JPH05142012A - Measuring device of flow rate - Google Patents

Abstract

PURPOSE:To make it possible to meter a flow rate in a wide range by a construction wherein a service tank having sensors for controlling a pump in accordance with the height of the level is connected in series to the pump and a check valve and the check valve and a combustion apparatus are connected in front of the tank. CONSTITUTION:Bellows 10a sealed up is disposed in a service tank 10 coaxially therewith and a detecting plate 10b having magnetism is provided at the bottom of the bellows. Besides, a low level sensor 11 and a high level detecting sensor 12 are provided on the wall surface of the tank 10. A pump 3 is driven when the sensor 11 operates, and it is stopped when the sensor 12 operates. When the quantity of kerosine in the tank 10 is small, the pump 3 is made to operate by the sensor 11 and the kerosine passes through a meter 7, a check valve 8 and a flow control valve 9 and enters the tank 10. The control valve 9 controls a flow rate so that it can be metered highly precisely by the meter 7. The kerosine inside the tank 10 compresses the bellows 10a, the detecting plate 10b rises and makes the sensor 12 operate and thereby the pump 3 is stopped. By using a general-purpose meter, kerosine or the like can be metered simply and easily in a wide range of the flow rate.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a flow rate measuring device, and more specifically, it measures a measured fluid in a highly accurate flow rate range using a flow meter with low accuracy in a low flow rate range and high accuracy in a medium flow rate range or higher. The present invention relates to a flow rate measuring device capable of highly accurate measurement even with a load used in a low flow rate range.

[0002]

2. Description of the Related Art In animal biology, the drinking water dose varies with time, is large during activity hours, and is hardly consumed during sleep hours. However, in ecological research, the color density gradually decreases when the amount of water consumed by the animal is adjusted by group per hour, or in the dyeing industry, during the process of dyeing by applying a dye of a specified concentration at a specified flow rate. To do. On the other hand, when adding a dye by detecting the concentration in order to keep the concentration constant, or in a cold area where city gas cannot be supplied, kerosene pressure-fed from a tank such as kerosene is used for different day and night usage. When the accuracy of the flowmeter cannot be maintained over all of these flow rate ranges because the flow rate range of the fluid to be metered is extremely wide, such as when distributing to households and collecting charges according to the distributed flow rate, It becomes impossible to achieve the purpose. In particular, it may be unfair when collecting fees.

As the measuring meter, a small flow meter such as a positive displacement flow meter or a Mabin meter (mainly a cut line type turbine meter) is used. In general, a flow meter having a drive unit has a rotating mechanism driven by a pressure difference of fluids, so that the friction torque of the rotating mechanism cannot be ignored in a small flow range where the fluid pressure difference is small, and the accuracy in the small flow range is low. However, looking at the case of trading kerosene with a metering meter, as mentioned above, the consumption line is equipped with several combustion equipment such as bath, water heater, or cooktop, and the consumption per unit time until normal combustion Changes drastically, so the flow rate range is 1:10
There is no meter that can measure this with a predetermined accuracy with one meter.

[0004]

[Purpose] The present invention has been made in view of the above-mentioned circumstances, and is an inexpensive flow rate for measuring a fluid flow rate with an accuracy that can be traded in a wide flow rate range consumed using a general-purpose meter currently available on the market. It is made for the purpose of providing a measuring device.

[0005]

In order to achieve the above object, the present invention provides (1)
A fluid source, a pump for pumping the fluid, a meter,
A first check valve that opens in a forward flow; and a signal that changes the level according to the volume of the inflowing fluid and stops the pump when the fluid volume reaches a high level, and a pump when the level is low. A serial line in which a service tank equipped with a sensor for transmitting a signal that activates is sequentially connected to a flow path between the service tank and the first check valve, and which is opened in a forward flow. A check valve and a branch line in which a combustion device is connected in series, controlling the pump by a stop signal and an operation signal of the sensor, and further,
(2) In the above (1), the service tank is housed in a closed container, the one surface of which is fixed to the closed container, and the bellows extended by the tension of a spring and the wall surface of the closed container. A level sensor that detects the position of the bottom surface of the bellows and sends a signal when the bottom surface reaches a vertical level, and (3) In (1) above, the service tank is a sealed outside. A cylinder, a cylinder arranged in the outer cylinder, a piston that moves airtight in the cylinder, a piston rod that is fixed to the piston and moves airtight in the outer cylinder outside the cylinder, and the piston And a level sensor for detecting and outputting the vertical position of the rod. Hereinafter, description will be given based on examples of the present invention.

FIG. 1 is a block diagram for explaining the flow rate measuring device of the present invention. In the figure, 1 is a tank, 2 and 5 are liquid supply pipes, 3 is a pump, 4 is a control panel, and 6 is an opening and closing. Valve, 9,1
5a, 16a and 17a are flow rate control valves, 8 is a first check valve,
10 is a service tank, 11 is a low level sensor, 12 is a high level sensor, 13 is a second check valve, and 14 is a branch pipe.

In the figure, a tank 1 serves as a liquid source. The tank 1 is filled with kerosene, for example, and the kerosene is pumped through a liquid supply pipe 2 to a liquid supply pipe 5 by a pump 3. It The liquid supply pipe 5 includes an opening / closing valve 6 and a meter 7
The check valve 8 and the flow rate control valve 9 are connected in series and transferred to the service tank 10. A branch pipe 14 is connected between the service tank 10 of the liquid supply pipe 5 and the check valve 8 (the flow rate control valve 9 in the figure), and the check valve 13 is provided in the branch pipe 14 and the check valve is provided. Each of the valves 13 has a flow control valve 15a, 1a.
Combustion devices such as a cooking table 15, a water heater 16 and a bath 17 are connected via 6a and 17a.

The service tank 10 is an airtight container, and a bellows 10a, which is stretched and sealed by a spring (not shown) or the like, is sealed inside.
Are coaxially arranged, and a detection plate 10b made of, for example, a magnetic plate sensitive to a magnetic sensor is provided on the bottom surface of the bellows 10a. The magnetic sensor is arranged on the wall surface of the service tank 10. A sensor 11 for detecting a low level and a sensor 12 for detecting a high level are respectively connected to a control panel 4 for controlling a pump.
Pump 3 to drive pump 3 when sensor 11 operates and to stop pump 3 when sensor 12 operates.
To control.

Next, the operation of the flow rate measuring device of the present invention having the illustrated construction will be described. First, when the kerosene in the service tank 10 is low and the low level sensor 11 is activated to drive the pump 3, the kerosene in the tank 1 is sucked and the meter 7, the check valve 8 and the flow rate control valve 9 are moved in the direction of arrow Q. Is circulated and is pumped into the service tank 10. The flow rate control valve 9 is for adjusting the flow rate of the kerosene measured by the meter 7 to a highly accurate amount, and the kerosene in the service tank 10 compresses the bellows 10b while being accommodated in a highly accurate measurement volume. .. The detection plate 10b rises according to the amount of compression, and the sensor 12
Is activated to stop the pump 3.

The kerosene in the service tank 10 does not flow backward by the first check valve 8 and the second check valve 1 of the branch pipe 14 does not flow back.
3 is consumed and consumed in combustion equipment such as the cooking table 15, the water heater 16 and the bath 17. Therefore, the meter 7 does not measure during this period. The above has described the case where the consumption flow rate of kerosene is obtained, but it is not necessarily limited to kerosene, and it is used or consumed in the low flow rate range by using a commercially available ordinary meter with low accuracy in the low flow rate range. The present invention can be applied to any measurement target that can measure a very small flow rate as a batch quantity with a flow rate in the middle flow rate range or higher that is measured with high accuracy and can measure with high accuracy as an overall flow rate.

FIG. 2 is a diagram showing another embodiment of the service tank in the flow rate measuring device of the present invention, in which 20 is a service tank, 21 is an outer cylinder, 22 is a pressure gauge, 23 is a cylinder, and 24 is. A piston, 25 is a piston rod, 26 is a weight, 27 is a valve device, and 28 is a level sensor.

The outer cylinder 21 of the illustrated service tank 20 is a closed container, the inside of which is kept at a constant pressure (for example, near atmospheric pressure) and is monitored by a pressure gauge 22. Valve device 27
Is for adjusting the pressure to be constant. A cylinder 23 communicating with the liquid supply pipe 5 is accommodated in the outer cylinder 21, and a piston 24 liquid-sealed with a seal material 24a is vertically movably fitted in the cylinder 23. The piston rod 25 of the piston 24 has a length such that it can move within the outer cylinder 21, and a weight 26 is provided at the end thereof if necessary. The weight 26 has a role of a position sensor. When the weight 26 moves up and down, it sends a low level position 28a and a high level position 28b to the level sensor 28 and transmits a signal to the control panel 4. According to the service tank 20, the pressure in the cylinder 23 is determined by the weight of the piston 24, the piston rod, and the weight 26, and it is possible to always supply constant-pressure kerosene to the combustion equipment.

[0013]

[Effect] As is apparent from the above description, according to the present invention, it is possible to reduce the consumption flow rate of a fluid such as kerosene with an accuracy that can be traded in a wide flow rate range consumed using a general-purpose meter currently available on the market. You can easily measure with.

[Brief description of drawings]

FIG. 1 is a configuration block diagram for explaining a flow rate measuring device of the present invention.

FIG. 2 is a diagram showing another embodiment of the service tank in the flow rate measuring device of the present invention.

[Explanation of symbols]

1 ... Tank, 2, 5 ... Liquid supply pipe, 3 ... Pump, 4 ... Control panel, 6 is an on-off valve, 9, 15a, 16a, 17a ... Flow control valve, 8 ... First check valve, 10 ... Service tank , 11 ...
Low level sensor, 12 ... High level sensor, 13 ... Second check valve, 14 ... Branch pipe.

Claims (3)

[Claims] 1. A fluid source and a pump for pumping the fluid,
A meter and a first check valve that opens in a forward flow,
A service tank provided with a sensor that changes a level according to the volume of inflowing fluid and outputs a signal for stopping the pump when the fluid volume reaches a high level, and a signal for operating the pump when the fluid level is low. A serial line that is sequentially connected, a second check valve that is connected to the flow path between the service tank and the first check valve, and that opens in a forward flow, and a branch line that connects the combustion device in series And a pump for controlling the pump by a stop signal and an operation signal of the sensor. 2. The service tank is housed in a closed container, the one surface of which is fixed to the closed container, the bellows extended by the tension of a spring, and the bottom surface of the bellows disposed on the wall surface of the closed container. 2. The flow rate measuring device according to claim 1, further comprising: a level sensor that detects the position of the position and sends a signal when the bottom surface reaches a vertical level. 3. The service tank includes a closed outer cylinder,
A cylinder disposed in the outer cylinder, a piston that moves airtight in the cylinder, a piston rod that is fixed to the piston and moves airtight in the outer cylinder outside the cylinder,
The flow rate measuring device according to claim 1, further comprising a level sensor that detects and outputs the vertical position of the piston rod.