JP3318221B2 - Three-way valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-way valve for controlling a fluid in a system having a three-way pipe.

[0002]

2. Description of the Related Art A three-way valve is used as a valve for controlling a fluid in a system having a three-way pipe, for example, in temperature control of a fluid by a heat exchanger. There are two types of three-way valves: a mixed three-way valve that mixes two systems of fluid into one system and a split three-way valve that divides one system of fluid into two systems. FIG. 5 is a sectional view showing a conventional split type three-way valve. In the figure, reference numeral 1 denotes a valve box, 2 denotes an upper cover of the valve box 1, 3 denotes a lower cover of the valve box 1, and upper and lower lids 2 and 3 It is fixed to the valve box 1 by bolts. 4 is an inflow passage formed in the valve box 1, 5 is a first outflow passage formed in the valve box 1, and 6 is a second outflow passage formed in the valve box 1.
The outflow path is formed by the lower lid 3 in FIG. Reference numeral 7 denotes an upper plug that controls the flow of the fluid from the inflow path 4 to the first outflow path 5, 8 denotes a lower plug that controls the flow of the fluid from the inflow path 4 to the second outflow path 6, The upper plug 7 and the lower plug 8 are formed in a shape connected by the connection portion 13. 9 is an upper seat ring that slidably supports the upper plug 7, 10 is a lower seat ring that slidably supports the lower plug 8, and 11 is connected to a valve actuator (not shown). A valve shaft for transmitting the driving force of the valve operating device to the side plug 8;
Is a guide ring that slidably supports.

As shown in the figure, the upper plug 7 has an upper base 7a in the figure and four lower legs 7b in the figure, for example. It has a circular outer periphery of the same diameter, and the outer diameter of the leg portion 7b is substantially matched with the base portion 7a so as to slide along the upper seat ring 9. Similarly, the lower plug 8 also has a lower base 8a in the figure and four upper legs 8b in the figure, for example.

Next, the operation will be described. In the case where all the fluid flows into the first outflow channel 5 without flowing into the second outflow channel 6,
The upper plug 7 and the lower plug 8 are arranged at the upper limit positions as shown in FIG. In this upper limit position, the upper plug 7
, The maximum amount of fluid passes from the inside to the outside through the gap between the leg portions 7b and flows to the first outflow passage 5, and in the lower plug 8, the base portion 8a and the lower seat ring 10 come into contact with each other. As a result, the flow of the fluid to the second outflow path 6 is closed. As described above, all the fluid flowing from the inflow channel 4 is discharged to the first outflow channel 5
Is washed away.

[0005] All of the fluid flows into the second outflow channel 5 without flowing through the first outflow channel 5.
When flowing into the outflow passage 6, the upper plug 7 and the lower plug 8 are arranged at the lower limit position. At this lower limit position, in the lower plug 8, the fluid passes through the gap between the leg portions 8 b from the inside to the outside through the maximum amount and flows to the second outflow passage 6, and in the upper plug 7, the base portion 7 a and the upper By the contact with the seat ring 9, the flow of the fluid to the first outflow path 5 is closed.
As described above, all the fluid flowing from the inflow path 4 flows into the second outflow path 6.

When the fluid flows through the first outflow channel 5 and the second outflow channel 6 at a predetermined ratio, the upper plug 7 and the lower plug 8 are disposed at predetermined positions between the upper limit position and the lower limit position. You. In this predetermined position, the upper plug 7
From the upper seat ring 9 in the gap between the legs 7b.
Fluid passes from the inside to the outside through the lower seat ring 10 and the base portion 8a side from the lower seat ring 10 in the gap between the leg portion 8b of the lower plug 8 to the first outflow channel 5 and the second outflow channel 6. Flows. As described above, the fluid flowing from the inflow path 4 flows into the first outflow path 5 and the second outflow path 6 at a predetermined ratio.

The above-mentioned movement of the upper plug 7 and the lower plug 8 between the respective positions is performed by driving a valve operating device (not shown) connected to the valve shaft 11, thereby controlling the flow of the target fluid. Will be

At this time, it is necessary that the valve shaft composed of the valve shaft 11 that moves up and down and the upper plug 7 and the lower plug 8 be appropriately guided.
Is guided by the guide ring 12, and the guiding of the valve body is performed by any of the inside of the upper seat ring 9 and the outside of the upper plug 7, and the inside of the lower seat ring 10 and the outside of the lower plug 8. This is done by keeping almost always in contact even at the position.

[0009]

Since the conventional split-type three-way valve is configured as described above, the guiding of the valve body composed of the upper plug and the lower plug is performed by connecting the outer periphery of each plug to the seat ring. Since the contact is performed, the shape of the plug is limited in order to secure the guide area of each plug, and therefore, there is a problem that the flow characteristics cannot be arbitrarily designed.

[0010] Further, since the shape of the plug needs to be a complicated shape having a base portion and a leg portion, the plug cannot be formed by continuous cutting using a lathe or the like.
There was a problem that complicated intermittent cutting had to be performed and the manufacturing cost increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to appropriately guide a valve body and to easily design and process a flow rate characteristic of the valve body. and vibration to the valve body is rather difficulty occurs, also, Ran
It is an object of the present invention to provide a three-way valve capable of preventing flow generation and maintaining a large valve capacity .

[0012]

SUMMARY OF THE INVENTION A three-way valve according to the present invention is provided with a fluid inflow passage, a first outflow passage and a second outflow passage through which fluid flows in from the inflow passage, and a valve through a valve shaft. A three-way valve comprising an upper plug, a lower plug, and an intermediate portion connecting these plugs, wherein the upper plug is a third valve from the inflow path side. 1 is formed in a contour shape having a portion whose diameter gradually increases toward the outflow path side, and the flow of the fluid flowing from the inflow path to the first outflow path is adjusted at a distance from the upper seat ring. The lower plug is formed in a contoured shape having a portion whose diameter gradually increases from the inflow path side to the second outflow path side, so that the second plug of the fluid flowing from the inflow path is formed. The flow to the outflow channel is the lower sheet Together to be regulated by the distance between the ring, the intermediate portion connecting the upper plug and lower plug configured to guide a plug guide, and, the plug guide, fluid in the inflow path How to flow
It is supported and fixed by a stay formed in a wing shape along the direction .

[0013]

[0014]

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a cross-sectional view showing a three-way valve according to Embodiment 1 of the present invention. In the drawing, reference numeral 1 denotes a valve box, 2 denotes an upper cover of the valve box 1, 3 denotes a lower cover of the valve box 1, and The lid 3 is fixed to the valve box 1 by bolts. 4 is an inflow path formed in the valve box 1, 5 is a first outflow path formed in the valve box 1, 6 is a second outflow path formed in the valve box 1, and the lower lid in FIG. 3. Reference numeral 11 denotes a valve shaft which is connected to a valve operating device (not shown), and transmits a driving force of the valve operating device to the plug 15, and reference numeral 12 denotes a guide ring which slidably supports the valve shaft 11. The above is the same as that of the conventional three-way valve shown in FIG.

Numeral 15 denotes a contoured plug (valve element) for regulating the flow of the fluid from the inflow path 4 to the first outflow path 5 and the second outflow path 6.
It is formed in a shape having a lower plug portion 15b and an intermediate portion 15c. The plug 15 shown in FIG.
The upper plug portion 15a and the intermediate portion 15c are integrally formed, and the lower plug portion 15b is connected thereto.

Reference numeral 16 denotes a plug guide for guiding the plug 15, 17 denotes a stay for supporting and fixing the plug guide 16, 17 a denotes a pedestal of the stay 17, and 18 abuts against the upper plug portion 15 a of the plug 15 to close the fluid. The upper seat ring 19 is the lower plug 1 of the plug 15
5b is a lower seat ring that closes a fluid by contacting the lower ring 5b.

The intermediate portion 15c of the plug 15 is formed to have a columnar portion having a constant diameter so that appropriate guiding can be performed by the plug guide 16. The upper plug portion 15a is formed so as to have a portion that is larger than the diameter of the intermediate portion 15c and gradually increases beyond the inner diameter of the upper seat ring 18. Is closed. Similarly, the lower plug portion 15b is larger than the diameter of the intermediate portion 15c,
The lower seat ring 19 is formed so as to have a portion that gradually increases beyond the inner diameter thereof, and closes the flow of the fluid by contact with the lower seat ring 19.

FIG. 2 is a sectional view taken along the line AA in FIG. 1 showing the configuration of the plug guide 16 and the stay 17 of the three-way valve according to the first embodiment of the present invention. The plug guide 16 guides the intermediate portion 15c of the plug 15 from the periphery, and four stays 1 provided around the plug guide 16 are provided.
7, the plug guide 16 is held. The stay 17 is provided on a pedestal 17a having a recess on the lower surface. In mounting the plug guide 16, first, the pedestal 17 a to which the plug guide 16 and the stay 17 are mounted is fitted with the concave portion provided on the lower surface thereof into the convex portion 3 a provided on the lower lid 3. It is placed on top and then this lower lid 3 is bolted to the valve box 1. At this time, the pedestal 17 is located between the lower lid 3 and the valve box 1.
a is sandwiched, and the plug guide 16 is firmly fixed. Note that the method of fixing the plug guide 16 and the stay 17 shown here is an example, and for example, a configuration in which the pedestal 17a is simply sandwiched between the lower lid 3 and the valve box 1 without providing the convex portion 3a or the like, Various configurations such as a configuration in which screws are used are possible.

Next, the operation will be described. In the case where all the fluid flows into the first outflow channel 5 without flowing into the second outflow channel 6,
The plug 15 is arranged at the upper limit position as shown in FIG.
In this upper limit position, a maximum amount of fluid flows between the upper plug portion 15a and the upper seat ring 18 and flows to the first outflow passage 5, while the lower plug portion 15b and the lower seat ring 1
9 abuts and the flow of fluid to the second outflow channel 6 is closed.

Without flowing the fluid through the first outflow channel 5,
When flowing into the outflow passage 6, the plug 15 is arranged at the lower limit position as shown in FIG. In this lower limit position, a maximum amount of fluid passes between the lower plug portion 15b and the lower seat ring 19 and flows to the second outflow passage 6, while the upper plug portion 1
5a and the upper seat ring 18 are in contact with each other, and the flow of the fluid to the first outflow passage 5 is closed.

When the fluid flows through the first outflow channel 5 and the second outflow channel 6 at a predetermined ratio, the plug 15 is disposed at a predetermined position between the upper limit position and the lower limit position as shown in FIG. . In this predetermined position, fluid flows between the upper plug portion 15a and the upper seat ring 18 and the lower plug portion 15a.
b and the lower seat ring 19, and flows into the first outflow channel 5 and the second outflow channel 6 at a predetermined ratio.

The above-mentioned movement of the plug 15 between the respective positions is performed by driving a valve operating device (not shown) connected to the valve shaft 11, thereby controlling the flow of the target fluid. At this time, the valve shaft 11 that moves up and down is guided by the guide ring 12 and the like, and the plug 15 as the valve body guides the columnar portion having a constant diameter of the intermediate portion 15 c by the plug guide 16. Is done.
In this case, since the guiding of the plug 15 is performed at an upper and lower intermediate position of the plug 15, vibrations due to the fluid can be easily prevented.

The stay 17 of the plug guide 16 preferably has a small cross-sectional area across the flow path so as not to obstruct the fluid flowing in the inflow path 4. For example, as shown in FIGS. By providing the wings 17 in a wing shape along the flow direction of the fluid in the inflow channel 4, the stay 17 is provided with the fluid from the inflow channel 4 to the first outflow channel 5 and from the inflow channel 4 to the second outflow channel 6. A rectifying effect for preventing the occurrence of turbulence in the flow can be provided, and the valve capacity can be kept large.

As described above, according to the first embodiment, the guiding of the plug 15 is performed at the intermediate portion 15c instead of the guiding of the valve at the flow rate characteristic portion of the valve as in the related art. As a result, the valve body can be made into a contour type without any restriction on the shape of the plug 15, thereby providing an effect that a design having an arbitrary flow characteristic can be realized.

Further, since the shape of the valve body is not a complicated shape having a conventional base portion and a leg portion but a simple contoured shape, continuous cutting using a lathe or the like can be easily performed. This makes it possible to reduce the manufacturing cost and to easily perform the surface hardening treatment because of the simple shape. Further, since the plug guide 16 is provided at the middle position between the upper and lower portions of the plug 15, there is an effect that the vibration generated by the fluid can be easily prevented. Furthermore, the stay 17 can be provided with a rectifying effect for preventing the occurrence of turbulence in the flow of the fluid, thereby providing an effect of maintaining a large valve capacity.

It is also possible to apply the plug guide 16 to the connection portion 13 of the valve element as shown in the conventional example, instead of using a contoured valve element such as the plug 15 described above. In this case, too, needless to say, the vibration generated by the fluid can be easily prevented.

The configuration of the stay 17 of the plug guide 16 described above can be replaced with another configuration other than the above, and the manner of mounting the stay 17 can be variously changed as described above. Needless to say.

In the above description, the operation and the like have been described as a split type three-way valve. However, when the differential pressure is extremely small, the above three-way valve can be used for mixing fluids. Needless to say.

[0030]

As described above, according to the present invention, both the upper and lower plugs are formed in a contour shape having a portion whose diameter gradually increases from the inflow path side to the first and second outflow path sides. In addition, no irregular force acts on the plug due to the flow of the fluid, and therefore, there is an operational effect that vibration is hardly generated in the valve body. In addition, since the middle part that connects the upper and lower plugs is guided by the plug guide, vibration is more unlikely to occur in the valve body, and it is not necessary to secure a guide area in the flow rate characteristic part of the valve body, and the plug design is reduced. The width can be widened, and there is an effect that a design having an arbitrary flow characteristic can be realized. In addition, the contoured plug as described above,
Processing can be easily performed by continuous cutting with a lathe or the like, which has the effect of reducing manufacturing costs and facilitating surface hardening treatment. Also, the stay for supporting and fixing the plug guide is provided along the flow direction of the fluid in the inflow passage.
Since it formed in the wing shape with Tsu, the wing-like stearyl
Can have a rectifying effect for preventing the occurrence of turbulent flow of the fluid, and this has the effect that the valve capacity can be kept large.

Further, it is possible to use a valve body having a simple shape instead of a complicated shape having a base portion and a leg portion as in the prior art, and it is possible to easily perform a surface hardening treatment of the valve body. There is an effect.

[0032]

[0033]

[0034]

[Brief description of the drawings]

FIG. 1 is a sectional view showing a three-way valve according to Embodiment 1 of the present invention, showing a state where a plug is arranged at an upper limit position.

FIG. 2 is a sectional view taken along line AA in FIG. 1 showing a configuration of a plug guide and a stay of the three-way valve according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view showing the three-way valve according to Embodiment 1 of the present invention, showing a state where a plug is arranged at a lower limit position.

FIG. 4 is a cross-sectional view showing the three-way valve according to the first embodiment of the present invention, showing a state where a plug is arranged at an intermediate position.

FIG. 5 is a sectional view showing a conventional split type three-way valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve box 4 Inflow path 5 1st outflow path 6 2nd outflow path 11 Valve shaft 15 Plug (valve element) 15a Upper plug part 15b Lower plug part 15c Intermediate part 16 Plug guide 18 Upper seat ring 19 Lower seat ring

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-54-12021 (JP, A) JP-A-60-215169 (JP, A) JP-A-8-93925 (JP, A) 25674 (JP, U) Jiko 36-16375 (JP, Y1) Jiko 46-5755 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16K 11/048

Claims (1)

(57) [Claims] 1. An inflow passage provided in a valve box and into which fluid flows, a first outflow passage provided in the valve box and outflowing fluid, and a fluid outflow provided in the valve box and provided in the valve box. A three-way valve including a second outflow passage and a valve element driven by a valve actuator via a valve shaft, the valve element including an upper plug, a lower plug, and an intermediate portion connecting the plugs; And a plug guide for guiding the intermediate portion, wherein the upper plug is formed in a contoured shape having a portion whose diameter gradually increases from the inflow path side toward the first outflow path side, The flow of the fluid flowing from the inflow path to the first outflow path is adjusted by a distance from an upper seat ring, and the lower plug has a diameter from the inflow path side to the second outflow path side. Has a portion that gradually increases It is formed into Contoured shape, wherein is the flow of the second outflow path of the fluid flowing from the inflow passage intended to adjust the distance between the lower sheet ring, the plug guide, fluid in the inflow path In the direction of flow
A three-way valve characterized by being supported and fixed by a stay formed in a wing shape along the same .