Electric heating device and air conditioner

Abstract

The invention relates to the technical field of air conditioners, in particular to an electric heating device and an air conditioner, the electric heating device comprises a heating part, a shell and heat preservation cotton, a first cavity is formed in the shell, the heating part is arranged in the first cavity, the heat preservation cotton surrounds the outer side of the shell, and a second cavity is formed between the heat preservation cotton and the shell. Air serves as a heat insulation medium in the second cavity, the heat insulation and cooling effects can be achieved in the heat transfer process, heat of the heating component in the first cavity is greatly reduced when being transferred to the second cavity, and in other words, compared with the prior art that heat generated by an electric heating pipe is transferred to a shell, and the shell directly transfers heat to heat preservation cotton, the heat insulation effect is greatly improved. An air medium is additionally arranged between the shell and the heat preservation cotton, the temperature can be effectively reduced, smoke or fire caused by temperature rise of the heat preservation cotton is avoided, and the problem of safety accidents is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an electric heating device and an air conditioner. Background Art

[0002] With the development of air conditioning, heat pump air conditioning has more and more application scenarios, and the requirements for outlet water temperature are getting higher and higher. The general outlet water temperature is basically around 50°. In order to achieve a higher temperature, electric heating of the water circuit is usually added to the water circuit. However, the electric heating of the water circuit is an electric heating tube. The temperature of the electric heating tube is related to the watt density. The higher the watt density, the greater the heat output and the higher the heated water temperature. The lower the watt density, the lower the heated water temperature. Therefore, the watt density is basically high, so that the water temperature can be quickly heated to the highest. At the same time, in order to keep warm, a layer of insulation cotton is added to the outside of the electric heating. However, when the watt density is higher and the water flow rate is lower, the temperature of the cylinder in contact with the insulation cotton will be higher, which may melt and cause the insulation cotton to catch fire, creating hidden dangers.

[0003] When the existing electric heating tube is heated, the water flow is unstable and sometimes the water flow is small, resulting in insufficient water to take away the heat of the heating tube, causing the temperature of the tube to be high. The outer surface of the tube is wrapped with a layer of heat-insulating cotton. If the temperature reaches the ignition point of the heat-insulating cotton, the heat-insulating cotton will smoke or even catch fire. Summary of the invention

[0004] The present invention provides an electric heating device and an air conditioner to solve one of the defects in the prior art. An air medium is added between the outer shell and the thermal insulation cotton, which can effectively reduce the temperature and avoid smoke or fire caused by the increase in temperature of the thermal insulation cotton, thereby solving the problem of safety accidents.

[0005] An embodiment of the present invention provides an electric heating device, including a heating component, a shell and thermal insulation cotton, wherein a first cavity is provided inside the shell, the heating component is arranged in the first cavity, the thermal insulation cotton is arranged around the outside of the shell, and a second cavity is formed between the thermal insulation cotton and the shell.

[0006] According to an electric heating device provided by the present invention, the electric heating device further comprises a liquid inlet pipe and a liquid outlet pipe, wherein the liquid inlet pipe and the liquid outlet pipe are both connected to the first cavity, and the position of the liquid inlet pipe is lower than the position of the liquid outlet pipe. The bottom-in and top-out flow path can slow down the speed of the liquid flowing through the first cavity, while extending the liquid circulation time and enhancing the heating effect of the heating component.

[0007] An electric heating device provided according to the present invention, a pipe section of the liquid inlet pipe passing through the second cavity is provided with a first opening, a valve body is provided at the first opening, and the valve body is adapted to control the on-off of the first opening and the second cavity. A part of the liquid in the liquid inlet pipe is shunted and enters the second cavity through the first opening, gradually filling the second cavity, using the liquid as the filling medium of the second cavity, that is, forming a heat insulation layer of liquid medium between the heat insulation cotton and the outer cylinder.

[0008] An electric heating device provided according to the present invention, a first exhaust valve is provided at the top of the second cavity. The gas can be discharged by opening the first exhaust valve to maintain the normal pressure state of the second cavity, and at the same time take away heat, reduce the temperature, reduce the possibility of the heat insulation cotton catching fire and smoking, and reduce potential safety hazards.

[0009] An electric heating device provided according to the present invention, a second exhaust valve is provided at the top of the first cavity. When the liquid is heated and evaporated to generate gas, when the liquid medium is heated to a gaseous state, a certain pressure is generated to increase the pressure of the second cavity, and the gas rises and accumulates at the top of the first cavity. The gas is discharged by opening the second exhaust valve to maintain the normal pressure state of the first cavity and reduce potential safety hazards.

[0010] An electric heating device provided according to the present invention further includes a bracket, and the bracket is arranged between the outer shell and the heat insulation cotton to support the heat insulation cotton. The bracket can support the heat insulation cotton according to the shape of the outer shell, providing a supporting and fixing function for the heat insulation cotton.

[0011] An electric heating device provided according to the present invention, the bracket includes a sleeve and a top plate, the sleeve is sleeved outside the side wall of the outer shell, the top plate is arranged outside the top of the outer shell and is connected to the sleeve, and the heat insulation cotton covers the outer walls of the sleeve and the top plate. To ensure that the second cavity between the heat insulation cotton and the outer shell can be filled with liquid medium, under the condition of not changing the nature of the heat insulation cotton itself, the structure of the bracket and the outer shell can be used to realize the forming and sealing of the second cavity and the covering range of the heat insulation cotton.

[0012] An electric heating device provided according to the present invention, a second opening is provided at the bottom of the second cavity. A second opening is provided on the bracket located at the bottom of the second cavity, and the second opening is communicated with the second cavity, and the liquid medium in the second cavity can be discharged.

[0013] An electric heating device provided according to the present invention, the heating component is connected to a power cord, and the power cord passes through the bottom of the outer shell and enters the first cavity. The power cord directly passes through the bottom of the outer shell from the outside and enters the first cavity to be connected to the heating component to supply power to the heating component.

[0014] An electric heating device provided by the present invention further includes a temperature sensor and a contactor. The temperature sensor is disposed in the heat insulation cotton, and the contactor is disposed on the power line. The contactor is connected to the temperature sensor to control the on / off of the power line circuit according to the detection result of the temperature sensor. The temperature of the heat insulation cotton is controlled by the heating component. When the heating temperature is too high, even if the power supply of the heating component is cut off, the heating component stops heating to achieve the effect of cooling the heat insulation cotton.

[0015] In an electric heating device provided by the present invention, a fuse is provided on the line of the power line located in the first cavity. The fuse is directly connected to the electric heating tube. The temperature of the fuse reacts relatively quickly. By setting a heat insulation medium between the heat insulation cotton and the outer shell and controlling the temperature of the heat insulation cotton, the reaction is relatively slow and it is difficult to achieve the effect of timely temperature control. The fuse can protect in advance before the temperature of the heat insulation cotton reaches the melting point, thereby avoiding the potential hazards of smoking and fire caused by too high temperature of the heat insulation cotton.

[0016] The present invention also provides an air conditioner including the electric heating device as described above.

[0017] In the electric heating device provided by the present invention, a heating component is disposed in the first cavity inside the outer shell. The heating component can heat and raise the temperature of the liquid in the first cavity. The heat insulation cotton is wrapped outside the outer shell to play a role in heat preservation and heat insulation for the heating temperature of the heating component and the heating environment of the first cavity. The space enclosed between the heat insulation cotton and the shell forms a second cavity. After the heat generated by the heating component is transferred to the outer shell, it is then transferred from the outer shell to the second cavity, and finally transferred from the second cavity to the heat insulation cotton, which can reduce the heat transfer directly from the outer shell to the heat insulation cotton to a certain extent.

[0018] Air is used as the heat insulation medium in the second cavity, which can play an effect of heat insulation and temperature reduction during the heat transfer process. The heat of the heating component in the first cavity will be greatly reduced when transferred to the second cavity. That is, compared with the prior art where the heat generated by the electric heating tube is transferred to the outer shell and the outer shell directly transfers to the heat insulation cotton, there is an air medium between the outer shell and the heat insulation cotton, which can effectively reduce the temperature and avoid the heat insulation cotton from rising in temperature and causing smoke or fire, solving the problem of safety accidents. Moreover, the setting of the second cavity is equivalent to adding an air heat preservation layer between the outer shell and the heat insulation cotton, which can not only achieve the heat insulation effect relative to the heat insulation cotton, but also play a role in heat preservation for the temperature environment of the first cavity to a certain extent. Description of the Drawings

[0019] To more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the attached drawings required in the description of the embodiments or the prior art. Obviously, the attached drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other attached drawings can be obtained based on these attached drawings.

[0020] Figure 1 It is one of the structural schematic diagrams of the electric heating device provided by the embodiment of the present invention; Figure 2 It is the second structural schematic diagram of the electric heating device provided by the embodiment of the present invention; Figure 3 It is the third structural schematic diagram of the electric heating device provided by the embodiment of the present invention; Figure 4 It is the fourth structural schematic diagram of the electric heating device provided by the embodiment of the present invention.

[0021] Reference numerals: 100, heating component; 110, power cord; 120, temperature sensor; 130, contactor; 140, fuse; 150, cold end; 200, housing; 210, first cavity; 220, second exhaust valve; 300, heat insulation cotton; 310, second cavity; 320, first exhaust valve; 330, second opening; 400, liquid inlet pipe; 410, first opening; 500, liquid outlet pipe; 600, bracket; 610, sleeve; 620, top plate. Detailed implementation manners

[0022] To make the objectives, technical solutions and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention with reference to the attached drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0023] As Figure 1 shown, the electric heating device provided by the embodiment of the present invention includes a heating component 100, a housing 200 and a heat insulation cotton 300. A first cavity 210 is provided inside the housing 200. The heating component 100 is arranged in the first cavity 210. The heat insulation cotton 300 is disposed around the outside of the housing 200, and a second cavity 310 is formed between the heat insulation cotton 300 and the housing 200.

[0024] In the electric heating device according to an embodiment of the present invention, a heating component 100 is disposed in a first cavity 210 inside a housing 200. The heating component 100 can heat up the liquid in the first cavity 210. A heat-insulating cotton 300 is wrapped outside the housing 200, which has a heat-insulating effect on the heating temperature of the heating component 100 and the heating environment of the first cavity 210. The space formed between the heat-insulating cotton 300 and the housing forms a second cavity 310. After the heat generated by the heating component 100 is transferred to the housing 200, it is then transferred from the housing 200 to the second cavity 310, and finally from the second cavity 310 to the heat-insulating cotton 300, which can reduce the heat transfer directly from the housing 200 to the heat-insulating cotton 300 to a certain extent.

[0025] Air is used as a heat-insulating medium in the second cavity 310, which can play a role in heat insulation and temperature reduction during the heat transfer process. The heat of the heating component 100 in the first cavity 210 will be significantly reduced when it is transferred to the second cavity 310. That is, compared with the prior art where the heat generated by the electric heating tube is transferred to the housing 200 and the housing 200 directly transfers it to the heat-insulating cotton 300, there is an air medium between the housing 200 and the heat-insulating cotton 300, which can effectively reduce the temperature and prevent the heat-insulating cotton 300 from rising in temperature and causing smoke or fire, thus solving the problem of safety accidents. Moreover, the setting of the second cavity 310 is equivalent to adding an air heat-insulating layer between the housing 200 and the heat-insulating cotton 300, which can not only achieve the heat-insulating effect relative to the heat-insulating cotton 300, but also play a role in maintaining the temperature of the temperature environment of the first cavity 210 to a certain extent.

[0026] In other embodiments, a sealed cavity can also be formed between the heat-insulating cotton 300 and the housing 200, that is, the second cavity 310 can also be a vacuum cavity, which can also insulate heat, reduce heat transfer, and cool down the heat-insulating cotton 300.

[0027] According to an embodiment provided by the present invention, the electric heating device further includes a liquid inlet pipe 400 and a liquid outlet pipe 500. Both the liquid inlet pipe 400 and the liquid outlet pipe 500 are communicated with the first cavity 210, and the position of the liquid inlet pipe 400 is lower than the position of the liquid outlet pipe 500. In this embodiment, the liquid flows through the first cavity 210 from bottom to top in the vertical direction. Therefore, the position of the liquid inlet pipe 400 is lower than the position of the liquid outlet pipe 500. The liquid enters the inside of the first cavity 210 through the liquid inlet pipe 400, gradually accumulates to the position of the liquid outlet pipe 500, and flows out through the liquid outlet pipe 500. The heating component 100 heats the liquid during the process of the liquid flowing through the first cavity 210. The downward-inlet and upward-outlet flow path can delay the flow rate of the liquid flowing through the first cavity 210, and at the same time extend the liquid flow time, enhancing the heating effect of the heating component 100.

[0028] Such as Figure 2As shown, according to an embodiment provided by the present invention, the liquid inlet pipe 400 is provided with a first opening 410 in the pipe section passing through the second cavity 310. A valve body is provided at the first opening 410, and the valve body is adapted to control the on-off of the first opening 410 and the second cavity 310. In this embodiment, the liquid inlet pipe 400 passes through the thermal insulation cotton 300 and enters the second cavity 310, passes through the outer shell 200 after passing through the second cavity 310, and finally communicates with the first cavity 210. The liquid inlet pipe 400 is provided with a first opening 410 on the pipe section passing through the second cavity 310, and a valve body is provided at the first opening 410. When the valve body is opened, the first opening 410 communicates with the second cavity 310. When the valve body is closed, the first opening 410 is disconnected from the second cavity 310.

[0029] When there is normal liquid flow in the liquid inlet pipe 400, the valve body is opened to connect the first opening 410 with the second cavity 310. A part of the liquid in the liquid inlet pipe 400 is shunted through the first opening 410 and enters the second cavity 310, gradually filling the second cavity 310. Taking the liquid as the filling medium of the second cavity 310, that is, a heat insulation layer of liquid medium is formed between the thermal insulation cotton 300 and the outer cylinder. When there is no liquid flow in the liquid inlet pipe 400, the valve body is closed to disconnect the first opening 410 from the second cavity 310, and the liquid in the second cavity 310 remains in the second cavity 310. Using the liquid in the liquid inlet pipe 400 as the filling medium in the second cavity 310, there is no need to set up another device structure to provide medium for the second cavity 310, which is more convenient and faster to obtain, and makes the device structure more simple and compact.

[0030] When the heating component 100 heats up the liquid in the first cavity 210, the outer shell 200 transfers the heat to the liquid in the second cavity 310. The liquid in the second cavity 310 absorbs heat and evaporates, consuming a part of the heat transferred to the thermal insulation cotton 300, thereby reducing the temperature of the thermal insulation cotton 300 and keeping the thermal insulation cotton 300 within a reasonable temperature range so as not to catch fire or produce flames.

[0031] According to an embodiment provided by the present invention, a first exhaust valve 320 is provided at the top of the second cavity 310. In this embodiment, the first exhaust valve 320 passes through the thermal insulation cotton 300 from the outside to reach the top of the second cavity 310. When the temperature of the heating component 100 rises, the outer shell 200 also heats the liquid medium in the second cavity 310, and the temperature of the liquid medium also rises accordingly. The liquid medium evaporates, taking away part of the heat and generating gas. When the liquid medium is heated to the gaseous state, a certain pressure is generated to increase the pressure in the second cavity 310. The gas rises and accumulates at the top of the second cavity 310. The gas can be discharged by opening the first exhaust valve 320 to maintain the normal pressure state of the second cavity 310, while taking away heat, reducing the temperature, reducing the possibility of the thermal insulation cotton 300 smoking and catching fire, and reducing potential safety hazards.

[0032] According to an embodiment provided by the present invention, a second exhaust valve 220 is provided at the top of the first cavity 210. In this embodiment, the second exhaust valve 220 passes through the thermal insulation cotton 300, the second cavity 310, and the outer shell 200 from outside to inside to reach the top of the first cavity 210. When the temperature of the heating component 100 rises, the liquid in the first cavity 210 is heated, and the liquid is heated and evaporated to generate gas. When the liquid medium is heated to a gaseous state, a certain pressure is generated to increase the pressure in the second cavity 310, and the gas rises and accumulates at the top of the first cavity 210. The gas is discharged by opening the second exhaust valve 220 to maintain the normal pressure state of the first cavity 210 and reduce potential safety hazards.

[0033] According to an embodiment provided by the present invention, the electric heating device further includes a bracket 600. The bracket 600 is disposed between the outer shell 200 and the thermal insulation cotton 300 to support the thermal insulation cotton 300. In this embodiment, the bracket 600 is disposed between the thermal insulation cotton 300 and the outer shell 200. The bracket 600 can support the thermal insulation cotton 300 according to the shape of the outer shell 200, providing a supporting and fixing function for the thermal insulation cotton 300.

[0034] In this embodiment, the bracket 600 can be a multi-layer bracket 600 annularly distributed along the side wall of the outer shell 200, providing multi-point support and fixation for the thermal insulation cotton 300 in the circumferential direction around the outer shell 200. On the basis of ensuring the support of the thermal insulation cotton 300, the through effect of the second cavity 310 between the thermal insulation cotton 300 and the outer shell 200 can also be ensured.

[0035] According to an embodiment provided by the present invention, the bracket 600 includes a sleeve 610 and a top plate 620. The sleeve 610 is sleeved outside the side wall of the outer shell 200, and the top plate 620 is disposed outside the top of the outer shell 200 and is connected to the sleeve 610. The thermal insulation cotton 300 covers the outer walls of the sleeve 610 and the top plate 620.

[0036] In this embodiment, the bracket 600 is mainly composed of a sleeve 610 and a top plate 620. The outer shell 200 is divided into three parts: a top, a bottom, and a side wall. The sleeve 610 is sleeved outside the side wall of the outer shell 200, and the top plate 620 is located above the top of the outer shell 200, that is, the top plate 620 is connected to the top of the sleeve 610. The lower side of the top plate 620 and the inner side of the sleeve 610 are the second cavity 310. The outer side of the sleeve 610 and the upper side of the top plate 620 are covered with the thermal insulation cotton 300. Thus, the thermal insulation cotton 300 is attached to the outside of the sleeve 610 and the top plate 620. The bracket 600 composed of the sleeve 610 and the top plate 620 is adapted to the shape of the outer shell 200, supporting and fixing the shape and position of the thermal insulation cotton 300.

[0037] In this embodiment, between the thermal insulation cotton 300 and the outer shell 200, there are brackets 600 distributed in multiple layers circumferentially around the outer shell 200, as well as brackets 600 in the contour of the outer shell 200 composed of a sleeve 610 and a top plate 620. To ensure that the second cavity 310 between the thermal insulation cotton 300 and the outer shell 200 can be filled with a liquid medium, under the condition of not changing the nature of the thermal insulation cotton 300 itself, by using the structural cooperation between the bracket 600 and the outer shell 200, the formation and sealing of the second cavity 310 and the coverage range of the thermal insulation cotton 300 can be achieved.

[0038] According to an embodiment provided by the present invention, a second opening 330 is provided at the bottom of the second cavity 310. In this embodiment, the coverage range of the thermal insulation cotton 300 is the side wall and the top of the outer shell 200, and only the bracket 600 is connected to the bottom of the outer shell 200 as the bottom seal of the second cavity 310. Thus, the second opening 330 is provided on the bracket 600 at the bottom of the second cavity 310, and the second opening 330 communicates with the second cavity 310, and the liquid medium in the second cavity 310 can be discharged.

[0039] In this embodiment, a corresponding valve body can also be provided for the second opening 330. When it is necessary to discharge the liquid medium, the valve body is opened, and when the liquid discharge is no longer required, the valve body is closed. The liquid medium discharged from the second opening 330 can also be recycled to the liquid inlet pipe 400 and then flow into the second cavity 310 or the first cavity 210 again, realizing the circulation of the liquid, saving energy and being environmentally friendly, and at the same time providing convenience for the maintenance of the device.

[0040] According to an embodiment provided by the present invention, the heating component 100 is connected to a power cord 110, and the power cord 110 passes through the bottom of the outer shell 200 and enters the first cavity 210. In this embodiment, the coverage range of the thermal insulation cotton 300 is the side wall and the top of the outer shell 200, and only the bracket 600 is connected to the bottom of the outer shell 200 as the bottom seal of the second cavity 310. Thus, the power cord 110 directly passes through the bottom of the outer shell 200 from the outside and enters the first cavity 210 to be connected to the heating component 100 to supply power to the heating component 100. There is no complex structure in the connection path of the power cord 110, reducing the positions for sealing treatment and simplifying the structure.

[0041] In this embodiment, the heating component 100 adopts an electric heating tube. The electric heating tube is connected to two power cords 110, which are respectively the zero wire and the live wire. The power cords 110 supply power to the electric heating tube, and the electric heating tube is spirally arranged along the liquid flow direction in the first cavity 210 to achieve the effect of fully heating and raising the temperature of the liquid in the first cavity 210.

[0042] As Figure 3As shown, according to an embodiment provided by the present invention, the electric heating device further includes a temperature sensor 120 and a contactor 130. The temperature sensor 120 is disposed in the heat insulation cotton 300, and the contactor 130 is disposed on the power line 110. The contactor 130 is connected to the temperature sensor 120 to control the on / off of the circuit of the power line 110 according to the detection result of the temperature sensor 120.

[0043] In this embodiment, the electric heating device further includes a temperature control component, which is composed of the temperature sensor 120 and the contactor 130, and can control the on / off of the power supply of the heating component 100. The temperature sensor 120 is disposed outside the heat insulation cotton 300, can detect the temperature of the heat insulation cotton 300 in real time, and send a control signal to the contactor 130. The contactor 130 is disposed on the power line 110 and outside the housing 200. The on / off of the contactor 130 controls the on / off of the power line 110. Furthermore, the temperature of the heat insulation cotton 300 is controlled by the heating component 100. When the heating temperature is too high, the power supply of the heating component 100 is cut off in time, so that the heating component 100 stops heating to achieve the effect of cooling the heat insulation cotton 300.

[0044] When the temperature sensor 120 senses that the temperature of the heat insulation cotton 300 reaches the preset temperature, a disconnection signal is output to the A1 and A2 terminals of the AC contactor 130, so that the AC contactor 130 disconnects, and the power supply line 110 of the electric heating tube is disconnected. When the temperature sensor 120 senses that the temperature of the heat insulation cotton 300 is lower than the preset temperature, a closing signal is output to the A1 and A2 terminals of the AC contactor 130, so that the AC contactor 130 closes, and the power supply line 110 of the electric heating tube is restored to be connected.

[0045] As Figure 4 shown, according to an embodiment provided by the present invention, a fuse 140 is provided on the line of the power line 110 located in the first cavity 210. In this embodiment, the temperature control component adopts the fuse 140 added between the electric heating tube and the cold end 150. The function of the cold end 150 is to prevent the temperature of the electric heating tube from being transmitted to the power line 110 and has a conductive function. When the electric heating device is in a dry burning state, the temperature of the electric heating tube rises sharply, resulting in the temperature of the fuse 140 also rising. When the temperature of the fuse 140 reaches a certain temperature, the fuse 140 disconnects, cutting off the power supply of the electric heating tube and reducing the temperature of the electric heating tube. The temperature of the heat insulation cotton 300 is controlled by the heating component 100. When the heating temperature is too high, the power supply of the heating component 100 is cut off in time, so that the heating component 100 stops heating to achieve the effect of cooling the heat insulation cotton 300.

[0046] In this embodiment, the fuse 140 is directly connected to the electric heating tube. The temperature of the fuse 140 responds relatively quickly. By setting a heat insulation medium between the heat preservation cotton 300 and the outer shell 200 to control the temperature of the heat preservation cotton 300, the reaction is relatively slow and it is difficult to achieve the effect of timely temperature control. The fuse 140 can provide protection in advance before the temperature of the heat preservation cotton 300 reaches the melting point, thus avoiding the potential hazards of smoking and fire caused by too high a temperature of the heat preservation cotton 300.

[0047] In this embodiment, the temperature of the fuse 140 is selected to be lower than the ignition point temperature of the heat preservation cotton 300 to achieve advance protection and avoid the problem that the residual heat of the electric heating tube causes the temperature of the heat preservation cotton 300 to continue to rise. The ignition point temperature of the heat preservation cotton 300 can be selected according to the material of the heat preservation cotton 300.

[0048] The air conditioner provided by the present invention will be described below. The air conditioner described below can be correspondingly referred to the electric heating device described above.

[0049] An embodiment of the present invention further provides an air conditioner, including the electric heating device as described in the above embodiment.

[0050] In the air conditioner of the embodiment of the present invention, the electric heating device described in the above embodiment is arranged on the water path. The air is used as the heat insulation medium in the second cavity 310 of the electric heating device, which can play the role of heat insulation and temperature reduction in the process of heat transfer. The heat of the heating component 100 in the first cavity 210 will be greatly reduced when it is transferred to the second cavity 310. That is, compared with the prior art in which the heat generated by the electric heating tube is transferred to the outer shell 200 and the outer shell 200 is directly transferred to the heat preservation cotton 300, there is an additional air medium between the outer shell 200 and the heat preservation cotton 300, which can effectively reduce the temperature and avoid the heat preservation cotton 300 from rising in temperature and causing smoke or fire, thus solving the problem of safety accidents. Moreover, the setting of the second cavity 310 is equivalent to adding an air heat preservation layer between the outer shell 200 and the heat preservation cotton 300, which can not only achieve the heat insulation effect relative to the heat preservation cotton 300, but also play a role in heat preservation for the temperature environment of the first cavity 210 to a certain extent.

[0051] Therefore, the electric heating tube in the air conditioner can achieve the highest efficiency of water temperature heating while ensuring a high watt density, and can avoid the heat preservation cotton 300 from catching fire due to too high a temperature, ensuring that the heat preservation cotton 300 can play a better heat preservation effect.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electric heating device, characterized in that, It includes a heating component (100), a housing (200) and heat insulation cotton (300). A first cavity (210) is provided inside the housing (200). The heating component (100) is disposed in the first cavity (210). The heat insulation cotton (300) is disposed around the outside of the housing (200), and a second cavity (310) is formed between the heat insulation cotton (300) and the housing (200).

2. The electric heating device according to claim 1, characterized in that, It further includes a liquid inlet pipe (400) and a liquid outlet pipe (500). Both the liquid inlet pipe (400) and the liquid outlet pipe (500) are communicated with the first cavity (210). The position of the liquid inlet pipe (400) is lower than that of the liquid outlet pipe (500).

3. The electric heating device according to claim 2, characterized in that, A first opening (410) is provided on the pipe section of the liquid inlet pipe (400) passing through the second cavity (310). A valve body is provided at the first opening (410). The valve body is adapted to control the on-off of the first opening (410) and the second cavity (310).

4. The electric heating device according to claim 1, characterized in that, A first exhaust valve (320) is provided at the top of the second cavity (310).

5. The electric heating device according to claim 1, characterized in that, A second exhaust valve (220) is provided at the top of the first cavity (210).

6. The electric heating device according to claim 1, characterized in that It further includes a bracket (600). The bracket (600) is disposed between the housing (200) and the heat insulation cotton (300) to support the heat insulation cotton (300).

7. The electric heating device according to claim 6, characterized in that, The bracket (600) includes a sleeve (610) and a top plate (620). The sleeve (610) is sleeved outside the side wall of the housing (200). The top plate (620) is disposed outside the top of the housing (200) and is connected to the sleeve (610). The heat insulation cotton (300) covers the outer walls of the sleeve (610) and the top plate (620).

8. The electric heating device according to claim 7, characterized in that A second opening (330) is provided at the bottom of the second cavity (310).

9. The electric heating device according to claim 7, characterized in that, The heating component (100) is connected to a power line (110). The power line (110) passes through the bottom of the housing (200) and enters the first cavity (210).

10. The electric heating device according to claim 9, characterized in that, It further includes a temperature sensor (120) and a contactor (130). The temperature sensor (120) is disposed on the heat insulation cotton (300). The contactor (130) is disposed on the power line (110). The contactor (130) is connected to the temperature sensor (120) to control the on-off of the circuit of the power line (110) according to the detection result of the temperature sensor (120).

11. The electric heating device according to claim 9, characterized in that, A fuse (140) is provided on the line of the power line (110) inside the first cavity (210).

12. An air conditioner, characterized in that, It includes the electric heating device according to any one of claims 1 to 11.

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