CN110142163B - Constant-pressure backpressure system applied to piezoelectric micro-spraying mechanism - Google Patents
Constant-pressure backpressure system applied to piezoelectric micro-spraying mechanism Download PDFInfo
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- CN110142163B CN110142163B CN201910440012.9A CN201910440012A CN110142163B CN 110142163 B CN110142163 B CN 110142163B CN 201910440012 A CN201910440012 A CN 201910440012A CN 110142163 B CN110142163 B CN 110142163B
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- liquid injection
- mandrel
- baffle
- liquid supply
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- 230000007246 mechanism Effects 0.000 title claims abstract description 33
- 238000005507 spraying Methods 0.000 title claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 269
- 238000002347 injection Methods 0.000 claims abstract description 125
- 239000007924 injection Substances 0.000 claims abstract description 125
- 230000006835 compression Effects 0.000 claims abstract description 14
- 238000007906 compression Methods 0.000 claims abstract description 14
- 230000002093 peripheral effect Effects 0.000 claims abstract description 9
- 238000007789 sealing Methods 0.000 claims description 58
- 238000000605 extraction Methods 0.000 claims description 14
- 239000012530 fluid Substances 0.000 claims description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 239000007921 spray Substances 0.000 abstract description 5
- 230000009471 action Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000011324 bead Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
- B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
- B05B9/04—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump
- B05B9/0403—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump with pumps for liquids or other fluent material
- B05B9/0413—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump with pumps for liquids or other fluent material with reciprocating pumps, e.g. membrane pump, piston pump, bellow pump
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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
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/003—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by piezoelectric means
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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
- F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Nozzles (AREA)
Abstract
The invention provides a constant-pressure backpressure system applied to a piezoelectric micro-spraying mechanism, which comprises a mandrel, a baffle, a liquid injection joint, a liquid supply sleeve, a compression spring, a liquid injection piston, a pin shaft, a constant force spring, a movable piston and a flexible corrugated sleeve, wherein the mandrel is of a hollow structure, the baffle, the liquid injection joint, the liquid supply sleeve and the movable piston are sequentially arranged in the mandrel, the baffle is arranged at one end of the mandrel, and one end of the liquid injection joint extends into the baffle and is fixedly connected with the baffle. The passive pressure-stabilizing liquid supply device can realize passive pressure-stabilizing liquid supply without external control and driving, can offset the pressure loss of the micro-pipeline, realizes stable supply of micro-pressure liquid, and can ensure that the liquid is transmitted to the peripheral piezoelectric micro-spray cavity through the micro-pipeline, and the liquid cannot overflow from the nozzle when the piezoelectric micro-spray cavity does not work, thereby meeting the requirements of most piezoelectric micro-spray mechanisms on the liquid supply pressure.
Description
Technical Field
The invention belongs to the field of constant-pressure back-pressure liquid supply, and particularly relates to a constant-pressure back-pressure system applied to a piezoelectric micro-jet mechanism.
Background
The micro-droplet injection technology is widely applied to the fields of material engineering, mechanical engineering, medical treatment, chemical industry and the like at present, and the stable supply of fluid in a cavity of a micro-droplet injection mechanism depends on a matched constant-pressure back pressure system. For the piezoelectric micro-spraying mechanism, a back pressure system matched with the piezoelectric micro-spraying mechanism is required to realize stable supply of micro-pressure liquid. The existing backpressure system facing to the piezoelectric micro-spraying mechanism needs external mechanisms such as a hydraulic system, a motor system and a mechanical system, the occupied space is large, the existing pressure stabilizing system is difficult to realize the stability of small pressure, the fluctuation range of the stable pressure is large, and the general pressure fluctuation can cause that fluid overflows from a nozzle when the piezoelectric micro-spraying mechanism is in a non-working state.
Disclosure of Invention
In view of this, the invention aims to provide a constant-pressure backpressure system applied to a piezoelectric micro-jet mechanism, which is a pure mechanical structure, is not influenced by corresponding electromagnetism, has the advantages of simple structure, good stability and the like, meets the technical requirements of vacuum oil injection, and can be widely applied to the wide fields of aerospace and the like.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the constant-pressure backpressure system applied to the piezoelectric micro-spraying mechanism comprises a mandrel, a baffle, a liquid injection joint, a liquid supply sleeve, a compression spring, a liquid injection piston, a pin shaft, a constant force spring, a movable piston and a flexible corrugated sleeve, wherein the mandrel is of a hollow structure, the baffle, the liquid injection joint, the liquid supply sleeve and the movable piston are sequentially arranged in the mandrel, the baffle is arranged at one end of the mandrel, one end of the liquid injection joint extends into the baffle and is fixedly connected with the baffle, the other end of the liquid injection joint extends into one end of the liquid supply sleeve and is abutted to the liquid injection piston, the compression spring is sleeved on the liquid injection piston, the compression spring provides restoring force for the resetting of the liquid injection piston, a fluid channel is arranged between the liquid injection piston and the inner wall of the liquid supply sleeve, the other end of the liquid supply sleeve is connected and sealed with the movable piston through the flexible corrugated sleeve, the pin shaft and the constant force spring are arranged in a cavity, the liquid injection device comprises a liquid supply sleeve, a liquid injection joint, a liquid injection piston, a liquid injection joint, a liquid outlet, a.
Furthermore, one end of the mandrel is provided with a baffle end face groove limiting the axial position of the baffle, the other end of the mandrel is provided with an internal thread section, the inner wall of the mandrel is divided into a first inner ring matching surface, a third inner ring matching surface and a second inner ring matching surface along the length direction of the mandrel, the junction of the third inner ring matching surface and the second inner ring matching surface is a liquid supply sleeve limiting surface limiting the axial position of the liquid supply sleeve, the first inner ring matching surface is matched with the baffle, the second inner ring matching surface is matched with the flexible corrugated sleeve and the movable piston in a sliding contact manner, the second inner ring matching surface and the third inner ring matching surface are matched with the liquid supply sleeve, a mandrel liquid outlet is arranged at the position of the second inner ring matching surface on the mandrel, the mandrel liquid outlet is fixedly connected with the first vacuum sealing screw through threads, and an annular groove of, the mandrel liquid outlet is arranged at the bottom of the mandrel annular groove and communicated with the mandrel annular groove.
Furthermore, annotate the liquid joint including annotating liquid joint body, connect the body center at annotating liquid and seted up first notes liquid passageway along its length direction, first notes liquid passageway link up annotates the both ends of liquid joint body and forms and annotate liquid entry and annotate the liquid export, has set firmly first screwed joint at the surface of annotating the liquid joint body that is close to annotating the liquid entry, has set firmly second screwed joint at the surface of annotating the liquid joint body of annotating the liquid exit, is equipped with to annotate liquid joint location shaft shoulder at the surface between annotating the first screwed joint of liquid joint body and second screwed joint, the baffle passes through fixation nut to be fixed on first screwed joint, second screwed joint with supply liquid sleeve threaded connection.
Further, the liquid supply sleeve comprises a threaded hole, a small cylindrical hole, a second liquid injection channel and a large cylindrical hole which are arranged along the length direction of the liquid supply sleeve and are sequentially communicated, the diameter of the small cylindrical hole is smaller than that of the threaded hole, the cross-sectional dimension of the second liquid injection channel is smaller than that of the small cylindrical hole, a first sleeve limiting surface for limiting the position of a liquid injection joint is formed between the threaded hole and the small cylindrical hole, a second sleeve limiting surface for limiting the position of a compression spring is formed between the small cylindrical hole and the second liquid injection channel, a liquid supply sleeve positioning shaft shoulder is arranged on the outer surface of the liquid supply sleeve, a first annular sealing groove and a second annular sealing groove are formed in the liquid supply sleeve positioning shaft shoulder, the first annular sealing groove is matched with the first annular sealing ring, and the second annular sealing groove is matched with the second annular sealing ring to seal the mandrel and the liquid supply sleeve, and a liquid outlet of the liquid supply sleeve for enabling the fluid in the liquid supply sleeve to enter the peripheral injection device is formed in the wall of the liquid supply sleeve, and the liquid outlet of the liquid supply sleeve is communicated with the liquid outlet of the mandrel.
Further, the baffle includes the baffle body, sets up the shoulder hole that holds first screwed joint in baffle body center along its length direction, and fixation nut screws on first screwed joint and spacing on the interior shoulder of shoulder hole formation, is equipped with the baffle limiting plate in the one end of baffle body, baffle limiting plate and baffle terminal surface recess cooperation, the outer lane and the dabber cooperation of baffle body, the inner circle and the cooperation of first screwed joint of baffle body, the other end of baffle body supports and connects the location shoulder at annotating liquid.
Further, a vacuum extraction nut is matched at the internal thread section at the other end of the mandrel and matched with the second vacuum sealing screw.
Further, the vacuum extraction nut includes the nut body, has seted up nut internal thread hole at nut body center along its length direction, nut internal thread hole with second vacuum seal screw passes through threaded connection fixed, and the surface of nut body is equipped with the nut circular bead, and the surface of nut body is equipped with the screw thread section, the screw thread section cooperates with the internal thread section of dabber, is equipped with first seal gasket between nut circular bead and the dabber terminal surface, is equipped with second seal gasket between second vacuum seal screw and the nut body terminal surface.
Furthermore, a pressure plate is arranged in the flexible corrugated sleeve, one end of the flexible corrugated sleeve is pressed on the movable piston through the pressure plate and a fastening screw, and the other end of the flexible corrugated sleeve is pressed in a second annular sealing groove in the liquid supply sleeve through a second annular sealing ring.
Furthermore, the outer ring of the movable piston is in contact with the matching surface of the second inner ring of the mandrel by steel balls.
Furthermore, the constant force spring is a constant force roll type tension spring or a constant force roll type torsion spring.
Compared with the prior art, the constant-pressure back pressure system applied to the piezoelectric micro-jet mechanism has the following advantages:
the constant-pressure back pressure system applied to the piezoelectric micro-spraying mechanism can realize passive stable-pressure liquid supply without external control and driving, can offset the pressure loss of a micro-pipeline, realizes stable supply of micro-pressure liquid, and can ensure that the liquid is transmitted into a peripheral piezoelectric micro-spraying cavity through the micro-pipeline, and the liquid cannot overflow from a nozzle when the piezoelectric micro-spraying cavity does not work, thereby meeting the requirement of most piezoelectric micro-spraying mechanisms on the liquid supply pressure. The constant pressure system is of a pure mechanical structure, is not influenced by corresponding electromagnetism, has the advantages of simple structure, good stability and the like, meets the technical requirement of vacuum oil injection, and can be widely applied to the wide fields of aerospace and the like.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of a constant pressure backpressure system applied to a piezoelectric micro-jet mechanism according to an embodiment of the present invention;
FIG. 2 is an enlarged view taken at I in FIG. 1;
FIG. 3 is a schematic structural diagram of a mandrel applied to a constant pressure backpressure system of a piezoelectric micro-jet mechanism according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a baffle structure applied to a constant pressure backpressure system of a piezoelectric micro-jet mechanism according to an embodiment of the present invention;
FIG. 5 is a schematic view of a liquid injection joint applied to a constant pressure backpressure system of a piezoelectric micro-jet mechanism according to an embodiment of the present invention;
FIG. 6 is a schematic view of a liquid supply sleeve applied to a constant pressure backpressure system of a piezoelectric micro-jet mechanism according to an embodiment of the present invention;
fig. 7 is a schematic structural view of a vacuum extraction nut applied to a constant pressure backpressure system of a piezoelectric micro-jet mechanism according to an embodiment of the present invention.
Description of reference numerals:
1-mandrel, 1-1-baffle end face groove, 1-2-first inner ring matching surface, 1-3-liquid supply sleeve limiting surface, 1-4-second inner ring matching surface, 1-5-mandrel liquid outlet, 1-6-internal thread section, 1-7-mandrel annular groove, 1-8-third inner ring matching surface, 2-baffle, 2-1-baffle limiting plate, 2-2-outer ring, 2-3-internal shoulder, 2-4-inner ring, 3-fixing nut, 4-liquid injection joint, 4-1-liquid injection inlet, 4-2-first thread joint, 4-3-liquid injection joint positioning shoulder and 4-4-first liquid injection channel, 4-5-a second threaded joint, 4-6-a liquid injection outlet, 5-a liquid supply sleeve, 5-1-a threaded hole, 5-2-a first sleeve limiting surface, 5-3-a second sleeve limiting surface, 5-4-a second liquid injection channel, 5-5-a first annular sealing groove, 5-6-a liquid supply sleeve liquid outlet, 5-7-a second annular sealing groove, 5-8-a liquid supply sleeve positioning shaft shoulder, 6-a compression spring, 7-a liquid injection piston, 8-a first annular sealing ring, 9-a first vacuum sealing screw, 10-a second annular sealing ring, 11-a pin shaft, 12-a constant force spring, 13-a pressing plate, 14-a steel ball and 15-a flexible corrugated sleeve, 16-fastening screw, 17-moving piston, 18-first sealing gasket, 19-vacuum extraction nut, 19-1-nut segment, 19-2-nut shoulder, 19-3-nut internal thread hole, 20-second sealing gasket and 21-second vacuum sealing screw.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1-7, a constant pressure backpressure system applied to a piezoelectric micro-spraying mechanism comprises a mandrel 1, a baffle 2, a liquid injection joint 4, a liquid supply sleeve 5, a compression spring 6, a liquid injection piston 7, a pin shaft 11, a constant force spring 12, a movable piston 17 and a flexible corrugated sleeve 15, wherein the mandrel 1 is of a hollow structure, the baffle 2, the liquid injection joint 4, the liquid supply sleeve 5 and the movable piston 17 are sequentially arranged in the mandrel 1, the baffle 2 is arranged at one end of the mandrel 1, one end of the liquid injection joint 4 extends into the baffle 2 and is fixedly connected with the baffle 2, the other end of the liquid injection joint 4 extends into one end of the liquid supply sleeve 5 and is abutted against the liquid injection piston 7, the compression spring 6 is sleeved on the liquid injection piston 7, the compression spring 6 provides restoring force for the resetting of the liquid injection piston 7, a fluid channel is arranged between the liquid injection piston 7 and the inner wall of the liquid, the other end of the liquid supply sleeve 5 is connected and sealed with the movable piston through the flexible corrugated sleeve 5, the pin shaft 11 and the constant force spring 12 are arranged in a cavity formed by the liquid supply sleeve 5, the flexible corrugated sleeve 15 and the movable piston 17 in an enclosing mode, the pin shaft 11 is fixed in the liquid supply sleeve 5, one end of the constant force spring 12 is fixed on the pin shaft 11, the other end of the constant force spring is fixed on the movable piston 17, when external liquid is injected into the liquid injection connector 4, the liquid injection piston 7 is separated from the liquid injection connector 4, the external liquid enters the liquid supply sleeve 5 through a fluid channel after being injected into the liquid injection connector 4, when liquid injection is stopped, the liquid injection piston 7 seals the liquid injection connector 4, and liquid is supplied to the peripheral injection device through a liquid outlet which is arranged on the corresponding positions of the outer wall of the mandrel 1.
A baffle end face groove 1-1 for limiting the axial position of the baffle 2 is arranged at one end of the mandrel 1, an internal thread section 1-6 is arranged at the other end, the inner wall of the mandrel 1 is divided into a first inner ring matching surface 1-2, a third inner ring matching surface 1-8 and a second inner ring matching surface 1-4 along the length direction of the mandrel, the junction of the third inner ring matching surface 1-8 and the second inner ring matching surface 1-4 is a liquid supply sleeve limiting surface 1-3 for limiting the axial position of the liquid supply sleeve 5, the first inner ring matching surface 1-2 is matched with the baffle 2, the second inner ring matching surface 1-4 is in sliding contact fit with the flexible corrugated sleeve 15 and the movable piston 17, the second inner ring matching surface 1-4 and the third inner ring matching surface 1-8 are matched with the liquid supply sleeve 5, and a mandrel liquid outlet 1-5 is arranged at the position of the second inner ring matching surface on the mandrel, the mandrel liquid outlet 1-5 is fixedly connected with the first vacuum sealing screw 9 through threads, a mandrel annular groove 1-7 is formed in the outer surface of the mandrel 1, and the mandrel liquid outlet 1-5 is formed in the bottom of the mandrel annular groove 1-7 and communicated with the mandrel annular groove 1-7.
The liquid injection joint 4 comprises a liquid injection joint body, a first liquid injection channel 4-4 is arranged at the center of the liquid injection joint body along the length direction of the liquid injection joint body, the first liquid injection channel 4-4 penetrates through two ends of the liquid injection joint body to form a liquid injection inlet 4-1 and a liquid injection outlet 4-6, a first threaded joint 4-2 is fixedly arranged on the outer surface of the liquid injection joint body close to the liquid injection inlet 4-1, a second screwed joint 4-5 is fixedly arranged on the outer surface of the liquid injection joint body at the liquid injection outlet 4-6, a liquid injection joint positioning shaft shoulder 4-3 is arranged on the outer surface of the liquid injection joint body between the first threaded joint 4-2 and the second threaded joint 4-5, the baffle 2 is fixed on the first threaded connector 4-2 through a fixing nut 3, and the second threaded connector 4-5 is in threaded connection with the liquid supply sleeve 5.
The liquid supply sleeve 5 comprises a threaded hole 5-1, a small cylindrical hole, a second liquid injection channel 5-4 and a large cylindrical hole which are arranged along the length direction and sequentially communicated, the diameter of the small cylindrical hole is smaller than that of the threaded hole 5-1, the cross section size of the second liquid injection channel 5-4 is smaller than that of the small cylindrical hole, a first sleeve limiting surface 5-2 for limiting the position of the liquid injection joint 4 is formed between the threaded hole 5-1 and the small cylindrical hole, a second sleeve limiting surface 5-3 for limiting the position of the compression spring 6 is formed between the small cylindrical hole and the second liquid injection channel 5-4, a liquid supply sleeve positioning shaft shoulder 5-8 is arranged on the outer surface of the liquid supply sleeve 5, a first annular sealing groove 5-5 and a second annular sealing groove 5-7 are arranged on the liquid supply sleeve positioning shaft shoulder 5-8, the first annular sealing groove 5-5 is matched with the first annular sealing ring 8, the second annular sealing groove 5-7 is matched with the second annular sealing ring 10 to seal the mandrel 1 and the liquid supply sleeve 5, a liquid supply sleeve liquid outlet 5-6 enabling fluid in the liquid supply sleeve 5 to enter a peripheral injection device is formed in the wall of the liquid supply sleeve 5, and the liquid supply sleeve liquid outlet 5-6 is communicated with the mandrel liquid outlet 1-5.
The baffle 2 comprises a baffle body, a stepped hole for accommodating a first threaded connector 4-2 is formed in the center of the baffle body along the length direction of the baffle body, a fixing nut 3 is screwed on the first threaded connector 4-2 and limited on an inner shaft shoulder 2-3 formed by the stepped hole, a baffle limiting plate 2-1 is arranged at one end of the baffle body, the baffle limiting plate 2-1 is matched with a baffle end face groove 1-1, an outer ring 2-2 of the baffle body is matched with a mandrel 1, an inner ring 2-4 of the baffle body is matched with the first threaded connector 4-2, and the other end of the baffle body abuts against a liquid injection connector positioning shaft shoulder 4-3.
At the other end of the mandrel 1 a vacuum extraction nut 19 is provided, said vacuum extraction nut 19 cooperating with a second vacuum sealing screw 21.
The vacuum pumping nut 19 comprises a nut body, a nut internal thread hole 19-3 is formed in the center of the nut body along the length direction of the nut body, the nut internal thread hole 19-3 is fixedly connected with the second vacuum sealing screw 21 through threads, a nut shoulder 19-2 is arranged on the outer surface of the nut body, a thread section 19-1 is arranged on the outer surface of the nut body, the thread section 19-1 is matched with the mandrel 1, a first sealing gasket 18 is arranged between the nut shoulder 19-2 and the end face of the mandrel, and a second sealing gasket 20 is arranged between the second vacuum sealing screw 21 and the end face of the nut body.
The pressure plate 13 is arranged in the flexible corrugated sleeve 15, one end of the flexible corrugated sleeve 15 is pressed on the movable piston 17 through the pressure plate 13 and the fastening screw 16, and the other end of the flexible corrugated sleeve 15 is pressed in the second annular sealing groove 5-7 on the liquid supply sleeve 5 through the second annular sealing ring 10, so that the sealing performance of the whole system is guaranteed.
The outer ring of the movable piston 17 is in contact with the second inner ring matching surface 1-4 of the mandrel 1 through steel balls 14, rolling friction is formed among the outer ring, the second inner ring and the mandrel 1, and the friction force among the three can be adjusted through lubricating oil.
The constant force spring 12 is a constant force roll type tension spring or a constant force roll type torsion spring. The size of the back pressure can be adjusted by adjusting the specification of the constant force spring 12 and the cross-sectional area of the movable piston 17 so as to meet the requirements of different working conditions.
The working principle of the constant-pressure backpressure system is as follows:
under the normal working condition environment, the constant-pressure back pressure system is realized in the following mode: when external liquid is injected through the liquid injection joint 4, the liquid injection piston 7 is separated from the liquid injection joint 4 under the action of external liquid pressure, external liquid flows into the liquid supply sleeve 5 through the fluid channel, when liquid injection is stopped, the liquid injection piston 7 blocks the liquid injection joint 4 under the action of internal liquid pressure, liquid cannot flow back, a closed space is formed, the closed space is filled with the liquid by the liquid injection piston 7, the liquid supply sleeve 5, the first annular sealing ring 8, the second annular sealing ring 10, the flexible corrugated sleeve 15 and the movable piston 17, and the micro pressure of the liquid is determined by the pulling force of the constant force spring 12 and the cross sectional area of the piston. Therefore, the constant force spring 12 can provide a constant pressure to supply a trace amount of constant pressure fluid to the peripheral micro-spray chamber.
Under the vacuum working condition environment, the constant-pressure back pressure system is realized in the following mode: firstly, opening a first vacuum sealing screw 9, carrying out vacuum extraction at the position of a mandrel liquid outlet 1-5, wherein at the moment, a vacuum environment is formed among a liquid injection piston 7, a liquid supply sleeve 5, a first annular sealing ring 8, a second annular sealing ring 10, a flexible corrugated sleeve 15 and a movable piston 17, and the vacuum environment is sealed through threaded connection of the first vacuum sealing screw 9 and the mandrel liquid outlet 1-5. Meanwhile, the second vacuum sealing screw 21 is opened, vacuum extraction is carried out at the vacuum extraction nut 19, at the moment, the movable piston 17, the liquid supply sleeve 5 and the vacuum extraction nut 19 are in a vacuum state, and sealing of a vacuum environment is achieved through threaded connection of the second vacuum sealing screw 21 and the vacuum extraction nut 19. When external liquid is injected through the liquid injection connector 4, the liquid injection piston 7 is separated from the liquid injection connector 4 under the action of external liquid pressure, external liquid flows into the liquid supply sleeve 5 through the fluid channel, and when liquid injection is stopped, the liquid injection piston 7 blocks the liquid injection connector 4 under the action of internal liquid pressure, so that the liquid cannot flow back to form a closed space. The space enclosed by the liquid injection piston 7, the liquid supply sleeve 5, the first annular sealing ring 8, the second annular sealing ring 10, the flexible corrugated sleeve 15 and the movable piston 17 is filled with liquid, and the micro-pressure of the liquid is determined by the tension of the constant force spring 12 and the cross-sectional area of the piston. Therefore, the constant force spring 12 can provide a constant pressure to supply a trace amount of constant pressure fluid to the peripheral micro-spray chamber.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a be applied to piezoelectricity and spout constant voltage backpressure system of mechanism a little which characterized in that: the liquid injection device comprises a mandrel (1), a baffle (2), a liquid injection joint (4), a liquid supply sleeve (5), a compression spring (6), a liquid injection piston (7), a pin shaft (11), a constant force spring (12), a movable piston (17) and a flexible corrugated sleeve (15), wherein the mandrel (1) is of a hollow structure, the baffle (2), the liquid injection joint (4), the liquid supply sleeve (5) and the movable piston (17) are sequentially arranged in the mandrel (1), the baffle (2) is arranged at one end of the mandrel (1), one end of the liquid injection joint (4) extends into the baffle (2) and is fixedly connected with the baffle (2), the other end of the liquid injection joint (4) extends into one end of the liquid supply sleeve (5) and is abutted against the liquid injection piston (7), the compression spring (6) is sleeved on the liquid injection piston (7), and the compression spring (6) provides restoring force for resetting the liquid injection piston (7), a fluid channel is arranged between the liquid injection piston (7) and the inner wall of the liquid supply sleeve (5), the other end of the liquid supply sleeve (5) is connected and sealed with the movable piston through the flexible corrugated sleeve (5), the pin shaft (11) and the constant force spring (12) are arranged in a cavity formed by the liquid supply sleeve (5), the flexible corrugated sleeve (15) and the movable piston (17) in an enclosing mode, the pin shaft (11) is fixed in the liquid supply sleeve (5), one end of the constant force spring (12) is fixed on the pin shaft (11), the other end of the constant force spring is fixed on the movable piston (17), when external liquid is injected into the liquid injection joint (4), the liquid injection piston (7) is separated from the liquid injection joint (4), the external liquid enters the liquid supply sleeve (5) through the fluid channel after being injected from the liquid injection joint (4), and when the liquid injection is stopped, the liquid injection piston (7) seals the liquid injection joint (4), and a peripheral spraying device is supplied with liquid through a communicated liquid outlet arranged at the corresponding position of the outer walls of the mandrel (1) and the liquid supply sleeve (5).
2. The constant pressure backpressure system applied to the piezoelectric micro-jet mechanism is characterized in that: one end of the mandrel (1) is provided with a baffle end face groove (1-1) for limiting the axial position of the baffle (2), the other end of the mandrel is provided with an internal thread section (1-6), the inner wall of the mandrel (1) is divided into a first inner ring matching surface (1-2), a third inner ring matching surface (1-8) and a second inner ring matching surface (1-4) along the length direction of the mandrel, the junction of the third inner ring matching surface (1-8) and the second inner ring matching surface (1-4) is a liquid supply sleeve limiting surface (1-3) for limiting the axial position of the liquid supply sleeve (5), the first inner ring matching surface (1-2) is matched with the baffle (2), the second inner ring matching surface (1-4) is matched with the flexible corrugated sleeve (15) and the movable piston (17) in a sliding contact manner, and the second inner ring matching surface (1-4) and the third inner ring matching surface (1-8) are matched with the The barrel (5) is matched, a mandrel liquid outlet (1-5) is formed in the position of a second inner ring matching surface on the mandrel (1), the mandrel liquid outlet (1-5) is fixedly connected with the first vacuum sealing screw (9) through threads, a mandrel annular groove (1-7) is formed in the outer surface of the mandrel (1), and the mandrel liquid outlet (1-5) is formed in the bottom of the mandrel annular groove (1-7) and communicated with the mandrel annular groove (1-7).
3. The constant pressure backpressure system applied to the piezoelectric micro-jet mechanism is characterized in that: the liquid injection joint (4) comprises a liquid injection joint body, a first liquid injection channel (4-4) is formed in the center of the liquid injection joint body along the length direction of the liquid injection joint body, the first liquid injection channel (4-4) penetrates through two ends of the liquid injection joint body to form a liquid injection inlet (4-1) and a liquid injection outlet (4-6), a first threaded joint (4-2) is fixedly arranged on the outer surface of the liquid injection joint body close to the liquid injection inlet (4-1), a second threaded joint (4-5) is fixedly arranged on the outer surface of the liquid injection joint body at the liquid injection outlet (4-6), a liquid injection joint positioning shaft shoulder (4-3) is arranged on the outer surface of the liquid injection joint body between the first threaded joint (4-2) and the second threaded joint (4-5), and the baffle plate (2) is fixed on the first threaded joint (4-2) through a fixing nut (3), the second threaded joint (4-5) is in threaded connection with the liquid supply sleeve (5).
4. The constant pressure backpressure system applied to the piezoelectric micro-jet mechanism is characterized in that: the liquid supply sleeve (5) comprises a threaded hole (5-1), a small cylindrical hole, a second liquid injection channel (5-4) and a large cylindrical hole which are arranged along the length direction of the liquid supply sleeve and sequentially communicated, the diameter of the small cylindrical hole is smaller than that of the threaded hole (5-1), the cross-sectional dimension of the second liquid injection channel (5-4) is smaller than that of the small cylindrical hole, a first sleeve limiting surface (5-2) for limiting the position of the liquid injection joint (4) is formed between the threaded hole (5-1) and the small cylindrical hole, a second sleeve limiting surface (5-3) for limiting the position of the compression spring (6) is formed between the small cylindrical hole and the second liquid injection channel (5-4), a liquid supply sleeve positioning shaft shoulder (5-8) is arranged on the outer surface of the liquid supply sleeve (5), and a first annular sealing groove (5-5) and a second annular sealing groove (5-8) are formed on the liquid supply sleeve positioning shaft shoulder (5-8) 7) The first annular sealing groove (5-5) is matched with the first annular sealing ring (8), the second annular sealing groove (5-7) is matched with the second annular sealing ring (10) to seal the mandrel (1) and the liquid supply sleeve (5), a liquid supply sleeve liquid outlet (5-6) enabling fluid in the liquid supply sleeve (5) to enter the peripheral injection device is formed in the wall of the liquid supply sleeve (5), and the liquid supply sleeve liquid outlet (5-6) is communicated with the mandrel liquid outlet (1-5).
5. The constant pressure backpressure system applied to the piezoelectric micro-jet mechanism is characterized in that: the baffle (2) comprises a baffle body, a stepped hole for accommodating the first threaded connector (4-2) is formed in the center of the baffle body along the length direction of the baffle body, the fixing nut (3) is screwed on the first threaded connector (4-2) and limited on the inner shaft shoulder (2-3) formed by the stepped hole, a baffle limiting plate (2-1) is arranged at one end of the baffle body, the baffle limiting plate (2-1) is matched with the groove (1-1) in the end face of the baffle, the outer ring (2-2) of the baffle body is matched with the mandrel (1), the inner ring (2-4) of the baffle body is matched with the first threaded connector (4-2), and the other end of the baffle body abuts against the positioning shaft shoulder (4-3) of the liquid injection connector.
6. The constant pressure backpressure system applied to the piezoelectric micro-jet mechanism is characterized in that: and a vacuum extraction screw cap (19) is arranged at the other end of the mandrel (1), and the vacuum extraction screw cap (19) is matched with a second vacuum sealing screw (21).
7. The constant pressure backpressure system applied to the piezoelectric micro-jet mechanism is characterized in that: the vacuum extraction nut (19) comprises a nut body, a nut internal thread hole (19-3) is formed in the center of the nut body along the length direction of the nut body, the nut internal thread hole (19-3) is fixedly connected with the second vacuum sealing screw (21) through threads, a nut shoulder (19-2) is arranged on the outer surface of the nut body, a thread section (19-1) is arranged on the outer surface of the nut body, the thread section (19-1) is matched with the mandrel (1), a first sealing gasket (18) is arranged between the nut shoulder (19-2) and the end face of the mandrel, and a second sealing gasket (20) is arranged between the second vacuum sealing screw (21) and the end face of the nut body.
8. The constant pressure backpressure system applied to the piezoelectric micro-jet mechanism is characterized in that: a pressure plate (13) is arranged in the flexible corrugated sleeve (15), one end of the flexible corrugated sleeve (15) is pressed on the movable piston (17) through the pressure plate (13) and a fastening screw (16), and the other end of the flexible corrugated sleeve (15) is pressed in a second annular sealing groove (5-7) on the liquid supply sleeve (5) through a second annular sealing ring (10).
9. The constant pressure backpressure system applied to the piezoelectric micro-jet mechanism is characterized in that: and the outer ring of the movable piston (17) is in contact with a second inner ring matching surface (1-4) of the mandrel (1) by adopting a steel ball (14).
10. The constant pressure backpressure system applied to the piezoelectric micro-jet mechanism is characterized in that: the constant force spring (12) is a constant force roll type tension spring or a constant force roll type torsion spring.
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| CN201910440012.9A CN110142163B (en) | 2019-05-24 | 2019-05-24 | Constant-pressure backpressure system applied to piezoelectric micro-spraying mechanism |
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|---|---|---|---|
| CN201910440012.9A CN110142163B (en) | 2019-05-24 | 2019-05-24 | Constant-pressure backpressure system applied to piezoelectric micro-spraying mechanism |
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| CN110142163B true CN110142163B (en) | 2020-04-24 |
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| CN106885120A (en) * | 2017-03-21 | 2017-06-23 | 哈尔滨工业大学 | A kind of micro injection lubricating arrangement of diaphragm seal formula Piezoelectric Driving |
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| US7481337B2 (en) * | 2004-04-26 | 2009-01-27 | Georgia Tech Research Corporation | Apparatus for fluid storage and delivery at a substantially constant pressure |
| CN203742925U (en) * | 2013-11-18 | 2014-07-30 | 江苏大学 | Magnetostrictive rod driven micro pump |
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|---|---|
| CN110142163A (en) | 2019-08-20 |
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