JPH05143171A - Device for mixing hot water and water - Google Patents

Abstract

PURPOSE:To improve temperature stability and reliability by arranging a temperature sensor just behind a water stop valve in a hot water/water mixing device for mixing a hot water and water to obtain a proper temperature. CONSTITUTION:Since the temperature sensor 29 for detecting a mixed water temperature is arranged just behind the water stop valve 17 arranged on the downstream of a mixing valve 12, hot water/water mixing is accelerated by contraction through the valve 17, an accurate mixed water temperature can be detected, and at the time of stopping hot water discharge, original pressure (water stop pressure) is not directly applied to the sensor 29.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot and cold water mixing apparatus for mixing hot water and water to obtain an appropriate temperature.

[0002]

2. Description of the Related Art Conventionally, this kind of hot and cold water mixing apparatus has been shown in FIG. In FIG. 2, a mixing valve 1 for adjusting a mixing ratio of hot water and water, a mixing valve drive device 2 for driving the mixing valve 1, and a hot water temperature sensor 3 provided downstream of the mixing valve 1 for detecting a mixed hot water temperature. The mixed hot water temperature setting device 4 for setting the mixed hot water temperature, the flow control valve 5 for adjusting the mixed hot water amount, the flow control valve driving device 6 for driving the flow hot water control valve 5, and the mixed hot water temperature setting device 4. The hot water temperature set value is compared with the signal from the hot water temperature sensor 3, and the mixing valve 1 is controlled via the mixing valve drive device 2 according to the deviation, and the flow rate control valve 5 is controlled via the flow rate control valve drive device 6. It is composed of a controller 7 for controlling (see, for example, Japanese Patent Laid-Open No. 61-124780).

[0003]

However, since the hot water temperature sensor 3 is provided in front of the flow rate adjusting valve 5 in the above configuration, when the flow rate adjusting valve 5 is closed and hot water is stopped, the internal pressure rises to a high pressure. Therefore, the hot water temperature sensor 3 has to have a sufficient pressure resistance structure and is expensive. Further, in order for the hot water temperature sensor 3 to accurately detect the temperature of the mixed water, a new resistance element such as an orifice or the like immediately before the hot water temperature sensor 3 that can sufficiently promote the mixing of hot water and water is required. There were problems such as large pressure loss and inability to obtain a large flow rate.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a hot and cold water mixing apparatus having high reliability without complicating the structure.

[0005]

In order to solve the above problems, a hot and cold water mixing apparatus of the present invention comprises a mixing valve for mixing hot water and water to obtain an appropriate temperature, and a mixing valve driving device for driving the mixing valve.
An independent water stop valve provided downstream of the mixing valve for stopping the appearance of the mixed water, a temperature sensor provided immediately after the secondary side of the water stop valve for detecting the temperature of the mixed water, and a state quantity of the mixed water. And a controller for controlling the mixing valve via the mixing valve drive device by the signal of the temperature sensor based on the state quantity set by the setting device.

[0006]

With the above construction, the controller changes the valve opening of the mixing valve through the mixing valve drive device while feeding back the signal of the temperature sensor so that the temperature becomes equal to the temperature set by the setting device. The temperature sensor can detect the temperature of the mixed water immediately after the secondary side of the water shutoff valve, without receiving high pressure on the water shutoff valve, and the water shutoff valve has a function of promoting the mixing.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a sectional view of a hot and cold water mixing apparatus according to an embodiment of the present invention. In FIG. 1, 11 is a valve housing having a hot water flow path 8, a water flow path 9, and one outflow path 10. A mixing valve 12 for adjusting a mixing ratio of hot water and water is provided in the valve housing 11, and a first solenoid 14 and a first valve 14 are provided as a mixing valve driving device 13 for driving the mixing valve 12.
The solenoid 14 has a first plunger 15 which is driven by energizing the solenoid 14, and the first plunger 15 is configured to interlock with the mixing valve 12. The mixing valve 12
The hot and cold water whose flow rate ratio has been adjusted in step 6 hits and mixes in the mixing chamber 16. Immediately after this mixing chamber 16, there is a water shutoff valve 17, the structure of which is provided with a first diaphragm 18, and a first backpressure which is partitioned while the first diaphragm 18 is in slight communication with the primary side thereof. Due to the pressure difference with the chamber 19, the first
The first diaphragm 18 is integral with the water shutoff valve 17 and directly comes into contact with or comes off from the valve seat 20. The first diaphragm 18 is provided with a first spring 21 that urges the first diaphragm 18 in a direction in which it abuts against the first valve seat 20. To open and close the water shutoff valve 17, a first communication hole 22 that communicates the first back pressure chamber 19 and the secondary side of the water shutoff valve 17, and a pilot that opens and closes the first communication hole 22. There is a valve 23, and this pilot valve 23 is connected to a second plunger 25 via a shaft 24, and a second spring for urging the pilot valve 23 in the direction of closing the first communication hole 22. 26 is provided behind the second plunger 25. The second plunger 25 is configured to slide in a pipe 28 whose one end face is closed by energizing the second solenoid 27. Further, a temperature sensor 29 for detecting the temperature of the mixed water is provided downstream of the water shutoff valve 17 immediately after the first valve seat 20, and further downstream thereof, a conical control valve body 30 for adjusting the flow rate and a corresponding control valve body 30 are provided. Two valve seats 31 are provided. The outer diameter of the control valve body 30 is the second valve seat 31.
The diameter of the valve seat 31
Is smaller than the caliber of. In order to balance the control valve body 30 and the primary pressure of the fluid, a second diaphragm 32 having a groove as a flexible pressure receiving body is connected between the control valve body 30 and the valve casing 11, Further, the groove 32a is deepened so that the effective pressure receiving area is always equal to the diameter of the second valve seat 31 regardless of the lift amount of the control valve body 30. The second back pressure chamber 33, which is completely partitioned from the primary side by the second diaphragm 32, and the secondary side of the control valve body 30 communicate with each other through a second communication hole 34. The control valve element 30 is biased by a third spring 35 in a direction in which it abuts on the second valve seat 31. The shaft 24 passes through the centers of the control valve body 30 and the second diaphragm 32, and the second plunger 2
5, the control valve body 30, the second diaphragm 32, and the pilot valve 23 are arranged in this order, the pilot valve 23 is lifted with the lift of the second plunger 25, and the control valve body 30 is subsequently lifted. It is configured to do. Further, the temperature sensor 2 is set based on the setter 36 for setting the state quantity of the mixed water and the state quantity set by the setter 36.
It is composed of a mixing valve drive device 13, that is, a controller 37 that controls the amount of electricity supplied to the first solenoid 14 in accordance with the signal 9 and controls the amount of electricity supplied to the second solenoid 27 in accordance with the set flow rate. ..

The operation of the above configuration will be described below. First, when the setting device 36 is instructed to discharge the mixed water, the controller 37 causes the second
An electric current is applied to the solenoid 27. Then, the second plunger 25 is attracted against the second spring 26, and the pilot valve 23 opens the first communication hole 22. And
The primary side sandwiching the first diaphragm 18 and the first back pressure chamber 1
Due to the pressure difference of 9, the first diaphragm 18, that is, the water shutoff valve 17 is lifted against the first spring 21, and hot water discharge is started. When the current value is further increased, the control valve body 30 is lifted, the opening is enlarged, and the flow rate is increased. That is, the flow rate is adjusted by lifting the control valve body 30 to an arbitrary position depending on the magnitude of the value of the current flowing to the second solenoid 27. In addition, when stopping the hot water,
When the current to the second solenoid 27 is cut off, the second plunger 25 is pushed out by the second spring 26, the control valve body 30 is closed, and at the same time, the pilot valve 23 closes the first communication hole 22. Thereby the first diaphragm 1
The pressure difference between the primary side and the first back pressure chamber 19 sandwiching 8 is eliminated, and the water shutoff valve 17 is closed due to the difference in pressure receiving area.

On the other hand, during hot water discharge, the controller 37 feeds back the signal from the temperature sensor 29 so that the temperature becomes equal to the temperature set by the setting device 36, and controls the amount of electricity to the first solenoid 14 to control the mixing valve. The valve opening degree of 12 is changed to adjust the flow rate of hot and cold water to obtain a desired temperature.

As described above, in the embodiment of the present invention, the temperature sensor 29 is provided on the secondary side of the water shutoff valve 17, which is also the first valve seat 20.
Since it is provided immediately after, the first valve seat 20 serves as an orifice for promoting mixing, and it is possible to detect the temperature of the mixed water accurately and with little fluctuation, and to easily and stably control the temperature. Can be done by Also, the temperature sensor 2
Since 9 is on the secondary side of the water shutoff valve 17, the original pressure (water shutoff pressure) is not applied to the temperature sensor 29 even when hot water is stopped,
The pressure sensor of the temperature sensor 29 itself, the mounting configuration, and the like are facilitated, and low cost and improved reliability are realized. Further, since the temperature sensor 29 is on the secondary side of the water shutoff valve 17, there is no temperature fluctuation at the time of tapping again due to the effect of convection in the mixing chamber 16 that occurs when it is on the primary side when stopped, and a stable temperature is maintained. Can be supplied. When the tap water is stopped, before the water shutoff valve 17 is closed, the control valve element 30 located downstream of the hot water shutoff valve 17 comes into contact with the corresponding second valve seat 31 to stop the flow. In the flow path near the temperature sensor 29 provided, since the mixed water stays without being discharged even when the water is stopped,
The surface of the detection part of the temperature sensor 29 does not come into contact with air and dries, so that scales are not deposited, and the sensitivity is not deteriorated by oxidation, so that the reliability is high.

[0011]

As described above, according to the hot and cold water mixing apparatus of the present invention, the following effects can be obtained. (1) Since the temperature sensor is provided immediately after the secondary side of the water shutoff valve, the water shutoff valve causes the mixed water to contract and promote mixing, so that the temperature of the mixed water can be detected accurately and with little fluctuation. Therefore, temperature control can be performed easily and stably.
Further, the original pressure (water stop pressure) is not applied to the temperature sensor even when the temperature sensor is stopped, the pressure sensor of the temperature sensor itself, the mounting structure, etc. are easy, and the cost and reliability are improved. (2) Since the mixed water stays near the temperature sensor without being discharged even when the water is stopped, the surface of the detection part of the temperature sensor may come into contact with air to dry and deposit scale, or oxidize to deteriorate sensitivity. Nor.

[Brief description of drawings]

FIG. 1 is a sectional view of a hot and cold water mixing apparatus according to an embodiment of the present invention.

FIG. 2 is a sectional view of a conventional hot and cold water mixing device.

[Explanation of symbols]

 12 Mixing valve 13 Mixing valve drive device 17 Water stop valve 29 Temperature sensor 36 Setting device 37 Controller

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Bunichi Shiba 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] 1. A mixing valve that mixes hot water and water to obtain an appropriate temperature, a mixing valve drive device that drives the mixing valve, and an independent water stop provided downstream of the mixing valve to stop the discharge of the mixed water. Valve, a temperature sensor provided immediately after the secondary side of the water shutoff valve for detecting the temperature of the mixed water, a setter for setting the state quantity of the mixed water, and a state quantity set by the setter, A hot and cold water mixing device comprising a controller for controlling the mixing valve via a mixing valve driving device in response to a signal from the temperature sensor. 2. The hot and cold water mixing apparatus according to claim 1, wherein the mixed water stays in the flow passage near the temperature sensor provided on the secondary side of the water shutoff valve even when the water is shut off.