CN114396497B - Passive micro valve with constant flow output and method thereof - Google Patents
Passive micro valve with constant flow output and method thereof Download PDFInfo
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- CN114396497B CN114396497B CN202111662330.3A CN202111662330A CN114396497B CN 114396497 B CN114396497 B CN 114396497B CN 202111662330 A CN202111662330 A CN 202111662330A CN 114396497 B CN114396497 B CN 114396497B
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000007789 sealing Methods 0.000 claims description 16
- 230000009471 action Effects 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 4
- 238000013016 damping Methods 0.000 claims description 3
- 230000007423 decrease Effects 0.000 abstract description 6
- 239000012530 fluid Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
- F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
- F16K17/24—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member
- F16K17/28—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only
- F16K17/30—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only spring-loaded
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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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
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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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
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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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K99/00—Subject matter not provided for in other groups of this subclass
- F16K99/0001—Microvalves
- F16K99/0003—Constructional types of microvalves; Details of the cutting-off member
- F16K99/0005—Lift valves
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Safety Valves (AREA)
Abstract
The invention discloses a passive micro valve with constant flow output and a method thereof, wherein the passive micro valve comprises an upper valve cover, a valve core, a valve body, a spring and a lower valve cover which are coaxially arranged, and a plurality of grooves with the same structure are arranged on the outer side wall of an adjusting section of the valve core along the circumferential direction; a plurality of baffles which are raised towards the axle center and have the same structure are arranged on the inner side wall of the middle part of the valve body along the circumferential direction, and the number of the baffles and the number of the grooves are the same; the height of the baffle plate bulge is gradually increased along the flow direction of the medium; each groove can accommodate a baffle plate, and a clearance channel for medium to pass through can be formed between the baffle plates; the size of the clearance channel can be adjusted through the axial movement of the valve core, and the clearance channel can be closed when the groove is contacted with the tail end of the baffle. The invention realizes the increase and decrease of the inlet pressure and the corresponding increase and decrease of the flow resistance by forming the flow passage with the variable cross section through the groove on the valve core and the baffle on the valve body, thereby ensuring the stable output of the outlet flow of the passive micro valve when the inlet pressure exceeds a certain inlet pressure threshold value.
Description
Technical Field
The invention belongs to the field of microfluidic flow control micro valves, and particularly relates to a passive micro valve with constant flow output and a method thereof.
Background
Microfluidics is an emerging technology that utilizes microchannels with dimensions of tens to hundreds of microns to process minute amounts of fluids. The method has the advantages of low sample consumption and energy consumption, low cost, high safety and the like, and is widely applied to the fields of chemistry, biochemistry, biomedicine, biotechnology and the like. In order to achieve micro-scale fluid control and operation, several major components, including microsensors, micropumps, microvalves, micromixers and microchannels, constitute a microfluidic system. Thus, among these components, compact and efficient micro-valves are important for accurate control of flow.
Accurate manipulation of microfluidics is a key element in sample processing and analysis, which directly determines the reliability of microfluidic systems. The flow control of the traditional active micro valve is mainly realized by external energy consumption, the passive micro valve can realize automatic and accurate control of micro fluid without external control, and the micro valve is beneficial to realizing miniaturized integration. However, the existing passive valve cannot realize the fluid control of the low-threshold high-stability outlet flow, and is difficult to meet the actual application requirements of the portable microfluidic device. Therefore, it is important to study a passive micro valve with constant flow output and a method for stabilizing outlet flow regulation thereof.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a passive micro valve with constant flow output and a method thereof.
The specific technical scheme adopted by the invention is as follows:
In a first aspect, the present invention provides a passive microvalve having a constant flow output, comprising an upper valve cap, a valve core, a valve body, a spring, and a lower valve cap coaxially disposed; the inlet end of the valve body is detachably and closely connected with an upper valve cover with an inlet channel, and the outlet end of the valve body is detachably and closely connected with a lower valve cover with an outlet channel; the valve core is positioned in the valve body and can move along the axial direction and comprises an adjusting section and a connecting section which are coaxially connected; the outer side wall of the adjusting section is provided with a plurality of grooves with the same structure along the circumferential direction, and each groove is penetrated along the axial direction; the diameter of the connecting section is smaller than that of the adjusting section, a spring with pretightening force is sleeved on the connecting section, and the other end of the spring is propped against the inner side of the lower valve cover; in the initial state, the valve core can be propped against the inner side of the upper valve cover under the action of spring force so as to seal the inlet channel; a plurality of baffles which are raised towards the axle center and have the same structure are arranged on the inner side wall of the middle part of the valve body along the circumferential direction, and the number of the baffles and the number of the grooves are the same; the height of the baffle plate bulge is gradually increased along the flow direction of the medium; each groove can accommodate a baffle plate, and a clearance channel for medium to pass through can be formed between the baffle plates; the size of the clearance channel can be adjusted through the axial movement of the valve core, and the clearance channel can be closed when the groove is contacted with the tail end of the baffle.
Preferably, the inner side surface of the upper valve cover is coaxially provided with a sealing groove along the circumferential direction of the inlet channel, and a sealing ring is arranged in the sealing groove so as to seal the joint of the valve body and the upper valve cover.
Preferably, threads are arranged on the outer circumferences of the inlet end and the outlet end of the valve body, and the valve body is detachably connected with the upper valve cover and the lower valve cover through the threads.
Preferably, the baffle is a damping plate.
Preferably, the length of the groove and the baffle are the same.
Preferably, the inner side wall of the valve body positioned in front of the baffle plate is recessed inwards to form a storage space for temporary storage medium.
Preferably, the baffle plates are uniformly arranged along the circumferential direction of the inner side wall of the valve body, and the grooves are uniformly arranged along the circumferential direction of the outer side wall of the valve core.
Preferably, the bottom of the groove is of a flat structure.
Preferably, the width of the groove and the width of the baffle are the same.
In a second aspect, the present invention provides a method for realizing outlet flow constant by using the passive micro valve in any one of the first aspects, specifically comprising the following steps:
In the initial state, the valve core can be propped against the inner side of the upper valve cover under the action of the pretightening force of the spring so as to close the inlet channel of the upper valve cover, and the passive micro valve is in the closed state;
after the valve begins to work, a medium is introduced into the passive micro valve from the inlet channel, when the inlet pressure of the medium to the valve core is increased to be greater than the elastic force exerted on the valve core by the spring, the valve core leaves the upper valve cover, and the medium can flow out of the passive micro valve through the inlet channel, the gap channel and the outlet channel in sequence; when the inlet pressure continues to increase, the valve core gradually moves towards the outlet end; through the cooperation of the grooves and the baffle plates, the gap channel is gradually reduced, and the flow resistance of the medium in the gap channel is increased; when the inlet pressure reaches a first threshold value, the increased flow resistance of the medium in the flowing process compensates the increased inlet pressure value of the medium, so that stable output flow can be obtained; when the inlet pressure continues to increase to exceed a second threshold value, the tail end of the baffle contacts with the bottom of the groove, the gap channel is closed, and the passive micro valve is in a closed state; when the inlet pressure is reduced, the valve core gradually moves towards the inlet end; through the cooperation of the grooves and the baffle plates, the gap channel is gradually increased, and the flow resistance of the medium in the gap channel is reduced; when the inlet pressure returns to the first threshold value, the reduced flow resistance compensates for the reduced inlet pressure value, and a stable output flow can be obtained; when the inlet pressure is continuously reduced, the valve core continuously moves towards the inlet end; when the pressure of the medium inlet is reduced to be smaller than the elastic force exerted on the valve core by the spring, the valve core is propped against the upper valve cover to close the inlet channel, and the passive micro valve is restored to the closed state;
The pretightening force of the spring can be adjusted by axially moving the lower valve cover, so that different constant flow outputs under different inlet pressure thresholds can be realized.
Compared with the prior art, the invention has the following beneficial effects:
1) The invention utilizes the variable clearance channel formed between the valve core groove and the valve body baffle to realize that when the inlet pressure is increased or reduced, the flow resistance is correspondingly increased or reduced, thereby ensuring the stability of the outlet flow of the passive micro valve.
2) The device designed by the invention has compact structure, reduced manufacturing cost and low manufacturing cost, and can pointedly keep the stability of the outlet flow of the passive micro valve.
Drawings
FIG. 1 is a schematic diagram of a passive microvalve structure;
FIG. 2 is a schematic view of a valve body structure;
FIG. 3 is a schematic diagram of a valve core structure;
FIG. 4 is a schematic diagram of the flow path of a passive microvalve medium.
In the figure: 1. an upper valve cover; 2. a seal ring; 3. a valve core; 301. a groove 301; 4. a valve body; 401. a baffle; 5. a spring; 6. and a lower valve cover.
Detailed Description
The invention is further illustrated and described below with reference to the drawings and detailed description. The technical features of the embodiments of the invention can be combined correspondingly on the premise of no mutual conflict.
As shown in figure 1, the valve core ring surface of the passive micro valve provided by the invention is provided with uniformly distributed grooves, the valve body ring surface is provided with uniformly distributed height-variable baffles, and the grooves on the valve core and the baffles on the valve body form a flow passage with a variable cross section, so that the inlet pressure is increased and decreased, the flow resistance is correspondingly increased and decreased, and the stable output of the outlet flow of the passive micro valve is ensured when a certain inlet pressure threshold value is exceeded. The structure and connection of the components will be described in detail.
The passive micro valve mainly comprises an upper valve cover 1, a valve core 3, a valve body 4, a spring 5 and a lower valve cover 6, wherein the upper valve cover 1, the valve core 3, the valve body 4, the spring 5 and the lower valve cover 6 are all coaxially arranged. The valve body 4 comprises an inlet end and an outlet end, and has a cylindrical cavity inside. The inlet end of the valve body 4 is detachably connected with the upper valve cover 1 in a sealing way, and an inlet channel is formed in the central axis of the upper valve cover 1. One end of the inlet channel is communicated with the outside, and the other end is communicated with the cylindrical cavity. In practical application, the valve body 4 and the upper valve cover 1 can be in threaded connection, namely, threads are circumferentially arranged at the outer side of the inlet end of the valve body 4, and matched threads are also arranged at the inner side of one end of the upper valve cover 1, so that the valve body 4 and the upper valve cover 1 can be detachably connected through the threads. In addition, in order to guarantee the closure between the two, can set up an annular seal groove along import passageway circumference coaxial in the medial surface of upper valve gap 1, place sealing washer 2 in the seal groove to realize the junction closure of valve body 4 and upper valve gap 1. The outlet end of the valve body 4 is detachably connected with the lower valve cover 6 in a sealing way, and in practical application, the valve body 4 and the lower valve cover 6 can be in threaded connection, namely threads are circumferentially arranged on the outer side of the outlet end of the valve body 4, and threads matched with the threads are also arranged on the inner side of one end of the lower valve cover 6, so that the valve body 4 and the lower valve cover 6 are detachably connected through the threads. In addition, in order to ensure the sealing performance between the two, an annular sealing groove can be coaxially formed in the inner side surface of the lower valve cover 6 along the circumferential direction of the outlet channel, and a sealing ring 2 is placed in the sealing groove so as to realize the sealing of the joint of the valve body 4 and the lower valve cover 6.
The valve core 3 is located inside the valve body 4 and can move along the axial direction, and in particular, the valve core 3 can be pushed by the difference between the elasticity of the spring 5 and the hydraulic pressure of the imported medium. The valve core 3 comprises an adjusting section and a connecting section which are coaxially connected, wherein the adjusting section is close to the inlet end, and the connecting section is close to the outlet end. As shown in fig. 3, a plurality of grooves 301 are circumferentially formed in the outer side wall of the adjusting section, and each groove 301 has the same structure and is formed through in the axial direction. In practical use, it is necessary to ensure a flat structure of the groove bottom of each groove 301, for example, the grooves 301 may be each provided with a rectangular cross section. The diameter of the connecting section is smaller than that of the adjusting section, a spring 5 is sleeved on the connecting section, and the spring 5 has pretightening force. One end of the spring 5 is connected with the connecting section, and the other end is propped against the inner side of the lower valve cover 6. In the initial state, the valve core 3 can be propped against the inner side of the upper valve cover 1 under the action of the elastic force of the spring 5 so as to close the inlet channel of the upper valve cover 1. The elastic force of the spring 5 can be adjusted by rotating the lower valve cover 6, and the elastic force of the spring 5 can be adjusted by threads.
As shown in fig. 2, a plurality of raised baffles 401 are circumferentially arranged on the inner side wall located in the middle of the valve body 4, all the baffles 401 have the same structure, the raised directions are all oriented to the axial direction of the valve body 4 and are tangential to the inner side wall located, and the raised heights of the baffles 401 are gradually increased along the medium flowing direction. The number of the baffles 401 and the positions of the grooves 301 are the same and correspond to each other one by one, each groove 301 can accommodate one baffle 401, the baffles 401 can enter the groove 301 and move along the length direction of the groove 301, and a gap channel for medium to pass through can be formed between each group of baffles 401 and the groove 301 corresponding to the positions. When the valve core 3 moves in the axial direction, the size of the clearance channel can be adjusted, and the clearance value can be reduced or increased through the cooperation of the baffle 401 and the groove 301. When the valve core 3 moves to the bottom of the groove 301 to contact with the tail end of the baffle 401, the gap channel can be closed, so that the medium cannot flow out of the outlet channel, and the passive micro valve is in a closed state.
In practical use, the shutter 401 may be provided as a damping plate, and the grooves 301 and the shutter 401 may be provided to have the same length for better adjustment of the clearance passage. Since the medium will increase resistance after passing through the smaller gap channel after entering the valve body, the flow is slowed down, so a storage space for temporary storage medium can be provided in the valve body in front of the gap channel, i.e. the inner side wall of the valve body 4 in front of the baffle 401 is recessed inwards to form a groove structure. The shutter 401 may be uniformly disposed along the circumferential direction of the inner side wall of the valve body 4, and the groove 301 may be uniformly disposed along the circumferential direction of the outer side wall of the valve core 3. The widths of the grooves 301 and the shutter 401 may be set to be the same size in order to better control the state of the medium flowing from the gap passage.
The method for realizing the constant outlet flow by using the passive micro valve comprises the following steps:
in an initial state (namely, when the passive micro valve is free of medium), the valve core 3 can be propped against the inner side of the upper valve cover 1 under the action of the pretightening force of the spring 5, and the valve core 3 is contacted with a boss on the bottom surface of the upper valve cover 1 so as to close an inlet channel of the upper valve cover 1, and the passive micro valve is in a closed state.
After starting to work, the medium is introduced into the passive micro valve from the inlet channel, when the inlet pressure of the medium to the valve core 3 is increased to be greater than the elastic force exerted on the valve core 3 by the spring 5, the valve core 3 moves away from the upper valve cover 1, and the medium can flow out of the passive micro valve through the inlet channel, the storage space, the clearance channel and the outlet channel in sequence, as shown in fig. 4.
As the inlet pressure continues to increase, the spool 3 gradually moves toward the outlet end. By the cooperation of the grooves 301 and the baffles 401, the gap channel is gradually reduced and the flow resistance of the medium in the gap channel is increased. When the inlet pressure reaches the first threshold value, the increased flow resistance of the medium in the flowing process compensates the increased inlet pressure value, so that stable output flow can be obtained.
After the inlet pressure continues to increase beyond the second threshold, the end of the shutter 401 contacts the bottom of the recess 301, the clearance channel is closed, and the passive microvalve is in a closed state.
When the inlet pressure decreases, the spool 3 gradually moves toward the inlet end. By the cooperation of the grooves 301 and the baffles 401, the gap channel is gradually increased, and the flow resistance of the medium in the gap channel is reduced. When the inlet pressure returns to the first threshold, the reduced flow resistance compensates for the reduced inlet pressure value, and a stable output flow is achieved.
As the inlet pressure continues to decrease, the spool 3 continues to move in the direction of the inlet end. When the pressure of the medium inlet is reduced to be smaller than the elastic force exerted on the valve core 3 by the spring 5, the valve core 3 is propped against the upper valve cover 1 to close the inlet channel, and the passive micro valve is restored to the closed state.
The pre-tightening force of the spring 5 can be adjusted by axially moving the lower valve cover 6 so as to realize different constant flow output under different inlet pressure thresholds.
The invention realizes the increase and decrease of the inlet pressure and the corresponding increase and decrease of the flow resistance by forming the flow passage with the variable cross section through the groove on the valve core and the baffle on the valve body, thereby ensuring the stable output of the outlet flow of the passive micro valve when the inlet pressure exceeds a certain inlet pressure threshold value.
The above embodiment is only a preferred embodiment of the present invention, but it is not intended to limit the present invention. Various changes and modifications may be made by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present invention. Therefore, all the technical schemes obtained by adopting the equivalent substitution or equivalent transformation are within the protection scope of the invention.
Claims (10)
1. The passive micro valve with constant flow output is characterized by comprising an upper valve cover (1), a valve core (3), a valve body (4), a spring (5) and a lower valve cover (6) which are coaxially arranged; the inlet end of the valve body (4) is detachably connected with an upper valve cover (1) with an inlet channel in a sealing way, and the outlet end of the valve body is detachably connected with a lower valve cover (6) with an outlet channel in a sealing way; the valve core (3) is positioned in the valve body (4) and can move along the axial direction, and comprises an adjusting section and a connecting section which are coaxially connected; the outer side wall of the adjusting section is provided with a plurality of grooves (301) with the same structure along the circumferential direction, and each groove (301) is communicated along the axial direction; the diameter of the connecting section is smaller than that of the adjusting section, a spring (5) with pretightening force is sleeved on the connecting section, and the other end of the spring (5) is propped against the inner side of the lower valve cover (6); in an initial state, the valve core (3) can be propped against the inner side of the upper valve cover (1) under the action of the elasticity of the spring (5) so as to seal the inlet channel; a plurality of baffles (401) which are raised towards the axle center and have the same structure are arranged on the inner side wall of the middle part of the valve body (4) along the circumferential direction, and the numbers of the baffles (401) and the grooves (301) are the same; the height of the protrusions of the baffle plate (401) is gradually increased along the flow direction of the medium; each recess (301) is capable of receiving a baffle (401) which forms a clearance channel therebetween for the passage of a medium; the size of the clearance channel can be adjusted by moving the valve core (3) along the axial direction, and the clearance channel can be closed when the groove (301) is contacted with the tail end of the baffle plate (401).
2. The passive micro valve with constant flow output according to claim 1, wherein the inner side surface of the upper valve cover (1) is provided with a sealing groove coaxially along the circumferential direction of the inlet channel, and a sealing ring (2) is placed in the sealing groove to seal the joint of the valve body (4) and the upper valve cover (1).
3. The passive micro valve with constant flow output according to claim 1, wherein threads are arranged on the outer circumferences of the inlet end and the outlet end of the valve body (4), and the valve body is detachably connected with the upper valve cover (1) and the lower valve cover (6) through the threads respectively.
4. A passive microvalve having a constant flow output according to claim 1, wherein said flapper (401) is a damping plate.
5. A passive microvalve having a constant flow output according to claim 1, wherein said recess (301) and baffle (401) are the same length.
6. A passive micro valve with constant flow output according to claim 1, wherein the inner side wall of the valve body (4) in front of the shutter (401) is recessed inwards to form a storage space for temporary storage medium.
7. The passive micro valve with constant flow output according to claim 1, wherein the baffle plates (401) are uniformly arranged along the circumferential direction of the inner side wall of the valve body (4), and the grooves (301) are uniformly arranged along the circumferential direction of the outer side wall of the valve core (3).
8. A passive micro valve with constant flow output according to claim 1, wherein the groove (301) bottom is a straight structure.
9. A passive microvalve having a constant flow output according to claim 1, wherein said grooves (301) and baffles (401) are the same width.
10. A method for achieving constant outlet flow using a passive microvalve according to any one of claims 1 to 9, characterized by the following:
in an initial state, the valve core (3) can be propped against the inner side of the upper valve cover (1) under the action of the pretightening force of the spring (5) so as to close an inlet channel of the upper valve cover (1), and the passive micro valve is in a closed state;
After starting to work, medium is introduced into the passive micro valve from the inlet channel, when the inlet pressure of the medium to the valve core (3) is increased to be greater than the elastic force exerted on the valve core (3) by the spring (5), the valve core (3) leaves the upper valve cover (1), and the medium can flow out of the passive micro valve through the inlet channel, the clearance channel and the outlet channel in sequence; when the inlet pressure continues to increase, the valve core (3) gradually moves towards the outlet end; through the cooperation of the grooves (301) and the baffle plates (401), the gap channels are gradually reduced, and the flow resistance of the medium in the gap channels is increased; when the inlet pressure reaches a first threshold value, the increased flow resistance of the medium in the flowing process compensates the increased inlet pressure value of the medium, so that stable output flow can be obtained; when the inlet pressure continues to increase to exceed a second threshold value, the tail end of the baffle plate (401) is in contact with the bottom of the groove (301), the gap channel is closed, and the passive micro valve is in a closed state; when the inlet pressure is reduced, the valve core (3) gradually moves towards the inlet end; through the cooperation of the grooves (301) and the baffle plates (401), the gap channels are gradually increased, and the flow resistance of the medium in the gap channels is reduced; when the inlet pressure returns to the first threshold value, the reduced flow resistance compensates for the reduced inlet pressure value, and a stable output flow can be obtained; when the inlet pressure is continuously reduced, the valve core (3) continuously moves towards the direction of the inlet end; when the pressure of the medium inlet is reduced to be smaller than the elastic force exerted on the valve core (3) by the spring (5), the valve core (3) is propped against the upper valve cover (1) to close the inlet channel, and the passive micro valve is restored to the closed state;
the pretightening force of the spring (5) can be adjusted by axially moving the lower valve cover (6) so as to realize different constant flow output under different inlet pressure thresholds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111662330.3A CN114396497B (en) | 2021-12-31 | 2021-12-31 | Passive micro valve with constant flow output and method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111662330.3A CN114396497B (en) | 2021-12-31 | 2021-12-31 | Passive micro valve with constant flow output and method thereof |
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| CN114396497A CN114396497A (en) | 2022-04-26 |
| CN114396497B true CN114396497B (en) | 2024-05-24 |
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| ITMI20041549A1 (en) * | 2004-07-29 | 2004-10-29 | Caleffi Spa | AUTOMATIC FLOW STABILIZER VALVE |
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|---|---|---|---|---|
| US3918481A (en) * | 1974-07-16 | 1975-11-11 | Bryan Donkin Co Ltd | Gas supply apparatus |
| US5137254A (en) * | 1991-09-03 | 1992-08-11 | Caterpillar Inc. | Pressure compensated flow amplifying poppet valve |
| JP2007182939A (en) * | 2006-01-06 | 2007-07-19 | Toyota Boshoku Corp | Flow control valve |
| CN201487221U (en) * | 2009-07-24 | 2010-05-26 | 张华明 | Automatic constant pressure and constant flow valve |
| CN102797884A (en) * | 2011-05-25 | 2012-11-28 | 伟特(厦门)淋浴设备有限公司 | Water-saving valve |
| CN203856792U (en) * | 2014-05-26 | 2014-10-01 | 圣邦集团有限公司 | Deflector type shock-absorption relief valve |
| CN110360324A (en) * | 2019-07-02 | 2019-10-22 | 四川杰特机器有限公司 | A kind of multistage gap throttling pressure regulator valve |
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