Patent Publication Number: US-2010122797-A1

Title: Assembly type oil cooler for intensively cooling hydraulic machinery

Description:
TECHNICAL FIELD 
     The present invention relates to a hydraulic-operating oil cooling apparatus for cooling hydraulic-operating oil used in various hydraulic machines using hydraulic pressure, and more particularly, to an assembly type hydraulic-operating oil cooling apparatus for a hydraulic machine, which is very convenient in maintenance and repair because a body of the oil cooling apparatus is constructed of several units, and is very excellent in cooling efficiency because cooling water flows through the inside of a heat exchange pipe of the hydraulic-operating oil cooling apparatus as well as the inside of the units. 
     BACKGROUND ART 
     In general, hydraulic machinery such as an injection molding apparatus or a press machine is provided with a cylinder for converting pressure energy into kinetic energy by using hydraulic-operating oil. When the cylinder is operated, heat is generated to thereby increase the temperature of the hydraulic-operating oil. As a result, there occur problems that the machinery is erroneously operated and working efficiency is reduced. 
     In order to solve such a problem, most hydraulic machine necessarily includes a hydraulic-operating oil cooling apparatus for cooling high-temperature hydraulic-operating oil and supplying it again to the hydraulic machine. 
     However, the hydraulic-operating oil cooling apparatus entails problems in that its assembly and maintain/repair are difficult because several heat exchange pipes are disposed at the inside of one body thereof. 
     DISCLOSURE OF INVENTION 
     Technical Problem 
     Accordingly, the present invention has been made to solve the above problems occurring in the prior art, and it is an object of the present invention to provide a hydraulic-operating oil cooling apparatus, which is excellent in cooling efficiency and is easy to maintain and repair, and wherein its mass production is easy due to a simple structure and its manufacture time can be drastically reduced because assembly of parts thereof is simple and easy. 
     Technical Solution 
     To achieve the above object, the present invention provides an assembly type hydraulic-operating oil cooling apparatus, wherein a desired number of units are bolt-engaged with each other in series to form a body of the hydraulic-operating oil cooling apparatus, each unit being formed with engaging holes and body cooling water passageways in the circumferential direction thereof, a packing is inserted into an intermediate portion of each unit in such a manner that projecting portions alternately confront each other, and an oil inlet and an oil outlet are formed respectively at the units engaged at both sides of the body, wherein cap clogging plates are engaged at both sides of the body, and heat exchange pipes and support rods are respectively inserted into heat exchange pipe engaging openings and support rod engaging holes, and the supporting rods are further inserted into support rod holes of clogging plates attached to the projecting portions of the packing, and wherein a cooling water inlet  4  and a cooling water outlet, which are separated from each other by a partition, are formed at one side of the cap clogging plate, which is engaged at both sides of the body, a front cap formed with cooling water body inlets in the radial direction is also engaged at one side of the cap clogging plate, and a rear cap formed with cooling water body inlets in the radial direction is engaged at the other side of the cap clogging plate, which is engaged at both sides of the body. 
     Advantageous Effects 
     Therefore, according to the present invention, the cooling efficiency is excellent because cooling water flows through the inside of the heat exchange pipe as well as inside of the body thereof, it is possible to easily disassemble and clean the hydraulic-operating oil cooling apparatus when impurities are concentrated at the inside of the hydraulic-operating oil cooling apparatus. In addition, the present invention is very useful because exchange of the damaged parts can be carried out after disassembling them without a necessity of changing the entire hydraulic-operating oil cooling apparatus, when the parts thereof are damaged, so that the hydraulic-operating oil cooling apparatus is easy and simple to maintain/repair and assemble, thereby resulting in a drastic reduction of the manufacturing cost. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a view showing a use state of the present invention; 
         FIG. 2  is a perspective view of the present invention; 
         FIG. 3  is an exploded perspective view of a rear cap of a hydraulic-operating oil cooling apparatus; 
         FIG. 4  is a view showing a state of a cap clogging plate to be engaged with a heat exchange pipe; 
         FIG. 5  is a partial cross-sectional perspective view of a unit; 
         FIG. 6  is an exploded perspective view of the clogging plate engaged at an intermediate portion of the unit; 
         FIG. 7  is a perspective view of other type of the clogging plate engaged at an intermediate portion of the unit; 
         FIG. 8  is a structural view of a front cap; 
         FIG. 9  is a structural view of a rear cap; 
         FIG. 10  is a cross-sectional view of the present invention; 
         FIG. 11  is an exploded perspective view of one embodiment of the present invention; and 
         FIG. 12  is an exploded perspective view of another embodiment of the present invention. 
     
    
    
     MODE FOR THE INVENTION 
     Hereinafter, the preferred embodiments of the present invention will be described in detail with reference to the appended drawings. 
     In the drawings,  FIG. 1  is a view showing a use state of the present invention. 
     As shown in  FIG. 1 , a cooling water inlet  4  and a cooling water outlet  5  of a hydraulic-operating oil cooling apparatus  1  is connected to a cooling water tank  6  so that cooling water can circulate through the inside of a heat exchange pipe  20  disposed at the inside of the hydraulic-operating oil cooling apparatus  1 , an oil inlet  2  and an oil outlet  3  of the hydraulic-operating oil cooling apparatus  1  are connected to a hydraulic machine so that hot hydraulic-operating oil can flow through the outer side of the heat exchange pipe  20  disposed at the inside of the hydraulic-operating oil cooling apparatus  1 . 
     In this regard, heat exchange is produced between the hot hydraulic-operating oil, which is circulating from the hydraulic machine to the hydraulic-operating oil cooling apparatus  1 , and the cooling water circulating from the cooling water tank  6  through the inside of the heat exchange pipe  20  disposed at the inside of the hydraulic-operating oil cooling apparatus  1 , so that the hot hydraulic-operating oil is cooled and supplied again to the hydraulic machine. 
       FIG. 2  is a perspective view showing the hydraulic-operating oil cooling apparatus of the present invention. 
     As shown in  FIG. 2 , the hydraulic-operating oil cooling apparatus  1  of the present invention comprises several units  10  arranged in series, and two cap clogging plates  9 , two rear caps  8  and two front caps  7  are respectively engaged at both ends of the respective unit  10 . An oil inlet  2  and an oil outlet  3  are formed above the unit  10 , which are engaged at both ends among the several units  10  forming the body of the hydraulic-operating oil cooling apparatus  1  after they are connected in series, and a cooling water inlet  4  and a cooling water outlet  5  are formed at the front cap  7 . 
       FIG. 3  is an exploded perspective view showing a rear cap  8  and a cap clogging plate  9  of the hydraulic-operating oil cooling apparatus  1  of the present invention. 
     A rear cap  8  is engaged at one side of the body of the hydraulic-operating oil cooling apparatus  1 , which is constructed by engaging several units  10  in series as shown in  FIG. 2 , and two cap clogging plates  9  are disposed at an intermediate portion of the rear cap  8  and the body constructed by engaging several units  10  as shown in  FIG. 3 , and a sealing  16  is inserted between the two cap clogging plates  9 . 
     As shown in  FIG. 3 , a hole-shaped heat exchange pipe engaging opening  19  is formed at each cap clogging plate  9 , and a sealing recess  17  is formed at one side of the cap clogging plate  9  by chamfering the heat exchange pipe engaging opening  19 , as shown in  FIG. 3 . Then, a sealing member is mounted on a portion where the sealing recess  17  is machined at the heat exchange pipe engaging opening  19 , i. e., at a portion where the heat exchange pipe engaging openings  19  formed at the two cap clogging plates  9  are formed when the two cap clogging plates  9  are engaged with each other. 
     The reason of inserting the sealing member  16  between the two cap clogging plates  9  is to prevent leakage of the hydraulic-operating oil, which flows through the inside of the unit  10 , through a gap of the heat exchange pipe engaging opening  19  of the cap clogging plate  9 . 
     In addition to the method as described above, the present invention can be carried out with using one cap clogging plate  9 . In this regard, a heat exchange pipe  20  is inserted into a cap clogging plate  9  formed with a heat exchange pipe engaging opening  19 , and the heat exchange pipe  20  is brought into contact with the heat exchange pipe engaging opening  19  of the cap clogging plate  9  by using a pipe enlarging device so that the leakage of the hydraulic-operating oil flowing through the inside of the unit  10  can be prevented. 
     Moreover, as shown in  FIG. 3 , the rear cap  8  engaged at one side of the hydraulic-operating oil cooling apparatus  1  constructed by engaging several units  10 , and the front cap  7  engaged at the other side of the body are engaged with the body by means of the two cap clogging plates  9 . In this instance, only one cap clogging plate  9  can be used as described above. 
     In the present embodiment, a plurality of heat exchange pipes  20  are installed at the inside of the body constructed by engaging several units  10 , each of the heat exchange pipe  20  is securely inserted into the heat exchange pipe engaging opening  19  of the cap clogging plate  9  mounted at both sides of the body, as shown in  FIG. 4 . The heat exchange pipe  20  is formed with thread-shaped fins  21  at the outer surface thereof, as shown in  FIG. 4 . In this regard, when the heat exchange pipe  20  is inserted into the heat exchange pipe engaging opening  19  of the cap clogging plate  9 , it is carried out in such a manner that the thread shaped fins  21  formed at the heat exchange pipe  20  overlap with each other. 
     In other words, the heat exchange pipe  20  is inserted into the heat exchange pipe engaging opening  19  of the cap clogging plate  20  in such a manner that the fins  21  formed at the outer surface of the heat exchange pipe  20  to be installed are disposed to be overlapped with the fins  21  of the heat exchange pipe  20 , which has been already installed, as shown in  FIG. 4 . The thread-shaped fins  21  are inserted into the heat exchange pipe engaging openings  19  while being overlapped with the fins  21  of the other heat exchange pipe  20  when the heat exchange pipe  20  is rotated. 
     Thus, when the hydraulic-operating oil cooling apparatus is constructed in such a manner that fins  21  of the heat exchange pipe  20  are overlapped with each other, more heat exchange pipes  20  can be installed at the inside of the hydraulic-operating oil cooling apparatus  1  to thereby improve the cooling efficiency. 
       FIG. 5  is a partial perspective view of the unit  10  constituting the body of the hydraulic-operating oil cooling apparatus  1 , when several units are engaged with each other. 
     As shown in  FIG. 5 , an engaging groove  14  is formed at one side of the unit  10 , a projection  15  is formed at the other side and a cooling water passageway  18  and an engaging hole  13  are formed at the inside of the unit  20 . 
       FIG. 6  is a perspective view showing a packing  23  inserted into an intermediate portion of the unit  10 , when each unit  10  is engaged. As shown in  FIG. 6 , the packing  23  made of rubber material and formed in a donut shape, is formed with a projecting portion  31 , an engaging hole  13  and a cooling water passageway  18 . In addition, clogging plates  24 , each of which is formed with a support rod hole  25 , are engaged at both sides of the projecting portion  31  of the packing  23 . 
       FIG. 7  shows another embodiment of a packing  23  inserted into an intermediate portion of the unit  10  when each unit  10  is engaged. As shown in  FIG. 7 , the packing  23  and the clogging plate  24  can be integrally constructed by inserting the clogging plate  24  into the projecting portion  31  of the packing  23 . 
       FIG. 8  is a structural view of a front cap  7 , and  FIG. 9  is a structural view showing a rear cap  8 . 
     As shown in  FIG. 8 , the front cap  7  is formed with a cooling water inlet  4  and a cooling water outlet  5 , and a partition  26  is provided between the cooling water inlet  4  and the cooling water outlet  5  to separate the cooling water inlet  4  and the cooling water outlet  5 . In addition, an engaging hole  13  and a cooling water body inlet  12  are formed alternatively at the front cap  7  and the rear cap  8 . Hereinafter, the present invention as constructed above will be explained in detail. 
       FIG. 10  is a cross-sectional view of a hydraulic-operating oil cooling apparatus of the present invention, and  FIG. 11  is an exploded perspective view of a hydraulic-operating oil cooling apparatus of the present invention. 
     As shown in  FIG. 10  and  FIG. 11 , in the present embodiment of the invention, a body of the hydraulic-operating oil cooling apparatus  1  is formed by engaging several units  10  in series, and a packing  23  formed with a clogging plate  24  is inserted into an intermediate portion of the unit  10  when each unit  10  is engaged with each other, and an oil inlet  2  and an oil outlet  3  are formed at the unit engaged at both ends thereof. 
     In this instance, as shown in  FIG. 10 , the clogging plate  24  can be firmly secured at the inside of the body of the hydraulic-operating oil cooling apparatus  1  by constructing that the supporting rod groove  22  of the packing  23  and the supporting rod groove  22  of the clogging plate  24  should be inserted into the support rod  28 , when the packing is inserted into an intermediate portion of the unit  10 . 
     As described above, according to the hydraulic-operating oil cooling apparatus of the present invention, two cap clogging plates  9  are engaged at both ends of the body of the hydraulic-operating oil cooling apparatus, to which several units  10  are engaged in series, and a sealing member  16  is mounted on a sealing recess  17  formed at a heat exchange pipe engaging opening  19  of a cap clogging plate  9  to thereby prevent leakage of the hydraulic-operating oil in the body. The front cap  7  and the rear cap  8  are engaged at both sides of the body as constructed above. In addition, the unit  10  and the cap clogging plate  9  are firmly secured because concave engaging grooves  14  are formed at one side of each unit  10  and the cap clogging plate  9 , and convex projections  15  are formed at the other side thereof. 
     The front cap  7  is formed with a cooling water inlet  4  and a cooling water outlet  5 , which are separated from each other by a partition  26 , and the rear cap  8  is formed with a circulation water chamber  11 , and a cooling water body inlet  12  is formed at the front cap  7  and the rear cap  8  to communicate them to a body cooling water passageway  18 . 
     When the hydraulic-operating oil of the hydraulic machine is introduced through the oil inlet  2 , as shown in  FIG. 10 , the hydraulic-operating oil passes through the heat exchange pipe  20  in the zigzag direction due to the clogging plate  24  formed at the packing  23  and is discharged through the oil outlet  3  and supplied into again to the hydraulic machine. When the cooling water is supplied through the cooling water inlet  4  of the front cap  7 , a portion of the cooling water passes through the inside of the heat exchange pipe  20  engaged with the cap clogging plate  9  and passes through the circulation water chamber  11  of the rear cap  8  and again through the heat exchange pipe  20  and is collected in a discharge water chamber  27  formed at the front cap  7  and discharged through the cooling water outlet  5 . 
     As shown in  FIG. 10 , a portion of the cooling water supplied through the cooling water inlet  4  passes through the cooling water body inlet  12  of the front cap  7  and the body cooling water passageway  18  of each unit  10 , which is connected to each other in series, resulting in the collection in the circulation water chamber  11  of the rear cap  8 , and the cooling water collected in the circulation water chamber  11  passes through the cooling water body inlet  12  of the rear cap  8  and through the body cooling water passageway  18  of each unit  10 , resulting in the collection in the discharge water chamber  27  of the front cap  7  and it is discharged through the cooling water outlet  5 . 
     Thus, the hot hydraulic-operating oil passing through the inside of the heat exchange pipe  20  disposed at the inside of the body of the hydraulic-operating oil cooling apparatus  1  in the zigzag movement is cooled by the cooling water passing through the inside of the body of the unit  10  and the inside of the heat exchange pipe  20  by means of the processes as described above. 
     In this instance, as shown in  FIG. 4 , the heat exchange pipe  20  is formed with thread-shaped fins  21  at the outer surface of the heat exchange pipe  20 , the cooling efficiency can be maximized by disposing more and more heat exchange pipes  20  at the inside of the body of the hydraulic-operating oil cooling apparatus  1  because each of the heat exchange pipe  20  is constructed in such a manner that fins thereof overlap with each other. 
     If the packing  23 , which is formed integrally with the clogging plate  24  at the inside of the packing  23  as shown in  FIG. 7 , is engaged at an intermediate portion of the unit  10 , the clogging plate  24  of the packing  23  can be firmly secured to the inside of the hydraulic-operating oil cooling apparatus  1  without the supporting rod  28  as shown in  FIG. 10  and  FIG. 11 . 
       FIG. 12  is an exploded perspective view showing another embodiment of the present invention. 
     In the present embodiment, the hydraulic-operating oil cooling apparatus comprises a body  29  formed integrally with an oil inlet  2  and an oil outlet  3 , and two supporting rods  28  provided with the clogging plates  24  by a predetermined interval, are inserted into a supporting rod engaging hole  30  and the heat exchange pipe engaging opening  19  of the cap clogging plates  9 , which are engaged at both sides of the body  29 , and disposed at the inside of the body  29 . In addition, the hydraulic-operating oil cooling apparatus  1  is constructed by engaging the front cap  7  and the rear cap  8  at both the cap clogging plates  9  of the body  29 . 
     In this instance, an end portion of the heat exchange pipe  20 , which is inserted into the heat exchange pipe engaging opening  19  of the cap clogging plate  9 , is constructed to prevent leakage of the hydraulic-operating oil passing through the periphery of the heat exchange pipe  20  by enlarging the pipe. In addition, as shown in  FIG. 4 , the hydraulic-operating oil passing through the periphery of the heat exchange pipe  20  can be prevented from leakage by using two cap clogging plates  9  and sealing members  16 . 
     Consequently, the technical gist of the present invention can be summarized as follows. 
     According to one embodiment of the present invention, there is provided an assembly type hydraulic-operating oil cooling apparatus, wherein a desired number of units  10  are bolt-engaged with each other in series to form a body of the hydraulic-operating oil cooling apparatus, each unit being formed with engaging holes  13  and body cooling water passageways  18  in the circumferential direction thereof, a packing  23  is inserted into an intermediate portion of each unit  10  in such a manner that projecting portions  31  alternately confront each other, and an oil inlet  2  and an oil outlet  3  are respectively formed at units  10  engaged at both sides of the body. 
     In this embodiment, cap clogging plates  9  are engaged at both sides of the body, and heat exchange pipes  20  and support rods  28  are respectively inserted into heat exchange pipe engaging openings  19  and support rod engaging holes  30 , and the supporting rods  28  are further inserted into support rod holes  25  of a clogging plate  24  attached to the projecting portions  31  of the packing  23 . 
     In addition, in this embodiment, a cooling water inlet  4  and a cooling water outlet  5 , which are separated from each other by a partition  26 , are formed at one side of the cap clogging plate  9 , which is engaged at both sides of the body, and a front cap  7  formed with cooling water body inlets  12  in the radial direction is also engaged at one side of the cap clogging plate, and a rear cap  8  formed with cooling water body inlets  12  in the radial direction is engaged at the other side of the cap clogging plate  9 , which is engaged at both sides of the body. 
     Moreover, according to another embodiment of the present invention, there is provided an assembly type hydraulic-operating oil cooling apparatus, wherein a body  29  is formed with body cooling water passageways  18  in the circumferential direction at the inside thereof, an oil inlet  2  and an oil outlet  3  are respectively formed above the body  29 , and cap clogging plates  9  are engaged at both sides of the body  29  in such a manner that heat exchange pipes  20  and support rods  28  are inserted respectively into heat exchange pipe engaging openings  19  and support rod engaging holes  30 , and the support rods  28  are inserted into support rod holes  25  of clogging plates  24  in such a manner that the clogging plates  24  are fit around the support rods  28  so that they spaced apart from each other at a predetermined interval. 
     In this embodiment, a cooling water inlet  4  and a cooling water outlet  5 , which are separated from each other by a partition  26 , are formed at one side of the cap clogging plate  9 , which is engaged at both sides of the body  29 , and a front cap  7  formed with a cooling water body inlet  12  in the radial direction is also engaged, and a rear cap  8  formed with cooling water body inlets  12  in the radial direction is engaged at the other side of the cap clogging plate  9 , which is engaged at both sides of the body  29 . 
     Furthermore, according to still another embodiment of the present invention, there is provided an assembly type hydraulic-operating oil cooling apparatus, wherein a desired number of units  10  are bolt-engaged with each other in series to form a body of the hydraulic-operating oil cooling apparatus, each unit being formed with engaging holes  13  and body cooling water passageways  18  in the circumferential direction thereof, a packing  23  is inserted into an intermediate portion of each unit  10  so that projecting portions  31  of the packing  23 , which is formed integrally with a clogging plate  24  at the inside, alternatively confront each other, and an oil inlet  2  and an oil outlet  3  are formed at the units  10  engaged at both sides of the body. 
     In this embodiment, cap clogging plates  9  are engaged at both sides of the body in such a manner that heat exchange pipes  20  are inserted into heat exchange pipe engaging openings  19  of the each cap clogging plate  9 , a cooling water inlet  4  and a cooling water outlet  5 , which are separated from each other by a partition  26 , are formed at one side of the cap clogging plate  9 , which is engaged at both sides of the body  29 , and a front cap  7  formed with cooling water body inlets  12  in the radial direction is also engaged, and a rear cap  8  formed with cooling water body inlets  12  in the radial direction is engaged at the other side of the cap clogging plate  9 , which is engaged at both sides of the body  29 . 
     INDUSTRIAL APPLICABILITY 
     As described above, according to the present invention, cooling efficiency is excellent because the cooling water passes through the inside of the heat exchange pipe as well as inside of the body thereof. 
     It is possible to easily disassemble and clean the hydraulic-operating oil cooling apparatus when impurities are concentrated in the interior of the oil cooling apparatus. 
     In addition, the present invention is very useful because it is possible to exchange the damaged parts after disassembling them without a necessity of changing the entire hydraulic-operating oil cooling apparatus, when the parts thereof are damaged. As a result, it is easy and simple to maintain and repair the hydraulic-operating oil cooling apparatus, and easy to assemble it, resulting in the drastic reduction of the manufacturing cost.