JP2018178988A - Annular valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an annular valve having a long life while suppressing the occurrence of pressure loss of gas around the sealing surface by optimizing the shape of the sealing surface of the valve body. SOLUTION: A flat plate-shaped valve seat 10, a passing flow path 11 having an arc-shaped opening cross section and arranged on a concentric circle centered on a central axis of the valve seat 10, and a passing flow path 11 on the same circle. A flat plate-shaped receiving plate 20 having an annular groove 13 connecting between the two, and a discharge flow path 21 and being arranged to face the valve seat 10 via an intermediate chamber 50, and an arc shape of the opening cross section of the passage flow path 11. The valve body 30 is formed in a ring shape corresponding to the above, is arranged in the intermediate chamber 50, and is supported by the receiving plate 20 and the valve body 30 that opens and closes the passing flow path 11 by being brought into contact with and separated from the valve seat 10. A spring member 40 elastically urged toward the valve seat 10 is provided, and the sealing surface of the valve body 30 facing the passing flow path 11 has a torus shape and is directed from the passing flow path 11 toward the valve body 30. It has a shape that eliminates the pressure loss element for the inflowing gas, and there is no step between the receiving plate 20 and the valve body 30. [Selection diagram] Fig. 1

Description

  The present invention relates to an annular valve used in a compressor or the like, and in detail, by optimizing the seal surface shape of the valve body, the occurrence of pressure loss of gas around the seal surface is suppressed and the life span is extended. On the valve.

  Conventionally, in a compressor or the like, an annular valve is used. As shown in FIG. 7, this annular valve has a flat valve seat 110 having a plurality of passage channels 111 whose opening cross section has a circular arc shape, a discharge channel 121, and an intermediate chamber 150 in the valve seat 110. It comprises and comprises the flat-shaped receiving board 120 arrange | positioned facing each other, and the valve plate 130 arrange | positioned in the intermediate chamber 150 (patent document 1). The valve plate 130 is supported by a valve receiver (support plate) 132 on the side facing the receiving plate 120. A valve body is configured by the valve plate 130 and the valve receiver (support plate) 132. In this valve body, only the valve plate 130 is replaceable except for the valve receiver (support plate) 132.

  The valve plate 130 has a plurality of sealing surfaces 131 formed in an arc shape corresponding to an arc shape which is an opening cross section of the passage channel 111. The seal surface 131 is formed as a plurality of arc-shaped protrusions. The valve plate 130 brings the seal faces 131 into contact with and separates from the opening end faces of the passage channels 111 by opening and closing the valve passages 110, thereby opening and closing the passage channels 111.

  The valve plate 130 is elastically biased toward the valve seat 110 by the spring member 140 via the valve receiver (support plate) 132. The spring member 140 is a compression coil spring and is disposed between the receiving plate 120 and the valve receiver (support plate) 132. In the natural state of the annular valve, the valve plate 130 presses each seal surface 131 against the opening end face of each passage 111 by the biasing force of the spring member 140, thereby closing the passage 111.

Patent No. 2591824 gazette

  In the annular valve described above, when the pressure of the gas in the passage 111 increases and exceeds the biasing force of the spring member 140, each sealing surface 131 is pressed by the pressure of the gas, and the valve plate 130 It is separated from the valve seat 110 against the force. At this time, the gas in the passage channel 111 flows from the opening end surface of the passage channel 111 to the periphery of the seal surface 131 and flows toward the discharge channel 121 of the receiving plate 120. The gas flowing toward the discharge flow passage 121 passes through the discharge flow passage 121 and is discharged to the outside of the annular valve.

Thus, with respect to the gas flowing from the passage passage 111 to the discharge passage 121, pressure loss occurs due to the passage resistance in the annular valve. Further, since the seal surface 131 is formed as a plurality of arc-shaped protrusions, a pressure loss occurs at a portion connecting the seal surfaces 131 (a portion between the seal surfaces 131). In addition, since the seal surface 131 itself has a pressure loss element (such as an angular ridge portion) with respect to gas, pressure loss occurs in the gas around the seal surface 131. The sealing surface 131 has a square ridge portion to bring the sealing surface 131 and the valve seat 110 into surface contact. Furthermore, the boundary between the valve plate 130 and the valve receiver (support plate) 132 is a step, and a pressure loss occurs at this step, and separation of the air flow occurs behind the valve plate 130, causing a pressure loss. Occur.

  Such pressure loss is an energy loss in the annular valve, and causes a significant increase in the load on a power source (such as a pump) that raises the pressure of the gas. From the viewpoint of energy saving in recent years, it is strongly demanded to reduce energy loss in such an annular valve. Moreover, such pressure loss destabilizes the movement of the valve body, accelerates the wear of the valve plate 130, the spring member 140 and the receiving plate 120, and shortens the life of the annular valve.

  However, in the conventional annular valve, the occurrence of pressure loss of gas around the sealing surface of the valve plate is not sufficiently suppressed, and energy loss can not be reduced.

  Then, this invention makes it a subject to provide an annular valve with a long life as well as suppressing pressure loss of gas around the seal surface by optimizing the seal surface shape of the valve body.

  Other objects of the present invention will become apparent from the following description.

  The problems are solved by the following inventions.

1.
A flat valve seat,
An open cross-section having an arc shape, and a passage flow passage arranged concentrically with the central axis of the valve seat as a center;
An annular groove connecting the passage channels on the same circle;
A flat plate-like receiving plate having a discharge flow path and disposed opposite to the valve seat via an intermediate chamber;
A valve body which is formed in an annular shape corresponding to the arc shape of the opening cross section of the passage, is disposed in the intermediate chamber, and opens and closes the passage by coming in and out of contact with the valve seat;
A spring member supported by the receiving plate and resiliently urging the valve body toward the valve seat;
The sealing surface of the valve body opposed to the passage flow path has a torus shape and a shape in which a pressure loss element for the gas flowing from the passage flow path toward the valve body is eliminated.
There is no level | step difference between the said receiving plate and the said valve body, The annular valve characterized by the above-mentioned.
2.
The annular valve according to claim 1, wherein the sealing surface of the valve body opposed to the passage has the same longitudinal sectional shape on the outer peripheral side and the inner peripheral side of the valve body.
3.
The surface of the valve seat that faces the sealing surface has a convex torus shape that is smooth with respect to the periphery, and a shape that eliminates pressure loss elements for the gas that has flowed from the passage toward the valve body. The annular valve according to claim 1 or 2, characterized in that:

  According to the present invention, by optimizing the seal surface shape of the valve body, it is possible to suppress the occurrence of pressure loss of gas around the seal surface and provide an annular valve with a long life.

An exploded perspective view showing the configuration of the annular valve of the present invention A perspective view showing the outflow side of the valve seat Sectional drawing which shows the use condition of the annular valve of FIG. An enlarged sectional view showing the main part of the ring valve of FIG. 1 1 is a cross sectional view showing the flow of gas around the sealing surface of the annular valve of FIG. 1 and a conventional annular valve Graph showing the coefficient of resistance around the sealing surface of the annular valve of FIG. 1 and the conventional annular valve Cross-sectional view showing the configuration of a conventional annular valve

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an exploded perspective view showing the configuration of the annular valve of the present invention.

  As shown in FIG. 1, the annular valve 1 includes a valve seat 10, a receiving plate 20, and a valve body 30 disposed between the valve seat 10 and the receiving plate 20.

  The valve seat 10 is formed of a metal material or the like in a flat plate shape (disk shape) whose outer edge is circular, and has a plurality of passage channels 11. Each passage 11 is referred to as a back side (downward in FIG. 1) (hereinafter, “outflow side”) from the front side (upper side in FIG. 1) (hereinafter referred to as “inflow side”) of the valve seat 10. Through holes). Each of the passage channels 11 has an opening cross section in an arc shape, and is arranged concentrically with the central axis of the valve seat 10 as a center.

  FIG. 2 is a perspective view showing the outflow side of the valve seat.

  On the outflow side of the valve seat 10, as shown in FIG. 2, an annular groove 13 connecting between the passage channels 11 on the same circle is formed, and as a whole, centered on the central axis of the valve seat 10. Annular grooves 13 having different diameters are formed concentrically. When viewed from the outflow side, each passage 11 is open at the bottom of the annular groove 13. Therefore, the edge facing the outflow side of the annular groove 13 is the open end of each passage 11.

  As shown in FIG. 1, the annular valve 1 has a receiving plate 20 formed of a metal material or the like into a flat plate (disk shape) whose outer edge is circular. The outer diameter of the receiving plate 20 is approximately equal to the outer diameter of the valve seat 10. In the receiving plate 20, a plurality of discharge flow paths 21 are formed. Each discharge passage 21 is referred to as a back side (downward in FIG. 1) (hereinafter, “outflow side”) from the surface side (upper side in FIG. 1) (hereinafter referred to as “inflow side”) of the receiving plate 20. Through holes). Each discharge passage 21 has an opening cross section in an arc shape, and is arranged on a concentric circle centered on the central axis of the receiving plate 20.

  In addition, although the discharge flow path 21 is made into circular-arc-shaped opening cross section in this embodiment, it is not restricted to this, as long as attachment and support of the spring member 40 mentioned later are possible, it may be any shape. .

  FIG. 3 is a cross-sectional view showing a use state of the annular valve 1 of FIG.

  As shown in FIG. 3, the annular valve 1 is used in a state of being fitted to the inside of a cylindrical member 100 serving as a flow path for gas (which may contain liquid vapor). The valve seat 10 has an outer peripheral surface Is placed in close contact with the inner peripheral surface of the cylindrical member 100 and installed inside the cylindrical member 100. The receiving plate 20 is disposed opposite to the valve seat 10 at a predetermined distance. A space surrounded by the valve seat 10 and the receiving plate 20 and surrounded by the inner peripheral surface of the cylindrical member 100 is an intermediate chamber 50. Therefore, the valve seat 10 and the receiving plate 20 are installed facing each other via the intermediate chamber 50.

In this embodiment, the receiving plate 20 is supported at its central portion by the valve seat 10 via the support rod 22a. The support rod 22 a has a proximal end implanted (screwed) in the center of the receiving plate 20 and extends toward the inflow side. The periphery of the support rod 22a is a protrusion 24 of a predetermined height (the height of the intermediate chamber 50). The support rod 22 a is inserted into the center hole 12 of the valve seat 10 at the tip end side. At this time, the projection 24 abuts on the central portion on the outflow side of the valve seat 10. When the projection 24 abuts on the valve seat 10, a predetermined height (height of the intermediate chamber 50) is established between the inflow side of the receiving plate 20 (the periphery of the projection 24) and the outflow side of the valve seat 10. An air gap is formed. The support rod 22a having its tip end inserted into the center hole 12 of the valve seat 10 is fastened to the center portion of the valve seat 10 by screwing a nut 22b into a screw groove formed on the tip end. Ru.

  The support rod 22a may be implanted in the center hole 12 of the valve seat 10 and may extend toward the outflow side. In this case, the support rod 22 a is inserted into the central portion of the receiving plate 20 at the tip end side and fixed to the receiving plate 20. Also in this case, the receiving plate 20 is supported at its central portion by the valve seat 10 via the support rod 22a.

  Further, the receiving plate 20 may be positioned and supported by the outer peripheral surface of the receiving plate 20 by the inner peripheral surface of the cylindrical member 100. In this case, it is not necessary to use the support rod 22a and the nut 22b, and the valve seat 10 does not need to be provided with the central hole 12.

  As shown in FIGS. 1 and 3, a plurality of valve bodies 30 are disposed in the intermediate chamber 50. The valve body 30 is formed in an annular shape corresponding to the arc shape of the opening cross section of the passage 11, ie, an annular shape corresponding to the plurality of annular grooves 13 formed on the outflow side of the valve seat 10 . The valve body 30 has a substantially semicircular longitudinal cross-sectional shape, and the semicircular arc portion is directed to the inflow side, and the semicircular flat portion is directed to the outflow side. The valve body 30 is formed of a metal or a synthetic resin material or a composite material of these.

  FIG. 4 is an enlarged sectional view showing the structure of the main part of the annular valve 1 of FIG.

  As shown in FIG. 4, the valve body 30 opens and closes the passage 11 by being in contact with and separated from the valve seat 10 and from and to both edges of the annular groove 13. In the valve body 30, a portion (upper surface portion in FIG. 4) (inflow side) which opens and closes the passage 11 by coming into contact with and separating from both edges of the annular groove 13 is a sealing surface 31. The sealing surface 31 of the valve body 30 has a torus shape (ring surface shape). The sealing surface 31 and the edges of the annular groove 13 are not in surface contact but in line contact. The sealing surface 31 preferably has the same longitudinal sectional shape on the outer peripheral side and the inner peripheral side of the valve body 30.

  Further, both edges of the annular groove 13 of the valve seat 10, that is, the contact surface 13a against the sealing surface 31 of the valve seat 10 may have a convex torus shape which is smooth with respect to the periphery. Also in this case, the sealing surface 31 and the two edges of the annular groove 13 are in line contact.

  As shown in FIGS. 1, 3 and 4, the receiving plate 20 supports a plurality of spring members 40 in the support holes 23 provided on the inflow side of the receiving plate 20. Each spring member 40 is supported by being inserted into the support hole 23. Each spring member 40 is disposed at a position corresponding to each valve body 30. Each spring member 40 is a compression coil spring, and is disposed between a flat portion which is the outflow side (the lower surface portion in FIGS. 1, 3 and 4) of the valve body 30, and the receiving plate 20. . Each spring member 40 elastically biases the valve body 30 toward the valve seat 10.

In the natural state of the annular valve 1, as shown in FIG. 4 (a), each valve body 30 pushes each sealing surface 31 against both edges of each annular groove 13 by the biasing force of each spring member 40. They are brought into contact with each other to close each passage 11. Then, when the pressure of high-pressure gas in the passage 11 increases and exceeds the biasing force of the spring members 40, the seal surfaces 31 are pressed by the pressure of the gas as shown in FIG. 4B. The valve body 30 is separated from the valve seat 10 against the biasing force of the spring member 40. At this time, the gas in the passage 11 flows from the opening end surface (both edges of the annular groove 13) of the passage 11 to the periphery of each sealing surface 31 and is directed toward the discharge passage 21 of the receiving plate 20. Flow. The gas flowing toward the discharge flow passage 21 is discharged to the outside of the annular valve 1 through the discharge flow passage 21.

  FIG. 5 is a cross-sectional view showing the flow of gas around the sealing surface of the annular valve of FIG. 1 and a conventional annular valve.

  As shown in FIG. 5 (a), the valve body 30 is a pressure loss element (a shape element mainly causing flow separation) to gas flowing into the valve body 30 from the passage flow path 11, for example, a square ridge portion And the like, and the occurrence of pressure loss of gas around the seal surface 31 is suppressed by not having such a pressure loss element. For this reason, the motive cost which sends gas can be reduced. In FIG. 5, the magnitude of the pressure loss is indicated by the magnitude of the velocity ratio due to the local velocity change of the gas around the seal surface 31. In this embodiment, the speed ratio is about 4 or less.

  In addition, when the vertical cross-sectional shape of the seal surface 31 is made the same on the outer peripheral side and the inner peripheral side of the valve body 30, no separation of the gas flowing from the passage passage 11 toward the valve body 30 occurs. Occurrence is suppressed.

  In particular, when both edges of the annular groove 13 of the valve seat 10, that is, the contact surface 13a of the valve seat 10 against the seal surface 31 has a smooth convex torus shape with respect to the periphery, The flow of gas in the surroundings becomes smoother, and the pressure loss of gas can be kept smaller.

  Further, in the annular valve 1, the movement of the valve body 30 is stabilized by eliminating at least one of the pressure loss elements for gas, and the life of the valve body 30, the spring member 40 and the receiving plate 20 is extended. it can.

  In the conventional annular valve, as shown in FIG. 5 (b), the valve plate 130 has a pressure loss element for the gas flowing in from the passage passage 111 toward the valve plate 130, for example, an angular ridge portion or the like. The flow separation occurs around the sealing surface 131, and the pressure loss of the gas increases.

  In the annular valve 1 of the present invention, the shape of the seal surface 31 eliminates pressure loss elements for gas based on CFD (computational fluid dynamics) analysis and wind tunnel experiments, and the effective area for gas flow is maximized. It is decided to become By maximizing the effective area, the occurrence of pressure loss of gas around the sealing surface 31 can be suppressed. The effective area for the gas flow is correlated with the magnitude of the flow path resistance, and when the effective area is maximized, the geometrical flow path area required to obtain the same effective area is small. Become.

  FIG. 6 is a graph showing the coefficient of resistance around the sealing surface of the annular valve of FIG. 1 and a conventional annular valve.

  As shown in FIG. 6, with respect to the annular valve 1 of the present invention and the conventional annular valve, the valve lift (the amount of movement of the valve body 30), ie, the sealing surface 31 of the valve body 30 and both edges of the annular groove 13 The relationship between the distance and the resistance coefficient ratio (comparison value of values corresponding to the Cd value) was determined. Assuming that the coefficient of resistance at a valve lift of 2.0 mm in the conventional annular valve is 1.0, in the conventional annular valve, the coefficient of resistance ratio is about 0.65 at a valve lift of 1.0 mm. On the other hand, in the annular valve 1 of the present invention, the resistance coefficient ratio is about 0.54 at a valve lift of 1.0 mm, and the resistance coefficient ratio increases only to about 0.74 even at a valve lift of 2.0 mm. That is, in the annular valve 1 of the present invention, even if the valve lift is increased and more gas flows from the passage passage 11 toward the discharge passage 21, the coefficient of resistance does not increase as compared with the conventional annular valve. The occurrence of pressure loss of gas around the sealing surface 31 is suppressed.

  In the annular valve 1 of the present invention, as shown in FIG. 6, the occurrence of pressure loss of gas around the sealing surface 31 is suppressed by the small resistance coefficient, and the movement of the valve body 30 is stabilized. 30, the life of the spring member 40 and the receiving plate 20 can be extended.

10: valve seat 11: passage 12: central hole 13: annular groove 13a: contact surface 14: wall 20: receiving plate 21: discharge channel 22a: support rod 22b: nut 23: support hole 24: projection 30: Valve body 31: Sealing surface 40: Spring member 50: Intermediate chamber 100: Cylindrical member

1.
A flat valve seat,
An open cross-section having an arc shape, and a passage flow passage arranged concentrically with the central axis of the valve seat as a center;
An annular groove connecting the passage channels on the same circle;
A flat plate-like receiving plate having a discharge flow path and disposed opposite to the valve seat via an intermediate chamber;
A valve body which is formed in an annular shape corresponding to the arc shape of the opening cross section of the passage, is disposed in the intermediate chamber, and opens and closes the passage by coming in and out of contact with the valve seat;
A spring member supported by the receiving plate and resiliently urging the valve body toward the valve seat;
Sealing surface facing the passage channel of the valve body is a torus which eliminated the pressure loss element for gas flowing toward the valve body before Symbol passage channel,
An annular valve characterized in that a surface of the valve seat facing the sealing surface has a torus shape in which a pressure loss element for gas flowing in from the passage to the valve body is eliminated .
2.
The annular valve according to claim 1, wherein the sealing surface of the valve body opposed to the passage has the same longitudinal sectional shape on the outer peripheral side and the inner peripheral side of the valve body.

Claims (3)

A flat valve seat,
An open cross-section having an arc shape, and a passage flow passage arranged concentrically with the central axis of the valve seat as a center;
An annular groove connecting the passage channels on the same circle;
A flat plate-like receiving plate having a discharge flow path and disposed opposite to the valve seat via an intermediate chamber;
A valve body which is formed in an annular shape corresponding to the arc shape of the opening cross section of the passage, is disposed in the intermediate chamber, and opens and closes the passage by coming in and out of contact with the valve seat;
A spring member supported by the receiving plate and resiliently urging the valve body toward the valve seat;
The sealing surface of the valve body opposed to the passage flow path has a torus shape and a shape in which a pressure loss element for the gas flowing from the passage flow path toward the valve body is eliminated.
There is no level | step difference between the said receiving plate and the said valve body, The annular valve characterized by the above-mentioned.   The annular valve according to claim 1, wherein the sealing surface of the valve body opposed to the passage has the same longitudinal sectional shape on the outer peripheral side and the inner peripheral side of the valve body.   The surface of the valve seat that faces the sealing surface has a convex torus shape that is smooth with respect to the periphery, and a shape that eliminates pressure loss elements for the gas that has flowed from the passage toward the valve body. The annular valve according to claim 1 or 2, characterized in that: