JPH0829047A - Liquid cooling device - Google Patents

Abstract

PURPOSE:To improve the cooling efficiency of a condenser and reduce the area of installation of the liquid cooling device by a method wherein an air passage for cooling the condenser forcibly by air is formed of a partitioning plate while an evaporator is arranged at the lower side of the condenser. CONSTITUTION:An air passage 104 having no obstacle is formed in a casing body by a partitioning plate 44 and air, sucked through a condenser 2, is deflected smoothly and upwardly by the partitioning plate 44 whereby air resistance is reduced and the cooling efficiency of the condenser 2 is improved. On the other hand, other refrigerant instruments, such as an evaporator 3 and the like, will never be heated by high-temperature air after passing through the condenser 2. Further, the evaporator 3 is arranged along the lower part of the condenser 2 and the liquid inlet pipe 25 is projected out of the right side surface of the casing body whereby a liquid pipeline can be arranged in a space for sucking air before the condenser 2. Furthermore, the evaporator 3 is arranged utilizing a dead space below the condenser 2 whereby the width of the casing body can be constituted so as to be smaller and the condenser 2 can be arranged so as to the contacted closely with a wall surface or the like thereby permitting the reduction of the area of installation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid cooling device such as a machining liquid cooling device of an electric discharge machine equipped with a variable speed controlled compressor, an evaporator, a condenser, a fan and the like.

[0002]

2. Description of the Related Art As is well known, an electric discharge machine performs electric discharge between an electrode and a workpiece placed in a machining fluid of water or oil to perform machining. The temperature of the machining fluid rises as the machining time elapses due to the heat of the turbine pump that circulates the energy and machining fluid at high pressure during the electric discharge machining. Then
The temperature of the work piece in the working liquid also rises and thermal expansion occurs. Since the main body of the electric discharge machine adapts to the room temperature of the room in which it is installed and thermally expands, if the temperature of the machining liquid rises above the room temperature, the machining accuracy is greatly reduced due to the temperature difference. As a countermeasure against this, a working fluid cooling device capable of varying the cooling ability of the working fluid in a wide range is controlled so that the working fluid has the same temperature as room temperature.

As a conventional example of the working fluid cooling device as described above, for example, there is a technique disclosed in Japanese Utility Model Laid-Open No. 1-97187. As shown in FIG. 9, this conventional working liquid cooling apparatus is for forced air cooling of a condenser 2 in which a compressor 1 and an evaporator 3 with mounting legs are provided on a side surface inside a casing. It forms an air passage. One wall surface of the air passage is formed by a case 60 having a hat-shaped cross section, a ventilation duct 201 whose upper and lower ends communicate with the inside of the housing is provided on the back surface of the case 60, and a square hole 60h is formed in the case 60. The variable speed control device 7 is attached to the inside of the ventilation duct 201 by penetrating through and the forced air cooling of the variable speed control device 7 is performed. The evaporator 3 is of a shell-and-tube type, and the compressor 1 is mounted on a pedestal that is arranged on the opposite side of the condenser 2 and that surrounds the evaporator 3. In addition, the electromagnetic contactor housed in the case 60
(Not shown) and the lead wire of the fan 4 are connected.

[0004]

In the conventional liquid cooling device, since the entire inside of the casing forms the air passage for the forced air cooling of the condenser 2, the air resistance is large and the cooling efficiency of the condenser 2 is large. Was not good. Further, since the evaporator 3 is arranged on the opposite side of the condenser 2, the inside of the housing has not been effectively used. Further, since the cutout portion for ventilation at the upper end of the ventilation duct 201 is close to the fan 4, if the machining fluid accidentally enters from the fan exhaust port on the top surface of the top plate due to a pipe crack of the machining fluid or the like, The machining liquid may be scattered at high speed by the rotation of the fan 4 and may enter the case 60 to cause an electric short circuit accident.

Further, the shell-and-tube type evaporator 3 has a plurality of baffles for causing the working fluid to meander, and the notch portions of the baffle plates are alternately located on the upper and lower sides, so that the working fluid is immersed in the working fluid. The contained processing sludge was liable to be accumulated, and the cooling capacity was sometimes deteriorated. Further, the fan 4 is attached from the lower surface of the upper plate of the housing, and the evaporator 3 is attached in the pedestal, so that the assembling workability is not good. In addition, there is a problem in that an electromagnetic interference is generated from the wiring path of the lead wire of the fan 4 and the wiring between the electromagnetic contactor and the electronic circuit or the like malfunctions.

The present invention has been made to solve the above problems, and a first object of the present invention is to improve the cooling efficiency of a condenser by forming an air passage having a small air resistance of the condenser. The purpose is to reduce the installation area of the liquid cooling device by effectively utilizing the inside of the housing.

A second object is to prevent the machining liquid from entering the case even if the machining liquid enters from the fan exhaust port.

A third object of the present invention is to improve the workability by mounting the fan and reducing the mounting work while supporting the fan.

A fourth object is to reduce the accumulation of working sludge contained in the working fluid due to the baffle plate of the evaporator.

[0010]

A liquid cooling device according to a first aspect of the present invention is provided with a side plate and a condenser forming a side wall portion of a casing, and a top plate forming the casing. And a partition plate that is disposed inside the housing and that slopes from the lower part of the condenser toward the upper part of the side plate to form an air passage partition with the top plate. And a compressor disposed in a cooling device section formed between the partition plate and a bottom plate constituting the casing, and a compressor disposed below the condenser and facing the compressor. And an evaporator forming a circulation path of the refrigerant from the condenser to the compressor.

In the liquid cooling device according to the second aspect of the present invention, a case attached to the housing and a vent hole are formed in the case at a position on the negative pressure side with respect to the rotation direction of the fan. It is characterized in that a deflecting plate that covers a part is provided.

A liquid cooling device according to a third aspect of the present invention comprises a top plate which constitutes a casing, and an axial fan having a plurality of mounting legs for discharging the air in the casing. A first hole through which the axial fan can penetrate and a slit-shaped second hole through which the mounting foot can penetrate are formed, and the fan and the mounting foot are respectively formed from the top surface side of the top plate to the first side.
Also, the mounting foot of the fan is fixed to the upper surface of the top plate by being inserted into the second hole.

In the liquid cooling device according to the fourth aspect of the present invention, the partition plate forms a vertical portion extending vertically upward in parallel with the side plate,
A gap is provided between the side plate and the vertical portion of the partition plate.

In the liquid cooling device according to the fifth aspect of the invention, the evaporator is a shell-and-tube type, and one side is horizontally positioned inside the shell and the refrigerant cooling pipe with fins arranged in a triangle is passed therethrough. And a plurality of plate-shaped baffle plates arranged at a predetermined interval, the baffle plate is formed by cutting out a part of a circle contacting the inner wall of the shell, and the baffle plate is cut. The notched edge is arranged parallel to one side of the hypotenuse of the triangle, and is alternately arranged so as to face the notched edge of the adjacent baffle plate.

[0015]

According to the liquid cooling device of the first aspect of the invention, since the partition plate forms the air passage for forcedly cooling the condenser, the air resistance is small and the cooling efficiency of the condenser is improved. Since the evaporator is disposed on the lower side of the condenser, the liquid cooling device can be downsized, and the liquid pipe of the evaporator can be formed in the intake space of the condenser, and the installation area of the liquid cooling device can be reduced.

According to the liquid cooling device of the second invention,
Forced ventilation is performed by the suction force of the fan, and the ventilation hole of the case is located on the negative pressure side with respect to the rotation direction of the fan. Therefore, the suction force is large and intrusion due to accidental diffusion of scattered water is prevented.

According to the liquid cooling device of the third invention,
Since the housing top plate is provided with slit-shaped holes, the fan can be inserted into the air passage section from the outside of the housing and attached.

According to the liquid cooling device of the fourth invention,
Since a gap is formed between the vertical portion of the upper part of the partition plate and the side plate, air is drawn from the refrigerant device section into the air passage section through the gap, the temperature rise in the refrigerant apparatus section is reduced, and the wind Intrusion of splashed water from the passage into the refrigerant equipment compartment is restricted.

According to the liquid cooling device of the fifth invention,
The notched circular portions of the baffle plate are arranged so that the adjacent circular portions of the baffle plate are alternately arranged obliquely downward and obliquely upward with respect to the center of the cylindrical body. A liquid flow having a high flow velocity is formed in the bottom portion by the notch portion, and the sludge is discharged well.

[0020]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to FIGS. 1 is an overall perspective view of an embodiment of the liquid cooling device according to the present invention, FIG. 2 is a front view of the liquid cooling device according to FIG. 1 with a front cover removed, and FIG. 3 is a back cover of the liquid cooling device according to FIG. 4 is a partially cutaway top view of the liquid cooling device according to FIG. 1 with the air hole cover removed, FIG. 5 is a sectional view taken along the line AA of FIG. 2, and FIG. 6 is according to FIG. FIG. 7 is a partially cutaway left side view showing the evaporator of the liquid cooling device, FIG. 7 is a sectional view taken along line BB of FIG. 6, and FIG. 8 is a front view of a baffle plate of the evaporator according to FIG. 1 to 8, reference numeral 101 denotes the entire liquid cooling device, which includes a refrigerant device section 102 and an electric section 103 located on the front side thereof. Reference numeral 41 is a housing of the refrigerant device section 102. Reference numeral 42 denotes a bottom plate which has four sides bent upward and also serves as a drain pan for the housing 41, and a drain pipe 51 is welded to the left side surface thereof as shown in FIG. Further, the mounting feet 52 are fixed to the four corners. 43
Is a front plate having a left side leg 43A and a right side leg 43B. Reference numeral 44 denotes an inclined partition plate (see FIG. 3), which is a vertical falling leg 44A which is a vertical portion fixed to the left side surface of the bottom plate 42.
A horizontal portion 44B extending inward from the upper end of the vertical falling leg 44A, an inclined portion 44C extending from the horizontal portion 44B to the upper right side surface of the housing 41, and a vertical rising leg extending upward from the upper end of the inclined portion 44C. 44D and the end surface leg 44E formed at the rear end edge of the inclined portion 44C.

Reference numeral 45 denotes a top plate having an L-bending leg 45A on the left side surface and a falling leg 45B on the other three sides. Reference numeral 46 is a corner post disposed in the rear right corner. The bottom plate 4
2. The partition plate 44 and the top plate 45 are welded to the inner surface side of the front plate 43, and the upper and lower ends of the corner posts 46 are welded to the top plate 45 and the bottom plate 42, respectively, to form the skeleton of the housing 41. . 47 is an air hole cover screwed on the top plate 45, 48 is a back cover screwed on the back surface of the housing 41,
Reference numeral 49 is a side plate screwed to the right side surface of the housing 41.
The end legs 44E of the partition plate 44 and the back cover 48 are in contact with each other, and the inside of the housing 41 is covered by the partition plate 44 in the air passage 1
04 and the refrigerant device compartment 105.

Reference numeral 1 denotes a compressor mounted on the left side of the bottom plate 42 as shown in FIG. A condenser 2 is inserted between the horizontal portion 44B of the partition plate 44 and the L-bending leg 45A of the top plate 45. L-shaped end plates 2A are provided on both sides of the condenser 2, and are fixed to the left side leg 43A of the front plate and the left side leg 48A of the back cover via the end plates 2A. An evaporator 3 is located below the condenser 2 and is arranged along the condenser 2 in the refrigerant device compartment 105. The evaporator 3 has a shell-and-tube structure and its details will be described later.

Reference numeral 4 denotes an air passage 10 so that air is discharged upward.
4 is a fan disposed in the upper part of the motor 4, and includes a motor 4A, an axial fan 4B, and approximately 90 fans surrounding the axial fan 4B.
It has four mounting legs 4C arranged at intervals.
Further, as shown in FIG. 4, an end portion of the mounting foot 4C is formed with a horizontally bent ear-shaped fixing portion 4C1. One of the mounting feet 4C is provided with a lead wire 4D extending from the motor 4A. There is. A circular hole 45C slightly larger than the outer diameter of the axial fan 4B and slits 45D and 45D1 are radially formed from the circular hole 45C on the upper surface of the top plate 45. The slit 45D has a width that allows the mounting foot 4C to penetrate therethrough, and one slit 45D1 has a width that allows the lead wire 4D to also penetrate therethrough.

With the air hole cover 47 removed (FIG. 4),
The fan 4 can be inserted from the outside of the upper surface of the housing 41 by penetrating the round hole 45C and the slits 45D, 45D1 into the air passage 104. Then, the fixing portion 4C1 hooked on the outer surface of the top plate 45 is fixed by screwing. This allows
The troublesome work of screwing and fixing while supporting the weight of the fan 4 is eliminated. After that, the wind window cover 47 is screwed to the top plate 45. The wind window cover 47 is an axial fan 4B.
Has an air hole 47A having substantially the same diameter as the outer diameter of
The slits 45D and 45D1 are closed, and the fixing portion 4C1 is also hidden.

Next, details of the shell-and-tube type evaporator 3 will be described mainly with reference to FIGS. Reference numeral 21 denotes a shell of the evaporator 3, which is composed of a circular first end plate 23 and a circular second end plate 24 welded to both ends of the cylindrical body 22.
The first and second end plates 23, 24 have a diameter larger than the diameter of the cylindrical body 22 and are eccentrically welded downward to the cylindrical body 22 and fixed screw holes 23A, 2 are provided at their lower ends.
4A is screwed. Reference numeral 25 is a liquid inlet pipe welded to the side surface of the cylindrical body 22. Reference numeral 26 is a liquid outlet pipe welded to the second end plate 24. The inner diameter of the liquid outlet pipe 26 and the lower end of the prepared hole 24B of the second end plate 24 are made to coincide with the inner lower end of the cylindrical body 22. ing. Further, the liquid temperature sensor 11 is screwed and attached to the second end plate 24.

Reference numeral 27 denotes a plurality of finned refrigerant tubes for heat exchange, which are arranged so that a ring-shaped fin 27A is formed on the outer surface of substantially the entire length thereof and an equilateral triangle is formed between the center points thereof as shown in FIG. Has been done. Reference numeral 32 denotes a support rod that supports a baffle plate 31 described later, and a pair of the support rods are arranged on a parallel line with one side of the equilateral triangle excluding the horizontal side. The finned refrigerant pipes 27 are divided into two groups, that is, diagonally downward and diagonally upward, and are arranged in an equilateral triangle with the pair of support rods 32 as boundaries. A refrigerant inlet pipe 29 is connected to the finned refrigerant pipe 27 located at the lowermost stage of the diagonally lower group, and a refrigerant outlet pipe 30 is connected to the finned refrigerant pipe 27 located at the uppermost stage of the diagonally upper group. There is. The refrigerant inlet pipe 29 and the refrigerant outlet pipe 30 are connected to the first end plate 23.
Has been pulled out to the outside. The finned refrigerant pipes 27 are connected by U-shaped pipes 28 brazed at their ends, and when traced from the refrigerant inlet pipe 29, they are horizontal, obliquely upward, horizontal ...
And U-turn are repeated to form one path (1 path) to the refrigerant outlet pipe 30.

Reference numeral 31 denotes a plurality of baffle plates, through which a plurality of finned refrigerant pipes 27 penetrate, and are disposed in the shell 21 at right angles to the finned refrigerant pipes 27. As shown in FIG. 7, the baffle plate 31 has an arc 31A that contacts the inner diameter of the cylindrical body 22.
With the outer shape having the cutout edge 31B, a plurality of tube holes 31C through which the finned refrigerant tube 27 penetrates are formed.
The arc 31A is provided with a pair of slots 31D, and the support rod 32 is provided with a slit 32A. The edge of the slot 31D is fitted in the slit 32A to prevent the baffle plate 31 from moving, and the finned refrigerant pipe 27 is supported by the baffle plate 31. The cutout edge 31B of the baffle plate 31 is on a line parallel to one side of the equilateral triangle except the horizontal side, and the cutout portion 107 formed by the cutout edge 31B and the inner diameter of the cylindrical body 22 is The baffle plates 31 are arranged side by side so that they are alternately located obliquely downward and obliquely upward with respect to the center of the cylindrical body 22.

Next, the procedure for assembling the evaporator 3 will be described. First, the finned refrigerant tubes 27 are penetrated into the tube holes 31C of the five baffle plates 31, and then the U-shaped tubes 28 are brazed to both ends thereof. Refrigerant inlet and outlet pipes 29 and 30 that are brazed through the first end plate 23 are brazed to the finned refrigerant pipes 27 that are the start and end points of one pass. On the other hand, the cylindrical body 22, the second end plate 24, and the liquid inlet / outlet pipes 25 and 26 are assembled by welding in another process. The finned refrigerant pipe 27 portion assembled by brazing as described above is provided in the slot 31 of the baffle plate 31.
The support rod 32 is fitted into D and then inserted into the cylindrical body 22. In order to prevent the support rod 32 from coming off during this insertion, a notch may be provided near the groove 31D and caulked. Next, the first end plate 23 and the cylindrical body 22 are welded and completed. Both ends of the support rod 32 have first and second end plates 2
3 and 24, and the side surfaces contact the inner surface of the cylindrical body 22 to prevent movement. This structure has high productivity because it does not require screwing or welding.

The second end plate 24 of the evaporator 3 is fixed to the front plate 43 by a screw member 33 screwed into the screw hole 24A. Similarly, the first end plate 23 is fixed to the inner surface of the bottom plate 42 via a metal fitting 54 having an L-shaped cross section. In this attached state, the liquid inlet pipe 25 projects out of the housing 41 through a hole 44A1 formed in the vertical falling leg 44A of the partition plate 44. Further, the liquid outlet pipe 26 and the liquid temperature sensor 11
Is formed in the front plate 43 from the free hole 43C to the housing 41.
It is jumping out. A T-shaped joint pipe 34 is connected to the liquid outlet pipe 26, and one port of the joint pipe 34 (T branch port 34A in FIG. 1 in this embodiment) is used for the liquid outlet and the other port. The plug 35 is always screwed in and used as a drain. The lead wire 11A of the liquid temperature sensor 11 that is outside the housing 41 is appropriately penetrated through the front plate 43 and drawn into the refrigerant device compartment 105, and is connected to the receptacle connector 10A described later by wiring.

Next, the refrigerant pipe will be described. A discharge port (not shown) of the compressor 1 and an inlet pipe (not shown) of the condenser 2 are connected by a discharge pipe 12, and an outlet pipe (not shown) of the same.
And the refrigerant inlet pipe 29 of the evaporator 3 are respectively the joint pipe 1
Capillary tube (not shown) via 3 and 14
And the suction port 1B of the compressor 1 connected to the refrigerant outlet pipe 30.
Are connected by a suction pipe 15. The partition plate 44 is provided with a cutout portion 44F for passing the discharge pipe 12 and the joint pipe 13. Further, details of the refrigerant pipe such as the pressure switch and the solenoid valve for switching the length of the capillary tube are omitted, but the back cover 48 and the side plate 49 can be easily removed and brazed.

Next, details of the electric section 103 will be described mainly with reference to FIGS. 1, 2, 4, and 5. A box-shaped case 60 is detachably screwed to the front plate 43 of the housing 41. The height of the case 60 is formed to be shorter than the height of the housing 41, and the case 60 is mounted close to the ceiling surface side of the housing 41, and the liquid outlet pipe 26 portion of the evaporator 3 is located below it. In addition, the width is also formed to be smaller than the width dimension of the housing 41, and is mounted close to the right side surface of the housing 41.
A first ventilation hole 60A is formed on the lower surface of the case 60, and a second ventilation hole 60B is formed on the upper left corner of the back surface. The vent hole 60B and the air passage 104 are communicated with each other through an intake opening 43D provided in the front plate 43. Intake opening 43D
And the vent hole 60B is indicated by the arrow a.
Is located on the negative pressure side (the side on which the rotating axial fan 4B moves away from). Reference numeral 53 is a deflection plate disposed on the inner surface of the front plate 43, and extends obliquely from the edge of the intake opening 43D along the direction of the rotation direction a into the air passage 104.

Reference numeral 61 denotes a vertical partition plate that is laterally extended to the upper part of the case 60, and the left and right ends are fixed to the left and right side surfaces of the case 60. Reference numeral 61A is a fixed portion formed by bending the vertical partition plate 61 from the upper and lower ends to the front, and the control board 5 is attached to the fixed portion 61A. A variable speed control device 7 for controlling the variable speed of the compressor 1, which is located below the control board 5;
An electromagnetic switch 8 and a circuit breaker 9 for operating the fan 4 are attached to the back surface of the case 60. A power cable (not shown) is drawn into and connected to the circuit breaker 9 through the wiring hole 60E. The variable speed control device 7 generates a large amount of heat due to the inverter control, and has a heat sink 7A (FIG. 5) on its back. The vertical partition plate 61 is disposed at a distance from the back surface of the case 60 that is substantially equal to the depth dimension of the heat sink 7A, and the ventilation hole 60B is located at the back thereof. Further, the vent hole 60A on the bottom surface is provided at a lower portion of the heat sink 7A.

The lead wire 4D of the fan 4 has a ventilation opening 43D.
Through the ventilation hole 60B, is drawn into the case 60 from the air passage 104, passes through the back side of the vertical partition plate 61, and is connected to the electromagnetic switch 8 by wiring. The power cable 1C from the compressor 1 is wired and connected to the variable speed control device 7 through the wiring hole 43E of the front plate 43 and the wiring hole 60D of the case 60. In addition, a receptacle connector 10A to which a control wire from a pressure switch or solenoid valve (not shown) and a lead wire 39 of the liquid temperature sensor 11 are connected is attached to the refrigerant device section 105 side of the front plate 43 to receive this. A square hole 60C is formed in the back surface of the case 60. The plug connector 10B inserted into the receptacle connector 10A and the connector 5B of the control board 5 are connected by wiring.

Reference numeral 62 denotes a front cover arranged on the front surface of the case 60, which has an L-shaped cross section having the same width dimension as the housing 41. The front cover 62 forms a compartment 106 on the right side of the case 60, which is ventilated at the entire height. Front cover 62
A window 62A having a display plate 63 corresponding to the display and operation parts 5A of the control board 5 is provided on the upper part of the window. A room temperature sensor 6 is a thermistor arranged in a vented compartment 106, and is wired to the connector 5C of the control board 5 penetrating the left side surface of the case 60. Room temperature sensor 6
Ventilation slits 62 on the two sides of the front cover 62 corresponding to the position of
B is drilled.

Next, the liquid cooling device 101 having the above structure.
The operation of will be described. By the operation, the refrigerant circulates in the cycle of returning from the compressor 1 through the refrigerant pipe to the condenser 2, the capillary tube (not shown), the evaporator 3 and back to the compressor 1. A machining liquid such as water or oil is forcibly circulated in the shell 21 of the evaporator 3 by a turbine pump and cooled by heat exchange with a refrigerant passing through the finned refrigerant pipe 27. The high-temperature refrigerant gas flowing in the condenser 2 is cooled by heat exchange with the air sucked into the air passage 104 through the condenser 2 by the fan 4. The hot air after the heat exchange is discharged from the wind window 47A. The temperature of the working liquid exiting the evaporator 3 is detected by the liquid temperature sensor 11, and the room temperature is detected by the room temperature sensor 6. The two temperatures are compared and calculated by the control board 5, and the variable speed controller 7 controls the compressor 1
The number of revolutions is changed to continuously increase or decrease the cooling capacity, and the temperature of the working fluid is controlled with high accuracy so as to be the same as room temperature.

An air passage 104 having no obstacles is formed in the housing 41 by the partition plate 44, and the air sucked through the condenser 2 is smoothly deflected upward by the partition plate 44, so that the air resistance is improved. Is small and the cooling efficiency of the condenser can be improved. Further, other refrigerant devices such as the evaporator 3 are not heated by the hot air that has passed through the condenser 2. By the way, a space for intake is required in front of the condenser 2 (on the left side surface of the housing 41). The evaporator 3 is arranged along the lower part of the condenser 2 and its liquid inlet / outlet pipes 34A and 25 are on the left side surface side of the housing 41 as shown in FIG. Can be processed in space. Further, the evaporator 3 is configured by a cylindrical shell and tube type,
Since it is arranged by utilizing the dead space under the condenser 2, the width of the housing 41 can be made small, and as shown in FIG. 2, the right side surface of the condenser 2 can be arranged in close contact with a wall surface or the like. The area can be reduced.

When the fan 4 is operated, the air pressure in the air passage 104 becomes negative, and the air in the case 60 is sucked from the ventilation opening 43D and the ventilation hole 60B as shown by the arrow b in FIG. The outside air is sucked in. The inside of the case 60 is cooled well by this forced ventilation. The ventilation opening 43D is located on the negative pressure side with respect to the rotation direction of the fan 4 (arrow a), and since this negative pressure is added to the negative pressure in the air passage 104, the suction force is large. Therefore, the machining fluid such as water intrudes through the wind window 47A due to an accidental accident such as the rupture of the machining fluid pipe, and the machining fluid scattered on the axial fan 4B is deflected by the deflection plate 5.
3 does not enter the ventilation opening 43D. Also,
The mist-like scattered water diffused by the collision is also carried away along with the air flow in the direction of arrow b. Therefore, the electrical insulation of the electric and electronic components in the case 60 is not impaired. Further, since the slits 45d and 45d1 for assembling the fan 4 with high productivity are closed by the air hole cover 47, there is no pressure loss due to that, and the ventilation opening 43D and the ventilation hole 60B are the wiring of the lead wire 4D of the fan 4. Available as a hole.

The vertical rising leg 44D of the partition plate 44 and the side plate 4
An elongated gap g is formed between the gaps 9, and the air in the refrigerant device compartment 105 is sucked into the air passage 104 from the gap g by the suction force of the fan 4, and the hole 44A1 for the liquid inlet pipe 25 of the evaporator 3 is formed. Outside air is sucked in from around. The air flow of the forced ventilation (arrow c in FIG. 3) cools the compressor 1 that is heated by the high-temperature refrigerant gas to reduce the temperature rise of the compressor 1 and enable high-speed operation. As described above, even if a machining liquid such as water enters from the wind window 47A, the gap g is narrow, so that the water is restricted from entering the refrigerant device compartment 105, and the invaded water travels through the side plate 49 to form a drain pan. Bottom plate 42
It does not interfere with refrigerant equipment and electric wiring.

The liquid inlet pipe 25 of the evaporator 3 is welded to the center of the side surface of the cylindrical body 22. The manufacturing of this portion requires drilling on the circular arc surface of the cylindrical body 22, circular arc processing on the welding-side end surface of the liquid inlet pipe 25, and welding of the elliptical joint, which requires a large number of manufacturing steps. On the other hand, the liquid outlet pipe 26 has the end plate 24.
Since it is welded to the base plate 24, the prepared hole 24B of the end plate 24 can be punched by press working, and the end face processing of the liquid outlet pipe 26 is unnecessary, and welding is easy. Further, the lower end of the inner diameter of the liquid outlet pipe 26 coincides with the lower end of the inner diameter of the cylindrical body 22, and a T-shaped joint pipe 34 is screwed and connected to the tip of the liquid outlet pipe 26. Since the mouth is used as a drain mouth,
It is not necessary to provide a separate drain pipe, and the evaporator can be manufactured inexpensively. Further, the T-shaped joint pipe 34 may be directly welded to the end plate 24 without using the liquid outlet pipe 26. In this case, the dull hole 43c of the front plate 43 is also sized so that the joint pipe 34 can penetrate therethrough.

The plurality of finned refrigerant tubes 27 of the evaporator 3 are
One path is formed from the lowermost refrigerant inlet pipe 29 to the uppermost refrigerant outlet pipe 30, and since there is no trap midway,
The lubricating oil carried away from the compressor 1 together with the refrigerant gas is favorably returned. As is well known, the machining fluid that has entered the shell 21 through the fluid inlet pipe 25 is meandered by the baffle plate 31, turbulent flow is promoted, and the heat transfer coefficient is improved. By the way, the working fluid contains fine metal sludge which is generated by electric discharge machining and is not removed by the filter. The sludge easily stays at the bottom of the cylindrical body 22 due to its own weight. This is particularly noticeable when the flow rate of the working fluid is small or when the processing is stopped. The cutout portion 107 formed between the cutout edge 31B of the baffle plate 31 and the cylindrical body 22 reaches the vicinity of the bottom of the cylindrical body 22 as described above. Also, the cutout portion 107
As a result, a sludge having a high flow velocity is formed at the bottom of the cylindrical body 22 even when the working fluid flow rate is small, so that the sludge is discharged together with the working fluid. Therefore, even if it is used for a long period of time, a decrease in cooling capacity can be avoided.

Since the liquid outlet pipe 26 and the joint pipe 34, which also functions as a drain pipe connected to the liquid outlet pipe 26, are linearly connected to the end face of the cylindrical body 22, the flow path resistance at this connecting portion is small and the sludge is cylindrical. The sludge is satisfactorily discharged from the body 22 into the liquid outlet pipe 26, the joint pipe 34 also functions as a sludge reservoir, and the accumulated sludge can be satisfactorily discharged by removing the plug 35. The liquid outlet pipe 26 and the joint pipe 34 are the front plate 4 of the housing.
The liquid cooling device 101, which penetrates 3 and is disposed below the electric part 103, can save the depth dimension and can be miniaturized. Further, since the end plate 24 of the evaporator 3 can be screwed to the front plate 43 by using the fixing screw hole 24A, a separate mounting leg can be eliminated. Further, the liquid temperature sensor 11 is screwed into the end plate 24. This liquid temperature sensor 11
The lead wire 11A of the liquid temperature sensor 11 extends outside the housing 41 and is not located near the upper surface of the bottom plate 42 in the housing where the humidity becomes high when dew condensation occurs.
It is effective in preventing insulation deterioration from the drawer.

Since the vertical partition plate 61 is arranged at a predetermined distance from the rear surface of the case 60 that is substantially equal to the depth dimension of the heat sink 7A of the variable speed control device 7, as shown by the arrow d in FIG. Most of the outside air sucked from the ventilation holes 60A on the bottom surface passes between the heat sinks 7A,
It passes through the back surface of the vertical partition plate 61 and is sucked into the ventilation hole 60B. Therefore, the thermal adverse effect that the control board 5 is heated by the air warmed by the heat sink 7A can be avoided. Further, since the lead wire 4D of the condenser fan 4 is laid on the back surface of the vertical partition plate 61, it can be wired in the shortest distance, the vertical partition plate 61 functions as an electromagnetic shield plate, and the control board 5 by the lead wire 4D is used. Electromagnetic adverse effects on the magnetic field are prevented. Further, the vent hole 60A is used for the heat sink 7A.
Since it is located at the bottom of the heat sink 7,
The outside air is linearly sucked into A, and the heat sink 7A is satisfactorily air-cooled, so that the dust sucked together with the outside air can be prevented from diffusing to the substrate portion and the control substrate 5 portion of the variable speed control device 7.

The width of the case 60 is made smaller than the width of the housing 41, and the compartment 106 adjacent to and adjacent to the case 41 has ventilation.
Since the room temperature sensor 6 is disposed in the air-permeable compartment 106, the heat generation in the case 60 does not affect the rising air flow. In addition, the compartment 10 with ventilation
6 is located on the left side surface where the condenser 2 is arranged, and a wide range of outside air is sucked through the ventilation slit 62B through the vented compartment 106, so that an accurate room temperature can be measured.

Since the electric section 103 mainly composed of the case 60 is constructed independently of the housing 41,
Wiring assembly of electronic parts can be efficiently performed in a separate process. The electric part 103 for which the wiring assembly is completed is similarly screwed to the refrigerant device part 102 for which the wiring assembly is completed in another process. Both control lines are connector 1
It can be completed by plugging in 0A and 10B. The lead wire 4D of the fan 4 and the power cable 1C from the compressor 1 are drawn into the case 60 through the ventilation hole 60B and the wiring hole 60D, respectively. The ventilation hole 60B and the wiring hole 60D are made larger than the ventilation opening 43D and the wiring hole 43E, respectively, in order to facilitate the drawing operation.

[0045]

According to the first aspect of the present invention, the side plate and the condenser forming the side wall portion of the housing, and the fan arranged on the top plate forming the housing for discharging the air in the housing. A partition plate disposed inside the housing, inclined from a lower part of the condenser toward an upper part of the side plate to form an air passage partition with the top plate, the partition plate and the partition plate. A compressor provided in a cooling device compartment formed between the bottom plate forming the housing and a compressor disposed below the condenser and facing the compressor, and the refrigerant from the condenser. Since it is equipped with an evaporator that forms a circulation path to the compressor, the space below the condenser can be effectively used, and liquid piping can be formed in the intake space of the condenser, and the installation area of the liquid cooling device can be set. There is an effect that can reduce.

According to the second aspect of the present invention, the case attached to the housing and the case are provided with ventilation holes at a position on the negative pressure side with respect to the rotation direction of the fan, and a part of the ventilation hole is provided. Since the deflecting plate for covering is provided, forced ventilation of the case is facilitated, and there is an effect that the machining liquid can be prevented from entering the case even if the machining liquid enters from the intake opening.

According to a third aspect of the present invention, there is provided a top plate which constitutes the casing, and an axial fan having a plurality of mounting feet for discharging the air in the casing, and the ceiling plate has the axial fan. A second hole having a slit shape that can penetrate the mounting foot, and the fan and the mounting foot are formed from the top surface side of the top plate to the first and second holes, respectively. Since the fan is inserted into the hole and the mounting foot of the fan is fixed to the upper surface of the top plate, there is an effect that the work of mounting the fan while supporting it can be reduced.

According to the fourth aspect of the invention, the partition plate has a vertical portion extending vertically upward in parallel with the side plate, and a gap is formed between the side plate and the vertical portion of the partition plate. There is an effect that air is sucked into the air passage section from the refrigerant equipment section through the passage, the temperature rise in the refrigerant equipment section is reduced, and the intrusion of splashed water from the air passage to the refrigerant equipment section is restricted.

According to the fifth aspect of the invention, the evaporator is a shell-and-tube type, and one side is horizontally located inside the shell, and the refrigerant pipe with fins arranged in a triangle is crossed and penetrated, and , A plurality of plate-shaped baffle plates arranged at a predetermined interval, the baffle plate is formed in a cutout shape by cutting out a part of a circle in contact with the inner wall of the shell, the cutout end of the baffle plate Since the edges are arranged in parallel with one side of the hypotenuse of the triangle and are alternately arranged so as to face the notched edges of the adjacent baffles, the edges are included in the working liquid caused by the baffles. It is effective in reducing the accumulation of sludge.

[Brief description of drawings]

FIG. 1 is an overall perspective view of an embodiment of a liquid cooling device according to the present invention.

FIG. 2 is a front view of the liquid cooling device according to FIG. 1 with a front cover removed.

FIG. 3 is a back view of the liquid cooling device according to FIG. 1 with a back cover removed.

FIG. 4 is a partially cutaway top view of the liquid cooling device of FIG. 1 with an air hole cover removed.

5 is a cross-sectional view taken along the line AA of FIG.

6 is a partially cutaway left side view showing an evaporator of the liquid cooling device of FIG. 1. FIG.

7 is a cross-sectional view taken along the line BB of FIG.

FIG. 8 is a front view of a baffle plate of the evaporator according to FIG.

FIG. 9 is a front view of a conventional liquid cooling device with a front cover removed.

[Explanation of symbols]

1 ... Compressor, 2 ... Condenser, 3 ... Evaporator, 4
... Fan 4B ... Axial fan, 4C ... Mounting feet, 4D ...
Lead wire 5 ... Control board, 6 ... Room temperature sensor, 11 ...
Liquid temperature sensor 21 ... Shell, 22 ... Cylindrical body, 23 ... First end plate 24 ... Second end plate, 25 ... Liquid inlet pipe, 26 ...
・ Liquid outlet pipe 27 ... Refrigerant pipe with fin, 31 ... Baffle plate, 31B
... Notch edge 34 ... Joint pipe, 41 ... Housing, 42 ... Bottom plate, 43 ... Front plate 44 ... Partition plate, 44D ... Vertical rising leg, 45 ...
..Top plate 45D, 45D1 ... Slit, 47 ... Air hole cover 48 ... Back cover, 49 ... Side plate, 60 ... Case 60A, 60B ... Vent hole, 61 ... Vertical Partition plate 62 ... Front cover, 101 ... Liquid cooling device, 102
... Refrigerant device section 104 ... Air passage, 105 ... Refrigerant device section

Claims (5)

[Claims] 1. A side plate and a condenser forming a side wall of the housing, a fan arranged on a top plate forming the housing, for discharging air in the housing, and arranged inside the housing. Is
A partition plate that inclines from the lower part of the condenser toward the upper part of the side plate, and forms an air passage section with the top plate,
A compressor arranged in a cooling device section formed between the partition plate and a bottom plate forming the casing, and arranged below the condenser and facing the compressor, A liquid cooling device, comprising: an evaporator forming a circulation path of a refrigerant from a condenser to the compressor. 2. A case attached to a housing, and a ventilation plate is provided in the case at a position on the negative pressure side with respect to the rotation direction of the fan, and a deflection plate is provided to cover a part of the ventilation hole. The liquid cooling device according to claim 1, wherein: 3. A top plate constituting a casing, and an axial fan having a plurality of mounting feet for discharging the air in the casing, wherein the ceiling plate can be penetrated by the first axial fan. A slit-shaped second hole that can penetrate the hole and the mounting foot is provided, and the fan and the mounting foot are inserted into the first and second holes from the upper surface side of the top plate, respectively, and A liquid cooling device in which a mounting foot of a fan is fixed to an upper surface of the top plate. 4. The partition plate has a vertical portion extending vertically upward in parallel with the side plate, and a gap is provided between the side plate and the vertical portion of the partition plate. Liquid cooling device. 5. The evaporator is a shell-and-tube type, and one side is horizontally located inside the shell, and the refrigerant pipes with fins arranged in a triangle are crossed and penetrated and arranged at a predetermined interval. A plurality of plate-shaped baffle plates are provided, and the baffle plate is formed in a cutout shape by cutting out a part of a circle that contacts the inner wall of the shell, and the cutout edge of the baffle plate is the hypotenuse of the triangle. The liquid cooling device according to claim 1, wherein the liquid cooling device is arranged in parallel with one side and is alternately arranged so as to face the notched edge of the adjacent baffle plate.