JP5069584B2 - On-off valve - Google Patents

Description

  The present invention relates to an on-off valve that receives the pressure of a fluid with a diaphragm and opens and closes an outlet with the diaphragm.

  As a conventional on-off valve of this type, an outlet is provided so as to be located in the center, and an annular flow path surrounding the outlet is formed. Further, a diaphragm type on-off valve for opening and closing the outlet is provided. Is provided. A communication path is provided to connect the back pressure chamber of the diaphragm and the flow path, and the pressure of the fluid in the flow path acts on the back pressure chamber, and the pressure in the back pressure chamber becomes the back pressure and the diaphragm is The outlet is pressed against the outlet and the outlet is closed. On the other hand, a through hole is provided in the center of the diaphragm, and the back pressure chamber communicates with the outflow port through this through hole. It is closed by a plunger that moves forward and backward with force. When the valve is opened, the plunger is retracted, and the pressure in the back pressure chamber is lowered by communicating the back pressure chamber with the outflow port through the through hole. Then, the diaphragm is moved in a direction away from the outlet by the pressure in the flow path. This movement opens the outlet, and the fluid in the flow channel flows out to the outlet.

  However, the inflow passage for allowing the fluid to flow into the flow path is open on the side surface of the flow path, and the fluid that has flowed into the flow path from the inflow path diverts into the left and right directions by bypassing the outflow port. On the other hand, both flows collide with each other in the opposite position across the outlet, pushing the diaphragm stronger than the other positions. For this reason, there is a problem that the diaphragm is tilted and opened.

In order to solve such a problem, there has been known one provided with a plurality of ribs that obstruct the flow of fluid flowing into the flow path from the inflow passage (see, for example, Patent Document 1). When the ribs are provided in this manner, the flow of fluid collides with the ribs and the flow direction changes to the direction of pushing the diaphragm. Therefore, the diaphragms are pushed at a plurality of locations where the ribs are provided, and the inclination of the diaphragm is prevented.
Japanese Patent Publication No. 58-33948 (FIGS. 2 and 3)

  In the case where the conventional rib is provided, the rib hinders the flow of the fluid and becomes a flow resistance. Therefore, in particular, when the flow rate is small, the flow rate from the outlet is reduced due to the flow resistance of the ribs.

  In view of the above problems, an object of the present invention is to provide an on-off valve that can prevent the diaphragm from tilting without increasing the flow resistance.

In order to solve the above problems, an on-off valve according to the present invention is provided with a diaphragm-type on-off valve that forms an outlet located in the center and an annular flow path surrounding the outlet, and opens and closes the outlet. Furthermore, the pressure in the flow path is guided to the back pressure chamber of the on / off valve, and the on / off valve is pressed against the outlet by the back pressure in the back pressure chamber to close the valve and the back pressure in the back pressure chamber is released to the outlet side. in to the flow path opening and closing valve with an opening and closing valve mechanism is moved away off valve from the outlet by the pressure for opening the side surfaces of the flow path of the inlet passage for flowing fluid in the flow path met In the flow direction of the fluid that flows into the flow path from this inflow passage and collides with the side wall of the outflow port and is diverted in the left-right direction and flows around the outflow port. Along the counterclockwise detour distance from the opening position of the inflow passage and right In addition to providing a raised portion raised from the bottom surface of the flow path at a position different from the detour distance, the inclination angle of the surface of the raised portion where the fluid flowing from the longer detour distance collides is set. The slant angle of the surface where the fluid flowing from the shorter detour distance collides is more characteristic.

  The flow with the longer detour distance is gradually dispersed by the surface with a gentle slope until reaching the ridge, and becomes a flow toward the diaphragm. On the other hand, the flow with the shorter detour distance is relatively concentrated on the surface with a steep slope and flows toward the diaphragm, and the flow toward the diaphragm generated on both slopes balances each other and pushes the diaphragm.

  If the surface with the gentler slope is positioned on the opposite side of the opening of the inflow passage with the outlet in between, the flow at the position where the flow of pushing the diaphragm was concentrated in the conventional on-off valve Can be dispersed.

  As is clear from the above description, the present invention does not tilt when the diaphragm opens because the flow of pushing the diaphragm is dispersed. In addition, since only one raised portion is provided, the flow resistance can be reduced as compared with the conventional one having a plurality of ribs.

  With reference to FIG. 1, 1 is an example of the on-off valve according to the present invention. The on-off valve 1 has a solenoid part 2 at the upper part of a main body 11. The solenoid unit 2 includes a plunger 21 that can move up and down by electromagnetic force.

  The main body 11 is provided with an outlet 4 that opens upward in the center portion, and an annular channel 5 that surrounds the outlet 4 is formed. The fluid in the flow path 5 flows out from the outlet 4 to the downstream side, and the outlet 4 is configured to be opened and closed by the diaphragm 3. The diaphragm 3 is provided with a pilot hole 31, and the fluid pressure in the flow path 5 acts on the back pressure chamber 32 through the pilot hole 31. Then, the pressure in the back pressure chamber 32 becomes back pressure, and the diaphragm 3 is pressed against the outflow port 4 so as to be closed. For this reason, the fluid in the flow path 5 cannot flow out through the outlet 4.

  A through hole 33 is provided at the center of the diaphragm 3, and when the diaphragm 3 is in a closed state, the through hole 33 is closed by the plunger 21. When the valve is opened, the solenoid unit 2 is energized to retract the plunger 21 upward. Then, as shown in FIG. 2, the back pressure chamber 32 communicates with the outflow port 4 through the through hole 33. Since the pressure in the back pressure chamber 32 is released to the outlet 4 through the through hole 33, the back pressure that presses the diaphragm 3 against the outlet 4 disappears, and the pressure in the flow path 5 causes the diaphragm 3 to In the drawing, it is pushed upward, that is, away from the outlet 4. As a result, the flow path 5 communicates with the outlet 4, and the fluid in the flow path 5 flows out from the outlet 4 to the downstream.

  When closing the valve from this open state, the plunger 21 is advanced downward to close the through hole 33. Then, the fluid in the flow path 5 flows into the back pressure chamber 32 through the pilot hole 31 and returns to the state shown in FIG. Reference numeral 6 denotes an inflow passage, and the inflow passage 6 opens on the side surface of the flow path 5. 61 is the opening.

  In the present invention, the raised portion 7 is provided at one place in the flow path 5 from the bottom surface 51 of the flow path 5. As shown in FIG. 3, in the present embodiment, the position of the opening 61 is set to 0 °, and the opening 61 is provided in a range from 180 ° to 270 ° clockwise. Therefore, the raised portion 7 is formed not at a position (180 °) opposite to the opening 61 across the outlet 4 but at a position shifted by 45 ° from the position. And the slope 71 which connects the bottom face 51 and the upper surface of the protruding part 7 was provided in the range of 90 degrees to 180 degrees. A vertical side surface 72 connecting the bottom surface 51 and the top surface of the raised portion 7 was provided at a position of 270 °. In the present embodiment, the side surface 72 is formed vertically, but may be a slope as long as the angle is steeper than the slope angle of the slope 71.

  When the diaphragm 3 is closed, the fluid flowing into the flow path 5 from the inflow passage 6 through the opening 61 bypasses the outflow port 4 and is divided into two directions. In FIG. 3A, the detour flow FL divided in the clockwise direction continuously changes the flow direction upward while flowing along the inclined surface 71 and pushes up the diaphragm 3. On the other hand, the detour flow FR divided in the counterclockwise direction changes the flow direction upward in a relatively narrow range by the side surface 72 and pushes up the diaphragm 3. As described above, the flow in the direction of pushing up the diaphragm 3 over a wide range is generated by both the bypass flows FL and FR, and when the solenoid portion 2 is energized and the through hole 33 is opened by the plunger 21, the diaphragm 3 is tilted. Without pushing up, the outlet 4 is opened.

By the way , the raised portion 7 may be provided only at a portion of 270 ° (without providing a flat portion), and the range from 90 ° to 270 ° may be used as the slope 71.

  In addition, this invention is not limited to an above-described form, You may add a various change in the range which does not deviate from the summary of this invention.

The figure which shows the structure of one embodiment of this invention Sectional view showing the valve open state Diagram showing the shape of the ridge

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 On-off valve 2 Solenoid part 3 Diaphragm 4 Outflow port 5 Flow path 6 Inflow passage 7 Raised part 11 Main body 21 Plunger 32 Back pressure chamber

Claims (2)

An outlet located in the center and an annular channel surrounding the outlet are formed, and a diaphragm type on-off valve for opening and closing the outlet is provided, and the pressure in the channel is controlled by a back pressure chamber of the on-off valve. The open / close valve is pressed against the outlet by the back pressure in the back pressure chamber and closed, and the back pressure in the back pressure chamber is opened to the outlet and the on / off valve is released from the outlet by the pressure in the flow path. In an on-off valve provided with an on-off valve mechanism that opens in a direction away from the opening, an inflow passage for allowing fluid to flow into the flow path is provided on the side surface of the flow path so as to open toward the center of the outlet. In addition, a counterclockwise detour distance from the opening position of the inflow passage along the flow direction of the fluid that flows into the flow path from this inflow passage and collides with the side wall of the outflow passage and is diverted in the left-right direction and flows around the outflow passage. And the clockwise detour distance is different from the bottom of the flow path. In addition to providing a raised ridge, the angle of inclination of the side of the ridge that the fluid flowing from the longer detour distance collides is determined by the inclination angle of the surface that the fluid flowing from the shorter detour distance collides. An on-off valve characterized by being made gentler than the inclination angle.   2. The on-off valve according to claim 1, wherein the surface with the gentler slope is positioned on the opposite side of the opening portion of the inflow passage with the outflow port interposed therebetween.

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