JP4160010B2 - Fluid control valve - Google Patents

Description

  The present invention relates to a pressure loss reduction structure for a fluid control valve.

<Prior Art 1>
As a prior art of the fluid control valve, there is a fluid control valve 101 in Patent Document 1 as shown in FIG.
The configuration of the fluid control valve 101 will be described.
The fluid control valve 101 includes a pilot mechanism and a valve mechanism, and the valve mechanism includes a valve body 111 and a valve body 112. The valve body 111 is formed with an inlet port 141, a valve hole 142, an outlet port communication portion 143, an outlet port 144, a valve seat 145, and a flow path surface 147. Since the valve hole 142 is located at a height within the inner diameter of the inlet port 141, it is necessary to guide a part of the fluid supplied from the inlet port 141 to the valve hole 142, and the flow path wall 146 is provided. Yes.

Next, the operation of the fluid control valve 101 will be described.
Although there is no specific description in Patent Document 1, when fluid is supplied from the inlet port 141 when the valve body 112 and the valve seat 145 are separated by the action of the pilot mechanism and the fluid control valve 101 is in the open state, Is considered to flow to the outlet port 144 via the valve hole 142 and the outlet port communication portion 143 directly upon hitting the flow path wall 146.
No. 6-36374 ([Example] etc., FIG. 1)

<Conventional technology 2>
In addition, generally, a fluid control valve 201 as shown in FIG.
The configuration of the fluid control valve 201 will be described.
The fluid control valve 201 includes a pilot mechanism and a valve mechanism, and the valve mechanism includes a valve body 211 and a valve body 212. The valve body 211 includes an input port 241, a valve hole 242, an output port communication portion 243, an output port 244, a valve seat 245, and a flow path surface 247.

  Moreover, in the AA cross section of FIG. 8, the valve main body 211 has a shape as shown in FIG. As shown in FIG. 9, the output port communication portion 243 has a valve hole 242 formed by a first portion 243a and a second portion 243b formed in a circular shape concentric with the outer periphery of the valve hole 242 formed in a circular shape. On the other hand, it is configured via a valve seat 245.

The operation of the fluid control valve 201 will be described.
Similar to Patent Document 1 described above, when the valve body 212 and the valve seat 245 are separated by the action of the pilot mechanism and the fluid control valve 201 is in the open state, the fluid supplied from the input port 241 is supplied to the valve hole 242. And flows to the output port 244 via the output port communication unit 243.

However, the conventional techniques 1 and 2 have the following problems.
In the fluid control valve 101 of Patent Document 1 as the prior art 1, a part of the fluid supplied from the inlet port 141 stagnates in the vicinity of the flow path wall 146, so that the flow velocity becomes small.
In addition, as shown in FIG. 7, the flow path surface 147 is formed in a circumferential shape. However, since the radius forming the circumference is small, fluid stagnation easily occurs in this portion, and the flow velocity is reduced.
Therefore, a portion with a large flow velocity and a portion with a small flow velocity are mixed in the flow path, the flow is concentrated on a portion with a large flow velocity, and the flow efficiency is deteriorated in a portion with a small flow velocity, resulting in a poor balance of the flow velocity in the entire flow path.

  Also in the fluid control valve 201 of the prior art 2, the portion of the flow path surface 247 is formed in a circumferential shape as shown in FIG. 8, but since the radius forming the circumference is small, as shown in FIG. In this part, fluid stagnation is likely to occur, and the flow velocity is reduced. Therefore, a portion with a large flow velocity and a portion with a small flow velocity are mixed in the flow path, the flow is concentrated on a portion with a large flow velocity, and the flow efficiency is deteriorated in a portion with a small flow velocity, resulting in a poor balance of the flow velocity in the entire flow path.

If fluid is supplied from the input port 241 to the output port communication portion 243 via the valve hole 242, the fluid flowing out from the valve hole 242 is output in the output port communication portion 243 as shown in FIG. As the value approaches, the flow rate gradually increases, and instead of flowing uniformly from the valve hole 242 to the entire output port communication portion 243, the flow rate tends to flow directly to the output port 244. Here, in FIG. 11, the thickness of the arrow represents the magnitude of the flow rate.
This flow is considered to be due to the fact that the outer periphery of the cross section of the valve hole 242 and the annular cross section of the first portion 243a of the output port communication portion 243 are formed concentrically.

That is, as shown in FIG. 11, particularly, the first portion 243a of the output port communication portion 243 is blocked by the flow path wall 248, and its cross-sectional area is small, so that the fluid tends to stay. On the other hand, since the opening part of the part which goes to the output port 244 directly from the valve hole 242 is wide, the flow velocity becomes large and it becomes easy to flow.
Due to the nature of the fluid, if there is a part where the flow velocity is large and easily flows, it tends to concentrate on the part and flow easily. Therefore, a part of the fluid distributed to the entire outer periphery of the valve hole 242 and supplied into the output port communication part 243 Cannot flow into the output port 244. Therefore, the balance of the supply efficiency of the whole fluid supplied from the valve hole 242 to the output port communication portion 243 is deteriorated, and as a result, the flow rate of the fluid supplied from the valve hole 242 is reduced and the fluid pressure is lowered.

As a result, the flow rate from the valve holes 142 and 242 decreases as a result, and the fluid pressure at the outlet port 144 and the output port 244 decreases. Therefore, for example, when these fluid control valves are used to control the cutting fluid of a machine tool, when a discharge nozzle (not shown) of the machine tool is reached, a flow rate necessary for removing chips is secured. I couldn't.
Therefore, in order to secure the necessary flow rate, it is necessary to increase the output of the pump (not shown) or increase the pipe diameter. It was the cause that caused the situation contrary to.

  Therefore, in order to solve the above-described problems, the present invention realizes a fluid control valve structure that reduces the decrease in fluid pressure, thereby reducing the size of the pump and the pipe diameter, etc., and reducing the required flow rate with a small amount of energy. An object of the present invention is to provide a fluid control valve that can be secured and contributes to energy saving measures and space saving of a production line.

In the invention according to claim 1 in order to achieve the above object, an input port, and the valve hole of a substantially hollow cylindrical shape formed perpendicular to the flow direction of the input port communicating with said input port, said valve hole it and an output port communicating portion of a substantially hollow cylindrical shape having therein a fluid control valve having a valve body and the output port are formed, the center of the valve hole is located on the center axis of the output port, said generally hollow the central axis of the output port communicating portion of the cylindrical shape is eccentric with the center axis to the input port side to the central axis of the valve hole of the substantially hollow cylindrical shape, and wherein.

In the invention according to claim 2 in order to achieve the above object, according to the fluid control valve of claim 1, wherein the convex portion on the outer periphery of the valve seat surrounding the valve hole is formed, and said output port communicating outer periphery on A convex portion is formed on the surface.

  The fluid control valve of the present invention has a valve body that is provided with a valve hole that communicates with the input port and is formed perpendicular to the flow direction of the input port, and that has a flow path that communicates the input port with the valve hole. Since the fluid control valve has a flow path formed with a substantially uniform cross section from the input port to the valve hole, the flow velocity balance in the entire flow path is improved, and the flow efficiency is improved. Pressure drop is reduced.

  The fluid control valve according to the present invention further includes a valve centered on the input port side end portion of the input port side end surface of the valve hole in the cross section of the flow path in the plane having the central axis of the input port and the central axis of the valve hole. A circular outer periphery with the radius of the inner diameter of the flow path at the end face on the input port side of the hole is formed, so that the flow velocity balance of the entire flow path is more reliably ensured and the flow efficiency is improved. Pressure drop is reduced.

  The fluid control valve of the present invention includes an input port, a substantially hollow cylindrical valve hole that communicates with the input port and is formed perpendicular to the flow direction of the input port, and a substantially hollow cylindrical output that has the valve hole therein. In a fluid control valve having a valve body in which a port communication part and an output port are formed, the central axis of the substantially hollow cylindrical output port communication part is on the input port side with respect to the central axis of the substantially hollow cylindrical valve hole The flow velocity is almost uniform over the cross section of the output port communication section, and the fluid flowing out from the valve hole flows almost evenly over the cross section of the output port communication section, improving the flow efficiency. The fluid supplied from the valve hole flows to the output port without stagnation and a high Cv value is obtained, and a decrease in fluid pressure due to the fluid control valve is reduced.

  In the fluid control valve of the present invention, since the convex portion is formed on the outer periphery of the valve seat surrounding the valve hole and the convex portion is formed on the outer periphery of the output port communication portion, the fluid is divided into two without colliding with each other. The fluid flows in a balanced manner throughout the output port communication section, and the bisected fluid is sent to the output port without colliding with each other, so that the flow velocity is less changed and the fluid flow efficiency is improved. The fluid flows to the output port without stagnation and a high Cv value is obtained, and a decrease in fluid pressure due to the fluid control valve is reduced.

  Examples of the present invention will be described below.

As a first embodiment of the present invention, a fluid control valve 1 as shown in FIG. 1 will be described.
First, the configuration of the fluid control valve 1 will be described.
The fluid control valve 1 includes a pilot mechanism and a valve mechanism, and the valve mechanism includes a valve body 11 and a valve body 12. The valve body 11 includes an input port 41, a valve hole 42, an output port communication portion 43, an output port 44, and a valve seat 45. A flow path surface 47 formed with a radius R is formed in the flow path on the input port 41 side. Since the valve hole 42 is positioned at the height of the flow path surface of the input port 41, there is no such thing as the flow path wall 146 in the fluid control valve 101 of the prior art 1.

Next, the operation of the fluid control valve 1 having the above configuration will be described.
When the valve body 12 and the valve seat 45 are separated by the action of the pilot mechanism and the fluid control valve 1 is in the open state, when the fluid is supplied from the input port 41, the fluid passes through the valve hole 42 and the output port communication portion 43. Then, it is discharged from the output port 44.
Here, the flow path between the input port 41 and the valve hole 42 is formed so that the cross-sectional area is substantially uniform, and there is no flow path wall 146 in the fluid control valve 101 of the prior art 1. The fluid flows smoothly, and the flow velocity is balanced in the entire flow path, so that the flow efficiency is improved.
Further, unlike the circumferential radius of the flow path surface 147 in the fluid control valve 101 of the prior art 1 and the flow path surface 247 of the fluid control valve 201 of the prior art 2, the flow path surface 47 is formed with a large radius R as shown in FIG. As a result, the fluid can flow more smoothly and the flow velocity in the entire flow path can be balanced to improve the flow efficiency.

With the fluid control valve 1 of the present invention having the above-described configuration and operation, the following effects can be obtained.
The fluid control valve 1 of the present invention is provided with a valve hole 42 that communicates with the input port 41 and is formed perpendicular to the flow direction of the input port 41, and a flow path that communicates the input port 41 with the valve hole 42. Since the fluid control valve having the valve body 11 has a flow path formed by a substantially uniform cross section from the input port 41 to the valve hole 42, the flow velocity in the entire flow path is balanced and the flow efficiency is improved. The fluid pressure drop caused by the fluid control valve is reduced.
Therefore, when this fluid is, for example, a cutting fluid for a machine tool, it is necessary to eliminate chips even when reaching the discharge nozzle of the machine tool, without intentionally increasing the size of the pump or pipe diameter. The flow rate can be secured, which can contribute to energy saving measures and space saving on the production line.

The fluid control valve 1 of the present invention further includes a cross section of the flow path in a plane having the central axis of the input port 41 and the central axis of the valve hole 42, and the input port 41 side end face of the input hole 41 side of the valve hole 42 Since the circular outer periphery with the radius R as the inner diameter of the flow path at the end surface on the input port 41 side of the valve hole 42 is formed centering on the end, the flow velocity balance of the entire flow path can be more reliably obtained and the flow efficiency The fluid pressure drop caused by the fluid control valve is reduced.
Therefore, when this fluid is, for example, a cutting fluid for a machine tool, it is necessary to eliminate chips even when reaching the discharge nozzle of the machine tool, without intentionally increasing the size of the pump or pipe diameter. The flow rate can be secured, which can contribute to energy saving measures and space saving on the production line.

As a second embodiment of the present invention, a fluid control valve 2 constituting a valve body 21 as shown in FIGS. 2 and 3 will be described. 2 and 3 correspond to the AA cross-sectional view in FIG.
First, the configuration of the valve body 21 will be described.
As shown in FIG. 2, the valve body 21 includes an input port 41, a valve hole 42, an output port communication portion 43, an output port 44, and a valve seat 45. The output port communication portion 43 includes a first portion 43a and a second portion 43b. As shown in FIG. 3, the outer periphery of the first portion 43a is formed in a circular shape centered on a point O1 that is eccentric from the center point O0 of the valve hole 42 to the input port 41 side.

Next, the operation of the valve body 21 having the above configuration will be described.
The fluid supplied from the input port 41 flows out from the valve hole 42 through the valve seat 45 to the output port communication portion 43 and is discharged from the output port 44.
Here, as shown in FIGS. 2 and 3, the outer periphery of the first portion 43a is formed in a circular shape centered on a point O1 eccentric from the center point O0 of the valve hole 42 to the input port 41 side. The area of the opening (second portion 43b) from the output port communication portion 43 to the output port 44 is reduced, and the area of the first portion 43a is substantially the same size as the second portion 43b. For this reason, when fluid is supplied from the input port 41 to the output port communication portion 43 via the valve hole 42, the flow velocities are substantially uniform over the first portion 43a and the second portion 43b. Accordingly, the cutting fluid flowing out from the valve hole 42 flows substantially evenly over the first portion 43a and the second portion 43b of the output port communication portion as shown in FIG. Here, in FIG. 4, the thickness of the arrow indicates the magnitude of the flow rate. Note that the center of the outer periphery of the first portion 43a and the center of the valve hole 42 have an eccentricity of about 10% with respect to the diameter of the outer periphery of the first portion 43a in order to obtain the above effect from the results of the experiment. It turns out to be desirable.

With the fluid control valve 2 of the present invention having the above-described configuration and operation, the following effects can be obtained.
The fluid control valve 2 of the present invention has an input port 41, a substantially hollow cylindrical valve hole 42 communicating with the input port 41 and formed perpendicular to the flow direction of the input port 41, and the valve hole 42 therein. In the fluid control valve having the valve body 11 in which the output port communication portion 43 having a substantially hollow cylindrical shape and the output port 44 are formed, the central axis of the output port communication portion 43 having a substantially hollow cylindrical shape has a substantially hollow cylindrical shape. Since the center of the hole 42 is eccentric to the input port 41 side, the area of the opening (second portion 43b) from the output port communicating portion 43 to the output port 44 is reduced, while the output port communicating The area of the first portion 43a of the portion 43 is widened, the flow velocity is substantially uniform over the cross section of the output port communication portion 43, and the fluid flowing out from the valve hole 42 flows almost uniformly over the cross section of the output port communication portion 43. flow Efficiency is improved, the fluid supplied from the valve hole 42 is obtained a higher Cv value flowing to the output port 44 without staying, reduction of the fluid pressure by the fluid control valve is reduced.
Therefore, when this fluid is, for example, a cutting fluid for a machine tool, it is necessary to eliminate chips even when reaching the discharge nozzle of the machine tool, without intentionally increasing the size of the pump or pipe diameter. The flow rate can be secured, which can contribute to energy saving measures and space saving on the production line.

As a third embodiment of the present invention, a fluid control valve 3 constituting a valve body 31 as shown in FIG. 5 will be described. FIG. 5 corresponds to the AA cross-sectional view in FIG.
First, the configuration of the valve body 31 will be described.
Similar to the valve body 21 of the second embodiment, the valve body 31 is formed in a circular shape centered on a point O1 where the outer periphery of the first portion 43a is eccentric from the center point O0 of the valve hole 42 to the input port 41 side. The other configurations are the same. However, as shown in FIG. 5, a convex portion 51 is formed on the outer periphery of the first portion 43 a, and a convex portion 52 is formed on the outer periphery of the valve seat 45.

Next, the operation of the valve body 31 having the above configuration will be described.
The fluid supplied from the input port 41 flows out from the valve hole 42 through the valve seat 45 to the output port communication portion 43 and is discharged from the output port 44.
If the fluid is supplied from the valve hole 42 in FIG. 5, the fluid does not collide with both sides by the convex portion 51 as shown in FIG. 6, and is evenly distributed in the output port communication portion 43. The flow is guided to the output port 44 by the section 52 without colliding with the flow and discharged.

The following effects can be obtained by the fluid control valve of the present invention having the above configuration and operation.
In the fluid control valve 3 of the present invention, in the fluid control valve 2 according to the second embodiment, the convex portion 52 is formed on the outer periphery of the valve seat 45 surrounding the valve hole 42, and the convex portion 51 is formed on the outer periphery of the output port communication portion 43. Therefore, the fluid is divided into two without colliding, and the fluid flows in a balanced manner throughout the output port communication portion 43, and the divided fluid is sent to the output port 44 without colliding with each other. The fluid flow efficiency is improved, the fluid supplied from the valve hole 42 flows to the output port 44 without stagnation and a high Cv value is obtained, and the decrease in fluid pressure due to the fluid control valve is reduced. The
Therefore, when this fluid is, for example, a cutting fluid for a machine tool, it is necessary to eliminate chips even when reaching the discharge nozzle of the machine tool, without intentionally increasing the size of the pump or pipe diameter. The flow rate can be secured, which can contribute to energy saving measures and space saving on the production line.

  The fluid control valve of the present invention is not limited to the above-described embodiment, and can be applied to a hydraulic control valve, a pneumatic control valve, or the like without departing from the spirit of the fluid control valve.

Sectional drawing of the fluid control valve of Example 1 of this invention is shown. Sectional drawing of the valve main body of Example 2 of this invention is shown. It is sectional drawing which shows the eccentric state in the outer periphery of the output port communication part of the valve main body of Example 2 of this invention. It is sectional drawing which shows the mode of the flow of the fluid in the valve main body of Example 2 of this invention. Sectional drawing of the valve main body of Example 3 of this invention is shown. It is sectional drawing which shows the mode of the flow of the fluid in the valve main body of Example 3 of this invention. Sectional drawing of the fluid control valve of patent document 1 is shown. Sectional drawing of the conventional fluid control valve is shown. Sectional drawing (AA sectional drawing of FIG. 8) of the valve main body of the conventional fluid control valve is shown. It is sectional drawing which shows the problem of the stagnation of the fluid in the conventional fluid control valve. It is sectional drawing which shows the mode of the flow of the fluid in the valve main body of the conventional fluid control valve.

Explanation of symbols

1 Fluid control valve 11 Valve body (Example 1)
21 Valve body (Example 2)
31 Valve body (Example 3)
41 Input port 42 Valve hole 43 Output port communication part 44 Output port 47 Flow path

Claims (2)

An input port, a substantially hollow cylindrical valve hole formed in communication with the input port and perpendicular to the flow direction of the input port, and a substantially hollow cylindrical output port communication portion having the valve hole therein, In a fluid control valve having a valve body formed with an output port,
The center of the valve hole is on the center axis of the output port;
The central axis of the substantially hollow cylindrical output port communication portion is eccentric on the central axis on the input port side with respect to the central axis of the substantially hollow cylindrical valve hole ,
A fluid control valve characterized by.   The fluid control valve of claim 1.
  A fluid control valve, wherein a convex portion is formed on an outer periphery of a valve seat surrounding the valve hole, and a convex portion is formed on an outer periphery of the output port communication portion.

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