JPS59150248A - Water heating apparatus for bath - Google Patents

Abstract

PURPOSE:To improve thermal efficiency and heat recovery rate of a water heating apparatus for a bath, by arranging many thin pipes in a zigzag pattern in a hot water tank, and providing a float lid having heat insulating and waterproof property so that the lid is floated and moved in response to the up and down change of the surface of the hot water in the tank. CONSTITUTION:Many thin pipe groups 2 are arranged in a zigzag pattern in a hot water tank 1. Both ends of the thin valve group 2 are connected to a distributing tank 3 and a collecting tank 4. A float lid 8 is constituted by a member having excellent heat insulating and waterproof property, and provided in such a way that it is floated and moved in response to the up and down movement of the surface of the hot water in the tank. Therefore, the heat exchange efficiency of the hot drained water and the cool water is improved. Since the heat dissipation from the surface of the hot water in the tank is prevented, the heat recovery rate can be improved.

Description

[Detailed description of the invention] The present invention relates to improvements in hot water equipment for baths.

In conventional bath water heating systems used in public bathhouses, the source of waste water is generally located close to the ground, and the source water is led to a hot water tank, and after heat exchange, the waste water is discharged into the sewer. Due to the structure of the hot water tank, the head difference between the inlet and outlet of the hot water tank is small (Lj), but since the natural flow method is adopted, it is difficult to increase the flow velocity at the source, and this is inevitable. The heat transfer rate is small.

Therefore, in order to obtain a large amount of heat transfer, it is necessary to have a large heat transfer area, which has the drawback of increasing the size of the entire hot water tank and requiring a large amount of materials, resulting in high costs. In addition, the hot water that is the heat source is dirty, so the heat transfer surface is very dirty and must be cleaned frequently. Moreover, the hot water tank is usually made of water or concrete, and is an open top with an open top. Because it was a concentrated system, there was a lot of heat leakage to the outside world, resulting in poor thermal efficiency.

The present invention was developed based on the above-mentioned circumstances, and its purpose is to guide waste water discharged from a bathhouse to a hot water tank equipped with a heat exchanger, and to use the heat exchanger to discharge hot water. In a hot water device for a bath that recovers the amount of heat contained in The hot water is supplied into the thin tubes and led out from the other end, and the υ1 hot water is introduced into the hot water tank from above the group of thin tubes. By configuring it so that it can float up and down in response to changes in the top and bottom of the surface, it is possible to downsize the entire device and reduce manufacturing costs, while minimizing heat leakage and increasing thermal efficiency. To provide a hot water device for a bathhouse which is wide in width and can be easily cleaned.

To explain the structure of the present invention with reference to an embodiment shown in the drawings, it is a lid hot water tank, and this hot water tank 1 is made of a material with excellent heat insulation properties, such as perlite mortar, and the inside of the tank is coated with a high-quality waterproofing agent. It is coated with a molecular resin paint to prevent water absorption.

Note that it is also possible to configure the hot water tank 1 with a heat-resistant reinforced resin.

The cross-sectional shape of the hot water inn 1 is an inverted trapezoidal shape as shown in Figures 2 and 3, and a drain groove 1a is provided in an inclined manner at the bottom of the tank, and the end side is a drain tank! An overflow port IC is provided at the upper end of the drain water reservoir Jib, which communicates with the water tank Jib.

Reference numeral 2 denotes a group of thin tubes arranged in a staggered manner in the hot water tank 1, and both ends of each pipe 2' are connected to a distribution tank 3 and a collection tank 4, respectively. Reference numeral 5 denotes a cold water introduction pipe connected to the distribution tank 3, and one end of which is connected to a water pipe or the like. Reference numeral 6 denotes a hot water outlet pipe, the lower part of which is submerged in the collecting tank 4, and the hot water in the collecting tank 4 is fed to a pump (not shown), and is an outlet through which sewage is discharged through the outlet pipe 6. .

Reference numeral 8 denotes a float lid. The float lid 8 is made of a material having high heat and waterproof properties, and floats according to changes in the top and bottom of the hot water level in the tank.

Next, the operation of the present invention will be explained. The first priority is the draining water from the bathhouse.
As indicated by arrow A in the figure, hot water is supplied into the hot water tank 1 from above on the side of the hot water outlet pipe 6, and cold water is introduced from the water supply etc. into the distribution tank 3 via the cold water introduction pipe 5. The cold water introduced into the distribution tank 3 passes through each capillary tube 2/, 2/,... and is collected in the collection tank 4, but heat exchange takes place during the process of passing through the capillary tubes 2', and the amount of heat contained in the waste water is absorbed. Hot water is collected in the collecting tank 4 for the purpose of taking away the hot water. Then, hot water is taken out through the hot water outlet pipe 6 with the hot water temperature being averaged.

In addition, the waste water that has flowed into the hot water tank 1 as indicated by arrow A in Fig. 1 flows around the narrow tube group 2 arranged in a staggered manner, flows into the waste water groove 1a at the bottom of the tank, and is then collected in the waste water reservoir 1b. It is discharged to the outside of the tank from the overflow port 1c.

By the way, when a water heater is used in a bathhouse, the source temperature of the discharged water is generally IrJ, 40. The cold current is around 15℃ to 18℃ per year if it is well water, and about 19℃ in summer if it is water supply.
The temperature in the winter is about 5°C, and since it is usually used outdoors in most cases, the ambient temperature may be about 30°C in the summer, but as high as 5°C in the winter. Conventional hot water tanks are usually - side (
Since the structure is such that the top surface (top surface) is in contact with the air and the other five surfaces are grounded, surrounding this large surface with heat insulating material will greatly reduce heat leakage.

On the other hand, to explain the aspect of heat exchange in the present invention, when the overflow and the cold flow flow in an equal ratio of 1 to 1, the overflow flows obliquely over a short distance, and the cold flow extends over the entire length inside each capillary 2'. By flowing over a long distance, there is a large overflow locally that exchanges heat with the cold stream in the evening view, and the cold stream receives heat more quickly, further increasing the heat transfer coefficient of the heat exchanger. It is possible. In addition, since the thin tube group 2 in the hot water tank 1 is a staggered pipe, it increases the resistance of overflow flowing outside and easily forms a vortex, and the waste water flowing into the hot water 41I flows into the thin tube group 2 and locally This creates a swirling flow, and the hot fluid that comes into contact with the heat transfer surface quickly leaves the heat transfer surface, increasing the amount of heat passing through and improving the heat exchange function. Further, the fact that the cross-sectional shape of the hot water tank 1, which serves as a flow path for overflow, is an inverted trapezoid also helps to increase resistance to overflow.

Furthermore, when cleaning the thin tubes 2', 2'... with pressure water, the pressure water is piped in a staggered manner to the thin tubes 2/, 2/...
Since the particles collide with the particles and are dispersed vigorously in many directions, the dirt from the thin tubes can be effectively removed, making cleaning easier.

As described above, the present invention provides a hot water system for a bathhouse in which waste water discharged from a bathhouse is guided to a hot water tank equipped with a heat exchanger, and the heat amount of the waste water is recovered by the heat exchanger.
The hot water tank is formed of a heat insulating material, and a large number of thin tubes are arranged in a staggered manner in the hot water tank, and cold water is supplied into the thin tubes from one end of the group of thin tubes and led out from the other end. At the same time, the hot water tank is configured so that the discharged hot water is introduced into the hot water tank from above the group of thin tubes, and the hot water tank is configured to have a float lid that has an insulating and waterproof property and is configured to float freely up and down in response to changes in the top and bottom of the hot water level in the tank. As a result, heat leakage can be minimized, and the rate of heat reception during cooling can be accelerated, further increasing the heat transfer coefficient.In addition, a swirling flow is forcibly formed at the source of the waste water introduced into the hot water tank. As a result, the heat passing rate can be further increased, and the performance as a heat exchanger can be significantly improved.This allows the entire equipment to be made smaller, and also achieves a reduction in manufacturing costs. This has the advantage that cleaning can be carried out easily.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional side view of the present invention, and FIGS. 2 and 3 are
4 is a side view showing the mounting structure of the thin tube group, FIG. 5 is a front view of the distribution tank, and FIG. 6 is a longitudinal sectional side view of the hot water tank. In the figure, 1 is a hot water tank, 2 is a group of tubules, 2/, 2/...
is a thin tube, and 8 is a float lid.

Claims (1)

[Claims] In a hot water device for a bath, the hot water discharged from the bath is guided to a hot water tank equipped with a heat exchanger, and the heat of the waste water is recovered by the heat exchanger, and the hot water tank is formed of a heat insulating member. A large number of thin tubes are arranged in a staggered manner in the hot water tank, and cold water is supplied into the thin tubes from one end of the group of thin tubes and led out from the other end. A hot water bath for a bath, characterized in that the hot water tank is configured to be introduced into the hot water tank from above, and the hot water tank is configured to have a float lid having heat insulating and waterproof properties so as to be able to float up and down in response to changes in the top and bottom of the hot water level in the tank. Device.