JPS5849766B2 - Mixing valve and water heater using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is designed to automatically mix hot water from an endothermic pipe inserted into a heating can of a bathtub and cold water from a water supply pipe to flow out hot water at a predetermined temperature. The present invention relates to a mixing valve and a water heater using the same.

Some bathtubs are equipped with a hot water supply device for supplying hot water to a shower head or hot water pipe.

The temperature of the hot water spouted from this shower head or the like is around 43 degrees, which is comfortable for the human body.

What is important in this case is that when using the shower, it is desirable that the temperature of the hot water flowing out from the shower head remain constant from the beginning to the end of use.

In particular, if hot water flows out of the shower head at the beginning of a shower, there is a risk of burns, so it is necessary to avoid this.

On the other hand, various mixing valves have been devised that are used to supply hot water at around 43° to a shower head, and which automatically mix the mixing ratio of hot water and cold water according to the water temperature. However, it is difficult to stabilize the hot water temperature, and the above-mentioned requirements cannot always be met.

An object of the present invention is to provide a mixing valve that can stably form hot water at a fixed amount and at a constant temperature, and a water heater that can satisfy the above-mentioned requirements.

Embodiments of the present invention will be described below with reference to the drawings.

In Figures 1 and 2, 1 is the case of the bathtub, 2 is the main gas burner, 3 is the pilot gas burner, 4 is the heating can (for circulation) as the main body disposed on the main gas burner 2, and 5 is the heating can (for circulation). A lower circulation pipe 6 is integrally provided at the lower part of the heating can 4, an upper circulation pipe 6 is integrally provided at the upper part of the heating can 4, and a heat retention case 7 covers these.

The circulation pipes 5 and 6 are connected to the bathtub 8, as shown in FIG. 3, so that the heating can 4 and the bathtub 8 are communicated with each other.

A thermo valve 9 that opens and closes by sensing the temperature of hot water in the upper circulation pipe 6 is installed in the opening of the upper circulation pipe 6 to the bathtub 8, that is, in the hot water outlet (see FIG. 3).

This thermovalve 9 includes a cylindrical valve body 10 screwed into the upper circulation pipe 6, a wax container 11 that projects into the upper circulation pipe 6 and is fixed to the valve body 10, and one end inside the wax container 11. a valve body 13 that engages with the valve rod 12 into which the valve rod 12 is inserted; a molded plate 14 attached to the opening of the valve body 10; and a compression coil interposed between the molded plate 14 and the valve body 13. It has a spring 15.

In the figure, 16 is a valve hole formed in the valve body 10, and 11 is an opening formed between the valve body 10 and the shaped plate 14.

A wax container 11 of the thermovalve 9 is filled with heat-sensitive wax.

When the container 11 is heated, this wax thermally expands and causes the valve rod 12 to advance toward the valve body 13.

(7) The valve 0'7}'12 and the valve body 13 are connected to the valve rod 1 when the wax container 11 is heated to a temperature of 80°C or higher.
2 presses and displaces the valve body 13 toward the molding plate 14 against the compression coil spring 15 to open the valve hole 16 into the opening 1.
7 so as to be able to communicate with each other.

In FIGS. 2, 4, and 5, reference numeral 18 indicates a mixing valve for mixing cold water and hot water, which is disposed near the heating can 4. As shown in FIG.

This mixing valve 18, as shown in FIG.
It has a body that is hollow inside.

This main body includes a cylinder 19, a plug-shaped lid 20 screwed onto one end of the cylinder 19, a cylinder 21 screwed onto the other end of the cylinder 19, and a lid 20 screwed onto the cylinder 21. It has a lid body 22 that is fitted together.

A valve hole 19C consisting of a dog-diameter hole 19a and a small-diameter hole 19b is formed in the cylinder 19.
A step portion 19d is formed between the small diameter hole portion 19b and the small diameter hole portion 19b.

A cylindrical portion 23 for connection is integrally provided in the center of the lid body 22, and a cold water intake port 24 is provided within this cylindrical portion 23.

In addition, pipes 25 are provided at intervals in the longitudinal direction of the cylindrical body 19.
．． 26 is fixed.

A hot water intake port 27 that opens to the valve hole 19C in the cylindrical body 19 is formed in the pipe 25, and a mixed water outlet 28 that opens to the dog diameter hole 19a is formed in the pipe 26.

In this way, the cold water inlet 24, the hot water inlet 27, and the mixed water outlet 2B are provided in this order in the longitudinal direction of the main body of the mixing valve 18.

The opening of the hot water intake port 21 to the valve hole 19 is rectangular as shown in FIG.

This is to proportionally control the flow rate.

In the figure, 29.30 is a threaded cylinder for connection rotatably held by the pipe 25.26.

Inside the valve hole 19a is a first valve 31. second valve 32, third
A valve 33 is equipped.

The first valve 31 includes a flange-shaped valve seat 34 located between the cold water intake port 23 and the hot water intake port 26 and protruding into the cylinder body 21, and a flange-shaped valve seat 34 located on the side of the cold water intake port 24 from the valve seat 34. body 2
1, and a compression coil spring 36 interposed between the lid body 22 and the valve body 35.

This valve body 35 is formed with a small passage 37 that opens on both sides at the peripheral edge, and a fitting protrusion 38 that fits into the inner circumferential surface 34a of the valve seat 34.

In the figure, A is a cold water chamber formed between the valve body 35, the lid body 22, and the cylinder body 21.

The second valve 32 includes a ring-shaped valve seat body 39 that is located between the hot water intake port 27 and the mixed water outlet port 28 and is screwed into the cylinder body 19 so as to be able to move forward and backward freely. inner peripheral surface 3
It has a valve body 40 that fits into the valve body 9a.

A mixing chamber 41 is provided between the second valve 32 and the first valve 31.
is formed.

The third valve 33 includes a cylindrical valve body 42 that is slidably fitted into the dog diameter hole 19a of the cylindrical body 19 within the mixing chamber 41;
Disk portion 4 integrally provided at one end of this valve body 42
3, and a shaft portion 4 provided integrally with this disk portion 43.
It has 4.

This disk portion 43 converts the mixing chamber 41 into a first mixing chamber 41a.
and a second mixing chamber 41b, both mixing chambers 4
1a and 4lb communicate with each other via a plurality of small passages 45 formed in the disk portion 43.

This small passage 45 is provided at a position close to the shaft portion 44 side.

A hole 46 that opens into the second mixing chamber 4lb is formed in the shaft portion 44, and a large diameter portion 46a is formed at the end of this hole 46.

B in the figure is a mixing ice chamber formed between the third valve 33, the lid body 20, and the cylinder body 19.

47 is a thermal expansion and contraction device for the mixing valve 18.

This thermal expansion/contraction device 47 includes a wax container 48 as a heat sensing portion, one end 48a of which is fitted into the large diameter portion 46a of the hole 46, and the other end 48b of which is screwed onto the valve body 40 of the second valve 32.
, a telescopic rod 49 whose one end is inserted into the other end 48b of the wax container 48 and whose other end penetrates the valve body 40 and projects into the mixing ice chamber; Contains temperature-sensitive wax (thermo wax).

The telescopic rod 19 is adapted to advance into the mixing ice chamber B or sink into the wax container 48 side as the temperature-sensitive wax expands and contracts.

In the figure, 50 is a heat insulating space formed between the hole 46 and the wax container 48.

51 is a shaft for adjusting the temperature of the mixing valve 18.

This temperature adjustment shaft 51 is screwed into the lid 20 so as to be adjustable in advance and retreat with respect to the valve body 40.

This temperature adjustment shaft 51 has the telescopic rod 1 described above.
9 and the valve body 40 are engaged.

In the figure, 52 is a stopper pin protruding from a portion of the shaft 51 inside the mixing ice chamber B, and 53 is an adjustment space at the bottom of the hole in which the female thread of the lid 20 is formed.

By adjusting the forward and backward movement of the shaft 51,
Even if the temperature of cold water differs greatly between summer and winter, by changing the mixing ratio of hot water and cold water, the temperature of the mixed water can be adjusted to 4 regardless of the season.
It can be brought to 3°C.

The width X of the circumferential surface of the fitting protrusion 38 of the valve body 35 described above and the width Y of the circumferential surface of the valve body 40 are formed to be the same.

Moreover, the first valve 31. Second valve 32 and hot water intake 2
The opening length a of No. 7 to the valve hole 19C is set so that the thermal expansion and contraction device 41 operates as shown in the following table.

Note that the values in this table are just examples, and are not necessarily limited to the numerical values in this table.

In FIG. 1, 54 is an endothermic pipe inserted into the hot water chamber 4a in the heating can 4.

This heat absorption pipe 54 meanders in the vertical direction.

One end (lower end) of this heat absorption pipe 54 is connected to a water supply pipe 55.
It is connected to the.

This water supply pipe 55 is connected to a water supply source (not shown) via a flow rate adjustment valve 56.

The other end (upper end) of the heat absorption pipe 54 is connected to the hot water intake port 27 of the mixing valve 18 via a very short pipe 51 near the heating can 4 .

A water supply pipe 55 is connected to the cold water intake port 24 of the mixing valve 18 via a pipe 58, and a hot water supply pipe 59 and an upstream hot water pipe 61. A shower head 62 is connected.

Next, the operation of the mixing valve and water heater having such a configuration will be explained.

When the heating can 4 is heated by the main svarna 2, the water temperature in the heating can 4 rises.

When the temperature of the water in the upper part of the heating can 4 reaches approximately 80°C, the thermovalve 9 in the upper circulation pipe 6 opens, and the hot water in the heating can 4 flows into the bathtub 8 by convection. The cold water inside flows into the heating can 4 from the lower circulation pipe 5 and is heated.

Along with the heating of the heating can 4, the heat absorption pipe 54
The water inside absorbs thermal energy from the hot water inside the heating can 4.

As a result, the water temperature inside the heat absorption pipe 54 is kept the same as the water temperature inside the heating can 4.

Since this endothermic pipe 54 and the hot water intake port 27 of the mixing valve 18 are connected via a short pipe 57 near the heating can 4, the inside of the mixing chamber 21 of the mixing valve 18 is also at almost the same temperature as the inside of the endothermic pipe 54. It will be preserved.

Therefore, the wax container 48 of the mixing valve 18
is heated to the same temperature as the water in the heat absorption pipe 54, so the telescopic rod 4 of the mixing valve 18
9 advances to the mixing ice chamber B side due to the expansion of the thermowax in the wax container 48, and the first valve 31 and the second valve 32 are opened.
As the valve opens, the opening area of the hot water intake port 27 to the valve hole 19c becomes smaller.

From this state, when the flow rate adjustment valve 56 is opened and the switching cock 60 is switched to either the shower head 62 or the upstream hot water pipe 61, cold water flows from the water supply pipe 55 to the heat absorption pipe 54, while cold water from the mixing valve 18 flows. Cold water flows into chamber A.

The cold water that has flowed into the heat absorption pipe 54 is transferred to the heat absorption pipe 5
4 is heated by the surrounding hot water to become hot water, which flows into the first mixing chamber 41a from the hot water intake port 27 of the mixing valve 18.

Furthermore, the cold water that has flowed into the cold water chamber A flows into the first mixing chamber 41a through the small passage 37 and the passage between the fitting protrusion 38 and the valve seat 34, and then flows into the first mixing chamber 41a from the hot water intake port 21. Mixed with boiling water.

After that, this mixed water (hot water) flows into the second mixing chamber 4Ib through the small passage 45, and then from the opening part of the third valve 33 to the mixing water chamber A and the mixed water outlet 28. , hot water pipe 59,
The hot water is supplied to an upstream pipe 61 or a shower head 62 via a switching cock 60.

At this time, after the hot water and cold water are mixed in the first mixing chamber 41a, they are further mixed by the turbulent flow when passing through the small passage 45 and after passing through, so that there is a good amount of water in the second mixing chamber 41b. A mixed hot water is formed.

In this case, the wax container 11 of the heat expansion and contraction device 41 is heated by hot water.
is heated.

Therefore, when the temperature of the water in the second mixing chamber 41b slightly decreases, the telescopic rod 49 contracts and the first valve 31. The second valve 32 operates integrally in the valve opening direction, and the valve element 42 is integrally displaced in the same direction as the valve elements 35 and 40, so that the hot water intake port 2
When the opening area to the valve hole 19c of the valve hole 19c of the valve 31. As the second valve 32 operates in the valve opening direction, the valve body 42 is integrally displaced in the same direction as the valve bodies 35 and 40, and the opening area of the hot water intake port 21 to the valve hole 19c becomes smaller.

This action actually takes place as shown in the table above.

In this way, the ratio of hot water and cold water flowing into the first mixing chamber 41a is automatically adjusted, and hot water at 43° C. is caused to flow out from the shower head 62 or the hot water pipe 61.

Such an action is performed in the same way even if the capacity of the main gas burner 2 is switched.

In the embodiment described above, the heat absorption pipe 54 is installed inside the heating can 4.
Although we have shown an example in which a mixing valve 18 is attached to a bathtub of the type in which a water heater is provided, the water heater is not limited to this, and as shown in FIGS. 8 and 9, A case body 63 attached to the outlet of the upper circulation pipe 6 of the bathtub 8, a heating chamber 64 formed between the case body 63 and the inner wall of the bathtub 8, and a heating chamber 64 disposed within the heating chamber 64. The water heating device may be constructed by attaching the mixing valve 18 to a heat exchange device having an endothermic pipe 54' and a thermovalve 65 attached to the case body 63.

Note that this thermovalve 65 opens at a predetermined temperature (approximately 80° C.) to allow hot water to flow into the bathtub 8.

Since the mixing valve of the present invention is configured as described above, it is possible to reliably mix hot water and cold water and automatically supply hot water at a constant temperature.

In addition, a second valve interlocked with another valve is installed between the mixing chamber and the mixing ice chamber.
Since this valve is installed, a stable amount of hot water can be obtained at all times even if there are pressure changes upstream of the mixing ice chamber.

Furthermore, since the opening of the hot water intake port is rectangular in shape, the amount of hot water flowing into the mixing chamber can be increased or decreased in proportion to the opening degrees of the other valves.

As a result, it is possible to constantly and stably obtain hot water at a constant constant temperature.

Furthermore, as explained above, the water heater of the present invention mixes the hot water in the heat absorption pipe inserted into the heating can and the cold water from the water supply pipe using the cold water and hot water mixing valve disposed near the heating can. Since the configuration is such that hot water at a predetermined temperature flows out from this mixing valve, even if hot water and water are not mixed in the mixing valve, the water temperature in the heat absorption pipe can be detected by the heat sensing part of the mixing valve. Can be transferred to wax container.

Moreover, the water temperature transmitted to the heat sensing section at this time does not drop because the connection between the heat absorption pipe and the mixing valve is short.

Therefore, since the mixing valve is always operating to achieve optimal mixing according to the water temperature in the heat absorption pipe, there is no delay in the operation of the mixing valve due to hot water supply.

As a result, hot water does not flow out from the shower, tube, etc. during hot water supply from beginning to end, and hot water at a predetermined temperature can flow out from the shower head, etc., so there is no risk of burns or the like.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway diagram of a water heater showing an embodiment of the present invention. FIG. 2 is a sectional view showing the heating can shown in FIG. 1 as viewed from the left side. FIG. 3 is a sectional view showing how the heating can and bathtub shown in FIG. 1 are attached. FIG. 4 is a partial perspective view of FIG. 2. FIG. 5 is a piping system diagram of the water heater shown in FIGS. 1 to 3. FIG. 6 is a sectional view of the mixing valve shown in FIGS. 2, 4, and 5. FIG. 7 is a front view showing the shape of the hot water intake port of the mixing valve shown in FIG. 6. FIG. 8 is a perspective view of a water heater showing another embodiment of the present invention. FIG. 9 is a sectional view taken along the line N-W in FIG. 8. 4a...
Hot water chamber, 5...Lower circulation pipe, 6...
・Upper circulation pipe, 8...Bathtub, 9...
・Thermo valve, 18...Mixing valve, 24
......Cold water intake, 27...Hot water intake, 28...Mixed water outlet, 31...First valve, 32... ...Second valve, 33...
Third valve, 41...Mixing chamber, 45...
Small passageway, 47... Heat expansion and contraction device, 48...
・Wax container (heat sensing part), 49... Telescopic rod, 54, 54'... Endothermic pipe, 55...
...Water supply pipe, 59...Hot water supply pipe, 6
4... Heating chamber, 65... Thermo valve.

Claims (1)

[Scope of Claims] 1. A cold water inlet opening into an internal valve hole, a hot water inlet having a rectangular opening shape, and a mixed water outlet are formed at intervals in order in the valve body, and the cold water is inserted into the valve hole. The first valve is disposed between the hot water inlet and the hot water inlet, and the second valve is disposed between the hot water inlet and the mixed water outlet. A mixing chamber is formed between the valves, and the mixing chamber is divided into a first and a second mixing chamber, and an opening to the valve hole of the hot water intake is integrally linked with the first valve. A third valve that opens and closes is provided, a plurality of small passages are formed in the third valve to communicate the first and second mixing chambers, and the second
, the third valve is integrally connected by the heat sensing portion of the thermal expansion and contraction device, and the expansion and contraction of the expansion and contraction rod of the thermal expansion and contraction device causes each of the valves to be operably engaged with the valve body. Characteristic mixing valve. 2. A cold water intake opening into an internal valve hole, a hot water intake opening and a mixed water outlet each having a rectangular opening shape are formed in order at intervals in the valve body, and a cold water intake opening and a hot water intake opening are formed in the valve hole. by arranging the first valve between the hot water inlet and the mixed water outlet, and by arranging the second valve between the hot water inlet and the mixed water outlet, a mixing chamber is formed between the two valves. a third mixing chamber, which divides the mixing chamber into a first and second mixing chamber, and opens and closes an opening to the valve hole of the hot water intake in conjunction with the first valve; a valve is disposed, a plurality of small passages are formed in the third valve to communicate the first and second mixing chambers, and the second
, a third valve is integrally connected by a heat sensing portion of a thermal expansion/contraction device, and the expansion/contraction rond of the thermal expansion/contraction device is engaged with the valve body so that each valve can be actuated by the expansion/contraction of the expansion/contraction device. A thermo valve that opens at a predetermined temperature is installed at the hot water outlet of the hot water chamber heated directly or indirectly by a gas burner to the bathtub, and an endothermic pipe is provided in the hot water chamber, and the mixing valve is arranged close to the main body forming the hot water chamber, a water supply source is connected to the cold water intake of the mixing valve and one end of the heat absorption pipe, and the hot water intake is connected to the other end of the heat absorption pipe. , A hot water supply device characterized in that the mixed water outlet is connected to a hot water supply pipe.