JPS62123510A - Hot and cold water mixing valve device - Google Patents

Abstract

PURPOSE:To minimize both the overshoot and undershoot and to prevent previously the hunting phenomenon by preparing at least two types of characteristic curves of a control means and changing the working speed of a valve to a high level from a low level with a specific difference of temperatures. CONSTITUTION:An arithmetic and control means 10 contains a valve switching speed control unit for control of the tepid water temperature as well as a flow rate control unit. The valve switching speed control unit includes a switching command means 24 to transmit the temperature difference signal DELTAT as it is and also monitors whether the temperature difference DELTAT exceeds the set value (a) of switching temperature or not. Then the switch signal SW is transmitted when DELTAT>a is satisfied. The data corresponding to the low-speed characteristic curve having a small changing factor is read out of a ROM 28 for execution of the corresponding control before the signal SW is produced. Then a high-speed characteristic curve having a large changing factor is produced after generation of the signal SW. Then the corresponding data is read out of the ROM 28 for execution of the corresponding control.

Description

Detailed Description of the Invention (Industrial Applicability rr) In the present invention, hot water at a predetermined temperature and wood are mixed through an interlocking valve, and the mixing ratio is controlled using a control means.
Supply hot water at a predetermined temperature to Karan and darkness! ), and particularly relates to improvements in the control means.

(Prior art) A hot water supply valve that controls the amount of hot water passing through at a predetermined temperature and a water supply valve that works in conjunction with this hot water valve to control the amount of water that passes through the wood are provided, and the hot water and water passing through each valve are mixed in a mixing water pipe. However, various devices are known that supply hot water at a predetermined temperature to the boiler by controlling the mixing ratio.

In this case, if there is a large difference between the set temperature and the temperature of 7μ supplied to the callan (hereinafter referred to as "actual temperature"), the opening/closing speed of the above-mentioned valve is increased in order to reach the set temperature faster. Such a situation is noticeable in the so-called cold start u+ when hot water is first tried to be dispensed from the pot.

A conventional valve opening/closing speed control unit for controlling this type of control is shown in FIG. 7, for example. That is, the unit includes a hot water temperature detecting means (71) for detecting the actual temperature (T^) in the mixing water pipe, a hot water temperature setting means (72) for setting a desired hot water temperature (TO), and a hot water temperature detecting means. (7
1) Detected actual temperature (〒8) and hot water temperature setting means (72)
Comparison means (73) for calculating the difference (Δ↑) from the set temperature (To) of It is provided with a memory control means (74) for generating the address of , and the above-mentioned ROM (75).

ROM (75) is 1, for example, 41 related to the opening/closing speed (R) of the valve determined according to the temperature difference (6) between the actual temperature (T^) and the set temperature (TO) as shown in Fig. 8.
The F characteristic curve (80) is memorized. That is, the control means controls the temperature difference (6) between the set temperature (TO) and the actual temperature (T^).
The opening/closing speed (R) of the valve is sequentially read out from the memory (75) in accordance with the current speed (R) and controlled as shown in the characteristic curve (80) in FIG. In this case, there is a temperature difference (6 teeth) (t/
1(a), the valve actuation speed (R) is 1
- It responds at the limit speed (R\1), and when the temperature difference (ΔT) becomes smaller than this value (a), the valve operating speed (R) also gradually becomes smaller.

(Problem to be solved by the invention) Control-L having a characteristic curve (80) as shown in FIG.
According to Dan, if the limit speed (R~()) is set to a corresponding value, the response will be blunted when the temperature difference ΔT=a or less2. Also, if the limit speed (Ry) is set to be sufficiently high, then The response is quick when the temperature difference is below (a), but it causes overshoot and undershoot below the set temperature, and hunting that is associated with these fluctuations is likely to occur.This hunting In order to prevent this, hunting detection means (76) is provided in the configuration shown in Fig. 7, and two types of characteristic curves (90) and (91) as shown in Fig. 9 are stored in the ROM (75). It has been proposed to store a ROM (75
) is changed from curve (90) to curve (91). However, this control is a response after hunting occurs, and minimizes overshoot and undershoot, or prevents hunting from occurring.
It wasn't something to do.

Therefore, the present invention was made in an attempt to eliminate the above-mentioned drawbacks of the prior art, and an object of the present invention is to provide a hot water mixing valve device that can minimize overshoot and undershoot, or prevent hunting. Do one.

(Means and operations for solving the problem) In order to achieve this object, according to the present invention, at least two types of characteristic curves of the control means are provided, and the operating speed of the valve is suddenly changed from the linear speed at a specific temperature difference. Make the transition to speed. With this configuration, the set temperature can be approached quickly using the rapidity characteristic, and if there is a possibility of overshoot or undershoot, these can be suppressed using the linear velocity characteristic. can.

For example, according to the hot water mixing valve device according to the embodiment of the present invention, the hot water supply valve (3
), a water supply valve (4) that operates in conjunction with the hot water supply valve (3) to control the passage of water, and a predetermined amount of hot water passing through the hot water supply valve (3) and the water supply valve (4). A mixing water pipe (
5), and the water temperature and flowing clay in this mixing water pipe (5).
Temperature detection means (8) for detecting temperature and temperature detection means (7) for detecting temperature
The hot water supply valve (3) and the water supply valve ( 4) a control means having a valve opening/closing speed control unit that determines the opening/closing speed of the control means, the valve opening/closing control unit of the control means having at least two characteristic curves (A) and (B), and the temperature difference (6) exceeds a specific switching temperature (a,), the hot water supply valve (3)
Also, one characteristic aspect that determines the opening/closing speed (R) of the water supply valve (4) in No. 111! a (B) to the other characteristic curve (
Control is performed to move to A).

Further, according to the hot water mixing valve device according to the embodiment of the present invention, the valve opening/closing speed control unit of the control means is activated at the time of a cold start immediately after the start of use.

Furthermore, according to the hot water mixing valve device according to the embodiment of the present invention, the valve opening/closing speed control unit/
The one characteristic curve of the vehicle is a linear velocity curve (B), and the other characteristic curve is a rapidity curve (A).

(Example) The present invention will now be described in detail with reference to the accompanying drawings. Note that the same reference numerals in each figure indicate similar objects.

FIG. 1 shows the overall configuration of a hot water mixing valve device according to an embodiment of the present invention, in which (1) is a hot water pipe for supplying hot water at a predetermined temperature, and (2) is for supplying water. Water supply pipe, (3) is hot water supply tr? (1) is a hot water supply valve that controls the passage of hot water supplied by the hot water supply valve (4), which is interlocked with this hot water supply valve (3) and controls the passage of water supplied by the water supply pipe (2); 5) is a mixing water pipe (6) which mixes a predetermined amount of hot water passing through the hot water supply valve (3) and a predetermined amount of water passing through the water supply valve (4) and leads it to the water supply valve (6);
) is the tap that delivers hot water at the desired temperature, (7) is the mixing water pipe (5
), a flow rate sensor that measures the amount of mixed water flowing through (8)
(9) is a temperature sensor such as a thermostat that measures the temperature of the mixing water pipe flowing through the mixing water pipe (5), and (9) is an operation setting means that turns the device on and off and sets the temperature and amount of hot water desired to be supplied. , (10) are two valves (3), (4) based on the settings of the operation setting means (9).
Arithmetic control means (11) forms an opening/closing operation command signal (CC) for opening/closing operation, and (11) is a drive circuit or drive that drives the valves (3) and (4) by the command signal (CG) of the arithmetic control means (10). The driving means includes a motor for

That is, according to this embodiment, the calculation control means (
10) forms a command signal (CC) so that hot water of a set amount and temperature is obtained in the cooker (6), and operates the valves (3) and (4) via the driving means (11). Therefore, the arithmetic control means (lO) includes Ii, a quantity control unit, and a valve opening/closing speed control unit that controls the opening/closing speed of the valve in order to control the hot water temperature. The present invention relates to the latter, and the valve opening/closing speed control unit according to the embodiment of the present invention is, for example, as shown in FIG. Hot water temperature detection means (22) forms an electric signal corresponding to the desired hot water temperature (TA); The immersion means (23) is the hot water temperature detection means (21)
and each output signal (TA) of the water temperature setting p stage (22),
(To) is calculated by calculating the difference between the actual temperature (TA) and the set temperature (
(24) is a comparison means for forming an electrical signal corresponding to the temperature difference (6 digits) from 1. (25) is a switching temperature setting means for setting the switching temperature (a) of the switching command means (24); (27) is a switching command means for forming a switching signal (SW) for switching the contents of the memory, which will be described later. signal(
Memory (ROM) (2B
) for determining the content to be read from the memory control means and generating a predetermined address; and (28) for driving the valves (3) and (4), the rapidity characteristic curve (A) and linear velocity shown in FIG. This is a memory that stores the characteristic curve (B).

Important components among the components listed below will be explained in more detail. !
, 7] The switching command means (24) passes the temperature difference signal (ΔT) as it is, but also monitors whether the temperature difference (ΔT) exceeds the switching temperature set value (a), and
If it is Tea, a switching signal (S-) is sent out.

Before this switching signal (SW) is generated, the data corresponding to the linear velocity characteristic curve (B) with a small rate of change in Fig. 3 is
M (28) and executes the corresponding control. After the switching signal (SW) is generated, the control is switched to the rapidity characteristic curve (A) with a large rate of change in FIG. 3, the corresponding data is read from the ROM (28), and the control is executed. In this case, the order of addresses commanded by the memory control means (27) is fixed, and the curves (A) and (B) in FIG.
The order is in the direction of the arrow 7 and the corresponding numbers (1) to (8). Note that when the temperature difference (ΔT) is between ±0.5°C with respect to the set temperature (To), it is considered to be within the permissible range and the signal (CC) for driving the valve is not formed. is a dead zone. Furthermore, the switching temperature (a) of the temperature difference (6 teeth) is, for example, ±3°C.

Next, the operation of the above embodiment will be explained. However, in the following explanation, it is assumed that the transition temperature difference (a) of the characteristic curve is 3°C.

In use, the set temperature (To) is set to 43℃, and the actual temperature (TA) at the initial cold start of hot water supply is 2.
Assume that the temperature is 0°C. In this way, at the time of cold start, the difference temperature (ΔT) between the set temperature (TO) and the actual temperature (TA)
)(=23℃) is large, and when ΔT>3℃, the switching temperature a(=
3°C), the memory control means (27) controls the readout from the memory (28) to the part (1) of the characteristic curve in FIG.
”(2) = valve actuation speed (R) along o(3)
Speed up the process and increase the amount of hot water. During this time, the actual temperature (TA) rises towards the set temperature (To), so
In order to quickly respond to this and reduce the overshoot, the valve operating speed is reduced along part (4) of characteristic curve (A). As a result, the actual temperature (TA) changes from the set temperature (TO
), the third quadrant characteristic curve (
Control is executed according to parts (5) - (13) = I (7) instant (8) of A) and (B). The above-described control can be simplified as shown in the flowchart of FIG. 4.

Figure 5 shows the change in the actual temperature (TA) with respect to time (1) due to the control described above, and shows the change in the actual temperature (TA) with respect to time (1).
) corresponds to the control characteristic curve (A) below.

(B) shows the difference. In other words, immediately after the start,
The valve operation shifts from the linear velocity characteristic curve (B) to the rapidity characteristic curve (A), the hot water supply valve (3) rapidly opens and the water supply valve (4) closes, and the actual temperature (TA) rapidly rises. Therefore, a slight overshoot occurs, but as the temperature rises, the control means (11) is controlled by the rapidity characteristic curve (A
), and turn the hot water supply valve (3).
) closes rapidly. At this stage, if the actual temperature (TA) falls below the set temperature (To), the control starts with the linear velocity characteristic curve (B
) to avoid increasing undershoot. When moving from undershoot to the set temperature (To), the curve part (
8)) Accordingly, the actual temperature (TA) becomes the set temperature (〒
0), it shifts to the linear velocity characteristic curve (B) (curve part (1)), and as the same control is repeated, the actual temperature (
TA) approaches the set temperature (To), and when the actual temperature (TA) reaches the set temperature (To) ±0.5°C, control is stopped.

The present invention is not limited to the above embodiments and modifications, and various other embodiments and modifications are possible within the technical scope of the present invention, and equivalent components can be replaced. It is clear to the person skilled in the art that it is possible to have two characteristic surfaces with different slopes! a(A).

(B) was used, but as shown in FIG. 6, characteristic curves (C) and (D) that are parallel to each other may also be used.

(Effects of the Invention) According to the present invention, as described above, the valve speed control unit ( ) of the control means is provided with two types of characteristic curves of linear velocity and rapidity, and when the actual temperature exceeds the set temperature, By controlling the linear velocity and shifting to rapid control when the temperature difference exceeds a certain switching temperature, overshoot and undershoot can be minimized and hunting can be prevented. A hot water mixing valve device can be obtained.

[Brief explanation of drawings]

FIG. 1 is an overall system diagram of an embodiment of the present invention, FIG. 2 is a main system diagram of an embodiment of this invention, FIG. 3 is a memory configuration diagram of an embodiment of the invention, and FIG. Flowchart for explaining the operation of the embodiment. FIG. 5 is a characteristic diagram for explaining the operation of the embodiment of the present invention, FIG. 6 is a memory configuration diagram of another embodiment of the present invention, and FIG.
9 to 9 are explanatory diagrams of the conventional device. In the drawings, (3) is a hot water supply valve, (4) is a water supply valve, (5) is a mixing water pipe, (8) is a collar, (7) is a flowing seam detection means, (8) is a temperature detection means, ( 9) is an operation setting means, and (10) is an arithmetic control means.

Claims (3)

[Claims] (1) A driving means for driving a hot water supply valve that controls the amount of hot water at a predetermined temperature passing through the water supply valve and a water supply valve that controls the amount of water that passes through the water supply valve on one shaft or on two shafts in conjunction with each other, and the hot water supply valve A mixing water pipe that mixes a predetermined amount of hot water passing through the water supply valve with a predetermined amount of water that passes through the water supply valve and leads the mixture to the water supply valve, and a temperature detection means and a flow rate detection means that respectively detect the temperature and flow rate of the hot water in the mixing water pipe. and a control means having a valve opening/closing speed control unit that determines the opening/closing speed of the hot water supply valve and the water supply valve according to a certain characteristic curve based on the temperature difference between the temperature detected by the temperature detection means and a desired set temperature. In the hot water mixing valve device, the valve opening/closing control unit of the control means has at least two characteristic curves, and controls the opening/closing speed of the hot water valve and the water supply valve when the temperature difference exceeds a specific switching temperature. A hot water mixing valve device characterized in that control is performed to shift from one determined characteristic curve to another characteristic curve. (2) The hot water mixing valve device according to claim 1, wherein the valve opening/closing speed control unit of the control means is configured to operate at a cold start immediately after the start of use. (3) In the device according to claim 2, the one characteristic curve of the valve opening/closing speed control unit of the control means is a linear velocity curve, and the other characteristic curve is a rapidity curve. A hot water mixing valve device characterized by: