JP3466598B2 - Control device in fluid mixing device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a fluid mixing device, and more particularly to setting a temperature and a flow rate of a mixed fluid obtained by mixing two kinds of fluids, a high temperature and a low temperature, to a desired temperature and a desired flow rate. The present invention relates to a control device for.

[0002]

2. Description of the Related Art In many cases, it is desired that a mixed fluid obtained by mixing two kinds of fluids having different temperatures should have a desired temperature and a desired flow rate for a user. For example, in general households, mixed water obtained by mixing high-temperature water heated by a water heater and room-temperature water is used in a bathroom (bath or shower), or in a washroom or a kitchen.
Also, in hospitals and nursing facilities, mixed water is used in the same places as ordinary households. It is desired that the temperature and flow rate of the mixed fluid such as mixed water can be changed promptly and accurately according to the preference of the user.

When an extremely large amount of mixed fluid is used in a large-scale facility such as a manufacturing plant, a large boiler incorporating a high temperature / flow rate control system is used as a supply source of the high temperature fluid, and the mixed fluid is also used. Also, since a sophisticated control system for finely controlling the temperature and flow rate is used, it is possible to promptly obtain the mixed fluid having the desired temperature and flow rate accurately.

However, in general households and small-scale facilities, the fact is that the supply source of the high-temperature fluid is a water heater, which is cheaper and simpler than a boiler, Further, the system for adjusting the temperature and the flow rate of the mixed fluid itself is inexpensive and therefore simple, and as a result, the actual temperature and the actual flow rate of the obtained mixed fluid may be the desired temperature or a desired flow rate. That is a very rough thing. Moreover, when the desired temperature and the desired flow rate are changed, it is difficult to accurately and promptly converge to the desired temperature and the desired flow rate after the change.

The present invention has been made in view of the above circumstances, and an object thereof is to accurately and promptly obtain the actual temperature and the actual flow rate of a mixed fluid while using an inexpensive and simple device. It is an object of the present invention to provide a control device in a fluid mixing device capable of controlling a temperature and a desired flow rate.

[0006]

In order to achieve the above object, the present invention basically adopts the following solution method. That is, the first flow path to which the first fluid is supplied and the first flow path
A second flow path to which a second fluid having a temperature higher than that of the fluid is supplied, and the first fluid is connected to the first fluid and the second fluid via a merging portion.
A control device in a fluid mixing device, comprising: a third flow path in which a mixed fluid, in which a fluid and a second fluid are mixed, is made to flow, wherein a temperature of the first fluid flowing through the first flow path is A first temperature detecting means for detecting, a first flow rate adjusting means for adjusting a flow rate of the first fluid flowing through the first flow path, and a second temperature detecting means for detecting a temperature of the second fluid flowing through the second flow path.
Temperature detecting means, second flow rate adjusting means for adjusting a flow rate of the second fluid flowing through the second flow path, temperature setting means for setting a desired temperature of the mixed fluid flowing through the third flow path, and Flow rate setting means for setting a desired flow rate of the mixed fluid flowing through the third flow path, and flow through the first flow path based on the temperature detected by each of the temperature detecting means and the desired temperature and desired flow rate Flow rate calculating means for calculating a theoretical flow rate for the first fluid and calculating a theoretical flow rate for the second fluid that should flow through the second flow path;
Flow rate control means for controlling each of the flow rate adjusting means so that the theoretical flow rate calculated by the flow rate calculating means is obtained.

By adopting the above-mentioned basic solution method, basically, the required flow rates of the first fluid and the second fluid required to achieve the desired temperature and the desired flow rate can be accurately and promptly calculated. Thus, by controlling the flow rate adjusting means so as to realize this calculation result, the actual temperature and flow rate of the mixed fluid can be accurately and promptly set to the desired temperature and the desired flow rate. Further, the controller part constituting the flow rate calculating means and the flow rate controlling means is small and inexpensive, and since only two temperature detecting means and two flow rate adjusting means are used, the overall cost can be reduced.

On the premise that the above-mentioned basic solution method is adopted, the present invention further adopts the following solution methods as the first to fourth solution methods. That is, as a first solution method, as described in claim 1 in the scope of claims, first delaying after controlling either one of the first flow rate adjusting means and the second flow rate adjusting means. Is set to control the other. In this case, it is preferable to prevent mutual interference of flow rates, which is likely to occur when both flow rate adjusting means are controlled simultaneously, and to promptly and accurately converge the flow rates of the respective fluids to theoretically calculated flow rates.

On the premise of the first solution method (claim 1), the following can be carried out. That is, as described in claim 2 in the claims, the delay is started after the flow rate adjustment by the other flow rate adjusting means is started after the flow rate adjustment by the one flow rate adjusting means controlled earlier is completed. It can be set to be done. In this case, the first solution method (claim 1)
The effect corresponding to can be more sufficiently exerted.

As a second solution method, as described in claim 3 in the claims, the flow rate control means, when the control in the direction of increasing the flow rate of the second fluid is performed, The degree of change in the flow rate of the second fluid can be controlled to be smaller than that in the control in which the flow rate of the fluid is decreased. In this case, the control in the direction in which the temperature of the mixed fluid rises is performed slowly, which is preferable from the viewpoint of safety. Further, since the control in the direction in which the flow rate of the second fluid decreases is promptly performed, it is possible to satisfy both responsiveness and safety in a high level as a whole.

As a third solution method, as described in claim 4 in the claims, the flow rate control means controls to increase the flow rate of the first fluid and the flow rate of the second fluid, respectively. When performing, the control for increasing the flow rate of the second fluid may be set to be delayed with respect to the control for increasing the flow rate of the first fluid. In this case, it is preferable from a safety point of view to perform the control in the direction in which the temperature of the mixed fluid decreases first.

As a fourth solution method, as described in claim 5 in the claims, the flow rate control means reduces both the flow rate of the first flow path 1 and the flow rate of the second flow path 2. At the time of control, it is set so that the control for reducing the flow rate of the second flow path is performed first, and the control for reducing the flow rate of the first flow path is started after that. it can. In this case, it is preferable in order to prevent the situation where the temperature of the mixed water flowing through the third flow path becomes temporarily too hot.

A preferred embodiment based on the above-mentioned first to fourth solving methods is as described in claims 6 and below in the claims. That is,

The first fluid and the second fluid may each be water (corresponding to claim 6). In this case, general water can be used as the mixed fluid, which has a very wide field of use such as household use.

By disposing the second flow passage in the water heater, the second fluid flowing through the second flow passage is set to be heated in the water heater, and the first flow passage is set. It may be arranged so as to bypass the water heater (corresponding to claim 7). In this case, the water heater can be used as a supply source of heated water that becomes the high temperature second fluid.

The first flow path, the second flow path and the third flow path are arranged in the water heater, and the second flow path is set so that only the second flow path is heated in the water heater. A flow path may be set so as to constitute an outlet flow path of the water heater, and the mixed fluid may be hot water discharged from the water heater (claim 8). In this case, the hot water itself as the mixed fluid discharged from the water heater can have a desired temperature and a desired flow rate.

First flow rate detecting means for detecting the flow rate of the first fluid flowing through the first flow path, and second flow rate detecting means for detecting the flow rate of the second fluid flowing through the second flow path. Further, the flow rate control means includes the first flow rate adjusting means such that the actual flow rate detected by the first flow rate detecting means becomes the theoretical flow rate of the first fluid calculated by the flow rate calculating means. And feedback control of the second flow rate adjusting means such that the actual flow rate detected by the second flow rate detecting means becomes the theoretical flow rate of the second fluid calculated by the flow rate calculating means. It can be set as follows (corresponding to claim 9). In this case, the flow rate of each fluid is
Feedback control can be used to more accurately converge to the theoretical calculated flow rate.

[0018]

According to the present invention, a mixed fluid having a desired temperature and a desired flow rate can be promptly obtained.
In addition, an inexpensive and simple device is sufficient as a whole, which is suitable for home use and small-scale facilities.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION In FIG.
Is a second flow path, and 3 is a third flow path. Each of the downstream ends of the first flow path 1 and the second flow path 2 is connected to the upstream end of the third flow path, and a gathering portion of these three flow paths is a merging portion G. Normal temperature water as a low temperature first fluid is supplied (flows) to the first flow path 1 (for example, tap water is supplied as it is). Further, hot water as a high-temperature second fluid is supplied (flows) to the second flow path 2 from a water heater (not shown). Therefore, the third flow path 3
In the meantime, mixed water as a mixed fluid in which water at room temperature and hot water are mixed flows. Then, this third flow path 3
The (downstream end of) is opened as a hot water outlet at a place where hot water supply is desired, such as a bathroom, a kitchen, or a washroom in a general household or a small-scale facility.

A flow rate adjusting means 10 is connected to the first flow path 1, a temperature sensor 11 as a temperature detecting means is connected upstream of the flow rate adjusting means 10, and a flow rate is downstream of the flow rate adjusting means 10. A flow rate sensor 12 as a detection means is connected. Similarly, in the second flow path 2,
The flow rate adjusting means 20 is connected and the flow rate adjusting means 2 is connected.
0 on the upstream side of 0 as a temperature detecting means
1 is connected, and a flow rate sensor 22 as a flow rate detecting means is connected on the downstream side of the flow rate adjusting means 20. The connection position of the flow rate adjusting means, the temperature sensor, and the flow rate sensor is not limited to the above-described one, but can be changed as appropriate. For example, the flow rate adjusting means may be located on the most upstream side, the temperature sensor may be located on the most downstream side, or the flow rate sensor may be located on the most upstream side.

In the embodiment, the flow rate adjusting means 10 has a flow rate adjusting section 10A and a drive section 10B for changing the operating state of the flow rate adjusting section 10A. The flow rate adjusting unit 10A is the first
The opening area of the channel 1 is changed, and the valve element is provided in the first channel 1 (for example, a ball valve or the like). The drive unit 10B drives the valve body of the flow rate adjustment unit 10A (for example, a stepping motor).

Similarly, in the embodiment, the flow rate adjusting means 20 has a flow rate adjusting section 20A and a drive section 20B for changing the operating state of the flow rate adjusting section 20A. Flow rate adjustment unit 20A
Is for changing the opening area of the second flow path 2 and has a valve body disposed in the second flow path 2 (for example, a ball valve or the like). Further, the drive unit 20B includes the flow rate adjusting unit 2
It drives a 0 A valve body (for example, is constituted by a stepping motor).

In FIG. 1, U is a controller (control unit) constructed by using a microcomputer.
The controller U includes the above-mentioned temperature sensors 11 and 21.
A temperature signal indicating the temperature detected by the flow sensor 12,
A flow rate signal indicating the flow rate detected at 22 is input. Further, the controller U outputs a drive signal (flow rate signal) for causing a predetermined flow rate to flow to the drive units 10B and 20B described above. The drive control of the drive units 10B and 20B by the controller U is performed by the flow rate sensor 1
Feedback control is performed so that the flow rates detected at 2 and 22 become a predetermined target flow rate (calculated flow rate) calculated as described later.

The controller U is further supplied with operation signals from two manually operated switches 41 and 42. The switch 41 is for manually setting a desired temperature of the hot water flowing through the third flow path 3, and is operated by a user who uses the hot water discharged from the third flow path 3. The switch 42 is for manually setting the desired flow rate of the hot water flowing through the third flow path 3.
It is operated by the user who uses the hot water discharged from. Reference numeral 51 in FIG. 1 denotes a display device, which displays, for example, a desired temperature and a desired flow rate set by the switches 41 and 42, an actual temperature of the water flowing through the first flow path 1, a flow rate, and a second flow rate. The actual temperature and flow rate of the hot water flowing through the flow path 2 are displayed.

The controller U has an arithmetic unit 61, a control unit 62, and a drive circuit unit 63. As will be described later, the calculation unit 61 has a theoretical theoretical flow rate of normal temperature water flowing through the first flow path 1 required to achieve a desired temperature and a desired flow rate,
The theoretical theoretical flow rate of hot water flowing through the second flow path 2 is calculated. The control unit 62 realizes the above theoretical flow rates,
The drive circuit unit 63 is controlled. The drive circuit unit 63 drives the drive units 10B and 20B according to the control signal from the control unit 62. The control of the drive circuit unit 63 (that is, the drive units 10B and 20B) by the control unit 62 is feedback control based on the detection values of the flow rate sensors 12 and 22. It should be noted that the controller U uses the drive circuit unit 63.
Except for the above, a commercially available one-chip microcomputer (for example, H8 / 3664F manufactured by Hitachi Ltd.) can be used.

Next, the calculation of the theoretical flow rate by the calculation unit 61 will be described. First, the temperature detected by the temperature sensor 11 is T1, the temperature detected by the temperature sensor 21 is T2, the flow rate detected by the flow rate sensor 12 is L1, and the flow rate detected by the flow rate sensor 22 is l2. The temperature of the hot water is T3 and the flow rate is L3. In this case, the flow rate L flowing through the first flow path 1
The added value of 1 and the flow rate L2 flowing through the second flow path 2 becomes equal to the flow rate L3 flowing through the third flow path 3. That is, the following expression (1) is established.

[0027] L3 = L1 + L2 ... Formula (1)

Next, the added value of the heat quantity of the room temperature water flowing through the first flow path 1 and the heat quantity of the hot water flowing through the second flow path 2 becomes equal to the heat quantity of the hot water flowing through the third flow path 3. That is, the following expression (2) is established.

T3 × L3 = (T1 × L1) + (T2 × L2)
Formula (2)

From the above equations (1) and (2), the following equations (3) and (4) are obtained.

L1 = L3 × (T3-T2) / (T1-T2) ...
Formula (3)

[0032] L2 = L3-L1 ... Formula (4)

Now, let us say that the desired temperature of the hot water flowing through the third flow path 3 is TT3 and the desired flow rate is TL3. Further, the theoretical flow rate (theoretical flow rate) of water flowing through the first flow path 1 required to achieve the desired temperature TT3 and the desired flow rate TL3 is TL.
1 and TL2 is a theoretical flow rate (theoretical flow rate) of hot water flowing through the second flow path 2. T in the above formulas (3) and (4)
Substitute TT3 for L3, TL3 for L3, and T for L1
By substituting L1 and TL2 for L2, the following equations (5) and (6) are obtained.

TL1 = TL3 × (TT3-T2) / (T1-T2)
... Formula (5)

[0035] TL2 = TL3-TL1 (6)

The desired temperature TT3 and the desired flow rate TL3 are known values that are manually set by the user. The actual temperatures T1 and T2 are also known values detected by the temperature sensors 11 and 12. Therefore, the desired temperature TT3, the desired flow rate TL3, and the two actual detected temperatures T
1 and T2, the theoretical flow rate T of water to be flown into the first flow path 1
L1 is calculated, and the theoretical flow rate TL2 of hot water that should flow through the second flow path 2 can be calculated. That is, the calculation unit 61 calculates the theoretical flow rate TL for the first flow path 1 based on the above equation (5).
1 is calculated, and the theoretical flow rate TL2 for the second flow path 2 is calculated based on the above equation (6). Then, the control unit 62
Feedback controls the first flow rate adjusting means 10 (the drive section 10B thereof) via the drive circuit section 63 so that the actual flow rate L1 detected by the flow rate detection sensor 12 becomes the theoretical flow rate TL1. Similarly, the control unit 62 determines that the actual flow rate L2 detected by the flow rate sensor 22 is the theoretical flow rate TL2.
The feedback control of the second flow rate adjusting unit 20 (the drive unit 20B thereof) is performed via the drive circuit unit 63 so that

FIG. 2 is a flow chart showing the above-mentioned control contents of the controller U, and this flow chart will be described below. In the following description, Q indicates a step. First, at Q1, the temperatures T1 and T2 detected by the temperature sensors 11 and 12 and the flow rates L1 and L2 detected by the flow rate sensors 12 and 22 are read in addition to the switches 41 and 42.
The desired temperature TT3 and the desired flow rate TL3 corresponding to the operating state of are read. Then, in Q2, the equation (5),
From (6), theoretical flow rates TL1 and TL2 are calculated.

In Q3, the calculated TL1 and TL2 are
It is determined whether each is within the upper limit range. That is, it is determined whether the theoretical flow rate TL1 does not exceed the maximum flow rate of the first flow path 1 or the theoretical flow rate TL2 does not exceed the maximum flow rate of the second flow path 2. Each theoretical flow rate TL1, TL2
Is within the upper limit range, in Q4, the actual flow rate L1 detected by the flow rate sensor 12 is the theoretical flow rate TL.
Feedback control is performed so that the actual flow rate L2 detected by the flow rate sensor 22 is equal to the theoretical flow rate TL.
Feedback control is performed so that the value becomes 2. If the determination in Q4 is NO, it means that the request cannot be controlled.
An alarm is issued (for example, the display 51 indicates that control is impossible). In addition, when the process of Q5 is performed, the user is made to select the control which gives priority to the desired temperature or the control which gives priority to the desired flow rate, and the control which satisfies only one of the selected ones is performed. (However, the desired temperature is in the range of T1 to T2).

FIG. 3 shows an example in which hot water discharged from a water heater is used as a high temperature second fluid. That is, 71 in FIG. 3 shows a gas type water heater. Second
The flow path 2 is disposed in the water heater 71, and is heated by the combustion gas of the water heater 71 in the middle thereof.
2 are configured. Then, outside the water heater 71 and on the downstream side thereof, each component 20 shown in FIG.
A unit body 82 in which 21 and 22 are set is connected. The first flow path 1 bypasses the water heater 71, and is connected to a unit body 81 in which the constituent elements 10, 11, and 12 shown in FIG. 1 are set. The two unit bodies 81 and 82 may be combined to form one unit body 83.

In FIG. 4, the components 72, 83 (81, 82) shown in FIG. 3 are incorporated in a water heater 71A,
The case where the temperature of the hot water discharged from the water heater 71A is set to the desired temperature and the flow rate is set to the desired flow rate is shown. That is, the first flow path 1 and the second flow path 2 are arranged in the water heater 71A, and the heat receiving portion 72 that is heated by the combustion gas is formed in the middle of the second flow path 2. The merging portion G is set in the water heater 71A, and the discharge pipe of the water heater 71A is the third flow path 3.

Next, some preferable examples of performing the feedback control (contents of Q4 in FIG. 2) by the above-mentioned controller U will be described. First, when it is necessary to adjust (control) both of the two flow rate adjusting means 10 and 20, either one of them can be controlled first, and then the other can be controlled with a delay. . In this case, it is possible to start the subsequent control after the actual flow rate of the flow path to be controlled becomes the theoretical flow rate by the control performed above. As described above, by starting the control before and after, the interference of the flow rate between the first flow channel 1 and the second flow channel 2 via the merging portion G is avoided, and the flow rate is promptly converged to the theoretical flow rate. It is preferable for the purpose.

Secondly, in the second flow path 2 through which the hot water flows, the increase in the flow rate tends to increase the temperature of the mixed water. Therefore, from a safety point of view, the flow rate decreases to the lower temperature of the mixed water. It is preferable to reduce the degree of change in the flow rate as compared with the above case. As a method of changing the degree of flow rate change, an appropriate method such as changing the control gain of feedback control can be used.

Thirdly, when the control is performed so as to increase both the flow rate of the first flow channel 1 and the flow rate of the second flow channel 2, the flow rate of the first flow channel 1 in which low-temperature water flows first is increased. It is possible to start the control and then start the control of increasing the flow rate of the second flow path 2 through which the hot water flows after a delay. When controlling to reduce both the flow rate of the first flow path 1 and the flow rate of the second flow path 2, the control of decreasing the flow rate of the second flow path 2 is performed first, and after that, the flow rate of the first flow path 1 is delayed. It is possible to start the control for reducing All of these are preferable in order to reliably prevent the situation where the temperature of the mixed water flowing through the third flow path 3 becomes temporarily too hot.

Fourthly, in the case of performing feedback control for finally achieving the theoretical flow rate, the first flow path 1 and the second flow path 2
In order to prevent or reduce the flow rate interference between and, and to prevent the temperature of the mixed water from changing suddenly,
It is preferable to gradually change the flow rate, not to change the flow rate to the theoretical flow rate at once. For this gradual flow rate change, for example, the provisional target flow rate is updated and set every predetermined time so as to gradually change from the current actual flow rate toward the theoretical flow rate, and finally converges to the theoretical flow rate. (The feedback control is performed so that the provisional target flow rate is obtained, and the provisional target flow rate finally matches the theoretical flow rate). Of course, this gradual flow rate change is performed within a range that can sufficiently meet the user's request for a quick flow rate change (for example, converge to the theoretical flow rate within 5 seconds).

The controller U is configured to have two microcomputers (may be installed together at the same place or may be installed at separate places) and communicate with each other to communicate with each other. It is also possible to monitor the abnormality and issue an alarm when there is an abnormality in either one (for example, an abnormality display on the display means 51).

The switch for setting the desired temperature and the desired flow rate can be constituted by, for example, one operating member, for example, one operating lever. In this case, the operation lever can be moved up and down around a predetermined axis and can be rotated in a direction orthogonal to the predetermined axis so that the vertical movement position of the operation lever and the desired temperature can be associated with each other to rotate the operation lever. It suffices that the position be associated with the desired flow rate (the vertical movement position is detected by the first sensor, and the rotation position is detected by the second sensor). If such an operation lever is fixedly installed in, for example, the third flow path 3, it can correspond to an existing operation lever for temperature and flow rate adjustment used in a general household (however, the present invention In case of, it is not necessary to actually adjust the flow rate with the operating lever itself). Further, this operation lever can be set in the vicinity of the merging portion G, and the unit body 83 shown in FIG. 3 can be mounted in the mounting base of the operation lever, and the controller U can also be mounted (FIG. 1). Switches 41, 42, sensors 11, 12, 2
1, 22, and the flow rate adjusting means 10, 20 as one unit).

Although the embodiment has been described above, the present invention is not limited to this, and includes the following cases, for example. The fluid is not limited to water, but any appropriate fluid can be used. The flow rate detecting means for detecting the flow rate of the first flow path 1 may be obtained (detected) by calculation from the detected flow rates of the other flow paths. For example, the flow rate of the first flow path 1 is detected by the flow rate detection means connected to the second flow path 2 from the detected flow rate of the flow rate detection means connected to the third flow path 3 (including the merging portion G). It can be obtained by subtracting the detected flow rate. Similarly, to detect the flow rate of the second flow path 2,
It can be obtained by subtracting the flow rate detected by the flow rate detection means connected to the first flow path 1 from the flow rate detected by the flow rate detection means connected to the third flow path 3 (including the merging portion G). it can. Each step (group of steps) shown in the flowchart or various members such as a sensor and a switch can be expressed by adding the name of the means to the higher level expression of the function. Further, the function of each step (step group) shown in the flow chart can be expressed as the function of the functional unit set in the control unit (controller) (the existence of the functional unit). Of course, the object of the present invention is not limited to what is specified, and also implicitly includes providing what is expressed as substantially preferable or advantageous. Furthermore, the present invention can be expressed as a control method.

[Brief description of drawings]

FIG. 1 is an overall system diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart showing the control contents of the controller shown in FIG.

FIG. 3 is a simplified system diagram showing an example in which a high temperature second fluid is obtained from a water heater.

FIG. 4 is a simplified system diagram showing an example in which a water heater can discharge hot water having a desired temperature and a desired flow rate.

[Explanation of symbols]

1: First flow path 2: Second channel 3: Third channel 10, 20: First flow rate adjusting means 11, 21: Temperature sensor 12, 22: Flow rate sensor 41: Desired temperature setting switch 42: Desired flow rate setting switch 61: Calculation unit of theoretical flow rate 62: Flow rate control unit 63: Drive circuit section 71, 71A: Water heater 72: Heat receiving part U: Controller

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A 8-266878 (JP, A) JP-A 10-43572 (JP, A) JP-B 2-25090 (JP, B2) Jpn. 5972 (JP, Y1) Jitsuko Sho 51-1095 (JP, Y2) Patent 3155255 (JP, B1) (58) Fields investigated (Int.Cl. ⁷ , DB name) B01F 15/00-15/06

Claims (9)

(57) [Claims] 1. A first flow path to which a first fluid is supplied, a second flow path to which a second fluid having a temperature higher than that of the first fluid is supplied, and a first flow path and a second flow path through a merging portion. A control device in a fluid mixing device, comprising: a third flow path in which a mixed fluid in which the first fluid and the second fluid are mixed to flow with a fluid is allowed to flow. First temperature detecting means for detecting the temperature of the first fluid flowing, first flow rate adjusting means for adjusting the flow rate of the first fluid flowing in the first flow path, and second flow rate flowing in the second flow path Second temperature detecting means for detecting the temperature of the fluid; second flow rate adjusting means for adjusting the flow rate of the second fluid flowing through the second flow path; and desired temperature of the mixed fluid flowing through the third flow path. A temperature setting means for setting and a flow rate setting hand for setting a desired flow rate of the mixed fluid flowing through the third flow path. And calculating a theoretical flow rate for the first fluid that should flow through the first flow path based on the temperature detected by each of the temperature detection means and the desired temperature and the desired flow rate, and Flow rate calculation means for calculating a theoretical flow rate for the second fluid to flow through, and flow rate control means for controlling each flow rate adjustment means so that the theoretical flow rate calculated by the flow rate calculation means is provided . The flow rate control means includes the first flow rate adjusting means and the second flow rate.
After controlling either one of the adjustment means first,
A control device in a fluid mixing device, wherein the control device is set to control the other . 2. The delay according to claim 1 , wherein the delay is set so that the flow rate adjustment by the other flow rate adjusting means is started after the flow rate adjustment by the one flow rate adjusting means controlled earlier is completed. A control device in a fluid mixing device. 3. A first flow path to which a first fluid is supplied, and a first flow.
Confluence with the second flow path, which is supplied with a second fluid that is hotter than the body
The first flow connected to the first fluid and the second fluid via a section.
The mixed fluid of the body and the second fluid is allowed to flow.
Control device in a fluid mixing device having a third flow path
A is, first detects the temperature of the first fluid flowing through the first flow path
A first temperature detecting means and a first temperature detecting means for adjusting a flow rate of the first fluid flowing through the first flow path.
A first flow rate adjusting means and a first flow rate adjusting means for detecting the temperature of the second fluid flowing through the second flow path.
A second temperature detecting means and a first temperature adjusting means for adjusting the flow rate of the second fluid flowing through the second flow path.
(2) Flow rate adjusting means and a desired temperature of the mixed fluid flowing through the third flow path are set.
And a desired flow rate of the mixed fluid flowing through the third flow path.
Flow rate setting means, the temperature detected by each of the temperature detecting means and the desired temperature.
And flow through the first flow path based on desired flow rate
Calculating the theoretical flow rate for the first fluid,
Theoretical flow for the second fluid to flow through the second flow path
Flow rate calculating means for calculating the amount and the theoretical flow rate calculated by the flow rate calculating means
And a flow rate control means for controlling each of the flow rate adjusting means,
The flow rate control means includes a change in the flow rate of the second fluid when performing control in a direction to increase the flow rate of the second fluid, as compared to when performing control in a direction to decrease the flow rate of the second fluid. A control device in a fluid mixing device, wherein the control is performed so that the degree of 4. A first flow path to which a first fluid is supplied, and a first flow.
Confluence with the second flow path, which is supplied with a second fluid that is hotter than the body
The first flow connected to the first fluid and the second fluid via a section.
The mixed fluid of the body and the second fluid is allowed to flow.
Control device in a fluid mixing device having a third flow path
A is, first detects the temperature of the first fluid flowing through the first flow path
A first temperature detecting means and a first temperature detecting means for adjusting a flow rate of the first fluid flowing through the first flow path.
A first flow rate adjusting means and a first flow rate adjusting means for detecting the temperature of the second fluid flowing through the second flow path.
A second temperature detecting means and a first temperature adjusting means for adjusting the flow rate of the second fluid flowing through the second flow path.
(2) Flow rate adjusting means and a desired temperature of the mixed fluid flowing through the third flow path are set.
And a desired flow rate of the mixed fluid flowing through the third flow path.
Flow rate setting means, the temperature detected by each of the temperature detecting means and the desired temperature.
And flow through the first flow path based on desired flow rate
Calculating the theoretical flow rate for the first fluid,
Theoretical flow for the second fluid to flow through the second flow path
Flow rate calculating means for calculating the amount and the theoretical flow rate calculated by the flow rate calculating means
And a flow rate control means for controlling each of the flow rate adjusting means,
Wherein the flow control means, when performing control to increase respectively the flow rate and the flow rate of the second fluid in the first fluid,
A control device in a fluid mixing device, wherein the control for increasing the flow rate of the second fluid is set to be delayed with respect to the control for increasing the flow rate of the first fluid. 5. A first flow path to which a first fluid is supplied, and a first flow.
Confluence with the second flow path, which is supplied with a second fluid that is hotter than the body
The first flow connected to the first fluid and the second fluid via a section.
The mixed fluid of the body and the second fluid is allowed to flow.
Control device in a fluid mixing device having a third flow path
A is, first detects the temperature of the first fluid flowing through the first flow path
A first temperature detecting means and a first temperature detecting means for adjusting a flow rate of the first fluid flowing through the first flow path.
A first flow rate adjusting means and a first flow rate adjusting means for detecting the temperature of the second fluid flowing through the second flow path.
A second temperature detecting means and a first temperature adjusting means for adjusting the flow rate of the second fluid flowing through the second flow path.
(2) Flow rate adjusting means and a desired temperature of the mixed fluid flowing through the third flow path are set.
And a desired flow rate of the mixed fluid flowing through the third flow path.
Flow rate setting means, the temperature detected by each of the temperature detecting means and the desired temperature.
And flow through the first flow path based on desired flow rate
Calculating the theoretical flow rate for the first fluid,
Theoretical flow for the second fluid to flow through the second flow path
Flow rate calculating means for calculating the amount and the theoretical flow rate calculated by the flow rate calculating means
In, and a flow control means for controlling said respective flow rate adjusting means, the flow control means, the first flow path 1 flow rate and the second flow passage 2
When controlling to reduce both flow rates, the flow rate of the second flow path
Is controlled first, and then the first flow path is delayed after that.
Is set to start the control to reduce the flow rate of
A control device in a fluid mixing device, comprising: 6. A any one of claims 1 to 5, wherein the first and second fluids are respectively water, that the control device in the fluid mixing apparatus according to claim. 7. The method according to claim 6 , wherein the second flow path is provided in a water heater.
A fluid characterized in that the second fluid flowing through the second flow path is set so as to be heated in the water heater, and the first flow path is arranged so as to bypass the water heater. Control device in the mixing device. 8. The water heater according to claim 6 , wherein the first flow passage, the second flow passage, and the third flow passage are arranged so that only the second flow passage is heated in the water heater. And the third flow path is set so as to constitute an outlet flow path of the water heater, and the mixed fluid is hot water discharged from the water heater. apparatus. 9. The method of claim 1 or any one of the <br/> Oite of claim 5, a first flow rate detecting means for detecting the flow rate of the first fluid flowing through the first flow path, said first A second flow rate detecting means for detecting a flow rate of the second fluid flowing through the two flow paths, wherein the flow rate control means is the actual flow rate detected by the first flow rate detecting means. The first calculated
The first flow rate adjusting means is feedback-controlled so as to be the theoretical flow rate of the fluid, and the actual flow rate detected by the second flow rate detecting means is calculated by the flow rate calculating means with respect to the second fluid. A control device for a fluid mixing device, wherein the second flow rate adjusting means is set to perform feedback control so as to obtain a theoretical flow rate.