CN207778570U - A kind of electric heater - Google Patents
A kind of electric heater Download PDFInfo
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- CN207778570U CN207778570U CN201721724556.0U CN201721724556U CN207778570U CN 207778570 U CN207778570 U CN 207778570U CN 201721724556 U CN201721724556 U CN 201721724556U CN 207778570 U CN207778570 U CN 207778570U
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Abstract
The utility model provides a kind of electric heater, including：The outlet grid made of nonmetallic materials and power-off restoration unit and/or the unit that automatically resets；Wherein, power-off restoration unit and/or the unit that automatically resets are connected in series in the major loop of electric heater, the temperature for controlling electric heater.The temperature of electric heater is controlled by the power-off restoration unit being connected in series in electric heater major loop and/or the unit that automatically resets, ensure that temperature of the electric heater under normal and abnormal condition rises the requirement for meeting nonmetallic materials, and major loop can also be quickly cut off in non-normal use, is further ensured that nonmetallic materials do not deform upon.It solves the problems, such as that the outlet grid of nonmetallic materials is yielding by the utility model, to ensure that the safe operation of electric heater, improves the reliability of system.
Description
Technical field
The utility model is related to technical field of electric appliances, and in particular to a kind of electric heater.
Background technology
It is gas outlet above convection-type electric heater case, lower section is air inlet, and the air around energization rear electrothermal tube is added
Heat rises, and is flowed out from gas outlet, and the cold air of surrounding enters supplement from air inlet, recycles repeatedly, and indoor temperature is made to obtain
To improve.
The outlet grid of convection-type electric heater is usually sheet metal component made of metal at present, and Fig. 1 is in the prior art
Metal material outlet grid dimensional structure diagram, this outlet grid one side sheet metal component need in the production process punching,
Blanking, molding at least three sets of molds also need to carry out spray treatment on surface after molding, and preparation section is complicated；Another aspect metal plate
The cost of golden material is higher, and will produce waste material after sheet metal component processing, and waste material also needs to centralized recovery processing.For above-mentioned existing
There is the deficiency in technology, outlet grid, which is made, using easy to process and lower-cost nonmetallic materials alternative metals material to solve
Certainly above-mentioned deficiency, Fig. 2 are the dimensional structure diagram of plastic material outlet grid in the prior art, and Fig. 3 is in the prior art
The front view of plastic cement outlet grid electric heater.The outlet grid one-pass molding of nonmetallic materials, no waste mine, the cost of material is low；Only need
A set of injection mold, die cost are low.But it will produce high temperature, excessively high Wen Sheng during the use of convection-type electric heater
Nonmetallic materials can be caused to deform.
Utility model content
In view of this, the utility model embodiment provides a kind of electric heater, to solve nonmetallic materials in the prior art
The yielding problem of outlet grid.
For this purpose, the utility model embodiment provides a kind of electric heater, including：The outlet grid made of nonmetallic materials,
And power-off restoration unit and/or the unit that automatically resets；Wherein, the power-off restoration unit and/or the unit that automatically resets series connection
It is connected in the major loop of the electric heater, the temperature for controlling the electric heater.
Optionally, the power-off restoration unit is used for when the temperature of the outlet grid is more than or equal to first threshold, control
The major loop disconnects.
Optionally, it is described automatically reset unit for when the outlet grid temperature more than or equal to second threshold and being less than
When the first threshold, controls the major loop and disconnect；And when the temperature of the outlet grid is less than the second threshold, control
Make the major loop conducting.
Optionally, the first threshold is 85 degrees Celsius, and the second threshold is 75 degrees Celsius.
Optionally, the power-off restoration unit is set to the front side of the outlet grid；And/or the unit that automatically resets is set
It is placed in the rear side of heater in the electric heater.
Optionally, the power-off restoration unit is power-off restoration temperature limiter；And/or the unit that automatically resets is automatic multiple
Position temperature limiter.
Optionally, the nonmetallic materials are plastic material.
Optionally, the plastic material is the polypropylene of 146 DEG C of ball pressure value.
Optionally, further include：Front housing, rear shell and protective device, wherein the outlet grid is set to the electric heater
Upside；The front housing is covered in the front side of the front side and the outlet grid of the electric heater, is fixed on the electric heater；It is described
Rear shell is covered in the rear side of the rear side and the outlet grid of the electric heater, is fixed on the electric heater；The protective device
It is covered in the left and right sides of the electric heater, is fixed on the electric heater.
The utility model embodiment technical solution, has the following advantages that：
1. the electric heater that the utility model embodiment provides, including：The outlet grid made of nonmetallic materials and power-off
Reset unit and/or the unit that automatically resets；Wherein, the power-off restoration unit and/or the unit that automatically resets are connected in series in institute
In the major loop for stating electric heater, the temperature for controlling the electric heater.It is disconnected in electric heater major loop by being connected in series in
It replies bit location by cable and/or the temperature for the unit control electric heater that automatically resets, ensures electric heater under normal and abnormal condition
Temperature rises the requirement for meeting nonmetallic materials, and major loop can also be quickly cut off in non-normal use, is further ensured that non-
Metal material does not deform upon.Solve the problems, such as that the outlet grid of nonmetallic materials is yielding by the utility model, to protect
The safe operation for having demonstrate,proved electric heater improves the reliability of system.
2. the electric heater that the utility model embodiment provides, power-off restoration unit is more than or equal to first when the temperature of outlet grid
When threshold value, power-off restoration unit controls major loop and disconnects, the connecting path cut off the power with electric heater, and electric heater is made to stop work
Make, needs to be powered again after pulling out power supply cooling, the temperature of outlet grid can be reduced in this way, prevent nonmetallic materials from deforming.
3. the electric heater that the utility model embodiment provides, the unit that automatically resets is more than or equal to second when the temperature of outlet grid
Threshold value and less than first threshold when, control major loop disconnect；And when the temperature of outlet grid is less than second threshold, control master
Circuit is connected.Second threshold is less than first threshold, and the unit that automatically resets first acts, and automatic Power resumption after cooling recycles always,
Make power-off restoration unit that operating temperature point be not achieved, ensures electric heater cooling outlet grid without pulling out power supply, protect
Card nonmetallic materials outlet grid does not deform.
4. power-off restoration unit, electric heater is arranged in the front side of outlet grid in the electric heater that the utility model embodiment provides
The unit that automatically resets is arranged in the rear side of middle heater, so that the whole installation of electric heater is more beautiful, and operation is more convenient.
5. the electric heater that the utility model embodiment provides, power-off restoration unit uses power-off restoration temperature limiter, automatic multiple
Bit location reduces whole production cost using the temperature limiter that automatically resets under the premise of meeting overall performance.
6. the electric heater that the utility model embodiment provides, outlet grid are made of plastic material, specially ball pressure value 146
DEG C polypropylene, this material be easy production and thermal stability it is good.
7. the electric heater that the utility model embodiment provides, further includes the upside that outlet grid is set to electric heater, is fixed on
On electric heater and the front housing on front side of electric heater and on front side of outlet grid is covered, is fixed on electric heater and covers on rear side of electric heater
With the rear shell on rear side of outlet grid, it is fixed on electric heater and covers the protective device at left and right sides of electric heater so that electric heater
It is more safe and reliable in use, and shield and prolong the service life to electric heater.
Description of the drawings
It, below will be right in order to illustrate more clearly of specific embodiment of the present invention or technical solution in the prior art
Specific implementation mode or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, it is described below
In attached drawing be that some embodiments of the utility model are not paying creativeness for those of ordinary skill in the art
Under the premise of labour, other drawings may also be obtained based on these drawings.
Fig. 1 is the dimensional structure diagram of metal material outlet grid in the prior art；
Fig. 2 is the dimensional structure diagram of plastic material outlet grid in the prior art；
Fig. 3 is the front view of plastic cement outlet grid electric heater in the prior art；
Fig. 4 is the dimensional structure diagram of the electric heater outlet grid provided in the utility model embodiment；
Fig. 5 is the front side structure schematic diagram of the electric heater provided in the utility model embodiment；
Fig. 6 is the rear structure schematic diagram of the electric heater provided in the utility model embodiment；
Fig. 7 is the exploded perspective view of the electric heater provided in the utility model embodiment；
Fig. 8 is the main loop circuit figure of the electric heater provided in the utility model embodiment；
Fig. 9 is the normal fever temperature rise curve figure of the electric heater provided in the utility model embodiment；
Figure 10 is the preceding half mulching temperature rise curve figure of the electric heater provided in the utility model embodiment；
Figure 11 is the rear half mulching temperature rise curve figure of the electric heater provided in the utility model embodiment；
Figure 12 is all standing temperature rise curve figure of the electric heater provided in the utility model embodiment；
Table 1 is that the convection-type electric heater outlet grid temperature provided in the utility model embodiment rises decision table.
Reference sign：
1- outlet grids；2- power-off restoration units；3- automatically resets unit；4- front housings；5- rear shells；6- protective devices；7- is sent out
Hot body；The first heaters of 71-；The second heaters of 72-；73- third heaters；The 4th heaters of 74-；81- power supplys；82- power supplys
Instruction device；83- rotary switches；84- adjustable temperature controllers.
Specific implementation mode
The technical solution of the utility model is clearly and completely described below in conjunction with attached drawing, it is clear that described
Embodiment is the utility model a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, originally
The every other embodiment that field those of ordinary skill is obtained without making creative work, belongs to this practicality
Novel protected range.
It is in the description of the present invention, it should be noted that term "center", "upper", "lower", "left", "right", " perpendicular
Directly ", the orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, and is only
The utility model and simplifying describes for ease of description, do not indicate or imply the indicated device or element must have it is specific
Orientation, with specific azimuth configuration and operation, therefore should not be understood as limiting the present invention.In addition, term " the
One ", " second ", " third " are used for description purposes only, and are not understood to indicate or imply relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " is pacified
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, can also be electrical connection；Can be directly connected, can also indirectly connected through an intermediary,
It can also be the connection inside two elements, can be wirelessly connected, can also be wired connection.For the common skill of this field
For art personnel, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
In addition, as long as technical characteristic involved in the utility model different embodiments disclosed below is each other
Not constituting conflict can be combined with each other.
Fig. 4 is the dimensional structure diagram of the electric heater outlet grid provided in the utility model embodiment, and Fig. 5 is this practicality
The front side structure schematic diagram of the electric heater provided in new embodiment, Fig. 6 are the electric heater provided in the utility model embodiment
Rear structure schematic diagram, Fig. 7 is the exploded perspective view of electric heater provided in the utility model embodiment.Such as Fig. 4, Fig. 5, figure
Shown in 6 and Fig. 7, electric heater provided in this embodiment, including：
Outlet grid 1 is set to the upside of heating element of electric heater 7, is made of nonmetallic materials.It is nonmetallic in the present embodiment
Material is plastic material, and plastic material is heat-resistance polypropylene (Polypropylene is abbreviated as PP), and ball pressure value is 146 DEG C, PP
The easy production of material, thermal stability is good, production cost is low；Certainly, in other embodiments, plastic material can also be poly- Asia
Phenyl sulphone resin (Polyphenylene sulfone resins, be abbreviated as PPSU) or polyethylene (polyethylene, contracting
It is written as PE), according to the structure of different electric heater products, type selecting is carried out to the resistance to temperature value of plastic material, ball pressure value, it can be according to experiment
It tests to determine, as needed rationally setting.
Power-off restoration unit and the unit that automatically resets are set on electric heater, are connected in series in the major loop of electric heater,
Temperature for controlling electric heater.Power-off restoration unit 2 is used for when the temperature of outlet grid 1 is more than or equal to first threshold, control
Major loop disconnects, and the connecting path cut off the power with electric heater makes electric heater be stopped, and needs again to lead to after pulling out power supply cooling
Electricity can reduce the temperature of outlet grid, prevent nonmetallic materials from deforming in this way.Automatically reset unit 3, for when outlet grid 1
When temperature is more than or equal to second threshold and is less than first threshold, control major loop disconnects, i.e. the connection of power supply and electric heater is logical
Road disconnects, and electric heater is in the state of cooling, and the temperature of outlet grid continuously decreases；And when the temperature of outlet grid 1 is less than the second threshold
When value, control major loop conducting, i.e., power supply is connected with the connecting path of electric heater, and electric heater is in heated condition, outlet grid
Temperature gradually rises.Second threshold is less than first threshold, and the unit that automatically resets first acts, automatic Power resumption after cooling, always
Cycle makes power-off restoration unit that operating temperature point be not achieved, and ensures electric heater cooling outlet air without pulling out power supply
Grid ensure that nonmetallic materials outlet grid does not deform.Certainly, in other embodiments, can also only include power-off restoration list
Member, as needed rationally setting.Fig. 8 is the main loop circuit figure of the electric heater provided in the utility model embodiment, Fig. 8
Include power supply 81, power-off restoration unit 2, the unit 3 that automatically resets, power source indicating device 82, heater 7, rotary switch 83 with
And adjustable temperature controller 84, wherein heater 7 includes four heaters, is followed successively by the first heater 71, the second heater 72, the
Three heaters 73 and the 4th heater 74.
In the present embodiment, power-off restoration unit 2 is set to the front side of outlet grid 1, and the unit 3 that automatically resets is set to electric heating
In device on the side plate of 7 rear side of heater, so that the whole installation of electric heater is more beautiful, and operation is more convenient；Certainly, exist
In other embodiments, power-off restoration unit 2 can also be set to the front side of outlet grid, the unit 3 that automatically resets is set to outlet air
The rigging position of the rear side of grid, the two can be determined according to experiment test, be rationally arranged as needed.
In the present embodiment, power-off restoration unit 2 is power-off restoration temperature limiter, and the unit 3 that automatically resets is the limit that automatically resets
Warm device can ensure to reduce whole production cost under the premise of meeting overall performance；Certainly, in other embodiments, power off
Reset unit 2 and the unit 3 that automatically resets can also be temperature detecting element and breaker, as needed rationally setting.
In the present embodiment, according to the characteristic of selected PP materials and power-off restoration unit 2 and the unit 3 that automatically resets
Installation site, first threshold is set as 85 degrees Celsius, second threshold is set as 75 degrees Celsius, on the one hand so that electric heater is defeated
Go out larger power, on the other hand ensures that outlet grid does not deform upon；Certainly, in other embodiments, first threshold and second
Threshold value may be arranged as other values, and such as 90 degrees Celsius and 70 degrees Celsius, concrete numerical value can be determined according to experiment test, root
According to needs rationally setting.
In order to enable electric heater is more safe and reliable in use, and shields to extend to electric heater and use
Service life further includes front housing 4, rear shell 5 and protective device 6, wherein front housing 4 is covered in electric heating on the basis of above-mentioned electric heater
The front side of the front side and outlet grid 1 of device, is fixed on electric heater；After rear shell 5 is covered in rear side and the outlet grid 1 of electric heater
Side is fixed on electric heater；Protective device 6 is covered in the left and right sides of electric heater, is fixed on electric heater.In the present embodiment
In, protective device 6 is metal protective screen；Certainly, in other embodiments, protective device 6 can also be Plastic Banded, Armour Piercing, Discarding Sabot guard,
Rationally setting as needed.
Above-mentioned electric heater is low using material cost and die cost and the simple plastic cement outlet grid cooperation of manufacture craft powers off
Reset unit and the unit that automatically resets, make the Wen Sheng of outlet grid meet the requirements, and then ensure that nonmetallic outlet grid does not deform upon；
Control the temperature of electric heater by the power-off restoration unit that is connected on complete machine main road and the unit that automatically resets, duplicate protection can be with
Temperature of the electric heater under normal and abnormal condition is effectively ensured and rises the requirement for meeting nonmetallic materials, and in non-normal use
When can also quickly cut off major loop, be further ensured that nonmetallic materials do not deform upon.
It is required according to GB 4706.1-2005, GB 4706.23-2007, the outlet grid of convection-type electric heater product, according to
Metal, it is nonmetallic divided, there is its corresponding temperature increase requirement on surface.Table 1 is pair provided in the utility model embodiment
The temperature liter of streaming electric heater outlet grid temperature liter decision table, metal or nonmetallic outlet grid needs to meet claimed below.
1 convection-type electric heater outlet grid temperature of table rises decision table
According to plastic material characteristic, during the test, during normal fever, the Wen Sheng (K)+40 of plastic cement outlet grid
(DEG C)≤non-metallic material pellet pressure value (DEG C), during Abnormal test, Wen Sheng (K)+25 (DEG C)≤non-metallic material pellet pressure value
(DEG C), meets conditions above, and plastic material will not deform upon.
Plastic cement outlet grid electric heater in the present embodiment, power-off restoration temperature limiter are placed in the front end of outlet grid, automatically reset
Temperature limiter is placed on the side plate on rear side of heating unit assembly, and the specific rigging position of temperature limiter is true according to a large amount of experimental test data
It is fixed；Two temperature limiters are connected in series on complete machine main road, whole break-makes during non-normal working.Wherein, outlet grid selects modeling
The heat-resisting PP of glue material, ball pressure value are 146 DEG C.National standard GB 4706.1-2005, GB 4706.23-2007 requirement under, outlet air
Grid interior groove, side wall are layouted with thermocouple on outer wall rib, and environment temperature is 23 ± 2 DEG C that standard requires.The 19th chapter just
Often under the conditions of fever, the 30th chapter Abnormal test, normal assays and Abnormal test are carried out to the outlet grid of electric heater.
Fig. 9 is the normal fever temperature rise curve figure of the electric heater provided in the utility model embodiment, the curve 1 in Fig. 9
Indicate that outlet grid internal temperature, curve 2 indicate power-off restoration cell temperature, curve 3 indicates the cell temperature that automatically resets, according to just
Often fever temperature rise curve can obtain：Two temperature limiter power-off restoration temperature limiters, the temperature limiters that automatically reset are not operating, outlet grid Wen Sheng
The temperature value for being calculated as curve 1 subtract test environment temperature value, temperature rises result and is less than 106 DEG C, meets plastic material ball pressure value
146 DEG C of requirement, outlet grid do not deform.
Figure 10 is the preceding half mulching temperature rise curve figure of the electric heater provided in the utility model embodiment, the curve in Figure 10
1 indicates that rib temperature on the outside of outlet grid, curve 2 indicate that power-off restoration cell temperature, curve 3 indicate the cell temperature that automatically resets, root
It can be obtained according to preceding half mulching temperature rise curve：The Wen Shengyu temperature limiter surface temperature rises of outlet grid form " race ", power-off restoration temperature limiter
It first acts, can not restore again, be powered again after power supply cooling can only be pulled out.Outlet grid temperature liter meets plastic material ball pressure value at this time
146 DEG C of requirement, outlet grid do not deform.
Figure 11 is the rear half mulching temperature rise curve figure of the electric heater provided in the utility model embodiment, the curve in Figure 11
1 indicates that outlet grid temperature, curve 2 indicate power-off restoration cell temperature, and curve 3 indicates the cell temperature that automatically resets, according to later half
Covering temperature rise curve can obtain：The Wen Shengyu temperature limiter surface temperature rises of outlet grid form " race ", and the temperature limiter that automatically resets first acts,
Energization is automatically replied after cooling, is recycled always, and operating temperature point is not achieved in power-off restoration, and outlet grid temperature liter meets plastic cement material at this time
The requirement of 146 DEG C of pellet pressure value, outlet grid do not deform.
Figure 12 is all standing temperature rise curve figure of the electric heater provided in the utility model embodiment, the curve 1 in Figure 12
Indicate that outlet grid temperature, curve 2 indicate power-off restoration cell temperature, curve 3 indicates the cell temperature that automatically resets, according to all standing
Temperature rise curve can obtain：The Wen Shengyu temperature limiter surface temperature rises of outlet grid form " race ", and the temperature limiter that automatically resets first acts, and are formed
Disconnection-recovery-disconnection-recovery, when restoring for second, power-off restoration temperature limiter reaches temperature operating point and disconnects, can not
Restoring again, is powered again after power supply cooling can only be pulled out, outlet grid temperature liter meets the requirement of 146 DEG C of plastic material ball pressure value at this time,
Outlet grid does not deform.
By being tested above it is found that the temperature of electric heater, which rises, meets standard requirement, plastic material will not deform upon.
As shown in fig. 7, electric heater includes front housing, rear shell, heater, outlet grid, this 5 part of protection net composition, each portion
Divide and contains corresponding parts, --- protection net --- outlet grid --- front housing --- rear shell that assemble sequence is according to heater
It assembles successively, improves efficiency of assembling.
Electric heater provided in this embodiment has following excellent under the premise of meeting electric heater product standard temperature increase requirement
Point：
1. low cost plastic rubber outlet grid reduces material, die cost, complete machine development cost is effectively reduced；
2. efficiency of assembling is high, plastic cement outlet grid assembly process is few, effectively reduces assembly work；
3. safe and reliable circuit protection, normal, non-normal use, Wen Sheng is satisfied by requirement, and non-normal use can
Protection in time；
4. the multi-faceted property of parameter type selecting, according to the structure of different product, to the resistance to temperature value of plastic material, ball pressure value type selecting,
Power-off restoration, the corresponding parameter of the temperature limiter that automatically resets, rigging position, according to experiment test come type selecting, to reach best guarantor
Shield.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
Among the protection domain that variation is created still in the utility model.
Claims (9)
1. a kind of electric heater, which is characterized in that including：The outlet grid made of nonmetallic materials and power-off restoration unit and/
Or the unit that automatically resets；Wherein, the power-off restoration unit and/or the unit that automatically resets are connected in series in the master of the electric heater
In circuit, the temperature for controlling the electric heater.
2. electric heater according to claim 1, which is characterized in that the power-off restoration unit is used for when the outlet grid
When temperature is more than or equal to first threshold, controls the major loop and disconnect.
3. electric heater according to claim 2, which is characterized in that it is described automatically reset unit for work as the outlet grid
When temperature is more than or equal to second threshold and is less than the first threshold, controls the major loop and disconnect；And work as the outlet air
When the temperature of grid is less than the second threshold, the major loop conducting is controlled.
4. electric heater according to claim 3, which is characterized in that the first threshold is 85 degrees Celsius, second threshold
Value is 75 degrees Celsius.
5. electric heater according to claim 1, which is characterized in that the power-off restoration unit is set to the outlet grid
Front side；And/or the unit that automatically resets is set to the rear side of heater in the electric heater.
6. electric heater according to claim 1, which is characterized in that the power-off restoration unit is power-off restoration temperature limiter；
And/or the unit that automatically resets is the temperature limiter that automatically resets.
7. electric heater according to claim 1, which is characterized in that the nonmetallic materials are plastic material.
8. electric heater according to claim 7, which is characterized in that the plastic material is the polypropylene of 146 DEG C of ball pressure value.
9. according to any electric heaters of claim 1-8, which is characterized in that further include：Front housing, rear shell and protection dress
It sets, wherein
The outlet grid is set to the upside of the electric heater；
The front housing is covered in the front side of the front side and the outlet grid of the electric heater, is fixed on the electric heater；
The rear shell is covered in the rear side of the rear side and the outlet grid of the electric heater, is fixed on the electric heater；
The guard covers are fixed in the left and right sides of the electric heater on the electric heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721724556.0U CN207778570U (en) | 2017-12-12 | 2017-12-12 | A kind of electric heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721724556.0U CN207778570U (en) | 2017-12-12 | 2017-12-12 | A kind of electric heater |
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| Publication Number | Publication Date |
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| CN207778570U true CN207778570U (en) | 2018-08-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108006794A (en) * | 2017-12-12 | 2018-05-08 | 珠海格力电器股份有限公司 | A kind of electric heater |
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2017
- 2017-12-12 CN CN201721724556.0U patent/CN207778570U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108006794A (en) * | 2017-12-12 | 2018-05-08 | 珠海格力电器股份有限公司 | A kind of electric heater |
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