CN114790643A - Heat pump type drum clothes dryer - Google Patents
Heat pump type drum clothes dryer Download PDFInfo
- Publication number
- CN114790643A CN114790643A CN202210307927.4A CN202210307927A CN114790643A CN 114790643 A CN114790643 A CN 114790643A CN 202210307927 A CN202210307927 A CN 202210307927A CN 114790643 A CN114790643 A CN 114790643A
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- Prior art keywords
- temperature
- evaporator
- refrigeration system
- drum
- dew point
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F58/00—Domestic laundry dryers
- D06F58/02—Domestic laundry dryers having dryer drums rotating about a horizontal axis
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F58/00—Domestic laundry dryers
- D06F58/32—Control of operations performed in domestic laundry dryers
- D06F58/34—Control of operations performed in domestic laundry dryers characterised by the purpose or target of the control
- D06F58/36—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry
- D06F58/38—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry of drying, e.g. to achieve the target humidity
- D06F58/40—Control of the initial heating of the drying chamber to its operating temperature
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/28—Air properties
- D06F2103/32—Temperature
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/58—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers related to condensation, e.g. condensate water level
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
- D06F2105/28—Electric heating
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
- D06F2105/30—Blowers
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Drying Of Solid Materials (AREA)
Abstract
A heat pump tumble dryer comprising: a compression refrigeration system; a drum for accommodating the laundry to be dried; a mechanical system driving the drum in rotation; a ventilation system for driving air to circulate through the evaporator, condenser and drum cavity of the refrigeration system; a detection device for detecting the circulation temperature; a controller including control of the refrigeration system; the circulation is also provided with an electric heating device, and the controller enables the electric heating device to operate when the clothes dryer is started and stops when the circulation temperature reaches a specified value. The electric heating device operates and supplements heat after the clothes dryer is started to accelerate the temperature rise of the system, shorten the time for cold wet clothes to reach the operating temperature suitable for drying, particularly enable the refrigerating system to be separated from the poor working condition as early as possible, and therefore improve the efficiency and facilitate the safety of the compressor.
Description
Technical Field
The invention relates to a heat pump type drum dryer, and belongs to the IPC classes D06F 58/10 and D06F 58/24.
Background
Compared with a direct-exhaust type and condensation type drum clothes dryer, the traditional heat pump type drum clothes dryer has the advantages that energy is saved remarkably, however, rated operation input power is reduced remarkably, heat generation power is small, the time for heating cold-state wet clothes to a proper temperature after starting is long, at the moment, the operation of a clothes dryer refrigerating system deviates from a good working condition, and efficiency and equipment are influenced.
With regard to terms and general knowledge, reference may be made to the national standard GB/T23118-2008 domestic and similar purpose drum-type washing and drying machine, the national industry standard QB/T4685-2014 domestic and similar purpose heat pump drying machine, and the mechanical industry Press 1978-1983, 1 st edition or 1997, 2 nd edition, the Motor engineering Manual and the mechanical engineering Manual, unless otherwise specified in this specification.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: a heat pump type drum clothes dryer is provided, which can improve the problem of the prior art in the initial operation stage of the traditional design.
The technical scheme for solving the technical problem is as follows: a heat pump tumble dryer comprising:
-a compression refrigeration system;
-a drum for containing the laundry to be dried;
-a mechanical system driving the drum in rotation;
-a ventilation system to drive air circulation through the evaporator, condenser and drum chamber of the refrigeration system;
-a detection device comprising detection of said cycling temperature;
-a controller comprising controlling the refrigeration system;
the method is characterized in that: the circulation is also provided with an electric heating device, and the controller enables the electric heating device to operate when the clothes dryer is started and stops when the temperature reaches a 1 st specified value.
The electric heating device supplements heat after the clothes dryer is started to accelerate the temperature rise of the system, shortens the time for cold wet clothes to reach the suitable drying operation temperature, particularly enables the refrigerating system to be separated from the poor working condition as soon as possible, and can improve the efficiency and the equipment safety.
The best position for the electric heating device is between the circulating evaporator and the condenser.
If the temperature of the system is accelerated only for supplementing heat, the electric heating device can be arranged at any position of the cycle; and is located between the condenser and the drum cavity of the closed-loop cycle in a conventional sense, which is most advantageous for directly heating the laundry in the drum and reducing the load of the condenser using the heat supplemented by the electric heating device. In fact, this is only the case when the electric heating device is required to supplement heat after the dryer is stably operated. The technical scheme has the ingenious points that: the condenser is in a low-temperature, namely low-load unfavorable working condition in the initial stage after starting, and at the moment, the condenser is heated, so that the problem of safety is completely solved, and the condenser is more favorable for increasing the temperature as soon as possible due to the increase of the load so as to enter the optimal working condition. This technical scheme makes the electric heat equipment start-up move extremely at the dryer the temperature stops when reaching the specified value promptly, avoids continuing to heat promptly to lead to deviating from optimum operating mode and increase load in efficiency and equipment safety unfavorable, makes the electric heat equipment set up before the condenser this moment, can make the condenser be in optimum operating mode sooner and more accurately, just closed loop circulation makes also all entering cylinders behind the condenser of the heat that this electric heat equipment supplyed, and the loss is few, can not influence efficiency.
The optimal location for the cyclic temperature detection is the condenser surface.
The optimum value of the temperature regulation value is 27 ℃.
In order to ensure the safety of the compressor of the refrigerating system, the refrigerating system is further designed to be started to operate at the temperature of more than 25 ℃.
The detection device is further designed to detect the surface temperature of the evaporator of the refrigeration system and the dew point temperature of the air entering the surface of the evaporator, and the controller controls the refrigeration system or/and the ventilation system according to the two temperature detection results, so that the surface temperature of the evaporator is lower than the dew point temperature, and the temperature difference is not less than a 2 nd specified value.
Compared with the traditional control, the design can more accurately and stably lead the surface of the evaporator of the refrigerating system to be in the condensation state for effectively dehumidifying, thereby avoiding the ineffective or inefficient operation of the clothes dryer, leading the drying time to be shorter and reducing the energy consumption.
The typical design is as follows: the describedThe detection device is provided with a temperature sensor on the surface of the evaporator and an inlet for detecting the temperature T of the air dry bulb at the position Q And relative humidity phi Q The controller is in accordance with the dry bulb temperature T Q And relative humidity phi Q Calculating the air dew point temperature T according to the detection result L Detecting and recording the surface temperature T of the evaporator at the moment Z And then controlling the refrigeration system to work according to the following modes:
a) once the evaporator surface temperature T Z Below the dew point temperature T L Temperature difference delta of TL Stopping the operation of the refrigeration system when the temperature is less than a predetermined value, and when the surface temperature T of the evaporator is lower than the predetermined value Z Below the dew point temperature T L Temperature difference delta of TL When the temperature is not less than the specified value, the refrigeration system resumes operation; or alternatively
b) Causing said refrigeration system to operate such that the evaporator surface temperature is greater than said recorded evaporator surface temperature T Z Reducing the operation of a specified value; or
c) Starting the electric heating device, and simultaneously stopping the refrigeration system from running when the surface temperature T of the evaporator is Z Below the dew point temperature T L Temperature difference delta of TL And when the temperature is not less than the specified value, the refrigerating system resumes operation and stops the operation of the electric heating device.
The 2 nd prescribed value is preferably designed to be 2 to 5K.
According to the temperature T of the air dry bulb Q And relative humidity phi Q The formula for calculating the dew point temperature of the air according to the detection result is as follows:
T L ＝273(7.5T Q /(T Q +273)+L n φ Q /2.3-2.0)/(7.5T q /(T Q +273)+L n φ Q /2.3+5.5)
the solution of the invention and its typical design will be further explained in the detailed description.
Drawings
The following drawings are included to illustrate specific embodiments of the invention.
FIG. 1 is a block diagram of a heat pump tumble dryer system according to an embodiment of the present invention;
FIG. 2 is a flowchart of a heat pump tumble dryer 1 control according to an embodiment of the present invention;
FIG. 3 is a flow chart of the heat pump tumble dryer control 2 according to an embodiment of the present invention;
fig. 4 is a flowchart of a heat pump tumble dryer 3 rd control according to the embodiment of the present invention.
Detailed Description
The basic system structure of the heat pump type drum clothes dryer of the embodiment of the invention is shown as figure 1:
at point 1, heated dry air enters main blower 12;
at point 2, air leaves the main fan 12 into the rotating drum 10, drawing moisture from the tumbling clothes;
at point 3, the drawn water leaves the drum 10, carried along, to the filter 14
At point 4, the air after passing through the filter 14 enters the evaporator 18, the evaporator 18 cools the air below its dew point, and moisture previously extracted from the laundry condenses out of the air, is collected by the drip tray 20 and flows to the catch tank 22. An automatic pump 24 pumps water from the collection tank 22 to an external drain fitting. The pump 24 may be controlled by any suitable method, such as a float switch or an electronic level sensor within the collection tank 22. The evaporator 18 extracts sufficient enthalpy, as well as the heat of condensation of the water removed from the clothes, to lower the temperature of the air below the dew point. Thus, the required cooling capacity of the evaporator 18 is equal to the sum of the enthalpy and the heat of condensation;
at point 6, the condensed dehumidified air exits the evaporator 18, cools and is effectively saturated (nominal RH 85% -90%), and then enters the air electric heater 34. The electric heater 34 is a simple air-to-air heat exchanger that conducts electric heat to the air from the evaporator 18. Air passes out of the air electric heater 34 into the condenser 26. The condenser 26 further heats the air to the initial temperature at point 1, then exits the condenser 26 and enters the drum 10 again at point 1, completing the closed loop cycle. The heating capacity of the condenser 26 is equal to the evaporator 18 cooling capacity plus the power consumption of the heat pump compressor 16. The additional heat, equal to the power consumption of the compressor 16, added to the circulating air by the condenser 26, acts in the drum 10, gradually increasing the moisture extraction rate. This heat is then removed by the air electric heater 34, maintaining the thermal balance of the system.
The system heat pump acts as a dehumidifier and the refrigerant exits the compressor 16 as a high pressure vapor and flows to the condenser 26 at point 1' where the heat of condensation is transferred to the circulating air. The refrigerant condenses and exits the condenser 26 at point 2' as a high pressure liquid and flows through the receiver 28 to the throttle capillary tube 30, which reduces the pressure of the refrigerant by the capillary tube 30. The refrigerant exits the capillary tube 30 at point 5' as a low pressure, low mass liquid/vapor mixture and enters the evaporator. The evaporator 18 extracts the heat of vaporization of the refrigerant from the circulating air and boils the refrigerant to a gaseous state. The slightly superheated vapor exits the evaporator 18 at point 7' and reenters the compressor 16, completing the cycle.
The system is provided with the following sensors:
-setting the temperature T of the dry bulb in the space of the inlet of the circulating air of the evaporator Q And relative humidity phi Q The sensor 181 of (a);
-providing a detection surface temperature T on the evaporator surface Z The sensor 182 of (a);
a sensor 261 for detecting the air temperature is arranged close to the condenser surface;
the controller 32 has a number of control functions, such as cycle time and drying control. The controller 32 may be a control and monitoring system implemented by a microcontroller, a microcomputer, or the like. The controller 32 may receive input from sensors and user input/output devices. The controller 32 may be coupled to the various components via input and/or control lines (shown or not shown in fig. 1) for receiving sensor signals and/or controlling the operation thereof. The sensors input by the controller 32 include the above-described sensors 181, 182 and 261, as well as temperature sensors positioned at different locations along the air supply flow path and the refrigerant flow path, moisture sensors positioned at different locations along the air supply path, and the like.
The controller 32 performs control by a software program stored in a microcontroller, a microcomputer, or the like, according to the detection result of the sensor, the software program having the flow shown in fig. 2, 3, or 4.
As in the control flow of FIG. 2, temperature sensor 261 senses the temperature T of the circulating air passing over the condenser surface N The 1 st set point for this temperature control in the controller 32 is 25 ℃, the 2 nd set point is 27 ℃, and the controls are:
when T is N When the temperature is lower than 25 ℃, the electric heater 34 is electrified, and the compressor 16 is forbidden to operate;
when T is N When the temperature is higher than 25 ℃ and lower than 27 ℃, the electric heater 34 is electrified, and the compressor 16 operates;
when T is N When the temperature is higher than 27 ℃, the electric heater 34 is powered off, and the compressor 16 operates.
As shown in the control flow of FIG. 3, the sensor 181 detects the dry bulb temperature T at the inlet of the circulating air of the evaporator Q And relative humidity phi Q And substituting the detection result into the following formula to calculate to obtain the dew point temperature of the air at the moment:
T L ＝273(7.5T Q /(T Q +273)+L n φ Q /2.3-2.0)/(7.5T q /(T Q +273)+L n φ Q /2.3+5.5)；
Comparison T L —T Z Calculating the temperature difference delta LZ ＝T L —T Z
when delta LZ When the temperature is more than or equal to 3K, the compressor 16 is started to operate, and the electric heater 34 is powered off; when delta LZ <At 3K, the compressor 16 is stopped or the electric heater 34 is energized.
As in the control flow of FIG. 4, the capillary 30 of FIG. 1 is now controlled insteadThe control flow of the expansion valve controlled by the controller 32 is a modification of the control flow of fig. 3, mainly where the controller 32 is delta LZ The control of (2) is changed into:
when delta LZ When the temperature is more than or equal to 3K, the compressor 16 is started to operate, and the electric heater 34 is powered off; when delta LZ <At 3K, the compressor 16 continues to run, but the controller 32 controls the expansion valve to cause the system to implement an evaporator surface temperature that is greater than the currently recorded evaporator surface temperature T Z The operation is reduced by 1-3K.
The use of an expansion valve controlled by the controller 32 facilitates control of refrigerant mass flow by proportionally opening and closing in response to system conditions, and in one embodiment maintains a constant low superheat to maximize evaporator capacity while preventing liquid from entering the compressor.
Claims (8)
1. A heat pump tumble dryer comprising:
-a compression refrigeration system;
-a drum for containing the laundry to be dried;
-a mechanical system driving the drum in rotation;
-a ventilation system to drive air circulation across the evaporator, condenser and drum cavity of the refrigeration system;
-a detection device comprising detecting the closed loop cycle temperature;
-a controller comprising controlling the refrigeration system;
the method is characterized in that: the circulation is also provided with an electric heating device, and the controller enables the electric heating device to operate when the clothes dryer is started and stops when the circulation temperature reaches a 1 st specified value.
2. The drum dryer according to claim 1, characterized in that: the circulating temperature detection position is the surface of the condenser.
3. The drum dryer according to claim 2, characterized in that: the 1 st prescribed value is 27 ℃.
4. The drum dryer according to claim 3, characterized in that: the refrigeration system is started to operate at the temperature of more than 25 ℃.
5. A tumble dryer according to any one of claims 1 to 4, characterized in that: the detection device detects the surface temperature of the evaporator of the refrigeration system and the dew point temperature of the air entering the surface of the evaporator, and the controller controls the refrigeration system or/and the ventilation system according to the two temperature detection results to ensure that the surface temperature of the evaporator is lower than the dew point temperature and the temperature difference is not less than a 2 nd specified value.
6. The tumble dryer according to claim 5, characterized in that: the detection device is provided with a temperature sensor on the surface of the evaporator and an inlet for detecting the temperature T of the air dry bulb at the position q And relative humidity phi Q The controller is in accordance with the dry bulb temperature T Q And relative humidity phi Q Calculating the dew point temperature T of the air according to the detection result L Detecting and recording the surface temperature T of the evaporator at the moment Z And then controlling the refrigeration system to work according to the following modes:
a) once the evaporator surface temperature T Z Below the dew point temperature T L Temperature difference delta of TL Stopping the operation of the refrigeration system when the temperature is less than a predetermined value, and stopping the operation of the refrigeration system when the surface temperature T of the evaporator is less than the predetermined value Z Below the dew point temperature T L Temperature difference delta of TL When the temperature is not less than the specified value, the refrigeration system resumes operation; or
b) Causing said refrigeration system to operate such that the evaporator surface temperature is greater than said recorded evaporator surface temperature T Z Reducing the operation of a specified value; or alternatively
c) Starting the electric heating device, and simultaneously stopping the refrigeration system from running when the surface temperature T of the evaporator is Z Below the dew point temperature T L Temperature difference delta of TL And when the temperature is not less than the specified value, the refrigerating system resumes operation and stops the electric heating device.
7. The tumble dryer according to claim 6, characterized in that: the 2 nd prescribed value is 2-5K.
8. The tumble dryer according to claim 6, characterized in that: according to the air dry bulb temperature T Q And relative humidity phi Q The formula for calculating the dew point temperature of the air according to the detection result is as follows:
T L ＝273(7.5T Q /(T Q +273)+L n φ Q /2.3-2.0)/(7.5T q /(T Q +273)+L n φ Q /2.3+5.5)。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210307927.4A CN114790643A (en) | 2022-03-25 | 2022-03-25 | Heat pump type drum clothes dryer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210307927.4A CN114790643A (en) | 2022-03-25 | 2022-03-25 | Heat pump type drum clothes dryer |
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| CN114790643A true CN114790643A (en) | 2022-07-26 |
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| CN202210307927.4A Pending CN114790643A (en) | 2022-03-25 | 2022-03-25 | Heat pump type drum clothes dryer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114775239A (en) * | 2022-03-25 | 2022-07-22 | 鹤山市嘉基尚电器实业有限公司 | Heat pump type drum clothes dryer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0498038A (en) * | 1990-08-10 | 1992-03-30 | Daikin Ind Ltd | Operation control device for air conditioner |
| US20050066538A1 (en) * | 2003-09-29 | 2005-03-31 | Michael Goldberg | Heat pump clothes dryer |
| KR20110029579A (en) * | 2009-09-16 | 2011-03-23 | 위니아만도 주식회사 | Drying machine of use heat pump and method of controlling the same |
| CN104631069A (en) * | 2013-11-07 | 2015-05-20 | 杭州三花研究院有限公司 | Clothes dryer and control method thereof |
| CN104790191A (en) * | 2015-04-20 | 2015-07-22 | 广东美的制冷设备有限公司 | Method and device for controlling dehumidifier and dehumidifier |
| CN111336646A (en) * | 2020-03-18 | 2020-06-26 | 宁波奥克斯电气股份有限公司 | Control method for dehumidification of air conditioner and air conditioner |
| CN111676675A (en) * | 2020-05-20 | 2020-09-18 | 青岛海尔滚筒洗衣机有限公司 | Heat pump clothes dryer and control method thereof |
| JP2021076342A (en) * | 2019-11-13 | 2021-05-20 | 三菱電機ビルテクノサービス株式会社 | Air conditioner |
| CN114775239A (en) * | 2022-03-25 | 2022-07-22 | 鹤山市嘉基尚电器实业有限公司 | Heat pump type drum clothes dryer |
-
2022
- 2022-03-25 CN CN202210307927.4A patent/CN114790643A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0498038A (en) * | 1990-08-10 | 1992-03-30 | Daikin Ind Ltd | Operation control device for air conditioner |
| US20050066538A1 (en) * | 2003-09-29 | 2005-03-31 | Michael Goldberg | Heat pump clothes dryer |
| KR20110029579A (en) * | 2009-09-16 | 2011-03-23 | 위니아만도 주식회사 | Drying machine of use heat pump and method of controlling the same |
| CN104631069A (en) * | 2013-11-07 | 2015-05-20 | 杭州三花研究院有限公司 | Clothes dryer and control method thereof |
| CN104790191A (en) * | 2015-04-20 | 2015-07-22 | 广东美的制冷设备有限公司 | Method and device for controlling dehumidifier and dehumidifier |
| JP2021076342A (en) * | 2019-11-13 | 2021-05-20 | 三菱電機ビルテクノサービス株式会社 | Air conditioner |
| CN111336646A (en) * | 2020-03-18 | 2020-06-26 | 宁波奥克斯电气股份有限公司 | Control method for dehumidification of air conditioner and air conditioner |
| CN111676675A (en) * | 2020-05-20 | 2020-09-18 | 青岛海尔滚筒洗衣机有限公司 | Heat pump clothes dryer and control method thereof |
| CN114775239A (en) * | 2022-03-25 | 2022-07-22 | 鹤山市嘉基尚电器实业有限公司 | Heat pump type drum clothes dryer |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114775239A (en) * | 2022-03-25 | 2022-07-22 | 鹤山市嘉基尚电器实业有限公司 | Heat pump type drum clothes dryer |
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