JPH0344239B2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] "Industrial application field" This invention relates to a pump.

``Prior Art'' FIG. 9 is a longitudinal cross-sectional view of an embodiment of a vibrating column pump (Japanese Patent Application No. 57-067668) which has already been filed by the applicant. In the figure, the upper end of a stationary tube 2 whose lower end is stationary upright in the liquid and whose lower part is a large diameter portion is sealed and connected to the lower end of the vibrating tube 5 through a sealing device 6 that allows the vibrating tube 5 to vibrate. The upper end of the vibrating tube 5 is hermetically inserted into a valve casing 11 provided with a discharge port 9, and a spring 15, which opens in the valve casing 11 and whose one end is in contact with an immovable part and is resilient, is inserted into the valve casing 11. This figure represents a vibrating column pump equipped with an excitation device 7 that holds a valve plate 14 in contact with the upper end of the vibrating tube 5 at its end and vibrates the vibrating tube 5 in the longitudinal direction. In addition, the applicant filed the patent application No. 57-028486 earlier than the application related to the above-mentioned invention.
There is a vibrating column pump named No. 1, in which the lower end of the vibrating tube is directly submerged in the liquid and does not have a stationary tube.

"Problems to be Solved by the Invention" Conventionally, in vibrating column pumps, increasing the diameter of the suction pipe (static pipe, vibrating pipe) can reduce piping loss in the suction pipe, and in other applications, large-sized It has the advantage that it can also be used for priming pumps. However, if the cross-sectional area of the suction pipe is large, the vibration of the vibrating pipe will easily generate surface waves on the liquid level in the pipe, and the vibration force will be consumed in exciting the surface waves, making it impossible to raise the liquid column. There was a flaw that would go away.

Like a vibrating column pump, the pipe 5a is vertically erected with respect to the open liquid surface 1 (the 10th pipe has a liquid surface inside the pipe).
(See Figure) When vertical vibration is applied, surface waves 21' (see Figure 11) are generated on the liquid level 21 in the pipe due to the vibration mode based on the fluid system in the pipe, and depending on the vibration conditions, severe liquid level fluctuations occur. An uproar ensues.

By the way, the self-feeding phenomenon of a vibrating column pump occurs when the pressure fluctuation of the gas in the suction pipe increases.
This method utilizes the phenomenon in which the gas in the tube flows out when the tube opens, and the liquid in the tube rises accordingly (see Fig. 12). Therefore, in order to improve the self-sufficiency performance, it is necessary to open the valve plate 14 widely to allow a large amount of gas to flow out.To do this, it is necessary to generate as large a pressure fluctuation as possible in the gas in the suction pipe by pipe vibration. It is important to This pressure fluctuation is caused by the 13th
As shown in the figure, when the vibration system within the suction pipe can be considered as a spring 22-mass 23 system, the resonance frequency reaches its maximum. In other words, when the liquid in the vibrating tube 5 becomes a single mass and moves up and down inside the tube, this liquid column can be regarded as just a mass, so the vibration system in the suction tube treats the gas as a spring and the liquid column as a mass. is replaced by a simple spring-mass system. In other words, the liquid moves inside the suction pipe like a piston, causing a change in volume of the gas inside the pipe.

However, when a surface wave 21' as shown in Fig. 11 is generated, even though the liquid moves, the total volume of gas in the pipe does not change and the pressure of the gas does not fluctuate, so the liquid cannot rise into the suction pipe. becomes impossible.

The object of the present invention is to eliminate the above-mentioned drawbacks and improve the suction efficiency of the vibrating column pump by providing a vibrating column pump that does not generate surface waves on the liquid surface in the suction pipe.

[Structure of the invention]

``Means for Solving the Problems'' In order to prevent surface liquid in the suction pipe of a vibrating column pump, an embodiment of the present invention includes a float on the liquid level in the suction pipe that allows liquid to pass through the suction pipe. It is floating.

Also, for the same purpose, the lower part of the suction pipe is made up of pipes with small cross-sectional areas that are assembled into a single vibrating pipe in the upper part.

The gist of this invention is that in a vibrating column pump, the liquid level in the suction pipe is divided into sections (including one section), and the liquid surface area of each section is made smaller than the suction pipe diameter so that surface waves are less likely to occur. be.

``Operation'' A vibrating column pump with a float floating on the liquid surface of the suction pipe that allows liquid to pass through the suction pipe does not generate surface waves within the suction pipe.

If the lower part of the suction pipe is made up of a plurality of collecting pipes with a small cross-sectional area and assembled into a single vibrating pipe, one of the collecting pipes has a small liquid surface area, so no surface waves are generated.

That is, the effect of the present invention is that surface waves are not generated on the liquid surface of the divided small area inside the suction pipe of the vibrating pipe.

"Embodiments" Examples of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view.

A stationary tube 2 whose lower end is submerged below the open liquid surface 1 and whose lower end is an enlarged tube with a large diameter portion open at both ends is fixed to a fixed bracket 3 via a connector 4. The pipe-shaped vibrating tube 5 is connected to the static tube 2 by a sealing device 6 such as a flexible joint to the connector 4.
and are connected watertight. The vibrating tube 5 is supported so as not to be allowed to move in the vertical direction by an output section 8 of a vibrating device 7 installed on a stationary part that generates vibration by rotating a rotating body having an unbalanced weight, for example. The vibration excitation device 7 is not limited to one, but one that generates vibration in the vertical direction is a vibration device.

The upper part of the vibrating tube 5 passes through a fixed valve casing 11 which is at least container-shaped and is provided with a discharge port 9 . The vibration pipe 5 is the valve casing 1
The part through which the bellows 1 is inserted is sealed so that the vibrating tube 5 can vibrate in the longitudinal direction of the tube.For example, the inner diameter side of the bellows is fixed to the vibrating tube 5, and the outer diameter side is fixed to the valve casing 11. 12.

In the valve casing 11, the end of the vibrating tube 5 protrudes to an intermediate position. A valve plate 14 contacts the end of the vibrating tube 5 as a valve seat 13, and a spring 15 is compressed and inserted between the valve plate 14 and the valve casing 11.

In the large diameter portion of the stationary tube 2, a donut-shaped float 16 as shown in a perspective view in FIG. 2 is suspended on the liquid level within the tube. The size and shape of the float 16 are such that surface waves do not occur on the liquid level in the tube, which is a section, and the large diameter part of the stationary tube 2 needs to rise as the liquid level in the tube rises and falls. Therefore, when the liquid level in the tube rises, it is necessary that the liquid does not enter the small diameter part of the stationary tube 2. The material of the float 16 is not limited. Float 16
When the liquid hits the upper end of the large diameter portion of the stationary tube 2, it is necessary that the small diameter portion of the stationary tube 2 is not closed and the liquid can rise inside the stationary tube 2. Therefore, the float 16 is shaped like a donut and the center Has holes.

When the vibration device 7 is energized, the output section 8 moves up and down,
The vibrating tube 5 is moved up and down.

The behavior of the pump action is as follows.

When the valve plate 14 is vibrated so as to follow the vibrating tube 5 ○A Rising process of liquid level The vibrating tube 5 is moved up and down so that the valve plate 14 follows the vibrating tube 5 and moves. As the air column pressure inside the tube fluctuates, the liquid level inside the tube also moves up and down. This vertical movement of the liquid level is accompanied by the vibration phenomenon of a type of spring-mass system consisting of the elasticity of the air column and the mass of the liquid column.Therefore, since the damping due to friction etc. is small, the vertical movement of the vibrating tube 5 is When the frequency is set to the natural frequency of the air column-liquid column system inside the tube, the pressure in the air column inside the tube becomes extremely high. Therefore, if the valve is opened above a certain set pressure, the valve will open when the air column pressure in the pipe exceeds the valve's set pressure, and the upper limit of the air column pressure will be maintained at the valve set pressure, which will cause vibration. The average value of the air column pressure per cycle becomes less than atmospheric pressure, and the liquid column rises corresponding to the decrease in pressure. This happens continuously and the liquid level is raised to 5 in the vibrating tube.
rises to the top of the

○B Liquid discharge process After the liquid level reaches the upper end of the vibrating tube 5, due to the inertial force acting on the liquid column in the tube from the vibrating tube 5,
The liquid column pushes up the valve plate 14 and the liquid flows out from the upper end of the vibrating tube 5.

When the valve plate 14 is vibrated so as to move without following the vibrating tube 5 (Figs. 3 and 4) ○B When the vibrating tube 5 moves downward in Fig. 3, the valve plate 14 does not follow this but moves downward with a delay, and at the upper end, the vibrating pipe 5 and the valve plate 1
There is a slight gap between 4. At this time, the air inside the vibrating tube 5 escapes to the top.

○B When the vibrating tube 5 reaches its lower limit, the valve plate 14 catches up and closes the valve seat 13, as shown in FIG.

○C Vibrating tube 5 with the valve port closed by the valve plate 14
When the pressure rises, the air in the vibrating tube 5 and the stationary tube 2 expands, the pressure in both tubes decreases, and the liquid level in the tubes rises (FIG. 5).

When the vibrating tube 5 further descends, the vibrating tube 5
The liquid in the stationary tube 2 does not drop much due to the inertia of the liquid. Therefore, at this time as well, gas is discharged to the upper part, the pressure inside the vibrating tube 5 and the static tube 2 decreases, and the liquid rises.

Due to this action, pressure fluctuations caused by the vibrating tube 5 or the valve plate 14 are transmitted into the liquid when the liquid is full, and into the gas when the liquid is not full, creating a standing wave of pressure in the gas or liquid. However, in the pressure standing wave, the fluctuating pressure is large at the valve plate 14 and decreases at the lower part of the stationary pipe 2, so liquid or gas escapes from between the valve plate 14 and the valve seat 13 to the upper part. Similarly, by repeating the conditions ○A to ○B, the liquid will eventually reach the upper end of the vibrating tube 5, and as the vibrating tube 5 descends as shown in FIG. 3, the liquid will overflow into the valve casing 11. , valve casing 11
The liquid starts to flow from the inside toward the discharge port 9, and then the liquid is pumped up and discharged.

Due to such a pumping action, when a liquid level is generated in the static tube 2 and the vibrating tube 5 vibrates, if there is a liquid level in the large diameter part of the static tube 2 and the liquid in the tube is under conditions that generate surface waves, vibration will occur. A part of the energy vibrating the tube 5 is dissipated for the generation of the surface waves. However, due to the presence of the float 16, the liquid level in the tube is narrowed so as not to generate surface waves, so no surface waves occur.

FIG. 6 is a longitudinal sectional view of another embodiment of the present invention, and FIG. 7 is a perspective view of the outer periphery taken along the line AA in FIG. 6. The horizontal cross section of the large diameter portion of the stationary tube 2 is partitioned like a lattice so that a plurality of tubes 17 having small cross-sectional areas are assembled.

At the upper end of the large diameter portion of the stationary tube 2, a part of the tube wall at the upper end of the small tube 17 is made to protrude so as to reach the boundary wall 18 between the large diameter portion and the small diameter portion of the stationary tube 2, and serves as a wave shield 19. In this example, the wave shield 19 is located at the diameter of the large diameter portion of the stationary tube 2.

According to this embodiment, the large diameter portion of the stationary tube 2 is the small tube 1.
Since it is divided into 7 parts, no surface waves are generated. Further, even when the liquid level reaches the space near the wall 18 at the boundary between the large diameter part and the small diameter part, no surface waves are generated because there is a wave shield 19.

The embodiment describes the case where the stationary tube becomes the expanding tube in the suction tube, but even if the vibrating tube and the stationary tube are equal, if the cross-sectional area of the tube is large, surface waves will occur, so such a case is also included in the present invention. Needless to say, this is a place where you can get lost.

The embodiment has described a vibrating column pump in which the lower end of the vibrating tube communicates with the water reservoir through the stationary tube, but if the lower end of the vibrating tube is not provided with a stationary tube and is directly immersed in the water reservoir, the longitudinal cross-sectional view of FIG. In this case as well, the function of the float 16 is the same as in the first embodiment, and in FIG. Good too.

As described above, in the present invention, when a float is floated by dividing the liquid level in the suction pipe of a vibrating column pump into one section, the liquid level in the pipe becomes a small area and surface waves are prevented. Also, if the suction pipe is a collection pipe of small pipes, the liquid level is small in the small pipes, so the generation of surface waves is prevented, and the part of the suction pipe that communicates from the large diameter part to the small diameter part is divided into two parts by a wave shield, and the surface area of the suction pipe is Since it is approximately half of the large diameter section of the pipe, generation of surface waves is prevented.
In this way, it is sufficient to be able to divide the liquid level inside the suction pipe and prevent the generation of surface waves by dividing it. Therefore, it is important that the liquid level inside the suction pipe is completely separated by a closed line. This does not necessarily mean that the liquid surface is separated, but it may have an opening that communicates between the separated liquid surfaces, as if it were a breakwater.

〔Effect of the invention〕

This invention is equipped with a member that divides the liquid level in the suction pipe of a vibrating column pump, and the surface area of one divided liquid level is smaller than the cross-sectional area of the upper part of the vibrating tube, so that the excitation force of the vibrating tube is reduced. We were able to prevent losses to a large extent. Moreover, it has become possible to raise the liquid level even in a suction pipe with a large diameter, which has hitherto been unable to raise the liquid level.

It is extremely easy to float the float in the suction pipe.

If a large number of small tubes are assembled to form the lower end of the suction tube, it can also function as a strainer.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the invention, FIG. 2 is a perspective view showing some parts of FIG. 1, and FIGS.
The figure is a longitudinal sectional view explaining the pump action of Fig. 1, Fig. 6 is a longitudinal sectional view showing another embodiment of the invention, and Fig. 7 is a perspective view below the section taken along line A-A in Fig. 6. 8 is a vertical cross-sectional view of still another embodiment of the present invention, FIG. 9 is a vertical cross-sectional view of a conventional example, and FIG.
Figures 1a and b are longitudinal sectional views to explain the problems of the conventional example, Figure 12 is a diagram showing the relationship between valve lift, generated pressure, and liquid pumping height, and Figure 13 is an explanation showing an equivalent vibration system. It is a diagram. DESCRIPTION OF SYMBOLS 1... Open liquid surface, 2... Stationary tube, 3... Bracket, 4... Connector, 5... Vibration tube, 6... Sealing device, 7... Vibration device, 8... Output section, 9... ...Discharge port, 11... Valve casing, 12... Sealing device, 13... Valve seat, 14... Valve plate, 15...
Spring, 16... Float, 17... Small tube, 18...
Wall, 19... Wave protection.

Claims (1)

[Scope of Claims] 1. A static tube whose lower end is connected directly or with a sealing device that allows vibration of the vibrating tube is a suction tube, and the upper end of the vibrating tube that communicates the suction tube into the liquid is a discharge port. In a vibrating column pump that is inserted into a valve casing equipped with an excitation device that opens in the valve casing and vibrates a vibrating tube in the longitudinal direction, and a valve plate with the upper end of the vibrating tube as a valve seat, A member for partitioning the liquid level in the suction pipe part is provided in the suction pipe part to partition the liquid level, and each partitioned liquid level has an area smaller than the cross-sectional area of the upper part of the vibrating pipe. vibrating column pump. 2. The vibrating column pump according to claim 1, wherein the member separating the liquid level is a float floating on the liquid level in the suction pipe section. 3. The vibrating column pump according to claim 1, wherein the member that partitions the liquid level is a plate that partitions the suction pipe portion in the longitudinal direction.