TWI381077B - Heat pump clothes dryer and controlling method for heat pump clothes dryer - Google Patents
Heat pump clothes dryer and controlling method for heat pump clothes dryer Download PDFInfo
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本發明是有關於一種乾衣機及乾衣機之控制方法，且特別是有關於一種熱泵乾衣機及熱泵乾衣機之控制方法。The present invention relates to a method of controlling a dryer and a dryer, and more particularly to a method of controlling a heat pump dryer and a heat pump dryer.
人們在洗滌衣物後，可以透過陽光及風力來晾乾衣物。然而，在下雨天時，往往無法順利晾乾衣物，造成人們生活上的困擾。After washing clothes, people can dry their clothes through the sun and the wind. However, when it is raining, it is often impossible to dry clothes and cause troubles in people's lives.
乾衣機的問世，使得人們在下雨天也能烘乾衣物，帶給人們相當大得便利性。然而傳統排熱式乾衣機直接將高溫高濕空氣直接排放至大氣中，不但能源使用效率偏低，而且造成環境濕度的增加。熱泵乾衣機不但以優異的性能表現係數(Coefficient of performance)達到節能的目的，而且有效捕捉空氣中的水分，使環境的濕度不致受到嚴重的影響。以日本公開號第2006-212265號專利為例，熱泵乾衣機的運作原理係透過氣體通道及冷媒通道的熱交換，來烘乾衣物。The advent of dryers has enabled people to dry their clothes on rainy days, giving people considerable convenience. However, the conventional exhaust-type dryer directly discharges high-temperature and high-humidity air directly into the atmosphere, which not only has low energy use efficiency, but also causes an increase in environmental humidity. The heat pump dryer not only achieves energy saving with excellent coefficient of performance, but also effectively captures moisture in the air so that the humidity of the environment is not seriously affected. Taking the Japanese Patent Publication No. 2006-212265 as an example, the operation principle of the heat pump dryer is to dry the clothes through heat exchange between the gas passage and the refrigerant passage.
一般而言，熱泵乾衣機根據架構區分，可分為開放式與封閉式。從PRASERTSAN等人所發表的文獻結果顯示，當乾燥效率(Dryer efficiency)較高時，開放式熱泵乾衣機的能源效率比封閉式熱乾衣機好；當乾燥效率較低時，封閉式熱泵乾衣機的能源效率比開放式熱乾衣機好。然而，對批次式裝載衣物的乾衣機而言，乾衣機的乾燥效率並不會保持一定，而是隨著乾燥程序的進行而逐漸下降。換言之，不管採用哪一個形式的熱泵乾衣機架構，都會有乾衣機效能較差的情形出現。因此，如何在乾衣後期增加熱泵乾衣機的能源使用效率，實為目前重要發展方向之一。In general, heat pump dryers are classified into open and closed types according to the structure. The literature published by PRASERTSAN et al. shows that when the Dryer efficiency is high, the energy efficiency of the open heat pump dryer is better than that of the closed heat dryer; when the drying efficiency is low, the closed heat pump Dryers are more energy efficient than open heat dryers. However, for a batch-type clothes dryer, the drying efficiency of the dryer does not remain constant, but gradually decreases as the drying process proceeds. In other words, no matter which form of heat pump dryer structure is used, there will be a situation where the dryer is inferior. Therefore, how to increase the energy efficiency of the heat pump dryer in the late stage of drying is one of the important development directions.
本發明係有關於一種熱泵乾衣機及熱泵乾衣機之控制方法，其利用開放式風道與封閉式風道的切換，大幅增進熱泵乾衣機的能源使用效率。The invention relates to a control method of a heat pump dryer and a heat pump dryer, which utilizes the switching of an open air duct and a closed air duct to greatly improve the energy use efficiency of the heat pump dryer.
根據本發明之一方面，提出一種熱泵乾衣機之控制方法。熱泵乾衣機之控制方法包括以下步驟。提供一乾燥腔體。乾燥腔體具有一入口及一出口。入口具有一入口絕對濕度(inlet humidity ratio)。出口具有一出口絕對濕度(outlet humidity ratio)及一出口飽和絕對濕度(outlet saturation humidity ratio)。控制由乾燥腔體離開之一氣體排出熱泵乾衣機之外。依據入口絕對濕度、出口絕對濕度及出口飽和絕對濕度，判斷乾燥腔體之運作是否符合一預定條件。若乾燥腔體之運作符合預定條件，則控制由乾燥腔體離開之氣體回流至乾燥腔體。According to an aspect of the invention, a method of controlling a heat pump dryer is proposed. The control method of the heat pump dryer includes the following steps. A dry cavity is provided. The drying chamber has an inlet and an outlet. The inlet has an inlet humidity ratio. The outlet has an outlet humidity ratio and an outlet saturation humidity ratio. Control is removed from the drying chamber by a gas exiting the heat pump dryer. According to the absolute humidity of the inlet, the absolute humidity of the outlet and the absolute humidity of the outlet, it is judged whether the operation of the drying chamber conforms to a predetermined condition. If the operation of the drying chamber meets the predetermined conditions, the gas leaving the drying chamber is controlled to flow back to the drying chamber.
根據本發明之另一方面，提出一種熱泵乾衣機。熱泵乾衣機包括一乾燥腔體、一切換單元及一控制單元。乾燥腔體具有一入口及一出口。入口具有一入口絕對濕度(inlet humidity ratio)。出口具有一出口絕對濕度(outlet humidity ratio)及一出口飽和絕對濕度(outlet saturation humidity ratio)。第一切換單元用以切換由乾燥腔體離開之一氣體排出熱泵乾衣機之外或回流至乾燥腔體。控制單元依據入口絕對濕度、出口絕對濕度及出口飽和絕對濕度判斷乾燥腔體之運作是否符合一預定條件。其中，若乾燥腔體之運作未符合預定條件，則控制單元控制第一切換單元，使得由乾燥腔體離開之氣體排出熱泵乾衣機之外。若乾燥腔體之運作符合預定條件，則控制單元控制第一切換單元，使得由乾燥腔體離開之氣體回流至乾燥腔體。According to another aspect of the invention, a heat pump dryer is proposed. The heat pump dryer includes a drying chamber, a switching unit and a control unit. The drying chamber has an inlet and an outlet. The inlet has an inlet humidity ratio. The outlet has an outlet humidity ratio and an outlet saturation humidity ratio. The first switching unit is configured to switch from the drying chamber to leave a gas out of the heat pump dryer or back to the drying chamber. The control unit determines whether the operation of the drying chamber conforms to a predetermined condition according to the absolute humidity of the inlet, the absolute humidity of the outlet, and the absolute humidity of the outlet. Wherein, if the operation of the drying chamber does not meet the predetermined condition, the control unit controls the first switching unit such that the gas leaving the drying chamber exits the heat pump dryer. If the operation of the drying chamber meets the predetermined condition, the control unit controls the first switching unit such that the gas exiting the drying chamber is returned to the drying chamber.
為讓本發明之上述內容能更明顯易懂，下文特舉實施例，並配合所附圖式，作詳細說明如下：In order to make the above-mentioned contents of the present invention more comprehensible, the following specific embodiments, together with the drawings, are described in detail below:
以下係提出實施例進行詳細說明，實施例僅用以作為範例說明，並不會限縮本發明欲保護之範圍。此外，實施例中之圖式係省略不必要之元件，以清楚顯示本發明之技術特點。The following is a detailed description of the embodiments, which are intended to be illustrative only and not to limit the scope of the invention. In addition, the drawings in the embodiments omit unnecessary elements to clearly show the technical features of the present invention.
請參照第1圖，其繪示第一實施例之熱泵乾衣機1000之示意圖。本實施例之熱泵乾衣機1000包括一供氣單元110、一排氣單元150、一乾燥腔體120、一循環風扇130、一切換單元140、一控制單元210、一壓縮單元310、一冷凝單元320、一膨脹單元330、一蒸發單元340、一第一量測單元410、一第二量測單元420及一第三量測單元430。一氣體通道P1連接供氣單元110、第一量測單元410、乾燥腔體120、第二量測單元420、循環風扇130、切換單元140及排氣單元150。一冷媒通道P2連接壓縮單元310、冷凝單元320、第三量測單元430、膨脹單元330及蒸發單元340。Please refer to FIG. 1 , which is a schematic diagram of the heat pump dryer 1000 of the first embodiment. The heat pump dryer 1000 of the present embodiment includes a gas supply unit 110, an exhaust unit 150, a drying chamber 120, a circulation fan 130, a switching unit 140, a control unit 210, a compression unit 310, and a condensation unit. The unit 320, an expansion unit 330, an evaporation unit 340, a first measurement unit 410, a second measurement unit 420, and a third measurement unit 430. A gas passage P1 connects the gas supply unit 110, the first measurement unit 410, the drying chamber 120, the second measurement unit 420, the circulation fan 130, the switching unit 140, and the exhaust unit 150. A refrigerant passage P2 is connected to the compression unit 310, the condensing unit 320, the third measuring unit 430, the expansion unit 330, and the evaporation unit 340.
供氣單元110用以提供一氣體進入熱泵乾衣機1000。排氣單元150用以將氣體排出於熱泵乾衣機1000之外。乾燥腔體120用以容置衣物，以進行乾燥。乾燥腔體120例如是水平滾筒式腔體、斜取滾筒式腔體或直立式腔體。切換單元140係為一三通風門，用以切換氣體在氣體通道P1內的流向。循環風扇130用以增進氣體於氣體通道P1內的流通性。控制單元210用以進行各種運算程序及判斷程序，並用以控制熱泵乾衣機1000之各項元件的運作。The gas supply unit 110 is used to supply a gas into the heat pump dryer 1000. The exhaust unit 150 is for exhausting gas outside the heat pump dryer 1000. The drying chamber 120 is for accommodating clothes for drying. The drying chamber 120 is, for example, a horizontal drum chamber, a truncated drum chamber or an upright chamber. The switching unit 140 is a three-way venting door for switching the flow direction of the gas in the gas passage P1. The circulation fan 130 serves to increase the fluidity of the gas in the gas passage P1. The control unit 210 is configured to perform various arithmetic programs and determination programs, and is used to control the operation of various components of the heat pump dryer 1000.
壓縮單元310用以壓縮一冷媒。冷凝單元320用以冷凝已壓縮之冷媒。膨脹單元330用以減壓已冷凝之冷媒。蒸發單元340用以蒸發已減壓之冷媒。The compression unit 310 is used to compress a refrigerant. The condensing unit 320 is used to condense the compressed refrigerant. The expansion unit 330 is for decompressing the condensed refrigerant. The evaporation unit 340 is used to evaporate the decompressed refrigerant.
第一量測單元410設置於乾燥腔體120之一入口120a處，第二量測單元420設置於乾燥腔體120之一出口120b處。第三量測單元430則設置於冷凝單元320及膨脹單元330之間。第一～第三量測單元410～430用以針對氣體或冷媒進行各種數值之量測。The first measuring unit 410 is disposed at one of the inlets 120a of the drying chamber 120, and the second measuring unit 420 is disposed at one of the outlets 120b of the drying chamber 120. The third measuring unit 430 is disposed between the condensing unit 320 and the expansion unit 330. The first to third measuring units 410 to 430 are used to measure various values for the gas or the refrigerant.
就熱泵乾衣機1000之乾燥方式而言，外界之乾燥氣體進入氣體通道P1後，在冷凝單元320進行熱交換，而形成高溫乾燥氣體。此高溫乾燥氣體由入口120a進入乾燥腔體120後，可帶走衣物的水氣，並由出口120b輸出高溫潮濕氣體。In the drying mode of the heat pump dryer 1000, after the outside drying gas enters the gas passage P1, heat exchange is performed at the condensing unit 320 to form a high-temperature drying gas. After the high temperature drying gas enters the drying chamber 120 from the inlet 120a, the moisture of the laundry can be taken away, and the high temperature humid gas is output from the outlet 120b.
為了避免高溫潮濕氣體造成外界的熱污染，由乾燥腔體120排出之高溫潮濕氣體可以在蒸發單元340進行熱交換，而吸收部份熱量及冷凝部份水氣。In order to avoid external heat pollution caused by the high temperature humid gas, the high temperature humid gas discharged from the drying chamber 120 may be heat exchanged in the evaporation unit 340 to absorb part of the heat and condense part of the water vapor.
當切換單元140將氣體通道P1切換成流向D1時，氣體通道P1形成一開放式風道。當切換單元140將氣體通道P1切換成流向D2時，氣體通道P1形成一封閉式風道。When the switching unit 140 switches the gas passage P1 to the flow direction D1, the gas passage P1 forms an open duct. When the switching unit 140 switches the gas passage P1 to the flow direction D2, the gas passage P1 forms a closed air passage.
在熱泵乾衣機1000剛開始運作時，乾燥腔體120內外潮濕程度差異大，水氣濃度梯度較大，此時可以採用開放式風道，以利用外界較乾燥的氣體來帶走乾燥腔體120內的水氣。When the heat pump dryer 1000 is just beginning to operate, the humidity inside and outside of the drying chamber 120 is greatly different, and the water vapor concentration gradient is large. At this time, an open air passage can be used to take away the drying chamber by using a relatively dry gas outside. Water vapor in 120.
在熱泵乾衣機1000運作一段時間後，乾燥腔體120內外潮濕程度差異不大，此時可以採用封閉式風道，以使內部已增溫之氣體回流至乾燥腔體120，不直接排放至外界環境之中，以減少能源的浪費。After the heat pump dryer 1000 is operated for a period of time, the degree of moisture inside and outside the drying chamber 120 is not much different. At this time, a closed air passage can be used to return the internally heated gas to the drying chamber 120 without directly discharging to In the external environment to reduce energy waste.
控制單元210所進行之控制程序及判斷程序與「絕對濕度(humidity ratio)」、「飽和絕對濕度(saturation humidity ratio)」或「相對濕度(relative humidity)」有關。絕對濕度係為含水氣體之水質量與氣體質量的比值。飽和絕對濕度為含水氣體在飽和狀態之絕對濕度。相對濕度則為絕對濕度與飽和絕對濕度之比值。絕對濕度及相對濕度隨著含水程度不同而改變。飽和濕度在某一溫度及某一壓力下，則為固定值。The control program and the determination program performed by the control unit 210 are related to "humidity ratio", "saturation humidity ratio" or "relative humidity". Absolute humidity is the ratio of the water quality of the aqueous gas to the mass of the gas. The saturated absolute humidity is the absolute humidity of the aqueous gas in saturation. Relative humidity is the ratio of absolute humidity to saturated absolute humidity. Absolute humidity and relative humidity vary with the degree of water content. The saturated humidity is a fixed value at a certain temperature and a certain pressure.
控制單元210依據絕對濕度、飽和濕度或相對濕度等資訊可以判斷出何時最適合由開放式風道切換為封閉式風道。請參照第2圖，其繪示乾燥效率ηdryer 與乾燥速率MER之關係圖。乾燥效率ηdryer 等於出口絕對濕度ω out 減去入口絕對濕度ω in 之差值除以出口飽和絕對濕度ω sat , out 減去入口絕對濕度ω in 之差值，即以下第(1)式The control unit 210 can determine when it is most suitable to switch from an open air duct to a closed air duct based on information such as absolute humidity, saturated humidity, or relative humidity. Please refer to FIG. 2, which is a graph showing the relationship between the drying efficiency η dryer and the drying rate MER. The drying efficiency η dryer is equal to the difference between the outlet absolute humidity ω out minus the inlet absolute humidity ω in divided by the outlet saturated absolute humidity ω sat , out minus the inlet absolute humidity ω in , ie the following equation (1)
簡單來說，相同條件下，出口絕對濕度ω out 與入口絕對濕度ω in 差距越大時，乾燥效率ηdryer 越大。反之，相同條件下，出口絕對濕度ω out 與入口絕對濕度ω in 差距越小時，乾燥效率ηdryer 越小。熱泵乾衣機1000剛開始運轉時，出口絕對濕度ω out 與入口絕對濕度ω in 差距通常較大。隨著乾燥腔體120內的衣物越來越乾燥時，出口絕對濕度ω out 與入口絕對濕度ω in 差距也會越來越小。所以，隨著熱泵乾衣機1000的運轉，乾燥效率ηdryer 將會逐漸降低。In short, under the same conditions, when the difference between the outlet absolute humidity ω out and the inlet absolute humidity ω in is larger, the drying efficiency η dryer is larger. On the contrary, under the same conditions, the smaller the difference between the outlet absolute humidity ω out and the inlet absolute humidity ω in , the smaller the drying efficiency η dryer . When the heat pump dryer 1000 is initially in operation, the difference between the outlet absolute humidity ω out and the inlet absolute humidity ω in is usually large. As the laundry in the drying chamber 120 becomes more and more dry, the difference between the outlet absolute humidity ω out and the inlet absolute humidity ω in will become smaller and smaller. Therefore, as the heat pump dryer 1000 operates, the drying efficiency η dryer will gradually decrease.
乾燥速率MER係為乾燥腔體120係為每小時所提出之水質量。承上所述，隨著熱泵乾衣機1000的運轉，乾燥效率ηdryer 將會逐漸降低。如第2圖所示，乾燥效率ηdryer 逐漸降低時，乾燥速率MER也隨之降低。The drying rate MER is the water quality of the drying chamber 120 which is proposed per hour. As described above, as the heat pump dryer 1000 operates, the drying efficiency η dryer will gradually decrease. As shown in Fig. 2, when the drying efficiency η dryer is gradually lowered, the drying rate MER is also lowered.
從第2圖可以得知，預定效率值η* 是個分界線。當乾燥效率ηdryer 高於預定效率值η* 時，熱泵乾衣機1000的乾燥速率MER以較為平緩之方式遞減；當乾燥效率ηdryer 低於預定效率值η* 時，熱泵乾衣機1000之乾燥速率MER以較為急遽之方式遞減。As can be seen from Fig. 2, the predetermined efficiency value η * is a dividing line. When the drying efficiency η dryer is higher than the predetermined efficiency value η * , the drying rate MER of the heat pump dryer 1000 is decreased in a relatively gentle manner; when the drying efficiency η dryer is lower than the predetermined efficiency value η * , the heat pump dryer 1000 The drying rate MER is decremented in a more impulsive manner.
換言之，當乾燥效率ηdryer 高於預定效率值η* 時，採用開放式風道，讓內部氣體排出於熱泵乾衣機1000外，可充分利用開放式風道高乾燥能力的好處。當乾燥效率ηdryer 低於預定效率值η* 時，採用封閉式風道，讓內部之高溫氣體回流，可保有較佳之能源利用率。In other words, when the drying efficiency η dryer is higher than the predetermined efficiency value η * , the open air duct is used to allow the internal gas to be discharged outside the heat pump dryer 1000, and the advantage of the open air duct high drying ability can be fully utilized. When the drying efficiency η dryer is lower than the predetermined efficiency value η * , a closed air passage is used to allow the internal high-temperature gas to recirculate, thereby maintaining a better energy utilization rate.
此外，預定效率值η* 會隨著不同季節與不同環境等因素的影響而變化。熱泵乾衣機1000可以在出廠前依據使用需求來調整預定效率值η* ，使得熱泵乾衣機1000不僅能夠獲得高乾燥能力，也能保有較佳之能源利用率。In addition, the predetermined efficiency value η * may vary depending on factors such as different seasons and different environments. The heat pump dryer 1000 can adjust the predetermined efficiency value η * according to the use requirements before leaving the factory, so that the heat pump dryer 1000 can not only obtain high drying capacity, but also maintain better energy utilization.
以下更以數張流程圖詳細說明本實施例之熱泵乾衣機1000之運作方式，然而本發明所述技術領域中具有通常知識者均可瞭解，本實施例之熱泵乾衣機1000之運作方式並不侷限於以下流程圖之說明。In the following, the operation mode of the heat pump dryer 1000 of the present embodiment will be described in detail in several flowcharts. However, those skilled in the art of the present invention can understand the operation mode of the heat pump dryer 1000 of the present embodiment. It is not limited to the description of the flowchart below.
請參照第3圖，其繪示第一實施例之氣體通道P1之控制方法的流程圖。首先，在步驟S301中，提供乾燥腔體120。Please refer to FIG. 3, which is a flow chart showing a method of controlling the gas passage P1 of the first embodiment. First, in step S301, a drying chamber 120 is provided.
接著，在步驟S303中，控制單元210控制切換單元140將氣體通道P1調整為流向D1，使得由乾燥腔體120離開之氣體排出熱泵乾衣機1000之外，而形成開放式風道。Next, in step S303, the control unit 210 controls the switching unit 140 to adjust the gas passage P1 to flow toward D1 such that the gas exiting from the drying chamber 120 exits the heat pump dryer 1000 to form an open duct.
然後，在步驟S305中，以第一量測單元410量測入口120a處之一入口溫度及一入口相對濕度(inlet relative humidity)。目前常用的濕度計所量測之數值為相對濕度，而透過溫度及相對濕度的換算，即可以獲得絕對濕度。Then, in step S305, one of the inlet temperatures and one inlet relative humidity at the inlet 120a is measured by the first measuring unit 410. At present, the commonly used hygrometer measures the relative humidity, and the temperature and relative humidity are converted to obtain the absolute humidity.
接著，在步驟S307中，以第二量測單元420量測出口120b處之一出口溫度及一出口相對濕度(outlet relative humidity)。Next, in step S307, an outlet temperature and an outlet relative humidity at the outlet 120b are measured by the second measuring unit 420.
然後，在步驟S309中，控制單元210依據入口溫度及入口相對濕度計算入口絕對濕度ωin ，並依據出口溫度及出口相對濕度計算出口絕對濕度ω out ，並依據出口溫度計算出口飽和絕對濕度ω sat , ou t 。Then, in step S309, the control unit 210 calculates the inlet absolute humidity ω in according to the inlet temperature and the inlet relative humidity, and calculates the outlet absolute humidity ω out according to the outlet temperature and the outlet relative humidity, and calculates the outlet saturated absolute humidity ω sat according to the outlet temperature. , ou t .
接著，在步驟S311中，控制單元210依據入口絕對濕度ωin 、出口絕對濕度ω ou t 及出口飽和絕對濕度ω sat , out 計算乾燥效率ηdryer 。Next, in step S311, the control unit 210 calculates the drying efficiency η dryer based on the inlet absolute humidity ω in , the outlet absolute humidity ω ou t , and the outlet saturated absolute humidity ω sat , out .
然後，在步驟S313中，控制單元210判斷乾燥腔體120之運作是否符合一預定條件。在此步驟中，控制單元210係依據入口絕對濕度ωin 、出口絕對濕度ω ou t 及出口飽和絕對濕度ω sat , out 所計算出之乾燥效率ηdryer 來進行判斷。在本實施例中，若乾燥效率ηdryer 低於預定效率值η* ，則乾燥腔體120之運作符合此預定條件。若乾燥效率ηdryer 不低於預定效率值η* ，則乾燥腔體120之運作不符合此預定條件。Then, in step S313, the control unit 210 determines whether the operation of the drying chamber 120 conforms to a predetermined condition. In this step, the control unit 210 determines the drying efficiency η dryer calculated based on the inlet absolute humidity ω in , the outlet absolute humidity ω ou t , and the outlet saturated absolute humidity ω sat , out . In the present embodiment, if the drying efficiency η dryer is lower than the predetermined efficiency value η * , the operation of the drying chamber 120 conforms to the predetermined condition. If the drying efficiency η dryer is not lower than the predetermined efficiency value η * , the operation of the drying chamber 120 does not conform to the predetermined condition.
若乾燥腔體120之運作符合於預定條件，則進入步驟S315；若乾燥腔體120之運作不符合預定條件，則回至步驟S305。If the operation of the drying chamber 120 conforms to the predetermined condition, the process proceeds to step S315; if the operation of the drying chamber 120 does not meet the predetermined condition, then the process returns to step S305.
接著，在步驟S315中，控制單元210控制切換單元140將氣體通道P1調整為流向D2，使得由乾燥腔體120離開之氣體回流至乾燥腔體120，而形成封閉式風道。Next, in step S315, the control unit 210 controls the switching unit 140 to adjust the gas passage P1 to flow to D2, so that the gas exiting from the drying chamber 120 flows back to the drying chamber 120 to form a closed air passage.
其中，步驟S305～S313係間隔一預定時間(例如是30秒鐘)執行一次。The steps S305-S313 are performed once every predetermined time interval (for example, 30 seconds).
在熱泵乾衣機1000採用封閉式風道時，冷媒可能過熱，導致系統不穩定。本實施例更透過第三量測單元430量測已冷凝之冷媒之一冷媒溫度。控制單元210更用以判斷冷媒溫度是否大於一預定溫度值。若冷媒溫度不大於預定溫度值，則控制單元210維持壓縮單元310之運作。若冷媒溫度大於預定溫度值，則控制單元210停止壓縮單元310之運作。如此一來，可以避免熱泵乾衣機1000採用封閉式風道時，冷媒溫度可能過高導致系統跳機之現象。When the heat pump dryer 1000 uses a closed air duct, the refrigerant may overheat, resulting in system instability. In this embodiment, the temperature of one of the condensed refrigerants is measured by the third measuring unit 430. The control unit 210 is further configured to determine whether the temperature of the refrigerant is greater than a predetermined temperature value. If the refrigerant temperature is not greater than the predetermined temperature value, the control unit 210 maintains the operation of the compression unit 310. If the refrigerant temperature is greater than the predetermined temperature value, the control unit 210 stops the operation of the compression unit 310. In this way, it can be avoided that when the heat pump dryer 1000 adopts a closed air duct, the temperature of the refrigerant may be too high, causing the system to trip.
請參照第4圖，其繪示第二實施例之熱泵乾衣機2000之示意圖。本實施例之熱泵乾衣機2000與第一實施例之熱泵乾衣機1000不同之處在於本實施例之熱泵乾衣機2000係以散熱單元350及切換單元360來改善冷媒過熱之情況。Please refer to FIG. 4, which is a schematic diagram of the heat pump dryer 2000 of the second embodiment. The heat pump dryer 2000 of the present embodiment is different from the heat pump dryer 1000 of the first embodiment in that the heat pump dryer 2000 of the present embodiment uses the heat dissipation unit 350 and the switching unit 360 to improve the overheating of the refrigerant.
散熱單元350用以散熱已冷凝之冷媒。本實施例之散熱單元350可以採用自然對流為散熱機制之被動式散熱器，例如是加大散熱鰭片的散熱器。或者，本實施例之散熱單元350亦可採用加裝對流風扇，以強制對流為散熱機制之主動式散熱器。The heat dissipation unit 350 is configured to dissipate the condensed refrigerant. The heat dissipation unit 350 of the embodiment can adopt a passive heat sink with natural convection as a heat dissipation mechanism, for example, a heat sink that increases heat dissipation fins. Alternatively, the heat dissipation unit 350 of the embodiment may also be an active heat sink that is equipped with a convection fan to force the convection to be a heat dissipation mechanism.
切換單元360用以切換已冷凝之冷媒先流經散熱單元350再流向膨脹單元330，或直接流向膨脹單元330。切換單元360例如是一三通閥。The switching unit 360 is configured to switch the condensed refrigerant to flow through the heat dissipation unit 350 to the expansion unit 330 or directly to the expansion unit 330. The switching unit 360 is, for example, a three-way valve.
若冷媒溫度不大於預定溫度值，則控制單元210控制切換單元360將冷媒通道P2切換成流向D3，使得已冷凝之冷媒直接流向膨脹單元330。If the refrigerant temperature is not greater than the predetermined temperature value, the control unit 210 controls the switching unit 360 to switch the refrigerant passage P2 to the flow direction D3 so that the condensed refrigerant flows directly to the expansion unit 330.
若冷媒溫度大於預定溫度值，則控制單元210控制切換單元360將冷媒通道P2切換成流向D4，使得已冷凝之冷媒先流經散熱單元350再流向膨脹單元330。如此一來，可以避免熱泵乾衣機2000採用封閉式風道時，冷媒溫度可能過高之現象。If the refrigerant temperature is greater than the predetermined temperature value, the control unit 210 controls the switching unit 360 to switch the refrigerant passage P2 to the flow direction D4, so that the condensed refrigerant first flows through the heat dissipation unit 350 and then flows to the expansion unit 330. In this way, it is possible to avoid the phenomenon that the temperature of the refrigerant may be too high when the heat pump dryer 2000 adopts a closed air duct.
綜上所述，雖然本發明已以諸項實施例揭露如上，然其並非用以限定本發明。本發明所屬技術領域中具有通常知識者，在不脫離本發明之精神和範圍內，當可作各種之更動與潤飾。因此，本發明之保護範圍當視後附之申請專利範圍所界定者為準。In the above, the present invention has been disclosed in the above embodiments, but it is not intended to limit the present invention. A person skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.
1000、2000．．．熱泵乾衣機1000, 2000. . . Heat pump dryer
110．．．供氣單元110. . . Gas supply unit
120．．．乾燥腔體120. . . Drying chamber
120a．．．入口120a. . . Entrance
120b．．．出口120b. . . Export
130．．．循環風扇130. . . Circulating fan
140、360．．．切換單元140, 360. . . Switching unit
150．．．排氣單元150. . . Exhaust unit
210．．．控制單元210. . . control unit
310．．．壓縮單元310. . . Compression unit
320．．．冷凝單元320. . . Condensing unit
330．．．膨脹單元330. . . Expansion unit
340．．．蒸發單元340. . . Evaporation unit
350．．．散熱單元350. . . Cooling unit
410．．．第一量測單元410. . . First measuring unit
420．．．第二量測單元420. . . Second measuring unit
430．．．第三量測單元430. . . Third measuring unit
D1、D2．．．氣體通道之流向D1, D2. . . Flow path of gas passage
D3、D4．．．冷媒通道之流向D3, D4. . . Flow of refrigerant passage
P1．．．氣體通道P1. . . Gas passage
P2．．．冷媒通道P2. . . Refrigerant channel
S301～S315．．．流程步驟S301～S315. . . Process step
第1圖繪示第一實施例之熱泵乾衣機之示意圖；1 is a schematic view showing a heat pump dryer of a first embodiment;
第2圖繪示乾燥效率與乾燥速率之關係圖；Figure 2 is a graph showing the relationship between drying efficiency and drying rate;
第3圖繪示第一實施例之氣體通道之控制方法的流程圖；以及3 is a flow chart showing a method of controlling a gas passage of the first embodiment;
第4圖繪示第二實施例之熱泵乾衣機之示意圖。Fig. 4 is a schematic view showing the heat pump dryer of the second embodiment.
S301～S315．．．流程步驟S301～S315. . . Process step
Claims (8)
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200536984A (en) * | 2004-05-06 | 2005-11-16 | Matsushita Electric Ind Co Ltd | Clothes dryer |
| TWI265991B (en) * | 2004-03-02 | 2006-11-11 | Jing-Liang Huang | Energy-saving, automatic machine shut-off method for a cloth dryer or an electric dryer |
| US20080034607A1 (en) * | 2004-12-06 | 2008-02-14 | Seung-Phyo Ahn | Clothes Dryer |
| US20090094852A1 (en) * | 2005-11-17 | 2009-04-16 | Kabushiki Kaisha Toshiba | Clothes dryer |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI265991B (en) * | 2004-03-02 | 2006-11-11 | Jing-Liang Huang | Energy-saving, automatic machine shut-off method for a cloth dryer or an electric dryer |
| TW200536984A (en) * | 2004-05-06 | 2005-11-16 | Matsushita Electric Ind Co Ltd | Clothes dryer |
| US20080034607A1 (en) * | 2004-12-06 | 2008-02-14 | Seung-Phyo Ahn | Clothes Dryer |
| US20090094852A1 (en) * | 2005-11-17 | 2009-04-16 | Kabushiki Kaisha Toshiba | Clothes dryer |
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