An electric heating device

Abstract

The application discloses an electric heating device, which comprises a shell, upper and lower covers arranged at two ends of the shell, a main water channel and a plurality of auxiliary water channels arranged in the inner cavity of the shell, the main water channel being located at the center line position of the shell, and the auxiliary water channels being uniformly arranged about the circumference of the main water channel; the upper and lower covers are provided with inner cavities, the inner cavities of the upper and lower covers are communicated with the main water channel and the auxiliary water channels, a bag is arranged between the main water channel and the auxiliary water channels, a heating wire is arranged in the bag, and when the electric heating device operates, the heat-conducting working medium can circulate in the main water channel and the auxiliary water channels; when the heating wire is heated, the working medium in the auxiliary water channels absorbs heat and increases the surface temperature of the shell through heat transfer, the main water channel absorbs the heat radiated inward by the heating wire and can move to the auxiliary water channels through the pressure pump to transfer heat outward, so that the loss of heat of the heating wire is reduced; and the bag on the surface of the heating wire is stretchable and will not be cracked due to thermal expansion and cold contraction, so as to affect the heating process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heating devices, in particular to an electric heating device. BACKGROUND

[0002] The electric heating device is a device that converts electrical energy into heat energy to heat the material to be heated, which is widely used in various industrial production devices.

[0003] The heating device is generally composed of two structures, one is to convert electrical energy into heat energy through resistance wire, and the other is to utilize heat energy after heat transfer through heat-conducting medium, for example, the electric heating device disclosed in CN108266885B includes a cover and a shell, the cover and the shell are assembled, the shell includes at least one heating cavity and at least one preheating cavity, and the electric heating device includes at least one heating assembly.

[0004] This electric heating device sets preheating cavities and heating cavities, and the working medium in the preheating cavities can move to the heating cavities after absorbing heat, so that the heat radiated inward by the electric heating wire can also be utilized, but when a larger heating area is needed, the length of the electric heating wire increases, so that the length of the heating cavity and the preheating cavity also increases. The flow of the working medium between the heating cavity and the preheating cavity is only impacted by the gravity of the working medium, so that the working medium in the heating cavity enters from above the preheating cavity, and when the length of the electric heating wire is too long, the working medium between the heating cavity and the preheating cavity is difficult to communicate with each other; and when the electric heating wire heats air, frequent temperature changes cause the inner wall to frequently expand and contract, thereby causing cracks, so that the working medium can enter the working cavity through the gap to directly contact the electric heating wire, thereby affecting the heating process of the electric heating device. SUMMARY

[0005] The purpose of the present application is to solve the problems of the above background technology, that is, when the height of the device increases, the working medium of the heating cavity and the preheating cavity is difficult to circulate, and the electric heating wire heats the air, which causes the inner wall to crack due to frequent thermal expansion and contraction, and an electric heating device is proposed.

[0006] The purpose of the present application can be achieved by the following technical solutions:

[0007] An electric heating device, comprising a shell, the two ends of the shell are provided with an upper cover and a lower cover, characterized in that: the shell is provided with an inner cavity, the inner cavity comprises:

[0008] A main water channel is located at the center line position of the shell, and the main water channel penetrates the shell;

[0009] A plurality of auxiliary water channels are uniformly arranged around the circumference of the main water channel and penetrate the shell;

[0010] A bag is arranged between the main water channel and each sub water channel, and an electric heating wire is arranged in the bag;

[0011] A cavity is arranged in the upper cover and the lower cover, and an upper pipe and a lower pipe are arranged in the upper cover and the lower cover respectively, and the upper pipe and the lower pipe are provided with a closable switch, and the cavities of the upper cover and the lower cover are communicated with the main water channel and the sub water channel.

[0012] As a further scheme of the present application, one end of the electric heating wire close to the upper cover is fixedly connected to the top of the shell, and the other end of each electric heating wire is connected with a metal wire, and the two ends of the metal wire are connected to the inner wall of the bag, and the metal wire is electrically connected to the power supply.

[0013] As a further scheme of the present application, the diameter of the metal wire is 0.2-0.4mm.

[0014] As a further scheme of the present application, a pressure pump is arranged on the inner wall of the main water channel.

[0015] As a further scheme of the present application, the pressure pump is arranged at one end close to the upper cover.

[0016] As a further scheme of the present application, a water filtering film is arranged on the top of the upper cover, and the water filtering film is communicated with the hole cavity of the upper cover, and the material of the water filtering film is polytetrafluoroethylene.

[0017] As a further scheme of the present application, the two ends of the shell are fixedly connected with cover plates, and the upper cover and the lower cover are detachably arranged on the two cover plates respectively.

[0018] As a further scheme of the present application, the two cover plates are provided with a main channel and a sub channel, the shape of the main channel corresponds to the main water channel, and the shape, number and position of the sub channel correspond to the sub water channel.

[0019] The present application has the following advantages:

[0020] (1) The electric heating device of the present application is provided with a bag, and the electric heating wire performs heating work in the bag. When the electric heating wire heats air, the air will expand and contract due to heat. The stretchability of the bag itself prevents the inner wall from cracking, thereby prolonging the service life of the electric heater.

[0021] (2) The electric heating device of the present application is provided with a metal wire. When the electric heating wire heats, the bag expands and extends outward. When the temperature reaches a certain degree, the deformed bag will drive the two ends of the metal wire to break the metal wire, thereby disconnecting the corresponding electric heating wire and the power supply part, so that the electric heating wire stops heating, and the temperature in the heater is controlled.

[0022] (3) The electric heating device of the present application, by setting the pressure pump, when the height is too high, the impact of the working medium in the main waterway is difficult to make the working medium of the auxiliary waterway into the main waterway to complete the liquid circulation, the pressure pump increases the pressure of the working medium in the main waterway, and the working medium of the auxiliary waterway is attracted from the inner cavity of the upper cover into the main waterway to complete the circulation;

[0023] (4) The electric heating device of the present application, when the upper pipe and the lower pipe are closed and the shell is filled with working medium, the pressure pump can still make the working medium flow in the shell, so that the heat radiated inward by the heating wire is utilized, and the heat conducting medium material can be saved. BRIEF DESCRIPTION OF DRAWINGS

[0024] The present application will be further described below in conjunction with the drawings.

[0025] Fig. 1 is a structural schematic diagram of the electric heating device of the present application;

[0026] Fig. 2 is a structural schematic diagram of the shell and the upper and lower cover plates of the present application;

[0027] Fig. 3 is a sectional view of the electric heating device of the present application.

[0028] In the figure: 1, shell; 11, main waterway; 12, auxiliary waterway; 13, heating wire; 14, bag; 15, metal wire; 16, pressure pump; 2, cover plate; 21, main channel; 22, auxiliary channel; 3, upper cover; 4, upper pipe; 5, lower cover; 6, lower pipe; 7, water filter membrane. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0030] The present application is an electric heating device, which comprises a shell 1, please refer to Figs. 1-3As shown, the inside of the shell 1 is provided with a cavity, and the inner cavity space of the shell 1 is divided into several spaces, wherein the main water channel 11 is located at the axial center of the shell 1, and the remaining space is the auxiliary water channel 12; a working cavity is arranged between the main water channel 11 and each auxiliary water channel 12, and an electric heating wire 13 is arranged in each working cavity; one end of the electric heating wire 13 is fixedly connected with the top of the shell 1; the upper cover 3 and the lower cover 5 are detachably connected with the two ends of the shell 1 respectively; the upper cover 3 and the lower cover 5 are provided with inner grooves; the upper cover 3 is provided with an upper pipeline 4 at the top thereof; the lower cover 5 is provided with a lower pipeline 6 at the bottom thereof; the upper pipeline 4 and the lower pipeline 6 can communicate with the inner grooves of the upper cover 3 and the lower cover 5 respectively; the upper pipeline 4 and the lower pipeline 6 are provided with switches capable of being opened and closed; the inner wall of the main water channel 11 is provided with a pressure pump 16, and the position of the pressure pump 16 is close to the direction of the upper cover 3 on the inner wall of the main water channel 11.

[0031] When using the electric heater, the lower pipeline 6 is closed, and the heating medium is injected into the upper pipeline 4; after the heating medium enters the upper cover 3, it is divided into the inner space of the shell 1 through the through hole of the upper cover 3; at this time, the several heating wires in the shell 1 begin to work, the temperature in the shell 1 is raised, the working medium can absorb the temperature and transfer the heat to the shell 1, thereby raising the temperature of the surface of the shell 1 to achieve the heating effect; the working medium between the main water channel 11 and the auxiliary water channel 12 can communicate with each other, the working medium in the main water channel 11 can be transferred to the auxiliary water channel 12, the working medium in the main water channel 11 can absorb the heat from the electric heating wire 13 to the inside, and then the flowing working medium can be transferred to the auxiliary water channel 12 after absorbing the heat, thereby transferring the heat to the shell 1 to raise the temperature of the shell 1, so that the heat radiated inward by the several electric heating wires 13 can also be utilized.

[0032] Among them, the two sides of the shell 1 are fixedly provided with cover plates 2, and the cover plates 2 at the two ends are detachably connected with the upper cover 3 and the lower cover 5; the cover plates 2 are provided with main channels 21 and auxiliary channels 22, and the shapes, numbers and sizes of the main channels 21 and the auxiliary channels 22 correspond to the main water channel 11 and the auxiliary water channel 12 respectively; by arranging the cover plates 2 between the shell 1 and the end covers, the cover plates 2 can fix the end covers while being convenient to disassemble, and the working medium upper pipeline 4 enters, and the end cover plates 2 can play a certain supporting and damping effect.

[0033] When the electric heater is heated by the heating wire, the inner wall of the working cavity of the electric heating wire 13 will be heated and expanded, and the inner wall of the working cavity will be cracked after a long time of use, thereby the working medium may enter the working cavity where the electric heating wire 13 is arranged, affecting the heating effect of the electric heating wire 13.

[0034] Further, the shell 1 is provided with a plurality of pockets 14, which divide the inner cavity of the shell 1 into the main water channel 11 and the auxiliary water channel 12. The inside of each pocket 14 is provided with an electric heating wire 13, one end of which is fixedly connected to the top of the shell 1.

[0035] When the electric heating wire 13 of the pocket 14 is heated, the air in the pocket 14 expands, so that the volume of the pocket 14 becomes larger, and the two sides of the pocket 14 extend outward. After the heating of the electric heating wire 13 is completed, the pocket 14 can be concave inward, and the pocket 14 can be expanded and contracted, so that the working cavity will not be cracked due to thermal expansion and contraction, thereby further improving the service life of the electric heater.

[0036] The end of each electric heating wire 13 away from the upper cover plate 2 is provided with a metal wire 15, the two ends of which are fixedly connected to the inner wall of the corresponding pocket 14. Each metal wire 15 is electrically connected to the power supply assembly of the heater. When the electric heating wire 13 is heated, the pocket 14 will expand together, and the two ends of the metal wire 15 will extend outward with the expansion of the inner wall of the pocket 14. When the temperature in the working cavity is raised to a certain value by the electric heating wire 13, the corresponding expansion position of the pocket 14 causes the metal wire 15 to break. At this time, the electric heating wire 13 of the heater loses connection with the broken metal wire 15, and the power supply assembly of the heater cannot supply power to the electric heating wire 13 through the broken metal wire 15. Through the thermal expansion and contraction of the inside of the pocket 14, when the temperature reaches a specified temperature, the metal wire 15 is broken by the traction of the expanding pocket 14, so that the electric heating wire 13 loses connection with the power supply part and stops heating, preventing the temperature of the electric heating wire 13 from being too high and causing accidents, and playing a temperature control role. At the same time, when the temperature in a single pocket 14 is too high, only a single electric heating wire 13 will break, without affecting the overall heating process.

[0037] The diameter of the metal wire 15 is 0.2-0.4mm, so that the metal wire 15 can support the pocket 14 to a certain extent, and also can break with the outward deformation of the pocket 14.

[0038] The heater can make the working medium in the main water channel 11 impacted by gravity when the lower pipe 6 is closed, so that the working medium in the auxiliary water channel 12 can flow, when the height of the shell 1 is too high, the working medium in the auxiliary water channel 12 is difficult to enter the main water channel 11 through the inner cavity of the upper cover 3, thereby forming water circulation; by arranging the pressurizing pump 16 on the inner wall of the main water channel 11, the position of the pressurizing pump 16 is arranged at one end of the main water channel 11 close to the upper cover 3; when the working medium enters the inner cavity of the shell 1 from the upper pipe 4, the working medium is accumulated at the bottom of the shell 1 under the influence of its own gravity, the working medium falling from the main water channel 11 cannot push the working medium accumulated at the bottom to flow, forming water circulation, the pressurizing pump 16 on the top inner wall of the main water channel 11 will start to work, so that the water pressure at the top of the main water channel 11 increases, the adjacent auxiliary water channel 12 is affected by the pressure difference, and the working medium in the auxiliary water channel 12 will pass through the inner cavity of the upper cover 3 from the top into the main water channel 11, thereby completing the circulation, when the working medium fills the inside of the shell 1, the pressurizing pump 16 can also make the liquid in the main water channel 11 and the auxiliary water channel 12 flow, so that the working medium in the main water channel 11 can absorb the heat in the electric heating wire 13 and then transmit to the surface of the shell 1.

[0039] The top surface of the upper cover 3 is provided with a water filtering film 7, the water filtering film 7 is in communication with the inner cavity of the upper cover 3, the material of the water filtering film 7 is polytetrafluoroethylene, which can exhaust and drain water, so that the gas passes through the filtering film and the liquid is blocked, so that the gas generated by the evaporation of the working medium is discharged from the water filtering film 7, avoiding the influence of the bubbles generated by the gasification of the working medium.

[0040] The working principle of the present application: the electric heating device of the present application, by setting the main waterway 11 and several auxiliary waterways 12 in the inner cavity of the shell 1, the main waterway 11 and the auxiliary waterway 12 can communicate, the working cavity between the main waterway 11 and the auxiliary waterway 12 is provided with an electric heating wire 13, the electric heating wire 13 can heat the working medium in the main waterway 11 and the auxiliary waterway 12, the working medium in the auxiliary waterway 12 can indirectly heat the surface of the shell 1, the working medium in the main waterway 11 absorbs the heat radiated inward by the electric heating wire 13, the working medium in the main waterway 11 is impacted by the new working medium in the upper pipeline 4, and then enters the auxiliary waterway 12 on both sides from the cavity of the lower cover 5, then the working medium in the main waterway 11 absorbing heat enters the auxiliary waterway 12, and the heat is transferred to the surface of the shell 1 through heat transfer, the original working medium in the auxiliary waterway 12 is affected by the working medium in the main waterway 11, and enters the main waterway 11 from the inner cavity of the upper cover 3, so that the liquid circulation in the shell 1 is completed, and the heat absorbed by the working medium in the main waterway 11 can also be transferred to the outside; by setting the bag 14, the electric heating wire 13 heats in the bag 14, and the electric heating wire 13 will expand and contract when heating air, the stretchability of the bag 14 itself makes the inner wall not crack, thereby prolonging the service life of the electric heater; by setting the metal wire 15, when the electric heating wire 13 heats, the bag 14 expands and extends outward, when the temperature reaches a certain degree, the deformed bag 14 drives the both ends of the metal wire 15 to make the metal wire 15 break, so that the corresponding electric heating wire 13 is disconnected with the power supply part, the electric heating wire 13 stops heating, the temperature in the heater is controlled, and the disconnection of the electric heating wire 13 caused by the local high temperature does not affect the heating work of the whole heater; by setting the pressure pump 16, when the height of the shell 1 is too high, the impact of the working medium in the main waterway 11 on the working medium in the auxiliary waterway 12 is difficult to make the working medium in the auxiliary waterway 12 enter the main waterway 11 to complete the liquid circulation, the pressure pump 16 increases the pressure of the working medium in the main waterway 11, and the working medium in the auxiliary waterway 12 is attracted from the inner cavity of the upper cover 3 to enter the main waterway 11 to complete the circulation, and when the upper pipeline 4 and the lower pipeline 6 are closed at the same time, when the inner cavity of the shell 1 is filled with the working medium, the pressure pump 16 can still pressurize the main waterway 11 to make the liquid in the shell 1 circulate, so that the heat radiated inward by the electric heating wire 13 is utilized, and the continuous flow of the heat conducting medium can be avoided, thereby reducing the waste of materials.

[0041] The above describes one embodiment of the present application in detail, but the content described is only the preferred embodiment of the present application, and cannot be considered as limiting the scope of the present application. Any equivalent changes and improvements made according to the scope of the present application should still belong to the patent coverage range of the present application.

Claims

1. An electric heating device comprising a housing (1) provided with an upper cover (3) and a lower cover (5) at both ends of the housing (1), characterized in that; The shell (1) is provided with an inner cavity, which comprises: A main water channel (11) is located at the center line position of the shell (1), and the main water channel (11) penetrates the shell (1); A plurality of auxiliary water channels (12) are uniformly arranged around the circumference of the main water channel (11) and penetrate the shell (1); A pouch (14) is arranged between the main water channel (11) and each auxiliary water channel (12), and an electric heating wire (13) is arranged inside each pouch (14); The inner cavity of the upper cover (3) and the lower cover (5) is provided with a cavity, and the upper cover (3) and the lower cover (5) are respectively provided with an upper pipe (4) and a lower pipe (6), and the upper pipe (4) and the lower pipe (6) are provided with a closable switch, and the cavities of the upper cover (3) and the lower cover (5) are communicated with the main water channel (11) and the auxiliary water channel (12); One end of the electric heating wire (13) close to the upper cover (3) is fixedly connected with the top of the shell (1), and the other end of each electric heating wire (13) is connected with a metal wire (15), and the two ends of the metal wire (15) are connected with the inner wall of the pouch (14), and the metal wire (15) is electrically connected with the power supply; The diameter of the metal wire (15) is 0.2-0.4mm.

2. An electric heating device according to claim 1, characterised in that The inner wall of the main water channel (11) is provided with a pressure pump (16).

3. An electric heating device according to claim 2, characterised in that The position of the pressure pump (16) is arranged at one end close to the upper cover (3).

4. An electric heating device according to claim 1, characterized in that The top of the upper cover (3) is provided with a water filter membrane (7), and the water filter membrane (7) is communicated with the hole cavity of the upper cover (3), and the material of the water filter membrane (7) is polytetrafluoroethylene.

5. An electric heating device according to claim 1, characterized in that The both ends of the shell (1) are fixedly connected with cover plates (2), and the both sides of the cover plates (2) are respectively detachably provided with upper covers (3) and lower covers (5).

6. An electric heating device according to claim 1, characterized in that The both sides of the cover plates (2) are provided with main channels (21) and auxiliary channels (22), and the shape of the main channels (21) corresponds to the position of the main water channel (11), and the shape, number and position of the auxiliary channels (22) correspond to the auxiliary water channels (12).

Images