JP4046459B2 - Hot water mixing valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hot and cold water mixing valve, and more particularly to a hot and cold water mixing valve in which hot hot water and cold water are mixed in a hot water supply device to obtain an appropriate temperature hot water.
[0002]
[Prior art]
FIG. 6 is a diagram illustrating a first configuration example of the hot water supply apparatus. According to the first configuration example, the water supply pipe 1 to which water is supplied is connected to the heat exchanger 2 and the bypass control valve 3, and the downstream side of the heat exchanger 2 and the bypass control valve 3 is a hot water control. It is connected to a hot water discharge pipe 5 through a valve 4.
[0003]
The water supplied by the water supply pipe 1 is supplied to the heat exchanger 2 and also to a bypass control valve 3 arranged so as to bypass the heat exchanger 2. The water supplied to the heat exchanger 2 is heated by the combustion heat generated by the burner 6 and outputs hot water. The bypass control valve 3 is an on / off valve that controls the temperature of the hot water by adjusting the amount of water mixed with the hot water output from the heat exchanger 2. The hot water control valve 4 controls the amount of hot water discharged from the hot water pipe 5.
[0004]
FIG. 7 is a diagram showing the flow rate characteristics of the hot water supply apparatus. This flow rate characteristic shows the change in the total amount of water, the amount of hot water, and the total amount of water and hot water generally required for a hot water supply device. The horizontal axis represents the control area of hot water and water, and the vertical axis Represents the flow rate. The flow rate characteristic of the hot water supply device has a mixing region where water and hot water are mixed and discharged, and a hot water side control region where only hot water is controlled. The position of the maximum flow rate in the mixing area is indicated by a, and the position of the maximum flow rate of hot water is indicated by b.
[0005]
Such a flow rate characteristic is realized by controlling the bypass control valve 3 and the hot water control valve 4 of FIG. That is, in the mixing region, both the bypass control valve 3 and the hot water control valve 4 are controlled so that the total flow rate changes linearly, and the bypass control valve 3 is moved from the position a in the mixing region to the position b in the hot water control region. The total hot water flow rate is controlled only by the hot water control valve 4 in the hot water side control region. Although not shown, the heating power of the burner 6 and the valve opening of the bypass control valve 3 and the hot water control valve 4 are controlled based on the feed water flow rate, the feed water temperature, the heat exchanger outlet temperature, and the hot water temperature.
[0006]
FIG. 8 is a diagram illustrating a second configuration example of the hot water supply apparatus. According to this second configuration example, the water supply pipe 1 to which water is supplied is connected to the heat exchanger 2 and is connected to the water supply port of the hot water mixing valve 7, and the downstream side of the heat exchanger 2 is The hot water mixing valve 7 is connected to a hot water outlet, and the hot water mixing valve 7 has a hot water outlet connected to a hot water pipe 5.
[0007]
The water supplied by the water supply pipe 1 is supplied to the heat exchanger 2, heated by the combustion heat from the burner 6, and output. The hot water mixing valve 7 receives water at its water supply port, receives hot water from the heat exchanger 2 at its hot water supply port, controls the amount of hot water passed and the amount of water bypass, and sends it out to the hot water outlet pipe 5. In this way, by controlling the mixing ratio and the total flow rate with one hot and cold water mixing valve 7, flow rate characteristics as shown in FIG. 7 are obtained.
[0008]
Here, the flow control of the hot / cold water mixing valve 7 will be described. The hot and cold mixing valve 7 has water and hot water valve bodies, and the flow rate of water and hot water is controlled by raising and lowering the valve bodies in the valve shaft direction so that the valves open and close with respect to the respective valve seats. The total flow rate is controlled. The valve body is provided with a notch in a part of the periphery thereof, and a space is formed between the notch and the side wall of the housing that houses the valve body, and the space and the side wall of the housing are formed. Water that bypasses the heat exchanger 2 is passed through a slit provided so as to extend in the valve axis direction, and goes to the valve body for water. In the flow characteristics shown in FIG. 7, the transition from the position “a”, which is the fully open position of the water in the mixing area where the amount of water is being reduced, to the position “b” of the hot water side control area, which is the fully closed position of water, , And the notch is moved to a position not aligned with the slit to close the slit with a valve body.
[0009]
[Problems to be solved by the invention]
However, in the conventional hot water supply apparatus, in the configuration using the bypass control valve and the hot water control valve, since two control valves are required, there is a problem that the cost increases and the layout becomes very large. there were.
[0010]
In the configuration using one hot and cold water mixing valve, in the water-side control, switching from the fully open position a to the fully closed position b is performed by rotating the valve body and closing the slit through which water passes. Therefore, there is a problem that the water passing sound at the time of closing the slit becomes high.
[0011]
Furthermore, since the ratio of hot and cold water is constant in the mixing region of the flow rate characteristics, when the temperature of hot water changes suddenly, the valve cannot respond immediately, and hot water at an unexpected temperature comes out. There was a problem such as.
[0012]
The present invention has been made in view of the above points, and is a hot and cold water mixing valve that can be configured with a single control valve. An object of the present invention is to provide a hot and cold water mixing valve that can cope with the above.
[0013]
[Means for Solving the Problems]
In the present invention, in order to solve the above problem, in a hot water mixing valve that mixes hot water supplied to a hot water supply port and water supplied to the water supply port and sends the mixed water to the hot water outlet, The hot water flow rate is controlled in such a way that the flow rate of hot water supplied to the hot water supply port is increased to the maximum flow rate in the mixing region and decreased from the maximum flow rate in the hot water side control region. The flow rate of water supplied to the water supply port is reduced from a predetermined amount of water in the mixing region in accordance with the moving direction of the water valve body, disposed in a passage between the side control valve and the water supply port and the hot water outlet. After that, the maximum flow rate is increased, the maximum flow rate is switched to the minimum flow rate, and the hot water side control area is controlled to maintain the minimum flow rate, and the switching from the maximum flow rate to the minimum flow rate is performed on the water valve body. As with axial movement And water-side control valve, wherein the hot water-side control valve, a hot water valve seat formed in the passage between the hot water supply port and the outflow position, through arranged the said hot water valve seat A hot water valve body having a constricted shape in the center so that the gap between the hot water valve control zone and the hot water valve seat becomes the largest at the time of maximum flow rate control of the hot water side control region, A water valve seat comprising a first valve seat portion having a small passage diameter on the upstream side and a second valve seat portion having a large passage diameter on the downstream side, disposed in a passage between the water supply port and the outlet port; The first valve body portion is controlled to increase to the maximum flow rate after being reduced from a predetermined amount of water in the mixing region by penetrating the first valve seat portion in the axial direction, and after the control to the maximum flow rate, A water valve body comprising a second valve body portion for performing switching control to the minimum flow rate in cooperation with the second valve seat portion; Hot and cold water mixing valve, characterized in that it comprises is provided.
[0014]
According to such a hot and cold water mixing valve, in the water volume control on the water side, the switching from the maximum flow rate to the minimum flow rate is performed by moving the water valve body in the axial direction, thereby eliminating the concentration of water flow when the valve is closed. , It is possible to avoid a high water flow noise. In the mixing region, the temperature of the hot water supplied at the start of the control is high by flowing a predetermined amount of water at the start of the movement of the water valve body, that is, by controlling the water mixing ratio to be high. Even if it is supplied in a state, it becomes possible to suppress high-temperature hot water at the start of hot water.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view showing the configuration of a hot and cold water mixing valve according to the present invention.
[0016]
The hot water / water mixing valve according to the present invention is connected to a water supply port 11 to which a water supply pipe for supplying water is connected, a hot water supply port 12 to which a pipe for supplying hot water from a heat exchanger is connected, and a pipe for feeding out hot / cold water. It has a cylindrical body 14 in which a hot water outlet 13 is formed. A shaft 15 extending in the longitudinal direction is disposed at the center of the body 14. The shaft 15 is accommodated in the housing 16 and screwed into a screw portion 17 formed in the housing 16 so that the shaft 15 can move in the axial direction while rotating. A valve body 18 is provided at the lower end of the shaft 15. In the valve body 18, an upper water valve body 19 and a lower hot water valve body 20 are integrally formed. The water valve body 19 is composed of a small-diameter portion that controls the amount of water and a large-diameter portion that shuts down the water-side passage, and the hot water valve body 20 has a constricted shape in the form of a bobbin. A water valve seat 21 is disposed in a passage in the body 14 between the water supply port 11 and the hot water outlet 13. This water valve seat 21 is located in the center and on the side of the passage leading to the first valve seat portion constituting the valve that controls the amount of water in cooperation with the small diameter portion of the water valve body 19, and the hot water outlet 13. It consists of a second valve seat portion that constitutes an on / off valve for the water-side passage in cooperation with the large-diameter portion of the water valve body 19. A hot water valve seat 22 constituting a valve for controlling the amount of hot water in cooperation with the hot water valve body 20 of the valve body 18 is provided in the passage in the body 14 between the hot water inlet 12 and the hot water outlet 13. 14 and a single unit. An actuator 23 that rotates the shaft 15 is disposed at the upper end of the shaft 15.
[0017]
In the hot and cold water mixing valve having the above-described configuration, the actuator 23 rotates and drives the upper end portion of the shaft 15, so that the shaft 15 is screwed into the screw portion 17 of the housing 16 and moves in the axial direction. 18 moves so that the flow rate of hot water and water can be controlled.
[0018]
FIG. 2 is a diagram showing the flow rate characteristics of the hot and cold mixing valve. This flow rate characteristic shows the change in the total flow rate of water volume, hot water volume, and water and hot water generally required for a hot water supply device. The horizontal axis represents the rotation angle of the shaft 15 or the stroke of the valve body 18. And the vertical axis represents the flow rate. The flow rate characteristic of the hot water supply device has a mixing region where water and hot water are mixed and discharged, and a hot water side control region where only hot water is controlled. In addition, the valve position of the maximum flow rate in the mixing region is indicated by a, and the valve position of the maximum flow rate of hot water is indicated by b.
[0019]
The most characteristic of this flow rate characteristic is the characteristics of the mixing region. That is, the mixing area has a variable hot water ratio area and a constant hot water ratio area. In the hot water ratio variable region, the flow rate change of hot water has the same change tendency as before, but the change in water flow rate has a small amount of water at a small valve stroke position, and the valve stroke is large. As it becomes, the water volume is reduced.
[0020]
Thereafter, in the region where the hot water ratio is constant in the mixing region, the hot water and water mixing ratio is substantially constant as the valve stroke increases, and water is shut down from the valve position a to the valve position b. In a large area, it becomes a hot water side control area where only the amount of hot water is controlled.
[0021]
Next, the operation of the hot and cold water mixing valve will be described in light of the flow rate characteristics of the hot and cold water mixing valve.
First, in the valve stroke minimum position A in which the valve element 18 is lowered to the lowest position, as shown in FIG. 1, the hot water valve element 20 of the valve element 18 is closed, but the water valve element 19 of the valve element 18 is closed. Is located in the outlet 13 side passage of the water valve seat 21, and the water side valve is slightly open. As a result, the water that has passed through the water-side valve and the hot water that has leaked from the hot-water side valve are mixed and discharged from the hot water outlet 13 side passage. In terms of the total flow rate, it comes out more from the water side.
[0022]
Next, when the valve body 18 is raised by the rotational drive of the shaft 15 by the actuator 23, the water valve body 19 of the valve body 18 approaches the water valve seat 21, so that the valve opening gradually decreases. Therefore, the amount of water is reduced. On the other hand, the hot water valve body 20 of the valve body 18 gradually increases in valve opening and increases the amount of hot water when the pinched neck portion of the valve body 18 approaches the hot water valve seat 22. Go.
[0023]
FIG. 3 is a cross-sectional view of the hot water / water mixing valve showing a starting position where the hot water / water ratio is constant in the mixing region.
At the start position B where the hot water ratio in the mixing region is constant, the small diameter portion of the water valve body 19 of the valve body 18 is at the position of the first valve seat portion of the water valve seat 21, and the amount of water leaks from this valve portion. It becomes only. On the other hand, with respect to the hot water valve body 20 of the valve body 18, the valve opening gradually increases and the amount of hot water increases almost linearly.
[0024]
Thereafter, as the valve body 18 rises, the small diameter portion of the water valve body 19 of the valve body 18 moves away from the position of the first valve seat portion of the water valve seat 21, so that the valve opening degree here is It gradually increases and the water volume increases almost linearly. At the same time, the valve opening on the hot water side gradually increases and the amount of hot water also increases.
[0025]
After that, at the valve position a where the constant hot water ratio of the mixing region ends, the large diameter portion of the water valve body 19 of the valve body 18 approaches the second valve seat portion of the water valve seat 21 and the water The passage area of the orifice between the large diameter portion of the valve body 19 and the second valve seat portion of the water valve seat 21 is between the small diameter portion of the water valve body 19 and the first valve seat portion of the water valve seat 21. The valve position a is in the fully open state of the water side valve.
[0026]
When the valve body 18 is further raised, the passage area of the orifice between the large-diameter portion of the water valve body 19 and the second valve seat portion of the water valve seat 21 is reduced, and the amount of water is rapidly reduced. . Since the inner diameter of the second valve seat portion of the water valve seat 21 is considerably larger than the inner diameter of the first valve seat portion, the larger diameter portion of the water valve body 19 is the second valve seat portion of the water valve seat 21. Until it approaches immediately before, basically, only the water amount control by the small diameter portion of the water valve body 19 and the first valve seat portion of the water valve seat 21 is performed. Therefore, the valve formed by the large-diameter portion of the water valve body 19 and the second valve seat portion of the water valve seat 21 has a very large passage area, so that a large flow rate can flow even with a very small orifice. The water side passage can be instantly closed with a small stroke of the valve body 18. At this time, since the water-side passage flows over the entire circumference of the second valve seat portion of the water valve seat 21 until the water-side passage is fully closed, the water-flowing sound generated by the local flow is greatly reduced.
[0027]
FIG. 4 is a cross-sectional view of the hot water / water mixing valve showing the start position of the hot water side control region.
When the large-diameter portion of the water valve body 19 reaches the inlet position of the second valve seat portion of the water valve seat 21, the water-side valve takes the valve position b that is fully closed, and from here the hot water side control region Is started. When at the start position C of the hot water side control region, on the hot water side, the passage area of the orifice between the hot water valve body 20 and the hot water valve seat 22 of the valve body 18 is maximized, and the hot water side The valve is fully open.
[0028]
When the valve body 18 is further raised, the large-diameter portion of the water valve body 19 is fitted into the second valve seat portion of the water valve seat 21, so that the water-side valve maintains the fully closed position. However, since the passage area of the orifice between the hot water valve body 20 and the hot water valve seat 22 of the valve body 18 gradually decreases from the fully opened state, the valve opening of the hot water side valve gradually decreases. However, the amount of hot water decreases almost linearly.
[0029]
FIG. 5 is a sectional view of the hot and cold water mixing valve showing the end position of the hot water side control region.
Then, when the valve body 18 reaches the end position D of the hot water side control region, which is the maximum valve stroke position, as shown in FIG. 5, the water side valve is fully closed and the hot water side valve is also fully closed. Thus, only the hot water leaked from the hot water side valve comes out into the hot water outlet 13 side passage.
[0030]
【The invention's effect】
As described above, according to the present invention, in the hot and cold water mixing valve constituted by one control valve, a direct acting valve is arranged in the water side passage so that the water side passage is closed. As a result, the water flowing when the valve is closed does not concentrate in one place, but is distributed over the outer periphery of the valve body, so that the flow noise is reduced and the hot water mixing valve can be made quieter. .
[0031]
Further, in the flow rate characteristics, a region where the hot water ratio is variable is provided in the mixing region where the hot water ratio is constant, and the flow is such that the water ratio is increased at the minimum valve stroke position. Thereby, it becomes possible to cope with a sudden temperature change. For example, in a hot water supply apparatus having a cooking function, there is a type having a single heat exchanger and two system paths for hot water and cooking. In such a type, if you use the additional cooking function and switch to using both additional cooking and hot water from the middle, the water in the hot water side that shares the heat exchanger will be Since it has already been hot, the hot water at the beginning of the hot water side becomes hot hot water. In the hot and cold water mixing valve of the present invention, by increasing the ratio of water, it is possible to suppress high temperature hot water at the beginning of discharge, and it is possible to avoid the occurrence of hot hot water at the beginning of the discharge of hot water.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing the configuration of a hot and cold water mixing valve according to the present invention.
FIG. 2 is a view showing a flow rate characteristic of a hot and cold mixing valve.
FIG. 3 is a cross-sectional view of a hot / cold water mixing valve showing a starting position where the hot water / water ratio is constant in the mixing region.
FIG. 4 is a cross-sectional view of a hot and cold water mixing valve showing a start position of a hot water side control region.
FIG. 5 is a cross-sectional view of the hot and cold water mixing valve showing the end position of the hot water side control region.
FIG. 6 is a diagram illustrating a first configuration example of a hot water supply apparatus.
FIG. 7 is a view showing a flow rate characteristic of a hot water supply device.
FIG. 8 is a diagram illustrating a second configuration example of the hot water supply apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Water supply port 12 Hot water supply port 13 Hot water outlet 14 Body 15 Shaft 16 Housing 17 Screw part 18 Valve body 19 Water valve body 20 Hot water valve body 21 Water valve seat 22 Hot water valve seat 23 Actuator

Claims (3)

In the hot and cold water mixing valve that mixes the hot water supplied to the hot water inlet and the water supplied to the hot water outlet and sends it to the hot water outlet.
Wherein disposed in the passage between the hot water port and the outflow position, the increases to a maximum flow rate the flow rate of the hot water supplied to the hot water inlet in the mixing area according to the movement direction of the hot water valve element, the hot water side control frequency Then, a hot water side control valve that controls to decrease from the maximum flow rate,
A maximum flow rate after the flow rate of water supplied to the water supply port is reduced from a predetermined amount of water in the mixing region according to the moving direction of the water valve body, disposed in a passage between the water supply port and the tap port. until increases, further changes from maximum flow to minimum flow Rikae, in the hot water side control area and controls to hold the minimum flow, from said maximum flow rate switching Rikae to minimum flow rate of the cold water valve body shaft A water-side control valve that is configured to move by direction,
Equipped with a,
The hot water control valve includes a hot water valve seat formed in a passage between the hot water supply port and the hot water outlet, and a hot water valve seat that is disposed through the hot water valve seat during maximum flow rate control in the hot water control region. A hot water valve body having a thread-wound shape with a constricted center so that the gap between the hot water valve seat is the largest,
The water-side control valve is disposed in a passage between the water supply port and the hot water outlet, and a first valve seat portion having a small passage diameter on the upstream side and a second valve seat portion having a large passage diameter on the downstream side. A water valve seat comprising: a first valve body portion that performs control to increase the maximum flow rate after reducing the predetermined water amount in the mixing region by penetrating the first valve seat portion in the axial direction; And a water valve body comprising a second valve body portion that performs switching control to the minimum flow rate in cooperation with the second valve seat portion after the control to the maximum flow rate. Mixing valve. The hot and cold water mixing valve according to claim 1, wherein the hot water valve body and the water valve body are integrally formed. 3. The hot and cold water mixing valve according to claim 2, wherein the hot water valve body and the water valve body are attached to a shaft arranged in an axial direction so as to be reciprocally movable by an actuator.

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