JPH0241509A - Cascade type temperature controller - Google Patents

Abstract

PURPOSE:To agreeably take a shower of a stable hot water temperature by executing roughly a temperature control by mixing water and hot water by a one-stage side motor operated valve, mixing water again to mixed hot water of a stable temperature by a two-stage side motor operated valve, and executing precisely and exactly a temperature control. CONSTITUTION:A one-stage side geared motor 10 is controlled by a one-stage side temperature sensor 11 provided on a duct line 41 connected to a mixing gate 7, and mixed hot water discharged from the mixing gate 7 is led into a gate 39 of a three-wave valve 27 of a two-stage side motor operated valve 26. Subsequently, water is led into a water port 28 of the three-wave valve 27, and from a mixing gate 30 of the three-wave valve 27, mixed hot water is discharged, and opening and closing of the three-way valve 27 are executed by a two-stage side geared motor 31. Also, the two-stage side geared motor 31 is controlled by a two-stage side temperature sensor 32 provided on a secondary duct line 42 connected to the mixing gate 30 of the three-way valve 27. In such a way, a shower of a stable hot water temperature is offered.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cascade type temperature yA regulating device for adjusting the temperature of hot water for showering during bathing, washing hands, etc.

Prior Art A prior art example is JP-A-61-106155. This publication discloses a mixing valve as a member for mixing hot water in a hot water injection control system.

Problem to be solved by the invention JP-A-61-'106155 exemplified as a conventional technique
In the technology shown in this issue, hot water is mixed by rotating a rotary valve of a mixing valve.

This technology involves rotating a rotary valve to gradually increase the water temperature from low to high. Therefore, it has been impossible to quickly rotate the rotary valve in an appropriate direction to ensure a stable supply of hot water at a constant temperature.

In addition, as a mechanism used to maintain a constant water temperature,
A coiled bimetal built into the mixing valve.
Rotating the valve body, which is a cylinder with multiple holes in the side,
Some have a structure in which this hole changes the opening area of the cylindrical sprue and water spout. With this structure, the amount of hot water and water flowing into the mixing chamber provided in the housing that constitutes the mixing valve is adjusted and mixed by a valve body, and the temperature of the hot water in the mixing chamber is adjusted to the temperature indicated by the scale of the mixing valve. I try to keep it at the same temperature.

In the above-mentioned mixing valve, the temperature detecting member is bimetallic, so even if the hot water source temperature fluctuates, if the temperature difference between the mixing valve set temperature and the mixing temperature is small, the bimetal deformation will be small, and the friction of the valve body will increase. Unable to follow temperature due to backlash etc. As a result, the accuracy of temperature control of the mixed hot water is poor.
The disadvantage is that the temperature of the mixed hot water is unstable due to fluctuations in hot water temperature and pressure.

In addition, since the cylindrical valve body is rotated by a coiled bimetal, there is a limit to the driving force of the bimetal itself, and dust may adhere to the cylinder, making it difficult to rotate sufficiently. Furthermore, the cylinder may not move at all due to dust. Also.

The drawback is that the cylindrical sprue and water spout are prone to clogging and other malfunctions, and that it requires a lot of maintenance work.

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the drawbacks of the prior art and to provide a cascade-type hot water temperature control device that provides a desired precise and stable temperature mixed hot water.

That is, in the present invention, the first-stage motor valve 2 has a water spout 4 for receiving water, a sprue 5 for receiving hot water, and a mixing sprue 7 for discharging mixed hot water.
and a first-stage geared motor 10 that opens and closes the three-way valve 3, and a first-stage temperature sensor 11 is provided in a pipe 41 connected to the mixing gate 7. The first-stage geared motor 10 is controlled by the detection signal, and the mixed hot water discharged from the mixing sprue 7 is introduced into the sprue 39 of the three-way valve 27 of the second-stage motor valve 26 . The water is introduced into the water port 28, and the mixed hot water is discharged from the mixing sprue 30 of the three-way valve 27. The three-way valve 27 is opened and closed by a two-stage geared motor 31. This is a cascade type temperature control device in which a second stage side temperature sensor 32 is provided in a secondary pipe line 42 connected to the second stage side temperature sensor 30, and a second stage side geared motor 31 is controlled by a detection signal obtained from the second stage side temperature sensor 32.

Example Embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 shows the piping system and electrical configuration of the device. Hot water and water prepared in the existing equipment are respectively connected to the first-stage motor valve 2 through piping and taken in.

The first-stage motor valve 2 has a three-way valve 3, and a water inlet 4 of the three-way valve 3 receives water via a water check valve 1, and a sprue 5.
Hot water is obtained through the hot water check valve 6.

Mixed hot water is discharged from the mixing sprue 7 of the three-way valve 3, and the shaft core 9 of the valve body 8 of the three-way valve 3 shown in FIG. 2 is directly connected to the first-stage geared motor 10.

Next, the electrical configuration for controlling the first-stage motor valve 2 will be described. The mixing sprue 7 of the first-stage motor valve 2 is provided with a first-stage temperature sensor 11 that is a thermocouple and detects the temperature. The sensor 11 is connected to the first-stage detection section 12 .

The first stage side detection unit 12 receives a signal corresponding to the mixed water temperature generated by the semi-fixed temperature setting device 13 and generates a reference voltage based on the signal, and a signal obtained from the first stage side temperature sensor 11. and a comparison circuit 16 that compares the output signal of the reference voltage generation circuit 14 and the output signal of the sensor amplifier circuit 15.

The first-stage motor drive section 17 includes an amplifier circuit 18 that amplifies the output signal of the comparison circuit 16 and an absolute value circuit 19 that takes in only the magnitude of the output signal of the amplifier circuit 18. Two outputs are output from the absolute value circuit 19. One of the two outputs is connected to a V-F conversion circuit 20 that generates a frequency proportional to the magnitude of the voltage, and the other of the two outputs is a motor rotation direction indicating circuit that indicates the rotation direction of the first-stage geared motor 10. 2
Connected to 1. The V-F conversion circuit 20 is attached with a frequency setting knob 22 that determines the maximum frequency, and the output of the V-F conversion circuit 20, that is, the pulse rising signal, has a pulse width set by the pulse width setting knob 23. It is connected to the output pulse width setting circuit 24. Pulse width setting circuit 24
The output signal of the motor rotation direction indicating circuit 21 and the output signal of the motor rotation direction indicating circuit 21 are connected to a motor valve drive circuit 25 that controls the first stage motor valve 2, and the output of the motor valve drive circuit 25 is connected to the first stage gear Connected to motor 10.

Next, the configuration regarding the second-stage motor valve 26 will be described.

Water prepared in existing equipment and first-stage motor valve 2
The mixed hot water coming out of the mixing sprue 7 is connected to the second stage side motor valve 2.
6 is connected by piping. The second-stage motor valve 26 has a three-way valve 27. The water is supplied to the water port 28 of the three-way valve 27 via a water pressure reducing valve 29 that limits the upper limit pressure to a predetermined pressure, and the water is obtained from the sprue 5. Obtain the above mixed hot water. Mixed hot water (hereinafter referred to as secondary mixed hot water) is discharged from the mixing sprue 30 of the three-way valve 27, and the axis (not shown) of the valve body (not shown) is directly connected to the second-stage geared motor 31.

Next, the electrical configuration for controlling the second-stage motor valve 26 will be described.

A second-stage temperature sensor 32 made of a thermocouple is provided at the mixing sprue 30 of the second-stage motor valve 26, and a second-stage temperature sensor 32 that sets the signal of the second-stage temperature sensor 32 and the temperature of the secondary mixed hot water to a desired temperature. The signal from the side temperature setting device 33 is connected to the second stage side detection section 34.

The second-stage detection section 34 has the same configuration as the first-stage detection section 12, so a description thereof will be omitted. The output of the second-stage detection section 34 is connected to the second-stage motor drive section 35 . The second-stage motor driving section 35 also has the same configuration as the first-stage motor II moving section 17, so a description thereof will be omitted.

The output of the second-stage motor drive unit 35 is connected to the second-stage geared motor 31 that constitutes the second-stage motor valve 26 .

Mixing gate 30 of three-way valve 27 of second-stage motor valve 26
A water stop valve 36 is provided in the middle of the secondary pipe 42 connected to the
Furthermore, a shower nozzle 37 is provided at the end of the extension pipe of the water stop valve 36.

In addition, 38 shown in FIG. 1 is a first-stage side motor valve control part that controls the first-stage side motor valve 2, 39 is a sprue of the three-way valve 27 of the second-stage side motor valve 26, and 40 is a sprue for the second-stage side motor valve 26. 41 is a pipe line connected to the mixing sprue 7 of the three-way valve 3 of the first-stage motor valve 2, and 43 is a check valve.

Function The function of supplying hot water at an appropriate temperature to a bath shower using the cascade type temperature control device of the present invention will be described below.

Water to be supplied to the apparatus of the present invention is introduced into the water port 4 of the motor valve 2 on the first stage side, and hot water is introduced into the sprue 5 of the motor valve 2 on the first stage side. In the first-stage motor valve 2, both the water flowing from the water spout 4 and the hot water flowing from the sprue 5 are passed through simultaneously to the mixing sprue 7, and the mixed hot water is taken out from the mixing sprue 7. The temperature of the mixed hot water is detected by the first-stage temperature sensor 11 located in the hole of the conduit 41 connected to the mixing sprue 7, and the detected signal is input to the first-stage motor valve control section 38.

The hind leg signal, which has been subjected to predetermined electrical processing by the first-stage motor valve control section 38, is fed back to the first-stage motor valve 2.

First-stage temperature sensor 11, first-stage motor valve control section 3
8 and the first-stage motor valve 2 are used to feedback-control the temperature of the mixed hot water.

Next, the operation of the first stage side detection section 12 will be described.

When a predetermined temperature is set by the first-stage temperature setter 13, a predetermined reference voltage corresponding to the set temperature is applied from the temperature setter 13 to the reference voltage generation circuit 14.

The comparison circuit 16 compares the reference voltage generated in the reference voltage generation circuit 14 according to the applied voltage with the voltage detected by the first-stage temperature sensor 11 and amplified by the sensor amplifier circuit 15, and calculates the difference between the reference voltage and the detected voltage. The voltage is output from the comparator circuit 16.

Next, the operation of the first-stage motor drive section 17 will be described.

The voltage obtained from the comparator circuit 16 is amplified by the amplifier circuit 18, and in the absolute value circuit 19, if the input signal obtained from the amplifier circuit 18 has a positive potential, it is sent as is to the next stage; if it is a negative potential, the signal is inverted and sent to the next stage. The motor rotation direction indicating circuit 21 detects whether the potential is positive or negative, and if the potential is positive, the geared motor 1 on the first stage side
Create a signal that rotates 0 forward and reverses if it is negative.

The V-F conversion circuit 2o generates a signal with a frequency proportional to the magnitude of the signal obtained from the absolute value circuit 19, and the pulse width setting circuit 24 generates a rectangular pulse with a variable pulse width in synchronization with the rise of the frequency signal. let

The motor valve drive circuit 25 receives the output of the motor rotation direction indicating circuit 21 and the output of the pulse width setting circuit 24 to operate the first-stage geared motor 10.

Regarding the frequency and period of the voltage applied to the single-stage geared motor 10, the larger the output voltage from the comparator circuit 16, the more the total energization period of the first-stage geared motor 10 increases as shown in FIG. It rotates, and the number of rotations within a certain period of time is large. Conversely, the smaller the output voltage from the comparator circuit 16 is, the smaller the total energization period of the first-stage geared motor is, as shown in FIG. There are few. Further, when the output voltage from the comparison circuit 16 is zero, no voltage is applied to the first-stage geared motor 10 and it does not rotate.

The frequency of the V-F conversion circuit 20 is set using the frequency setting knob 22. If the frequency is lowered, the number of pulses will decrease, and the total voltage energization period to the first-stage geared motor 10 will be reduced, resulting in a slower response speed.If the frequency is increased, the number of pulses will increase, and the total voltage application period to the first-stage geared motor 10 will be slower. The voltage application period increases and the response speed becomes faster.

When the pulse width setting knob 23 of the pulse width setting circuit 24 is turned to widen the pulse width, the voltage application period of one pulse to the first stage geared motor 10 becomes longer, and the accuracy and resolution of the response of the first stage motor valve 2 deteriorates. Conversely, if the pulse width is narrowed, the voltage application period of one pulse to the first-stage geared motor 10 will be shortened, and the accuracy and resolution of the response of the first-stage motor valve 2 will be improved.

In controlling the first-stage motor valve 2, by lowering the frequency and widening the pulse width, the total number of rotations of the first-stage geared motor 10 that rotates with the -pulse is increased, and the response of the first-stage motor valve 2 is increased. Increase speed and make quick and coarse temperature adjustments. In this case, the resolution of the response deteriorates, but the first-stage motor valve 2 compensates for this deterioration in resolution by setting the frequency lower.

Next, the effect of the first-stage motor valve 2 on water pressure fluctuations in the water source and hot water temperature fluctuations will be described.

When the supply pressure from the water source changes significantly from normal pressure to zero or near zero, a large difference occurs between the reference voltage and the voltage detected by the first-stage temperature sensor 11. Because this potential difference is large, the frequency of the pulse output from the pulse width setting circuit 24 becomes high, and the energization period of the first-stage geared motor 10 becomes dense, so that the first-stage geared motor 10 quickly closes the sprue 5 of the first-stage motor valve 2. Motor 10 is activated.

Even when the supply pressure from the hot water temperature changes greatly from normal pressure to zero or near zero, the control system operates in the same manner as described above, and quickly moves the first-stage geared motor 10. However, the signal from the motor rotation direction indicating circuit 21 is different, and the rotation direction of the first-stage geared motor 10 is opposite to that when the water pressure decreases, and the water port 4 of the first-stage motor valve 2 is operated to close. do.

When the fluctuations in water pressure and hot water pressure are slight, the difference between the reference voltage and the detected voltage is small, and therefore the frequency of the pulses output from the pulse width setting circuit 24 is low and the energization period of the first-stage geared motor 10 is sparse. First stage motor valve 2
operates slowly.

Next, we will describe the temperature adjustment effect of this device in response to changes in the water temperature of the water source and changes in the water temperature.

When the water temperature or hot water temperature decreases and the detected temperature of the mixed hot water is lower than the set temperature semi-fixed by the first-stage temperature setting device 13, the opening degree of the sprue 5 of the first-stage motor valve 2 increases. The valve body 8 operates to reduce the opening degree. Further, when the water temperature or hot water temperature rises and the detected temperature of the mixed hot water is higher than the set temperature, the valve body 8 is operated so that the opening degree of the water inlet 4 of the first-stage motor valve 2 increases and the opening degree of the sprue mouth 5 decreases.

Next, the control of the second-stage motor valve 26 will be described in detail.

The water existing in the facility is introduced into the water port 28 of the second-stage motor valve 26, and the mixed hot water produced by the first-stage motor valve 2 is introduced into the sprue 39 of the second-stage motor valve 26. At the second-stage motor valve 26, both the water flowing from the water spout 28 and the mixed hot water flowing from the sprue 39 are passed through simultaneously to the mixing sprue 30, and new mixed hot water, that is, secondary mixed hot water is taken out from the mixing sprue 30. . The second-stage temperature sensor 32 located in the hole of the secondary pipe line 42 connected to the mixing sprue 30 detects the temperature of the secondary mixed hot water, and the detected signal is input to the second-stage motor valve control section 40 . After performing predetermined electrical processing in the second-stage motor valve control section 4o, the signal is fed back to the second-stage motor valve 26. Second-stage temperature sensor 32.
The temperature of the secondary mixed hot water is feedback-controlled using the second-stage motor valve control section 40 and the second-stage motor valve 26.

When a desired temperature is arbitrarily set using the second-stage temperature setting device 33, the second-stage detection section 34 receives the signal from the second-stage temperature setting device 33 and the signal detected by the second-stage temperature sensor 32. A comparison signal is generated, and this comparison signal is transmitted to the second stage side motor drive section 35.
Based on this comparison signal, the second stage side motor drive section 3
5 operates the second stage side motor valve 26. The operation of the second-stage side detection section 34 is similar to the operation of the first-stage side detection section 12, so a description thereof will be omitted. In addition, the second stage side motor movement part 35
The action of is similar to that of the first-stage motor drive section 17, so a description thereof will be omitted.

However, the frequency setting knob 2 of the first-stage motor drive section 17
2. Pulse width setting knob 23. Second stage side motor drive section 3
The frequency setting knob (not shown) and the pulse width setting knob (not shown) are set as follows.

The original waveform of the voltage applied to the first-stage geared motor 10 in the first-stage motor driving section 17 is as shown in FIG. 4, with the frequency set low and the pulse width set wide. The total number of rotations of the geared motor 10 is increased to increase the response speed of the first-stage motor valve 2. In this case, the resolution of the response is poor, but the first-stage motor valve 2 compensates for this deterioration in resolution by setting the frequency lower. The first-stage motor valve 2 performs quick and coarse temperature control.

The original waveform of the voltage applied to the second-stage geared motor 31 in the second-stage motor drive section 35 is shown in FIG. The width is set narrow. In this case, the response speed of the second-stage motor valve 26 decreases, so the frequency is set high to prevent this decrease. The second-stage motor valve 26 performs fine and accurate temperature control.

Effects of the Invention The present invention mixes hot water and water using a motor valve on the first stage, and further connects the mixing spout of the motor valve on the first stage with the sprue of the motor valve on the second stage, and mixes the mixed hot water with the motor valve on the second stage. Since the structure is such that water is mixed with the water again, the mixed hot water is made twice, and the temperature of the mixed hot water is controlled twice.

In the above configuration, even if the hot water temperature, water temperature, hot water pressure, and water pressure of the supply source fluctuate, the first-stage motor valve mixes the water and sae to coarsely control the temperature, absorbing large temperature and pressure fluctuations, and producing hot water. The temperature is quickly stabilized, and the second-stage motor valve remixes water into the mixed hot water at the stable temperature to precisely and precisely control the temperature. Furthermore, the first-stage motor valve and the second-stage motor valve operate at the same time.

The temperature of the hot water used does not fluctuate much, and the mixed hot water quickly reaches the set temperature and settles down. Therefore, you can comfortably take a shower with stable water temperature.

In addition, since the system uses a mixture of hot water made by adding water to -temperature hot water to create a secondary mixed hot water at an appropriate temperature, the risk of hot water being discharged due to equipment malfunction is extremely low. You can use hot water with peace of mind.

In particular, a caregiver uses a shower when bathing a bedridden elderly person, so it is necessary to check each time it is used, which increases the labor of the caregiver. There were cases where people suffered burns due to the ascent, and the danger was high. However, by using the present invention, accidents such as the aforementioned burns can be prevented, and hot water can be used with peace of mind.

[Brief explanation of the drawing]

The attached drawings show an embodiment of the present invention, in which Fig. 1 is a block diagram of the piping system and electrical components, Fig. 2 is a sectional view of the three-way valve of the first stage motor valve, and Fig. 3 is the first stage side motor valve. A block diagram of the motor valve control unit. Figures 4 and 5 are diagrams of the output waveform of the pulse width setting circuit of the first stage motor drive unit. Figure 6 is the output waveform of the pulse # setting circuit of the second stage motor drive unit. Figure 7 is a diagram showing the hot water temperature at the source of threat, Figure 8 is a diagram of the output waveform of the pulse width setting circuit of the first stage motor drive section,
Figure 9 is a diagram showing the temperature of mixed hot water obtained from the mixing sprue of the three-way valve of the first-stage motor valve, Figure 10 is a diagram of the output waveform of the pulse width setting circuit of the second-stage motor drive section, and Figure 11 is a diagram showing the temperature of secondary mixed hot water obtained from the mixing sprue of the three-way valve of the second-stage motor valve.

Claims (1)

[Claims] The first-stage motor valve 2 consists of a three-way valve 3 having a water inlet 4 for receiving water, a sprue 5 for receiving hot water, and a mixing sprue 7 for discharging mixed hot water, and a first-stage geared motor 10 for opening and closing the three-way valve 3. A first-stage temperature sensor 11 is provided in the conduit 41 connected to the mixing sprue 7, and the first-stage geared motor 10 is controlled by the detection signal obtained by the first-stage temperature sensor 11, and the sprue of the three-way valve 27 of the second-stage motor valve 26 is controlled. 39, the mixed hot water discharged from the mixing sprue 7 is introduced, and the water is introduced into the water port 28 of the three-way valve 27 of the second-stage motor valve 26,
Mixed hot water is discharged from the mixing sprue 30 of the three-way valve 27, and the opening and closing of the three-way valve 27 is performed by a second-stage geared motor 31. This is a cascade type temperature control device in which a stage-side temperature sensor 32 is provided and a second-stage geared motor 31 is controlled by a detection signal obtained by the second-stage temperature sensor 32.