CN110947579A - Piezoelectric injection valve - Google Patents
Piezoelectric injection valve Download PDFInfo
- Publication number
- CN110947579A CN110947579A CN201911139374.0A CN201911139374A CN110947579A CN 110947579 A CN110947579 A CN 110947579A CN 201911139374 A CN201911139374 A CN 201911139374A CN 110947579 A CN110947579 A CN 110947579A
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- piezoelectric
- rod
- firing pin
- valve body
- injection valve
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
- B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
- B05C5/0225—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work characterised by flow controlling means, e.g. valves, located proximate the outlet
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- Fuel-Injection Apparatus (AREA)
Abstract
The invention discloses a piezoelectric injection valve which comprises a valve body, a first piezoelectric part, a second piezoelectric part, a pressure rod, a firing pin and a return spring, wherein the pressure rod can rotate based on a first rotating shaft, the first piezoelectric rod and the second piezoelectric rod are respectively arranged on two sides of the first rotating shaft and abutted against the pressure rod, one end of the firing pin penetrates out of the valve body, one end of the pressure rod, close to the first piezoelectric rod, is abutted against the other end of the firing pin, and the return spring is sleeved on the firing pin and abutted against the end face of the firing pin. According to the piezoelectric injection valve, the first piezoelectric rod and the second piezoelectric rod are alternately electrified, so that the firing pin moves downwards under the action of pressure applied to the first piezoelectric rod when the first piezoelectric rod is electrified, the second piezoelectric rod presses the compression rod when the second piezoelectric rod is electrified, the right end of the compression rod moves upwards, the return spring does not need to overcome pressure resilience of the compression rod, the second piezoelectric rod assists the return spring to return the firing pin, and the defect that the firing pin cannot be accurately returned is overcome.
Description
Technical Field
The invention relates to the technical field of piezoelectric injection valves and dispensing, in particular to a piezoelectric injection valve.
Background
The piezoelectric injection valve utilizes the characteristics of piezoelectric materials, generates mechanical force through voltage, realizes the opening and closing of the valve, can eject a trace amount of liquid materials at a high speed due to extremely small space of the switch valve and extremely high piezoelectric action frequency, and is widely applied to the dispensing field with high precision and high reliability.
Traditional piezoelectricity injection valve generally needs mechanical spring to reset, and reset spring uses for a long time and can appear tiredly, causes injection valve's the not in place or not accurate that resets, and the glue volume that injection valve jetted is unstable, influences injection valve's some precision of gluing.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a piezoelectric injection valve which can overcome the defect that the piezoelectric injection valve is not accurately reset.
An embodiment of the present invention provides a piezoelectric injection valve including:
the valve body is internally provided with a first rotating shaft;
a first piezoelectric portion comprising a first piezoelectric rod;
a second piezoelectric portion comprising a second piezoelectric rod;
the first piezoelectric rod and the second piezoelectric rod are respectively arranged on two sides of the first rotating shaft and are abutted against the pressing rod;
one end of the firing pin penetrates out of the valve body, and one end of the compression rod close to the first piezoelectric rod abuts against the other end of the firing pin;
and the return spring is sleeved on the firing pin and abuts against the end surface of the firing pin.
The piezoelectric injection valve in the embodiment of the invention has at least the following beneficial effects:
according to the piezoelectric injection valve, the first piezoelectric rod and the second piezoelectric rod are alternately electrified, so that the firing pin moves downwards under the action of pressure applied to the first piezoelectric rod when the first piezoelectric rod is electrified, the second piezoelectric rod presses the compression rod when the second piezoelectric rod is electrified, the right end of the compression rod moves upwards, the return spring does not need to overcome pressure resilience of the compression rod, the second piezoelectric rod assists the return spring to return the firing pin, and the defect that the firing pin cannot be accurately returned is overcome.
According to further embodiments of the present invention, the first piezoelectric portion further includes a first adjustment rod and a first connection rod, one end of the first adjustment rod extends into the valve body and abuts against the first connection rod, and a bottom of the first connection rod contacts the first piezoelectric rod.
According to another embodiment of the present invention, a second rotating shaft is disposed in the valve body, and the first connecting rod can be driven by the first adjusting rod to rotate based on the second rotating shaft and drive the first piezoelectric rod to move.
According to another embodiment of the present invention, the second piezoelectric portion further includes a second adjustment rod and a second connection rod, one end of the second adjustment rod extends into the valve body and abuts against the second connection rod, and a bottom of the second connection rod contacts the second piezoelectric rod.
According to the piezoelectric injection valve of other embodiments of the present invention, a third rotating shaft is disposed in the valve body, and the second connecting rod can be driven by the second adjusting rod to rotate based on the third rotating shaft and drive the second piezoelectric rod to move.
According to still other embodiments of the present invention, the first piezoelectric rod and the second piezoelectric rod are symmetrical with respect to a center of the first rotary shaft.
According to another embodiment of the present invention, the piezoelectric injection valve further includes an installation plug, the installation plug is fixedly installed at the bottom of the valve body, the striker protrudes from the installation plug, and two ends of the return spring respectively abut against the top of the striker and the top of the installation plug.
According to other embodiments of the invention, the piezoelectric injection valve further comprises a valve seat detachably connected to the bottom of the valve body, a liquid storage cavity is arranged inside the valve seat, a nozzle is arranged at the bottom of the valve seat, the nozzle is provided with an inner cavity, the inner cavity is communicated with the liquid storage cavity, and the striker can enter and exit the inner cavity from the inner cavity.
According to the piezoelectric injection valve of other embodiments of the present invention, the valve seat is further provided with a liquid inlet, and the liquid inlet is communicated with the liquid storage cavity.
According to other embodiments of the piezoelectric injection valve, the valve seat is further provided with a cleaning port, and the cleaning port is communicated with the liquid storage cavity.
Drawings
FIG. 1 is a schematic perspective view of one embodiment of a piezoelectric injection valve;
FIG. 2 is a cross-sectional schematic view of one embodiment of a piezo jet valve;
fig. 3 is an enlarged schematic view of a portion a in fig. 2.
Detailed Description
The concept and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments to fully understand the objects, features and effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention.
In the description of the embodiments of the present invention, if an orientation description is referred to, for example, the orientations or positional relationships indicated by "upper", "lower", "front", "rear", "left", "right", etc. are based on the orientations or positional relationships shown in the drawings, only for convenience of describing the present invention and simplifying the description, but not for indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the embodiments of the present invention, if a feature is referred to as being "disposed", "fixed", "connected", or "mounted" to another feature, it may be directly disposed, fixed, or connected to the other feature or may be indirectly disposed, fixed, connected, or mounted to the other feature. In the description of the embodiments of the present invention, if "a number" is referred to, it means one or more, if "a plurality" is referred to, it means two or more, if "greater than", "less than" or "more than" is referred to, it is understood that the number is not included, and if "greater than", "lower" or "inner" is referred to, it is understood that the number is included. If reference is made to "first" or "second", this should be understood to distinguish between features and not to indicate or imply relative importance or to implicitly indicate the number of indicated features or to implicitly indicate the precedence of the indicated features.
Fig. 1 is a perspective view of an embodiment of a piezo injector, fig. 2 is a sectional view of the embodiment of the piezo injector, fig. 3 is a method view of a portion a in fig. 2, and referring to fig. 1 to 3, the piezo injector in the embodiment includes a valve body 100, a first piezo portion 200, a second piezo portion 300, a plunger 410, and a striker 420. Specifically, a first rotating shaft 110 is arranged inside the valve body 100, and the first rotating shaft 110 is used for being rotatably connected with other parts; the first piezoelectric portion 200 includes a first piezoelectric rod 210, the second piezoelectric portion 300 includes a second piezoelectric rod 310, and both the first piezoelectric rod 210 and the second piezoelectric rod 310 are expandable and extendable in an energized state; the bottom of the pressing rod 410 contacts the first rotating shaft 110 and can rotate based on the first rotating shaft 110, the first piezoelectric rod 210 and the second piezoelectric rod 310 are respectively arranged at two sides of the first rotating shaft 110, and the end of the first piezoelectric rod 210 and the end of the second piezoelectric rod 310 are abutted against the top of the pressing rod 410, so that the pressing rod 410 can be pressed to rotate based on the first rotating shaft 110 when the first piezoelectric rod 210 or the second piezoelectric rod 310 is electrically elongated; the striker 420 is disposed at the bottom of the valve body 100, one end of the striker 420 is located inside the valve body 100, the other end of the striker 420 extends from the bottom of the valve body 100, one end of the pressing rod 410 close to the first piezoelectric rod 210 abuts against the top of the striker 420, and the pressing rod 410 can press the striker 420 downward when rotating based on the first rotating shaft 110, so that the striker 420 moves; the return spring 430 is sleeved on the striker 420, the return spring 430 abuts against the end surface of the striker 420, when the striker 420 moves downward under the pressing of the compression rod 410, the return spring 430 is compressed by the pressure of the striker 420, and when the pressing force of the compression rod 410 on the striker 420 is removed, the return spring 430 rebounds to drive the striker 420 to return.
The piezoelectric injection valve in this embodiment is provided with a first piezoelectric portion 200 and a second piezoelectric portion 300, both the first piezoelectric rod 210 and the second piezoelectric rod 310 can expand and extend when energized, when the first piezoelectric rod 210 is energized and the second piezoelectric rod 310 is not energized, the first piezoelectric rod 210 extends and pushes the pressing rod 410 downward, the pressing rod 410 rotates clockwise based on the first rotating shaft 110, the right end of the pressing rod 410 presses the striker 420 downward to move the striker 420 downward, and the return spring 430 is compressed; when the first piezoelectric rod 210 is powered off and the second piezoelectric rod 310 is powered on, the first piezoelectric rod 210 contracts, the pressure of the first piezoelectric rod 210 on the pressing rod 410 disappears, the second piezoelectric rod 310 extends and pushes the pressing rod 410 downwards, the pressing rod 410 rotates anticlockwise based on the first rotating shaft 110, the right end of the pressing rod 410 moves upwards, the pressing rod 410 does not apply pressure on the striker 420 any more, the pressing force of the striker 420 on the return spring 430 disappears, and the return spring 430 rebounds to push the striker 420 upwards, so that the striker 420 moves upwards and returns.
In the piezoelectric injection valve of the present embodiment, the first piezoelectric rod 210 and the second piezoelectric rod 310 are alternately energized, so that the striker 420 moves downward under the action of the pressure applied to the first piezoelectric rod 210 when the first piezoelectric rod 210 is energized, and when the second piezoelectric rod 310 is energized, the second piezoelectric rod 310 presses the plunger 410 to move the right end of the plunger 410 upward, the return spring 430 does not have to overcome the pressure resilience of the plunger 410, and the second piezoelectric rod 310 assists the return spring 430 to return the striker 420, thereby overcoming the defect that the return of the striker 420 is not accurate.
It is conceivable that the first piezoelectric rod 210 and the second piezoelectric rod 310 are symmetrical with respect to the center of the first rotating shaft 110, so that under the condition that the applied voltages are the same, the deformation amounts of the first piezoelectric rod 210 and the second piezoelectric rod 310 are the same, and the displacement amounts generated by the first piezoelectric rod 210 and the second piezoelectric rod 310 driving the striker 420 are the same, so as to ensure the consistency of the displacement changes of the striker 420 when the first piezoelectric rod 210 and the second piezoelectric rod 310 alternately act, and improve the stability of the operation of the piezoelectric injection valve.
The first piezoelectric portion 200 further includes a first adjustment rod 220 and a first connection rod 230, the first connection rod 230 is located in the valve body 100, one end of the first adjustment rod 220 is exposed from the surface of the valve body 100, the other end of the first adjustment rod 220 extends into the valve body 100 and abuts against the first connection rod 230, and the bottom of the first connection rod 230 contacts the first piezoelectric rod 210; the second rotating shaft 240 is arranged in the valve body 100, the first connecting rod 230 can drive the first piezoelectric rod 210 to move under the driving of the first adjusting rod 220, and the position of the striker 420 is adjusted in the downward movement process of the first piezoelectric rod 210 through the adjusting effect of the first adjusting rod 220 on the first piezoelectric rod 210, so that the striker 420 can perform subsequent actions at a proper initial position, and the working stability of the striker 420 is improved. Specifically, the movement of the first adjustment lever 220 may be achieved by using an external tool, when the first adjustment lever 220 moves downward, the right end of the first connection lever 230 is pressed downward, the first connection lever 230 rotates clockwise based on the second rotating shaft 240, and because the first piezoelectric lever 210 is located on the right side of the second rotating shaft 240, when the first connection lever 230 rotates, the first piezoelectric lever 210 is pressed downward to move the first piezoelectric lever 210 downward, the first piezoelectric lever 210 further pushes the pressing rod 410 downward, and the right end of the pressing rod 410 presses the firing pin 420 downward to move the firing pin 420 downward, thereby adjusting the position of the firing pin 420.
Similarly, the second piezoelectric portion 300 further includes a second adjustment rod 320 and a second connection rod 330, the second connection rod 330 is located in the valve body 100, one end of the second adjustment rod 320 is exposed from the surface of the valve body 100, the other end of the second adjustment rod 320 extends into the valve body 100 and abuts against the second connection rod 330, and the bottom of the second connection rod 330 contacts the second piezoelectric rod 310; the third rotating shaft 340 is arranged inside the valve body 100, the second connecting rod 330 can drive the second piezoelectric rod 310 to move under the driving of the second adjusting rod 320, and the position of the striker 420 is adjusted by the second adjusting rod 320 to adjust the second piezoelectric rod 310 in the downward movement process, so that the striker 420 can perform subsequent actions at a proper initial position, and the working stability of the striker 420 is improved. Specifically, the movement of the second adjustment lever 320 may be achieved by contacting an external tool, when the second adjustment lever 320 moves downward, the left end of the second connection rod 330 is pressed downward, the second connection rod 330 rotates counterclockwise based on the third rotation shaft 340, because the second piezoelectric rod 310 is located on the left side of the third rotation shaft 340, when the second connection rod 330 rotates, the second piezoelectric rod 310 is pressed downward, so that the second piezoelectric rod 310 moves downward, the second piezoelectric rod 310 further pushes the pressing rod 410 downward, the right end of the pressing rod 410 moves upward, and no longer presses the striker 420, and the striker 420 moves upward under the elastic force of the return spring 430, thereby achieving the adjustment of the position of the striker 420.
The position of the striker 420 is compensated by adjusting the positions of the first adjusting rod 220 and the second adjusting rod 320, so that the defect of unstable position change of the striker 420 caused by unstable voltage and unstable deformation of the first piezoelectric rod 210 or the second piezoelectric rod 310 is overcome, the failure rate of the piezoelectric injection valve is reduced, and the working stability of the piezoelectric injection valve is improved.
The bottom of the valve body 100 is further provided with an installation plug 440, the installation plug 440 is fixedly installed on the valve body 100, the firing pin 420 penetrates through the installation plug 440 and extends out of the valve body 100, the return spring 430 is sleeved on the firing pin 420, and two ends of the return spring 430 respectively support against the top of the firing pin 420 and the top of the installation plug 440. When the firing pin 420 moves downwards, the return spring 430 is pressed downwards, and the return spring 430 is compressed under the pressing action of the mounting plug 440 and the firing pin 420; when the striker 420 is not pressed by the pressing force of the lever 410, the return spring 430 is rebounded and the striker 420 moves upward.
The piezoelectric injection valve further comprises a valve seat 500, the valve seat 500 is detachably mounted at the bottom of the valve body 100, a nozzle 510 is arranged at the bottom of the valve seat 500, an inner cavity 511 is arranged in the nozzle 510, a liquid storage cavity 520 is arranged inside the valve seat 500, the liquid storage cavity 520 is communicated with the inner cavity 511, liquid in the liquid storage cavity 520 can enter the inner cavity 511, the striker 420 can enter the nozzle 510 and exit under the pressing action of the pressure lever 410, and when the striker 420 moves downwards, the striker enters the inner cavity 511 to eject the liquid in the inner cavity 511 out of the nozzle 510. The excitation voltage of the first piezoelectric rod 210 and the second piezoelectric rod 310 is square wave, so that the striker 420 can reciprocate at high speed under the pressing action of the first piezoelectric rod 210, and at the same time, the liquid is ejected from the nozzle 510; it should be noted that the width of the square wave can be adjusted to meet the requirement of the ejection speed of the liquid.
The valve seat 500 is further provided with a liquid inlet 530, the liquid inlet 530 is communicated with the liquid storage cavity 520, and liquid can be injected into the liquid storage cavity 520 through the liquid inlet 530. Still be equipped with on the disk seat 500 and wash mouthful 540, wash mouthful 540 and stock solution chamber 520 intercommunication, wash mouthful 540 department and install end cap 550 and plug up with washing mouthful 540, when needs wash, dismantle end cap 550, wash stock solution chamber 520 and nozzle 510 with the cleaner.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. Furthermore, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
Claims (10)
1. A piezoelectric injection valve, comprising:
the valve body is internally provided with a first rotating shaft;
a first piezoelectric portion comprising a first piezoelectric rod;
a second piezoelectric portion comprising a second piezoelectric rod;
the first piezoelectric rod and the second piezoelectric rod are respectively arranged on two sides of the first rotating shaft and are abutted against the pressing rod;
one end of the firing pin penetrates out of the valve body, and one end of the compression rod close to the first piezoelectric rod abuts against the other end of the firing pin;
and the return spring is sleeved on the firing pin and abuts against the end surface of the firing pin.
2. The piezoelectric injection valve of claim 1 wherein the first piezoelectric portion further comprises a first adjustment stem and a first connecting stem, one end of the first adjustment stem extending into the valve body and abutting the first connecting stem, a bottom of the first connecting stem contacting the first piezoelectric stem.
3. The piezoelectric injection valve as claimed in claim 2, wherein a second rotating shaft is provided in the valve body, and the first connecting rod is capable of rotating based on the second rotating shaft under the driving of the first adjusting rod and driving the first piezoelectric rod to move.
4. The piezoelectric injection valve according to claim 1, wherein the second piezoelectric portion further includes a second adjustment rod and a second connection rod, one end of the second adjustment rod extends into the valve body and abuts against the second connection rod, and a bottom portion of the second connection rod contacts the second piezoelectric rod.
5. The piezoelectric injection valve according to claim 4, wherein a third rotating shaft is disposed in the valve body, and the second connecting rod is capable of rotating based on the third rotating shaft under the driving of the second adjusting rod and driving the second piezoelectric rod to move.
6. The piezoelectric injection valve according to any one of claims 1 to 5, wherein the first piezoelectric rod and the second piezoelectric rod are symmetrical with respect to a center of the first rotation shaft.
7. The piezoelectric injection valve according to any one of claims 1 to 5, further comprising a mounting plug fixedly mounted to a bottom of the valve body, wherein the striker protrudes from the mounting plug, and wherein both ends of the return spring respectively abut against a top of the striker and a top of the mounting plug.
8. The piezoelectric injection valve according to any one of claims 1 to 5, further comprising a valve seat detachably attached to a bottom of the valve body, wherein a reservoir is provided inside the valve seat, a nozzle is provided at a bottom of the valve seat, the nozzle has an inner cavity, the inner cavity is communicated with the reservoir, and the striker can enter and exit the inner cavity.
9. The piezoelectric injector valve according to claim 8, wherein the valve seat further has a liquid inlet, and the liquid inlet is communicated with the liquid storage cavity.
10. The piezoelectric injector valve according to claim 8, wherein a purge port is further provided in the valve seat, the purge port communicating with the reservoir chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911139374.0A CN110947579A (en) | 2019-11-20 | 2019-11-20 | Piezoelectric injection valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911139374.0A CN110947579A (en) | 2019-11-20 | 2019-11-20 | Piezoelectric injection valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110947579A true CN110947579A (en) | 2020-04-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911139374.0A Pending CN110947579A (en) | 2019-11-20 | 2019-11-20 | Piezoelectric injection valve |
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| Country | Link |
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| CN (1) | CN110947579A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111632796A (en) * | 2020-06-10 | 2020-09-08 | 东莞市集韵自动化科技有限公司 | Impact-free piezoelectric injection dispensing valve |
| WO2022167289A1 (en) * | 2021-02-04 | 2022-08-11 | Vermes Microdispensing GmbH | Metering system |
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| CN105499072A (en) * | 2016-01-20 | 2016-04-20 | 中南大学 | Piezoelectric ceramic drive dispensing valve |
| KR101614312B1 (en) * | 2014-11-18 | 2016-04-22 | 주식회사 프로텍 | Piezoelectric Dispenser and Method for Compensating Stroke of the Same |
| CN106111430A (en) * | 2016-08-25 | 2016-11-16 | 深圳市锐德精密科技有限公司 | Piezoelectric type injection valve |
| CN207667940U (en) * | 2017-12-19 | 2018-07-31 | 深圳长城开发科技股份有限公司 | A kind of point glue equipment based on double piezoelectric ceramic driving |
| CN109433505A (en) * | 2018-11-26 | 2019-03-08 | 深圳市锐德精密科技有限公司 | A kind of fluid injection valve |
-
2019
- 2019-11-20 CN CN201911139374.0A patent/CN110947579A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2016510374A (en) * | 2013-08-14 | 2016-04-07 | プロテック カンパニー リミテッドＰｒｏｔｅｃ Ｃｏ．， Ｌｔｄ． | Life calculation type piezoelectric dispenser |
| KR101614312B1 (en) * | 2014-11-18 | 2016-04-22 | 주식회사 프로텍 | Piezoelectric Dispenser and Method for Compensating Stroke of the Same |
| CN105499072A (en) * | 2016-01-20 | 2016-04-20 | 中南大学 | Piezoelectric ceramic drive dispensing valve |
| CN106111430A (en) * | 2016-08-25 | 2016-11-16 | 深圳市锐德精密科技有限公司 | Piezoelectric type injection valve |
| CN207667940U (en) * | 2017-12-19 | 2018-07-31 | 深圳长城开发科技股份有限公司 | A kind of point glue equipment based on double piezoelectric ceramic driving |
| CN109433505A (en) * | 2018-11-26 | 2019-03-08 | 深圳市锐德精密科技有限公司 | A kind of fluid injection valve |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111632796A (en) * | 2020-06-10 | 2020-09-08 | 东莞市集韵自动化科技有限公司 | Impact-free piezoelectric injection dispensing valve |
| CN111632796B (en) * | 2020-06-10 | 2021-07-16 | 东莞市集韵自动化科技有限公司 | Impact-free piezoelectric injection dispensing valve |
| WO2022167289A1 (en) * | 2021-02-04 | 2022-08-11 | Vermes Microdispensing GmbH | Metering system |
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