Electric heater

Abstract

The present application relates to the technical field of energy conversion, in particular to an electric heater. The electric heater provided by the present application comprises an electric element and a plurality of heating rods. One end of the heating rod is used as a heated section, and the other end is used as a heat dissipation section. The end of the heat dissipation section away from the heated section is adjacent to the electric element. The plurality of heating rods in the heated section extend coaxially and uniformly in the circumferential direction. The plurality of heating rods in the heat dissipation section are distributed in a manner that the width of the outer contour in the height direction is less than the length in the horizontal direction. The present application designs the heating rods in the heat dissipation section in a flat type, reduces the superimposed heating effect of natural convection heat transfer on the upper heating rods and local high temperature accumulation. Not only can the natural heat dissipation efficiency of the heat dissipation section be improved, but also the damage to the electric element caused by local high temperature of the heating rod can be avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy conversion, in particular to an electric heater. BACKGROUND

[0002] New energy power generation such as wind power and photovoltaic power has obvious intermittency and volatility, and its power generation is greatly affected by weather, season and other factors. With the continuous increase of new energy installed capacity, the anti-interference ability of the power grid is reduced and the stability margin is insufficient, which brings new challenges to the stable operation of the power grid. Therefore, improving the new energy consumption capacity has become an inevitable trend of the development of the power grid.

[0003] Electric heating is an important way to consume new energy. In order to realize accurate temperature control, the end of the electric heater will be connected with the temperature control electrical element. In order to ensure the stable operation of the temperature control electrical element, the end of the electric heater needs to be cooled to a safe range. In the prior art, the heating rods in the electric heater are arranged in a ring-shaped multi-layer pipe bundle. Among them, the upper heating rod is affected by natural convection, and there is a problem of slow heat dissipation rate and local high temperature, which may cause damage to the electrical element. SUMMARY

[0004] In view of the above problems, the present application provides an electric heater which can make the heating rods achieve more uniform and rapid heat dissipation effect and avoid damage to the electrical element caused by local high temperature of the heating rods.

[0005] The present application provides an electric heater, which comprises:

[0006] an electrical element;

[0007] a plurality of heating rods, one end of the heating rod being used for heating and being a heating section, the other end being used for heat dissipation and being a heat dissipation section, the end of the heat dissipation section away from the heating section being adjacent to the electrical element, the plurality of heating rods located in the heating section extending coaxially and uniformly distributed in the circumferential direction, and the plurality of heating rods located in the heat dissipation section being distributed in a manner that the width in the height direction is less than the length in the horizontal direction.

[0008] Optionally, the electric heater further comprises:

[0009] a heat pipe, which is arranged around the heating rods on the side of the heat dissipation section close to the electrical element, absorbs the heat of the heating rods and transfers the heat to the air.

[0010] Optionally, the electric heater is parallel to the horizontal direction along the length direction of the heating rod.

[0011] Optionally, the electric heater further comprises:

[0012] a flange plate, which is arranged at the joint position of the heating section and the heat dissipation section, and the heating rods pass through the plane of the flange plate, and the electric heater is connected with the heating container by the flange plate.

[0013] Optionally, the heat pipe comprises a shell, and the heating rods in the heat dissipation section close to the electrical component are sealed in the shell.

[0014] Optionally, the internal space of the shell comprises:

[0015] an evaporation section, in which the heating rods sealed in the shell are located;

[0016] a condensation section, located above the evaporation section.

[0017] Optionally, the shell is filled with a heat exchange medium, which flows back and forth between the evaporation section and the condensation section.

[0018] Optionally, the temperature of the electrical component in the electric heater equipped with the heat pipe is not higher than 55℃.

[0019] Optionally, the heat exchange medium is acetone.

[0020] Optionally, the working temperature of the electric heater is 400+10℃.

[0021] The electric heater provided by the present application can effectively reduce the heat influence of natural convection heat exchange on the upper heating rods and local high-temperature accumulation by distributing the multiple heating rods in the heat dissipation section in a way that the width in the profile height direction is less than the length in the horizontal direction, i.e., the heating rods in the heat dissipation section are distributed in a flat manner, thereby effectively reducing the vertical heating rod density and further reducing the heat conduction of the heating rods in the heat dissipation section to the electrical component, so as to control the working environment temperature of the electrical component in a safer range and reduce the negative impact of high temperature on the service life of the electrical component. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic diagram of an electric heater provided by the first embodiment of the present application.

[0023] Figure 2 is a structural schematic diagram of an electric heater provided by the second embodiment of the present application.

[0024] The drawing label: 100-electric heater, 1-electrical component, 2-flange, 3-heating rod, 31-heated section, 32-heat dissipation section, 4-heat pipe, 41-shell, 41A-evaporation section, 41B-condensation section. DETAILED DESCRIPTION

[0025] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0026] <First embodiment>

[0027] The present embodiment provides an electric heater 100 applicable to new energy consumption, Figure 1 is a structural schematic diagram of an electric heater 100 provided by the present embodiment, referring to Figure 1 , the electric heater 100 comprises an electrical element 1 and a plurality of heating rods 3. One end of the heating rod 3 is used for heat receiving and is configured as a heat receiving section 31, and the other end is used for heat dissipation and is configured as a heat dissipation section 32. The end of the heat dissipation section 32 away from the heat receiving section 31 is adjacent to the electrical element 1. The plurality of heating rods 3 located in the heat receiving section 31 extend coaxially and parallelly and are uniformly distributed in the circumferential direction. The plurality of heating rods 3 located in the heat dissipation section 32 are distributed in a manner that the width in the height direction is less than the length in the horizontal direction.

[0028] In the present embodiment, the operation process of the electric heater 100 mainly comprises heat collection of the heat receiving section 31, heat conduction of the heating rod 3 and heat dissipation of the heat dissipation section 32. The operation process will be described below.

[0029] <Heat collection of heat receiving section>

[0030] In the present embodiment, the electric heater 100 receives and transmits the new energy to be consumed through a heat receiving container (not shown in the figure). Specifically, the heat receiving container is also filled with a heat receiving medium (not shown in the figure). The heating rod 3 at the heat receiving section 31 of the electric heater 100 is completely placed in the heat receiving container, so that the heating rod 3 is in full contact with the heat receiving medium. The new energy to be consumed is converted into heat energy and input into the heat receiving container, and then the heat energy in the heat receiving container is uniformly distributed through the heat receiving medium. Referring to Figure 1 , the electric heater 100 is also provided with a flange plate 2, which is arranged at one end of the heat receiving section 31, and the heating rod 3 passes through the plane of the flange plate 2 and is relatively fixed with the flange plate 2. The outer periphery of the flange plate 2 is also uniformly provided with openings (not shown in the figure). The flange plate 2 can be fixedly connected with the heat receiving container through the openings of the flange plate 2 by a fixing member, so as to ensure that the heat collection process of the heating rod 3 of the heat receiving section 31 in the heat receiving container is more stable. In other embodiments, the source of heat energy in the heat receiving container can also be converted or transmitted by other forms of energy, which is not limited here.

[0031] Referring to Figure 1Since the plurality of heating rods 3 of the heated section 31 in the embodiment extend coaxially in parallel and are uniformly distributed in the circumferential direction. The layout design can make the heating rods 3 uniformly dispersed in the heated container and fully contact with the heated medium, and then make the heating rods 3 of the heated section 31 absorb heat from different areas in the heated container as much as possible. On the one hand, it can make the heating degree of the heating rods 3 more uniform, avoid equipment damage and heat transfer effect decline caused by local overheating; on the other hand, it can improve the overall heating efficiency of the heated container for the heating rods 3 of the heated section 31, thereby further improving the consumption rate of new energy.

[0032] <Heat conduction of heating rod>

[0033] In the embodiment, the material of the heating rod 3 can be selected as a metal heat-conducting material. On the one hand, the heating rod 3 used needs to have good high-temperature resistance and high heat capacity. In the embodiment, the working temperature of the electric heater 100 is 400 + 10℃, which means that the heating temperature of the heating rod 3 during normal operation can reach about 400℃. At the same time, at this temperature, each working element in the electric heater 100 can be in a reasonable thermal load state, and a large amount of new energy can be quickly and stably consumed through the high-power heat source provided by the heated container.

[0034] On the other hand, the heating rod 3 used in the embodiment also has good thermal conductivity, so that the heat absorbed by it is quickly conducted along the length direction of the heating rod 3 to the heat dissipation section 32, and the heat is dissipated to the environment needing heating by the heating rod 3 of the heat dissipation section 32. By continuously transferring the heat in the heating rod 3 of the heated section 31 to the heat dissipation section 32 at a faster speed, the continuous consumption of excess new energy can be realized. In addition, the heating rod 3 also needs to have certain corrosion resistance, so that the heating rod 3 can normally maintain its heating and heat transfer capacity when contacting different types of heated medium under long-term high-temperature operating conditions.

[0035] <Heat dissipation of heat dissipation section>

[0036] In the embodiment, the part of the heating rod 3 of the heated section 31 extending through the flange plate 2 constitutes the heat dissipation section 32, that is, the flange plate 2 is arranged at the joint position of the heated section 31 and the heat dissipation section 32. After being heated by the heated container, the heat collected by the heating rod 3 in the heated section 31 will pass through the flange plate 2 along the length direction of the heating rod 3 and be transferred to the heating rod 3 of the heat dissipation section 32. Since the heating rod 3 of the heat dissipation section 32 is directly exposed to the air, the heat transferred to the heat dissipation section 32 will be directly dissipated from the surface of the heating rod 3 to the air, so that the temperature of the environment where the heat dissipation section 32 is located is increased. It can be specifically used in building heating and other scenes, which is not limited here.

[0037] When the heat dissipation section 32 of the electric heater 100 starts to dissipate heat, the air near the heating rod 3 is heated, the hot air rises, and the cold air around the heating rod 3 is supplemented to the position of the heating rod 3. In order to accelerate the air flow in the above heat dissipation process, thereby improving the heat dissipation effect, the electric heater 100 provided by the embodiment is parallel to the horizontal direction along the length direction of the heating rod 3, the air heated by the heating rod 3 will be perpendicular to the length direction of the heating rod 3, and will be quickly transferred upward, and the obstacles in the supplement path of the cold air around the heating rod 3 will be reduced as much as possible.

[0038] In order to realize the precise control of the heating temperature of the heating section 31 and the heat dissipation temperature of the heat dissipation section 32, the electric heater 100 provided by the embodiment further comprises an electrical element 1. Referring to Figure 1 , the electrical element 1 is adjacent to one end of the heat dissipation section 32 away from the heating section 31, so as to more accurately monitor the heat dissipation temperature of the heating rod 3 of the heat dissipation section 32, and feed back to the heating container, thereby adjusting the heating power of the heating container to the heating rod 3 of the heat dissipation section 32.

[0039] Although the heating rod 3 of the heat dissipation section 32 dissipates most of the heat in its interior to the air by heat exchange with the air. However, due to the influence of natural convection generated by the plurality of heating rods 3 in the heat dissipation process, the overall heat dissipation rate of the heating rod 3 is reduced, and the problem of local high temperature may occur, thereby causing a small part of heat to be conducted to the electrical element 1 due to the failure to dissipate from the heating rod 3 in time. If the working environment temperature of the electrical element 1 is too high, it will long-term bear high heat load, which may cause the electrical element 1 to be difficult to accurately control the temperature of the electric heater 100, and even cause the overall service life of the electric heater 100 to be negatively affected after the electrical element 1 fails.

[0040] In order to avoid the above problems, in the embodiment, the plurality of heating rods 3 of the heat dissipation section 32 are distributed in a manner that the width in the height direction is less than the length in the horizontal direction. Referring to Figure 1 , the heating rods 3 of the heat dissipation section 32 passing through the flange 2 from the heating section 31 gradually converge to the middle in the horizontal direction, and the heating rods 3 near the electrical element 1 in the heat dissipation section 32 are in a flat distribution, which specifically means that the density of the heating rods 3 in the height direction is effectively reduced, and the heating rods 3 in the horizontal direction are as flat as possible to increase the horizontal heat dissipation area. Through the flat distribution of the heating rods 3 of the heat dissipation section 32, the superimposed heat effect of natural convection on the upper heating rod 3 can be effectively reduced, and local high temperature accumulation can be avoided. At the same time, by increasing the contact area of the heating rods 3 of the heat dissipation section 32 with the air in the horizontal direction as much as possible and optimizing the flow path of the hot air formed by heating, the natural heat dissipation efficiency can be further improved, and a more suitable working environment temperature can be provided for the electrical element 1 adjacent to the heating rod 3.

[0041] <Second Embodiment>

[0042] Consider when the electric heater 100 provided by the first embodiment, in the face of a large number of new energy needs to be absorbed, if its heated section 31 of the heating rod 3 long-term received by the heat container of high-power heat transfer, and only through the heating rod 3 of the heat dissipation section 32 in the air in the form of natural heat dissipation, the heating rod 3 may not be timely heat dissipation, resulting in the electrical components 1 in contact with the heating rod 3 due to the high temperature of the heated temperature and increase the risk of damage.

[0043] In order to further strengthen the heating rod 3, especially the part of the heating rod 3 in contact with the electrical components 1 heat dissipation effect. In this embodiment, the electric heater 100 also includes a heat pipe 4. Figure 2 is a schematic diagram of an electric heater 100 provided by the present embodiment with a heat pipe 4, reference Figure 2 , the heat pipe 4 ring set in the heating rod 3 of the heat dissipation section 32 near the electrical components 1 side, by the heat pipe 4 quickly absorb part of the heating rod 3 heat, and transfer to the air, so that the electrical components 1 to bear the thermal load is reduced to ensure the service life of the electrical components 1.

[0044] Reference Figure 2 , the heat pipe 4 includes a shell 41, the heating rod 3 in the heat dissipation section 32 near the electrical components 1 side is sealed in the shell 41, so that part of the heating rod 3 is wrapped in the closed space inside the shell 41, so that the heat of the enclosed heating rod 3 is transferred to the outside air through the shell 41 of the heat pipe 4. Specifically, the internal space enclosed by the shell 41 includes an evaporation section 41A and a condensation section 41B. Reference Figure 2 , the heating rod 3 sealed in the shell 41 is located in the evaporation section 41A; the condensation section 41B is located above the evaporation section 41A. At the same time, the internal space enclosed by the shell 41 is also filled with a heat exchange medium (not shown in the figure).

[0045] In this embodiment, the heat exchange medium used is a volatile liquid, the initial heat exchange medium is in the evaporation section 41A and in contact with the surface of the heating rod 3 in the shell 41. When the heating rod 3 in the shell 41 receives heat transferred by the heated section 31, the heating rod 3 exchanges heat with the heat exchange medium. The heat exchange medium is evaporated from liquid to gas after being heated. Under the driving of the pressure difference between the evaporation section 41A and the condensation section 41B, the gaseous heat exchange medium is transported to the condensation section 41B and releases latent heat of vaporization, and the released heat is transferred to the outside air by the shell 41 of the condensation section 41B. The condensed liquid heat exchange medium returns to the evaporation section 41A by gravity or capillary action and exchanges heat with the heating rod 3 in the evaporation section 41A again. Through the above operation process of the heat pipe 4, heat exchange between the heating rod 3, the heat pipe 4 and the outside air is achieved, and the heat exchange medium is recycled.

[0046] In the embodiment, the heat exchange medium in the shell 41 is acetone. Since the boiling point of acetone is relatively low, specifically about 57℃. And the latent heat of the vaporized liquid acetone is relatively large, and it has good stability in both gas and liquid states. When acetone is used as the heat exchange medium, the contact temperature of the heating rod 3 sealed by the shell 41 and the electrical component 1 can be not higher than 55℃, thereby ensuring that the electrical component 1 has a relatively long service life. In other embodiments, other types of heat exchange media can also be selected according to the specific heat dissipation requirements of the heat dissipation section 32 of the electric heater 100 and the specific indicators of the electrical component 1 related to the heat load, which are not specifically limited here.

[0047] The preferred embodiments of the present application have been described above with reference to the drawings, but the present application is not limited to the above examples. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An electric heater, characterized by, The electric heater comprises: an electric appliance element; a plurality of heating rods, one end of each of the heating rods being configured as a heating section and the other end being configured as a heat dissipation section, the heat dissipation section being adjacent to the electric appliance element at a side away from the heating section, the heating rods at the heating section being coaxially and uniformly distributed in a circumferential direction, and the heating rods at the heat dissipation section being distributed in a manner that a width in a height direction is less than a length in a horizontal direction. a heat pipe being arranged around the heating rods at a side of the heat dissipation section close to the electric appliance element, the heat pipe absorbing heat from the heating rods and transferring the heat to air.

2. The electric heater according to claim 1, characterized in that The electric heater is parallel to the horizontal direction along a length direction of the heating rods.

3. The electric heater according to claim 1, wherein, The electric heater further comprises: a flange plate being arranged at a joint between the heating section and the heat dissipation section, and the heating rods passing through a plane of the flange plate, the electric heater being connected to a heating container by the flange plate.

4. The electric heater according to claim 1, wherein The heat pipe comprises a shell, and the heating rods at a side of the heat dissipation section close to the electric appliance element are sealed in the shell.

5. The electric heater according to claim 4, characterized in that An inner space of the shell comprises: an evaporation section, the heating rods at the heat dissipation section being located in the evaporation section; a condensation section being located above the evaporation section.

6. The electric heater according to claim 5, wherein The shell is filled with a heat exchange medium, and the heat exchange medium flows back and forth between the evaporation section and the condensation section.

7. The electric heater according to claim 6, characterized in that A temperature of the electric appliance element in the electric heater with the heat pipe is not higher than 55℃.

8. The electric heater according to claim 6, wherein The heat exchange medium is acetone.

9. The electric heater of claim 1, wherein, An operating temperature of the electric heater is 400±10℃.

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