JPH0735800B2 - Vibrating column pump - Google Patents

Description

The present invention relates to a vibrating column pump, that is, one end of which is immersed in water and the other end of which is in the air, and which is elastically contacted with a spring. The present invention relates to a pump in which a pipe (vibrating pipe), which is made to communicate with a discharge-side liquid guiding pipe via a valve plate, is vibrated in the longitudinal direction and the liquid is pumped through the pipe.

[Conventional technology]

Conventionally, in this type of vibrating column pump, the upper end of a pipe whose lower end is immersed in liquid and whose upper end is in the air is communicated with a discharge-side liquid guiding pipe via a valve plate elastically contacted by a spring. The pipe itself is vibrated in the longitudinal direction, and the liquid is pumped through the pipe (vibrating pipe) (for example, see JP-A-58-144700), or the lower end is in the liquid. The valve plate elastically contacted by a spring is brought into contact with the upper end of the vibrating tube whose upper end is hermetically inserted into the liquid guide tube having the discharge port and which is open in the liquid guide tube. Then, the vibrating tube is vibrated in the longitudinal direction and the liquid is pumped through the vibrating tube (Japanese Patent Application No. 63-421 previously filed by the applicants).
No. 23 (see Japanese Patent Laid-Open No. 1-219400).

However, this type of vibrating column pump is only provided with the liquid guiding tube in which the upper end of the vibrating tube is hermetically inserted as described above, and the vibrating tube is formed by one straight tube. It is considered to obtain the rise of discharge pressure by separating the vibration into two and causing vibrations of opposite phase to each other, and positively utilizing the interaction of the two vibrations and the change in the cross-sectional area of the connection part of the stationary pipe. It wasn't what it was.

[Problems to be Solved by the Invention]

When the vibrating column pump as described above operates as a circulation pump, the pressure in the vibrating pipe must be higher than the pressure in the liquid guiding pipe to open the valve. The valve will not open if it is larger than the maximum value of the pressure fluctuation generated just below the valve in the vibrating tube due to the vibration. Therefore, in order to perform the pump action at a high discharge pressure, it is important to make the amplitude of the pressure fluctuation generated in the vibrating tube as large as possible.

When the suction pipe of the vibrating column pump, that is, the pipe from the suction port to the upper end of the vibrating pipe is made of a single straight pipe with a constant inner diameter, the maximum pressure P directly below the valve in the vibrating pipe is P = Pa-ρH-ρg (L + x) (1) where Pa: atmospheric pressure ρ: density of liquid L: height from suction liquid surface to upper end of vibrating tube x: displacement of vibrating tube: of vibrating tube Acceleration g: Gravitational acceleration H: Total length of the suction pipe. When a realistic value is substituted and calculated, the value does not become too large. Further, in the vibrating column pump, when the pressure in the liquid guiding tube is constant, since the pressure can be taken out only up to the maximum pressure generated in the vibrating tube, the pump may be limited to use with a low head. was there.

The present invention has been made in view of the above-mentioned problems of the conventional technology, and an object thereof is to provide a vibrating column pump that can obtain a high discharge pressure with a simple structure.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention provides a vibrating tube having a lower end immersed in a liquid and an upper end elastically contacted with a vibrating tube opened in a liquid guide tube in a longitudinal direction. In a vibrating column pump equipped with vibrating means, the vibrating tube is divided into two parts, upper and lower, so that they vibrate in mutually opposite phases, which is compared to the case where there is one vibrating tube for the liquid column in the vibrating tube. To vibrate with a relative double amplitude, and also effectively utilize the flow path cross-sectional area sudden change portion between the vibrating tube and the stationary tube to determine the difference between the outer diameter of the vibrating tube and the inner diameter of the stationary tube. Is characterized in that the flow velocity fluctuation of the liquid in the stationary pipe is increased, and the maximum value of the pressure directly below the valve in the vibrating pipe can be greatly increased.

[Action]

Since the present invention is configured as described above, the pressure fluctuation generated in the vibrating tube during the closing of the valve due to the vibration in the longitudinal direction of the vibrating tube is usually in the same phase as the displacement of the vibrating tube.
Maximum pressure occurs when the highest position is reached.
At this time, if the pressure immediately below the valve in the vibrating pipe is greater than the internal pressure of the liquid guiding pipe, that is, the pipe portion (corresponding to the discharging casing portion) that guides the liquid discharged from the vibrating pipe through the valve to the discharge port. Satisfies the requirements for the valve to open.

In order to satisfy the above requirements, the present invention uses the following method (means). FIG. 1 (a) shows that the vibration pipe constituted by a single straight pipe is shortened and connected to a stationary pipe, and the suction passage cross-sectional area expansion portion (pipe diameter d ₂ Part) is formed, and the pressure (P) fluctuation immediately below the valve at this time is obtained as follows.

That is, the equations of motion of the liquid columns in the respective flow passages are as follows: −ρL ₁ = P−P ₁ + ρL ₁ g for a vibrating tube with a pipe diameter d ₁ (2) At the pipe end with a pipe diameter d _2a , When the put and Q ₂₎ to force the flow _{loss, -ρ 2 L 2 / a 2a} = P 1 -P 2 + ρL 2 g ...... (3) in the conduit tube diameter d _3a, similarly -ρ ₃ L ₃ / A _3a = P ₂ −P ₃ + ρL ₃ g (4) (where A _2a and A _3a represent the flow passage cross-sectional area, and “•” above the symbol represents the first derivative. On the other hand, the continuous formula is Q ₂ = Q ₃ (5) The above formulas (3), (4), and (5) are summarized as −ρ (L ₂ / A _2a + L ₃ / A _3a ). ₂ = P ₁ -P ₃ + ρ (L ₂ + L ₃ )
g (6) Since x ₂ = x, the transfer relationship between P ₁ and x in the above equation is Laplace transformed into P ₁ / x = −ρS ² (L ₂ + L ₃ A _2a / A _3a ). …… (7) Also, P / x = −ρS ² L ₁ + P ₁ / X …… (8) Substituting equation (7) into P / x = −ρS ² (L ₁ + L) ₂ + L ₃ A _2a / A _3a ) (9) where S is the Laplace operator.

In addition, as shown in FIG. 1 (c), in the conventional one in which the expanded portion of the suction flow passage cross-sectional area is not provided at the lower end portion of the vibrating tube made of a single straight pipe, the pipe vibration and the pressure directly below the valve are The transfer function is
By Laplace transform of equation (1), P / x = −ρHS ² −ρg where ρHS ² >> ρg, P / x = ρHS ² (1a) The above equation (9) and equation ( Compared with 1a), Fig. 1 (a)
As shown in Fig. 1 (c), there is a pipe connecting part with an enlarged flow path cross-sectional area, so that P / x is (L ₁ + L ₂ + L ₃ A _2a / A _3a ) / H times, and A _2a /
It can be seen that as A _3a is larger and L ₃ is longer than the other pipe lengths L ₁ and L ₂ , the pressure amplitude increases and a large pressure increase can be obtained.

As shown in FIG. 1 (a) above, as compared with the case where the vibrating tube is composed of a single straight tube with an enlarged portion of the flow passage cross-sectional area between the vibrating tube and the stationary tube, FIG. As shown in b), when the vibrating tube is divided into two parts, the upper part and the lower part, the result is as follows.

For a vibrating tube with a pipe diameter d ₀ , −ρl ₀ = P−P ₁ + ρl ₀ g (10) In the pipe with a pipe diameter d ₁ , neglecting flow loss Similarly for pipes with pipe diameter d _2. And so on The formula of continuity is Q ₁ = Q ₂ = Q ₃ = Q ₄ Formula (11) to (15) Here, the flow rate Q ₁ is set as ₁ = A _{1 1} − (A ₁ − A ₂ ) _{2 1} = − ₂ (opposite phase) Substituting into equation (16) Laplace transform of equation (10) and equation (17) However So finally For comparison with FIG. 1 (a), now _{temporarily, d 1a = d 0, d} 2a = d 1 = d 3, d 3a = d 4 = d 2, L 1 = l 0, L 2 = l ₁
+ L ₃ , L ₃ = l ₂ + l ₄ , Since A _2a = A ₃ and A _3a = A ₂ , the formula (20) is compared with the formula (9). Dimensionally ordinary Therefore, the formula (20) always has a larger value. That is,
By separating the vibrating tube into two parts, upper and lower, and vibrating in opposite phases, it is possible to increase the pressure fluctuation immediately below the valve in the vibrating tube.

〔Example〕

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

FIG. 2 is a vertical sectional view of a vibrating column pump showing an embodiment of the present invention.

In the figure, reference numeral 1 is a vibrating tube made of a magnetic material, and a plate-like valve 3 elastically repulsed by a spring 2 is press-contacted (elastically contacted) to the upper end of the vibrating tube 1 and a coil spring is applied to the lower end. Through 4,
The separated second vibrating tube 11 is inserted and elastically connected to each other. The same coil spring 4 is interposed at the lower end of the vibration tube 11 to elastically support the vibration tube 11.

An electromagnetic coil 5 is arranged outside the first vibrating tube 1, and a sinusoidal current is passed through the coil 5 to vibrate the first vibrating tube 1 in the longitudinal direction. Below the second vibrating tube 11, the stationary tube 6 is installed in the casing 7.
The stationary tube 6 has its lower end immersed in the liquid.

The casing 7 is internally provided with the electromagnetic coil 5 wound around the vibrating tube 1 in a ring shape, and a passage 7a for hermetically inserting the vibrating tube 1 is formed in the central portion. In 7a, the lower part communicates with the liquid through the stationary tube 6, and the upper part,
The liquid is discharged from the vibrating pipe 1 through the valve 3 and is communicated with a liquid guiding pipe 9 having a large inner diameter so as to be guided to the discharge port 8.
In the figure, 10 is a suction port.

Both the vibrating tubes 1 and 11 have a shortened axial length,
Between the lower end of the lower second vibrating tube 11 and the stationary tube 6, the suction flow expanding from the inner diameter d ₄ of the stationary tube 6 to the inner diameter d ₁ of the vibrating tube passage 7a corresponding to the outer diameter of the vibrating tube 11. An enlarged portion of the road cross-sectional area is formed.

If the natural frequency of the vibration system formed by the lower second vibrating tube 11 and the coil spring 4 is set lower than the exciting frequency of the upper first vibrating tube 1, the second vibrating tube 11 automatically vibrates in the opposite phase to the first vibrating tube 1. In the figure, the inner diameters of the vibrating tubes 1 and 11 are d ₀ , the same outer diameter (corresponding to the inner diameter of the vibrating tube passage 7a) is d ₁ , and the inner diameter of the stationary tube 6 is d ₄ .

Since it is configured as described above, as described in FIG. 1 (b) which is an explanatory view modeling the suction flow path of the embodiment of FIG. 1 The pressure P of the vibrating tube 1 just below the valve 3 has a magnification shown by the equation (21) as compared with the case where there is one vibrating tube (FIG. 1 (a)).

The above effects are obtained, for example, by L ₁ and L ₃ >> L ₂ , 3L ₁ = L ₃ , d _1a = d
_{When 3a} and d _2a = 1.5d _3a, it is about 1.5 times, and a large pressure increase is obtained.

〔The invention's effect〕

Since the present invention is configured as described above, it has the following effects.

The vibrating tube of the vibrating column pump, which has its lower end immersed in the liquid and whose upper end is elastically contacted and opened into the liquid guiding pipe, is shortened and sucked into the connection between the lower end of the vibrating pipe and the stationary pipe. An enlarged portion of the flow passage cross-sectional area is formed, and the flow passage cross-sectional area sudden change portion of the enlarged portion is effectively used to increase the fluctuation of the flow velocity of the liquid in the stationary pipe due to the difference between the outer diameter of the vibrating pipe and the inner diameter of the stationary pipe. In addition to the above, the vibrating tube is separated into upper and lower parts, and the upper and lower vibrating tubes vibrate in opposite phases to each other, thereby increasing the pressure fluctuation in the vibrating tube and increasing the discharge pressure. Obtainable.

[Brief description of drawings]

FIGS. 1 (a), (b) and (c) are suction flow path model diagrams for explaining the principle of pressure increase due to a change in flow path cross-sectional area of the present invention and a conventional example, and FIG. 2 is an embodiment of the present invention. 3 is a vertical cross-sectional view of the vibrating column pump shown in FIG. 1,11 ... Vibration tube, 2 ... Spring, 3 ... Valve, 4 ... Coil spring, 5 ... Electromagnetic coil, 6 ... Stationary tube, 7 ... Casing, 7a ... Vibration tube passage, 8 ... … Discharge port, 9 …… Conduit pipe, 10 …… Suction port.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hirokuni Hiyama 4-2-1 Motofujisawa, Fujisawa-shi, Kanagawa Prefecture EBARA Research Institute (72) Inventor Kazuyoshi Yamamoto 4-chome, Fujisawa, Kanagawa Prefecture No. 1 Incorporated EBARA Research Institute (72) Inventor Hiroyuki Hashimoto 8-12-16 Tsurugaya, Sendai City, Miyagi Prefecture (56) Reference JP-A-61-55378 (JP, A)

Claims (1)

[Claims] 1. A vibrating tube having a lower end communicating with a liquid and an upper end hermetically inserted into a liquid guiding tube having a discharge port and having an opening in the liquid guiding tube, and one end at an immovable portion. The vibration plate is provided with a valve plate that is in contact with the upper end of the vibrating tube at the other end of the spring that abuts and repels, and a vibrating unit that vibrates the vibrating tube in the longitudinal direction. In a vibrating column pump having a structure in which a stationary pipe is attached to the lower end of the pipe, an enlarged portion of the suction flow passage cross-sectional area is formed between the vibrating pipe and the stationary pipe, and the enlarged portion is used effectively to make the outer diameter of the vibrating pipe. The difference between the inner diameter of the stationary tube and the inner diameter of the stationary tube increases the flow velocity fluctuation of the liquid in the stationary tube, and the above-mentioned vibrating tube is separated into upper and lower parts, and the upper and lower vibrating tubes vibrate in opposite phases. A vibrating column pump characterized by increasing the fluctuation so that a higher discharge pressure can be obtained.