Patent Publication Number: US-11649974-B2

Title: Pre-cooling device dehumidifier

Description:
RELATED APPLICATIONS 
     The present invention is a Nonprovisional Application under 35 USC 111(a), claiming priority to Serial No. CN 201910769197.8, filed on 20 Aug. 2019, the entirety of which is incorporated herein by reference. 
     FIELD OF THE INVENTION 
     The present invention relates to the field of dehumidifiers, and more particularly to a dehumidifier with a pre-cooling device. 
     BACKGROUND OF THE INVENTION 
     Dehumidifier (also known as humidity extractor, dryer, and moisture remover) is mainly divided into two types: household dehumidifier and industrial dehumidifier, and the dehumidifier is a member of the air-conditioning family. The operating principle of the dehumidifier is to draw moist air into the machine and pass the air through a heat exchanger. Now, the water vapor in the air is condensed into waterdrops, and the processed dry air is discharged from the machine to the outside, and this cycle keeps the indoor humidity at an appropriate relative humidity. 
     In reality, the moist air reaching a saturated steam state and passing through an evaporator has the best condensation and dehumidification effects. However, the conventional dehumidifiers generally fail to make the moist air to reach the saturated steam state before entering into the evaporator for heat exchange, and the water vapor passing through the evaporator cannot be condensed into liquid very well, so that the condensation and dehumidification effects of the evaporator is reduced, and the dehumidification effect of the dehumidifier is poor. The present invention discloses a dehumidifier with a microchannel pre-cooler to overcome the aforementioned drawback of the conventional dehumidifier, and the microchannel pre-cooler can make the moist air to reach the saturated steam state before entering into the evaporator, so that the water vapor in the moist air reaching the saturated steam state during the heat exchange process can be condensed into liquid very well to improve the condensation and dehumidification effects of the evaporator and reduce the air humidity effectively, so as to improve the dehumidification effect of the equipment. 
     SUMMARY OF THE INVENTION 
     In view of the aforementioned drawbacks and the poor dehumidification effect of the conventional dehumidifier, it is a primary objective of the present invention to provide a dehumidifier with a pre-cooling device to overcome the drawbacks of the prior art that the moist air cannot reach the saturated steam state before entering into the heat exchange process of the evaporator, and the present invention has a microchannel pre-cooler provided for the moist air to enter into the saturated steam state before entering into the evaporator, and the moist air is cooled to reach the saturated steam state during the heat exchange process, so that the water vapor in the moist air can be condensed into liquid very well to improve the condensation and dehumidification effects of the evaporator and reduce the air humidity effectively, so as to improve the dehumidification effect of the equipment. 
     To achieve the aforementioned and other objectives, the present invention discloses a dehumidifier with a pre-cooling device comprising: a compressor, a condenser, an expansion mechanism, a microchannel pre-cooler and an evaporator assembly, characterized in that moist air enters from an air inlet formed on a casing of the dehumidifier, and passes through the microchannel pre-cooler to make moist air to reach a saturated steam state, and further passes through the evaporator assembly to perform heat exchange in order to condense and dehumidify the moist air, and the dehumidified air passes through the condenser for heating, and finally discharged from the air outlet, wherein a refrigerant used in the condenser, the expansion mechanism, the microchannel pre-cooler, and the evaporator assembly is delivered by a pipeline, and a refrigeration cycle is completed by the compressor. 
     Further, a throttling capillary is installed between the microchannel pre-cooler and the evaporation mechanism for changing a cold fluid refrigerant into a cold liquid refrigerant. 
     Further, the dehumidifier comprises an expansion device and an auxiliary expansion device, and a hot liquid refrigerant passing through the condenser flows into the expansion device and the auxiliary expansion device separately. 
     Further, the hot liquid refrigerant flowing out from the condenser passes through the expansion device to expand the volume and reduce the temperature and pressure of the refrigerant before entering into the microchannel pre-cooler. 
     Further, the hot liquid refrigerant flowing out from the condenser passes through the auxiliary expansion device to expand the volume and reduce temperature and pressure of the refrigerant before entering into the subcooler. 
     Further, the subcooler receives a cold liquid refrigerant from the auxiliary expansion device and evaporates the cold liquid refrigerant to form a cold gas refrigerant. 
     Further, the cold gas refrigerant produced by the evaporator assembly and the subcooler reaching a confluence and passing through the compressor becomes a hot gas refrigerant, and then the compressor delivers the hot gas refrigerant to the condenser to complete a refrigeration cycle. 
     Further, the evaporator assembly has one or two evaporators. 
     Compared with the prior art, this invention has the following advantages and effects: This invention has a microchannel pre-cooler, so that the moist air can reach the saturated steam state before entering into the evaporator, and the water vapor in the moist air reaching the saturated steam state before entering into the heat exchange can be condensed into liquid very well to improve the condensation and dehumidification of the evaporator and reduce the air humidity, so as to improve the dehumidification effect of the equipment. 
     The technical characteristics of the present invention will become apparent with the detailed description of preferred embodiments accompanied with the illustration of related drawings as follows. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a schematic view of a first embodiment of the present invention; 
         FIG.  2    is a schematic view of a second embodiment of the present invention: 
         FIG.  3    is a schematic view of a third embodiment of the present invention: 
         FIG.  4    is a schematic view showing the status of airflow during the operation of the present invention; 
         FIG.  5    is a perspective view of the present invention. 
     
    
    
     BRIEF DESCRIPTION OF NUMERALS USED IN THE DRAWINGS 
       1 : Casing;  2 : Microchannel pre-cooler;  3 : Evaporator assembly;  31 : First evaporator:  32 : Second evaporator:  4 : Condenser:  5 : Compressor:  6 : Auxiliary expansion device:  7 : Throttling capillary:  8 : Expansion device;  9 : Subcooler. 
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     With reference to  FIG.  1    and  FIG.  5    for a dehumidifier with a pre-cooling device in accordance with the first embodiment of the present invention, the dehumidifier comprises a casing  1 , a microchannel pre-cooling device  2 , an evaporator assembly  3 , a condenser  4 , and an expansion mechanism, wherein the refrigerant used in the microchannel pre-cooling device  2 , evaporator assembly  3 , condenser  4 , and expansion mechanism are delivered by a pipeline, and the compressor  5  is provided for completing a refrigeration cycle. 
     During the cycle, the compressor  5  sends a hot gas refrigerant to the condenser  4  to be processed by a heat exchange of the condenser  4  and then the hot liquid refrigerant flows out from the condenser  4  and into the expansion mechanism, wherein the expansion mechanism comprises an expansion device  8  and an auxiliary expansion device  6 . After the flow the hot gas refrigerant is divided, a part of the hot liquid refrigerant passing through the expansion device  8  is expanded to reduce the temperature and pressure of the refrigerant and entered into the microchannel pre-cooler  2 , and the other part of the hot liquid refrigerant is passed through the auxiliary expansion device  6  and expanded to reduce the temperature and pressure of the refrigerant and entered into the subcooler  9 . 
     Further, a throttling capillary  7  is installed between the microchannel pre-cooler  2  and the evaporation mechanism  3  and provided for changing a cold fluid refrigerant flowing out from the microchannel pre-cooler  2  into a cold liquid refrigerant, and the cold liquid refrigerant is passed into the evaporation mechanism  3  for a heat exchange. After the heat exchange is completed, the cold liquid refrigerant is changed into cold air refrigerant which flows out from the evaporation mechanism  3 . 
     Further, the subcooler  9  receives a cold liquid refrigerant from the auxiliary expansion device  6 , and evaporates the cold liquid refrigerant to form a cold gas refrigerant, and the cold gas refrigerant flowing out from the evaporation mechanism  3  and the cold gas refrigerant flowing out from the subcooler  9  are combined and the combined cold gas refrigerant flows towards the compressor  5 . 
     Further, the cold gas refrigerant produced by the evaporation mechanism  3  and the subcooler  9  is passed through the compressor  5  and changed into a hot gas refrigerant, and then the compressor  5  delivers the hot gas refrigerant into the condenser  4  to complete a refrigeration cycle. 
     During the operation of the dehumidifier, referring to  FIG.  4   , an airflow A 1  entering from an air inlet formed on the casing  1  passes through the microchannel pre-cooler  2  to make the moist air to reach a saturated steam state, and the water vapor of the airflow A 2  reaching the saturated steam state in the heat exchange process of the evaporation mechanism  3  can be condensed into liquid very well to improve the condensation and dehumidification of the evaporator effectively, and the dehumidified airflow A 3  is heated by the condenser  4  and finally the airflow A 4  is discharged from the air outlet. 
     With reference to  FIG.  2    and  FIG.  5    for a dehumidifier with a pre-cooling device in accordance with the second embodiment of the present invention, the dehumidifier is based on the first embodiment, and the evaporation mechanism  3  of the second embodiment has two evaporators: a first evaporator  31  and a second evaporator  32  respectively, wherein the cold gas refrigerant flowing out from the subcooler  9  enters into the second evaporator  32  for a heat exchange, and the cold gas refrigerants flowing out from the first evaporator  31  and the second evaporator  32  are combined and entered into the compressor  5  to complete a refrigeration cycle. In the second embodiment 2, the evaporation mechanism  3  has two evaporators, so that when the airflow A 2  passes through the evaporation mechanism  3 , the condensation and dehumidification can be carried out sufficiently to obtain an airflow A 4  having a lower relative humidity to improve the dehumidification effect of the equipment. 
     With reference to  FIG.  3    and  FIG.  5    for a dehumidifier with a pre-cooling device in accordance with the second embodiment of the present invention, the dehumidifier is based on the second embodiment, and the evaporation mechanism  3  also has two evaporators: a first evaporator  31  and a second evaporator  32  respectively, and a throttling capillary  7  is installed between the first evaporator  31  and the second evaporator  32 , and a cold fluid refrigerant flowing out from the microchannel pre-cooler flows into the second evaporator  32  for a heat exchange, and the refrigerant flowing out from the throttling capillary  7  after the heat exchange process enters into the first evaporator  31 , wherein the cold gas refrigerant flowing out from the subcooler  9  and the cold gas refrigerant flowing out from the first evaporator  31  are combined and entered into the compressor  5  to complete a refrigeration cycle. 
     This invention has a microchannel pre-cooler to make the moist air to reach the saturated steam state before entering into the evaporator, and the water vapor in the moist air reaching the saturated steam state in the heat exchange process conducted by the evaporator can be condensed into liquid very well to improve the condensation and dehumidification effects of the evaporator and reduce the air humidity effectively, so as to improve the dehumidification effect of the equipment. Since there are two evaporators of the evaporation mechanism in the second embodiment, therefore the moist air can be condensed and dehumidified very well to obtain air with a low relative humidity and improve the dehumidification effect of the equipment. 
     While the invention has been described by means of specific embodiments, numerous modifications and variations could be made thereto by those skilled in the art without departing from the scope and spirit of the invention as set forth in the claims.