JP6668211B2 - Valve device - Google Patents

Description

  The present invention relates to a valve device.

  BACKGROUND ART Conventionally, as a valve device (tank agitation device) attached to a submersible pump device installed in a sewage relay pump tank (water tank), for example, a valve device disclosed in Patent Document 1 has been proposed.

  Specifically, the valve device disclosed in Patent Literature 1 is provided such that an inflow portion and a discharge portion are opened in a side wall so as to face each other, and a valve housing portion is provided therein so as to communicate with the inflow portion and the discharge portion. A casing, a valve seat provided at an upstream end opening located on the valve housing side of the discharge unit, a diaphragm provided at the bottom of the valve housing, and a ball valve movably housed in the valve housing. When the valve is open, the ball valve is located at the bottom of the valve housing with the ball mounted on the diaphragm, while when the valve is closed, the diaphragm is biased upward due to the negative pressure generated in the valve housing, and the ball is displaced upward. A valve seats on the valve seat to close the discharge section.

  With such a valve device, the jet flow from the submersible pump device is transmitted from the discharge unit into the water tank through the valve device that is in an open state until a predetermined time elapses from the start (operation) of the submersible pump device. Discharge is performed, the inside of the water tank is stirred, and after a certain period of time, the valve device is closed to stop discharging the jet from the valve device.

JP 2007-255287 A

  By the way, FIG. 7 shows the flow rate of water flowing through the valve device when the submersible pump device is operated and the valve device for a conventional valve device (see the valve device 100 shown in FIG. 8) as in Patent Document 1. 5 shows a graph (curve A) showing the relationship between the valve opening state and the operation time required for switching to the valve closing state. According to this graph, in the valve device of Patent Literature 1, there was a peculiar phenomenon that the actual operation time was extremely shorter than the normally expected appropriate operation time in the predetermined flow rate range.

  In this case, in the valve device of Patent Document 1, there is a problem that an appropriate operation time is not ensured in a predetermined range in the water jet, and, for example, stirring in the sewage relay pump tank is not sufficiently performed by the valve device. Will happen.

  The present invention has been made in view of such a point, and an object of the present invention is to ensure a sufficient fluid passage time as a valve device and to secure a stable shielding ability.

  In order to achieve the above object, the inventor of the present invention has studied the operation of the valve device having the structure of Patent Document 1, and has found the following. That is, as shown in FIG. 8, in the valve device of Patent Document 1, when the jet of water introduced from the inflow portion into the valve housing portion goes to the discharge portion, the jet flow is discharged after entering the valve housing portion from the inflow portion. By flowing so as to spread outward (radially outward away from the center of the jet) near the upstream end of the part, a part of the jet collides with the inner wall surface of the valve housing near the valve seat. A part of the jet generated at the time of the collision becomes a split flow (a split flow W shown in FIG. 8) and becomes a hoisting flow which flows so as to go under the ball valve located on the diaphragm. The dynamic pressure of the fluid causes the diaphragm to be deflected. The ball valve is raised prior to operation. As a result, the ball valve will seat on the valve seat much earlier than the normally expected proper operating time.

  Therefore, the present inventors have focused on such a mechanism and completed the present invention. Specifically, a first embodiment of the present invention relates to a valve device, which is configured such that an inflow portion and an outflow portion are opened on a side wall so as to face each other, and a valve housing portion has an inflow portion and an inside therein. A casing provided to communicate with the outflow portion, a valve seat provided at an upstream end opening located on the valve housing portion side of the outflow portion, a diaphragm provided at the bottom of the valve housing portion, and a valve housing portion. A ball valve that is movably accommodated and is located at the bottom of the valve accommodating portion while being placed on the diaphragm when the valve is opened, and a ball valve that sits on a valve seat to close the outflow portion when the valve is closed. When the fluid jet flows through the valve housing toward the outlet, the negative pressure generated in the valve housing biases the diaphragm upward, thereby pushing up the ball valve and seating it on the valve seat, Now closes outflow There. The valve device has a shunt that suppresses the occurrence of a shunt in which a part of the jet flow of the fluid flowing from the inflow portion into the valve housing portion hits the inner wall surface of the valve housing portion around the valve seat and goes under the ball valve. It is characterized in that a suppressing part is provided.

  In the first embodiment, the branching suppression unit suppresses the branching of the part of the jet flowing toward the lower side of the ball valve as described above, and the branching does not accelerate the operation of closing the opening of the valve seat by the ball valve. It is possible to do so. This makes it possible to obtain an appropriate operation time as the valve device. Therefore, in the first embodiment, a sufficient fluid passage time can be secured, and a stable shielding ability can be secured.

  According to a second mode, in the first mode, the diversion suppressing portion extends along at least a part of the inner wall surface of the valve housing around the valve seat, which is located immediately upstream of the valve seat, along the circumferential direction of the valve seat. And a groove recessed toward the outside in the radial direction of the valve seat, and a part of the jet flowing into the groove is guided in a direction to return to the inflow portion side. I do.

  In the second embodiment, since a part of the jet flowing into the groove is guided in a direction to return to the inflow part side, a part of the jet does not go under the ball valve, so that an appropriate Operation time can be obtained.

  The third mode is characterized in that, in the second mode, the groove is recessed in a substantially arc-shaped cross section.

  In the third embodiment, since the groove is recessed in a substantially arcuate cross section, a part of the jet can be guided more stably and smoothly in the direction of returning to the inflow portion.

  The fourth mode is characterized in that, in the second or third mode, the groove is formed on the diaphragm side of the inner wall surface of the valve housing around the valve seat.

  In the fourth embodiment, the hoisting flow generated by colliding with at least the lower portion of the inner wall surface of the valve housing portion can be guided in the direction of returning to the inflow portion side by the groove portion.

  The fifth mode is characterized in that, in the second or third mode, the groove is formed on the entire circumference of the inner wall surface of the valve housing around the valve seat.

  In the fifth aspect, since the groove is formed on the entire circumference of the inner wall surface of the valve housing around the valve seat, it is possible to comprehensively suppress the flow of a part of the jet colliding with the inner wall of the valve housing. . Also, the apparent opening near the upstream end of the outflow part becomes wider, and the water jet flows smoothly from the inflow part to the outflow part, so the flow velocity of the jet suddenly changes near the upstream end of the outflow part Is suppressed, and the valve device can be operated stably without a sudden change in negative pressure.

  As described above, according to the present invention, a sufficient flow passage time of a fluid as a valve device can be ensured by the flow diverter, and a stable shielding ability can be secured.

FIG. 1 is a cross-sectional view illustrating an entire configuration of a sewage pump facility provided with a valve device according to an embodiment of the present invention. FIG. 2 is a plan view of the submersible pump device and the valve device. FIG. 3 is a cross-sectional view of the valve device in a valve open state. FIG. 4 is a view corresponding to FIG. 3 showing the valve device in a state where the lower diaphragm is displaced. FIG. 5 is a diagram corresponding to FIG. 3 showing the valve device in the valve closed state. FIG. 6 is a partially enlarged perspective view of the structure near the groove shown in FIG. 3 as viewed obliquely from the inflow pipe side. FIG. 7 shows the relationship between the total pump head when the submersible pump device is operated and the operation time from the open state to the closed state of the valve device when the submersible pump device is operated in the valve device according to the embodiment of the present invention. 3 is a graph shown by actual measurement values together with the valve device of FIG. FIG. 8 is a diagram corresponding to FIG. 3 showing a conventional valve device.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The description of the embodiments below is merely an example in nature, and is not intended to limit the present invention, its applications, and its uses.

  In FIG. 1, reference numeral 1 denotes a sewage relay pump tank as a water tank having an inlet 1 a and a manhole 1 b, 2 denotes a submersible pump installed in the sewage relay pump tank 1, and 10 denotes a submersible pump of the present invention used together with the submersible pump 2. This is the valve device according to the embodiment, and the valve device 10 functions as a tank stirring device. The sewage flowing from the inlet 1a into the sewage relay pump tank 1 is sucked into the submersible pump device 2 by the operation until the water level falls to a predetermined stop level when the water level becomes higher than a predetermined operation level. After being discharged from the fixed discharge pipe 6. As shown in FIG. 2, the discharge part 4 of the submersible pump device 2 is formed to protrude laterally from the pump casing 3, and a detachable connection pipe 5 is attached to this end. The other configurations of the sewage relay pump tank 1 and the submersible pump device 2 are the same as those of the related art, and thus the details thereof are omitted (see JP-A-2007-255287).

  As shown in FIGS. 3 to 5, the valve device 10 discharges part or all of the discharge flow into the tank at the start of operation of the submersible pump device 2, and each member will be described in detail below. .

(casing)
The valve device 10 includes a casing 11. The casing 11 includes a casing main body 12 made of, for example, a metal material, and a plurality of screws V (only one screw V in FIGS. (Shown), and a protective cover 32 attached and fixed on the upper side of the casing body 12.

  The lower cover portion 13 forms a bottom wall of the casing 11, and the bottom wall is formed in a convex curved shape protruding downward so as to accommodate a lower diaphragm 34 described later along the bottom wall. Around the lower surface of the lower cover 13, a plurality of legs 13b (only one leg 13b is shown in FIGS. 3 to 5) for self-standing the valve device 10 on a flat surface are provided. I have.

  In addition, a valve housing portion 14 having the lower cover portion 13 (specifically, the lower diaphragm 34) as a bottom portion is formed inside the casing body 12.

  On one side wall (the right side wall in FIGS. 3 to 5) of the casing body 12, a cylindrical inflow pipe portion 15 is integrally provided. The inflow pipe portion 15 is disposed substantially at the center in the vertical direction of the casing body 12, and introduces a jet J of water (fluid) discharged from the submersible pump device 2 into the valve housing portion 14. An inflow passage 16 as an inflow portion is opened. That is, an inflow passage 16 communicating with the valve housing 14 is formed inside the inflow pipe portion 15, and the submersible pump device 2 (pump casing 3) passes through the inflow passage 16 from the valve housing 14. The jet J flows into the air. A flange portion 15 a is formed at an upstream end of the inflow pipe portion 15, and the casing body 12 is attached to the pump casing 3 of the submersible pump device 2 by the flange portion 15 a.

  On the other side wall (left side wall in FIGS. 3 to 5) of the casing body 12, a cylindrical outflow pipe portion 17 is provided integrally at substantially the center in the vertical direction of the casing body 12. Inside the outflow pipe portion 17, an outflow passage 18 as an outflow portion through which the jet J flowing into the valve housing portion 14 from the inflow pipe portion 15 flows out of the valve housing portion 14 has the same height as the inflow passage 16. It is formed so that it may oppose in a position. A nozzle 19 having a discharge port 19a for discharging the jet J that has passed through the outflow passage 18 of the outflow pipe 17 into the sewage relay pump tank 1 is attached and fixed to the tip (downstream end) of the outflow pipe 17. Have been.

(valve seat)
A valve seat 21 is provided at an upstream end opening of the outflow pipe portion 17 located on the valve housing portion 14 side. Specifically, the valve seat 21 is formed in a circular ring shape as a separate member from the casing body 12, and the outflow passage 18 is formed such that the inner periphery thereof communicates with the outflow passage 18 of the outflow pipe portion 17. Is fixed to the casing body 12 at the position of the upstream end. The valve seat 21 is made of, for example, a material harder than the material forming the casing body 12. Further, a tapered seat surface 21a that narrows from the inflow pipe portion 15 side toward the outflow pipe portion 17 toward the radially inner side of the valve seat 21 is formed at the upstream opening edge on the inner peripheral side of the valve seat 21. Is provided.

(Ball valve)
A substantially spherical ball valve 22 is movably housed in the valve housing 14. As shown in FIG. 3, when the valve device 10 is opened, the ball valve 22 is located on the bottom of the valve accommodating portion 14 while being mounted on a lower diaphragm 34 to be described later, while as shown in FIG. When the valve is closed, the outflow pipe 17 is closed by sitting on the seat surface 21a of the valve seat 21.

(Diaphragm)
Between the casing body 12 and the lower cover portion 13, a disk-shaped lower diaphragm 34 constituting the bottom of the valve housing portion 14 is attached. The lower diaphragm 34 is made of, for example, rubber, and the lower edge of the lower portion of the casing main body 12 is hermetically sealed in a state in which a peripheral edge portion thereof is sandwiched between a lower portion of the casing main body 12 and an upper peripheral edge portion of the lower cover portion 13. It is arranged in. As shown in FIGS. 4 and 5, between the lower diaphragm 34 and the lower cover portion 13, a lower oil chamber 35 for storing oil O for inflating the lower diaphragm 34 upward is formed. ing. When a negative pressure is generated in the valve accommodating portion 14 by the jet J, the central portion is deflected upward due to a differential pressure between the negative pressure and the pressure in the lower oil chamber 35, and is located on the lower diaphragm 34. The ball valve 22 is pushed up and seated on the valve seat 21.

  Between the casing main body 12 and the protective cover 32, a similar upper diaphragm 31 is hermetically attached at a peripheral portion. Specifically, a recess 20 is formed at the top of the casing body 12, and a protection cover 32 is attached above the recess 20 to protect the upper diaphragm 31. A peripheral portion of the upper diaphragm 31 is hermetically sandwiched between the lower peripheral portion of the upper diaphragm 32 and the lower peripheral portion of the upper diaphragm 32. An upper oil chamber 33 for storing oil O (working fluid) for operating the lower diaphragm 34 is formed between the concave portion 20 of the casing main body 12 and the upper diaphragm 31.

  The lower oil chamber 35 and the upper oil chamber 33 communicate with each other through an oil passage 36 formed by the casing body 12, the lower cover 13, and the lower diaphragm 34. Due to the generation of the negative pressure, the lower diaphragm 34 is biased upward (ie, toward the valve seat 21) so as to expand, and the oil is transferred from the upper oil chamber 33 to the lower oil chamber 35 via the oil passage 36. O moves.

  Further, the lower cover 13 is provided with an adjustment valve 37 for adjusting the flow rate of the oil O moving through the oil passage 36. The adjustment valve 37 adjusts the amount of movement of the oil O between the upper oil chamber 33 and the lower oil chamber 35, and operates from the start of operation of the submersible pump device 2 until the ball valve 22 closes the outflow pipe portion 17. It is possible to adjust the time.

(Diversion control part)
Next, as a feature of the present invention, a groove 40 is provided on the inner wall surface of the valve accommodating portion 14 of the casing body 12 as a diversion suppressing portion. The groove portion 40 (the branch flow suppressing portion) hits the jet J flowing into the valve housing portion 14 from the inflow pipe portion 15, a part of which hits the inner wall surface of the valve housing portion 14 around the valve seat 21 and wraps around the lower side of the ball valve 22. The generation of a diverted stream W (see FIG. 8) that is a hoisting flow is suppressed.

  Specifically, as shown in FIGS. 3 to 6, the groove portion 40 is recessed so as to face outward in the radial direction of the valve seat 21. The groove portion 40 is disposed so as to be located immediately upstream of the valve seat 21 and has a concave shape having a substantially arc-shaped cross section. The groove portion 40 is formed over the entire circumference of the inner wall surface of the valve housing portion 14 around the valve seat 21. Due to the groove portion 40, in the valve device 10, a part of the jet J flowing into the groove portion 40 does not become the above-mentioned branch flow W (see FIG. 8) but is guided to the branch flow T (see FIG. 3). In FIG. 6, the grooves 40 are represented by dot hatching in order to emphasize the grooves 40.

(Operation of valve device)
Next, the operation of the valve device 10 will be described. As shown in FIG. 3, before starting the submersible pump device 2, the ball valve 22 is located on the bottom (lower diaphragm 34) of the valve housing portion 14, and in this state, the outflow pipe portion 17 is opened. Thus, the valve device 10 is in an open state. When the submersible pump device 2 is started in this valve open state, a part of the sewage flows from the pump casing 3 into the valve housing 14 through the inflow passage 16 of the inflow pipe 15, and flows through the outflow pipe 17. Thus, a part of the sewage is jetted from the discharge port 19 a of the nozzle 19 into the sewage relay pump tank 1. Thereby, the inside of the sewage relay pump tank 1 is stirred.

  Then, as shown in FIG. 4, the sewage passes through the valve housing 14, so that a negative pressure is generated in the valve housing 14, and this negative pressure causes the oil O to pass from the upper oil chamber 33 through the oil passage 36. To move to the lower oil chamber 35 (see the arrow shown in FIG. 4). Accordingly, the upper diaphragm 31 descends. As a result, the lower diaphragm 34 is biased so as to expand toward the valve seat 21 located above, and the ball valve 22 is pushed up toward the valve seat 21 located above the lower diaphragm 34.

  When a predetermined time (for example, about 20 to 50 seconds) elapses from the start of operation of the submersible pump device 2, the lower diaphragm 34 is completely expanded and projects upward as shown in FIG. The valve 22 is pushed up and seated on the seat surface 21a of the valve seat 21 to close the outflow passage 18 of the outflow pipe portion 17 (the discharge port 19a of the nozzle 19) (see FIG. 5). As a result, the discharge of the sewage from the nozzle 19 is stopped, and the sewage is pressure-fed to the fixed discharge pipe 6 through the discharge section 4 and the connecting / disconnecting pipe 5 (see FIGS. 1 and 2).

  Then, as shown in FIG. 5, when the pressure in the valve accommodating portion 14 increases in a state where the ball valve 22 is pressed against the valve seat 21, the lower diaphragm 34 is pushed back by the pressure, and the upper diaphragm 34 is pushed back. 31, the lower diaphragm 34 and the oil O return to their original positions (see arrows shown in FIG. 5).

  By the operation of the valve device 10, sand, sludge, floating oil, scum, etc. in the sewage relay pump tank 1 are stirred by the jet water from the nozzle 19 for a predetermined time from the start of operation of the submersible pump device 2, After being sucked into the submersible pump device 2, it is discharged from the fixed discharge pipe 6. This makes it possible to prevent sand or sludge from accumulating or accumulating in the sewage relay pump tank 1 or to prevent floating oils and scum from adhering to the walls of the sewage relay pump tank 1. It becomes possible. Further, when the sewage in the sewage relay pump tank 1 is stirred, the sewage in the vicinity of the water surface is also stirred, so that the supply of oxygen from the atmosphere is positively performed, and the aeration is promoted.

  Thereafter, when the operation of the submersible pump device 2 is stopped, the ball valve 22 separates from the valve seat 21 and falls on the lower diaphragm 34, and the submersible pump device 2 returns to the state before starting. The time from the start of operation until the ball valve 22 closes the outflow pipe 17 can be changed by adjusting the adjustment valve 37.

(Operation and effect of the embodiment)
FIG. 7 shows the flow rate of water flowing through the valve device when the submersible pump device 2 is operated and the valve device 10 in the above-described embodiment and the conventional valve device 100 from the open state to the closed state. 5 is a graph (curves A and B) showing the relationship with the operation time (hereinafter, simply referred to as “operation time”) until the transition by actual measurement values. Note that the conventional valve device 100 has the same configuration as that of Patent Document 1 described above, and as shown in FIG. 8, except for the point that the diversion suppressing portion (the groove portion 40) is not provided, the valve according to the present embodiment. The configuration is the same as that of the device 10 (in FIG. 8, the same reference numerals as those in the embodiment are used for description).

  As shown by the curve A in FIG. 7, in the conventional valve device 100, a phenomenon was observed in which the operating time was extremely short in a predetermined flow rate range, or the operating time was increased as the flow rate increased. The mechanism of this phenomenon is explained as follows.

  As shown in FIG. 8, in the conventional valve device 100, the jet J of water introduced from the inflow pipe portion 15 into the valve housing portion 14 spreads outward near the upstream end of the outflow pipe portion 17. The flow and a part of the jet J collide with the inner wall surface of the valve housing portion 14 near the valve seat 21. At this time, in particular, a part of the jet J that collides with the lower portion of the inner wall surface of the valve accommodating portion 14 becomes a branch flow W (wind-up flow) that flows so as to go under the ball valve 22 located on the lower diaphragm 34. . By the branch flow W generated by a part of the jet J, the ball valve 22 is lifted prior to the biasing operation of the lower diaphragm 34. As a result, it is assumed that the ball valve 22 comes to be seated on the valve seat 21 earlier than the original operation time.

  In particular, as shown in FIG. 7, the flow velocity of the shunt W increases at an accelerated rate within a predetermined flow rate range, and the influence of the shunt W becomes greater than the operation of the lower diaphragm 34. It is presumed that the phenomenon of shortening appears.

  As described above, in the conventional valve device 100, an appropriate operation time is not secured in a predetermined flow rate range, and for example, the stirring in the sewage relay pump tank is not sufficiently performed by the valve device 100.

  On the other hand, in the valve device 10 according to the embodiment of the present invention, a part of the jet J flowing into the valve housing portion 14 from the inflow pipe portion 15 hits the inner wall surface of the valve housing portion 14 around the valve seat 21 and the ball valve The generation of the diversion W wrapping around the lower side of the nozzle 22 is suppressed by the groove 40 (diversion suppressing part), and a part of the jet J flowing into the groove 40 is guided in the direction returning to the inflow pipe 15 side. It is configured to have a divergent stream T.

  As a result, as shown by a curve B in FIG. 7, in the valve device 10 according to this embodiment, the valve device shifts from the open state to the closed state in an appropriate operation time in a predetermined flow rate range, The phenomenon that the operation time is extremely short unlike the valve device 100 of the related art does not occur.

  That is, as supported by the curve B shown in FIG. 7, in the valve device 10 according to the embodiment of the present invention, the shunt generated by the valve device 100 of the related art is provided by providing the shunt suppressing portion including the groove 40. By suppressing W, it is possible to suppress a part of the flow of the jet J toward the lower side of the ball valve 22 and not to prematurely close the valve seat 21 by the ball valve 22. Therefore, in the valve device 10 according to the embodiment of the present invention, it is possible to obtain an appropriate operation time in a flow rate range according to the head by the submersible pump device 2, and as a result, to secure a sufficient fluid passage time. And stable shielding ability can be secured.

  Further, in the branch flow suppressing portion composed of the groove portion 40, a part of the jet J flowing into the groove portion 40 is guided in a direction returning to the inflow pipe portion 15 side. That is, the direction of the branch flow W generated in the valve device 100 of the related art is changed by the groove 40 to the branch flow T directed to the direction returning to the inflow pipe 15 side. As a result, a part of the jet J is prevented from wrapping around the lower side of the ball valve 22, and an appropriate operation time according to the lift by the submersible pump device 2 can be obtained.

  In addition, since the groove 40 is recessed in a substantially arc-shaped cross section, a part of the jet J can be guided more stably in the direction of returning to the inflow pipe 15.

  Further, in the valve device 10 according to this embodiment, the groove 40 is formed on the entire periphery of the inner wall surface of the valve housing portion 14 around the valve seat 21. For this reason, with respect to the jet J flowing from the inflow pipe portion 15 toward the valve accommodating portion 14, a part of the jet flow J that spreads outwardly reaches the groove 40 formed on the entire circumference of the inner wall surface of the valve accommodating portion 14. The collision will be uniform. Accordingly, it is possible to comprehensively suppress the flow of a part of the jet J that has collided with the inner wall surface of the valve accommodating portion 14. Further, the space of the valve housing portion 14 near the upstream end of the outflow pipe portion 17 is enlarged by the groove portion 40 formed on the entire circumference of the inner wall surface of the valve housing portion 14 and a part of the jet J and the inside of the valve housing portion 14 are formed. The point of collision with the wall surface expands outward in the valve housing part 14 as a whole. As a result, the apparent opening near the upstream end of the outflow pipe portion 17 is widened, and the jet J flows smoothly from the inflow pipe portion 15 toward the outflow pipe portion 17. Therefore, a rapid change in the flow velocity of the jet J near the upstream end of the outflow pipe portion 17 is suppressed, and the valve device 10 can be operated stably without a sudden negative pressure change.

[Other Embodiments]
Although the valve device 10 according to the above embodiment has been described as an in-tank agitator attached to the submersible pump device 2 in the sewage relay pump tank 1, it is not limited to this configuration. For example, the valve device 10 may be applied as a valve mechanism for adjusting a flow rate, a cleaning device in a tank, a sprinkler, a watering machine in a field, or the like, and a valve mechanism for shielding after a constant flow rate.

  Further, in the valve device 10 according to the above embodiment, the form in which the groove 40 is recessed in a substantially arc-shaped cross section has been described, but the present invention is not limited to this form. For example, the groove 40 may be formed in a substantially triangular cross section. In short, it is only necessary that the groove 40 be formed in a shape that can guide a part of the jet J more stably in the direction of returning to the inflow pipe 15 side.

  Further, in the valve device 10 according to the embodiment, the form in which the groove 40 is formed on the entire circumference of the inner wall surface of the valve housing 14 around the valve seat 21 has been described, but the present invention is not limited to this form. That is, the groove 40 may extend at least partially along the inner wall surface of the valve housing portion 14 around the valve seat 21 along the circumferential direction of the valve seat 21. More specifically, the groove 40 may be formed on the lower diaphragm 34 side of the inner wall surface of the valve accommodating portion 14 around the valve seat 21. In short, any form may be used as long as it can guide the branch flow W generated by colliding with the lower portion of the inner wall surface of the valve housing portion 14 by the groove portion 40 in the direction returning to the inflow pipe portion 15 side.

  Further, in the valve device 10 according to the above embodiment, the form including the groove 40 is shown as the branching suppressing part, but the present invention is not limited to this form.

  The embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the invention.

  The present invention provides a constant flow rate such as a stirring device in a tank attached to a submersible pumping device in a sewage relay pump tank, a valve mechanism for adjusting a flow rate, a washing device in a tank, a sprinkler, and a watering machine in a field. It can be used industrially as a valve mechanism that shields after performing.

1: Sewage relay pump tank 2: Submersible pump device 10: Valve device 11: Casing 12: Casing body 13: Lower cover portion 14: Valve accommodating portion 15: Inflow portion 16: Inflow passage 17: Outflow portion 18: Outflow passage 19: Nozzle 21: Valve seat 22: Ball valve 31: Upper diaphragm 32: Protective cover 33: Upper oil chamber 34: Lower diaphragm 35: Lower oil chamber 36: Oil passage 37: Adjusting valve 40: Groove (diversion suppressing part)
O: Oil J: Jet T, W: Branch

Claims (5)

A casing in which the inflow portion and the outflow portion are opened on the side wall so as to face each other, and a valve housing portion is provided therein so as to communicate with the inflow portion and the outflow portion;
A valve seat provided at an upstream end opening located on the valve housing portion side of the outflow portion,
A diaphragm provided at the bottom of the valve housing,
It is movably accommodated in the valve accommodating portion, and is located at the bottom of the valve accommodating portion while being placed on the diaphragm when the valve is opened, and is seated on the valve seat to close the outflow portion when the valve is closed. Equipped with a ball valve,
When the jet of fluid flows from the inflow portion to the outflow portion through the valve housing portion, the diaphragm is biased upward by the negative pressure generated in the valve housing portion, whereby the ball valve is moved. In a valve device which is pushed up and seated on the valve seat to close the outflow portion,
A diversion suppressing part that suppresses a part of the jet of the fluid that has flowed from the inflow part into the valve housing part into the valve housing part inner wall surface around the valve seat and from flowing under the ball valve is generated. The provided valve device. The valve device according to claim 1,
The diversion suppressing portion is formed on at least a part of an inner wall surface of the valve housing portion around the valve seat, which is located immediately upstream of the valve seat, so as to extend along a circumferential direction of the valve seat, and the valve seat is formed. A valve device comprising a groove recessed toward the outside in the radial direction, and a part of the jet flowing into the groove is guided in a direction returning to the inflow portion side. The valve device according to claim 2,
The valve device, wherein the groove is recessed in a substantially arc-shaped cross section. The valve device according to claim 2 or 3,
The valve device, wherein the groove portion is formed on the diaphragm side of an inner wall surface of the valve housing around the valve seat. The valve device according to claim 2 or 3,
The valve device, wherein the groove is formed on the entire circumference of the inner wall surface of the valve housing around the valve seat.

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