JP2530140Y2 - Oil temperature controller - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil temperature controller equipped with an oil cooler including a refrigerant compressor, a condenser and a cooler in a housing having an oil inlet and an oil outlet.

[0002]

2. Description of the Related Art Hydraulic oil used for hydraulic devices such as plastic injection molding machines and various machine tools, cutting or grinding oil used for machine tools or electric discharge machines,
Alternatively, lubricating oils and the like used in various machine lubrication devices are used to avoid various troubles due to generation of heat, which is an obstacle in improving the processing accuracy and operation rate of the machine to be used. There is a demand that the oil temperature must be properly controlled.

Conventionally, for example, thermal displacement of a spindle of a machine tool,
2. Description of the Related Art Oil temperature controllers are used for controlling hydraulic oil temperature, cooling lubricating oil, and controlling the temperature of cutting / grinding oil (liquid) for the purpose of suppressing a change in viscosity of hydraulic oil or thermal deformation of a work.
This conventional oil temperature controller is equipped with an oil cooler including a refrigerant compressor, a condenser, and a cooler in a housing having an oil inlet and an oil outlet. The oil temperature is adjusted by circulating the oil.

[0004]

However, in these target machines, when particulate matter such as metal powder generated in the oil system during use enters the oil, the concentration thereof gradually increases. Failures occur in the machine itself and in the internal pumps and valves of the temperature controller, leading to troubles such as machine stoppages and malfunctions, poor machining accuracy due to incorrect positioning by hydraulic actuators, and product scratches. Will occur. Regarding the oil temperature controller itself, even if a trochoid pump that is resistant to oil contamination is used as its internal pump, the pump gradually malfunctions as the contamination concentration increases, and contaminants adhere to the oil cooler cooling pipe. As a result, excessive cooling by the oil cooler is caused by the decrease in flow rate, and as a result, the oil temperature at the outlet of the oil temperature controller becomes abnormally low, and moisture in the air condenses in the pipeline,
This causes a problem that the oil is mixed into the oil and causes deterioration of the oil and failure of each part in the device.

Conventionally, these contaminants are generally removed by interposing a line filter in the oil flow path, and therefore, the oil inlet of the hydraulic system of the target machine and the oil of the oil temperature controller are generally used. Contaminated oil can be purified by interposing line filters at the inlet and the inlet, respectively.In this case, the line filters are installed individually, so the number of pipes increases and the total amount of oil passing through the flow path is reduced. Since filtration is performed by a filter, the pressure loss of the filter must be considered in order to secure a required flow rate. As a result, there is a drawback that it is difficult to capture fine particles.

[0006] The present invention is intended to solve the above-mentioned problems of the prior art, and removes moisture in oil together with contaminants in oil, thereby causing failure of the target machine and internal equipment of the oil temperature controller itself. The purpose of the present invention is to provide an oil temperature controller capable of adjusting the oil temperature with a relatively small flow rate of a built-in pump while maintaining a high level of cleanliness as high as that of new oil or higher. is there.

[0007]

That is, the oil temperature controller of the present invention is provided with an oil cooler including a refrigerant compressor, a condenser and a cooler in a housing having an oil inlet and an oil outlet. A pump that constantly discharges oil from the oil inlet and feeds the oil to the oil outlet via the cooler, and a bypass device that bypasses a part of the oil flowing from the discharge port of the pump to the cooler. And an exchangeable filter means for removing the contaminants in the oil and the moisture in the oil by filtering the oil bypassed .

[0008]

In one embodiment of the present invention, the bypass means includes a venturi device provided in a communication pipe between the pump and the cooler, and the communication pipe upstream of the venturi apparatus. A branch pipe for branching and guiding a part of the oil to the filter means, wherein the partial oil shunted from the communication pipe by the branch pipe is suctioned by the venturi apparatus through the filter means. It is configured to merge from the end into the conduit to the inlet of the cooler.

In another aspect of the present invention, the bypass means includes a branch pipe for branching a communication pipe between the pump and the cooler to guide a part of oil to the filter means.
A merging line for merging the outlet of the filter means into a line between the outlet of the cooler and the oil outlet, and a downstream side of the branch point for determining a branch flow ratio at a branch point of the branch line. Throttle means provided in at least one of the conduits.

[0011]

The oil temperature controller according to the present invention continually circulates the oil in the oil tank of the target machine to the cooler of the oil cooler through the oil inlet and the oil outlet to perform oil temperature adjustment and filter processing. It is what you do. That is, the oil from the oil inlet is constantly sent out to the oil outlet via the cooler by the pump, and in the cooler, heat is taken by the refrigerant and cooled. The refrigerant vaporized by the heat absorption is liquefied as usual by the compressor and the condenser of the oil cooler and circulated to the heat absorption pipe of the cooler.

Further, in the present invention, a part of the oil which is subjected to the oil temperature adjustment is bypassed by the bypass means in a pipeline from the discharge port of the pump to the cooler, and is bypassed by the bypass means. The filtered oil is constantly filtered by the filter means, thereby removing contaminants in oil and water in oil. This filter means is replaceable, and for example, a filter element having a microstructure made of spunbonded cellulose nonwoven short fibers capable of absorbing and retaining water and containing no binder is used.

Thus, in the oil temperature controller of the present invention, the passing oil is controlled to a desired temperature by the oil cooler, and a part of the oil is filtered by the filter to remove contaminants and moisture in the oil, which is a steady discharge of the pump. It is performed by continuous oil circulation by operation. It is the bypass means that passes a part of the passing oil through the filter means, which is performed at a predetermined flow ratio by a venturi device or a combination of a branch pipe and a throttle means. Variable adjustment is also possible.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a structural view showing a first embodiment, wherein a housing 1 is provided with an oil inlet 2 and an oil outlet 3, and the oil inlet 2 is provided. Trochoid pump 4 and Venturi pipe 5
And a cooler 6. An outlet of the cooler 6 is connected to the oil outlet 3. Copper pipes are generally used to connect these oil passages.
Since copper pipes are incompatible with grinding oil, stainless steel pipes are preferably used to make them adaptable to any oil use.

The trochoid pump 4 has a parallel relief valve 7 which bypasses the pump if its pressure loss exceeds a set limit. A branch pipe 9 is branched from between the discharge port of the trochoid pump 4 and the inlet of the venturi pipe 5, and a filter 10 is connected to the tip of the branch pipe 9, and the outlet of the filter 10 is connected to the suction port of the venturi pipe 5. It is connected to the.

Inside the casing 1, a compressor 11, which constitutes an oil cooler together with the cooler 6, a condenser 12,
A dryer 13 is provided, and the space between them is connected by a refrigerant circulation tube. In this oil cooler, the refrigerant pressurized by the compressor 11 is cooled and liquefied by the fan 14 in the condenser 12, and when the refrigerant reaches the heat absorbing tube of the cooler 6 via the dryer 13, the refrigerant expands.
The heat of the oil flowing through the inside of the cooler 6 is vaporized, and the vaporized refrigerant returns to the compressor 11 and is pressurized again. Operation control of the compressor 11 is performed by temperature control by the thermostat 15 based on the oil temperature at the inlet of the cooler 6. Reference numeral 16 in the drawing denotes a high-voltage switch for detecting the outlet pressure of the compressor 11 to turn the operation on and off.

Now, when the oil inlet 2 and the oil outlet 3 are connected to an oil tank, which is a hydraulic source of a target machine (not shown), the oil cooler is set to a certain cooling temperature to be operated, and the trochoid pump 4 is operated. Then, oil is sucked into the pump 4 from the oil inlet 2 and flows through the internal pipeline.

When the oil discharged from the trochoid pump 4 passes through the Venturi tube 5, a negative pressure is generated in the Venturi portion inside the Venturi tube, and the oil on the output side of the filter 10 is sucked into the pipeline by the negative pressure. . The filter 10 has a branch pipe 9
, A part of the oil on the inlet side of the venturi tube 5 is guided. Therefore, from the outlet of the venturi tube 5, the oil passing through the venturi tube 5 and the oil purified by the filter 10 merge. Come out. In this case, the ratio between the two can be determined by selecting the suction rate of the venturi tube 5.

As described above, the filter 10 includes a microstructured filter element made of spunbonded cellulose non-woven fabric short fibers capable of absorbing and retaining water without a binder, as described above. Moisture in the oil is captured together with various contaminants. The filter element may be replaced periodically after an appropriate period, and a pressure gauge 8 for measuring the pressure at the inlet of the filter is provided by a visual or audible display in order to grasp the replacement time by clogging of the filter. An alarm may be issued.

The oil joined by the venturi pipe 5 enters the cooler 6 after its temperature is measured by the thermostat 15, where it is cooled by the refrigerant and sent to the oil outlet 3.

When such an operation is continuously performed on the oil tank of the target equipment and the oil in the oil tank is circulated through the oil temperature controller, the oil in the oil tank undergoes sufficient temperature adjustment and It is also subject to regular filter processing,
Even with a relatively small filter, a sufficient cleaning effect can be obtained, and the oil in the oil tank can always be maintained at a cleanliness level equal to or higher than that of the new oil. Incidentally, depending on the operating conditions of the target machine, a plurality of oil temperature regulators according to the present invention may be installed in parallel in the oil tank.

FIG. 2 shows a second embodiment of the present invention.
The same parts as those in the first embodiment are denoted by the same reference numerals as those in FIG. The second embodiment shown in FIG. 2 differs from the first embodiment in the branch pipe and the insertion portion of the filter. That is, in FIG. 2, the branch pipe 1 is connected to the outlet of the trochoid pump 4 beyond the position where the thermostat 15 is disposed without being connected to the venturi pipe.
9, a throttle 21 is provided on the side of the cooler 6 downstream of the branch point of the branch pipe 19, and a filter 20 is provided downstream of the branch pipe 19 via another throttle 22. The outlet of 20 is connected directly to the outlet of the cooler 6.

The operation of the second embodiment will be described. The oil discharged from the trochoid pump 4 is
Via the throttle 21 to one of the coolers 6
And the other is guided to the filter 20 through another restrictor 22, and the oil coming out of the filter 6 joins at the outlet of the cooler 6 to reach the oil outlet. In this case, the split ratio between the oil flowing to the cooler 6 and the oil flowing to the filter 20 is determined by the throttles 21 and 22.
Are appropriately set, and these diaphragms can be constituted by fixed diaphragms or variable diaphragms.

[0024]

As described above, in the oil temperature controller of the present invention, the oil in the oil tank of the target machine is constantly circulated to the cooler of the oil cooler via the oil inlet and the oil outlet. To perform oil temperature adjustment and filter processing.
For example, it is possible to use a small-sized filter by appropriately setting the split ratio, and to provide a function that can simultaneously achieve oil temperature control and contamination control by operating the small-sized filter continuously in continuous circulation. And
The oil in the oil is removed by a filter together with the oil contaminants, thereby effectively preventing oil contamination which may cause a failure in the target machine and the internal equipment of the oil temperature controller itself, and at the same time as a new oil or higher. The oil temperature can be adjusted with a relatively small flow rate of the built-in pump while maintaining the level of cleanliness.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a second embodiment of the present invention.

[Explanation of symbols]

 1: Case 2: Oil inlet 3: Oil outlet 4: Trochoid pump 5: Venturi tube 6: Cooler 9: Branch tube 10, 20: Filter 21, 22: Restrictor

Claims (2)

(57) [Scope of request for utility model registration] 1. An oil temperature controller equipped with an oil cooler including a refrigerant compressor, a condenser, and a cooler in a housing having an oil inlet and an oil outlet, wherein the oil from the oil inlet is constantly discharged. A pump for sending out to the oil outlet through the cooler, a bypass means for bypassing a part of the oil flowing from the discharge port of the pump to the cooler, and filtering the bypassed oil. Replaceable filter means for removing contaminants in oil and moisture in oil;
Wherein the bypass passage means, communicating between said condenser and said pump
A venturi device provided in the pipeline, and the venturi device;
The communication line is branched on the upstream side of the device to form the filter.
A branch line for leading a part of oil to the means, and the branch line is separated from the communication line by the branch line.
Some oil through the filter means to the venturi
From the suction end of the device to the line to the inlet of the cooler
An oil temperature controller characterized by the following. 2. A refrigerant in a housing having an oil inlet and an oil outlet.
Equipped with oil cooler including compressor, condenser and cooler
In the oil temperature controller, the oil is constantly discharged from the oil inlet and is discharged through the cooler.
Pumping the oil to the oil outlet and discharging the pump
Bypasser for bypassing part of the oil flowing from the mouth to the cooler
Steps and contaminants in oil by filtering the bypassed oil
Replaceable filter means for removing matter and oil moisture
Wherein the bypass passage means, communicating between said condenser and said pump
A portion for branching the pipe and guiding some oil to the filter means
A branch and an outlet of the filter means to an outlet of the cooler
A merging line for merging with a line between the oil outlet and the oil outlet;
To determine the branch flow ratio at the branch point of the branch pipeline
Provided in at least one pipe downstream of the branch point
An oil temperature adjuster comprising a throttle means .