JPH0247401Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field The present invention relates to a hot water supply device for a reheating bath kettle.
More specifically, the present invention relates to a hot water supply device for a bathtub that prevents dirty water or hot water in the bathtub from flowing into the drive section of the three-way valve, thereby preventing malfunction of the bathtub.

(b) Prior art Three-way solenoid valves have traditionally been used in water heaters for reheating bathtubs. The conventional structure of a water heater using such a conventional three-way solenoid valve is as shown in FIG. and connect its port d to the bathtub j via the heat exchanger e, connect the normally closed port g formed in the main body f of the solenoid valve to the tank h, and further connect the common port formed in the main body f. i was connected to the bathtub.

However, in such a conventional water heater, the dirty water in the bathtub flows into the guide tube K, in which the plunger h of the solenoid d is movably provided, through the normally open port d. Dirt accumulates in the gap between the tube and the plunger, causing the plunger to lock and cause the solenoid valve to malfunction.For the same reason as above, the plunger cannot be completely attracted, causing the plunger to vibrate and generate noise. There are also problems such as foreign matter getting stuck between the valve seat and the valve body when the solenoid coil is energized and the normally open port is closed, causing leakage.

(c) Problems to be solved by the invention The problem to be solved by the invention is to improve the structure of the three-way solenoid valve so that water from a dirty bathtub does not enter the drive part of the solenoid valve. The objective is to eliminate the occurrence of malfunctions in solenoid valves.

(d) Means for solving the problem In order to solve the above problem, the present invention provides a pair of bathtub conduits connected to the bathtub, a supply conduit connected to the tank, and a pair of bathtub conduits connected to the bathtub conduit and the supply conduit. In a hot water supply device for a reheat bath kettle equipped with a three-way valve, the three-way valve is formed with a valve chamber, and first, second, and third ports communicating with the valve chamber from different directions. A main body in which first and second valve seats are provided around open ends of first and second ports in a valve chamber, a valve body movably provided in the valve chamber, and connected to the valve body. a solenoid configured to actuate the valve body, the first valve seat and the second valve seat facing each other, and the valve body being formed at the open end of the first port; locating the solenoid on the side of the first port such that a plunger of the solenoid can push the tank through a valve stem extending through the first port; connected and configured.

(E) Operation In the above configuration, when the coil of the solenoid is not energized, the valve body is pressed against the first valve seat and the first port is closed. Therefore, although the water or hot water in the bathtub flows between the second port and the third port, the water or hot water in the bathtub is prevented from flowing into the solenoid drive section. When the coil is energized, the plunger is attracted to the fixed core and the valve body engages the second valve seat, which in turn closes the second port and opens the first port. Therefore, water or hot water in the tank now flows from the first port to the third port. Since the water or hot water in the tank is clean, it will not cause malfunction even if it flows into the solenoid drive section.

(f) Example The present example will be described below with reference to the drawings.

FIG. 1 shows a reheating bath kettle water heater 1 of this embodiment, and FIG. 2 shows a three-way solenoid valve (hereinafter simply referred to as a three-way valve) 10 used in the bath kettle water heater.

In Figure 1, 2 is a bathtub, 3 is a tank, and 4a
4b is a bathtub conduit, 5 is a pump, 6 is a supply conduit, 7 is a heat exchanger, 8 is a two-way solenoid valve for hot water supply, 9 is a heat exchanger for hot water supply, and 10 is a three-way valve.

In FIG. 2, reference numeral 20 denotes an axial hole 21 that defines the valve chamber 22, and three ports communicating with the axial hole 21: a first port, that is, a normally closed port (hereinafter referred to as an NC port) 23, and a second port. In other words, normally open port (hereinafter NO
24 (hereinafter referred to as a port) and a third port (hereinafter referred to as a COM port) 25 are formed; 30 is a valve body movably provided in the valve chamber 21; 40 is one end of the valve body 20. This is a solenoid provided at the upper end (in the example).

As shown, the NC port 23 of the main body communicates with the upper side of the axial hole 21, the NO port 24 communicates with the bottom of the lower end of the axial hole 21, and the COM port 2
5 communicates with the side of the lower end of the axial hole 21. Inside the axial hole 21 is a valve chamber 2 for the NO port 24 at the bottom.
Valve seat member 5 forming a valve seat 51 surrounding the second side opening end
0 is set. The valve seat member 50 is made of a softer material than the valve body 30. Axial hole 21
Further inside, there is an insert 6 which defines the valve chamber 22 within the axial hole, forms a valve seat 61 at a position facing the valve seat 51, and forms a spring receiver 62.
0 is inserted. The insert 60 is made of metal or hard synthetic resin, and is inserted into the valve seat member 5.
It is fixed at 0.

A valve rod 31 is integrally formed in the valve body 30 and extends along the axial direction within the axial hole 21 and passes through the spring receiver 62 . A spring receiver 32 is attached to the upper end of the valve rod 31, and a spring 70 is provided between the spring receiver 32 and the spring receiver 62 to press the valve body 30 upward.

The solenoid 40 includes a guide tube 41 and a fixed iron core 42 fitted to the lower end of the guide tube 41.
, a movable core or plunger 43 movably provided within the guide tube 41 , a coil 44 provided around the guide tube 41 , a yoke 45 around the coil 44 , and a plunger 43 extending through the fixed core 42 . The push rod 46 has an upper end fixed to the plunger 43.
6 to press the upper end of the valve stem 31.

The above three-way valve 10 connects the NC port 23 to the supply conduit 6
The NO port 24 is connected to the bathtub conduit 4a, and the COM port 25 is connected to the bathtub conduit 4b.

In the above three-way valve, when the coil 44 is not energized, the valve body 30 and the plunger 43 are pushed up by the action of the spring 70, and stop with the seal member 33 on the top surface of the valve body 30 in contact with the valve seat 61. ing. Therefore, the NC port 23 is closed, and the NO port 24 and COM port 25 are in communication. Next, when the coil 44 is energized, the plunger 43 is attracted to the fixed iron core 42, so the valve body 30 is pushed down via the push rod 46 and the valve stem 31, and the lower surface of the valve body 30 engages with the valve seat 51. Therefore, the NO port 24 is now closed, and the NC port 23 and COM port 25 communicate with each other. At this time, the valve seat member 50 is pushed by the valve body and can be bent, so that the plunger 43 comes into contact with the fixed iron core 32 at the same time as the valve body contacts the valve seat 51. Therefore, vibration of the plunger is eliminated and noise is also reduced.

The operation of the water heater for bathtubs will be explained below.

When the water level in the bathtub is below the set value, the three-way valve 10
The coil 44 of the solenoid 40 is energized, and after a slight delay, the motor of the pump 5 connected to the bathtub conduit 4a is energized. Then, the plunger 4 of the valve body 30
3, the valve body engages with the valve seat 51.
Open NC port 23 and close NO port 24,
Pump 5 starts operating after a while. Therefore, the tank 3 is overheated by the hot water supply heat exchanger 9.
The hot water stored therein flows through the supply conduit 6 to the COM port 25, from where it is sent by a pump into the bathtub 2 through the bathtub conduit 4a and is stirred. When the water level in the bathtub reaches a predetermined value, the current supply to the coil 44 is stopped, and the valve body 30 is raised to close the NC port 23. The operation of the pump is also stopped.

When the water temperature in the bathtub drops, the three-way valve 10
Heating can be performed by the reheating heat exchanger 7 with the NC port closed. At this time, the pump 5 operates to send heated hot water into the bathtub and stir it.

(g) Effects The present invention can produce the following effects.

Dirty hot water in the bathtub does not enter the drive part of the solenoid valve, and rust or malfunction can be prevented.

It is possible to prevent foreign matter from adhering to the spring, and it is possible to prevent malfunction of the valve body.

[Brief explanation of the drawing]

Fig. 1 is a schematic circuit diagram of a reheating bath kettle water heater according to the present invention, and Fig. 2 is a sectional view of an embodiment of the three-way solenoid valve used in the bath kettle water heater shown in Fig. 1. , FIG. 3 is a schematic circuit diagram of a conventional hot water supply device for a bathtub. 1... Water heater for bathtub, 2... Bathtub, 3...
Tank, 4a, 4b... Bathtub conduit, 5... Pump, 6... Supply conduit, 10... Three-way solenoid valve, 20
...Body, 22, 23, 24...Port, 30...
... Valve body, 40 ... Solenoid, 42 ... Fixed iron core, 43 ... Plunger, 50 ... Valve seat member, 5
1... Valve seat, 60... Insert, 61... Valve seat.

Claims (1)

[Scope of utility model registration request] In a hot water supply device for a reheat bath kettle, the three-way valve includes a pair of bathtub conduits connected to a bathtub, a supply conduit connected to a tank, and a three-way valve connected to the bathtub conduit and the supply conduit. A valve chamber is formed with a first port, a second port, and a third port that communicate with the valve chamber from different directions. a main body provided with a valve seat, a valve body movably provided within the valve chamber, and a solenoid connected to the valve body to operate the valve body, the first and second valves The seats are arranged to face each other to press the valve body toward the first valve seat formed at the open end of the first port, and the solenoid is arranged on the first port side to press the valve body toward the first valve seat formed at the open end of the first port. A hot water supply device for a reheating bathtub, characterized in that the plunger of a solenoid can be pressed via a valve stem extending through the first port, and the tank is connected to the first port.