JPH066843U - Check valve - Google Patents

Abstract

(57) [Summary] [Purpose] To make the valve opening speed of the check valve moderate so that it can be optimally used in the fields of hot water supply and hot water mixing taps that receive water supply with different supply pressures. In a check valve including a valve element biased by a spring or the like in a valve closing direction, by providing a resistance mechanism that gives resistance to the valve element when moving the valve element in its valve opening direction, The check valve can be opened gently even if the water pressure on the water supply side is high. As the resistance mechanism, a chamber for accommodating a part of the valve element movably in the opening / closing operation direction is provided in the flow channel, and water in the chamber can be freely taken in and out of the flow channel by the movement of the valve element. A small hole to be opened can be formed in this chamber, and when the valve body moves in the valve opening direction, in addition to the resistance due to the elastic body,
It also allows the resistance of the water in the chamber to drain through the stoma.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a check valve incorporated in various faucets or in a joint, for example, in a hot and cold water mixing tap so that hot water is not bathed by slowing the opening operation of the valve. The present invention relates to a slowly opening check valve.

[0002]

[Prior art]

 As one of the shower facilities provided in a bathroom, a hot and cold water mixing tap that can be used for supplying hot water to a bathtub and hot water to a shower has been generally used.

This hot and cold water mixing tap is fixed at the same time when the leg pipes provided at the back of the main body are connected to the water supply pipes and hot water supply pipes connected to the building, and the flow passages are switched between the water discharge pipe side and the shower side. It is a thing. In such a hot and cold water mixing valve, a check valve for preventing backflow from the hot water side to the water side is incorporated, and the check valve is disclosed, for example, in Japanese Utility Model Publication No. 1-31822 and Japanese Utility Model Publication No. 3-25462. As described in gazettes, etc., it is often provided at the connecting portion between the leg tube and the main body.

The basic structure of a check valve incorporated in not only a hot and cold water mixing tap but also various other types of taps is that a spring for urging a valve body provided in an internal flow passage in a valve closing direction is provided on a secondary side. It is provided that the valve body moves and the valve opens when the water supply pressure from the primary side exceeds the biasing force of the spring. Then, when the water is stopped, the water pressure load on the valve body becomes small, and the spring is restored accordingly, and the valve body returns to its closed position.

As described above, the check valve used for the faucet or the like has a relatively simple structure including the spring, and its operation also utilizes the magnitude of the water pressure.

[0006]

[Problems to be solved by the device]

 The hot and cold water mixing valve is a two-valve type that sets the valve opening on the hot water side and the valve opening on the water side separately, and the automatic temperature control that changes the valve opening on the water side and the hot water side with a single valve body. There are various types of thermostat mixing valves with adjustment functions.

Here, consider a case where, for example, a bathroom is provided with a thermostat mixing valve type hot and cold water mixing tap, and a kitchen is provided with a tap connected to a common water supply source. When water is being used by the faucet of the kitchen, if you try to spout 40 ° C hot water with the thermostat mixing valve type hot and cold water mixing tap in the bathroom, the pressure on the hot water side becomes higher than the pressure on the water side, and the pressure The balance will be lost. For this reason, the mixing ratio of water and hot water also fluctuates so as to be higher on the hot water side.

On the other hand, the control valve is operated to decrease the valve opening on the hot water side and increase the valve opening on the water side by the automatic temperature adjusting function of the thermostat mixing valve. However, there is a time lag until the control valve shift is completed, and during this transition period, the amount of hot water on the high pressure side is large, so hot water above the set temperature is discharged. Will be done.

On the other hand, when the supply pressure of the hot water and the supply pressure of the water fluctuate, a fluctuation also appears in the opening method of the check valve incorporated in the flow path. That is, as described above, in the check valve, the valve moves so that the valve opening increases in proportion to the water pressure, and water and hot water are supplied without suppressing fluctuations in the supply pressure. Therefore, even with a thermostatic mixing valve, for example, temporary hot water discharge cannot be avoided due to the pressure fluctuation due to the decrease in water pressure and the time delay of the automatic temperature adjustment function as described above.

As described above, by providing the check valves on the hot water supply side and the hot water supply side, respectively, it is possible to prevent hot water or water from flowing back to the hot water supply source and the hot water supply source side. However, when there is a difference in the supply pressure between the hot water and water, it is insufficient to mix the hot water and water properly.

Further, not only is the mixing of the hot and cold water in the hot and cold water mixing valve poor, but even with a check valve incorporated in piping equipment that mixes two or more types of liquids, the supply pressure of each liquid is different. If so, the same problem as described above occurs.

The problem to be solved in the present invention is to make the valve opening speed of the check valve gentle so that it can be optimally used in the fields of hot water supply and hot water mixing taps that receive water supply with different supply pressures, for example. It is in.

[0013]

[Means for Solving the Problems]

 The present invention is provided with a valve body which is incorporated in a flow path of a faucet and opens by a pressure of a fluid flowing from upstream to downstream, and elastic means for urging the valve body in its valve closing direction. The check valve is provided with a resistance mechanism that gives resistance when the valve body is moved in the valve opening direction.

Further, a chamber that accommodates a part of the valve element so as to be movable in the opening / closing operation direction of the valve element is provided on the downstream side of the seating surface of the valve element, and the chamber stores the accommodated valve element. A resistance mechanism can be provided by forming a small hole that allows the fluid in the flow path to move in and out when part of the movement.

Furthermore, the faucet may be a hot and cold water mixing tap for mixing water and hot water, and the check valve of the present invention may be incorporated in the hot water supply path to the hot and cold water mixing tap.

[0016]

[Action]

 When the main valve on the faucet side is opened, the check valve opens due to the difference between the water pressure from the water source and the water pressure inside the faucet, and when the main valve is closed, the flow pressure from the water source side decreases and The body returns to the closed position due to the restoration of the elastic body. In such an operation, when the valve is opened, the valve body is biased in the valve closing direction by the elastic body, so this biasing force acts as a force for preventing the valve opening.

On the other hand, due to the resistance mechanism that gives resistance to the movement of the valve body when it opens, the valve body makes a slow movement with a slow valve opening speed. For example, in the case where a chamber that accommodates a part of the valve body so that it can move in the opening / closing direction is provided, the part of the valve body that is housed in the chamber so as to move in the opening / closing direction does not It moves like pushing water out of a small hole. Therefore, when the valve body moves in the valve opening direction, the force pushing out in the chamber acts as a resistance and acts on the valve body. Therefore, the valve body receives not only the resistance due to the elastic body but also the resistance due to the discharge of water in the chamber.

As described above, even if the supply pressure is high, if a part of the valve body is housed in the chamber and water is discharged from the chamber, a larger resistance than that obtained by using only the elastic body can be provided. The valve can be opened gently.

Further, by providing a check valve in the hot water supply path of the hot and cold water mixing tap, the pressure balance is lost in the initial stage of using the mixed water, and the pressure on either the hot water side or the hot water side temporarily becomes high. Even so, the valve opens gently.

[0020]

【Example】

 FIG. 1 is a cross-sectional view showing a main part of a hot and cold water mixing valve incorporating the check valve of the present invention, and FIG. 2 is a cutaway front view of the hot and cold water mixing valve. 3 is a perspective view of another type of hot and cold water mixing valve as seen from the back, which is similar to the hot and cold water mixing valve of FIG.

In FIG. 2, leg pipes 2 and 3 for water supply and hot water supply are connected to the back of the body 1 of the hot and cold water mixing valve, and a water discharge pipe 4 is provided on the front side. The leg tubes 2 and 3 are connected to the main body 1 by means of cap nuts 2a and 3a as shown in FIG. The check valve shown in FIG. 1 is incorporated in the leg pipe 3 for hot water supply, and the leg pipe 2 on the water supply side is also provided with a similar check valve (not shown).

The hot and cold water mixing valve is a thermostat mixing valve having an automatic temperature adjusting function, and a temperature adjusting handle 1a is provided at the right end of the main body 1, and a water discharge pipe 4 side and a shower (not shown) side are provided on the front side. A switching handle 1b is provided for switching the flow path between and and setting the flow rate.

Inside the main body 1, a control valve body 1c incorporated in a portion communicating with the water supply and hot water supply passages from the leg pipes 2 and 3, and a temperature sensing body located downstream of the control valve body 1c With 1d. The temperature sensitive body 1d is mechanically connected to the temperature control handle 1a by a spindle 1e, and one end of a sleeve 1f integrally provided around the temperature control handle 1a is abutted against the control valve body 1c. Further, a water valve seat 1g and a hot water valve seat 1h are provided so as to face both end surfaces of the control valve body 1c in the axial direction, and the opening degrees between the valve seats 1g and 1h and the both ends of the control valve body 1c are uniaxial. The mixing ratio of hot water and water can be changed by adjusting with.

In such a hot and cold water mixing tap, as is conventionally known, when the temperature of the mixed water is set by the temperature adjusting handle 1a, the temperature of the mixed water does not change even if the pressure of the hot water changes. With the function to automatically return the fluctuation of to the set temperature. That is, when the hot water supply pressure becomes higher, the temperature of the mixed water toward the water discharge end also becomes higher accordingly, but the temperature sensing element 1d abutting against the spindle 1e through the pin 1g-1 is placed inside the wax pellet. The expansion of the hood causes it to move to the left in FIG. As a result, the sleeve 1f, which is integrated with the temperature sensing element 1d, pushes the control valve element 1c toward the hot water valve seat 1h side, and as a result, the hot water side opening is small and the water side opening is large, so that the hot water is squeezed. At the same time, the amount of water is increased, the temperature rise is suppressed and the temperature is maintained at the set temperature. On the contrary, when the water supply pressure is high, the wax pellet contracts, and the temperature sensing element 1d moves to the right side in the figure. As a result, the control valve element 1c moves to increase the opening on the hot water side and suppresses the temperature drop. To do.

In FIG. 1, a check valve 5 housed in a pipe end portion of a leg pipe 3 for hot water supply uses a valve seat cylinder 5a and a cap 5b fitted on one end thereof as an outer shell member. It is fixed in the pipe 3 by screwing. The valve seat cylinder 5a is formed with a reduced diameter portion at one end as a seal surface, and a valve body 5c which can be seated on the seal surface is incorporated, and a spring 5d for biasing the valve body 5c toward the seal surface side is provided. It is interposed between the cap 5b as an elastic body.

The valve body 5c projects a rod 5e coaxially from a head portion seated on the sealing surface of the valve seat cylinder 5a, and a cap 5b is provided with a chamber 5f for movably housing the rod 5e. The chamber 5f has an inner diameter slightly larger than that of the rod 5e, and has such a length that the tip of the rod 5e is located at a substantially intermediate position in the axial direction of the chamber 5f when the valve body 5c is closed. . A small hole 5g that connects the inside of the chamber 5f and the flow path toward the main body 1 is axially formed in the wall that defines the tip portion of the chamber 5f.

On the other hand, the check valve is also incorporated in the water-side leg pipe 2 as described above, which is the same as that described in FIG. 1 or described in the publication shown in the conventional example. Can be normal.

In the above configuration, when the flow path on the water discharge pipe 4 side or the shower side is opened by the switching handle 1b, water and hot water are supplied to the inside of the main body 1 from the leg pipes 2 and 3, respectively, and the control valve body 1c is supplied. And mixed water set based on the valve opening set between the water valve seat 1g and the hot water valve seat 1h, and supplied to the discharge end.

When the supply of the mixed water is started in this way, inside the leg pipe 3 on the hot water supply side, in the flow path sandwiching the check valve 5 with the outflow of the mixed water remaining in the main body 1. The pressure balance is lost. Therefore, in FIG. 1, the hot water flows in the direction of the arrow and the valve body 5c of the check valve 5 tends to move away from the sealing surface of the valve seat cylinder 5a.

On the other hand, the acting force for maintaining the valve body 5c in its closed position is the urging force of the spring 5d and the water in the chamber 5f in which the rod 5e is housed. The restraining force of the spring 5d is the same as that of the conventional check valve, but when the valve 5e is opened, the rod 5e discharges the water in the chamber 5f from the small hole 5g. The pressure of the water is applied as a load. Therefore, when the hot water supply pressure is high, immediately after the internal flow path of the main body 1 of the hot and cold water mixing valve is opened, the valve body 5c continues to receive resistance when the water in the chamber 5f is discharged from the small hole 5g. Therefore, the valve body 5c does not suddenly open simultaneously with the opening of the valve on the main body 1 side.

In this way, when the hot water supply operation of the hot and cold water mixing valve is performed, the check valve 5 in the leg pipe 3 does not instantly open the flow path but opens gently. Therefore, even when the hot water supply pressure is high and the hot water supply pressure is low, the amount of hot water that precedes the main body 1 is suppressed at the initial stage of the valve opening operation on the hot and cold water mixing tap side. As a result, it is possible to prevent hot water from being discharged from the water discharge end in the initial stage of the valve opening operation of the hot and cold water mixing valve. Therefore, even for a hot and cold water mixing tap that is connected to hot water supply and hot water supply pipes, which tend to cause a difference in supply pressure, if the check valve 5 of the present invention is incorporated into the flow path on the hot water supply side, the difference in supply pressure can be absorbed. Water and hot water can be properly mixed, and unnecessary temperature fluctuations can be prevented.

Here, in a thermostat mixing valve having an automatic temperature adjustment function, the basic structure is to correct the temperature of water supply, hot water supply, and the temperature that fluctuates depending on the supply pressure. Such a function is achieved by determining the axial position of the control valve element 1c based on the expansion / contraction of the wax pellet of the temperature sensing element 1d. Therefore, the responsiveness to the temperature change of the temperature sensitive body 1d is important, but when relying on the wax pellet, the occurrence of the time delay cannot be stopped to some extent as described in the section of the prior art.

On the other hand, if the rapid inflow of hot water at the initial stage of valve opening operation is suppressed and the steady ratio of hot water to water during the mixing process can be maintained even at the initial stage of valve opening, the wax pellets can be used. It is possible to eliminate the delay in the responsiveness of the control valve element 1c due to the temperature sensing element 1d used. That is, by slowing the supply of hot water, the temporary large expansion of the wax pellet due to the rapid inflow of hot water disappears. Therefore, the unnecessary movement of the control valve body 1c is also eliminated, and the position setting of the control valve body 1c toward the steady state after the valve opening is favorably performed by the temperature sensing body 1d. For this reason, the obstacle of delayed response is eliminated, and stable water discharge with little temperature fluctuation becomes possible.

Although an example in which a check valve is provided in the hot water supply passage of the hot and cold water mixing valve has been described, the check valve of the present invention may be incorporated not only in the faucet tool but also in various pipes. Of course, what you can do is.

[0035]

[Effect of device]

 In the present invention, the valve body that is opened by the flow pressure of passing water or hot water can be opened gently. For this reason, it is possible to prevent hot water from being discharged at the initial stage of valve opening of the hot and cold water mixing valve by incorporating it into the hot water supply side with a high supply pressure, such as a hot and cold water mixing valve. During that time, it becomes possible to discharge water while suppressing temperature fluctuations.

Also, by incorporating the check valve of the present invention in the flow path on the hot water side of the thermostat mixing valve having the automatic temperature adjusting function, there is a problem due to a time delay of the automatic temperature adjusting function when the hot water supply pressure rapidly increases. It is also possible to prevent problems of temperature fluctuations due to the combined use of water and hot water supply systems in multiple facilities such as bathrooms and kitchens.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part of a check valve of the present invention incorporated into a leg pipe of a hot and cold water mixing valve.

FIG. 2 is a cutaway front view of a hot and cold water mixing valve.

FIG. 3 is a perspective view similar to the hot and cold water mixing valve of FIG. 2 and showing the position of a leg pipe provided at the back of the main body.

[Explanation of symbols]

 1 main body 1a temperature adjustment handle 1b switching handle 1c control valve body 1d temperature sensing body 2 leg pipe 3 leg pipe 4 water discharge pipe 5 check valve 5a valve seat cylinder 5b cap 5c valve body 5d spring (elastic body) 5e rod 5f chamber 5g Small hole

Claims (3)

[Scope of utility model registration request] 1. A valve body which is incorporated in a flow path of a faucet and which is opened by pressure of a fluid flowing from upstream to downstream,
A check valve having elastic means for urging the valve body in the valve closing direction, wherein a resistance mechanism for providing resistance when moving the valve body in the valve opening direction is provided. Check valve. 2. A valve body, which is incorporated in a flow path of a faucet and opens by a pressure of a fluid flowing from upstream to downstream,
A check valve having elastic means for urging the valve body in the valve closing direction, wherein the valve body comprises a chamber for accommodating a part of the valve body so as to be movable in the opening / closing direction of the valve body. The check valve is provided on the downstream side of the seating surface, and has a small hole formed in the chamber to allow the fluid in the flow path to flow in and out when a part of the stored valve body moves. 3. The check valve according to claim 1, wherein the faucet is a hot and cold water mixing tap for mixing water and hot water, and is incorporated in a hot water supply path to the hot and cold water mixing tap.