JPH0711280B2 - Vibrating column pumping device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention "Field of Industrial Application" The present invention relates to a vibrating column pumping device. More specifically, the present invention relates to a method for controlling the unique frequency of a vibration system including a pump and an air column / liquid column.

"Prior Art" Fig. 8 shows a vibrating column pump that has already been applied (Japanese Patent Application No. 57-0
28486 (JP-A-58-144700), which is a vertical cross-sectional view in which a lower end of a vibrating tube 3 which is a straight tube is opened and immersed in a liquid 2.
The upper end of the vibrating tube 3 is hermetically inserted into a valve casing 17 having a discharge port 18, is opened in the valve casing 17, and the other end of the spring 7 has one end abutting against a stationary portion and being repelled. 2 shows a vibrating column pump including a vibrating device 4 that presses the valve plate 8 that is in contact with the upper end of the vibrating tube 3 and vibrates the vibrating tube 3 in the longitudinal direction. In addition, Japanese Patent Application No.
-067668 (Japanese Patent Laid-Open No. 58-183900) has been applied for. In the invention after this, the lower end of the vibrating tube 3 is not directly submerged in the liquid, but the lower end of the stationary tube fixed in the liquid is submerged, and the upper end of the stationary tube is inserted through a sealing device which allows the vertical movement of the vibrating tube. It is different from the previous invention in that it is connected to the lower end of the vibrating tube. As a vibrating column pumping device other than the purpose of discharging the pumping liquid, there is a pumping device in which the valve device is not provided and a valve equivalent means is provided in the vibrating pipe.

"Problems to be solved by the invention" A vibrating column pump is a vibrating tube when the lower end of the vibrating tube is directly submerged in the liquid, and a stationary tube when the vibrating tube and the stationary tube are connected via a sealing device. And the vibrating tube becomes the suction tube.

In FIG. 8, when the vibrating device 4 is energized, the vibrating tube 3 moves up and down, the liquid rises in the vibrating tube 3, and finally the liquid flows between the valve plate 8 and the valve seat 9 at the upper end of the vibrating tube 3. Valve casing 17
It flows into the inside and is discharged from the discharge port 18. Such a pump action changes depending on the vibration condition of the vibration device 4, such as the vibration frequency and the vibration acceleration.

The manner in which the liquid rises in the suction pipe of the vibrating column pump is as follows. By vibrating the vibrating tube, pressure fluctuations occur in the air column inside the tube, and when the air column pressure exceeds the valve setting pressure at the top of the tube, the valve opens, gas in the tube flows out, and liquid in the tube rises. . This is repeated for each cycle of pressure fluctuation, and the liquid rises. The liquid rising phenomenon of such a vibrating column pump is accompanied by the resonance phenomenon of the air column / liquid column system in the pipe.
Therefore, when the vibration frequency that energizes the vibrating tube is close to the natural frequency of the gas column / liquid column system in the tube, a large fluctuation in air column pressure occurs with a relatively small vibration amplitude, and therefore the pumping is performed. easy. Therefore, the optimum vibration frequency for raising the liquid level in the suction pipe is the natural frequency of the air column / liquid column system in the pipe.

An oscillating system consisting of an air column and a liquid column in the pipe is composed of an oscillating column pump shown in FIG. 1 (a) and an air column G as shown by a weight W suspended via a spring S in FIG. 1 (b). Corresponds to the spring S, and the liquid column L corresponds to the weight W. As can be seen from FIG. 1 (a), depending on the height of the liquid surface in the vibrating tube 3, the spring constant k of the air column G in the tube is
The mass m of the liquid column L is different. Therefore, in-pipe air column G and liquid column L
The natural frequency of the system greatly changes depending on the height of the liquid surface in the vibrating tube 3. Ideally, if the vibration frequency is changed according to the liquid level in the vibrating tube 3 and the vibration frequency is always the natural frequency of the air column / liquid column system in the tube, the vibration force will be the minimum. The liquid can be raised with. However, this method makes the device complicated and expensive. If the liquid can be raised to the upper end of the tube with a constant vibration frequency, the device will be simple and inexpensive. Moreover, it is important for an actual machine that the vibration force is as small as possible and that the liquid can be pumped with a single vibration frequency.

The present invention changes the optimum vibration frequency with a very simple and inexpensive method to reduce the change in the optimum vibration frequency with respect to the liquid level in the pipe, and to obtain a single vibration frequency with a small vibration frequency. An object of the present invention is to provide a vibrating column pumping device that can raise the liquid level by force.

[Structure of Invention]

"Means for Solving Problems" The present invention relates to a pumping device having a vibrating device for longitudinally vibrating a vibrating tube whose lower end communicates with the liquid. It is a vibrating column pumping device in which a plurality of communication openings, which are arranged at appropriate places in the longitudinal direction of a pipe wall and open toward the inside of a vibrating pipe, communicate with corresponding air chambers.

"Action" In order to arbitrarily change the natural frequency of the air column / liquid column system in the pipe, which corresponds to the optimum pumping vibration frequency, the air column volume corresponding to the spring S or the mass m of the weight W is equivalent. It is necessary to control the volume of the liquid column that operates.

In the present invention, the volume of the air column is rapidly changed by the height of the liquid level in the tube by providing the opening communicating with the air chamber in the tube wall, and the natural frequency of the air column / liquid column system in the tube is changed. Was set to be almost constant with respect to the liquid level in the tube.

[Examples] Examples of the present invention will be described below with reference to the drawings. FIG. 2 is a vertical sectional view. The lower end of the vibrating tube 3 is submerged in the liquid 2 in the water tank 1, and the vibrating tube 3 is fixed and supported by the vibrating rod 5 of the output portion of the vibrating device 4 which is fixed. The upper end of the vibrating tube 3 is in contact with a valve plate 8 which is pressed by a spring 7 which is in contact with a spring seat 6 having one end fixed to form a valve seat 9. Air chambers 10, 11, 12 are fixedly installed at several places on the wall surface of the vibrating tube 3, and the inside of the vibrating tube 3 and the respective air chambers 10, 11, 12 are communicated with each other through a communication port 13 through the wall surface. .

The vibration device 4 may have a constant vibration frequency and a constant vibration acceleration. Also, the number of air chambers is not limited to three, and each air chamber 10,1
The sizes of 1, 12 may be different so as to be suitable for the operation described later.

Although FIG. 3 shows another embodiment, while the air chamber is fixedly installed on the wall surface of the chamber moving tube in FIG. 2, one end of the pipe 14 is connected to the communication port 13 on the wall surface of the vibrating tube in this embodiment. Fixed on the pipe
The other end of 14 is connected to a fixed air chamber 10 or 11 via a flexible tube 15. In this embodiment, there are two air chambers, but the number of air chambers is not limited to two, and the sizes are not necessarily the same. Since the air chambers 10 and 11 are separately fixed in this embodiment, there is an advantage that the power for energizing the vibrating tube 3 by the vibrating device 4 can be smaller than that in the embodiment of FIG.

The operation of the air chamber will be described with reference to FIG. The example of FIG. 4 is the case where there are two air chambers. FIG. 4 (a) shows when the liquid level in the vibrating tube 3 is lower than the communication port 13 to the lower air chamber 10, and the volume of the air column in the tube in this case is the volume of the air column only in the vibrating tube 3. If V ₀ , the volume of the air chamber 10 is V ₁ , and the volume of the air chamber 11 is V ₂ , then V = V ₀ + V ₁ + V ₂ . Therefore, the spring constant of the vibration system in the pipe becomes a value corresponding to this air column volume V, and since this spring constant is smaller than when the air chambers V ₁ and V ₂ are not added, the natural frequency of the vibration system in the pipe is The (optimum pumping vibration frequency) is lower than when there is no air chamber. Fig. 4 (b)
Is the case where the liquid level in the pipe is higher than the upper wall of the communication port 13 of the lower air chamber 10, and in this case the volume of the air column in the pipe is V = V ₀ + V ₂ , and the communication port 13 of the lower air chamber 10 At the moment when the liquid level in the pipe crosses the upper wall, the volume of the air column suddenly decreases by V ₁ minutes. Therefore, the spring constant in the pipe rapidly increases, and the optimum pumping frequency of the pumping liquid also increases. In FIG. 4 (c), since the liquid level in the pipe is above the upper wall of the communication port 13 of the upper air chamber 11, the volume of the air column in the pipe becomes V = V ₀ , and the spring constant further increases. Thus, the air chamber attached to the wall surface of the vibrating tube has the effect of greatly changing the spring constant of the in-pipe vibrating system according to the position of the liquid surface in the tube.

FIG. 5 (a) shows the height Y of the liquid level in the vibrating tube 3 of the conventional vibrating column pump shown in FIG. 8 from the liquid level in the water tank 1 as the horizontal axis and the vertical axis as the vertical axis. FIG. 6 is a diagram showing changes in the spring constant k of the air column G and the mass m of the liquid column L. As shown in FIG. 5 (a), the mass m changes in proportion to the liquid level height in the pipe (reference of the open liquid level of the liquid 2 in the water tank 1, the same applies below) Y, but the spring constant k is a quadratic curve. Becomes Therefore, the natural frequency of the vibration system in the pipe Varies depending on the liquid level height Y. In order to make the natural frequency f constant with respect to the liquid level height Y, as shown in the diagram of FIG. 5 (b) at the same coordinates as in FIG. 5 (a), the spring constant k is set to k '. Therefore, it is necessary to change the characteristics to be proportional to the liquid level height Y.
In this way, the natural frequency is m = aY, k ′ = bY, where a and b are proportional constants. Is a constant value regardless of the liquid level height Y. In FIG. 5 (c), the liquid level height Y is plotted on the horizontal axis, and the spring constants k and k'are set.
It is the diagram which showed the difference (DELTA) k of this on the vertical axis. That is, Δk
If the spring constant of is removed, the excitation frequency can always be made equal to the natural frequency. In practice, the spring constant corresponds to the volume of the air column in the tube, so to decrease the spring constant by Δk, the volume of the air column may be increased by the corresponding volume. Also, the fifth
From FIG. 7C, it can be seen that the volume may be increased at the portion where the liquid level Y is small and the portion where the liquid level Y is large, that is, at the upper and lower portions of the vibrating tube 3.

Two air chambers are shown in Fig. 6 and Fig. 7, respectively (Fig. 3).
And the theoretically calculated values of the optimum vibration frequency when attached at three locations (Fig. 2) are shown. In the figure, the horizontal axis is the liquid level Y, and the vertical axis is the optimum vibration frequency. The solid line shows the case where the air chamber is not attached, and the broken line shows the case where the air chamber is attached.

6, Y ₁ is the height from the liquid surface of the water tank 1 on the upper wall of the communication port 13 of the air chamber 10 in FIG. 3, and Y ₂ is the liquid of the water tank 1 on the upper wall of the communication port 13 of the air chamber 11. The height from the surface, and the height of the liquid column Y ₁ , Y
_The optimum excitation frequency offset occurs in each of the _two , and the optimum excitation frequency changes in the direction of leveling as a whole.

In FIG. 7, Y ₁ and Y ₃ are the same as in FIG. 6, but the height Y ₂ from the liquid surface of the upper wall of the communication port 13 of the air chamber 11 is the same as in FIG. It is between the height Y ₃ of the upper wall of the communication port 13 from the liquid surface of the water tank 1 and the above Y _1, and the difference Δk of the spring constant can be made small in the portion where the liquid surface height is low, so it is even more optimal vibration. The change in frequency is small.

It can be seen that when the air chamber is attached in this manner, the change in the optimum vibration frequency is suppressed in a wide range of the liquid level height Y, and the value becomes almost constant.

The above explanation is about the example of the vibrating column pump in which the vibrating tube moves up and down in the liquid of the water tank, but as in the conventional technology, the lower end of the stationary pipe fixed in the liquid is sunk and the It goes without saying that a vibrating column pump of the type in which the upper end is connected to the lower end of the vibrating tube via a sealing device that allows the vertical movement of the vibrating tube is included.

The present invention can be applied not only to a vibrating column pump, but also to any pumping device that causes changes in a liquid column by causing an air column and a liquid column in a vibrating tube. With the device added to the pipe, the structure shown in FIGS. 2 and 3 can be used to pump the liquid, and the liquid level control device for controlling the liquid level in the water tank 1 by controlling the liquid level in the vibrating pipe 3 can be applied. It is a thing. That is, all the devices for pumping the liquid by vibrating the pipe in which the air column and the liquid column are present in the longitudinal direction are included.

〔The invention's effect〕

This invention relates to a pumping device having a vibrating device for longitudinally vibrating a vibrating tube having a lower end communicating with the liquid, and a plurality of communicating ports communicating with the air chamber at appropriate places on the tube wall of the vibrating tube. With this, the optimum vibration frequency (natural frequency of the vibration system in the suction pipe), which was originally largely changed depending on the liquid level in the pipe, can be improved to a substantially constant value. It is possible to pump liquid with a single vibration frequency and a small amplitude.
Furthermore, this effect results in a low cost device. Also, the second
Similar effects can be obtained even when the suction pipe is formed of the vibrating portion and the stationary portion other than the suction pipe formed of only the vibrating pipe as shown in FIGS. INDUSTRIAL APPLICABILITY The present invention can be applied when the natural frequency of a mechanical device including an air column / liquid column system is arbitrarily changed in addition to a vibrating column pump.

[Brief description of drawings]

1 (a) and 1 (b) are explanatory views of a vibration model in the suction pipe of a vibrating column pump, FIGS. 2 and 3 are longitudinal sectional views of an embodiment of the present invention, and FIG. 4 is an action of an air chamber. 5 is a vertical sectional view showing
Figures (a), (b) and (c) are diagrams showing changes in the spring constant and mass of the vibration system in the suction pipe with respect to the liquid level in the pipe, and Figs. 6 and 7 show the effects of the present invention. FIG. 8 is a theoretical calculation diagram, and FIG. 8 is a longitudinal sectional view of a conventional example. 1 ... water tank, 2 ... liquid, 3 ... vibration tube, 4 ... excitation device, 5 ... excitation rod, 6 ... spring seat, 7 ... spring, 8 ...
Valve plate, 9 ... Valve seat, 10,11,12 ... Air chamber, 13 ... Communication port, 14 ... Pipe, 15 ... Flexible tube, 17
…… Valve casing, 18 …… Discharge port.

Claims (2)

[Claims] 1. A pumping device having a vibrating device for longitudinally vibrating a vibrating tube having a lower end communicating with the liquid, wherein a plurality of air chambers are provided, and an appropriate location in the longitudinal direction of the vibrating tube wall. A vibrating column pumping device in which a plurality of communication openings arranged in the vibration tube and opening toward the inside of the vibration tube are connected to the corresponding air chambers. 2. The vibrating column pumping device according to claim 1, wherein the plurality of air chambers have different sizes.