JP3025989B2 - 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 valve for shutting off or adjusting a flow rate of a fluid flow path, and more particularly to a valve for cleaning a space connected to a central flow path.

[0002]

2. Description of the Related Art Conventionally, various types of valves for shutting off a fluid passage or adjusting a flow rate are known. The one shown in FIG. 5 is a gate valve, which is typical as a valve for partitioning a flow path. In general, the gate valve has an operation rod fixed to the handle 41 by manually rotating the handle 41 when the center lines of the upstream flow path 5 and the downstream flow path 6 are aligned. The operation bar 26 is rotated, and the operation rod 26 itself, that is, the disc-shaped valve element 16 is moved up and down by the action between the screw 26a provided on the operation rod 26 and the screw portion 44a of the main body upper cover 44. , Between the upstream and downstream flow paths 5 and 6.

The advantages of this gate valve 40 are that it is extremely easy to handle because it has extremely low fluid resistance when fully opened, can be manufactured with a large-diameter size structurally, and has a small opening / closing torque. In this case, the vortex of the fluid is generated on the back side (downstream side 6) of the valve element 16 to increase the fluid resistance, and further causes vibration and wear, which is not suitable for adjusting the flow. Further, structurally, the opening / closing stroke is increased, the opening / closing time is increased, and it is not suitable for rapid opening / closing.

[0004]

The above-mentioned gate valve has the above-mentioned structure, advantages and disadvantages. However, the gate valve is not limited to this gate valve, and further has a space connected to the flow path at the center of the valve. Conventionally, the valve has the following problems. That is,
During long-term use, the more viscous the fluid used, the more severe the operating conditions such as temperature and pressure, and the more the suspended foreign matter in the fluid, the more foreign matter or the degraded residue of the fluid will remain in the space. There was a risk of stagnation and hindering opening and closing of the valve.

[0005] If the degradation residues and the like of foreign matter or fluid is disturbed on the operation of the valve staying in this space, to stop the flow of fluid, the upper part of the valve, for example, by the partition valve 40 of FIG. 5 cloud For example, the packing holder 42, the packing holding member 43, the main body upper cover 44, and the like have to be removed to clean the inside. Such an operation requires shutting down an apparatus using the valve, requires a great deal of cleaning time and labor, and is economically problematic.

An object of the present invention is a valve for shutting off a fluid flow path or adjusting a flow rate. The valve has a space connected to a flow path at the center of the valve. An object of the present invention is to provide a valve that does not retain degraded residues and the like.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a valve seat located in a central flow passage provided between an upstream flow passage and a downstream flow passage; A valve element that comes into contact with and separates from the seat to block the flow path or adjust the flow rate of the flow path,
A valve provided with a space connected to the center flow path, wherein the upstream flow path and the space are connected by a communication pipe communicating the upstream flow path and the space ; Upstream
The cross-sectional area of the flow path on the side is larger than the cross-sectional area of the flow path in the central portion.
It is a large one.

[0008]

Further, in the invention, the cross-sectional area of the upstream flow path is formed larger than the cross-sectional area of the central flow path. Are formed in a tapered shape whose diameter increases gradually from the inflow port to the inflow port of the upstream flow path.

[0010] In the above-mentioned invention, which is formed in a tapered shape in which the diameter gradually increases from the inlet of the flow passage in the central portion to the inlet of the flow passage on the upstream side, the shape of the downstream flow passage is It is formed in a taper shape symmetrically with the shape of the flow path on the side.

[0011]

According to the above construction, since the valve of the present invention is connected by a communication pipe for communicating the upstream flow path and the space, the pipe of the upstream flow path and the central flow path is connected. Due to the pressure difference, part of the fluid on the upstream side flows into the space through the communication pipe, flows from the space to the flow path in the center, and then flows to the flow path on the downstream side. The fluid does not stay, so that the foreign matter and the degraded residue of the fluid do not stay, so that the space of the valve can always be washed.

Further, in the above invention, since the cross-sectional area of the upstream flow path is formed to be larger than the cross-sectional area of the central flow path, the fluid flow velocity of the upstream flow path is lower than the central flow path. Is smaller than the fluid flow velocity of the flow path. Therefore, the Bernoulli's theorem substantially holds, and the pressure of the fluid in the upstream channel is higher than the pressure of the fluid in the central channel. At this time,
Since the upstream flow path and the space are connected by a communication pipe that communicates with the space, the fluid in the upstream flow path positively flows through the communication pipe toward the space, and the above operation is reliably performed. become.

Further, in the invention in which the cross-sectional area of the upstream flow path is formed larger than the cross-sectional area of the central flow path, the shape of the upstream flow path is the same as the flow path of the central flow path. Since it is formed in a tapered shape whose diameter gradually increases from the inlet to the inflow port of the upstream side flow path, the flow of the fluid in the upstream side flow path is performed quickly and no vortex is generated. ,
Low energy loss, and the fluid effectively flows from the upstream channel to the space through the communication pipe.

[0014] Then, the upstream side of the flow channel above invention formed into a tapered shape, the shape of the downstream side of the flow path, the one formed in a shape and symmetrically tapered upstream flow channel also , The upstream channel is tapered
The same action as made the invention.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the valve according to the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an embodiment of a valve according to the present invention, in which a valve is in a fully opened state, FIG. 2 is a sectional view of the embodiment in FIG. 1 in which a valve is in a half open state, and FIG. FIG. 4 is a cross-sectional view showing a state in which a valve element is in close contact with a valve seat to cut off a fluid flow path, and FIG. 4 is a cross-sectional view showing another embodiment corresponding to FIG.

FIGS. 1 to 3 show a flat plate stopper 2 showing an embodiment to which the valve of the present invention is applied. FIG. 1 shows a state in which the valve is fully open, FIG. 2 shows a state in which the valve is half open, and FIG. The child is in close contact with the valve seat and shuts off the fluid flow path. The flat plug 1 according to the present embodiment includes a valve seat 12 located in a central flow passage 7 provided between an upstream flow passage 5 and a downstream flow passage 6, and a valve seat 12 which comes into contact with and separates from the valve seat 12 and A valve 16 that shuts off the flow path 5 on the side and the flow path 6 on the downstream side or adjusts the flow rate of the flow path, and an operation member that is located when the valve 16 is fully opened or that operates the valve 16 A space 9 is provided, and the cross-sectional area of the upstream flow path 5 is formed larger than the cross-sectional area of the central flow path 7, and a communication that communicates the upstream flow path 5 with the space 9. They are connected by a pipe 3. In the present embodiment, the diameter of the flow path 7 at the center is gradually increased from the inlet 7a of the flow path 7 toward the inlet 5a of the flow path 5 on the upstream side. It is formed in a tapered shape symmetrically to the shape of the flow path 5 on the upstream side.

To further explain the structure of the flat plug 1 of this embodiment, the valve seat 12 is provided near the center of the flat plug 1 of the sleeve 14 and has a constant inclination angle α with respect to the flow direction 32 of the fluid.
In the case of the present embodiment, it has 90 °, and has the opening surface 13 in one direction of the fluid flow direction 32.

On the other hand, the valve element 16 has a flat plate 17 serving as a base of the valve element 16 and an elongated hole 19 provided in a back portion 18 of the flat plate 17, and has a support shaft 21 provided at one end of an operating rod 26. The valve element is held by a connecting member 20 for connecting a pin 29 which is a support shaft inserted through one end 19a of the long hole 19 of the valve element.
Further, the valve element 16 is provided with a support 23 extending from one end 17a of the flat plate 17 of the valve, and a support shaft 24 supported by the plug body 30 is inserted through a hole provided in the support 23. , This spindle 2
4 so as to be rotatable around. The initial inclination angle β of the flat plate 17 (FIG. 2) is set to 0 ° in the present embodiment, but may be set to an acute angle.

The flat plate 17 is made of a metal or other rigid material, and an elastic material 22 having a sealing property such as rubber or Teflon is fixed to the surface facing the valve seat 12 by baking or other means. . The elastic material 22 having the sealing property may be provided on the valve seat 12 side instead of being provided on the valve element 16 side.

The operating rod 26 can be moved in a direction perpendicular to the flow direction 32 of the fluid by a moving means (not shown), and moves the valve 16 around the support shaft 24 via the connecting member 20. Has a role to rotate. An O-ring 28a is provided on the support portion 28 of the stopper main body that supports the operation rod 26 to prevent leakage of the fluid and restrict the swing of the operation rod 26 in a direction parallel to the fluid flow direction 32. I have. O
The ring 28a is appropriately selected depending on conditions such as the type of fluid, pressure, and temperature. The valve element 16 is rotated around the support shaft 24 by the operation rod 26, and the valve element 16 contacts the valve seat 12,
The inclination angle β of the valve seat 12 is kept smaller than 90 ° with respect to the fluid flow direction 32 until the valve seat 12 is brought into close contact, and finally coincides with the inclination angle α of the valve seat 12. The inclination angle α and the initial inclination angle β are appropriately selected depending on the type of the fluid, the pressure, the density, the flow rate, the size of the flat plug, and the like.

The flat plug 1 according to the present embodiment having the above-described structure.
Works as follows. That is, the cross-sectional area S of the upstream flow path 5 is formed larger than the cross-sectional area s of the flow path 7 at the central portion of the flat plug, and the communication pipe for communicating the upstream flow path 5 with the space 9. 3, the upstream flow path 5
Is smaller than the fluid flow velocity in the central flow path 7, and Bernoulli's theorem substantially holds as long as the fluid is regarded as incompressible and non-viscous under practical use conditions.
Therefore, the pressure of the fluid in the upstream channel 5 is reduced by the central channel 7.
Fluid pressure. At this time, if the upstream side flow path 5 and the space portion 9 are connected by the communication pipe 3 for communication,
The fluid in the upstream channel 5 flows through the communication pipe 3 toward the space 9.

The space 9 is provided with an operating rod 26 and an operating member 26 which are operating members located in the space 9 when the flat plug is fully opened.
0, since the support shaft 21 and other members are located, foreign substances in the fluid and degraded residues of the fluid are liable to stagnate, but the space 9 constantly flows due to the inflow of the fluid from the upstream flow path 5. I will be. Then, the fluid flows from the space 9 to the flow path 7 at the center and then to the flow path 6 on the downstream side, so that the fluid does not stay in the space 9, so that foreign matters and degraded residues of the fluid stay there. The cleaning of the space portion 9 of the flat plug can be performed without the need for cleaning.

Further, the upstream channel 5 is provided with a central channel 7.
Is formed in a tapered shape whose diameter increases gradually from the inflow port 7a of the upstream to the inflow port 5a of the upstream flow path 5, so that the flow of the fluid in the upstream flow path 5 is performed promptly. There is no generation of eddies and the like, the energy loss is small, and the fluid effectively flows from the upstream flow path 5 to the space 9 through the communication pipe 3.

[0024]

The operation of the valve 16 using a flat plate is as follows. That is, in FIGS.
However, in the fully open state, the valve 16 is
In the space 9 where this is avoided, the initial inclination angle β with respect to the flow direction 32 of the fluid, that is, 0 ° in this embodiment, is maintained. At this time, the fluid flows from the upstream channel 5 to the downstream channel 6 with very little resistance. Next, when adjusting the flow rate of the fluid, when the operating rod 26 is moved by a moving device (not shown) below in FIG. 1, the valve element 16 rotates around the support shaft 24 and one end 17 b of the flat plate 17. From the state where has reached the flow path 7 in the center,
The resistance of the central channel 7 starts to increase, and the flow rate is adjusted. Further, when the operation rod 26 is moved downward, the valve 16
Rotates around the support shaft 24 (FIG. 2). In this state, the flow rate of the fluid is considerably reduced, but the resistance of the central flow path 7 is relatively small.

When the operating rod 26 is further depressed, the pin 29, which is the support shaft of the connecting member 20 connected to the tip of the operating rod 26 via the support shaft 21, is moved from one end 19a of the elongated hole 19 to the other end. 19b, the inclination angle β of the flat plate 17
Approaching the inclination angle α, and further depressing the operating rod 26, the inclination angle β of the flat plate 17 matches the inclination angle α, and the valve element 16 comes into contact with the valve seat 12, as shown in FIG. In this state, the valve element 16 is in close contact with the valve seat 12 by the pressing force of the operation rod 26 and the pressure of the fluid in the flow path 7 at the center, but the pin 29 is located downstream of the central axis 27 of the operation rod 26. Since it is located on the right side of the center axis 27 in the flow path, that is, in FIG. 3, by further depressing the operation rod 26,
The valve element 16 and the valve seat 12 are closely attached and tightened, and completely shut off the flow of the fluid. In the flat plug 1 of the present embodiment, the design of the operating rod 26 is, for example, when the fluid pressure is 250 mmAq, and the inner diameter of the flange portion of the upstream or downstream flow path is 75 A,
It is about 1.1 kgf, which is relatively small.

The valve element 16 of this embodiment operates as follows. That is, in FIG. 3, in a state where the valve 16 is tightly tightened to the valve seat 12, for some reason,
Even when the pressure in the downstream flow path 6 becomes higher than the pressure in the upstream flow path 5, the valve 16 is more tightly attached to the valve seat 12, thereby preventing backflow. That is, it works the same as the conventional check valve. Further, the valve 16
Rotates and approaches the valve seat 12 in an oblique state, and comes into close contact with the valve seat 12 to block the upstream channel 5 and the downstream channel 6.
It functions the same as the conventional gate valve 40 of FIG. Further, when the fluid is flowing from the downstream flow path 6 to the upstream flow path 5, by operating the operation rod 26, the valve 16 acts to suppress the flow of the fluid, and the conventional ball-shaped Works like a valve. Therefore, the flat plug 1 of this embodiment has the functions of the conventional globe valve, gate valve and check valve, and also has the function of retightening the valve.

[0028] Further, the flat plate plug 1 of this embodiment, as the shape of the opening surface 13 及 beauty valve member flat plate 17 of the valve seat 12 is not particularly limited, cylindrical the shape of the valve seat near the sleeve 14, If it cuts perpendicularly to this cylindrical axis and makes the opening surface 13 of a valve seat circular and the shape of the valve plate 17 is also made circular, it can manufacture accurately and economically.

The flat plug 1 of this embodiment is a valve which can be used for both emergency shutoff and normal flow control, has good open / close operability, and has a fluid resistance when fully opened. In addition to providing a valve that is small, has a large closing capacity, and can be manufactured economically in various sizes, the operation of the flat plug is further ensured.

In the present embodiment, the shape of the lower inner wall 31 of the plug main body 30 is linear along the flow direction 32 of the fluid, so that the fluid near the lower inner wall 31 of the plug main body 30 continuously flows through the fluid. Flowing in the direction 32, floating foreign matter in the fluid does not accumulate and does not hinder the close contact between the valve element 16 and the valve seat 12.

FIG. 4 is a sectional view showing another embodiment of the flat plug corresponding to FIG. In the flat plug according to the embodiment shown in FIGS. 1 to 3, the shape of the upstream and downstream flow paths is tapered, but the flat plug 1 according to the present embodiment has the upstream and downstream flow paths 5. , 6 are the same. Also in such a flat plug, for example, the valve 16 is half-opened with respect to the valve seat 12 by connecting the upstream channel 5 and the space 9 with the communication pipe 3 as shown in FIG. In the case, the flow path 7 in the central part
Flow rate is increased, and the same effect as in the embodiment shown in FIGS. 1 to 3 is exhibited, a pressure difference is generated between the upstream flow path 5 and the central flow path 7, and the upstream flow path 5 Then, the fluid flows through the communication pipe 3 to the flow path 7 at the center, and the space 9 can be washed.

Although the present invention has been described in detail with reference to the illustrated embodiments, the present invention is not limited to only those embodiments, and various modifications can be made without departing from the spirit of the present invention. In addition, it goes without saying that a wide variety of modifications can be made.

[0033]

According to the valve of the present invention, the flow path on the upstream side and the space
The so being connected by a communicating pipe, the pressure difference between the upstream flow path and the central portion of the flow path, a part of the upstream side of the fluid is long in the space through the communication pipe, the space The fluid does not stay in the portion, so that no foreign matter or degraded residue of the fluid stays in the portion, so that the space of the valve can always be cleaned.

Furthermore, since the cross-sectional area of the flow path on the upstream side is one that is larger than the cross-sectional area of the flow path of the central portion,
Fluid upstream of the flow passage is a flow positively through the communicating pipe towards the space.

Further, in the invention in which the cross-sectional area of the upstream-side flow path is formed larger than the cross-sectional area of the central-side flow path, the shape of the upstream-side flow path is the inlet of the central-side flow path. Since it is formed in a tapered shape in which the diameter gradually increases from the upstream to the inflow port of the flow path, in addition to the effect of the above invention, the flow of the fluid in the upstream flow path is rapidly performed. There is no eddy or the like, and there is little energy loss.

[0036] Then, the upstream side of the flow channel above invention formed into a tapered shape, the shape of the downstream side of the flow path, the one formed in a shape and symmetrically tapered upstream flow channel also , The upstream channel is tapered
It has made the invention and similar effects.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a valve according to the present invention, in which a valve element is fully opened.

FIG. 2 is a cross-sectional view of the embodiment of FIG.

FIG. 3 is a cross-sectional view of the embodiment of FIG. 1 in which a valve element is in close contact with a valve seat and a fluid flow path is blocked.

FIG. 4 is a sectional view showing another embodiment corresponding to FIG. 1;

FIG. 5 is a cross-sectional view illustrating a gate valve according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flat plug 3 Communication pipe 5 Upstream flow path 6 Downstream flow path 7 Central flow path 9 Space part 12 Valve seat 16 Valve

Claims (3)

(57) [Claims] 1. A valve seat located in a central flow passage provided between an upstream flow passage and a downstream flow passage, and the flow passage is shut off by contacting with or separating from the valve seat. A valve for adjusting the flow rate of
A valve provided with a space connected to the center flow path, wherein the upstream flow path and the space are connected by a communication pipe communicating the upstream flow path and the space ; Upstream
The cross-sectional area of the flow path on the side is larger than the cross-sectional area of the flow path in the central portion.
A valve characterized by being formed large . 2. The shape of the flow path on the upstream side according to claim 1 , wherein the shape of the flow path on the upstream side is a taper shape in which a diameter increases sequentially from an inlet of the flow path on the central portion toward an inlet of the flow path on the upstream side. A valve characterized in that it is formed. 3. The valve according to claim 2, wherein the shape of the flow path on the downstream side is tapered symmetrically with the shape of the flow path on the upstream side.