WO1999056052A1 - Dispositif de reduction des pulsations d'un fluide - Google Patents

Dispositif de reduction des pulsations d'un fluide Download PDF

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Publication number
WO1999056052A1
WO1999056052A1 PCT/JP1999/002123 JP9902123W WO9956052A1 WO 1999056052 A1 WO1999056052 A1 WO 1999056052A1 JP 9902123 W JP9902123 W JP 9902123W WO 9956052 A1 WO9956052 A1 WO 9956052A1
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WO
WIPO (PCT)
Prior art keywords
pulsation
fluid
connection pipe
attenuator
container
Prior art date
Application number
PCT/JP1999/002123
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English (en)
Japanese (ja)
Other versions
WO1999056052A8 (fr
Inventor
Eiichi Kojima
Donghui Cao
Original Assignee
Hitachi Construction Machinery Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Construction Machinery Co., Ltd. filed Critical Hitachi Construction Machinery Co., Ltd.
Priority to JP55279199A priority Critical patent/JP3392879B2/ja
Publication of WO1999056052A1 publication Critical patent/WO1999056052A1/fr
Publication of WO1999056052A8 publication Critical patent/WO1999056052A8/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/04—Devices damping pulsations or vibrations in fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/0008—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators

Definitions

  • the present invention relates to, for example, a hydraulic pump, a pneumatic pump, a control valve, and the like, or a pipe such as a hydraulic pipe, a pneumatic pipe, and the like (hereinafter, a hydraulic pump, a pneumatic pump, a control valve, a pipe, and the like).
  • the present invention relates to a fluid pulsation reducing device suitable for use in reducing the pulsation of fluid generated in these fluid devices.
  • construction machines such as hydraulic shovels and hydraulic crane are provided with a pipeline for pumping hydraulic oil as a fluid, and a hydraulic pump as a hydraulic pressure source is connected to the pipeline.
  • a hydraulic pump as a hydraulic pressure source is connected to the pipeline.
  • the pressure oil discharged from the hydraulic pump is likely to generate a pulsation of the pressure oil whose pressure fluctuates due to the reciprocation of the piston of the hydraulic pump. Therefore, a fluid pulsation reducing device is provided on the discharge side of the hydraulic pump in order to reduce the pulsation of the pressurized oil.
  • reference numeral 1 denotes a hydraulic pump driven by a drive source (not shown) such as an engine.
  • the hydraulic pump 1 sucks hydraulic oil in the tank 2 and pressurizes the hydraulic oil.
  • Pressure oil is supplied to a hydraulic cylinder and other actuators 5 via a pipeline 3 for controlling the pressure and a control valve 4.
  • Reference numeral 6 denotes a side branch branched from the middle position of the pipeline 3, and the side branch 6 has a start end opening into the pipeline 3. It is connected by mouth and the terminal end is closed.
  • the length dimension L 0 of the side branch 6 satisfies the following equation 1 between the sound velocity c in the side branch 6 and the pulsation frequency F 0 of the pressure oil to be reduced. ing.
  • the fluid pulsation reducing device has the above-described configuration.
  • the hydraulic pump 1 When the hydraulic pump 1 is driven, the flow rate of the pressure oil fed through the pipeline 3 increases or decreases. Then, when the flow rate of the pressurized oil increases or decreases, the pressure of the pressurized oil in the pipeline 3 fluctuates, and pulsation of the pressurized oil occurs.
  • Such a pulsation of the pressure oil propagates in the pipe 3 and also to the control valve 4, and generates noise by vibrating the pipe 3 or the structure supporting the control valve 4. Will be generated.
  • the pulsation of the pressure oil by the hydraulic pump 1 generally comprises a fundamental frequency component and its harmonic components.
  • the length dimension L 0 of the side branch 6 is set such that the frequency F 0 matches the fundamental frequency of the pulsation of the pressure oil.
  • the relationship between the pressure oil pulsation frequency and the pulsation reduction rate is as shown in FIG. 8, and the inlet impedance of the side branch 6 is determined by the specific frequency F 0 and its odd number. It becomes minimum at double frequency 3 F 0, 5 F 0,.... For this reason, the pulsation reduction device according to the prior art can obtain a large pulsation damping rate with respect to the pulsation of the pressure oil at these frequencies F 0, 3 F 0, 5 F 0,. is there.
  • the pulsation reducer according to the prior art does not provide a pulsation at a frequency other than the above-mentioned frequency.
  • the pulsation cannot be sufficiently attenuated because the diameter does not become small.
  • the pulsation reducing device according to the related art cannot reduce, for example, the pulsation of the frequency 2F0 which is twice the frequency F0.
  • the sound velocity c in oil is 1400 mZs, and the pulsation frequency F0 is about 230 Hz. 6 has a length L 0 of about 1.5 m, which tends to be relatively long. Therefore, the disclosure of the invention has a problem that extra space is required to accommodate such a relatively long side branch 6.
  • the present invention has been made in view of the above-described problems of the related art, and an object of the present invention is to provide a fluid pulsation reducing device that can attenuate pulsations of a plurality of frequencies. It is another object of the present invention to provide a pulsation reducing device capable of reducing the size of the entire device.
  • the configuration adopted by the present invention to solve the above-mentioned problem is formed by connecting a plurality of pulsation attenuators for attenuating pulsations generated from a fluid device in series, and the pulsation damping of each of the stages is performed.
  • the vessel has a connection pipe having a start end serving as a pulsation input side, and a vessel connected to the end of the connection pipe to form a volume, and is located at the very start end side of the pulsation attenuators of the respective stages.
  • connection pipe of the first-stage pulsation attenuator is opened and connected to the fluid device side, and the connection pipes of the other pulsation-attenuators after the second stage are opened and connected to the adjacent vessel, and the final end side
  • the container of the pulsation attenuator, which is located at, is closed.
  • the pulsation attenuator at each stage can be
  • the fluid filled in each connecting pipe to be formed becomes a mass, and reciprocates in each connecting pipe with the pulsation of the flow rate from the fluid device which fluctuates at a predetermined frequency.
  • the fluctuation of the pressure at the predetermined frequency can be suppressed by the pulsation attenuator, and the pulsation of the fluid can be attenuated. Further, the pulsation of the fluid oscillating at a plurality of frequencies can be attenuated by the plurality of pulsation attenuators connected in series.
  • each connection pipe forming the pulsation attenuator of each stage is provided with chamfered portions on both end sides which are openings.
  • connection pipe and the container forming the pulsation attenuator of each stage can be disposed with their central axes located on the same axis.
  • the fluid device pumps fluid.
  • the connection pipe of the pulsation attenuator located in is connected. With this configuration, the pulsation of the pressure oil in the pipeline can be reduced by connecting the connecting pipe in the middle of the pipeline for feeding the fluid. .
  • the fluid device is a pump for discharging a fluid
  • a discharge port of the pump is connected to a connection pipe of a pulsation attenuator located at the most extreme end side of the pulsation attenuators of the respective stages. Make sure that is connected.
  • connection pipe is connected to the discharge port of the pump to reduce the pulsation of the fluid discharged from the pump, and the pump and the connection pipe are integrally formed. be able to.
  • the fluid device is a pump for discharging a fluid, and a plurality of pulsation attenuators including a pulsation attenuator located at the most extreme end side are provided in a casing of the pump.
  • the pulsation reducing device can be integrally formed in the casing of the pump, and the entire device including the pulsation reducing device and the pump can be reduced in size. it can.
  • FIG. 1 is a hydraulic circuit diagram showing a state in which a pipeline to which a pulsation reducing device according to an embodiment of the present invention is applied is connected to a hydraulic pump or the like.
  • FIG. 2 is a longitudinal sectional view showing the pulsation reducing device according to the embodiment.
  • FIG. 3 is a longitudinal sectional view showing first and second pulsation dampers of the pulsation reduction device according to the embodiment.
  • FIG. 4 shows the transmission loss and the pulsation reduction device according to the embodiment.
  • FIG. 3 is a characteristic diagram showing a relationship with frequency.
  • FIG. 5 is a sectional view showing a hydraulic shovel to which a pulsation reducing device according to a modification is applied.
  • FIG. 6 is a longitudinal sectional view showing a pulsation reducing device according to another modification.
  • FIG. 7 is a hydraulic circuit diagram showing a state in which a pipeline to which a pulsation reducing device according to the related art is applied is connected to a hydraulic pump or the like.
  • FIG. 8 is a characteristic diagram showing the relationship between the pulsation reduction rate and the frequency of the pulsation reduction device according to the related art.
  • FIGS. 1 to 4 show an example in which the fluid pulsation reducing device according to the embodiment is applied to a hydraulic circuit. Note that, in the present embodiment, the same components as those in the related art are denoted by the same reference numerals, and description thereof will be omitted.
  • reference numeral 11 denotes a pulsation reducing device connected to the pipeline 3, and the pulsation reducing device 11 is configured by connecting first and second pulsation attenuators 12 and 15 described later in series. Is composed of
  • Reference numeral 12 denotes a first pulsation attenuator connected to the middle position 3 A of the pipe 3, and the pulsation attenuator 12 includes a first connection pipe 13 and a first container 14 described later. ing.
  • the pulsation attenuator 12 is located at the very beginning of the pulsation reducing device 11, and the first connection pipe 13 and the first container 14 are filled with hydraulic oil.
  • Reference numeral 13 denotes a first connection pipe located at the most extreme end of the pulsation reduction device 11, and the connection pipe 13 is branched from the middle position 3A of the pipe 3 and connected as shown in FIG. At the same time, it is formed in a cylindrical shape having an inner diameter dimension d 1 and extends over a length dimension L 1.
  • the connecting pipe 13 is connected to the pipe 3 by opening its leading end to the pulsation input side and opening to the pipe 3, and is connected to the connecting pipe 13 by opening to the first container 14. . Further, both ends in the axial direction of the first connection pipe 13 have openings, and rounded chamfers 13 A, 13 B are formed at both ends. ing. The space in the first connection pipe 13 forms a first mass chamber A.
  • Reference numeral 14 denotes a first container integrally formed with the first connection pipe 13, and the container 14 is provided on both ends of the cylindrical portion 14 A and the cylindrical portion 14 A. It consists of the circles 14B and 14C.
  • the first connection pipe 13 is opened and connected to the center of the disk portion 14B provided on the starting end side of the cylindrical portion 14A.
  • a second connection pipe 16 described later is opened and connected to the center position.
  • the cylindrical portion 14A has an inner diameter dimension d2 and a length dimension L2, and the inner diameter dimension d2 is set to a value larger than the inner diameter dimension dl of the connecting pipe 13. Then, a first volume B is defined inside the container 14. The volume B communicates with the pipe 3 via the connecting pipe 13, and the volume B is filled with hydraulic oil.
  • Reference numeral 15 denotes a second pulsation attenuator 15 connected to the container 14 of the first pulsation attenuator 12, and the pulsation attenuator 15 is connected to a second connection pipe 16 to be described later and a second pulsation attenuator 16.
  • Container 17. The pulsation attenuator 15 is located at the terminal end of the pulsation reducing device 11, and is located in the second connection pipe 16 and the second vessel 17. Is filled with hydraulic oil.
  • connection pipe 16 denotes a second connection pipe connected to the adjacent first container 14.
  • the connection pipe 16 is formed in a cylindrical shape having an inner diameter d 3 as shown in FIG. It extends over a length dimension L3.
  • the inner diameter d 3 of the connection pipe 16 is the first vessel.
  • connection pipe 16 is opened and connected to the center of the circular portion 14 C of the container 14 with the start end side serving as a pulsation input side, and the end end side is opened to the second container 17. Connected. Both ends of the second connection pipe 16 in the axial direction are openings, and rounded chamfers 16A and 16B are formed at both ends. .
  • the space inside the second connection pipe 16 forms a second mass chamber C. 17 is a second container formed integrally with the second connection pipe 16, Reference numeral 7 denotes a cylindrical tube portion 17A, and disk portions 17B and 17C provided on both end surfaces of the tube portion 17A.
  • a second connection pipe 16 is opened and connected to the center position of the disk portion 17B provided on the starting end side of the cylindrical portion 17A.
  • the vessel 17 of the pulsation attenuator 15 located at the final end is closed by the cylindrical portion 17A and the disc portions 17B and 17C.
  • the cylindrical portion 17A has an inner diameter d4 and a length L4, and the inner diameter d4 is set to a value larger than the inner diameter d3 of the connection pipe 16.
  • a second volume D is defined inside the cylindrical portion 17A. The volume D communicates with the first container 14 via the second connection pipe 16, and the volume D is filled with hydraulic oil.
  • first and second connection pipes 13 and 16 and the first and second connection pipes are connected.
  • These containers 14 and 17 have their central axes located on the same axis. Thereby, the pulsation reduction device 11 can be easily manufactured.
  • the pulsation reduction device 11 has the above-described configuration. Next, the operation thereof will be described with reference to FIG.
  • the hydraulic fluid in the first connection pipe 13 When the pressure in the pipe 3 rises, the hydraulic fluid in the first connection pipe 13 is united with the first vessel 14 in the first connection pipe 13. Move in. At this time, the hydraulic oil filled in the first container 14 expands and contracts in the first container 14 due to the elasticity of the hydraulic oil, and is filled in the second container 17. The hydraulic oil also expands and contracts in the second container 17 due to the elasticity of the hydraulic oil. Then, the hydraulic oil in the second connection pipe 16 moves integrally between the first and second containers 14 and 17 in the second connection pipe 16.
  • the hydraulic oil in the first connection pipe 13 is integrated into the first connection pipe 13 and flows into the pipe 3. Moving. At this time, the hydraulic oil filled in the first container 14 expands and contracts in the first container 14 due to the elasticity of the hydraulic oil, and is filled in the second container 17. The hydraulic oil also expands and contracts in the second container 17 due to the elasticity of the hydraulic oil. Then, the hydraulic oil in the second connection pipe 16 moves integrally between the first and second containers 14 and 17 in the second connection pipe 16.
  • the first connection pipe 13 formed by the first connection pipe 13 The hydraulic oil in the first mass chamber A constitutes the first mass ml for storing kinetic energy.
  • the hydraulic oil in the second mass chamber C formed by the second connection pipe constitutes a second mass m2 for storing kinetic energy.
  • the hydraulic oil in the volume B formed by the first container 14 constitutes a capacity C 1 corresponding to a spring connecting the masses m 1 and m 2.
  • the hydraulic oil in the volume D formed by the second container 17 constitutes a volume C 2 corresponding to a spring supporting the mass m2.
  • the first and second masses ml and m2 are connected in series by the first and second capacitors C1 and C2, the mutual connection between the masses ml and m2 and the capacitors C1 and C2 is established.
  • the pulsation of the pressure oil oscillating at the predetermined first and second frequencies F 1 and F 2 can be attenuated.
  • the pressure pulsation P in (S) and the flow pulsation Q in (S) on the input side (hydraulic pump 1 side) and the flow rate pulsation Q in (S) at the intermediate position 3 A of the pipeline 3 to which the connection pipe 13 is connected are output.
  • the pressure pulsation P out (S) and the flow pulsation Q out (S) on the pressure side (actuator 5 side) have the relationship shown in Equation 2 below.
  • T (s) indicates the transmission matrix at the intermediate position 3A of the pipeline 3
  • each element of the transmission matrix T (s) The elements T11 to T22 can be expressed as in the following Expression 3 using the inlet impedance Zr (s) of the first connection pipe 13.
  • each pressure pulsation P 1 ( S), P2 (S), P3 (S), P4 (S) and flow pulsations Q1 (S), Q2 (S), Q3 (S), Q4 (S) Has the relationship shown in Equation 4 below. (Equation 4)
  • J m (s) J 1 (s), J 2 (s), J 3 (s), and J 4 (s) are adjacent first connection pipes 13 and first vessels 1 4, the transmission matrix of the second connection pipe 16 and the second container 17 is shown.
  • each element J m ll ⁇ J m 22 of said transmission Itaruma preparative click scan J m (s) is, first connecting tube 1 3, the first container 1 4, the second connecting pipe 1 6
  • the characteristic impedance Zm (s) of the second container 17 Z1 (s), Z2 (s), Z3 (s), Z4 (s)
  • the characteristic impedance Zm (s) of the first connection pipe 13, the first vessel 14, the second connection pipe 16, and the second vessel 17 is the fluid density p .
  • the inner diameter dm (d 1, d 2, d 3, d 4) can be expressed as in the following Equation 6.
  • m (s) is a coefficient indicating the viscous resistance of the fluid in the first connection pipe 13, the first vessel 14, the second connection pipe 16, and the second vessel 17.
  • the coefficient m (s) can be expressed by the following equation 7 using the kinematic viscosity of the fluid.
  • the characteristic impedance Z t (s) at the middle position 3 A of the pipe 3 is the density p of the fluid, the sound velocity C t in the fluid at the middle position 3 A of the pipe 3, and the inner diameter of the pipe 3.
  • dt the dimension of the pipe 3.
  • ft (s) is a coefficient indicating the viscous resistance of the fluid at an intermediate position 3A of the pipe 3
  • coefficient t (s) is expressed by the following equation 10 using the kinematic viscosity of the fluid.
  • the transmission loss TL for the frequency F is calculated using the characteristic impedance Zt at the intermediate position 3 A in the pipe 3 and the inlet impedance Zr of the first connection pipe 13 as follows: It is shown as 1. [Equation 1 1]
  • T L 2 0 1 o g 2 +
  • Figure 4 shows the relationship between the frequency F and the transmission loss TL, and as shown by the characteristic line 18 in Figure 4, the first frequency F 1 It shows a large transmission loss TL with respect to the pulsation of the pressure oil with the second frequency F2. Therefore, the pulsation reduction device 11 can reduce the pulsation of the pressure oil that fluctuates at two different frequencies Fl and F2. Therefore, the pulsation reducing device 11 reduces, for example, the pulsation of the pressure oil oscillating at the fundamental frequency F 1 and also ensures the pulsation of the pressure oil oscillating at the second harmonic frequency F 2. Can be attenuated.
  • the pulsation of the pressure oil at the two frequencies Fl and F2 is caused by the inner diameters dl and d3 of the first and second connection pipes 13 and 16 and the lengths L1 and L1.
  • L 3, the inner diameter d 2, d 4, and the length L 2, L 4 of the first and second containers 147 are appropriately set using the relationship of 2 to 10. It can be reduced efficiently.
  • the inner diameter dimensions dl to d4 and the length dimension L1L are set so that the resonance frequency of the pulsation reducing device 11 matches the pulsation frequencies F1 and F2. , F 2, the input impedance Zr of the pulsation reducer 11 is minimized by using the relationship of Equations 2 to 10 as appropriate. As a result, the pulsation of the pressure oil at the two frequencies Fl and F2 can be efficiently reduced.
  • the first pulsation attenuator 12 composed of the first connection pipe 13 and the first container 14 and the second pulsation attenuator 12
  • a second pulsation attenuator 15 composed of a connection pipe 16 and a second vessel 17 is connected in series, and a connection pipe 13 of the pulsation attenuator 12 on the leading end side is connected to the pipe line 3.
  • the container 17 of the pulsation attenuator 15 at the final end is closed. For this reason, when the flow rate fluctuates in the pipe 3, the hydraulic oil filled in the first container 14 expands and contracts due to its elasticity, and the second container 1 Hydraulic fluid filled in 7 expands and contracts due to its elasticity. As a result, fluctuations in the pressure in the pipeline 3 can be suppressed, and pulsation of the pressurized oil can be reduced.
  • first pulsation attenuator 12 is constituted by the first connection pipe 13 and the first container 14, and the second pulsation attenuator 15 is connected to the second connection pipe 16.
  • the first and second pulsation attenuators 12 and 15 can be formed in a compact form because they are constituted by the second container 17, and the overall length of the pulsation reduction device 11 is smaller than that of the prior art.
  • the height dimension can be shortened. For this reason, no extra space is required as compared with the conventional technology, and the pulsation reduction device 11 can be easily applied even when the pipeline 3 is arranged in a relatively narrow place. It can be.
  • first and second connection pipes 13 and 16 are connected to the first and second connection pipes.
  • the second containers 14 and 17 are configured so that the central axes are located on the same axis, they can be easily manufactured.
  • chamfers 13A, 13B, 16A, and 16B were formed at both ends in the axial direction where the first and second connection pipes 13 and 16 were opened. Therefore, it is possible to suppress the generation of the vortex at both ends of the connection pipes 13 and 16 due to the pulsation of the pressure oil. In this way, it is possible to prevent the flow resistance from increasing due to the eddy current, so that the pulsation in the pipe 3 can be further reduced.
  • the connection pipe 13 of the first pulsation attenuator 12 on the start end side is configured to be connected to the pipe 3, pulsation of the pressure oil generated in the pipe 3 can be reduced.
  • the pipeline 3 connects the hydraulic pump 1 and the actuator 5, the pulsation reducing device 11 may be provided at any position of the pipeline 3. 1 increases the degree of freedom of installation.
  • the pulsation reducing device 11 is provided in the middle of the pipe 3.
  • the present invention is not limited to this.
  • the pipe 3 is connected to the discharge port 1A of the hydraulic pump 1 and the connection pipe 13 of the pulsation reduction device 11 is connected.
  • the pulsation reducing device 11 ′ is formed by being integrally incorporated into the casing 1 A of the hydraulic pump 1. You may. By attaching the hydraulic pump 1 and the pulsation reduction device 11 to the hydraulic pump 1 and the like as a pulsation source of the pressure oil in this way, the entire hydraulic circuit can be downsized. This is possible.
  • the pulsation reducing device 11 is configured by connecting the two-stage pulsation attenuators 12 and 15 in series.
  • the pulsation reducer 11 may be configured by connecting three or more stages of pulsation attenuators in series as in the example.
  • the first pulsation attenuator 102 is constituted by the first connection pipe 103 and the first container 104
  • the second pulsation attenuator 105 is constituted by the first pulsation attenuator 105.
  • the second pulse is constituted by the second connection pipe 106 and the second vessel 107.
  • the dynamic attenuator 108 may be constituted by the third connection pipe 109 and the third container 110. With such a configuration, the pulsation of the pressure oil oscillating at three frequencies can be reduced.
  • the present invention may have a configuration in which four or more pulsation attenuators are connected in series.
  • first and second connection pipes 13 and 16 and the first and second vessels 14 and 17 are arranged on the same axis.
  • the present invention is not limited to this.
  • the second connection pipe 16 may be connected to the cylindrical portion 14A of the first container 14 as long as a plurality of pulsation attenuators are connected in series. .
  • the second frequency F 2 is twice the frequency of the first frequency F 1.
  • the present invention is not limited to this.
  • a hydraulic pump may be used.
  • the first frequency F1 and the second frequency F2 are set to reduce the pulsation of the pressure oil corresponding to these speeds. You may do it.
  • the first container and the second container are formed in a cylindrical shape.
  • the first container and the second container are not necessarily required to be cylindrical, and the first volume B and the second Other shapes such as a polygonal cross section, an elliptical cross section, and an elliptical cross section may be used as long as the volume D is formed.
  • the pulsation reducing device is described as being applied to the pipeline for pumping the pressure oil.
  • the present invention is not limited to this, and the hydraulic pressure for pumping a fluid such as water or air is not limited to this. It can be widely applied to piping and pneumatic piping.
  • Industrial applicability As described in detail above, according to the present invention, a plurality of pulsation attenuators each including a connection pipe and a container are connected in series, and the connection pipe of the first-stage pulsation attenuator at the start end is connected to the pipeline. At the same time, the pulsation damper container on the final end side is closed. Therefore, when the flow rate of the fluid fluctuates in the pipeline, the fluid filled in each container expands and contracts due to its elasticity. As a result, it is possible to reduce the pulsation of the pressure of a plurality of frequencies generated in the pipeline.
  • the pulsation damping device is composed of a plurality of stages of pulsation dampers composed of a connection pipe and a container, the pulsation damping device of each stage can be formed in a compact, and the pulsation damping device is compared with the conventional technology.
  • the overall length can be shortened. For this reason, extra space is not required as compared with the conventional technology, and the pulsation reducing device can be easily applied even when the pipeline is disposed in a relatively narrow place. Can be done.
  • the vortex flows at both ends of the connection pipe with the pulsation of the pressure oil. This can be suppressed. This can prevent the flow resistance from increasing due to the eddy current, so that the pulsation in the pipeline can be further reduced.
  • connection pipe of the first-stage pulsation attenuator located on the most initial end side is connected to the pipeline, the pulsation of the pressure oil generated in the pipeline can be reduced and Therefore, the degree of freedom in mounting the pulsation reducing device can be increased.
  • connection pipe of the first-stage pulsation attenuator located on the most leading end side is connected to the discharge port of the pump, the pump and the pulsation reduction device are integrally formed.
  • Fluid equipment that can be formed and consists of pumps, pulsation reduction devices, etc. It is possible to reduce the overall size.
  • the entire apparatus including the pulsation reduction device and the pump is provided. It can be downsized.

Abstract

L'invention concerne un dispositif d'amortissement des pulsations permettant d'amortir les pulsations de plusieurs fréquences, et dont la taille globale est réduite. Un premier réservoir (14) est placé du côté de l'extrémité de décharge d'une première canalisation de raccordement (13) reliée à une canalisation (3) de manière à former un premier dispositif d'amortissement des pulsations (12) avec la première canalisation de raccordement (13) et le premier réservoir (14). Une deuxième canalisation de raccordement (16) est reliée au premier réservoir (14) et un deuxième réservoir (17) est relié au côté d'extrémité de décharge de la canalisation de raccordement (16) de manière à former un deuxième dispositif d'amortissement des pulsations (15) avec la deuxième canalisation de raccordement (16) et le deuxième réservoir (17). Les premier et deuxième dispositifs d'amortissement de pulsations (12) et (15) sont reliés en série.
PCT/JP1999/002123 1998-04-24 1999-04-21 Dispositif de reduction des pulsations d'un fluide WO1999056052A1 (fr)

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JP55279199A JP3392879B2 (ja) 1998-04-24 1999-04-21 流体の脈動低減装置

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JP10/131105 1998-04-24
JP13110598 1998-04-24

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JP2007016698A (ja) * 2005-07-08 2007-01-25 Hitachi Ltd オイルポンプ
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US8507279B2 (en) 2009-06-02 2013-08-13 Accuri Cytometers, Inc. System and method of verification of a prepared sample for a flow cytometer

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JPH07301386A (ja) * 1994-03-10 1995-11-14 Ishikawajima Harima Heavy Ind Co Ltd キャビティの共鳴音発生防止装置
JPH0932990A (ja) * 1995-07-20 1997-02-07 Hitachi Constr Mach Co Ltd 脈動低減装置
JPH09287692A (ja) * 1996-04-23 1997-11-04 Hitachi Constr Mach Co Ltd ヘルムホルツ型脈動低減装置

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WO2002090771A2 (fr) * 2001-05-09 2002-11-14 The Provost Fellows And Scholars Of The College Of The Holy And Undivided Trinity Of Queen Elizabeth Near Dublin Systeme de pompage de liquide
WO2002090771A3 (fr) * 2001-05-09 2002-12-12 Trinity College Dublin Systeme de pompage de liquide
JP2007016698A (ja) * 2005-07-08 2007-01-25 Hitachi Ltd オイルポンプ
EP1957853A2 (fr) * 2005-12-07 2008-08-20 Accuri Instruments Inc. Attenuateur de pulsations pour systeme fluidique
EP1957853A4 (fr) * 2005-12-07 2011-01-26 Accuri Instr Inc Attenuateur de pulsations pour systeme fluidique
US7845920B2 (en) 2006-03-24 2010-12-07 Honda Motor Co., Ltd. Oil pump
CN101042134B (zh) * 2006-03-24 2012-02-01 本田技研工业株式会社 油泵
US10031064B2 (en) 2010-10-25 2018-07-24 Accuri Cytometers, Inc. Systems and user interface for collecting a data set in a flow cytometer
US10481074B2 (en) 2010-10-25 2019-11-19 Becton, Dickinson And Company Systems and user interface for collecting a data set in a flow cytometer
US11125674B2 (en) 2010-10-25 2021-09-21 Becton, Dickinson And Company Systems and user interface for collecting a data set in a flow cytometer

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JP3392879B2 (ja) 2003-03-31

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