CN210070024U

CN210070024U - Heat accumulation type electric heater with heat accumulator cast

Info

Publication number: CN210070024U
Application number: CN201920748687.5U
Authority: CN
Inventors: 王玉东; 黄召; 王玉纯; 王智全; 刘春荣
Original assignee: Hebei Qinnuan New Energy Technology Co Ltd
Current assignee: Hebei Qinnuan New Energy Technology Co Ltd
Priority date: 2019-05-23
Filing date: 2019-05-23
Publication date: 2020-02-14
Anticipated expiration: 2029-05-23

Abstract

The utility model discloses a heat accumulating type electric heater cast by a heat accumulator, which comprises an outer shell, wherein a grid cover is arranged above the outer shell, a skirt is arranged below the outer shell, and at least one fan is arranged at the bottom of the skirt; a heat accumulator is arranged in the outer shell, the heat accumulator is made of a casting type solid heat accumulation material, a plurality of air flow channels are uniformly arranged in the heat accumulator at intervals, the lower ends of the air flow channels are communicated with the interior of the skirt, and the upper ends of the air flow channels are communicated with the interior of the grid cover; an electric heater is arranged between every two adjacent airflow channels. The heat accumulator, the electric heater and the heat preservation layer of the utility model adopt a totally enclosed structure, are isolated from the outside air, can prevent the metal oxidation from going on, and prolong the service life of the related components; the closed structure becomes a thermodynamic closed system, heat exchange is carried out with the outside, no substance and mass exchange is carried out, zero emission of the system is realized, and the environment is protected. Water and water vapor or particles can not be immersed, and the safety protection level is higher.

Description

Heat accumulation type electric heater with heat accumulator cast

Technical Field

The utility model relates to a heat accumulation formula electric heater technical field especially relates to a fashioned heat accumulation formula electric heater is pour to heat accumulator.

Background

The existing heat accumulating type electric heater manufacturing structure in the current market is mainly a heat accumulator formed by prefabricated heat accumulating type brick piles or piled up, an electric heating element is placed in the central area of the heat accumulator, a heat insulating layer wraps the outside of the heat accumulator, and the outer package of the heat insulating layer is a metal shell. The problems with this structure are:

1. the structural pattern creates excessive thermal resistance, which deteriorates heat transfer.

Thermal resistance generation:

⑴ because the prefabricated heat-storage brick has no structure for placing the electric heater, the electric heater is floated in the heat-storage rotor, the electric heater is a circular tube, and can not be perfectly matched with the plane of the heat-storage rotor, and a larger gap and interval are left, and because the air heat conductivity coefficient is small, a large air heat resistance is generated.

⑵ the contact surface of the prefabricated heat storage bricks is uneven to form thermal contact resistance, the contact surface is in the shape of space surface grid, and envelops each prefabricated heat storage brick layer by layer, the specific surface area is 0.015m2 calculated by standard transformation size, the total surface area is 1.5m2 calculated by the weight of each equipment heat storage body of 100kg (the mass of 100kg of heat storage material is referred to as the heating area of 15m 2).

Due to the change of transportation or movement and constraint force, the combination of the shaped bricks is loosened, displacement or dislocation is generated, and gaps are enlarged, or the thermal storage shaped bricks are changed into air thermal resistance on the basis of thermal contact resistance.

⑶ the heat accumulator is jointed with the insulating layer, and the contact thermal resistance is formed due to the irregular surface of the heat accumulation material, the contact area is the external surface area of the heat accumulator and surrounds the whole heat accumulation material, that is, the contact thermal resistance is generated on the external surface area of the heat accumulator and surrounds the whole heat accumulator.

Thermal resistance hazard:

⑴ the heat generated by the electric heater cannot be timely transmitted out due to the summation of the above three thermal resistances, so as to generate a self-heating effect, so that the electric heating tube can be operated in an overheat state for a long time and can be burnt out prematurely.

⑵ the heat storage material is mostly non-metal, the heat conductivity is small, it is a general rule, the heat conductivity is small, the heat resistance is increased, the heat is hard to be input into the inner depth of the heat storage body, (the heat in the inner depth of the heat storage body is hard to be transferred to the outer surface), and the three heat resistances are superposed, the temperature difference of the heat storage temperature is increased, the maximum temperature can reach more than 300 ℃, the average heat storage temperature is reduced, the heat storage quantity is reduced 1/3, and the material utilization rate is reduced 1/3.

⑶ conduction is the main heat transfer mode of the structure, compared with convection and radiation, heat conduction is the mode with the minimum heat transfer coefficient, especially the heat transfer enters the low temperature section, the temperature pressure is reduced, according to the temperature difference heat transfer theory, the heat flow density is reduced, the heat of the low temperature section in the heat accumulator is not transferred out, and can not provide the participation in heating, so that the residual temperature of the heat accumulator for heating is increased, the heat actually supplied for heating is reduced in the heat accumulator, the heat of the temperature section is passed again in the next heat accumulation, the part of the heat which can not be utilized is statically retained in the heat accumulator, and accounts for about 20% of the total heat accumulation.

⑷ are limited by overheating and the heating element is under protection for a long time, making the power utilization less than 50%.

⑸ cause heat transfer to run away, the temperature field cannot be organized, or theoretically cannot be passed to create a thermal process design.

2. Pollution formation by open systems

The open type manufacturing of the heat accumulator and the heat insulation layer means that the heat accumulator, the heat insulation material and the electric heater are not closed and are directly communicated with the indoor air, and a thermodynamic open system is formed, namely, the inside of the equipment and the outside not only have heat exchange, but also have the exchange of substances and quality. Not only the control of the thermal process is complex and the difficulty is increased, but also the dust of the heat storage material and the heat insulation material, and the broken wadding, the falling scraps and the peculiar smell of the needled felt fiber escape along with the hot air flow, so that the heating room is full of the heat storage material and the heat insulation material, and the indoor environment and the air are deteriorated.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a fashioned heat accumulation formula electric heater is pour to heat accumulator, the problem of solution.

In order to solve the technical problem, the utility model adopts the following technical scheme:

the utility model relates to a heat accumulation type electric heater cast by a heat accumulator, which comprises an outer shell, wherein a grid cover is arranged above the outer shell, a skirt is arranged below the outer shell, and at least one fan is arranged at the bottom of the skirt; a heat accumulator is arranged in the outer shell and made of a casting type solid heat accumulation material, a plurality of air flow channels are uniformly arranged in the heat accumulator at intervals, the lower end of each air flow channel is communicated with the interior of the skirt, and the upper end of each air flow channel is communicated with the interior of the grid cover; and an electric heater is arranged between every two adjacent airflow channels.

Further, a heat insulation layer is arranged between the inner wall of the outer shell and the heat accumulator.

Furthermore, the cross-section of the grid cover is in a right trapezoid shape, two groups of strip grid holes are symmetrically formed in the front inclined plane of the grid cover, and two groups of annular grid holes which are distributed in a circular shape are symmetrically formed in the top of the grid cover.

Furthermore, the upper part of the grille cover is provided with an air door adjusting mechanism.

Further, air door adjustment mechanism including set up in the screw thread knob of grid cover top, the one end threaded connection of screw thread knob and screw rod, the other end of screw rod passes the roof of grid cover extends to the inside of grid cover and the contact position of the roof of screw rod and grid cover pass through the sliding sleeve with the roof sliding fit of grid cover, the screw rod is located the inside one end of grid cover is in proper order with bimetallic strip and air door cover fixed connection just the air door cover sets up in a plurality of directly over the airflow channel upper end.

Furthermore, two bimetallic strip frameworks are symmetrically arranged at two side ends in the grid cover, and two ends of each bimetallic strip are respectively and fixedly inserted into the lower parts of the two bimetallic strip frameworks.

Furthermore, two groups of trundles are symmetrically arranged below the skirt.

Furthermore, each electric heater includes the tubular metal resonator, the lower extreme of tubular metal resonator with the bottom plate fixed connection of shell body, fixedly on the periphery wall of tubular metal resonator being provided with the spiral fin, the inside of tubular metal resonator is provided with the heating wire.

Further, the heating wire including set up in the metal tube is inside and is spiral helicine heating segment, the both ends of heating segment are inlet wire end and return wire end respectively, inlet wire end downwardly extending extremely the outside of metal tube, the return wire end is followed pass and downwardly extending extremely in the middle of the inside of heating segment the outside of metal tube, the return wire end is located the outside cover at the position in the middle of the heating segment is equipped with the porcelain tube, inlet wire end and return wire end are located the outside at the outside position of metal tube all is equipped with protective casing and tip and links to each other with the power.

Furthermore, an insulating filler is arranged between the inner wall of the metal tube and the outer wall of the porcelain tube, and a high-temperature-resistant sealant is arranged at the lower end of the metal tube.

Compared with the prior art, the utility model discloses a beneficial technological effect:

the heat accumulator, the electric heater and the heat preservation layer of the utility model adopt a totally enclosed structure, are isolated from the outside air, can prevent the metal oxidation from going on, and prolong the service life of the related components; the closed structure becomes a thermodynamic closed system, heat exchange is carried out with the outside, no substance and mass exchange is carried out, zero emission of the system is realized, and the environment is protected. Water and water vapor or particles can not be immersed, and the safety protection level is higher.

The utility model discloses a spiral fin of electric heater kind adds outside the metal tube, is pour integratively by heat accumulation material. Because the metal heat conductivity coefficient is higher than nonmetal, the spiral fins are seamlessly combined with the heat accumulator to be used as a heat bridge to quickly transfer heat emitted by the electric heating element to a far place, the heat storage and heat transfer of the heat storage material are promoted, the defect of low heat conductivity coefficient of the heat storage material is compensated, the heat in the deep part of the heat accumulator is normally stored and output, the electric heating element is basically not protected by overheating, and the power utilization rate is improved by more than 35%. And simultaneously, the heat storage time is shortened by over 35 percent.

The heating section of the electric heating wire is spirally arranged in the center of the metal pipe, so that the heat of the electric heating wire can be transferred to the surrounding metal pipe wall at equal intervals and is uniformly transferred to the heat accumulator, the temperature field in the heat accumulator is distributed at equal temperature, the anisotropy of the temperature field caused by non-equal-distance heat transfer is avoided, and under the condition that the highest heat accumulation temperature is not changed, the lowest heat accumulation temperature is reduced, so that the effective heat accumulation amount of the heat accumulator is reduced and the heat accumulation utilization rate of the heat accumulator material quality is reduced; the heating section has reasonable distance from the outer diameter to the tube wall, so that short circuit and tube wall breakdown can be effectively avoided; the eccentric heating of the electric heating element is avoided, so that the bending deformation of the electric heating tube caused by the low temperature at the high temperature side of one side of the metal tube can not work normally; the diameter and the expansion length of the heating section of the electric heating wire are reasonably selected, so that the problems that the diameter of a spiral wire for eccentrically placing an electric heating element is reduced, the length is reduced, the durability is reduced, and the failure rate is increased are avoided; the structure can meet the national standard requirements on leakage current, electrical strength (high voltage breakdown resistance) and grounding resistance under the condition of normal power output, and can effectively transfer heat; because structural design is reasonable reliable, the electric heater fault rate is low or zero trouble, under the unable circumstances of changing of electric heater, ensures not to make the heat accumulation formula electric heater can not work because of electric heater trouble.

The utility model discloses a cast fashioned heat accumulator structure and the multiple joint connection that adopts shaping heat accumulation type brick to make heat accumulation type electric heater compare, and the cast shaping heat accumulator makes the inside seamless combination that realizes of heat accumulation material, also realizes seamless connection with the heat preservation, and air thermal resistance between electric heater and the heat accumulator, thermal contact resistance or air thermal resistance between the heat accumulation type brick, thermal contact resistance between heat accumulation type brick and the heat preservation have all not been saved, only has the thermal resistance of heat accumulation material itself. The heat resistance is greatly reduced to optimize heat transfer. The heat insulation layer is reasonably matched in thermal resistance, so that the heat storage temperature difference of the heat accumulator is reduced, and the surface temperature of the shell is not overheated, so that the increase of the average heat storage temperature can improve the heat storage capacity and the utilization rate of the heat storage material by more than 20 percent, the surface temperature of the shell does not exceed the standard specification, and the sufficient heat storage capacity of the heat accumulator is controllably released through the outer surface; the castable has the advantages of fluidity, workability, filling property, and moving and shaping property, thereby having good formability, simple structure, reduced volume, high forming strength, plastic forming, easy optimization of style and the like.

The utility model discloses an air door adjustment mechanism can realize manual and automatic two kinds of modes's regulation and control to convection heat channel: the manual adjustment is simple, convenient and easy to operate. The automatic adjustment is realized by a mechanical cover type adjusting mechanism under the condition of no automatic control facility, and the mechanism is reasonable. Can accurately and sensitively reach the adjustment target, and has no fault, stable function and durable components.

The pipeline structure is added in the heat accumulator, so that the heat storage in the heat accumulator transfers heat in a single conduction mode, a convection heat transfer mode is added, and the heat transfer is enhanced. The airflow channel is built into a whole by heat storage materials, no gap and thermal contact resistance exist, and the heat of the surrounding heat storage body is easily transferred to the pipe wall. Convection current can make the heating residual temperature reduce, if the fan helps, the heating residual temperature can be reduced to a little more than the room temperature, like this, heat accumulation capacity more than 20% can effectively be utilized, this part of heat has been survived in the dish, the disadvantage of having eliminated and built fashioned heat accumulation formula electrical heating equipment by heat accumulation type brick, the heat that makes the in-service heating increases, extension heating time, heat accumulation initial temperature once more can be followed a little more than the room temperature and started, the interval increase of heat accumulation temperature, of course, the heat accumulation capacity increases.

Drawings

The present invention will be further explained with reference to the following description of the drawings.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic sectional view of the present invention;

FIG. 3 is a schematic view of an electric heater;

FIG. 4 is a schematic view of the damper adjustment mechanism in a manually adjusted position;

FIG. 5 is a schematic view of the maximum opening state of the damper adjustment mechanism;

FIG. 6 is a schematic view of the damper adjustment mechanism automatically adjusting the adjustment process;

FIG. 7 is a schematic view of the minimum opening state of the damper adjustment mechanism for automatic adjustment;

FIG. 8 is a graph illustrating the relationship between the temperature of the hot gas stream (i.e., the temperature of the heat storage), the opening of the damper, and the time τ;

FIG. 9 is a graph showing the relationship between the flow rate of hot gas and the temperature of hot gas (i.e., the temperature of the heat storage) and the time τ;

description of reference numerals: 1. an outer housing; 2. a grille cover; 3. a skirt; 4. a fan; 5. a heat accumulator; 6. An air flow channel; 7. an electric heater; 8. a strip grid hole; 9. annular grating holes; 10. a heat-insulating layer; 11. A caster wheel; 12. a metal tube; 13. spiral ribs; 14. an electric heating wire; 14-1, a heating section; 14-2, a wire inlet end; 14-3, a return wire end; 15. a porcelain tube; 16. sheathing a pipe; 17. insulating filler; 18. high-temperature resistant sealant; 19. a threaded knob; 20. a screw; 21. a sliding sleeve; 22. a bimetal; 23. a damper cover plate; 24. A bimetallic strip frame.

Detailed Description

As shown in fig. 1-2, a heat accumulating type electric heater with a pouring formed heat accumulator comprises an outer shell 1, an air chamber of the electric heater is formed by a grid cover 2 arranged above the outer shell 1, and the grid cover 2 is matched with the upper part of the outer shell 1 in size and is fastened and connected through an anti-dropping screw. And the cross-section of grid cover 2 is right trapezoid, two sets of rectangular grid holes 8 have been seted up to the symmetry on the anterior inclined plane of grid cover, the top symmetry of grid cover 2 is provided with two sets of hoop grid holes 9 that are circular distribution, and the steam that the room heater during operation produced by rectangular grid hole 8 and hoop grid hole 9 on grid cover 2 escape, form the circulation with the room air.

The lower part of shell body 1 is provided with skirt 3, the bottom of skirt 3 is provided with at least one fan 4, the air outlet of fan 4 with the inside of skirt 3 is linked together. Two sets of truckles 11 are installed to the below symmetry of skirt 3, and truckles 11 are the universal formula in order to make things convenient for the removal of whole room heater to the rim is insulating with ground.

The heat preservation device is characterized in that a heat accumulator 5 is arranged inside the outer shell 1, a heat preservation layer 10 is arranged between the inner wall of the outer shell 1 and the heat accumulator 5, and the thickness of the heat preservation layer 10 can be calculated according to the heat resistance required by the heat preservation layer and the heat conductivity coefficient of the heat preservation layer during specific selection.

A plurality of gas flow passages 6 are provided in the heat storage body 5 at regular intervals, the gas flow passages 6 are made of heat-resistant metal tubes, and the number of the gas flows is specifically set to 3 in this embodiment. The lower end of each air flow channel 6 is communicated with the interior of the skirt 3, and the upper end of each air flow channel is communicated with the interior of the grille cover 2; an electric heater 7 is arranged between every two adjacent airflow channels.

The utility model provides a heat accumulator 5 is for pouring into the shaping formula solid heat accumulation material, and it includes following weight percent's component: 55% of basalt, 0.5% of polycarboxylic acid water reducing agent, 1% of sodium silicate, 1% of water and the balance of iron powder. And mixing the components in proportion to obtain the solid heat storage material.

When the utility model is manufactured, firstly, the metal plate is made into the outer shell with the box-shaped structure with the upper part opened, then the airflow duct and the electric heater 7 are installed at the bottom of the outer shell 1 by welding, and the heat preservation layer 10 is installed at the bottom and the inner side wall of the outer shell 1; then pouring the solid heat storage material into an outer shell, heating the poured heat storage body to 100-300 ℃, and finishing curing and damp clearing after 24 hours; heating to 600 deg.C for 12 hr, sintering, strengthening, and removing odor; and finally, laying an insulating layer on the heat accumulator forming surface, and closing the top plate of the outer shell by using a welding method.

As shown in fig. 3. Each electric heater 7 includes tubular metal resonator 12, tubular metal resonator 12 the lower extreme with the bottom plate fixed connection of shell body 1, the fixed spiral fin 13 that is provided with on the periphery wall of tubular metal resonator 12, tubular metal resonator 12 with the spiral fin seals in the heat accumulator and is built integratively by the heat accumulator.

An electric heating wire 14 made of high-resistance electrothermal alloy is installed inside the metal tube 12, the electric heating wire 14 comprises a spiral heating section 14-1 arranged inside the metal tube 12, two ends of the heating section 14-1 are respectively a wire inlet end 14-2 and a wire return end 14-3, the wire inlet end 14-2 extends downwards to the outside of the metal tube 12, and the wire return end 14-3 penetrates through the middle inside of the heating section 14-1 and extends downwards to the outside of the metal tube 12. The ceramic tube 15 is sleeved outside the part, located in the middle of the heating section 14-1, of the loop end 14-3, and the ceramic tube 15 can protect the loop end 14-3 and insulate the loop end. The porcelain tube 15 and the heating section 14-1 are arranged coaxially with the metal tube 12. The outer sides of the parts of the wire inlet end 14-2 and the wire return end 14-3, which are positioned outside the metal pipe 12, are both sleeved with a protective sleeve 16, and the end parts of the protective sleeve are connected with a power supply. An insulating filler 17 is arranged between the inner wall of the metal tube 12 and the outer wall of the porcelain tube 15, and a high-temperature-resistant sealant 18 is arranged at the lower end of the metal tube 12, so that the whole electric heating wire is sealed in the metal tube and isolated from the outside.

The utility model discloses an electric heater can avoid the influence of heat conduction directionality, avoids hot uploading regularity promptly, makes to be located the heating wire of lower part can heat the heating wire that is located upper portion, makes heating wire and heat accumulator structure cool down and go up hot to electric heating element is overheated above making.

The upper portion of grille cover 2 is provided with air door adjustment mechanism, air door adjustment mechanism including set up in the screw thread knob 19 of grille cover 2 top, screw thread knob 19 and screw rod 20's one end threaded connection, the other end of screw rod 20 passes the roof of grille cover 2 and extends to the inside of grille cover 2 and the contact site of screw rod 20 and the roof of grille cover 2 pass through sliding sleeve 21 with the roof sliding fit of grille cover 2, screw rod 20 is located the inside one end of grille cover 2 is in proper order with

bimetallic strip

22 and 23 fixed connection of air door apron just air door apron 23 sets up in a plurality directly over airflow channel 6 upper end. Two bimetallic strip frameworks 24 are symmetrically arranged at two side ends in the grating cover 2, and two ends of the bimetallic strip 22 are respectively fixedly inserted at the lower parts of the two bimetallic strip frameworks 24.

The utility model discloses a heat transfer passage has two kinds of modes, one kind comprises the inside airflow channel of fan, skirt, heat accumulator, air door adjustment mechanism and the grid hole that the grid covered, is heat convection mode passageway. The heat flow density of the convection heat transfer depends on the wall temperature of the heat body and the flow rate of the heat flow, the heat transfer coefficient is higher than that of the conduction mode, and the control aim is to adjust the flow rate of the air flow. The other one is composed of an electric heater, a heat accumulator, a heat-insulating layer and an outer shell and is a heat conduction way channel. The heat that the heating wire sent transmits the heat accumulator for through tubular metal resonator and spiral floor, and the heat accumulator heat accumulation back passes heat preservation, shell body wall, to indoor conduction and radiation, and four surfaces around the heat accumulator can remain higher temperature throughout, sustainably release the heat.

The heat output regulation and control of the heat convection channel are mainly realized by a damper regulating mechanism.

On one hand, the air door adjusting mechanism can be manually adjusted, namely as shown in fig. 4, at the moment, the lower end of the threaded knob 19 is tightly attached to the upper end of the sliding sleeve 21, the threaded knob 19 is rotated to enable the screw rod 20 to move up and down, and then the distance between the air door cover plate 23 and the air flow channel 6 is adjusted, namely, the opening degree of the air door is adjusted. When the warmer works, the temperature of hot air flow generated in the air flow channel 6 rises, the bimetallic strip 22 has the tendency of deformation and bending after being heated, but the threaded knob 19 is tightly attached to the sliding sleeve 21 to limit the screw rod 20 to move downwards, so that the bimetallic strip 22 cannot generate bending deformation and cannot drive the air door cover plate 23 to move downwards, and the opening degree of the air door is kept constant.

On the other hand, the damper adjusting mechanism can perform automatic adjustment, as shown in fig. 5, at this time, the threaded knob 19 has a certain distance from the upper end of the sliding sleeve 21, and the deformation degree of the bimetal 22 can be limited by adjusting the relative distance between the threaded knob 19 and the sliding sleeve 21, so that the movement stroke of the screw 20 and the damper cover plate 23 is controlled, and the maximum opening degree of the damper can be adjusted.

Under the automatic regulation state, the temperature of hot air flow in the air flow channel rises, so that the bimetallic strip 22 deforms and bends downwards, the screw 20 and the wind shielding cover plate 23 are driven to move downwards, the deformation degree of the bimetallic strip 22 is a function of the temperature t, the distance from the wind shielding cover plate 23 to the upper end opening of the air flow channel 6 is gradually reduced along with the temperature rise, the air flow is correspondingly reduced, the bimetallic strip deforms and returns along with the temperature fall, the opening k of the air door is gradually increased, and the air flow is correspondingly increased.

As shown in fig. 5-7, the autoregulating state begins in fig. 5 when the damper opening is at a maximum, and as the temperature increases, passes through the fig. 6 position to the fig. 7 position when the damper opening is at a minimum. And (3) passing through the position of figure 6 and returning to the position of figure 5 along with the temperature reduction, thereby completing the adjustment of one heat storage heating cycle period. The temperature corresponding to the maximum opening and the minimum opening of the air door is the temperature range of the adjustment and also the corresponding hot air flow range, when the opening of the air door is large, the hot air flow is large, otherwise, the flow is small, and simultaneously, the corresponding deformation range of the bimetallic strip under the influence of the temperature is also corresponding.

As shown in fig. 8, t is a hot air temperature (i.e., heat accumulator temperature) curve, k is a damper opening curve, which are distributed in an inverse symmetry manner, the highest temperature of the hot air (i.e., heat accumulator) corresponds to the minimum opening of the damper, and the lowest temperature of the hot air (i.e., heat accumulator) corresponds to the maximum opening of the damper.

The principle of the automatic adjusting function of the air door adjusting structure is as follows: the deformation of the bimetal along with the temperature drives the change of the opening of the air door, so that the adjustment that the temperature of the airflow rises, the flow rate decreases, and the temperature of the airflow decreases, and the flow rate increases is realized.

The regulation theory is according to the Newton's cooling formula, satisfying the following relation:

the output heat flow density Q is equal to the gas flow temperature difference (△ t) x gas specific heat capacity (cp) x gas flow rate (Q) is equal to a constant.

To achieve a constant heat output.

As shown in FIG. 9, Q is the hot gas flow curve and Q is the hot flow density curve. When the temperature of hot air (namely the temperature of a heat accumulator) changes continuously, the flow of the air flow is changed along with the change of the output heat flow density q, and the product of the three factors of the calculation formula is still kept unchanged, namely q is constant and is expressed as a straight line on a graph q, so that the constant output heat flow density is finally realized, and the constant-temperature heating is realized.

The heat transfer of heat conduction depends on the temperature and pressure and the thermal resistance of each layer of object on the heat transfer chain, and the heat flow is equal to the temperature and pressure divided by the thermal resistance. The thermal resistance is unchanged, the temperature and pressure are large, and the heat flux density is large. The temperature and pressure are not changed, the thermal resistance is large, and the heat flux density is small. And calculating and determining the thermal resistance and the thickness of each heat transfer layer according to the Fourier law, and designing a structure meeting the heat transfer requirement.

The convection heat transfer and the conduction heat transfer jointly form heating for the indoor space. The overall control objectives are: the heating heat demand is balanced with the sum of the convection heat transfer quantity and the conduction heat transfer quantity, and the sum of the convection heat transfer quantity and the conduction heat transfer quantity is balanced with the heat storage quantity of the heat storage body.

The above-mentioned embodiments are only intended to describe the preferred embodiments of the present invention, but not to limit the scope of the present invention, and those skilled in the art should also be able to make various modifications and improvements to the technical solution of the present invention without departing from the spirit of the present invention, and all such modifications and improvements are intended to fall within the scope of the present invention as defined in the appended claims.

Claims

1. The utility model provides a fashioned heat accumulation formula electric heater is pour to heat accumulator which characterized in that: the air purifier comprises an outer shell (1), wherein a grid cover (2) is arranged above the outer shell (1), a skirt (3) is arranged below the outer shell (1), and at least one fan (4) is arranged at the bottom of the skirt (3); a heat accumulator (5) is arranged in the outer shell (1), the heat accumulator (5) is made of a casting type solid heat accumulation material, a plurality of airflow channels (6) are uniformly arranged in the heat accumulator (5) at intervals, the lower end of each airflow channel (6) is communicated with the interior of the skirt (3), and the upper end of each airflow channel is communicated with the interior of the grille cover (2); an electric heater (7) is arranged between every two adjacent airflow channels.

2. A heat accumulating electric heater cast by a heat accumulator according to claim 1, characterized in that: and a heat insulation layer (10) is arranged between the inner wall of the outer shell (1) and the heat accumulator (5).

3. A heat accumulating electric heater cast by a heat accumulator according to claim 1, characterized in that: the cross-section of grid cover (2) is right trapezoid, two sets of rectangular grid holes (8) have been seted up to the symmetry on the anterior inclined plane of grid cover, the top symmetry of grid cover (2) is provided with two sets of hoop grid holes (9) that are circular distribution.

4. A heat accumulating electric heater cast by a heat accumulator according to claim 1, characterized in that: and the upper part of the grille cover (2) is provided with an air door adjusting mechanism.

5. A heat accumulating type electric heater cast by a heat accumulator according to claim 4, characterized in that: air door adjustment mechanism including set up in screw thread knob (19) of grid cover (2) top, screw thread knob (19) and the one end threaded connection of screw rod (20), the other end of screw rod (20) passes the roof of grid cover (2) extends to the inside of grid cover (2) and the contact site of screw rod (20) and the roof of grid cover (2) pass through sliding sleeve (21) with the roof sliding fit of grid cover (2), screw rod (20) are located grid cover (2) inside one end is successively with bimetallic strip (22) and air door apron (23) fixed connection just air door apron (23) set up in a plurality of directly over airflow channel (6) upper end.

6. A heat accumulating type electric heater cast by the heat accumulator according to claim 5, characterized in that: two bimetallic strip frameworks (24) are symmetrically arranged at two side ends in the grating cover (2), and two ends of the bimetallic strip (22) are respectively fixedly inserted at the lower parts of the two bimetallic strip frameworks (24).

7. A heat accumulating electric heater cast by a heat accumulator according to claim 1, characterized in that: two groups of trundles (11) are symmetrically arranged below the skirt (3).

8. A heat accumulating electric heater cast by a heat accumulator according to claim 1, characterized in that: each electric heater (7) includes tubular metal resonator (12), the lower extreme of tubular metal resonator (12) with the bottom plate fixed connection of shell body (1), fixedly on the periphery wall of tubular metal resonator (12) be provided with spiral fin (13), the inside of tubular metal resonator (12) is provided with heating wire (14).

9. A heat accumulating electric heater cast by a heat accumulator according to claim 8, wherein: the electric heating wire (14) comprises a spiral heating section (14-1) arranged in the metal pipe (12), two ends of the heating section (14-1) are respectively a wire inlet end (14-2) and a wire return end (14-3), the wire inlet end (14-2) extends downwards to the outside of the metal pipe (12), the wire return end (14-3) penetrates through the middle of the inside of the heating section (14-1) and extends downwards to the outside of the metal pipe (12), a porcelain tube (15) is sleeved outside the position of the loop end (14-3) positioned in the middle of the heating section (14-1), the outer sides of the parts of the wire inlet end (14-2) and the wire return end (14-3) which are positioned outside the metal pipe (12) are both sleeved with a protective sleeve (16), and the end parts of the protective sleeve are connected with a power supply.

10. A heat accumulating electric heater cast by a heat accumulator according to claim 9, characterized in that: an insulating filler (17) is arranged between the inner wall of the metal tube (12) and the outer wall of the porcelain tube (15), and a high-temperature-resistant sealant (18) is arranged at the lower end of the metal tube (12).