JPH0387560A - Hot-water supply apparatus - Google Patents

Abstract

PURPOSE:To perform control even at a low flow rate regardless of open or close of bypass valve by method wherein when the total flow rate is reduced with the bypass valve open, the bypass valve is further moved in the opening direction. CONSTITUTION:When the set temperature of a controller 49 is set at a low temperature, a motor 50 is brought in operation and a valve disc 33 is opened. At this time, the valve disc is moved to the left and a stem provided on the valve disc 33 opens a valve disc 43 of a bypass valve 41 to divide water flowing from an inlet 22 into two streams toward a heat exchanger 25 and a bypass pipe 45. With the bypass valve open, control of the total flow rate is performed by adjusting the clearance between a circular flow path 31 and a diverging circular cone 34. At this time, as the bypass valve 41 is in full-open state and the inlet pressure is high, the opening of the bypass valve 41 can be set wide even when the clearance is set narrow. Therefore, the total flow can be reduced to a low flow rate with the bypass valve 41 full open.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a water heater that turns cold water into hot water.

Conventional technology Conventionally, this type of technology is known, for example, from Japanese Patent Publication No. 60-259854.
This is shown in the publication. In FIG. 5, l is a water flow controller, and the water that enters from the water inlet 2 flows in the order of the inlet valve chamber 3 of the water flow controller → the outlet valve chamber 4 → the heat exchanger 5 → the outlet pipe. 5, heat is exchanged from cold water to hot water. The inlet valve chamber 3 and the outlet valve chamber 4 are provided with a main control well 7, and the main control hole 7 is provided with a main control valve 8. A valve stem 10 having a locking ring 9 is fixed to the main control valve 8 . Further, the outlet valve chamber 4 and the hot water outlet pipe 6 are communicated with each other through a bypass path 11, and a return spring 1 is provided in the middle of the bypass path 11.
A bypass control valve 13 energized by 2 is provided. The valve stem 10 is connected to a motor 15 via a ring mechanism 14.
is connected to. 16 is a water amount detector, 17 is a burner,
18 is a hot water temperature setting device, 19 is a hot water supply controller, and 20 is a heating controller. 21 and 22 are an input losser detector and an output thermistor, respectively. To explain the operation of the conventional example configured in this way, when the set temperature of the outlet hot water temperature setting device 18 is as high as 70° C., the bypass control valve 13 is in a closed state as shown in FIG. 4. In this state, when the faucet (not shown) at the end of the hot water tap pipe 6 is opened, the water flow detector 16 detects the flow, and the burner 17 is not burned, but the heat exchanger 5 exchanges heat and hot water is supplied from the hot water tap pipe 6. It turns out. At this time, the main control valve 8 moves as follows. That is, since the combustion amount of the burner 17 is determined, the temperature set by the outlet hot water temperature setting device 1B is determined, and the inlet water temperature is measured by the input losser ξ star 21, the required flow rate can be calculated. Therefore, the flow rate is calculated by the main control valve 8 based on the flow rate calculated in this way! There will be 11 sections. When reducing the flow rate, the main control valve 8 and the main control valve hole 7 are removed by driving the motor 15 and pulling the valve stem 1o upward in the figure.
The interval between the two becomes narrower and the flow rate decreases. At this time, the flow rate is reduced to the required flow rate while being measured by the water amount detector 16. The distance between the main control valve 8 and the main control hole 7 when adjusting the flow rate differs depending on the pressure of the inlet channel 2 and the large mouth valve chamber 3 even when the same flow rate is set. When the pressure is high, the interval is narrow, and when the pressure is low, the interval is wide.
) Explain the behavior when set. At this time, the hot water temperature is set low, so a large amount of hot water can be obtained.

Therefore, the motor 15 operates to move the valve body 10 downward in the figure. As a result, the locking ring 9 comes into contact with the bypass control valve 13 and pushes the return spring 12, thereby opening the bypass control valve 13.

At this time, the flow of water entering from the inlet channel 2 is divided into a flow through the heat exchanger 5 and a flow through the bypass path 11. At this time, the ratio of the flow rate flowing to the five heat exchangers and the bypass path ll side is constant, but the total flow rate is iu
y will be done.

Problems to be Solved by the Invention However, in the conventional example, problems arise when controlling the total flow rate. That is, the main control hole 7 and the main control valve 8 need to have a certain degree of opening when the bypass control valve 13 is closed and the locking ring 9 is in contact with the bypass control valve 13. (To perform quality control when setting a high temperature) Now, with the bypass control valve 13 open, if the pressure in the inlet channel 2 is high, the total flow rate will increase, so move the main control valve 8 upward in the diagram. However, the distance between the main control hole 7 and the main control valve 8 is narrowed to reduce the flow rate. At this time, the opening degree of the bypass control valve 13 also becomes small, causing a problem in that the flow rate flowing through the bypass path 11 decreases. In addition, in the conventional example, the flow node of the main control valve 8 is configured at one location, so even when the locking ring 9 is in contact with the bypass control valve 13, the main control hole 7 and the main control valve 8 are constant. Therefore, when the bypass control valve 13 is open and the pressure in the inlet channel 2 is high, it is impossible to reduce the flow rate to a small amount.

Therefore, an object of the present invention is to provide a water heater with excellent controllability that can reduce the flow rate to a small amount even when the bypass control valve is open or closed at high water pressure. It is something to do.

Means for Solving the Problems In order to achieve the above objects, the present invention includes a burner, a heat exchanger that converts cold water into hot water using the burner, a water inlet pipe to the heat exchanger, and a water inlet pipe from the heat exchanger. The hot water outlet pipe and the water entry front intake have a valve body that is provided in either of the hot water outlet pipes and moves in two directions, forward and reverse, and when moving in the two directions, the flow rate is controlled at two locations respectively.Flow control A valve, a driving means for driving the flow rate control valve, a bypass pipe for communicating the water inlet pipe and the hot water outlet pipe, a hot water temperature setting device for setting the temperature of hot water discharged from the hot water outlet pipe, and a hot water temperature setting device provided in the bypass pipe. A bypass valve is provided that changes the flow rate in conjunction with the flow rate control valve according to the set temperature of the hot water temperature setting device.

Operation The control valve of the present invention has the above-mentioned configuration, so that the flow control position of the flow control valve is independent when the bypass valve is opened and when it is closed, and when the total flow rate is reduced with the bypass valve open, the bypass Since the valve is moved in the direction of opening the valve further, the flow rate can be controlled down to a small flow rate regardless of whether the bypass valve is opened or closed.

Example Hereinafter, one embodiment of the present invention will be described based on the drawings.

In Figures 1 to 4, 21 is the valve body;
The valve body 21 is provided with an inlet 22 and an outlet 23, and from the outlet 23 there is a water flow sensor 24 and a heat exchanger! S2
5. It is piped to the hot water outlet 26. Inside the valve body 21, an upper pressure chamber 27, a secondary pressure chamber 28, the primary pressure chamber 27, and the secondary pressure chamber 28 are connected to each other from a communication portion 29 to the bottom of the tank. This communication portion 29 includes a reduced conical flow path portion 30 whose flow path area gradually decreases downstream from the primary pressure chamber 27;
A cylindrical flow path portion 31 having a constant flow path area is formed from the reduced conical flow path portion 30, and a cylindrical flow path portion 31 having a constant flow path area is formed from the cylindrical flow path portion 31, and the secondary pressure chamber 28 is formed from the cylindrical flow path portion 31.
The bottom of the tank is formed by an enlarged conical flow path section 32 whose flow path area gradually increases. Further, in the communication portion 29, the communication portion 29
A valve body 33 that slides is provided. The valve body 33 includes an enlarged conical part 34 whose cross-sectional area gradually increases downstream from the primary pressure chamber 27, a cylindrical part 35 whose cross-sectional area is constant from the enlarged conical part 34, and a cylindrical part 35 whose cross-sectional area is constant. The tank bottom is formed by a reducing conical part 36 in which the cross-sectional area of the valve body gradually decreases from the part 35 to the secondary pressure chamber 28. Then, the cone angle of the reduced conical flow path portion 30 of the communication portion 29 and the cone angle of the reduced cone portion 36 of the valve body 33 are made the same angle, and the cone angle of the expanded conical flow path portion 32 and the The conical angles of the enlarged conical portion 34 of the valve body 33 are made to be the same angle. Further, the valve body 33 is provided with a guide plate 37, and this guide plate 37 guides when sliding inside the cylindrical flow path portion 31. The valve body 33 is connected to a piston 38,
This piston 38 constitutes a pressure chamber 39 into which the pressure of the secondary pressure chamber 28 is introduced. 40 is an introduction hole. 4 more
1 is a bypass valve, and a valve body 43 biased by a spring 42 is provided inside this bypass valve 41. 44
is a shaft body for opening the bottom of the valve body 43;
3.

The bypass valve 41 is connected to the hot water supply outlet 026 by a bypass pipe 45. 4G is a controller, and this vI controller 46 is connected to an inlet water temperature sensor 47 and an output hot water supply unit.
Signals from the heater 48, the controller 49, and the water sensor 24 are input, and the objects to be controlled are the motor 50 and the burner 51.
There is a gas control valve 52 etc. for controlling the gas. Reference numeral 53 denotes a biasing spring.First, the operation in one embodiment of the present invention will be described. For example, set the temperature of the controller 49 to 70'C.
Then, the motor 50 operates and the valve body 33 is in the state shown in FIG. At this time, the bypass valve 41 is in a closed state, 70
In order to obtain a hot water temperature of It! 11! It is something to do. Primary pressure chamber 27
When the pressure of
0 is stopped and i amount control ends. On the other hand, when the temperature setting of the controller 49 is set to a low temperature of 40° C., the motor 50 is activated and the valve body 33 is in the state shown in FIG. 4. At this time, the valve body 33 moves to the left side in the diagram, and the shaft body provided on the valve body 33 opens the valve body 43 of the bypass valve 41, and the water flowing from the population 22 flows into the heat exchanger 25 and the bypass pipe 45. Diverted. The total flow rate control when the bypass valve 41 is open is performed using the circular pipe passage section 31 and the enlarged conical section 34 of the valve body 33.
This is done at intervals of At this time, the bypass valve 41 is in a fully open state, and the inlet pressure increases, so even if the interval is narrowed, the opening degree of the bypass valve 41 can be increased. In other words, the total flow rate can be reduced to a small flow rate with the bypass valve 41 fully open.

Effects of the Invention As described above, the present invention provides a burner, a heat exchanger that converts cold water into hot water using the burner, a water inlet pipe to the heat exchanger, a hot water outlet pipe from the heat exchanger, and the water inlet pipe. Alternatively, a flow rate control valve that is provided in either of the hot water taps and has a valve body that moves in two directions, forward and reverse, and controls the flow rate at two locations when moving in the two directions, and a drive that drives the flow rate control valve. means, a bypass pipe communicating the water inlet pipe and the hot water outlet pipe, a hot water temperature setting device for setting the hot water temperature of the hot water outlet pipes, and a hot water temperature setting device provided in the bypass pipe and setting the hot water temperature setting device according to the temperature setting of the hot water temperature setting device. By providing a bypass valve that changes the meteor in conjunction with the flow rate control valve, the valve body moves in the positive direction when the bypass valve is closed, making it possible to control the flow rate down to a small flow rate. When the valve body is in this state, the valve body moves in the opposite direction and the bypass valve can maintain the open state sufficiently while controlling the flow rate down to a small flow rate, creating a water heater with excellent flow control function even when the inlet pressure becomes high. It is something that can be obtained.

[Brief explanation of drawings]

FIG. 1 is a circuit configuration diagram of a water heater showing an embodiment of the present invention, FIG. 2 is a perspective view of a valve body, FIGS. 3 and 4 are circuit configuration diagrams showing the same flow rate control state, and FIG. The figure is a circuit configuration diagram showing a conventional water heater. 21...Flow control valve (valve body), 22...
...Inlet, 25...Heat exchanger, 26...
...Hot water pipe (hot water supply outlet), 41...Bypass valve, 45...Bypass pipe, 49...t
lk'lA setting device, 50... Drive means (motor).

Claims (1)

[Claims] A burner, a heat exchanger that uses the burner to turn cold water into hot water, a water inlet pipe to the heat exchanger, a hot water outlet pipe from the heat exchanger, and a forward and reverse direction provided in either the water inlet pipe or the hot water outlet pipe. a flow control valve having a valve body that moves in two directions and controls the flow rate at two locations when moving in the two directions; a driving means for driving the flow control valve; and a drive means for driving the water inlet pipe and the hot water outlet pipe. a bypass pipe that communicates with the hot water; a hot water temperature setting device that sets the hot water temperature from the hot water exit pipe; and a hot water temperature setting device that is provided in the bypass pipe and changes the flow rate in conjunction with the flow rate control valve according to the set temperature of the hot water temperature setting device. A water heater consisting of a bypass valve.