CN108423022B - Warm-air drier circuit and driver's cabin electric fan heater thereof - Google Patents
Warm-air drier circuit and driver's cabin electric fan heater thereof Download PDFInfo
- Publication number
- CN108423022B CN108423022B CN201810359534.1A CN201810359534A CN108423022B CN 108423022 B CN108423022 B CN 108423022B CN 201810359534 A CN201810359534 A CN 201810359534A CN 108423022 B CN108423022 B CN 108423022B
- Authority
- CN
- China
- Prior art keywords
- heating
- fan
- temperature control
- temperature
- heating element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000010438 heat treatment Methods 0.000 claims abstract description 96
- 238000005485 electric heating Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims description 14
- 239000002918 waste heat Substances 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 238000009423 ventilation Methods 0.000 claims description 5
- 238000010583 slow cooling Methods 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 230000003137 locomotive effect Effects 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000035807 sensation Effects 0.000 description 2
- 230000004323 axial length Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009323 psychological health Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61D—BODY DETAILS OR KINDS OF RAILWAY VEHICLES
- B61D27/00—Heating, cooling, ventilating, or air-conditioning
- B61D27/0036—Means for heating only
- B61D27/0045—Electric heating
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Air-Conditioning For Vehicles (AREA)
Abstract
The invention belongs to the technical field of locomotive warm air components, and discloses a warm air blower circuit and a cab warm air blower thereof. The contactor is used for controlling the heating element in the heating loop to heat, so that the low-voltage control high voltage is realized, the circuit stability is ensured, and the heating element is ensured to keep working normally; the fin type electric heating tube is adopted, so that the heating area is large, the heat loss is small, and the electric heating tube has the advantages of fast temperature rise, uniform heating, high electric heating conversion efficiency and the like.
Description
Technical Field
The invention relates to the technical field of locomotive warm air components, in particular to a warm air blower circuit and a cab warm air blower thereof.
Background
The cab heating device is an important part of a locomotive cab and is used for coping with winter coldness, can provide a comfortable working environment for crews, is beneficial to the physical and psychological health of the crews, but has larger limitation in installation due to the narrow space and the complex layout of the cab, and most of heating devices used on the existing locomotive are installed in a wall-mounted mode, so that the heating devices occupy part of the space in the locomotive cab, influence the overall aesthetic feeling of the cab, and are not beneficial to overhaul and maintenance of the heating devices.
In addition, the current heating equipment (warm air blower) mainly comprises a shell, wherein a hot air outlet is arranged on the side wall of the shell, an electric heater is arranged at the position corresponding to the hot air outlet in the shell, and a fan is arranged at the rear side of the electric heater. When the electric heater is used, the electric heater and the fan are connected with a power supply in the cab through wires, then the electric heater and the fan are started simultaneously, the electric heater heats air in the shell, and the fan blows out hot air in the shell, so that warm air is formed. However, the heating temperature cannot be adjusted by the arrangement, and on the other hand, the electric heater and the fan are powered on and off simultaneously, so that the waste heat of the electric heater cannot be effectively ensured to be completely dispersed outside the shell.
Disclosure of Invention
The invention solves the technical problem of providing a fan heater circuit with reliable performance aiming at the defects of the prior art.
The invention also provides a cab warm air blower with the warm air blower circuit.
The aim of the invention is achieved by the following technical scheme:
The utility model provides a warm-air drier circuit, includes control circuit and heating circuit, and control circuit includes the contactor coil, and the heating circuit includes parallelly connected branch road and the fan branch road that generates heat, and the branch road that generates heat includes the contactor contact and with the heating element of contactor contact series connection, and the fan branch road includes the fan that is used for giving off the heat that heating element produced to the chassis outside.
Further, the heating branch is provided with a plurality of heating elements which are connected in parallel.
Further, the heating element is a fin type electric heating tube.
Further, the fan is a cross-flow fan.
Further, a fuse is connected in series in the control loop.
Further, the fuse has a fusing temperature of 121 ℃.
Furthermore, at least one temperature control switch is connected in series in the control loop.
Still further, the control temperature of the temperature control switch is 80 ℃.
Further, a delay relay coil connected with the contactor coil in parallel is also arranged in the control loop, and a delay relay contact is connected in series in the fan branch.
Further, the delay time of the delay relay is 30 seconds.
The fan heater for the cab comprises a case, wherein the fan heater circuit is arranged in the case, an air channel is formed in the space around a heating element, a fan is arranged above or below the heating element, and the case wall of the case at the arrangement position of the heating element and the fan is in a grid ventilation structure.
Compared with the prior art, the invention has the following beneficial effects:
1) The contactor is used for controlling the heating element in the heating loop to heat, so that the low-voltage control high voltage is realized, the circuit stability is ensured, and the heating element is ensured to keep working normally;
2) The heating element adopts a fin type electric heating tube, the heating area is large, the heat loss is reduced, and compared with the common electric heating tube, the heating element has the advantages of quick temperature rise, uniform heating, high electric heating conversion efficiency and the like under the same power;
3) The space around the heating element forms an air channel, so that the resistance is small, and the cross-flow fan can timely radiate heat to the outside of the case;
4) The temperature control switches are arranged, the arrangement positions of the temperature control switches in the case are different, and the environmental temperatures of different positions in the case can be monitored in real time, so that a reference can be provided for the uniform condition of the overall temperature in the air duct, and once the condition of overhigh temperature occurs, the temperature control switches are automatically disconnected, so that a heating loop is disconnected, and the temperature regulation and control of the overall heating condition are realized;
5) The delay relay can ensure that the fan still keeps normal air suction and blowing actions after the heating element is powered off, so that the waste heat of the heating element is completely dispersed outside the machine case, heat is prevented from being accumulated in the machine case, and the service life of the fan heater is effectively prolonged;
6) The cab warm air blower has the characteristics of high electric heat conversion efficiency, fast temperature rise, strong heat sensation, no open fire, no light consumption, safety, reliability and the like, can be installed on various vehicle types, is particularly suitable for being installed on a power centralized train, is installed in a cab rear wall side cabinet, does not occupy a large amount of cab space, is concise and attractive, and can provide a proper heating environment for a cab.
Drawings
Fig. 1 is a schematic view of the internal structure of a fan heater for a cab according to embodiment 1;
FIG. 2 is a side view of FIG. 1;
FIG. 3 is a schematic diagram of a chassis panel structure;
fig. 4 is a circuit schematic diagram of the fan heater according to embodiment 1.
Detailed Description
The present invention will now be described further in connection with the following detailed description, wherein the drawings are for purposes of illustration only and are not intended to be limiting; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Example 1
The fan heater for the cab, as shown in fig. 1, comprises a machine case 1, wherein a fan heater circuit shown in fig. 4 is arranged in the machine case 1, the fan heater circuit comprises a control loop 2 and a heating loop 3, the control loop 2 comprises a contactor coil 21, the heating loop 3 comprises a heating branch and a fan branch which are connected in parallel, the heating branch comprises a contactor contact 31 and a heating element 32 connected with the contactor contact 31 in series, and the fan branch comprises a fan 33 used for radiating heat generated by the heating element 32 to the outside of the machine case 1.
The contactor coil 21 and the contactor contacts 31 are a set of integral contactors. The power supply voltage connected with the control loop 2 is 110V, the power supply voltage connected with the heating loop 3 is 220V, wires in each loop are intensively transferred into the chassis 1 through the connector 6, and the heating element 32 in the heating loop is controlled to generate heat by the contactor in the embodiment, so that the low-voltage control high voltage is realized, the stability of the circuit is ensured, and the heating element is ensured to keep working normally.
As shown in fig. 1 and fig. 2, the space around the heating element 32 forms an air duct 4, the fan 33 is arranged above or below the heating element 32 (the above or below refers to the physical upper and lower positions after the chassis is installed), as shown in fig. 3, the chassis wall of the chassis 1 at the installation position of the heating element 32 and the fan 33 is provided with a grid ventilation structure 11, the grid ventilation structure 11 corresponding to the heating element 32 can effectively ensure that sufficient air flows in the fan heater, and the grid ventilation structure 11 corresponding to the fan 33 can make the heated air diffuse out of the chassis in time to provide a comfortable environment for a cab.
The heating element of this embodiment is not provided with related space-occupying parts around, and the air duct 4 has small resistance, which is beneficial for the fan 33 to timely radiate heat out of the chassis 1.
In order to realize rapid temperature rise of the cab, a plurality of heating elements 3 are arranged on the heating branch and are connected in parallel (three in the embodiment), and the plurality of heating elements heat simultaneously, so that the heating efficiency can be improved by times.
The heating element 3 adopts a fin type electric heating tube, has large heating area and reduced heat loss, and has the advantages of quick temperature rise, uniform heating, high electric heating conversion efficiency and the like compared with the common electric heating tube under the same power.
The fan 33 in this embodiment adopts a cross-flow fan, the axial length of which is not limited, a fan impeller with a suitable length can be selected according to practical needs, and the air flow can reach a long distance due to the action of the two forces of the blades when the air flow passes through the fan impeller, and the cross-flow fan has the characteristics of uniform air outlet and no turbulence.
In order to avoid damage caused by overheat inside the fan heater of the cab, a fuse 5 can be connected in series in the control loop 2, the fuse is a temperature fuse, the fusing temperature is 121 ℃, and the fan heater can be effectively stopped under the condition of overheat inside the fan heater.
The heating loop 3 can also be correspondingly connected with the fuse 5 in series (the heating loop of the embodiment is not arranged), and the whole working process of the fan heater can be further ensured.
In order to further realize the temperature adjustment of the cab, the cab reaches a more constant temperature environment, and at least one temperature control switch 23 (two are arranged in the embodiment) is also connected in series in the control loop 2, wherein the control temperature of the temperature control switch is 80 ℃.
The two temperature control switches are arranged at the positions which are more dispersed and can be respectively arranged at the positions, close to the end parts, of the heating element in the length direction, one at the left end and the other at the right end, so that the temperature conditions of different corners in the case can be monitored in real time by the temperature control switch 23, once the overheat condition occurs, the corresponding temperature control switch is disconnected, so that a control loop is disconnected, the heating element stops heating, the whole environmental temperature in the cab is timely adjusted, and a reference is provided for the whole temperature uniformity condition in the air duct. Naturally, when the temperature value in the chassis is reduced to the recovery value of the temperature control switch (for example, the recovery value is 65 ℃ or 70 ℃), the temperature control switch can be automatically closed again to enable the heating loop to be turned on again for heating, so that the environmental temperature in the cab is quickly readjusted.
The control loop 2 is also provided with a delay relay coil 22 connected with the contactor coil in parallel, a delay relay contact 34 is connected in series in the fan branch, and the delay relay coil 22 and the delay relay contact 34 are an integral set of delay relay.
The delay relay ensures that when the control loop 2 is opened, the delay relay contact 34 is still in the suction state, and in this state, the fan 33 can still work normally to blow off the waste heat of the heating element 32 to the cab as much as possible, thereby ensuring the service life of the whole cab fan heater.
In the embodiment, the delay time of the delay relay is 30 seconds, the suction force of the cross-flow fan is large, the heat dissipation efficiency is high, and the waste heat in the heating element and the case can be completely dissipated outside the case within 30 seconds.
The circuit control of the cab fan heater of the embodiment is as follows: the control loop 2 is manually turned on, the temperature control switches are in a normally closed state, the contactor coil 21 starts to work and control the contactor contacts 31 to be attracted, so that each heating element 32 starts to generate heat, meanwhile, the delay relay coil 22 also starts to work and controls the delay relay contacts 34 to be attracted, the fan 33 is put into operation to absorb and blow hot air in the air duct 4 to a cab outside the case 1, in the process, the two temperature control switches 23 monitor the temperature of the corresponding positions in real time, once the temperature monitored by any one temperature control switch reaches the temperature control value of the temperature control switch, the temperature control switch 23 is turned off, so that the control loop is turned off, the heating element 32 stops heating, the temperature in the case enters a slow cooling process, and the overall heating temperature in the case 1 is adjusted.
With the decrease of the temperature in the case, when the temperature control switch 23 detects that the corresponding temperature reaches the temperature control value of the lower temperature, the temperature control switch is automatically closed again, and when both the temperature control switches 23 are in the closed state, the heating loop is automatically connected again, the heating element 32 is connected for heating, so that the temperature in the case starts to rise again.
When the fan heater of the cab needs to be turned off, the control loop 2 is manually turned off, at the moment, the contactor contacts 31 are turned off, all the heating elements 32 stop working, the delay relay contacts 34 are turned off after 30 seconds, and in the 30 seconds, the fan 33 is still in an air suction and air outlet working state, so that waste heat in the machine case 1 can be rapidly dissipated to the outside of the machine case.
The fuse 5 provides circuit safety for the control loop 2.
The cab warm air blower has the characteristics of high electric heat conversion efficiency, fast temperature rise, strong heat sensation, no open fire, no light consumption, safety, reliability and the like, can be installed on various vehicle types, is particularly suitable for being installed on a power centralized train, is installed in a cab rear wall side cabinet, does not occupy a large amount of cab space, is concise and attractive, and can provide a proper heating environment for a cab.
It is apparent that the above examples are only examples for clearly illustrating the technical solution of the present invention, and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (8)
1. The temperature control method of the warm air blower of the cab is characterized in that the warm air blower comprises a machine case, a warm air blower circuit is arranged in the machine case, an air channel is formed in a space around a heating element, the fan is arranged above or below the heating element, the machine case wall of the machine case at the position where the heating element and the fan are arranged is in a grid ventilation structure, the warm air blower circuit comprises a control loop and a heating loop, the control loop comprises a contactor coil and two temperature control switches, the two temperature control switches are respectively arranged at the position, close to the end part, of the heating element in the length direction, the heating loop comprises a heating branch and a fan branch which are connected in parallel, the heating branch comprises a contactor contact and a heating element connected in series with the contactor contact, and the fan branch comprises a fan for radiating heat generated by the heating element to the outside of the machine case; the temperature control method comprises the following steps:
S1: the control loop is manually connected, the temperature control switch is in a normally closed state, the contactor coil starts to work and controls the contactor contacts to be attracted, so that each heating element starts to generate heat, meanwhile, the delay relay coil also starts to work and controls the delay relay contacts to be attracted, so that the fan is put into operation to absorb and blow hot air in the air duct into a cab outside the case, and in the process, the two temperature control switches monitor the temperature of the corresponding position in real time; once the temperature monitored by any one temperature control switch reaches the temperature control value of the temperature control switch, the temperature control switch is turned off, so that the control loop is turned off, and then the heating loop is turned off, the heating element stops heating, and the temperature in the case enters a slow cooling process, so that the overall heating temperature in the case is adjusted;
S2: when the temperature control switches detect that the corresponding temperature reaches a temperature control value with lower temperature, the temperature control switches are automatically closed again, and when the two temperature control switches are in a closed state, the heating loop is automatically connected again, the heating element is connected for heating, so that the temperature in the case starts to rise again;
S3: when the fan heater of the cab needs to be closed, the control loop is manually disconnected, at the moment, the contactor contacts are disconnected, all heating elements stop working, the delay relay contacts are disconnected after a delay time, and in the second, the fan is still in an air suction and air outlet working state, so that waste heat in the machine case can be rapidly dissipated to the outside of the machine case.
2. The method of claim 1, wherein the heating branch has a plurality of heating elements connected in parallel.
3. The method of claim 1, wherein the heating element is a fin type electric heating tube.
4. The method of claim 1, wherein the fan is a cross-flow fan.
5. The method of claim 1, wherein a fusible link is connected in series in the control loop.
6. The method of claim 5, wherein the fuse wire has a fusing temperature of 121 ℃.
7. The method of claim 1, wherein the temperature control switch is controlled at 80 ℃.
8. The temperature control method of a cab fan heater according to claim 1, wherein a delay relay coil connected with the contactor coil in parallel is further arranged in the control loop, delay relay contacts are connected in series in the fan branch, and the delay time of the delay relay is 30 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810359534.1A CN108423022B (en) | 2018-04-20 | 2018-04-20 | Warm-air drier circuit and driver's cabin electric fan heater thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810359534.1A CN108423022B (en) | 2018-04-20 | 2018-04-20 | Warm-air drier circuit and driver's cabin electric fan heater thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108423022A CN108423022A (en) | 2018-08-21 |
| CN108423022B true CN108423022B (en) | 2024-05-28 |
Family
ID=63161516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810359534.1A Active CN108423022B (en) | 2018-04-20 | 2018-04-20 | Warm-air drier circuit and driver's cabin electric fan heater thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108423022B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109305181B (en) * | 2018-08-31 | 2024-05-28 | 株洲联诚集团控股股份有限公司 | Urban rail cab ventilation unit, change-over switch for ventilation unit and circuit thereof |
| CN111284329A (en) * | 2020-03-27 | 2020-06-16 | 湖南联诚轨道装备有限公司 | Electric pantograph lifting control device for urban rail |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2679549Y (en) * | 2003-12-29 | 2005-02-16 | 谢成昆 | Warming air heater for side wall of locomotive driver's cab |
| CN201932172U (en) * | 2011-01-17 | 2011-08-17 | 株洲联诚集团有限责任公司 | Hot air heater for heating in locomotive cab |
| CN202175059U (en) * | 2011-07-04 | 2012-03-28 | 长沙黄达铁路机车车辆配件有限公司 | Fan heater for locomotive cab |
| CN203372245U (en) * | 2013-06-27 | 2014-01-01 | 南车青岛四方机车车辆股份有限公司 | Fan heater of railway vehicle cab |
| CN203472867U (en) * | 2013-07-31 | 2014-03-12 | 湖南广欣科技发展有限公司 | Side wall warm air blower in locomotive driver's cab |
| CN204462705U (en) * | 2015-04-01 | 2015-07-08 | 朱芳 | A kind of indoor heater control circuit |
| CN104828104A (en) * | 2015-05-13 | 2015-08-12 | 镇江东方电热科技股份有限公司 | Foot heater for train cab |
| JP2015183953A (en) * | 2014-03-25 | 2015-10-22 | 三機工業株式会社 | Small-sized air conditioner and personal air conditioning system using the same |
| CN105216814A (en) * | 2015-10-14 | 2016-01-06 | 南车青岛四方机车车辆股份有限公司 | A kind of heater unit for guideway vehicle |
| CN205768498U (en) * | 2016-07-20 | 2016-12-07 | 郑州科林车用空调有限公司 | A kind of novel high-pressure electric heating wind electric system |
| CN208216717U (en) * | 2018-04-20 | 2018-12-11 | 株洲联诚集团控股股份有限公司 | Warm-air drier circuit and its drivers' cab warm-air drier |
-
2018
- 2018-04-20 CN CN201810359534.1A patent/CN108423022B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2679549Y (en) * | 2003-12-29 | 2005-02-16 | 谢成昆 | Warming air heater for side wall of locomotive driver's cab |
| CN201932172U (en) * | 2011-01-17 | 2011-08-17 | 株洲联诚集团有限责任公司 | Hot air heater for heating in locomotive cab |
| CN202175059U (en) * | 2011-07-04 | 2012-03-28 | 长沙黄达铁路机车车辆配件有限公司 | Fan heater for locomotive cab |
| CN203372245U (en) * | 2013-06-27 | 2014-01-01 | 南车青岛四方机车车辆股份有限公司 | Fan heater of railway vehicle cab |
| CN203472867U (en) * | 2013-07-31 | 2014-03-12 | 湖南广欣科技发展有限公司 | Side wall warm air blower in locomotive driver's cab |
| JP2015183953A (en) * | 2014-03-25 | 2015-10-22 | 三機工業株式会社 | Small-sized air conditioner and personal air conditioning system using the same |
| CN204462705U (en) * | 2015-04-01 | 2015-07-08 | 朱芳 | A kind of indoor heater control circuit |
| CN104828104A (en) * | 2015-05-13 | 2015-08-12 | 镇江东方电热科技股份有限公司 | Foot heater for train cab |
| CN105216814A (en) * | 2015-10-14 | 2016-01-06 | 南车青岛四方机车车辆股份有限公司 | A kind of heater unit for guideway vehicle |
| CN205768498U (en) * | 2016-07-20 | 2016-12-07 | 郑州科林车用空调有限公司 | A kind of novel high-pressure electric heating wind electric system |
| CN208216717U (en) * | 2018-04-20 | 2018-12-11 | 株洲联诚集团控股股份有限公司 | Warm-air drier circuit and its drivers' cab warm-air drier |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108423022A (en) | 2018-08-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108423022B (en) | Warm-air drier circuit and driver's cabin electric fan heater thereof | |
| CN201697275U (en) | Auxiliary electric heating protector of air conditioner | |
| CN205022545U (en) | On -vehicle electrical heating defogging defroster and have its vehicle | |
| CN105216814A (en) | A kind of heater unit for guideway vehicle | |
| CN208216717U (en) | Warm-air drier circuit and its drivers' cab warm-air drier | |
| CN202574236U (en) | Air heaters for locomotive cab | |
| CN205098205U (en) | A electric fan heater for rail vehicle | |
| CN206734261U (en) | The energy-saving high-tension electricity frost removal of pure electric coach | |
| CN201129854Y (en) | Hot air heating machine | |
| CN109572733B (en) | Forced ventilation electric heater, railway vehicle and control method of electric heater | |
| CN202813755U (en) | Temperature control heater | |
| CN211739256U (en) | Forced ventilation electric warmer | |
| CN209142131U (en) | A kind of urban rail drivers' cab ventilation unit and its ventilation unit change-over switch and circuit | |
| CN211808917U (en) | PTC multiple over-temperature protection system of electric automobile | |
| CN208264254U (en) | A kind of Medical foot-warming apparatus and its circuit used for city rail vehicle drivers' cab | |
| CN211017945U (en) | 10KV heavy current switch cabinet | |
| CN106218358A (en) | A kind of hybrid warm-air drier of automobile-used water power and operational approach thereof | |
| CN110894975A (en) | Forced ventilation electric warmer | |
| CN2831208Y (en) | Temp regulation ventilator for computer displaying panel | |
| KR20170129375A (en) | distributing board box with heating and cooling devices | |
| CN206870814U (en) | Drivers' cab leg static electric heater | |
| CN207594979U (en) | A kind of forced ventilation formula electricity heating installation | |
| CN108357508A (en) | A kind of Medical foot-warming apparatus and its circuit used for city rail vehicle drivers' cab | |
| CN109305181B (en) | Urban rail cab ventilation unit, change-over switch for ventilation unit and circuit thereof | |
| CN208264253U (en) | A kind of emu vehicle passenger compartment space heater |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |