JPS58133590A - Tank with built-in heat exchanger - Google Patents

Abstract

PURPOSE:To enable to miniaturize a tank itself, by streaming a fluid having an unfavourable heat conductivity to a fin part by making use of a cross fin heat exchanger as a built-in heat exchanger, in a hydraulic oil tank for a machine tool. CONSTITUTION:Oil having unfavourable thermal conductivity returned to the bottom part of an oil tank 10 from a machine tool 3 flows upward, which is cooled through heat exchange with a coolant flowing within a cross fin heat exchanger 11, the oil reached to the upper stream is overflowed the tops of side plates 11B and 11C and fed to the machine tool 3 through pressure by a circulation pump 2 from the lower part of the oil tank 10. In this manner, as the returned oil is circulated over contact with fins 11A of the cross fin heat exchanger 11, a heat transfer area of an oil side can be secured on a large scale, a velocity of flow of the oil is secured appropriately through the side plates 11B and 11C, heat transfer performance is made to improve and the tank itself can be miniaturized.

Description

[Detailed description of the invention] +: The invention includes a heat exchanger inside, and a fluid with a good heat transfer coefficient flows inside the heat exchanger, and a fluid with a poor heat transfer coefficient flows outside the heat exchanger. "Tack yarn Q1 for heat exchange" relates to a tank with a built-in heat exchanger suitable for use, particularly when hydraulic oil or lubricating oil of machine tools, etc. is cooled by refrigerant of a refrigerator.

Figure dX1 shows a system diagram in which hydraulic oil or lubricating oil of a machine tool is cooled by refrigerant of a refrigerator using a conventional heat exchanger 4 built-in tank.

In the figure, one refrigeration system is formed by a compressor 4, a condenser 5, a capillary nap 7, and a cooling coil 8. I'll in Manen Machine Tool 3:jI! 7. An oil system path for oil or lubricating oil (hereinafter simply referred to as oil) is formed by an oil tank 1 containing the cooling coil 8, and a circulation valve 2, and is used to carry the oil in the oil tank 1. The cooling coil 1 cools the oil, and the cooled oil is sent to the machine tool 3 through the circulation bog 2 Q1
It will now return to oil tack 1 again.

As is well known, the heat transfer coefficient of oil is extremely lower than that of refrigerant, so the heat transfer area on the oil side must be made small, but generally a bare tube is used for the cooling coil 8. For this reason, the tube length is increased to increase the surface area.

However, if the -tt* width of the cooling coil 8 is increased too much, the performance of the Q1 refrigerator, which suffers from a large pressure loss on the refrigerant side, will deteriorate. If the flow velocity on the refrigerant side is reduced by increasing the diameter of the cooling coil 8, the pressure loss on the refrigerant side will be reduced. The air will not return to the compressor 4, which may cause an accident with the compressor 4.

In some cases, a high-fin chive is used as the coil 8, but it is difficult to wind it into a coil, and a great effect cannot be obtained.

Therefore, in the conventional tank with a built-in heat exchanger, a stirrer 9 is provided in the oil tank 1 as shown in the figure, and the stirrer 9 stirs the oil to increase the speed of the oil on the surface of the cooling coil 8, thereby reducing heat transfer performance.
The current situation is to prevent this.

However, installing the agitator 9 complicates the structure of the oil tank 1, that is, the tank with a built-in cold F4 unit, and increases costs. Further, electric power is required for the agitator 9, and the motor output of the agitator 9 is released as heat into the oil tank 1, which is negative in terms of energy saving.

An object of the present invention is to provide a tank with a built-in heat exchanger that solves the problems of the prior art, has a simple structure, is inexpensive, and can save energy.

In order to achieve this object, the present invention includes a heat exchanger inside, a fluid with a good heat transfer coefficient flows inside the heat exchanger, and a fluid with a poor heat transfer coefficient flows outside the heat exchanger. In a tank with a built-in heat exchanger that exchanges heat between both fluids, the heat exchanger is a cross-fi/forming heat exchanger #1jI! The cross-fin type heat exchanger is characterized in that a flow path is formed surrounding the fin portion of the cross-fin type heat exchanger, and a fluid having a poor heat transfer coefficient flows from one side of the flow path to the other. do.

The details of the present invention will be explained below with reference to the drawings.

Figure 2 is a tank with a built-in S&Juki device according to the present invention? A system diagram is shown in which the oil in a machine tool is cooled by the refrigerant in a refrigerator using the I-. In the figures, the same reference numerals as in FIG. 1 represent the same or equivalent items. The tank with built-in oil exchanger according to the invention uses a cross-fin type heat exchanger 11 as a heat exchanger provided inside the oil tank 10.

The cross-fin type heat exchanger 11 has side plates 11B and 11C that are longer than the fins IIA on both sides, and the lower end surfaces of the side plates 11B and IIC are attached to the bottom wall of the oil tank 10.
In addition, by joining the side end surfaces to the 1tui of the oil tank 10, the oil tank 10 is mounted in a floating state from the bottom of the oil tank 10. Thus, an oil flow path 12 extending from the bottom to the top is formed in a portion surrounded by the side plates 11B and 11C.

However, in the tank with a built-in heat exchanger according to the present invention, the oil returned from the machine tool 3 to the bottom of the oil tank 10 is
The refrigerant flows through the flow path 12 from below to above, and in the process is cooled by exchanging heat with the refrigerant flowing inside the cross-fin heat exchanger 11. The oil that has cooled and reached the upper part of the flow path 12 overflows from the upper end of the side plate 11B and the IIC, and is then sucked in by the circulation bong 2 from the lower part of the oil tank 10 and is then pumped to the machine tool 3. Therefore, the cooled oil returned to the oil tank 10 circulates while contacting the 71 holes 11A of the cross-fin type heat exchanger 11, so the heat transfer area on the oil side is much larger than that of conventional bare tubes or high-fin tubes. will be largely secured.

Further, the flow path 12 is connected to the side plate 118 of the cross fin type heat exchanger 11. Since it is formed by IIC, an appropriate oil flow rate is ensured, and heat transfer performance is greatly improved.

In the above-mentioned embodiment, the oil is configured to flow from the bottom to the top of the flow path 12, but it may be configured to flow from the top of the flow path 12 to the bottom. Also side plate 1
It is also possible to install one or more partition plates between 1B and 11C to allow waste oil to flow in a meandering manner, and in this way, the cooling effect of the oil can be further improved.

As explained above, the tank with a built-in heat exchanger of the present invention uses a cross-fin type heat exchanger as its heat exchanger, and forms a flow path for a fluid with poor heat transfer coefficient in the fin portion. With this configuration, a large heat transfer area for the fluid can be ensured, thereby making it possible to downsize the Q tank itself. Furthermore, since a stirrer as in the prior art is not required, the structure can be simplified and manufacturing costs can be significantly reduced.

Furthermore, since no electricity is required for the stirring bales, energy savings can be achieved.

[Brief explanation of the drawing]

Figure 1 is a system diagram of a case in which a conventional tank with a built-in heat exchanger is used to cool machine tool oil with the refrigerant e-koyo-Q of a refrigerator, and Figure 2 is a system diagram in which a tank with a built-in heat exchanger according to the present invention is used. A system diagram is shown in which oil in a machine tool is cooled by using a refrigerant in a refrigerator. 10...Oil tank 11...Cross fin heat exchanger +1A...Fin lIB, 11c...
Side plate 12... Channel agent Patent attorney Usui 1) Toriyuki 1.2゜r
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Claims (1)

[Claims] internal? A tank V with a built-in heat exchanger is equipped with a heat exchanger, and a fluid with a good heat transfer coefficient is flowed inside the heat exchanger, and a fluid with a poor heat transfer coefficient is flowed outside the heat exchanger to exchange heat between the two fluids. , a cross 717 type heat exchanger is used as the heat exchanger, and a flow path is formed surrounding the fin portion of the cross 74 type heat exchanger, and the flow path is directed from 10,000 to the external force. A vent/tub with a built-in heat exchanger characterized in that it is configured so that a fluid with poor heat transfer coefficient can flow therethrough.