CN110886901B - Substrate, phase change valve and control method thereof - Google Patents
Substrate, phase change valve and control method thereof Download PDFInfo
- Publication number
- CN110886901B CN110886901B CN201911143244.4A CN201911143244A CN110886901B CN 110886901 B CN110886901 B CN 110886901B CN 201911143244 A CN201911143244 A CN 201911143244A CN 110886901 B CN110886901 B CN 110886901B
- Authority
- CN
- China
- Prior art keywords
- phase change
- groove
- change material
- flow
- melting point
- 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.)
- Active
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- 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
- F16K99/0034—Operating means specially adapted for microvalves
- F16K99/0036—Operating means specially adapted for microvalves operated by temperature variations
-
- 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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/002—Actuating devices; Operating means; Releasing devices actuated by temperature variation
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Temperature-Responsive Valves (AREA)
Abstract
The invention provides a substrate, a phase change valve and a control method thereof, which relate to the technical field of microfluidics and comprise the following steps: the substrate comprises a substrate body, wherein a through groove is formed in the substrate body; a flow blocking body is arranged in the through groove, and the flow cross-sectional area of the through groove is larger than the flow blocking cross-sectional area of the flow blocking body; the fluid blocking body is provided with a first groove, and a second groove is arranged in the first groove. In the technical scheme, the choke body is provided with the first groove and the second groove, the first phase-change material and the second phase-change material with different melting points are respectively filled in the first groove and the second groove, and the first phase-change material or the second phase-change material can be heated and melted to open the fluid channel or cooled and solidified to block the fluid channel after being heated and expanded by utilizing the characteristics of the first phase-change material and the second phase-change material with different melting points, so that the same microchannel is operated to realize multiple opening and closing.
Description
Technical Field
The invention relates to the technical field of microfluidics, in particular to a substrate, a phase change valve and a control method of the phase change valve.
Background
In microfluidic systems, microvalves are one of the key devices. The micro valve can play a role in controlling and limiting flow in the micro channel, and the reliability, the integration level, the processing cost and the like of the micro valve have great influence on the whole micro-fluidic system. The paraffin valve belongs to a phase change valve, and in the development process of the phase change valve, the paraffin has the characteristics of low melting point, easy plastic deformation and the like, and is earlier used for designing and manufacturing the phase change valve.
At present, most of phase change valves are of disposable structures, namely, the phase change valve in a closed state cannot be restored to the closed state after being opened, or the phase change valve in an opened state cannot be restored to the closed state again after being closed and reopened, so that the same microchannel cannot be operated to realize multiple opening and closing.
Disclosure of Invention
The invention aims to provide a substrate, a phase change valve and a control method thereof, and aims to solve the technical problem that the phase change valve in the prior art cannot control the same microchannel to be opened and closed for multiple times.
The invention provides a substrate, comprising:
the substrate comprises a substrate body, wherein at least one through groove is formed in the substrate body;
at least one bluff body is arranged in the through groove, and the flow cross section area of the through groove is larger than the flow cross section area of any bluff body; the flow blocking body is provided with at least one first groove, and the first groove is internally provided with at least one second groove.
Further, the maximum flow-resisting section width of the flow-resisting body is equal to the maximum flow-through section width of the through groove, and the maximum flow-resisting section height of the flow-resisting body is smaller than the maximum flow-through section height of the through groove; the first groove is formed in the top end face of the flow blocking body.
Further, at least one side wall of the first groove is a side wall of the through groove.
Further, two opposite side walls of the first groove in the width direction of the through groove are two side walls of the through groove.
Further, at least one third groove is arranged on the substrate body;
the third groove is communicated with the first groove; or the third groove is communicated with the first groove and the second groove.
The invention also provides a phase change valve, which comprises the substrate; the cover plate is oppositely covered with the base plate; the inner surface of the cover plate and the through groove form a fluid channel, and a through-flow gap is formed between the fluid blocking body and the fluid channel.
Furthermore, a first phase change material is filled in the first groove, a second phase change material is filled in the second groove, and the through-flow gap is in a through state;
the melting point of the first phase change material is lower than the melting point of the second phase change material.
Furthermore, a first phase change material is filled in the first groove and the through-flow gap, a second phase change material is filled in the second groove, and the through-flow gap is in a blocking state;
the melting point of the first phase change material is lower than the melting point of the second phase change material.
Further, a first phase change material is filled in the first groove, a second phase change material is filled in the second groove, a third phase change material is filled in the through-flow gap, and the through-flow gap is in a blocking state;
the melting point of the third phase change material is lower than the melting point of the first phase change material, and the melting point of the first phase change material is lower than the melting point of the second phase change material.
The invention also provides a phase-change valve, which comprises the substrate; the cover plate is oppositely covered with the base plate; the inner surface of the cover plate and the through groove form a fluid channel, and a through-flow gap is formed between the fluid blocking body and the fluid channel.
Furthermore, a first phase change material is filled in the third groove, a second phase change material is filled in the second groove, and the through-flow gap is in a through state;
the melting point of the first phase change material is lower than the melting point of the second phase change material.
Furthermore, a first phase change material is filled in the third groove, a second phase change material is filled in the second groove, a third phase change material is filled in the first groove and the through-flow gap, and the through-flow gap is in a blocking state;
the melting point of the third phase change material is lower than the melting point of the first phase change material, and the melting point of the first phase change material is lower than the melting point of the second phase change material.
Furthermore, the cover plate is provided with at least one filling opening communicated with the fluid channel.
Further, the phase change valve further includes:
a seal removably sealed to the pour spout.
Further, the phase change valve further includes:
a heating device in thermally conductive connection with the base plate and/or the cover plate.
Further, the cover plate and the base plate are oppositely assembled in a bonding mode.
The invention also provides a control method of the phase change valve, which is based on the phase change valve and comprises the following steps:
when the through-flow gap is in a blocking state, heating and melting the phase change material blocking the through-flow gap so as to penetrate through the through-flow gap and keep other phase change materials in the groove in a solidification state;
and when the through-flow gap is in a through state, the phase change material with the lowest current melting point in the groove is cooled and solidified after being heated and expanded so as to plug the through-flow gap.
In the above technical solution, the choke body is provided with not only the first groove, but also the second groove, and the first phase change material and the second phase change material with different melting points are respectively filled in the first groove and the second groove, and the first phase change material or the second phase change material can be heated and melted to open the fluid channel, or cooled and solidified to block the fluid channel after being heated and expanded by using the characteristics of the first phase change material and the second phase change material with different melting points. Thereby operating the same microchannel to open and close multiple times.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a perspective view of a substrate provided in accordance with one embodiment of the present invention;
FIG. 2 is a schematic view of the phase change material fill of the substrate shown in FIG. 1;
FIG. 3 is a schematic view 2 of the phase change material fill of the substrate shown in FIG. 1;
FIG. 4 is a schematic view of the phase change material fill of the substrate shown in FIG. 1;
FIG. 5 is a schematic view 4 of the phase change material fill of the substrate shown in FIG. 1;
FIG. 6 is a perspective view of a substrate provided in accordance with another embodiment of the present invention;
FIG. 7 is a schematic view of the phase change material fill of the substrate of FIG. 6;
FIG. 8 is a schematic view of the phase change material fill of the substrate of FIG. 6;
FIG. 9 is a schematic view of the phase change material fill of the substrate of FIG. 6;
FIG. 10 is a cross-sectional view of a substrate provided in accordance with one embodiment of the present invention;
FIG. 11 is a cross-sectional view of a substrate provided in accordance with another embodiment of the present invention;
FIG. 12 is a cross-sectional view of a substrate provided in accordance with yet another embodiment of the present invention;
fig. 13 is a perspective view of a phase change valve according to an embodiment of the present invention.
Fig. 14 is a perspective view of a phase change valve according to another embodiment of the present invention.
Reference numerals:
1. a substrate body; 2. a bluff body; 3. a cover plate;
11. a through groove; 12. a flow cross section;
13. a flow-impeding cross-section; 14. a through-flow gap;
15. a first phase change material; 16. a second phase change material;
17. a third phase change material;
21. a first groove; 22. a second groove;
23. a third groove; 31. an infusion port.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, the present embodiment provides a substrate, including:
the substrate comprises a substrate body 1, wherein at least one through groove 11 is formed in the substrate body 1; at least one bluff body 2 is arranged in the through groove 11, and the area of a through-flow section 12 of the through groove 11 is larger than that of a flow-blocking section 13 of any one bluff body 2; the choke body 2 is provided with at least one first groove 21, and at least one second groove 22 is arranged in the first groove 21.
It should be noted that the through groove 11 is a groove structure with two ends not closed. The flow cross section 12 is the cross section of the through channel 11 perpendicular to the liquid flow direction, also referred to as flow cross section. The flow-blocking section 13 is a section of the fluid-blocking body 2 perpendicular to the flow direction of the fluid, and the flow-blocking section 13 can block the fluid from flowing along the preset flow direction. The fluid passage is a passage formed by the cover plate 3 and the through groove 11 on the base plate for passing fluid after the base plate is covered by the cover plate 3. The flow gap 14 is the gap structure left by the portion of the flow cross section 12 minus the portion of the flow blocking cross section 13, and in this embodiment, the flow gap 14 is formed by a gap between the fluid channel, in which the flow gap 14 is also located, and the through groove 11 belongs to a portion of the fluid channel, and the fluid blocking body 2.
The material of the substrate body 1 may be one or more of glass, silicon, polymethyl methacrylate (PMMA), Polystyrene (PS), Polycarbonate (PC), Cyclic Olefin Copolymer (COC), polyethylene terephthalate (PET), and the like.
With continued reference to fig. 1, in the substrate structure provided in this embodiment, two ends of the through slot 11 penetrate through the substrate body 1, and the fluid blocking body 2 is located in the slot of the through slot 11. The area of the through-flow section 12 of the through groove 11 is larger than the area of the flow blocking section 13 of the fluid blocking body 2, and a part of the gap structure is left by the part of the through-flow section 12 minus the flow blocking section 13. Referring to fig. 10 to 12, when the substrate body 1 is covered with the cover plate 3, a through-flow gap 14 is formed between the through-slot 11 and the baffle 2.
With continued reference to fig. 10 to 12, the through-flow gap 14 can be formed on the upper, left or right side of the flow blocking body 2. For example, in one embodiment, the width of the maximum flow blocking section 13 of the fluid blocking body 2 is equal to the width of the maximum flow section 12 of the through slot 11, and the height of the maximum flow blocking section 13 of the fluid blocking body 2 is smaller than the height of the maximum flow section 12 of the through slot 11, and at this time, the flow gap 14 is located at the top end surface of the fluid blocking body 2 according to the above-mentioned correspondence relationship between the flow sections 12 and 13. According to this structure, the first recess 21 can be opened at the tip end face of the choke body 2. In this regard, a person skilled in the art can set the assembling structure of the fluid blocking body 2 between the through slot 11 and the forming structure of the actual through-flow gap 14 according to requirements, which are not described herein again.
In accordance with the configuration of the flow gap 14, the first recess 21 provided on the flow resistor 2 also faces the flow gap 14, so that, after filling the interior of the first recess 21 with the corresponding phase change material, the flow gap 14 can be closed in the corresponding state by means of the phase change material. For example, the flow gap 14, i.e. the fluid channel, can be opened when the phase change material is melted by heating, with the fluid being introduced. Meanwhile, the through-flow gap 14 can be blocked after the phase-change material is heated, expanded, cooled and cooled. The phase-change material may be wax, such as natural wax, paraffin wax, microcrystalline wax, etc. In addition, the phase change material may be a thermoplastic resin, a phase change metal material, or the like, and is not limited herein. In addition, the phase change materials with different melting points used in the same phase change valve can adopt the phase change materials with the same category or different categories, as long as the difference of the melting points is ensured.
It should be noted that, the choke body 2 is not only provided with the first groove 21, but also provided with the second groove 22 in the first groove 21, and the first phase-change material 15 and the second phase-change material 16 with different melting points are respectively filled in the first groove 21 and the second groove 22, and by utilizing the characteristics of the first phase-change material 15 and the second phase-change material 16 with different melting points, the first phase-change material 15 or the second phase-change material 16 can be heated and melted to open the fluid passage, or the first phase-change material 15 or the second phase-change material 16 is cooled and solidified after being heated and expanded to block the fluid passage. Thereby operating the same microchannel to open and close multiple times, as will be described in detail below.
Wherein, with continued reference to fig. 1, at least one sidewall of the first groove 21 is a sidewall of the through slot 11. For example, in one embodiment, two opposite side walls of the first groove 21 in the width direction of the through groove 11 are two side walls of the through groove 11. In this case, the first groove 21 is formed by two side walls of the through groove 11 and two side walls formed by recessing the spoiler 2 up and down, and besides, those skilled in the art may set the first groove 21 to have other structures or shapes according to the requirement, for example, the cross section of the first groove 21 may be circular, triangular, etc., which is not limited herein. The heating device for heating the corresponding phase change material may be, for example, a laser, a halogen lamp, a hot plate, a hot air gun, etc., or the heating device may be directly integrated on the substrate, such as a resistance heater, etc. The number of the heating devices used may be one or more, and may be determined according to the number of the phase change valves used, the manufacturing cost, and other factors.
The invention also provides a phase-change valve, which comprises the substrate; the cover plate 3 is covered with the base plate oppositely; the inner surface of the cover plate 3 and the through groove 11 form a fluid passage, and a through-flow gap 14 is formed between the choke body 2 and the fluid passage. The cover plate 3 and the substrate are oppositely bonded and assembled, and the bonding and assembling mode of the cover plate 3 and the substrate can be one or more modes of laser bonding assembly, ultrasonic bonding assembly, hot-pressing bonding assembly, adhesive bonding assembly and the like.
Based on the phase change valve structure having the first groove 21 and the second groove 22, referring to fig. 2 and 4, in one filling embodiment, the first groove 21 is filled with the first phase change material 15, the second groove 22 is filled with the second phase change material 16, and the through-flow gap is in a through state; the melting point of the first phase change material 15 is lower than the melting point of the second phase change material 16. The substrate structure formed by the method can realize the functions of two-opening and three-opening after being covered and assembled with the adaptive cover plate 3, namely, the same fluid channel can be operated to realize two-time opening and two-time closing. At this time, the initial state of the phase change valve is also taken into consideration.
Specifically, the molten second phase change material 16 may be filled into the second groove 22 and cooled to solidify, and then the molten first phase change material 15 may be filled into the first groove 21 and cooled to solidify. After the base plate and the cover plate 3 are assembled in a covering manner, the through-flow gap 14 is not blocked at this time, and the initial state of the fluid passage is open.
When it is desired to close the reusable phase change valve, the first phase change material 15 may be heated to a temperature range of its melting point, causing the first phase change material 15 to melt. At this point, the volume of the first phase change material 15 expands after melting, and the expanded volume exceeds the sum of the volumes of the first recess 21 and the through-flow gap 14. Therefore, the first phase change material 15 fills the first recess 21 and the through-flow gap 14 by capillary action, and when it cools and solidifies, it blocks the through-flow gap 14, so that the fluid passage is closed.
When it is desired to open the reusable phase change valve, the first phase change material 15 is continuously heated to a temperature range of its melting point, causing the first phase change material 15 to melt. Fluid is then introduced into the fluid passage, along which it flows through the flow-through gap 14. At this time, the first phase change material 15 in a partially or completely molten state can be flushed away by the external force of the fluid due to the flow, and then the fluid passes through the through-flow gap 14, so that the fluid passage is opened.
When it is desired to close the reusable phase change valve a second time, the introduction of fluid into the fluid passageway is stopped and the second phase change material 16 is heated to a temperature range of its melting point to melt the second phase change material 16. At this time, the second phase change material 16 and the first phase change material 15 remaining when the phase change valve was opened at the previous time are melted at the same time, and the volumes of the two melted materials expand to exceed the sum of the volumes of the first groove 21, the second groove 22, and the through-flow gap 14. Therefore, the second phase change material 16 and the first phase change material 15 remaining when the phase change valve was opened last time fill the first groove 21, the second groove 22 and the through-flow gap 14 by capillary action, and when the two materials are cooled and solidified, the through-flow gap 14 can be blocked, so that the fluid passage is closed. In addition, the heating state may be maintained to be continuously heated during a period from the previous time when the phase change valve is opened to the current time when the phase change valve is closed, or the heating may be stopped, and the flow of the fluid is not affected during the period.
When it is desired to open the reusable phase change valve a second time, similar to the method described above, the second phase change material 16 is heated to a temperature in the range of its melting point, causing the second phase change material 16 to melt. Fluid is then introduced into the fluid passage, along which it flows through the flow-through gap 14. At this time, the second phase change material 16 in a partially or completely molten state can be flushed away by the external force of the fluid due to the flow, and then the fluid passes through the through-flow gap 14, so that the fluid passage is opened. In summary, three openings and two closings of the same fluid channel can be operated.
It should be noted that the expansion volume of the corresponding phase change material and the volume in the groove of the corresponding groove may be set correspondingly according to actual conditions, so as to ensure that the through-flow gap 14 is sufficiently blocked after the phase change material is heated, expanded, cooled and solidified. For example, the volume of paraffin generally expands by about 10% to 15% after being heated and melted, so that the volume ratios of the first groove 21, the second groove 22 and the through-flow gap 14 may be set correspondingly when paraffin is used as the phase change material, and details thereof are not repeated herein.
Referring to fig. 2 and 3, in another filling embodiment, the first groove 21 and the through-flow gap 14 are filled with a first phase change material 15, the second groove 22 is filled with a second phase change material 16, and the through-flow gap is in a blocked state; the melting point of the first phase change material 15 is lower than the melting point of the second phase change material 16. The substrate structure formed by the method can realize the functions of two closing and two opening after being covered and assembled with the adaptive cover plate 3, namely, the same fluid channel can be operated to realize two times of opening and two times of closing. At this time, the initial state of the phase change valve is also taken into consideration.
As can be seen from the above, the molten second phase change material 16 may be filled into the second recess 22 and cooled and solidified to be fixed, and then the molten first phase change material 15 may be filled into the first recess 21 and cooled and solidified to be fixed, and at the same time, the first phase change material 15 may be cooled and solidified to block the through-flow gap 14. After the base plate and the cover plate 3 are assembled in a covering mode, the through-flow gap 14 is blocked by the first phase change material 15, and the fluid channel is closed in the initial state.
When it is desired to open the reusable phase change valve, the first phase change material 15 is first heated to a temperature range of its melting point, causing the first phase change material 15 to melt. Fluid is then introduced into the fluid passage, for example by using a syringe pump to drive the fluid in a predetermined direction within the fluid passage, so that the fluid flows along the fluid passage through the flow-through gap 14. At this time, the first phase change material 15 in a partially or completely molten state can be flushed away by the external force of the fluid due to the flow, and then the fluid passes through the through-flow gap 14, so that the fluid passage is opened.
When it is desired to close the reusable phase change valve, the passage of fluid into the fluid passageway is stopped and the second phase change material 16 is heated to a temperature range of its melting point to melt the second phase change material 16. At this time, the second phase change material 16 and the first phase change material 15 remaining when the phase change valve was opened at the previous time are melted at the same time, and the volumes of the two melted materials expand to exceed the sum of the volumes of the first groove 21, the second groove 22, and the through-flow gap 14. Therefore, the second phase change material 16 and the first phase change material 15 remaining when the phase change valve was opened last time fill the first groove 21, the second groove 22 and the through-flow gap 14 by capillary action, and when the two materials are cooled and solidified, the through-flow gap 14 can be blocked, so that the fluid passage is closed. In addition, the heating state may be maintained to be continuously heated during a period from the previous time when the phase change valve is opened to the current time when the phase change valve is closed, or the heating may be stopped, and the flow of the fluid is not affected during the period.
When it is desired to open the reusable phase change valve a second time, similar to the method described above, the second phase change material 16 is heated to a temperature in the range of its melting point, causing the second phase change material 16 to melt. Fluid is then introduced into the fluid passage, along which it flows through the flow-through gap 14. At this time, the second phase change material 16 in a partially or completely molten state can be flushed away by the external force of the fluid due to the flow, and then the fluid passes through the through-flow gap 14, so that the fluid passage is opened. In summary, the same fluid channel can be operated to open and close twice.
Referring to fig. 2, 4 and 5, in a further filling embodiment, the first groove 21 is filled with a first phase change material 15, the second groove 22 is filled with a second phase change material 16, the through-flow gap 14 is filled with a third phase change material 17, and the through-flow gap 14 is in a blocked state; the melting point of the third phase change material 17 is lower than the melting point of the first phase change material 15, and the melting point of the first phase change material 15 is lower than the melting point of the second phase change material 16. The substrate structure formed by the method can realize the three-opening and three-closing function after being covered and assembled with the adaptive cover plate 3, namely, the same fluid channel can be operated to realize three-time opening and three-time closing. At this time, the initial state of the phase change valve is also taken into consideration.
As can be seen from the above, the molten second phase change material 16 may be filled into the second recess 22 and cooled to solidify for fixing, the molten first phase change material 15 may be filled into the first recess 21 and cooled to solidify for fixing, and the molten third phase change material 17 may be filled into the through-flow gap 14 and cooled to solidify for blocking the through-flow gap 14. At this time, after the base plate and the cover plate 3 are fitted, the through-flow slit 14 is closed by the third phase change material 17, and the fluid passage is initially closed.
When it is desired to open the reusable phase change valve, the third phase change material 17 is first heated to a temperature range of its melting point, causing the third phase change material 17 to melt. Fluid is then introduced into the fluid passage, along which it flows through the flow-through gap 14. At this time, the fluid may wash away the third phase change material 17 in a partially or completely molten state by the external force of the fluid due to the flow, and further penetrate through the through-flow gap 14, so that the fluid passage is opened.
When the reusable phase change valve needs to be closed, the fluid is stopped from being introduced into the fluid channel, and the first phase change material 15 is continuously heated to the temperature range of the melting point of the first phase change material, so that the first phase change material 15 is melted. At this time, the first phase change material 15 and the third phase change material 17 remaining when the previous phase change valve was opened are simultaneously melted, and the volumes of the melted first phase change material and the melted third phase change material are expanded to exceed the sum of the volumes of the first groove 21 and the through-flow gap 14. Therefore, the first phase change material 15 and the third phase change material 17 remaining when the phase change valve was opened last time fill the first recess 21 and the through-flow gap 14 by capillary action, and when the two are cooled and solidified, the through-flow gap 14 can be blocked, so that the fluid passage is closed. In addition, the heating state may be maintained to be continuously heated during a period from the previous time when the phase change valve is opened to the current time when the phase change valve is closed, or the heating may be stopped, and the flow of the fluid is not affected during the period.
When it is desired to open the reusable phase change valve a second time, similar to the method described above, the first phase change material 15 is heated to a temperature range of its melting point, causing the first phase change material 15 and the third phase change material 17 remaining from the previous phase change valve opening to melt. Fluid is then introduced into the fluid passage, along which it flows through the flow-through gap 14. At this time, the first phase change material 15 in a partially or completely molten state can be flushed away by the external force of the fluid due to the flow, and then the fluid passes through the through-flow gap 14, so that the fluid passage is opened.
When it is desired to close the reusable phase change valve a second time, the introduction of fluid into the fluid passageway is stopped and the second phase change material 16 is heated to a temperature range of its melting point to melt the second phase change material 16. At this time, the second phase change material 16 and the first phase change material 15 remaining when the phase change valve was opened at the previous time are melted at the same time, and the volumes of the two melted materials expand to exceed the sum of the volumes of the first groove 21, the second groove 22, and the through-flow gap 14. Therefore, the second phase change material 16 and the first phase change material 15 remaining when the phase change valve was opened last time fill the first groove 21, the second groove 22 and the through-flow gap 14 by capillary action, and when the two materials are cooled and solidified, the through-flow gap 14 can be blocked, so that the fluid passage is closed.
When it is desired to open the reusable phase change valve three times, the second phase change material 16 is melted by heating the second phase change material 16 to a temperature in the range of its melting point, similar to the method described above. Fluid is then introduced into the fluid passage, along which it flows through the flow-through gap 14. At this time, the second phase change material 16 in a partially or completely molten state can be flushed away by the external force of the fluid due to the flow, and then the fluid passes through the through-flow gap 14, so that the fluid passage is opened. In summary, three openings and three closings of the same fluid channel can be operated.
The invention also provides another phase change valve, which comprises the substrate; the cover plate 3 is covered with the base plate oppositely; the inner surface of the cover plate 3 and the through groove 11 form a fluid passage, and a through-flow gap 14 is formed between the choke body 2 and the fluid passage. The cover plate 3 and the substrate are oppositely bonded and assembled, and the bonding and assembling mode of the cover plate 3 and the substrate can be one or more modes of laser bonding assembly, ultrasonic bonding assembly, hot-pressing bonding assembly, adhesive bonding assembly and the like.
As shown in fig. 6, in the phase change valve structure having the first groove 21 and the second groove 22, at least one third groove 23 is provided on the substrate body 1; the third groove 23 is communicated with the first groove 21; alternatively, the third groove 23 communicates with both the first groove 21 and the second groove 22.
Based on the structure of the substrate body 1 having the first groove 21, the second groove 22, and the third groove 23, referring to fig. 6 to 8, in one filling embodiment, the third groove 23 is filled with the first phase change material 15, the second groove 22 is filled with the second phase change material 16, and the through gap 14 is in a through state; the melting point of the first phase change material 15 is lower than the melting point of the second phase change material 16. The substrate structure formed by the method can realize the functions of two-time opening and three-time opening after being covered and assembled with the adaptive cover plate 3, namely, the same fluid channel can be operated to realize three-time opening and two-time closing. At this time, the initial state of the phase change valve is also taken into consideration.
From the above, it is possible to fill the second phase change material 16 melted into the second groove 22 and cool and solidify it to fix, while filling the first phase change material 15 melted into the third groove 23 cool and solidify it to fix. Alternatively, the molten second phase change material 16 is first filled into the second groove 22 and the bottom of the third groove 23 and allowed to cool and solidify to be fixed, and then the molten first phase change material 15 is filled into the top of the third groove 23 and cooled and solidified to be fixed. After the base plate and the cover plate 3 are assembled in a covering manner, the through-flow gap 14 is not blocked at this time, and the initial state of the fluid passage is open.
When it is desired to close the reusable phase change valve, the first phase change material 15 is first heated to a temperature range of its melting point, causing the first phase change material 15 to melt. At this point, the volume of the first phase change material 15 expands after melting, and the expanded volume exceeds the sum of the volumes of the first recess 21 and the through-flow gap 14. Therefore, the first phase change material 15 fills the first recess 21 and the through-flow gap 14 by capillary action, and when it cools and solidifies, it blocks the through-flow gap 14, so that the fluid passage is closed.
When it is desired to open the reusable phase change valve, the first phase change material 15 is heated to a temperature range of its melting point, causing the first phase change material 15 to melt. Fluid is then introduced into the fluid passage, along which it flows through the flow-through gap 14. At this time, the first phase change material 15 in a partially or completely molten state can be flushed away by the external force of the fluid due to the flow, and then the fluid passes through the through-flow gap 14, so that the fluid passage is opened.
When it is desired to close the reusable phase change valve a second time, the introduction of fluid into the fluid passageway is stopped and the second phase change material 16 is heated to a temperature range of its melting point to melt the second phase change material 16. At this time, the second phase change material 16 and the first phase change material 15 remaining when the phase change valve was opened at the previous time are melted at the same time, and the volumes of the two melted materials expand to exceed the sum of the volumes of the first groove 21, the second groove 22, and the through-flow gap 14. Therefore, the second phase change material 16 and the first phase change material 15 remaining when the phase change valve was opened last time fill the first groove 21, the second groove 22 and the through-flow gap 14 by capillary action, and when the two materials are cooled and solidified, the through-flow gap 14 can be blocked, so that the fluid passage is closed. In addition, the heating state may be maintained to be continuously heated during a period from the previous time when the phase change valve is opened to the current time when the phase change valve is closed, or the heating may be stopped, and the flow of the fluid is not affected during the period.
When it is desired to open the reusable phase change valve a second time, similar to the method described above, the second phase change material 16 is heated to a temperature in the range of its melting point, causing the second phase change material 16 to melt. Fluid is then introduced into the fluid passage, along which it flows through the flow-through gap 14. At this time, the second phase change material 16 in a partially or completely molten state can be flushed away by the external force of the fluid due to the flow, and then the fluid passes through the through-flow gap 14, so that the fluid passage is opened. In summary, three openings and two closings of the same fluid channel can be operated.
Referring to fig. 9, in another filling embodiment, the third groove 23 is filled with the first phase change material 15, the second groove 22 is filled with the second phase change material 16, the first groove 21 and the through-flow gap 14 are filled with the third phase change material 17, and the through-flow gap 14 is in a blocked state; the melting point of the third phase change material 17 is lower than the melting point of the first phase change material 15, and the melting point of the first phase change material 15 is lower than the melting point of the second phase change material 16. The substrate structure formed by the method can realize the three-opening and three-closing function after being covered and assembled with the adaptive cover plate 3, namely, the same fluid channel can be operated to realize three-time opening and three-time closing. At this time, the initial state of the phase change valve is also taken into consideration.
As is clear from the above, the molten second phase change material 16 may be filled into the second recess 22 and cooled and solidified to be fixed, the molten first phase change material 15 may be filled into the third recess 23 and cooled and solidified to be fixed, and finally the molten third phase change material 17 may be filled into the first recess 21 and cooled and solidified to be fixed, and the third phase change material 17 may be cooled and solidified to block the through-flow gap 14.
Alternatively, the molten second phase change material 16 is first filled into the second groove 22 and the bottom of the third groove 23 and allowed to cool and solidify to fix, then the molten first phase change material 15 is filled into the top of the third groove 23 and allowed to cool and solidify to fix, and finally the molten third phase change material 17 is filled into the first groove 21 and allowed to cool and solidify to fix, and at the same time the third phase change material 17 is allowed to cool and solidify to block the through-flow gaps 14.
Therefore, after the first phase change material 15, the second phase change material 16, and the third phase change material 17 are filled in two ways, and the base plate and the cover plate 3 are assembled in a covering manner, the through-flow gap 14 is closed by the third phase change material 17, and the initial state of the fluid passage is closed.
When it is desired to open the reusable phase change valve, the third phase change material 17 is first heated to a temperature range of its melting point, causing the third phase change material 17 to melt. Fluid is then introduced into the fluid passage, along which it flows through the flow-through gap 14. At this time, the fluid may wash away the third phase change material 17 in a partially or completely molten state by the external force of the fluid due to the flow, and further penetrate through the through-flow gap 14, so that the fluid passage is opened.
When the reusable phase change valve needs to be closed, the fluid is stopped from being introduced into the fluid channel, and the first phase change material 15 is continuously heated to the temperature range of the melting point of the first phase change material, so that the first phase change material 15 is melted. At this time, the first phase change material 15 and the third phase change material 17 remaining when the previous phase change valve was opened are simultaneously melted, and the volumes of the melted first phase change material and the melted third phase change material are expanded to exceed the sum of the volumes of the first groove 21 and the through-flow gap 14. Therefore, the first phase change material 15 and the third phase change material 17 remaining when the phase change valve was opened last time fill the first recess 21 and the through-flow gap 14 by capillary action, and when the two are cooled and solidified, the through-flow gap 14 can be blocked, so that the fluid passage is closed. In addition, the heating state may be maintained to be continuously heated during a period from the previous time when the phase change valve is opened to the current time when the phase change valve is closed, or the heating may be stopped, and the flow of the fluid is not affected during the period.
When it is desired to open the reusable phase change valve a second time, the first phase change material 15 is heated to a temperature range of its melting point, causing the first phase change material 15 to melt. Fluid is then introduced into the fluid passage, along which it flows through the flow-through gap 14. At this time, the first phase change material 15 in a partially or completely molten state can be flushed away by the external force of the fluid due to the flow, and then the fluid passes through the through-flow gap 14, so that the fluid passage is opened.
When it is desired to close the reusable phase change valve a second time, the introduction of fluid into the fluid passageway is stopped and the second phase change material 16 is heated to a temperature range of its melting point to melt the second phase change material 16. At this time, the second phase change material 16 and the first phase change material 15 remaining when the phase change valve was opened at the previous time are melted at the same time, and the volumes of the two melted materials expand to exceed the sum of the volumes of the first groove 21, the second groove 22, and the through-flow gap 14. Therefore, the second phase change material 16 and the first phase change material 15 remaining when the phase change valve was opened last time fill the first groove 21, the second groove 22 and the through-flow gap 14 by capillary action, and when the two materials are cooled and solidified, the through-flow gap 14 can be blocked, so that the fluid passage is closed.
When it is desired to open the reusable phase change valve three times, the second phase change material 16 is melted by heating the second phase change material 16 to a temperature in the range of its melting point, similar to the method described above. Fluid is then introduced into the fluid passage, along which it flows through the flow-through gap 14. At this time, the second phase change material 16 in a partially or completely molten state can be flushed away by the external force of the fluid due to the flow, and then the fluid passes through the through-flow gap 14, so that the fluid passage is opened. In summary, three openings and three closings of the same fluid channel can be operated.
As shown in fig. 13 or 14, the cover plate 3 is provided with at least one pouring port 31 communicating with the fluid passage. The melted phase change material can be introduced or injected into the groove through the injection port 31, and a tool such as a pipette or a pipette can be used for the introduction or injection. Therefore, the melted phase change material can also be introduced into the fluid channel after the substrate and the cover plate 3 are assembled in a bonded state with respect to each other, increasing the flexibility of use.
Wherein the phase change valve further comprises: a seal (not shown) removably sealed to the pouring opening 31. Thus, the pouring opening 31 can be closed by the sealing member after the melted phase change material is introduced into the fluid passage, thereby putting the phase change valve into use. For example, the sealing member may be a PET sealing film, and the filling opening 31 of the cover plate 3 is sealed by the PET sealing film after the phase change material is filled.
Further, the phase change valve further includes: a heating device (not shown) which is connected in a thermally conductive manner to the base plate and/or the cover plate 3. The heating device for heating the corresponding phase change material may be, for example, a laser, a halogen lamp, a hot plate, a hot air gun, etc., or the heating device may be directly integrated on the substrate, such as a resistance heater, etc. The number of the heating devices used may be one or more, and may be determined according to the number of the phase change valves used, the manufacturing cost, and other factors.
The invention also provides a control method of the phase change valve, which comprises the following steps based on the phase change valve:
when the through-flow gap 14 is in a blocking state, heating and melting the phase change material blocking the through-flow gap 14 to penetrate through the through-flow gap 14 and keep other phase change materials in the groove in a solidification state; when the through-flow gap 14 is in a through state, the phase change material with the lowest melting point in the groove is heated, expanded and cooled to solidify so as to block the through-flow gap 14. For a specific control method, reference may be made to the description of the substrate, and details are not repeated herein.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (16)
1. A substrate, comprising:
the substrate comprises a substrate body, wherein at least one through groove is formed in the substrate body;
at least one bluff body is arranged in the through groove, and the flow cross section area of the through groove is larger than the flow cross section area of any bluff body; the flow blocking body is provided with at least one first groove, and the first groove is internally provided with at least one second groove.
2. The substrate according to claim 1, wherein a maximum flow-blocking cross-sectional width of the flow-blocking body is equal to a maximum flow-through cross-sectional width of the through-slot, and the maximum flow-blocking cross-sectional height of the flow-blocking body is less than the maximum flow-through cross-sectional height of the through-slot; the first groove is formed in the top end face of the flow blocking body.
3. The substrate of claim 2, wherein at least one sidewall of the first recess is a sidewall of the through slot.
4. The substrate according to claim 3, wherein two opposite side walls of the first groove in the width direction of the through-groove are two side walls of the through-groove.
5. The substrate according to any one of claims 1 to 4, wherein the substrate body is provided with at least one third groove;
the third groove is communicated with the first groove; or the third groove is communicated with the first groove and the second groove.
6. A phase change valve comprising a substrate according to any one of claims 1 to 4; the cover plate is oppositely covered with the base plate; the inner surface of the cover plate and the through groove form a fluid channel, and a through-flow gap is formed between the fluid blocking body and the fluid channel.
7. The phase change valve according to claim 6, wherein the first groove is filled with a first phase change material, the second groove is filled with a second phase change material, and the through-flow gap is in a through state;
the melting point of the first phase change material is lower than the melting point of the second phase change material.
8. The phase change valve according to claim 6, wherein the first groove and the through-flow gap are filled with a first phase change material, the second groove is filled with a second phase change material, and the through-flow gap is in a blocked state;
the melting point of the first phase change material is lower than the melting point of the second phase change material.
9. The phase change valve according to claim 6, wherein the first groove is filled with a first phase change material, the second groove is filled with a second phase change material, the through-flow gap is filled with a third phase change material, and the through-flow gap is in a blocked state;
the melting point of the third phase change material is lower than the melting point of the first phase change material, and the melting point of the first phase change material is lower than the melting point of the second phase change material.
10. A phase change valve comprising the substrate of claim 5; the cover plate is oppositely covered with the base plate; the inner surface of the cover plate and the through groove form a fluid channel, and a through-flow gap is formed between the fluid blocking body and the fluid channel.
11. The phase change valve according to claim 10, wherein the third groove is filled with a first phase change material, the second groove is filled with a second phase change material, and the through-flow gap is in a through state;
the melting point of the first phase change material is lower than the melting point of the second phase change material.
12. The phase change valve according to claim 10, wherein the third groove is filled with a first phase change material, the second groove is filled with a second phase change material, the first groove and the through-flow gap are filled with a third phase change material, and the through-flow gap is in a blocked state;
the melting point of the third phase change material is lower than the melting point of the first phase change material, and the melting point of the first phase change material is lower than the melting point of the second phase change material.
13. The phase change valve as claimed in any one of claims 6 to 12, wherein the cover plate is provided with at least one filling port in communication with the fluid passage.
14. The phase change valve as claimed in claim 13, further comprising:
a seal removably sealed to the pour spout.
15. The phase change valve according to any one of claims 6 to 12, further comprising:
a heating device in thermally conductive connection with the base plate and/or the cover plate.
16. A control method of a phase change valve according to any one of claims 7 to 9, 11, and 12, characterized by comprising the steps of:
when the through-flow gap is in a blocking state, heating and melting the phase change material blocking the through-flow gap so as to penetrate through the through-flow gap and keep other phase change materials in the groove in a solidification state;
and when the through-flow gap is in a through state, the phase change material with the lowest current melting point in the groove is cooled and solidified after being heated and expanded so as to plug the through-flow gap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911143244.4A CN110886901B (en) | 2019-11-20 | 2019-11-20 | Substrate, phase change valve and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911143244.4A CN110886901B (en) | 2019-11-20 | 2019-11-20 | Substrate, phase change valve and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110886901A CN110886901A (en) | 2020-03-17 |
| CN110886901B true CN110886901B (en) | 2021-06-08 |
Family
ID=69748110
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911143244.4A Active CN110886901B (en) | 2019-11-20 | 2019-11-20 | Substrate, phase change valve and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110886901B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111544804A (en) * | 2020-02-28 | 2020-08-18 | 青岛能蜂电气有限公司 | Automatic fire extinguishing device |
| CN111544805A (en) * | 2020-02-28 | 2020-08-18 | 青岛能蜂电气有限公司 | Automatic fire extinguishing device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101117617A (en) * | 2006-08-04 | 2008-02-06 | 三星电子株式会社 | Closing valve unit and reaction apparatus having closing valve |
| CN102597786A (en) * | 2009-11-03 | 2012-07-18 | 三星电子株式会社 | Valve unit, microfluidic device having the same, and method of driving the valve unit |
| CN104896191A (en) * | 2015-05-08 | 2015-09-09 | 沈阳航空航天大学 | Paraffin valve capable of being repeatedly used |
| CN105521840A (en) * | 2015-12-07 | 2016-04-27 | 中国科学院苏州生物医学工程技术研究所 | Micro-fluidic chip and preparation method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7980272B2 (en) * | 2007-06-21 | 2011-07-19 | Samsung Electronics Co., Ltd. | Microfluidic valve, method of manufacturing the same, and microfluidic device comprising the microfluidic valve |
-
2019
- 2019-11-20 CN CN201911143244.4A patent/CN110886901B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101117617A (en) * | 2006-08-04 | 2008-02-06 | 三星电子株式会社 | Closing valve unit and reaction apparatus having closing valve |
| CN102597786A (en) * | 2009-11-03 | 2012-07-18 | 三星电子株式会社 | Valve unit, microfluidic device having the same, and method of driving the valve unit |
| CN104896191A (en) * | 2015-05-08 | 2015-09-09 | 沈阳航空航天大学 | Paraffin valve capable of being repeatedly used |
| CN105521840A (en) * | 2015-12-07 | 2016-04-27 | 中国科学院苏州生物医学工程技术研究所 | Micro-fluidic chip and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110886901A (en) | 2020-03-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110886901B (en) | Substrate, phase change valve and control method thereof | |
| KR101578149B1 (en) | Microfluidic valve unit for controlling fluid flow and method for fabricating the same | |
| EP2030686B1 (en) | Microfluidic Device and Microfluidic System with the Same | |
| US8240336B2 (en) | Phase-change valve apparatuses | |
| US20020096222A1 (en) | Flow rate-controlling method and microvalve therefor | |
| US7159618B2 (en) | Electrically opened micro fluid valve | |
| EP1379787B1 (en) | Porous microfluidic valves | |
| AU2009262555B2 (en) | Microfluidic foil structure for metering of fluids | |
| EP2006588A2 (en) | Microfluidic valve, method of manufacturing the same, and microfluidic device comprising the microfluidic valve | |
| US8167217B2 (en) | Rapid-response thermostatic element as well as a cartridge and valve that are equipped with this element | |
| US9664304B2 (en) | Normally closed valve for microfluidic components of a polymeric layer system and method | |
| KR101274113B1 (en) | Magnetic microvalve using metal ball and manufacturing method thereof | |
| KR20080073934A (en) | Valve filler and valve unit with the same | |
| US20040195728A1 (en) | System and method for injection molded micro-replication of micro-fluidic substrates | |
| KR101199980B1 (en) | Method of producing Magneto Rheology Elastomer and micro apparatus of controlling fluid using the Magneto Rheology Elastomer | |
| US9186638B2 (en) | Microfluidic structure | |
| CN105465480B (en) | A kind of phase transformation valve gear and preparation method thereof | |
| CN109780318B (en) | Liquid metal micro-valve device and micro-fluidic system provided with same | |
| CN103706413B (en) | Microfluidic phase change type bubble micro-pump valve and method thereof | |
| KR101391736B1 (en) | Microfluidic valve, manufacturing process of the microfluidic valve and microfluidic device comprising the microfluidic valve | |
| CN116966940A (en) | Microfluidic chip and detection device | |
| KR101473871B1 (en) | Fabricating method of valve unit for controlling microfluid, valve unit for controlling microfluid, and microfluidic device with the valve unit | |
| EP3348886B1 (en) | Microfluidics valve | |
| EP3544790B1 (en) | Ultrasonic welding of a microfluidic device | |
| KR101399511B1 (en) | Apparatus for controlling fluid using micro fluid chip |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |