KR920003111B1 - Automatic water suppying device - Google Patents

Abstract

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Description

Automatic water supply system and control method

1 is a block diagram of an automatic water supply device of the present invention.

2 is an electric circuit diagram showing a motor detecting means of this automatic water supply device.

3 is an electric circuit diagram showing instruction control of this automatic water supply device.

4 is a pump characteristic diagram of this automatic water supply system.

5 is a flowchart showing the main routine of the control method of the automatic water supply device.

6 is a flowchart showing movable subroutines in the main routine.

7 is a flowchart showing the parallel control routine in this main routine.

8 is a time chart diagram showing an operation state of this automatic water supply device.

9 is a pump characteristic diagram explaining the change of the pump rotation speed of this automatic water supply device.

10 is a characteristic diagram of parallel operation control power of this pump characteristic.

11 is a block diagram of a conventional automatic water supply device.

12 is a pump characteristic diagram of a conventional automatic water supply device.

* Explanation of symbols for main parts of the drawings

1: Pump 1a: Motor

6a: Faucet 7: Pressure switch (pressure detection means)

8 pressure tank 9 control unit

10: power detection unit (motor detection means) 11: indicating control unit

11a: operation number 11b: comparison unit

11c: positioning unit

The present invention relates to an automatic water supply device and a control method thereof, and more particularly, to an automatic water supply device in which a pump is connected in parallel.

In the conventional automatic water supply system of this type, as shown in FIG. 11, the pump 1 'having the motor 1a' is connected in parallel, and the pressure tank 8 'is connected to the discharge side of the pump 1'. Is connected to the pump 1 ', and a pressure switch 7' is provided on the discharge side of the pump 1 ', and the control unit controls the start or stop of the pump 1' by receiving a signal from the pressure switch 7 '. (9 ') is provided.

The operation of this automatic water supply device will be described with reference to FIG. 12 shows the characteristic diagram of the pump, and shows the water supply Q on the horizontal side and the pressure H on the vertical axis. H ₁ represents the water supply rate-pressure curve for the single operation of the pump 1 '.

H ' ₁ represents the water supply-pressure curve of the parallel operation of the pump 1'. R ' ₁ and r ₁ ′ represent the load curve of the pump 1.

(H₁의 c'점)이 되면 2호펌프(1')도 뒤따라 운전한다. 펌프(1)의 병렬운전은 그 부하곡선 R₁'과 급수량-압력곡선 H₁'과의 교차점 d'에서 운전하게 된다. 이 상태에서 수도꼭지(6a')로부터의 급수량 Q이 감소하여 병렬운전해제압력

이 되면, 한쪽의 펌프(1')의 운전이 정지되어 단독운전이 된다(H₁의 f'점). 그리고, 이 종류의 장치로서 관련되는 것으로서 예를 들면 일본국 특허출원공고 제1984-720호 공보를 들 수 있다."The faucet (6a from the stationary pump (1), on both sides of the water supply is started on)," to the pressure in the reduced (a of H ₁ Single operation start pressure Pon pressure tank 8, when a point), the pressure The switch 7 'is closed and the No. 1 pump 1' is operated alone. After the operation, when the water supply decreases and the pressure H ₁ rises to reach the standstill operation stop pressure P _off (b 'point of H ₁ ), the No. 1 pump 1' is stopped. After the operation of the No. 1 pump 1 ', the water supply increases, and the pressure H ₁ decreases, so that the motor 1a' of the No. 1 pump 1 'runs in parallel operation starting pressure.

Figure operation followed, when No. 2 pump (1, a (points) c H in ₁₎ ". The parallel operation of the pump 1 is operated at the intersection d 'between the load curve R ₁ ′ and the water supply-pressure curve H ₁ ′. In this state, the water supply Q from the faucet 6a 'decreases and the parallel operation release pressure is reduced.

In this case, the operation of one of the pumps 1 'is stopped to become independent operation (f' point of H ₁ ). As related apparatuses of this kind, for example, Japanese Patent Application Publication No. 1984-720 can be given.

까지 저하하면, 펌프(1')가 병렬운전을 개시하지만, 실제로는 병렬운전을 할 정도의 급수량을 필요로 하고 있지 않으므로, 곧 병렬운전해제압력

에 달하여 펌프(1')의 한쪽이 정지하고, 단독운전이 된다. 이 단독운전으로 급수량이 그대로이면, 재차 압력저하가 발생하여, 추종펌프(1')가 운전된다. 이것이 반복되어서 채터링현상이 발생한다.The conventional automatic water supply device and its control method detect the discharge side pressure of the pump 1 'with the pressure switch 7', and control the parallel operation by this pressure switch 7 '. High control was not possible. That is, the discharge side pressure of the pump 1 'may not be able to follow the actual amount of water supply immediately after the pump 1' is started to operate, and may involve a temporary decrease. In particular, when the pressure tank 8 'is downsized, such a temporary pressure drop is likely to occur. Starting pressure for parallel operation due to temporary pressure drop

When the pump 1 'is lowered, the pump 1' starts parallel operation. However, since the pump 1 'does not actually need a water supply enough to perform parallel operation, the parallel operation release pressure soon.

As a result, one of the pumps 1 'stops, and single operation is performed. If the water supply amount remains the same in this single operation, the pressure decreases again, and the following pump 1 'is operated. This is repeated and chattering occurs.

In this automatic water supply system, no consideration has been given to making the operation time of the pump 1 'uniform when the parallel operation and the single operation of the pump 1' are repeated.

In addition, such an automatic water supply device has a problem that the rotation speed changes due to voltage fluctuations applied to the pump 1 ', and thus the water supply amount changes.

A first means of the present invention is to connect a pump with a motor in parallel and to connect a pressure tank to the discharge side of the pump; An automatic water supply device comprising a control unit for providing a pressure detecting means on the discharge side of the pump and receiving a signal from the pressure detecting means to control the operation of the pump, wherein the motor detecting means for detecting the operation state of the motor is provided. And a calculating section that calculates the parallel operation control value by calculating the signal from the motor detecting means immediately after starting the pump alone, and compares the signal from the motor detecting means with the parallel operation control value. Comparing unit for controlling parallel operation is provided in the control unit is characterized in that the automatic water supply device.

The second means of the present invention is a pump connected in parallel with a motor, a pressure tank connected to the discharge side of the pump, a pressure detection means provided on the discharge side of the pump, and a motor detection for detecting the operation state of the motor. Means and a control unit for receiving a signal from the pressure detecting means and controlling the operation of the pump, and starting the sole operation of the pump by the signal from the pressure detecting means, and then detecting the motor immediately thereafter. The parallel operation control value is calculated by the signal from the means, and then the parallel operation of the pump is started when the signal from the motor detection means is always compared with the parallel operation control value and becomes a predetermined signal. It is to control the automatic water supply system.

The third means of the present invention comprises a pump connected in parallel with a motor, a pressure tank connected to the discharge side of the pump, pressure detecting means provided on the discharge side of the pump, and receiving a signal from the pressure detecting means. An automatic water supply device having a control unit for controlling the operation of a pump, comprising: a motor detecting means for detecting an operation state of the motor, and calculating by a signal from the motor detecting means immediately after starting the pump alone. An arithmetic unit for creating a parallel operation control value, a comparison unit for controlling parallel operation of the pump by comparing the signal from the motor detecting means with the parallel operation control value, and when repeating the independent operation and the parallel operation of the pump. The automatic water supply device characterized in that the control unit is provided with a positioning unit for controlling the pump to be operated alone to alternate. A.

A fourth means of the present invention includes a pump connected in parallel with a motor, a pressure tank connected to the discharge side of the pump, a pressure detecting means provided on the discharge side of the pump, and receiving a signal from the pressure detecting means. An automatic water supply device having a control unit for controlling the operation of a pump, comprising: a motor detecting means for detecting a driving state of the motor, calculated by a signal from the motor detecting means immediately after starting the pump alone An automatic water supply device, comprising: a calculation unit for preparing a parallel operation control value having a constant water supply amount; and a comparison unit for controlling parallel operation of the pump by comparing a signal from the motor detection means with the parallel operation control value. It is done.

According to such an automatic water supply device and a control method thereof, the signal from the motor detection means corresponding to the water supply amount with high accuracy compared to the pressure becomes a starvation signal, and the parallel operation control value calculated from the signal from this motor detection means is further increased. Can be set in correspondence with the water supply amount irrespective of the pressure on the discharge side. This makes it possible to control the parallel operation with high accuracy and reliably in response to the water supply amount. Even if the pressure tank is miniaturized and a pressure drop temporarily occurs that does not correspond to the water supply, parallel operation of the pumps is not started.

In addition, according to such an automatic water supply device, since the pumps in each single operation are alternately operated when the parallel operation and the single operation of the pumps are repeated, the operation time and the number of operation of each pump can be made uniform.

According to such an automatic water supply device, even if the voltage applied to the motor of the pump is changed and the rotation speed or the like is changed, the water supply amount of the pump can be made the same, so that a stable water supply amount can be obtained.

EMBODIMENT OF THE INVENTION Hereinafter, one Example of this invention is described based on FIGS. In FIG. 1, the pump 1 is comprised by the impeller (not shown) of the pump part 1b connected directly to the rotating shaft of the motor 1a. A suction pipe 4 is connected to the suction side of the pump 1. The lower end of the suction pipe 4 reaches the tank water 3. The tank water 3 is separated from the water supply and stored in the tank. The discharge pipe 5 is connected to the discharge side of the pump 1. The discharge pipe 5 is provided with a valve 5a. The discharge pipe 5 is connected to the common pipe 6. At the end of the common pipe 6, a plurality of faucets 6a are branched off, and a plurality of faucets 6a are provided (only two are shown in FIG. 1). The pump 1 is connected in parallel between the tank water 3 and the common pipe 6 via the suction pipe 4 and the discharge pipe 5. The pump 1 is operated alone and in parallel according to the water supply amount. The discharge tube 5 of one pump 1 is provided with a pressure switch 7 and a pressure tank 8 constituting a pressure detecting means. The pressure detecting means may be a pressure sensor instead of the pressure switch 7. When water supply starts from the faucet 6a and the water in the pressure tank 8 is supplied, the pressure in the pressure tank 8 is lowered and the pressure switch 7 is closed. The signal from the pressure switch 7 is input to the instruction control unit 11 of the control unit 9. The control part 9 has the power detection part 10 which comprises the motor detection means which detects the operation state of the motor 1a. The power detection unit 10 detects power of the motor 1a, respectively, and the detection signal is output to the instruction control unit 11. The instruction control section 11 includes a calculation section 11a for calculating parallel milking control values by calculating from a signal from the power detection section 10 immediately after the pump 1 is started alone, and a signal from the power detection section 10. The comparison unit 11b for controlling the parallel operation of the pump 1 in comparison with the parallel operation control value and the pump 1 for single operation when repeating the independent operation and the parallel operation of the pump 1 alternately. The positioning part 11c which controls so that it is provided is provided. The signals from the instruction controller 11 are output to the motor 1a, respectively. The motor detecting means may be a current detecting part or a rotational speed detecting part instead of the power detecting part 10.

및

로 표시되어 있으며, 이

및

는 제3도의

및

에 이른다는 것을 나타낸다. 모터(1a)에는 진상용(進相用)콘덴서(18)가 접속되어 있다. 그리고, 전력검출부(10)는 전류검출부하도 된다.In FIG. 2, each motor 1a is connected in parallel to one power supply 12. In FIG. Electromagnetic contactors 13 and 14 are connected to this power supply circuit, respectively. In the magnetic contactors 13 and 14, the power detecting section 10 is connected to the power supply circuit on the power supply 12 side, respectively. The power detector 10 includes a Hall element 16 connected in parallel with a coil 15 connected in series to a power supply circuit and a rectification / smoothing circuit 17 connected to an output side thereof. Arbitrary electric power is detected by the DC voltage value as a relationship corresponding to electric power by using the multiplication operation. The output side of the rectification and smoothing circuit 17 is shown in FIG.

And

Is indicated by

And

Of the third degree

And

Indicates that the A phase advance capacitor 18 is connected to the motor 1a. The power detection unit 10 may be a current detection load.

In FIG. 3, the instruction control unit 11 is composed mainly of an instruction control element 19 such as a microcomputer. The power supply 12 is connected to the V _DD and V _SS ports of the instruction control element 19 through the power supply transformer 20, the rectification and smoothing circuit 21, and the constant voltage circuit 22. The clock circuit 23 for producing the reference timer of the instruction control element 19 is connected.

The coils 24 and 25 for opening and closing the magnetic contactors 13 and 14 (FIG. 2) are one-pole three-contact switch 26 and one pole 7a of the pressure switch 7. It is connected to the power supply 12 via.

Input to the instruction control element 19 is made from ports P10, P40, and P41. The circuit of the other pole 7b of the pressure switch 7 is connected to the port P10. Output ports (○ A and ○ B) of the power detection unit 10 of the motor 1 are connected to the ports P40 and P41 via the comparators 27 and 28. The D / A converter 29 converts the digital values of the ports P30, P31, P32, and P33 into analog values, generates a voltage corresponding to the determined power value, and inputs them to the comparators 27 and 28. The comparators 27 and 28 compare whether or not the output of the power detection unit 10 of the motor 1a has reached a predetermined value, and inputs the result to the ports P40 and P41.

One of the zero-crosting input circuits 30 is connected to the secondary side of the power supply transformer 2, and the other is connected to the port 1NT of the instruction control element 19. Signals are output from the ports P20 and P21 of the instruction control element 19 by zero cross-sampling, and are connected to drive the triacs 33 and 34 of the switching element via the phototriacs 31 and 32. It is. The triacs 33 and 34 are connected in parallel with the poles to which the coils 24 and 25 of the one-contact three-contact switch 26 are connected. By switching the three-contact switch 26 in one circuit, regardless of the instruction control signal from the instruction control element 19 or even when there is no instruction control signal due to a failure or the like, one pole 7a of the pressure switch 7 is provided. The energization and the stop of the coils 24 and 25 are performed by opening and closing of the pump, and the operation and the stop of the pump 1 are thereby performed.

A schematic operation of this automatic water supply device will be described with reference to FIG. 4 shows the pump characteristic diagram, and shows the water supply Q on the horizontal axis and the pressure H and the power W on the vertical axis. H ₁ represents the water supply rate-pressure curve for the single operation of the pump 1. H ' ₁ represents the water supply-pressure curve of the parallel operation of the pump 1. W ₁ represents the water supply-power curve of the pump 1. R ₁ and r ₁ represent the load curve of the pump 1. When both pumps 1 are stopped, the water supply starts from the faucet 6a, and when the pressure in the pressure tank 8 decreases to become the independent operation start pressure P _on (a point of H ₁ ), the pressure switch ( 7) is closed and No. 1 pump (1) runs alone. After the operation, when the water supply decreases and the pressure H ₁ rises to become the single operation stop pressure P _off (point b of H ₁ ), the number 1 pump 1 stops. When the water supply amount increases after the operation of the No. 1 pump 1 described above, and the pressure H drops and the motor 1a of the No. 1 pump 1 becomes the parallel operation starting power W _on (point C of H ₁ ), 2 The hose pump 1 is also operated. The parallel operation of the pump 1 is operated at the intersection d between the load curve R ₁ and the water supply-pressure curve H ' ₁ . In this state, when the water supply amount Q from the faucet 6a decreases so that the motor 1a of the pump 1 becomes the power to turn _{off the} parallel operation W _off , the operation of the preceding No. 1 pump 1 is stopped, followed by 2 No. is the single operation of the pump (1) (f point of the H _1).

Next, a control method of such an automatic water supply device will be described with reference to FIGS. 5 shows the main routine. The process is started by closing the power supply 1, and initial setting is first made (500). In this initial setting, the parameter areas F, S, and J are secured in the random access memory on the instruction control element 19, and F = 1, S = 0, and J = 0 are provided. F is for No.1 pump control, S is for No.2 pump control, and J is a parameter for judging parallel operation. Then, if the air pressure P _on the pressure switch (7) and (510), _on the pressure P reaches the subroutine for operating the pump (1) 520.

6 shows movable western urchins. In the operating western series, first determine whether the F parameter is 1 inch (600) .If F = 1, the No.1 pump (1) is pre-operated (610) and if F ≠ 1, the No.2 pump (1). ) Is pre-operated (620), the power W _s1 of the motor (1a) of the pump (1) operated immediately thereafter is detected (630), and the parallel operation starting power W _on and _{on the} basis of the detected power W _s1 . Calculate the parallel operation release power W _off (640) and return to the main putin. After returning to the main routine, the process proceeds to the parallel control subroutine (530).

Figure 7 shows the parallel control brutin. The parallel control routine detects the power W of the motor 1a of the pump 1 in operation (710), compares this power W ₁ with the parallel operation starting power W _on (720), and W ₁ ≥ W _on. If it is, the pump 1 which has been previously operated alone is determined as an F parameter (730). The F parameter is operated after the No. 2 pump 1, which is F = 1 and not operated (740), and when F ≠ 1, is operated after the No. 1 pump 1, which is not operated (750). Then, the J parameter is set to J = 1 (760) to indicate that parallel operation is in progress, and the control returns to the main routine. The detection power W ₁ and the set power W _on of the motor 1a described above are compared (720), and if W ₁ <W _{on, the} F parameter is compared with J = 1 (77), and J ≠ 1 (single operation). Medium) returns to the main routine, and if J = 1 (parallel operation), the detected power W ₁ is compared with the parallel operation cancel power W _off (771). W _1> W _off and is returned to the main routine, and if W ₁ ≤W _off parameter F is determined (772). If the F parameter is F = 1, the No. 1 pump 1 that has been started up is stopped (773), and if F? 1, the No. 2 pump that has been started up is stopped (774). The state and the state of the S parameter are reversed (inverting # 1 ＂and # 0＂) to change the positioning of the preceding and following (775), and then the J parameter is set to J = 0 to indicate parallel operation cancel. (776), return to the main routine.

Thereafter, the main routine waits for the pressure P _off of the pressure switch 7 (540), and repeats the parallel control until the pressure P _off . When the pressure P _off , the operating pump 1 is stopped (550). Subsequently, the state of the F parameter and the state of the S parameter are reversed (inverting # 1 ＂and # 0＂), the preceding and following positionings are switched (560), and the pressure P of the pressure switch 7 is waited ( 510).

8 shows a time chart showing an example of an operating state of such an automatic water supply device. As is apparent from this figure, it can be seen that the operating times of the first pump and the second pump are averaged.

In this control method, it will be explained based on FIG. 9 and FIG. 10 that control is possible even when the rotation speed of the motor 1a of the pump 1 changes. 9 shows the pump characteristic diagram when the rotation speed of the motor 1a of the pump 1 changes, and shows the water supply amount Q on the horizontal axis and the pressure H and the power W on the vertical axis. ₁ H ~H ₃ is a single operation of the water supply pump (1) shows a case where change of the pressure characteristic curve, the number of revolutions ratio of "1", "0.95", "0.9". ₁ H ~H ₃ is a parallel operation of the water supply pump (1) and pressure characteristic curve, a case where change of the revolution speed ratio of "1", "0.95", "0.9". W ₁ ~W ₃ is a water supply pump (1) and the power characteristic curve, a case where change in the rotational speed ratio of "1", "0.95", "0.9". r represents a load curve. The pressure is lowered, and the pressure switch 7 is closed by the onset starting pressure P _on , and the power of the motor 1a of the pump 1 immediately after the pump 1 is operated alone is W _s1 . Can be obtained based on the power W _s1 . Set the parallel operation start power to W _on1 and the parallel operation release power to W _off1 .

The water supply at each of these points is Q _s1 , Q _on and Q _off . The parallel operation start power of W _2, W ₃ in the parallel operation start water supply Q _on W _on2, in W _on3, and in parallel driving off water supply Q _off, W _2, W ₃ parallel operation off power W of At the same time that _off2, W _off3, H _2, is referred to a start power of single operation of the pump 1 in the H ₃ W _{s2, s3} W.

Thus, the disclosed pump 1 in parallel operation and the detection power W _s1, W _s2, W _s3 of the motor (1a) in a state just after single operation power W _on1, R _on2, W _on3 or parallel running off power W _off1, W _off2 , W _off3 is linear as shown in FIG. 10 and can be expressed by the following equation.

W _on = K ₁ W _s + K ₂ ............. (1)

W _off = K ₃ W _s + K ₄ ............. (2)

(K ₁ to K ₄ are constant)

Therefore, the parallel operation start power W _on and the parallel operation release power W _off can be easily calculated by the detection power W _s .

According to such an automatic water supply device and its control method, the detection power W _s corresponding to the water supply Q with high accuracy compared to the pressure becomes a reference signal, and the parallel operation start power W _on or parallel operation calculated from the detection power W _{1 is further} obtained. The release power W _off can be set corresponding to the water supply amount Q irrespective of the discharge pressure of the pump 1 directly. This makes it possible to control the start or stop of parallel operation with high accuracy and reliably corresponding to the water supply amount Q. The parallel operation of the pump 1 is not started even if the pressure tank 8 is miniaturized and a pressure drop that does not correspond to the water supply amount temporarily occurs.

In addition, according to such an automatic water supply device, the pump 1 in each individual operation is alternately operated at the time of the parallel operation of the pump 1 and the repetition of the independent operation, so that the operation time and the frequency of operation of each pump 1 are Can be made uniform.

Furthermore, according to such an automatic water supply device, even if the voltage applied to the motor 1a of the pump 1 fluctuates and the rotation speed or the like changes, the water supply amount of the pump 1 can be made the same, thereby obtaining a stable water supply amount. Can be.

According to the present invention, firstly, an automatic water supply apparatus capable of controlling parallel operation with high precision and reliably in response to a water supply amount and a control method thereof can be provided. Second, it is possible to provide an automatic water supply device that can further uniformize the operation time and the number of times of operation of the pump. Third, it is possible to provide an automatic water supply device that can obtain a more stable water supply.

Claims (10)

A pump having a motor is connected in parallel, a pressure tank is connected to the discharge side of the pump, a pressure detection means is provided on the earth storage side of the pump, and a signal from the pressure detection means is controlled to control the operation of the pump. An automatic water supply device having a control unit, comprising: a motor detecting means for detecting an operation state of the motor, and calculating a parallel operation control value by calculating from a signal from the motor detecting means immediately after starting the pump alone. And a comparator for comparing the signal from the motor detecting means with the parallel operation control value and controlling the parallel operation of the pump. The automatic water supply device according to claim 1, wherein the pressure detecting means is a pressure switch. The automatic water supply device according to claim 1, wherein the motor detecting means is a power detector for detecting electric power of a motor. The automatic water supply device according to claim 1, comprising a control unit including a microcomputer. The automatic water supply device according to claim 1, wherein the parallel operation control value is set as a parallel operation start value. The automatic water supply device according to claim 1, wherein the parallel operation control value is set as a parallel operation start value and a parallel operation release value. 7. The automatic water supply device according to claim 5 or 6, wherein the parallel operation start value is set to a value corresponding to a larger amount of water supply than the start of the independent operation of the pump. A pump connected in parallel with a motor, a pressure tank connected to the discharge side of the pump, pressure detecting means provided on the discharge side of the pump, motor detecting means for detecting an operating state of the motor, and the pressure detecting means. A control unit for controlling the operation of the pump in response to a signal of the signal; and starting the single operation of the pump with the signal from the pressure detecting means, and then controlling the parallel operation by the signal from the motor detecting means immediately after that. Value is calculated, and then the parallel operation of the pump is started when the signal from the motor detection means is always compared with the parallel operation control value and becomes a predetermined signal. A pump connected in parallel with a motor, a pressure tank connected to the discharge side of the pump, pressure detecting means provided on the discharge side of the pump, and a control unit for controlling the operation of the pump by receiving a signal from the pressure detecting means. An automatic water supply device, comprising: a calculating section for providing a motor detecting means for detecting an operating state of the motor, and calculating a parallel operation control value by calculating the signal from the motor detecting means immediately after starting the pump alone; A comparison unit for controlling parallel operation of the pump by comparing the signal from the motor detecting means with the parallel operation control value, and a pump for independent operation when the independent operation and the parallel operation of the pump are repeated. An automatic water supply device characterized by comprising a positioning unit for controlling in the control unit. A pump connected in parallel with a motor, a pressure tank connected to the discharge side of the pump, pressure detecting means provided on the discharge side of the pump, and a control unit for controlling the operation of the pump by receiving a signal from the pressure detecting means. In the automatic water supply device provided, a motor detecting means for detecting an operation state of the motor is provided, and a parallel operation control value is calculated by calculating the signal from the motor detecting means immediately after starting the pump alone. And a comparator for controlling the parallel operation of the pump by comparing a signal from the motor detecting means with the parallel operation control value.

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