JPS62138686A - Heat exchanger - Google Patents

Abstract

PURPOSE:To eliminate pulsating temperature variation in the oil temperature by submerging the heat absorption section of a heat pipe into the oil in a second flow passage section and arranging the heat radiation section outside the oil tank. CONSTITUTION:High temperature oil that has flowed into a first flow passage of an oil tank 20 flows into a second flow passage, and passes through the heat absorption section 26a of a heat pipe 26 to heat the heat absorption section 26a. At this time a working liquid 27 is also heated. The working liquid 27 robs heat of the oil and evaporates, moving in the heat pipe 26 to the side of the heat radiation section 26b. The steam of the working liquid 27 which has moved is cooled by the surrounding air and condenses but at the same time discharges condensation latent heat and radiates the heat of oil. The working liquid 27 that has condensed and liquefied moves in the heat pipe 26 to return to the side of the heat absorption section 26a. With this arrangement the heat of the high temperature oil 1 passing through the absorption section 26a of the heat pipe 26 is transported from the heat absorption section 26a to the heat radiation section 26b of the heat pipe 26 and radiates heat to the surrounding air by the repeated evaporation and liquefaction of the working liquid 27 in the heat pipe 26.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an oil heat exchange device for equipment that uses oil, such as a spindle system in a machine tool, for example.

[Conventional technology]

Figure 2 shows an outline of a conventional oil heat exchange device for the spindle system of a general machine tool, as disclosed in, for example, "Mechanical Technology" (Vol. 29, No. 6, P1015, 1981, published by Nikkan Kogyo Shimbun). In Figure 2, (1) is heated in the main spindle system (not shown) of a machine tool (for example, a hole type), and (2) is the main spindle of the machine A. An oil tank stores oil (1) discharged from the system in a high temperature state, and (3) is a pump that guides the oil in the oil tank (2) into a cooling tank (5) via piping (4).

(5a) and (5b) are the outer tank and inner tank of the cooling tank (5), and the oil led by the pump (3) is the outer tank (5a).
) and the inner tank (5b), and introduced into the inner tank (5b) from the upper end of the inner tank (5b). (6) is the inner tank (5b
), the cooling pipe (7) is connected to one side of the cooling pipe (6) via piping (8), and is connected to the other side of the cooling pipe (6) via piping (9). connected.

In refrigeration, the coolant that has become high temperature by cooling the oil in the cooling tank (5) is introduced through the pipe (8), and the coolant that has become low inside is supplied to the cooling pipe (6) through the pipe (9). The device (10) has a cooling tank (5) on one side.
is placed near the bottom of the inner tank (5b).

The other side is connected to the spindle system of the machine tool, and the low temperature oil (11) in the inner tank (5b) of the cooling tank (5), which is cooled by the cooling pipe (6), is pumped near the bottom of the inner tank (5b). Supply piping introduced from the main shaft system of the machine tool, (12
) is a thermostat (12) that detects the oil temperature in the supply pipe (13), and depending on the detection signal from this thermostat (12), the refrigeration system (7) is turned on by the control means (not shown).
N: Turn off.

Next, the operation will be explained. Ura (1), which is heated in the spindle system of a machine tool and becomes a high crystalline state, is discharged into an oil tank (2). The oil stored in the oil tank (2) is pumped to the outer tank (5) of the cooling tank (5) by the pump (3).
a) and the inner tank (5b).

It is introduced into the inner tank (5b) from the upper end of the inner tank (5b). The cooling pipe (6) is wound around the outer circumference of the inner tank (5b).
) heat exchanged and cooled the oil (
11) is supplied to the spindle system of the work *W through the supply pipe (10). On the other hand, the high-temperature cooling medium in the cooling pipe (6) after cooling the oil passes through the refrigeration device (7), becomes a low-temperature cooling medium again, and is supplied to the cooling pipe (6). Further, the oil temperature is controlled by detecting the oil temperature using a thermostat (12) or the like disposed in the supply pipe (10), and turning the refrigeration device (7) on and off using a control means. Therefore, when the refrigeration system (7) is ONI, it is in cooling operation, and the refrigeration system (7) supplies a certain amount of low-temperature cooling medium to the cooling pipes (6) to fill the cooling tank (5). The oil in the inner tank (5b) is forcibly cooled.

Also, if the heat generation amount on the machine tool side is low, use a refrigeration device (7)
If the amount of cooling caused by the oil becomes too large, resulting in excessive cooling, temporarily turn off the refrigeration system (7) and stop the operation, and when the oil temperature rises, turn on the refrigeration system (7) again to start the cooling operation.

[Problem that the invention seeks to solve]

However, in the conventional heat exchange device described above.

Since the oil temperature is controlled by turning on and off the refrigeration system (7), there is a problem that pulsations occur in the temperature of the oil (11) passing through the supply pipe (10).

In particular, when the oil (11) passing through the supply pipe (10) is supplied to the spindle system of a machine tool, there is a fatal flaw in that the pulsations in the oil temperature of the oil (11) directly lead to pulsations in machining and machining accuracy. there were.

This invention has been made to solve the above-mentioned problems, and its purpose is to provide a heat exchange device that does not cause pulsations in oil temperature.

[Means for solving problems]

In the heat exchange device according to the present invention, a single-curved tank is formed in an annular shape, and a partition member is arranged at one location in the annular portion to form at least three flow path portions from a first flow path portion to a third flow path portion. 2
A first flow path section accommodates oil discharged from the equipment in a high level state, and a second flow path section.

The heat pipe is configured to flow sequentially into the third flow path section, the heat absorption section of the heat pipe is immersed in the oil in the second flow path section of the oil tank, and the heat dissipation section of the heat pipe is arranged outside the ura tank.
A heat radiating device is installed in the heat radiating part of the top pipe, and a supply means is provided for supplying the oil that has been cooled by the pipe and has flowed from the second flow path section of the oil tank into the third flow path section to the equipment. be.

[Effect]

In the heat exchange device of the present invention, the oil in the second flow path section of the oil tank is naturally controlled and continuously cooled by the temperature difference between the heat absorption section side of the heat pipe and the heat radiation section side of the heat pipe. Also, the high temperature oil that has flowed into the first flow path section of the oil tank flows into the second flow path section, flows through the heat absorbing section of the heat pipe, and flows into the third flow path section, resulting in a high cooling effect. Stable water without pulsation is supplied to the equipment.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 shows a side sectional view.

FIG. 2 shows a front view, and FIG. 3 shows a plan view of the oil tank. In each of these figures, (1) is a device that is heated, for example, by the spindle system (not shown) of a machine tool.

The oil (20) heated to a high temperature state is formed into, for example, a rectangular ring shape, and a partition member (21) is arranged at one location of the ring part to form a first flow path part (22). , a second flow path section (23), and a third flow path section (24), and the second flow path section (23) has three flow paths (23a).
), (23b), and (23c), the first flow path section (22) accommodates the oil (1) discharged from the spindle system of the machine tool in a high temperature state, and the second flow path section ( 23),
This is an oil tank configured to allow oil to sequentially flow into the third flow path section (24).

(25) is an oil return pipe that guides filtered oil (1) discharged in a high temperature state from the main shaft system of the machine tool to the first flow path section (22).

In (26), the endothermic parts (26a) and (26n) are immersed in the oil in the flow path (23a) and the flow path (23c) of the second flow path section (23) of the oil tank (20), Oil tank (2
0) Each heat dissipation part (26bL
(26b) is arranged and has a coheed pipe, and after the inside is vacuum depressurized, a predetermined amount of working liquid (27) such as fluorocarbon or ammonia is sealed, and the heat of the oil is transferred to the heat absorbing part (26a).
L (26a) absorbs heat and heat dissipates (26b), (26
b) Transport and radiate heat. (28) is, for example, a heat pipe (2Fi).

This is a heat radiating device arranged to commonly cool the heat radiating portions (26b) and (26b) of (26), and FIG. 2 shows an example in which it is composed of a heat radiating fan. (29) is an air filter, (30) a pigtail pipe (26),
The oil (31) is cooled by (26) and flows into the third flow path (24) from the second flow path (23).
) to the spindle system of a machine tool.For example, a suction filter (30a) disposed in the third flow path section (24) of an oil tank (20), and a suction filter (30n) and a machine tool. A pipe (30b) that connects the main shaft system of the machine and a suction filter (3
0a) and a pump (30c) for introducing it to the spindle system of the machine tool.

Next, the operation will be explained. The oil (1) heated and heated to a high temperature in the spindle system of the machine tool is discharged into the first flow path section (22) of the oil tank (20). The high-temperature oil that has flowed into the first flow path section (22) of the oil tank (20) flows into the flow path (23a) of the second flow path section (23), and then flows into the heat absorption section (26a) of the heat pipe (26). ), and at this time heats the endothermic part (26a) of the heat pipe (26), and this heating also heats the working liquid (27) sealed inside, absorbing heat from the ribs as latent heat of vaporization and vaporizing it. , heat) - moves inside the heat dissipation part (26bj) of the heat pipe (26) to the heat dissipation part (26bj) of the heat pipe (26).
The vapor of the working liquid (27) such as Freon that has moved to the side is cooled by the surrounding air by the heat radiation fan (28). At this time, the vapor of the working liquid (27) such as fluorocarbon is condensed and liquefied, but the latent heat of condensation is released to the surrounding air, and the heat content of the oil is radiated to the surrounding air. Condensed and liquefied working fluid (27)
moves inside to the endothermic part (26a) of the B1-pipe (26) and returns thereto. In this way, the heat pipe (
By repeating vaporization and liquefaction of the working if body (27) in the heat pipe (26), the heat absorption part (26n) of the heat pipe (26)
The heat of the high temperature oil (1) passing through the heat pipe (26
) The heat is transported from the heat absorption part (26a) of the heat pipe (26) to the heat radiation part (26b) of the heat pipe (26), and the heat is radiated to the surrounding air. Therefore, the flow path (23a) of the second flow path portion (23) of the oil tank (20)
) The heat of the high-temperature oil ( ) is taken away by the heat absorbing part (26n) of the heat pipe (26), and the temperature is lowered and the oil is cooled. This cooled oil flows into the flow path (23b) of the second flow path section (23), and further flows into the flow path (23b) of the second flow path section (23). J (23cl), passes through the heat absorption part (26a) of the heat pipe (26), and at this time the heat pipe (26
The heat absorbing part (26a) of the heat pipe (26a) is heated, and this heating also heats the working liquid (27) sealed inside the heat pipe (26a).
) to the heat dissipation part (26b) side.

The steam of the rfDJ body (27) made of fluorocarbons and the like that has moved to the heat radiating part (26b) side of the heat pipe (26) is cooled by the surrounding air by the heat radiating fan (28). At this time, the vapor of the working liquid (27) such as fluorocarbon is condensed and liquefied.

The latent heat of condensation is released to the surrounding air, and the heat content of the oil is radiated to the surrounding air. The condensed and liquefied liquid (27) moves inside to the endothermic part (26a) of the heat pipe (26) and returns. In this way, by repeatedly vaporizing and liquefying the working liquid (27) in the heat pipe (26), the heat of the oil passing through the heat absorption part (26a) of the heat pipe (26) is transferred to the heat pipe (26). Heat is transported from the heat absorption part (26a) to the heat radiation part (26b) of the heat pipe (26) and radiated to the surrounding air. Therefore, the second
The heat of the oil that has flowed into the flow path (23c) of the flow path section (23) is taken away by the heat absorbing section (26a) of the heat pipe (26), and the temperature is lowered and the oil is cooled. In this way, two P1-pipes (261,
The oil (31) has become cold due to the cooling effect of (2B)
) flows from the second flow path section (23) to the third flow path section (24), and the low temperature oil (31) that has flowed into the third flow path section (24) is pumped by the pump (30c). Intake through suction filter (30a) and piping (30b)
is guided to the spindle system of the machine tool through.

As described above, the heat absorption part (26a) of the heat pipe (26)
side temperature, that is, the second flow path section (23) of the oil tank (20).
) and the heat dissipation part (26bj) of the heat pipe (26).
Cooling by latent heat exchange inside the heat pipe (26) is naturally controlled and continuously performed due to the temperature difference between the temperature on the side, that is, the temperature on the two ambient air sides, and the temperature inside the second flow path section (23) is naturally controlled. This attempts to suppress the rise in oil temperature and bring it closer to the temperature of the surrounding air. When the rise in oil temperature in the second flow path section (23) of the oil tank (20) is suppressed and the temperature becomes the same as that of the surrounding air, latent heat exchange within the heat pipe (26) will not occur (and cooling will occur accordingly). In other words, the amount of heat exchanged by the heat pipe (26) is reduced.

The temperature is proportional to the temperature difference between the oil temperature in the second flow path section (23) of the oil tank (20) and the temperature on the surrounding air side. ) The increase in oil temperature in the second flow path section (23) is also small. Therefore, since the temperature difference between the oil temperature in the second flow path section (23) of the oil tank (20) and the temperature on the ambient air side is small, the amount of heat exchanged by the heat pipe (26) is also small, and the adverse effects of overcooling are also reduced. The cooling amount is naturally controlled and can be continuously cooled in proportion to the amount of heat generated. As a result, the conventional refrigeration compressor (7)
There is no pulsation in the oil temperature due to ON/OFF control of the machine, so there is no pulsation in machining accuracy, and highly reliable machining accuracy can be obtained. Also, oil tank (2o
) is formed into a rectangular ring shape and has a small cross section (25
) of the heat pipe (26) with a larger cross section than the heat absorbing part (2
A first passage section (22) is provided to accommodate the oil (1) so that the hot oil (1) uniformly and rapidly flows into the second passage section (23). A heat pipe (26) is arranged to cool the high-temperature oil (1) in a two-stage configuration, and the third flow path section (24) cools the cooled oil into a low-temperature state. The oil is configured to be rapidly narrowed down to a small suction filter (30a), thereby preventing the flow rate of the oil flowing through the heat absorption part (26a) of the heat pipe (26) from becoming non-uniform.

As a result, oil flows uniformly through the heat absorbing part (26al) of the top pipe pipe 26), resulting in a high cooling effect.

In the above embodiment, the case was described in which the heat pipes were provided at two locations within the second flow path portion of the oil tank, but the heat pipes may be provided at one location or at three or more locations within the second flow path portion of the oil tank. Of course it's a good thing.

Furthermore, in the above embodiment, a case has been described in which the heat radiating device commonly cools the heat radiating parts of two heat pipes. Good too.

The same effects as in the above embodiment are achieved.

Further, in the above embodiment, the oil tank is formed in a square annular shape.
Although the oil tank described above is in the form of a bi-circular ring, the same effect as in the above embodiment can be obtained.

Further, in the above embodiment, a case has been described in which the equipment is a machine tool and oil is supplied to the spindle system, but the equipment may be any equipment as long as oil is supplied, and the same effects as in the above embodiment can be achieved.

〔Effect of the invention〕

As is not explained above, the present invention is such that an oil tank is formed into an annular shape, and a partition member is disposed at one part of the annular part, so that at least three flow path sections from a first flow path section to a third flow path section are formed. form 2
The first flow path section accommodates oil discharged from the equipment in a high temperature state, and the second flow path section.

The heat absorption part of the heat pipe is immersed in the oil in the second flow passage part of the tank, and the heat dissipation part of the heat pipe is arranged outside the oil tank. Installing a heat dissipation device in the heat dissipation part of the pipe j7. By providing a supply means for supplying the oil cooled by the heat pipe and flowing into the third flow path from the second flow path of the oil tank to the equipment, the temperature on the heat absorption side of the exhaust pipe and the temperature of the heat pipe can be adjusted. The temperature is naturally controlled and continuously cooled by the temperature difference between the heat dissipating part and the heat absorbing part of the heat pipe, and the oil is distributed evenly through the heat absorbing part of the heat pipe, providing stable oil without pulsation with a high cooling effect to the equipment. It is possible to obtain a heat exchange device that can be supplied.

[Brief explanation of drawings]

1 and 2 are a side sectional view and a front view showing a heat exchange device according to an embodiment of the present invention, FIG. 3 is a plan view showing an oil tank according to the present invention, and FIG. 4 is a conventional heat exchanger. It is a system diagram showing an apparatus. In the figure, (1) is oil in a high temperature state, (20) is an oil tank, (21) is a partition member, (22) is a first flow path, (23) is a second flow path, and (24) is a third flow path section;
(26) is Bee 1-pipe, (2Ba) is the heat absorption part, (
26b) is a heat radiating part, (28) is a heat radiating device, (30)
is a supply means, and (31) is oil in a low temperature state. Note that the same reference numerals in the two figures indicate the same or equivalent parts.

Claims (4)

[Claims] (1) A device that uses oil, which is formed into an annular shape, and a partition member is arranged at one location of the annular portion to form at least three flow path portions from a first flow path portion to a third flow path portion; an oil tank configured to accommodate the oil discharged from the equipment in a high temperature state in the first flow path section and to sequentially flow the oil into the second flow path section and the third flow path section; A heat absorbing part is immersed in the oil in the second flow path part of the oil tank, and a heat radiating part is arranged outside the oil tank, and the heat of the oil is absorbed by the heat absorbing part, and the heat is transferred to the heat radiating part to radiate the heat. a heat pipe disposed in a heat dissipation section of the heat pipe; and a heat dissipation device disposed in a heat dissipation section of the heat pipe; and a supply means for supplying the inflowing oil to the equipment. (2) The heat exchange device according to claim 1, wherein the heat pipes are provided at two locations in the second flow path portion of the oil tank. (3) The heat exchange device according to claim 2, wherein the heat radiator cools the heat radiating portions of a plurality of heat pipes in common. (4) The heat exchange device according to any one of claims 1 to 3, wherein the equipment is a machine tool.