JP6048917B2 - Channel opening / closing device - Google Patents

Description

  The present invention relates to a flow path opening and closing device that starts supplying water to a toilet by receiving an instruction to start supplying water and autonomously stops supplying water by satisfying a predetermined condition.

  A so-called flash valve is known as such a channel opening / closing device. This flush valve accepts water from the primary flow path that is the water supply source and sends it to the primary internal flow path, and the flow that sends water from the secondary internal flow path to the secondary flow path that is the water supply destination. A main body formed with an outlet, a main valve (diaphragm valve) for opening and closing the flow path between the primary side internal flow path and the secondary side internal flow path, and the primary side internal flow path without going through the main valve And a secondary passage (relief valve) for opening and closing the bypass passage (see, for example, Patent Document 1 below).

  When the flush valve configured as described above performs an operation of opening the sub-valve such as depressing the operation lever, the bypass passage is opened and the back pressure of the main valve body constituting the main valve is reduced, and the primary side internal flow is reduced. The main valve body is pushed up by the primary pressure in the passage so as to be separated from the main valve seat, the main valve is opened, and water flows out from the outlet to the secondary side flow path. Thereafter, when the sub valve is closed such as returning the operation lever, or when the operation lever is automatically returned and the sub valve is closed, the bypass flow path is closed and the back pressure of the main valve body increases. As the back pressure of the main valve body increases, the main valve body descends so as to approach the main valve seat, and the main valve closes as the main valve body comes into contact with the main valve seat. Therefore, the flush valve functions as a flow path opening / closing device that starts water supply to the toilet upon receiving an instruction to start water supply and autonomously stops water supply when a predetermined condition is satisfied.

  A conventional flush valve is extremely useful as a device for delivering a certain amount of water with a relatively simple configuration, and is widely used as a means for supplying water to a urinal or a urinal. However, due to the structure of the conventional flush valve, it is difficult to strictly control the water volume. According to the Japanese Industrial Standard, the standard water discharge is 15L, and the water discharge is 11 ~ 16.5L if the water pressure is low. If possible, it is allowed, and if the water pressure is high, it is allowed if a water discharge amount of 13.5 to 19 L can be secured.

  As described above, the conventional flush valve has a different amount of water discharge due to fluctuations in water pressure. In addition, in a public space or the like, a plurality of toilets are generally installed in a form of being connected to each other. There is a problem that the water pressure fluctuation is more greatly generated depending on the case. For this reason, the conventional flush valve toilet has a configuration in which the amount of water is increased so that filth can be discharged properly even when the water pressure is low or the water pressure fluctuation is large. Therefore, particularly when the water pressure is high or in an environment where fluctuations in the water pressure are small, excess water must be flowed. As a result, there is a great amount of wasted water, and a countermeasure in terms of water saving has been desired.

  Therefore, a so-called constant flow valve is incorporated in the flash valve, and even if the water pressure fluctuates in a high water pressure environment or in the primary side flow path, waste water is eliminated by keeping the flow rate of water sent to the secondary side flow path constant. A proposal intended to enhance performance has been made (see Patent Document 2 below).

JP 2006-170382 A JP 2000-282537 A

  The conventional technique described in Patent Document 2 incorporates a constant flow valve afterward into a flash valve that can be operated without incorporating a constant flow valve. Each functional member of the conventional normal flash valve is based on the premise that the differential pressure between the primary pressure of the primary flow path and the secondary pressure of the secondary flow path is relatively large. Therefore, when a constant flow valve is installed as a retrofit, the differential pressure between the primary pressure and the secondary pressure becomes small, so although the effect of making the flow rate constant can be expected to some extent, the opening and closing response of the main valve becomes dull. there is a possibility. In particular, more reliable constant flow rate control is required to achieve water saving in the entire toilet bowl cleaning system including the flow path opening / closing device. In addition, when a constant flow valve is incorporated as a retrofit, it is a matter of course that a constant flow valve is added to the structure of a conventional normal flash valve, which makes it difficult to reduce the overall size of the apparatus. is there.

  Therefore, the present inventors are a channel opening and closing device that starts supplying water to a toilet by receiving an instruction to start water supply, and autonomously stops water supply by satisfying a predetermined condition. The present inventors have studied to provide a flow path opening / closing device that can quickly open and close the main valve for starting and stopping water supply and can be downsized while keeping constant.

  As a result of this examination, the present inventors incorporated a constant flow rate means that operates so as to keep the main flow rate flowing from the primary side internal flow path to the secondary side internal flow path constant in the main valve. The constant flow means has a constant flow valve body and a constant flow valve seat, and operates to adjust the distance between the constant flow valve body and the constant flow valve seat. Are formed as an integrated valve member. By configuring in this way, a flow path opening / closing device that can quickly open and close a main valve for starting and stopping water supply while keeping the instantaneous flow rate of water supply constant is provided. However, new challenges were discovered in this process.

  This is particularly noticeable when a relatively large flow rate of water is caused to flow by this flow path opening and closing device, and pulsation of a flow rate that does not occur when a relatively small flow rate of water is caused to occur. . In order to achieve a constant flow rate with higher accuracy, it is preferable to supply a stable water flow while suppressing pulsation of such a flow rate even when a relatively high flow rate of water is flowed.

  This invention is made in view of such a subject, The objective starts water supply to a toilet bowl by receiving the instruction | indication which starts water supply, and stops water supply autonomously by satisfy | filling a predetermined condition. It is a flow path opening and closing device that can quickly open and close the main valve for starting and stopping the water supply while keeping the instantaneous flow rate of the water supply constant, and can be downsized and a relatively large flow rate. An object of the present invention is to provide a flow path opening / closing device capable of suppressing the pulsation of the flow rate even in the case of flowing water.

  In order to solve the above problems, a flow path opening / closing apparatus according to the present invention starts a water supply to a toilet by receiving an instruction to start water supply, and automatically stops the water supply by satisfying a predetermined condition An inlet that receives water from a primary flow path that is a water supply source and sends it to a primary internal flow path, and a flow that sends water from a secondary internal flow path to a secondary flow path that is a water supply destination And a main valve having a main valve body and a main valve seat for opening and closing a flow path between the primary side internal flow path and the secondary side internal flow path, and the main valve. A bypass passage that communicates the primary side internal flow path and the secondary side internal flow path without being interposed between the main valve body, a sub valve that opens and closes the bypass flow path, and the sub valve When the valve is opened, the back pressure of the main valve body is reduced, the main valve is opened, and the primary side internal flow When the sub valve is closed after water flows from the secondary side internal flow path to the secondary side internal flow path, the back pressure of the main valve body rises to balance with the primary pressure in the primary side internal flow path. Delay means for maintaining the main valve in an open state and delaying the closing of the main valve. The main valve incorporates constant flow means that operates to keep a main flow rate flowing from the primary side internal flow path to the secondary side internal flow path constant, and the constant flow means has an inclined surface. The constant flow valve body and the constant flow valve seat, and operate to adjust the distance between the constant flow valve body and the constant flow valve seat, the main valve body and the constant flow valve body, Is formed as an integrated valve member, and pulsation suppressing means for suppressing the pulsation of the valve member due to the pulsation of the primary pressure is provided.

  According to the flow path opening and closing device according to the present invention, the constant flow valve body and the constant flow valve seat are incorporated in the main valve, and by adjusting the distance between the constant flow valve body and the constant flow valve seat, The main flow rate flowing from the flow path to the secondary side internal flow path is kept constant. Since the main valve body and the constant flow valve body are formed as an integrated valve member, when the valve member is driven, the main valve body and the constant flow valve body move integrally. Since the flow rate can be adjusted simultaneously by driving the main valve body in this way, a large differential pressure between the primary pressure and the secondary pressure can be obtained, and the main valve body can be opened and closed quickly. Can do. Therefore, it is possible to provide a flow path opening / closing device that can quickly open and close the main valve for starting and stopping water supply and that can be downsized.

  Further, since the pulsation suppressing means for suppressing the pulsation of the valve member due to the pulsation of the primary pressure is provided, the valve member is stably present at a predetermined position even when a relatively large flow of water is allowed to flow. Since it is possible to continue, the distance between the constant flow valve body and the constant flow valve seat is not affected by the pulsation of the primary pressure, and the pulsation of the flow rate can be suppressed.

  In the flow path opening and closing device according to the present invention, the valve member has a pressure receiving surface that receives the primary pressure, and is configured to advance and retreat according to the pressure received by the pressure receiving surface. It is also preferable that a damping mechanism having a flow path cross-sectional area is provided so as to attenuate the pulsation of the primary pressure between the primary side internal flow path and the pressure receiving surface.

  In this preferred embodiment, the valve member has a pressure receiving surface that receives the primary pressure in the primary side internal flow path, and is configured to advance and retreat according to the pressure received by the pressure receiving surface. By controlling, the valve member can be reliably kept in a predetermined position. A damping mechanism with a reduced channel cross-sectional area is provided so as to attenuate the pulsation of the primary pressure between the primary-side internal channel and the pressure-receiving surface. The influence of the pressure fluctuation which is received can be suppressed to the minimum.

  In the flow path opening / closing apparatus according to the present invention, water flowing into the valve member from the primary side internal flow path is introduced so as to be orthogonal to the advancing / retreating direction of the valve member, and the pressure receiving surface is in the advancing / retreating direction. It is also preferable that they are formed so as to face each other.

  In this preferred embodiment, the water flowing into the valve member from the primary side internal flow passage is introduced so as to be orthogonal to the advance / retreat direction of the valve member, and the pressure receiving surface is formed to face the advance / retreat direction. It is possible to make the pressure receiving surface less susceptible to the influence of pressure fluctuations.

  In the flow path opening / closing apparatus according to the present invention, a spring is arranged so that a force balanced with a force applied by the primary pressure in the primary side internal flow path is applied to the main valve body, and the main valve body is acted on by the action of the spring. The degree of opening of the main valve seat with respect to the primary pressure is adjusted according to the primary pressure, and the spring is at least as long as the secondary valve is closed from the primary side internal flow path to the secondary side. The water flowing into the internal flow path does not pass, but the water flowing in from the primary side internal flow path is accumulated so that the primary pressure acts in a direction to push the main valve body toward the main valve seat. It is also preferable that it is disposed in the back pressure chamber.

  According to this preferred aspect, the spring is arranged in the back pressure chamber formed so that water flowing from the primary side internal flow path to the secondary side internal flow path does not pass at least while the sub valve is closed. Therefore, the spring is not affected by the flow, and even if pulsation occurs in the flow, it is possible to reliably reduce the influence on the position control of the main valve body.

  In the flow path opening / closing apparatus according to the present invention, the delay means includes a hole communicating the primary side internal flow path and the back pressure chamber, and water passes through the hole to reduce the back pressure of the main valve body. It is preferable that the water is raised so as to balance with the primary pressure in the primary side internal flow path, and the water that has passed through the hole flows into the back pressure chamber so as to be orthogonal to the expansion and contraction direction of the spring.

  According to this preferred aspect, the water increases the back pressure of the main valve body so as to be balanced with the primary pressure by allowing water to pass through the hole communicating the primary side internal flow path and the back pressure chamber. Even if it occurs, it can be attenuated by the hole, so that the back pressure of the main valve body is not greatly affected. Furthermore, since the water that has passed through the hole flows into the back pressure chamber so as to be orthogonal to the expansion and contraction direction of the spring, stable constant flow rate control can be performed without affecting the expansion and contraction of the spring.

  In the flow path opening and closing device according to the present invention, the valve member has a pressure receiving surface that receives the primary pressure, and is configured to advance and retreat according to the pressure received by the pressure receiving surface. A slow member interposed between the inner wall of the main body is provided so as to reduce the influence of the movement of the valve member from the pulsation of the primary pressure, and to slow down the movement of the valve member. Is also preferable.

  In this preferred embodiment, the valve member has a pressure receiving surface that receives the primary pressure in the primary side internal flow path, and is configured to advance and retreat according to the pressure received by the pressure receiving surface. By controlling, the valve member can be reliably kept in a predetermined position. As a pulsation suppression means, a slow member interposed between the inner wall of the main body portion is provided so as to reduce the influence of the movement of the valve member from the pulsation of the primary pressure, so as to slow down the movement of the valve member. Therefore, the influence of the pressure fluctuation applied to the valve member can be suppressed to a minimum with a simple configuration in which a slow member such as a rubber ring that increases friction is disposed.

  According to the present invention, a flow path opening and closing device that starts water supply to a toilet upon receiving an instruction to start water supply and autonomously stops water supply when a predetermined condition is satisfied, and the instantaneous flow rate of water supply is constant. In addition, the main valve for starting and stopping the water supply can be quickly opened and closed, the size can be reduced, and the pulsation of the flow rate is suppressed even when a relatively large amount of water is passed. It is possible to provide a flow path opening / closing device that can be used.

It is an external view which shows the state which attached the flush valve which is embodiment of this invention to the water supply pipe to a toilet bowl. It is a schematic block diagram which shows typically the internal structure of the flash valve which is embodiment of this invention. It is a figure which shows the water discharging operation | movement of the flash valve shown in FIG. It is a figure which shows the relationship between the lift amount and water pressure at the time of flowing a fixed flow volume in the conventional flow regulating valve body. It is a figure which shows the relationship between a lift amount (expansion / contraction amount) and water pressure when water pressure is applied with respect to a spring. It is a figure explaining the point of balance | balance of force when the force which the flow regulating valve body of the characteristic shown in FIG. 4 tries to open is supported by the spring of the characteristic shown in FIG. FIG. 6 is a diagram showing the relationship between the supply water pressure and the amount of flowing water when the force to open the flow regulating valve body having the characteristics shown in FIG. 4 is supported by the spring having the characteristics shown in FIG. 5. In the constant flow valve body of this embodiment, it is a figure which shows the relationship between the lift amount and water pressure at the time of flowing a fixed flow rate. It is a figure explaining the point of balance of force at the time of supporting the force which the constant flow valve body of the characteristic shown in FIG. 8 tries to open with the spring of the characteristic shown in FIG. It is a figure which shows the relationship between a water supply pressure and the amount of flowing water when the force which the constant flow valve body of the characteristic shown in FIG. 8 tries to open is supported by the spring of the characteristic shown in FIG. It is a perspective view which shows an example of the constant flow valve body which has a characteristic as shown in FIG. It is a figure which shows the water discharge characteristic of the flash valve shown in FIG. It is a figure which shows the water discharge characteristic at the time of moving the outlet of a bypass flow path with respect to the flash valve shown in FIG. FIG. 3 is a schematic diagram showing a first modification of the flash valve shown in FIG. 2, schematically showing a state in which a constant flow valve is installed separately on the upstream side. It is a figure which shows the water discharge characteristic of the flash valve shown in FIG. It is a figure which shows the water discharge characteristic at the time of attaching a constant flow valve to the downstream as a separate body with respect to the flash valve shown in FIG. It is a block diagram which shows an example at the time of actually configuring the flash valve shown in FIG. It is a figure which shows the AA cross section of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In order to facilitate the understanding of the description, the same constituent elements in the drawings will be denoted by the same reference numerals as much as possible, and redundant description will be omitted.

  FIG. 1 shows a flash valve (flow path opening / closing device) according to an embodiment of the present invention. FIG. 1 is an external view showing a state in which a flush valve according to an embodiment of the present invention is attached to a water supply pipe to a toilet. As shown in FIG. 1, the flash valve SV (flow path opening / closing device) is attached in the middle of the water supply pipe TB to the toilet bowl SB. Upon receiving an instruction to start water supply, the flash valve SV opens a flow path through the water supply pipe TB and starts water supply to the toilet SB. Thereafter, the flush valve SV autonomously closes the flow path and stops water supply by satisfying a predetermined condition (details will be described later).

  Next, the internal structure of the flash valve SV according to the embodiment of the present invention will be described with reference to FIG. FIG. 2 is a schematic configuration diagram schematically showing the internal structure of the flash valve SV.

  As shown in FIG. 2, the flash valve SV includes a main body 10. Inside the main body 10, there are a primary side internal flow path 20, a secondary side internal flow path 30, a first back pressure chamber 16 (back pressure chamber), and a second back pressure chamber 14 (back pressure chamber). The auxiliary back pressure chamber 12 is formed. The primary side internal flow path 20 receives inflow water Wa from the primary side flow path (flow path upstream of the flush valve SV of the water supply pipe TB shown in FIG. 1) that is a water supply source, and receives the secondary side internal flow path. It flows out toward 30. An inlet 21 is provided at the upstream end of the primary side internal flow path 20. The inflow port 21 is an opening that receives the incoming water Wa and sends it out to the primary side internal flow path 20.

  The secondary-side internal flow path 30 converts the water flowing from the primary-side internal flow path 20 into a secondary-side flow path (a flow path downstream of the flush valve SV of the water supply tube TB shown in FIG. 1). This is to be discharged as the outflow water Wb. An outlet 31 is provided at the downstream end of the secondary side internal flow path 30. The outflow port 31 is an opening that sends out the effluent water Wb from the secondary side internal flow path 30 to the secondary side flow path.

  Between the primary side internal flow path 20 and the secondary side internal flow path 30, the valve which has the main valve body 42 which opens and closes the flow path between the primary side internal flow path 20 and the secondary side internal flow path 30 A member 40 is arranged. The valve member 40 is arranged such that one end on the downstream side is inserted into the secondary side internal flow path 30 and the other end on the opposite side faces the second back pressure chamber 14. The valve member 40 is disposed so as to advance and retract along the direction in which the secondary-side internal flow path 30 extends.

  A downstream surface of the main valve body 42 is a main valve body surface 421. When the valve member 40 is pushed most downstream, the main valve body surface 421 contacts the boundary surface of the primary side internal flow path 20 with respect to the secondary side internal flow path 30, and the primary side internal flow path 20 and the secondary side internal flow It is configured to block the flow of water to and from the passage 30. Therefore, the boundary surface with which the main valve body surface 421 abuts functions as the main valve seat surface 201 (main valve seat).

  A constant flow valve body 44 (constant flow means) is provided on the downstream side of the main valve body 42 of the valve member 40. The constant flow valve body 44 has an inclined surface 441 (outer surface) and a valve-side protrusion 442 (guide portion, stabilizing means). The valve-side protrusion 442 is provided so as to contact the side wall of the secondary-side internal flow path 30. A plurality of valve-side protrusions 442 are provided so as to surround the cross-section of the flow path so as to contact the inner wall of the secondary-side internal flow path 30 having a substantially circular cross section at different positions. Accordingly, the valve member 40 slides so as to be able to advance and retreat while the valve-side protrusion 442 abuts against the inner wall of the secondary-side internal flow path 30, so that the valve member 40 can stably slide without tilting.

  The inclined surface 441 of the constant flow valve body 44 makes the inner wall of the secondary internal flow path 30 a constant flow valve seat by making the distance between the inclined wall 441 and the inner wall of the secondary internal flow path 30 variable. Consists of a constant flow valve. The inclined surface 441 is formed to be inclined from the main valve body 42 toward the outlet 31 so as to be separated from the inner wall of the secondary side internal flow path 30.

  Accordingly, when the valve member 40 is lifted so as to pass water between the primary side internal flow path 20 and the secondary side internal flow path 30 (in the direction of entering the first back pressure chamber 16), the constant flow valve body 44 The shortest distance between the inclined surface 441 and the inner side wall of the secondary side internal flow path 30 increases, and acts to increase the flow rate. The valve member 40 rises (direction to enter the first back pressure chamber 16) so as to pass water between the primary side internal flow path 20 and the secondary side internal flow path 30, and then descends (towards the outlet 31). Direction), the shortest distance between the inclined surface 441 of the constant flow valve body 44 and the inner wall of the secondary side internal flow path 30 is reduced, and the flow rate is reduced.

  An accommodation recess 46 is provided on the opposite side of the valve member 40 to the constant flow valve body 44 with the main valve body 42 interposed therebetween. The housing recess 46 is formed in a concave shape so as to recede from the first back pressure chamber 16 side. A C-ring 48 is provided at the end of the accommodation recess 46 on the first back pressure chamber 16 side. The C ring 48 is provided so as to abut against the inner wall of the main body 10 on the secondary side internal flow path 30 side than the first back pressure chamber 16.

  Therefore, the valve member 40 has the valve-side protrusion 442 in contact with the inner wall of the secondary side internal flow path 30 on one end side, and the C ring 48 in contact with the inner wall of the main body 10 on the other end side. As described above, the valve member 40 is configured to slide while being held so as not to be inclined between the one end side and the other end side.

  A narrowing portion 161 is provided between the C ring 48 and the main valve body 42 so as to protrude from the inner wall of the main body portion 10. A gap is formed between the throttle 161 and the accommodation recess 46, and the gap serves as a throttle channel 162. Accordingly, the intermediate chamber 18 between the accommodation recess 46 and the inner wall of the main body 10 is configured such that water flows from the primary side internal flow path 20 through the throttle flow path 162 in a state where the speed is reduced. ing.

  A hole 462 for connecting the intermediate chamber 18 and the first back pressure chamber 16 is formed in the housing recess 46. Therefore, the water that has entered the intermediate chamber 18 from the primary side internal flow path 20 flows through the hole 462 to the first back pressure chamber 16.

  The first back pressure chamber 16 and the second back pressure chamber 14 are separated by a partition wall 19. The partition wall 19 is provided with a recess 191. The recess 191 is formed as a recess in which the outer wall protrudes from the second back pressure chamber 14 toward the first back pressure chamber 16. A spring 70 (constant flow rate means) having linear characteristics is disposed on the second back pressure chamber 14 side of the recess 191. One end of the spring 70 is accommodated in the recess 191, and the other end is disposed so as to contact the wall member 60 that partitions the auxiliary back pressure chamber 12 and the second back pressure chamber 14.

  The bottom surface of the recess 191 (the surface that protrudes most to the first back pressure chamber 16 side) is formed so that the rod-shaped position control member 50 penetrates between the bottom surface of the recess 191 and the position control member 50. A gap is formed to form a throttle 192. Accordingly, the water that has entered the intermediate chamber 18 from the primary side internal flow path 20 flows through the hole 462 to the first back pressure chamber 16, and flows through the throttle portion 192 to the second back pressure chamber 14.

  The position control member 50 is disposed so as to penetrate the center of the winding of the spring 70. One end of the position control member 50 is disposed so as to abut against or separate from the bottom surface of the housing recess 46 in the valve member 40, and the other end of the position control member 50 is fixed to the wall member 60.

  The housing recess 46 is configured such that when the valve member 40 approaches the partition wall 19, the recess 191 of the partition wall 19 is housed therein. A space 464 is formed between the housing recess 46 and the recess 191, and when the space 464 is filled with water, the behavior of the housing recess 46 with respect to the recess 191 is reduced, and the behavior of the valve member 40 is stable. To do.

  The wall member 60 includes a lower wall member 602, a C ring 604, and an upper wall member 606. The lower wall member 602 is a wall facing the second back pressure chamber 14. The upper wall member 606 is a wall facing the auxiliary back pressure chamber 12. The C ring 604 is held between the lower wall member 602 and the upper wall member 606. The C ring 604 is disposed so as to be in close contact with the inner wall of the main body 10 between the auxiliary back pressure chamber 12 and the second back pressure chamber 14. The C ring 604 is a C-shaped member whose one end and the other end are not fixed, and is formed of a resin or the like. Is possible.

  The wall member 60 slides so as to widen the auxiliary back pressure chamber 12 (narrow the second back pressure chamber 14) or to reduce the auxiliary back pressure chamber 12 by the pressure difference between the auxiliary back pressure chamber 12 and the second back pressure chamber 14. It is configured to slide so as to narrow the chamber 12 (expand the second back pressure chamber 14). Since the position control member 50 is fixed to the lower wall member 602 of the wall member 60, the position control member 50 is also moved by the sliding of the wall member 60.

  The auxiliary back pressure chamber 12 is configured so that the same pressure as the primary pressure applied to the primary side internal flow path 20 is applied. Specifically, the primary side internal flow path 20 and the auxiliary back pressure chamber 12 are connected by the auxiliary primary flow path 22, and the primary pressure is transmitted to the auxiliary back pressure chamber 12. In the middle of the sub-primary flow path 22, a throttle part 222 (pulsation suppressing means, damping mechanism) for reducing the cross-sectional area of the sub-primary flow path 22 is provided. The secondary primary flow path 22 is connected to the secondary back pressure chamber 12 through a hole 122 formed in the side wall of the secondary back pressure chamber 12. Accordingly, the surface of the wall member 60 on the side of the auxiliary back pressure chamber 12 functions as a pressure receiving surface 607 that receives the primary pressure.

  The second back pressure chamber 14 and the secondary side internal flow path 30 are connected by a bypass flow path 80. A sub valve 82 is provided in the bypass flow path 80. If the sub-valve 82 is closed and the first back pressure chamber 16 to the second back pressure chamber 14 are filled with water, the primary pressure inside the first back pressure chamber 16 and the second back pressure chamber 14 Is on. On the other hand, when the sub valve 82 is opened, the water in the first back pressure chamber 16 and the second back pressure chamber 14 flows out from the bypass flow path 80 to the secondary side internal flow path 30, and the first back pressure chamber 16 and the second back pressure chamber 16. The internal pressure of the two back pressure chambers 14 decreases.

  Next, the operation of the flash valve SV will be described with reference to FIG. FIG. 3 is a diagram showing a water discharge operation of the flash valve SV shown in FIG. 3A shows a state before water discharge, FIG. 3B shows a state where the sub valve 82 is opened, and FIG. 3C shows a state where water is discharged while adjusting the flow rate. ing.

  As shown in FIG. 3A, when the sub valve 82 is closed, the first back pressure chamber 16, the second back pressure chamber 14, and the sub back pressure chamber 12 have primary primary flow paths. The same primary pressure as 20 is applied. The main valve body 42 of the valve member 40 is also pushed into the outlet 31 side by the primary pressure, and the main valve body 42 comes into close contact with the boundary surface between the primary side internal flow path 20 and the secondary side internal flow path 30 to stop water. Has been.

  Subsequently, as shown in FIG. 3B, when the sub valve 82 is opened, first, the water in the second back pressure chamber 14 flows out. This is because the water flow between the second back pressure chamber 16 and the first back pressure chamber 14 is performed via the throttle portion 192. This is because the throttle 192 is a narrow gap, so that the flow rate of water flowing through the bypass flow path 80 is faster, and the water in the first back pressure chamber 16 is sent to the second back pressure chamber 14.

  When the water in the second back pressure chamber 14 flows out, the pressure in the second back pressure chamber 14 decreases. Since the pressure difference between the second back pressure chamber 14 and the auxiliary back pressure chamber 12 is generated, the wall member 60 is pushed down. Since the wall member 60 and the position control member 50 are fixed, the position control member 50 is also pushed down. Since the spring 70 is disposed between the wall member 60 and the partition wall 19, when the wall member 60 is pushed down, the spring 70 contracts to generate a reaction force. The amount by which the wall member 60 and the position control member 50 approach the valve member 40 is determined by the balance between the force by which the wall member 60 is pushed by the primary pressure and the force that the spring 70 tries to counter.

  When the wall member 60 and the position control member 50 are pushed down to the valve member 40 in this way, the water in the first back pressure chamber 16 also flows out as shown in FIG. The first back pressure chamber 16 and the second back pressure chamber 14 are pushed up. Since the main valve body 42 (main valve body surface 421) of the valve member 40 is detached from the main valve seat surface 201, water flows from the primary side internal flow path 20 to the secondary side internal flow path 30. The flow rate of water flowing from the primary side internal flow path 20 to the secondary side internal flow path 30 is adjusted by the size of the gap between the constant flow valve body 44 and the secondary side internal flow path 30.

  Thereafter, when the sub valve 82 is closed, the first back pressure chamber 16 and the second back pressure chamber 162 (see FIG. 2), the hole 462 (see FIG. 2), the throttling portion 192 (see FIG. 2) are passed through. The water accumulates in the back pressure chamber 14, and eventually the first back pressure chamber 16 and the second back pressure chamber 14 are filled with water and the primary pressure is applied, whereby the valve member 40 is pushed down, and the main valve The body 42 (main valve body surface 421) abuts on the main valve seat surface 201 to stop water.

  By the way, in the flash valve SV of the present embodiment, constant flow control is easily performed by devising the form of the constant flow valve body 44. The device of the form of the constant flow valve body 44 will be described with reference to FIGS. FIG. 4 is a diagram showing the relationship between the lift amount and the water pressure when a constant flow rate is passed in a conventional flow rate adjusting valve body. FIG. 5 is a diagram illustrating the relationship between the lift amount (expansion / contraction amount) and the water pressure when water pressure is applied to the spring. FIG. 6 is a diagram for explaining a point at which the force is balanced when the force to open the flow regulating valve body having the characteristics shown in FIG. 4 is supported by the spring having the characteristics shown in FIG. FIG. 7 is a diagram showing the relationship between the water supply pressure and the amount of flowing water when the force to open the flow regulating valve body having the characteristics shown in FIG. 4 is supported by the spring having the characteristics shown in FIG. FIG. 8 is a diagram illustrating the relationship between the lift amount and the water pressure when a constant flow rate is allowed to flow in the constant flow valve body of the present embodiment. FIG. 9 is a diagram for explaining the point of balance of force when the force to open the constant flow valve body having the characteristics shown in FIG. 8 is supported by the spring having the characteristics shown in FIG. FIG. 10 is a diagram showing the relationship between the water supply pressure and the amount of flowing water when the force to open the constant flow valve body having the characteristics shown in FIG. 8 is supported by the spring having the characteristics shown in FIG. FIG. 11 is a perspective view showing an example of a constant flow valve body having characteristics as shown in FIG.

  As a conventional flow rate adjusting valve body used as a comparative example, a valve that also performs flow rate adjustment by a valve having a water stop function (a valve corresponding to the main valve body 42 and the main valve seat surface 201 in this embodiment) is adopted. ing. The valve having such a water stop function is to advance and retract the flat valve body with respect to the flat seat surface, and the seat surface and the valve body flow between them while maintaining a parallel state to each other. The flow rate is adjusted. When such a flow rate adjusting valve body is used, the relationship between the lift amount and the water pressure for maintaining the flowing flow rate at 40 L / min, 60 L / min, and 80 L / min is a non-linear characteristic as shown in FIG. It will have. On the other hand, when a spring having a normal linear characteristic is used, the relationship with the lift amount (expansion / contraction amount) when water pressure is applied to the spring has a linear characteristic as shown in FIG. .

  Using a conventional flow rate adjusting valve having the characteristics shown in FIG. 4 and a spring having the characteristics shown in FIG. 5, a spring force is generated against the force that the flow rate adjusting valve tries to open. If arranged in this way, the point where the two are kept in balance is the point where the characteristic shown in FIG. 4 and the characteristic shown in FIG. Therefore, if the feed water pressure fluctuates, the flow rate fluctuates, and constant flow control cannot be performed as shown in FIG.

  On the other hand, the constant flow valve body 44 of the present embodiment has characteristics as shown in FIG. 8 so that many points that maintain equilibrium with the springs having characteristics as shown in FIG. 5 are generated. FIG. 8A shows the relationship between the lift amount and the water pressure for maintaining the flowing flow rate at 40 L / min, 60 L / min, and 80 L / min when the constant flow valve body 44 is used. It is shown. As shown in FIG. 8A, the relationship between the lift amount and the water pressure has a linear characteristic at each flow rate. When this characteristic is converted into the relationship between the lift amount and the instantaneous flow rate, as shown in FIG. 8B, when the lift amount increases, the instantaneous flow rate increases in a quadratic curve.

  As described with reference to FIGS. 2 and 3, the constant flow valve body 44 is opened using the constant flow valve body 44 as shown in FIG. 8 and the spring having the characteristics as shown in FIG. For example, when the flow rate is 60 L / min, the characteristics are such that the two substantially overlap each other. When a spring having a linear characteristic that matches the characteristic of the flow rate desired to flow is used, constant flow rate control can be performed in which the flow rate does not vary even when the feed water pressure varies, as shown in FIG.

  Specifically, an example of what form the constant flow valve body 44 can take is shown in FIG. As shown in FIG. 11, the inclined surface 441 (outer surface) of the constant flow valve body 44 has a secondary internal flow as a constant flow valve seat arranged around the downstream side (downward in the figure). The distance from the inner wall of the path 30 is increased. With such a shape, the opening area changes non-linearly with respect to the lift amount of the constant flow valve body 44 (amount of movement in the vertical direction in the figure), and the relationship between the lift amount and the instantaneous flow rate flowing through the gap. Can be as illustrated in FIG. 8B. Therefore, in other words, it can have characteristics as shown in FIG.

  In the flash valve SV according to the present embodiment, the bypass flow path 80 connects the second back pressure chamber 14 and the secondary side internal flow path 30. By connecting the second back pressure chamber 14 and the secondary side internal flow path 30 in this manner, the water in the second back pressure chamber 14 is first discharged as described above, and the position control member 50 is brought to the primary pressure. The valve member 40 is lowered to a corresponding position, and the rapid behavior of the valve member 40 is suppressed. With this configuration, as shown in FIG. 12, the water discharge flow rate increases from the water discharge start time t1 to the time t1a, and the water discharge at a constant flow rate is performed from the time t2 to the water discharge end time t2a. The water discharge gradually decreases and the water stops.

  On the other hand, for comparison, an example in which the bypass flow path 80 is connected to the first back pressure chamber 16 and the secondary side internal flow path 30 is shown in FIG. If it connects in this way, the effect of the device which divided | segmented the back pressure chamber into the 1st back pressure chamber 16 and the 2nd back pressure chamber 14 as mentioned above, and produced | generated the buffer effect will be lose | eliminated. As shown in FIG. 13, after the water discharge flow rate suddenly increases and overshoots from the water discharge start time t1 to time t1b and then decreases, the water discharge at a constant flow rate is performed from time t2 to the water discharge end time t2b. The water discharge rate gradually decreases until the water stops.

  The flush valve SV of the present embodiment described above receives the inflow water Wa from the primary side flow path that is the water supply source and sends it to the primary side internal flow path 20, and the secondary side internal flow path 30 at the water supply destination. The main body 10 is provided with an outlet 31 for sending out the effluent water Wb to a certain secondary channel. Inside the main body 10, there are a main valve body 42 (main valve body surface 421) and a main valve seat surface 201 (main valve) for opening and closing the flow path between the primary side internal flow path 20 and the secondary side internal flow path 30. Seat), a spring 70 (constant flow rate means), and a position control member 50 are arranged to constitute a main valve. Further, the flush valve SV opens and closes the bypass channel 80 that connects the primary side internal channel 20 and the secondary side internal channel 30 without going through the region that functions as the main valve, and the channel of the bypass channel 80. And a sub valve 82.

  Further, in the flush valve SV, when the sub valve 82 is opened, the back pressure of the main valve body 42 is lowered, the main valve is opened, and water flows from the primary side internal flow path 20 to the secondary side internal flow path 30. When the sub-valve 82 is closed later, the main valve is maintained in an open state until the back pressure of the main valve body 42 rises so as to balance with the primary pressure in the primary-side internal flow path 20, and the main valve is closed. Is configured to delay. As a delay means for delaying the closing of the main valve in this way, a throttle part 161, a throttle channel 162, a hole 462, and a throttle part 192 are provided.

  The main valve incorporates constant flow means that operates so as to keep the main flow rate flowing from the primary side internal flow path 20 to the secondary side internal flow path 30 constant. The constant flow means functions as the constant flow valve body 44 and the inner wall of the secondary internal flow path 30 as the constant flow valve seat, and the secondary flow as the constant flow valve body 44 and the constant flow valve seat. A spring 70, a position control member 50, and a wall member 60 that operate so as to adjust the distance from the inner wall of the side internal flow path 30 are also included. The main valve body 42 and the constant flow valve body 44 are formed as an integrated valve member 40.

  According to the flush valve SV according to the present embodiment, the constant flow valve body 44 and the inner side wall of the secondary internal flow passage 30 functioning as a constant flow valve seat are incorporated in the portion functioning as the main valve, and the constant flow valve By adjusting the distance between the body 44 and the constant flow valve seat, the main flow rate flowing from the primary side internal flow path 20 to the secondary side internal flow path 30 is kept constant. Since the main valve body 42 and the constant flow valve body 44 are formed as an integrated valve member 40, when the valve member 40 is driven as described above, the main valve body 42 and the constant flow valve body 44 are integrally formed. Moving. As described above, since the flow rate can be adjusted simultaneously by driving the main valve body 42, a large differential pressure between the primary pressure and the secondary pressure can be obtained, and the opening and closing operation of the main valve body 42 can be performed quickly. It can be carried out. Therefore, the main valve for starting and stopping water supply can be opened and closed quickly, and downsizing can be achieved.

  In the flash valve SV of the present embodiment, the main valve body 42 is disposed closer to the inlet 21 than the constant flow valve body 44, and when the valve member 40 is driven in a direction in which the constant flow valve body 44 reduces the flow rate, The main valve body 42 is also configured to move in the direction of reducing the flow rate.

  The flush valve SV is configured to supply water that requires a relatively large instantaneous flow rate of water such as a toilet. In a situation where such a large amount of water flows from the primary side internal flow path 20 to the secondary side internal flow path 30, the constant flow valve body 44 and the inner wall of the secondary side internal flow path 30 functioning as a constant flow valve seat. It is extremely difficult to finely adjust the distance between the two. Therefore, by disposing the main valve body 42 closer to the inlet 21 than the constant flow valve body 44, water passing through the main valve body 42 and the main valve seat surface 201 is supplied to the constant flow valve body 44. By comprising, the influence of the water pressure fluctuation | variation to the constant flow valve body 44 can be suppressed. Further, when the valve member 40 is driven in the direction in which the constant flow valve body 44 reduces the flow rate, the main valve body 42 is also configured to move in the direction to reduce the flow rate. The flow path leading to the valve body 44 can be narrowed by one stage, and the influence of water pressure fluctuation on the constant flow valve body 44 can be easily and effectively reduced.

  In the flash valve SV of the present embodiment, the spring 70 is arranged so that a force that balances with the force applied by the primary pressure in the primary side internal flow path 20 is applied to the main valve body 42. Specifically, since the position control member 50 abuts on the valve member 40 including the main valve element 42, a force that balances with the force applied to the pressure receiving surface 607 of the wall member 60 fixed to the position control member 50 is applied. In addition, a spring 70 is arranged. The opening of the main valve element 42 with respect to the main valve seat surface 201 is adjusted according to the primary pressure by the action of the spring 70.

  The spring 70 is configured so that the characteristic indicating the relationship between the applied load and the displacement becomes a linear characteristic (see FIG. 5), while the constant flow valve body 44 includes the displacement of the position of the valve member 40 and the main flow rate. The outer shape is formed so that the characteristic indicating the relationship becomes a non-linear characteristic (see FIG. 8B) (see FIG. 11).

  In general, when the flow rate is adjusted with a valve in which the valve seat and the valve body are in contact with each other, the relationship between the distance between the valve seat and the valve body and the water pressure is a non-linear relationship in which the degree of water pressure decrease increases as the distance increases. Shown (see FIG. 4). On the other hand, when a spring having a linear characteristic of applied load and displacement is used as in this preferred mode, the configuration is simple, but the characteristic of the valve is a non-linear characteristic. The main flow rate fluctuates (see FIGS. 6 and 7). Therefore, in this preferred embodiment, the external shape of the constant flow valve body 44 is devised, and the characteristic indicating the relationship between the displacement of the position of the valve member 40 and the main flow rate becomes a non-linear characteristic. As a result, the constant flow valve body 44 and the constant flow valve seat The relationship between the distance and the water pressure has a linear characteristic (see FIG. 8A), so that the main flow rate does not fluctuate even when a linear characteristic spring is used.

  In this embodiment, it is preferable that the valve member 40 is formed by molding a resin material with a mold, and at least the constant flow valve body 44 is formed by molding a resin material with a mold. By constituting by resin molding, it is possible to easily form the constant flow valve body 44 so as to constitute an outer shape satisfying the above-described characteristics.

  In the flash valve SV of the present embodiment, the spring 70 is configured so that the repulsive force increases when the position control member 50 moves in a direction to narrow the movable amount of the valve member 40, and the main valve body 42 and the main valve seat are arranged. The valve member 40 and the position control member 50 are arranged so as to be separated from each other when the surface 201 contacts and closes the flow path between the primary side internal flow path 20 and the secondary side internal flow path 30. .

  As a part of the main valve, a position control member 50 that moves along the sliding direction of the valve member 40 so as to adjust the movable amount of the valve member 40, and the position control member 50 and the primary pressure are balanced. And a spring 70 for adjusting the position of the control member 50. Therefore, the position of the position control member 50 is adjusted with a simple configuration using the spring 70, and the movable amount of the valve member 40 is adjusted to achieve a constant flow rate. Can be achieved. In the present embodiment, since the spring 70 is configured so that the repulsive force increases when the position control member 50 moves in the direction of narrowing the movable amount of the valve member 40, the water is reliably stopped even when the primary pressure is low. Therefore, it arrange | positions so that the valve member 40 and the position control member 50 may space apart at the time of water stop. As described above, when the main valve body 42 and the main valve seat surface 201 come into contact with each other to close the flow path between the primary side internal flow path 20 and the secondary side internal flow path 30 and stop the water, the valve member By disposing 40 and the position control member 50 so as to be separated from each other, it is possible to achieve both a constant flow rate with a simple configuration by the spring 70 and the position control member 50 and a reliable operation at the time of water stoppage.

  In the flash valve SV of the present embodiment, as a delay means, the water flowing from the primary side internal flow path 20 to the secondary side internal flow path 30 does not pass while the sub valve 82 is closed, and the primary side internal flow The first back pressure chamber 16 and the second back pressure as the back pressure chamber formed so that the water flowing in from the passage 20 is accumulated and the primary pressure acts in a direction to push the main valve body 42 toward the main valve seat surface 201 side. A pressure chamber 14 is provided. The bypass flow path 80 communicates the second back pressure chamber 14 and the secondary side internal flow path 30. The back pressure chamber is separated by a partition wall 19 into a first back pressure chamber 16 that applies back pressure to the valve member 40 on the primary internal flow path side 20 and a second back pressure chamber 14 on the bypass flow path 80 side. Has been. When the sub-valve 82 is opened, the water accumulated in the second back pressure chamber 14 is preferentially flowed out to the bypass flow path 80.

  On the opposite side of the valve member 40 across the first back pressure chamber 16 and the second back pressure chamber 14 as back pressure chambers, a sub back pressure chamber 12 communicating with the primary side internal flow path 20 is provided. The wall member 60 that partitions the back pressure chamber 12 and the second back pressure chamber 14 is slidable along the sliding direction of the valve member 40, and the wall member 60 and the position control member 50 are connected and integrated. It is configured to slide.

  Thus, since the bypass flow path 80 communicates the second back pressure chamber 14 and the secondary side internal flow path 30, when the sub valve 82 is opened, water in the second back pressure chamber 14 is opened. Is removed, the internal pressure in the first back pressure chamber 16 and the second back pressure chamber 14 decreases, the main valve body 42 moves away from the main valve seat surface 201, and water flows into the secondary internal flow path 30. When the sub valve 82 is closed, water flowing in from the primary side internal flow path 20 is collected, and the primary pressure acts in a direction to push the main valve body 42 toward the main valve seat surface 201 side, so that the water is surely stopped. Can do.

  Further, in the present embodiment, the auxiliary back pressure chamber 12 to which the primary pressure is applied is provided, and the wall member 60 and the position control member 50 that partition the auxiliary back pressure chamber 12 and the second back pressure chamber 14 by the primary pressure are provided on the valve member 40 side. It is configured to be pushed into. Therefore, when the sub-valve 82 is opened and the pressure in the second back pressure chamber 14 decreases, the wall member 60 is pushed into the valve member 40 side to restrict the rapid behavior of the valve member 40, and more stable flow control. Is possible.

  Further, when the sub-valve 82 is opened and the pressure in the back pressure chamber decreases, water flows out preferentially from the second back pressure chamber 14 on the bypass flow path 80 side, the pressure decreases, and the back of the valve member 40 is reduced. The pressure drop in the first back pressure chamber 16, which is the pressure application side, is configured to be delayed. Accordingly, the wall member 60 and the position control member 50 are pushed first into the valve member 40 side, and then the valve member 40 is pushed into the position control member 50 side so that the main valve body 42 is detached from the main valve seat surface 201. . By setting it as such a movement, the rapid behavior of the valve member 40 which causes overshoot can be controlled reliably, and more stable flow control is possible.

  In the present embodiment, the flow path is restricted between the first back pressure chamber 16 and the second back pressure chamber 14 so as to restrict the flow of water from the first back pressure chamber 16 to the second back pressure chamber 14. A narrowed portion 192 is provided. As described above, since the throttle portion 192 whose flow path is restricted so as to regulate the flow of water from the first back pressure chamber 16 to the second back pressure chamber 14 is provided, the first back pressure can be reduced with a simple configuration. The flow of water from the chamber 16 to the second back pressure chamber 14 can be made slow, and water can be preferentially discharged from the second back pressure chamber 14 with certainty.

  In this embodiment, the spring 70 is disposed in the second back pressure chamber 14 between the partition wall 19 and the wall member 60, and when the wall member 60 and the position control member 50 are pushed into the valve member 40 side, the repulsive force Is configured to strengthen. Thus, since the spring 70 is disposed in the second back pressure chamber 14 and between the partition wall 19 and the wall member 60, the wall member 60 and the position control member 50 are pushed into the valve member 40 side. It is configured to apply a force to push it back. Further, by arranging the spring 70 not in the auxiliary back pressure chamber 12 but in the second back pressure chamber 14, the spring 70 can be arranged in a region where water does not accumulate and an air reservoir is not constantly generated. Further, deterioration such as corrosion of the spring 70 can be reliably suppressed.

  In the present embodiment, it is configured such that air can partially pass between the wall member 60 and the inner wall surface of the auxiliary back pressure chamber 12 while sealing a region where the wall member 60 and the inner wall surface are in contact with each other. A C-ring as a sealing member is arranged.

  The auxiliary back pressure chamber 12 is configured to communicate with the primary side internal flow path 20 so that the primary pressure is always applied. Therefore, it is difficult for water inside the auxiliary back pressure chamber 12 to be exchanged. You can accumulate. If this air reservoir is left unattended, the wall member 60 and the position control member 50 are pushed in and the characteristics of balancing the reaction force of the spring 70 change, or the inner wall surface of the auxiliary back pressure chamber 12 and the sealing member deteriorate. As a result, the behavior of the position control member 50 changes, and as a result, the accuracy of the constant flow rate control may decrease. Therefore, by disposing a C-ring configured to allow air to pass partially while sealing a region where the wall member 60 and the inner wall surface of the auxiliary back pressure chamber 12 are in contact with each other, Air can be released while securing the primary pressure, and the occurrence of air pockets can be suppressed.

  In the present embodiment, the partition wall 19 is formed with a recess 191 for accommodating the spring 70 so as to protrude toward the valve member 40, and the valve recess 40 is formed with an accommodation recess 46 into which the protruding recess 191 can enter. Has been. With this configuration, the valve member 40 can slide without interfering with the partition wall 19 even if the length of the spring 70 is sufficiently secured. By sufficiently securing the length of the spring 70, even if a pressure fluctuation occurs in the flow path, it does not react sensitively, and the accuracy of constant flow control can be improved.

  In the present embodiment, a space 464 through which water flows from the primary side internal flow path 20 is formed between the valve member 40 and the portion where the recess 191 protrudes toward the valve member 40. Thus, since the space into which water flows in from the primary side internal flow path 20 is formed between the portion where the concave portion 191 protrudes toward the valve member 40 and the valve member 40, the vibration of the valve member 40 is reduced. And the behavior of the valve member 40 can be stabilized.

  In the present embodiment, a restricting portion 222 and a C ring are provided as pulsation suppressing means for suppressing pulsation of the valve member 40 due to pulsation of the primary pressure. As described above, since the pulsation suppressing means for suppressing the pulsation (hunting) of the valve member 40 due to the pulsation of the primary pressure is provided, the valve member 40 is stabilized even when a relatively large flow of water is allowed to flow. Therefore, the distance between the constant flow valve body 44 and the constant flow valve seat is not affected by the primary pressure pulsation, and the flow pulsation can be suppressed. it can.

  In the present embodiment, the valve member 40 has a pressure receiving surface 607 that substantially receives the primary pressure via the position control member 50, and is configured to be able to advance and retract according to the pressure received by the pressure receiving surface 607. As a suppression means, a narrowing portion 222 is provided as a damping mechanism in which the cross-sectional area of the flow path is narrowed so as to attenuate the pulsation of the primary pressure between the primary side internal flow path 20 and the pressure receiving surface 607.

  As described above, the valve member 40 has a configuration substantially equivalent to the pressure receiving surface 607 that receives the primary pressure in the primary side internal flow path 20, and is configured to be able to advance and retract according to the pressure received by the pressure receiving surface 607. Therefore, by controlling the pressure received by the pressure receiving surface 607, the valve member 40 can be reliably kept at a predetermined position. A narrowing portion 222 is provided as a damping mechanism in which the cross-sectional area of the flow path is narrowed so as to attenuate the pulsation of the primary pressure between the primary-side internal flow path 20 and the pressure receiving surface 607, so that the flow path is narrowed. With this simple configuration, it is possible to suppress the influence of pressure fluctuation received by the pressure receiving surface 607 to a minimum.

  In this embodiment, the water flowing into the valve member 40 from the primary side internal flow path 20 is introduced so as to be orthogonal to the advance / retreat direction of the valve member 40, and the pressure receiving surface 607 is formed to face the advance / retreat direction. Has been. Thus, the water flowing into the valve member 40 from the primary side internal flow path 20 is introduced so as to be orthogonal to the advance / retreat direction of the valve member 40, and the pressure receiving surface 607 is formed to face the advance / retreat direction. Therefore, it is possible to make it difficult for the pressure receiving surface 607 to receive the influence of fluctuations in the primary pressure.

  In this embodiment, the valve member 40 has a configuration substantially equivalent to the pressure receiving surface 607 that receives the primary pressure, and is configured to be able to advance and retreat according to the pressure received by the pressure receiving surface 607, thereby suppressing pulsation. As a means, the effect of the movement of the valve member 40 from the pulsation of the primary pressure is reduced, and as a slow member interposed between the inner wall of the main body so as to slow the movement of the valve member 40, C A ring is provided.

  As described above, as a pulsation suppressing means, the influence of the movement of the valve member 40 from the pulsation of the primary pressure is reduced, and is interposed between the inner wall of the main body so as to make the movement of the valve member 40 slow. A C-ring is provided as a slow member. Therefore, the influence of the pressure fluctuation that the valve member 40 receives can be suppressed to a minimum with a simple configuration in which a slack member that increases friction such as a C ring or a rubber ring is disposed.

  In the present embodiment, the valve member 40 slides so that the main valve body 42 (main valve body surface 421) is brought into contact with or separated from the main valve seat surface 201. A valve-side protrusion 442 and a C-ring 48 are provided as stabilizing means for suppressing the inclination of the valve member 40 so that smooth sliding is not hindered by rubbing against the inner wall of the main body 10 surrounding the main body 10.

  Thus, by providing the stabilizing means for suppressing the inclination of the valve member 40, the valve member 40 can slide stably even when a relatively large flow rate of water flows. Therefore, the sliding of the valve member 40 is not hindered by rubbing against the inner wall of the main body 10 surrounding the periphery during sliding, and stable constant flow control can be performed.

  In this embodiment, as a stabilizing means, the valve-side protrusion 442 and the C-ring 48 which are a part of the valve member 40 are in contact with a part of the main body 10 as a guide part, and the valve member 40 does not tilt by this contact and slides. It is supposed to be movable. Thus, with a simple configuration in which a part of the valve member 40 is configured as a guide portion, the valve member 40 can slide stably without tilting, and stable constant flow control can be performed.

  In the present embodiment, as a stabilizing means, a valve-side protrusion 442 that is a part of the valve member 40 serves as a guide portion, and a secondary-side internal flow path that is a part of the primary-side internal flow path 20 and the secondary-side internal flow path 30. The valve member 40 can be slid without being tilted by this contact.

  The water flowing through the primary side internal flow path 20 and the secondary side internal flow path 30 acts to incline the valve member 40 when the flow rate becomes large. In view of this, the guide member is formed inside the flow path that receives the force most likely to be tilted, so that the valve member 40 can be reliably slid without tilting.

  In the present embodiment, a valve-side protrusion 442 is provided at one end corresponding to the most downstream side of the valve member 40 as a guide portion. The water flowing through the primary side internal flow path 20 and the secondary side internal flow path 30 acts to incline the valve member 40 at a large flow rate, and the acting force increases toward the downstream side. Therefore, by providing a valve-side protrusion 442 as a guide portion at one end corresponding to the most downstream side of the valve member 40, a sufficient guide effect can be exhibited even if the valve-side protrusion 442 is formed short.

  In the present embodiment, a guide portion is formed by providing a C ring 48 at the other end of the valve member 40 opposite to the one end. Since the guide portions are provided on the one end side and the other end side of the valve member 40 in this way, the inclination of the valve member 40 can be suppressed on the one end side and the other end side, and the inclination of the valve member 40 can be more reliably performed. Can be suppressed.

  In the present embodiment, by forming the valve-side protrusion 442 formed integrally with the valve member 40, the inclination of the valve member 40 due to dimensional errors and assembly errors between members than when configured separately. Can be suppressed with a simple configuration.

  In the above-described embodiment, the constant flow valve body 44 is configured adjacent to the main valve body 42 and the valve member 40 is used so that the main valve body 42 and the constant flow valve body 44 move integrally. It is composed. Therefore, the constant flow valve body 44 is not disposed downstream from the main valve body 42 at a sufficient distance, and has substantially the same effect as that disposed from the same position to the upstream side. It can be said that. Therefore, it is considered that a modified example as shown in FIG. FIG. 14 is a view showing a flash valve SVa which is a first modification of the flash valve SV shown in FIG. The flash valve SVa has a constant flow valve 44a as a separate member attached to the upstream side.

  The flow path opening / closing mechanism portion serving as the main body has a primary side internal flow path 20a and a secondary side internal flow path 30a formed inside the main body 10a. A valve member 40a having a main valve element 42a is arranged so as to open and close the flow path between the primary side internal flow path 20a and the secondary side internal flow path 30a. A back pressure chamber 14a is formed on the opposite side of the primary side internal flow path 20a and the secondary side internal flow path 30a across the valve member 40a. The back pressure chamber 14a and the secondary side internal flow path 30a are connected by a bypass flow path 80a. A sub valve 82a is provided in the bypass flow path 80a.

  When the sub valve 82a is opened, water flows out from the back pressure chamber 14a, the internal pressure decreases, the valve member 40a is lifted, and water flows from the primary side internal flow path 20a to the secondary side internal flow path 30a. Since the water supplied to the primary side internal flow path 20a is supplied at a constant flow rate by the constant flow valve 44a, constant flow control as shown in FIG. 15 is possible. FIG. 15 is a diagram showing the water discharge characteristics of the flash valve SVa shown in FIG.

  As shown in FIG. 15, the water discharge flow rate increases from the water discharge start time t1 to the time t1c, and the water discharge flow rate is gradually decreased from the time t2 to the water discharge end time t2c after the water discharge flow rate is constant until the time t2. Watered. Compared to the diagram shown in FIG. 12, it can be seen that the flash valve SVa takes longer to reach a constant flow rate than the flash valve SV.

  The flush valve SVa is arranged with the constant flow valve 44a on the upstream side with respect to the main body portion 10a functioning as a main valve, and eliminates the disadvantages of being arranged on the downstream side. For comparison, FIG. 16 shows water discharge characteristics when the constant flow valve 44a is arranged on the downstream side.

  As shown in FIG. 16, after the water discharge start time t1 to time t1d, the water discharge flow rate suddenly increases or decreases rapidly and is not stable, and after stabilization, after a constant flow of water discharge until time t2 From the time t2 to the water discharge end time t2d, the water discharge flow rate gradually decreases and the water is stopped. If the constant flow valve 44a is arranged on the downstream side in this way, air is involved in the early stage of water discharge, and the water discharge is not stable and makes a loud sound.

  Therefore, according to this modification, the constant flow valve 44a as the constant flow means is arranged from the position where the main valve body 42a and the main valve seat are arranged to the upstream side. Even if the water is stopped by contacting the water, air does not collect from that portion to the constant flow valve 44a. Therefore, even when water supply is started, it is possible to prevent the generation of a loud sound involving air. Furthermore, since the start of water supply and the start of constant flow rate adjustment can be performed without entraining air, it is possible to smoothly and reliably supply water with a target flow rate.

  Next, a flash valve SVb as an example when the flash valve SV shown in FIG. 2 is actually configured will be described with reference to FIG. FIG. 17 is a configuration diagram showing a flash valve SVb as an example when the flash valve SV shown in FIG. 2 is actually configured.

  As shown in FIG. 17, the flash valve SVb includes a main body portion 10b. Inside the main body 10b, there are a primary side internal flow path 20b, a secondary side internal flow path 30b, a first back pressure chamber 16b (back pressure chamber), and a second back pressure chamber 14b (back pressure chamber). The auxiliary back pressure chamber 12b is formed. The primary side internal flow path 20b receives the inflow water Wa from the primary side flow path that is a water supply source, and flows it out toward the secondary side internal flow path 30b. An inlet 21b is provided at the upstream end of the primary side internal flow path 20b. The inflow port 21b is an opening that receives the inflow water Wa and sends it out to the primary side internal flow path 20b.

  The secondary-side internal flow path 30b allows water flowing in from the primary-side internal flow path 20b to flow out to the secondary-side flow path that is a water supply destination as effluent water Wb. An outlet 31b is provided at the downstream end of the secondary side internal flow path 30b. The outflow port 31b is an opening for sending out the effluent water Wb from the secondary side internal flow path 30b to the secondary side flow path.

  Between the primary side internal flow path 20b and the secondary side internal flow path 30b, the valve which has the main valve body 42b which opens and closes the flow path between the primary side internal flow path 20b and the secondary side internal flow path 30b. A member 40b is arranged. The valve member 40b is disposed such that one end on the downstream side is inserted into the secondary side internal flow path 30b and the other end on the opposite side faces the second back pressure chamber 14b. The valve member 40b is disposed so as to freely advance and retract along the direction in which the secondary-side internal flow path 30b extends. A constant flow valve body 44b (constant flow means) is provided in a portion of the valve member 40b downstream of the main valve body 42b.

  An accommodation recess 46b is provided on the opposite side of the valve member 40b to the constant flow valve body 44b across the main valve body 42b. The housing recess 46b is formed in a concave shape so as to recede from the first back pressure chamber 16b side. A U-packing 48b is provided at the end of the housing recess 46b on the first back pressure chamber 16b side. The U packing 48b is provided so as to come into contact with the inner wall of the main body portion 10b on the secondary side internal flow path 30b side with respect to the first back pressure chamber 16b.

  A gap is formed between the U-packing 48b and the main valve body 42b so that water can enter, and the gap serves as a throttle channel 162b. Therefore, water is configured to flow between the accommodation recess 46b and the inner wall of the main body 10b from the primary side internal flow path 20b through the throttle flow path 162b in a state where the speed is reduced.

  A hole 462b for connecting the primary side internal flow path 20b and the first back pressure chamber 16b is formed in the housing recess 46b. Therefore, it flows from the primary side internal flow path 20b to the first back pressure chamber 16b through the hole 462b.

  The first back pressure chamber 16b and the second back pressure chamber 14b are separated by a partition wall 19b. A recess 191b is provided in the partition wall 19b. The recessed portion 191b is formed as a recessed portion whose outer wall protrudes from the second back pressure chamber 14b toward the first back pressure chamber 16b. A spring 70b (constant flow rate means) having a linear characteristic is disposed on the second back pressure chamber 14b side of the recess 191b. One end of the spring 70b is accommodated in the recess 191b, and the other end is disposed so as to contact the wall member 60b that partitions the auxiliary back pressure chamber 12b and the second back pressure chamber 14b.

  The bottom surface of the recess 191b is formed so that the rod-shaped position control member 50b penetrates, and a gap is formed between the bottom surface of the recess 191b and the position control member 50b to form the narrowed portion 192b. Accordingly, the water that has entered from the primary side internal flow path 20b flows through the hole 462b to the first back pressure chamber 16b, and flows through the throttle portion 192b to the second back pressure chamber 14b.

  The position control member 50b is disposed so as to penetrate the center of the winding of the spring 70b. One end of the position control member 50b is disposed so as to abut against or separate from the bottom surface of the accommodating recess 46b in the valve member 40b, and the other end of the position control member 50b is fixed to the wall member 60b.

  The housing recess 46b is configured such that when the valve member 40b approaches the partition wall 19b, the recess 191b of the partition wall 19b is housed therein. A space 464b is formed between the housing recess 46b and the recess 191b. By filling the space 464b with water, the behavior of the housing recess 46b with respect to the recess 191b is alleviated, and the behavior of the valve member 40b is stable. To do.

  The wall member 60b includes a lower wall member 602b, a U packing 604b, and an upper wall member 606b. The lower wall member 602b is a wall facing the second back pressure chamber 14b. The upper wall member 606b is a wall facing the auxiliary back pressure chamber 12b. The U packing 604b is held between the lower wall member 602b and the upper wall member 606b. The U packing 604b is disposed so as to be in close contact with the inner wall of the main body portion 10b between the auxiliary back pressure chamber 12b and the second back pressure chamber 14b.

  The wall member 60b slides so as to widen the sub back pressure chamber 12b (narrow the second back pressure chamber 14b) by the pressure difference between the sub back pressure chamber 12b and the second back pressure chamber 14b, or It is configured to slide so as to narrow the chamber 12b (expand the second back pressure chamber 14b). Since the position control member 50b is fixed to the lower wall member 602b of the wall member 60b, the position control member 50b is also moved by sliding of the wall member 60b.

  The auxiliary back pressure chamber 12b is configured to be applied with the same pressure as the primary pressure applied to the primary side internal flow path 20b. Specifically, the primary side internal flow path 20b and the secondary back pressure chamber 12b are connected by the secondary primary flow path 22b, and the primary pressure is transmitted to the secondary back pressure chamber 12b. An annular channel 224b formed so as to surround the auxiliary back pressure chamber 12b is formed on the auxiliary back pressure chamber 12b side of the auxiliary primary channel 22b. The annular channel 224b and the auxiliary back pressure chamber 12b are connected by a plurality of communication holes 122b. The plurality of communication holes 122b are formed uniformly around the outer periphery of the auxiliary back pressure chamber 12b surrounding the sliding direction of the valve member 40b. As described above, the plurality of communication holes 122b through which water flows from the secondary primary flow path 22b for applying primary pressure to the secondary back pressure chamber 12b are formed evenly around the outer periphery surrounding the sliding direction of the valve member 40b. The behavior of the wall member 60b for regulating the movement of the valve member 40b can also be made stable, and the sliding of the valve member 40b becomes more stable.

  The second back pressure chamber 14b and the secondary side internal flow path 30b are connected by a bypass flow path 80b. On the second back pressure chamber 14b side of the bypass channel 80b, an enlarged diameter portion 802b formed so as to surround the second back pressure chamber is formed. The enlarged diameter portion 802b and the second back pressure chamber 14b are connected by a plurality of communication holes 142b. In order to explain this state, FIG. 18 shows an AA cross section. As shown in FIG. 18, the four communication holes 142b are equally formed around the outer periphery of the second back pressure chamber 14b surrounding the sliding direction of the valve member 40b.

  Thus, in the flush valve SVb, in order to reduce the outflow speed of water from the bypass flow path 80b when the sub valve on the bypass flow path 80b is opened on the second back pressure chamber 14b side of the bypass flow path 80b. An enlarged-diameter portion 802b having an enlarged channel cross-sectional area is provided.

  Since the bypass flow path 80b communicates the second back pressure chamber 14b and the secondary side internal flow path 30b, when the secondary valve on the bypass flow path 80b is opened, the second back pressure chamber 14b and the second back pressure chamber 14b are connected. The water in the one back pressure chamber 16b is drained, the internal pressure in the second back pressure chamber 14b and the first back pressure chamber 16b decreases, and the main valve body 42b moves away from the main valve seat to the secondary side internal flow path 30b. Water flows. In this case, the sub-valve on the bypass flow path 80b is opened, the flow rate of water from the bypass flow path 80b is high, and the water in the second back pressure chamber 14b and the first back pressure chamber 16b is drained all at once. Then, the behavior of the main valve element 42 becomes unstable. Therefore, by providing the enlarged diameter portion 802b having an enlarged flow path cross-sectional area in order to reduce the flow rate of water from the bypass flow path 80b, the behavior of the main valve body 42b is stabilized and integrated with the main valve body 42b. The behavior of the constant flow valve body 44b formed in the above can also be stabilized.

  In the flash valve SVb, the enlarged diameter portion 802b and the second back pressure chamber 14b communicate with each other through a communication hole 142b having an opening area smaller than the flow passage cross-sectional area of the enlarged diameter portion 802b. A plurality of portions are formed uniformly around the outer periphery surrounding the sliding direction of 40b.

  By configuring in this way, the water flowing out from the second back pressure chamber 14b to the bypass flow path 80b is configured to be even around the sliding direction of the valve member 40b. Therefore, the influence of the water flowing out from the second back pressure chamber 14b to the bypass flow path 80b on the valve member 40b is not biased, and the sliding of the valve member 40b becomes more stable.

  In the flash valve SVb, the communication hole 142b is formed close to the flat surface 193b of the recess 191b that is a wall surface orthogonal to the sliding direction of the valve member 40b of the second back pressure chamber 14b.

  In this way, the hole connecting the enlarged diameter portion 802b and the second back pressure chamber 14b is brought close to the flat surface 193b of the recess 191b which is a wall surface orthogonal to the sliding direction of the valve member 40b in the second back pressure chamber 14b. Therefore, the flow of water when the water flows out from the communication hole 142b is along the flat surface 193b. Therefore, the influence of the rectifying action of the flat surface 193b on the sliding of the valve member 40b can be reduced, and the sliding of the valve member 40b becomes more stable.

SV: Flush valve (channel opening / closing device)
SB: Toilet bowl TB: Water supply pipe 10: Body 20: Primary side internal flow path 21: Inlet 22: Sub primary flow path 30: Secondary side internal flow path 31: Outlet 40: Valve member (main valve)
42: Main valve body 44: Constant flow valve body (constant flow means)
46: Housing recess 48: C-ring (slow member)
50: Position control member 60: Wall member 70: Spring (constant flow rate means)
80: Bypass channel 82: Sub valve 12: Sub back pressure chamber 14: Second back pressure chamber (back pressure chamber)
16: First back pressure chamber (back pressure chamber)
18: intermediate chamber 19: partition wall 122: hole 142: hole 161: restricting portion (delay means)
162: Restricted flow path (delay means)
191: Recess 192: Restricting portion 201: Main valve seat surface (main valve seat)
222: Restricting part (pulsation suppressing means, damping mechanism)
421: Main valve element surface (main valve element)
441: Inclined surface (outer surface)
442: Valve side protrusion (guide portion, stabilization means)
462: Hole 464: Space 602: Lower wall member 604: C ring 606: Upper wall member 607: Pressure receiving surface Wa: Inflow water Wb: Outflow water

Claims (6)

A flow path opening and closing device that starts water supply to a toilet by receiving an instruction to start water supply and autonomously stops water supply by satisfying a predetermined condition,
An inlet that receives water from the primary flow path that is the water supply source and sends it to the primary internal flow path, and an outlet that sends water from the secondary internal flow path to the secondary flow path that is the water supply destination are formed. The main body,
A main valve having a main valve body and a main valve seat for opening and closing a flow path between the primary side internal flow path and the secondary side internal flow path;
A bypass flow path communicating the primary side internal flow path and the secondary side internal flow path without passing between the main valve and the main valve body;
A sub valve for opening and closing the bypass channel;
When the sub valve is opened, the back pressure of the main valve body is reduced, the main valve is opened, and after the water flows from the primary side internal flow path to the secondary side internal flow path, the sub valve When closed, the main valve is kept open until the back pressure of the main valve body rises to balance with the primary pressure in the primary side internal flow path, delaying the closing of the main valve. Delay means;
With
The main valve incorporates constant flow means that operates to keep the main flow rate flowing from the primary side internal flow path to the secondary side internal flow path constant,
The constant flow means has a constant flow valve body and a constant flow valve seat having an inclined surface, and operates to adjust the distance between the constant flow valve body and the constant flow valve seat,
The main valve body and the constant flow valve body are formed as an integrated valve member,
A flow path opening and closing device comprising pulsation suppressing means for suppressing pulsation of the valve member due to pulsation of the primary pressure. The valve member has a pressure receiving surface that receives the primary pressure, and is configured to advance and retreat according to the pressure received by the pressure receiving surface,
As the pulsation suppressing means, a damping mechanism having a flow path cross-sectional area narrowed so as to attenuate the pulsation of the primary pressure is provided between the primary side internal flow path and the pressure receiving surface. The flow path opening and closing device according to claim 1.   Water flowing into the valve member from the primary side internal flow path is introduced so as to be orthogonal to the advancing / retreating direction of the valve member, and the pressure receiving surface is formed to face the advancing / retreating direction. The flow path opening / closing device according to claim 2, wherein A spring is arranged so that a force that balances with the force applied by the primary pressure in the primary internal flow passage is applied to the main valve body,
The opening of the main valve body with respect to the main valve seat by the action of the spring is adjusted according to the primary pressure,
The spring does not pass water flowing from the primary side internal flow path to the secondary side internal flow path at least while the sub valve is closed, and stores water flowing from the primary side internal flow path. The flow path opening and closing device according to claim 2, wherein the primary pressure is disposed in a back pressure chamber formed so as to act in a direction of pushing the main valve body toward the main valve seat. The delay means includes a hole communicating the primary side internal flow path and the back pressure chamber, and water passes through the hole to reduce the back pressure of the main valve body to the primary pressure in the primary side internal flow path. To increase in equilibrium with
5. The flow path opening / closing device according to claim 4, wherein water that has passed through the hole flows into the back pressure chamber so as to be orthogonal to the direction of expansion and contraction of the spring. The valve member has a pressure receiving surface that receives the primary pressure, and is configured to advance and retreat according to the pressure received by the pressure receiving surface,
As the pulsation suppressing means, the influence of movement of the valve member from the pulsation of the primary pressure is reduced, and the slow movement interposed between the inner wall of the main body so as to make the movement of the valve member slow. The channel opening and closing device according to claim 1, wherein a member is provided.