JP2010243064A - Cooling system - Google Patents

Abstract

The present invention proposes a cooling device including a strainer that can reduce cleaning work and can avoid sucking air from a coolant supply port of a liquid tank.
A joint pipe 20 defining a coolant supply port 8 protrudes vertically from a bottom surface 2a of a liquid tank 2 of a cooling device 1. A cylindrical elastic ring is provided on an outer peripheral surface 20b of the joint pipe 20. 21 is attached. The strainer 9 includes a cylindrical cylindrical body 31 formed by winding a punching metal, and a lid body 32 that closes the upper end opening 31a of the cylindrical body 31, and the lower end opening 31b of the cylindrical body 31 serving as the connection opening end 33. Is fitted into the joint pipe 20 via the elastic ring 21. Since the strainer 9 is detachable from the liquid tank 2, cleaning work is easy. Further, since the coolant passage hole 30 is not formed in the lid 32, no vortex flows from the liquid surface to the coolant supply port 8 through the strainer 9, and air is sucked from the coolant supply port 8. There is nothing.
[Selection] Figure 3

Description

  The present invention relates to a cooling device that supplies a coolant to an object to be cooled. More specifically, the present invention relates to a cooling device including a strainer that can be easily cleaned at a coolant supply port of a liquid tank that stores coolant.

  The cooling device has a liquid tank for storing a coolant to be circulated with the object to be cooled, a liquid tank for sending the coolant from the liquid tank to the object to be cooled through the coolant outlet and the liquid tank via the coolant inlet. It is equipped with a pressure-feed pump for recovering, a cooler for cooling the coolant, and a pipe connecting them. In the cooling device described in Patent Document 1, the pressure pump is disposed between the coolant supply port and the coolant outlet of the liquid tank, and the cooler is disposed between the pressure pump and the coolant outlet. The cooler cools the cooling liquid sent out from the liquid tank toward the object to be cooled.

  As a cooler of the cooling device, as described in Patent Document 2, a plate heat exchanger or the like is used. In such a cooler, in order to efficiently exchange heat between the coolant and the refrigerant, the coolant is allowed to pass through a narrow gap sandwiched between the plates. Therefore, if foreign matter is mixed in the coolant, the foreign matter may damage the cooler. Moreover, since the flow of the cooling liquid is delayed due to the clogging of foreign matters in the cooler, the load on the pressure pump may increase. In order to avoid these problems, a strainer is disposed on the coolant circulation path to remove foreign matter. For example, Patent Document 3 describes a Y-type strainer that is disposed in the middle of a pipe to remove foreign matter.

JP 2003-329355 A JP-A-9-196512 JP 2008-80189 A

  On the coolant circulation path, foreign substances are most likely to enter the liquid tank whose upper surface is open. For this reason, it is a common practice to remove foreign matter by arranging a strainer at the coolant supply port of the liquid tank. FIG. 8 is a perspective view of a liquid tank of a cooling device in which a strainer is disposed at the cooling liquid supply port, as viewed obliquely from above. The side of the liquid tank is cut away so that the strainer can be seen.

  As shown in FIG. 8, the strainer 101 arrange | positioned in the liquid tank 100 is a box-shaped thing, for example. The upper surface 101 a and the side surface 101 b are provided with a large number of coolant passage holes 102, and the lower surface opening 101 c is fixed so as to be continuous with the coolant supply port 103 formed in the bottom surface 100 a of the liquid tank 100. A flange 101 d that bends outward is formed at the lower end edge of the strainer 101, and the flange 101 d is welded to the bottom surface 100 a of the liquid tank 100.

  Here, since the strainer 101 is fixed to the bottom surface 100a of the liquid tank 100, cleaning thereof is difficult.

  Further, if the strainer 101 is cleaned while attached to the coolant supply port 103, the foreign matter collected and deposited by the strainer 101 is removed from the outside of the strainer 101. It is easy to fall off inside the strainer 101. If the foreign matter falls out to the inside of the strainer 101, the foreign matter may then flow into the cooler or the like from the coolant supply port 103 and cause a failure. For this reason, when cleaning the strainer 101, it is necessary to pay attention so that foreign matter does not fall inside the strainer 101, and the workability of the cleaning has been reduced.

  Further, if the strainer 101 is cleaned while attached to the coolant supply port 103, the inner surface of the strainer 101 covering the coolant supply port 103 cannot be cleaned, so that the foreign matter collected by the strainer 101 is completely removed. Can not be removed. For this reason, there is a problem that the strainer 101 must be frequently cleaned.

  Further, such a box-type strainer 101 is often formed by sheet metal processing, and the dimension in the depth direction of the box that can be formed by bending is limited. For this reason, it is not easy to increase the surface area of the strainer 101 attached within a predetermined installation area, and it is difficult to improve the collection performance of the strainer 101 by reducing the diameter of each coolant passage hole 102. ing. That is, if each coolant passage hole 102 is made smaller, the suction resistance when sucking the coolant is increased and the load of the pump is increased, so that more coolant passage holes 102 are formed on the surface of the strainer 101. Therefore, it is necessary to secure the opening area of the entire coolant passage hole 102. On the other hand, if the strainer 101 is a box shape, the surface area cannot be increased due to processing limitations, and it is difficult to increase the number of cooling liquid passage holes 102 to ensure the entire opening area. The liquid passage hole 102 cannot be made small. As a result, when using the strainer 101, it is necessary to install a Y-type strainer or the like in the middle of the piping to collect foreign matter, and therefore, a plurality of strainers must be cleaned when cleaning. There's a problem. In addition, the Y-type strainer arranged in the middle of the pipe has a problem that it is difficult to clean at an appropriate timing because the stain condition cannot be confirmed from the appearance.

  Further, the strainer 101 mainly sucks the coolant from the coolant passage hole 102 on the upper surface 101a. For this reason, depending on the amount of the coolant stored in the liquid tank 100 and the amount of the coolant circulated by the pressure feed pump, when the coolant is sucked into the coolant supply port 103, the liquid level is passed through the strainer 101. A vortex flow toward the coolant supply port 103 may be formed. In this case, since air is sucked from the coolant supply port 103, there is a problem that the suction force of the pump is reduced.

  The subject of this invention is providing a cooling device provided with the strainer which can reduce a cleaning operation | work in view of such a point.

  Moreover, the subject of this invention is providing a cooling device provided with the strainer which can avoid taking in air from the cooling fluid supply port of a liquid tank.

In order to solve the above-described problem, the cooling device of the present invention includes:
A liquid tank for storing the cooling liquid;
A coolant supply port opened in the inner peripheral surface of the liquid tank;
A strainer detachably attached to the coolant supply port,
The strainer is characterized in that a large number of coolant passage holes are formed in an outer peripheral surface portion that cannot be seen from directly above.

  According to this invention, since the strainer is arrange | positioned in the liquid tank, the stain | pollution | contamination condition of a strainer can be confirmed visually. Therefore, the strainer can be cleaned at an appropriate timing. In addition, when foreign matter is collected in the strainer, the strainer can be removed from the coolant supply port and cleaned. Since it is not necessary to clean the strainer while it is attached to the bottom surface of the liquid tank, the cleaning work is reduced. Further, since the strainer can be removed from the liquid tank and cleaned, there is no need to worry about the foreign matter that has fallen off from the strainer entering the cooling liquid supply port during cleaning, and the cleaning workability is good. Furthermore, if the strainer is removed from the coolant supply port and cleaned, foreign matter adhering to the inner surface of the strainer covering the coolant supply port can also be removed. As a result, the frequency of cleaning the strainer can be reduced.

  Furthermore, since the coolant passage hole is formed on the outer peripheral surface portion that cannot be seen from directly above the strainer, when the coolant is sucked into the coolant supply port, the coolant passage hole passes through the strainer coolant passage hole. It is possible to prevent the formation of vortex flow toward the coolant supply port. Therefore, it can be avoided that air is sucked from the coolant supply port and the suction force of the pressure pump is reduced.

  In the present invention, the strainer includes a cylindrical body formed from a plate material, and a blocking plate that seals one opening end of the cylindrical body, and the other opening end of the cylindrical body is It is desirable that the connection opening end is inserted and fixed in a detachable state with respect to the coolant supply port. If the cylindrical body of the strainer is formed by winding a plate material, the processing is easy and there is no processing limitation. As a result, when each coolant passage hole is made smaller, the cylindrical body can be enlarged to increase the number of coolant passage holes, and the opening area of the entire coolant passage hole can be secured. Ability can be improved. Here, if the collection capability of the strainer provided in the liquid tank is improved, the strainer disposed in the middle of the piping can be omitted and the strainer can be integrated into one, so that the strainer cleaning work is reduced. Furthermore, since the strainer is easy to process, when forming the coolant passage holes only on the outer peripheral surface portion that cannot be seen from above in the vertical direction, the cylindrical body is enlarged to increase the number of coolant passage holes. The opening area of the entire passage hole can be ensured. Therefore, even when the generation of the vortex is prevented, it is not hindered that the diameter of the coolant passage hole is reduced to improve the collection ability of the strainer. Further, if the other opening end of the strainer is used as a connection opening end and is inserted and fixed to the coolant supply port, the strainer can be easily attached and detached during cleaning.

  In the present invention, the coolant supply port is defined by a joint pipe protruding into the liquid tank from the inner peripheral surface of the liquid tank, and the connection opening end of the cylindrical body is formed of an elastic ring. It is desirable to be inserted and fixed to the joint pipe. If it does in this way, the opening end for connection of a strainer should just be inserted and fixed with respect to a joint pipe, and its attachment or detachment becomes easy.

  In the present invention, the cooling liquid supply port is formed on the bottom surface of the liquid tank, the cylindrical body is a cylinder formed of a porous plate, and the joint pipe is perpendicular to the bottom surface. The elastic ring is attached to the outer peripheral surface of the joint pipe, and the outer peripheral surface portion in which the coolant passage hole is formed by the cylindrical body can be defined. .

  According to this invention, since the strainer is arrange | positioned in the liquid tank, the stain | pollution | contamination condition of a strainer can be confirmed visually. Therefore, the strainer can be cleaned at an appropriate timing. In addition, when foreign matter is collected in the strainer, the strainer can be removed from the coolant supply port and cleaned. Since it is not necessary to clean the strainer while it is attached to the bottom surface of the liquid tank, the cleaning work is reduced. Further, since the strainer can be removed from the liquid tank and cleaned, there is no need to worry about the foreign matter that has fallen off from the strainer entering the cooling liquid supply port during cleaning, and the cleaning workability is good. Furthermore, if the strainer is removed from the coolant supply port and cleaned, foreign matter adhering to the inner surface of the strainer covering the coolant supply port can also be removed. As a result, the frequency of cleaning the strainer can be reduced.

  Furthermore, according to the present invention, since the coolant passage hole is formed in the outer peripheral surface portion that cannot be seen from directly above the strainer, when the coolant is sucked into the coolant supply port, the strainer is cooled from the liquid surface. It is possible to prevent a vortex flowing toward the coolant supply port from being formed through the liquid passage hole. Therefore, it can be avoided that air is sucked from the coolant supply port and the suction force of the pressure pump is reduced.

It is a circuit block diagram of a cooling device. It is the perspective view of the liquid tank shown by notching a side part so that a strainer can be seen. It is the disassembled perspective view which removed the elastic ring and the strainer from the bottom face of the liquid tank. (A) is a perspective view which shows the example which made the shape of the strainer the truncated cone shape, (b) is the perspective view which shows the example which made the shape of the strainer the quadrangular prism shape. It is the disassembled perspective view which removed the elastic ring and the strainer from the side surface of the liquid tank in the configuration example in which the coolant supply port is defined on the side surface of the liquid tank. It is a disassembled perspective view which removes and shows a strainer and an elastic ring from the bottom face of a liquid tank in the example of composition using an L-shaped joint pipe. It is the disassembled perspective view which removed the strainer and the elastic ring from the bottom face of the liquid tank in the structural example using an L-shaped elastic ring. It is the perspective view of the liquid tank shown by notching a side part so that a strainer can be seen in the conventional cooling device.

  Embodiments of a cooling device to which the present invention is applied will be described below with reference to the drawings.

(Circuit configuration)
FIG. 1 is a circuit configuration diagram of the cooling device. The cooling device 1 of this example supplies a coolant to an object to be cooled such as a machine tool. The cooling device 1 stores a liquid tank 2 for storing a coolant to be circulated between the cooling device 1 and the object to be cooled, and sends the coolant from the liquid tank 2 to the object to be cooled through the coolant outlet 3. At the same time, a pressure-feed pump 5 for collecting in the liquid tank 2 through the coolant inlet 4 and a pipe 6 and a bypass valve 7 for connecting them are mounted.

  The pump 5 is disposed between the coolant supply port 8 and the coolant outlet 3 of the liquid tank 2, and a strainer 9 is attached to the coolant supply port 8. A refrigeration cycle 10 is mounted between the pressure feed pump 5 and the coolant outlet 3 for cooling the coolant sent toward the object to be cooled. An overflow pipe 11 and a drain pipe 12 are connected to the liquid tank 2. The downstream end of the overflow pipe 11 and the downstream end of the drain pipe 12 are both connected to a coolant discharge pipe 13, and the downstream end of the coolant discharge pipe 13 is installed outside the cooling device 1 (not shown). Connected to the drain tank.

  The overflow pipe 11 is for discharging excess coolant. When the amount of the coolant in the liquid tank 2 exceeds the upper limit of the appropriate liquid amount for some reason, the liquid level of the coolant rises from the overflow port 11a formed in the liquid tank 2. Therefore, excess coolant flows into the overflow pipe 11 from the overflow port 11 a and is discharged through the overflow pipe 11 and the coolant discharge pipe 13. As a result, the amount of cooling liquid in the liquid tank 2 is kept below the upper limit.

  The drain pipe 12 is for discharging the cooling liquid from the liquid tank 2 at the time of cleaning or the like. The drain pipe 12 is provided with a drain valve 14, and when the drain valve 14 is opened, the coolant in the liquid tank 2 is discharged from the drain port 12 a formed in the liquid tank 2 and the coolant. It is discharged through the tube 13.

  The refrigeration cycle 10 includes a compressor 15 that compresses and circulates refrigerant, a condenser 16 that functions as an exhaust heat unit that lowers the temperature of the high-temperature and high-pressure refrigerant discharged from the compressor 15, and a condensed refrigerant. And a cooler 18 that cools the coolant by exchanging heat between the refrigerant and the coolant. The condenser 16 is provided with a blower fan 19 for air-cooling the condenser 16. As the cooler 18, a plate heat exchanger is used.

(Composition of liquid tank and strainer)
FIG. 2 is a perspective view of the liquid tank taken out from the cooling device and viewed obliquely from above. The side surface portion of the liquid tank is cut away so that the strainer arranged at the cooling liquid supply port can be seen. FIG. 3 is an exploded perspective view in which the strainer and the elastic ring are removed from the bottom surface of the liquid tank.

  As shown in FIG. 2, the liquid tank 2 is made of stainless steel and has a rectangular parallelepiped shape. A joint pipe 20 that defines the coolant supply port 8 projects vertically from the bottom surface 2 a of the liquid tank 2. A columnar strainer 9 extending vertically is detachably attached to the outer peripheral side of the joint pipe 20 via an elastic ring 21. A pipe joint pipe 22 for connecting a pipe 6 extending from the coolant supply port 8 to the coolant outlet 3 via the pressure feed pump 5 and the cooler 18 is connected to the coolant supply port 8 outside the liquid tank 2. Is connected. Further, a drain port 12 a is formed on the bottom surface 2 a of the liquid tank 2. A pipe joint pipe 23 for connecting the drain pipe 12 is connected to the drain port 12 a outside the liquid tank 2.

  On one side surface 2b extending in the longitudinal direction of the liquid tank 2, an overflow port 11a and a cooling liquid discharge port 24 are formed. An L-shaped pipe joint pipe 25 for connecting the overflow pipe 11 is connected to the overflow port 11 a outside the liquid tank 2. An L-shaped pipe joint pipe 26 for connecting a pipe 6 extending from the coolant inlet 4 is connected to the coolant discharge port 24 outside the liquid tank 2.

  As shown in FIG. 3, the joint pipe 20 is made of stainless steel and has a cylindrical shape. The joint pipe 20 has a lower end opening edge 20 a welded to an edge of the opening 8 a of the coolant supply port 8 in the liquid tank 2.

  The elastic ring 21 is made of nitrile rubber (NBR) having high wear resistance. The elastic ring 21 is adapted to be fitted into the outer peripheral surface 20b of the joint pipe 20, and in order from the lower end side, the large-diameter first annular portion 21a and the second annular portion having a smaller diameter than the first annular portion 21a. An annular portion 21b, a third annular portion 21c having a smaller diameter than the second annular portion 21b, and a fourth annular portion 21d having the same diameter as the second annular portion 21b are provided. The inner diameters of the annular portions 21 a to 21 d are the same, and are substantially the same as the outer diameter of the joint pipe 20. The height of the elastic ring 21 is almost the same as that of the joint pipe 20.

  The strainer 9 is made of stainless steel, and includes a cylindrical body 31 in which a coolant passage hole 30 is formed and a lid body 32 that seals the upper end opening 31 a of the cylindrical body 31. The lower end opening 31 b of the cylindrical body 31 is a connection opening end 33 that is inserted and fixed in a removable state with respect to the joint pipe 20.

  The cylindrical body 31 is formed by winding a punching metal in which a coolant passage hole 30 having an opening diameter of about 1 mm is formed on the entire surface. The inner diameter of the cylindrical body 31 is substantially the same as the outer diameter of the second annular portion 21 b and the fourth annular portion 21 d of the elastic ring 21, and the outer diameter of the cylindrical body 31 is that of the elastic ring 21. It is smaller than the outer diameter of the first annular portion 21a. The lid 32 includes a circular sealing plate 32a corresponding to the upper end opening 31a of the cylindrical body 31, and an outer peripheral plate 32b having a fixed height protruding from the periphery of the sealing plate 32a toward the cylindrical body 31. Thus, the outer peripheral plate 32b covers the tubular body 31 from above so as to cover the edge of the upper end opening 31a of the tubular body 31 from the outside. The inner peripheral surface of the outer peripheral plate 32 b is bonded to the edge of the upper end opening 31 a of the cylindrical body 31. The outer peripheral surface portion of the strainer 9 in which the coolant passage hole 30 is formed is defined by the cylindrical body 31, and the coolant passage hole 30 is not formed in the lid 32.

  The strainer 9 is attached to the joint pipe 20 through the elastic ring 21 by fitting the connection opening end 33 to the outer periphery of the elastic ring 21. In a state where the strainer 9 is fitted in the elastic ring 21, the connection opening end 33 abuts on the upper end surface of the first annular portion 21a. Further, the inner peripheral surface portion on the lower end side of the cylindrical body 31 is in pressure contact with the outer peripheral surfaces of the second annular portion 21b and the fourth annular portion 21d. Thereby, the strainer 9 is fixed so as to cover the coolant supply port 8. Here, since the coolant passage hole 30 is not formed in the blocking plate 32 a, the coolant passage hole 30 is located on the outer peripheral surface portion of the strainer 9 that cannot be seen from above in the vertical direction.

(Cleaning of liquid tank and strainer)
When cleaning the liquid tank 2 and the strainer 9, first, the drain valve 14 is opened, and the bottom surface 2a and the side surface 2b of the liquid tank 2 are scrubbed while discharging the cooling liquid in the liquid tank 2 from the drain port 12a. Alternatively, the bottom surface 2a and the side surface 2b of the liquid tank 2 are scrubbed after the cooling liquid is discharged from the drain port 12a. Next, it is confirmed that no coolant or cleaning sewage remains in the liquid tank 2. If there is no residual liquid, the strainer 9 is removed from the coolant supply port 8 and taken out of the liquid tank 2. After that, the strainer 9 is cleaned.

  If the liquid tank 2 and the strainer 9 are cleaned in such a procedure, the strainer 9 covers the coolant supply port 8 until the cleaning of the liquid tank 2 is completed. Accordingly, foreign matters and dirt can be prevented from entering the pressure feed pump 5 and the cooler 18 from the pipe 6 through the coolant supply port 8 during cleaning.

(Effects of this embodiment)
According to this form, since the strainer 9 is arrange | positioned in the liquid tank 2, a dirt condition can be confirmed visually. Therefore, the strainer 9 can be cleaned at an appropriate timing. Further, since the strainer 9 is detachably attached to the joint pipe 20 that defines the coolant supply port 8, when it is confirmed that foreign matter is collected in the strainer 9, the strainer 9 is It can be removed from the supply port 8 and cleaned. Since it is not necessary to clean the strainer 9 while it is attached to the bottom surface 2a of the liquid tank 2, the cleaning work is reduced. Furthermore, since the strainer 9 can be attached / detached by inserting / removing the joint pipe 20, the attaching / detaching work of the strainer 9 performed during cleaning is also easy.

  Moreover, according to this form, the strainer 9 can be removed from the liquid tank 2 and cleaned. As a result, since it is not necessary to worry that the foreign matter dropped from the strainer 9 enters the coolant supply port 8 during cleaning, the cleaning workability is good. That is, if the strainer 9 is cleaned while attached to the coolant supply port 8, the foreign matter collected and deposited by the strainer 9 is removed from the outside of the strainer 9. Is easy to fall off inside the strainer 9. And if a foreign material falls out to the inner side of the strainer 9, this foreign material may flow into the pumping pump 5 and the cooler 18 from the cooling liquid supply port 8 after that, and may cause a failure. For this reason, if the strainer 9 cannot be removed from the coolant supply port 8 and taken out of the liquid tank 2, care must be taken not to drop foreign matter inside the strainer 9 when cleaning the strainer 9. And the workability of cleaning is reduced. On the other hand, in this embodiment, since the strainer 9 can be removed from the liquid tank 2 and cleaned, it is not necessary to pay such attention and the workability of cleaning is good.

  Furthermore, according to this embodiment, the inner surface of the strainer 9 can be cleaned from the connection opening end 33 by removing the strainer 9 from the liquid tank 2. As a result, since the foreign matter collected by the strainer 9 can be completely removed, the frequency of cleaning the strainer 9 can be reduced.

  In addition, according to the present embodiment, the coolant passage hole 30 is formed on the outer peripheral surface of the cylindrical body 31, and the coolant passage hole 30 is located on the outer peripheral surface portion that cannot be seen from above in the vertical direction of the strainer 9. Yes. As a result, when the cooling liquid is sucked into the cooling liquid supply port 8, it is possible to prevent a vortex flow from the liquid level toward the cooling liquid supply port 8 through the cooling liquid passage hole 30 of the strainer 9. Therefore, it can be avoided that air is sucked from the coolant supply port 8 and the suction force of the pressure pump 5 is reduced.

  Furthermore, according to the present embodiment, the cylindrical body 31 of the strainer 9 is formed by winding a porous plate such as punching metal, so that the processing is easy and there are no processing limitations. Thereby, when each coolant passage hole 30 is reduced, the cylindrical body 31 is enlarged to increase the number of coolant passage holes 30 and the entire opening area of the coolant passage hole 30 can be secured. The collection ability can be improved. For example, the opening diameter of the coolant passage hole 102 of the conventional box-type strainer 101 shown in FIG. 8 is about 3 mm, but in this embodiment, it can be reduced to about 1 mm. Here, if the collection capability of the strainer 9 provided in the liquid tank 2 is improved, there is no need to separately arrange a strainer in the middle of the pipe, and the strainer can be made one. Therefore, the strainer cleaning work is reduced.

  Further, according to the present embodiment, since it is easy to enlarge the cylindrical body 31 of the strainer 9, when forming the coolant passage hole 30 only on the surface of the cylindrical body 31 that cannot be seen from above in the vertical direction, It is easy to increase the number of the coolant passage holes 30 by enlarging the cylindrical body 31, and to secure the opening area of the entire coolant passage hole 30. Therefore, even when the generation of vortex is prevented, it is not impeded that the diameter of the coolant passage hole 30 is reduced to improve the collection ability of the strainer 9.

  Furthermore, if each annular portion 21a to 21d of the elastic ring 21 is thickened in the radial direction to increase the outer diameter, the inner diameter of the cylindrical body 31 of the strainer 9 fitted to the outer peripheral side of the elastic ring 21 is increased. Thus, the surface area of the cylindrical body 31 can be increased. In this way, the number of the coolant passage holes 30 is increased, and the opening area of the coolant passage holes 30 as a whole can be easily secured. Therefore, the diameter of each coolant passage hole 30 is reduced and the strainer 9 is collected. It becomes easy to improve ability.

  In the above embodiment, the region where the coolant passage hole 30 is formed is the entire surface of the cylindrical body 31. However, if the entire opening area of the coolant passage hole 30 can be secured, the coolant The region where the passage hole 30 is formed may be only a part of the outer peripheral surface of the cylindrical body 31. In this way, the coolant can be sucked into the coolant supply port 8 from a desired direction, so that the flow of the coolant sucked into the coolant supply port 8 in the liquid tank 2 can be controlled.

  Further, in the above embodiment, the cylindrical body 31 is formed from punching metal, but it can also be formed by forming a mesh plate, a wire mesh, or the like into a cylindrical shape.

(Strainer shape modification)
Here, the shape of the strainer is not limited to the cylindrical shape, and the same effect as the above-described embodiment can be obtained even when the shape is a truncated cone, a polygonal column, or the like. FIG. 4 is a perspective view showing a modification of the shape of the strainer.

  A strainer 9A shown in FIG. 4 (a) has a truncated cone shape and includes a truncated cone-shaped cylindrical body 31A and a lid body 32A that closes a large-diameter circular opening at the upper end of the cylindrical body 31A. The small-diameter circular opening at the lower end of the cylindrical body 31A is a connection opening end 33A. The cylindrical body 31A is formed by winding a fan-shaped punching metal, and the coolant passage hole 30 is not formed in the lid body 32A.

  In this way, the surface area of the cylindrical body 31 can be increased without changing the dimensions of the elastic ring 21. Further, since the surface area of the cylindrical body 31 can be increased, the opening area of the entire coolant passage hole 30 can be secured even when the output of the pressure pump 5 is increased to increase the circulation amount of the cooling water, It can be avoided that the load of the pressure pump 5 increases more than necessary. Furthermore, since the opening area formed in the upper region of the strainer 9A close to the liquid surface is larger than the opening area formed in the lower region, the upper area of the strainer 9A close to the liquid surface The flow rate of the coolant sucked into the coolant supply port 8 through the formed coolant passage hole 30 can be reduced. Therefore, the generation of vortex can be suppressed.

  The strainer 9B shown in FIG. 4B has a quadrangular prism shape and includes a rectangular frame-shaped cylindrical body 31B and a lid body 32B that closes the rectangular opening at the upper end, and a rectangular shape at the lower end of the cylindrical body 31B. The opening is a connection opening end 33B. The cylindrical body 31B is formed by bending a rectangular punching metal into a cylindrical shape, and the coolant passage hole 30 is not formed on the lid body 32B side. When this strainer 9B is used, the planar shape of the outer periphery of each of the annular portions 21a to 21d of the elastic ring 21 attached to the joint pipe 20 should be a quadrangle that fits with the connection opening end 33B. preferable.

  In this way, since the cross-sectional shape of the strainer 9B is rectangular while the cross-sectional shape of the coolant supply port 8 is circular, the flow of the coolant sucked into the strainer 9B on the outer peripheral surface of the cylindrical body 31B is It becomes non-uniform | heterogenous and it is suppressed that the strong flow toward the opening 8a of the bottom face 2a of the liquid tank 2 is formed. Therefore, the generation of vortex can be suppressed.

(Configuration example when the coolant supply port is defined on the side of the liquid tank)
FIG. 5 is an exploded perspective view in which the elastic ring and the strainer are removed from the side surface of the liquid tank 2 in the configuration example in which the coolant supply port is defined on the side surface of the liquid tank 2. Since the present embodiment has the same configuration as that of the above embodiment, the same reference numerals are given to the corresponding portions, and the description thereof is omitted.

  In this embodiment, as shown in FIG. 5, the joint pipe 20 that defines the coolant supply port 8 protrudes from the side surface 2 b of the liquid tank 2 in the horizontal direction. An elastic ring 21 is fitted into the joint pipe 20 so as to cover the outer peripheral surface 20b. Although the strainer 9 </ b> C has a cylindrical shape like the strainer 9, the coolant passage hole 30 is not formed on the entire surface of the cylindrical body 31. The coolant passage hole 30 of the strainer 9 </ b> C is formed in one side of the cylindrical body 31 with the axis L interposed therebetween and on the sealing plate 32 a of the lid body 32.

  When attaching the strainer 9 </ b> C to the joint pipe 20, the strainer 9 </ b> C is fitted into the elastic ring 21 such that the outer peripheral surface portion where the coolant passage hole 30 is formed in the cylindrical body 31 faces downward. As a result, the coolant passage hole 30 becomes invisible from directly above in the vertical direction.

  Also according to this embodiment, the same effect as the above embodiment can be obtained.

(Other embodiments)
FIG. 6 is an exploded perspective view showing the strainer and the elastic ring removed from the bottom surface of the liquid tank 2 in the configuration example using the L-shaped joint pipe.

  In the above embodiment, the coolant supply port 8 is defined by the joint pipe 20 that extends straight in any of the examples. For example, as shown in FIG. 6, a vertical joint pipe portion 20c that extends in the vertical direction, The coolant supply port 8 may be defined by an L-shaped joint pipe 20A having a horizontal joint pipe part 20d that extends horizontally along the bottom surface 2a continuously from the upper end side of the vertical joint pipe part 20c.

  In this case, the elastic ring 21 is fitted so as to cover the outer peripheral surface 20e of the horizontal joint pipe portion 20d. As the strainer, a strainer 9C formed on one side of the cylindrical body 31 with the coolant passage hole 30 sandwiching the axis and the sealing plate 32a of the lid body 32 is used. The strainer 9 </ b> C is fitted into the elastic ring 21 so that the outer peripheral surface portion on which 30 is formed faces downward. Even if it does in this way, the effect similar to said form can be acquired.

  Next, instead of the elastic ring 21 of the above embodiment, an L-shaped elastic ring can be used. FIG. 7 is an exploded perspective view in which the strainer and the elastic ring are removed from the side surface of the liquid tank 2 in the configuration example using the L-shaped elastic ring.

  In this case, for example, as shown in FIG. 7, an outer peripheral surface 20 b of the joint pipe 20 with respect to the joint pipe 20 extending vertically from the bottom surface 2 a of the liquid tank 2 and defining the coolant supply port 8. An elastic ring 21A including a vertical cylindrical portion 21e to be fitted and a horizontal cylindrical portion 21f extending horizontally along the bottom surface 2a from the upper end of the vertical cylindrical portion 21e is attached. The first to fourth annular portions 21a to 21d are provided in the horizontal cylindrical portion 21f of the elastic ring 21A. As the strainer 9, a strainer 9 </ b> C formed on one side of the cylindrical body 31 with the coolant passage hole 30 sandwiching the axis and the sealing plate 32 a of the lid body 32 is used. The strainer 9C is fitted into the elastic ring 21A so that the outer peripheral surface portion where the hole 30 is formed faces downward. Even if it does in this way, the effect similar to said form can be acquired.

1 Cooling device 2, 100 Liquid tank 2a, 100a Liquid tank bottom surface 2b Liquid tank side surface 3 Cooling liquid outlet 4 Cooling liquid inlet 5 Pressure feed pump 6 Pipe 7 Bypass valve 8 Cooling liquid supply ports 9, 9A, 9B, 9C, 9D , 101 Strainer 10 Refrigeration cycle 11 Overflow pipe 11a Overflow port 12 Drain pipe 12a Drain port 13 Coolant discharge pipe 14 Drain valve 15 Compressor 16 Condenser 17 Expansion valve 18 Cooler 19 Blower fan 20, 20A, 20B Joint pipe 21, 21A Elastic ring 21a-21d Ring-shaped part 22, 23, 25, 26 Pipe joint pipe 24 Cooling liquid discharge port 30, 102 Cooling liquid passage hole 31, 31A, 31B Cylindrical body 32, 32A, 32B Cover body 32a Sealing Plate 33, 33A, 33B Open end for connection

Claims (4)

A liquid tank for storing the cooling liquid;
A coolant supply port opened in the inner peripheral surface of the liquid tank;
A strainer detachably attached to the coolant supply port,
The strainer has a large number of coolant passage holes formed in an outer peripheral surface portion that cannot be seen from directly above. The cooling device according to claim 1, wherein
The strainer includes a cylindrical body formed from a plate material, and a blocking plate that seals one open end of the cylindrical body,
The other opening end of the cylindrical body is a connection opening end that is inserted and fixed in a removable state with respect to the coolant supply port. The cooling device according to claim 2, wherein
The coolant supply port is defined by a joint pipe protruding into the liquid tank from the inner peripheral surface of the liquid tank,
The cooling device according to claim 1, wherein the connection opening end of the cylindrical body is inserted and fixed to the joint pipe via an elastic ring. The cooling device according to claim 3, wherein
The cooling liquid supply port is formed on the bottom surface of the liquid tank,
The cylindrical body is a cylinder formed from a porous plate,
The joint pipe projects vertically from the bottom surface;
The elastic ring is attached to the outer peripheral surface of the joint pipe,
An outer peripheral surface portion in which the coolant passage hole is formed by the cylindrical body is defined.

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