JPS6342259Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a gas proportional gas instantaneous water heater, particularly to a constant temperature hot water supply gas water heater.

BACKGROUND ART Hitherto, there have been various types of instantaneous gas water heaters of this kind, and for example, one having the structure shown in FIG. 1 is known.

To explain what is shown in Figure 1, the water supply pipe 6
A water flow rate sensor 7 and an incoming water temperature sensor 8 are installed in the hot water supply line 2, and an outlet hot water temperature sensor 9 and a water flow valve 4 are installed in the hot water outlet pipe 2, and the flow rate Q detected by the water flow rate sensor 7 and the water temperature Tc detected by the inflow water rate sensor 8 are set. Temperature Ts
and the thermal efficiency η of the heat exchanger 10, the feed forward gas amount F ₁ is calculated using the formula F ₁ =Q×(Ts−Tc)/η, and the outlet hot water temperature T _H detected by the outlet hot water temperature sensor 9 is calculated. , set temperature Ts, and proportional gain (constant)
The feedback gas amount F ₂ is calculated using the formula F ₂ = (Ts - T _H ) × α based on α, and the total gas amount F is determined by F = F ₁ + F ₂ . It branches on the downstream side of the valve 4 and directly connects to a water faucet 11 such as a hot water mixer faucet, or connects to the shower 5 via the hot water mixer faucet.

However, the above-mentioned conventional gas water heater has the following problems: the shower is very difficult to use, and it is difficult to supply hot water at two locations.

If you use the shower first and then use the faucet in the other hot water supply pipe, if the shower is in use and the water heater is at its capacity limit, you can use the other faucet to get hot water. Naturally, the water flows through this faucet as well, instantly reducing the amount of hot water on the shower side. As a result, the water temperature in a shower that mixes water at a mixing faucet based on the initial amount of water drops rapidly.

Further, even if the shower usage is below the water heater's capacity limit, the same problem as above will occur if the other faucet is used and the capacity is exceeded.

Even when the shower is being used below the water heater's capacity limit and the other faucet is used, if the required heat load for both is within the water heater's capacity limit, the pressure loss on the shower side will be greater than that of the other faucet. Because it is large, hot water easily flows to the other faucet side, and the amount of hot water on the shower side instantly decreases, causing the water temperature to drop.

If you are using both the shower side and the faucet side and turn off the faucet side, and if both are in use and the water heater is at its capacity limit, water will flow to the faucet side if the faucet side is turned off. Of course, the hot water will instantly flow to the shower side, so the amount of hot water on the shower side will increase and the mixed water temperature will rise.

Further, the same problem as above occurs when the state of use of both is below the capacity limit of the water heater.

If the water heater's capacity limit is exceeded when both are in use, the water flow valve is normally throttled, so if the faucet is turned off, the amount of hot water flowing to the shower will decrease by the amount that is throttled. do. In other words, the rise in the mixed water temperature is also alleviated by that amount.

The purpose of the present invention is to solve the above-mentioned problems and to make it easier to use the shower and to supply hot water at two locations when hot water is supplied at two locations, one of which is on the shower side.

The basic structure of the present invention to achieve the above object is to install a constant flow valve on the shower side to ensure that a fixed flow rate flows through the shower side.

An example of implementing the present invention will be described below based on the drawings. The water heater 1 of this embodiment has a power switch 12.
It ignites when the shower 5 or water faucet 11 is turned on and the shower 5 or faucet 11 is opened.The gas is sent to the burner 14 through the gas supply pipe 13 and burned there, and the water is sent from the water supply pipe 6 to the heat exchanger 10. The hot water is heated here and supplied to the shower 5 and faucet 11 via the outlet pipe 2.

The gas supply pipe 13 is sequentially provided with a solenoid valve 15, a governor 16, and a proportional valve 17 from the upstream side, and the water supply pipe 6 is provided with a water flow sensor 7 from the upstream side.
An incoming water temperature sensor 8 and an outgoing hot water temperature sensor 9 and a water flow valve 4 are provided in the outgoing hot water pipe 2 from the upstream side, respectively.

18 is a control board disposed inside the water heater 1;
Solenoid valve 15 of gas supply pipe 13, proportional valve 17, water flow sensor 7 of water supply pipe 6, incoming water temperature sensor 8, and outlet hot water temperature sensor 9 of hot water exit pipe 2, water flow valve 4
and the power switch 12.
is connected to the power supply via the water flow rate sensor 7, the inlet water temperature Tc detected by the inlet water temperature sensor 8, the preset temperature Ts, and the thermal efficiency η of the heat exchanger 10. Calculate the feedback gas amount F ₂ using the water outlet temperature T _H detected by the hot water outlet temperature sensor 9, the set temperature Ts, and the proportionality constant α, and calculate the feedback gas amount F ₁ . Add the feedback gas amount F ₂ to F ₁ to get the total gas amount F
, and sends a signal A to the proportional valve 17.

The proportional valve 17 receives the signal A and increases or decreases the gas supply amount.

The control board 18 is also configured to send a signal B to the water flow valve 4 to throttle the water flow valve 4 when the water supply temperature cannot be controlled due to the gas flow rate.

This structure is the same as that of the conventional gas water heater shown in FIG. It is characterized in that a constant flow valve 3 is connected to the water faucet 5 on the shower side and is provided in this branched hot water supply pipe 2'.

Thus, when the shower 5 side is opened, if this is within the capability range of the water heater 1, the water flow valve 4 does not change and the flow rate on the shower side does not change either.

However, if the other faucets 11 are opened and the total flow rate exceeds the capacity range, the water flow valve 4 is throttled down to within the capacity range, and the flow rate on the other faucet 11 side is adjusted, but the flow rate on the shower side is It does not change.

In addition, when the shower side 5 is closed and other faucets 11 are open, if the shower side 5 is opened and the capacity is exceeded, the water flow valve 4 throttles the flow rate of the other faucets 11 until it is within the capacity range. The amount and temperature of hot water on the shower side 5 do not change. In the figure, 19 is a fan for forcibly supplying primary air and secondary air necessary for combustion.

Since the present invention has the above configuration, it has the following advantages.

(1) Even if hot water is used at the same time in the shower and at faucets in other places, the constant flow valve and water flow valve keep the flow rate constant on the shower side, so hot water at a constant temperature is poured into the shower side and mixed with water. Even though this water heater is a constant-temperature hot water dispenser, the temperature of the water discharged from the shower does not change, so there is no need to worry about getting burned.

Therefore, the shower is easy to use, and it is easy to supply hot water at two locations with one location serving as a shower.

(2) Regardless of the use of faucets other than the shower side,
Since there is no fluctuation in the flow rate on the shower side, there is no need to install a controller in the bathroom and prioritize the operation of this controller, eliminating the need for an in-bathroom controller and reducing costs.

(3) Since hot water is supplied from two locations, one shower using a constant temperature hot water tap type gas water heater, the main controller board and operation are simple.
In addition, the hot water supply piping can be smaller than the appropriate temperature hot water supply type that supplies hot water at around 42°C, which also reduces costs.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of a conventional gas water heater, and FIG. 2 is a schematic diagram of a constant temperature hot water supply gas water heater showing an embodiment of the present invention. 1...Water heater, 2...Hot water outlet pipe, 3...Constant flow valve, 4...Water flow valve, 5...Shower.

Claims (1)

[Scope of utility model registration request] It is a gas proportional type water heater, and the hot water temperature is determined by the gas amount calculated based on the flow rate, water inlet temperature, set temperature, and heat exchanger efficiency, or the above gas amount is calculated based on the hot water outlet temperature, set temperature, and proportional gain. In a gas water heater that is controlled by the amount of gas added to the amount of gas calculated by the hot water supply system, the hot water supply pipe is branched into two, one of which is connected to the shower via a hot water mixer tap. A constant temperature hot water tap gas water heater, characterized in that a constant flow valve is provided in the hot water tap pipe connected to the shower, and a water flow valve is provided in the other hot water tap pipe.