JP2008233023A - Displacement volume measuring device of liquid vessel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive displacement volume measuring device capable of determining the delivery termination accurately even when especially liquid level is not stabilized, or liquid such as drain water of large viscosity is used. <P>SOLUTION: This displacement volume measuring device comprises a siphon tube having an inverse U-shaped part penetrating a side wall of a liquid vessel, a half-U-shaped protective tube that projects from the side wall of the liquid vessel and surrounds a part inside the liquid vessel of the siphon tube, a water level determining means to be turned on or off in response to the delivery of the siphon tube, and a counter means for recording the frequency of the ON/OFF. Liquid is delivered by siphon action when the liquid level in the vessel reaches the upper end of the siphon tube, and the liquid flow rate is measured by recording the output of the water level determining means with the counter means. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an improvement of a simple drainage measuring device suitable for use in a liquid container open to the atmosphere such as a drain storage tank.

  In the compressor drain water treatment device or the like, the drained water from the drain generation source is temporarily stored in the storage tank, so that the purification treatment is performed by gradually passing through the treatment device. In this drain water treatment device evaluation test, it is necessary to provide a simple wastewater amount measuring device for the purpose of grasping the amount of treated water. It was thought that the amount of drain water accumulated in the storage tank could be measured at regular intervals, but it required manual labor, and the amount of drain water increased and could overflow from the container, so a simple automatic drainage measuring device was required. It was done.

In JP-A-5-322625, as a conventional technique, liquid is allowed to flow into a container equipped with a siphon tube and accumulated, and when the liquid level reaches the upper end of the siphon tube, the liquid is discharged by siphon action. A siphon tube type flow meter is described in which the flow rate is measured by detecting the number of discharges and the discharge interval of the siphon tube. In addition, in order to deal with measurement errors caused by the inflow of liquid while the liquid is being discharged from the siphon tube, a plurality of liquid containers are provided, each provided with a siphon tube, and the weight of the discharged liquid is reduced. An improved siphon tube type flow meter is disclosed in which a seesaw mechanism that operates in this manner is provided so that the inflow destination of a newly flowing liquid is switched to another container.
Japanese Patent Laid-Open No. 5-322625

  The siphon tube type flow meter described in Patent Document 1 can measure the flow rate of a liquid without a power source and has a feature such that the water quality of the stored liquid can be visually observed, but in the case of a sticky liquid such as drain water, Even when the liquid level reached the lower end of the siphon tube, the discharge did not end easily, and the measurement could be affected. If the tube is made thicker, drainage at the end will be better, but there is a limit to the thickness of the tube due to its function as a siphon tube.

  In addition, when the above flow meter is adopted in the drain storage tank of the compressor drain water treatment device, the drain water originally has viscosity, and since the drain trap operates intermittently and the drain water flows in with the compressed air, In some cases, the liquid level fluctuated irregularly and the discharge from the siphon tube did not stop easily, making accurate measurement difficult. If the improved flow meter described in the above document 1 is employed, the influence of newly introduced drain water can be prevented, but it is expensive and impractical to always provide a plurality of liquid containers.

  Therefore, the present invention is an inexpensive siphon tube type flow meter that can be used for development and research purposes, etc., and can accurately terminate the discharge even when the liquid level is not stable or when the liquid is highly viscous such as drain water. An object of the present invention is to provide an improved drainage measuring device that can be determined.

  The invention according to claim 1 is such that a siphon tube having an inverted U-shaped portion penetrating the side wall of the liquid container and a portion of the siphon tube that is inside the liquid container projecting from the side wall of the liquid container. A semi-U-shaped protective tube, a water level determining means that is turned ON / OFF as the siphon pipe is discharged, and a counter means for recording the number of ON / OFF times are provided, and the liquid level in the container is the upper end of the siphon pipe. The above problem is solved by a wastewater amount measuring apparatus that measures the liquid flow rate by discharging the liquid by a siphon action and recording the output of the water level determination means by the counter means.

  In other words, the inventor has a double structure in which the periphery of the siphon tube is surrounded by a protective tube, and by providing a buffer zone that is not affected by the upper and lower sides of the liquid level, it affects the determination of the end of discharge even when the liquid level is not stable. It has been found that it can be avoided. This is because the liquid level at the opening of the protective tube is more stable than the surroundings, so when the liquid level drops to the lower end of the siphon tube, the opening of the siphon tube is drained immediately, and the discharge action is completed and stable. It is considered that the determination can be made. It is more preferable that the upper part of the protective tube has a closed structure without an opening and air is sealed inside the protective tube, since this enhances a buffering effect from the surroundings.

  According to a second aspect of the present invention, in the wastewater amount measuring apparatus according to the first aspect, the above-mentioned problem is solved by an apparatus in which a lower end of the siphon tube is cut obliquely. This is because the edge of the lower end opening of the siphon tube is slanted, and even in the case of a highly viscous liquid such as drain water, the air held inside the protective tube flows from the top of the opening edge. It is thought that water drainage at the end will be improved and more accurate measurement will be possible.

  In the container equipped with the siphon tube and the protective tube as described above, when the liquid level reaches from the upper end of the siphon tube, the liquid discharge is started by the siphon action, and at this time, the output of the water level determination means is ON. -Turn off. Since the ON / OFF times are recorded in the recording means, the discharge amount can be easily obtained by multiplying the discharge amount of one time by the number of discharge times.

  According to a third aspect of the present invention, in the wastewater amount measuring apparatus according to the first or second aspect, the water level determination means is a float switch, and the storage means is an electronic counter operated by a battery. By adopting such a configuration, it is possible to obtain a device that does not require an external power supply, and for example, it can be easily installed for evaluation of a drain water treatment device under development.

  Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing the whole of a drainage amount measuring apparatus according to the present invention used for an evaluation test of a drain treatment apparatus, and FIG. 2 is an enlarged sectional view of the liquid discharging means. In the figure, a liquid container 1 is a drain storage tank for temporarily storing drain water discharged from a drain generation source of an air compressor pipe through a drain trap, and an upper part thereof is open to the atmosphere. A siphon tube 2 having an inverted U-shaped portion is provided so as to penetrate the side wall of the liquid container 1, and an inner end 2 a is opened at an appropriate height L in the liquid container 1. The inner end 2a of the siphon tube 2 is cut obliquely. The siphon tube 2 extends outside the liquid container 1 longer than the inside, and its tip 2b opens into another liquid container provided for measuring the amount of drainage. The uppermost part 2c of the siphon tube 2 is at a position passing through the side wall, and its central axis is at the height of H.

  A semi-U-shaped protective tube 3 is provided so as to protrude from the side wall of the liquid container 1 so as to surround the entire portion of the siphon tube 2 inside the liquid container 1. The lower end 3b of the protective tube 3 is at substantially the same height L as the end portion 2a of the siphon tube. The upper end 3a of the protective tube 3 is closed by the side wall of the liquid container 1, and is kept substantially airtight.

  To construct this dual structure drainage means, it seems easy to manufacture the protective tube 3 first. A semi-U-shaped protective tube 3 having an appropriate height is made of a strong material such as stainless steel and fixed to the side wall of the liquid container by means of welding or the like. Then, a hole 1a corresponding to the thickness of the siphon tube is opened at the center of the upper end 3a of the protective tube 3, and a siphon tube 2 having a predetermined thickness made of a material such as a slightly flexible plastic is inserted. If the periphery of the hole 1a is fixed with a sealing material so that the end 2a at the tip of the siphon tube 2 is at the same height as the lower end 3b of the protective tube, the drainage means having a double structure is completed. .

  At different positions in the liquid container 1, a float switch 4 is provided that outputs an ON signal above and below it with an intermediate height between H and L as a reference height. A battery built-in type electronic counter 5 is connected to the float switch 4, and the output of the float switch 4 is monitored, and the counter is incremented by 1 each time the output is switched from ON to OFF.

  A procedure for measuring the amount of wastewater using the apparatus of this embodiment will be described. By intermittent operation of the drain trap connected to the drain generation source, drain water is ejected into the liquid container 1 and the liquid level gradually rises. At the same time, the liquid level in the siphon tube 2 where the end 2b is opened gradually rises, and when the liquid level reaches H, the siphon is caused by the water head difference between the liquid container 1 and the end 2b of the siphon tube. An effect | action arises and discharge of drain water is started. The drain water continues until the liquid level in the liquid container 1 drops to L and leaves the end portion 2a of the siphon tube. During this time, the liquid level falls below the reference height of the float switch 4, so the output to the electronic counter 5 is turned off and the count is incremented by one.

  In order to calculate the amount of drainage for a certain period, the display value of the count at the start and end is recorded, and the number of operations of the siphon tube during this period can be obtained by subtracting the count at the start from the count at the end. Since the drainage amount per time becomes a constant value depending on the shapes of the liquid container 1 and the protective tube 3, the total drainage amount within the period is calculated by measuring this in advance and multiplying the number of operations described above. Also, the drain generation rate can be obtained by dividing the total amount of drainage by the elapsed time.

  According to the present invention, it is possible to provide an inexpensive drainage measuring device that can accurately determine the end of discharge even when the liquid level is not stable or in the case of a highly viscous liquid such as drain water. It can be used effectively.

It is whole explanatory drawing at the time of using the waste_water | drain amount measuring apparatus which concerns on this invention for the evaluation test of a drain treatment apparatus. It is an expanded sectional view of the liquid discharge means of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid container 2 Siphon tube 2a Inner end 2b Outer end 2c Top 3 Protection tube 3a Upper end 3b Lower end 4 Float switch 5 Electronic counter

Claims (3)

A siphon tube having an inverted U-shaped portion penetrating the side wall of the liquid container, and a semi-U-shaped protective tube projecting from the side wall of the liquid container and surrounding a portion of the siphon tube inside the liquid container; The water level determination means provided at a height that is turned ON / OFF with the discharge of the siphon tube and the storage means for storing the number of ON / OFF times are provided, and the liquid level in the container reaches the upper end of the siphon tube. A drainage amount measuring device that sometimes discharges liquid by siphon action and measures the liquid flow rate by recording the output of the water level determination means with a counter means. The drainage amount measuring apparatus according to claim 1, wherein an inner end portion of the siphon tube is cut obliquely. The waste water amount measuring apparatus according to claim 1 or 2, wherein the water level determination means is a float switch, and the storage means is an electronic counter operated by a battery.

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