A liquid heater using eddy current

Abstract

The utility model discloses a liquid heater utilizing eddy current, comprising a heating cylinder, a heating plate, a swirl disk, a liquid inlet pipe and a liquid outlet pipe, the heating cylinder is a flat hollow cylindrical structure, the heating cylinder comprises a cylinder, and a first top plate and a second top plate welded at two ends of the cylinder, the first top plate core is connected with the liquid inlet pipe, the second top plate core is connected with the liquid outlet pipe, a heating plate is arranged in the heating cylinder, the heating plate is arranged parallel to the first top plate and the second top plate, the circumference of the heating plate is fixedly welded to the inner wall of the cylinder, the heating plate core is provided with a liquid outlet through hole, the inner port of the liquid outlet pipe is welded and connected with the liquid outlet through hole; the heating plate divides the heating cylinder into two cavities, the cavity is between the heating plate and the second top plate, the common heating cavity is between the heating plate and the first top plate, the swirl disk is arranged in the common heating cavity, and a swirl heating cavity is arranged between the swirl disk and the heating plate; the utility model can effectively improve the heat exchange efficiency.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile heat exchangers, and in particular relates to a liquid heater utilizing eddy currents. Background Art

[0002] Liquid heaters play an important role in the thermal management system of electric vehicles. After the coolant is heated by the liquid heater, it is usually used to heat components such as battery packs, motors, inverters, etc. In cold weather, the temperature of the battery and other key components of electric vehicles can affect battery performance and vehicle efficiency. Liquid heaters can help increase the operating temperature of the battery, reduce energy loss during cold start, and avoid the impact of low temperature on battery life, ensuring that the vehicle can perform well in different climate conditions.

[0003] The existing liquid heater heats the coolant flowing through it by arranging a heating plate in the heating chamber. Liquid inlets and outlets are respectively arranged at both ends of the heating chamber. The coolant flows in from the liquid inlet and flows out from the liquid outlet after being heated. Due to the lack of diversion and drainage structures in the heating chamber, there is an obvious boundary layer in the flow of the coolant, and heat is transferred from the heating plate to the coolant in a step-down state. Therefore, the heating efficiency of the coolant is low, the heating is uneven, and the outflowing coolant is prone to uneven temperature, large temperature difference, and uneven heating temperature. Therefore, it is necessary to improve the existing liquid heater. Utility Model Content

[0004] In response to the above-mentioned problems and technical needs, the utility model provides a liquid heater utilizing vortex. By setting a layer of swirl structure in the heating chamber, a vortex can be created in the heating chamber and the vortex speed can be accelerated to disturb the flow of the fluid, increase the turbulence intensity of the fluid, weaken the boundary layer of the fluid, and ultimately improve the heat exchange efficiency.

[0005] The technical scheme of the utility model is as follows: a liquid heater utilizing eddy current, comprising a heating cylinder, a heating plate, a swirl disk, a liquid inlet pipe and a liquid outlet pipe, the heating cylinder being a flat hollow cylindrical structure, the heating cylinder comprising a cylinder, and a first top plate and a second top plate welded at both ends of the cylinder, the first top plate core being connected to a liquid inlet pipe, the second top plate core being connected to a liquid outlet pipe, a heating plate being arranged in the heating cylinder, the heating plate being arranged parallel to the first top plate and the second top plate, the circumference of the heating plate being fixedly welded on the inner wall of the cylinder, a liquid outlet through hole being arranged in the core of the heating plate, and an inner port of the liquid outlet pipe being welded and connected to the liquid outlet through hole; the heating plate divides the heating cylinder into two cavities, a cavity is provided between the heating plate and the second top plate, a common heating cavity is provided between the heating plate and the first top plate, the swirl disk is arranged in the common heating cavity, a swirl heating cavity is provided between the swirl disk and the heating plate, liquid flows from the liquid inlet pipe into the common heating cavity, and then flows from the common heating cavity into the swirl heating cavity, and the heated liquid flows out from the liquid outlet pipe through the liquid outlet through hole.

[0006] In the above scheme, the liquid to be heated flows into the common heating chamber through the liquid inlet pipe, and the heating plate only heats the liquid flow in the common heating chamber. The other side of the heating plate is a cavity, which can block heat loss, so that the heating plate has a higher heating efficiency for the liquid flow; the liquid flow entering the swirl heating chamber from the common heating chamber further generates vortices, which disturb the flow of the fluid, increase the turbulence intensity of the fluid, and cause the fluid to be continuously mixed in the swirl heating chamber, thereby weakening the boundary layer of the fluid on the surface of the heating plate, promoting better contact between the fluid and the heat exchange surface, and improving the heat transfer efficiency of the heating plate.

[0007] Furthermore, the swirl disk includes a swirl plate and a baffle plate. The baffle plate is arranged in parallel between the first top plate and the heating plate. The baffle plate is a circular plate with a diameter smaller than the inner diameter of the cylinder. The baffle plate and the heating plate are fixedly connected by a circle of swirl plates. The baffle plate, swirl plates and the heating plate constitute a swirl heating chamber.

[0008] When the liquid flow is injected into the common heating chamber from the liquid inlet pipe, the liquid flow first hits the baffle plate, and the baffle plate breaks up the liquid flow, so that the liquid flow flows from the center to the outside along the baffle plate, and finally flows into the swirl heating chamber from the edge of the baffle plate. The baffle plate can extend the flow path of the liquid flow and increase the heat exchange time; and the baffle plate is connected to the heating plate through the swirl plate, part of the heat of the heating plate is radiated to the baffle plate, and the other part of the heat of the heating plate is directly transferred to the baffle plate through the swirl plate. Therefore, the baffle plate itself has a certain amount of heat, and the liquid flow can be preliminarily heated by the baffle plate when flowing on the baffle plate.

[0009] Furthermore, multiple swirl plates are arranged at equal intervals around the center of the baffle plate. The swirl plates are curved. The width of the swirl plates gradually increases from the outer end to the inner end. A guide channel is formed between each two adjacent swirl plates. The width of the guide channel gradually narrows from the edge of the heating plate to the inside. The liquid flow flowing from the outside to the inside through the guide channel forms a vortex and finally flows out from the liquid outlet hole.

[0010] Furthermore, the liquid flowing inward through the guide channel moves centripetally around the center of the heating plate, and the movement trajectory of the liquid flow is a spiral curve.

[0011] In the above scheme, the liquid flows inward from the guide channel, and the width of the guide channel is wide on the outside and narrow on the inside. Therefore, the liquid flow is accelerated when passing through the guide channel, which increases the flow speed of the vortex rotating around the center of the heating plate, thereby increasing the heat convection exchange coefficient between the fluid and the heating plate and enhancing the heat exchange effect; all guide channels can be uniformly regarded as a circle of inward-rotating flow channels. When the liquid to be heated with turbulent flow direction enters the vortex heating chamber from the edge of the heating plate, the liquid is transformed into a vortex form rotating around the center of the heating plate on the inner side of the vortex plate through the action of the inward-rotating flow channel, and the heating plate heats the vortex at the same time.

[0012] The role of multiple swirl plates arranged around the center of the heating plate is that the swirl plates are directly connected to the heating plate, and the heat of the heating plate is directly transferred to the swirl plates, which is equivalent to further increasing the heat exchange area for direct heating of the liquid flow and further improving the heat exchange efficiency.

[0013] Furthermore, the heating plate is provided with a resistance wire, which is evenly distributed on the surface of the heating plate in a spiral, and electrodes are provided on both sides of the resistance wire. Slots are provided on both sides of the cylinder, and an external cable is inserted into the slot from the outside to the inside. The external cable is connected to the electrode, and the external cable is energized to radiate heat. The resistance wire is attached to the surface of the heating plate in a spiral evenly distributed manner, and can evenly heat all areas of the surface of the heating plate, and the heating effect is more uniform.

[0014] Furthermore, the surface of the resistance wire is printed and covered with an insulating layer, the insulating layer is made of ceramic or glass, the insulating layer encapsulates the resistance wire and adheres it to the surface of the heating plate, the insulating layer is sealed at the slot, and the external cable passes through the insulating layer and is connected to the electrode. The resistance wire adopts a thick film process to print and cover the insulating layer on the surface, so as to realize the encapsulation of the resistance heating element, and at the same time, the resistance wire is adhered to the heating plate by a physical vapor deposition (PVD) or chemical vapor deposition (CVD) insulating layer method, so that the resistance wire evenly dissipates heat after power is turned on.

[0015] Furthermore, the diameter of the liquid outlet pipe is smaller than the diameter of the liquid inlet pipe.

[0016] Beneficial effects of the utility model:

[0017] 1. A swirl heating chamber is set in the ordinary heating chamber. When the liquid flow enters the heater from the liquid inlet pipe, it first impacts the surface of the baffle plate, and the baffle plate can heat the liquid flow for the first time;

[0018] 2. Blocked by the baffle plate, the liquid flows to the edge of the baffle plate and enters the swirl heating chamber through a circle of swirl sheets from the edge. The swirl heating chamber is closer to the heating plate, so the heat in the swirl heating chamber is higher. The heating plate transfers the heat to a circle of swirl sheets, which increases the heat exchange area and improves the heat exchange efficiency.

[0019] 3. The liquid flow forms eddies in the swirl-heating chamber. The eddies disturb the flow of the fluid, increase the turbulence intensity of the fluid, and cause changes in the velocity and pressure of the fluid, so that the fluid is continuously mixed in the swirl-heating chamber, thereby weakening the boundary layer of the fluid on the surface of the heating plate, promoting better contact between the fluid and the heat exchange surface, and improving the heat transfer efficiency between the liquid and the heating plate;

[0020] 4. The width of the guide channel gradually narrows from the edge of the heating plate inward, so that the liquid flows inward and is accelerated when passing through the guide channel, thereby increasing the flow speed of the eddy current rotating around the center of the heating plate, thereby increasing the heat convection exchange coefficient between the fluid and the heating plate and enhancing the heat exchange effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is the external structure diagram of the liquid heat exchanger of the utility model;

[0022] Figure 2 This is a cross-sectional structural diagram of the liquid heat exchanger of the utility model;

[0023] Figure 3 It is a flow path diagram of the liquid flow in the liquid heat exchanger of the utility model;

[0024] Figure 4 The structure of the inner side of the spoiler Figure 1 ;

[0025] Figure 5 The structure of the inner side of the spoiler Figure 2 ;

[0026] Figure 6 The layout diagram of the resistance wire on the heating plate;

[0027] Figure 7 Schematic diagram of the connection relationship of the resistance wire;

[0028] Marked in the figure are: heating cylinder 1, cylinder 11, slot 111, first top plate 12, liquid inlet pipe 121, second top plate 13, liquid outlet pipe 131, heating plate 2, resistance wire 21, insulating layer 22, swirl disk 3, swirl sheet 31, guide channel 311, baffle 32, cavity 4, ordinary heating chamber 5, swirl heating chamber 6, external cable 7. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0030] like Figure 1-7The utility model is a liquid heater using eddy current, comprising a heating cylinder 1, a heating plate 2, a swirl disk 3, a liquid inlet pipe 121 and a liquid outlet pipe 131. The heating cylinder 1 is a flat hollow cylindrical structure. The heating cylinder 1 comprises a cylinder 11, and a first top plate 12 and a second top plate 13 welded at both ends of the cylinder 11. The core of the first top plate 12 is connected to the liquid inlet pipe 121, and the core of the second top plate 13 is connected to the liquid outlet pipe 131. The heating cylinder 1 is provided with a heating plate 2, and the heating plate 2 is arranged parallel to the first top plate 12 and the second top plate 13. The circumference of the heating plate 2 is fixedly welded to On the inner wall of the cylinder, the core of the heating plate 2 is provided with a liquid outlet hole, and the inner port of the liquid outlet pipe 131 is welded and connected to the liquid outlet hole; the heating plate 2 divides the heating cylinder 1 into two cavities, and there is a cavity 4 between the heating plate 2 and the second top plate 13, and an ordinary heating chamber 5 between the heating plate 2 and the first top plate 12. The swirl disk 3 is arranged in the ordinary heating chamber 5, and a swirl heating chamber 6 is provided between the swirl disk 3 and the heating plate 2. The liquid flows into the ordinary heating chamber 5 from the liquid inlet pipe 121, and then flows into the swirl heating chamber 6 from the ordinary heating chamber 5. The heated liquid flows out from the liquid outlet pipe 131 through the liquid outlet hole.

[0031] The fluid will generate eddy currents in the swirl heating chamber 6. The principle of eddy current heat exchange is based on two main factors: the generation of eddy currents and the enhancement of mixing between the fluid and the pipe wall, which can be achieved by introducing a spiral flow pattern in the fluid. When the fluid forms a spiral flow in the pipe, vortices are generated in the fluid. These vortices disturb the flow of the fluid and cause changes in the velocity and pressure of the fluid. This flow pattern causes the fluid to be continuously mixed in the pipe, thereby better contacting the fluid with the heat exchange surface. This contact increases the heat transfer surface area between the fluid and the heat exchange surface, thereby improving the heat transfer efficiency. The principle of eddy current heat exchange is also related to the generation of turbulence. Spiral flow often causes turbulent motion inside the fluid, and turbulence can further enhance heat transfer. Turbulent flow makes the temperature in the fluid more uniform, thereby reducing the temperature gradient and promoting faster heat transfer.

[0032] The swirl disk 3 includes a swirl plate 31 and a baffle plate 32. The baffle plate 32 is arranged in parallel between the first top plate 12 and the heating plate 2. The baffle plate 32 is a circular plate with a diameter smaller than the inner diameter of the cylinder. The baffle plate 32 and the heating plate 2 are fixedly connected by a circle of swirl plates 31. The baffle plate 32, the swirl plate 31 and the heating plate 2 constitute a swirl heating chamber 6. A plurality of swirl plates 31 are arranged equidistantly around the center of the baffle plate 32. The swirl plates 31 are curved. The width of the swirl plates 31 gradually increases from the outer end to the inner end. A guide channel 311 is formed between each two adjacent swirl plates 31. The width of the guide channel 311 gradually narrows from the edge of the heating plate inward. The liquid flow flowing from the outside to the inside through the guide channel 311 forms a vortex and finally flows out from the liquid outlet hole. The liquid flow flowing inward through the guide channel 311 moves centripetally around the center of the heating plate 2, and the movement trajectory of the liquid flow is a spiral curve.

[0033] The heating plate 2 is provided with a resistance wire 21, which is evenly distributed on the surface of the heating plate 2 in a spiral manner. Electrodes are provided on both sides of the resistance wire 21. Slots 111 are provided on both sides of the cylinder. An external cable 7 is inserted from the outside to the inside of the slot 111. The external cable 7 is connected to the electrode. The external cable 7 energizes the resistance wire 21 so that the resistance wire 21 emits heat. The resistance wire 21 is attached to the surface of the heating plate 2 in a spirally evenly distributed manner, which can evenly heat all areas of the surface of the heating plate 2, and the heating effect is more uniform. The surface of the resistance wire 21 is printed and covered with an insulating layer 22, which is made of ceramic or glass. The insulating layer 22 encapsulates the resistance wire and adheres it to the surface of the heating plate 2. The insulating layer 22 is blocked at the slot 111, and the external cable 7 passes through the insulating layer 22 to connect with the electrode. The diameter of the liquid outlet pipe 131 is smaller than the diameter of the liquid inlet pipe 121.

[0034] The application principle of the utility model is as follows: when the liquid flow is injected into the common heating chamber 5 from the liquid inlet pipe 121, the liquid flow first hits the baffle plate 32, and the baffle plate 32 breaks up the liquid flow, so that the liquid flow flows from the center to the outside along the baffle plate 32, and finally flows into the swirl heating chamber 6 from the edge of the baffle plate 32. The baffle plate 32 can extend the flow path of the liquid flow and increase the heat exchange time; and the baffle plate 32 is connected to the heating plate 2 through the swirl plate 31, and part of the heat of the heating plate 2 is radiated to the baffle plate 32, and another part of the heat of the heating plate 2 is directly transferred to the baffle plate 32 through the swirl plate 31. Therefore, the baffle plate 32 itself has a certain amount of heat, and when the liquid flow flows on the baffle plate 32, it can be heated by the baffle plate 32 for the first time. After the first heating, the liquid flows inward from the guide channel 311. The width of the guide channel 311 is wide outside and narrow inside. Therefore, the liquid is accelerated when passing through the guide channel 311, which increases the flow speed of the vortex rotating around the center of the heating plate, thereby increasing the heat convection exchange coefficient between the fluid and the heating plate and enhancing the heat exchange effect. All guide channels 311 can be uniformly regarded as a circle of inward-rotating flow channels. When the liquid to be heated with turbulent flow enters the vortex heating chamber 6 from the edge of the heating plate 2, the liquid is transformed into a vortex shape rotating around the center of the heating plate on the inner side of the vortex plate 31 through the action of the inward-rotating flow channel. The heating plate 2 heats the vortex for the second time at the same time. The vortex plate 31 is directly connected to the heating plate 2, and the heat of the heating plate 2 is directly transferred to the vortex plate 31, which is equivalent to further increasing the heat exchange area for direct heating of the liquid flow, further improving the heat exchange efficiency, and the vortex that completes the second heating flows out through the liquid outlet pipe 131.

[0035] 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 eddy current, characterized in that: The invention comprises a heating cylinder, a heating plate, a swirl disk, a liquid inlet pipe and a liquid outlet pipe, wherein the heating cylinder is a flat hollow cylindrical structure, the heating cylinder comprises a cylinder, and a first top plate and a second top plate welded at two ends of the cylinder, the core of the first top plate is connected with a liquid inlet pipe, the core of the second top plate is connected with a liquid outlet pipe, a heating plate is arranged in the heating cylinder, the heating plate is arranged parallel to the first top plate and the second top plate, the circumference of the heating plate is fixedly welded on the inner wall of the cylinder, a liquid outlet through hole is arranged in the core of the heating plate, and the inner port of the liquid outlet pipe is welded and connected with the liquid outlet through hole; the heating plate divides the heating cylinder into two cavities, the cavity is between the heating plate and the second top plate, the common heating cavity is between the heating plate and the first top plate, the swirl disk is arranged in the common heating cavity, a swirl heating cavity is arranged between the swirl disk and the heating plate, liquid flows into the common heating cavity from the liquid inlet pipe, and then flows into the swirl heating cavity from the common heating cavity, and the heated liquid flows out from the liquid outlet pipe through the liquid outlet through hole.

2. A liquid heater using eddy current according to claim 1, characterized in that: The swirl disk includes a swirl sheet and a baffle plate. The baffle plate is arranged in parallel between the first top plate and the heating plate. The baffle plate is a circular plate with a diameter smaller than the inner diameter of the cylinder. The baffle plate and the heating plate are fixedly connected by a circle of swirl sheets. The baffle plate, the swirl sheet and the heating plate constitute a swirl heating chamber.

3. A liquid heater using eddy current according to claim 2, characterized in that: Multiple swirl plates are arranged at equal intervals around the center of the baffle plate. The swirl plates are curved. The width of the swirl plates gradually increases from the outer end to the inner end. A guide channel is formed between every two adjacent swirl plates. The width of the guide channel gradually narrows from the edge of the heating plate to the inside. The liquid flow flowing from the outside to the inside through the guide channel forms a vortex and finally flows out from the liquid outlet hole.

4. The liquid heater using eddy current according to claim 3, characterized in that: The liquid flow flowing inward through the guide channel moves centripetally around the center of the heating plate, and the movement trajectory of the liquid flow is a spiral curve.

5. The liquid heater using eddy current according to claim 4, characterized in that: The heating plate is provided with a resistance wire, which is coiled and evenly distributed on the surface of the heating plate. Electrodes are provided on both sides of the resistance wire. Slot holes are correspondingly opened on both sides of the cylinder. External cables are inserted into the slot holes from the outside to the inside. The external cables are connected to the electrodes. The external cables energize the resistance wire to make the resistance wire emit heat.

6. The liquid heater using eddy current according to claim 5, characterized in that: The surface of the resistance wire is printed and covered with an insulating layer, which is made of ceramic or glass. The insulating layer adheres the resistance wire package to the surface of the heating plate, the insulating layer is sealed at the slot, and the external cable passes through the insulating layer to connect with the electrode.

7. The liquid heater using eddy current according to claim 6, characterized in that: The diameter of the liquid outlet pipe is smaller than the diameter of the liquid inlet pipe.

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