JPS5852430Y2 - Bath pot with heat exchanger for hot water supply - Google Patents

Description

[Detailed explanation of the invention] This invention is capable of heating a bath, and simultaneously heating a bath and supplying hot water for showers, etc. Inside the pot body, which is equipped with a pair of upper and lower circulation pipes to form a natural circulation path and a heat exchanger for heating hot water, one end is connected to a water supply pipe.
The present invention also relates to a bathtub with a heat exchanger for hot water supply, in which a heat exchange coil for heating hot water supply, the other end of which is connected to a hot water supply pipe, is inserted and installed.

Looking at the actual use of showers, which are an example of the use of baths and hot water supply, we can see that showers are generally used to boil a bath and to use a shower while there is hot water in the bathtub, such as using a shower to wash water when taking a bath. However, it is not uncommon for people to use the shower alone without water in the bathtub, such as during the summer.

Therefore, as a bathtub with a heat exchanger for supplying hot water for showers, etc., it is possible to boil a bath and supply hot water for showers, etc. without unnecessary heating of hot water while there is hot water in the bathtub.
It is required to be able to supply hot water for showers, etc. even when there is no water in the bathtub.

Well-known bathtubs with heat exchangers for hot water supply that can meet these demands include a burner compatible with a heat exchanger for hot water supply, a heat exchanger for heating a hot water bath, and a burner compatible with this heat exchanger. However, this is simply a combination of a water heater and a bath boiler, and it is difficult to make the whole pot more compact. However, there are significant restrictions on hot water piping, fuel gas piping, etc., and it is also necessary to install separate burners and combustion control devices and safety devices for each burner.
In practice, it is extremely difficult to make the entire structure compact, and the structure tends to be complicated and expensive.

In addition, it does not have the above-mentioned structural defects, and as mentioned above, it is possible to boil a bath, and to supply hot water for showers etc. without unnecessary heating of hot water in the bathtub. As shown in Fig. 3, this bath pot has multiple functions such as being able to supply hot water for showers, etc. without water, and has a box body 012 with an open top called a heat exchange box inside the pot body OA.
By providing this, a chamber OA' is formed in the pot body OA in which water can remain up to a level corresponding to the height of the upper edge of the side wall of the box body 012 even when the water in the bathtub OB is drained. It has been proposed that a heat exchange coil OC for heating hot water is inserted and installed in the water residual chamber OA' in an immersed state.

According to this, when the water is drained from the bathtub OB, the residual water in the chamber OA' is heated via the heat exchanger 02, and the high-temperature heated water is mixed with the low-temperature water flowing in the coil OC. Liquid-liquid indirect heat exchange has made it possible to use hot water independently for showers, etc., but this system still has problems in the following points.

■ The first problem is the natural circulation of hot water between the bathtub and the pot when the bathtub is filled with the necessary amount of water, and the depth of the hot water in the bathtub when it boils. This is a trade-off issue in relation to the distribution in the horizontal direction.

In other words, in order to improve the distribution of boiling water temperature in the bathtub, the upper circulation pipe 04 connecting the pot body OA and the bathtub OB must be
However, the height of the side wall of the heat exchange box 012 is necessarily determined to heat the hot water for the shower, and therefore the upper circulation pipe 012 should be installed as low as possible.
4, the lower the natural circulation force due to the inflow of low temperature water into the heat exchange box 012 and the outflow of hot water boiled in the heat exchange box 012 into the bathtub, and Heat exchanger 02 is likely to be heated abnormally, and conversely, if the above-mentioned upper circulation pipe 04 is installed at a high position to improve natural circulation force, high-temperature water will be discharged to a high position in the bathtub. The problem is that there is a noticeable distribution of hot water temperature inside the bathtub.

OThe second problem is that when hot water is supplied while there is hot water in the bathtub, for example, when using a shower when taking a bath, the water residual chamber OA of the pot body for heating the hot water heating heat exchange coil OC is As hot water is heated inside the tank, the hot water will circulate between the pot body OA and the bathtub OB, so the bath will be heated unnecessarily even when hot water is being supplied, making it difficult to take a bath. This makes it difficult to simultaneously maintain a suitable water temperature and supply hot water for showers, etc.

In view of the above-mentioned circumstances, the present invention has a residual water configuration that allows hot water to be supplied independently when the water is drained from the bathtub.
To provide a bathtub with a heat exchanger for hot water supply, which ensures reliable and good natural circulation of hot water during bath boiling, and can suppress dissipation of heat into the bathtub as much as possible during hot water supply.

The characteristic structure of the bath pot with a heat exchanger for hot water supply according to the present invention, which was made to achieve the above object, is that a pair of upper and lower parts are provided between the pot body and the bathtub to form a natural circulation path for hot water. Among the circulation pipes, a low-temperature water inflow path from a low-temperature water flow path in the lower circulation pipe to the above-mentioned pot main body is provided such that its upper end edge protrudes above the bottom end of the heat exchange coil from the bottom surface of the above-mentioned pot main body. It is constructed in an approximately inverted U-shape by a plate-shaped weir that is erected in a vertical position, and plate-shaped members whose longitudinal section is approximately in the shape of an inverted U, which are provided at appropriate intervals on both the front and back surfaces of this plate-shaped weir and on the upper edge. At the same time, a small hole is provided at the top of the inverted U-shaped plate member so as to communicate with the high-temperature water outflow path, so that when the water in the bathtub is drained, the upper edge of the weir in the pot body is The pot is configured to allow water to remain up to a corresponding height position, and the pot is located in the pot body near the entrance of the high temperature water outflow path in the upper circulation pipe and near the outer periphery of the heat exchange coil. A plate-shaped heat-resistant member is suspended downward from the upper surface of the main body with its lower edge protruding below the upper edge of the plate-shaped weir, and a microhole is opened in the upper part of the heat-resistant member. Further, a flow path portion communicating with the high temperature water outflow path is formed between the heat resistant member and the inverted U-shaped plate member,
With such a characteristic configuration, (1) When the water in the bathtub and the pot body is drained by removing the stopper of the bathtub, when the water level lowers and reaches the top of the inverted U-shaped plate member, the lower temperature of the inverted U-shaped plate member occurs. Since the inflow path communicates with the atmosphere through the microholes, the high temperature water outflow path, and the inside of the bathtub, and the siphon action is cut off, the water in the pot body is no longer discharged, and the plate-like weir is It is possible to reliably retain water in the pot body up to a height corresponding to the upper edge, and by heating this residual water, the low-temperature hot water supply is heated via the hot water heating heat exchange coil, and the bathtub is heated. (II) When heating a bath with the required amount of water in the bathtub, the low-temperature water flowing from the bathtub is flowed into the inverted U shape. Since the hot water is supplied to the bottom of the pot body through a channel, if the water temperatures on both sides of the weir are approximately equal, the natural circulation force of hot water between the bathtub and the pot body (the hot water in the bathtub and the pot body In terms of density difference with body warm water x vertical distance between inlet and outlet), it can be used almost as effectively as a bathtub without residual water, that is, a general bathtub.

Therefore, even if the upper circulation pipe that forms the high-temperature water outflow path is installed at a relatively low level relative to the bathtub so that the water temperature distribution inside the bathtub is good during boiling, the natural circulation of hot water is ensured and smooth. (III) In addition, when hot water is supplied in a state where there is hot water at the appropriate temperature for bathing in the bathtub, such as when using a shower when taking a bath, the heated high-temperature water in the pot body is heated in a straight line through the high-temperature water outflow path. Rather than letting the heat-resistant plate flow into the bathtub, the heat-resistant plate flows downward along one surface of the heat-resistant plate, wraps around the lower edge of the heat-resistant plate, and flows upward along the ground of the heat-resistant plate. While bending and flowing in the vertical direction, most of the heat held by the water can be transferred to the low-temperature hot water supply water flowing in the hot water heating heat exchange coil located in the upper and downward flow regions. This brings about various effects such as being able to supply hot water for showers, etc. without unnecessary reheating of the hot water in the bathtub, and as a result, the following effects are achieved when compared with the conventional example described above.

(1) It has a residual water structure that allows hot water to be used independently when the water in the bathtub is drained, but the water temperature distribution at the time of bathing is the same or almost the same as that of a regular bath kettle. You can boil the bath using natural circulation.

(2) When hot water is supplied while the bathtub is filled with water, most of the heat held in the heated high-temperature water within the pot body is transferred to the water for hot water supply, allowing efficient hot water supply for showers and the like.

(3) Due to the above (2), the hot water in the bathtub is less likely to be heated unnecessarily by hot water supply, and a comfortable bathing can be achieved.

Hereinafter, embodiments of the present invention will be described based on the drawings.
is the bathtub body, and in its center is a natural circulation heat exchanger 2 that heats hot water with a burner 1 placed at the bottom.
The exhaust pipe 3 is connected to the combustion chamber 1' of the burner 1, and the exhaust pipe 3 is connected to the combustion chamber 1' of the burner 1 in a vertically penetrating state. A pair of upper and lower circulation pipes 4 that mutually form a natural circulation path for hot water.
5 are connected in series.

A low-temperature water inflow path 5b from the low-temperature water flow path 5a formed by the lower circulation pipe 5 into the pot body A is connected to a plate-shaped weir 8 that stands up from the bottom of the pot body A, and the front and back sides of this plate-shaped weir 8. It has a substantially inverted U-shape structure with plate members 13 having an approximately inverted U-shaped vertical cross section provided at appropriate intervals on both sides and the upper edge, and a bathtub is provided at the top of the inverted U-shaped plate member 13. In order to prevent air pockets from forming at the top of the inverted U-shaped low-temperature water inflow path 5b when filling water into bathtub B, and when draining water from bathtub B, the water in the pot body A is removed by the siphon phenomenon. A micro hole 6 (usually a circular hole of about 5 mm) is formed by the upper circulation pipe 4 to prevent the water from being discharged to a level below the level corresponding to the upper edge of the plate weir 8. High temperature water outflow path 4a
The structure is such that even when the water in the bathtub B is drained, water can remain in the pot body A at a height corresponding to the upper edge of the weir 8. It's intimidating.

C is connected to a water supply pipe 11 having one end equipped with a valve V,
The other end is a hot water heating heat exchange coil connected to a hot water pipe 12 equipped with a shower head 7, etc., and is in a state surrounding the exhaust pipe 3 in the pot body A, and the above-mentioned inverted U-shaped low-temperature coil. It is inserted and installed in a range extending from above to below the height position of the upper edge of the plate-shaped weir 8 that constitutes the inflow path 5b.

In addition, in the pot body A near the inlet of the high-temperature water outflow path 4a in the upper circulation pipe 4 and close to the outer periphery of the heat exchange coil C, the lower end edge of the pot is placed in a direction downward from the hot water inside the pot body. By hanging the plate-shaped heat-resistant member 9 so as to protrude below the upper edge of the weir 8,
The high-temperature water heated inside flows downward along one surface of the heat-resistant member 9, and the high-temperature water that reaches the lower edge of the heat-resistant member 9 flows between the heat-resistant member 9 and the inverted U-shaped plate member 13. The high-temperature water flows upward through the flow path portion 4b formed in the flow path 4b and reaches the inlet of the high-temperature water outflow path 4a.

Reference numeral 10 in the figure is a minute air steam vent hole provided at the upper end of the heat-resistant member 9. When the bathtub B is filled with water, the air is removed to make it easier for water to enter the body A. It controls the function of letting the steam released into the bathtub B, and the function of preventing negative pressure by ventilating the upper part of the inside of the pot body A when the water in the bathtub B is drained.

According to the above embodiment, by filling the bathtub B with water, the pot body A is also filled with water, as shown in FIG. , and is pushed out to the atmosphere through the micropores 6 and the high-temperature water outflow path 4a.
No air pocket is generated at the top of the inverted U-shaped low-temperature water inflow path 5b.

By heating the heat exchanger 2 with the burner 1 in this state, the high-temperature water generated by heating in the heat exchanger 2 flows out to the bathtub B via the flow path 4a in the upper circulation pipe 4, and The low-temperature water in the bathtub B flows into the cauldron body A through the flow path 5a in the lower circulation pipe 5 1, and as a result of this natural circulation, the interior of the bathtub B is heated to a desired water temperature.

In this case, since the low-temperature water inflow path 5b from the low-temperature water flow path 5a into the pot body A has an inverted U shape, the low-temperature water flowing in from the bathtub B is near the bottom of the pot body A, and The low-temperature water is directly supplied to the vicinity of the inlet of the exchanger 2, and mixing of the low-temperature water with the high-temperature water flowing out from the flow path 4a in the upper circulation pipe 4 is prevented.

Note that since the low-temperature water inflow path 5b has an inverted U-shape, natural circulation may be slightly suppressed at the initial stage of ignition of the burner 1; If the temperature of the water becomes the same and the temperature of the water in the pot body A rises, a large circulation force will be generated that is as large as that of a structure without residual water consisting of the weir 8 and the inverted U-shaped plate member 13, which is inconvenient in practice. There isn't.

When the bath is boiling, open the valve (■) and let the water for hot water supply flow through the water supply pipe 11 to the heat exchange coil C. A liquid mixture of high-temperature water heated and generated in the pot body A and low-temperature water for hot water supply will be generated. Hot water is heated by heat exchange, and is supplied to the shower head 7 and the like through the hot water pipe 12.

At this time, the hot water in the pot body A is cooled by this heat exchange and increases in density, and while it naturally circulates inside the pot body A, a portion of it also tries to circulate to the bathtub B side.

In this case, since the heat-resistant member 9 as described above is present near the entrance of the high-temperature water outflow path 5a, a portion of the high-temperature water inside the pot body A only flows out from the air steam vent hole 10 to the bathtub B side. Most of the heat of the high-temperature water is transferred to the low-temperature hot water supply water via the coil C, and only the relatively low-temperature hot water whose temperature has been lowered thereby flows downward.
After flowing upward through b, it flows through high temperature water outflow path 4a to bathtub B.
It will flow out to.

In addition, the high temperature water in the upper part of the pot body A does not have a circulation force between it and the bathtub B due to the presence of the heat-resistant member 9, and the difference in density of hot water between the outflow path 4a and the bathtub B acts as a circulation force, so the heat-resistant member The amount of circulation between the pot body A and the bathtub B is very small compared to the case where the bathtub 9 is not provided.

Heat transfer force to bathtub B (Kcal/h) = C outflow temperature ('C) - return temperature to bathtub ('C)) x specific heat (K
cal/kg'C)X Amount of circulation to the bathtub (kg/h)
However, in this embodiment, as described above, the presence of the heat-resistant member 9 reduces the temperature difference and the circulation amount, so the heat transfer force to the bathtub B decreases, and as a result, the hot water supply output decreases. It gets bigger.

In addition, water does not flow through the hot water heating heat exchange coil C, and the bathtub B
In the state where only the inside is heated, the hot water temperature near the hot water supply heating heat exchange coil C and the high temperature water outlet path 4a is the same, so even if the heat resistant member 9 may have some flow resistance,
Since the required circulation force is generated, a sufficient amount of circulation with the bathtub B can be ensured.

When the water in the bathtub B is drained, as shown in Fig. 2, water remains in the pot body A up to a height corresponding to the upper edge of the weir 8; The water level is above the inverted U
When the water drops to a level equivalent to the top of the letter-shaped inflow channel 5b, communication between the inflow channel 5b and the atmosphere through the micro holes 6 prevents the siphon phenomenon, ensuring that a predetermined amount of water remains in the pot body A. It is possible to do that.

In this state, when the burner 1 is ignited, the residual water in the pot body A is heated and heated, and the heat exchange coil C for hot water supply is heated. Similarly, hot water can be supplied to the shower head 7, etc.

[Brief explanation of the drawing]

The drawings show an embodiment of the bathtub with a heat exchanger for hot water supply according to the present invention, and FIG. 1 is a longitudinal cross-sectional view of the bathtub filled with water;
FIG. 2 is a vertical cross-sectional view of the bathtub with the water drained out, and FIG. 3 is a vertical cross-sectional view of a conventional bathtub. A...The pot body, B...The bathtub, C...
...Heat exchange coil for hot water heating, 4,5...Circulation pipe, 4a...High temperature water outflow path, 2...
... Heat exchanger, 5a ... Low temperature water flow path, 5b.
...Low temperature water inflow path, 6...Micro hole, 8.
...Plate weir, 9...Heat-resistant member, 12...
...Hot water pipe, 13...Inverted U-shaped plate member.

Claims (1)

[Scope of utility model registration request] One end of the pot body A is equipped with a pair of upper and lower circulation pipes 4 and 5 for forming a natural circulation path of hot water between the bathtub B and a heat exchanger 2 for heating the hot water. In the tube 11,
In a bath pot with a heat exchanger for hot water supply, in which a heat exchange coil C for heating hot water, the other end of which is connected to a hot water supply pipe 12, is installed, the flow from the low-temperature water flow path 5a in the lower circulation pipe 5 to the pot is installed. The low-temperature water inflow path 5b into the main body A is formed by a plate-like base 8 which is erected from the bottom surface of the pot main body A in such a manner that its upper edge protrudes above the lower end of the heat exchange coil C. A plate-like member 13 whose vertical cross section is approximately in the shape of an inverted U is provided on both the front and back surfaces of the plate-like base 8 and on the upper edge at appropriate intervals.
The inverted U-shaped plate member 13 is formed into a substantially inverted U-shape, and a microhole 6 is provided at the top of the inverted U-shaped plate member 13 so as to communicate with the high-temperature water outflow path 4a, thereby draining the water in the bathtub B. The structure is such that water can remain at a height corresponding to the upper edge of the weir 8 in the pot body A in the above-mentioned state, and the inlet of the high-temperature water outflow path 4a in the upper circulation pipe 4 A state in which the lower end edge of the pot body A protrudes downward from the inner upper surface of the pot body A below the upper end edge of the plate-shaped base 8, in the vicinity of the outer circumferential portion of the heat exchange coil C. A plate-shaped heat-resistant member 9 is hung down, and a microhole 1.0 is opened in the upper part of this heat-resistant member 9.
Further, the bath with a heat exchanger for hot water supply is characterized in that a flow path portion 4b communicating with the high temperature water outflow path 4a is formed between the heat resistant member 9 and the inverted U-shaped plate member 13. pot.