US20200116146A1 - Diaphragm pump - Google Patents

Diaphragm pump Download PDF

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Publication number
US20200116146A1
US20200116146A1 US16/450,997 US201916450997A US2020116146A1 US 20200116146 A1 US20200116146 A1 US 20200116146A1 US 201916450997 A US201916450997 A US 201916450997A US 2020116146 A1 US2020116146 A1 US 2020116146A1
Authority
US
United States
Prior art keywords
air
valve seat
diaphragm pump
channel
piston
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
US16/450,997
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English (en)
Inventor
Sicheng Wang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xiamen Koge Micro Tech Co Ltd
Original Assignee
Xiamen Koge Micro Tech 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 Xiamen Koge Micro Tech Co Ltd filed Critical Xiamen Koge Micro Tech Co Ltd
Assigned to Xiamen Koge Micro Tech Co., Ltd. reassignment Xiamen Koge Micro Tech Co., Ltd. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WANG, SICHENG
Publication of US20200116146A1 publication Critical patent/US20200116146A1/en
Abandoned legal-status Critical Current

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    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • 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
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • 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
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/10—Adaptations or arrangements of distribution members
    • F04B39/102—Adaptations or arrangements of distribution members the members being disc valves
    • F04B39/1026—Adaptations or arrangements of distribution members the members being disc valves without spring
    • 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
    • F04B45/00—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids
    • F04B45/04—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids having plate-like flexible members, e.g. diaphragms
    • 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
    • F04B45/00—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids
    • F04B45/04—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids having plate-like flexible members, e.g. diaphragms
    • F04B45/043—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids having plate-like flexible members, e.g. diaphragms two or more plate-like pumping flexible members in parallel
    • 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
    • F04B45/00—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids
    • F04B45/04—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids having plate-like flexible members, e.g. diaphragms
    • F04B45/047—Pumps having electric drive

Definitions

  • the invention belongs to the technical field of pumps and more particularly relates to a diaphragm pump.
  • a diaphragm pump is commonly used for supplying compressed air to a pressurized target (such as a sphygmomanometer) and is used as a pump for deforming a diaphragm part made of an elastic material to deliver air to the pressurized target.
  • a pressurized target such as a sphygmomanometer
  • a diaphragm pump having integrated functions of filling air and releasing air needs to release the air immediately after filling the air; however, the air releasing channel is generally connected to the pressure relief airbag, wherein in order to avoid the occurrence of a phenomenon that the air is leaked while pressurizing caused by excessively rapid releasing of the air, the size of the air releasing channel is required to be extremely small. However, smaller size required for the air releasing channel causes greater difficulty of material forming and mold processing.
  • an object of the invention is to provide a diaphragm pump.
  • the diaphragm pump has the advantages that the processing difficulty of the air releasing channel can be reduced, and the requirement on extremely small size of the air releasing clearance of the air releasing channel can be met.
  • a diaphragm pump comprises an upper cover assembly, a piston assembly and a driving assembly which are connected in sequence from top to bottom, wherein the upper cover assembly is provided with an air outlet, a pressure relief opening and a communicating cavity which communicates the air outlet with the pressure relief opening;
  • the upper cover assembly comprises an upper cover body, a valve seat and a valve plate; the valve plate is arranged between the valve seat and the upper cover body; the communicating cavity is formed when the upper cover body is covered with the valve seat;
  • a pressure relief airbag used for opening or closing the pressure relief opening is arranged on the valve plate;
  • the valve seat is provided with an air inlet channel communicated with the pressure relief airbag and an air releasing channel for releasing air in the pressure relief airbag;
  • the valve plate is provided with a male part;
  • the air releasing channel is provided with a female part which is in clearance fit with the male part to form a clearance channel.
  • the air enters the pressure relief airbag through the air inlet channel when filling the air, so that the pressure relief airbag gradually swells and blocks the pressure relief opening so as to ensure that the air entering the communicating cavity is released out of the air outlet, namely the air filling process is completed.
  • the air in the pressure relief airbag is gradually released out of the air releasing channel; the pressure relief opening is gradually opened, so that the air released out of the air outlet at the beginning is released out of the pressure relief opening, and the air releasing process is completed.
  • the male part and the female part which are in clearance fit with each other are arranged on the air releasing channel; the air releasing channel can be transformed into the clearance channel which is formed between the male part and the female part, so that the processing difficulty of the air releasing channel can be reduced, and the requirement on the extremely small size of the air releasing channel can be met.
  • the diaphragm pump is further configured as follows: a flow channel area of the clearance channel between the male part and the female part is smaller than a cross sectional area of the air inlet channel.
  • the flow channel area of the clearance channel between the male part and the female part is smaller than the cross sectional area of the air inlet channel, namely air releasing velocity is smaller than air inlet velocity, so that the occurrence of a situation that the air is leaked while pressurizing caused by excessively rapid releasing of the air can be avoided, thereby ensuring that the pressure relief airbag can be normally filled with the air.
  • the diaphragm pump is further configured as follows: the male part is an air releasing pillar; and the female part is an air releasing groove.
  • the air releasing pillar and the air releasing groove cooperate to form a clearance channel with a relatively small size; and the clearance channel is conveniently processed.
  • the diaphragm pump is further configured as follows: the male part and the valve plate are integrally formed by injection molding.
  • the diaphragm pump is further configured as follows: the valve seat is provided with a positioning pillar which extends in a direction towards the valve plate and is arranged in the air releasing airbag.
  • the positioning pillar is arranged in the pressure relief airbag when the valve plate is mounted on the valve seat and is capable of preventing the pressure relief airbag from being in a shrivelled state, simultaneously reducing an inner space of the pressure relief airbag and facilitating rapid swelling and air releasing of the pressure relief airbag.
  • the diaphragm pump is further configured as follows: positioning protrusions are arranged on the upper end surface of the valve seat; positioning holes for insertion of the positioning protrusions are formed in the valve plate.
  • the valve plate can be prevented from being separated from the valve seat under actions of the positioning protrusions and the positioning holes, so that the valve plate can be mounted more stably.
  • the diaphragm pump is further configured as follows: two positioning protrusions are arranged; and a connection line between centers of the two positioning protrusions is an oblique line.
  • connection line between the centers of the two positioning protrusions is the oblique line so as to ensure that the mounting position of the valve plate is accurate and reduce time wasted when the valve plate is inversely mounted.
  • the diaphragm pump is further configured as follows: the piston assembly comprises a piston seat arranged at a lower end of the valve seat, a diaphragm part arranged between the piston seat and the valve seat and a substrate which is arranged at one end away from the valve seat of the piston seat and is in transmission connection with the driving assembly; the piston seat is provided with an air inlet; the diaphragm part is provided with a one-way inlet communicated with the air inlet and piston airbags which are located at two sides of the one-way inlet and form a pump chamber; locking holes are formed in the substrate; protrusion parts clamped in the locking holes are arranged on the piston airbags.
  • the air enters the pump chamber through the air inlet and the one-way inlet when filling the air; when the driving component enables the substrate to incline, a piston airbag corresponding to an inclined end of the substrate is squeezed, so that the air in the pump chamber is compressed and enters the valve seat through a first air inlet hole and a second air inlet hole, and the air admission process is completed.
  • the diaphragm pump is further configured as follows: positioning blocks extend in a direction from two sides of an edge of the piston seat to the valve seat; and the valve seat is provided with positioning notches which are embedded with the positioning blocks.
  • the piston seat and the valve seat are positioned more accurately under cooperation actions of the positioning blocks and the positioning notches, so that the mounting between the piston seat and the valve seat is facilitated.
  • the diaphragm pump is further configured as follows: the driving assembly comprises a motor, an eccentric wheel and a connection rod; an output shaft of the motor is fixed with the eccentric wheel; one end of the connection rod is eccentrically connected with the eccentric wheel; and the other end of the connection rod is connected with the substrate.
  • the motor drives the eccentric wheel to rotate, so that the connection rod fixed on the eccentric wheel generates reciprocating motion in a vertical direction so as to drive the substrate and the piston airbags to incline and achieve the effect of the pump.
  • the diaphragm pump has the following advantages:
  • the male part and the female part which are in clearance fit with each other are arranged on the air releasing channel, the air releasing channel can be transformed into a clearance channel which is formed between the male part and the female part, so that the processing difficulty of the air releasing channel can be reduced, and the requirement on the extremely small size of the air releasing channel can be met;
  • a minimum cross sectional area of the clearance channel between the male part and the female part is smaller than a cross sectional area of the air inlet channel, so that the occurrence of a situation that the air is leaked while pressurizing caused by excessively rapid releasing of the air can be avoided, thereby ensuring that the pressure relief airbag can be normally filled with the air;
  • the positioning pillar is arranged in the pressure relief airbag when the valve plate is mounted on the valve seat and is capable of preventing the pressure relief airbag from being in a shrivelled state, simultaneously reducing an inner space of the pressure relief airbag and facilitating rapid swelling and air releasing of the pressure relief airbag.
  • FIG. 1 is a schematic diagram of a sectional structure of Example I
  • FIG. 2 is a partial schematic diagram of a mounting structure for the valve seat and the valve plate highlighted in the Example I;
  • FIG. 3 is a schematic diagram of an explosion structure of the Example I.
  • FIG. 4 is a partial schematic diagram of the positioning pillar highlighted in Example II.
  • a diaphragm pump comprises an upper cover assembly ( 1 ), a piston assembly ( 2 ) and a driving assembly ( 3 ) which are connected in sequence from top to bottom.
  • the upper cover assembly ( 1 ) comprises an upper cover body ( 11 ), a valve seat ( 12 ) and a valve plate ( 13 );
  • the valve plate ( 13 ) is made of a rubber material and is arranged between the valve seat ( 12 ) and the upper cover body ( 11 );
  • a valve cavity matched with the shape of the valve plate ( 13 ) is formed in an upper end of the valve seat ( 12 );
  • positioning protrusions ( 121 ) extend upwards in the valve cavity; positioning holes ( 131 ) for insertion of the positioning protrusions ( 121 ) are formed in the valve plate ( 13 );
  • the valve plate ( 13 ) is mounted more stably through cooperation of the positioning protrusions ( 121 ) and the positioning holes ( 131 ).
  • two positioning protrusions ( 121 ) are arranged in the example; and a connection line between centers of the two positioning protrusions ( 121 ) is an oblique line.
  • the upper cover body ( 11 ) is provided with an air outlet ( 111 ) and a pressure relief opening ( 112 ); the communicating cavity ( 113 ) which communicates the air outlet ( 111 ) with the pressure relief opening ( 112 ) is formed when the upper cover body ( 11 ) is covered with the valve seat ( 12 ); the valve seat ( 12 ) is provided with a first air inlet hole ( 122 ) and a second air inlet hole ( 123 ); the valve plate ( 13 ) is provided with a first connection hole ( 132 ) and a second connection hole ( 133 ) which respectively correspond to the first air inlet hole ( 122 ) and the second air inlet hole ( 123 ); a first baffle ( 1321 ) and a second baffle ( 1331 ) which are used for closing upper end openings of the first air inlet hole ( 122 ) and the second air inlet hole ( 123 ) are respectively arranged in the first connection hole ( 132 ) and the
  • the first connection hole ( 132 ) is communicated with the communicating cavity ( 113 ); a closing part ( 114 ) abutted on an upper end opening of the second connection hole ( 133 ) extends from one side of the lower end of the upper cover body ( 11 ); the valve plate ( 13 ) is provided with a pressure relief airbag ( 134 ) which is used for opening or closing the pressure relief opening ( 112 ); the valve seat ( 12 ) is provided with an air inlet channel ( 1341 ) communicated with the second connection hole ( 133 ) and the pressure relief airbag ( 134 ) and an air releasing channel ( 1342 ) with one end communicated with the air inlet channel ( 1341 ); the other end of the air releasing channel ( 1342 ) is communicated with the communicating cavity ( 113 ); and the air releasing channel ( 1342 ) is capable of releasing the air in the pressure relief airbag ( 134 ).
  • the valve plate ( 13 ) is provided with a male part ( 1344 ); the air releasing channel ( 1342 ) is provided with a female part ( 1343 ) which is in clearance fit with the male part ( 1344 ) to form a clearance channel, namely air releasing velocity of the air releasing channel ( 1342 ) can be adjusted by changing the size of the clearance channel between the male part and the female part.
  • the male part ( 1344 ) is an air releasing pillar or an air releasing groove;
  • the female part ( 1343 ) is an air releasing groove or an air releasing pillar matched with the male part ( 1344 ).
  • the male part ( 1344 ) is the air releasing pillar; the female part ( 1343 ) is the air releasing groove; the air releasing pillar and the air releasing groove cooperate to form a clearance channel with a relatively small size; and the clearance channel is conveniently processed.
  • the flow channel area of the clearance channel formed between the male part ( 1344 ) and the female part ( 1343 ) in the example is smaller than the cross sectional area of the air inlet channel ( 1341 ).
  • the piston assembly ( 2 ) comprises a piston seat ( 21 ) arranged at a lower end of the valve seat ( 12 ), a diaphragm part ( 22 ) arranged between the piston seat ( 21 ) and the valve seat ( 12 ) and a substrate ( 23 ) which is arranged at one end away from the valve seat ( 12 ) of the piston seat ( 21 ) and is in transmission connection with the driving assembly ( 3 ); a cavity matched with the diaphragm part ( 22 ) is formed in the piston seat ( 21 ); the diaphragm part ( 22 ) is arranged in the cavity; the piston seat ( 21 ) is provided with an air inlet ( 211 ); the diaphragm part ( 22 ) is provided with a one-way inlet ( 221 ) communicated with the air inlet ( 211 ) and piston airbags ( 222 ) which are located at two sides of the one-way inlet ( 221 ) and form a pump chamber;
  • positioning blocks ( 212 ) extend in a direction from two sides of an edge of the piston seat ( 12 ) to the valve seat ( 21 ); and the valve seat ( 12 ) is provided with positioning notches ( 213 ) which are embedded with the positioning blocks ( 212 ); the piston seat ( 21 ) and the valve seat ( 12 ) are positioned more accurately through cooperation of the positioning blocks ( 212 ) and the positioning notches ( 213 ), so that the mounting between the piston seat ( 21 ) and the valve seat ( 12 ) is facilitated.
  • the driving assembly ( 3 ) comprises a base ( 31 ), a motor ( 32 ) and an eccentric wheel ( 33 ); the base ( 31 ) is mounted at a lower end of the piston seat ( 21 ); the motor ( 32 ) is mounted on the base ( 31 ); an output shaft of the motor ( 32 ) penetrates through the base ( 31 ) and is fixed with the eccentric wheel ( 33 ); one end away from the motor ( 32 ) of the eccentric wheel ( 33 ) is fixed with a connection rod ( 34 ) which is connected with the substrate ( 23 ); the connection rod ( 34 ) and the eccentric wheel ( 33 ) are eccentrically arranged.
  • connection rod ( 34 ) on the eccentric wheel ( 33 ) generates reciprocating motion in a vertical direction so as to drive the substrate ( 23 ) and the piston airbags ( 222 ) to incline and achieve the effect of the pump.
  • sections of the base ( 31 ), the piston seat ( 21 ) and the valve seat ( 12 ) are rectangular; and clamping grooves ( 4 ) sunken inwards are formed in edges of four sides of the base ( 31 ), the piston seat ( 21 ) and the valve seat ( 12 ). Therefore, deformation rods ( 5 ) are embedded in the clamping grooves ( 4 ) after the base ( 31 ), the piston seat ( 21 ) and the valve seat ( 12 ) are connected in sequence, so that connection of the base ( 31 ), the piston seat ( 21 ) and the valve seat ( 12 ) is firmer.
  • the first baffle is used for blocking the first connection hole ( 132 ), the air in the pressure relief airbag ( 134 ) is gradually released out of the air releasing channel ( 1342 ) and the pressure relief opening ( 112 ) is gradually opened, so that the air released out of the air outlet ( 111 ) at the beginning is released out of the pressure relief opening ( 112 ), namely the air releasing process is completed.
  • the air releasing channel ( 1342 ) can be transformed into the clearance channel which is formed between the male part ( 1344 ) and the female part, so that the processing difficulty of the air releasing channel ( 1342 ) can be reduced, and the requirement on the extremely small size of the air releasing channel ( 1342 ) can be met.
  • the difference between a diaphragm pump and the diaphragm pump of the Example I lies in that the valve seat ( 12 ) is provided with a positioning pillar ( 6 ) which extends in a direction towards the valve plate ( 13 ) and is arranged in the pressure relief airbag ( 134 ), the positioning pillar ( 6 ) is capable of preventing the pressure relief airbag ( 134 ) from being in a shrivelled state, reducing an inner space of the pressure relief airbag ( 134 ) and facilitating rapid swelling and air releasing of the pressure relief airbag ( 134 ).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
US16/450,997 2018-10-13 2019-06-24 Diaphragm pump Abandoned US20200116146A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201811192817.8 2018-10-13
CN201811192817.8A CN109139438A (zh) 2018-10-13 2018-10-13 一种隔膜泵

Publications (1)

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US20200116146A1 true US20200116146A1 (en) 2020-04-16

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ID=64811675

Family Applications (1)

Application Number Title Priority Date Filing Date
US16/450,997 Abandoned US20200116146A1 (en) 2018-10-13 2019-06-24 Diaphragm pump

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US (1) US20200116146A1 (zh)
CN (1) CN109139438A (zh)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109751224A (zh) * 2019-02-28 2019-05-14 浙江健拓医疗仪器科技有限公司 充放气装置及泵阀
CN112483368B (zh) * 2019-09-11 2024-04-16 厦门科际精密器材有限公司 隔膜泵
CN112682390A (zh) * 2020-12-29 2021-04-20 焦作市虹桥制动器股份有限公司 一种电力气动推动器
CN112709686A (zh) * 2020-12-29 2021-04-27 河源市柏尔科技有限公司 一种微型泵阀一体结构

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102817819B (zh) * 2011-06-10 2016-06-08 德昌电机(深圳)有限公司 微型气泵
JP5731576B2 (ja) * 2013-06-06 2015-06-10 応研精工株式会社 急排弁構造体およびダイヤフラムポンプ
JP6190177B2 (ja) * 2013-06-21 2017-08-30 応研精工株式会社 ダイヤフラムポンプ
CN203384026U (zh) * 2013-08-07 2014-01-08 重庆智阖康医疗器械有限公司 静音旋转式活塞泵
CN103767695B (zh) * 2014-01-21 2017-01-04 深圳金亿帝医疗设备股份有限公司 放气阀、集成气泵及电子血压计
CN207673524U (zh) * 2017-11-29 2018-07-31 厦门科际精密器材有限公司 隔膜泵
DE202018102769U1 (de) * 2018-05-17 2018-05-28 Xiamen Koge Micro Tech Co., Ltd. Membranpumpe
CN208918800U (zh) * 2018-10-13 2019-05-31 厦门科际精密器材有限公司 一种隔膜泵

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