Spiral disc electric heating device

Abstract

The invention relates to an electric heating device, in particular to a spiral disc electric heating device, which comprises a first electrode, a second electrode and a plurality of electric heating sheet groups, the plurality of electric heating sheet groups are sequentially arranged to form a certain length, the positions of the plurality of electric heating sheet groups are fixed, and the structures of the plurality of electric heating sheet groups are the same. Each electric heating piece set comprises a plurality of layers of electric heating pieces which are concentrically arranged, an annular containing space is formed between every two adjacent layers of electric heating pieces and used for containing a medium to be heated, and the different electric heating piece sets are connected in series or in parallel. One end of the first electrode is connected with the electric heating sheet group at the head, the other end is connected with a power supply anode, one end of the second electrode is connected with the electric heating sheet group at the tail, and the other end is connected with a power supply cathode. The large electric heating power can be achieved in the limited volume space, and the power density of the electric heating device is improved.

Description

Technical Field

[0001] The invention relates to an electric heating device, in particular to a spiral disc electric heating device. Background Art

[0002] Resistance heating uses the Joule effect of current flowing through a conductor to generate heat energy to heat an object. From the heating power formula, it can be seen that the size of the heating power is mainly related to the system current and resistance. The existing traditional resistance heating forms include PTC electric heating, finned tube electric heating and tubular electric heating, but the surface power load of traditional resistance heaters is generally small. According to the material of the resistance wire and the heat exchange with the heated medium, it is necessary to ensure that the surface load of the resistance heating is within a reasonable range. If the surface load of the resistance heater exceeds the design allowable range, the heat released by the heater will not be able to be transferred to the heated medium in time, resulting in the surface temperature rising, the resistance wire fusing and finally the heater burning. Existing resistance heating devices take into account factors such as insulation, medium reaction, and applicability. The heating element is generally encapsulated in a structural part, such as encapsulated in a stainless steel finned tube, encapsulated in a stainless steel tube, etc., and heat is transferred in the middle through a thermal conductor (such as magnesium oxide, etc.). The heat conduction efficiency is low and the heating time is long, which cannot directly meet the high-power electric heating needs. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a spiral disc type electric heating device which can realize a larger electric heating power in a limited volume space and improve the power density of the electric heating device.

[0004] In order to solve the above technical problems, this application provides the following technical solutions:

[0005] The spiral disc electric heating device of the present invention comprises a first electrode, a second electrode, and a plurality of electric heating plate groups, wherein the plurality of electric heating plate groups are arranged in sequence to form a certain length, the plurality of electric heating plate groups are fixed in position, and each of the electric heating plate groups has the same structure. The electric heating plate group comprises multiple layers of concentrically arranged electric heating plates, and an annular accommodating space is formed between two adjacent layers of the electric heating plates, and the annular accommodating space is used to accommodate a medium to be heated. Different electric heating plate groups are connected in series or in parallel with each other, one end of the first electrode is connected to the electric heating plate group located at the head, and the other end is used to connect to the positive electrode of a power supply, and one end of the second electrode is connected to the electric heating plate group located at the tail, and the other end is used to connect to the negative electrode of a power supply.

[0006] Furthermore, it also includes multiple fixing components, which are made of insulating material. The fixing components correspond one-to-one to the electric heating plate group. The fixing components are disc-shaped, and a plurality of concentric annular grooves are arranged on one side surface of the fixing components. The electric heating plate is installed in the annular grooves.

[0007] Furthermore, a boss is provided on the surface of the fixing component on the same side as the annular groove, and the boss protrudes axially from the surface. The boss is arranged close to the axis of the fixing component, and the annular groove is located at the periphery of the boss. The boss of one fixing component is fitted with a side of an adjacent fixing component facing away from the boss, so that a gap is left between two adjacent fixing components when they are fitted together.

[0008] Furthermore, the electric heating plate of each electric heating plate group is formed by bending a strip of material, each annular accommodating space is provided with a notch to form a non-closed ring, and the notches on each annular accommodating space are staggered along the radial direction from the inside to the outside.

[0009] Furthermore, it also includes a plurality of interlayer connecting sheets, each of which is connected between two adjacent groups of the electric heating sheet groups, so that the two groups of the electric heating sheet groups are connected in series or in parallel.

[0010] Furthermore, the interlayer connecting sheet and the electric heating sheet group are welded to each other.

[0011] Furthermore, it also includes an end cover, which is located on one side of the fixed component, and the end cover is made of insulating material. The first electrode and the second electrode are both columnar, and an axial through hole is provided at the axis of the fixed component. The end cover is provided with a first mounting hole and a second mounting hole, the first mounting hole is located at the axis, and the second mounting hole deviates from the axis. The first electrode passes through the axial through hole and the first mounting hole on each of the fixed components in sequence, and locking bolts are respectively provided at both ends of the first electrode, the second electrode is provided in the second mounting hole, and a locking bolt is provided at one end of the second electrode located outside the second mounting hole.

[0012] Furthermore, it also includes a first electrode connecting sheet and a second electrode connecting sheet, the first electrode connecting sheet is clamped between the electric heating sheet group located at the head and the first electrode, and the second electrode connecting sheet is clamped between the electric heating sheet group located at the tail and the second electrode, so that the first electrode is electrically connected to the electric heating sheet group located at the head, and the second electrode is electrically connected to the electric heating sheet group located at the tail.

[0013] Furthermore, the second mounting hole is a countersunk hole.

[0014] Furthermore, the end cover is provided with a via hole, and the interlayer connecting sheet passes through the via hole and is connected to the electric heating sheet.

[0015] Compared with the prior art, the spiral disc type electric heating device of the present invention has at least the following beneficial effects:

[0016] The present invention provides a spiral disk type electric heating device. Since the electric heating plate group includes multiple layers of concentrically arranged electric heating plates, an annular accommodating space is formed between two adjacent layers of electric heating plates. The annular accommodating space is used to accommodate the medium to be heated. Therefore, the heat dissipation area of ​​the electric heating plate is large, and the medium to be heated is clamped between the two layers of electric heating plates. The heat transfer area between the medium to be heated and the two layers of electric heating plates is large, the contact is sufficient, and there is no intermediate heat conduction link, so that the medium to be heated is heated more evenly. In a limited volume space, a larger electric heating power can be achieved, the power density of the electric heating device is improved, and it is conducive to miniaturization of the system. At the same time, since the electric heating plate group includes multiple layers of concentrically arranged electric heating plates, electric heating plates of sufficient length can be accommodated in a limited space, further improving the power density of the electric heating device.

[0017] The spiral disc type electric heating device of the present invention will be further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic cross-sectional structure diagram of the spiral disc type electric heating device of the present invention;

[0019] Figure 2 It is a schematic diagram of the three-dimensional structure of the spiral disc type electric heating device of the present invention;

[0020] Figure 3 It is a schematic diagram of the structure of the electric heating plate and the annular accommodation space in the spiral disc type electric heating device of the present invention;

[0021] Figure 4 It is a schematic diagram of the structure of the fixed component in the spiral disc type electric heating device of the present invention;

[0022] Figure 5 It is a side view of the end cover of the spiral disc type electric heating device of the present invention;

[0023] Figure 6 It is a cross-sectional view of the end cover of the spiral disc type electric heating device of the present invention. DETAILED DESCRIPTION

[0024] like Figure 1 , Figure 2 , Figure 3As shown, a spiral disc electric heating device of the present invention is used for directly heating an inert non-conductive fluid medium, such as liquid / supercritical carbon dioxide, etc., comprising a first electrode 11, a second electrode 12, and a plurality of electric heating plate groups 13, wherein the plurality of electric heating plate groups 13 are arranged in sequence to form a certain length, the plurality of electric heating plate groups 13 are fixed in position, and each electric heating plate group 13 has the same structure, and the electric heating plate group 13 comprises a plurality of concentrically arranged electric heating plates 131, and an annular accommodation space 132 is formed between two adjacent layers of electric heating plates 131, and the annular accommodation space 132 is used to accommodate the medium to be heated, and different electric heating plate groups 13 are connected in series or in parallel as required, and one end of the first electrode 11 is connected to the electric heating plate group 13 at the head, and the other end is used to connect to the positive electrode of the power supply, and one end of the second electrode 12 is connected to the electric heating plate group 13 at the tail, and the other end is used to connect to the negative electrode of the power supply. When in use, the spiral disc electric heating device of the present invention is placed in the medium to be heated, and the medium to be heated enters the annular accommodation space 132, and the power supply is turned on. In the spiral disk type electric heating device of the present invention, since the electric heating plate group 13 includes multiple layers of concentrically arranged electric heating plates 131, an annular accommodating space 132 is formed between two adjacent layers of electric heating plates 131, and the annular accommodating space 132 is used to accommodate the medium to be heated. Therefore, the heat dissipation area of ​​the electric heating plate 131 is large, and the medium to be heated is clamped between the two layers of electric heating plates 131. The medium to be heated is in direct contact with the two layers of electric heating plates 131, and the heat transfer area is large, the contact is sufficient, and there is no intermediate heat conduction link. In a limited volume space, a larger electric heating power can be achieved, the power density of the electric heating device is improved, which is conducive to miniaturization of the system and makes the medium to be heated more uniformly. At the same time, since the electric heating plate group 13 includes multiple layers of concentrically arranged electric heating plates 131, electric heating plates of sufficient length can be accommodated in a limited space, further improving the power density of the electric heating device.

[0025] Alternatively, if Figure 1 , Figure 4 As shown, it also includes a plurality of fixing components 15, each fixing component 15 is closely arranged and arranged in sequence, the fixing components 15 are made of insulating material, the fixing components 15 correspond to the electric heating plate group 13 one by one, the fixing components 15 are disc-shaped, and a plurality of concentric annular grooves 151 are arranged on one side surface of the fixing components 15, and the electric heating plate 131 is installed in the annular groove 151. Specifically, the fixing components 15 are made of ceramic material. The electric heating plate 131 is installed in the annular groove 151 of the fixing components 15, so that the electric heating plate group 13 is easy to fix.

[0026] Optionally, a boss 152 is further provided on the surface of the fixing component 15 on the same side as the annular groove 151. The boss 152 protrudes axially from the surface. The boss 152 is arranged close to the axis of the fixing component 15, and the annular groove 151 is located on the periphery of the boss 152. The fixing components 15 are closely arranged and arranged in sequence. The boss 152 of one fixing component 15 is in contact with the side of the adjacent fixing component 15 that is away from the boss 152, so that a gap is left between two adjacent fixing components 15 when they are in contact with each other, so that the heated medium can flow through the gap into different groups of electric heating plate groups 13.

[0027] Optionally, the electric heating sheet 131 of each electric heating sheet group 13 is formed by bending a strip of material, and each annular accommodation space 132 is provided with a notch 133 to form a non-closed ring, and the notches 133 on each annular accommodation space 132 are staggered from the inside to the outside in the radial direction. Specifically, the electric heating sheet 131 is bent from a strip of high-temperature alloy material to form a spiral disk-like shape, and a porous annular accommodation space 132 is formed between two adjacent layers of electric heating sheets 131, so that the medium to be heated can fully enter each annular accommodation space 132.

[0028] Optionally, a plurality of interlayer connecting sheets 14 are further included, each of which is connected between two adjacent groups of electric heating sheet groups 13, so that the two groups of electric heating sheet groups 13 are connected in series or in parallel. Specifically, the interlayer connecting sheets 14 are made of conductive material, and the interlayer connecting sheets 14 and the electric heating sheet groups 13 are welded to each other.

[0029] Alternatively, if Figure 1 , Figure 5 , Figure 6 As shown, it also includes an end cover 16, which is located at one side of the fixing component 15. The end cover 16 is made of insulating material. The first electrode 11 and the second electrode 12 are both columnar. An axial through hole 153 is provided at the axis of the fixing component 15. The end cover 16 is provided with a first mounting hole 161 and a second mounting hole 162. The first mounting hole 161 is located at the axis, and the second mounting hole 162 deviates from the axis. The first electrode 11 passes through the axial through hole 153 and the first mounting hole 161 on each fixing component 15 in sequence. The first electrode 11 is a screw structure. Locking bolts are respectively provided at both ends of the first electrode 11. The end cover 16, the fixing component 15 and the first electrode 11 are locked by locking nuts. The second electrode 12 is a screw structure. The second electrode 12 is arranged in the second mounting hole 162. A locking bolt is provided at one end of the second electrode 12 located outside the second mounting hole 162. The second electrode 12 and the end cover 16 are locked by locking nuts.

[0030] Optionally, it also includes a first electrode connecting sheet 17 and a second electrode connecting sheet 18, the first electrode connecting sheet 17 is clamped between the electric heating sheet group 13 located at the head and the first electrode 11, and the second electrode connecting sheet 18 is clamped between the electric heating sheet group 13 located at the tail and the second electrode 12, so that the first electrode 11 is electrically connected to the electric heating sheet group 13 located at the head, and the second electrode 12 is electrically connected to the electric heating sheet group 13 located at the tail.

[0031] Optionally, the second mounting hole 162 is a countersunk hole to facilitate the installation of a fixing nut of the second electrode 12 .

[0032] Optionally, a via hole 163 is provided on the end cover 16 , and the interlayer connecting sheet 14 passes through the via hole 163 to be connected to the electric heating sheet 131 .

[0033] The embodiments described above are merely descriptions of preferred implementation modes of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A spiral disc type electric heating device, characterized in that: The invention comprises a first electrode (11), a second electrode (12), and a plurality of electric heating plate groups (13); the plurality of electric heating plate groups (13) are arranged in sequence to form a certain length; the plurality of electric heating plate groups (13) are fixed in position; each of the electric heating plate groups (13) has the same structure; the electric heating plate group (13) comprises a plurality of concentrically arranged electric heating plates (131); an annular accommodation space (132) is formed between two adjacent layers of the electric heating plates (131); the annular accommodation space (132) is used to accommodate a medium to be heated; different electric heating plate groups (13) are connected in series or in parallel; one end of the first electrode (11) is connected to the electric heating plate group (13) at the head, and the other end is used to connect to the positive electrode of a power supply; one end of the second electrode (12) is connected to the electric heating plate group (13) at the tail, and the other end is used to connect to the negative electrode of a power supply.

2. The spiral disc type electric heating device according to claim 1, characterized in that: It also comprises a plurality of fixing components (15), wherein the fixing components (15) are made of insulating material, the fixing components (15) correspond one to one with the electric heating plate group (13), the fixing components (15) are disc-shaped, and a plurality of concentric annular grooves (151) are arranged on one side surface of the fixing components (15), and the electric heating plate (131) is installed in the annular grooves (151).

3. The spiral disc type electric heating device according to claim 2, characterized in that: A boss (152) is further provided on the surface of the fixing component (15) on the same side as the annular groove (151). The boss (152) protrudes from the surface along the axial direction. The boss (152) is arranged close to the axis of the fixing component (15). The annular groove (151) is located on the periphery of the boss (152). The boss (152) of one fixing component (15) is fitted with a side surface of an adjacent fixing component (15) that is away from the boss (152), so that a gap is left between the two adjacent fixing components (15) when they are fitted with each other.

4. The spiral disc type electric heating device according to claim 1, characterized in that: The electric heating plate (131) of each electric heating plate group (13) is formed by bending a strip of material, and each annular accommodating space (132) is provided with a notch (133) to form a non-closed ring shape, and the notches (133) on each annular accommodating space (132) are staggeredly arranged from the inside to the outside in the radial direction.

5. The spiral disc type electric heating device according to claim 3, characterized in that: It also includes a plurality of interlayer connecting sheets (14), each of the interlayer connecting sheets (14) being connected between two adjacent groups of the electric heating sheet groups (13), so that the two groups of the electric heating sheet groups (13) are connected in series or in parallel.

6. The spiral disc type electric heating device according to claim 5, characterized in that: The interlayer connecting sheet (14) and the electric heating sheet group (13) are welded to each other.

7. The spiral disc type electric heating device according to claim 6, characterized in that: The invention also comprises an end cover (16), wherein the end cover (16) is located at one side of the fixing component (15), and the end cover (16) is made of an insulating material. The first electrode (11) and the second electrode (12) are both columnar. An axial through hole (153) is provided at the axis center of the fixing component (15). A first mounting hole (161) and a second mounting hole (162) are provided on the end cover (16). The first mounting hole (161) is located at the axis center, and the second mounting hole (162) is offset from the axis center. The first electrode (11) passes through the axial through hole (153) and the first mounting hole (161) on each of the fixing components (15) in sequence. Locking bolts are provided at both ends of the first electrode (11), and the second electrode (12) is provided in the second mounting hole (162). A locking bolt is provided at one end of the second electrode (12) located outside the second mounting hole (162).

8. The spiral disc type electric heating device according to claim 7, characterized in that: The invention also comprises a first electrode connecting sheet (17) and a second electrode connecting sheet (18), wherein the first electrode connecting sheet (17) is clamped between the electric heating sheet group (13) located at the head and the first electrode (11), and the second electrode connecting sheet (18) is clamped between the electric heating sheet group (13) located at the tail and the second electrode (12), so that the first electrode (11) is electrically connected to the electric heating sheet group (13) located at the head, and the second electrode (12) is electrically connected to the electric heating sheet group (13) located at the tail.

9. The spiral disc type electric heating device according to claim 8, characterized in that: The second mounting hole (162) is a countersunk hole.

10. The spiral disc type electric heating device according to claim 9, characterized in that: The end cover (16) is provided with a via hole (163), and the interlayer connecting sheet (14) passes through the via hole (163) to be connected to the electric heating sheet (131).

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