JPH0689904B2 - Hot water mixing controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention changes the mixing ratio of hot water and water by operating the hot water supply valve and the water supply valve in conjunction with each other, or separately, to obtain hot water having a desired temperature. According to the hot and cold water mixing control device, the opening and closing speeds of the valves (the opening change amount per unit time) based on the deviation between the set temperature and the hot water supply temperature.
The present invention relates to an improvement of a hot and cold water mixing control device capable of varying the temperature.

(Prior Art) Conventionally, this kind of hot and cold water mixing control device is based on a signal or value obtained by multiplying a temperature difference between a set temperature (desired hot water temperature) and an actual hot water supply temperature by a preset fixed gain. Thus, the valve opening / closing speed is controlled.

This fixed gain is selected so that the hot water supply temperature can reach the set temperature stably in a short time without causing hunting or the like. A large gain can be set as long as the pressure of incoming water supplied from a water supply pipe or the like, the temperature of incoming water, and the temperature of hot water supplied from a heat exchanger or the like are constant. However, in actuality, at least hunting occurs even in the worst condition within the fluctuation range that is allowed in advance in design for fluctuations in water supply pressure, such as fluctuations in water temperature in summer and winter, changes in heat quantity of heat exchangers, and variations in heat quantity. The above-mentioned fixed gain is set so as not to occur.

(Problems to be Solved by the Invention) Therefore, it cannot be said that the preset fixed gain is necessarily optimum under actual use conditions.

In addition, the gain could not be changed in response to fluctuations in the water temperature in summer and winter. Further, in the case of supplying hot water to the primary side of the hot water supply valve by using a gas water heater or the like, even if the amount of heat on the gas water heater side changes due to a change in the type of gas used, I couldn't change the gain.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a hot and cold water mixing control device capable of resetting the gain for determining the valve opening / closing speed by performing test water supply.

(Means for Solving the Problems) In order to solve the above problems, the hot and cold water mixing control device according to the present invention sets the opening degree of the hot and cold water mixing valve to a preset first and second position by operating a test switch. The test opening calculating means and the supply hot water temperature obtained in the mixed water pipe at the first and second openings are respectively detected, and the supply water temperature at the first opening and the supply water temperature at the second opening are detected. And a gain setting means for supplying to the valve speed control means a gain preset corresponding to the temperature difference based on the temperature difference output from the test temperature calculation means. It is characterized by that.

(Operation) When the test switch is operated, the test opening calculation means outputs the preset first opening command and then outputs the second opening command.

As a result, the hot and cold water mixing valve is controlled to the first opening state and then to the second opening state.

The test temperature calculation means calculates and outputs a temperature difference between the supply water temperature in the first opening state and the supply water temperature in the second opening state.

The gain setting means supplies the valve speed control means with a preset gain corresponding to the temperature difference based on the temperature difference output from the test temperature calculation means.

As a result, when the test switch is operated,
The gain is set according to the usage conditions.

For example, the valve opening on the water side is large and the valve opening on the hot water side is small (the mixing ratio of water is large) under the first opening condition, and the water side opening is small under the second opening condition. If the opening on the hot water side is large (the mixing ratio of hot water is high), if the temperature of the water supplied from the water pipe or the like is low or the water supply pressure on the water side is high, The temperature difference between the opening and the second opening becomes small. On the contrary, even if the water supply temperature or water supply pressure does not change,
For example, when the amount of heat of the gas water heater is increasing, the first
The temperature difference between the second opening and the second opening becomes large.

By thus obtaining the temperature difference between the two opening conditions, it is possible to comprehensively understand the conditions such as the temperature of the hot water side and the water side supplied (input) to the hot water mixing control device, the water supply pressure, and the like. .

Therefore, by resetting the gain that determines the valve opening / closing speed based on the temperature difference between the two types of opening conditions, the gain suitable for the hot water and water side (input) conditions at the time when the test switch is operated. Is set, the valve opening / closing speed can be controlled according to the actual use conditions, and hot water of a desired temperature can be stably supplied in a short time after the start of hot water discharge.

(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings.
In the drawings, the same reference numerals denote the same objects.

FIG. 1 is a system diagram showing a hot and cold water mixing control apparatus according to an embodiment of the present invention. According to the piping system of the figure, the hot water supply pipe 1a and the water supply pipe 2a for supplying hot water heated by a heat exchanger or the like.
And the supply amount is adjusted by valves 1 and 2, respectively. Each of the valves 1 and 2 constitutes a hot and cold water mixing valve 4 which is opened and closed by being interlocked by a driving means 3 such as a motor. Hot water and water are sent out to the mixed water pipe 5 through the hot and cold water mixing valve 4 at a predetermined mixing ratio, so that hot water of a desired temperature can be obtained from the calan 6. The mixed water pipe 5 is equipped with a temperature detecting means 7 such as a thermistor and monitors the supply temperature Tm with respect to the set temperature Ts. Further, the drive means 3 or the valve 1 or 2 is equipped with a valve opening degree detection means 8 such as a potentiometer.

The control system that controls such a piping system is the operation panel.
10, test opening command means 13, valve opening calculation means 14, temperature calculation means 15, gain memory 16, valve speed control means 1
7, a drive circuit 18 and a main control circuit 20 are provided. Less than,
These will be explained.

The operation panel 10 includes a test switch 11 and a temperature setting switch.
12. Equipped with various operation switches such as power switch. The test switch 11 is for presetting an appropriate gain for controlling the valve speed in the piping system by operating the switch. The temperature setting switch 12 is for setting a predetermined temperature to be obtained by the calan 6, for example.

Based on the operation of the test switch 11, the test opening commanding means 13 first commands to set the opening of the hot and cold water mixing valve 4 to θ = θ1 and then to θ = θ2. Here, it is desirable that the openings θ1 and θ2 correspond to the hot water side and the water side, respectively. The main control circuit 20 gives the timing for generating the opening instruction signals θ1 and θ2. The valve opening calculating means 14 normally calculates the valve opening required to achieve this set temperature based on the set temperature signal Ts from the temperature setting switch 12, and the hot and cold water mixing valve 4 has reached this opening. The drive circuit 18 is operated until the valve opening degree detection means 8 detects. Also,
When the test switch 11 is operated, based on the opening signals θ1 and θ2 supplied from the test opening commanding means 13, it is determined that the hot and cold water mixing valve 4 has achieved the openings θ1 and θ2. The drive circuit 18 is operated until each of them detects. In this way, the switching of the operation contents between the case where the test switch 11 is operated and the case where the test switch 11 is not operated is performed based on the command of the main control circuit 20.

The temperature calculation means 15 calculates the temperature difference ΔT based on the set temperature signal Ts supplied from the temperature setting switch 12 and the supply water temperature Tm detected by the temperature detection means 7 arranged in the mixed water pipe 5.
= Ts-Tm is calculated.

In the normal case, this temperature difference signal ΔT simply passes through the gain memory 16 and is input to the valve speed control means 17.

When the test switch 11 is operated, the temperature difference signal ΔT functions as an address signal for the gain memory 16, and the gain value stored in advance corresponding to each temperature difference is read from the gain memory 16 to control the valve speed. Is supplied to the means 17.

In this way, the switching of the control contents between when the test switch 11 is operated and when it is not operated is performed based on the command of the main control circuit 20.

The gain memory 16 stores a preset gain corresponding to the temperature difference signal ΔT of the supply water temperature in the first opening state and the second opening state obtained based on the operation of the test switch 11. And is configured by using, for example, a ROM or the like.

Therefore, by setting an appropriate gain in advance for each temperature difference ΔT and storing it in the gain memory 16, the gain suitable for the hot water and water side supply (input) conditions at the time when the test switch 11 is operated. Can be set.

The valve speed control means 17 specifies the opening / closing speed v of the hot and cold water mixing valve 4, and v = G (Ts based on the outputs ΔT = (Ts−Tm), G of the temperature calculation means 15 and the gain memory 16.
-Tm) is calculated and output. Where G is a gain value,
It is the value read from the gain memory 16 by operating the test switch 11.
The previous value is retained until operation 11 is performed. The main control circuit 20 executes such comprehensive control of the valve speed calculation means 17. The drive circuit 18 has such a valve speed control means.
The motor 3 of the hot and cold water mixing valve 4 is driven so as to open the hot and cold water mixing valve 4 at the speed v designated by 17 and to the opening θ designated by the valve opening calculation means 14.

Next, the operation of the embodiment of the present invention will be described with reference to the flow charts of FIG. 2 and FIG. In the following description, the numbers (30) to (50) correspond to the block numbers in the flowchart. Further, symbols such as (37y) and (37n) indicate that the judgment in the judgment block (37) is positive and negative, respectively.

When the system is started (30), the registers of the main control circuit 20 and the like receive the initial setting (31) and the temperature setting (32) by the temperature setting switch 12 of the operation panel 10. When the temperature is set by the temperature setting switch 12, the temperature calculation means 15 calculates the temperature difference ΔT, and the valve speed control means 17 sets the previous gain value G stored therein as a gain value (33). The velocity signal v is transmitted based on At this time, in order to monitor whether or not the test switch 11 is operated, the process proceeds to the optimum value control subroutine (40) for giving the optimum gain value to the system, but if the switch is not in the ON state (41n ) Immediately return to the main routine (50). Now, start hot water supply (3
4) The valve opening calculation means 14 and the temperature calculation means 15 execute temperature control and opening control so that the temperature Tm of the water supplied from the calan 6 becomes the set temperature Ts (35, 36). The temperature control (35) and the opening control (36) are continued (37) until the supply water temperature Tm detected by the temperature detecting means 7 matches the set temperature Ts. After this, unless the main switch (not shown) for stopping the operation of the entire control system is not turned off, the above control is executed along with the hot water supply (34) (38, 39).

When the test switch 11 is operated, the process shifts to the optimum value control routine (41) in the above process, and the test opening command means 13 outputs θ
An opening degree instruction signal is transmitted so that = θ1 (42). As a result, the opening calculation means 14 monitors whether the detection signal θm of the opening detection means 8 matches the output signal θ1 of the opening command means 13 (43). If they match (43y), the temperature T1 at that time is read by the temperature calculation means 15 via the temperature detection means 7 (44). Next, the test opening command means 13 sends an opening command signal so that θ = θ2 (45). As a result,
The opening calculation means 14 monitors whether the detection signal θm of the opening detection means 8 matches the output signal θ2 of the opening command means 13 (46). When they match (46y), the temperature T at that time
2 is read by the temperature calculation means 15 via the temperature detection means 7 (47). The temperature calculation means 15 uses the read temperatures T1, T2
The temperature difference ΔT = T1−T2 is calculated based on (48). The temperature calculation means 15 addresses the gain memory 16 using the temperature difference signal ΔT as an address signal, and the speed control means 17 sets the gain value G corresponding to the temperature difference among the gain values stored in advance as the optimum gain value G. (49). The valve speed control means 17 stores the value of this gain value G during the next operation of the test switch 11, and appropriately stores the speed signal v = G.
(Ts-Tm) is extended and output. After that, the process returns to the main routine (50), the temperature control (35) and the opening control (36) described above.
To execute.

Such operation of the test switch 11 may be performed when the conditions of the piping system change significantly, for example, when the system is installed, when the heat source is replaced, when the season changes, or when the piping is changed.

In the above embodiment, the valve opening calculation means 1
4. The temperature calculation means 15 and the valve speed control means 17 have both the valve opening calculation function, the temperature calculation function, and the valve speed control function associated with the test control, but they may be independent components. .

(Effects of the Invention) As described above, in the hot and cold water mixing apparatus according to the present invention, the opening degree of the hot and cold water mixing valve is set to 2 by operating the test switch.
The gain for determining the valve opening / closing speed is set again based on the difference in the supply temperature in each opening state, so that the hot water and water side at the time when the test switch is operated is changed. A gain suitable for the supply (input) condition is set, the valve opening / closing speed control can be performed in accordance with the actual use condition, and hot water of a desired temperature can be stably supplied in a short time after the start of hot water discharge.

[Brief description of drawings]

FIG. 1 is a system diagram of a hot and cold water mixing control apparatus according to an embodiment of the present invention, FIG. 2 is a flow chart for explaining the main operation of the apparatus of FIG. 1 according to the embodiment of the present invention, and FIG. 4 is a flowchart illustrating an operation for determining an optimum gain value in the device of FIG. 1 according to the embodiment of the invention. In the drawings, 1 is a hot water supply valve, 2 is a water supply valve, 3 is a driving means, 4 is a hot and cold water mixing valve, 5 is a mixed water pipe, 6 is a currant, 7 is a temperature detecting means, 8 is a valve opening detecting means, and 10
Is an operation panel, 11 is a test switch, 12 is a temperature setting switch, 13 is a test opening commanding means constituting a test opening calculating means, 14 is a valve opening calculating means including the test opening calculating means, and 15 is a test temperature. A temperature calculating means including a calculating means and a gain setting means, 16 a gain memory constituting the gain setting means, 17 a valve speed control means, 18 a drive circuit, 20
Is the main control circuit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shingo Tanaka 2-1-1 Nakajima, Kokurakita-ku, Kitakyushu, Fukuoka Prefecture Totoki Equipment Co., Ltd.

Claims (1)

[Claims] 1. A hot and cold water mixing valve in which a hot water supply valve for adjusting the amount of hot water from the hot water supply pipe and a water supply valve for adjusting the amount of water from the water supply pipe are continuously driven by a driving means to obtain hot and cold water having a desired temperature by a mixed water pipe. And a valve opening calculation means for calculating a valve opening of the hot and cold water mixing valve according to a set temperature, and a valve opening and closing speed of the hot and cold water mixing valve based on a difference between the set temperature and a supply temperature of the hot and cold water mixing valve. In a hot and cold water mixing control device including a valve speed control means, a test opening operation means for setting the opening degree of the hot and cold water mixing valve to a preset first and second position by operating a test switch; And the temperature of the supply water temperature at the first opening and the temperature of the supply water temperature at the second opening, respectively. A test temperature calculating means for calculating a difference and a gain setting means for supplying a preset gain corresponding to the temperature difference based on the temperature difference output from the test temperature calculating means to the valve speed control means are provided. A hot and cold water mixing control device.