JPH0417849Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a device for preventing expansion of a hydraulic container subjected to a constant internal pressure.

(Prior Art) For example, soft plastics are often used in oil tanks that supply oil to hydraulic circuits of machine tools and the like.

On the other hand, in the above hydraulic circuit, repairs, inspections,
Once the oil has been drained for parts replacement, etc., in order to discharge internal air, dirt, etc., the oil is continuously flowed from the oil tank to the end of the hydraulic circuit, and then overflowed from the air bleeder installed in the hydraulic circuit. It is necessary to bleed air.

In this case, in order to reduce air bleeding time and effort, as shown in FIG. 6, the supply port 1a of the oil tank 1 and the hydraulic circuit 2 are connected with a pipe 4.
An oil pressure feeding pipe 6 connected to an oil pressure feeding device (not shown) is attached to the cap 5 of the oil tank 1, and the cap 5 is screwed to the mouth of the oil tank 1, even if the oil is not forced to be fed by the oil pressure feeding device. , if the oil tank 1 is made of soft plastic, it will expand due to the pressure of the oil,
The above pressure feeding is not possible due to the risk of rupture. Therefore, in this case, install the pump 3 in the pipe 4, remove the cap 5, supply oil with the oil can 7, let the pump 3 flow the oil into the hydraulic circuit 2, and install the loosened air bleeder 8. The pump 3 was allowed to overflow until air, dirt, etc. were removed from the pump 3, but rotating with air, dirt, etc. in the pump 3 is inefficient and undesirable in terms of performance maintenance. In addition, the oil pressure does not increase when the pump 3 rotates, and not only is it not possible to remove air and dirt sufficiently, but it often takes a long time to bleed the air. Furthermore, since oil is supplied into the oil tank while air is being bleed, there is a disadvantage that it requires a lot of labor during air bleed.

Therefore, as in the oil filling device shown in Japanese Patent Application Laid-Open No. 59-174496, an oil suction pipe 2 is connected to a pipe 5 communicating with an oil tank 8 via a flow control valve 3, and a leak screw is connected to a vacuum pump 10. 12 in parallel with the air discharge pipe 4,
It is also conceivable to use a system in which the suction pipe 2 and the discharge pipe 4 are connected to the lubrication port of the required equipment via the adapter 13 [the numbers in parentheses are the numbers in the above publication], and furthermore, the applicant of the present application The oil supply device shown in FIG. 7, which was filed as No. 65451, has an insertion tube 9 fitted into the oil supply port 1a' of the oil tank 1, and a spring 10 provided at the tip of the insertion tube 9 to maintain constant pressure. Seal part 1 that tightly covers supply port 1a'
1, a cap 12 connected to the oil tank 1 supporting the insertion tube 9, and an oil supply device 13 connected to the insertion tube 9.

(Problems to be Solved by the Invention) In the invention disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 174496/1983, the air discharge pipe 4 communicating with the vacuum pump 10 is arranged in parallel with the oil suction pipe 2, so the structure is complicated. Not only is it easy to get clogged with dirt, but the vacuum pump 10
It is large-scale and expensive because it requires the above-mentioned soft plastic oil tank, and there is a drawback that vacuum pressure cannot be applied to the oil tank made of soft plastic.

In addition, in the invention of Utility Model Application No. 61-65451, since no internal pressure is applied to the oil tank 1, it can be safely used with an oil tank made of soft plastic. An insertion tube 9 is required, which tends to narrow the range of application, and also makes it difficult to clean the inside of the oil tank.

It is an object of the present invention to solve the above-mentioned problems and provide a liquid container expansion prevention device that prevents the expansion of an oil tank due to pressure feeding of the oil, etc., and has a simple structure that can accommodate fluid containers of various sizes.

(Means for Solving the Problems) The present invention for achieving the above object will be explained with reference to FIGS. 1 and 2, which correspond to embodiments. is attached to hold the liquid container 40 from the outer periphery.

(Function) When performing the air bleeding using the liquid container 40, the liquid container 40 is inserted and held in the fluid pressure tube body 30 installed in the outer case 20,
By keeping the inside of the fluid pressure tube body 30 at a predetermined pressure or by introducing a predetermined pressure, even if pressure is applied to the liquid container 40 during the air removal, the container 40 is suppressed from the outer periphery by the fluid pressure tube body 30. Accidents such as the liquid container 40 expanding and eventually bursting are prevented.

(Example) In FIGS. 1 to 5, 20 is an outer case made of thin steel plate or aluminum, and the horizontal cross section is the third
As shown in FIG. 4, it is formed into a regular square or a circle, and flanges 21 and 22 are formed on the upper and lower sides thereof.

Reference numeral 30 denotes a fluid pressure tube body, which is made of oil- or chemical-resistant rubber or synthetic resin, and has an outer wall 31 that comes into close contact with the inner wall of the outer case 20 when expanded, and an inner wall 32 that comes into close contact with the outer periphery of the liquid container 40 described later. The outer wall 31 and the inner wall 32 are attached to the outer case 20 by clips 33 at a plurality of locations around the circumference. Further, a filler 34 that communicates with the inside is attached to the outer wall 31 of the fluid pressure tube body 30, and is made to protrude through the outer case 20 so that the ring 3
In the case of the one shown in FIG. 1, a predetermined pressure is applied from the filler 34 to the fluid pressure tube body 30.
For example, a fluid having a pressure slightly higher than the pressurized fluid to be applied to the liquid container 40, such as oil or air, is charged, and a plug 36 is pushed into the filler 34 to seal it. Note that the pressure fluid is sealed before or after the liquid container 40 is held in the outer case 20.

In the examples shown in FIGS. 2 to 5, the filler 3
4 is made longer, and a branch pipe 48 from a liquid conduit for feeding into the liquid container 40 is connected to this.

Numeral 40 is a liquid container made of soft plastic similar to the oil tank 1, and is connected to the upper cap 42 of the main body 41.
A pressure pipe 44 and an attached cap 45 are screwed together via a seal 43, and connection ports 46 and 47 to the hydraulic circuit are formed on the bottom surface of the main body.

When air is removed using the expansion prevention device of the present invention configured as described above, as shown in FIG. After being inserted and held inside the tube body 30, the connection port 4
6, 47 are connected to the hydraulic circuit 2 via the pump 3 and directly via the pipes 4, 4', and the pressure pipe 44 is connected via the three-way joint 51 to the oil supply device 53 via the pipe 52. The branch pipe 48 is connected to the three-way joint 51. In addition, 8 is the air bleeder, and 54 is an oil recovery device, and the pipes 55, 5
6, an oil supply device 53 and an air bleeder 8, respectively.
is connected to.

When the air bleeder 8 is loosened and the pump 3 and oil supply device 53 are operated, the oil flows from the oil supply device 53 to the pipe 52 and the three-way joint 51.
The liquid is fed into the liquid container 40 through the pressure pipe 44, and into the liquid pressure tube body 30 from the three-way joint 51 through the branch pipe 48, and the liquid container 4
The outer periphery of the liquid container 40 is pressed with the same pressure as the pressure applied inside the container 40, thereby preventing the liquid container 40 from expanding.

(Effects of the invention) The expansion prevention device of the present invention has a fluid pressure tube attached to the inner wall of the outer case to suppress the liquid container from the outer periphery, so that the liquid container expands from the outer periphery while making it possible to pump the liquid. can be prevented,
In addition, it has the effect of being able to cope with variations in the size of the liquid container, and has a simple structure.

Therefore, liquid can be safely pumped using a soft liquid container, and not only air removal but also flushing can be completed in a short time.

[Brief explanation of the drawing]

1 to 4 show the expansion prevention device of the present invention, FIG. 1 is a longitudinal sectional view of one embodiment, FIG. 2 is a longitudinal sectional view of another embodiment, and FIGS. 3 and 4 are longitudinal sectional views of another embodiment. A in Figure 2
5 shows an oil supply device using the device of the present invention, and FIGS. 6 and 7 show prior examples of the oil supply device. 20... Outer case, 30... Fluid pressure tube body, 31... Outer wall, 32... Internal pressure, 33...
Clip, 34...Filler, 36...Plug, 4
0...Liquid container, 44...Pressure pipe, 45...Cap, 46, 47...Connection port.

Claims (1)

[Claims for Utility Model Registration] (1) A device for preventing expansion of a liquid container, which includes a fluid pressure tube mounted on the inner wall of an outer case to suppress the liquid container from the outer periphery. (2) The device for preventing expansion of a liquid container according to claim 1, wherein the fluid pressure tube body is filled with a fluid at a constant pressure. (3) The device for preventing expansion of a liquid container according to claim 1, wherein the fluid pressure tube body is fed with a pumped liquid.