JPH03117827A - Hot water feeding device - Google Patents

Abstract

PURPOSE:To provide a superior safety, a superior responding characteristic and facilitate adjustment of flow rate by a method wherein a driving device is controlled in response to signals got from a temperature sensor and a temperature setting device, a control valve is controlled in response to signals from a flow rate sensor and a flow rate setting device, a driving gain of a driving device is adjusted in response to a signal from the flow rate sensing device and the driving of the driving device is stopped when a hot water feeding is stopped. CONSTITUTION:When a plug 21 is opened and a hot water feeding is carried out, a temperature set signal set by a hot water feeding controller 23 is compared with a hot water temperature mixing signal sensed by a temperature sensing device 34 by a controlling device 24, and a mixing valve 36 is driven by a motor 31 to a position where a difference between both signals becomes zero. A set value of an amount of hot water is compared with a signal from a flow rate sensor 35 and then a control valve 42 is controlled. As the plug 21 is closed to stop feeding hot water, the flow rate sensor 35 may detect stoppage of flow and stop the driving of the motor 13 through the controller 24. After stopping of feeding of hot water, even if the temperature of the temperature sensing part 34 is lowered, the mixing valve 36 opens its hot water feeding side, but does not throttle the water side. During a re-feeding of hot water, if the plug 21 is opened, the flow of water is generated, this state is detected by the flow rate sensor 35 and the motor 31 is electrically excited. When the re-feeding of hot water is carried out, the hot water is not fed temporarily, but the mixing valve is operated from its appropriate position.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a water heater that mixes hot water and water, supplies hot water at a set temperature, and adjusts the flow rate.

2. Description of the Related Art Conventionally, this type of hot water mixing device has been constructed as shown in FIG. That is, in FIG. 3, the valve shaft 1 is moved forward and backward by the drive of the servo motor 2. 3
is a double-sided pulp on the hot water side that adjusts the amount of high-temperature hot water, and a double-sided valve 3 on the hot water side is fixed to the tip of the valve shaft 1. Reference numeral 4 denotes a single-sided valve on the water side for adjusting the amount of cold water, and a spring 5 is interposed between it and the double-sided valve 3 on the hot-water side, so that it can be moved only in the direction of the double-sided valve 3 on the hot-water side with respect to the valve shaft l. . Further, 6 is one hot water side sheet formed at the outlet of the hot water supply path 8 in the hot water side valve chamber 7, and 9 is the other hot water side sheet formed in the hot water side valve chamber 7 opposite to the hot water side sheet 6. The hot water side seat 9 is also disposed between the hot water side valve chamber 7 and a mixing chamber 11 to be described later. The double-sided valve 3 on the hot water side is installed between these two hot water side seats 6.9, and the double-sided valve 3 on the hot water side mutually approaches and separates from the two hot water side seats 6.9 by moving the valve shaft l forward and backward. 10 is a water side sheet formed at the outlet of the water supply channel 12 in the mixing chamber 11 which also serves as a water side valve chamber; In this case, the water side single-sided valve 4 approaches and separates by moving the valve shaft 1 back and forth to change and adjust its opening degree. Mixed hot water, which is a mixture of hot water and water, is supplied from a mixed hot water outlet path 13, and this mixed hot water outlet path 13 is provided with a hot water temperature sensing sensor 14. 15 is a hot water supply heat source machine.

The operation of this conventional example is to detect the mixed water temperature using the outlet hot water temperature sensor 14 and to operate the hot water side double-sided valve 3 using the servo motor 2 so that the hot water temperature set by a temperature setting device (not shown) can be obtained. The water-side single-sided valve 4 is driven to change the mixing ratio of hot water and water. When the mixed hot water temperature is lower than the set value, the valve stem l moves to the right in the figure, and the water side single-sided valve 4 narrows down the water supply channel 12, and at the same time, the hot water side double-sided valve 3 opens the hot water supply channel 8.
Move to the position where the set value can be obtained. If the mixed water temperature is higher than the set value, move in the opposite direction.

If the hot water heat source device 15 is an instantaneous type, if a large amount of hot water is dispensed, the heating cannot keep up, and if the temperature of the hot water drops below the set value even when the water is fully closed, the valve stem will move significantly to the right. , the hot water side double-sided pulp 3 approaches the hot water side sheet 9. As a result, the flow of water passing through the hot water supply heat source device 15 is restricted, and the hot water temperature can be obtained as per the set value.

Problems to be Solved by the Invention Since this conventional hot water mixing device was constructed as described above, it had the following problems.

(1) Since there is no means to detect whether hot water is being supplied or not, when the mixed hot water outlet passage 13 cools down due to natural cooling when hot water supply is stopped, the hot water temperature sensor 14 detects this and the pulp absorbs hot water. Because it moves so that the ratio increases,
When refilling the water supply, hot water would temporarily come out, which was dangerous, and it took time to move to a position where the appropriate temperature could be obtained.

(2) Since the flow rate was adjusted manually, it was difficult to operate, and remote control was also impossible.

(3) Control could not be performed with the optimal drive gain according to the flow rate 0 For example, when the flow rate decreases, the mixed hot water comes out from the hot water temperature sensor 1
It took a long time to reach 4, and the degree of mixing deteriorated, so unless the gain was lowered, excavation would occur. When adjusting the gain for low flow rates, there were problems such as it took time to correct overshoots and undershoots when water pressure fluctuated in the normal flow range, and the peaks also increased.

It is an object of the present invention to provide a water heater that solves these conventional problems and has excellent safety and responsiveness, stable control, and easy adjustment of flow rate.

Means for Solving the Problems In order to achieve the above objects, the water heater of the present invention includes a mixing valve, a driving device for driving the mixing valve, a flow rate detector for detecting the temperature of the mixed water, and a flow rate detector for detecting the temperature of the mixed water. a temperature setting device to set the flow rate, a flow rate detector to detect the mixed flow rate, a control valve to control the flow rate of the mixed hot water, a flow rate setting device to set the flow rate of the mixed hot water, and signals for the flow rate detector and temperature setting device. , the control valve is controlled based on the signals from the flow rate detector and the flow rate setting device, and the drive gain of the drive device is adjusted based on the signal from the flow rate detector. The device is configured to include a controller that performs control to stop driving the device.

Operation With the above-described configuration, the water heater of the present invention can obtain the arbitrary 2itt set by the flow rate setting device by adjusting the control valve with the controller, and can also adjust the drive gain of the drive device that drives the mixing valve according to the flow rate. This system provides a stable mixed water temperature even when the flow rate changes, and also stops the drive device when hot water supply is stopped, preventing hot water from being temporarily supplied when hot water is restarted, ensuring safety and responsiveness. This provides an easy-to-use water heater with excellent performance and controllability.

Embodiment An embodiment of the present invention will be explained based on FIGS. 1 and 2.

In FIG. 1, hot water produced by hot water supply heat [4!116] is supplied to hot water supply unit 8 through hot water supply pipe 17.

A water supply pipe 19 is also connected to the hot water supply unit 18, and the mixed hot water is supplied to a bathtub 22 through a faucet 21 through a mixing water pipe 20. Near the faucet 21, there is a temperature setting device for setting the temperature of the mixed hot water, the amount of mixed hot water, and the integrated value, and a hot water controller 23 that also serves as a setting device for the amount of hot water and the integrated value.
is provided. This hot water supply controller can be installed not only near the bath faucet but also in the kitchen, housekeeping room, etc. Signals are exchanged between the hot water supply controller 23 and the hot water supply unit 18 via the controller 24. The detailed structure of the hot water supply unit ratio is shown in FIG. The mixed hot water is supplied to the faucet from the outlet 29. The hot water side valve body 27 and the water side valve body 28 are regulated at both ends and biased by a spring in the direction of moving away from each other. It is driven by The mixed water temperature is detected by a flow rate detector 34. Further, 35 is a flow rate detector, which is provided between the flow rate detector 34 and the mixing valve 36 which is composed of a hot water side valve body 27, a water side valve body 28, a valve shaft 30, and the like.

The flow rate detector 35 includes a fixed blade wheel 37 that rotates the flow;
A ball 38 that rotates due to the swirling flow, a ball outflow prevention means 39, and a magnetic resistance element 40 that detects the rotation of the ball.
, and fixing means 41. The mixing of hot water and water whose ratio has been adjusted by the mixing valve 36 is promoted by the flow rate detector 35, thereby eliminating temperature fluctuations caused by insufficient mixing at the flow rate detector 34. Signals from the flow rate detector 35 and the flow rate detector 34 are transmitted to the controller 24. In addition, supply of mixed hot water
The control valve 42 that controls stoppage and the amount of hot water has a valve body 43 and a shaft 44.
, motor 45, gear box 46, etc.
It is also possible to serve as the mixing valve 36 structurally.

Next, the operation of this embodiment will be explained.

First, the normal mixing operation will be described. When the faucet 21 is open and hot water is being supplied, the controller 24 compares the temperature setting signal set by the hot water supply controller 23 and the mixed water temperature signal detected by the flow rate detector 34, and calculates the deviation between the two. The mixing valve 36 is driven by the motor 31 to the zero position.

Further, the set value of the amount of hot water and the signal from the flow rate detector 35 are compared, and the control valve 42 is controlled. When the faucet 21 is closed to stop the hot water supply, the flow rate detector 35 detects that the flow has stopped, and the drive of the motor 31 is stopped via the controller 24. For this reason, as in the past, the flow rate detector 34
Even if the temperature of the part falls due to cooling, the mixing valve 36 opens the hot water side and does not throttle the water side. When the faucet 21 is opened when refilling hot water, a flow occurs, which is detected by the flow rate detector 3.
5 is detected and the motor 31 is energized. When refilling hot water, hot water does not come out temporarily like in the past.

The mixing valve 36 also operates from its proper position. Thereafter, the flow rate detector 35, which performs normal mixing operations, is used not only as a means to detect the open/closed state of the faucet as described above, but also to change the proportional gain of the motor control according to the flow rate of the mixed hot water. is also used. If the flow rate decreases, reduce the gain,
If you increase it, you are increasing the gain. As a result, different optimal gains are used appropriately in each flow rate range, and good control is achieved with no oscillation even when the flow rate changes, little overshoot or undershoot, and short establishment time.

In this way, the motor 31 is controlled via the controller 24 by the temperature setting signal from the hot water supply controller 23, the signal from the flow rate detector 34, and the signal from the flow rate detector 35.

Next, we will discuss the quantitative water stop operation.

When the hot water supply controller 23 sets the integrated value of mixed hot water supply to the bathtub, sets the mixed hot water temperature, and opens the faucet 21,
The mixing valve 36 starts the mixing operation and the flow@detector 3
The flow rate detected at 5 begins to be integrated by the controller 24.

When the integrated flow rate of the mixed hot water reaches the set value, the control valve 42 is closed by a command from the controller 24, and the supply of the mixed hot water is stopped. Thereafter, after the user closes the faucet 21, the control mode returns to the initial state by resetting the hot water supply controller 23.

Note that it is also possible to perform normal opening and closing using the control valve 42 and to eliminate the faucet 21.

Furthermore, in the above embodiment, the motor 31 of the mixing valve 36 is stopped or started using the signal from the flow rate detector 35, but the hot water supply start/stop signal from the hot water supply controller 23 may also be used directly. .

Effects of the Invention As described above, the water heater of the present invention includes a mixing valve, a driving device for driving the mixing valve, a flow rate detector for detecting the mixed water temperature, and a temperature setting device for setting the mixed water temperature. , a flow rate detector that detects the amount of mixed hot water, a control valve that controls the flow rate of mixed hot water, a flow rate setting device that sets the flow rate of mixed hot water, and a drive device that operates based on the signals from the flow rate detector and temperature setting device. control,
It also controls the control n valve based on the signals from the flow rate detector and the flow rate setting device, adjusts the drive gain of the drive device based on the signal from the flow rate detector, and further stops driving the drive device when hot water supply is stopped. Since it is equipped with a controller, it has the following effects.

(1) When hot water supply stops, the controller prevents the driving device from driving the mixing valve, so hot water does not come out temporarily when hot water is resupplied, which is safer. Further, since the mixing valve can be operated from the position where it was used last time, it takes less time to reach the position where the predetermined temperature can be obtained, and responsiveness is improved.

(2) Since the gain of the drive device is adjusted based on the signal from the flow rate detector, control can be achieved with no oscillation in various flow rate ranges, little overshading and undershoot, and short settling time.

(3) In addition to flow rate control, the flow rate detector is used for drive gain jJ! It is used for the J section, and can also be used to stop the drive device when hot water supply is stopped, and one control can be used for multiple control objects.

[Brief explanation of the drawing]

Figure 1 is a diagram of a hot water supply system using a water heater according to an embodiment of the present invention, Part 2 is a partial sectional view of a hot water unit used in the same system, and Figure 3 is a sectional view of a conventional water heater. be. 23... Hot water controller (temperature setting device, flow rate setting 2i), 24... Controller, 31...
・Motor (drive device), 34...Flow rate detector,
35...Flow rate detector, 36...Mixing valve, 42...Control valve.

Claims (1)

[Claims] A mixing valve that mixes hot water and water to obtain mixed hot water, a driving device that drives the mixing valve, and a temperature detector that detects the temperature of the mixed water;
a temperature setting device for setting the temperature of mixed hot water, a flow rate detector for detecting the amount of mixed hot water, a control valve for controlling the flow rate of the mixed hot water, a flow rate setting device for setting the flow rate of the mixed hot water, the temperature sensor and the temperature. The drive device is controlled based on a signal from a setting device, the control valve is controlled based on signals from the flow rate detector and the flow rate setting device, and the drive device is controlled based on a signal from the flow rate sensor. A water heater comprising: a controller that adjusts a drive gain and further performs control to stop driving the drive device when hot water supply is stopped.