JPS5810003Y2 - Oil circulation system with oil cooling system - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an improvement of a cooling device called an oil circulation device H6.

BACKGROUND ART Conventionally, an oil circulation system has been used in which an oil tank having an oil filler port sends oil in an oil tank to a hydraulic device using a pump, and the oil from the hydraulic device is returned to the oil tank through a return pipe.

In this type of equipment, the oil fluid may be heated during circulation, which can lead to deterioration of the oil fluid and damage to the equipment, so this type of oil fluid circulation equipment is equipped with a cooling device. It is being

By the way, there are two types of conventional oil cooling devices: water-cooled type and air-cooled type.In both cases, the cooling device body is equipped with a conduit through which the circulating oil liquid passes. In this case, the cooling water should be brought into contact with the outer wall of the conduit.
In the case of an air-cooled type, the configuration is such that air from a fan is applied to the outer wall of the conduit.

However, when using both water-cooled and air-cooled systems, it is necessary to connect a conduit in series before the return of the oil circulation system, so a liquid-tight joint is used to connect the return pipe and the conduit. In addition, when installing an oil cooling device to an existing oil circulation system, it is necessary to cut the return pipe in the middle and connect both pipe ends to the joint. This requires the troublesome work of connecting it to both ends of the conduit of the oil cooling system through the oil cooling system.

Additionally, the installation of the oil cooling system has the inconvenience that the oil circulation system cannot be used during construction or overhaul work.

On the other hand, in recent years, it has become popular to incorporate a rod-shaped sealed container called a heat pipe into which a working fluid is sealed under reduced pressure into the main body of the cooling device. However, since the cooling device main body is provided with a flow path through which the circulating oil liquid passes, and one end of the heat pipe is inserted into this flow path, this oil cooling device can be used as an oil circulation device. In order to apply this method, a liquid-tight joint is required as described above, which may cause oil leakage from the joint.

Further, when installing the oil cooling device to an existing oil circulation device, troublesome work is required, and there is also the inconvenience that the oil circulation device cannot be used during the installation work of the oil cooling device or the period of disassembly and maintenance.

In view of the drawbacks of the conventional devices described above, the present invention eliminates the need for liquid-tight joints and the risk of oil leakage from the joints,
In addition, it is possible to improve cooling performance without adding any special processing to the existing oil circulation system, and it is possible to continue using the oil circulation system during installation or disassembly of the oil cooling system. The purpose of the present invention is to provide an oil circulation device equipped with an oil cooling device that can be used as an oil cooler. One end of the rod-shaped sealed container, which is filled with hydraulic fluid under reduced pressure, is inserted into the nuclear oil tank through the oil filler port provided at the top of the oil tank, and the rod-shaped sealed container is detachable from the fuel filler port. the other end of the rod-shaped airtight container is located outside the oil tank, and a cooling gas flow path having a cooling gas intake and a discharge port is provided around the other end; A feature is that a blower is provided in the middle of the flow path.

An embodiment of the present invention will be described below with reference to the drawings.

Fig. 1 shows the main parts of an oil circulation system equipped with an oil cooling system. A hydraulic pump 4 is installed.

The pump 4 has a suction pipe 5 connected to its suction port inserted below the oil level in the oil tank 1, sucks oil from inside, and releases hydraulic pressure from a discharge pipe 6 connected to the discharge port of the pump 4. It is discharged at high pressure to the equipment side.

Further, a return pipe 7 from the hydraulic equipment side is connected near the bottom of the oil tank 1.

Reference numeral 8 denotes a fuel filler port provided at the top of the oil tank 1 for replenishing the oil liquid into the oil tank 1 and for letting air in and out of the oil tank 1. teeth,
As shown in FIG. 2, a rod-shaped closed container (hereinafter referred to as a heat pipe) is formed by evacuating the inside and sealing the evaporated main liquid as a working fluid inside the container.

) 9 is inserted, and this heat pipe 9
is removably attached to the fuel filler port 8 via a bush 10 made of an elastic material attached to the middle of the heat pipe 9.

The other end of the heat pipe 9 is located outside the oil tank 1.

Here, since there is no risk of oil leakage at the oil supply port 8, there is no need to use a liquid-tight joint to attach the heat pipe 9, and a simple bushing or the like is sufficient.

Note that 11 is a breather pipe inserted into the bush 10.

Reference numeral 12 denotes a cooling gas flow path formed around the other end of the heat pipe 9, and the flow path 12 is formed in an air duct 12A provided around the outer end of the heat pipe 9. It has a cooling gas intake port 12B and a cooling gas discharge port 12C.

Furthermore, spiral fins 13 are attached to the circumferential surface of the heat pipe 9 to increase the heat dissipation area.

Further, an electric motor 14 is attached to the outer periphery of the air duct 12A, and the electric motor 14 is installed in the middle of the flow path 12, that is, near the intake port 12B in the air duct 12A.
A blower 15 that is driven by is installed.

The rotation of the blower 15 causes the air sucked in from the intake port 12B to pass through the flow path 12 in the air duct 12A and be discharged from the discharge port 12C.

In addition, a flexible pipe 16 of arbitrary length is provided at the discharge port 12C.
are connected, and the exhaust can be guided to any location by kneading.

In addition, a heat pipe 9 is inserted under the oil surface of the oil tank 1.
A large number of irregularities 17 are formed on the circumferential surface of the heat pipe 9 by knurling to improve the heat transfer coefficient of the surface of the heat pipe 9.

In addition, a partition wall is provided in the oil tank 1 that extends near the ceiling plate 2 of the oil tank 1 in order to increase the heat exchange rate between the wall surface of the heat pipe 9 inserted below the liquid level in the oil tank 1 and the oil liquid. 1
A is provided, thereby raising the oil level of the oil that comes into contact with the heat pipe 9 and temporarily trapping the returning oil to improve heat exchange with the heat pipe 9.

In the embodiment, the temperature of the oil that returns from the return pipe 7 into the oil tank 1 rises when it performs work on the hydraulic equipment side, and becomes high temperature.

When this high-temperature oil fluid flows into the portion of the oil tank 1 divided by the partition wall 1A, air bubbles are separated while being agitated by the oil jet depending on the inflow speed.

Since the lower end (one end) of the heat pipe 9 is inserted into the oil tank 1 divided by the partition wall 1A, the heat from the fluidized oil is absorbed by the heat pipe 9.

The heat of the oil liquid transferred to the heat pipe 9 reaches the upper part, which is the heat radiation part, with almost no temperature difference due to the cycle of evaporation and condensation of the working fluid inserted inside the heat pipe 9, and the heat pipe 9 reaches the upper part, which is the heat radiation part, with almost no temperature difference. Fin 1 attached to the wall and its outer surface
Heat will be transferred to 3.

When the blower 15 is rotated by the drive of the electric motor 14, the low-temperature indoor air sucked in from the outside swirls along the fins 13 in the duct 12A and rises inside the flow path 12A. Heat exchange is performed, and the air that has undergone heat transfer becomes high temperature and is discharged to the outside through the flexible pipe 16 from the discharge port 12C.

Since this exhaust air is clean, it can be used for any purpose as air for drying, heating, or room heating.

However, if there is no special purpose for using it, it is possible to prevent the room temperature from rising, especially in the summer, by directing it outside and discharging it.

In the embodiments described above, the heat pipe 9 is inserted into the oil tank 1 in a vertical position, so that it does not interfere with the condensation and evaporation cycle of the working fluid inside. By incorporating a so-called wick made of a porous material, the condensed liquid from the cooling gas flow path side can be returned to the oil tank 1 side even if the heat I pipe 9 is inserted in any position.

In addition, the unevenness formed on the outer circumferential surface of the heat pipe inserted into the oil tank 1 is not limited to the case where it is formed by knurling, and screw-shaped protrusions may be provided.
As the fins 13 provided in 2A, in addition to spiral fins, straight fins or the like may be used.

In addition, as in the example, the intake port and the discharge port are connected to the heat pipe 9.
A cooling gas flow path in which the heat pipes 9 are not provided facing each other along the longitudinal direction, but instead is configured to flow perpendicularly to the longitudinal direction of the heat pipe 9, is also included in the flow path of the present invention. be.

Furthermore, the heat pipe 9 is connected to the oil tank 1 by the bushing 10.
Although it was stated that it should be held removably in the fuel filler port 8 of the
For example, a plate material having a larger area than the oil filler port 8 may be fixed to the outer periphery of the heat pipe 9, and the plate material may be placed on the oil filler port 8 to hold the heat pipe 9. The heat pipe 9 may be detachably held in the oil tank 1 by threading rather than by fitting with the bushing 10 as described above.

Regarding the heat pipe 9, although one heat pipe 9 has been described as being disposed inside the air tank 1-12A, it goes without saying that a plurality of heat pipes may be assembled within the range that can be inserted into the fuel filler port.

As is clear from the above description, the present invention involves inserting one end of a rod-shaped airtight container in which hydraulic fluid is sealed under reduced pressure into the oil tank through the oil filler port provided at the top of the oil tank; A rod-shaped airtight container is removably attached to the oil supply port, the other end of the rod-shaped airtight container is located outside the oil tank, and a cooling gas intake and outlet are provided around the other end. The present invention is characterized by providing a flow path for the cooling gas having a cooling gas and a blower provided in the middle of the flow path, so that the following effects are achieved.

■ Since heat exchange is performed by inserting a rod-shaped sealed container into the oil filler port at the top of the oil tank, it is necessary to connect an oil cooling device consisting of a rod-shaped sealed container, a flow path, a blower, etc. in series in the middle of the return pipe. It disappears.

Therefore, there is no need for a liquid-tight joint for connection, and when improving an existing oil circulation system, there is no need to make any side modifications to the existing equipment itself, making the modification work very easy.

Further, there is no problem of oil leakage from the connection portion.

■ When installing an oil cooling device consisting of a rod-shaped sealed container, a flow path, a blower, etc. to an oil fluid circulation system, or when removing it for disassembly and maintenance, etc., the operation of the oil fluid circulation system must be stopped or the circulating oil fluid must be stopped. There is no need to remove it at all.

■ It will be easier to make improvements to improve the cooling capacity of existing equipment that is equipped with an oil cooling device before and during the return of the oil circulation device.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention, and FIG. 2 is an enlarged partial sectional view of FIG. 1. 1...Oil tank, 7...Return pipe, 8.
...Refueling port. 9... Rod-shaped airtight container (heat pipe), 12.
...Flow path, 12B...Intake port, 12C
...Discharge port, 15...Blower.

Claims (1)

[Claims for Utility Model Registration] An oil circulation device that sends oil in an oil tank with an oil filler port at the top to a hydraulic device using a pump, and returns the oil from the hydraulic device to the oil tank through a return pipe. Inserting one end of a rod-shaped sealed container in which hydraulic fluid is sealed under reduced pressure into the oil tank from the oil filler port, and removably attaching the rod-shaped sealed container to the oil filler port; The other end side is located outside the oil tank, and a cooling gas flow path having a cooling gas intake and outlet is provided around the other end side, and a blower is provided in the middle of the flow path. An oil liquid circulation device equipped with an oil cooling device characterized by the following.