JP2589436Y2 - Mixing valve - Google Patents

Description

[Detailed description of the invention]

[0001]

[Industrial application] This invention is applied to mixing valves,
More particularly, the present invention relates to a mixing valve used to supply spray oil to a component to be lubricated.

[0002]

2. Description of the Related Art In a mixing valve, an oil and air circuit is divided by a check valve, and the check valve opens and closes according to oil pressure when an oil pump is operated (see Japanese Utility Model Publication No. 2-30039). If dust, swarf or the like adheres to the seal surface of the check valve, poor sealing occurs. For this reason, it has been known that air flows backward into the spray oil distributor, making it impossible to accurately measure and discharge oil (poor lubrication).

[0003] The following three are considered as causes of the generation of such dusts and chips.

1) Residual chips generated during processing of mixing valve parts

2) Screw chips generated during assembling of the mixing valve

[0006] 3) Dust and chips generated during construction of oil piping

Regarding 1) of these three causes, chips can be considerably removed by a deburring device or washing. In the case of 3), flushing after installation of the piping and installation of a line filter can be dealt with. However, 2) is based on the structure of the mixing valve itself, and it is difficult to avoid the conventional mixing valve because the check valve is directly screwed into the mixing valve body.

[0008]

SUMMARY OF THE INVENTION The object of the present invention is to cause a screw chip generated at the time of assembling a mixing valve.
An object of the present invention is to provide a mixing valve capable of avoiding poor lubrication.

[0009]

In order to achieve this object, the present invention provides an oil measuring section connected to an oil guide hole,
A check valve whose inflow side is connected to the discharge side of the oil measuring section, an oil / air mixing chamber communicating with the air guide hole,
In a mixing valve including a body for housing these components, the check valve is housed in the body while being housed in the casing.

[0010] The casing is preferably formed of a material harder than the body.

It is preferable to provide a mechanism for fixing the casing to the body, and this fixing mechanism can be constituted by a plate and a bolt.

[0012]

When the mixing valve is assembled, the check valve is once housed in the casing and then housed in the body. Therefore, before the check valve is housed in the casing before being incorporated into the body, the check valve can be washed as a single item and then incorporated into the body.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, the mixing valve is
It has a substantially tetrahedral block-shaped body 100 in which an oil guide hole 110 and an air guide hole 120 are formed substantially parallel.

First, the oil measuring section will be described. Substantially perpendicular to the oil introduction hole 110, the metering valve accommodation hole 1
30 is formed to communicate therewith. A measuring nipple 131 is screwed into a side opening (upper end in the figure) of the block-shaped body 100 of the measuring valve accommodating hole 130 so that the screw can be adjusted. An umbrella-shaped valve 133 is provided on a pipe 111 side communicating with the oil guide hole 110 via a compression spring 132.
The tubular control valve 114 is placed above the umbrella valve 133 in the illustrated embodiment. On the outer periphery of the tubular control valve 114, a piston 116 having a sleeve 115 mounted on the pipe 111 side is slidably placed. A compression spring 117 is provided between the piston 116 and the inner shoulder of the metering nipple 131. A small hole 119 communicating with a chamber 118 for accommodating a compression spring 117 is provided in a part of the tubular control valve 114. The structure of such an oil measuring section is described in Japanese Utility Model Publication No. 2-30039.

Next, the oil / air mixing chamber 140 will be described.
It is substantially perpendicular to 20 and is formed to communicate therewith. The oil / air mixing chamber 140 is substantially parallel to the metering valve housing hole 130, and the discharge side thereof is connected to a pipe to which the spray oil is to be supplied. Air guide hole 12
A needle valve 150 for adjusting the air supply amount is provided in a reduced diameter portion which is a connection portion between the oil mixing chamber 140 and the oil / air mixing chamber 140. The needle valve 150 is connected to a screw 151 formed on the opposite side of the block-shaped body with respect to the oil-air mixing chamber 140, and the amount of compressed air to be supplied to the oil-air mixing chamber 140 is adjusted by the screw operation. I do.

Further, the check valve 162 will be described. A check valve housing casing housing hole 160 is formed between the metering valve housing hole 130 and the oil / air mixing chamber 140 in a parallel relationship with these. The casing housing hole 160 is formed by drilling inward from one end (the lower end in the figure) of the body 100. One end (upper side in the figure) of the casing housing hole 160 is communicated with the compression spring chamber 118 of the metering valve housing hole 130 by a pipe 170. The casing housing hole 160 is connected to the neck portion of the reduced diameter portion of the oil / air mixing chamber 140 on the side wall by a conduit 180.

The casing 161 accommodated in the casing accommodating hole 160 has a check valve 1 in its axial direction.
A storage hole 163 for screwing and storing the 62 is formed through. The storage hole 163 is located at
0, and communicates with the pipe 180 via a horizontal hole 164 formed in the side wall of the casing 161 at the bottom in the figure.

The check valve 162 is connected to the casing 16
1 is screwed and housed in the housing hole 163 formed so that the inflow side is located on the pipeline 170 side. The outflow side of the check valve 162 is connected to the side hole 164 of the casing and the line 18.
0 and is connected to the oil-air mixing chamber 140.
Reference numeral 165 denotes a check plug, which is a casing accommodation hole 1.
63 is used to close the upper and lower ends of the drawing.

At the outer periphery of the casing 161, two concave portions are formed over the entire periphery. By inserting O-rings into these concave portions, a seal between the outer peripheral wall of the casing 161 and the inner peripheral wall of the casing receiving hole 160 is formed. Do. The casing 161 is fixed in the casing receiving hole 160 by a plate 190 provided at one end (the lower end in the illustrated embodiment) of the body 100. This plate has a hole 20 formed in the body 100 on the side of the oil measuring section 130.
It is fixed to the body by a bolt 201 screwed to zero. Reference numeral 210 denotes a check port plug, which is screwed into the check port 201. This check port plug 21
0 is sealed by an O-ring 212,
The ring is located at the tip of the thread of the check port plug. By doing so, since the O-ring seals before the check port is screwed, it is possible to prevent chips generated when the check port is screwed from entering the oil.

The casing 161 is made of a material harder than the body 100, so that the generation of chips can be suppressed. The body 100 may be made of the same hard material as the casing 161, but in consideration of the yield in processing the body 100, it is necessary to select a member having good machinability. The body 100 is preferably made of an aluminum material in terms of corrosion resistance, rust prevention, machinability, light weight, and the like. On the other hand, for the casing 161, it is preferable to use brass since the check valve 162 is screwed in and mounted, so that the amount of screw chips is slightly smaller than that of aluminum.

The measuring nipple 131, like the check port plug 210, has the O-ring 134 disposed near the tip of the threaded portion, so that chips generated when the measuring nipple 131 is screwed in enter the oil. Has been prevented.

Next, the flow of the lubricating oil when the mixing valve is used will be described.

The oil is pumped through the oil guide hole 110 by intermittently operating a pump (not shown). During operation of the pump, the oil passes from the oil guide hole 110 through the pipe line 111 to press the umbrella valve 133 against the tubular control valve 114 and close its lower opening 114a. The pressurized oil further passes through the outer peripheral portion of the umbrella valve 133 by bending it inward, and the sleeve 115 and the piston 116
Is pushed up until it hits the measuring nipple 131. As the sleeve 115 and the piston 116 are pushed up against the compression spring 117, the oil that has been stored in the compression spring chamber 118 until then passes through the pipe 170, the check valve 162, the side hole 164, and the pipe 180. Through the oil / air mixing chamber 140. Since the compressed air from the air guide hole 120 is constantly sent into the oil / air mixing chamber 140, the oil is sprayed in this chamber and sent to the oil lubrication unit.

[0025]

As described above in detail, according to the mixing valve of the present invention, after the check valve is screwed into the casing, the check valve can be washed separately while the check valve is housed in the casing. Can be removed. In addition, even if dust and chips adhere to the seal surface of the check valve and a defective seal occurs, and even if air flows back into the distributor, the entire casing can be replaced, thus avoiding the generation of new chips. Can be.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a mixing valve according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 body 110 oil guide hole 120 air guide hole 130 oil measuring section (metering valve housing hole) 140 oil / air mixing chamber 161 casing 162 check valve

Claims (4)

(57) [Scope of request for utility model registration] 1. A oil metering unit to be connected to the oil guide hole (110) and (130), Oil Air mixing chamber communicating with the e Ashirubeana (120) and (140), the discharge side of the oil metering unit
Connected on the inflow side, connected to the oil-air mixing chamber on the outflow side
In a mixing valve including a check valve (162) to be operated and a body (100) for housing the check valve (162) , the check valve housing casing housing hole (160) is
Check valve (162) formed on day (100)
Is housed in the check valve housing casing (161).
The check valve storage casing is
The mixing valve is housed in the check valve housing casing housing hole while housing the housing . 2. The mixing valve according to claim 1, wherein the casing (161) is formed of a material harder than the body (100). 3. The mixing valve according to claim 1, further comprising a fixing mechanism for fixing the casing (161) to the body (100). 4. The mixing valve according to claim 2, wherein said fixing mechanism comprises a plate (190) and a bolt (201).