JPS5997452A - Water heating control device - Google Patents

Abstract

PURPOSE:To reduce the error in setting the quantity of water, to make the titled device small-sized and to reduce the capacity of the device by a method wherein the number of parts for constituting a water quantity controller is made small. CONSTITUTION:When water is in a standing condition, the gear-like center section 6 of a water heating control device is enclosed by an elastic O-ring 5 leaving a predetermined space from the O-ring. Further, when the water begins to flow, the O-ring 5 is pressed against a pedestral surface 7a of a housing due to the difference in pressure between a valve inlet port chamber 3 and a valve chamber 4 so that the O-ring contracts to shift from a position A to a position B and comes near the top of a large projection 6a and that of a small projection 6b of the gear-like central section 6. In this case, the sectional area E of the flowing water reduces as the abovementioned pressure difference increases. In addition, the sectional area E is so adjusted that the flow rate of the water becomes constant throughout the pressure range by selecting the height and width of each of the projections 6a and 6b and the O-ring 5 and it is possible to obtain a desired quantity of water by moving an adjust shaft 15.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to temperature control of hot water supply in instantaneous water heaters and the like, and the temperature control is performed by automatically controlling the amount of hot water supplied.

Conventional configuration and its problems It is a well-known technology that a water heater detects the hot water temperature and controls the heating and input so that the hot water temperature is equal to the set temperature. There was a problem that if an excessive amount of water was supplied, the temperature of the hot water would drop. As a solution to this problem, a configuration has also been proposed in which the setting of a water flow control device is changed in conjunction with a temperature setting device to prevent a temperature drop due to excessive flow of water. □However, there are many components for setting the water volume, and the set water volume varies depending on the machining precision of each part, and the water volume control device and drive device become large, and the mechanical play of the drive device makes it impossible to control the water volume with high precision. There were drawbacks.

Purpose of the Invention The present invention eliminates such drawbacks, and its first purpose is to reduce errors in setting the water amount by reducing the number of components of the water amount controller, and to reduce the size and capacity of the water amount controller. The second purpose is to correct hysteresis caused by mechanical play in the drive unit and the connection between the drive unit and the water flow controller.
The purpose is to perform more advanced water flow control.

Structure of the Invention The present invention detects the outlet temperature of a heat exchanger heated by a heating device with a temperature detector, calculates a signal from an outlet temperature setting section and an outlet temperature signal in a heating control section, and also calculates the output temperature signal of an outlet hot water temperature setting section. The water flow rate calculation unit calculates the signal and controls the drive device of the water flow controller.The drive direction detection unit detects the drive direction of the drive device by the water flow rate calculation unit, and controls the drive device when the drive direction is reversed. By correcting the water volume setting section, hysteresis due to play or stiffness of the drive device or the connection between the drive device and the water flow controller is prevented from occurring, and the water volume is controlled to the optimum level.

Description of examples Examples thereof will be described below with reference to the accompanying drawings.

In FIG. 1, 1 is a water flow controller, and water enters a valve inlet chamber 3 from an inflow path 2. It flows into the valve chamber 4 through the gap between the gear-shaped center part θ and the nozzle 7, passes through the heat exchanger 11, and is supplied to the outside through the outlet pipe 12.

The operation of the water flow controller at this time will be explained with reference to FIGS. 3 and 4. When the water is at rest, the gear-shaped center part 6 is located in the housing 71 by the adjusting shaft 13 and is surrounded by the elastic Φ ring 5 with a certain spacing. When the water starts flowing out, the elastic Φ ring 5 is caused by the pressure difference between the valve inlet chamber 3 and the valve chamber 4 (
Pl-P2), it is pressed against the housing pedestal surface 7a, contracts and moves inward. As the pressure difference increases, the elastic Φ ring 5 moves from position A to position B, approaching near the tops of the large protrusion 6a and the small protrusion 6b of the gear-shaped central portion 60. As the pressure difference further increases, the elastic ring 5 is pressed between each protrusion (position C).
), the flowing water cross section E is continuously and quantitatively contracted <(E1
~E2~E3).

Here, the water flow cross section E is adjusted for each pressure difference by carefully selecting the height and width of each protrusion and the elastic Φ ring 5 so that the flow rate is constant over the entire pressure range. Therefore, by continuously changing the height and width of each protrusion of the gear-shaped central portion 6 in the axial direction of the adjustment shaft 13, the amount of water can be obtained as desired by moving the adjustment shaft 13.

In the block diagram of FIG. 2, the hot water supply controller 22 includes a hot water outlet temperature setting section 23, a heating i1J control section 24, and a water amount calculation section 26.
・Timer device 27 ・Drive direction detection section 2 days ・Water amount setting section 29
It is composed of a water amount control section 22 consisting of a water amount calculation section 26 and a water amount calculation section 26.
includes a water amount initial calculation section 26a and a water amount recalculation section 26b. To control the hot water temperature, the respective signals from the hot water temperature setting section 23 and the hot water temperature detector 21, which are composed of variable resistors, are calculated by the heating control section 24, and the heating controller 18 is driven by known PID control to control the heating. By adjusting the calorific value of the device 19, the temperature of hot water discharged from the heat exchanger 11 is kept constant.

For water flow control, signals from the outlet hot water temperature setting section 23 and the incoming water temperature detector 2o are calculated by the water amount initial calculation section 26a, and the water amount is set by the water amount setting section 29 via the drive direction detection section 28, and then sent to the drive device 14. Sends a drive signal. The capacity of the heating device 19 (including the capacity of the heat exchanger 11) is set in the water quantity initial calculation section 26a, and the drive unit 14 slides the adjustment shaft 13 of the water quantity controller 1 via the adjustment cam 17. The amount of water is controlled by changing the position of the gear-shaped center fixed to the adjustment shaft 13. There is another control mode for water flow control: hot water temperature.

The signals from the setting unit 23 and the hot water temperature detector 21 are transmitted to the timer 27.
The water amount is set by the water amount setting section 29 via the drive direction detection section 28 from the water amount recalculation section 26b, which calculates the water amount via the water amount recalculation section 26b, and the drive device 14 is driven. The driving direction detecting section 28 detects the set value in the signal only when the driving direction according to the signal calculated by the water amount initial calculating section 26a or the water amount recalculating section 26b is different from the driving direction of the driving device 14 that was driven immediately before. A signal is added and sent to the water amount setting section 29. The magnitude of the added signal is set in consideration of the magnitude of the gap (play gap) of the gear 16, the magnitude of mechanical play occurring at the connection between the gear 16 and the adjustment cam 17, and the like.

Next, the operation will be explained. When the power is turned on, signals from the outlet water temperature setting section 23 and the incoming water temperature detector 2o are taken in, and calculations are performed in the water amount initial calculation section 26a. In the water amount initial calculation section 2'6a, the heating capacity of the heating device 19 is preset. For example, when a microprocessor is used for control, it is programmed in advance and written into the memory element. The water amount initial calculation section 26a sends a drive signal proportional to the temperature difference between the hot water outlet temperature and the inlet water temperature from a certain reference point to the water amount setting section 29 via the drive direction detection section 28 to drive the drive device 14. , adjustment cam 17
rotates and slides the adjustment shaft 13 to initialize the water amount. Figure 6 shows the water volume setting value relative to the output of the motor 15 of the drive device 14. The water volume is inversely proportional to the motor output, and lines I and J indicate the cases when the motor output is increased and decreased, respectively. The mechanical play mentioned above causes hysteresis. The amount of water is set by determining the position of the gear-shaped central portion 6 of the water amount controller 1, and then when the user starts water flow, the heating device 19 starts combustion and after a slight delay, the hot water temperature rises. . The deviation of the hot water temperature with respect to the hot water temperature setting is calculated by the water amount recalculation section 26b using the signals from the hot water temperature setting section 23 and the hot water moxibustion detector 21 via the timer 27. The timer 27 is used to set the length of the heating time delay between the heating device 19 and the heat exchanger 11. The water amount recalculation section 26b drives the drive device 14 via the drive direction detection section 28 and the water amount setting section 29 if the temperature difference between the set hot water tap temperature and the actual hot water tap temperature is above a certain set range.

The driving direction detecting section 28 stores the driving direction in which the driving device 14 was driven immediately before, and if the signal calculated by the water amount recalculating section 26b is the same driving direction, the signal is sent to the water amount setting section 29. However, in the case of a different driving method, a signal for hysteresis is added to the signal and sent to the water amount setting section 29. The signal from the water amount setting section 29 drives the drive device 14, and the water amount is controlled by the water amount controller 1. In this way, the amount of water is controlled until the hot water temperature and the set hot water temperature become equal.

If the amount of water is limited by the user, it is necessary to adjust the capacity of the heating device 19 in order to control the temperature of the hot water. In this case, the heating control section 24 calculates the deviation between the respective signals of the hot water temperature setting section 23 and the hot water temperature detector 21, and the heating controller 18 adjusts the heating amount to control the hot water temperature to be equal to the set temperature. Ru.

If the user changes the hot water temperature setting beyond a certain limit, the water flow control is reset, and the signals from the inlet water temperature detector 20 and the hot water temperature setting section 23 are calculated by the water flow initial calculation section 26a, and the driving direction is The detection unit 28 outputs an additional signal based on the driving direction, and if the driving direction of the drive device based on the signal from the water volume calculation unit that calculates the incoming water temperature signal or the exiting water temperature signal is different from the driving direction that was driven immediately before, the water volume calculation unit Since the drive device is driven by adding a certain set signal to the signal, it is possible to prevent hysteresis caused by mechanical fluctuation of the drive device and to perform fine adjustment of water flow rate control. Since hysteresis can be eliminated and the water flow controller has fewer components, the tolerance for processing accuracy is increased, making processing and assembly easier, increasing the reliability of the drive device, and downsizing the water flow controller.

Since the capacity can be small and the diameter of the adjustment shaft can be made small, the driving force is small and the drive device can be made smaller and smaller in capacity.

In addition, as mentioned above, the water volume setting can be arbitrarily selected by the setting of the elastic Φ ring of the gear-shaped hand core and the cam shape of the adjustment cam, for example, by the heating capacity written in the memory element of the microprocessor. There is also the advantage that the same microprocessor can be used for water heaters having different heating inputs depending on the selection of the gear-shaped center part, the elastic Φ ring, and the adjustment cam even if the number of heating inputs is constant.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of a hot water heating controller showing an embodiment of the present invention, Fig. 2 is a block diagram of the same control, Fig. 3 is a partial detailed sectional view of a water restrictor, and Fig. 4 is a diagram of the same. FIG. 6 is a graph showing the water pressure-water amount characteristics of the water amount controller, and FIG. 6 is a graph showing the characteristics of the water amount controller. 1...Water flow controller, 8...Support plate, 9
... Spring holder, 10 ... Return spring, 11 ... Heat exchanger, 14 ...
Drive device, 18... Heating controller, 19...
... Heating device, 20 ... Inlet water temperature detector, 21
... Hot water temperature detector, 22 ... Hot water supply controller, 23 ... Hot water temperature setting section, 25 ...
...Water amount control section, 26...Water amount calculation section, 26a
...Water amount initial calculation section, 26b... Water amount recalculation section, 27... Timing device, 28...
- Driving direction detection section, 29...Water amount setting section.

Claims (1)

[Claims] (1) A water flow controller in which an elastic Φ ring is close to or in close contact with the gear-shaped center due to the pressure difference caused by the flow of fluid, a driving device for the water flow controller, and a heat exchanger connected to the water flow controller. , a heating device of the heat exchanger, a heating controller of the heating device, an outlet hot water temperature detector provided on the inlet/outlet side of the heat exchanger, an inlet water temperature detector, an outlet hot water temperature setting unit, and the heating controller. It has a hot water supply controller consisting of a heating control section and a water flow rate control section, and the water flow rate controller controls the hot water temperature setting (
The water flow control section operates a water flow initial calculation section that calculates a signal from the outlet hot water temperature setting section and a signal from the incoming water temperature detector, a signal from the outlet hot water temperature setting section, and a signal from the outlet hot water temperature detector through a timer. □Claim M1 consisting of a water amount recalculation unit to calculate
Hot water heating control bag as described in section. Place. (Mari) When the drive direction of the drive device is reversed, the correction is made by adding a certain control amount.
Hot water heating control device as described in section.