JPH06341156A - Variable speed water feeder - Google Patents

Abstract

PURPOSE:To moderate the abrupt variation of the flow rate and the delivery pressure of a feed water pump and prevent the constituents of the flow way from deteriorating and improve the usability of utilities, by gradually increasing the revolution of feed water pump, when only a small quantity of feed water is detected. CONSTITUTION:Before a feed water pump 1 in which only a small quantity of water is detected by a detector 3, is stopped, a pressure tank 5 is pressurized and accumulated with water. In this time, an output-delaying means 15 of a pressurizing signal controls so as to gradually increase the pump revolution by multiplying a certain revolutional number output from a pump controller 7 by a specified time and outputting the revolution to a variable-speed means 2. And hence, the revolutional number of feed water pump driven by the variable-speed means 2 is gradually increased for a specified time interval and a specified volume of water is accumulated and pressurized in the pressure tank 5. Accordingly, abrupt variation of flow rate and delivery pressure is moderated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable speed water supply system, and more particularly to a variable speed water supply system having a small water quantity stopping function for stopping a water supply pump when the load is small.

[0002]

2. Description of the Related Art A variable speed water supply apparatus adjusts a flow rate and a discharge pressure by changing the rotation speed of a water supply pump for supplying water according to a load. FIG. 3 is a block diagram showing the overall configuration of a conventional variable speed water supply device, and FIG. 4 is a graph showing the operation of the water supply device shown in FIG. As shown in FIG. 3, the water feed pump 1 is driven by a variable speed means 2 such as an inverter to load the load 2.
The number of rotations can be varied according to the required water amount of 0 or the like. A small water amount detecting means 3 and a check valve 4 are provided on the discharge side of the water supply pump 1, and a pressure tank 5 capable of accumulating pressure on the downstream side of the check valve 4 and a pressure detection for detecting the pressure of the pressure tank 5. Means 6 and are provided.

The pump control means 7 is a control circuit including a microcomputer, and controls the start, stop and rotation speed of the water supply pump 1. When the amount of water used in the load 20 decreases and the small water amount detecting means 3 generates a small water amount detection signal, the rotation speed is maintained as it is for a certain small amount of water detection time, and then the water supply pump 1 is kept in the pressure tank 5 for a certain time. Has a function of outputting a signal for stopping the water supply pump 1 after increasing the number of revolutions, that is, accumulating at a constant pressurizing frequency or pressurizing pressure value. Further, the pump control means 7 stores the pump starting pressure set value, and when the value of the pressure signal from the pressure detecting means 6 becomes less than or equal to the pump starting pressure set value while the water supply pump 1 is stopped, the water supply pump 1 It has a function of outputting a signal for starting.

Therefore, according to such pump control means 7,
When the amount of water used by the load 20 decreases, the rotational speed of the water supply pump 1 is once increased to accumulate the pressure in the pressure tank 5, and then the water supply pump is stopped. Then, the supply of the amount of water to the load reduces the pressure in the pressure tank 5, and when the pressure becomes equal to or lower than the pump starting pressure set value, the pump is started to start a steady operation. Accumulating pressure in the pressure tank 5 before stopping the water supply pump 1 when the amount of water is small is to increase the pressure of the pressure tank so as to secure the stop time of the water supply pump 1 and the number of times the water supply pump 1 is started when the amount of water is small. This is because the driving time can be reduced.

[0005]

However, in the operation of accumulating pressure in the pressure tank 5 in the conventional variable speed water supply apparatus, the rotational speed or discharge pressure of the pump output from the pump control means 7 to the variable speed means 2 is shown in FIG. As shown in (1), since the pressure is raised to the pressure frequency value (50 Hz) or the pressure pressure value (31 mH ₂ O) all at once, there is a problem that the flow rate and the discharge pressure suddenly change. When such a sudden flow rate fluctuation or pressure fluctuation occurs, for example, in the case of a large number of loads such as a shower, the running water state fluctuates in each shower, which is not convenient, and depending on the degree of instantaneous pressure increase. However, there is also a problem of causing deterioration of equipment such as showers and pipes that form the flow path.

The present invention has been made in view of the above circumstances, and alleviates rapid flow rate fluctuations and discharge pressure fluctuations when a small amount of water is stopped, and reduces deterioration of flow path components such as devices and piping. At the same time, it is an object to provide a variable speed water supply device with a convenient load that can obtain a smooth change in the amount of water.

[0007]

In order to achieve the above object, a variable speed water supply apparatus of the present invention comprises a water supply pump, variable speed means for driving the rotation speed of the water supply pump to a variable speed, and the water supply pump. A small amount of water detection means and a check valve provided in the flow path, a pressure tank provided on the downstream side of the check valve, a pressure detection means for detecting the pressure of the pressure tank, and the start of the water supply pump And a pump control means for controlling stop and rotation speed, the pump control means stores the pressure in the pressure tank at a constant rotation speed for a fixed time when the small water quantity detection means generates a small water quantity detection signal. After that, it has a function of stopping the water supply pump and a pump starting pressure set value, and when the pressure of the pressure tank becomes below the pump starting pressure set value by the pressure detection means while the water supply pump is stopped, the water supply pump To start In variable speed water supply apparatus having a capability, a certain time to the pressure tank the low water amount detecting means generates a small amount of water detection signal, when the accumulator at a constant rotational speed,
It is characterized in that a pressurizing signal output delay means for gradually increasing the rotational speed over a certain period of time is provided.

[0008]

In the present invention, when accumulating the pressure in the pressure tank before stopping the pump when a small amount of water is detected, the pressurization signal output delay means outputs the constant rotation speed (pressurization frequency value) output from the pump control means. , Pressurization pressure value) is gradually increased over a predetermined period of time, and the rotation speed is output to the variable speed means. Therefore, the water supply pump driven by the variable speed means has a predetermined rotation speed. Gradually increase over time. As a result, the flow rate and pressure on the discharge side of the water supply pump gradually increase over a predetermined period of time while the pressure tank 5
The amount of water is accumulated in.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 is a block diagram showing the overall configuration of the variable speed water supply apparatus, and FIG. 2 is a graph showing the operation of the variable speed water supply apparatus of FIG. As shown in FIG. 1, the flow path 10 is composed of flow path components such as various devices and pipes, and supplies a variable amount of water flow to a load 20 such as a large number of showers. Water supply pump 1 provided in the flow path 10
Is for sucking water from the suction port 11 and sending it to the discharge side, and is driven by the variable speed means 2 at a variable rotation speed. The variable speed means 2 is, for example, an inverter, and when a certain signal is input, an AC voltage having a frequency proportional to this input signal. Is output from the DC power supply to increase / decrease the rotation speed of the drive motor of the water supply pump 1 and increase / decrease the rotation speed of the pump 1.

The discharge side flow passage 12 of the water supply pump 1 is provided with a small water amount detecting means 3 for detecting a small water amount state which is, for example, a flow switch. A check valve 4 for preventing backflow of water is provided in the discharge-side flow path 12 at a position downstream of the small water amount detection means 3.

A pressure tank 5 capable of accumulating pressure is provided in the downstream passage 13 of the check valve 4. The connecting pipe 14 connecting the downstream side flow path 13 and the pressure tank 5 is provided with a pressure detecting means 6 including a pressure sensor for detecting pressure.

The pump control means 7 for controlling the water supply pump 1 via the variable speed means 2 has a small water quantity detection signal S ₂ from the small water quantity detection means 3 which is less than a fixed amount and a pressure signal S from the discharge pressure detection means 6. The rotation speed of the pump and the start and stop of the pump are controlled based on ₁ . When the required water amount of the load 20 such as a shower is large, the pump control means 7 controls the rotation speed of the pump 1 based on the signal S ₁ of the pressure detection means 6 so that the required water amount can be supplied. When the required amount of water of the load 20 such as a shower becomes small, in order to avoid frequent start and stop of the pump 1, once the pressure of the pressure tank 5 is raised and the rotational speed of the pump is raised so as to secure a certain amount of water, Stop pump 1. When the amount of water accumulated in the pressure tank 5 decreases and becomes equal to or lower than a certain pressure (pump starting pressure set value), the signal S _{1 from the} pressure detecting means 6 again causes the pump 1
To start.

The pressurization signal output delay means 15 is for gently increasing the rotational speed of the pump when a small amount of water is detected. The pressurization signal output delay means 15 gradually increases the rotation speed of the pump to a predetermined pressurization value (or frequency) over a predetermined time when accumulating the pressure in the pressure tank 5 before stopping the water supply pump 1. As described above, it is a means for controlling the rotation speed of the pump, and is formed by software of a control circuit including a microcomputer.

In FIG. 2, FIG. 2C shows a variable operating frequency (rotation speed) output from the pressurization signal output delay means 15.
FIG. 3B shows the flow rate of water flowing through the flow path 12, and FIG. 4A shows the discharge pressure detected by the pressure detection means 6. For example, as shown in the figure, when the operating frequency, the flow rate, and the discharge pressure between times T _{1 and} T ₂ are 39 Hz, 15.3 l / min and 18 mH ₂ O, respectively, the small water amount detecting means 3 operates at time T _2. It is assumed that the small water amount detection signal S ₂ is output. When the small water amount detection signal S ₂ is output to the pump control means 7, the pump control means 7 outputs a signal of a variable operation frequency to the pressurization signal output delay means 15. The pressurization signal output delay means 15 changes the variable operating frequency to T
_The pressure frequency value is gradually increased linearly between ₂ and T ₃ (about 10 seconds) to increase the pressurizing frequency value from 39 Hz to the maximum value of 50 Hz.

The variable operating frequency thus gradually increased is output from the pressurization signal output delay means 15 to the variable speed means 2, and the variable speed means 2 outputs a power supply voltage proportional to this to the drive motor of the water feed pump 1. Since the motor rotation speed is gradually increased, the amount of water supplied by the water supply pump 1 is gradually increased. Therefore, as shown in FIGS. 2B and 2A, the flow rate and the discharge pressure also gradually increase.

The operating frequency which has reached the maximum value (50 Hz) in about 10 seconds is maintained at the maximum value for about 10 seconds between times T ₃ and T ₄ , and therefore the pressurizing signal output delay means 15 is provided. Outputs the signal for stopping the water supply pump 1 after continuing the operation of the water supply pump 1 and accumulating the pressure in the pressure tank 5 to set the operating frequency to 0. As a result, the time T ₃
From T to T ₄ , the flow rate is, for example, 20.4 l / min
The discharge pressure is 31 mH ₂ O. As described above, only during the pressure accumulating operation to the pressure tank 5 before the stoppage of the small amount of water, the variable operation frequency to the variable speed means 2 is gradually increased by the pressurizing signal output delay means 15 for about 10 seconds to the maximum. The water supply pump 1 is controlled so as to reach the value, and the water supply pump 1 is stopped after continuing the operation at the maximum value for about 10 seconds.

Therefore, the flow rate and the discharge pressure at the time of detecting the small amount of water do not increase instantaneously, and the flow rate fluctuation and the pressure fluctuation are significantly reduced. For example, the downstream side flow path 13 of the flow path 10
In addition, when the shower 20 for discharging a small amount of water is provided as a load, the shower 20 discharges stable water without abrupt flow rate fluctuations and pressure fluctuations. Therefore, the running water state of the shower 20 does not change, the usability is improved, and the comfort of the water supply device can be improved.

Further, since the check valve 4 is provided in the discharge side flow passage 12 of the water supply pump 1, when the water supply pump 1 is stopped, the downstream side flow passage 1 is generated by the pressure accumulated in the pressure tank 5.
The water 3 does not flow back to the water supply pump 1 side, but always flows in the direction of the shower 20.

In the above embodiment, the time for raising the variable operating frequency to the maximum value is about 10 seconds, and the time for operating at the maximum value is about 10 seconds. It can be variably set according to the driving situation.

As described above, according to the present invention, during the pressure accumulating operation to the pressure tank 5 before the stop of the small amount of water, the rapid flow rate fluctuation and the pressure fluctuation are eliminated, so that the devices and pipes provided in the flow path are not affected. The deterioration of the flow path components can be reduced,
The user can easily use the load such as a shower. Therefore, the comfort and economy of the water supply device can be improved, and the life of load equipment such as a shower, water supply pump and piping can be extended. In the drawings, the same reference numerals indicate the same or corresponding parts.

[0021]

Since the present invention is configured as described above, it is possible to mitigate rapid flow rate fluctuations and discharge pressure fluctuations, prevent deterioration of flow path components such as equipment and piping, and load equipment. You can provide a comfortable water supply.

[Brief description of drawings]

FIG. 1 is a block diagram showing an overall configuration of a variable speed water supply apparatus according to an embodiment of the present invention.

FIG. 2 is a graph showing an operation of the variable speed water supply system of FIG.

FIG. 3 is a block diagram showing an overall configuration of a conventional variable speed water supply apparatus, which is equivalent to FIG.

4 is a graph showing an operation of the variable speed water supply system of FIG. 3, and is a view corresponding to FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water supply pump 2 Variable speed means 3 Small water amount detection means 4 Check valve 5 Pressure tank 6 Discharge pressure detection means 7 Pump control means 10 Flow path 12 Discharge side flow path 13 Downstream flow path 15 Pressurized signal output delay means

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[Procedure amendment]

[Submission date] August 26, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0005

[Correction method] Change

[Correction content]

[0005]

However, in the operation of accumulating pressure in the pressure tank 5 in the conventional variable speed water supply apparatus, the rotational speed or discharge pressure of the pump output from the pump control means 7 to the variable speed means 2 is shown in FIG. As shown in (1), since the pressure is raised to the pressure frequency value (50 Hz) or the pressure pressure value (31 mH ₂ O) all at once, there is a problem that the flow rate and the discharge pressure suddenly change. When such a sudden flow rate fluctuation or pressure fluctuation occurs, for example, in the case of a large number of loads such as a shower, the running water state fluctuates in each shower, which is not convenient, and depending on the degree of instantaneous pressure increase. However, there is a problem in that the devices such as the shower and the pipes that constitute the flow path are deteriorated. Furthermore,
If the pressure is rapidly increased as in the past when accumulating pressure, a small amount of water
Even in the case of volume load, a small amount of water detection means such as flow
Flapping of the switch was confirmed. Also, water in the pump
The temperature tends to increase as the pump speed increases.
It Therefore, the water temperature rises when the rotation speed is rapidly increased.
There was a problem that

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction content]

As described above, according to the present invention, during the pressure accumulating operation to the pressure tank 5 before the stop of the small amount of water, the rapid flow rate fluctuation and the pressure fluctuation are eliminated, so that the devices and pipes provided in the flow path are not affected. The deterioration of the flow path components can be reduced,
The user can easily use the load such as a shower. Therefore, the comfort and economy of the water supply device can be improved, and the life of load equipment such as a shower, water supply pump, and piping can be extended. Change
In addition, by gradually increasing the pressure over a predetermined time,
Therefore, the fluttering of the flow switch can be prevented. Also, gradually
By increasing the pump speed to
The rise in water temperature inside the pump can be suppressed more than when raising it.
it can. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A water supply pump, a variable speed means for driving the rotation speed of the water supply pump to a variable speed, a small water amount detecting means and a check valve provided in a flow path of the water supply pump, and the check valve. A pressure tank provided on the downstream side of the pressure tank, a pressure detection unit for detecting the pressure of the pressure tank, and a pump control unit for controlling the start, stop, and rotation speed of the water supply pump. , The small water amount detecting means generates a small water amount detection signal, and after accumulating pressure in the pressure tank at a constant rotation speed for a certain period of time, has a function of stopping the water supply pump, a pump starting pressure set value, and the water supply In the variable speed water supply device having a function of starting the water supply pump when the pressure of the pressure tank becomes equal to or lower than the pump starting pressure set value by the pressure detection means while the pump is stopped, the small water amount detection means is a small water amount. Inspection A pressure signal output delay means for gradually increasing the number of revolutions over a certain period of time when a signal is generated and pressure is accumulated in the pressure tank at a certain number of revolutions for a certain period of time is provided. Variable speed water supply device.