JP2016070326A - On-off valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an on-off valve capable of improving flow rate performance.SOLUTION: A shut-off valve comprises: a fourth part forming an intermediate flow passage 24; a first part forming a first flow passage 21; a second part forming a second flow passage 22; a valve body; and a guide part 30. The first flow passage 21 extends from the intermediate flow passage 24 in a direction X. The second flow passage 22 extends from the intermediate flow passage 24 in a direction crossing with the direction X. The valve body is changed over between an ON state and an OFF state. The ON state means that the extremity end part of the valve body forms the intermediate flow passage 24 together with the fourth part, to allow fluid to flow from the first flow passage 21 toward the second flow passage 22 through the intermediate flow passage 24. The OFF state means that the motion of the valve body in a direction Y causes a flow of the fluid to be shut off. The guide part 30 is positioned at an opposite Y direction in the first flow passage 21. Then, the guide part 30 guides the fluid flowing from the first flow passage 21 toward the intermediate flow passage 24 to the second flow passage 22.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an on-off valve.

  2. Description of the Related Art Conventionally, there is an open / close valve that allows or shuts off the flow of fluid flowing through a flow path by moving a valve body in a predetermined direction with respect to the flow path. For example, in the refrigerant shut-off valve as an on-off valve described in Patent Document 1 (Japanese Patent Laid-Open No. 2006-2798), when the flow path is closed, the valve body is in a direction close to a valve seat provided in the flow path (hereinafter referred to as a valve seat) When the flow path is opened, the valve body is moved in the direction opposite to the first direction (hereinafter referred to as the second direction) to allow the flow of fluid flowing through the flow path. You are blocking or blocking.

  Here, depending on the shape of the flow path of the on-off valve, the flow velocity of the fluid flowing through the flow path may decrease. If it does so, the pressure loss of the fluid in a flow path will become large, and the flow performance in an on-off valve will fall. In order to reduce this pressure loss, in patent document 1, the valve body gives to the flow of a refrigerant | coolant by providing the recessed part which becomes depressed toward a 2nd direction in the front end surface of the valve body which forms a part of flow path. The effect is reduced and the pressure loss of the refrigerant is reduced.

  Incidentally, there is a demand for further improvement in the flow rate performance of the on-off valve.

  Then, the subject of this invention is providing the on-off valve which can improve flow volume performance.

  The on-off valve according to the first aspect of the present invention includes a bent portion, an inlet portion, an outlet portion, a valve body, and a guide portion. The bent portion forms a bent flow path. The inlet portion forms an inlet channel. The inlet channel extends from the curved channel in the X direction. The outlet portion forms an outlet channel. The outlet channel extends from the curved channel in the Y direction. The Y direction is a direction that intersects the X direction. The valve body switches between an open state and a closed state. The open state is a state in which the flow of fluid from the inlet channel to the outlet channel through the bent channel is permitted by forming the bent channel with the bent part at the tip of the valve body. The closed state is a state in which the flow of the fluid is blocked by the valve body moving in the Y direction. The guide part is located on the reverse Y direction side in the inlet channel. And a guide part guides the fluid which flows toward a curved channel from an entrance channel to the exit channel side.

  In the on-off valve according to the first aspect of the present invention, the fluid flowing from the inlet channel toward the curved channel can be guided to the outlet channel side because of the guide portion. For this reason, the pressure loss of the fluid in a flow path can be reduced.

  As a result, the flow rate performance can be improved.

  The on-off valve according to a second aspect of the present invention is the on-off valve according to the first aspect, wherein the guide part projects from the inner surface of the inlet part toward the center side of the inlet channel. In this on-off valve, the pressure loss in the flow path can be reduced by a simple configuration in which the inner surface of the inlet portion projects toward the center side of the inlet flow path.

  The on-off valve according to a third aspect of the present invention is the on-off valve according to the first aspect or the second aspect, wherein a dead water area is formed on the downstream side of the guide portion in the fluid flow direction. In this on-off valve, since the dead water area is formed, it is possible to reduce a possibility that the flow direction of the fluid adjusted by the guide portion deviates from a desired direction.

  The on-off valve according to a fourth aspect of the present invention is the on-off valve according to any one of the first to third aspects, wherein the guide portion blocks 10 to 30% of the cross-sectional area in the Y-direction cross section of the inlet channel. It is configured. In this on-off valve, the guide portion blocks 10 to 30% of the cross-sectional area in the Y-direction cross section of the inlet channel.

  The on-off valve according to a fifth aspect of the present invention is the on-off valve according to any one of the first to fourth aspects, wherein the inlet channel has a cylindrical shape. The ratio of the dimension of the guide portion to the inner diameter of the inlet channel in a portion parallel to the Y direction and passing through the center of the inlet channel in the Y channel cross section of the inlet channel is 0.2 to 0.3. In this on-off valve, the ratio of the dimension of the guide portion of the predetermined portion to the inner diameter of the inlet channel is 0.2 to 0.3.

  The on-off valve according to a sixth aspect of the present invention is the on-off valve according to any one of the first to fifth aspects, wherein a dead water area is formed downstream of the guide portion in the fluid flow direction. The dimension of the dead water area in the X direction is larger than the maximum dimension of the guide portion in the Y direction. In this on-off valve, the dimension in the X direction of the dead water area is larger than the dimension in the Y direction of the guide portion.

  The on-off valve according to a seventh aspect of the present invention is the on-off valve according to any one of the first to sixth aspects, wherein the guide part projects from the inner surface of the inlet part toward the center side of the inlet channel. The front end surface of the guide portion is a surface parallel to the X direction. The dimension of the tip surface in the X direction is smaller than the maximum dimension of the guide portion in the Y direction. In this on-off valve, the dimension in the X direction of the distal end surface of the guide part is smaller than the maximum dimension in the Y direction of the guide part.

  The on-off valve according to an eighth aspect of the present invention is the on-off valve according to any one of the first to seventh aspects, wherein the guide portion projects from the inner surface of the inlet portion toward the center of the inlet passage. The outlet channel has a cylindrical shape. The surface located on the most downstream side in the flow direction of the fluid in the guide portion is arranged at a position away from the center line of the outlet channel by a length of 104 to 167% of the inner diameter of the outlet channel in the X direction. Yes. In this on-off valve, the surface of the guide portion located on the most downstream side in the fluid flow direction is separated from the center line of the outlet channel by a length of 104 to 167% of the inner diameter of the outlet channel in the X direction. In position.

  With the on-off valve according to the first aspect of the present invention, the flow rate performance can be improved.

  In the on-off valve according to the second aspect of the present invention, pressure loss in the flow path can be reduced with a simple configuration.

  In the on-off valve according to the third aspect of the present invention, it is possible to reduce a possibility that the flow direction of the fluid adjusted by the guide portion deviates from a desired direction.

  In the on-off valve according to the fourth aspect of the present invention, the guide portion blocks 10 to 30% of the cross-sectional area in the Y-direction cross section of the inlet channel.

  In the on-off valve according to the fifth aspect of the present invention, the ratio of the dimension of the guide portion of the predetermined portion to the inner diameter of the inlet channel is 0.2 to 0.3.

  In the on-off valve according to the sixth aspect of the present invention, the dimension of the dead water area in the X direction is larger than the dimension of the guide portion in the Y direction.

  In the on-off valve according to the seventh aspect of the present invention, it is smaller than the maximum dimension of the guide portion in the Y direction.

  In the on-off valve according to the eighth aspect of the present invention, the surface of the guide portion located on the most downstream side in the fluid flow direction is 104 to 167 of the inner diameter of the outlet channel from the center line of the outlet channel toward the X direction. % Apart.

Sectional drawing of the closing valve as a prior art. The perspective view which showed typically the flow path of the closing valve as a prior art. The perspective view which showed typically the flow path of the closing valve which concerns on this embodiment. Sectional drawing which showed typically the flow path of the closing valve which concerns on this embodiment. Sectional drawing of the Y direction of a 1st flow path. The figure which shows the outline of the flow velocity distribution in the closing valve as a prior art. The figure which shows the outline of the flow velocity distribution in the closing valve which concerns on this embodiment.

  Hereinafter, a closing valve 10 as an on-off valve according to an embodiment of the present invention will be described with reference to the drawings. The following embodiments are specific examples of the present invention and do not limit the technical scope of the present invention. In addition, hereinafter, before describing the closing valve 10 according to the present embodiment, the configuration of a closing valve 10 ′ as a conventional technique will be described.

(1) Configuration of a closing valve 10 'as a conventional technique FIG. 1 is a cross-sectional view of a closing valve 10' as a conventional technique. FIG. 2 is a perspective view schematically showing a flow path 20 ′ of a closing valve 10 ′ as a conventional technique. The closing valve 10 ′ is a closing valve 10 ′ provided in the air conditioner outdoor unit, and a refrigerant flows as a fluid in the flow path 20 ′. The closing valve 10 ′ mainly includes a main body 11, a valve body 12, a valve lid 13, and a flare nut 14.

  The main body 11 has a first part 11a 'as an inlet part, a second part 11b as an outlet part, a third part 11c, and a fourth part 11d as a bent part. Each part 11a'-11d is exhibiting the cylindrical shape, for example, and the cylindrical through-hole is provided in the inside. Each of the first part 11a ', the second part 11b, and the third part 11c has one end connected to the fourth part 11d so that the inner peripheral surface (inner surface) of each through hole is continuous.

  A first connection port 15 to which a communication pipe (not shown) is connected is provided at the other end of the first part 11a '. The other end of the second part 11b is provided with a second connection port 16 to which the internal piping of the air conditioner outdoor unit is connected. An operation port 17 into which a wrench for moving the valve body 12 is inserted is provided at the other end of the third portion 11c.

  Moreover, the 2nd part 11b, the 3rd part 11c, and the 4th part 11d are arrange | positioned along with the same axis | shaft, as shown in FIG. The second part 11b intersects the first part 11a 'so as to form a predetermined angle. The third part 11c intersects the first part 11a 'so as to form a predetermined angle. Here, the second part 11b forms an angle of about 90 degrees with respect to the first part 11a '. The third portion 11c forms an angle of about 90 degrees with respect to the first portion 11a '.

  A first flow path 21 ′ as an inlet flow path is formed inside the first portion 11 a ′. A second flow path 22 as an outlet flow path is formed inside the second portion 11b. A valve passage 23 is formed in the third portion 11c. An intermediate flow path 24 as a curved flow path is formed inside the fourth portion 11d. That is, the first flow path 21 ′, the second flow path 22, and the valve passage 23 are radially arranged in three directions around the intermediate flow path 24, and communicate with the intermediate flow path 24. The second flow path 22 and the valve passage 23 are arranged coaxially with the intermediate flow path 24 interposed therebetween. A part of the intermediate flow path 24 is constituted by a distal end portion 12a of the valve body 12 to be described later. Further, a valve seat 18 is provided at the boundary between the intermediate flow path 24 and the second flow path 22 so that the distal end portion 12a of the valve body 12 contacts and separates. With such a configuration, the first flow path 21 ′, the intermediate flow path 24, and the second flow path 22 form a flow path 20 ′ bent by a predetermined angle in the intermediate flow path 24. Here, the flow path 20 ′ has an L shape bent at 90 degrees in the intermediate flow path 24.

  Hereinafter, for convenience of explanation, among the directions parallel to the axis of the first flow path 21 ′, the direction from the intermediate flow path 24 side to the first flow path 21 ′ side, that is, from the intermediate flow path 24 to the first flow path 21. The direction in which 'extends is referred to as the X direction, and the opposite direction from the first flow path 21' side to the intermediate flow path 24 side is referred to as the reverse X direction. Of the directions parallel to the axis passing through the second flow path 22, the valve passage 23, and the intermediate flow path 24, the direction from the valve passage 23 side to the second flow path 22 side, that is, from the intermediate flow path 24 to the second flow path. The direction in which the flow path 22 extends is referred to as the Y direction, and the opposite direction from the second flow path 22 side to the valve passage 23 side is referred to as the reverse Y direction.

  The valve body 12 has an outer shape that can be inserted through the valve passage 23 (here, a cylindrical outer shape), and is disposed in the valve passage 23 so that the valve passage 23 of the third portion 11c can move in the axial direction. Yes. The distal end portion 12 a of the valve body 12 faces the intermediate flow path 24. Moreover, the front-end | tip part 12a of the valve body 12 is formed in the taper shape which diameter-reduces toward a Y direction. A thread 19 a that meshes with each other is formed between the side surface of the valve body 12 and the inner surface of the main body 11. A hexagonal hole 19b into which a hexagonal wrench can be inserted is formed at the rear end of the valve body 12. By inserting and rotating the hexagon wrench into the hexagon hole 19b, the valve body 12 rotating together with the hexagon wrench can be moved in the axial direction in the Y direction or the reverse Y direction.

  The valve body 12 is switched between an open state and a closed state. As shown in FIG. 1, in the open state in which the closing valve 10 ′ is opened, a series of flow paths 20 ′ (first flow path 21 ′, intermediate flow path 24, and second flow path 22) communicate with each other. . At this time, the distal end portion 12a of the valve body 12 forms the intermediate flow path 24 together with the bent portion. As described above, when the closing valve 10 ′ is in the open state, the refrigerant flow from the first flow path 21 ′ to the second flow path 22 through the intermediate flow path 24 is permitted. When closing the closed valve 10 ′ in the open state, the valve body 12 is moved in the Y direction while rotating, thereby bringing the front end portion 12a of the valve body 12 and the valve seat 18 into contact with each other. The flow path 21 ′ and the second flow path 22 are blocked. In this closed state, the tip 12 a of the valve body 12 is in contact with the valve seat 18. Further, in this state, the tip 12a of the valve body 12 and the second flow path 22 are closed without a gap, and the intermediate flow path 24 is closed. As described above, when the closing valve 10 ′ is in the closed state, the refrigerant flow from the first flow path 21 ′ to the second flow path 22 through the intermediate flow path 24 is blocked. When opening the closed valve 10 ′ in the closed state, the tip 12a is moved away from the valve seat 18 by moving the valve body 12 in the reverse Y direction while rotating the first flow passage 21 ′. And the second flow path 22 are communicated with each other.

  The valve lid 13 is normally attached to the other end of the third portion 11 c and closes the operation port 17. A thread that meshes with each other is formed between the inner surface of the valve lid 13 and the outer peripheral surface of the main body 11. When the closing valve 10 'is opened and closed, the valve lid 13 is removed from the other end of the third portion 11c.

(2) Configuration of the closing valve 10 according to the present embodiment FIG. 3 is a perspective view schematically showing the flow path 20 of the closing valve 10 according to the present embodiment. FIG. 4 is a diagram schematically showing the flow path 20 of the closing valve 10 according to the present embodiment cut in parallel to the XY plane. 5 is a cross-sectional view of the first flow path 21 in the Y direction, showing a state cut in the direction of the arrow in FIG.

  Next, the closing valve 10 according to the present embodiment will be described. The closing valve 10 according to the present embodiment has the same configuration as that of the conventional closing valve 10 'except that the configuration of the first portion 11a is different. Therefore, here, only the configuration of the first part 11a will be described in detail, and for the other configurations, the same reference numerals as those used in the description of the closing valve 10 ′ in the prior art will be adopted, and the description thereof will be made. Omitted.

(2-1) First part 11a
The first part 11a has, for example, a cylindrical shape, and a cylindrical through hole is provided inside. One end of the first part 11a is connected to the fourth part 11d so as to communicate with the through hole of the fourth part 11d. The other end of the first part 11a is provided with a first connection port 15 to which a communication pipe (not shown) is connected. The first part 11a intersects with the second part 11b so as to form a predetermined angle. The first part 11a intersects the third part 11c so as to form a predetermined angle. In the present embodiment, the first part 11a forms an angle of about 90 degrees with each of the second part 11b and the third part 11c.

  A first flow path 21 as an inlet flow path is formed inside the first portion 11a. The first flow path 21, the second flow path 22, and the valve path 23 are arranged radially in three directions around the intermediate flow path 24, and communicate with the intermediate flow path 24.

  The first flow path 21 formed by the first portion 11a is provided with a guide portion 30 that guides the fluid flowing from the first flow path 21 toward the intermediate flow path 24 toward the second flow path 22 side. . The guide part 30 protrudes from the inner peripheral surface (inner surface) of the first part 11a toward the center side of the first flow path 21, that is, in the Y direction.

(2-2) Guide part 30
As shown in FIG. 5, which is a cross-sectional view of the first flow path 21 in the Y direction, the guide portion 30 is provided so as to close a portion located in the reverse Y direction in the cylindrical first flow path 21. . For this reason, the dimension of the guide portion 30 in the direction parallel to the Y direction in the cross section in the Y direction of the first flow path 21 is the portion passing through the center of the first flow path 21. Moreover, the guide part 30 is comprised so that 10-30% of the cross-sectional area in the Y direction cross section of the 1st flow path 21 may be interrupted, Preferably it is 15-20%. Here, in the shutoff valve 10 of the present embodiment, the maximum dimension m1 in the direction parallel to the Y direction of the guide portion 30 with respect to the inner diameter d1 (4.8 mm) of the first flow path 21 is 1.0 <m1 <1. It is designed to be 5 mm (preferably 1.1 mm). Therefore, the inner diameter d14. The ratio of the maximum dimension m1 in the direction parallel to the Y direction of the guide portion 30 is 0.2 to 0.3.

  And the front end surface 31 of the guide part 30 is a surface parallel to the axial direction of the 1st flow path 21, ie, an X direction. The dimension m2 in the X direction of the tip surface 31 is designed to be smaller than the maximum dimension m1 in the direction parallel to the Y direction of the guide part 30. Specifically, since the maximum dimension m1 in the direction parallel to the Y direction of the guide part 30 is 1.0 <m1 <1.5 mm (preferably 1.1 mm), the dimension of the distal end surface 31 in the X direction. m2 is designed to be 0.5 <m2 <1.0 mm (preferably 0.5 mm), and is smaller than the maximum dimension m1 of the guide portion 30 in the direction parallel to the Y direction.

  Furthermore, the back surface 32, which is the surface located on the most downstream side in the flow direction of the fluid from the first flow path 21 to the intermediate flow path 24 in the guide portion 30, is based on the axis that is the center line of the second flow path 22. It is arranged at a position separated by a predetermined distance m3 in the X direction. Here, the predetermined distance m3 is designed to be 104 to 167% of the inner diameter d2 of the second flow path 22. Here, in the closing valve 10 of the present embodiment, the distance between the axis of the valve body 12 and the back surface 32 of the guide portion 30 is designed to be 5.0 to 8.0 mm (preferably 6.8 mm). For this reason, the predetermined distance m3 is 104 to 167% of the inner diameter d2 (4.8 mm) of the second flow path 22.

  In the first flow path 21, a dead water area A <b> 1 in which the fluid flows is formed on the downstream side of the guide portion 30 in the fluid flow direction, that is, on the back surface 32 side of the guide portion 30. In this embodiment, the maximum dimension m1 of the guide portion 30 in the direction parallel to the Y direction is designed to be smaller than the dimension m4 of the dead water area A1 in the X direction.

(3) Flow of Refrigerant in Closure Valve 10 FIG. 6 is a diagram showing an outline of a flow velocity distribution in the closure valve 10 ′ as a related art according to a comparative example. FIG. 7 is a diagram showing an outline of the flow velocity distribution in the closing valve 10 according to the present embodiment. In addition, FIG. 7 has shown the analysis result about the closing valve 10 whose each dimension m1-m3 is m1 = 1.1mm, m2 = 0.5mm, and m3 = 6.8mm. Simulation analysis of the flow of the fluid in the closing valve 10 ′ and the flow paths 20 ′, 20 of the closing valve 10 has shown in FIGS.

  In the case of the closing valve 10 ′, the fluid flow that has flowed from the first flow path 21 ′ to the intermediate flow path 24 collides with a surface 24 a located in the reverse X direction in the intermediate flow path 24. Thereafter, the fluid flows along the surface 22 a located in the reverse X direction in the second flow path 22 and flows out from the second flow path 22. As described above, in the closing valve 10 ′, the fluid flow collides with the surface 24 a of the intermediate flow path 24, so that the velocity vector in the intermediate flow path 24 is diffused, and the pressure loss of the fluid in the intermediate flow path 24 increases. For this reason, flow performance (Cv value) will become low.

  On the other hand, in the case of the shut-off valve 10 including the guide part 30, the flow of the fluid flowing along the surface 21a located in the reverse Y direction of the first flow path 21 collides with the front surface 33 of the guide part 30, A downward force is applied to the fluid flow. Then, in a region near the surface 24a located in the reverse X direction in the intermediate flow path 24, a vortex is generated in the fluid flow, and as a result, the fluid flow hardly collides with the surface 24a of the intermediate flow path 24. For this reason, the pressure loss of the fluid resulting from the fluid flow colliding with the surface 24a of the intermediate flow path 24 is reduced, and the flow rate performance is improved.

  Here, when the dimension m2 of the guide part 30 is too large (for example, 1.8 mm), the flow of the fluid along the surface 21a located in the reverse Y direction of the first flow path 21 is the front surface 33 of the guide part 30. Although a downward force is applied to the fluid flow, the fluid flow is along the distal end surface 31 of the guide portion 30. As a result, the vortex as shown in FIG. 7 does not occur in the region near the surface 24 a of the intermediate flow path 24, and the fluid flow collides with the surface 24 a located in the reverse X direction in the intermediate flow path 24. Thereby, compared with the closing valve 10, the pressure loss of the fluid in the intermediate flow path 24 will become large.

  In addition, when the dimension of the guide portion 30 in the direction parallel to the Y direction is large (for example, m1 = 1.5 mm), the opening area of the portion where the guide portion 30 is present in the first flow path 21 is narrowed. The pressure loss of the fluid in the first flow path 21 becomes large. As a result, even if the pressure loss of the fluid in the intermediate flow path 24 is reduced, the flow rate performance of the flow path 20 as a whole is smaller than that of the closing valve 10. In addition, when the dimension of the direction parallel to the Y direction of the guide part 30 is small (for example, m1 = 0.5 mm), the flow of the fluid which flows along the surface 21a located in the reverse Y direction of the 1st flow path 21. Even if it collides with the front surface 33 of the guide portion 30, the downward force applied to the fluid flow is weakened. As a result, the flow of the fluid is not changed as much as the closing valve 10, and a vortex like the closing valve 10 does not occur in the region near the surface 24 a of the intermediate flow path 24, and the surface positioned in the reverse X direction in the intermediate flow path 24. The fluid flow collides with 24a. Thereby, compared with the closing valve 10, the pressure loss of the fluid in the intermediate flow path 24 will become large.

  Furthermore, when the predetermined distance m3 is long (for example, 8.5 mm), the distance from the guide portion 30 to the second flow path 22 is long, and therefore, along the surface 21a located in the reverse Y direction of the first flow path 21. Although a downward force is applied to the fluid flow by the fluid flow that collides with the front surface 33 of the guide portion 30, the effect of guiding the fluid flow to the second flow path 22 side is reduced. As a result, in the region near the surface 24 a of the intermediate flow path 24, a vortex unlike the shutoff valve 10 does not occur, and the fluid flow collides with the surface 24 a located in the reverse X direction in the intermediate flow path 24. Thereby, compared with the closing valve 10, the pressure loss of the fluid in the intermediate flow path 24 will become large. In addition, when the predetermined distance m3 is short (for example, 5.0 mm), the distance between the guide portion 30 and the valve body 12 is short, so that the fluid flowing along the surface 21a located in the reverse Y direction of the first flow path 21. Although a downward force is applied to the fluid flow by the collision of the fluid flow with the front surface 33 of the guide portion 30, the fluid flow is along the distal end surface 12 f of the distal end portion 12 a of the valve body 12. Then, the fluid flow collides with the surface 24a located in the reverse X direction in the intermediate flow path 24. As a result, the velocity vector in the intermediate flow path 24 is diffused, and the pressure loss of the fluid in the intermediate flow path 24 is increased as compared with the closing valve 10.

(4) Features (4-1)
In the present embodiment, the guide portion 30 that guides the fluid flowing from the first flow path 21 toward the intermediate flow path 24 toward the second flow path 22 on the reverse Y direction side of the first flow path 21 is provided in the first flow path 21. It is provided in the path 21. By providing the guide part 30, the pressure loss of the fluid in the flow path 20 can be reduced.

  Thereby, the flow rate performance can be improved.

(4-2)
The guide part 30 of this embodiment protrudes toward the center side of the 1st flow path 21 from the internal peripheral surface of the 1st part 11a. Thus, the pressure loss in the flow path 20 can be reduced with a simple configuration.

  Here, it is desired to improve the flow rate performance by reducing the pressure loss of the fluid in the flow path of the on-off valve. In particular, in the on-off valve having a small inner diameter of the flow path, the pressure loss of the fluid in the flow path Since it greatly affects performance, improvement is required.

  By the way, it is generally known that when a resistance is provided to the flow of fluid in the flow path, the pressure loss of the fluid in the flow path increases. For this reason, conventionally, although there is a means for processing and rectifying the valve body included in the on-off valve, a means for providing a resistance in the flow path has not been used.

  As a result of intensive studies, the present inventors have provided a guide portion 30 that is resistant to the flow of fluid on the reverse Y direction side of the first flow path 21, and the flow of fluid is on the second flow path 22 side. It has been found that the pressure loss of the fluid in the entire flow path 20 can be reduced by changing the flow direction to a gentle flow direction of the fluid that collides with the surface 24a of the intermediate flow path 24.

  In the present embodiment, a vortex is intentionally generated in the intermediate flow path 24 by providing the guide portion 30 that protrudes from the inner peripheral surface of the first portion 11a toward the center side of the first flow path 21, so that the intermediate flow path By reducing the flow direction of the fluid that collides with the surface 24a of 24, the pressure loss of the fluid in the entire flow path 20 is reduced.

(4-3)
In the present embodiment, in the first flow path 21, a dead water area A <b> 1 where the flow of fluid stagnates is formed on the downstream side of the guide portion 30 in the fluid flow direction. For this reason, it is possible to reduce the possibility that the fluid flow adjusted by colliding with the front surface 33 of the guide portion 30 is along the distal end surface 12 f of the valve body 12. Thereby, the possibility that the flow direction of the fluid adjusted by the guide part 30 may deviate from a desired direction can be reduced.

(4-4)
Here, in the cross-sectional area of the first flow path 21 in the Y-direction cross section, if the area blocked by the guide portion 30 is too small, the rectifying effect by the guide portion 30 is reduced. On the other hand, if the area blocked by the guide portion 30 is too large in the cross-sectional area of the first flow path 21 in the Y-direction cross section, the pressure loss of the fluid in the first flow path 21 increases.

  The guide part 30 of the present embodiment is configured to block 10 to 30% of the cross-sectional area of the first flow path 21 in the Y-direction cross section. By providing the guide part 30 in this way, an increase in the pressure loss of the fluid in the first flow path 21 can be reduced while the rectifying effect by the guide part 30 is exhibited.

(4-5)
Here, when the dimension of the guide portion 30 in the direction parallel to the Y direction is large, the opening area of the portion where the guide portion 30 is located in the first flow path 21 is narrowed, so the fluid pressure in the first flow path 21 Loss will increase. If it does so, even if the pressure loss of the fluid in the intermediate flow path 24 is reduced, the flow volume performance as the whole flow path 20 will become small. On the other hand, when the dimension of the guide portion 30 in the direction parallel to the Y direction is small, the flow of the fluid flowing along the surface 21 a located in the reverse Y direction of the first flow path 21 collides with the front surface 33 of the guide portion 30. However, the downward force applied to the fluid flow is weakened. If it does so, the rectification effect of the fluid adjusted by the guide part 30 will become thin.

  As a result of intensive studies, the inventors set the ratio of the maximum dimension m1 in the direction parallel to the Y direction of the guide portion 30 to the inner diameter of the first flow path 21 to be 0.2 to 0.3, so that the guide portion It has been found that the rectifying effect of 30 can be sufficiently exerted and the pressure loss of the fluid in the flow path 20 can be reduced.

  In the present embodiment, the maximum dimension m1 in the direction parallel to the Y direction of the guide portion 30 with respect to the inner diameter d1 (4.8 mm) of the first flow path 21 is 1.0 <m1 <1.5 mm (preferably 1. 1 mm). For this reason, in this shutoff valve 10, the ratio of the maximum dimension m1 in the direction parallel to the Y direction of the guide part 30 to the inner diameter of the first flow path 21 is 0.2 to 0.3. The flow rectifying effect can be sufficiently exhibited, and the pressure loss of the fluid in the flow path 20 can be reduced.

(4-6)
In the present embodiment, the dimension m4 in the X direction of the dead water area A1 is designed to be larger than the maximum dimension m1 in the direction parallel to the Y direction of the guide part 30. Thereby, the rectification effect of the guide part 30 can fully be exhibited.

(4-7)
Here, if the dimension m2 in the X direction of the tip surface 31 of the guide part 30 is too large, the fluid flow along the surface 21a located in the reverse Y direction of the first flow path 21 collides with the front surface 33 of the guide part 30. Thus, although a downward force is applied to the fluid flow, the fluid flow is along the distal end surface 31 of the guide portion 30. Then, the fluid flow collides with the surface 24a located in the reverse X direction in the intermediate flow path 24, and the pressure loss of the fluid in the intermediate flow path 24 increases.

  As a result of intensive studies, the inventors have determined that the dimension m2 in the X direction of the distal end surface 31 of the guide portion 30 is not more than a predetermined size so that the fluid flow does not follow the distal end surface 31 of the guide portion 30. I found out that I can do it.

  Therefore, in the present embodiment, the dimension m2 in the X direction of the distal end surface 31 of the guide part 30 is made smaller than the maximum dimension m1 in the direction parallel to the Y direction of the guide part 30. Thereby, since the flow of the fluid can be prevented from being along the distal end surface 31 of the guide portion 30, the pressure loss of the fluid in the intermediate flow path 24 can be reduced.

(4-8)
Here, if the distance between the guide portion 30 and the second flow path 22 (valve body 12) is too short, the influence of the valve body 12 becomes strong, and the flow of fluid flows to the distal end surface 12f of the distal end portion 12a of the valve body 12. The speed vector tends to spread by being along. On the other hand, if the distance between the guide part 30 and the second flow path 22 is too long, the rectifying effect of the fluid adjusted by the guide part 30 becomes thin.

  As a result of intensive studies, the present inventors have determined that the back surface 32 of the guide portion 30 is 104 to the inner diameter d2 of the second flow path 22 from the axis that is the center line of the second flow path 22 in the X direction. It has been found that the rectifying effect by the guide portion 30 can be sufficiently exerted by disposing it at a position separated by a length of 167%.

  Therefore, in this embodiment, the position where the back surface 32 of the guide portion 30 is separated by a length of 104 to 167% of the inner diameter d2 of the second flow path 22 in the X direction with the axis of the second flow path 22 as the base point. Is arranged. For this reason, the rectification effect of the guide part 30 can fully be exhibited.

(5) Modification (5-1) Modification A
In the said embodiment, the through-hole provided in the 1st-4th parts 11a-11d is exhibiting the cylindrical shape. That is, the first flow path 21, the second flow path 22, and the intermediate flow path 24 have a cylindrical shape. However, the shape of the through hole is not limited to this, and may be, for example, an elliptical shape, a polygonal shape such as a triangular shape, a quadrangular shape, or a pentagonal shape.

(5-2) Modification B
In the above embodiment, the flow path 20 is bent at 90 degrees in the intermediate flow path 24, and the first flow path 21 and the second flow path 22 form an angle of about 90 degrees. For this reason, the X direction and the Y direction are orthogonal to each other. However, the bending angle of the flow path 20 is not limited to this, and the first flow path 21 and the second flow path 22 intersect so as to form a predetermined angle, and the flow path 20 is bent at the intermediate flow path 24. It only has to be.

(5-3) Modification C
In the above embodiment, the closing valve 10 is described as an example. However, the on-off valve according to the present invention is not limited to the closing valve, and is, for example, an on / off valve that permits / blocks the flow of fluid in the flow path. Also good.

  INDUSTRIAL APPLICABILITY The present invention can improve flow rate performance and is effectively applied to an on-off valve having a curved flow path.

10 Closing valve (open / close valve)
11a Part 1 (Inlet)
11b Part 2 (exit part)
11d Part 4 (curved part)
12 Valve body 12a Tip (tip)
21 First channel (inlet channel)
22 Second channel (outlet channel)
24 Intermediate channel (curved channel)
30 Guide portion 31 Tip surface 32 Back surface (surface)

JP 2006-2798 A

Claims (8)

A bend (11d) forming a bend channel (24);
An inlet part (11a) forming an inlet channel (21) extending in the X direction from the curved channel;
An outlet portion (11b) that forms an outlet channel (22) extending in the Y direction intersecting the X direction from the curved channel;
An open state in which the tip (12a) forms the curved flow path together with the curved portion to allow the flow of fluid from the inlet flow path to the outlet flow path through the curved flow path, and the Y A valve body (12) that switches to a closed state that blocks the flow of the fluid by moving in a direction;
A guide portion (30) that is located on the reverse Y direction side in the inlet flow path and guides the fluid flowing from the inlet flow path toward the curved flow path toward the outlet flow path;
An on-off valve (10). The guide part protrudes from the inner surface of the inlet part toward the center side of the inlet channel,
The on-off valve according to claim 1. A dead water area (A1) is formed on the downstream side of the guide portion in the fluid flow direction.
The on-off valve according to claim 1 or 2. The guide portion is configured to block 10 to 30% of a cross-sectional area in the Y-direction cross section of the inlet channel.
The on-off valve according to any one of claims 1 to 3. The inlet channel has a cylindrical shape,
The ratio of the dimension (m1) of the guide portion to the inner diameter (d1) of the inlet channel in a portion that is parallel to the Y direction and passes through the center of the inlet channel in the Y-direction cross section of the inlet channel, 0.2-0.3,
The on-off valve according to any one of claims 1 to 4. A dead water area (A1) is formed on the downstream side of the guide portion in the fluid flow direction,
The dimension (m4) in the X direction of the dead water area is larger than the maximum dimension (m1) in the Y direction of the guide portion.
The on-off valve according to any one of claims 1 to 5. The guide part protrudes from the inner surface of the inlet part toward the center side of the inlet channel,
The front end surface (31) of the guide portion is a surface parallel to the X direction,
The dimension (m2) in the X direction of the tip surface is smaller than the maximum dimension (m1) in the Y direction of the guide part.
The on-off valve according to any one of claims 1 to 6. The guide part protrudes from the inner surface of the inlet part toward the center side of the inlet channel,
The outlet channel has a cylindrical shape,
The surface (32) located on the most downstream side in the fluid flow direction in the guide portion is 104 to 167% of the inner diameter (d2) of the outlet channel from the center line of the outlet channel toward the X direction. Arranged at a position separated by a length (m3) of
The on-off valve according to any one of claims 1 to 7.

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