Liquid heater utilizing rotational flow

Abstract

The utility model discloses a liquid heater utilizing rotational flow, which comprises an outer pipe, a heating pipe, a spiral flow deflector and a sealing end cover, the heating pipe and the outer pipe are both circular pipes, the outer pipe is coaxially arranged on the outer side of the heating pipe, a cylindrical cavity is arranged between the outer pipe and the heating pipe, the spiral flow deflector is arranged in the cylindrical cavity, and the sealing end cover is arranged on the spiral flow deflector. Sealing end covers are arranged at the two ends of the cylindrical cavity, and a water inlet pipe and a water outlet pipe which are communicated with the outside are arranged on the two sealing end covers respectively; the spiral flow deflector is coaxially embedded between the heating pipe and the outer pipe, a heating cavity is jointly defined by the spiral flow deflector, the outer pipe, the heating pipe and the two sealing end covers, and the heating cavity is a flow channel rotating along the axis; the water inlet pipe introduces water flow into the heating cavity, the water flow is continuously heated in the process of rotating and flowing around the heating cavity, and the heated water flow flows out of the water outlet pipe. According to the liquid heater, rotational flow is constructed in the heating cavity, so that the mixing efficiency of fluids with different temperatures is improved, and the overall heat exchange efficiency of the heater is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of vehicle heaters, and in particular relates to a liquid heater utilizing swirl flow. Background Art

[0002] Liquid heaters are one of the core components in the thermal management system of electric vehicles. First, liquid heaters play a vital role in cold weather conditions. Low temperatures can reduce battery performance, resulting in a decrease in battery capacity and power output, which affects the vehicle's range and performance. Liquid heaters effectively prevent the battery temperature from being too low by warming the coolant, thereby maintaining the battery's optimal operating temperature. Not only does this improve battery performance, it also extends the battery's life and reduces maintenance costs. Secondly, liquid heaters also play a key role in cold starts. Electric vehicles require a lot of electrical energy when starting, especially in cold conditions. If the battery temperature is too low, the energy loss during the start-up process will be greater, affecting the vehicle's starting performance. By heating the coolant before starting, liquid heaters can help reduce this energy loss and improve efficiency during cold starts. In addition, liquid heaters can also perform temperature control while the vehicle is running, ensuring that the temperature of the battery and other key components remains within the appropriate range. This is critical to optimizing the performance and efficiency of electric vehicles, especially in hot or extremely cold climates.

[0003] In summary, the role of liquid heaters in electric vehicles is not only to control temperature, but also an indispensable component to ensure that the vehicle can operate efficiently and reliably in various climate conditions. At present, automotive liquid heaters generally have the defects of low heating efficiency and short service life, and cannot adapt to the driving needs of electric vehicles in extreme weather. Therefore, it is necessary to improve the liquid heaters for electric vehicles so that the liquid heaters can meet the basic needs of sustainability and performance of electric vehicles. Utility Model Content

[0004] In response to the above problems and technical requirements, the utility model provides a liquid heater utilizing swirl flow, which constructs a swirl flow in a heating chamber to increase the mixing efficiency of fluids at different temperatures, thereby improving the overall heat exchange efficiency of the heater.

[0005] The technical scheme of the utility model is as follows: a liquid heater utilizing swirl flow, comprising an outer tube, a heating tube, a spiral guide plate and a sealing end cover, the heating tube and the outer tube are both circular tubes, the outer tube is coaxially arranged on the outside of the heating tube, a cylindrical cavity is formed between the outer tube and the heating tube, a spiral guide plate is arranged in the cylindrical cavity, sealing end covers are arranged at both ends of the cylindrical cavity, and a water inlet pipe and a water outlet pipe connected to the outside are respectively provided on the two sealing end covers; the spiral guide plate is coaxially inlaid between the heating tube and the outer tube, the spiral guide plate, the outer tube, the heating tube and the two sealing end covers jointly enclose a heating chamber, and the heating chamber is a flow channel rotating along the axis; the heat of the heating tube is dissipated from the inner wall to the outside, the heat is continuously transferred to the heating chamber, the water inlet pipe introduces the water flow into the heating chamber, the water flow is continuously heated during the rotating flow around the heating chamber, and the heated water flow flows out from the water outlet pipe.

[0006] In the above scheme, the heating chamber in the liquid heater is set as a spiral flow channel through a spiral guide vane. When the heated liquid flows through the spiral flow channel, the flow direction will change radially to form a local or overall vortex, as well as a secondary flow that flushes the heat exchange surface. The heat exchange surface here is the outer side of the heating tube. This vortex or secondary flow form can enhance the mixing of fluids of different temperatures, inhibit or destroy the development of the thermal boundary layer, thin the thermal boundary, and obtain higher heat exchange performance.

[0007] Furthermore, the outer tube, the heating tube and the sealing end cap are welded; the outer tube, the heating tube, the sealing end cap and the spiral guide plate are all made of aluminum alloy or stainless steel. The welding connection can ensure the airtightness between the tube body and the end cap, and the aluminum alloy and stainless steel have good thermal conductivity and stable mechanical properties.

[0008] Furthermore, the heating tube includes two semicircular heating plates welded together, each heating plate has a heating assembly attached to its inner wall, the heating assembly includes a resistance wire, a wire and an insulating layer, the resistance wire is evenly distributed on the inner wall of the heating plate, an insulating layer is provided around and on the surface of the resistance wire, and wires are provided at both ends of the resistance wire. After the two semicircular heating plates have completed the arrangement process of the resistance wire and the insulating layer, the two heating plates are symmetrically welded together, so that a uniformly heated heating tube can be obtained, which is easy to process and simplifies the processing technology.

[0009] Furthermore, the resistance wire is evenly distributed in a meandering line shape on the inner wall of the semicircular heating plate along the axial direction. The meandering line shape of the resistance wire evenly distributed on the inner wall of the heating plate can increase the adhesion length and radiation area with the heating plate, so that the heat emitted by the resistance wire after being energized can be evenly transferred to the heating plate.

[0010] Furthermore, the insulating layer covers the entire inner wall of the heating plate, and the insulating layer adheres the resistance wire to the inner wall of the heating plate.

[0011] Furthermore, the insulating layer is made of glass or ceramic material, and the insulating layer is covered on the surface of the resistance wire by thick film screen printing or thermal spraying to seal the resistance wire inside. The insulating layer is made of a material with high temperature resistance and good thermal conductivity, and the insulating layer can protect the internal resistance wire.

[0012] Furthermore, the wire is led out from the insulating layer and connected to an external power source to energize the resistance wire, so that the resistance wire generates heat and heats the heating chamber.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] In this heater, a spiral heating chamber is constructed by the cooperation of the spiral guide plate and the inner and outer tube bodies. This heating chamber can be regarded as a turbulent structure. When the liquid flows through the heating chamber, the liquid rotates to produce vortex, the liquid flushes the heat exchange surface to produce secondary flow, and the liquid produces turbulence while producing vortex. These three water flows interact with each other at the same time, causing the cold and hot fluids to move in a random and chaotic manner. The heat does not gradually penetrate outward from the outer peripheral surface of the heating tube, but quickly completes the heat exchange during the fluid convection movement and reaches a relatively stable temperature, thereby obtaining a higher heat exchange performance.

[0015] When the liquid rotates, a continuous secondary flow is generated to flush the heat exchange surface. The secondary flow can quickly take away the heat on the outside of the heating tube, inhibit or destroy the development of the thermal boundary layer, thereby thinning the thermal boundary layer. The heat is transferred outward at the fastest speed instead of being retained at the place where the heat is generated, ultimately improving the overall heat exchange efficiency of the heater.

[0016] Compared with ordinary straight channels, the rotating heating chamber greatly prolongs the distance and time that the liquid flows in the chamber, so the liquid can absorb more heat and the heating effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is an external three-dimensional structural diagram of the liquid heater of the utility model;

[0018] Figure 2 is an axial cross-sectional view of the liquid heater;

[0019] Figure 3 This is a structural diagram of the heating tube in the liquid heater;

[0020] Figure 4 It is a structural diagram of the heating tube and the internal heating component;

[0021] Figure 5 The figure is an assembly diagram of the sealing end cover, the heating tube and the spiral guide vane;

[0022] Figure 6 It is the structural diagram of the spiral guide vane;

[0023] Figure 7 The diagram is the arrangement of the resistance wire on the inner wall of the heating plate;

[0024] Marked in the figure are: outer tube 1, heating tube 2, heating plate 21, heating component 22, resistance wire 221, wire 222, insulating layer 223, spiral guide plate 3, sealing end cover 4, water inlet pipe 41, water outlet pipe 42, heating chamber 5. DETAILED DESCRIPTION

[0025] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0026] like Figure 1-7 The utility model shows a liquid heater using swirl, including an outer tube 1, a heating tube 2, a spiral guide plate 3 and a sealed end cover 4. The heating tube 2 and the outer tube 1 are both round tubes. The outer tube 1 is coaxially arranged on the outside of the heating tube 2. There is a cylindrical cavity between the outer tube 1 and the heating tube 2. The spiral guide plate 3 is arranged in the cylindrical cavity. The two ends of the cylindrical cavity are provided with sealed end covers 4. The two sealed end covers 4 are respectively provided with an inlet pipe 41 and an outlet pipe 42 connected to the outside; the outer tube 1, the heating tube 2 and the sealed end cover 4 are welded; the outer tube 1, the heating tube 2, the sealed end cover 4 and the spiral guide plate 3 are all made of aluminum alloy or stainless steel. The welding connection can ensure the airtightness between the tube body and the end cover. The aluminum alloy and stainless steel have good thermal conductivity and stable mechanical properties.

[0027] The spiral guide plate 3 is coaxially embedded between the heating tube 2 and the outer tube 1. The spiral guide plate 3, the outer tube 1, the heating tube 2 and the two sealing end caps 4 together enclose a heating chamber 5. The heating chamber 5 is a flow channel rotating along the axis. The heat of the heating tube 2 is dissipated from the inner wall to the outside, and the heat is continuously transferred to the heating chamber 5. The water inlet pipe 41 introduces the water flow into the heating chamber 5. The water flow is continuously heated during the process of rotating around the heating chamber 5. The heated water flows out from the outlet pipe 42. The heating chamber 5 in the liquid heater is set as a spiral flow channel by the spiral guide plate 3. When the heated liquid flows through the spiral flow channel, the flow direction will change radially to form a local or overall vortex, and form a secondary flow to flush the heat exchange surface. The heat exchange surface here is the outer side of the heating tube. This vortex or secondary flow form can enhance the mixing of fluids of different temperatures, inhibit or destroy the development of the thermal boundary layer, thin the thermal boundary, and obtain a higher heat exchange performance.

[0028] The heating tube 2 includes two semicircular heating plates 21 welded together, and a heating assembly 22 is attached to the inner wall of each heating plate 21. The heating assembly 22 includes a resistance wire 221, a wire 222 and an insulating layer 223. The resistance wire 221 is evenly distributed on the inner wall of the heating plate 21, and an insulating layer 223 is provided around and on the surface of the resistance wire 221. Wires 222 are provided at both ends of the resistance wire 221. The resistance wire 221 is evenly distributed in a zigzag shape along the axial direction on the inner wall of the semicircular heating plate 21. The insulating layer 223 covers the inner wall of the entire heating plate 21, and the insulating layer 223 adheres the resistance wire 221 to the inner wall of the heating plate 21. The wire 222 is led outward from the insulating layer 223. The wire 222 is connected to an external power supply, and the resistance wire 221 is energized, and the resistance wire 221 is heated to heat the heating chamber 5.

[0029] The insulating layer 223 is made of glass or ceramic material, and is covered on the surface of the resistance wire 221 by thick film screen printing or thermal spraying, sealing the resistance wire 221 inside. The insulating layer 223 is made of a material that is resistant to high temperature and has good thermal conductivity, and the insulating layer 223 can protect the internal resistance wire 221.

[0030] After the two semicircular heating plates 21 are respectively arranged with the resistance wire 221 and the insulating layer 223, the two heating plates 21 are symmetrically welded together to obtain a uniformly heated heating tube 2, which is easy to process and simplifies the processing technology. The resistance wire 221 is evenly distributed on the inner wall of the heating plate 21 in a meandering line shape, which can increase the adhesion length and radiation area with the heating plate 21, so that the heat emitted by the resistance wire 221 after being energized can be evenly transferred to the heating plate 21.

[0031] The application principle of the utility model is as follows: the liquid to be heated enters the heating chamber 5 from the inlet and outlet pipes. When the liquid flows through the spiral heating chamber 5, it rotates and accelerates along the surface of the spiral guide vane 3 due to the shape resistance, thereby forming a vortex in the heating chamber 5. At the same time, the outer surface of the heating tube 2 is washed around the spiral guide vane 3 at a large lateral speed. The outer surface of the heating tube 2 is the heat exchange surface. This vortex can enhance the mixing of fluids of different temperatures, while inhibiting or destroying the development of the thermal boundary layer to thin the thermal boundary and obtain a higher heat transfer coefficient. After the liquid is heated, it flows out from the water outlet pipe 42 at the other end.

[0032] The above are only several preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes and substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A liquid heater using a swirl flow, characterized in that: It includes an outer tube, a heating tube, a spiral guide plate and a sealing end cover. The heating tube and the outer tube are both circular tubes. The outer tube is coaxially arranged on the outside of the heating tube. There is a cylindrical cavity between the outer tube and the heating tube. A spiral guide plate is arranged in the cylindrical cavity. Sealing end covers are arranged at both ends of the cylindrical cavity. A water inlet pipe and a water outlet pipe connected to the outside are respectively arranged on the two sealing end covers. The spiral guide plate is coaxially inlaid between the heating tube and the outer tube. The spiral guide plate, the outer tube, the heating tube and the two sealing end covers jointly enclose a heating cavity. The heating cavity is a flow channel rotating along the axis. The heat of the heating tube is dissipated from the inner wall to the outside, and the heat is continuously transferred to the heating cavity. The water inlet pipe introduces water flow into the heating cavity. The water flow is continuously heated during the rotation and flow around the heating cavity, and the heated water flows out from the water outlet pipe.

2. A liquid heater using swirl according to claim 1, characterized in that: The outer tube, the heating tube and the sealing end cover are welded and connected; the outer tube, the heating tube, the sealing end cover and the spiral guide plate are all made of aluminum alloy or stainless steel.

3. A liquid heater using swirl according to claim 2, characterized in that: The heating tube includes two semicircular heating plates welded together, each heating plate has a heating assembly attached to its inner wall, the heating assembly includes a resistance wire, a conducting wire and an insulating layer, the resistance wire is evenly distributed on the inner wall of the heating plate, an insulating layer is provided around and on the surface of the resistance wire, and conducting wires are provided at both ends of the resistance wire.

4. The liquid heater using swirl according to claim 3, characterized in that: The resistance wires are evenly distributed in a zigzag line shape along the axial direction on the inner wall of the semicircular heating plate.

5. The liquid heater using swirl according to claim 4, characterized in that: The insulating layer covers the entire inner wall of the heating plate, and the insulating layer adheres the resistance wire to the inner wall of the heating plate.

6. The liquid heater using swirl according to claim 5, characterized in that: The insulating layer is made of glass or ceramic material, and is covered on the surface of the resistance wire by thick film screen printing or thermal spraying to seal the resistance wire inside.

7. The liquid heater using swirl according to claim 6, characterized in that: The wires are led out from the insulating layer.

Images