluid transition area, reduce the turbulence and resistance generated when the fluid changes direction, thereby ensuring that the liquid can enter the threaded water channel 101 more smoothly for heating, and stably discharge steam after heating. In a feasible action process, the atomized liquid enters the inlet groove 103 through the liquid inlet passage 301 on the first cover 3, and the liquid can be smoothly decelerated and diffused, reducing the impact and turbulence caused by excessive flow rate; after being buffered by the inlet groove 103, the liquid enters the threaded water channel 101 in the flow channel cavity and flows along the threaded path formed by the spiral protrusion 102, fully contacting the heating element 5 to achieve uniform heating; the heated liquid is partially vaporized to form a mixture of steam and liquid, and as the fluid continues to flow forward, it enters the outlet groove 104, and the outlet groove 104 also provides a smooth transition area, so that the steam can be discharged smoothly through the liquid outlet passage 401.

[0033] Furthermore, the liquid inlet passage 301 extends into the inlet groove 103 , and the portion of the liquid inlet passage 301 extending into the inlet groove 103 is provided with a first liquid inlet hole connected to the inlet groove 103 , and the bottom of the side wall of the inlet groove 103 is provided with a second liquid inlet hole connected to the threaded water channel 101 .

[0034] Furthermore, a non-return structure 6 is provided in the outlet groove 104, and the non-return structure 6 is used to control the conduction or blocking of the liquid outlet passage 401. Specifically, the non-return structure 6 includes a spring 601 and a stopper 602, one end of the spring 601 abuts against the outlet groove 104 body, and the other end abuts against one end of the stopper 602, and the other end of the stopper 602 abuts against the liquid outlet passage 401, so as to conduct or block the liquid outlet passage 401; the elastic force direction of the spring 601 is toward the liquid outlet passage 401, and the side of the stopper 602 abutting against the liquid outlet passage 401 is an inclined structure gradually extending toward the liquid outlet direction in the direction of the central axis of the liquid outlet passage 401. It can be understood that when the fluid and / or steam enters the outlet groove 104 through the threaded water channel 101, the block 602 is acted upon by the elastic force of the spring 601 to block the liquid outlet passage 401. At this time, the fluid and / or steam will act on the inclined structure of the block 602 so that the block 602 compresses the spring 601, thereby opening the liquid outlet passage 401 and making it conductive, so that the fluid and / or steam can flow out of the liquid outlet passage 401.

[0035] Further, the protrusion height of the spiral protrusion 102 is not more than 1.5mm, the cross section of the spiral protrusion 102 is one of a triangle, a trapezoid, a rectangle, a circle and a semi-ellipse, and the drainage inner tube 1 and the spiral protrusion 102 are made of stainless steel or ceramic. It is understandable that the greater the protrusion height of the spiral protrusion 102, the greater the flow rate of the liquid, which is likely to cause the liquid heating effect to be poor and fail to meet the needs of the user. The height of the spiral protrusion 102 is not more than 1.5mm, which further makes the liquid heating effect excellent. It is understandable that by adjusting the geometric parameters of the spiral protrusion 102 (such as the protrusion height and the cross-sectional shape), the flow rate and flow state of the liquid can be controlled, so that the liquid can fully contact with the heating element 5 during the heating process, and the present embodiment ensures that the liquid can be fully heated during the flow process by limiting the protrusion height of the spiral protrusion 102 to not more than 1.5mm, avoiding the problem of insufficient heating caused by too fast flow rate.

[0036] Furthermore, the first cover 3 and the second cover 4 are both provided with a first step portion 7 on the side facing the heating sleeve 2, and the heating sleeve 2 is both provided with a second step portion corresponding to the first step portion 7 on the side facing the first cover 3 and the second cover 4. The first step portion 7 is clamped with the second step portion, and the first step portion 7 is fixed with the second step portion by laser welding or argon arc welding. It can be understood that in this embodiment, the geometric matching of the first step portion 7 and the second step portion is used to achieve preliminary clamping and fixing, increase the preload force and stability of the connection, and on the basis of the clamping of the first step portion 7 and the second step portion, the high-strength connection technology of laser welding or argon arc welding is used to achieve permanent fixation between the components, ensure the sealing and strength of the connection, effectively prevent the occurrence of fluid leakage problems, and ensure heating efficiency and safety.

[0037] In order to avoid excessive or insufficient heating due to lack of real-time temperature feedback, which affects the heating effect and equipment life, further, a temperature sensor is provided in the liquid outlet passage 401 in this embodiment, and the temperature sensor is electrically connected to the heating element 5. The temperature sensor is used to monitor the fluid temperature in real time, and the temperature signal is converted into an electrical signal output. The output signal of the temperature sensor is electrically connected to the control circuit of the heating element 5. Through a preset temperature control algorithm, the power output of the heating element 5 is automatically adjusted to achieve intelligent temperature control.

[0038] In another embodiment, the heating element 5 includes a first insulating protective layer 501, a substrate 503 and a second insulating protective layer 502, wherein the first insulating protective layer 501 is coated on the first surface of the substrate 503, and the second insulating protective layer 502 is coated on the second surface of the substrate 503, and the first insulating protective layer 501 and the second insulating protective layer 502 enclose and wrap the substrate 503; a first pad film 504, a heating power resistor film 505 and a power pin line 506 are provided on the first surface of the substrate 503, and the heating power resistor film 505 and the power pin line 506 are electrically connected to the first pad film 504; The second surface of the substrate 503 is provided with a second pad film 507, a temperature measuring PTC resistor film 508 and a signal pin line 509, the temperature measuring PTC resistor film 508 and the signal pin line 509 are both electrically connected to the second pad film 507, the signal pin line 509 is connected to the external control circuit, and the temperature measuring PTC resistor film 508 feeds back the temperature condition of the substrate 503 to the external control circuit through the signal pin line 509; It also includes an electrical connector 510, the electrical connector 510 is electrically connected to the power pin line 506 through a wire 511, and the electrical connector 510 is used to connect to an external power supply. It can be understood that in this embodiment, the temperature measuring PTC resistor film 508 and the heating power resistor film 505 are respectively provided on both sides of the substrate 503, and the temperature of the substrate 503 is monitored in real time through the characteristics of the PTC resistor changing with temperature, and the temperature information is transmitted to the external control circuit through the signal pin line 509 to achieve precise temperature control. When an external power source is connected through the electrical connector 510, current flows through the power pin line 506 and the first pad film 504 to the heating power resistor film 505, generating heat to heat the substrate 503 and the surrounding medium. The temperature measuring PTC resistor film 508 changes its resistance value as the temperature of the substrate 503 changes. The change is transmitted to the external control circuit through the signal pin line 509. The external control circuit adjusts the power output according to the received temperature signal to ensure that the temperature of the substrate 503 is maintained within the set range, thereby achieving precise temperature control and improving heating efficiency and product quality.

[0039] Specifically, the substrate 503 is a yttrium-doped zirconia ceramic substrate. The yttrium-doped zirconia (YSZ) ceramic substrate is known for its excellent high temperature resistance, corrosion resistance, high insulation and good thermal conductivity. The yttrium-doped zirconia ceramic can still remain stable in a high temperature environment and is not easy to deform or fail. The yttrium-doped zirconia ceramic substrate is used as the support structure of the heating element 5, which can not only withstand the thermal stress during high temperature heating, but also its good thermal conductivity helps to evenly distribute heat and improve heating efficiency. The material of the heating power resistor film 505 contains palladium / silver precious metal or ruthenium oxide / palladium / silver alloy. Selecting palladium / silver precious metal or ruthenium oxide / palladium / silver alloy as the material of the heating power resistor film 505 can ensure that the heating element 5 can work continuously and stably in a high temperature environment, and resistance drift or burning is not likely to occur. At the same time, the high conductivity of these materials also reduces energy loss and improves heating efficiency. The material of the temperature measuring PTC resistor film 508 contains palladium / silver precious metal or ruthenium oxide / palladium / silver alloy.

[0040] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A pressure-resistant heating round pipe assembly with a built-in threaded water channel and a non-return structure, characterized in that: The invention comprises a heating sleeve, an inner drainage tube, a first sealing cover and a second sealing cover, wherein a cavity is axially arranged in the heating sleeve, the inner drainage tube is located in the cavity, a spiral protrusion is arranged on the outer wall of the inner drainage tube, a threaded water channel is formed between the spiral protrusion and the inner wall of the cavity, the first sealing cover and the second sealing cover are respectively connected to the two ends of the heating sleeve, the first sealing cover is provided with a liquid inlet passage connected to one end of the threaded water channel, and the second sealing cover is provided with a liquid outlet passage connected to the other end of the threaded water channel; and the invention also comprises a heating element, which is arranged on the heating sleeve and is at least arranged on the outside of the threaded water channel.

2. A pressure-resistant heating round pipe assembly with a built-in threaded water channel and a non-return structure according to claim 1, characterized in that: The drainage inner tube is provided with an inlet groove on the side close to the first cover, and an outlet groove on the side close to the second cover. The threaded water channel is located between the inlet groove and the outlet groove, and the inlet groove is connected between the liquid inlet passage and the threaded water channel, and the outlet groove is connected between the liquid outlet passage and the threaded water channel.

3. A pressure-resistant heating round pipe assembly with a built-in threaded water channel and a non-return structure according to claim 2, characterized in that: The liquid inlet passage extends into the inlet groove, and the portion of the liquid inlet passage extending into the inlet groove is provided with a first liquid inlet hole connected to the inlet groove, and the bottom of the side wall of the inlet groove is provided with a second liquid inlet hole connected to the threaded water channel.

4. A pressure-resistant heating round pipe assembly with a built-in threaded water channel and a non-return structure according to claim 3, characterized in that: A non-return structure is provided in the outlet groove, and the non-return structure is used to control the conduction or blocking of the liquid outlet passage.

5. A pressure-resistant heating round pipe assembly with a built-in threaded water channel and a non-return structure according to claim 4, characterized in that: The anti-return structure includes a spring and a block, one end of the spring abuts against the outlet slot body, and the other end abuts against one end of the block, and the other end of the block abuts against the liquid outlet passage to make the liquid outlet passage conductive or blocked; the elastic force direction of the spring is toward the liquid outlet passage, and the side of the block abutting against the liquid outlet passage is an inclined structure that gradually extends toward the liquid outlet direction in the direction of the central axis of the liquid outlet passage.

6. A pressure-resistant heating round pipe assembly with a built-in threaded water channel and a non-return structure according to claim 1, characterized in that: The protrusion height of the spiral protrusion is not greater than 1.5 mm, the cross-section of the spiral protrusion is one of a triangle, a trapezoid, a rectangle, a circle and a semi-ellipse, and the inner drainage tube and the spiral protrusion are both made of stainless steel or ceramic.

7. A pressure-resistant heating round pipe assembly with a built-in threaded water channel and a non-return structure according to claim 1, characterized in that: The first cover and the second cover are each provided with a first step portion on one side facing the heating sleeve, and the heating sleeve is each provided with a second step portion corresponding to the first step portion on one side facing the first cover and the second cover, the first step portion is clamped with the second step portion, and the first step portion and the second step portion are fixed by laser welding or argon arc welding.

8. A pressure-resistant heating round pipe assembly with a built-in threaded water channel and a non-return structure according to claim 1, characterized in that: A temperature sensor is arranged in the liquid outlet passage, and the temperature sensor is electrically connected to the heating element.

9. A pressure-resistant heating round pipe assembly with a built-in threaded water channel and a non-return structure according to claim 1, characterized in that: The heating element includes a first insulating protective layer, a substrate and a second insulating protective layer, the first insulating protective layer is coated on the first surface of the substrate, the second insulating protective layer is coated on the second surface of the substrate, and the first insulating protective layer and the second insulating protective layer enclose and wrap the substrate; a first pad film, a heating power resistor film and a power pin line are provided on the first surface of the substrate, and the heating power resistor film and the power pin line are both electrically connected to the first pad film; a second pad film, a temperature measuring PTC resistor film and a signal pin line are provided on the second surface of the substrate, the temperature measuring PTC resistor film and the signal pin line are both electrically connected to the second pad film, the signal pin line is connected to an external control circuit, and the temperature measuring PTC resistor film feeds back the temperature condition of the substrate to the external control circuit through the signal pin line; and also includes an electrical connector, which is electrically connected to the power pin line through a wire, and the electrical connector is used to connect to an external power supply.

10. A pressure-resistant heating round pipe assembly with a built-in threaded water channel and a non-return structure according to claim 9, characterized in that: The substrate is a yttrium-doped zirconium oxide ceramic substrate; the material of the heating power resistor film contains palladium / silver precious metal or ruthenium oxide / palladium / silver alloy; the material of the temperature measuring PTC resistor film contains palladium / silver precious metal or ruthenium oxide / palladium / silver alloy.

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