JPH05333943A - Liquid mixing device - Google Patents

Abstract

PURPOSE:To adjust the temperature of the hot water mixed with the cold water by controlling the mixture ratio between the hot water and the cold water in a simple constitution of a hot water supply device. CONSTITUTION:A hot water supply device 1 mixes the hot water supplied through a hot water pipe 5H with the cold water supplied through a cold water pipe 5C and discharges the mixed hot water through a mixture pipe 5M. At the same time, a control signal is transmitted to a flow rate control valve 100 from an electronic controller 80. Thus, the flow rate is controlled to the valve 100 and then the downstream pressure of a pressure control valve 200 is changed in the pipe 5H by the liquid supplied from the valve 100. The valve 200 functions to control the flow rate in order to approximate the downstream pressure to a set level and thereby, can compensate the pressure caused by the flow rate changed by the control of the valve 100. In such a constitution, the flow rate of the hot water mixed with the cold water is kept constant and the temperature is adjusted just with control of the flow rate carried out to the valve 100.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid mixing device for mixing liquids, and more particularly to a device for adjusting a mixing ratio of liquids.

[0002]

2. Description of the Related Art Conventionally, as a liquid mixing apparatus of this type,
For example, a hot water supply device disclosed in JP-A-56-129919 is known. That is, the conventional hot water supply device is provided with a flow rate control valve in a high temperature water side pipe line for circulating high temperature water,
A flow rate control valve is also provided in the low temperature water side pipe through which the low temperature water flows, and the mixed hot water is discharged at a constant flow rate from the mixing pipe connecting both pipes. Then, in order to change the temperature of the mixed hot water while keeping the mixed hot water at a constant flow rate, both flow rate control valves are controlled at the same time.

[0003]

However, in the conventional hot water supply apparatus, in order to change the temperature of the mixed hot water, the flow rate control valves on the high temperature water side and the low temperature water side must be controlled at the same time, and the control is complicated. There was a problem of becoming.

The present invention solves the above-mentioned problems of the prior art and is realized with a simple structure for adjusting the mixing ratio of the first fluid and the second fluid to the target mixing ratio. It is an object of the present invention to provide a liquid mixing device that can be used.

[0005]

The present invention, which has been made to solve the above-mentioned problems, provides a first liquid flowing through a first pipeline and a second liquid flowing through a second pipeline. In a liquid mixing apparatus that mixes and discharges the mixed mixed liquid through a mixing conduit, the liquid mixing device is provided in one of the first conduit and the second conduit, A flow rate control valve having a drive section for changing the flow rate; a pressure control valve provided in the other of the two pipelines for regulating the pressure on the downstream side of the pipeline toward a set pressure; First
Control signal to the drive unit of the flow rate control valve in accordance with the target mixing ratio setting means for setting the target mixing ratio of the liquid and the second liquid, and the target mixing ratio set by the target mixing ratio setting means. Flow rate control means for adjusting the flow rate of the liquid flowing through the flow rate control valve by sending the flow rate control valve.

The invention of claim 2 is characterized in that the high temperature liquid flowing through the first conduit and the low temperature liquid flowing through the second conduit are of the same type as the above high temperature liquid but lower than the high temperature liquid. In a liquid mixing apparatus for mixing a liquid and discharging the mixed liquid through a mixing pipe, the electric drive signal is provided in one of the first pipe and the second pipe. A flow rate control valve having a drive unit for changing the flow rate by means of, and a pressure control valve provided on the other of the two pipelines, for regulating the pressure on the downstream side of the pipeline toward the set pressure, Flowing through the flow rate control valve by sending a control signal to the drive unit of the flow rate control valve according to the target temperature setting means for setting the target temperature of the mixed liquid and the target temperature set by the target temperature setting means. Flow control means for adjusting the flow rate of the liquid Characterized by comprising a.

Further, the invention according to claim 3 is the structure according to claim 1 or 2, wherein the pressure control valve is provided with a pressure setting part capable of changing the set pressure.

Further, according to a fourth aspect of the present invention, in addition to the third aspect, the pressure setting portion of the pressure control valve has a drive portion for changing the set pressure by an electric drive signal, and a target of the mixed liquid. A mixed liquid flow rate setting means for setting a flow rate, and a flow rate control means for controlling the set pressure by sending a control signal to the drive unit of the pressure control valve according to the target flow rate set by the mixed liquid flow rate setting means. It is the structure provided with.

[0009]

In the liquid mixing apparatus according to the first aspect of the present invention,
The first liquid flowing through the first conduit and the second liquid flowing through the second conduit are mixed at the target mixing ratio set in the target mixing ratio setting means, and the mixed liquid is mixed through the mixing conduit. Is discharged.

The adjustment to the target mixing ratio is performed by sending a control signal from the flow rate control means to the drive section of the flow rate control valve. That is, when the mixed liquid is discharged from the mixing conduit, it is regulated to a predetermined pressure determined by the flow path resistance of the mixing conduit. Now, when the flow rate control means controls the flow rate control valve to increase or decrease the flow rate, the liquid flowing from the flow rate control valve changes the pressure of the mixed liquid in the mixing conduit. This pressure change appears as a pressure change on the downstream side of the pressure control valve in the other pipeline. The pressure control valve is a valve that regulates the flow rate of the pressure on the downstream side toward the set pressure. Therefore, the flow rate is increased or decreased so as to compensate the increased or decreased pressure by the control of the flow rate control valve. Therefore, the mixing ratio of the mixed liquid is adjusted only by controlling the flow rate of the flow rate adjusting valve while keeping the flow rate constant based on the predetermined pressure determined by the flow path resistance of the mixing pipeline.

According to a second aspect of the present invention, liquids of the same type and different temperatures are used as the first liquid and the second liquid of the first aspect of the invention, and the mixing ratio of the mixed liquid is changed. The temperature is controlled.

According to the third aspect of the invention, in addition to controlling the mixing ratio of the mixed liquid, the set pressure of the pressure control valve is changed to change the flow rate of the mixed liquid. The maximum flow rate of the mixed liquid is
Determined by the maximum flow rate specified by the set pressure of the pressure control valve,
The control of the mixing ratio by the flow rate control valve and the pressure control valve is performed within the range of this maximum flow rate. Therefore, the flow rate of the mixed liquid can be changed by changing the set pressure of the pressure control valve.

According to the fourth aspect of the present invention, the set pressure of the pressure control valve is electrically controlled to control the flow rate of the mixed liquid. That is, when the target flow rate of the mixed liquid is set by the mixed liquid flow rate setting means, the flow rate control means sends a control signal for determining the set pressure according to the target flow rate to the drive section of the pressure control valve. As a result, the set pressure of the pressure control valve is changed, and the flow rate of the mixed liquid is increased / decreased toward the target flow rate.

[0014]

Preferred embodiments of the present invention will be described below in order to further clarify the constitution and operation of the present invention described above.

FIG. 1 is a schematic configuration diagram showing a hot water supply device used in a bathroom, a kitchen or the like according to this embodiment. This water heater 1
Mixing in which a low temperature water side conduit 5C for circulating low temperature water, a high temperature water side conduit 5H for circulating high temperature water, and both conduits are connected and a mixed hot water in which the low temperature water and the high temperature water are mixed is circulated. And a conduit 5M.

The low temperature water side conduit 5C is provided with a first check valve 10 and a flow rate control valve 100 for adjusting the flow rate by an electric control signal, and the high temperature water side conduit 5H.
Is provided with a second check valve 20 and a pressure control valve 200 capable of adjusting the set pressure by an electric control signal.
Further, an opening / closing valve 300 is provided in the mixing pipeline 5M. The flow rate control valve 100 includes a control unit 100M including a stepping motor and the like, and the flow rate of low temperature water can be controlled by sending a control signal to the control unit 100M. Further, the pressure control valve 200 includes a control unit 200M including a stepping motor and the like, and the set pressure can be changed by sending a control signal based on a target value for the set pressure to the control unit 200M.

Further, the hot water supply device 1 is provided with a control means for controlling the temperature of the mixed hot water. That is, the control means is provided in the mixing conduit 5M and detects the temperature of the mixed hot water, the target temperature setting device 60 for setting the target temperature, the flow rate sensor 70, the temperature sensor 50, The electronic control unit 80 is provided with the detection signal from the flow rate sensor 70 and the target temperature signal from the target temperature setting device 60 as input signals.

The electronic control unit 80 is composed of a microcomputer and the like, and has a well-known CPU 81, ROM 83 and R.
The AM 85 and the backup RAM 87 are mainly configured as a logical operation circuit, and input / output with the outside is performed by an input / output port 89 which is connected to them through a common bus 91. The temperature sensor 50 is connected to the input / output port 89.
Etc. are connected, and the control unit 10 of the flow rate control valve 100 is connected.
Motor drive units 93 and 95 for sending control signals to the control unit 200M of the pressure control valve 200 are connected to 0M.

The electronic control unit 80 reads the temperature detection signal and the target temperature signal and executes flow rate control on the flow rate control valve 100 according to a predetermined program, that is, at the target temperature, The flow rate control valve 100 controls the flow rate so that the temperatures of the mixed hot water coincide with each other, and the control for changing only the flow rate of the low temperature water is executed.

That is, the flow rate of the low temperature water is QC, the flow rate of the high temperature water is QH, the temperature detected by the temperature sensor 50 based on the mixed hot water is T, the flow rate is Q, and the target temperature in the target temperature setter 60 is Where TS is the pressure and PS is the set pressure of the pressure control valve 200, the electronic control unit 80 increases or decreases the flow rate QC so that the detected temperature T reaches the target temperature TS.
At this time, the pressure control valve 200 increases or decreases the flow rate QH so as to maintain the pressure in the mixing conduit 5M at the set pressure PS, so that the mixing flow rate Q is kept constant.

Next, regarding the operation of the hot water supply device 1, the mixed hot water is discharged at a predetermined flow rate QY from the state where the mixed hot water is not discharged, and the temperature is controlled by changing the mixing ratio, and then the water is stopped. This will be described by a series of operations up to.
The set pressure of the pressure control valve 200 is set to PSY and the target temperature of the target temperature setter 60 is set to TS.

First, the flow rate control valve 1 from the electronic control unit 80.
00, a control signal is sent to increase the opening degree of the flow rate control valve 100, and then the opening / closing valve 300 is fully opened.
In this state, the low temperature water that has passed through the flow rate control valve 100 is discharged through the mixing conduit 5M. At this time, the pressure of the mixing conduit 5M is adjusted to a predetermined pressure determined by the flow resistance of the mixing conduit 5M, and is applied to the downstream side of the pressure control valve 200.
Here, if the pressure in the mixing conduit 5M exceeds the set pressure PSY, the hot water does not flow from the pressure control valve 200.

When the detected temperature T input from the temperature sensor 50 is lower than the target temperature TS, the electronic control unit 80 controls the flow rate control valve 100 to reduce the flow rate. As a result, the low temperature water flowing from the flow rate control valve 100 changes the pressure of the mixed hot water in the mixing pipeline 5M. This pressure change appears as a pressure change on the downstream side of the pressure control valve 200 in the other high temperature water side conduit 5H. Since the pressure control valve 200 is a valve that regulates the flow rate of the pressure on the downstream side toward the set pressure PSY, the flow rate control valve 10
The zero flow control increases its flow rate to compensate for the reduced pressure.

This relationship will be described with reference to FIG. In FIG. 2, the vertical axis shows the flow rate QC of low-temperature water and the horizontal axis shows the flow rate QH of high-temperature water. Here, when the set pressure of the pressure control valve 200 is PSY, the relationship between the flow rate QC and the flow rate QH is represented by the straight line AY. That is, when the flow rate control valve 100 is in the fully open state, the pressure of the flow rate control valve 100 changes to the pressure control valve 200.
To the set pressure PSY or more, the pressure control valve 200 is closed, and the flow rate QCYM of the flow control valve 100 at this time is
Is the flow rate of the mixed hot water QY. Here, when the detected temperature T is lower than the target temperature Ts, the flow rate control valve 100 is gradually closed to reduce the flow rate by ΔQ, and the reduced flow rate ΔQ further lowers the pressure of the mixed hot water. Pressure control valve 20
The pressure on the downstream side of 0 is reduced. The pressure control valve 200 is
When the pressure on the downstream side falls below the set pressure PSY, the flow rate corresponding to the decrease on the downstream side is increased by ΔQ so as to maintain the set pressure PSY. When this relationship is shown by an equation, the flow rate Q
Y is (QC-.DELTA.Q) + (QH + .DELTA.Q), which is a constant flow rate. On the other hand, when the detected temperature T is higher than the target temperature TS, the opening degree of the flow rate control valve 100 is increased to increase the amount of low temperature water, so that the high temperature water through the pressure control valve 200 has the same pressure control valve as that described above. It is automatically reduced by the action of 200. Then, the electronic control unit 80 detects the detected temperature T
Control is executed so that the temperature reaches the target temperature TS.

The temperature controllable range of the mixed hot water is the minimum temperature when the pressure control valve 200 is fully closed, and the maximum temperature when the pressure control valve 200 is fully open. The range in which the flow rate of the mixed hot water can be controlled is the range in which the set pressure PSY on the downstream side can be set.

The on / off valve 300 is used to stop the mixed hot water.
Fully closed. At this time, when the on-off valve 300 is fully closed and the mixed hot water is stopped, the mixing pipe 5M moves to the low temperature water side pipe 5
Although the pressure to C and the high temperature water side conduit 5H becomes large, the first check valve 1 is provided to the low temperature water side conduit 5C and the high temperature water side conduit 5H.
Since the zero check valve and the second check valve 20 are provided, it is possible to prevent reverse flow to the upstream side via the flow rate control valve 100 and the pressure control valve 200.

According to the above embodiment, the flow rate Q of the mixed hot water is
It is possible to control the temperature by controlling the mixing ratio while maintaining the relationship that the flow rate is equal to QC + QH and constant, but at this time, the control can be performed only by controlling the flow rate control valve 100. It has the effect of being easy.

The flow rate Q of the mixed hot water is controlled by the electronic control unit 8.
This can be done by sending a control signal from 0 to the pressure control valve 200 to change the set pressure PS. Pressure control valve 200
The reason why the flow rate of the mixed hot water can be changed by changing the set pressure PS of is as follows. As described above, when the flow rate control valve 100 is fully closed, high temperature water flows only from the pressure control valve 200, so the maximum flow rate determined by the set pressure PS of the pressure control valve 200 is the flow rate of the mixed hot water. is there. Therefore, the set pressure of the pressure control valve 200 is set to PS, PSX, PSX
When changed to SY, PSZ, the maximum flow rate that can flow from the pressure control valve 200 is QHXM, QHYM, QHZM.
... is changed (Fig. 2). Within the range of this maximum flow rate, the mixing ratio of the high temperature water and the low temperature water can be changed as described above. Therefore, by changing the set pressure PS, it is possible to change the maximum flow rate that flows out from the pressure control valve 200, that is, the flow rate range in which the mixing ratio can be controlled. The electronic control unit 80 sends a control signal to the pressure control valve 200 to perform control to change the set pressure PS.

Next, the actual temperature control of the mixed hot water by the hot water supply device 1 will be described with reference to the flowchart shown in FIG. Now, when the start switch (not shown) of the water heater 1 is turned on, the electronic control unit 80 is activated. When the electronic control unit 80 is activated, a predetermined program stored in the ROM 83 is executed. First, step 110 is executed after initialization processing such as resetting the initial value and processing for fully closing the on-off valve 300. In step 110,
A target set pressure PSM is required. This target set pressure PSM
Is a value corresponding to the initial flow rate desired to be discharged as the mixed hot water, and is a value obtained based on, for example, a predetermined value or a value of a sensor or the like that measures the opening degree of the opening / closing valve 300.
In the following step 115, the deviation ΔPS between the current set pressure PS and the target set pressure PSM is calculated, and in step 120, the mixture ratio control number CT1 is calculated by the following equation (1).
Is executed. CT1 = INT {(PSM-PS) / ΔPSK} (1) where ΔPSK represents a predetermined value of change pressure, and INT represents a function for extracting a positive integer value from the calculated value. Therefore,
The mixture ratio control number CT1 means the number of times of increasing / decreasing control of the set pressure PS of the pressure control valve 200 for each predetermined change pressure ΔPSK.

In the following step 125, it is determined whether or not the following processing has been executed by the mixing ratio control number CT1 by comparing the counter CT and the mixing ratio control number CT1. In the first process, a negative determination is made, so the process proceeds to step S130.

In step 130, a signal for changing the flow rate QC of the low temperature water is sent to the control section 100M of the flow rate control valve 100. At this time, assuming that the flow rate to be changed is ΔQCK, ΔQCK indicates that the set pressure of the pressure control valve 200 is PS1.
Is set to 1/2 of the maximum flow rate QH1M.

In the following step S135, the pressure control valve 2
A control signal for changing the set pressure PS by the above-mentioned ΔPSK is sent to the control unit 200M of 00. In a succeeding step S140, a standby process for delaying a predetermined time is performed. Thereby, based on the pressure adjusting function of the pressure adjusting valve 200, the high temperature water is mixed with the low temperature water and the mixed hot water having a predetermined temperature is discharged. In the next step S145, the counter CT is incremented and the process returns to step S125. Then, the processing from step S125 to step 145 is repeatedly executed, and the counter CT indicates the mixture ratio control count CT1.
When the counter C is exceeded, the process proceeds to step S150, and the counter C
After resetting T, this process is terminated. The temperature control at the start of water discharge is executed by such a series of processes.

On the other hand, the control of the water discharge temperature in the steady state after the water discharge is started is executed by the process shown in the flowchart of FIG. First, in step S205, the target temperature TS set in the target temperature setter 60 is read, and in the subsequent step S210, the detected temperature T of the temperature sensor 50 is read. In step S215, the temperature difference ΔT between the target temperature TS and the detected temperature T is calculated. If this temperature difference ΔT is equal to or higher than the predetermined temperature ΔTK, the controller 100M of the flow rate control valve 100 is notified to the controller 100M in step S220. For the above flow rate QC
A command to increase or decrease is issued. On the other hand, if the temperature difference ΔT is less than or equal to the predetermined temperature ΔTK in step 215, the control of the flow rate control valve 100 is not executed. That is, FIG.
By the control of the flowchart of (1), the feedback control for the flow rate control valve 100 is executed so that the temperature of the mixed hot water becomes the target temperature TS.

The temperature control of the mixed hot water by the hot water supply apparatus 1 will be described with reference to FIG. 5 in which the open / close valve 300 is fully opened and the mixed hot water having the target temperature TS is discharged. Here, in FIG. 5, the vertical axis shows the flow rate QC of the low temperature water, and the horizontal axis shows the flow rate QH of the high temperature water. The broken lines A1, A2 and A3 show the relationship between the flow rates of the low temperature water QC and the high temperature water QH, and the solid polygonal line indicates
The flow rates of low-temperature water and high-temperature water from the fully closed state of the on-off valve 300 to the target temperature TS are shown.

In this example, a case where the mixing ratio control number CT1 is three times, that is, a case where the set pressure PS of the pressure control valve 200 is switched over three times PS1, PS2 and PS3 will be described.

First, from the fully closed state, that is, from the state where low-temperature water and high-temperature water do not flow (a0), the flow rate control valve 100 is controlled to open, and low-temperature water is flowed by the flow rate ΔQCK (a1). At this time, since the set pressure PS of the pressure regulating valve 200 is set to PS1, the pressure regulating function of the pressure regulating valve 200 causes the flow rate of the high temperature water to be Δ.
Only QHK flows (b1). Then, the low-temperature water and the high-temperature water are mixed at a combined flow rate Q1 to discharge the mixed hot water.

Subsequently, when the set pressure PS of the pressure control valve 200 is switched to PS2 from the state of the flow rate Q1, and the flow rate QC of the flow rate control valve 100 increases by ΔQCK (a
2), hot water is increased by ΔQHK (b2). As a result, the mixed hot water having the flow rate Q2 is discharged. Similarly, the set pressure PS is switched to PS3, and low-temperature water and high-temperature water flow rate Δ
By increasing QCK and ΔQHK one by one, the fully open flow rate QM is reached.

After that, as described with reference to FIG. 3, the opening / closing control for the flow rate control valve 100 is executed, that is,
Feedback control is performed so as to reach the target temperature TS, and the flow rate QM (QHM,
At QCM), the mixed hot water having the target temperature TS is discharged.

Therefore, not only low-temperature water is discharged from the time when the opening / closing valve 300 is opened until the target temperature TS is reached, but mixed hot water having a temperature close to the target temperature TS is gradually discharged. It Therefore, when opening the on-off valve 300, there is no problem that low-temperature water whose temperature is not controlled spouts at the beginning.

In the above-described embodiment, the set pressure PS is gradually changed to discharge the mixed hot water having an appropriate temperature from the start of the water discharge. However, the set pressure PS is kept constant and the opening degree V of the opening / closing valve 300 is gradually changed. Even if the open control is performed, the temperature of the mixed hot water can be controlled in the same manner as in the above embodiment.

Next, as an example of the flow rate control valve 100 according to the hot water supply apparatus 1 of the above embodiment, a diaphragm type flow rate control valve which can be suitably implemented will be described. Figure 6
The flow rate control valve 100 shown in (1) includes a main valve mechanism 110 connected to the low temperature water side conduit 5C and a pilot valve mechanism 180 for controlling the main valve mechanism 110.

The main valve mechanism 110 includes a valve body 112 having a main flow passage 120. The main flow path 120 is
A primary side flow path 124 including an inflow port 122, and an outflow port 125
And a secondary side flow path 126 including
A main valve seat 114 for seating the main valve 130 is provided between the valve 24 and the secondary side flow passage 126.

The main valve 130 is the diaphragm 1 for the main valve.
33 and a main valve body 134 supported at the center of the main valve diaphragm 133. The main valve diaphragm 133 has a stepped portion 115 formed on the inner peripheral portion of the valve body 112 and a projecting end portion of the lid 140 that closes the upper opening 116 formed on the valve body 112 at the outer peripheral edge portion. 14
It is attached to the valve main body 112 by being sandwiched between the valve body 112 and the valve 1. The main valve 1 thus mounted on the valve body 112
The primary side flow passage 124 is partitioned by 30, and a part of the primary side flow passage 124 serves as a back pressure chamber 127.

The main valve element 134 has a base portion 135 composed of a collar portion 137 and a protrusion 138 protruding from the lower central portion thereof.
And a fastener 139 that is screwed onto the outer periphery of the protruding portion 138 of the base portion 135 and clamps the main valve diaphragm 133 between it and the lower surface of the collar portion 137.

A secondary diaphragm 150 is fixed to the tip of the tightening tool 139 of the main valve body 134 by means of a screw 153 at its central portion via a pressing member 151.
Further, the peripheral portion of the secondary side diaphragm 150 is
The valve body 11 is held by being clamped by a disc-shaped fastener 160 screwed to the step portion 118 of 12 and the lower opening 117.
It is attached to 2. This secondary diaphragm 150
Is arranged concentrically opposite to the main valve diaphragm 133 and has a pressure receiving area formed to have a diameter substantially equal to the seat diameter of the flow path opening of the main valve seat 114.

The primary flow path 12 of the flow control valve 100
4, the back pressure chamber 127 and the secondary side flow passage 126 are connected to each other by a small flow passage. That is, the main valve body 13
A small flow passage 170 that connects the primary-side flow passage 124 and the back pressure chamber 127 is formed in the outer peripheral portions of the base portion 135 and the main valve diaphragm 133 of FIG. In addition, a pilot passage 172 is formed in the protrusion 138 of the base portion 135 of the main valve body 134 at the center in the axial direction and further in the radial direction. The back pressure chamber 127 and the secondary side flow passage 126 are connected.

A pilot valve seat 182 is formed on the central upper surface of the main valve body 134 on the back pressure chamber 127 side of the pilot flow passage 172.

The pilot valve mechanism 180 controls the pressure of the back pressure chamber 127 by controlling the opening of the flow passage opening of the pilot valve seat 182. That is, the pilot valve mechanism 180 includes the stepping motor 190 housed in the casing 184 mounted on the top of the lid 140. This stepping motor 1
A drive shaft 191 of 90 is connected to a pilot valve body 196 via a slide mechanism 192 housed in a slide chamber 194 in a casing 184.

The slide mechanism 192 has a drive shaft 191.
A guide part (which is attached to the tip of the screw part 193 and has a thread formed on the outer peripheral part and a screw which is screwed into the screw of the screw part 193 on the inner peripheral part and which guides the outer peripheral part in the axial direction ( A slide member 195 (not shown) is provided, and the pilot valve body 196 that moves integrally with the slide member 195 is fixed to the tip of the slide member 195. A seat portion 197 made of rubber is formed at the tip of the pilot valve body 196, and the seat portion 197 is seated on the pilot valve seat 182.

A rubber bellows 198 is provided between the tip of the slide member 195 and the pilot valve body 196.
Of the bellows 198 is fixed to the valve body 112 side. The bellows 198 seal the back pressure chamber 127, the slide chamber 194, and the stepping motor 190 side. A diaphragm may be used instead of the bellows 198.

With such a configuration of the pilot valve mechanism 180, when the drive shaft 191 of the stepping motor 190 rotates in the forward or reverse direction, the screw portion 193 integral with the drive shaft 191.
Rotates in the slide member 195. The rotation of the screw portion 193 causes the slide member 195 to move back and forth in the axial direction. As the slide member 195 moves back and forth, the pilot valve body 19
6 moves in the closing or opening direction with respect to the pilot valve seat 182. As a result, the opening degree of the passage opening of the pilot valve seat 182 is changed.

Next, the operation of the flow rate control valve 100 having the pilot valve mechanism 180 for performing such an operation will be described. 6, in the flow rate control valve 100, the main valve body 134 supported by the main valve diaphragm 133 has the main flow path 1
By changing the opening with respect to 20, that is,
The flow rate of the main flow path 120 is adjusted by changing the opening degree of the main valve 130. The opening degree of the main valve 130 is a force applied to both surfaces of the main valve diaphragm 133 and the main valve body 134, that is, a force in the closing direction (downward direction) due to the pressure of the back pressure chamber 127 and the high temperature water flowing through the main flow path 120. It is determined by the balance with the force received from the opening direction (upward direction). Here, the force in the opening direction applied to the main valve 130 from the primary side flow passage 124 depends on the supply pressure of the primary side flow passage 124 and has a substantially constant value. Therefore, the opening degree of the main valve 130 is equal to the back pressure. Room 127
It is changed according to the closing force due to the pressure. The pressure of the back pressure chamber 127 is driven by the stepping motor 190 of the pilot valve mechanism 180 so that the pilot valve body 196 advances and retreats with respect to the pilot valve seat 182 via the slide mechanism 192, and the flow passage opening of the pilot valve seat 182. It is controlled by changing the opening degree for.

First, as shown in FIG. 6, from the state in which the pilot valve body 196 closes the flow passage opening of the pilot valve seat 182, the pilot valve body 196 is retracted to open the flow passage opening of the pilot valve seat 182. Then, the case where the flow rate of the main flow path 120 increases will be described.

Now, when a signal is sent from the electronic control unit 80 to the stepping motor 190 and the drive shaft 191 and the screw portion 193 rotate, the slide member 195 moves upward in the figure, and the pilot valve body 196 integral with this slides. When the pilot valve seat 182 is retracted from the valve seat 182, the opening of the flow passage opening of the pilot valve seat 182 increases. When the opening of the flow passage opening of the pilot valve seat 182 increases, the high temperature water in the back pressure chamber 127 flows into the secondary side flow passage 126 via the pilot flow passage 172, and the pressure in the back pressure chamber 127 decreases. As a result, the main valve 130 moves upward in the drawing to increase the opening of the flow passage opening of the main flow passage 120, and the flow rate of the main flow passage 120 increases.

When the main valve 130 moves upward in the drawing, the pilot valve seat 182 integrally provided with the main valve body 134 also moves to the pilot valve body 196 side, and the flow passage opening of the pilot valve seat 182 is opened. The opening becomes smaller. As a result, the flow rate from the back pressure chamber 127 to the secondary side flow passage 126 side through the pilot flow passage 172 decreases, and the pressure in the back pressure chamber 127 increases. Then, the main valve 130 is connected to the back pressure chamber 127.
At the position where the downward force due to the pressure of the above and the upward force due to the pressure of the primary side flow passage 124 are balanced, stop and maintain the opening degree. Therefore, the flow rate of the main flow passage 120 is determined by the opening degree of the main valve 130.

On the other hand, a case will be described in which the pilot valve body 196 is moved in the closing direction with respect to the flow passage opening of the pilot valve seat 182 to reduce the flow rate of the main flow passage 120. When the drive shaft 191 of the stepping motor 190 is driven in the opposite direction to the above, the operation of the slide mechanism 192 causes the pilot valve body 196 to advance to the pilot valve seat 182 side, and the opening degree of the flow passage opening of the pilot valve seat 182 increases. Get smaller. As a result, the flow rate from the back pressure chamber 127 to the secondary side flow passage 126 through the pilot flow passage 172 is reduced. On the other hand, since the high temperature water in the primary side flow passage 124 flows into the back pressure chamber 127 via the small flow passage 170, the back pressure chamber 127
Pressure rises. Therefore, the main valve 130 moves in the closing direction, and the flow rate of the main flow path 120 decreases.

Although the pressure in the secondary side flow passage 126 is applied to both the main valve diaphragm 133 and the secondary side diaphragm 150, the pressure receiving surfaces of the main valve diaphragm 133 and the secondary side diaphragm 150 are Since they are formed to face each other and have the same area, the pressure in the secondary side flow passage 126 is applied in the same direction in the opposite directions to the main valve diaphragm 133 and the secondary side diaphragm 150. On the other hand, the main valve diaphragm 133 and the secondary diaphragm 1
Since the valve 50 and the valve 50 are connected to each other by the protrusion 138 of the main valve body 134, the forces applied to the main valve diaphragm 133 and the secondary diaphragm 150 are offset. Therefore, even if the pressure in the secondary side flow passage 126 fluctuates, the main valve 130
Does not change.

According to the flow rate control valve 100, the rotational drive force of the drive shaft 191 of the stepping motor 190 can cause the slide valve 192 to move the pilot valve body 196 forward and backward with respect to the pilot valve seat 182 with a minute movement amount. it can. With such an adjusting function of the pilot valve mechanism 180 based on a minute movement amount, the main valve 130 can be adjusted within a minute opening range. Therefore, the flow control valve 10
When 0, the flow rate can be set in a fine range, and the hot water supply device 1 using the flow rate control valve 100 can control the mixing ratio with high accuracy.

Next, as an example of the pressure regulating valve 200 according to the hot water supply system 1 of the above embodiment, a pressure regulating valve having a pressure setting section 250 capable of varying the set pressure PS by a motor will be described.

In FIG. 7, the pressure control valve 200 includes a valve body 210 having a flow passage 220. Flow path 2
20 includes a primary-side flow path 224 including an inflow port 222 and a secondary-side flow path 226 including an outflow port 225. The valve body is provided between the primary-side flow path 224 and the secondary-side flow path 226. A valve seat 214 for seating 230 is provided.

The valve body 230 includes a diaphragm 233.
And a valve body portion 234 supported at the center of the diaphragm 233. The diaphragm 233 is
The outer peripheral edge portion is supported by the inner wall portion of the valve body 210. Further, the valve body portion 234 is the diaphragm 2
The support base 237 fixed to 33 and the support base 23
7, a support column portion 238 protruding from the lower end of the center, a support ring portion 239 fixed to the support portion 238, and the support portion 23.
8 and a valve section 240 provided at the lower end. The support ring portion 239 is the O-ring 23 held in the groove portion.
It is sealed by 9a and is slidably supported by the fitting support portion 215 of the valve body 210. Also, the valve unit 2
40 is the valve seat 21 due to the movement of the valve body portion 234 in the axial direction.
4 is configured to open or close the flow path 220 by being seated on or separated from.

On the other hand, the pressure setting section 250 has a stepping motor 260 housed in a casing 251. The drive shaft 26 of the stepping motor 260
1 cooperates to move the pressing plate 271 in the axial direction via the slide mechanism 270 housed in the slide chamber 263 in the casing 251. A spring 280 is provided between the lower surface of the pressing plate 271 and the diaphragm 233.
Has been erected.

Next, the operation of the pressure control valve 200 will be described. The opening degree of the valve body 230 is the diaphragm 2
33, the force applied to both surfaces of the valve body 234, that is, the force in the opening direction (downward direction) by the spring 280 and the force in the closing direction (upward direction) received from the pressure of the secondary side flow passage 226 are balanced. Determined.

That is, when the pressure in the secondary side flow passage 226 increases, that is, when the force received from the secondary side flow passage 226 with respect to the diaphragm 233 becomes larger than the downward force of the spring 280, the valve body 230 becomes Move upwards against the spring 280 to a balanced position. At this time, the valve body 230
The valve section 240 integrated with the valve moves to the valve seat 214 side to reduce the opening degree and reduce the flow rate of the flow path 220. On the contrary, the pressure of the secondary side flow path 22 decreases, that is, the diaphragm 2
The force received from the secondary side flow path 226 with respect to 33 is the spring 28.
When the force is smaller than 0 downward force, the valve body 230
Moves to a lower position where they are balanced by the biasing force of the spring 280. At this time, the valve portion 240 integrated with the valve body 230
Is separated from the valve seat 214, and its opening is increased to increase the flow path 2
The flow rate of 20 increases.

That is, the pressure control valve 200 changes the flow rate of the flow passage 220 by increasing or decreasing the opening degree of the valve body 230 so as to maintain the pressure of the secondary flow passage 226 at the set pressure PS. ..

The set pressure PS can be changed by the spring 280 of the pressure setting section 250 by driving the stepping motor 260. That is, when the drive shaft 261 of the stepping motor 260 rotates forward or backward,
The pressing plate 271 can be moved via the slide mechanism 270 to move the spring 280 in the axial direction, whereby the spring force applied to the diaphragm 233 can be adjusted.

The present invention is not limited to the above embodiments, but can be carried out in various modes without departing from the scope of the invention, and the following modifications can be made.

(1) Although the pressure control valve 200 has a pressure setting section capable of changing the set pressure by driving the motor, the present invention is not limited to this, and an operating section capable of changing the spring force by a manual operation. It may be configured to have a pressure setting unit having.

(2) In the above embodiment, the check valve is used as a means for preventing backflow in the low temperature water side conduit and the high temperature water side conduit, but the invention is not limited to this, and the diaphragm type shown in FIG. This can be omitted in a flow control valve having a fully closed mechanism such as a flow control valve, and an on-off valve may be used instead of the check valve. The on-off valve 300 provided in the mixing conduit 5M may be a manual on-off valve or a flow control valve in addition to the electromagnetic on-off valve. In any case, the mixing from the mixing conduit 5M is performed. Any means capable of stopping the hot water or adjusting the flow rate may be used.

(3) In the above embodiment, the feedback control for controlling the flow rate of the flow rate control valve 100 is performed by the temperature sensor 50 provided in the mixing pipe 5M, but the present invention is not limited to this, and various change amounts are used. , Feedforward control may be added, or feedforward control may be performed independently. That is, the temperature and the flow rate of the low temperature water passing through the flow rate control valve 100 and the high temperature water passing through the pressure control valve 200 may be measured, and the flow rate control valve may be feed forward controlled using the measured variation. According to this control, the responsiveness can be accelerated. In the feedforward control, the flow rate of the mixed hot water is constant, and if the flow rate of one pipeline is determined, the flow rate of the other pipeline is determined. Therefore, if necessary, measurement of one flow rate is omitted. can do.

[0071]

As described above, according to the first aspect of the present invention.
According to the above liquid mixing apparatus, when controlling the mixing ratio of the first fluid and the second fluid to the target mixing ratio, it can be performed only by controlling the flow rate of one flow rate adjusting valve. Easy to control.

According to the second aspect of the present invention, the first liquid and the second liquid are mixed by using the same type of liquid and adjusting the temperature of the mixed liquid only by controlling the flow rate of the flow rate adjusting valve. Since the temperature of the liquid can be adjusted, temperature control of the mixed liquid becomes easy.

Further, in the inventions of claims 3 and 4, in addition to the control of the mixing ratio of the mixed liquid by the effect of claim 1 or 2, the flow rate of the mixed liquid can be changed with a simple structure.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a hot water supply device according to an embodiment of the present invention.

FIG. 2 is a graph showing the relationship between the flow rates of low-temperature water and high-temperature water in the water heater according to the embodiment.

FIG. 3 is a flowchart showing a mixed hot water control process of the embodiment.

FIG. 4 is a flowchart showing a mixed hot water control process of the embodiment.

FIG. 5 is a graph showing the relationship between the flow rates of low-temperature water and high-temperature water in the hot water supply apparatus according to the embodiment.

FIG. 6 is a sectional view showing a flow rate control valve used in the embodiment.

FIG. 7 is a sectional view showing a pressure control valve used in the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Hot water supply apparatus 5C ... Low temperature water side pipeline 5H ... High temperature water side pipeline 5M ... Mixing pipeline 10 ... First check valve 20 ... Second check valve 50 ... Temperature sensor 60 ... Target temperature setter 80 ... Electronic Control device 100 ... Flow control valve 100M ... Control unit 180 ... Pilot valve mechanism 200 ... Pressure control valve 200M ... Control unit 260 ... Stepping motor 250 ... Pressure setting unit 280 ... Spring 300 ... Open / close valve

Claims (4)

[Claims] 1. A liquid mixture for mixing a first liquid flowing through a first pipeline and a second liquid flowing through a second pipeline and discharging the mixed mixed liquid through a mixing pipeline. In the mixing device, a flow rate control valve that is provided in one of the first pipeline and the second pipeline and has a drive unit that changes the flow rate of the liquid by an electrical drive signal; A pressure control valve which is provided in the other of the pipelines and regulates the pressure on the downstream side of the pipeline toward the set pressure, and a target mixing ratio of the first liquid and the second liquid is set. According to the target mixing ratio setting means and the target mixing ratio set by the target mixing ratio setting means, the flow rate of the liquid flowing through the flow rate adjusting valve is adjusted by sending a control signal to the drive unit of the flow rate adjusting valve. A liquid mixing apparatus comprising: a flow rate control means; 2. A high temperature liquid flowing through the first conduit, and a second liquid
A liquid mixing device that mixes a high-temperature liquid with a low-temperature liquid of the same type as the above-mentioned high-temperature liquid and lower than the high-temperature liquid, and discharges the mixed liquid through the mixing pipe. And a second flow path, the flow rate control valve having a drive section for changing the flow rate by an electric drive signal, and the other of the two flow paths. A pressure control valve for adjusting the pressure on the downstream side of the pipeline toward the set pressure, a target temperature setting means for setting the target temperature of the mixed liquid, and a target temperature set by the target temperature setting means. Accordingly, a liquid mixing apparatus comprising: a flow rate control unit that adjusts the flow rate of the liquid flowing through the flow rate adjusting valve by sending a control signal to the drive unit of the flow rate adjusting valve. 3. The liquid mixing apparatus according to claim 1, wherein the pressure control valve has a pressure setting unit capable of changing the set pressure. 4. The pressure setting section of the pressure control valve has a drive section for changing the set pressure by an electric drive signal, and a liquid mixture flow rate setting means for setting a target flow rate of the liquid mixture, and the liquid mixture. The liquid mixing apparatus according to claim 3, further comprising: a flow rate control unit that controls the set pressure by sending a control signal to a drive unit of the pressure control valve according to the target flow rate set by the flow rate setting unit. ..