CN111911740A - Pulsation damping device, screw pump and liquid pressure pulsation adjusting method - Google Patents

Pulsation damping device, screw pump and liquid pressure pulsation adjusting method Download PDF

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Publication number
CN111911740A
CN111911740A CN202010888385.5A CN202010888385A CN111911740A CN 111911740 A CN111911740 A CN 111911740A CN 202010888385 A CN202010888385 A CN 202010888385A CN 111911740 A CN111911740 A CN 111911740A
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China
Prior art keywords
pressure
pulsation
cavity
damping device
diaphragm
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CN202010888385.5A
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Chinese (zh)
Inventor
何宏
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Wuxi Veler Technology Co ltd
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Wuxi Veler Technology Co ltd
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Priority to CN202010888385.5A priority Critical patent/CN111911740A/en
Publication of CN111911740A publication Critical patent/CN111911740A/en
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    • 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
    • F16L55/045—Devices damping pulsations or vibrations in fluids specially adapted to prevent or minimise the effects of water hammer
    • F16L55/05—Buffers therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
    • F04C11/008—Enclosed motor pump units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C13/00—Adaptations of machines or pumps for special use, e.g. for extremely high pressures
    • F04C13/001—Pumps for particular liquids
    • F04C13/002—Pumps for particular liquids for homogeneous viscous liquids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/24—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0042—Systems for the equilibration of forces acting on the machines or pump
    • F04C15/0049—Equalization of pressure pulses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/107—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth
    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F13/00—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
    • F16F13/04—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper
    • F16F13/06—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper
    • F16F13/08—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper the plastics spring forming at least a part of the wall of the fluid chamber of the damper
    • F16F13/10—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper the plastics spring forming at least a part of the wall of the fluid chamber of the damper the wall being at least in part formed by a flexible membrane or the like
    • F16F13/101—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper the plastics spring forming at least a part of the wall of the fluid chamber of the damper the wall being at least in part formed by a flexible membrane or the like characterised by buffering features or stoppers
    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F13/00—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
    • F16F13/04—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper
    • F16F13/06—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper
    • F16F13/08—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper the plastics spring forming at least a part of the wall of the fluid chamber of the damper
    • F16F13/10—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper the plastics spring forming at least a part of the wall of the fluid chamber of the damper the wall being at least in part formed by a flexible membrane or the like
    • F16F13/102—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper the plastics spring forming at least a part of the wall of the fluid chamber of the damper the wall being at least in part formed by a flexible membrane or the like characterised by features of flexible walls of equilibration chambers; decoupling or self-tuning means
    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F13/00—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
    • F16F13/04—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper
    • F16F13/06—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper
    • F16F13/08—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper the plastics spring forming at least a part of the wall of the fluid chamber of the damper
    • F16F13/10—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper the plastics spring forming at least a part of the wall of the fluid chamber of the damper the wall being at least in part formed by a flexible membrane or the like
    • F16F13/103—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper the plastics spring forming at least a part of the wall of the fluid chamber of the damper the wall being at least in part formed by a flexible membrane or the like characterised by method of assembly, production or treatment
    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F13/00—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
    • F16F13/04—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper
    • F16F13/06—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper
    • F16F13/08—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper the plastics spring forming at least a part of the wall of the fluid chamber of the damper
    • F16F13/10—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper the plastics spring forming at least a part of the wall of the fluid chamber of the damper the wall being at least in part formed by a flexible membrane or the like
    • F16F13/105—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper the plastics spring forming at least a part of the wall of the fluid chamber of the damper the wall being at least in part formed by a flexible membrane or the like characterised by features of partitions between two working chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F17D1/20—Arrangements or systems of devices for influencing or altering dynamic characteristics of the systems, e.g. for damping pulsations caused by opening or closing of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/12—Vibration
    • F04C2270/125—Controlled or regulated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/14—Pulsations
    • F04C2270/145—Controlled or regulated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/18—Pressure
    • F04C2270/185—Controlled or regulated

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Reciprocating Pumps (AREA)

Abstract

The invention discloses a pulsation damping device, a screw pump and a liquid pressure pulsation adjusting method, which can meet the pressure pulsation absorption requirements of fluids with different viscosities, can improve the universality and can greatly reduce the pressure pulsation amplitude at the same time, the pulsation damping device comprises a shell, an air inlet and an elastic diaphragm arranged in the shell, the shell is of a split structure, the diaphragm comprises at least two diaphragms, two adjacent diaphragms are fixed in the shell at intervals and divide the shell into at least three cavities which are not communicated with each other, the air inlet is communicated with an upper cavity, a lower cavity is communicated with a liquid conveying pipeline, a pressure adjusting valve is arranged between the air inlet and the upper cavity, the screw pump comprises a pump body, a feed inlet, a discharge outlet, a screw rod and a screw rod driving device, the pulsation damping device is arranged at the top end of the pump body, and the method for adjusting the liquid pressure pulsation in the, and the gas pressure in the upper cavity is adjusted through the pressure adjusting valve according to the liquid pressure pulsation amplitude in the pump body.

Description

Pulsation damping device, screw pump and liquid pressure pulsation adjusting method
Technical Field
The invention relates to the technical field of a pulsation damper or a screw pump, in particular to a pulsation damper capable of effectively reducing the pulsation amplitude of liquid pressure, a screw pump applying the pulsation damper and a liquid pressure pulsation adjusting method.
Background
The pulsation damper is a pressure container for eliminating liquid pressure pulsation or flow pulsation, is applied to the conveying process of fluid substances due to the effects of stabilizing the pressure and flow of fluid, eliminating vibration, increasing the volumetric efficiency of a pump and the like, and is determined after comprehensive calculation and analysis according to parameters such as flow, pressure, pump type, pulsation elimination rate, pipeline fluid components, pipeline fluid density, pipeline fluid viscosity and the like in actual processing production.
At present, common pulsation dampers comprise an air bag type pulsation damper and a diaphragm type pulsation damper, but the existing pulsation damper still has the problems of poor pressure pulsation reducing effect, poor universality and the like, the air bag type pulsation damper comprises a shell and an air bag filled with inert gas, the pulsation damper is suitable for application with pulsation frequency less than 7HZ, if the frequency is too high, the air bag cannot respond in time, and the effect of eliminating pulsation or reducing pressure pulsation amplitude cannot be achieved; the diaphragm type pulsation damper absorbs the peak value of the flow in the pipeline by changing the volume of the gas in the space through the deformation of the diaphragm, but the volume of the gas in the space of the existing diaphragm type pulsation damper is constant, and the diaphragm type pulsation damper is generally only suitable for the pulsation absorption with low fluid viscosity and small pressure pulsation amplitude change, and is not suitable for the pulsation absorption with high fluid viscosity and large pulsation amplitude. Therefore, it is an urgent need to solve the problem of the art to provide a pulsation damping device that can be used for absorbing pressure pulsation of a high-viscosity fluid or a low-viscosity fluid and can ensure a stable liquid flow rate and pressure.
Disclosure of Invention
Aiming at the problems of poor pressure pulsation reducing effect, poor universality and the like of a pulsation damper in the prior art, the invention provides a pulsation damping device which can meet the pressure pulsation absorption requirements of fluids with different viscosities, can improve the universality and can greatly reduce the pressure pulsation amplitude at the same time.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a pulsation damping device, its includes casing, air inlet, install in elastic diaphragm in the casing, the casing is split type structure, a serial communication port, the diaphragm includes at least two, and is adjacent the diaphragm interval is fixed in the casing, and will the casing is separated for the cavity that at least three each other does not communicate, the cavity includes cavity, lower cavity, the air inlet with go up cavity intercommunication, cavity and liquid conveying pipeline intercommunication down, the air inlet with go up and be provided with pressure regulating valve between the cavity.
It is further characterized in that the method further comprises the steps of,
the diaphragm comprises two diaphragms and divides the shell into three cavities which are not communicated with each other, the cavities comprise an upper cavity, a lower cavity and a middle cavity, the upper cavity is filled with gas, and the lower cavity is filled with liquid;
the shell comprises an upper shell, a middle shell and a lower shell which are sequentially distributed, and the upper shell and the middle shell, and the middle shell and the lower shell are respectively fixed in a sealing manner;
the two diaphragms are respectively embedded at the joints of the upper shell and the middle shell and the joints of the middle shell and the lower shell;
t-shaped grooves are formed in the inner side of the shell, the joints of the upper shell and the middle shell and the joints of the middle shell and the lower shell are respectively provided with a T-shaped groove, clamping pieces matched with the T-shaped grooves are respectively arranged at two ends of the diaphragm, and the diaphragm is embedded in the groove through the clamping pieces;
the membrane is made of silica gel;
the upper shell is convex, the middle shell is I-shaped, the lower shell is concave, and a first through hole communicated with the air inlet is formed in the middle of the upper shell;
it still includes: the pressure regulating valve is arranged on the first pipeline, and one end of the second pipeline is fixed with the bottom end of the shell in a sealing manner;
the liquid pressure in the lower cavity is equal to the gas pressure in the upper cavity, and the gas pressure of the middle cavity is smaller than the gas pressure of the upper cavity.
The screw pump is characterized in that the pulsation damping device is arranged at the top end of the pump body, the pressure of liquid in the lower cavity is equal to the pressure of gas in the upper cavity, and the pressure of gas in the middle cavity is smaller than the pressure of gas in the upper cavity.
The method for adjusting the liquid pressure pulsation in the screw pump by adopting the pulsation damping device is characterized in that the gas pressure in the upper cavity is adjusted by the pressure adjusting valve according to the liquid pressure pulsation amplitude in the pump body.
It is further characterized in that the method further comprises the steps of,
the gas pressure in the upper cavity is 0.1MPa to 0.3 MPa;
the gas pressure in the middle cavity is zero.
By adopting the structure of the invention, the following beneficial effects can be achieved: (1) the diaphragm between the middle cavity and the lower cavity is used for absorbing liquid pressure vibration, and the diaphragm between the middle cavity and the upper cavity is used as pressure support under the action of air pressure, so that the effect of eliminating pulsation or reducing pressure pulsation amplitude is improved.
(2) Aerify in the cavity that makes progress through the air inlet, be provided with pressure regulating valve between air inlet and the last cavity, according to actual demand, through the internal gas pressure of pressure regulating valve regulation epicoele to realized the regulation of the diaphragm holding power between middle part cavity and the last cavity, adjusted the diaphragm holding power through air supply and pressure regulating valve, in order to satisfy the pressure pulsation absorption requirement of different fluid viscosity, improved the commonality and the flexibility of being suitable for of this device.
(3) Go up the cavity and be provided with the middle part cavity down between the cavity, when two diaphragms pressurized deformation, the setting of middle part cavity has increased pressure buffer amplitude, has played the pressure pulsation absorption requirement that satisfies different fluid viscosity, improves the commonality of this device and the effect that is suitable for the flexibility.
Drawings
FIG. 1 is a schematic sectional view of the present invention;
fig. 2 is a schematic view of a screw pump according to a lithium battery of the present invention.
Detailed Description
Referring to fig. 1, a pulsation damping device comprises a shell 1, an air inlet 2, and an elastic diaphragm 3 installed in the shell 1, wherein the air inlet 2 is used for connecting with an external air source, the shell 1 is a split structure and comprises a convex upper shell 11, an i-shaped middle shell 12, and a concave lower shell 13 which are sequentially distributed from top to bottom, the middle of the upper shell 11 is provided with a first through hole 110 communicated with the air inlet 2, and the middle of the lower shell 13 is provided with a second through hole 130 communicated with a liquid conveying pipeline, in this embodiment, the liquid conveying pipeline is a pump body 10 of a screw pump, see fig. 2;
t-shaped grooves are respectively formed in the inner side of the shell 1 and at the joints of the upper shell 11 and the middle shell 12 and the joints of the middle shell 12 and the lower shell 13.
The diaphragm 3 comprises two diaphragms, namely a first diaphragm 31 and a second diaphragm 32, the two diaphragms are fixed in the shell 1 at intervals, two ends of the first diaphragm 31 and the second diaphragm 32 are respectively provided with clamping pieces matched with the T-shaped grooves 14, the first diaphragm 31 is embedded in a first groove 151 between the upper shell 11 and the middle shell 12 through a first clamping piece 141, and the first diaphragm 32 is embedded in a second groove 152 between the middle shell 12 and the lower shell 13 through a second clamping piece 142; the two diaphragms are arranged at intervals, when the fluid pulsation amplitude is small, the effect of pressure pulsation buffering can be achieved through one diaphragm, when the fluid pulsation amplitude is large, the two layers of diaphragms can act simultaneously to achieve the effect of pressure pulsation buffering, the double layers of diaphragms are arranged, the isolation thickness between liquid in the lower cavity and gas in the upper cavity is increased, the sealing performance between the cavities is improved, and when one diaphragm is damaged, the other diaphragm can still achieve the effect of isolating the gas and the liquid.
The first diaphragm 31 and the second diaphragm 32 divide the housing 1 into three cavities that are not communicated with each other: the pump comprises an upper cavity 41, a middle cavity 42 and a lower cavity 43, wherein an air inlet 2 is communicated with the upper cavity 41, the lower cavity 43 is communicated with the pump body 10, and a pressure regulating valve 5 which is a pressure reducing valve is arranged between the air inlet 2 and the upper cavity.
It still includes: the gas inlet 2 is located at one end of the first pipeline 16, the other end of the first pipeline 16 is fixedly sealed with the top end of the upper shell 11 and is communicated with the first through hole 110, the pressure regulating valve 5 is installed on the first pipeline 16, one end of the second pipeline 17 is fixedly sealed with the bottom end of the lower shell 13, and the other end of the second pipeline 17 is communicated with the pump body 10.
The screw pump applied to the existing lithium battery coating machine comprises a pump body 10, a feeding hole 4, a discharging hole 5, a screw rod 6 and a motor 7 for driving the screw rod 6 to rotate, wherein the pulsation damping device is arranged at the top end of the pump body 10 and is positioned at one side close to the discharging hole 5, as shown in figure 2, the feeding hole 4 is used for being communicated with a slurry barrel of the coating machine, the discharging hole 5 is used for being connected with a coating head of the coating machine, the gas pressure in an upper cavity is equal to the liquid pressure in a lower cavity, or the gas pressure in the upper cavity is slightly greater than the liquid pressure in the lower cavity;
the pulsation damping device is adopted to adjust the pressure pulsation of the lithium battery slurry in the screw pump, and the gas pressure in the upper cavity 41 is adjusted through the pressure reducing valve according to the pressure pulsation amplitude of the lithium battery slurry in the pump body, so that the gas pressure in the upper cavity 41 is consistent with the liquid pressure in the lower cavity 43, and the effect of reducing the pressure pulsation amplitude of the lithium battery slurry is achieved;
the pressure pulsation amplitude of lithium battery slurry in the pump body is obtained by measuring a pressure gauge, when the screw pump works, air is filled into the upper cavity 41 through an air source, the lithium battery slurry flows from the feeding hole 4 to the discharging hole 5, and is filled into the lower cavity 43 when passing through the pulsation damper, the pressure in the upper cavity 11 is adjusted through the pressure reducing valve, so that the gas pressure in the upper cavity 11 is equal to the liquid pressure in the lower cavity, in the embodiment, the gas pressure output by the air source is 0.5 MPa-0.6 MPa, after the pressure reduction adjustment through the pressure reducing valve, the gas pressure in the upper cavity 41 is 0.1 MPa-0.3 MPa, and the hydraulic pressure in the lower cavity 43 is 0.1 MPa-0.3 MPa; the air pressure of the middle cavity 42 is smaller than the air pressure of the upper cavity 41, the middle cavity is positioned between the first diaphragm 31 and the second diaphragm 32, the middle cavity 42 is a closed cavity, the air pressure is close to zero, the lithium battery slurry is high-viscosity fluid, when the two diaphragms deform under pressure, the pressure buffering amplitude is increased by the arrangement of the middle cavity, and the requirement of absorbing the pressure pulsation of the high-viscosity fluid is met.
The diaphragm is made of silica gel, has the characteristics of high elasticity, high pressure resistance and corrosion resistance, and is embedded at the connecting parts of the upper shell and the middle shell and the lower shell through the clamping pieces, so that the sealing property between the upper shell and the middle shell and between the middle shell and the lower shell can be improved, and gas or liquid leakage is prevented;
the casing 1 is designed to be a split structure, so that the assembling and disassembling operation of the pulsation damper are convenient, and the assembling, disassembling and replacing operation of the diaphragms are also convenient to realize, the two ends of the upper casing 11, the middle casing 12 and the lower casing 13 are respectively provided with threaded holes corresponding to each other, before the upper casing 11, the middle casing 12 and the lower casing 13 are assembled into the casing 1, the first diaphragm 31 and the second diaphragm 32 are firstly embedded in the first groove 151 and the second groove 152, then bolts penetrate through the threaded holes to fix the two ends of the upper casing 11 and the two ends of the middle casing 12 and the two ends of the lower casing 13, otherwise, the replacement of the diaphragms can be realized by disassembling the bolts.
What has been described above is only a preferred embodiment of the present application, and the present invention is not limited to the above embodiment. It is to be understood that other modifications and variations directly derivable or suggested by those skilled in the art without departing from the spirit and concept of the present invention are to be considered as included within the scope of the present invention.

Claims (10)

1. The utility model provides a pulsation damping device, its includes casing, air inlet, install in elastic diaphragm in the casing, the casing is split type structure, a serial communication port, the diaphragm includes at least two, and is adjacent the diaphragm interval is fixed in the casing, and will the casing is separated for the cavity that at least three each other does not communicate, the cavity includes cavity, lower cavity, the air inlet with go up cavity intercommunication, cavity and liquid conveying pipeline intercommunication down, the air inlet with go up and be provided with pressure regulating valve between the cavity.
2. The pulsation damper according to claim 1, wherein said diaphragm comprises two and divides said housing into three cavities which are not connected to each other, said cavities comprising said upper cavity, said lower cavity and said middle cavity, said upper cavity being filled with gas and said lower cavity being filled with liquid.
3. The pulsation damping device according to claim 2, wherein said housing comprises an upper housing, a middle housing and a lower housing which are sequentially distributed, and said upper housing and said middle housing, and said middle housing and said lower housing are respectively fixed in a sealing manner.
4. The pulsation damper according to claim 3, wherein said two diaphragms are respectively fitted to the joints of said upper casing and said middle casing and said lower casing.
5. The pulsation damping device according to claim 4, wherein the inner side of the housing, the joints of the upper housing and the middle housing, and the joints of the middle housing and the lower housing are respectively provided with a T-shaped groove, two ends of the diaphragm are respectively provided with a clamping piece matched with the T-shaped groove, and the diaphragm is embedded in the groove through the clamping pieces.
6. A pulsation damping device according to claim 5, wherein said diaphragm is made of silicone.
7. The pulsation damping device according to claim 6, further comprising: the pressure regulating valve is arranged on the first pipeline, and one end of the second pipeline is fixed with the bottom end of the shell in a sealing manner.
8. A screw pump applying the pulsation damping device according to claim 7, the screw pump comprising a pump body, a feeding port, a discharging port, a screw, and a screw driving device, wherein the pulsation damping device is installed at the top end of the pump body, the pressure of the liquid in the lower chamber is equal to the pressure of the gas in the upper chamber, and the pressure of the gas in the middle chamber is lower than the pressure of the gas in the upper chamber.
9. A method of adjusting the pressure pulsation of the liquid in the screw pump according to claim 8 by using the pulsation damping device according to any one of claims 1 to 7, wherein the pressure of the gas in the upper chamber is adjusted by the pressure adjusting valve in accordance with the amplitude of the pressure pulsation of the liquid in the pump body.
10. The pulsation damper according to claim 9, wherein the gas pressure in said upper chamber is 0.1 to 0.3 MPa.
CN202010888385.5A 2020-08-28 2020-08-28 Pulsation damping device, screw pump and liquid pressure pulsation adjusting method Pending CN111911740A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010888385.5A CN111911740A (en) 2020-08-28 2020-08-28 Pulsation damping device, screw pump and liquid pressure pulsation adjusting method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010888385.5A CN111911740A (en) 2020-08-28 2020-08-28 Pulsation damping device, screw pump and liquid pressure pulsation adjusting method

Publications (1)

Publication Number Publication Date
CN111911740A true CN111911740A (en) 2020-11-10

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010888385.5A Pending CN111911740A (en) 2020-08-28 2020-08-28 Pulsation damping device, screw pump and liquid pressure pulsation adjusting method

Country Status (1)

Country Link
CN (1) CN111911740A (en)

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