JP4058707B2 - Mixed proportional valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mixing proportional valve that adjusts the mixing ratio of hot water and water discharged from a heat exchanger such as a water heater and can also proportionally control the amount of hot water.
[0002]
[Prior art]
When mixing hot water and water from a heat exchanger such as a water heater and supplying them at an appropriate temperature, the two inlets facing each other, the valve seats provided in each inlet hole, and between each inlet A three-way valve having a valve body with a single outlet disposed on the valve body, and a valve body having a valve that abuts against the valve seat of each inflow port facing each other is provided slidably within the valve body When the opening of the valve seat on one side decreases due to the sliding of the valve body, the opening of the valve seat on the other side increases, and by operating this valve body with a manual lever, cock, etc. A mixing valve that adjusts the mixing ratio and supplies mixed water is used.
[0003]
Using the mixing valve as described above, it is difficult to manually adjust the temperature to a predetermined value due to changes in the temperature of the hot water, changes in the amount of water, etc., so this is also automatically adjusted. In addition, a motor that is driven and controlled by detecting the temperature of hot water discharged from the valve body, and the valve body slid within the valve body by the rotation of the motor is also used.
[0004]
On the other hand, there is a limit to the capacity of a heat exchanger such as a water heater, and when a large heat exchanger cannot be used, the temperature of tap water flowing in during cold weather such as winter is low. In some cases, even if the valve on the hot water supply side of the mixing valve is opened to the maximum and the amount of water to be mixed is zero, it may not rise to a predetermined temperature. At this time, in order to increase the temperature of the hot water, the temperature of the hot water coming out of the heat exchanger can be increased by reducing the amount of water passing through the heat exchanger supplying a certain amount of heat. As a countermeasure, a hot water throttle valve as a proportional valve is provided in the flow path on the heat exchanger side so that the amount of hot water is changed according to the temperature. As another countermeasure, a ball valve having a special hole angle is used as a valve for a hot water throttle valve, and the amount of water on the hot water side can be adjusted.
[0005]
[Problems to be solved by the invention]
In the above-mentioned conventional apparatus, a mixing valve for adjusting the mixing ratio of hot water and water is provided to change the mixing ratio according to the temperature, and a tapping valve as a proportional valve is provided in the flow path on the heat exchanger side, In the case of changing the amount of hot water according to the condition, two valves, a mixing valve and a hot water throttle valve, are used in the flow path, so that the equipment cost must be expensive. In addition, when a ball valve with a special hole angle as described above is used and the flow rate on the hot water side can be adjusted, the sound of the fluid squeezed by this ball valve is loud and generates noise. When it is desired to change the mixing characteristics and water quantity characteristics, the adjustment is extremely difficult. In order to eliminate the above-mentioned drawbacks, it is conceivable to increase the flow rate by providing a plurality of fluid conduits in parallel. However, in this case, the mechanism becomes complicated and the equipment cost becomes expensive.
[0006]
Therefore, the present invention can perform the functions of a mixing valve for mixing hot water and water and a tapping throttle valve for proportionally controlling the amount of hot water outflow by a single device, and can be an inexpensive device with a simple configuration. An object is to provide a mixing proportional valve.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is provided with a hot water throttle valve, a hot water valve, and a cam formed between the hot water throttle valve and the hot water valve. Spindle
A mixed water outlet, a hot water inlet, a water inlet, a first valve seat provided at the mixed water outlet, a second valve seat provided at a valve holding portion fixed to the hot water inlet opposite the first valve seat, and the water A valve body provided with a third valve seat provided at the inlet;
A mixing proportional valve comprising a rod and a water valve provided with a valve portion, which is slidably supported with respect to the valve body and is urged so that one end abuts against the cam of the spindle,
As the spindle rotates, the water valve moves to the close side, which is in close contact with the third valve seat, and at the same time, the spindle moves in the axial direction so that the hot water valve separates from the second valve seat. And the mixing ratio of the hot water and water is changed, the water valve is fully closed and the hot water valve is fully opened, and then the hot water throttle valve is close to the first valve seat to start the closing operation , The hot water throttle valve and the cam are set so that the amount of hot water discharged is reduced by further movement of the spindle in the axial direction.
[0008]
[Action]
Since the present invention is configured as described above, when the spindle is rotated by the driving device, the cam rotates, thereby opening and closing the water valve in contact with the cam, and at the same time, the spindle slides in the axial direction. Can be opened and closed in conjunction with each other, and the tapping valve can also be opened and closed in conjunction with it. By the above operation of the spindle, the temperature of the hot water is controlled by first changing the mixing ratio of water and hot water. After the amount of water becomes zero, the hot water temperature is controlled proportionally by the hot water throttle valve to control the hot water temperature. The function of the adjustment valve for the mixing ratio of hot water and water and the function of the hot water throttle valve for proportional control of the hot water flow rate can be achieved with a single device, An inexpensive mixing proportional valve device can be obtained.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of an embodiment of the present invention. A valve body 1 has a mixed water outlet 2 bent in the lower part of the figure and facing in the lateral direction, and an opening in a direction opposite to the opening direction of the mixed water outlet 2 And a hot water inlet 4 provided above the valve body and partially shown as a front view in FIG. The valve body 1 is also formed with a first valve seat 5 at the mixed water outlet 2 portion, a second valve seat 6 at the hot water inlet 4 portion, and a third valve seat 7 at the water inlet 3 portion. The second valve seat 6 provided in the valve holding portion fixed to the hot water inlet facing the first valve seat 5 and the first valve seat is opposed to each other, and the third valve seat 7 is disposed outside the valve body 1. It is formed towards. A pulse motor 8 is fixed to the upper end portion of the valve body 1 with a bolt, and a valve holding portion 10 extending downward from the pulse motor 8 is inserted into the valve body from the upper end opening of the valve body 1.
[0010]
A pipe joint 9 is fixed to the side of the water inlet 3, and as shown in the fluid circuit diagram of FIG. 7, a water inlet 12 connected to the water pipe is provided at the lower end of the pipe joint 9. The heat exchanger side outlet 13 connected to the heat exchanger 42 of the water heater is connected to the water inlet 3 on the side, and the water from the water inlet 12 bypasses the heat exchanger 42. And a water bypass port 14 for supplying to the mixing proportional valve 18. In the embodiment of FIG. 1, a reed switch in which a flow meter 15 is provided in the vicinity of the water inlet 12 and the rotation of the permanent magnet provided on the blade 16 that rotates by receiving the water flow is fixed to the outside of the pipe joint 9. The total water supply is detected by detecting with a hall element or the like.
[0011]
A spindle 11 is accommodated in the valve body 1 so as to be movable up and down and rotatable. A connecting portion 17 formed at the upper end of the spindle 11 is connected to a drive shaft of the pulse motor 8. The connecting portion 17 of the spindle 11 is formed with a male serration, and is fitted so as to be slidable in the vertical direction by a female serration having substantially the same shape formed at the lower end of the drive shaft. A male screw portion 21 is formed on the outer periphery of the lower portion of the connecting portion 17 of the spindle 11 and is screwed with a female screw portion 22 formed on the inner periphery of the valve holding portion 10. In the illustrated embodiment, the pitch of the threads of the male screw portion 21 and the female screw portion 22 is set such that all of the predetermined vertical movement stroke of the spindle 11 is performed by rotating the spindle by 180 degrees to 360 degrees. .
[0012]
At the lower end of the spindle 11, a hot water throttle valve 23 for adjusting the amount of hot water discharged from the valve is formed facing the first valve seat 5 provided at the mixed water outlet 2 portion. A hot water valve 24 as a hot water metering valve provided at the hot water inlet 4 is formed, with the hot water throttle valve 23 formed in the lower part and the hot water valve 24 formed in the upper part with a valve seat contact part. A cam 25 is formed on the shaft between the hot water throttle valve 23 and the hot water valve 24 of the spindle 11, and this cam is formed at about 120 degrees from the maximum height portion to the base circle portion in the embodiment in the figure. Yes.
[0013]
The third valve seat 7 portion at the water inlet 3 of the valve main body 1 supports a shaft support portion 27 having a guide hole 26 at the center by a plurality of support bodies 28 as shown in a partially enlarged view in FIG. A circulation hole 30 through which water can freely flow is formed around the support 28. The guide hole 26 of the shaft support 27, the rod 19 of the water valve 29 as the water metering valve is supported slidably, water valve 29 is formed integrally with the rod 19, at its periphery the valve unit 31 is formed.
[0014]
One end of the rod 19 of the water valve 29 abuts on a cam 25 provided on the spindle 11 in the state shown in FIGS. 1 and 2, and a check valve 33 is slidably supported on the other end of the rod 19. is doing. A spring 36 is contracted between the back surface 34 of the check valve 33 and the back surface 35 of the water valve 29 opposite thereto, whereby the water valve 29 is connected to the third valve seat 7 and the check valve 33 is connected to the pipe joint. 9 are urged in the direction of contacting the fourth valve seats 37 formed in the water bypass holes 14. In the state shown in FIGS. 1 and 2, the check valve 33 is pressed against the fourth valve seat 37 by the spring 36, and the water valve 29 is pressed against the cam 25 by the rod 19 formed integrally therewith. The water valve 29 is separated from the third valve seat 7.
[0015]
In the state shown in FIG. 1 where the mixing proportional valve 18 configured as described above is shown, the spindle 11 is moved upward, and at this time, the cam 25 formed on the spindle 11 moves relative to the rod 19 of the water valve 29. It stops at the most protruding position. As a result, the hot water throttle valve 23 of the spindle is fully opened, the hot water valve 24 is brought into close contact with the second valve seat 6 and fully closed, and the rod 19 is pushed against the spring 36 by the cam 25, so that the water valve 29 The valve portion 31 is farthest away from the third valve seat 7 and is fully open. At this time, if hot water is not used downstream of the hot water supply pipe 41 connected to the mixed water outlet 2, water does not flow out from the mixed water outlet 2, and the inside of the pipe joint 9 and the inside of the valve body 1 are Due to the equal pressure, the check valve 33 is pressed by the spring 36 and is in close contact with the fourth valve seat 37. As for this check valve 33, immediately after using the water heater, there is hot water whose temperature has risen due to residual heat in the heat exchanger, and this hot water is convected through the bypass so that the hot water temperature in the heat exchanger is reduced. It can be prevented from lowering.
[0016]
When the hot water is used in the hot water supply pipe 41 from the state shown in FIG. 1, water flows into the pipe joint 9 from the water inflow hole 12, and one is in the heat exchanger 42 from the heat exchanger side outlet 13 of the pipe joint 9. The other is released from the water bypass hole 14 against the spring 36 by the water pressure, and flows into the valve body 1 from the circulation hole 30 through the periphery of the water valve 29. This state is shown in FIG. At this time, the water flowing into the heat exchanger side does not flow into the mixing proportional valve 18 because the hot water valve 24 is closed. Therefore, a valve (not shown) on the mixed water outlet side is released in this state. Then, only the water from the fully opened water valve 29 flows out from the mixing proportional valve 18. This is shown in FIG. 6 as state A where the drive pulse of the pulse motor 8 is zero and the motor is not operating.
[0017]
Next, when a drive pulse is supplied to the pulse motor 8, the drive shaft of the motor rotates, and the spindle 11 is connected by connecting the connecting portion 17 having the male serration of the spindle 11 inserted in the female serration 20 of the drive shaft. Rotates. Since the serration 20 and the connecting portion of the spindle 11 are non-rotatable and freely connected in the vertical direction, the spindle 11 is lowered by screwing between the female screw portion 22 formed in the valve holding portion 10 and the male screw portion 21 of the spindle 11. Then, the hot water valve 24 moves away from the second valve seat 6 and gradually opens the valve. Further, since the height of the cam 25 contacting the rod 19 of the water valve 29 is lowered by the rotation of the spindle 11, the water valve 29 receives the water pressure on the back surface 35, and further presses the spring 36 by the dynamic pressure of the water flow. The pressure moves to the spindle 11 side along the surface of the cam 25, and the valve portion 31 of the water valve 29 moves to the third valve seat 7 side to perform the valve closing action. Such an operation is performed as the number of pulses to the pulse motor increases, and changes from A to B in FIG. That is, the water is first rapidly squeezed by the water valve 29, and then the change gradually decreases, while the hot water is gradually opened by the hot water valve 24, and the change in the opening is then reduced. As a result, the flow rate of the mixed water mixed with hot water and water changes as shown by the broken line in the figure, but since the amount of heat given to the heat exchanger is constant, the amount of water flowing into the heat exchanger decreases, Even if the temperature rises, the amount of water increases accordingly, so the temperature of the mixed water does not change.Conversely, even if the amount of water flowing into the heat exchanger increases and the temperature of the hot water decreases, the amount of water increases. Since the amount of water decreases only, the temperature of the mixed water does not change, and in any case, the temperature of the mixed water becomes constant.
[0018]
In FIG. 6, since the spindle 11 rotates up to 360 degrees while the motor drive pulse to the pulse motor 8 is from A to C, in the embodiment operating as shown in FIG. The interval is set so that the spindle operates within 120 degrees. By supplying the drive pulse to the pulse motor 6, the spindle 11 rotates and descends as described above. In the embodiment shown in the drawing, the cam 25 is the lowest base circle when the motor drive pulse is B as described above. At this time, the valve portion 31 of the water valve 29 comes into close contact with the third valve seat 7 and stops supplying water. On the other hand, the hot water valve 24 has reached a substantially maximum opening degree at which the flow rate does not increase even if it is opened further. The hot water throttle valve 23 gradually approaches the first valve seat 5, but is sufficiently far from the first valve seat 5, so that the substantial valve operation is not performed and the valve closing operation is not performed. This position of each valve is shown in FIG. 4 and is shown as position B in FIG. That is, in FIG. 6, the flow rate of water becomes zero when the water valve is fully closed, and the flow rate of hot water does not increase even when the hot water valve is opened further. Enter an area that does not change .
[0019]
Further, when a drive pulse is supplied to the pulse motor, the above-mentioned state of the fully closed state of the water valve 29 and the substantially fully open state of the hot water valve 24 does not change, whereas the hot water throttle valve 23 is moved to the first valve seat 5. Because of the proximity, the amount of hot water not mixed with water from the mixed water outlet 2 gradually decreases. This is a state from B to C in FIG. 6, and the number of drive pulses to the pulse motor and the change of the mixed water are in a proportional relationship, and act as a proportional valve. Eventually, as shown in FIG. 5, the tapping throttle valve 23 is in close contact with the first valve seat 5, and the flow rate from the mixed water outlet becomes zero. At this time, the cam 25 has not yet climbed on at least the rod 19 of the water valve 29. Therefore, during the period from A to C in FIG. 6, the rotation of the spindle 11 is within 360 degrees. During the rotation, the spindle 11 moves through the entire stroke from the fully closed state of the hot water valve to the fully closed state of the hot water throttle valve.
[0020]
In the above-described operation from the fully open state of the water valve 29 and the fully closed state of the hot water valve 24 , the amount of mixed water of hot water and water is somewhat between AB in FIG. 6 even if the drive pulse to the motor is changed. There are fluctuations but no major changes. On the other hand, if hot water is present in the heat exchanger immediately after use of the water heater, and the temperature rises due to residual heat, the temperature is detected and the pulse motor is controlled to increase or decrease, Since it always stands by so that it may become a mixed state according to the temperature of a heat exchanger, even if it opens a stopper and uses hot water at any time, mixed hot water can maintain fixed temperature. Therefore, the “cold water sandwich phenomenon” in which the temperature of the shower becomes hot or cold can be solved. Therefore, by detecting the temperature of the mixed water and controlling the drive pulse to the motor according to the output, the temperature of the mixed water can be maintained at a predetermined temperature without a large change in the amount of the mixed water. .
[0021]
Also, between B and C in FIG. 6, the discharge flow rate decreases in proportion to the increase in the drive pulse to the motor, and the amount of water supplied to the heat exchanger that always gives a constant amount of heat decreases. The temperature of hot water from the heat exchanger rises. Between B and C, if the drive pulse to the motor is decreased, the action of course is reversed, and the temperature of the mixed water is lowered. Therefore, for example, in the winter, when the ratio of hot water is maximized and all the hot water is in the state, the mixed water still does not reach a sufficient temperature. Although the amount of hot water decreases, the temperature of the hot water gradually rises to a predetermined desired temperature. Therefore, even during this time, it is possible to maintain the hot water temperature at a predetermined temperature by detecting the hot water temperature and controlling the drive pulse to the motor according to the output.
[0022]
The present invention is not limited to the mixing proportional valve shown in the above embodiment, and it is natural that the basic operation of the present invention can be performed without using the check valve 33, for example. Also, when the check valve 33 is provided, it can be provided in various forms at any location upstream of the water valve 29, and the position of the cam 25 provided on the spindle 11 is between the hot water throttle valve 23 and the hot water valve 24. However, the present invention can be provided at any position. Furthermore, any motor such as a direct current motor can be used without using a pulse motor as the spindle driving device.
[0023]
【The invention's effect】
Since the present invention is configured as described above, the temperature is first adjusted by changing the mixing ratio of water and hot water by the rotation and vertical movement of the spindle 11 by the motor, and the water flow rate is reduced by fully closing the water valve 29. After reaching zero , the amount of hot water can be adjusted by changing the amount of hot water proportionally with the hot water throttle valve 23 , and the temperature of the hot water can be adjusted. The functions of the ratio adjusting valve and the hot water throttle valve 23 for controlling the amount of hot water can be achieved by a single device with a simple configuration, and an inexpensive mixing proportional valve can be obtained. Furthermore, by forming a valve on the spindle 11 , noise due to water flow through the valve can be reduced as compared with a conventional spherical valve or the like.
[0024]
In the case where the check valve 33 is provided at the water inlet 3 , immediately after using the water heater, there is hot water whose temperature has increased due to residual heat in the heat exchanger. It is possible to prevent the temperature of the hot water in the heat exchanger from being lowered by convection. In the case where the check valve 33 is slidably provided at the other end of the rod 19 , the check valve 33 can be integrated with the water valve 29 to reduce the size as a whole. In the case where the spring 36 is contracted between the water valve 29 and the check valve 33 and the water valve 29 is biased toward the third valve seat 7 side and the check valve 33 is biased toward the fourth valve seat 37 side, The single spring 36 can urge both the water valve 29 and the check valve 33 in the closing direction, and not only can the components be made inexpensive but also a small valve device. can do.
[0025]
The pipe joint 9 is connected to the water inlet 3 of the valve body 1, in that arranged water valve 29 and the check valve 33 therebetween, the water valve 29 and a check on the separate part of the valve body 1 and the pipe joint 9 A valve 33 and the like are arranged, and maintenance of these parts becomes easy. In the case where the fourth valve seat 37 that is in contact with the check valve 33 is formed in the pipe joint 9 , the valve seat concentrated on the valve body 1 can be dispersed, and the manufacture thereof becomes easy. In the case where the flow meter 15 is fixed to the water inlet 3 of the pipe joint 9, the entire mixing proportional valve is unitized including the flow meter 15 , which can be downsized and can be easily manufactured. In that form the cam 25 between the pouring throttle valve 23 and the hot water valve 24 of the spindle 11 can effectively utilize the space between the hot water throttle valve 23 and the hot water valve 24, the whole mixture proportional valve be downsized it can. In the case where the pulse motor 8 is used as the spindle driving device, the mixing ratio control of hot water and water and the proportional control of the tapping throttle valve 23 can be accurately performed.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a non-water passage state of an embodiment of the present invention.
FIG. 2 is a partially enlarged sectional view of the embodiment.
FIG. 3 is a cross-sectional view of an essential part showing the operation of the embodiment of the present invention, showing a water flow state in which a hot water valve is fully closed, a water valve is fully opened, and a tapping valve is fully opened.
FIG. 4 shows the water flow state when the hot water valve is fully open, the water valve is fully closed, and the tapping valve is fully open.
FIG. 5 shows a non-water-passing state when the hot water valve is fully open, the water valve is fully closed, and the tapping throttle valve is fully closed.
FIG. 6 is a flow characteristic diagram of the mixing proportional valve of the present invention.
FIG. 7 is a fluid circuit diagram of an example to which the mixing proportional valve of the present invention is applied.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Valve body 2 Mixed water outlet 3 Water inlet 4 Hot water inlet 5 1st valve seat 6 2nd valve seat 7 3rd valve seat 8 Pulse motor 9 Fitting 10 Valve holding part 12 Water inlet 13 Heat exchanger side outlet 14 Water bypass Port 15 Flow meter 16 Blade 11 Spindle 17 Connection portion 18 Proportional proportional valve 19 Rod 20 Serration 21 Male screw portion 22 Female screw portion 23 Hot water throttle valve 24 Hot water valve 25 Cam 26 Guide hole 27 Shaft support portion 28 Support body 29 Water valve 30 Flow hole 31 Valve portion 32 Orifice 33 Check valve 34 Back surface 35 Back surface 36 Spring 37 Fourth valve seat

Claims (5)

A spindle provided with a tapping valve, a hot water valve, and a cam formed between the hot water throttle valve and the hot water valve;
A mixed water outlet, a hot water inlet, a water inlet, a first valve seat provided at the mixed water outlet, a second valve seat provided at a valve holding portion fixed to the hot water inlet opposite the first valve seat, and the water A valve body provided with a third valve seat provided at the inlet;
A mixing proportional valve comprising a rod and a water valve provided with a valve portion, which is slidably supported with respect to the valve body and is urged so that one end abuts against the cam of the spindle,
As the spindle rotates, the water valve moves to the close side, which is in close contact with the third valve seat, and at the same time, the spindle moves in the axial direction so that the hot water valve separates from the second valve seat. And the mixing ratio of the hot water and water is changed, the water valve is fully closed and the hot water valve is fully opened, and then the hot water throttle valve is close to the first valve seat to start the closing operation , A mixing proportional valve characterized in that the tapping valve and the cam are set so that the amount of tapping is reduced by further movement of the spindle in the axial direction. The mixing proportional valve according to claim 1, wherein a check valve is provided at the water inlet. Mixing the proportional valve according to claim 2, characterized by being provided slidably said check valve to the other end of the rod. Connecting the pipe joint provided with a fourth valve seat provided to face the third valve seat to the water inlet of said valve body, that formed by placing the check valve and the water valve therebetween mixing the proportional valve according to any one of claims 2 to 3, characterized. And it provided under compression spring between said water valve the check valve, the water valve in the third valve seat side, characterized in that biases the check valve to said fourth valve seat side The mixing proportional valve according to claim 4 .

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