JPH0835582A - Valve - Google Patents

Abstract

PURPOSE:To provide a flat plate cock which is constituted so that foreign materials and the deteriorated residue, etc., of fluid are not allowed to stay in a space part which communicates to a flow passage at the center part. CONSTITUTION:As for a flat plate cock equipped with a valve seat 12 positioned in a flow passage 7 at the center part which is formed between an upstream side flow passage 5 and a downstream side flow passage 6, valve piece 16 which cuts the flow passage through the contact and separation with the valve seat 12 or adjusts the flow rate in the flow passage, and a space part 9 which communicates to the flow passage 7 at the center part, the sectional area of the flow passage 5 on the upstream side is set larger than that of the flow passage 7 at the center part, and the flow passage 5 on the upstream side and the space part 9 are connected by a communication pipe 3.

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 a fluid passage or adjusting a flow rate, and more particularly to a valve capable of cleaning a space portion connected to a central passage.

[0002]

2. Description of the Related Art Conventionally, various valves have been known for shutting off a fluid passage or adjusting a flow rate. The valve shown in FIG. 5 is a sluice valve (gate valve), which is typical as a valve for shunting a flow path. In this sluice valve 40, the center lines of the upstream flow passage 5 and the downstream flow passage 6 are generally aligned, and the operating rod fixed to the handle 41 by manually rotating the handle 41. 26 is rotated to move the operating rod 26 itself, that is, the disc-shaped valve element 16 up and down by the action between the screw 26a provided on the operating rod 26 and the screw portion 44a of the main body upper cover 44. The flow paths 5 and 6 on the upstream side and the downstream side are shut off from each other.

The merits of this sluice valve 40 are that the fluid resistance at the time of full opening is extremely small, a structurally large size can be manufactured, the opening and closing torque is small, and the valve is very easy to handle. Then, since a fluid vortex is generated on the back side (downstream side 6) of the valve element 16 to increase the fluid resistance and further cause vibration and wear, it is not suitable for flow regulation. Further, there are disadvantages such that the opening and closing stroke is large due to the structure, the opening and closing time is increased, it is not suitable for rapid opening and closing, and it is difficult to manufacture in the case of a small diameter.

[0004]

Although the sluice valve has the structure and advantages and disadvantages as described above, it is not limited to this sluice valve but has a space portion connected to the flow passage in the central portion of the valve. Conventionally, the valve has the following problems. That is,
The more viscous the fluid is, the more severe the operating conditions such as temperature and pressure, and the more foreign particles floating in the fluid during long-term use, the more foreign matter or deterioration residue of fluid in the space. There was a risk that it would stay and hinder the opening and closing of the valve.

When foreign matter or fluid deterioration residue, etc., accumulates in this space and interferes with the operation of the valve, the flow of the fluid is stopped and the upper part of the valve, such as the sluice valve 40 in FIG. 4, is called. For example, the packing retainer 42, the packing holding member 43, the main body upper cover 44 and the like had to be removed to clean the inside. Such an operation requires a great deal of time and labor for cleaning, as well as stopping the apparatus using this valve, which is economically problematic.

An object of the present invention is a valve for shutting off a fluid flow path or adjusting a flow rate, and in a valve having a space part connected to the flow path in the central part of the valve, foreign matter and fluid It is to provide a valve in which deterioration residue and the like do not stay.

[0007]

In order to solve the above-mentioned problems, the present invention provides a valve seat located in a central channel provided between an upstream flow passage and a downstream flow passage, and a valve seat for the valve seat. A valve that blocks the flow path by contacting with or separating from the seat or adjusts the flow rate of the flow path;
In a valve provided with a space part connected to the flow path in the central part, the flow path on the upstream side and the space part are connected by a communication pipe.

Further, in the above invention, the cross-sectional area of the upstream flow passage is larger than the cross-sectional area of the central flow passage.

Further, in the invention in which the cross-sectional area of the upstream flow passage is larger than the cross-sectional area of the central flow passage, the shape of the upstream flow passage is the central flow passage. From the inflow port to the inflow port of the upstream side flow channel, the diameter of which gradually increases.

In the invention having a tapered shape in which the diameter is gradually increased from the inlet of the central flow passage to the inlet of the upstream flow passage, the shape of the downstream flow passage is the upstream. It is formed in a tapered shape symmetrical with the shape of the flow path on the side.

[0011]

With the above structure, since the valve of the present invention connects the upstream flow passage and the space portion by the communication pipe, the upstream flow passage and the central flow passage are connected. Due to the pressure difference of, a part of the fluid on the upstream side flows to the space through the communication pipe, flows from the inside of the space to the flow passage in the central portion, and then to the flow passage on the downstream side. Since the fluid does not stay, foreign matter and deterioration residue of the fluid do not stay, and the space of the valve can always be cleaned.

Further, in the above invention, since the cross-sectional area of the upstream flow passage is formed larger than the cross-sectional area of the central flow passage, the fluid flow velocity of the upstream flow passage is Is smaller than the fluid flow velocity in the channel. Therefore, Bernoulli's theorem holds substantially, and the pressure of the fluid in the upstream flow path becomes even greater than the pressure of the fluid in the central flow path. This time,
Since the flow passage on the upstream side and the space portion are connected by a communication pipe that communicates with each other, the fluid in the flow passage on the upstream side positively flows through the communication pipe toward the space portion to ensure the above operation. become.

Further, in the invention in which the cross-sectional area of the upstream flow passage is larger than the cross-sectional area of the central flow passage, the shape of the upstream flow passage is that of the central flow passage. Since it is formed in a tapered shape whose diameter gradually increases from the inlet to the inlet of the upstream flow passage, the fluid flow in the upstream flow passage is swift, and eddies do not occur. ,
The energy loss is small, and the fluid effectively flows through the communication pipe from the upstream flow path toward the space.

Further, in the above invention in which the upstream side flow path is formed in a tapered shape, the downstream side flow path is formed in a tapered shape symmetrical with the upstream side flow path. Therefore, in addition to the above operation, the valve has good durability and is easy to manufacture.

[0015]

Embodiments of the valve of the present invention will now be described in detail with reference to the drawings. 1 shows an embodiment of a valve according to the present invention, a sectional view of a valve element in a fully opened state, FIG. 2 is a sectional view of a valve element in a partially opened state in the embodiment of FIG. 1, and FIG. 4 is a sectional view showing a state in which the valve element is in close contact with the valve seat to block the flow path of the fluid, and FIG. 4 is a sectional view showing another embodiment corresponding to FIG.

FIGS. 1 to 3 show a flat plug 2 showing an embodiment to which the valve of the present invention is applied. FIG. 1 is a state in which the valve is fully opened, FIG. 2 is a state in which the valve is half opened, and FIG. 3 is a valve. The child is in close contact with the valve seat and blocks the fluid flow path. The flat plate plug 1 of the present embodiment includes a valve seat 12 located in a central flow path 7 provided between an upstream flow path 5 and a downstream flow path 6, and a valve seat 12 which is brought into contact with and separated from the valve seat 12 to upstream. There is a valve element 16 that shuts off the side flow path 5 and the downstream side flow path 6 or adjusts the flow rate of the flow path, and an operation member that is located when the valve element 16 is fully opened or that operates the valve element 16. The flow path 5 on the upstream side has a cross-sectional area larger than the cross-sectional area of the flow path 7 on the center side, and the flow path 5 on the upstream side communicates with the space section 9. It is connected by a pipe 3. In the present embodiment, the diameter of the flow passage 7 in the central portion is gradually increased from the inflow port 7a of the flow passage 7 toward the inflow port 5a of the upstream flow passage 5, and the shape of the downstream flow passage 6 is as follows. It is formed in a tapered shape symmetrical with the shape of the flow path 5 on the upstream side.

The structure of the flat plate plug 1 of the present embodiment will be further described. The valve seat 12 is provided near the center of the flat plate plug 1 of the sleeve 14 and has a constant inclination angle α with respect to the fluid flow direction 32.
In the case of this embodiment, the angle is 90 °, and the opening surface 13 is provided 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 a support shaft 21 provided at one end of an operating rod 26. It is held by a connecting member 20 that connects with a pin 29 that is a support shaft that is inserted through one end 19a of the elongated hole 19 of the valve element.
Further, the valve element 16 is provided with a support piece 23 extending from one end 17a of a flat plate 17 of the valve element, and a support shaft 24 supported by the plug body 30 is inserted through a hole provided in the support element 23. , This support shaft 2
It is rotatably supported around 4. The initial inclination angle β (FIG. 2) of the flat plate 17 is set to 0 ° in this 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 adhesion or other means. . The elastic material 22 having the sealing property may be provided on the valve seat 12 side instead of on the valve element 16 side.

The operating rod 26 is movable by a moving means (not shown) in a direction perpendicular to the fluid flow direction 32, and the valve element 16 is moved around the support shaft 24 via the connecting member 20. Has the role of rotating. An O-ring 28a is provided on the support portion 28 of the stopper body that supports the operation rod 26 to prevent the fluid from leaking and regulate the swing of the operation rod 26 in the direction parallel to the fluid flow direction 32. There is. 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 so that the valve element 16 contacts the valve seat 12.
Until they come into close contact with each other, the inclination angle β of the valve seat 12 is smaller than the inclination angle α of 90 ° with respect to the flow direction 32 of the fluid, and finally the inclination angle α of the valve seat 12 matches. The inclination angle α and the initial inclination angle β are appropriately selected depending on the type of fluid, its pressure, density and flow rate, and the size of the flat plate stopper.

The flat plate stopper 1 of the present embodiment having the above construction
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 in the central portion of the flat plate stopper, and the communication pipe that connects the upstream flow path 5 and the space 9 is formed. Since it is connected by 3, the flow path 5 on the upstream side
Is smaller than the fluid flow velocity of the central passage 7, and Bernoulli's theorem is generally valid as long as the fluid is considered to be incompressible and inviscid under practical use conditions.
Therefore, the pressure of the fluid in the flow passage 5 on the upstream side is
Will be greater than the fluid pressure. At this time, if the upstream flow path 5 and the space portion 9 are connected by the communication pipe 3 that communicates with each other,
The fluid in the flow path 5 on the upstream side flows toward the space 9 through the communication pipe 3.

The space portion 9 is an operation member located in the space portion 9 when the flat plate stopper is fully opened, and the operation rod 26 and the connecting member 2 are provided.
0, the support shaft 21, and other members are located, so that foreign matter in the fluid, deterioration residue of the fluid, and the like are likely to accumulate, but the space portion 9 always flows due to the inflow of the fluid from the upstream flow path 5. Come to do. Then, the fluid flows from the inside of the space 9 to the flow passage 7 in the central portion and then to the flow passage 6 on the downstream side, so that the fluid does not stay in the space 9 and therefore foreign matters and deterioration residues of the fluid stay. It is possible to clean the space 9 of the flat plate stopper without doing so.

Further, the flow path 5 on the upstream side is the flow path 7 in the central portion.
Since the diameter is gradually increased from the inflow port 7a to the inflow port 5a of the upstream flow path 5, the fluid in the upstream flow path 5 is swiftly flowed. Vortices are not generated, the energy loss is small, and the fluid effectively flows from the flow path 5 on the upstream side to the space 9 through the communication pipe 3.

Since the shape of the downstream side flow passage 6 is formed in a tapered shape symmetrical to the shape of the upstream side flow passage 5, the valve is durable and can be manufactured easily in addition to the above-mentioned action. It's easy.

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

Further, when the operation rod 26 is pushed down, the pin 29 which is the support shaft of the connecting member 20 connected to the tip of the operation rod 26 via the support shaft 21 moves from one end 19a of the elongated hole 19 to the other end. The inclination angle β of the flat plate 17 while approaching the direction of 19b
Becomes closer to the inclination angle α, and when the operating rod 26 is further pushed down, the inclination angle β of the flat plate 17 matches the inclination angle α and the valve element 16 contacts the valve seat 12, as shown in FIG. In this state, the valve element 16 comes into close contact with the valve seat 12 by the pushing down force of the operation rod 26 and the fluid pressure of the flow path 7 in the central portion, but the pin 29 is located downstream of the central axis 27 of the operation rod 26. Since it is located in the flow path, that is, on the right side of the central axis 27 in FIG. 3, by further pushing down the operation rod 26,
The valve element 16 and the valve seat 12 are closely contacted and retightened to completely shut off the fluid flow. In the flat plate stopper 1 of the present embodiment, the operating rod 26 is designed, for example, when the fluid pressure is 250 mmAq and the inner diameter of the flange portion of the upstream or downstream passage is 75 A.
It is about 1.1 kgf, which is relatively small.

The valve element 16 of this embodiment further operates as follows. That is, in the state where the valve element 16 is tightened and tightly attached to the valve seat 12 in FIG. 3, for some reason,
Even when the pressure of the downstream side flow passage 6 becomes higher than the pressure of the upstream side flow passage 5, the valve element 16 is tightly tightly attached to the valve seat 12 again, so that backflow is prevented. That is, it works the same as a conventional check valve. Furthermore, the valve 16
Rotates and approaches the valve seat 12 in an oblique state, and comes into close contact with the valve seat 12 after contact and closes the upstream side flow path 5 and the downstream side flow path 6,
It functions the same as the conventional gate valve 40 of FIG. Further, when the fluid is flowing from the downstream side flow path 6 to the upstream side flow path 5, by operating the operation rod 26, the valve element 16 functions to suppress the flow of the fluid, and the conventional ball shape is used. Works like a valve. Therefore, the flat plate plug 1 of this embodiment has the functions of the conventional globe valve, sluice valve and check valve, and also has the function of tightening the valve element.

Further, in the flat plate plug 1 of the present embodiment, the shape of the opening surface 13 of the valve seat 12 and the flat plate 17 of the valve is not particularly limited, but the cross-sectional shape of the sleeve 14 near the valve seat is cylindrical. If it is cut perpendicularly to the cylinder axis to make the opening surface 13 of the valve seat circular, and the shape of the valve plate 17 is also circular, it can be manufactured accurately and economically.

The flat plate stopper 1 of this embodiment is a valve that can be used both for shutting off in an emergency and for adjusting the flow rate in a normal state, has a good open / close operability, and has a fluid resistance when fully opened. In addition to being able to provide a valve that is small, has a large closing capability, and can be manufactured in various sizes economically, the operation of the flat plate stopper becomes even more reliable.

In this embodiment, since the shape of the lower inner wall 31 of the stopper body 30 is linear along the fluid flow direction 32, the fluid in the vicinity of the lower inner wall 31 of the stopper body 30 continuously flows through the fluid passage. Flowing in the direction 32, suspended 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 plate plug corresponding to FIG. In the flat plate plug of the embodiment shown in FIGS. 1 to 3, the upstream and downstream flow passages have a tapered shape, but the flat plate plug 1 of the present embodiment has the upstream and downstream flow passages 5. , 6 have the same shape. Also in such a flat plate stopper, for example, the valve element 16 is half-opened with respect to the valve seat 12 as shown in FIG. In the case, the central channel 7
The flow velocity of the flow path increases, and the same action as that of the embodiment shown in FIGS. 1 to 3 is exerted, and a pressure difference is generated between the upstream flow passage 5 and the central flow passage 7, and the upstream flow passage 5 The fluid flows from the to the flow path 7 in the central portion through the communication pipe 3, and the space 9 can be cleaned.

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

[0033]

Since the valve of the present invention connects the upstream side flow passage and the space portion with the communicating pipe, the pressure difference between the upstream side flow passage and the central portion flow passage causes Since a part of the fluid on the upstream side passes through the communication pipe and flows into the space, the fluid does not stay in the space, and therefore foreign matter and deterioration residue of the fluid do not stay, and the space of the valve is always kept. Can be washed.

Further, in the invention in which the upstream flow passage and the space portion are connected by a communication pipe that communicates with each other, the cross-sectional area of the upstream flow passage is formed larger than the cross-sectional area of the central flow passage. Therefore, the fluid in the upstream flow channel positively flows toward the space through the communication pipe, and the effect of the above invention is further ensured.

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

Further, in the above invention in which the upstream flow path is formed in a tapered shape, the downstream flow path is formed in a tapered shape symmetrical with the upstream flow path. Therefore, in addition to the effects of the invention described above, the valve has good durability and is easy to manufacture.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view showing a state where a valve element is half opened in the embodiment shown in FIG.

FIG. 3 is a cross-sectional view showing a state in which the valve element is in close contact with the valve seat to block the fluid passage in the embodiment of FIG.

FIG. 4 is a cross-sectional view showing another embodiment corresponding to FIG.

FIG. 5 is a cross-sectional view showing a sluice valve according to a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flat plate plug 3 Communication pipe 5 Flow path on the upstream side 6 Flow path on the downstream side 7 Flow path in the central part 9 Space part 12 Valve seat 16 Valve

Claims (4)

[Claims] 1. A valve seat located in a central flow passage provided between an upstream flow passage and a downstream flow passage, and a valve seat that is brought into contact with or separated from the valve seat to block the flow passage or the flow passage. Valve for adjusting the flow rate of
A valve provided with a space communicating with the flow passage in the central portion, wherein the flow passage on the upstream side and the space are connected by a communication pipe. 2. The valve according to claim 1, wherein a cross-sectional area of the flow passage on the upstream side is larger than a cross-sectional area of the flow passage in the central portion. 3. The shape of the flow passage on the upstream side according to claim 2, wherein the diameter is gradually increased from the inlet of the flow passage in the central portion toward the inlet of the flow passage on the upstream side. A valve characterized by being formed. 4. The valve according to claim 3, wherein the shape of the flow passage on the downstream side is formed in a tapered shape symmetrical with the shape of the flow passage on the upstream side.