Electromagnetic heat exchanger for fluid

Abstract

The present invention discloses an electromagnetic heat exchanger for fluid, which includes: at least two heating baffles, which are installed on the mounting shaft along the circumferential direction, and each heating baffle is arranged along the radial direction of the mounting shaft to form a heating channel for air flow; an insulating sleeve, which is sleeved on the outside of the at least two heating baffles, and its outer surface is wrapped with an insulation layer; an electromagnetic coil, which is wound on the outer surface of the insulation layer; a fluid preheating sleeve, which has a low-temperature fluid inlet, and the at least two heating baffles, the insulating sleeve, and the electromagnetic coil are contained in the fluid preheating sleeve, wherein the fluid is sucked into the fluid preheating sleeve from the outside through the low-temperature fluid inlet to be preheated, and the preheated fluid enters the insulation sleeve for heating. The electromagnetic heater has a simple structure and is easy to maintain. It can increase the heat exchange area, increase the heat exchange time, strengthen the convective heat exchange between the fluid and the heating element, and make the low-temperature fluid efficiently and evenly heated.

Description

Technical Field

[0001] The invention relates to an electromagnetic heat exchanger for fluid, in particular to a high-efficiency electromagnetic heat exchanger for fluid. Background Art

[0002] Electromagnetic heating technology has been increasingly widely used due to its advantages of no pollution to the environment, high thermal efficiency, and easy automation control. With the implementation of the coal-to-electricity policy, coal-fired boilers have been gradually replaced, and electromagnetic heating technology has been increasingly used in the preparation of high-temperature fluids for industrial and domestic use. Fluid electromagnetic heat exchangers use electromagnetic induction to heat the heating element itself, and then exchange heat with the low-temperature fluid and heat it to a specified temperature for use in specific applications.

[0003] The heat exchange efficiency between the heating element of the electromagnetic heat exchanger and the heated fluid affects the thermal efficiency of the heat exchanger to a certain extent, and the flow pattern of the low-temperature fluid in the electromagnetic heat exchanger directly affects the heat exchange efficiency between the fluid and the heating element. Therefore, the design of the fluid flow channel with the heating element installed in the electromagnetic heat exchanger is particularly important.

[0004] When the electromagnetic heat exchanger is working, there will be a certain amount of heat leakage from the insulation layer close to the coil, causing the coil temperature to rise. When the temperature of the electromagnetic coil is too high, it will seriously affect the normal operation of the electromagnetic coil and even burn the coil. Therefore, the cooling of the electromagnetic coil in the design of the electromagnetic heat exchanger cannot be ignored. Summary of the invention

[0005] The present invention proposes an electromagnetic heat exchanger for fluid, which can preheat the low-temperature fluid and then pass through multiple heating channels in sequence to be fully heated, thereby improving the heat exchange efficiency between the heating element and the low-temperature fluid, allowing the low-temperature fluid to be heated efficiently and evenly, while the electromagnetic coil is cooled, thereby extending the service life of the electromagnetic coil.

[0006] The electromagnetic heat exchanger for fluid includes at least two heating baffles, which are installed on the mounting shaft along the circumferential direction, and each heating baffle is arranged along the radial direction of the mounting shaft to form a heating channel for air flow; an insulating sleeve, which is sleeved on the outside of the at least two heating baffles, and the outside of the insulating sleeve is wrapped with a thermal insulation layer of a certain thickness; an electromagnetic coil, which is wound on the surface of the outer thermal insulation layer of the insulating sleeve; a fluid preheating sleeve, which has a low-temperature fluid inlet, and the at least two heating baffles, the insulating sleeve, and the electromagnetic coil are accommodated in the fluid preheating sleeve, wherein the fluid is sucked into the fluid preheating sleeve from the outside through the low-temperature fluid inlet to be preheated, and the preheated fluid enters the insulating sleeve to be heated.

[0007] The insulating sleeve may include a first end cover and a second end cover covering its two ends, a fluid inlet and a fluid outlet are formed on the first end cover and / or the second end cover, the at least two heating baffles include a channel baffle, the channel baffle separates the fluid inlet and the fluid outlet, and gaps alternately exist between the other heating baffles except the channel baffle and the first end cover and the second end cover along the circumferential direction.

[0008] The number of the at least two heating baffles may be an odd number, and the fluid inlet and the fluid outlet are formed on the first end cover and the second end cover, respectively.

[0009] The number of the at least two heating baffles may be an even number, and the fluid inlet and the fluid outlet are both formed on the first end cover or are both formed on the second end cover.

[0010] The installation shaft may extend to an outer side of the insulating sleeve, and the fluid preheating sleeve is installed on the installation shaft.

[0011] The outer side of the insulating sleeve is wrapped with a heat-insulating layer, and the electromagnetic coil is wound on the heat-insulating layer.

[0012] The fluid preheating sleeve may be made of an electromagnetic shielding composite material to prevent electromagnetic leakage.

[0013] The fluid preheating sleeve can be made of aluminum, and manganese-zinc magnetic blocks are evenly adhered to the outer side of the shell made of aluminum.

[0014] The electromagnetic heat exchanger according to the embodiment of the present invention forms multiple heating channels with the heating baffle and the insulating sleeve, thereby increasing the heat exchange area, increasing the heat exchange time, and strengthening the convective heat exchange between the fluid and the heating element, so that the low-temperature fluid can be heated efficiently and evenly.

[0015] In addition, the low-temperature fluid from the outside first enters the fluid preheating sleeve, and can cool the electromagnetic coil while being preheated itself.

[0016] The electromagnetic heat exchanger according to the embodiment of the present invention can be applied to grain drying, heating, etc. through connecting pipelines and subsequent equipment. The electromagnetic heater device has a simple structure and is easy to maintain. The size, number of coil turns, and number of heating baffles can be adjusted according to specific application occasions to change the fluid temperature between tens of degrees and hundreds of degrees. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 3 is a schematic structural diagram of a high-efficiency electromagnetic heat exchanger for fluid according to an embodiment of the present invention (the number of partitions is 5).

[0018] Figure 2 are respectively along Figure 1 Schematic diagram of cross sections taken at AA, BB and CC.

[0019] Figure 3 It is a schematic diagram of the flow pattern of the fluid in the heating channel of the high-efficiency electromagnetic heat exchanger device for fluid according to an embodiment of the present invention.

[0020] Figure 4 It is a schematic structural diagram of a high-efficiency electromagnetic heat exchanger device for fluid according to another embodiment of the present invention (the number of partitions is 6).

[0021] Figure 5 are respectively along Figure 4 Schematic diagram of cross-sections taken at AA, BB and CC.

[0022] Figure 6 It is a schematic diagram of the flow pattern of the fluid in the heating channel of the high-efficiency electromagnetic heat exchanger device for fluid according to another embodiment of the present invention.

[0023] In the figure: 1-heating baffle, 2-insulating sleeve, 3-electromagnetic coil, 4-fluid preheating sleeve, 1-1-short side of heating baffle, 1-2-long side of heating baffle, 2-1-low-temperature fluid inlet on insulating sleeve, 2-2-high-temperature fluid outlet on insulating sleeve, 2-3-first end cover of insulating sleeve, 2-4-second end cover of insulating sleeve, 4-1-fluid preheating sleeve inlet, 5-installing shaft. DETAILED DESCRIPTION

[0024] The following describes a high-efficiency electromagnetic heat exchanger device for fluid according to the present invention with reference to the accompanying drawings.

[0025] It should be noted that in the following description, the radial, axial and circumferential directions are defined under the assumption that the mounting shaft is cylindrical in shape. Therefore, when the radial, axial and circumferential directions are mentioned below, they refer to the radial, axial and circumferential directions of the mounting shaft.

[0026] According to an embodiment of the present invention, the electromagnetic heat exchanger for fluid comprises at least two heating baffles 1, an insulating sleeve 2, an electromagnetic coil 3, and a fluid preheating sleeve 4, wherein at least two heating baffles 1 are mounted on a mounting shaft 5 in a circumferential direction, and each heating baffle 1 is arranged radially to form a heating channel, the insulating sleeve 2 is sleeved on the outside of the at least two heating baffles 1, the outside of the insulating sleeve 2 is wrapped with an insulating layer, the electromagnetic coil 3 is wound on the outer surface of the insulating layer of the insulating sleeve 2, the fluid preheating sleeve 4 accommodates the at least two heating baffles 1, the insulating sleeve 2, and the electromagnetic coil 3 therein and has a low-temperature fluid inlet 4-1, the fluid sucked from the outside enters the fluid preheating sleeve 4 through the low-temperature fluid inlet 4-1, the preheated fluid enters the insulating sleeve 3, and when high-frequency alternating current is passed through the electromagnetic coil 3, the fluid is heated by the induced current generated in the heating baffle 1 while flowing along the heating channel.

[0027] The insulating sleeve 2 may be made of multiple layers of glass fiber and phenolic resin, and may include a first end cap 2-3 and a second end cap 2-4 covering the ends thereof, a fluid inlet 2-1 and a fluid outlet 2-2 are formed on the first end cap 2-3 and / or the second end cap 2-4, and one of the at least two heating baffles 1-1 separates the fluid inlet 2-1 and the fluid outlet 2-2 to separate the inlet fluid from the outlet fluid, and the heating baffle is called a channel baffle. The heating baffle 1 is in the shape of a rectangular plate and is in close contact with the inner wall of the insulating sleeve 2, and the remaining heating baffles except the channel baffle have gaps alternately between the first end cap 2-3 and the second end cap 2-4 in the circumferential direction to form a heating channel.

[0028] The mounting shaft 5 extends to the outside of the insulating sleeve 2 so that the fluid preheating sleeve 4 can be mounted on the mounting shaft 5. The structure of the mounting shaft 5 is not limited as long as the heating baffle 1, the first end cover 2-3, the second end cover 2-4 and the fluid preheating sleeve 4 can be mounted thereon.

[0029] The at least two heating baffles 1 can be made of materials with good magnetic and thermal conductivity. For example, the material of the heating baffle 1 can be carbon steel. In addition, the number of heating baffles 1 can be determined according to needs. Accordingly, the positions of the fluid inlet 2-1 and the fluid outlet 2-2 are changed according to the number of heating baffles 1. Figures 1 to 3 When the number of partitions is an odd number (the number of partitions is 5), the fluid inlet 2-1 and the fluid outlet 2-2 are on different sides, that is, the fluid inlet 2-1 and the fluid outlet 2-2 are formed on the first end cover 2-3 and the second end cover 2-4 respectively. Figures 4 to 6 When the number of partitions is an even number (the number of partitions is 6), the fluid inlet 2-1 and the fluid outlet 2-2 are on the same side, that is, the fluid inlet 2-1 and the fluid outlet 2-2 are simultaneously formed on the first end cover 2-3 or simultaneously formed on the second end cover 2-4.

[0030] The insulating sleeve 2 is wrapped with an insulation layer (not shown) on the outside, and the electromagnetic coil 3 is wound outside the insulation layer. The insulation layer insulates the internal fluid and the heating partition 1 while reducing the heat transfer to the electromagnetic coil 3 to prevent the electromagnetic coil from overheating.

[0031] A channel for fluid to pass through for preheating the fluid and cooling the electromagnetic coil 3 is formed between the fluid preheating sleeve 4 and the insulating sleeve 2, that is, a predetermined space is formed between the fluid preheating sleeve 4 and the insulating sleeve 2. The fluid preheating sleeve 4 is made of electromagnetic shielding composite material to prevent electromagnetic leakage.

[0032] The low-temperature fluid inlet 4-1 of the electromagnetic heat exchanger can be connected to various forms of fluid conveying equipment, and the high-temperature fluid outlet 2-2 can be connected to various forms of heat-using fluid equipment.

[0033] When the electromagnetic heat exchanger according to the present invention is working, the low-temperature fluid first enters the fluid preheating sleeve 4 through the low-temperature fluid inlet 4-1 of the fluid preheating sleeve 4, and exchanges heat with the electromagnetic coil 3. On the one hand, the low-temperature fluid is preheated, and on the other hand, the electromagnetic coil 3 is cooled; the preheated low-temperature fluid enters the heating channel between the heating partition 1 and the insulating sleeve 2 in turn, which increases the heat exchange area, increases the flow time of the low-temperature fluid in the heating channel, enhances the convective heat exchange between the low-temperature fluid and the heating partition, and makes the low-temperature fluid efficiently and evenly heated.

[0034] In addition, the electromagnetic heat exchanger can adjust the size and shape of the cross section, heating power, etc. according to actual needs. For example, in addition to the cylindrical shape shown in the drawings, the insulating sleeve can also have a cubic shape, a prism shape, etc.

[0035] The electromagnetic heat exchanger according to the embodiment of the present invention can be applied to grain drying, heating, etc. through connecting pipelines and subsequent equipment. The electromagnetic heater device has a simple structure and is easy to maintain. The size, number of coil turns, and number of heating baffles can be adjusted according to specific application occasions to change the fluid temperature between tens of degrees and hundreds of degrees.

[0036] The above-mentioned implementation modes are only descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by engineers and technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. An electromagnetic heat exchanger for fluid, characterized in that: The electromagnetic heat exchanger comprises: At least two heating baffles are mounted on the mounting shaft along a circumferential direction, and each heating baffle is arranged along a radial direction of the mounting shaft to form a heating channel for air flow; An insulating sleeve, which is sleeved on the outside of the at least two heating baffles and has an outer surface wrapped with a heat-insulating layer; An electromagnetic coil is wound around the outer surface of the thermal insulation layer; The fluid preheating sleeve has a low-temperature fluid inlet, and the at least two heating baffles, the insulating sleeve, and the electromagnetic coil are accommodated in the fluid preheating sleeve. The fluid is sucked into the fluid preheating sleeve from the outside through the low-temperature fluid inlet to be preheated, and the preheated fluid enters the insulating sleeve to be heated; and the outer side of the insulating sleeve is wrapped with an insulation layer, and the electromagnetic coil is wound on the insulation layer; The insulating sleeve comprises a first end cap and a second end cap covering two ends thereof, a fluid inlet and a fluid outlet are formed on the first end cap and / or the second end cap, the at least two heating baffles comprise a channel baffle, the channel baffle separates the fluid inlet and the fluid outlet, and gaps are alternately formed between the other heating baffles except the channel baffle and the first end cap and the second end cap along the circumferential direction, and Wherein, the at least two heating baffles include five or six heating baffles, when the number of the at least two heating baffles is five, the fluid inlet and the fluid outlet are respectively formed on the first end cover and the second end cover, and when the number of the at least two heating baffles is six, the fluid inlet and the fluid outlet are both formed on the first end cover or both formed on the second end cover, and Wherein, the heating baffle is made of a material with good magnetic and thermal conductivity.

2. The electromagnetic heat exchanger for fluid according to claim 1, characterized in that: The fluid preheating sleeve is made of aluminum, and manganese-zinc magnetic blocks are evenly adhered to the outer side of the shell made of aluminum.

3. The electromagnetic heat exchanger for fluid according to claim 1, characterized in that: The installation shaft extends to the outside of the insulating sleeve, and the fluid preheating sleeve is installed on the installation shaft.

4. The electromagnetic heat exchanger for fluid according to claim 1, characterized in that: The fluid preheating sleeve is made of an electromagnetic shielding composite material to prevent electromagnetic leakage.

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