JP2001304489A - Mixing valve with simplified air bleeding operation and with bleeding time shortened largely - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mixing valve capable of simplifying the air bleeding operation and shortening the time of operation to a great extent. SOLUTION: The mixing valve is composed of a distribution part to make oil measurement connected with an oil main pipe, an oil-air mixing chamber connected with an air main pipe, and a check valve connected on the oil influx side to the oil discharge side of the distribution part and to the oil-air mixing chamber on the oil outflow side, wherein an opening means is installed to keep the condition so that the oil is discharged continuously during the air bleeding operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixing valve, and more particularly to a mixing valve which can simplify the air bleeding of the mixing valve and greatly reduce the air bleeding time.

[0002]

2. Description of the Related Art A mixing valve is usually used to supply oil air to a lubricating portion of a main shaft of a machine tool or the like. The supply of oil is very small and the supply is
Too much or too little creates problems with heat generation or seizure of the bearings on the spindle. Spindle lubrication of a machine tool is an important matter as compared with general lubrication on other sliding surfaces, and if the spindle is seized, a large amount of repair and replacement costs are required.

As disclosed in Japanese Utility Model Registration No. 30039 or Utility Model Registration No. 2589436 in 1990, the mixing valve has, as a basic structure, an oil main pipe and an air main pipe penetrated into a block, It consists of a distributor, a check valve, and an oil / air mixing chamber provided in the block. Oil flows into the distributor from the oil main pipe and is metered, and a fixed amount of oil passes through a check valve and is sent to the oil-air mixing chamber. On the other hand, the flow rate of air is adjusted from the main air pipe by a needle valve, and is mixed with oil in an oil / air mixing chamber. The oil and air mixed in the oil-air mixing chamber are supplied to the lubrication point as oil-air.

[0004] In oil-air lubrication using a mixing valve, it is necessary to meter and discharge a small amount and a fixed amount of oil, so that air bleeding is indispensable. In order to properly perform oil-air lubrication by the mixing valve, bubbles existing in the oil path in the mixing valve must be
Must be removed during initial test run. This air bleeding work
This is done by driving the pump after completing the lubrication system piping. Usually, the metering means of the mixing valve is a metering piston type, which is basically operated intermittently by a pump to supply oil to the distributor. In this intermittent operation, when the pump is driven, the metering piston operates to complete the discharge of oil, and when the pump is stopped, the stock oil for the next discharge is performed. Therefore, at the time of the air bleeding operation, it is fundamental to operate the pump intermittently to repeatedly operate the distributor.

[0005]

In order to discharge air bubbles in the oil path to the outside of the mixing valve, it is necessary to move a very small amount of oil in the oil path by intermittent operation. Since the oil path of the mixing valve is intruded, air bubbles remaining in the screw portion or the narrow portion during the air bleeding operation may simply reciprocate in the same location. For this reason, in order to fill only the oil in the oil path, it is necessary to change the position of the mixing valve many times in a direction in which air bubbles easily escape. After several air bleeding operations, air bubbles that cannot be removed remain in the oil path.To ensure the reliability of the air bleeding operation, it is necessary not only to carefully perform the air bleeding operation but also to use the air. I had to repeat the punching work.

[0006] The main body of the mixing valve is usually
Since a metal such as aluminum is used, the state of air bleeding (the presence or absence of residual air bubbles) cannot be visually confirmed from the outside. For this reason, there is no way to confirm the completion of air bleeding in a state in which minute bubbles are scattered in the oil path, and this is one of the factors that increase the working time of the entire air bleeding operation.

SUMMARY OF THE INVENTION An object of the present invention is to provide a mixing valve which simplifies the air bleeding operation and greatly reduces the operation time.

[0008] This object is achieved by the mixing valve according to the present invention by keeping the distributor open during the air bleeding operation to create a continuous oil flow and exhausting air bubbles existing in the oil path at a stretch. Is done.

[0009]

According to the present invention, there is provided a distribution section connected to an oil main pipe for measuring oil, an oil / air mixing chamber connected to an air main pipe, and an oil discharge of the distribution section on an oil inflow side. And a check valve connected to the oil-air mixing chamber on the oil outflow side, and an opening means capable of holding a state in which oil is continuously discharged during the air bleeding operation is provided in the mixing valve. Features.

It is preferable that the distributor has a valve which is opened and closed by an intermittent oil supply operation by a pump, and the opening means can hold the valve in an open state. Preferably, the opening means comprises an opening pin. Preferably, the release pin is connected to an air release button provided on an outer surface of the mixing valve. The release pin preferably extends through the distributor toward the valve. Preferably, the distributor includes a measuring nipple for adjusting an oil supply amount, and the release pin is fixed to an air release button provided on the measuring nipple.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a mixing valve according to the present invention will be described below with reference to the accompanying drawings.

(Basic Structure) As shown in FIGS. 1 and 2,
The mixing valve has a substantially hexahedral block-shaped body 100 as a main body, and an oil main pipe 110 therein.
And the main air pipe 120 is formed substantially in parallel.
The mixing valve includes therein a distributor 130 for quantifying an oil supply amount, an oil-air mixing chamber 140 for mixing oil and air, and a distributor 130 and an oil-air mixing chamber. Check valve 150 interposed
And The distributor is connected to the oil main pipe,
The air mixing chamber is connected to the main air pipe.

The distributor 130 is housed in a distributor housing hole formed in the body 100, and a measuring nipple 200 is screwed to the body at a side opening (upper end in the figure) of the body.

The distributor 130 includes an umbrella valve 131, a tubular control valve 132, and a metering piston 133. The tubular control valve 132 is formed with a hole 132b whose hollow portion 132a opens into the compression spring chamber 137 of the distributor housing hole. The umbrella valve 131 is provided on the oil inflow side (lower side in the figure) connected to the oil main pipe 110 of the distributor. The umbrella type valve is constantly pressed toward the tubular control valve by a compression spring 134 provided between the umbrella type valve and the distributor accommodating hole. Therefore, when introducing oil into the distributor, the umbrella-type valve closes the umbrella-type valve-side opening 132c of the hollow portion 132a of the tubular control valve 132.

The metering piston 133 is slidably provided on the outer periphery of the tubular control valve 132. The metering piston has a sleeve 135 on the oil inflow side. In the compression spring chamber 137, a compression spring 136 is provided between the metering piston 133 and the inner shoulder of the measuring nipple 200. The compression spring 136 allows the fixed amount piston 13
3. Sleeve 135 and tubular control valve 132
To the umbrella type valve 131 side.

In the mixing valve having such a structure, the pump connected to the oil main pipe 110 is intermittently driven so that the oil is pressure-fed to the distributor 130 through the oil main pipe. When the pump is driven to increase the oil pressure in the main oil pipe, the oil presses the umbrella valve 131 against the tubular control valve 132 to close the umbrella valve side opening 132c of the tubular control valve. When the oil pressure in the oil main pipe further increases, the oil bends the outer periphery of the lip of the umbrella-type valve 131 inward, passes through the umbrella-type valve, hits the sleeve 135 and the metering piston 133, and the metering piston hits the measuring nipple 200. The oil is introduced between the umbrella type valve 131 and the sleeve 135 by moving the compression spring 136 up to the compression spring 136. On the other hand, when the sleeve 135 and the metering piston 133 move against the compression spring 136, the oil that has been stored in the distributor housing hole outside the metering piston 133 up to now is removed from the check valve 15.
0 and is pushed out into the oil / air mixing chamber 140 by one stroke. The main air pipe 12 is provided in the oil / air mixing chamber.
Since the compressed air from 0 is constantly fed while being controlled by the supply amount by the needle valve 400, the oil is mixed with the oil and air in this chamber and sent to the oil lubrication unit.

When the operation of the pump is stopped and the oil pressure in the main oil pipe 110 decreases, the sleeve 135 and the metering piston 133 are pressed toward the umbrella valve 131 by the action of the compression spring 136. In the distributor receiving hole, the oil stored in the space defined by the outer periphery of the tubular control valve 132, the surface of the umbrella type valve facing the tubular control valve, and the surface of the sleeve 135 facing the umbrella type valve is umbrella-shaped. Valve 131 is a tubular control valve 1
32. Therefore, the umbrella-shaped valve-side opening 132c of the tubular control valve is opened, and the oil passes through the gap between the umbrella-shaped valve-side opening and the opening pin 300 (a characteristic component according to the present invention, which will be described in detail later). ,
The compression spring chamber 13 enters the hollow portion 132a of the tubular control valve and passes through the hole 132b of the tubular control valve.
7 to prepare for the refueling operation when the next pump is driven.

Thus, at the time of oil lubrication, the distributor 1
At 30, after the oil is discharged in a one-shot pressurized state by the pump, the oil path becomes a closed circuit due to the action of the umbrella type valve when the pump is stopped, and only the trace amount of oil measured by the fixed amount piston 133 is discharged.

The amount of oil supplied by the distributor is adjusted by screwing the measuring nipple 200 having a different length under the neck into the body 100. The basic structure of such a distributor for performing oil metering, except for the opening pin 300, is described in the above-mentioned Japanese Utility Model Registration No. 30039, 1990.

(Characteristic Structure) In the mixing valve according to the present invention, an opening pin 300 is provided in the hollow portion 132a of the tubular control valve 132 of the distributor. One end (lower end in the figure) of the release pin extends toward the umbrella type valve 131, and the other end (upper end in the figure) is fixed to an air release button 301 provided on the measuring nipple 200. The air bleeding button 301 is connected to the concave portion 20 formed in the measuring nipple 200.
1. The release pin pushes the air release button 301 into the body when the pump is stopped,
The tip has a length such that the umbrella valve can be separated from the tubular control valve 132 by contacting the umbrella valve 131. The release pin 203 is slidably provided in the hollow portion 132a of the tubular control valve with respect to the measuring nipple.
Unless the air release button is pushed into the body, the release pin is separated from the umbrella type valve 131 by the action of the compression spring 302 provided between the fixed amount nipple 200 and the air release button 301 in the concave portion 201. Does not interfere with the sealing function of the valve.

Reference numeral 303 denotes an air release button 30.
This is a stopper for maintaining the state in which 1 is pushed into the concave portion 201 of the measuring nipple 200.

(Air bleeding operation method) Next, a case where air bleeding is performed by the mixing valve according to the present invention will be described.

When the air bleeding button 301 provided on the fixed amount nipple 200 is pushed into the body 100 while the oil is intermittently pumped into the main pipe by the pump, the release pin 300 fixed to the air bleeding button is moved to the distributor. The umbrella type valve 131 is pressed against the compression spring 134 on the oil inflow side and separated from the tubular control valve 132 to make the seal of the opening 132c of the tubular control valve 132 by the umbrella type valve free. As a result, the oil intermittently pumped from the pump is supplied to the outer periphery of the bent lip of the umbrella valve 131, the umbrella valve side opening 132c of the tubular control valve.
The air can be continuously discharged through the gap between the opening pin 300 and the hollow portion 132a of the tubular control valve, so that the air bubbles in the mixing valve can be discharged to the outside together with the oil.

In the case of a multi-port mixing valve, the air release button 301 may be operated for each port, but it is also possible to provide a means for operating all ports simultaneously. In this case, in the case of a multi-port mixing valve,
The time required for the bleeding operation is further speeded up and further reduced.

According to the mixing valve of the present invention, highly reliable air bleeding can be performed reliably and in a short time without visual confirmation of the completion of air bleeding. Also, a cleaning effect of discharging small dust in the mixing valve together can be expected.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing one embodiment of a mixing valve according to the present invention, in which an opening means is in an open state.

FIG. 2 is a schematic sectional view showing one embodiment of a mixing valve according to the present invention, in which an opening means is in an intermittent operation state.

[Brief description of reference numerals]

 REFERENCE SIGNS LIST 100 body 110 oil main pipe 120 air main pipe 130 distributor 140 oil / air mixing chamber 150 check valve 200 measuring nipple 300 release pin 301 release button 302 compression spring 303 stopper 400 needle valve

 ──────────────────────────────────────────────────続 き Continued on front page F term (reference) 3E083 AA20 AE12 AG40 4F033 QB02Y QB03X QB11X QB12Y QD03 QD14 QF11X QF21X QK16X QK16Y QK23X QK23Y QK26X

Claims (6)

[Claims] An oil-air mixing chamber connected to an air main pipe, an oil-air mixing chamber connected to the air main pipe, and an oil in the distribution section on the oil inflow side. A mixing valve comprising a check valve (150) connected to the discharge side and connected to the oil-air mixing chamber on the oil outflow side, an opening means for maintaining a state in which oil is continuously discharged during the air bleeding operation ( 300) is provided. 2. The dispenser according to claim 1, further comprising a valve (131) which is opened and closed by an intermittent oil supply operation by a pump, and wherein said opening means can keep said valve open.
The mixing valve according to claim 1. 3. The mixing valve according to claim 1, wherein said opening means comprises an opening pin. 4. The mixing valve according to claim 3, wherein the release pin is connected to an air release button (301) provided on an outer surface of the mixing valve. 5. The mixing valve according to claim 4, wherein said opening pin extends inside said distributor toward said valve. 6. The distributor has a metering nipple (200) for adjusting an oil supply amount, and the release pin is provided with:
The mixing valve according to any one of claims 3 to 5, wherein the mixing valve is fixed to an air release button (301) provided on the measuring nipple.