JPS6216199Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plug valve for a thermal spray machine, and more particularly to an improvement in a cylindrical plug valve for controlling gas flow flowing through a thermal spray machine.

In other words, the present invention is based on the previously known Japanese Patent Publication No.
This was developed for the purpose of improving the invention disclosed in Publication No. 13502, and the historical background of the plug valve in the thermal spraying machine of the present invention is disclosed in detail in the above invention, so a detailed explanation thereof will be omitted. However, why the present invention attempts to improve the above invention will be explained below, focusing on the problems of the invention.

In the above invention, the first and biggest problem is that, in addition to the primary gas flow orifice, the valve core itself has at least one (actually 2 to 3 are required) relatively small secondary gas flow restrictor orifice. Because the secondary gas flow restrictor orifice is drilled through the relatively large diameter valve core, it is extremely difficult and requires high-precision machining technology.
The diameter of the orifice on the next side is extremely small, for example 0.5 to 0.8 mm, and in practice several holes must be drilled, and moreover, it is difficult to drill through the primary orifice at an angle of inclination required for control. This is considered to be the biggest difficulty in processing this type of plug valve, and it has not been solved to date.

This is because, as mentioned above, the valve core itself has a structure in which throttle orifices are provided on the inflow side and the outflow side, respectively.

Next, in the above invention, since the throttle orifice is formed in the valve core itself as described above, there is a problem in that the clogging phenomenon that occurs when dust, oil, etc. adheres to the throttle orifice cannot be easily removed. It was hot.

That is, when a clogging phenomenon occurs in the throttle orifice, the clogging cannot be removed unless the valve mechanism is disassembled and the valve core is taken out to the outside, resulting in a serious drawback in terms of repair.

In particular, if the secondary gas flow restrictor orifice becomes clogged as described above, the flow rate control will be poor, and the control gas flow for ignition will not be accurately transmitted to the outlet end and may be blocked. This poses a risk of ignition failure or backfire.

In any case, in the above invention, since the primary gas flow orifice and the secondary gas flow restriction orifice are formed in the valve core itself, the above-mentioned serious drawbacks occur during manufacturing, repair, and operation. This problem has remained unresolved until now.

By solving these problems, the present invention is an innovative plug for thermal spraying machines that has never existed before, which is extremely simple to manufacture, easy to repair, and solves all ignition problems such as ignition failure. The purpose is to provide a valve.

That is, the present invention provides a plug valve for controlling a gas flow flowing through a thermal spray machine, in which a valve body 3 is provided separately and detachably from a main body 2 of a thermal spray machine 1, and a cylindrical cylinder is attached to the valve body 3. An inlet end 16 is provided on one side of the cylindrical hole 14 and extends to the thermal spraying machine main body 2 side to pass through the valve body 3 perpendicularly to the cylindrical hole 14 . A gas flow passage 15 having an outlet end 17 is bored on the other side, and a valve body 18 is rotatably fitted into the cylindrical hole 14, and the valve body 18 has a gas flow passage 15 having an outlet end 17. A main stream hole 26 and a branch hole 27 communicating with the main stream hole 26 are respectively formed in the valve body 3, and the branch hole 27 communicates with the inlet end 16 of the gas flow passage 15 by rotation of the valve body 18. At this time, at least one relatively small orifice 28 that communicates with the outlet end 30 of the main hole 26 is bored, and furthermore, the orifice 28 and the outlet side of the gas flow passage 15 are provided on the thermal spraying machine main body 2 side. A compensating groove 29 is drilled to communicate the flow, and an airtight seal is interposed between the valve body 3 including the orifice 28 and the thermal spraying machine body 2, and the valve body 18 rotates to branch. At the same time as the hole 27 communicates with the inlet end 16 of the gas flow passage 15, the outlet end 30 of the main hole 26 communicates with the outlet side of the gas flow passage 15 via the orifice 28 and the compensating groove 29. When the valve body 18 rotates while maintaining the communication state, the branch hole 2 of the main hole 26
7 is arranged so that the inlet end 31 of the main hole 26 and the inlet end 16 of the gas flow passage 15 are placed in communication with each other before the communication state with the inlet end 16 of the gas flow passage 15 is released. It is in.

In other words, the present invention, to summarize, firstly includes the valve body 3.
The valve body 3 is formed separately from the thermal spraying machine main body 2, and the valve body 3 is detachably attached to the thermal spraying machine main body 2.Secondly, a cylindrical hole 14 is formed in the valve body 3.Thirdly, A gas flow passage 15 having an inlet end 16 and an outlet end 17 is provided perpendicularly to the cylindrical hole 14, and fourthly, a rotatable valve body 18 is fitted into the cylindrical hole 14. fifthly, the main hole 26 having a branch hole 27 is formed in the valve body 18; and sixthly, the main hole 26
At least one orifice 28 that can communicate with the outlet end 30 of the main body 3 of the thermal spraying machine is formed. Eighthly, an airtight seal is interposed between the valve body 3 including the orifice 28 and the thermal spraying machine body 2.

As described above, the gist of the present invention is the first to eighth configurations.

As a result of this configuration, (a) First, the valve body does not have a secondary gas throttle orifice like the conventional one, that is, it has only a main hole and a branch hole as the conventional primary gas flow orifice, so the valve body is difficult to operate. Processing of the valve body has become extremely simple, all problems associated with processing conventional valve bodies have been solved, and manufacturing of the valve body has become extremely easy.

(b) Next, the orifice, which is difficult to machine, is drilled into the valve body, making it easy to machine the orifice.

(c) Also, since the pressure flow of the branch hole and main hole blows away dirt, etc., there is almost no clogging, but even if the orifice becomes clogged, the valve body is separate from the main body of the thermal spraying machine and can be detached. Since the valve body is formed in a thermal spraying machine body, the valve body can be removed from the thermal spraying machine body to remove clogging and repair the valve body, which has the advantage that these operations can be performed accurately and easily.

(d) Furthermore, as mentioned above, since no orifice is formed in the valve body, there is no ignition failure or fluctuation in ignition operation due to orifice failure, which has the practical effect of enabling accurate and reliable ignition. .

As mentioned above, the effects obtained by this invention are as follows:
We believe that this invention is particularly remarkable compared to the publicly known inventions mentioned above, and is more than worthy of registration as a utility model.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below according to an embodiment shown in the drawings.

FIG. 1 shows a side view of the thermal spraying machine 1, in which a valve body 3 is formed separately from the thermal spraying machine main body 2, and one end surface of the valve body 3 is formed on one end surface of the thermal spraying machine main body 2 as shown in FIG. A threaded rod 6 is inserted into the threaded hole 4 of the thermal spraying machine main body 2 from the through hole 5 which faces each other and is bored on both sides of the valve main body 3.
The valve body 3 is separably integrally connected to the thermal spraying machine body 2 by screwing the valve body 3 into the thermal spraying machine body 2.

7 and 8 are seal bodies interposed between the opposing surfaces of the valve body 3 and the thermal spraying machine body 2 and the opposing surfaces of the valve body 3 and the gas hose connection body 11; 9 is a fuel gas conduit such as an acetylene pipe; Reference numeral 10 denotes an oxidizing gas conduit such as an oxygen conduit, which is connected together with the fuel gas conduit 9 to a gas hose connector 11 whose one end is screwed to the valve body 3.

Reference numeral 12 denotes an air conduit connected to a connecting pipe 13 .

14 is a cylindrical hole bored in the valve body 3 to pass through the valve body 3; 15 is a cylindrical hole bored through the valve body 3 perpendicularly to the cylindrical hole 14 and extending toward the spray gun body 2 side; The provided gas flow passage 15' is also a gas flow passage extending through the valve body 3, said gas flow passage 15 is for fuel gas, and said gas flow passage 15' is for oxygen or other oxidizing gas. It is for gas.

16 is an inlet end of a gas flow passage 15 formed on one side of the cylindrical hole 14, and 17 is an outlet end of the gas flow passage formed on the other side.

Reference numeral 18 denotes a valve body rotatably fitted in the cylindrical hole 14, and a circular knob 19 is provided on one end side of the valve body 18 and positioned in contact with the bearing surface of the valve body 3.
The other end is provided with a handle 20 that is screwed together with a screw.

Reference numeral 21 denotes a plunger which is internally mounted on the inlet side of the gas flow passage 15 by a spring 22 so that its tip is always pressed against the valve body 18 side.
3, an O-ring 24 is interposed between the inner walls of the gas flow passage 15 on the outer peripheral surface thereof, and an O-ring 25 is also disposed at the tip thereof.

Next, the valve body 18 has a main hole 2 as shown in FIG.
6 is bored through the main hole 26, and one branch hole 27 is formed at a predetermined angle to the main hole 26 in communication with the main hole 26.

28, 28', and 28'' are 3 holes that penetrate through the valve body 3 and are bored in the same direction as the gas flow passage 15 so that one end side thereof communicates with the cylindrical hole 14 of the valve body 3, respectively.
relatively small flow control orifices, 29
are the orifices 28, 28', 2 as shown in FIG.
A compensating groove is shown on the side of the thermal spraying machine body 2 facing the outlet side of the gas flow path 15 in communication with the outlet side of the gas flow passage 15.

Moreover, when the valve body 18 rotates clockwise in FIG.
The orifice 28 is arranged such that when it coincides with and communicates with the inlet end 16 of the first orifice 26, the outlet end 30 of the main hole 26 is simultaneously in communication with the first orifice 28.

When the valve body 18 further rotates in the same direction, the branch hole 2
7 is maintained in communication with the inlet end 16 of the gas flow passage 15, and the outlet end 30 of the main stream hole 26 is
Each orifice 28', 28'' is arranged at a predetermined interval from the orifice 28 so as to be in communication with the next second orifice 28' and third orifice 28'', respectively.

Furthermore, before the valve body 18 rotates and communication between the branch hole 27 and the inlet end 16 of the gas flow passage 15 is cut off, the inlet end 31 of the main flow hole 26 is already in communication with the gas flow passage 15. The outlet end 17 of the orifice or gas flow passage 15 and the main hole 26
The outlet end 30 of the branch hole 2 is in communication with the branch hole 2.
7 is arranged and formed with respect to the main flow hole 26.

Therefore, after the branch hole 27 starts communicating with the inlet end 16 of the gas flow passage 15, the inlet end 31 of the main flow hole 26 is connected to the inlet end 16 of the gas flow passage 15 and the outlet end 30 of the main flow hole 26. is in complete direct communication with the outlet end 17 of the gas flow passage 15, that is, the gas flow passage 1
5, the inlet end 16 of the gas flow passage 15 and the outlet end of the gas flow passage 15 are always connected via the orifices 28, 28', 28'' and the compensating groove 29 until the main flow hole 26 is located parallel to the gas flow passage 15. The orifice, the main flow hole, and the branch hole are arranged so that the sides communicate with each other so that the gas flow is not blocked.

In the embodiment constructed as described above, in operation the fuel line 9 is connected to the gas hose connection 11 and is supplied with fuel gas under pressure.

Next, when igniting, change the handle 2 from the state shown in Figure 2.
0 in the clockwise direction, the branch hole 27 comes into communication with the inlet end 16 of the gas flow passage 15 as shown in FIG. A gas flow for communication and ignition flows from the branch hole 27 through the main hole 26, the orifice 28, and the compensating groove 29 to the outlet side of the gas flow passage 15 on the side of the thermal spraying machine main body 2. ignited, for example by a spark igniter.

When the handle 20 is further rotated in the same direction from this ignition state, the outlet end 30 of the main hole 26 communicates with the first and second orifices 28, 28' as shown in FIG. Orifice 28,2
8' causes more flow than in the state shown in Figure A, increasing ignition.

From this state, move the handle 2 as shown in Figure C.
0 in the same direction, a part of the outlet end 30 of the main hole 26 is connected to the inlet end of the gas flow passage 15 before the branch hole 27 ends communicating with the inlet end 16 of the gas flow passage 15. 16, and gas flows from part of the branch hole 27 and part of the inlet end 31 of the main hole 26 to the orifice and the outlet end 17 of the gas flow passage 15 via the outlet end 30, respectively. flows.
From this state, move the handle 20 further as shown in the figure D.
When rotated to an allowable angle, the communication between the branch hole 27 and the inlet end 16 of the gas flow passage 15 is terminated, and the inlet end 31 of the main hole 26 is completely communicated with the inlet end 16 of the gas flow passage 15. When the main flow hole 26 becomes in direct communication with the gas flow passage 15, the entire gas flow for the operation flows to the thermal spraying machine main body 2 side.

Moreover, the respective gas flow positions simultaneously cause oxygen to flow from the oxygen conduit 12 into the gas hose connection pipe 13 and into the thermal spray machine body 2.

As described above, the rotation of the valve body 18 causes the main hole 2 to open.
The branch hole 27 of 6 is connected to the inlet end 16 of the gas flow passage 15.
The state in which the main flow hole 26 starts communicating with the gas flow passage 15 and the restricted gas flow starts to flow to the outlet side of the gas flow passage 15 (the state shown in FIG. The inlet end 1 of the gas flow passage 15 is always maintained until the valve body 18 reaches the state shown in FIG.
6 and the outlet side are in communication with each other to prevent the gas flow from being cut off and thus from extinguishing the flame.

Moreover, a seal body 7 is provided on the connecting surface between the valve body 3 including the orifices 28, 28', and 28'' and the thermal spraying machine body 2.
Since it is made by interposing the valve, there is no possibility that the gas flow will leak into the valve body side.

In the above embodiment, three orifices are provided to easily adjust the gas flow rate, but the number may be one, and the branch hole for the main hole is not provided in the embodiment. Although the diameters are the same, the diameter of the branch hole is not necessarily the same, and the diameter of the branch hole may be smaller than that of the main hole. Furthermore, the angle of the branch hole with respect to the main stream hole is such that the inlet end of the main stream hole can communicate with the inlet end of the gas flow path before the communication between the branch hole and the inlet end of the gas flow path is cut off as described above. Any angle within the range is sufficient.

Further, the means for connecting the valve body 3 and the thermal spraying machine body 2 is by no means limited to the tightening means using a threaded rod as in the above embodiment. Further, the means for airtight sealing between the valve body and the thermal spraying machine body is by no means limited to the seal body, but may be any suitable sealing material.

Next, in FIG. 7, the valve body 32 for fuel gas, the valve body 33 for oxidizing gas, and the valve body 34 for air are each formed into three separate bodies, and one end side of each valve body 32, 33, 34 is formed. are provided with gears 35, 36, 37, and the gear 3
5, 36, and 37 are arranged in three valve bodies 3 to be engaged with each other.
2, 33, and 34 are installed in parallel. , 34 rotate simultaneously, and the fuel gas, oxidizing gas, and air can be separately supplied to the main body of the thermal spraying machine.

The shape, ignition system, etc. of the thermal spraying machine are by no means limited to the embodiments, and the present invention can be widely used as a gas control valve in a thermal spraying machine.

[Brief explanation of the drawing]

FIG. 1 is a side view of a thermal spraying machine as an example. FIG. 2 is a cross-sectional view of the main part of the valve main body portion taken from the vertical direction in FIG. 1. Figure 3 is a bottom view of the compensating groove in the main body of the thermal spraying machine. Fourth
Figure A is a plan view of the main part of the valve body, and Figure B is a plan view of the main part of the valve body. FIG. 5 is a cross-sectional view of the plug valve in the transverse direction. 6th
The figure is an operation explanatory diagram showing the rotating state of the valve body. FIG. 7 shows a valve body as another embodiment, in which A is a plan view and B is a sectional view. 1...Spray gun, 2...Thermal spraying machine body, 3...
... Valve body, 14 ... Cylindrical hole, 15 ... Gas flow passage, 16 ... Inlet end, 17 ... Outlet end, 18
... Valve body, 26 ... Main hole, 27 ... Branch hole, 2
8, 28', 28''... Orifice, 29... Compensation groove, 30... Valve body outlet end, 31... Valve body inlet end.

Claims (1)

[Claims for Utility Model Registration] 1. A plug valve for controlling gas flow flowing through a thermal spraying machine, which includes a valve body 3 that is separate and detachable from the main body 2 of the thermal spraying machine 1; A cylindrical hole 14 is drilled through the valve body 3, and a cylindrical hole 14 is perpendicular to the cylindrical hole 14, extends through the valve body 3 to the thermal spraying machine body 2 side, and extends to one side of the cylindrical hole 14. Inlet end 16 on the other side and outlet end 17
a gas flow passage 15 having a gas flow path 15; a valve body 18 rotatably fitted in the cylindrical hole 14;
Mainstream hole 26 bored through the mainstream hole 2
6, and when the branch hole 27 communicates with the inlet end 16 of the gas flow passage 15 by rotation of the valve body 18, the outlet end 30 of the main flow hole 26 At least 1 connected
Two relatively small orifices 28 are bored in the valve body 3, and a compensating groove 29 communicating with the orifice 28 and the gas flow passage 15 on the spray machine body 2 side is bored in the spray machine body 2 side. Moreover, an airtight seal is interposed between the valve body 3 including the orifice 28 and the thermal spraying machine body 2, and when the valve body 18 rotates, the branch hole 27 connects to the inlet end 16 of the gas flow passage 15. At the same time as the communication, the outlet end 30 of the main hole 26 and the outlet side of the gas flow passage 15 become in communication via the orifice 28 and the compensating groove 29, and the valve body 18 rotates while maintaining the communication state. At this time, before the branch hole 27 of the main stream hole 26 is disconnected from the inlet end 16 of the gas flow passage 15, the inlet end 3 of the main stream hole 26
1 and an inlet end 16 of a gas flow passage 15 are disposed with each other so as to be in communication with each other. 2. A plug valve for a thermal spraying machine according to claim 1 of the utility model registration, which is provided with a plurality of orifices.