JPH04243401A - Water/hot water mixing controller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water mixing control device which adjusts the mixing ratio of hot water and water to obtain an optimum mixed water temperature.

0002

2. Description of the Related Art Conventionally, there has been a hot water mixing device of this type as shown in FIG.
Publication No.). In FIG. 7, 1 is a hot water flow path, 2 is a water flow path, and an automatic pressure regulating valve 3 is provided in relation to each flow path. The automatic pressure regulating valve 3 includes a hot water side valve body 4 that reduces the primary pressure PH1 of the hot water flow path 1, a hot water side valve seat 5, and a primary pressure PC1 of the water flow path 2.
The water-side valve body 6 and the water-side valve seat 7 that reduce the pressure of It consists of a piston 9 that operates differentially. Even if the pressure of hot water or water suddenly changes, the automatic pressure regulating valve 3 moves with that pressure, and the secondary pressure PH2 of hot water and water changes.
and PC2 are always kept equal.

Further, a biasing means 10 is provided on the valve shaft 8, and the biasing means 10 is connected to the end of the valve shaft 8, and sandwiches a bobbin 11, a coil 12 wound on the bobbin 11, and an insulated coil 12. The coil 12 is connected to a control means 18 via a flexible part 14.

When a current is passed through the coil 12 from the control means 18, the current crosses the magnetic field generated by the permanent magnet 13, so that a bias force is applied to the valve stem 8 according to Fleming's law. For this reason, the automatic pressure adjustment point shifts by the amount of the bias force, and for example, the pressure is always adjusted at a point where the secondary pressures PH2 and PC2 of hot water and water are 2:1, resulting in a higher hot water temperature. . By changing the current to the coil 12 in this way, the mixed water temperature is changed. Reference numeral 19 denotes a mixing section for hot water and water. After mixing, the hot water is discharged via a flow rate regulating on-off valve 20. The temperature of the hot water is determined by a mixed hot water temperature detection means (for example, a thermistor) 15, and the flow rate is determined by a flow rate detection means 16. The control means 18 energizes the bias means 10 and the flow regulating valve drive means 21 to adjust the temperature so as to match the value of the setting means 17.

[0005]

[Problems to be Solved by the Invention] However, in the above configuration, when the mixing water temperature is changed by the setting means 17, the control of the mixing valve (automatic pressure regulating valve 3) and the control of the flow rate regulating on-off valve 20 are performed at the same sampling rate. If sampling time is used, transient fluctuations may occur in the temperature of the mixed water; if sampling time is slow enough to avoid transient fluctuations, it takes time to change the temperature, which is inconvenient.

On the other hand, if the sampling time is made faster, the mixed hot water temperature detecting means 15 detects the unevenness of mixing in the mixing section 19, making the control unstable and causing hunting.

[0007] The present invention has been made to solve such conventional problems, and an object of the present invention is to shorten the sampling time of the mixing valve control when changing the temperature, thereby reducing transient fluctuations and quickly reaching the changed temperature.

[0008]

[Means for Solving the Problems] In order to solve the above problems, the hot water mixing control device of the present invention includes: a hot water flow path, a water flow path, a mixing valve that adjusts the flow rates of the hot water flow path and the water flow path; A mixing valve driving means for driving the mixing valve, a mixing water temperature detecting means for detecting the mixed water temperature, a setting means for setting the mixing water temperature, and a control means for controlling the driving amount of the mixing valve driving means. The control means includes a mixing valve control means that determines the driving amount of the mixing valve driving means based on a signal from the mixed hot water temperature detection means and a signal from the setting means, and a means for detecting transient fluctuations or a means for causing transient fluctuations. The apparatus includes a sampling time setting means for changing the sampling time of the mixing valve control means using a signal.

[0009]

[Operation] With the above-described structure, the present invention changes the sampling time of the mixing valve control during transient fluctuations.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Note that FIG. 1 is a sectional view of the hot water mixing control device, and the same parts as in FIG. 7 of the conventional example are given the same reference numerals and detailed explanations are omitted. Reference numeral 22 denotes an urging means, and the automatic pressure regulating valve 3 and the urging means 22 form a mixing valve 23. A mixing valve driving means 24 applies a variable bias force to the mixing valve 23 in opposition to the force of the urging means 22. The mixing valve driving means 24 has a plunger 25 made of a magnetic material, and a waterproof and insulated coil 26 surrounding the plunger 25, and the coil 26 is connected to the control means 18. The mixed water temperature is detected by a mixed water temperature detection means 15. The flow rate is detected by flow rate detection means 16.

FIG. 2 shows an example of the control means 18. 27 is a mixing valve control means which inputs the signals of the mixing water temperature detection means 15 and the setting means 17 and calculates the drive amount of the mixing valve 23; 28 is a mixing valve driving means (coil) based on the signal of the mixing valve control means 27; This is a first drive amount setting means for setting 26 drive amounts. Reference numeral 29 denotes a flow rate adjustment on-off valve control means which inputs the signals from the flow rate detection means 16 and the setting means 15 and calculates the drive amount of the flow rate adjustment on-off valve 20; This is second drive amount setting means for setting the drive amount of the on-off valve drive means 21. Reference numeral 31 denotes a sampling time setting means for changing the sampling time of the mixing valve control means 27 based on a signal from the setting means 17.

Next, the operation of the configuration of the present invention will be explained. When a current is applied to the coil 26 from the control means 18, the plunger 25 made of a magnetic material applies a bias force to the valve shaft 8 according to Fleming's law. The automatic pressure regulating valve 3 is balanced when this bias force and the urging force of the urging means 22 are balanced. Therefore, by changing the current flowing through the coil 26, the balance point of the automatic pressure regulating valve 3 can be moved. For example, when the current is small, the force of the biasing means 22 is stronger, so the water side valve body 6 opens more than the hot water side valve body 4, and the hot water outlet temperature becomes lower. When the current is increased, the biasing means 2
By pushing out the plunger 25 against the force of 2, the hot water side valve body 4 begins to open, and as a result, the temperature of the hot water becomes higher.

In this manner, the control means 18 inputs the signal from the mixed hot water temperature detection means 15 and the signal from the setting means 17, thereby varying the current flowing through the coil 26 so that the hot water temperature reaches the set temperature, and controls the mixing valve. Adjust 23. Normally, the mixing valve control means 27 and the flow rate adjustment on/off valve control means 29 operate at the same sampling time (for example, t1 in FIG. 3).

[0014] When the set temperature is changed or the pressure suddenly changes due to disturbance, etc., the amount of drive of the mixing valve 23 must be changed. At this time, as shown in t1 in FIG. 3, the mixing valve 23
If this control is performed, the amount of transient fluctuation in the mixed water temperature will increase, which is dangerous.

Means for preventing the above phenomenon will be explained below. First, the case where the set temperature of the mixed water temperature is changed by the setting means 17 will be explained. In FIG. 4, when the set temperature is changed by the setting means 17 at time a, the sampling time setting means 31 advances the sampling time of the mixing valve control means 27 from the normal sampling time t1 to t2. Then, the coil current is adjusted via the first drive amount setting means 28 so that the set temperature is quickly reached. When the difference between the set temperature and the signal from the mixed hot water temperature detection means 15 falls within a predetermined constant value (point b), the mixing valve control means 27 outputs a signal to the sampling time setting means 31. Upon receiving this signal, the sampling time setting means 31 returns the sampling time to the normal value t1.

[0016] As a result, when changing the set temperature, the time required for the mixed water temperature to stabilize becomes shorter as the sampling time becomes faster. Furthermore, after the hot water temperature stabilizes, the sampling time returns to the original value, so the signal from the mixed hot water temperature detecting means 15 detects less uneven mixing, and hunting is less likely to occur, making it safer.

In the above embodiment, when the set temperature is changed by the setting means 17, the mixing valve control means 27 sends the difference between the changed set temperature and the current mixed water temperature to the sampling time setting means 31, and the sampling time is set. If the setting means 31 changes the sampling time according to this temperature difference, the time required for the mixed water temperature to become stable will be further shortened.

Next, another embodiment will be explained. Setting means 17
When changing the flow rate by the setting means 17 at time a in FIG. 5, the sampling time setting means 31 quickens the sampling time of the mixing valve control means 27 from the normal sampling time t1 to t2. do. Then, while the flow rate adjustment on-off valve control means 29 adjusts the flow rate adjustment on-off valve drive means 21 via the second drive amount setting means 30 so as to change the set flow rate, the mixing valve control means 27 adjusts the temperature of the mixed water. The current of the coil 26 is adjusted via the first drive amount setting means 28 so as to maintain the set temperature. When the difference between the set flow rate and the signal from the flow rate detection means 16 falls within a predetermined constant value (point b), the flow rate adjustment on-off valve control means 29 outputs a signal to the sampling time setting means 31. Upon receiving this signal, the sampling time setting means 31 sets the sampling time of the mixing valve control means 27 to the normal value t.
Return to 1.

As a result, when the temperature of the mixing section 13 is unstable at the time of changing the set flow rate, the sampling time becomes earlier, so that the time required to return the mixed water temperature to a stable value becomes shorter. Furthermore, after the hot water temperature stabilizes, the sampling time returns to the original value, so the signal from the mixed hot water temperature detecting means 15 detects less uneven mixing, and hunting is less likely to occur, making it safer.

Next, another embodiment will be explained. If the pressure on the primary side of the mixing valve 23 changes suddenly, this can be detected by the pressure detection means 32. In FIG. 6, when the pressure detection means 32 detects a sudden change in the primary side pressure of the mixing valve 23 at time a, this signal is sent to the sampling time setting means 3.
I'll send it to 1. The sampling time setting means 31 changes the sampling time on the mixing valve control means 27 side from the normal sampling time t1 to t2 because the mixing ratio changes when the signal of the pressure detection means 32 changes by more than a certain value within the sampling time.
do it quickly. The mixing valve control means 27 then adjusts the coil current via the first drive amount setting means 28 so that the mixed water temperature maintains the set temperature. When the pressure detection means 32 detects that the pressure on the primary side has stabilized, and the difference between the signal from the mixed water temperature detection means 15 and the signal from the setting means 17 falls within a predetermined constant value (point b), the mixing valve The control means 27 outputs a signal to the sampling time setting means 31. This signal causes the sampling time setting means 31 to return the sampling time of the mixing valve control means 27 to the normal value t1.

[0021] As a result, when the temperature of the mixing section 13 is unstable at the time of changing the set flow rate, the sampling time becomes earlier, so that the time required to return the mixed water temperature to a stable value becomes shorter. Furthermore, after the hot water temperature stabilizes, the sampling time returns to the original value, so the signal from the mixed hot water temperature detecting means 15 detects less uneven mixing, and hunting is less likely to occur, making it safer.

[0022]

As described above, according to the hot water mixing control device of the present invention, the following effects can be obtained. (1) When changing the set temperature, the sampling time of the mixing valve control means is accelerated until the mixed water temperature and the set temperature are within a certain value, thereby shortening the time it takes for the mixed water temperature to stabilize. (2) When changing the set temperature, change the sampling time of the mixing valve control means according to the difference between the set temperature and the current mixed water temperature until the mixed water temperature becomes stable regardless of the range of change in the set temperature. time becomes faster. (3) When changing the set flow rate, when the temperature of the mixing section is unstable, the sampling time of the mixing valve control means can be accelerated to shorten the time required to return the mixed water temperature to a stable value. (4) When the pressure on the primary side of the mixing valve changes suddenly, the mixing ratio changes, so the sampling time of the mixing valve control means can be accelerated to adjust the mixing valve so that the mixed water temperature maintains the set temperature. (5) In normal hot water supply conditions, the sampling time of the mixing valve control is not fast enough to detect mixing unevenness in the mixing section, so hot water at a stable and comfortable temperature can be supplied.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a hot water mixing control device in a first embodiment of the present invention.

[Figure 2] Control block diagram of hot water mixing control device

[Figure 3]
Output characteristic diagram of the control means

[Fig. 4] Output characteristic diagram of the control means in the first embodiment

[Fig. 5] Output characteristic diagram of the control means in the second embodiment

[Fig. 6] Output characteristic diagram of the control means in the third embodiment

[Figure 7] Cross-sectional view of a conventional hot water mixing control device

[Explanation of symbols]

1 Hot water flow path 2 Water flow path 15　Mixed water temperature detection means 18 Control means 20 Flow rate adjustment on/off valve 23 Mixing valve 32 Pressure detection means

Claims (5)

[Claims] 1. A hot water flow path and a water flow path, a mixing valve that adjusts the flow rates of the hot water flow path and the water flow path, a mixing valve driving means that drives the mixing valve, and a mixing water flow path that detects the temperature of the mixed water. It consists of a temperature detection means, a setting means for setting the mixed water temperature, and a control means for controlling the driving amount of the mixing valve driving means, and the control means uses a signal from the mixed water temperature detection means and a signal from the setting means. Mixing valve control means for determining the driving amount of the mixing valve driving means; and sampling time setting means for changing the sampling time of the mixing valve driving means using a signal from a means for detecting transient fluctuations or a means for causing transient fluctuations. A hot water mixing control device with 2. The hot water mixing control device according to claim 1, wherein the sampling time setting means is configured to change the sampling time of the mixing valve control means when the set temperature is changed by the setting means. 3. The hot water mixing control device according to claim 1, wherein the sampling time setting means changes the sampling time of the mixing valve control means in conjunction with the magnitude of the temperature change by the setting means. 4. A flow rate adjustment on-off valve for adjusting a mixed flow rate, a flow rate adjustment on-off valve driving means for driving the flow rate adjustment on-off valve, a flow rate detection means for detecting the mixed flow rate, and a flow rate adjustment on-off valve driving means for detecting the mixed flow rate. It has a flow rate adjustment opening/closing valve control means that controls the drive amount by a signal of the set mixing flow rate of the setting means and a signal of the flow rate detection means, and the sampling time setting means adjusts the sampling time of the mixing valve control means in conjunction with the flow rate control. The hot water mixing control device according to claim 1, wherein the hot water mixing control device is configured to change the hot water mixture. 5. Pressure detection means for detecting the pressure in at least one of the hot water flow path and the water flow path, and the sampling time setting means changes the sampling time of the mixing valve control means in conjunction with a signal from the pressure detection means. 2. The hot water mixing control device according to claim 1, wherein the hot water mixing control device has a configuration in which: