JPH06129551A - Temperature adjusting device of hot water supply device - Google Patents

Abstract

PURPOSE:To provide a temp. adjusting device for hot water supply device which presents a high response speed and whose throttle valve driving part can be accomplished at a low cost. CONSTITUTION:A temp. adjusting device for hot water supply device is provided which is equipped with a throttle valve for throttling the amount of cold water inflowing from a cold water supply pipe 1 to a heating part 7 when the specified temp. level is not attained by the temp. of a hot water which is obtained by heating the cold water from the pipe 1 by the heating part 7. The throttle valve 10 is formed as capable of advancing and retreating in the axial direction so that the cold water passing area is varied by straight motions, and piping is arranged so that the pressure of cold water before passing the heating part 7 and the pressure of hot water after passing the heating part are applied separately on the front and rear of the throttle valve 10, which 10 is driven by a solenoid 14 as capable of advancing and retreating in the axial direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a hot water supply temperature adjusting device for a hot water supply device.

[0002]

2. Description of the Related Art A hot water supply temperature adjusting device of a hot water supply apparatus includes a variable mixing valve for mixing hot water obtained by heating cold water flowing from a water supply pipe with a heating unit with cold water at an appropriate ratio and discharging hot water. A throttle valve for throttling the amount of cold water flowing from the water supply pipe into the heating section when the temperature of the hot water does not reach a predetermined temperature is provided.

When the hot water temperature cannot be maintained at the set temperature even if the cold water side is fully throttled by the variable mixing valve, the throttle valve is throttled to reduce the amount of cold water flowing into the heating section to raise the hot water temperature. I am trying.

Cold water supply water pressure (tap water pressure) acts on the throttle valve used in this way, and the water pressure is 5 to 10 kg.
It's not uncommon to have / cm ² . Therefore, in order to operate the throttle valve, a large force that exceeds its water pressure is required, and the throttle valve is generally driven by a geared motor or the like.

[0005]

However, since the geared motor has many parts, it is expensive and increases the cost of the apparatus, and the reaction speed is slow.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a hot water supply temperature adjusting device for a hot water supply device in which the driving portion of the throttle valve is inexpensive and the reaction speed is fast.

[0007]

In order to achieve the above object, in the hot water supply temperature adjusting device of the hot water supply device of the present invention, the temperature obtained by heating the cold water flowing from the water supply pipe in the heating section reaches a predetermined temperature. In a hot water supply temperature adjusting device of a hot water supply device provided with a throttle valve for throttling the amount of cold water flowing into the heating part from the water supply pipe when it does not reach, the throttling valve changes the passing area of the cold water by linear movement. The pressure of cold water before passing through the heating portion and the pressure of hot water after passing through the heating portion are divided into the front side and the back side of the throttle valve so that It is characterized in that piping is added so that the throttle valve is driven forward and backward in the axial direction by a solenoid.

A variable mixing valve for mixing hot water obtained by heating in the heating section with cold water at an appropriate ratio is provided, and the variable mixing valve is driven forward and backward by a second solenoid. Good.

[0009]

The cold water pressure and the warm water pressure are separately applied to the throttle valve on the front side and the rear side, so that the water pressures from both sides are canceled and the throttle valve is driven forward and backward by a solenoid with a light force.

At this time, assuming that the cold water pressure is P1 and the hot water pressure is P2, the total amount of water G passing through the throttle valve is G = K√ (P1-P2), and the differential pressure between the cold water pressure and the hot water pressure (P1 -P2).

Since the differential pressure (P1-P2) acts on the throttle valve, when f (I) is a function of the current I flowing through the solenoid, P1-P2 = f (I) To establish.

Therefore, the total amount of water passing through the throttle valve G
Becomes G = K√f (I), and is controlled only by the value I of current supplied to the solenoid.

[0013]

Embodiments will be described with reference to the drawings. Figure 1
1 shows the overall configuration of a hot water supply apparatus to which the present invention is applied, in which a water supply pipe 1 connected to a cold water source such as a water pipe is connected to a central inlet 3 of a throttle valve unit 2 arranged in a T shape. .

The first outflow port 4 of the two outflow ports 4, 5 of the throttle valve unit 2 has a hot water conduit 8 passing through a heating unit 7 which uses a gas burner, a petroleum burner, an electric heater or the like as a heat source.
Is connected, and the water supplied from the water supply pipe 1 is heated there to become hot water. Reference numeral 9 denotes a flow rate sensor provided in the hot water conduit 8 on the front side of the heating unit 7 to detect the flow rate of the hot water.

The throttle valve 10 is formed in a conical surface so as to face the valve seat 15, and an intermediate piston portion 10a connected to the rear of the throttle valve 10 by a rod 13 is arranged in the cylinder 11 so as to be movable back and forth in the axial direction. The throttle valve 10, the rod 13 and the intermediate piston 10a integrally move linearly to change the flow passage area of the cold water supplied from the water supply pipe 1.

The water supply pipe 1 is opened between the valve portion of the throttle valve 10 and the intermediate piston portion 10a. In addition, throttle valve 1
0 is the compression coil spring 12 from the outlets 4 and 5 side.
Is urged in the direction of closing the valve by the first solenoid 14 from the back side via the rod 13 against the urging force.

A valve seat 15 facing the conical portion of the throttle valve 10.
And the diameter of the cylinder 11 (that is, the intermediate piston 10a
(Diameter of) and the same size. Also cylinder 1
1, a communication conduit 16 that communicates with the hot water conduit 8 on the front side of the heating unit 7 opens to the back side of the intermediate piston 10a.

Therefore, for the entire throttle valve 10,
The pressure of cold water before passing through the heating unit 7 is applied from the front side, and at the same time, the pressure of hot water after passing through the heating unit 7 is applied from the back side in the same pressure receiving area.

As a result, the cold water pressure and the hot water pressure are separately applied to the front side and the rear side of the throttle valve 10, so that the water pressures from both sides are canceled and the linear movement of the throttle valve 10 in the axial direction is performed. It can be operated by light force.

The throttle valve 10 has a valve opening corresponding to the differential pressure between cold water pressure and hot water pressure, the urging force of the compression coil spring 12, and the value of the current flowing through the electromagnetic coil 14a of the first solenoid 14 that opposes the urging force. Is controlled.

At this time, assuming that the cold water pressure is P1 and the hot water pressure is P2, the total water amount G passing through the throttle valve 10 is G = K√ (P1-P2), and the differential pressure between the cold water pressure and the hot water pressure ( P1-P2) (K is a constant).

Since the differential pressure (P1-P2) acts on the throttle valve 10, when the function of the current I flowing through the electromagnetic coil 14a is f (I), P1-P2 = f (I ) Holds.

Therefore, the total amount G of water passing through the throttle valve 10 is G = K√f (I), and is controlled only by the value I of the electric current supplied to the electromagnetic coil 14a.

Therefore, even if the pressure of the cold water supplied from the water supply pipe 1 fluctuates, the throttle valve 10 is operated by the electromagnetic coil 1
The valve opening degree is automatically changed so as to maintain a constant flow rate that depends only on the current value I supplied to 4a. Reference numeral 14b is a drive circuit (driver) for the electromagnetic coil 14a.

Reference numeral 20 is a variable mixing valve for mixing cold water and hot water at an appropriate ratio. The cold water inlet 22 and the hot water inlet 23, which are T-shaped pipes of the variable mixing valve portion 21, are
Cold water conduit 24 connected to the second outlet 5 of the throttle valve unit 2
And the outlet of the hot water pipeline 8 are connected.

The cold water inlet 22 and the hot water inlet 23
The cold water and the hot water that have flowed into the variable mixing valve section 21 from are mixed at a ratio according to the position of the variable mixing valve 20, and are sent out to the faucet 27 via the mixed hot water outlet 26 in the center of the pipe.

An orifice 28 for narrowing the inner diameter is provided in the middle of the cold water pipe 24, so that the cold water pressure and the hot water pressure applied to the variable mixing valve 20 from both sides become equal. There is.

Reference numeral 31 is a second solenoid for driving the variable mixing valve 20, and the variable mixing valve 20 resists the urging force of the compression coil spring 29 and the second solenoid via the rod 30.
Is pressed by the solenoid 31.

Therefore, the variable mixing valve 20 includes the urging force of the compression coil spring 29 and the second solenoid 3 that opposes the urging force.
It operates so as to stand still at a position where the driving force of 1 is balanced, and the valve position, that is, the mixing ratio of cold water and hot water is controlled in accordance with the value of the current flowing through the electromagnetic coil 31a of the second solenoid 31. 31b is an electromagnetic coil 3 of the second solenoid 31.
1a is a drive circuit (driver).

Reference numeral 35 denotes a control unit having a built-in microprocessor or the like, which has a setting signal from a hot water outlet temperature setting unit 36 for setting the hot water outlet temperature from the faucet 27, a cold water inflow port 22, a hot water inflow port 23 and a mixed hot water flow. The detection temperature signals from the water temperature sensors 37, 38, 39 and the detection flow rate signal from the flow rate sensor 9 and the like provided in each part of the outlet 26 are input to control the operations of the first and second solenoids 14, 31. .

In the apparatus having the above-described structure, the value of the current supplied to the second solenoid 31 is controlled by the control of the controller 35, and the mixed hot water outlet 26
The operation of the variable mixing valve 20 is controlled so that the water temperature of the hot water is set to the set temperature in the hot water temperature setting unit 36.

Then, for example, when the water temperature detected by the sensor 38 provided at the hot water inlet 23 becomes lower than the set temperature of the hot water outlet temperature setting section 36 and the hot water outlet from the tap 27 does not reach the set temperature. , Or when the water temperature at the hot water inlet 23 becomes lower than a predetermined temperature, the controller 35 causes the electromagnetic coil 14 of the first solenoid 14 to operate.
The energizing current to a is controlled so as to reduce the flow rate at the throttle valve 10, the amount of cold water flowing from the water supply pipe 1 to the heating unit 7 is reduced, and the hot water temperature rises.

The present invention is not limited to the above embodiment, but may be applied to, for example, a hot water supply device in which the variable mixing valve 30 is not provided.

[0034]

According to the hot water supply temperature adjusting device of the hot water supply device of the present invention, the cold water pressure before passing through the heating portion and the hot water pressure after passing through the heating portion are divided into the front side and the back side of the throttle valve. Since the water pressure applied to the throttle valve is canceled out, the throttle valve can be driven with a light force by using a solenoid, and a high-speed reaction speed can be obtained by a low-cost device and the throttle valve can be passed. It has an excellent effect that the amount of water can be easily and accurately controlled only by the value of the current supplied to the solenoid.

Further, the variable water mixing valve is also driven by a solenoid, so that the entire hot water supply temperature adjusting device of the hot water supply device can be manufactured at low cost.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment.

[Explanation of symbols]

 1 Water Supply Pipe 7 Heating Part 8 Hot Water Pipeline 10 Throttle Valve 10a Intermediate Piston Part 11 Cylinder 14 First Solenoid 16 Communication Pipeline 20 Variable Mixing Valve 31 Second Solenoid

Claims (2)

[Claims] 1. A throttle for reducing the amount of cold water flowing from the water supply pipe to the heating unit when the temperature of the hot water obtained by heating the cold water flowing from the water supply pipe in the heating unit does not reach a predetermined temperature. In the hot water supply temperature adjusting device for a hot water supply device provided with a valve, the throttle valve is formed so as to be movable in the axial direction so as to change the passing area of the cold water by linear movement,
Pipe so that the pressure of cold water before passing through the heating section and the pressure of hot water after passing through the heating section are separately applied to the front side and the back side of the throttle valve, and the throttle valve is controlled by a solenoid. A hot water supply temperature adjusting device for a hot water supply device, characterized in that it is driven forward and backward in the axial direction. 2. A variable mixing valve for mixing hot water obtained by heating in the heating section with cold water at an appropriate ratio is provided, and the variable mixing valve is driven back and forth by a second solenoid. The hot water supply temperature adjusting device of the hot water supply device according to claim 1.