JPH01273883A - Pulsation buffer device in inlet pipe of reciprocating-pump - Google Patents

Abstract

PURPOSE:To accomplish effectively the pulsation cushioning of a fluid in an inlet pipe by connecting a reservoir, which has lots of compartments formed therein, to the inlet pipe of a reciprocating-pump to circulate a liquid to be handled in the compartments at the time of a pump's intake stroke. CONSTITUTION:A reservoir 30 is connected to an inlet pipe 18b near the inlet port 14 of a reciprocating-pump 12. This reservoir 30 has lots of liquid-tight compartments devided by lots of partitioning parts and communicated with one another at each different position. The ceiling of the reservoir 30 may be constructed to be open or sealed for making a uniformly-pressurizing hole in the upper part thereof.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pulsation damping device in a suction pipe of a reciprocating pump, and in particular, a device for damping pulsation within a suction pipe of a reciprocating pump.
The present invention relates to a pulsation damping device that reduces pulsation in a suction pipe by allowing a handled liquid to flow through the maximum number of chambers in a tank via a long way port that communicates between the chambers when the liquid is sucked in by a pump.

[Conventional technology]

Generally, reciprocating pumps have a suction stroke and a discharge stroke, and the discharge amount is zero in the suction stroke, and the suction amount is zero in the discharge stroke, so the flow rate fluctuates in both the suction piping and the discharge piping. As a result, the fluid pulsates.

However, cavitation occurs in the pump chamber due to pulsation, and abnormal vibrations occur in the piping.
This creates a problem that makes it difficult to read the pressure of the fluid.

Therefore, in order to improve these, Figs.
As shown in the figure, pulsation buffering methods such as the standpipe method, pressure equalization pipe method, and air chamber method that utilize gas pressure and piping resistance have been adopted.

That is, in the standpipe method shown in FIG. 8, the handled liquid supply tank 10 is opened to the atmosphere, and a standpipe 16 opened to the atmosphere is installed near the suction port 14 of the reciprocating pump 72 (hereinafter referred to as pump).
This is a method in which the pulsation in the suction pipe 18 is absorbed by the handling liquid filled in the upright pipe 16.

In addition, the pressure equalization pipe method shown in FIG.
The gas phase portion 22 of the hermetically sealed standpipe 20 and the gas phase portion 26 of the hermetically sealed supply tank 24 are sealed and installed near the pump suction port 14.
are connected by a pressure equalizing pipe 28, and the standpipe 20 is pressurized with equal pressure.
This is a method of absorbing pulsations in the suction pipe 18 using the liquid handled within the suction pipe 18.

Furthermore, the air chamber method shown in FIG.
The gas phase section 26 of the pump 12 is pressurized, and the suction port 1 of the pump 12 is pressurized.
4. Send pressurized air pressure from a high-pressure gas cylinder 29 to the gas phase part 22 of a sealed standpipe 20 installed near the sealed standpipe 2.
This is a method of absorbing pulsations in the suction pipe 18 by pressurizing the handled liquid inside the suction pipe 18.

In this case, at the measurement positions of point A and point B of the suction pipe 18 shown in FIGS. 8 to 9,
The large point lit a waveform is attenuated at point B and becomes a gentle pulsating waveform.

[Problem to be solved by the invention]

However, since the pulsation in the suction pipe still remains, the flow velocity fluctuates, and as a result, inertia resistance due to the pulsation remains at point B of the suction pipe. There is a drawback that poses a major hindrance when measuring.

Therefore, in the present invention, a tank is connected to the suction pipe near the suction port of the reciprocating pump, and a number of chambers are formed in the tank, each of which can be communicated with through a communication port, and when the pump suctions, the handled liquid is transferred to the top of the tank. By arranging communication ports so that water flows through multiple chambers, we have created a pulsation damping device in the reciprocating pump suction pipe that can effectively achieve stable pulsation-free characteristics at all times without pressurizing the tank. provide.

[Means to solve the problem]

A pulsation buffer device according to the present invention is a pulsation buffer device in a reciprocating pump suction pipe that is connected to a reciprocating pump suction pipe and reduces pulsations in the suction pipe that occur during suction of the reciprocating pump. The present invention is characterized in that a tank is connected near the suction port of the dynamic pump, and a number of liquid-tight chambers partitioned by a number of partitions are provided within the tank, and these multiple chambers communicate with each other in different positional relationships.

In addition, in the pulsating M impulse device in the reciprocating pump suction pipe,
The tank may have an open ceiling.

Furthermore, the tank may have a closed structure with pressure equalizing holes provided in the upper part.

However, it is preferable that the tank is configured with multiple partitioned rooms.

(Function) According to the pulsation buffer device in the reciprocating pump suction pipe according to the present invention, when the suction and discharge strokes are started by starting the reciprocating pump, the liquid feeding by the pump is alternately reduced to zero at both the suction port and the discharge amount. As a result, the flow rate changes rapidly in the suction and discharge piping, and as a result, the fluid pulsates. In this case, the tank is connected to the suction pipe near the pump suction port, and the handled liquid is flowed through the maximum number of chambers inside the tank through communication ports that have mutually different positional relationships. By allowing the fluid to pass through the suction pipe, pulsation of the fluid within the suction pipe can be effectively achieved.

〔Example〕

Next, embodiments of a pulsation damping device in a reciprocating pump suction pipe according to the present invention will be described in detail with reference to the accompanying drawings. For convenience of explanation, parts that are the same as those of the conventional structure shown in FIGS. 8 to 10 are given the same reference numerals, and the explanation thereof will be omitted.

FIG. 1 shows a first embodiment, reference numeral 30 in the figure.
indicates a cylindrical tank with the ceiling open to the atmosphere, and this tank 30
The inside of is partitioned by a tank 32 formed by a small diameter cylindrical tube,
A heavy cylindrical tube is constructed.

The outer chamber of the two chambers constituted by the double cylindrical pipe is connected in communication with a suction pipe 18atJ to which the handling liquid is supplied from the handling liquid supply tank 10 to the lower part thereof. Further, the small diameter cylindrical pipe 32 constituting the inner chamber is provided with a communication port 42 that communicates with the outer chamber, and this communication port 42 has a positional relationship with the connection ports 44 and 46 with the suction pipes 18a and 18b, respectively. are arranged differently. Furthermore, the suction pipe 18b connected to the piping connection port 46 is communicatively connected to the suction port 14 of the reciprocating pump 12.

The pulsation damping device configured in this way is installed at the pump suction port 1.
When the reciprocating pump is started by attaching it to the suction pipe 18b near the pump suction port 14, the liquid flows through the communication ports arranged at different positions in the tank as shown by the arrows.
The direction flows past. In this case, the liquid level in the tank 30° 32 is the same as the liquid level in the handling liquid supply tank 10 and shows a height H before the pump starts, and when the pump 12 starts, the liquid level in the tank 3
The liquid level at 0°32 is the liquid level ho in the inner chamber connected to the pump suction port 14, while the liquid level h1 in the outer chamber connected to the supply tank 10 is due to the lower suction pressure. Indicates high liquid level.

Therefore, it is clear that each liquid level satisfies l-1>hl>hg.

Next, each measurement position A in the tank 30, 32 shown in FIG.
When the pulsation is measured at each point B and C, the pulsation waveform shown in FIG. 2 is obtained, and it can be seen that the pulsation flow becomes smaller toward the inlet side of the tank. That is, according to the measurement results, the pulsation at point 0 (pulsation) is significantly attenuated, and a stable state with almost no pulsation is obtained. However, it is clear that the pulsation buffering effect will become more significant if the structure is further multilayered.Also, in the second embodiment shown in FIG.
The outer room, which also has a double structure, is the pump suction port 1.
4, and a small diameter cylindrical pipe 32 forming an inner chamber is connected to the supply tank 10 side.

In this case, the flow inside the tank is as shown by the arrow, in which the handling liquid supplied from the supply tank 10 flows into the small diameter cylindrical pipe 32 inside the tank, and then flows into the outer chamber through the communication port 48,50. , and flows out into the suction pipe 18b connected to the pump suction port 14 via the piping connection port 46. Therefore, the liquid level in the tank is opposite to that in the first embodiment in the inner and outer chambers.

Furthermore, in the third embodiment shown in FIG. 4, the tank is formed with a waste cylinder 36 whose ceiling is open to the atmosphere, and the inside is partitioned off by a partition 38.
It is divided into two tanks. 2 formed in the tank
Each of the two rooms has a suction pipe 18a on the side of the supply tank 10.
and is connected to the suction pipe 18b on the pump suction port side. Also,
A communication port 52 is provided in the partition portion 38 in the tank so as to have a positional relationship different from that of the respective connection ports 44 and 46.

In this case, the flow in the tank is such that the liquid level in the chamber on the outflow side is lower than the liquid level in the inflow side, as shown by the arrow.

Next, in the tanks shown in the fourth to sixth embodiments corresponding to FIGS. 5 to 7, respectively, the ceiling of the tank described above is connected to the lid 34.
The pressure equalizing holes 53 and 54 are provided in the upper portions of the lid 34 and the partition portions 32 and 38.

Therefore, only the above-mentioned configuration is different from the embodiment described above, and in other parts, FIG. 1 corresponds to FIG. 5, FIG. 3 corresponds to FIG. 6, and FIG. 4 corresponds to FIG. 7. Since each of them has the same configuration as described above, detailed explanation will be omitted.

Although the preferred embodiments of the present invention have been described above, the outer shape of the tank constituting the pulsation damping device of the present invention is not limited to a round or square shape, and the interior of the tank does not have only a multilayer structure. The room can be configured with a large number of irregularly shaped rooms depending on the arrangement of the partitions, and it goes without saying that in addition to the above-described embodiments, various design changes can be made without departing from the spirit of the invention.

〔Effect of the invention〕

As is clear from the embodiments described above, according to the present invention,
In a pulsation buffering device in a reciprocating pump suction pipe that is connected to a reciprocating pump suction pipe and reduces pulsations in the suction pipe that occur when the reciprocating pump suctions, a tank is connected to the suction pipe near the reciprocating pump suction port. The pulsation in the suction pipe can be greatly attenuated by providing a large number of liquid-tight rooms partitioned by a large number of partitions in this tank and communicating with each other at different positions. As a result, inertial resistance due to pulsating waves at the inlet of the tank can be ignored, and vibration of the piping due to pulsation can also be prevented.

Therefore, in this way, the pulsation in the reciprocating pump suction pipe can be significantly damped by the pulsation damper, so that a stable flow range is obtained, which allows the measurement of the flow rate in said pipe to be carried out using the general-purpose 70- With meters and electromagnetic flowmeters,
You can get the advantage of being able to do this with high precision.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a main part showing a first embodiment of a pulsation damping device in a reciprocating pump suction pipe according to the present invention, and FIG. A pulsation waveform diagram, FIG. 3 is a sectional view of a main part showing a second embodiment of the present invention, FIG. 4 is a sectional view of a main part of a third embodiment of the invention, and FIGS. The figure shows a pulsation prevention device according to the present invention having a sealed structure, FIG. 5 is a cross-sectional view of main parts showing a fourth embodiment according to the present invention, and FIG. 6 is a fifth embodiment according to the present invention. FIG. 7 is a cross-sectional view of the main part showing the sixth embodiment of the present invention, and FIGS.
The figure shows a conventional pulsation damping device, FIG. 8 is a system diagram for the standpipe method using the conventional pulsation damping device, and FIG. 9 is a system diagram for the pressurized pipe method using the conventional pulsation damping device. figure,
FIG. 10 is a system explanatory diagram relating to the air chamber method using a conventional pulsation damping device, and FIG. 11 is a pulsation waveform diagram when a conventional pulsation M shock device is used. 10... Handled liquid supply tank 12... Reciprocating pump 14... Suction port 16... Standpipe 'IS'
, 18a, 18b... Suction pipe 20... Sealed standpipe 22, 26... Gas phase part 24... Sealed supply tank 28... Pressure equalization pipe 29... High pressure gas cylinder 30-・Tank 32・...Small diameter cylindrical tube (tank) 34, 40...Lid 36.
... Square tube 38 ... Partition parts 42.42a, 42b, 48, 50.52 - ... Communication ports 44, 46 ... Connection port 53.54 ... Pressure equalization hole A, 8. C...Pulsating wave measurement position H...Liquid level ha before pump startup...Liquid level h1 in the inner chamber while pump is starting...
Liquid level in the outer room while the pump is running FIG, I FIG, 2 Encounter→Fio, 3 FIG, 4 FIG, 5 FIo 8 FIG, 9

Claims (4)

[Claims] (1) In a pulsation buffering device in a reciprocating pump suction pipe that is connected to a reciprocating pump suction pipe and reduces pulsations in the suction pipe that occur during suction of the reciprocating pump, a tank is provided in the vicinity of the reciprocating pump suction port of the suction pipe. A pulsation buffer in a reciprocating pump suction pipe characterized in that a number of liquid-tight chambers partitioned by a number of partitions are provided in the tank, and these multiple rooms communicate in different positional relationships. Device. (2) Claim 1 in which the tank is configured with an open ceiling.
A pulsation damper in the reciprocating pump suction pipe as described. (3) The pulsation damping device in a reciprocating pump suction pipe according to claim 1, wherein the tank has a sealed structure and has a pressure equalizing hole provided in the upper part. (4) The pulsation damping device in a reciprocating pump suction pipe according to any one of claims 1 to 3, wherein the tank is configured with multiple partitioned rooms.