Patent Publication Number: US-2016223230-A1

Title: Evaporator with heat dissipating fins and refrigerant heat dissipating apparatus using the same

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims the benefit of Taiwan patent application No. 104201792, filed on Feb. 4, 2015, the disclosure of which is incorporated herein in its entirety by reference. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a heat dissipating apparatus, and more particularly to a refrigerant heat dissipating apparatus and an evaporator with heat dissipating fins thereof. 
     2. Description of Related Art 
     When a conventional electronic device is working, the electronic device usually generates heat. In order to avoid malfunction or damage of the electronic device when the temperature of the electronic device is too high, a heat dissipating apparatus is installed at a heat generative source of the electronic device. The heat dissipating apparatus absorbs heat generated from the heat generative source and quickly conducts the heat to the outside. 
     The structure of the conventional refrigerant heat dissipating apparatus in the electronic device includes a plurality of conductive tubes connected between two condensing tubes. A plurality of heat dissipating fins is connected to the conductive tubes to form a condenser. The refrigerant heat dissipating apparatus also includes a heat dissipating element contacting the heat source, and two opposite sides of the heat dissipating element respectively have one of the conductive tubes connected with the two condensing tubes so as to form a closed recurring cycle. A refrigerant is filled into the closed recurring cycle, and the refrigerant absorbs heat within the heat dissipating element and flows from the refrigerant tubes of the condenser to each of the conductive tubes. The heat dissipating fins contact the conductive tube to conduct heat, and the refrigerant within the conductive tube is cooled down and passes through the refrigerant tube to flow back to the heat dissipating tube. Therefore, the heat dissipating apparatus with heat cycling function provides a cooling mechanism for the heat generative source of the electronic device. 
     Although the aforementioned refrigerant heat dissipating apparatus provides heat dissipating function for the heat generative source of the electronic device. However, the positions of the two conductive tubes between the heat dissipating element and the condenser are not installed properly such that the refrigerant cycling flow of the refrigerant heat dissipating apparatus is not good enough. In order to solve the aforementioned problems in the conventional refrigerant heat dissipating apparatus, a conventional refrigerant heat dissipating apparatus implements a first refrigerant tube. The first refrigerant tube tilts and extends from a top of an evaporator. The first refrigerant tube is connected with a top section of the condensing tube at one side of the condenser. The conventional refrigerant heat dissipating apparatus also implements a second refrigerant tube. The second refrigerant tube is connected with a bottom section of the condensing tube at another side of the condenser, which is laterally connected with an evaporating side. Therefore, when the refrigerant within the evaporator absorbs heat and is converted to the gaseous state, the refrigerant can flow along the first refrigerant tube and evaporate within the condenser. When the refrigerant within the evaporator dissipates heat and is converted to the liquid state, the refrigerant smoothly flows along the lateral second refrigerant tube into the evaporator. The condenser is a flat assembled structure to reduce a height of the apparatus, so the refrigerant can smoothly flow within the closed refrigerant recurring cycle to achieve a high efficiency heat dissipating effect. 
     The heat dissipating efficiency of the aforementioned refrigerant heat dissipating apparatus is better than the conventional heat dissipating apparatus. However, the heat dissipating efficiency by implementing the conversion of the refrigerant between the gaseous and liquid states and the flowing mechanism of the refrigerant between the evaporator and the condenser is limited. In order to enhance an overall heat dissipating efficiency in the refrigerant heat dissipating apparatus, it is necessary to have a further improvement. 
     SUMMARY OF THE INVENTION 
     An objective of the present invention is to provide an evaporator with heat dissipating fins and a refrigerant heat dissipating apparatus using the same to enhance a heat dissipating effect in the conventional refrigerant heat dissipating apparatus. 
     The evaporator with heat dissipating fins is provided in the present invention and comprises: 
     an evaporator body having:
         an evaporating chamber disposed within the evaporator body;   a heat dissipating plate disposed at a bottom of the evaporator body;   a refrigerant outlet disposed at a top of the evaporator body and communicating with the evaporating chamber; and   a refrigerant inlet disposed at a lateral side of the evaporator and communicating with the evaporating chamber; and       

     a plurality of heat dissipating fins arranged at a peripheral surface of the evaporator body and heat conductively connected to the evaporator body. 
     In order to achieve the aforementioned objective, a refrigerant heat dissipating apparatus comprises: 
     an evaporator with heat dissipating fins, the evaporator including:
         an evaporator body having:
           an evaporating chamber disposed within the evaporator body;   a heat dissipating plate disposed at a bottom of the evaporator body;   a refrigerant outlet disposed at a top of the evaporator body and communicating with the evaporating chamber; and   a refrigerant inlet disposed at a lateral side of the evaporator and communicating with the evaporating chamber; and   
           a plurality of heat dissipating fins arranged at a peripheral surface of the evaporator body and heat conductively connected to the evaporator body;       

     a condenser including:
         two condensing tubes horizontally disposed and spaced at an interval;   a plurality of heat dissipating tubes vertically disposed and spaced at intervals, and the heat dissipating tubes disposed from top to down between the two condensing tubes and parallel to each other;   a plurality of heat dissipating elements distributed on outer surfaces of the heat dissipating tubes and contacting the outer surfaces of the heat dissipating tubes;       

     a first refrigerant tube, and one end of the first refrigerant tube connected with the refrigerant outlet at the top of the evaporator body and another end of the first refrigerant tube obliquely extended upward and connected with a top section of one of the two condensing tubes at one side of the condenser; 
     a second refrigerant tube, and one end of the second refrigerant tube connected with the refrigerant inlet at the lateral side of the evaporator body and another end of the second refrigerant tube laterally extended and connected with a bottom section of the other one of the two condensing tubes at another side of the condenser so as to form a closed refrigerant recurring cycle by the evaporator, the condenser, the first refrigerant tube and the second refrigerant tube; and 
     a refrigerant filled into the refrigerant recurring cycle and flowing within the refrigerant recurring cycle in accordance with a liquid and gaseous state conversion. 
     The development of the evaporator with the heat dissipating fins and the refrigerant heat dissipating apparatus using the same are to install multiple heat dissipating fins in the evaporator body, which includes an evaporating chamber. The refrigerant heat dissipating apparatus is to have the first refrigerant tube and the second refrigerant tube connected between the evaporator and the condenser to form a closed recurring cycle and fill the refrigerant into the closed recurring cycle. When the evaporator body of the evaporator absorbs heat generated by a heat generative source, the refrigerant within the evaporator body is converted to be gaseous by absorbing heat. The refrigerant in the gaseous state is flowing upward to conduct heat to the top of the evaporator body with the heat dissipating fins. The heat dissipating fins quickly conduct heat and most of the refrigerant in the gaseous state is condensed to the liquid state. The refrigerant in the liquid state flows downward and absorbs heat generated by the heat generative source again. Therefore, most of the heat generated by the heat generative source vanishes quickly via the evaporator. The rest of the refrigerant in the gaseous state, which is not condensed, passes through the first refrigerant tube into the condenser. The refrigerant in the gaseous state releases heat by the condenser and is converted to the liquid state. The refrigerant in the liquid state flows back to the evaporator body via the second refrigerant tube to absorb heat again. Therefore, the refrigerant heat dissipating apparatus can achieve a high efficient heat dissipating effect. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of an evaporator in a preferred embodiment of the present invention; 
         FIG. 2  is a perspective view of a refrigerant heat dissipating apparatus in the preferred embodiment of the present invention; 
         FIG. 3  is a perspective view of the refrigerant heat dissipating apparatus in another preferred embodiment of the present invention; 
         FIG. 4  is a side schematic view of the refrigerant heat dissipating apparatus in the preferred embodiment shown in  FIG. 2 ; 
         FIG. 5  is an operating view of the refrigerant heat dissipating apparatus in the preferred embodiment shown in  FIG. 2 ; and 
         FIG. 6  is a partially enlarged view of  FIG. 5 . 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     These and other aspects of the embodiments herein will be better appreciated and understood when considered in conjunction with the following description and the accompanying drawings. 
     With reference to  FIG. 1  and  FIG. 2 , the present invention relates to an evaporator  1  with heat dissipating fins and a refrigerant heat dissipating apparatus. With reference to  FIG. 2  and  FIG. 3 , the refrigerant heat dissipating apparatus includes the evaporator  1 , a condenser  2 , a first refrigerant tube  3 , a second refrigerant tube  4 , and an appropriate amount of refrigerant  5 . 
     With reference to  FIG. 1 ,  FIG. 2  and  FIG. 4 , the evaporator  1  includes an evaporator body  10  and multiple heat dissipating fins  14 . The evaporator body  10  is a hollow body made of a heat dissipating material and the evaporator body has an evaporating chamber  100 . The evaporator body  10  includes a heat dissipating plate  11 , a refrigerant outlet  12  and a refrigerant inlet  13 . The evaporating chamber  100  is disposed within the evaporator body  10 . The heat dissipating plate  11  is disposed at a bottom of the evaporator body  10 . The refrigerant outlet  12  is disposed at a top of the evaporator body  10  and communicates with the evaporating chamber  100 . The refrigerant inlet  13  is disposed at a lateral side of the evaporator body  10  and communicates with the evaporating chamber  100 . The heat dissipating fins  14  are sheet-like and made of heat conductive materials. The heat dissipating fins  14  are arranged at a peripheral surface of the evaporator body  10  and are heat conductively connected to each other. An air flow channel is formed between every two adjacent heat conduction fins  14 . 
     With reference to  FIG. 2  or  FIG. 3 , the condenser  2  includes two condensing tubes  2 A,  2 B, a plurality of heat dissipating tubes  20 , and a plurality of heat dissipating elements  21 . Interiors of the condensing tubes  2 A,  2 B each respectively include a closed chamber. The two condensing tubes  2 A,  2 B are laterally arranged and spaced at an interval. The heat dissipating tubes  20  are tubes with heat conductive capabilities. The heat dissipating tubes  20  are disposed from top to bottom between the two condensing tubes  2 A,  2 B and are parallel to each other. The heat dissipating elements  21  are discretely disposed and thermally contacted with outer surfaces of the heat dissipating tubes  20 . The heat dissipating elements  21  may be heat dissipating sheets, wavy sheets or any other structures with larger heat dissipating surface. As shown in the preferred embodiment in  FIG. 2  or  FIG. 3 , the heat dissipating element  21  is a wavy sheet. As shown in the preferred embodiment in  FIG. 2 , the heat dissipating tube  20  of the condenser  2  is parallel to a longitudinal direction of arrangement of the heat dissipating fins  14  in the evaporator  1 . Alternatively, as shown in the preferred embodiment in  FIG. 3 , the heat dissipating tube  20  of the condenser  2  is perpendicular to the longitudinal direction of arrangement of the heat dissipating fins  14  in the evaporator  1 . The direction of the air flow channel between the adjacent heat dissipating fins  14  is the same as the direction of the air flowing through the heat dissipating element  21 . 
     With reference to  FIG. 2  and  FIG. 4 , one end of the first refrigerant tube  3  is bent downward and connected with the refrigerant outlet  12  at the top of the evaporator body  10 . The first refrigerant tube  3  is laterally extended and another end of the first refrigerant tube  3  is connected with a top section of one of the two condensing tube  2 A, which communicates with one side of the condenser  2 . One end of the second refrigerant tube  4  is connected with the refrigerant inlet  13  at the lateral side of the evaporator body  10 , and the second refrigerant tube  4  is laterally extended and another end of the second refrigerant tube  4  is connected with a bottom section of the condensing tube  2 B, which communicates with another side of the condenser  2  so as to form a closed refrigerant recurring cycle by the evaporator body  10 , the condenser  2 , the first refrigerant tube  3  and the second refrigerant tube  4 . The refrigerant  5  is filled into the closed recurring cycle and the refrigerant  5  may have liquid and gaseous state conversion and flows in the refrigerant recurring cycle. 
     When the refrigerant heat dissipating apparatus of the present invention is used to cool down the electronic device, with reference to  FIG. 2 ,  FIG. 5  and  FIG. 6 , the heat dissipating plate  11  at the bottom of the evaporator body  10  of the evaporator  1  in the refrigerant heat dissipating apparatus is heat conductively contacted with the heat generative source  6  of the electronic device. The heat dissipating plate  11  is used to conduct the heat generated by the heat generative source  6  via the evaporator body  10  to the refrigerant  5  within the evaporator body  10 . The refrigerant  5  within the evaporator body  10  absorbs heat and is converted to the gaseous state. The refrigerant  5  in the gaseous state flows upward to conduct heat to the top of the evaporator body  10  with the heat dissipating fins  14 . The heat dissipating fins  14  quickly conduct heat and most of the refrigerant  5  in the gaseous state is condensed to liquid state. The refrigerant  5  in the liquid state flows downward and absorbs heat generated by the heat generative source  6  again. Therefore, most of the heat generated by the heat generative source  6  is dissipated quickly via the evaporator  1 . The rest of the refrigerant  5  in the gaseous state, which is not condensed, passes through the first refrigerant tube  3  into the condenser  2 . The refrigerant  5  in the gaseous state firstly flows to the condensing tube  2 A at one side of the condenser  2  and disperses from the condensing tube  2 A to the condensing tube  2 B at another side of the condenser  2  via the heat dissipating tube  20 . In this process, the heat is conducted and contacted with the heat dissipating elements  21  of the heat dissipating tubes  20  and an enlarged heat dissipating surface of the heat dissipating elements  21  is used to dissipate heat quickly and cool down the refrigerant  5  in the gaseous state within the heat dissipating tube  20  to condense to liquid state. Thereafter, the refrigerant  5  in the liquid state flows back to the evaporator body  10  of the evaporator  1  via the second refrigerant tube  4  to absorb heat again. By the recurring cycle, the refrigerant heat dissipating apparatus can achieve a high efficient heat dissipating effect. 
     While the present invention has been described in terms of what are presently considered to be the most practical and preferred embodiments, it is to be understood that the present invention need not be restricted to the disclosed embodiment. On the contrary, it is intended to cover various modifications and similar arrangements included within the spirit and scope of the appended claims which are to be accorded with the broadest interpretation so as to encompass all such modifications and similar structures. Therefore, the above description and illustration should not be taken as limiting the scope of the present invention which is defined by the appended claims.