JPH0426400Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention can be used, for example, when injecting coolant into an automobile engine coolant circulation system, when injecting oil into a power steering device, or when injecting brake fluid into a hydraulic brake device, etc. The present invention relates to an airtight structure for a vacuum evacuation device that removes air from a system to be injected to create a vacuum state.

When injecting coolant into the coolant circulation system of an automobile engine or when injecting brake fluid into a hydraulic brake system, first remove the air from the system into which the liquid is to be injected to create a vacuum inside the system. It is effective to adopt the so-called vacuum injection method, which speeds up the liquid injection work and prevents air from remaining inside by injecting the liquid while maintaining this state. Various vacuum injection devices have been developed in which a vacuum pump is combined with a vacuum pump (see, for example, JP-A-57-105516, JP-A-57-194990, etc.).

In the above-mentioned vacuum evacuation device, the nozzle of the vacuum evacuation device is inserted into the liquid injection port of a coolant circulation system, hydraulic brake device, etc., and air is removed from the nozzle. It goes without saying that the space between the inlet and the outer periphery of the nozzle must be maintained airtight, but for example, due to dimensional variations in the inlet, nozzle, or sealing member, It is quite difficult to maintain a completely airtight space between the two, and the conventional airtightness maintenance mechanism has the drawback of having to have a complicated structure.

The present invention aims to provide an airtight maintenance mechanism capable of maintaining complete airtightness with an extremely simple structure, and the present invention will be explained below with reference to the accompanying drawings.

FIG. 1 is a schematic external view of the airtight maintenance mechanism of the vacuum evacuation device (including the liquid injection mechanism) according to the present invention, where 1 is an outer casing, and 2 is an outer casing 1 as shown in FIG.
The piston is slidably fitted into a cylinder portion 11 formed inside the piston, and a flange portion 2a parallel to the bottom surface 1a of the outer casing 1 is formed at the end of the piston 2 projecting from the outer casing 1. An annular sealing material 4 is supported between the outer casing bottom surface 1a and the flange portion 2a so as to surround the outer periphery of the piston 2. The sealing material 4 is made of an elastic body such as rubber.

A nozzle 3 is fitted into the center hole 21 of the piston 2, and the nozzle 3 communicates with a vacuum valve 5 and a liquid injection valve 6 provided in the upper part of the outer casing 1. It is configured to be located below the flange portion 2a of the piston 2.

The outer casing 1 has its bottom surface 1a joined to the upper edge of the liquid inlet A, and is fixed by a clamping claw member B.
In this case, the bottom surface 1a and the flange portion 2a of the piston 2
The sealing material 4 fitted in between is not in pressure contact with the inner peripheral surface of the injection port A, and the sealing material 4 is not in pressure contact with the inner peripheral surface of the injection port A.
The outer circumferential surface of the injection port A is in a state in which it closely opposes or slightly contacts the inner circumferential surface of the injection port A, as shown by the solid line in FIG.

After the outer casing 1 is set in the injection port A section in this way, the arrow a shown in FIG.
Forcibly feed fluid such as air or oil. Then, the piston 2 moves upward against the return spring 7 due to the fluid pressure such as air or oil, and the flange portion 2a of the piston 2 crushes the sealing material 4 between it and the bottom surface 1a of the outer casing. The sealing material 4 crushed upward by the flange portion 2a is elastically deformed into a flat shape, and its outer peripheral surface bulges outward over the entire circumference, as shown by the chain line in FIG.
It is firmly pressed against the inner peripheral surface of the injection port A to create a completely airtight seal. This completely airtight seal state is reliably maintained as long as fluid pressure such as air or oil is applied within the cylinder chamber 11, and the vacuum valve 5 is opened to bleed air from the tip opening 3a of the nozzle 3. Next, the vacuum release valve 5 is closed, the liquid injection valve 6 is opened, and a predetermined liquid is injected from the nozzle 3.

When the liquid injection is completed as described above, the supply of air, oil, etc. into the cylinder chamber 11 is stopped. Then, the piston 2 is moved downward by the return spring 7, and the flange portion 2a
The compression of the sealing material 4 by the sealing material 4 is released, the sealing material 4 elastically returns to its original shape, and the airtight seal state is released.

In FIG. 2, 2b is a stopper that restricts the downward limit position of the piston 2, and 8, 9, and 10 are O-rings.

The evacuation valve 5 has a structure as shown in FIG. 3, for example.

That is, the evacuation valve 5 is constituted by a needle valve 51 having a piston portion 52 at its base, and the piston portion 52 has one surface attached to a spring 53.
The needle valve 51 is held closed by the spring force of the spring 53, and fluid pressure such as air or oil is applied to the other surface of the piston portion 52 as shown by arrow b. As a result, the valve 5 moves to the left in the figure against the spring 53, making the passage 31 connected to the nozzle 3 communicate with the passage 32 connected to a vacuum source such as a vacuum pump (not shown), and evacuation is performed as described above. I'm starting to do it.

The structure of the liquid injection valve 6 is exactly the same as the vacuum evacuation valve 5 shown in the third figure, and by opening the valve 6, a passage 31 connected to the nozzle 3 and a passage 33 (not shown) connected to a liquid supply source are opened. (see FIG. 1), and a predetermined liquid can be injected from the nozzle 3.

Vacuuming valve 5 and liquid injection valve 6 mentioned above
The structure and control mechanism are the same as those already used in conventional vacuum injection devices, and if such a vacuum valve 5 and liquid injection valve 6 are used, the control mechanism for the valves 5 and 6 can be easily controlled. It is convenient that a fluid pressure source such as air pressure or oil pressure can also be used as a fluid pressure source for operating the piston 2.
The present invention is not limited to the embodiment shown in FIG. 3, and any configuration of vacuum evacuation valve and liquid injection valve may be employed.

According to the present invention configured as described above, the inlet A
When setting the nozzle part outer casing 1 to the
The clamp may be simply rough enough to prevent the outer casing 1 from falling off from the injection port A, and after the above-mentioned setting, the fluid pressure crushes the sealing material 4 in the vertical direction to expand the diameter of the sealing material 4 and inject it. Since the structure is designed to press against the inner periphery of the mouth, even if there are slight dimensional variations in the inner diameter of the injection port or the outer diameter of the sealing material, the elastic deformation of the sealing material will sufficiently absorb the variation, creating a completely airtight seal. In addition to ensuring reliable sealing, by changing the material, hardness, outer diameter, etc. of the sealing material, or by changing the stroke size of the piston, vacuuming and liquid injection of other equipment with injection ports of different diameters is possible. It can also be applied to
The airtight seal operation and its release operation can be easily and reliably performed only by on/off control of fluid pressure such as air or oil, and together with this, it can bring about great practical effects.

[Brief explanation of the drawing]

Fig. 1 is an external front view showing an embodiment of the nozzle part of the vacuum evacuation device according to the present invention, Fig. 2 is a sectional view taken along line XX in Fig. 1, and Fig. 3 is the vacuum evacuation valve shown in Fig. 1. FIG. DESCRIPTION OF SYMBOLS 1... Outer casing, 2... Piston, 2a... Flange portion, 3... Nozzle, 3a... Tip opening, 4...
...Sealing material, 7...Return spring, 11...
...Cylinder part, A...Inlet, B...Claw member.

Claims (1)

[Scope of utility model registration request] A flange portion facing the bottom surface of the outer casing is formed below the bottom surface of the outer casing at the lower end portion of the piston fitted so as to be able to slide up and down into a cylinder portion provided in the outer casing, and a flange portion facing the bottom surface of the outer casing is formed below the bottom surface of the outer casing. a nozzle having an opening at its lower end is disposed, and a sealing material made of an annular elastic body is interposed between the bottom surface of the outer casing and the flange portion opposite thereto, with the sealing material being fitted around the outer periphery of the piston; A fluid pressure supply means is provided that forcibly feeds fluid such as air or oil into the cylinder portion to raise the piston, compress the sealing material in the vertical direction, expand its diameter, and press it against the inner circumferential surface of the injection port. Features an airtight maintenance device for the vacuum device.