JPS6338628B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is a bath heating device for commercial or general home use, particularly a heat source device that forcibly circulates hot water between a hot water heating device and a bathtub using a pump. This invention relates to a bath heating system characterized in that a hot water heating device can be installed away from the bathtub.

Configuration of the conventional example and its problems In the conventional forced circulation bath heating device using a circulation pump, the direction of circulation flow in the bath is only one direction. In this one-way circulating flow, a filter is provided at the inlet of the circulating flow in the bathtub to prevent dirt in the bathtub from flowing into the hot water heating device. With this structure, when cleaning the filter, it was necessary to remove the filter and wash it with water, or leave it attached and spray high-pressure tap water onto the filter surface to clean the filter.

In the conventional example above, if you remove the filter and wash it with water, it can be completely cleaned, but if you remove it,
Installation is time consuming and there is a risk of trouble occurring due to forgetting to install it. Furthermore, if the filter is cleaned by spraying tap water onto the surface of the filter while it is still installed, sufficient cleaning will not be possible and the filter will continue to operate with a clogged filter. As a result, the fluid resistance of the circulation circuit increases, the load on the circulation pump increases, especially the load on the suction side of the pump, which causes capitation and noise, and a decrease in heat-light exchange efficiency due to a decrease in the amount of circulating water. It had the following problems.

Purpose of the invention The present invention solves the conventional problems,
In a forced circulation bath heating system, the circulation flow in the bath is configured to have bidirectionality due to the forward and reverse rotation of the circulation pump.When the pump rotates in the normal direction, the flow is in the forward direction and dirt is collected by a filter, and when the pump is in reverse rotation, the flow is in the opposite direction. To provide a forced circulation bath heating device with a self-cleaning mechanism for a filter in which dust collected on the filter is washed away by the flow.

Structure of the Invention To achieve this object, the present invention provides a bathtub, a heater for heating circulating bathwater water, and a circulation path for connecting the bathtub and the heater via a suction unit and a discharge unit attached to the bathtub. piping, and a pump that circulates bathtub water in the forward and reverse directions, the suction unit having an inflow path, and a main body attached to the bathtub, and provided at the inlet of the inflow path of the main body,
A filter located inside the bathtub and a gap between the inner wall surface of the inflow channel and a gap for flowing water are provided in the inflow channel, and are opened during forward circulation of the bathtub water and closed during cleaning during reverse circulation. and a check valve that allows bath water to pass through the gap and collide with the filter. As described above, by rotating the circulation pump in the forward and reverse directions and by providing a check valve in the flow path of the suction unit, conventional problems such as clogging and problems that occur during filter cleaning are solved.

Configuration of Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 7.

Figure 1 shows a system diagram of a forced circulation bath device.A bathtub 1 has a drain port 2 for draining the water in the bathtub.When the bathtub 1 is used, the drain port 2 is sealed with a lid 3 to drain the water. It is becoming more and more fulfilling. Furthermore, a suction unit 5 and a discharge unit 6 are attached to the bathtub 1 for connecting the bath heater 4 and the bathtub 1 in a waterway manner. Suction unit 5, discharge unit 6
is connected to the bath heater 4 via pipes 7 and 8 in a waterway manner. A forward/reverse circulation pump 9 using a vane type pump or the like that exhibits sufficient pumping performance during forward and reverse rotation is attached to the piping 7. The circulation pump 9 has a suction unit 5 on the suction side, a temperature control solenoid valve 10 on the discharge side, and a flow rate switch 11 on the downstream side thereof.
Further downstream, a heat exchanger 12 is coupled, and the downstream side of the heat exchanger 12 is connected to the piping 8. On the discharge side of the circulation pump 9, a bypass passage 13 and a reverse water passage 14 that bypass the heat exchanger 12 further branch from before the temperature control solenoid valve 10, and the bypass passage 13 has a bypass valve 15 and a reverse water passage 14, respectively. A check valve 16 is inserted into 14 and connected to piping 8 .

A burner 17 is provided below the heat exchanger 12 to heat the heat exchanger 12, and a fuel solenoid valve 18 for controlling the supply of heat to the burner 17 is provided. A temperature sensor 19 that detects the temperature of water flowing inside the pipe 7 is provided integrally with the pipe 7.

Figure 2 shows the suction unit, suction unit 5
The check valve 2 has an inflow passage 21 and has a gap 23 between the inflow passage 21 and the inflow passage inner wall surface 22.
4 are arranged. 25 is a check valve 24 support frame that fixes the check valve 24 and also fixes a filter support plate 27 for fixing the filter 26. A fixing nut 28 fixes the suction unit 5 to the bathtub wall 29.

FIG. 3 shows a front view of the check valve section, and FIG. 4 shows a perspective view. In the figure, the check valve 24 attached to the check valve support frame 25 is made of a conical elastic body such as rubber, has a cross-shaped cutout 30 at the tip of the cone, and has a forward and reverse flow characteristic. It is beginning to show that

Figure 5 shows the control circuit, which is turned on by the flow rate sensor 31 after the main switch _SW .
A circulation pump 9 with a fuel solenoid valve 18 that is turned off, a forward/reverse switch 32, a temperature control solenoid valve 10 that is turned on and off by a motor 33 and a temperature sensor 19.
A temperature control solenoid valve 10 is connected in parallel.

Figure 6 shows the forward flow during bath water heating circulation.
FIG. 7 shows the flow in the reverse direction during self-cleaning of the filter.

In the above configuration, the drain port 2 is covered with a lid 3 and the bathtub 1 is filled with water. Next, the forward/reverse changeover switch 32
When the pump is placed in forward rotation A side and the main switch _SW is turned on, the circulation pump 9 starts operating. Air, water, etc. in the pipe 7 are pushed to the discharge side of the circulation pump 9. If a vane type pump is used as the circulation pump 9, the efficiency of the pump during forward and reverse rotation can be increased, and the above-mentioned air discharging action can be performed effectively.

In the early stage of circulation, the temperature sensor 19 is cooled and in the ON state because there is no heating. Therefore, the temperature control solenoid valve 10 is turned on, and the air and water pumped by the circulation pump 9 flow to the heat exchanger 12. When the air has finished discharging and only water is circulating,
The flow rate switch 31 turns on, and the fuel solenoid valve 18 turns on.
Turn on. Then, gas supply to the burner 17 is started, the burner 17 starts combustion, and the heat exchanger 12
heat up. The water in the heat exchanger 12 is heated to become hot water and sent to the bathtub 1 through the piping 8, so that the water in the bathtub 1 is continuously heated. When the temperature of the water in the bathtub 1 rises and reaches the set value of the temperature sensor 19, the temperature control solenoid valve 10 is closed. The circulating water has a water pressure higher than the set pressure of the bypass valve 15 provided in the bypass passage 13, and flows to the bypass passage 13,
It reaches piping 8 and returns to bathtub 1. When the circulating water flows into the bypass passage 13 due to the blockage of the temperature control solenoid valve 10, the flow rate sensor 31 turns OFF, and the fuel solenoid valve 1
8 is closed, gas supply to the burner 17 is stopped, and heating is stopped.

FIG. 6 shows the flow in the suction unit 5 during forward flow when performing this circulation heating operation. The water or warm water in the bathtub 1 reaches the filter 26 (flow
F ₁ ), after passing through the filter 26, the inflow path 21
flows into. At this time, the flow is in the forward direction with respect to the check valve 24, so in the inflow path 21, it flows through the entire cross section of the inflow path 21, including the flow at the check valve 21 portion (flows F ₂ , F ₃ ). . Maintain the above flow condition,
Garbage collection is performed in the bathtub 1, which circulates and heats the bathwater.

Next, when cleaning the filter 26 by causing the flow to flow backwards, the forward/reverse changeover switch 32 shown in FIG. 5 is set to the reverse direction B side. The flow path on the heat exchanger 12 side is equipped with a bypass valve inserted into the bypass path 13 due to the non-return property of the flow rate sensor 31 (a check valve may be inserted into the heat exchanger 12 circuit if necessary). 15 prevents the flow of water or hot water. On the other hand, the reverse waterway 14 is in the forward direction of the check valve 16. As a result, water in the bathtub 1 flows from the discharge unit 6, passes through the piping 8, the reverse channel 14, the circulation pump 9, and the piping 7, and returns to the bathtub 1 from the suction unit 5. FIG. 7 shows the flow in the suction unit 5 during this reverse flow. The flow pumped by the circulation pump 9 reaches the inlet channel 21 of the suction unit 5 (flow F ₄ ).
Since this flow F ₄ flows in the opposite direction to the check valve 24, the inner wall surface 22 of the inflow passage 21 and the check valve 24
(flow F ₅ ). Therefore, the flow velocity in the gap 23 becomes faster and becomes a jet flow (flow F ₆ ) and collides with the filter 26 surface. The dust collected on the surface of the filter 26 is peeled off from the filter 26 by this jet energy. As a result, the filter 26 is efficiently cleaned, and dirt is carried away with the bathwater out of the bathtub during draining.

Effects of the Invention As described above, by using a circulation pump, the circulation flow is reversed by forward and reverse rotation of the pump, and a check valve is provided in the flow path in the suction unit, thereby achieving the forced circulation bath system of the present invention. has the following effect.

(1) Since the filter can be cleaned simply by the reverse flow of the circulating flow, it is not only easy to clean the filter, but also prevents damage to the equipment due to dirt entering the equipment due to forgetting to reinstall the filter during cleaning. (2) Cleaning can be done by simply rotating the pump in reverse, allowing frequent cleaning and keeping the filter clean at all times. Furthermore, it is possible to prevent an increase in noise due to an increase in the load on the circulation pump caused by clogging of the filter, an increase in energy loss due to a decrease in the circulation flow rate, and the like.

(3) When cleaning the filter, the check valve closes and the passage through which the bathtub water flows becomes a gap formed between the check valve and the inner wall of the inflow passage, and the cross-sectional area is narrower than usual, and the passage through which the bath water flows becomes a gap. As a result, a high-speed jet is made to collide with the filter, making it possible to further enhance the cleaning effect.

(4) The filter is located inside the bathtub, so
This prevents dust from entering the pump, heater, etc., improving the reliability of the equipment, and since the dust removed by cleaning falls inside the bathtub, it can be discharged together with the bathtub water, making it easier to dispose of.

[Brief explanation of drawings]

Fig. 1 is a system diagram of a forced circulation bath device that is an embodiment of the present invention, Fig. 2 is a sectional view of the suction unit of the same device, and Fig. 3 is a check valve disposed in the suction unit. 4 is an external perspective view of the check valve, 5 is a control circuit diagram of the bath equipment, and 6 is a front view of the check valve.
The figure shows the flow state of the suction unit in the forward direction, and FIG. 7 shows the flow state of the same suction unit in the reverse direction. DESCRIPTION OF SYMBOLS 1... Bathtub, 4... Heater, 5... Suction unit, 9... Circulation pump, 23... Gap part, 24...
...Check valve, 26...Filter.

Claims (1)

[Scope of Claims] 1. A bathtub, a heater for heating circulating bathtub water, piping for a circulation path connecting the bathtub and the heater via a suction unit and a discharge unit attached to the bathtub, and a bathtub water heater. The suction unit has a main body that has an inflow path and is attached to the bathtub, and a filter that is provided at the inlet of the inflow path of the main body and located inside the bathtub. and a gap between the inner wall surface of the front inflow channel and the inflow channel, which is opened when the bath water is circulated in the forward direction, and closed during cleaning when the bath water is circulated in the reverse direction, so that the bath water passes through the gap. A forced circulation bath device comprising a check valve that causes the filter to collide with the filter. 2. The forced circulation bath device according to claim 1, wherein the check valve is made of a conical elastic body, and has a slit at the tip of the cone.