JP6858592B2 - Liquid transfer device and liquid transfer method - Google Patents

Description

The present invention relates to a liquid transfer device and a liquid transfer method.

In a water treatment device or the like, it is necessary to transfer the liquid to be treated. As a pump used for such liquid transfer, an airtight container for inflowing / discharging the liquid to be transferred (liquid to be transferred) and a U-shaped tube serving as a water seal are provided, and air is allowed to flow into the airtight container. The liquid is transferred by repeating the step of discharging the liquid by the pressure and the step of lowering the internal pressure by breaking the water seal of the U-shaped tube after discharging a certain amount of the liquid and flowing the liquid into the airtight container. There is something to do (hereafter, such a pump is called a "pneumatic pump").
Techniques related to such pneumatic pumps are disclosed in Patent Documents 1 to 4.

Japanese Unexamined Patent Publication No. 7-279899 Japanese Unexamined Patent Publication No. 9-203400 Japanese Unexamined Patent Publication No. 11-11459 Japanese Unexamined Patent Publication No. 2003-13899

Pneumatic pumps have a simple structure (that is, inexpensive), are less likely to break down because they have no mechanical moving parts, and can transfer even highly viscous fluids and SS-containing liquids. In addition, since the amount of one discharge is accurate (the height of the water seal determined by the U-shaped tube is constant and the volume of the liquid discharged at one time is constant), the quantitativeness is relatively high. good. The pneumatic pump is an excellent liquid transfer device having these characteristics.
However, since the power source is air, there is a problem that it is somewhat difficult to control the transfer amount per hour. As mentioned above, the amount of liquid discharged at one time is accurate, but it is difficult to stably and arbitrarily control the amount of air that is the power source (control based on the amount of air). It is difficult to arbitrarily change the amount of liquid transferred. In principle, one discharge of liquid occurs by supplying a predetermined amount of air, but "supplying a predetermined amount of air" can be performed by controlling an air supply source such as a blower. It's not easy. Air (gas) has a wide range of volume fluctuations and pressure fluctuations, and is easily affected by environmental conditions such as temperature, so it is difficult to control the amount of air in a stable and arbitrary manner. Therefore, the amount of liquid transferred. It was difficult to change the temperature arbitrarily and to improve the accuracy of the transfer amount.

In view of the above points, the present invention can arbitrarily change the liquid transfer amount or improve the accuracy of the liquid transfer amount in the pneumatic pump (pneumatic pump). The purpose is to provide the device.

(Structure 1)
An airtight container arranged so that at least a part thereof is lower than the liquid level of the liquid to be transferred, a liquid inflow portion for flowing the liquid to be transferred into the airtight container, and air (gas) from an air (gas) supply source. ) Inflow into the airtight container, and a liquid discharge section for discharging the liquid to be transferred in the airtight container by increasing the pressure due to the inflow of air (gas) from the air (gas) inflow portion. The airtight container is provided with a liquid sealing portion that reduces the pressure in the airtight container by breaking the liquid seal due to the decrease in the liquid level of the transfer target liquid in the airtight container due to the discharge of the liquid to be transferred. A liquid transfer device that transfers the transfer target liquid by repeating the inflow of the transfer target liquid and the discharge of the transfer target liquid, and is a cycle detection unit that detects the inflow and discharge cycle of the transfer target liquid, and the cycle. A liquid transfer device including a control unit that outputs a control signal for controlling the air (gas) supply source so that the discharge cycle detected by the detection unit becomes a predetermined number of times in a predetermined period. ..

(Structure 2)
The discharge amount in one cycle is stored in advance, and the required number of cycles within a predetermined period is calculated based on the discharge amount in the one cycle for the setting of the transfer amount per unit time for the input unit, and the air ( The liquid transfer apparatus according to configuration 1, wherein a control signal for controlling a gas) supply source is output.

(Structure 3)
An airtight container arranged so that at least a part thereof is lower than the liquid level of the liquid to be transferred, a liquid inflow portion for flowing the liquid to be transferred into the airtight container, and air (gas) from an air (gas) supply source. ) To the airtight container, and a liquid discharge part to discharge the liquid to be transferred in the airtight container by increasing the pressure due to the inflow of air (gas) from the air (gas) inflow part. The airtight container is provided with a liquid sealing portion that lowers the pressure in the airtight container by breaking the liquid seal due to the lowering of the liquid level of the transfer target liquid in the airtight container due to the discharge of the liquid to be transferred. A liquid transfer device that transfers the transfer target liquid by repeating the inflow of the transfer target liquid and the discharge of the transfer target liquid. Provided with a control unit that outputs a control signal for controlling the air (gas) supply source so as to stop or suppress the air (gas) supply when the state in which the liquid seal is broken is detected. A liquid transfer device characterized by.

(Structure 4)
The liquid transfer device according to any one of configurations 1 to 3, wherein the cycle detection unit or the state detection unit is composed of a pressure sensor or a water level sensor.

(Structure 5)
The step of inflowing air (gas) from an air (gas) supply source into the airtight container to raise the internal pressure and discharging the liquid to be transferred, and the liquid seal is broken after discharging a certain amount of the liquid to be transferred, and the airtight container is said. A liquid transfer method for transferring a liquid to be transferred by repeating a step of lowering the internal pressure inside and a step of flowing the liquid to be transferred into the airtight container as the internal pressure in the airtight container decreases. Liquid transfer characterized in that the cycle of inflow and discharge of the liquid to be transferred is detected, and the inflow of air (gas) from the air (gas) supply source is controlled so that the cycle becomes a predetermined number of times in a predetermined period. Method.

(Structure 6)
The step of inflowing air (gas) from an air (gas) supply source into the airtight container to raise the internal pressure and discharging the liquid to be transferred, and the liquid seal is broken after discharging a certain amount of the liquid to be transferred, and the airtight container is said. A liquid transfer method for transferring a liquid to be transferred by repeating a step of lowering the internal pressure inside and a step of flowing the liquid to be transferred into the airtight container as the internal pressure in the airtight container decreases. A liquid transfer method characterized in that a state in which a seal is broken is detected, and in the state in which the liquid seal is broken, the inflow of air (gas) from the air (gas) supply source is stopped or suppressed.

According to the liquid transfer device and the liquid transfer method of the present invention, in order to detect the cycle of liquid inflow and discharge and control the air inflow from the air supply source so that the cycle becomes a predetermined number of times in a predetermined period. It is possible to arbitrarily change the liquid transfer amount or to improve the accuracy of the liquid transfer amount.

The figure which shows the outline of the liquid transfer apparatus of Embodiment 1 which concerns on this invention. The figure explaining the operation cycle of the liquid transfer apparatus of Embodiment 1. A flowchart showing a processing operation according to the present invention of the liquid transfer device of the first embodiment. Graph showing pressure fluctuation in the liquid transfer apparatus of Embodiment 1. The figure which shows the outline of another example of the liquid transfer apparatus which concerns on this invention. The figure which shows the outline of the liquid transfer apparatus of Embodiment 2 which concerns on this invention. A flowchart showing a processing operation according to the present invention of the liquid transfer device of the second embodiment. A flowchart showing a processing operation according to the present invention of the liquid transfer device of the third embodiment. The figure which shows the structure which adjusts the transfer amount of a liquid transfer apparatus mechanically.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. It should be noted that the following embodiment is an embodiment of the present invention, and does not limit the present invention to the scope thereof.

<Embodiment 1>
FIG. 1 is a diagram showing an outline of the configuration of the liquid transfer device according to the first embodiment of the present invention.
The liquid transfer device 10 of the present embodiment is the above-mentioned pneumatic pump.
An airtight container 11 arranged so that at least a part thereof is lower than the liquid level of the liquid to be transferred (in the present embodiment, the whole is submerged under the liquid level).
A liquid inflow section 12 that allows the liquid to be transferred to flow into the airtight container 11 and
An air inflow section 13 that allows air supplied from the air supply source (blower 50) to flow into the airtight container 11 and
A liquid discharge unit 14 that discharges the liquid to be transferred in the airtight container 11 as the pressure rises due to the inflow of air from the air inflow unit 13.
A water seal portion 15 that reduces the pressure in the airtight container 11 by breaking the water seal due to a decrease in the liquid level of the liquid to be transferred in the airtight container 11 due to the discharge of the liquid to be transferred.
A cycle detection unit 16 that detects the inflow and discharge cycles of the liquid to be transferred, and
A control unit 17 that outputs a control signal for controlling the air supply source (blower 50) is provided so that the number of discharge cycles detected by the cycle detection unit 16 becomes a predetermined number of times in a predetermined period.

The airtight container 11 may be of any material and shape as long as it can allow a predetermined volume of liquid to be transferred to flow into the container and has a predetermined strength (strength that can withstand an increase in water pressure from the outside or an increase in internal pressure). Etc. are not particularly limited. As described below, in the liquid transfer device 10, the liquid to be transferred flows into the airtight container 11 through the liquid inflow portion 12 due to the head pressure. Therefore, the airtight container 11 is the liquid level of the liquid to be transferred. Arranged so that at least part of it is below the level.

The liquid inflow section 12 can allow the liquid to be transferred to flow into the airtight container 11, and causes an unintended pressure drop due to leakage of air supplied into the airtight container 11 from the liquid inflow section 12. Anything that does not have In FIG. 1, the liquid inflow portion 12 is “one end connected to the airtight container 11 and the other end is“ a predetermined length (more than the protruding height of the liquid discharge portion 14 on the liquid surface) from the liquid level at which the water seal is broken. ) Although the one formed by the "inflow pipe that opens below" is shown, as shown in FIG. 5, the liquid inflow portion 12 may be formed by a check valve or the like.

The air inflow section 13 may be any as long as it can allow air from the air supply source (blower 50) to flow into the airtight container 11.
In the present embodiment, the blower 50 is taken as an example of the air supply source, but the air supply source may be any as long as it can supply air to bring the inside of the airtight container 11 to a predetermined pressure (for example, a compressor or the like). It does not necessarily have to be "air", but may supply some kind of gas).

The liquid discharge unit 14 and the water seal unit 15 can discharge the liquid to be transferred in the airtight container 11, and the water seal is maintained according to the fluctuation of the liquid level in the airtight container 11 (a state in which the water seal is maintained. The state in which the internal pressure of the airtight container 11 is maintained high) and the state in which the airtight container 11 is torn (the airtight container 11 is communicated with the atmospheric pressure) may be repeated. In FIG. 1, the liquid discharge portion 14 is formed by "a discharge pipe in which one end is connected to the lower part of the airtight container 11 and the other end is opened at a liquid transfer destination (the transfer destination is omitted in the drawing)". Is shown. Further, the water sealing portion 15 is composed of "a U-shaped pipe having one end connected to the liquid discharge portion 14 (discharge pipe) and the other end connected to the airtight container 11".

FIG. 2 is a diagram illustrating an operation cycle of the liquid transfer device 10.
Step 1: Liquid transfer (Fig. 2 (a))
When air is supplied into the airtight container 11, the internal pressure thereof rises, the liquid to be transferred in the airtight container 11 is pushed out, and the liquid to be transferred is discharged from the liquid discharge unit 14, so that the liquid is transferred. Will be done.
Step 2: U-shaped tube water sealed (Fig. 2 (b))
When the liquid to be transferred in the airtight container 11 is pushed out and the liquid level is lowered and this reaches the vicinity of the lower end of the U-shaped pipe (water sealing portion 15), the water sealing of the U-shaped pipe is broken, which causes the airtight container 11 to be opened. Communicate with atmospheric pressure.
Step 3: Liquid inflow (Fig. 2 (c))
The water seal of the U-shaped tube (water seal portion 15) was broken, and the airtight container 11 communicated with the atmospheric pressure (the internal pressure of the airtight container 11 decreased). It flows into the airtight container 11.
Step 4: U-shaped pipe sealing (Fig. 2 (d))
When the liquid level in the airtight container 11 rises due to the inflow of the liquid to be transferred and reaches a height at which it flows into the U-shaped pipe (water sealing portion 15), the U-shaped pipe (water sealing portion 15) is filled with the liquid and sealed. Be watered.
The liquid transfer device 10 transfers the liquid by repeating the above operation cycle.

The cycle detection unit 16 is a sensor that detects the above-mentioned operation cycle, and in the present embodiment, the cycle detection unit 16 is composed of a pressure sensor provided in the air inflow unit 13.
FIG. 4 is a graph showing an example of pressure fluctuation in the airtight container 11 of the liquid transfer device 10 (pressure fluctuation based on atmospheric pressure (0). Here, for simplification, only static pressure is considered. , Ignored dynamic pressure). In the example here, it is assumed that the operation cycle is 1 minute and the liquid level in the airtight container is at a position of about 50 cm below the water surface.
In the above-mentioned step 1, the pressure in the airtight container 11 gradually increases (the pressure in the airtight container 11 becomes higher than the atmospheric pressure by the difference in height between the liquid level in the discharge pipe and the liquid level in the airtight container 11).
In step 2, the liquid level in the airtight container 11 is at the lowest position and the pressure is also the highest immediately before the U-shaped tube is completely sealed. When the air begins to escape from the U-shaped tube, the air suddenly escapes, so the pressure also begins to drop sharply.
In step 3, the internal pressure inside the airtight container 11 becomes substantially atmospheric pressure.
In step 4, the pressure remains almost atmospheric pressure until the U-shaped pipe is sealed, and after the water is sealed, the pressure inside the airtight container 11 begins to rise, and the process returns to step 1.
The cycle detection unit 16 which is a pressure sensor is a sensor that detects the above pressure fluctuation.

The control unit 17 is composed of a microcomputer, a dedicated IC, or the like, detects an operation cycle based on the pressure detected by the cycle detection unit 16 which is a pressure sensor, and makes the operation cycle a predetermined number of times in a predetermined period. A control signal for controlling the air supply source (blower 50) (in this embodiment, a signal for turning on / off the blower 50) is output. For example, in a device in which the discharge rate at one time is 5 L (determined by the configuration of the airtight container 11 and the U-shaped tube), when the transfer capacity of 5 L / min is provided, one cycle of operation is performed per minute. , The air supply source (blower 50) is controlled. The simplest example is to turn the air source on and off so that there is only one operating cycle per minute.
FIG. 3 is a flowchart showing an example of such a processing operation.

When the operation of the liquid transfer device 10 is started by turning on the power or the like, the timer function of the control unit 17 starts timing and turns on the air supply source (blower 50) (steps 301 and 302).
In step 303, it waits for the pressure obtained from the cycle detection unit 16 to exceed the predetermined value 1, and in the subsequent step 304, it is determined that the pressure falls below the predetermined value 2. The processes of steps 303 and 304 detect pressure rise and fall in the operation cycle described above. Based on the example of FIG. 4, for example, the predetermined value 1 is set to 4 (kPa) and the predetermined value 2 is set to 1 (kPa) to detect the state in which one discharge is completed. is there.

When it is determined that one discharge has been completed by the above process, the air supply source (blower 50) is turned off (step 304: Yes → step 305), and the timer returns to step 301 after a predetermined period has elapsed. The above process is repeated (step 306). The "predetermined period" is 1 minute in the above example (when a device having a discharge rate of 5 L at one time has a transfer capacity of 5 L / min), and is a preset value. is there.

As described above, according to the liquid transfer device 10 of the present embodiment, the cycle of liquid inflow and discharge is detected, and the air inflow from the air supply source is controlled so that the cycle becomes a predetermined number of times in a predetermined period. Therefore, it is possible to improve the accuracy of the liquid transfer amount.

FIG. 5 shows a liquid transfer device 20 suitable for circulation of sewage between an anaerobic tank and an aerobic tank in a septic tank for removing biological nitrogen. The same reference numerals are used for the same configurations as the liquid transfer device 10 of FIG.
The liquid transfer device 20 includes two airtight containers 11 and 11'of different capacities that communicate with each other by a common air inflow unit, and one airtight container has a liquid discharge unit 14 and a water seal unit 15 (U-shaped tube). Is provided, and only the liquid discharge portion 14'is provided in the other airtight container 11'. With this configuration, different transport volumes can be achieved while synchronizing the operation cycles.
In the septic tank for removing biological nitrogen, there are some suitable conditions for the amount of transfer circulated between the anaerobic tank and the aerobic tank. For example, in the septic tank for private homes, 5 L from the anaerobic tank to the aerobic tank. If 4 L / min is sent from the aerobic tank to the anaerobic tank, the sewage treatment can be made highly efficient. Therefore, by arranging the airtight container 11 having a discharge capacity of 5 L in the anaerobic tank and the airtight container 11'with a discharge capacity of 4 L in the aerobic tank, and applying the control method of the present embodiment described above, it is relatively simple. Moreover, the inexpensive configuration makes it possible to perform highly accurate circulation.
The liquid transfer device according to the present invention can be used not only for water treatment but also for liquid transfer in various fields (for example, liquid transfer of chemicals).

<Embodiment 2>
FIG. 6 is a diagram showing an outline of the configuration of the liquid transfer device according to the second embodiment of the present invention. The same reference numerals are used for the same components as those in the first embodiment, and the description thereof will be omitted or simplified.

The liquid transfer device 30 of the present embodiment accepts the setting of the transfer amount per unit time by providing the input unit 18, and makes an arbitrary transfer amount (an arbitrary transfer amount equal to or less than the upper limit value based on the capacity of the blower 50). It is possible to operate.
The control unit 17 stores the discharge amount in one cycle in advance, receives the setting of the transfer amount from the user or the like, calculates the discharge cycle suitable for the transfer amount, and controls the air supply source based on this. It outputs a signal.
FIG. 7 is a flowchart showing an example of such a processing operation. The same reference numerals are used for those having the same processing concept as that of the first embodiment (FIG. 3), and the description here is omitted or simplified.

When the operation of the liquid transfer device 10 is started by turning on the power or the like, the set value of the transfer amount is acquired (step 701). The "acquisition of the set value of the transfer amount" here is to acquire the transfer amount already set in the memory of the control unit 17 by another process (process of accepting the setting from the input unit 18) or the like. Here, the setting of the transfer amount from the user or the like may be acquired from the input unit 18.

In the following step 702, a discharge cycle (the number of required cycles within a predetermined period) that matches the set value of the transfer amount acquired in step 701 is calculated, and the “predetermined time” and the “predetermined cycle” are set.
For example, if the device has a discharge capacity (discharge amount in one cycle) of 5 L and the set value of the transfer amount is 10 L / min, "predetermined time = 1 minute, predetermined cycle = 2" or "predetermined time". = 30 seconds, predetermined cycle = 1 "is calculated.
The calculation process may be calculated each time by a predetermined calculation, or by providing a table in which a "predetermined time" and a "predetermined cycle" corresponding to each transfer amount are set. It may be obtained from a table or the like.

Subsequently, the timer is started to turn on the blower air supply source (blower 50) (steps 301 and 302), and n is initialized (step 703). n is a variable for counting the number of cycles.
When one cycle is detected by steps 303 and 304, n is incremented (step 704), and it is determined whether or not n has reached the "predetermined cycle" (step 705).
If n has not reached the “predetermined cycle”, the process returns to step 303 and the above process is repeated (shift to the next cycle). On the other hand, when n reaches the "predetermined cycle", the blower air supply source (blower 50) is turned off (step 705: Yes → step 305), and the timer returns to step 301 after the predetermined period elapses. The above process is repeated (step 306).

As described above, according to the liquid transfer device 20 of the present embodiment, it is possible to improve the accuracy of the liquid transfer amount while arbitrarily changing the liquid transfer amount. That is, it is preferable because it enables accurate control of the transfer amount according to the set value.
Although one setting value is taken as an example here, a plurality of setting values may be set. For example, there may be a plurality of set values according to the season and the time zone, and the process may be such that the transfer amount is different depending on the season and the time zone.

<Embodiment 3>
FIG. 8 is a flowchart showing an outline of the processing operation of the liquid transfer device according to the third embodiment. The same reference numerals are used for those having the same processing concept as those of the first and second embodiments, and the description here is omitted or simplified. The configuration of the liquid transfer device is the same as that of the second embodiment.
The liquid transfer device of the present embodiment is a liquid transfer device that saves energy by reducing unnecessary air supply.
As can be understood from the description of the operation cycle described above, air supply is basically required only during the period when the water seal is closed, and there is no need to supply air during the period when the water seal is broken. The liquid transfer device of the present embodiment controls the air supply source so as to stop or suppress the air supply when the state in which the water seal is broken is detected by detecting the state in which the water seal is broken. Is what you do. The beginning of the "broken water seal" can be seen by the sudden drop in pressure. Therefore, the cycle detection unit 16 which is a pressure sensor also functions as a state detection unit for detecting a state in which the water seal is broken. As for the end of the "water seal is broken", the one determined by time is taken as an example here. That is, the "time until the liquid flows into the airtight container after the water seal is broken and the water is sealed again" is measured in advance, and the time based on this is set as the "predetermined time 2" in the following description. It is something to keep.

In FIG. 8, steps 701 to 304 are the same processes as in the second embodiment (FIG. 7).
When the pressure drop (that is, the water seal is broken) is detected by step 304, the air supply source (blower 50) is turned off (step 304: Yes → step 305), and the timer 2 is started (step 801). As a result, the air supply in the state where the water seal is broken is stopped, and the measurement of "the time until the liquid flows into the airtight container after the water seal is broken and the water is sealed again" is started.
In the determination of the predetermined number of cycles in the subsequent steps 704 and 705, if n has not reached the "predetermined cycle", the process proceeds to step 802 and the timer 2 waits until the predetermined time 2 elapses. As described above, the process waits for the passage of "the time until the liquid flows into the airtight container after the water seal is broken and the water is sealed again", and after the time has elapsed, the process returns to step 302 to supply air. The source (blower 50) is turned on and the above process is repeated (moving to the next cycle).
On the other hand, when n reaches the "predetermined cycle", the process proceeds to step 306, the timer waits for the predetermined period to elapse, and after the elapse of the predetermined period, the process returns to step 301 to repeat the above process.

As described above, according to the liquid transfer device of the present embodiment, energy saving can be achieved by reducing unnecessary air supply.
Here, the air supply source is stopped (the blower 50 is turned off) as an example, but the air supply source may be suppressed (lowered in output) from the operating state (power on / off). In some cases, it is more efficient to reduce the capacity while maintaining the on state than to turn it off, and in some cases, the life of the device may be shortened if the power is turned on and off repeatedly).

In each embodiment, as an example of controlling the air supply source, the blower (device itself for supplying air) is controlled to be turned on / off, but the present invention is not limited to this, and the inside of the airtight container 11 is used. Anything that can control the inflowing air will do. For example, an electric valve or a solenoid valve may be provided in the air inflow section 13 or the like to control the opening and closing of the motorized valve or the solenoid valve.
Further, in each embodiment, simple on / off control is taken as an example, but those that control the operating state of an air supply device such as a blower (control of the supply voltage to the motor, etc.), electric valves, and solenoid valves The amount of air supplied may be controlled by adjusting and controlling the opening degree. In the process illustrated in the embodiment, for example, when controlling "1 cycle per minute", depending on the ability of the blower, "1 cycle ends in the first 10 seconds, and the remaining 50 seconds is in a stopped state". However, the output of the blower is appropriately reduced so that the liquid transfer is performed as uniformly as possible (in the above example, one cycle is exactly 1 minute). And so on.
When controlling the strength of such an air supply amount, it may be optimized by appropriately using feedback control such as PID.

Further, in each embodiment, a pressure sensor is used as an example of the cycle detection unit (or a state detection unit), but a water level sensor may be used. As is clear from the description of the operation cycle in FIG. 2, the cycle can be detected by measuring the water level of the airtight container or the like (when the water level sensor is used, the “water seal” in the third embodiment is possible. The end of the broken state can also be detected by the sensor). In addition, when the water seal is broken, air is blown out from the liquid discharge portion, so that noise and vibration are generated. A sensor (microphone or acceleration sensor) that detects these sounds and vibrations may be used as a cycle detection unit (or state detection unit).

In each embodiment, the liquid transfer device is submerged in the liquid to be transferred, but the liquid transfer device may be outside the liquid to be transferred (however, an airtight container). Must be placed below the level of the liquid to be transferred). Further, although the liquid discharge portion and the water seal portion are provided outside the airtight container as an example, these may be provided inside the airtight container.

In the present invention, the liquid transfer amount is arbitrarily changed by detecting the cycle of liquid inflow and discharge and controlling the air inflow from the air supply source so that the cycle becomes a predetermined number of times in a predetermined period. However, it is also possible to change the liquid transfer amount by adjusting the discharge amount at one time by a mechanical operation.
The "one discharge amount" is determined by the capacity of the airtight container and the height of the water seal by the U-shaped pipe (the height difference between the upper end (liquid inflow position) and the lower end of the U-shaped pipe). By making it adjustable, the transfer amount can be adjusted.
FIG. 9 shows an example of a structure in which the height of the water seal by the U-shaped pipe can be mechanically adjusted.
FIG. 9A shows a method of changing the height difference by tilting the U-shaped tube. This is an example in which the U-shaped tube can be tilted by providing the rotatable connecting portion 151.
FIG. 9B shows a method of changing the height difference by making the U-shaped tube expandable and contractible. This is an example in which the U-shaped tube can be expanded and contracted by providing a connecting portion 152 having a variable length to be received inside.
FIG. 9C shows a method of changing the height difference by bending a part of the U-shaped pipe as a flexible pipe. This is an example in which the U-shaped tube can be bent by providing the flexible tube 153.
When using a mechanical adjustment method for the U-shaped pipe as described above, it is better to provide the U-shaped pipe outside the airtight container, and the U-shaped pipe collects the liquid to be transferred. Workability is better if it is provided outside the tank.

10. .. .. Liquid transfer device 11. .. .. Airtight container 12. .. .. Liquid inflow part 13. .. .. Air inflow section 14. .. .. Liquid discharge part 15. .. .. Water seal (liquid seal)
16. .. .. Cycle detector (state detector)
17. .. .. Control unit 18. .. .. Input section

Claims (6)

An airtight container arranged so that at least a part of the liquid to be transferred is lower than the liquid level of the liquid to be transferred.
A liquid inflow section that allows the liquid to be transferred to flow into the airtight container,
An air inflow section that allows air from the air supply source to flow into the airtight container,
A liquid discharge unit that discharges the liquid to be transferred in the airtight container by increasing the pressure due to the inflow of air from the air inflow unit.
A liquid sealing portion that reduces the pressure in the airtight container by breaking the liquid seal due to a decrease in the liquid level of the liquid to be transferred in the airtight container due to the discharge of the liquid to be transferred.
It is a liquid transfer device that transfers the transfer target liquid by repeating the inflow of the transfer target liquid into the airtight container and the discharge of the transfer target liquid.
A cycle detection unit that detects the inflow and discharge cycles of the liquid to be transferred by detecting that the pressure exceeds the first threshold value due to the pressure increase and the pressure falls below the second threshold value due to the pressure decrease.
A control unit that outputs a control signal for controlling the air supply source so that the discharge cycle detected by the cycle detection unit reaches a predetermined number of times in a predetermined period.
A liquid transfer device comprising. The discharge amount in one cycle is stored in advance,
The feature is that the required number of cycles within a predetermined period is calculated based on the discharge amount in one cycle for the setting of the transfer amount per unit time for the input unit, and the control signal for controlling the air supply source is output. The liquid transfer device according to claim 1. An airtight container arranged so that at least a part of the liquid to be transferred is lower than the liquid level of the liquid to be transferred.
A liquid inflow section that allows the liquid to be transferred to flow into the airtight container,
An air inflow section that allows air from the air supply source to flow into the airtight container,
A liquid discharge unit that discharges the liquid to be transferred in the airtight container by increasing the pressure due to the inflow of air from the air inflow unit.
A liquid sealing portion that reduces the pressure in the airtight container by breaking the liquid seal due to a decrease in the liquid level of the liquid to be transferred in the airtight container due to the discharge of the liquid to be transferred.
It is a liquid transfer device that transfers the transfer target liquid by repeating the inflow of the transfer target liquid into the airtight container and the discharge of the transfer target liquid.
A state detection unit that detects the state where the liquid seal is broken, and
When the state detection unit detects that the liquid seal is broken, the control unit outputs a control signal for controlling the air supply source so as to stop or suppress the air supply.
A liquid transfer device comprising. Before SL state detection unit, the liquid transfer device according to claim 3, characterized in that it is constituted by a pressure sensor or level sensor. A step of inflowing air from an air supply source into an airtight container to raise the internal pressure and discharging the liquid to be transferred, and a step of breaking the liquid seal and lowering the internal pressure in the airtight container after discharging a certain amount of the liquid to be transferred. A liquid transfer method for transferring the liquid to be transferred by repeating the step of flowing the liquid to be transferred into the airtight container as the internal pressure in the airtight container decreases.
By detecting that the pressure exceeds the first threshold value due to the pressure increase and the pressure falls below the second threshold value due to the pressure decrease, the cycle of inflow and discharge of the liquid to be transferred is detected, and the cycle is predetermined. A liquid transfer method characterized in that the inflow of air from the air supply source is controlled so as to be a predetermined number of times in a period. A step of inflowing air from an air supply source into an airtight container to raise the internal pressure and discharging the liquid to be transferred, and a step of breaking the liquid seal and lowering the internal pressure in the airtight container after discharging a certain amount of the liquid to be transferred. A liquid transfer method for transferring the liquid to be transferred by repeating the step of flowing the liquid to be transferred into the airtight container as the internal pressure in the airtight container decreases.
A liquid transfer method characterized in that a state in which a liquid seal is broken is detected, and in the state in which the liquid seal is broken, the inflow of air from the air supply source is stopped or suppressed.

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