JPH0667735A - Hot-water supply temperature adjusting device for hot-water supply device - Google Patents

Abstract

PURPOSE:To obtain a driving part of a throttle valve at a low cost, and also, to increase a reaction speed by offsetting hydraulic pressure applied to the front side of the throttle value by hydraulic pressure applied from the back side, and driving the throttle value to move forward and backward by a solenoid. CONSTITUTION:A variable mixing valve 20 mixes hot water obtained by heating cold water flowing in from a feed water tube 1, with cold water in a suitable ratio and pours hot water. When its hot water pouring temperature does not reach a prescribed temperature, a throttle valve 10 reduced the quantity of cold water flowing into a heating part 7 from the feed water tube 1. The throttle valve 10 consists of a cylinder shape, and moves forward and backward freely in the axial direction in a cylinder 11. Hydraulic pressure in the feed water tube applied to the front side of the throttle valve 10 is applied to the back side, as well of the throttle valve 10 by a communicating hole 16. A solenoid 14 drives the throttle 10 so as to move forward and backward in the axial direction. Hydraulic pressure applied to the front side of the throttle valve 10 can be offset by hydraulic pressure in the feed water tube 1 of the back side. In such a way, the throttle valve 10 can be driven by using the solenoid 14 by light force, and a high reaction speed can be obtained by the device of a low cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present 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 and 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-mentioned object, the hot water supply temperature adjusting device of the hot water supply device of the present invention is configured such that hot water obtained by heating cold water flowing from a water supply pipe in a heating section is appropriately used as cold water. Hot water supply provided with a variable mixing valve for mixing and discharging hot water at a ratio of 5 and a throttle valve for throttling the amount of cold water flowing into the heating part from the water supply pipe when the hot water temperature does not reach a predetermined temperature. In the hot water supply temperature adjusting device of the device, the throttle valve is formed in a piston shape that can advance and retract in the axial direction in the cylinder, and the water pressure in the water supply pipe applied to the front side of the throttle valve is also applied to the back side of the throttle valve. A communication hole for adding is provided, and the throttle valve is driven to move back and forth in the axial direction by a solenoid.

The variable mixing valve may be driven back and forth by a second solenoid provided in parallel with the solenoid.

[0009]

The water pressure in the water supply pipe is applied not only to the front side but also to the back side of the throttle valve, so that the water pressure from both sides is offset, and the throttle valve is driven forward and backward by the solenoid with a light force.

Even if the water pressure in the water supply pipe changes, the throttle valve is always in the same state in which the water pressures on both sides are offset. Therefore, the amount of water supplied to the heating unit is controlled according to the magnitude of the electric current applied to the solenoid.

[0011]

Embodiments will be described with reference to the drawings. Figure 1
1 shows an 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 part 2 has a hot water pipe 8 passing through a heating part 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 is a flow rate sensor provided in the middle of the hot water conduit 8 for detecting the flow rate of the hot water.

The throttle valve 10 is formed in the cylinder 11 in the form of a piston that can advance and retreat in the axial direction, is arranged so as to face the inflow port 3 of the cold water, and is provided on the inflow port 3 side (front side). Against the biasing force of the compression coil spring 12, it is pushed by the first solenoid 14 from the back side via the rod 13.

The diameter of the valve seat 15 facing the conical valve portion formed on the front surface side of the throttle valve 10 and the diameter of the rear surface portion of the throttle valve 10 (that is, the diameter of the cylinder 11) are formed to have the same size. ing. Then, the same water pressure as that in the water supply pipe 1 on the front side is applied to the rear surface side of the throttle valve 10 through the communication hole 16 which is formed by penetrating the throttle valve 10 in the axial direction.

Therefore, the throttle valve 10 receives a force of the same magnitude due to the same water pressure on the front surface side and the back surface side.
The water pressure from both sides is offset, and the operation of the throttle valve 10 is not affected by the water pressure in the water supply pipe 1.

As a result, the throttle valve 10 operates so as to stand still at a position where the urging force of the compression coil spring 12 and the driving force of the first solenoid 14 that opposes it are stopped, and the electromagnetic coil 14a of the first solenoid 14 is operated. The valve opening is controlled according to the value of the energization current to the valve. 14b is an electromagnetic coil 14
It is a drive circuit (driver) of a.

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 of the cold water pipe 24 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.

A second solenoid 31 is provided side by side with the first solenoid 14, and the variable mixing valve 20 resists the urging force of the compression coil spring 29 and is actuated by the second solenoid 31 via the rod 30. It has been pressed.

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 tap water temperature setting unit 36 for setting the tap water temperature from the tap 27, a cold water inlet 22, a hot water inlet 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 of the above embodiment having the above-mentioned structure, the value of the electric 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 temperature 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 energization current to the first solenoid 14 to be
The opening degree of the throttle valve 10 is controlled to be narrowed, 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.

[0025]

According to the hot water supply temperature adjusting device of the hot water supply device of the present invention, the water pressure applied to the front side of the throttle valve is canceled by the water pressure applied from the back side, so that the water pressure applied to the valve is not affected. The solenoid can be used to drive the throttle valve with a light force and a fast reaction rate can be obtained with a low cost device.

Further, the variable water mixing valve is also driven by the 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]

 DESCRIPTION OF SYMBOLS 1 Water supply pipe 7 Heating part 10 Throttle valve 11 Cylinder 14 1st solenoid 16 Communication hole 20 Variable mixing valve 31 2nd solenoid

Claims (2)

[Claims] Claim: What is claimed is: 1. 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, and the hot water temperature does not reach a predetermined temperature. In a hot water supply temperature adjusting device of a hot water supply device, which is provided with a throttle valve for throttling the amount of cold water flowing from the water supply pipe to the heating part at times, the throttle valve is formed into a piston shape that can advance and retreat in the axial direction in the cylinder. Along with the formation of the throttle valve, a communication hole for applying water pressure in the water supply pipe applied to the front side of the throttle valve to the rear side of the throttle valve is also provided, and the throttle valve is driven forward and backward in the axial direction by a solenoid. A hot water supply temperature adjusting device for a hot water supply device. 2. The hot water supply temperature adjusting device for a hot water supply device according to claim 1, wherein the variable mixing valve is driven forward and backward by a second solenoid provided in parallel with the solenoid.