JPH0438993B2 - - Google Patents

Description

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

[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 ``Mechanical Technology'' (Vol. 29, No. 6, P101, 1981, published by Nikkan Kogyo Shimbun). In the figure, 1 is oil that has been heated to a high temperature by being heated in the spindle system (not shown) of a machine tool, for example, and 2 is oil that has become hot and is discharged from the spindle system of a machine tool. An oil tank 3 stores oil 1 to be heated, and 3 is a pump 5a and 5 that guides oil in the oil tank 2 into a cooling tank 5 through a pipe 4.
b is an outer tank and an inner tank of the cooling tank 5, and oil guided by the pump 3 is introduced between the outer tank 5a and the inner tank 5b, and is introduced into the inner tank 5b from the upper end of the inner tank 5b. 6 is a cooling pipe wound around the outer periphery of the inner tank 5b; 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; A refrigeration system in which a cooling medium that has cooled the oil to a high temperature is introduced through a pipe 8, and supplies the cooling medium that has become low temperature inside to a cooling pipe 6 through a pipe 9, 10 has a cooling tank 5 on one side.
The low temperature oil 11 in the inner tank 5b of the cooling tank 5 is located near the bottom of the inner tank 5b, the other side is connected to the main shaft system of the machine tool, and is cooled by the cooling pipe 6.
12 is a thermostat that detects the oil temperature in the supply pipe 10;
The refrigeration device 7 is turned on and off by a control means (not shown) according to the detection signal of the thermostat 12.
let

Next, the operation will be explained. Oil 1 that has been heated to a high temperature in the spindle system of a machine tool
is discharged into the oil tank 2. The oil stored in the oil tank 2 is introduced between the outer tank 5a and the inner tank 5b of the cooling tank 5 by the pump 3, and is introduced into the inner tank 5b from the upper end of the inner tank 5b. The oil 11, which has been cooled by heat exchange through the cooling pipe 6 wound around the outer circumference of the inner tank 5b and has reached a low temperature, is supplied to the main shaft system of the machine tool 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 and is supplied to the cooling pipe 6 again as a low-temperature cooling medium. Furthermore, 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 device 7 is turned on, it is in a cooling operation, and the refrigeration device 7 supplies a certain amount of low-temperature cooling medium to the cooling pipe 6 to drain the oil in the inner tank 5b of the cooling tank 5. Forced cooling. In addition, if the amount of heat generated on the machine tool side is small, the amount of cooling by the refrigeration device 7 becomes excessive, resulting in excessive cooling.The refrigeration device 7 is temporarily turned off to stop operation, and when the oil temperature rises, the refrigeration device 7 is turned off again. Turn it on and run the cooling operation.

[Problems to be solved by the invention] However, in the above-mentioned conventional heat exchange device,
Since the oil temperature is controlled by turning the refrigeration device 7 ON and OFF, the supply piping 10
There is a problem in that pulsations occur in the temperature of the oil 11 passing through. 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 pulsations in the oil temperature of the oil 11 directly lead to pulsations in machining accuracy. Furthermore, when the device is started up, the oil in the oil tank 2 is cooled in the cooling tank 5 and supplied to the main spindle system of the machine tool from the supply pipe 10, and the oil in the oil tank 2 is cooled before being returned to the oil tank 2. Since the amount of oil in 2 is significantly reduced, a large oil tank 2 is required to secure the amount of oil.

This invention was made to solve the above-mentioned problems, and an object thereof is to obtain a heat exchange device that does not cause pulsation in oil temperature.

[Means for solving problems]

In the heat exchange device according to the present invention, the oil tank is formed in an annular shape, and a partition member is disposed at one place in the annular part, so that at least three of the first flow path section to the third flow path section are separated.
the oil discharged from the equipment in a high temperature state is accommodated in the first flow path section, and is configured to sequentially flow into the second flow path section and the third flow path section;
The heat absorbing part of the heat pipe is immersed in oil in the second flow path part of the oil tank, the heat radiating part of the heat pipe is placed outside the oil tank, and a heat radiating device is arranged in the heat radiating part of the heat pipe. A supply means is provided for supplying the cooled oil that has flowed from the second flow path portion of the oil tank into the third flow path portion to the equipment, and An oil amount adjustment section is provided that communicates with either of the sections.

[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 of the oil tank flows into the second flow path, flows through the heat absorbing portion of the heat pipe, flows into the third flow path, and further flows into the third flow path when the device is started. The oil in the oil amount adjustment section flows into any of the first, second, and third flow paths of the oil tank to replenish the oil amount, resulting in a stable, pulsating, and highly effective cooling system. Oil 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. Figure 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 such as a main shaft system (not shown) of a machine tool that heats the
The oil 20 that has been heated to a high temperature is formed into, for example, a rectangular ring shape, and a partition member 21 is disposed at one location of the annular portion to separate the first flow path portion 22, the second flow path portion 23, The third flow path portion 24 is formed in three flow path portions, and the second flow path portion 23 is formed in three flow paths 23a, 23.
b, 23c, and the oil 1 discharged from the main shaft system of the machine tool in a high temperature state is transferred to the first flow path section 22.
This is an oil tank configured to house the oil in the oil tank and to sequentially flow the oil into the second flow path section 23 and the third flow path section 24. 2
Reference numeral 5 denotes an oil amount adjusting section that communicates with, for example, the flow path 23b of the second flow path section 23 of the oil tank 20, and when the device is started, the oil stored in the oil amount adjusting section 25 is transferred to the second flow path of the oil tank 20. The oil flows into the flow path 23b of the path portion 23 to supplement the oil amount. 26 is oil 1 discharged from the main shaft system of the machine tool in a high temperature state.
27 is a flow path 23a and a flow path 23c of the second flow path portion 23 of the oil tank 20.
It is a heat pipe in which heat absorbing parts 27a, 27a are immersed in respective oils inside the tank, and heat radiating parts 27b, 27b are respectively arranged outside the oil tank 20, that is, in the surrounding air. A predetermined amount of a working liquid 28 such as ammonia or the like is sealed, and the heat of the oil is absorbed by the heat absorbing parts 27a, 27a, and the heat is transferred to the heat radiating parts 27b, 27b to radiate the heat. 2
9 is, for example, the heat dissipation part 27 of the heat pipes 27, 27.
This is a heat dissipation device disposed to commonly cool the components 27b and 27b, and the figure shows, as an example, a case of a heat dissipation fan. 30 is an air filter,
Reference numeral 31 denotes a supply means for supplying the oil 32, which has been cooled by the heat pipes 27 and 27 and is in a low temperature state and has flowed from the second flow path section 23 to the third flow path section 24, to the main shaft system of the machine tool. 3rd of tank 20
A suction filter 31a disposed within the flow path section 24, a pipe 31b connecting the suction filter 31a and the main shaft system of the machine tool, and an oil 32 disposed in the pipe 31b that is in a low temperature state.
and a pump 31c for taking in the water through a suction filter 31a and guiding it to the main shaft system of the machine tool.

Next, the operation will be explained. Oil 1 that has been heated to a high temperature in the spindle system of a machine tool
is discharged into the first flow path section 22 of the oil tank 20. The high-temperature oil 1 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 passes through the heat absorption section 27a of the heat pipe 27. The part 27a is heated, and this heating also heats the working liquid 28 sealed therein, which absorbs heat from the oil as latent heat of vaporization, vaporizes it, and moves to the heat radiation part 27b side of the heat pipe 27 inside. The vapor of the working liquid 28, such as fluorocarbon, which has moved to the heat radiation part 27b side of the heat pipe 27 is cooled by the surrounding air by the radiation fan 29. At this time, the vapor of the working liquid 28 such as fluorocarbon is condensed and liquefied, but the latent heat of condensation is released to the surrounding air, and the heat of the oil is radiated to the surrounding air. The condensed and liquefied working liquid 28 moves inside the heat pipe 27 toward the endothermic section 27a and returns thereto. In this way, by repeatedly vaporizing and liquefying the working liquid 28 in the heat pipe 27, the heat pipe 27
The heat of the high-temperature oil 1 passing through the heat absorption part 27a of the heat pipe 27 is transferred from the heat absorption part 27a of the heat pipe 27 to the heat radiation part 27b of the heat pipe 27, and is radiated to the surrounding air. Therefore, the heat of the high-temperature oil 1 that has flowed into the flow path 23a of the second flow path portion 23 of the oil tank 20 is absorbed by the heat absorbing portion 27a of the heat pipe 27, and the temperature is lowered and the oil 1 is cooled. This cooled oil flows through the second flow path section 23.
flows into the flow path 23b, and further flows into the second flow path 23b.
It flows into the flow path 23c of the heat pipe 27, passes through the heat absorption part 27a of the heat pipe 27, and at this time heats the heat absorption part 27a of the heat pipe 27. This heating also heats the working liquid 28 sealed inside, and the oil The heat is taken away as latent heat of vaporization and evaporated into heat pipe 2.
7 inside toward the heat dissipation part 27b side. The vapor of the working liquid 28, such as fluorocarbon, which has moved to the heat radiation section 27b side of the heat pipe 27 is cooled by the surrounding air by the radiation fan 29. At this time, the vapor of the working liquid 28 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. The condensed and liquefied working liquid 28 moves inside the heat pipe 27 toward the endothermic section 27a and returns thereto. In this way, by repeating vaporization and liquefaction of the working liquid 28 in the heat pipe 27, the heat of the oil passing through the heat absorption part 27a of the heat pipe 27 is transferred from the heat absorption part 27a of the heat pipe 27 to the heat radiation part of the heat pipe 27. The heat is transported to 27b 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 portion 23 is absorbed by the heat absorbing portion 27a of the heat pipe 27, and the temperature is lowered and the oil is cooled. The oil 32, which has reached a low temperature in the second flow path section 23 of the oil tank 20 due to the cooling action of the two heat pipes 27, is then transferred to the second flow path section 23 of the oil tank 20.
The oil 32 that has entered the third flow path section 24 from the flow path section 23 and has reached a low temperature is passed through the suction filter 31a by the pump 31c.
It is taken in through the pipe 31b and guided to the main shaft system of the machine tool. Furthermore, even if the amount of oil in the oil tank 20 decreases when the device is started, the oil in the oil amount adjustment section 25 flows into the flow path 23b of the second flow path section 23 of the oil tank 20 to compensate.

As described above, the heat absorption part 27a of the heat pipe 27
side temperature, that is, the second flow path section 23 of the oil tank 20
Cooling by latent heat exchange inside the heat pipe 27 is naturally controlled and continuously performed due to the temperature difference between the oil temperature inside the heat pipe 27 and the temperature on the heat radiation part 27b side of the heat pipe 27, that is, the temperature on the ambient air side. , attempts to suppress the rise in oil temperature in the second flow path section 23 and bring it closer to the temperature on the ambient air side. When the rise in oil temperature in the second flow path section 23 of the oil tank 20 is suppressed and becomes similar to the temperature on the ambient air side, latent heat exchange within the heat pipe 27 will no longer occur, and accordingly, no cooling action will occur. That is, the amount of heat exchanged by the heat pipe 27 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 ambient air side, and the amount of heat generated on the machine tool side is If the amount is small, the rise in oil temperature within the second flow path section 23 of the oil tank 20 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 27 is also small, and there is no harm caused by overcooling, and it is commensurate with the amount of heat generated. The cooling amount is naturally controlled and can be continuously cooled. As a result, there is no oil temperature pulsation caused by ON/OFF control of the refrigeration device 7 as in the past, and therefore there is no pulsation in machining/processing accuracy, resulting in highly reliable machining accuracy. . In addition, the oil tank 20 is formed into a rectangular annular shape, and the heat absorbing part 27a of the heat pipe 27 has a larger cross section than the return pipe 26 which has a smaller cross section.
1 so that the hot oil 1 uniformly and rapidly flows into the first
A flow path section 22 is provided to accommodate the oil 1, and a heat pipe 2 is installed at two locations in the second flow path section 23.
7 is arranged to cool the high-temperature oil 1 in a two-stage configuration, and the third flow path section 24 rapidly narrows the cooled oil to a low-temperature state to a suction filter 31a with a small cross section. This structure prevents the flow rate of oil flowing through the heat absorbing portion 27a of the heat pipe 27 from becoming non-uniform. As a result, oil flows uniformly through the heat absorbing portion 27a of the heat pipe 27, resulting in a high cooling effect.
Furthermore, even if the amount of oil in the oil tank 20 decreases when the device is started up, the oil in the oil amount adjustment section 25 is
It flows into the flow path 23b of the flow path portion 23 and is supplemented.

In the above embodiment, a 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 were provided at one location within the second flow path portion of the oil tank.
Of course, it may be provided at one location or at three or more locations.

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. The same effect as in the above embodiment can be obtained.

Further, in the above embodiment, a case has been described in which the oil tank is formed in a rectangular annular shape, but the oil tank may be formed in a circular annular shape, and the same effects as in the above embodiment can be obtained.

Further, in the above embodiment, the case where the oil amount adjustment section communicates with the second flow path section of the oil tank has been described, but the oil amount adjustment section communicates with at least the first flow path section and the second flow path section of the oil tank.
It is sufficient that it communicates with either the flow path section or the third flow path section, or it may communicate with all of them.

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 explained above, the present invention forms an oil tank in an annular shape, and arranges a partition member at one place in the annular part, so that at least three of the first flow path part to the third flow path part are
the oil discharged from the equipment in a high temperature state is accommodated in the first flow path section, and is configured to sequentially flow into the second flow path section and the third flow path section;
The heat absorbing part of the heat pipe is immersed in oil in the second flow path part of the oil tank, the heat radiating part of the heat pipe is placed outside the oil tank, and a heat radiating device is arranged in the heat radiating part of the heat pipe. A supply means is provided for supplying the cooled oil that has flowed from the second flow path portion of the oil tank into the third flow path portion to the equipment, and By providing an oil volume adjustment section that communicates with either section, the temperature is naturally controlled and continuously cooled by the temperature difference between the temperature on the heat absorption section side of the heat pipe and the temperature on the heat radiation section side of the heat pipe. In addition, the oil flows uniformly through the heat absorption part of the heat pipe, and even if the oil volume in the oil tank decreases when the device is started, it can be compensated for by the oil in the oil volume adjustment part, resulting in a stable and pulsating cooling system with high cooling effect. A heat exchange device capable of supplying oil to equipment can be obtained.

[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 high-temperature oil, 20 is an oil tank, 21 is a partition member, 22 is a first flow path section, 23 is a second flow path section, 24 is a third flow path section, and 25 is an oil amount adjustment section. , 27 is a heat pipe, 27a is a heat absorption part, 27
b is a heat radiation part, 29 is a heat radiation device, 31 is a supply means,
32 is oil in a low temperature state. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. A device that uses oil, and at least three flow path sections from a first flow path section to a third flow path section, which are formed in an annular shape and have a partition member disposed at one location of the annular section. The oil is configured such that the oil, which is discharged from the equipment in a high temperature state, is accommodated in the first flow path section and sequentially flows into the second flow path section and the third flow path section. a tank, and an inner wall portion of the second flow path portion and the heat absorption portion so that the heat absorption portion is immersed in the oil in the second flow path portion of the oil tank, and the oil and the heat absorption portion are brought into reliable thermal contact. A heat dissipation part is arranged outside the oil tank,
A heat pipe that absorbs the heat of the oil in the heat absorption part and transports the heat to the heat radiation part to radiate the heat, a heat radiation device disposed in the heat radiation part of this heat pipe, and a heat radiation device that absorbs the heat of the oil by the heat pipe. A supply means for supplying oil flowing into the third flow path of the oil tank from the second flow path of the oil tank to the equipment; 1. A heat exchange device comprising: an oil amount adjusting section provided in communication with any of the three flow path sections. 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 oil amount adjustment section is provided in communication with the second flow path section of the oil tank. 5. The heat exchange device according to any one of claims 1 to 4, wherein the equipment is a machine tool.