JP2665367B2 - Vibrating column pump - Google Patents

Description

The present invention relates to a vibrating column pump, that is, one end is immersed in water, the other end is arranged in the air, and the other end is elastically connected by a spring. The present invention relates to a pump that vibrates in a longitudinal direction a pipe (vibrating pipe) that communicates with a discharge-side liquid guide pipe through a valve plate, and pumps liquid through the pipe.

[Conventional technology]

Conventionally, this type of vibrating column pump connects the upper end of a pipe, whose lower end is immersed in a liquid and whose upper end is arranged in the air, to a discharge-side liquid guide pipe through a valve plate elastically contacted with a spring. The above-described pipe itself is vibrated in the longitudinal direction, and liquid is pumped through the pipe (vibrating pipe) (for example, see JP-A-58-144700).
A valve whose lower end communicates with the liquid and whose upper end is spring-contacted with the upper end of a vibrating tube which is hermetically inserted into a liquid guide tube having a discharge port and which is open in the liquid guide tube. The plate is brought into contact with the vibrating tube so as to vibrate in the longitudinal direction, and the liquid is pumped through the vibrating tube.
63-42123).

However, these conventional devices are not of a structure or shape that is designed to actively control the back pressure of the valve plate that is elastically contacted with the upper end of the vibrating tube by a spring.

[Problems to be solved by the invention]

The operation process when the vibrating column pump as described above is used as a circulation pump can be roughly divided into a suction process and a discharge process when compared with a two-valve piston pump. In this case, in the vibrating column pump, the liquid guide tube corresponds to the cylinder of the piston pump, and during the descending process of the vibration tube, the valve is opened and the liquid in the vibration tube flows into the liquid guide tube. On the other hand, during the upward movement of the vibrating tube, the valve closes and the liquid in the liquid guide tube is pushed out from the discharge port by the action of the piston of the vibrating tube.

By the way, in order for the liquid in the vibration tube to flow into the liquid guide tube, the pressure in the vibration tube must be larger than the pressure in the liquid guide tube and the valve must be opened. The valve is not opened if it is larger than the maximum value of the pressure fluctuation generated immediately below the valve in the vibrating tube due to the directional vibration. That is, in the two-valve piston pump, the discharge side valve closes during the suction process to shut off the discharge pressure, so that the discharge side pressure is not applied to the suction side valve, and the discharge side The conditions have no effect. However, in the vibrating column pump, since both the suction and discharge processes are performed by only one valve, the condition on the discharge side affects the operation of the valve.

Therefore, in the vibrating column pump, there is a problem that a discharge pressure larger than the maximum value of the pressure fluctuation in the vibrating tube cannot be obtained.

The present invention has been made in view of the above-mentioned problems of the related art, and has as its object to provide a vibrating column pump capable of obtaining a high discharge pressure with a simple structure.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a vibrating tube having a lower end immersed in a liquid and an upper end resiliently connected to the vibrating tube opened in the liquid guide tube in a longitudinal direction. In a vibrating column pump provided with a vibration means, an accumulator is attached in the middle of a discharge pipe following the liquid guide pipe, and vibration of a standing wave of pressure pulsation of a pipe system formed by the pipe to the liquid guide pipe and the accumulator is provided. It is characterized in that the mounting position of the accumulator is adjusted so that the number substantially matches the frequency of the vibration tube.

(Operation)

Since the present invention is configured as described above, the pressure fluctuation generated in the vibrating tube during closing of the valve due to the longitudinal vibration of the vibrating tube is usually in the same phase as the displacement of the vibrating tube. Pressure develops when the tube reaches its highest position. At this time, the internal pressure of the liquid guide tube, that is, the pipe portion (corresponding to the discharge casing portion) that opens the valve from the vibrating tube and guides the liquid discharged to the discharge port is smaller than the pressure immediately below the valve in the vibrating tube. This satisfies the requirements for the valve to open.

In order to satisfy the above requirements, the present invention uses the following method (means). That is, by mounting an accumulator having a sufficiently large capacity in the middle of the discharge pipe following the liquid guide pipe, the pressure in the discharge pipe at the mounting position is always constant. In such a state, the standing wave of pressure pulsation generated in the pipe between the liquid guide pipe and the accumulator becomes an antinode in the liquid guide pipe when the valve at the top of the vibrating pipe is closed, and the accumulator mounting position is limited. Becomes Therefore, the pressure in the liquid guide pipe fluctuates greatly, and even when the pressure in the liquid guide pipe without the accumulator is higher than the maximum pressure immediately below the valve in the vibrating pipe, the minimum value of the pressure change in the liquid guide pipe is:
The pressure can be lower than the pressure immediately below the valve in the vibration pipe.

Also, in general, near the frequency of the standing wave, the phase of the pressure change with respect to the excitation displacement changes rapidly from 0 degrees to 180 degrees, so adjust the length of the conduit from the liquid introduction pipe to the accumulator. By changing the frequency of the standing wave, the phase of the highest pressure immediately below the valve in the vibration pipe and the phase of the minimum pressure in the liquid guide pipe can be matched. With this configuration, the liquid in the vibrating tube is discharged to the liquid guide tube at the time of the minimum pressure, so that the average pressure of the discharge side pressure (average pressure over one cycle of vibration) is higher than the highest pressure generated immediately below the valve in the vibrating tube. , The discharge flow rate can be obtained.

〔Example〕

 Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a longitudinal sectional view of a vibrating column pump device showing one embodiment of the present invention.

In the drawing, reference numeral 1 denotes a vibrating tube made of a magnetic material, and a plate-shaped valve 3
Is pressed (elastic contact), and a coil spring 4 is interposed at the lower end to elastically support the vibration tube 1 at a neutral position. An electromagnetic coil 5 is disposed outside the vibrating tube 1, and the vibrating tube 1 is caused to vibrate in the longitudinal direction by passing a sinusoidal current through the coil 5. A stationary pipe 6 is fixed to the casing 12 below the vibrating pipe 1, and a lower end of the stationary pipe 6 is submerged in the liquid.

The casing 12 is provided such that the electromagnetic coil 5 is wound around the vibrating tube 1 in a ring shape, and a central portion thereof includes:
A passage 12a for sealingly inserting the vibrating tube 1 is formed,
The lower part of the passage 12 a communicates with the liquid through the stationary pipe 6, and the upper part receives the liquid discharged from the vibrating pipe 1 through the valve 3 through the discharge port 10.
To the liquid guide tube 11 having a large inner diameter so as to guide the liquid to the liquid guide tube 11.

A discharge pipe 9 is connected to a discharge port 10 of the liquid guide pipe 11, and an accumulator (air chamber) 7 is provided at a position of a length L from the liquid guide pipe 11 in the middle of the discharge pipe 9. Further, the discharge pipe 9 is connected to the upper tank 8, and therefore,
The pressure P _D of the mounting position of the accumulator 7 is always maintained in the head H ₀ (liquid level of the upper tank 8).

FIG. 2 shows a model of the pipeline system from the liquid introduction pipe 11 to the accumulator 7, wherein the vibrating pipe 1 and the valve 3 at the upper end (first
Figure) the piston 13, also the accumulator 7 head H ₀
, Respectively. In the figure, 14 is a straight pipe.

When the pressure fluctuation at the piston position in the above model is solved by the impedance method, the following is obtained.

H ₂ = 0, where γ: Propagation constant Z _C : Characteristic impedance of the pipe a: Sound velocity Q ₁ : Displacement (flow rate) of the vibrating pipe Q ₂ : Displacement (flow rate) at the (open position) of the open channel H ₁ , H ₂ : Head at position and at From the above formula (matrix), ∴H ₁ = −Z _C Q ₁ tanhγL If friction is ignored, The frequency of the resonance point is As described above, when the pressure fluctuation at the piston position in this model is solved by the impedance method, the equation (1) is obtained, and the resonance point is obtained when the frequency is ω = πa / 4L.

Further, as can be seen from equation (1), the phase of P ₁ (pressure fluctuation in the liquid guide tube) with respect to Q ₁ changes depending on the values of ω and L. Therefore, by arbitrarily selecting the value of L, ₁ that it is possible to control the phase of P ₁ against vibrating tube displacement.

Figure 3 is a pressure variation P ₁ in the liquid guiding pipe 11 obtained as described above, it is the pressure fluctuation P ₂ in the vibrating tube 1 which depicts schematically. If the height from the suction liquid level to the valve 3 is H when the vibrating tube 1 is stationary (FIG. 1), the pressure immediately below the valve in the suction tube including the stationary vibrating tube 1 is Pa-ρHg. (Pa:
Atmospheric pressure, ρ: density of liquid, g: gravitational acceleration)
When the vibrating tube 1 vibrates in the longitudinal direction, the pressure immediately below the valve in the vibrating tube fluctuates around (Pa−ρHg) as shown in the figure.

On the other hand, the pressure P ₁ in the liquid guide pipe 11 is equal to the discharge side pressure P _D
And fluctuates as shown in the figure. Therefore, the phase relationship vibrating pipe pressure P ₂ and the amplitude of the pressure fluctuation P ₁ in Shirubeekikan 11 is
It can be adjusted by adjusting the length L of FIG. As indicated by the shaded portion a ₀ in FIG. 3, the larger P ₂ is from P _1, the Tokiben 3 is opened, the liquid in the vibrating pipe 1 flows into the liquid guiding pipe 11. The liquid replenished in the liquid guide pipe 11 in this manner flows out of the discharge port 10 by a piston action in the process of raising the vibration pipe 1.

〔The invention's effect〕

Since the present invention is configured as described above, the following effects can be obtained.

A discharge pipe is connected to a discharge port of a liquid guide tube which is inserted and hermetically sealed by a vibrating tube whose lower end communicates with the liquid, an accumulator is connected in the middle of the discharge pipe, and the liquid guide tube and the following are connected. The length of the pipeline is selected so that the frequency of the standing wave of the pressure pulsation of the pipeline formed by the discharge pipe up to the accumulator matches the frequency of the vibrating tube. Causing a large pressure fluctuation in the liquid in the liquid conduit,
A discharge pressure larger than the maximum value of the pressure fluctuation in the vibrating tube can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a vibrating column pump showing one embodiment of the present invention, FIG. 2 is an analytical model of a pipe system from a liquid introducing pipe to an accumulator, and FIG. FIG. 3 is a diagram illustrating a temporal variation of a pressure in a liquid pipe. DESCRIPTION OF SYMBOLS 1 ... Vibration pipe, 2 ... Spring, 3 ... Valve, 4 ... Coil spring, 5 ... Electromagnetic coil, 6 ... Stationary pipe, 7 ... Accumulator, 8 ... Upper tank, 9 ... Discharge pipe , 10 ... discharge port, 11 ... liquid guide tube, 12 ... casing, 13 ... piston, 14 ... straight pipe, 15 ... water channel.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hirokuni Hiyama 4-2-1 Motofujisawa, Fujisawa-shi, Kanagawa Prefecture Within Ebara Research Institute, Inc. (72) Inventor Kazuyoshi Yamamoto 4-2-2 Motofujisawa, Fujisawa-shi, Kanagawa Prefecture No. 1 Inside Ebara Research Institute Co., Ltd. (72) Inventor Hiroyuki Hashimoto 8-12-16 Tsurugaya, Sendai City, Miyagi Prefecture

Claims (1)

(57) [Claims] 1. A vibrating tube having a lower end communicating with a liquid, an upper end hermetically inserted into a liquid guide tube having a discharge port and being open in the liquid guide tube, and one end connected to an immovable portion. In a vibrating column pump having a valve plate abutting on the upper end of the vibrating tube at the other end of the spring abutting and resilient, and a vibrating means for vibrating the vibrating tube in the longitudinal direction, An accumulator is connected in the middle of the connected discharge pipe. A vibration column pump characterized in that the mounting position of the accumulator is adjusted so as to correspond to the above, so that a large pressure fluctuation is caused in the liquid in the liquid guide tube.