CN117234249A - Gas mixing proportioning device using digital combination valve to control mixing proportioning - Google Patents
Gas mixing proportioning device using digital combination valve to control mixing proportioning Download PDFInfo
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- CN117234249A CN117234249A CN202311393367.XA CN202311393367A CN117234249A CN 117234249 A CN117234249 A CN 117234249A CN 202311393367 A CN202311393367 A CN 202311393367A CN 117234249 A CN117234249 A CN 117234249A
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- 238000002788 crimping Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 2
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- 238000005516 engineering process Methods 0.000 abstract description 5
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 24
- 229910052734 helium Inorganic materials 0.000 description 15
- 229910052757 nitrogen Inorganic materials 0.000 description 13
- 238000003698 laser cutting Methods 0.000 description 12
- 239000000203 mixture Substances 0.000 description 9
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- 238000006243 chemical reaction Methods 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
- 238000004021 metal welding Methods 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000009189 diving Effects 0.000 description 1
- 238000009920 food preservation Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
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- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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Abstract
The invention discloses a gas mixing proportioner for controlling mixing proportioner by utilizing a digital combination valve, which is characterized in that the gas mixing proportioner is controlled by utilizing the digital combination valve and consists of a plurality of paths of gas pressure balance units, various paths of gas flow control digital combination valves and a gas mixing unit, wherein a plurality of paths of gases are input from the pressure balance units, respectively flow into the various paths of gas flow control digital combination valves after pressure difference balance, and according to the gas mixing proportioner proportion, the flow cross section area of the digital combination valves is controlled by adopting the switching value to control the output flow of the various paths of gases, and finally flow into the gas mixing units for converging and mixing to output mixed gases; the invention is applied to the field of gas mixing proportion, solves the problem that the existing gas mixing proportion technology is difficult to change frequently, realizes the digital control of multi-path gas mixing proportion, is suitable for dynamically changing the proportion in real time, namely mixing and using, and has the advantages of simple control, high response speed, high repetition precision and the like.
Description
Technical Field
The invention relates to a method for controlling gas mixing ratio by utilizing a digital combination valve, belongs to the technical field of gas mixing ratio devices, and is used in various application fields using mixed gas, in particular to the application fields using the mixed gas as laser cutting auxiliary gas and laser welding protective gas.
Background
The use of CO in mixed gases, such as in metal welding, is used in many fields 2 Ar, he, a small amount of O 2 And a rare gas as a shielding gas by mixing two or more kinds of gases; CO for food preservation 2 、O 2 、N 2 Mixing two or more kinds of gases of Ar as fresh-keeping gas; glass processing uses gas, air and O 2 Mixing the gases;helium leakage detecting He and N 2 Mixing the gases; o for medical use and diving 2 And N 2 The gas mixture "synthetic air" and the like.
The existing gas mixing and proportioning technology is generally based on the volumetric flow proportioning principle of pressure balance, namely on the premise of ensuring that the input pressure is equal before each path of gas mixing and proportioning, the ratio of the volumetric flow of each path of gas is in direct proportion to the ratio of the opening (the flow cross section) of each path of gas control valve, and the gas mixing and proportioning device consists of a gas pressure balancing unit, a gas flow control unit and a gas mixing unit, wherein: the gas pressure balancing unit balances the pressure difference of each path of gas input, so that the gas pressure values input to each path of gas flow control unit are equal before mixing and proportioning; the gas flow control unit consists of flow control valves, controls the flow of each path of gas by adjusting the opening (namely the flow cross section) of the flow control valves, adjusts and controls the flow of each path of gas according to the gas mixing proportion, flows into the gas mixing unit, carries out uniform mixing and outputs mixed gas. According to the difference of the gas mixing units, the gas mixing units are divided into two types of static mixing and dynamic mixing: the storage tank is arranged to store the mixed gas, a fixed proportion is preset, the static mixing is realized, the gas mixing proportion can be changed only after the stored mixed gas is used, and the mixed gas cannot be mixed and used at once; the storage tank is not arranged, the gas mixing unit is a gas converging mixing area with a small space, and the gas converging mixing area belongs to dynamic mixing, namely mixing and using; the gas flow control unit used in the existing gas mixing proportion technology comprises a manual throttle valve and a gas flow control unit of a flowmeter, wherein the opening of the valve port is manually adjusted to control the gas flow, and the flowmeter indicates the gas flow to assist in adjustment; a gas flow control unit for controlling the gas flow by switching on and off the electromagnetic valve timing, wherein the storage tank stores the mixed gas, and belongs to static mixing; the gas flow control unit for adjusting the opening of the valve port by driving the valve core displacement by a motor has high proportioning precision and can control the gas mixing proportion by a digital control program, but a mechanical transmission mechanism such as a screw rod nut is used for converting rotary motion into linear displacement of the valve core, so that mechanical abrasion exists, and the gas flow control unit is not suitable for frequently changing the mixing proportion; the gas flow control unit of a gas Mass Flow Controller (MFC), the mass flow controller is made up of electronic Mass Flowmeter (MFM) and electromagnetic proportional valve, control the gas flow through the opening degree of the valve port of the electromagnetic proportional valve continuous adjustment, the electronic mass flowmeter measures the feedback to control the gas flow, the proportion precision is high, can control the gas mixing proportion through the digital control program, it is high in cost, uneconomical not enough.
Laser cutting uses an auxiliary gas to blow away the melt generated by melting the sheet material by the laser to form a cutting gap, usually using O 2 、N 2 Or compressed air as an auxiliary gas, desirably O 2 And N 2 The mixed gas is used as auxiliary gas, and different gas mixing ratios are used for laser perforation and cutting, and the gas mixing ratio can be dynamically controlled and changed in real time; because laser cutting is continuously and repeatedly subjected to perforation and cutting processes, the auxiliary gas mixing ratio is required to be frequently switched and changed through digital control, only a motor-driven valve core and a gas mixing ratio device with a mass flow controller for controlling gas flow rate have the capability of digitally controlling the gas mixing ratio in the prior art, but the motor-driven valve core is mechanically worn and is not suitable for frequently changing the gas mixing ratio, and the mass flow controller is high in cost and uneconomical, so that the development of a relatively economical digitally controlled gas mixing ratio device suitable for frequently changing the gas mixing ratio is expected, and the dynamic real-time digital control of the ratio and the instant mixing are realized.
Disclosure of Invention
The invention aims to provide a gas mixing proportioner which is controlled digitally and is easy to change the gas mixing proportion frequently, and the gas mixing proportioner can dynamically and digitally control the gas mixing proportion in real time and can be used as the gas mixing proportion and the gas mixing proportion in real time, and is applied to various fields using the mixed gas, in particular to the application field using the mixed gas as laser cutting auxiliary gas and laser welding protective gas; the adopted technical measure is that the digital combination valve is used as a flow control valve for controlling the gas mixing proportion.
The invention provides a gas mixing proportioner for controlling mixing proportion by utilizing a digital combination valve, which is characterized in that the digital combination valve is used as a flow control valve for controlling the gas mixing proportion, the gas mixing proportioner comprises a multi-path gas pressure balancing unit, various paths of gas flow control digital combination valves and a gas mixing unit, multi-path gas is input from the pressure balancing unit, after pressure difference balancing, the pressures of various paths of gas before mixing proportion are equal, then the multi-path gas respectively flows into the various paths of gas flow control digital combination valves, the flow cross section of the various paths of gas flow control digital combination valves is digitally controlled by adopting switching value according to the multi-path gas mixing proportion, the output flow of various paths of gas is respectively controlled, and finally, the multi-path gas enters the gas mixing unit and is converged and mixed, and then the mixed gas is output from an output interface of the gas mixing unit; the invention is applied to the field of gas mixing proportion, realizes digital control of multi-path gas mixing proportion, and is suitable for dynamically changing the proportion in real time, and the compound can be used immediately.
The multi-path gas pressure balancing unit consists of gas pressure balancing valves, and adopts the gas pressure (differential pressure) balancing valves of the prior art for disclosing gas mixing proportion technology; the gas mixing proportioner is based on the volumetric flow proportioning principle of pressure balance, namely the ratio of the volumetric flow of each path of gas is in direct proportion to the ratio of the flow cross sections of each path of gas throttling under the premise that the pressure of each path of gas is balanced (equal) before gas mixing proportioning.
Furthermore, the digital combination valve is characterized in that the digital combination valve is formed by connecting a plurality of branch throttle channels with discrete digital fixed throttle flow sectional areas in parallel, wherein the on-off control of the switch valve is realized, each branch throttle channel is formed by connecting a fixed throttle hole and a switch valve in series, and the throttle aperture size determines the throttle flow sectional area of the branch throttle channel; the on-off state of the switch valve controls the on-off state of the corresponding branch throttling channel, the on-off state combination of each switch valve is digitally controlled by adopting the on-off quantity, and the on-off state combination of the corresponding parallel branch throttling channel is formed into different flow cross sections of the digital combination valve; the flow cross section area of the digital combination valve is equal to the sum of the throttling flow cross sections of all the branch throttling channels in the opening state, and the flow cross section area of the digital combination valve is changed by controlling the combination of the opening state and the closing state of each branch throttling channel, so that the output discrete and digital approximate continuous gas flow is controlled.
Further, the digital combination valve is characterized in that a plurality of parallel branch throttling channels of the digital combination valve all have different discrete digital fixed throttling flow sectional areas, and the ratio of the throttling flow sectional areas of the parallel branch throttling channels is s 0 :s 1 :s 2 :s 3 :…s i :…s （n-1） =2 0 :2 1 :2 2 :2 3 :…2 i :…2 （n-1） ，2 i Is binary bit weight, i is 0, 1, 2, …, n-1, n is the number of parallel branch throttle channels and control switch valves thereof, called n-channel binary digital combination valve, the flow cross section S thereof d Equal to the sum of the throttle flow cross-sectional areas of all the branch throttle channels in the open state, i.e. S d ==s 0 Wherein: s is(s) 0 The minimum throttling flow cross section area in the parallel branch throttling channels is called a discrete digital graduation value or resolution of the flow cross section area of the digital combination valve, s 0 The smaller n is, the larger n is, the more the number of the switch valves is, and the more the number of the switch valves approaches to the continuous flow sectional area;the switching state value of the i branch throttling channel control switching valve is represented by 0 or 1, 0 is represented by the i branch throttling channel and the switching valve thereof in an off state, and 1 is represented by the i branch throttling channel and the switching valve thereof in an on state; with minimum cross-sectional area s of flow 0 Multiple number of (a) represents the flow cross section S of the digital combination valve d /s 0 =Each branch throttle passageThe values are different, and 0, 1, 2, 3, … and (2) are formed by digital combination n -1) 2 altogether n The number of the flow cross section is correspondingly formed into 0 s and 1s 0 、2s 0 、3s 0 、…、（2 n -1）s 0 2 of (2) n The level discrete digitization approximates a continuous cross-sectional flow area.
Further, the digital combination valve is characterized in that the plurality of parallel branch throttle channels of the digital combination valve all have the same discrete digital fixed throttle flow cross section, m is the number of the parallel branch throttle channels and the control switch valves thereof, and is called an m-channel incremental digital combination valve, and the flow cross section S thereof d Equal to the sum of the throttle flow cross-sectional areas of all the branch throttle channels in the open state, i.e. S d ==s 0 Wherein s is 0 For the throttle flow cross-sectional area of each branch throttle passage,the switch state value of the i branch throttle passage control switch valve is 0 or 1, 0 is 0 and the i branch throttle passage and the switch valve thereof are in the off state, 1 is the i branch throttle passage and the switch valve thereof are in the on state, and the flow cross section s of each branch throttle passage is used 0 Multiple number of (a) represents the flow cross section S of the digital combination valve d /s 0 =Each branch throttle passageThe values are different, and the groups are increased or decreased by the same amount of numbersCombining to form 0, 1, 2, 3, … and m total m+1 flow cross-sectional area numbers, correspondingly forming 0 and 1s 0 、2s 0 、3s 0 、…、ms 0 Is approximated by a continuous cross-sectional flow area of m+1 discrete digitization.
Furthermore, the digital combination valve is characterized in that a parallel branch throttling channel (called as a manual subdivision channel for short) for manually subdividing and adjusting the flow section can be added; the manual subdivision channel consists of a switch valve and a manual throttle valve which are connected in series, and the maximum throttle flow cross section of the manual throttle valve is equal to the minimum throttle flow cross section s of the digital combination valve branch throttle channel 0 The method comprises the steps of carrying out a first treatment on the surface of the The on-off state of the on-off valve controls the on-off state of the manual subdivision channel, the flow cross section of the manual throttle valve is manually adjusted, the throttle flow cross section of the manual subdivision channel is changed, and the approximation continuous control of the gas flow is realized by combining discrete digital control of the flow cross section of the digital combination valve; the flow cross section area of the digital combination valve is the discrete digital flow cross section area S of the digital combination valve d And manually subdividing the throttle flow cross-sectional area s of the channel m Sum s=s d +s m 。
Further, the digital combination valve is characterized by being the binary digital combination valve, the incremental digital combination valve or a parallel combination of the binary digital combination valve and the incremental digital combination valve.
Furthermore, the digital combined valve is characterized in that the related switch valve comprises a direct-acting electromagnetic valve, a step-by-step direct-acting (internal pilot) electromagnetic valve, a pilot electromagnetic valve, a miniature high-speed electromagnetic switch valve control pilot gas switch valve, a piezoelectric ceramic valve control pilot gas switch valve and an electromagnetic cartridge valve type; the installation types of the switch valve comprise plate connection type, pipe connection type and cartridge valve type.
Furthermore, the digital combination valve is characterized in that the digital combination valve can adopt a structural form of an air pipe connection switch valve, but preferably adopts an integrated compact structural form of a plate connection type, a clamping connection type or a cartridge valve type:
The board connection structure is as follows: consists of a valve body, a series of plate-connected switch valves and fixing screws; the valve body is internally provided with an air inlet split flow channel and a gas input interface thereof, a converging air outlet channel and a gas output interface thereof, a plurality of branch throttle channel air inlet holes, an air outlet throttle hole and a switch valve fixing screw hole which are arranged at intervals; the air inlet holes of all branch throttle channels are communicated with the air inlet split-flow channels, and the air outlet orifices of all branch throttle channels are communicated with the converging air outlet channels; the air inlet and the air outlet of the plate-connected switch valve are respectively butted with the air inlet and the air outlet orifice of the branch throttling channel on the valve body, and the plate-connected switch valve is fixed on the valve body by using screws; in the valve body, each of the branch throttle channel air inlet hole, the plate-connected switch valve air inlet hole, the air outlet hole and the branch throttle channel air outlet throttle hole which are arranged at intervals respectively form a branch throttle channel, and the branch throttle channels are connected in parallel through an air inlet split channel and a converging air outlet channel to form each parallel branch throttle channel of the digital combination valve;
the clamping structure comprises: the device consists of an air inlet and split-flow channel valve body and a gas input interface thereof, a converging and outlet channel valve body and a gas output interface thereof, a series pipe joint type switch valve and a fixing screw; the air inlet and distribution channel valve body is provided with a plurality of branch throttle channel air inlets which are arranged at intervals, the converging air outlet channel valve body is provided with a plurality of branch throttle channel air outlet orifices which are arranged at intervals, the branch throttle channel air outlet orifices are respectively butted with the air inlets and the air outlets of the switch valves, the series of switch valves are clamped between the air inlet and distribution channel valve body and the converging air outlet channel valve body, and the series of switch valves are fixedly connected by a plurality of screws; each branch throttle channel air inlet hole, each switch valve air outlet hole and each branch throttle channel air outlet orifice respectively form a branch throttle channel, and the branch throttle channels are connected in parallel through an air inlet split channel and a converging air outlet channel to form each parallel branch throttle channel of the digital combination valve;
The cartridge valve type structure comprises: consists of a valve body and a series of cartridge valve type switch valves; an air inlet and distribution channel and a gas input interface thereof, a converging and discharging channel and a gas output interface thereof and a plurality of cartridge valve type switch valves which are arranged at intervals are arranged in the valve body and inserted into the mounting threaded holes; each mounting threaded hole is internally provided with an air inlet hole communicated with the air inlet split-flow channel and an air outlet orifice communicated with the converging air outlet channel; screwing the cartridge valve type switching valve into the mounting threaded hole to enable the cartridge valve type switching valve to be inserted and fixed on the valve body; the air inlet hole in each mounting threaded hole, the air inlet hole and the air outlet hole of the cartridge valve type switching valve and the air outlet hole in each mounting threaded hole form a branch throttling channel, and the branch throttling channels are connected in parallel through an air inlet diversion channel and a converging air outlet channel to form each parallel branch throttling channel of the digital combination valve;
the fixed orifices of each branch throttle passage are arranged at the outlet of the branch throttle passage, and can also be arranged at the valve port of a switching valve controlled by the branch throttle passage or the inlet of the branch throttle passage; when the fixed orifices of the branch throttle channels are arranged at the valve ports of the switching valves controlled by the branch throttle channels, the ratio of the flow sectional areas of the switching valves controlled by the branch throttle channels is equal to the ratio of the throttle flow sectional areas of the branch throttle channels;
The switch valve of the manual subdivision channel can be integrated on the valve body of the digital combination valve; the manual subdivision channels can be independent of the digital combination valve body and connected with all branch throttling channels of the digital combination valve in parallel through air pipes; the manual throttle valve is arranged at a convenient operation position using the gas mixing proportioner.
Further, the gas mixing proportioner for controlling the mixing proportioning by utilizing the digital combination valve is structurally characterized in that the pressure balancing unit is connected with each path of gas flow control digital combination valve by using a gas pipe and a pipe joint; the connection structure form between each path of gas flow control digital combination valve and the gas mixing unit comprises discrete assembly type, integrated assembly type and integral integrated type:
the discrete assembly type means that each path of gas flow control digital combination valve and each path of gas mixing unit are independent components, each path of gas mixing unit consists of a gas input interface, a gas converging mixing area and a mixed gas output interface, and the gas output interfaces of each digital combination valve and the gas input interface of each gas mixing unit are assembled and connected through a pipe joint or fixedly assembled and connected through a crimping screw;
The integrated assembly type digital combination valve is characterized in that all paths of gas flow control digital combination valves are integrated on a valve body, each path of gas input interface and gas output interface are arranged on the valve body, and each path of gas inlet and outlet split channels, a converging and outlet channel and each parallel branch throttling channel of each path of gas digital combination valve are arranged in the valve body; the gas input interface of each path of gas is an air inlet split-flow channel port of the gas, and the air inlet holes of each branch throttle channel of each path of gas are communicated with the air inlet split-flow channel of the gas; the gas outlet orifices of the branch throttling channels of each path of gas are communicated with the converging gas outlet channels of the branch throttling channels, and the gas output interfaces of each path of gas are the converging gas outlet channel ports of the branch throttling channels; the method comprises the steps that a plate-connected type switch valve or a cartridge valve type switch valve is selected as a channel control switch valve, the control switch valves of all branch throttle channels of each channel of gas are integrally arranged on a valve body, the on-off states of the corresponding branch throttle channels are controlled, and a multi-channel gas flow control integrated digital combination valve group is formed; the gas mixing unit is an independent component and consists of various paths of gas input interfaces, a multi-path gas converging and mixing area and a mixed gas output interface; each path of gas output interfaces of the multi-path gas flow control integrated digital combination valve group and each path of gas input interfaces of the gas mixing unit are assembled and connected through pipe joints or fixedly assembled and connected through crimping screws;
The integral integrated type gas flow control digital combination valve and the gas mixing unit are integrated on a valve body, and one end of the valve body is provided with gas input interfaces of all paths for being respectively connected with gas output interfaces of the multi-path gas pressure balancing unit; the valve body is internally provided with air inlet and distribution channels of each path of air, and air inlet holes and air outlet orifices of each parallel branch channel, a converging air outlet channel and a control switch valve fixed mounting hole of each path of air digital combination valve; the gas input interface of each path of gas is an air inlet split-flow channel port, and the air inlet split-flow channel of each path of gas is communicated with the air inlet holes of each branch throttle channel; the air outlet orifices of the branch throttling channels of each path of air are communicated with the converging air outlet channels; the method comprises the steps that a plate-connected type switch valve or a cartridge valve type switch valve is selected as a channel control switch valve, the control switch valves of all branch throttle channels of each channel of gas are integrally arranged on a valve body, the on-off states of the corresponding branch throttle channels are controlled, and a multi-channel gas flow control integrated digital combination valve group is formed; a multi-path gas converging and mixing area is arranged in the valve body, and ports of all paths of gas converging and discharging channels are communicated with the multi-path gas converging and mixing area; the multi-path gas converging and mixing area is provided with a mixed gas output interface which is positioned at the other end part of the valve body.
The gas mixing proportioning device for controlling the mixing proportioning by using the digital combination valve provided by the invention has the following beneficial effects that the gas mixing proportioning is controlled by using the digital combination valve:
1. the gas mixing proportion and the mixing and using time can be dynamically and frequently changed in real time by adopting the digital control of the switching value.
2. The method has the advantages of simple control, high response speed, high repetition precision, convenience in maintenance and replacement of damaged parts and the like.
3. The digital combination valve predicts the cross-sectional area of flow, and omits the use of a flowmeter to measure the gas flow for mixing and proportioning.
4. The digital combination valve adopts an electromagnetic switch valve, and is a relatively economical gas mixing proportioner.
5. When the input pressure fluctuates and the output flow changes, the multipath gas pressure balancing unit balances the input pressure difference of each path of gas in real time, so that the pressure of each path of gas is equal before mixing and proportioning, and the mixing and proportioning of the gas is kept unchanged.
6. The application range is wide, and the method can be used in various application fields using the mixed gas, such as the application fields of using the mixed gas as laser cutting auxiliary gas, laser welding protective gas and the like.
Drawings
FIG. 1 is a block diagram of a gas blender that utilizes a digital combination valve to control blending proportions
FIG. 1-1 is a diagram of a digital combination valve pneumatic system
Fig. 1-1-1 are schematic diagrams of examples of digital combined valve plate connection structures
Fig. 1-1-1-1 is a schematic diagram of a digital combined valve plate and valve body structure
Fig. 1-1-1-2 are schematic diagrams of external structure of inverted base of digital combined valve plate-connected electromagnetic switch valve
FIGS. 1-1-1-3 are schematic diagrams of sectional structures of intake and diversion channels of digital combined valve plate and valve body
Fig. 1-1-1-4 are schematic sectional views of digital combined valve plate joint type valve body converging air outlet channel
FIGS. 1-1-1-5 are schematic sectional views of digital combined valve plate and valve body parallel branch throttle passage
FIGS. 1-1-2 are schematic diagrams illustrating an example of a digital combination valve clamping structure
Fig. 1-1-2-1 is a schematic diagram of a digital combination valve clamping type air inlet split-flow channel valve body structure
Fig. 1-1-2-2 are schematic diagrams of digital combination valve clamping type converging air outlet channel valve body structure
FIGS. 1-1-2-3 are schematic diagrams of digital combination valve clamping blocks
FIGS. 1-1-2-4 are schematic diagrams of the external shape of a digital combination valve clamping electromagnetic switch valve
FIGS. 1-1-2-5 are schematic sectional views of parallel branch throttle channels of digital combination valve
FIGS. 1-1-3 are schematic diagrams illustrating examples of cartridge valve type structures of digital combination valves
FIG. 1-1-3-1 is a schematic diagram of a digital combination valve cartridge valve body structure
FIGS. 1-1-3-2 are schematic top view of a digital combination valve cartridge valve body
FIGS. 1-1-3-3 are schematic diagrams of the external appearance of a digital combination valve cartridge electromagnetic switch valve
FIGS. 1-1-3-4 are schematic diagrams showing sectional structures of digital combination valve cartridge type parallel branch throttling channels
FIGS. 1-2 are diagrams of a digital combination valve pneumatic system with additional manual subdivision channels
1-2-1 are schematic diagrams of examples of digital combined valve plate-to-plate structures with additional manual subdivision channels
Fig. 1-2-1-1 is a schematic diagram of a digital combination valve plate-to-valve body structure with additional manual subdivision channels
Fig. 1-2-1-2 are schematic views of transverse cross-sectional structures of manual subdivision channels of digital combined valve plate-connected valve body
1-2-1-3 are schematic views of a digital combined valve plate and valve body manual subdivision passage longitudinal section structure
FIGS. 1-3 are schematic diagrams of examples of digital combination valve block integrated structures
Fig. 1-3-1 is a schematic diagram of top view structure of an integrated valve body of a digital combined valve group
FIGS. 1 to 4 are schematic views showing examples of structures of gas mixing units
FIG. 1-4-1 is a schematic cross-sectional view of a gas mixing unit
FIGS. 1-5 are schematic diagrams of examples of discrete and assembled structures of digital combination valves and gas mixing and proportioning units
FIGS. 1-6 are schematic diagrams of examples of integrated assembly type structures of digital combination valve and gas mixing proportion unit
FIGS. 1 to 7 are schematic diagrams showing examples of structures of digital combination valves and integrated units of gas mixture ratios
Fig. 1-7-1 are schematic top view of a digital combination valve and a gas mixing and proportioning unit integrated valve body
FIG. 2 is a schematic diagram with O 2 And N 2 Laser cutting auxiliary gas pressure control system diagram with mixing proportion function
FIG. 3 is a diagram of a gas flow control system with three-way gas mixture ratio
The reference numerals denote description: g1-gk inputs each path of gas, PBU pressure balance unit, V1-Vk each path of gas flow control digital combination valve, GMU gas mixing unit, gm output mixed gas, 1 gas input interface, 2 gas output interface, 3 gas inlet and split channels, 4 converging gas outlet channels, 5 valve body, 5-1 gas inlet and split channel valve body, 5-2 converging gas outlet channel valve body, 6 switching valve, 7 plug, 8 branch throttle channel air inlet hole, 9 branch throttle channel air outlet orifice, 10 mounting threaded hole, 11 switching valve air inlet hole, 12 switching valve air outlet hole, 13 switching valve mounting hole, 14 clamping block, 15 mounting connecting screw, 16 cartridge valve inserting mounting threaded hole, 17 valveGas port (hole) on body to manual throttle valve, gas port (hole) on 18 valve body from manual throttle valve, 19 mixing unit gas input port, 20 gas mixing zone, 21 mixed gas output port, 22 mixing unit matrix, 23 gas source, 24 relief valve, 25 gas mixing proportioner, 26 check valve, 27 gas output nozzle, 28 gas pipe, V N Nitrogen path selective switch valve V A Compressed air path selection switch valve, P pressure gauge, F flowmeter, v 0 -v (n-1) Each branch throttle passage control switch valve s respectively representing digital combination valve 0 -s (n-1) Respectively represent the throttle holes of each branch throttle channel and the throttle flow cross section area and s of the digital combination valve m All represent manual throttle valve and throttle flow cross-sectional area, v m The arrow "to" indicates the direction of gas flow, and the "…" is an ellipsis indicating that a plurality of parallel branch throttle channels and their control switch valves are omitted or that a multi-way gas flow control digital valve is omitted.
Detailed Description
The invention is further described in connection with block diagrams, pneumatic system diagrams, structural feature schematics and embodiments, but the invention is not limited to the following structural examples and application examples.
FIG. 1 is a block diagram of a gas blender that utilizes a digital combination valve to control blending proportions: the system is formed by connecting a multipath gas pressure balance unit PBU, various paths of gas flow control digital combination valves V1-Vk and a gas mixing unit GMU through a gas pipeline 28, wherein: k is the number of multiple paths of gas and is more than or equal to 2; the multipath gas pressure balancing unit PBU consists of a gas pressure balancing valve, and the gas pressure (differential pressure) balancing valve adopting the prior art of gas mixing proportion is not described in detail; the multi-path gas g1-gk is input from a pressure balance unit PBU, after pressure difference balance, the pressure of each path of gas is equal to each other, then the multi-path gas g1-gk flows into each path of gas flow control digital combination valve V1-Vk respectively, based on the volumetric flow proportioning principle of pressure balance, namely on the premise that the pressure of each path of gas is balanced (equal) before gas mixing proportioning, the ratio of the volumetric flow of each path of gas is proportional to the ratio of the flow cross section of each path of gas throttling, according to the multi-path gas mixing proportioning ratio, the flow cross section of each path of gas flow control digital combination valve V1-Vk is digitally controlled by adopting switching value, the output flow of each path of gas is respectively controlled, finally, the multi-path gas g1-gk flows into a gas mixing unit GMU, and mixed gas gm is output from a gas mixing unit GMU output interface after confluence mixing.
FIG. 1-1 is a diagram of an n-channel digital combination valve pneumatic system: control switch valve v of gas input port 1, gas inlet split flow channel 3 and each parallel branch throttle channel 0 、v 1 、…v (n-1) Orifices s of the respective parallel branch throttle channels 0 、s 1 、…s (n-1) And the converging air outlet channel 4 and the air outlet 2. Wherein: v i Sum s i Forming an ith parallel branch throttling channel, wherein i=0, 1, 2 and … (n-1), n is the number of parallel branch throttling channels and control switch valves thereof; s is(s) 0 、s 1 、…s (n-1) Simultaneously, the throttle flow sectional areas of all parallel branch throttle channels (throttle holes) are respectively shown; not in general, the switching valve is represented by a pneumatic symbol of an electromagnetic valve, and the switching valve can be a direct-acting electromagnetic valve, a step-by-step direct-acting (internal pilot) electromagnetic valve, a pilot electromagnetic valve, a miniature high-speed electromagnetic switching valve control pilot gas switching valve, a piezoelectric ceramic valve control pilot gas switching valve or an electromagnetic cartridge valve; the orifice is shown disposed at the branch orifice passage outlet section.
For an n-channel binary digital combination valve, the ratio s of the throttling flow cross-sectional areas of all the parallel branch throttling channels 0 :s 1 :s 2 :s 3 :…s i :…s （n-1） =2 0 :2 1 :2 2 : 2 3 :…2 i :…2 （n-1） Its cross-sectional area S d Equal to the sum S of the throttle flow cross-sectional areas of all the parallel branch throttle channels in the open state d ==s 0 Wherein: s is(s) 0 The minimum throttling flow cross section area in the branch throttling channel;the switching state value of the control switch valve of the ith branch throttle channel is represented by 0 or 1, 0 is represented by the ith branch throttle channel and the switch valve of the ith branch throttle channel are in the off state, and 1 is represented by the ith branch throttle channel and the switch valve of the ith branch throttle channel are in the on state; with minimum throttle flow cross-sectional area s 0 Multiple number of (a) represents the flow cross section S of the digital combination valve d /s 0 =Each branch throttle passageThe values are different, and 0, 1, 2, 3, … and (2) are formed by digital combination n -1) 2 altogether n The number of the flow cross section is correspondingly formed into 0 s and 1s 0 、2s 0 、3s 0 、…、（2 n -1）s 0 2 of (2) n The step dispersion approximates a continuous cross-sectional flow area.
For an m-channel incremental digital combined valve, each parallel branch throttling channel has the same discrete digital fixed throttling flow cross section, m is the number of parallel branch throttling channels and control switch valves thereof, and the flow cross section S of the parallel branch throttling channels d Equal to the sum of the throttle flow cross-sectional areas of all the branch throttle channels in the open state, i.e. S d ==s 0 Wherein s is 0 For the throttle flow cross-sectional area of each branch throttle passage,representing the switch state value of the i branch throttle channel control switch valve, taking 0 or 1, taking 0 to represent the i branch throttle channel and the i branch throttle channel The switch valve is in the off state, 1 is taken to represent the ith branch throttling channel and the switch valve thereof are in the on state, and the flow cross section s of each branch throttling channel is used 0 Multiple number of (a) represents the flow cross section S of the digital combination valve d /s 0 =Each branch throttle passageThe values are different, and the numbers of 0, 1, 2, 3, … and m are formed by equal increment or decrement combination, and the total m+1 flow cross section numbers are correspondingly formed to be 0 and 1s 0 、2s 0 、3s 0 、…、ms 0 Is approximated by a continuous cross-sectional flow area of m+1 discrete digitization.
Fig. 1-1-1 are schematic diagrams of examples of digital combination valve plate connection structures: digital combination valve is controlled by a valve body 5 and respective parallel branch throttle passages of a plate-connected electromagnetic switch valve 6 (including v 0 、v 1 、v 2 、…、v (n-1） ) The valve is formed by connecting and fixing screws 15, one end of the valve body is provided with a gas input interface 1, the other end of the valve body is provided with a gas output interface 2, and ports of redundant gas inlet and distribution channels and converging gas outlet channels on the valve body are blocked by plugs 7.
Fig. 1-1-1-1 is a schematic diagram of the digital combination valve plate-to-valve body structure of fig. 1-1-1: an air inlet and distribution channel 3 and a converging and air outlet channel 4 are arranged in the valve body 5 and are not communicated with each other; the two ends of the valve body are provided with a gas input interface 1 which is one port of an air inlet and distribution channel 3, and a gas output interface 2 which is one port of a converging air outlet channel 4, so that air can be introduced from one end of the valve body, the other end of the valve body can converge the air outlet channel to give out air, and the air can also be introduced from the air inlet and distribution channel of the end on the same side of the valve body and the converging air outlet channel to give out air; the upper part of the valve body 5 is provided with an air inlet hole 8 and an air outlet throttle hole 9 of each branch throttle channel which are arranged at intervals, and a mounting screw hole 10 of each plate-connected electromagnetic switch valve 6, and 4 mounting screw holes 10 are arranged corresponding to each plate-connected electromagnetic switch valve 6; the air inlet hole 8 of each branch throttle channel is communicated with the air inlet split channel 3, and the air outlet throttle hole 9 of each branch throttle channel is communicated with The converging air outlet channels 4 are communicated; the pore sizes of the air inlets 8 of the branch throttle channels are equal and are larger than the air outlet throttle holes 9 of the branch throttle channels; the air outlet orifices 9 of each branch throttle channel are fixed orifices of the channels, and the throttle flow cross section area is respectively equal to s 0 、s 1 、s 2 、s 3 、…、s i 、…、s （n-1） 。
Fig. 1-1-1-2 is a schematic diagram of an external structure of an inverted base of the digital combination valve plate-connected electromagnetic switch valve of fig. 1-1-1: the base of the plate-connected electromagnetic switch valve 6 is provided with an air inlet hole 11, an air outlet hole 12 and 4 mounting and fixing through holes 13; when the plate-connected electromagnetic switch valve 6 is arranged on the valve body 5, the switch valve air inlet 11 is communicated with the valve body branch throttle channel air inlet 8; the switch valve air outlet hole 12 is communicated with the valve body branch throttle passage air outlet throttle hole 9; 4 screws 15 penetrate through the mounting and fixing through holes 13 of the switching valve 4 and are screwed into the valve body mounting screw holes 10 for fixing.
Fig. 1-1-1-3 and fig. 1-1-4 are schematic cross-sectional structures of the intake and outtake channels and the confluence air channels of the digital combined valve plate-connected valve body of fig. 1-1-1, respectively, and fig. 1-1-1-5 is a schematic cross-sectional structure of the parallel branch throttle channel of the digital combined valve plate-connected valve body of fig. 1-1-1 perpendicular to the direction of the confluence air channels: the gas flow path of a certain branch throttle channel is a valve body gas input interface 1, a valve body gas inlet and distribution channel 3, a valve body branch throttle channel gas inlet hole 8, a gas inlet hole 11 (not shown in figures 1-1-5) on the base of the electromagnetic switch valve 6, a gas outlet hole 12 (not shown in figures 1-1-1-5) on the base of the electromagnetic switch valve 6, a valve body branch throttle channel gas outlet orifice 9, a valve body converging gas outlet channel 4 and a valve body gas output interface 2; when the electromagnetic switch valve 6 is controlled to be closed by the branch throttle passage, an air inlet hole 11 on the base of the electromagnetic switch valve 6 is not communicated with an air outlet hole 12 on the base of the electromagnetic switch valve 6, and the branch throttle passage is in a closing state; when the electromagnetic switch valve 6 is controlled to be opened, an air inlet hole 11 on the base of the electromagnetic switch valve 6 is communicated with an air outlet hole 12 on the base of the electromagnetic switch valve 6, and the branch throttle passage is in an open state; the electromagnetic switch valve of each branch throttle channel controls the on-off state of the channel, some of the branch throttle channels are in the on-state, and other branch throttle channels are in the off-state, so that different flow cross sections of the digital combination valve are formed.
FIGS. 1-1-2 are schematic diagrams of examples of clamping structures of digital combination valves: the digital combination valve is formed by clamping and fixing an air inlet and distribution channel valve body 5-1, pipe joint type electromagnetic switch valves 6 controlled by all branch throttle channels, a clamping block 14 and a converging and air outlet channel valve body 5-2 through screws 15, wherein the valve body is provided with an air input interface 1 and an air output interface 2.
Fig. 1-1-2-1 is a schematic diagram of a structure of a valve body of the clip-on intake split-flow passage of the digital combination valve of fig. 1-1-2: the valve body structure of the air inlet split flow channel valve body 5-1 in the figure 1-1-2 takes the direction of the air inlet split flow channel as an axis, the valve body structure rotates 180 degrees around the axis, the air inlet split flow channel valve body 5-1 is internally provided with an air inlet split flow channel 3 and branch throttle channel air inlets 8 which are arranged at intervals, one port of the air inlet split flow channel 3 is an air input interface 1, and the valve body is provided with a clamping mounting hole 10.
Fig. 1-1-2-2 is a schematic diagram of a structure of a valve body of the clamped converging and diverging gas passage of the digital combination valve of fig. 1-1-2: the converging air outlet channel valve body 5-2 is internally provided with a converging air outlet channel 4 and branch throttle channel air outlet orifices 9 which are arranged at intervals, one port of the converging air outlet channel 4 is an air output interface 2, and the valve body is provided with a clamping mounting hole 10.
FIGS. 1-1-2-3 are schematic diagrams of the digital combination valve clamp block of FIGS. 1-1-2: the clamping blocks 14 have screws passing through the mounting holes 10, at least two clamping blocks 14.
Fig. 1-1-2-4 are schematic views of the external shape of the clamping electromagnetic switch valve of the digital combination valve of fig. 1-1-2: the electromagnetic switch valve 6 has an air inlet 11 and an air outlet 12, the air inlet 11 is communicated with the corresponding branch throttle channel air inlet 8 on the air inlet split-flow channel valve body, and the air outlet 12 is communicated with the corresponding branch throttle channel air outlet orifice 9 of the converging air outlet channel valve body 5-2.
Fig. 1-1-2-5 are schematic structural views of a cross section of the parallel branch throttle passage of the digital combination valve clamping valve body of fig. 1-1-2 along a direction perpendicular to the converging air outlet passage: the gas flow path of a certain branch throttle channel is a gas input interface 1, an air inlet split channel 3, a branch throttle channel air inlet hole 8, an air inlet hole 11 on a valve seat of an electromagnetic switch valve 6, an air outlet hole 12 on a valve seat of the electromagnetic switch valve 6, a branch throttle channel air outlet orifice 9, a converging air outlet channel 4, a gas output interface 2, and the on-off state of the branch throttle channel is controlled by the on-off state of the electromagnetic switch valve 6.
FIGS. 1-1-3 are schematic diagrams of digital combination valve cartridge valve configurations: the digital combination valve consists of a valve body 5 and electromagnetic cartridge valve type switching valves 6 controlled by each branch throttling channel which are arranged at intervals, and the electromagnetic cartridge valve type switching valves are inserted into the installation threaded holes 16 on the valve body 5 to be screwed and fixed.
FIGS. 1-1-3-1 and 1-1-3-2 are schematic illustrations of the cartridge valve body structure and schematic illustration of the top view structure of the valve body of the digital combination valve of FIGS. 1-1-3, respectively: the upper part of the inner side offset is provided with an air inlet split channel 3, which is indicated by a dotted line, the upper part is provided with cartridge valves of all branch throttle channels which are arranged at intervals and inserted into the mounting threaded holes 16, the side wall of each mounting threaded hole 16 is provided with a branch throttle channel air inlet hole 8 which is respectively communicated with the air inlet split channel 3 through the air inlet hole 8, and one port of the air inlet split channel 3 is an air input interface 1; the middle part of the bottom of the valve body is provided with a converging air outlet channel 4, which is indicated by a dotted line, and each branch throttling channel air outlet orifice 9 arranged at intervals is communicated with the converging air outlet channel 4, and one port of the converging air outlet channel 4 is a gas output interface 2.
Fig. 1-1-3-3 are schematic diagrams of the electromagnetic cartridge valve type switching valve of the digital combination valve of fig. 1-1-3: the electromagnetic cartridge valve type switch valve 6 is provided with a plurality of air inlets 11 on the annular side surface of a valve body, an air outlet 12 on the bottom, the air inlets 11 on the side surface are inserted into mounting threaded holes 16 through cartridge valves of corresponding branch throttle channels and are communicated with the air inlet split channels 3 through corresponding branch throttle channel air inlet holes 8, and the air outlets 12 on the bottom are communicated with the converging air outlet channels 4 through corresponding branch throttle channel air outlet orifices 9.
Fig. 1-1-3-4 are schematic structural views of the digital combination valve cartridge-type parallel branch throttle passage of fig. 1-1-3, taken along a section perpendicular to the direction of the converging gas passage: the gas flow path of a certain branch throttle channel is a gas input interface 1, an air inlet split channel 3, a cartridge valve of the branch throttle channel is inserted into an air inlet hole 8 of an installation threaded hole 16, an air inlet hole 11 on the side surface of an electromagnetic cartridge valve type switch valve 6, an air outlet hole 12 on the base of the electromagnetic switch valve 6, a branch throttle channel air outlet orifice 9, a converging air outlet channel 4, a gas output interface 2, and the on-off state of the branch throttle channel is controlled by the on-off state of the electromagnetic cartridge valve type switch valve 6.
FIGS. 1-2 are digital combination valve pneumatic system diagrams of additional manual subdivision channels: adding a manual subdivision channel, v m Is a switching valve controlled by the manual subdivision channel, s m Is a manual throttle valve of the channel and adjusts the flow cross section area, s is taken m Is the minimum flow cross section s in each parallel branch channel of the digital combination valve 0 The method comprises the steps of carrying out a first treatment on the surface of the The figure shows the manual throttle valve with a rectangular broken line frame, which is not integrated on the valve body of the digital combination valve, but is installed at the operation place using the gas mixing proportioner.
Taking the plate-connected digital combination valve structure as an example, fig. 1-2-1 is a schematic diagram of an example of a digital combination valve plate-connected structure of an additional manual subdivision channel and fig. 1-2-1-1 is a schematic diagram of a digital combination valve plate-connected valve body of an additional manual subdivision channel: the valve body 5 is provided with a gas port 17 leading to the manual throttle valve, and the valve body is provided with a gas port 18 from the manual throttle valve.
Fig. 1-2-1-2 is a schematic view of a cross-sectional structure of a manual subdivision channel of the digital combination valve plate-connected valve body of fig. 1-2-1 along a direction perpendicular to a converging gas channel, and fig. 1-2-1-3 is a schematic view of a cross-sectional structure of a longitudinal section of a manual subdivision channel of the digital combination valve plate-connected valve body of fig. 1-2-1 along a direction perpendicular to the converging gas channel: the gas flow path of the manual subdivision channel is a gas input interface 1, an air inlet and distribution channel 3, a branch throttle channel air inlet hole 8, an air inlet hole 11 on a valve seat of an electromagnetic switch valve 6, an air outlet hole 12 on a valve seat of the electromagnetic switch valve 6, a branch throttle channel air outlet hole 9, a gas interface 17 leading to a manual throttle valve on a valve body, a manual throttle valve (arranged at an operation position using a gas mixing proportioner), a gas interface 18 from the manual throttle valve on the valve body, a converging air outlet channel 4, a gas output interface 2, and the switching state of the electromagnetic switch valve 6 controls the on and off states of the manual subdivision channel.
Fig. 1-3 are schematic diagrams of an example of an integrated structure of a digital combined valve block and fig. 1-3-1 are schematic diagrams of a top view structure of an integrated valve body of the digital combined valve block of fig. 1-3: in order to reduce the volume, each digital combination valve for controlling the flow of multiple paths of gases can be integrated on a valve body, and the two paths of gases are taken as an example to describe the integrated structure of the digital combination valve: the valve consists of a valve body 5, a 1 st path gas g1 control digital combination valve part and a 2 nd path gas g2 control digital combination valve part, wherein: the 1 st path gas g1 control digital combination valve part consists of a gas input interface 1 (g 1) of the gas g1, an air inlet split channel 3 (g 1), each branch throttle channel air inlet hole 8 (g 1), each branch throttle channel control switch valve 6 (g 1), each branch throttle channel air outlet orifice 9 (g 1), a converging air outlet channel 4 (g 1) and a gas g1 output interface 2 (g 1); the 2 nd path of gas g2 control digital combination valve part consists of a gas input interface 1 (g 2), an air inlet split flow channel 3 (g 2), each branch throttle channel air inlet hole 8 (g 2), each branch throttle channel control switch valve 6 (g 2), each branch throttle channel air outlet orifice 9 (g 2), a converging air outlet channel 4 (g 2) and a gas g2 output interface 2 (g 2); the mounting threaded hole 10 is used for being fixedly connected with the gas mixing unit through a screw; in the figure, the inlet split channels and the converging outlet channels are indicated by dashed lines.
Fig. 1-4 are schematic diagrams of examples of structures of gas mixing units and fig. 1-4-1 are schematic diagrams of cross-sectional structures of the gas mixing units of fig. 1-4 along a gas flow direction, which are examples of structural features of the gas mixing units by taking two paths of gases as examples. The gas mixing unit GMU is provided with a gas input port 19 (g 1) of gas g1, a gas input port 19 (g 2) of gas g2, a gas mixing region 20, a mixed gas output port 21 (gm), a mounting hole 10 and a plug 7 on a mixing unit substrate 22; wherein: the mounting hole 10 is used for being fixedly connected with the gas flow control digital combination valve through a screw, and the plug 7 is used for blocking a processing process hole of the gas mixing area. The gas flow mixing paths are such that the gas g1 and g2 outputted from the gas flow control digital combination valve flow into the gas mixing region 20 through the gas input ports 19 (g 1) and 19 (g 2), respectively, and the mixed gas flows out from the output port 21 (gm) after confluence mixing.
Fig. 1-5 are schematic diagrams of examples of discrete and assembled structures of a digital combination valve and a gas mixing and proportioning unit, and illustrate the discrete and assembled structures of the digital combination valve and the gas mixing and proportioning unit by taking two paths of gas as examples: the gas mixing unit GMU is fixedly connected with the gas g1 flow control digital combination valve V1 and the gas g2 flow control digital combination valve V2 through a pipe joint and a gas pipe 28; the gas flow mixing path is that the gas g1 flows into a digital combination valve V1, the output flow of the gas g1 is controlled by the V1 according to the gas mixing proportion, and the gas g1 is input into a gas mixing unit GMU through a pipeline 28; the gas g2 flows into the digital combination valve V2, the output flow of the gas g2 is controlled by the V2 according to the gas mixing proportion, and the gas g2 is input into the gas mixing unit GMU through a pipeline 28; the two gases g1 and g2 are mixed together in the gas mixing unit GMU, and the mixed gas flows out from the output port 21 (gm).
Fig. 1-6 are schematic diagrams of an integrated assembly structure of a digital combination valve and a gas mixing and proportioning unit, and take two paths of gases as examples to illustrate the integrated assembly structure of the digital combination valve and the gas mixing and proportioning unit: the digital combined valve integrated valve set for controlling the flow of the gases g1 and g2 is fixedly connected with a gas mixing unit GMU through a mounting threaded hole 10 by screws; the gas flow mixing path is that two paths of gas g1 and g2 respectively pass through corresponding digital combination valve parts V1 and V2 of the digital combination valve integrated valve group, output flow of the two paths of gas g1 and g2 is controlled according to the gas mixing proportion, the two paths of gas g1 and g2 flow into a gas mixing unit GMU, and mixed gas flows out of an output port 21 (gm) after converging and mixing.
Fig. 1-7 are schematic diagrams of an example of a structure of a digital combination valve and a gas mixing and proportioning unit integrally integrated, and fig. 1-7-1 are schematic diagrams of a top view structure of a valve body of a digital combination valve and a gas mixing and proportioning unit integrally integrated: in order to reduce the volume, each digital combination valve and gas mixing unit of the multi-path gas flow control can be integrated on a valve body, and the digital combination valve and the gas mixing unit are combined into a whole integrated structure by taking two paths of gases as an example: the valve consists of a valve body 5, a 1 st path gas g1 control digital combination valve part V1, a 2 nd path gas g2 control digital combination valve part V2 and a gas mixing area 20, wherein: the 1 st path gas g1 controls the digital combination valve part V1 and consists of a gas input interface 1 (g 1), an air inlet split channel 3 (g 1), each branch throttle channel air inlet hole 8 (g 1), each branch channel control switch valve 6 (g 1), each branch throttle channel air outlet throttle hole 9 (g 1) and a converging air outlet channel 4 (g 1); the 2 nd gas g2 controls the digital combination valve part V2 and consists of a gas input interface 1 (g 2), an air inlet split channel 3 (g 2), each branch throttle channel air inlet hole 8 (g 2), each branch throttle channel control switch valve 6 (g 2), each branch throttle channel air outlet throttle hole 9 (g 2) and a converging air outlet channel 4 (g 2); the converging gas outlet channel 4 (g 1) and the converging gas outlet channel 4 (g 2) of the two paths of gases are communicated with a gas mixing area 20, and the gas mixing area 20 is provided with a mixed gas output interface 21 (gm) and a processing technology hole plug 7; the inlet split channels and the converging outlet channels are shown by dashed lines; the gas flow mixing path is that two paths of gas g1 and g2 respectively pass through the respective gas control digital combination valve parts, output flow rates of the two paths of gas g1 and g2 are respectively controlled according to the gas mixing proportion, the two paths of gas flow into the gas mixing area 20, and mixed gas flows out of the output port 21 (gm) after converging and mixing.
Application example 1: three-way gas mixing proportioning device with 8-channel binary digital combination valve for controlling mixing proportioning
FIG. 1 shows the number of gas paths k as 3, wherein each of the gas flow control digital combination valves V1, V2 and V3 is a binary digital combination valve with the number of channels n as 8 in FIG. 1-1, and the flow cross section is 32mm 2 (note: corresponding to ¼ inch, i.e., 6.35mm diameter valve), the ratio of the throttle cross-sectional areas of the parallel branch throttle channels of each digital combination valve is s 0 :s 1 :s 2 :s 3 :s 4 :s 5 : s 6 :s 7 =1:2:4:8:16:32:64:128，s 0 -s 7 The flow cross-sectional areas of the parallel branch throttling channels are respectively the minimum flow cross-sectional area s 0 The multiple of (2) represents the number of the flow cross section of each digital combination valve, and each parallel branch joint of each digital combination valve circulatesThe numbers of the channel flow cross sections are 1, 2, 4, 8, 16, 32, 64 and 128 respectively, and the number S of the flow cross section of each digital combination valve d /s 0 =Each parallel branch throttle passage is opened (c i =1) and off (c i =0) different states, and combining to form a digital range of 0-255 of the flow cross section of the digital combination valve; calculating the throttle hole sectional area s of each parallel branch throttle channel i And its aperture d i I=0 to 7, i.e. s 0 =32/255=0.126mm 2 ，d 0 =0.4mm、s 1 =2s 0 =0.252mm 2 ，d 1 =0.567mm、s 2 =4s 0 =0.504mm 2 ，d 2 =0.8mm、s 3 =8s 0 =1.008mm 2 ，d 3 =1.134mm、s 4 =16s 0 =2.016mm 2 ，d 4 =1.602mm、s 5 =32s 0 =4.032mm 2 ，d 5 =2.267mm、s 6 =64s 0 =8.064mm 2 ，d 6 =3.205mm、s 7 =128s 0 =16.128mm 2 ，d 7 =4.52 mm; each parallel branch throttle passage control switch valve is a plate-connected direct-acting electromagnetic valve with a diameter of 1/4 inch, namely 6.35 mm.
Can be used as CO 2 Ar and He three-way gas mixing proportioner applied to metal welding protective gas or used as CO 2 、O 2 And N 2 The three-way gas mixing proportioner is applied to food fresh-keeping gas; the conversion relation between the flow cross section area numbers s of each path of gas proportioning proportion a% and the flow control digital combination valve is s=255/100% x a%, wherein: 255 is the maximum cross-sectional flow area number of the 8-channel binary digital combination valve, such as CO 2 The mixing proportion ratio of Ar and He gases is CO 2 Ar: he=20%: 75%:5%, calculate CO 2 The corresponding flow cross section numbers of the Ar and He gas flow control digital combined valves are 51, 191 and 13 respectively, wherein: CO 2 The digital combination valve for controlling the gas flow has the flow cross section of 51=1+2+16+32, and the digital combination valve s is controlled 0 、s 1 、s 4 Sum s 5 The branch throttling channel is in an open state s 2 、s 3 、s 6 Sum s 7 In the off state, i.e. c 0 =c 1 =c 4 =c 5 =1，c 2 =c 3 =c 6 =c 7 =0; the flow cross section of the Ar gas flow control digital combination valve is 191=1+2+4+8+16+32+128, and the digital combination valve s is controlled 0 、s 1 、s 2 、s 3 、s 4 、s 5 Sum s 7 The branch throttle passage is in an on state, s6 is in an off state, i.e. c 0 =c 1 =c 2 =c 3 =c 4 =c 5 =c 7 =1，c 6 =0; he gas flow control digital combination valve flow cross section number is 13=1+4+8, and control is carried out to make the digital combination valve s 0 、s 2 Sum s 3 The branch throttling channel is in an open state s 1 、s 4 、s 5 、s 6 Sum s 7 In the off state, i.e. c 0 =c 2 =c 3 =1，c 1 =c 4 =c 5 =c 6 =c 7 =0; the on-off states of all branch throttle channels of each path of gas flow control digital combination valve are digitally controlled by adopting the switching value of 0/1, and the flow cross section of each path of gas flow control digital combination valve is controlled, so that the output flow of each path of gas is controlled, and CO is realized 2 And (3) digital control of the mixing ratio of Ar and He gases.
Application example 2: three-way gas mixing proportioning device with additional manual subdivision channels and 5-channel binary digital combination valve for controlling mixing proportion
FIG. 1 shows the number of gas paths k as 3, wherein each of the gas flow control digital combination valves V1, V2 and V3 is a binary digital combination valve with the number of channels n as 5 in FIG. 1-1, and the flow cross section is 32mm 2 (note: corresponding to ¼ inch, i.e., 6.35mm diameter valve), the ratio of the throttle cross-sectional areas of the parallel branch throttle channels of each digital combination valve is s 0 :s 1 :s 2 :s 3 :s 4 =1:2:4:8:16，s 0 -s 4 Each of respectivelyThe flow cross section of the parallel branch throttling channels is the minimum flow cross section s 0 The multiple of (1) represents the number of the flow cross section of each digital combination valve, the numbers of the flow cross sections of the parallel branch throttling channels of each digital combination valve are 1, 2, 4, 8 and 16 respectively, and the number of the flow cross sections of each digital combination valve is S d /s 0 =Each parallel branch throttle passage is opened (c i =1) and off (c i =0) different states, and combining to form a digital range of the flow cross section of the digital combination valve from 0 to 31; calculating the throttle hole sectional area s of each parallel branch throttle channel i And its aperture d i I=0 to 4, i.e. s 0 =32/31=1.032mm 2 ，d 0 =1.146mm、s 1 =2s 0 =2.064mm 2 ，d 1 =1.62mm、s 2 =4s 0 =4.128mm 2 ，d 2 =2.292mm、s 3 =8s 0 =8.256mm 2 ，d 3 =3.24mm、s 4 =16s 0 =16.512mm 2 ，d 4 =4.58mm。
Additional manual subdivision channel maximum throttle cross-section s of digital combination valve for controlling gas flow of each path m Taken as s 0 The manual throttle valve of the manual subdivision channel is adjusted to be divided into 10 positions of 0, 0.1, 0.2, … and 0.9, and the 10 subdivision throttle flow sectional areas s of the manual subdivision channel correspond to m =0、0.1s 0 、0.2s 0 、…、0.9s 0 =0、0.103、0.206、…、0.929mm 2 。
The flow cross section S of the digital combination valve for controlling the flow of each path of gas is equal to the discrete digital flow cross section S d And an additional manual subdivision channel throttle flow cross-section s m Sum, i.e. s=s d +s m The method comprises the steps of carrying out a first treatment on the surface of the The flow section of the digital combination valve for controlling the flow of each path of gas is digital, the digital is provided with a small number to indicate that the manual subdivision channel is opened, the flow section of the manual subdivision channel is set by the manual adjustment manual throttle valve, the digital is not provided with a small number, and the digital combination valve is an integer to indicate that the manual subdivision channel is in an off state.
The on-off valve controlled by each parallel branch throttle passage of each gas control digital combination valve is a cartridge valve type electromagnetic valve with the diameter of 1/4 inch, namely 6.35 mm.
Can be used as CO 2 Ar and He three-way gas mixing proportioner applied to metal welding protective gas or used as CO 2 、O 2 And N 2 The three-way gas mixing proportioner is applied to food fresh-keeping gas; the conversion relation between the flow cross section area numbers s of each path of gas proportioning proportion a% and the flow control digital combination valve is s=31/100% x a%, wherein: 31 is the maximum flow cross section number of the 5-channel binary digital combination valve, such as CO 2 The mixing proportion ratio of Ar and He gases is CO 2 Ar: he=20%: 75%:5%, calculate CO 2 The corresponding flow cross section numbers of the Ar and He gas flow control digital combination valves are 6.2, 23.2 and 1.6 respectively, wherein: CO 2 The number of the flow cross section of the gas flow control digital combination valve is 6.2=2+4+0.2, and the digital combination valve s is controlled 1 Sum s 2 The branch throttling channel is in an open state s 0 、s 3 Sum s 4 In the off state, i.e. c 1 =c 2 =1，c 0 =c 3 =c 4 =0, the manual subdivision channel is in an open state, and the manual throttle valve is adjusted to a subdivision value 0.2 position; the flow cross section of the Ar gas flow control digital combination valve is 23.2=1+2+4+16+0.2, and the digital combination valve s is controlled 0 、s 1 、s 2 Sum s 4 The branch throttling channel is in an open state s 3 In the off state, i.e. c 0 =c 1 =c 2 =c 4 =1，c 3 =0, the manual subdivision channel is in an open state, and the manual throttle valve is adjusted to the subdivision degree 0.2 position; he gas flow control digital combination valve flow cross section number is 1.6=1+0.6, and control is carried out to make the digital combination valve s 0 The branch throttling channel is in an open state s 1 、s 2 、s 3 Sum s 4 In the off state, i.e. c 0 =1，c 1 =c 2 =c 3 =c 4 =0, the manual subdivision channel is in an open state, and the manual throttle valve is adjusted to the subdivision degree 0.6 position; by using a switchThe on and off states of each branch throttle channel of each path of gas flow control digital combination valve are digitally controlled by the closing quantity 0/1, and the flow cross section area of each path of gas flow control digital combination valve is controlled, so that the output flow of each path of gas is controlled, and CO is realized 2 And (3) digital control of the mixing ratio of Ar and He gases.
Application example 3: two-way gas mixing proportioner controlled by 5-channel incremental digital combination valve
FIG. 1 shows the number of gas paths k as 2, wherein each path of gas flow control digital combination valve V1 and V2 is an incremental digital combination valve with the number of channels n as 5 in FIG. 1-1, and the flow cross section is 32mm 2 (note: corresponding to ¼ inch, i.e., 6.35mm diameter valve), i.e., the throttle sectional areas of the parallel branch throttle channels of each digital combination valve are the same s 0 =s 1 =s 2 =s 3 =s 4 ，s 0 -s 4 The flow cross-sectional areas of the parallel branch throttling channels are respectively the branch throttling flow cross-sectional areas s 0 The multiple of (1) represents the number of the flow cross section of each digital combination valve, the numbers of the flow cross sections of the parallel branch throttling channels of each digital combination valve are respectively 1, 1 and 1, and the number of the flow cross sections of each digital combination valve is S d /s 0 =Each parallel branch throttle passage is opened (c i =1) and off (c i =0) different states, combining the two different states to form a digital range of 0-5 of the flow cross section of the digital combination valve, and calculating the throttle cross section s of each parallel branch throttle passage 0 =s 1 =s 2 =s 3 =s 4 =32/5=6.4mm 2 And its corresponding throttle aperture d 0 =d 1 =d 2 =d 3 =d 4 =2.855mm。
Several different fixed ratio values can be set, such as 0% 100%, 20% 80%, 40% 60%, 60% 40%, 80% 20%, 100% 0%, for use as CO 2 And Ar two-way gas mixing proportioner, which is applied to metal welding protective gas; flow interception of each path of gas proportion a% and flow control digital combination valve thereofThe conversion relation between the area numbers s is s=5/100% ×a%, wherein: 5 is the maximum flow cross section number of the 5-channel incremental digital combination valve, such as CO 2 Mixing ratio of the two gases with Ar is CO 2 Ar=20% 80%, and CO is calculated 2 And the corresponding flow cross section numbers of the Ar gas flow control digital combination valve are 1 and 4 respectively, wherein: CO 2 The flow section of the gas flow control digital combination valve is 1, and the control is carried out to control the digital combination valve s 0 The branch throttling channel is in an open state s 1 、s 2 、s 3 Sum s 4 In the off state, i.e. c 0 =1，c 1 =c 2 =c 3 =c 4 =0; the flow cross section of the Ar gas flow control digital combination valve is 4=1+1+1+1, and the digital combination valve s is controlled 0 、s 1 、s 2 Sum s 3 The branch throttling channel is in an open state s 4 In the off state, i.e. c 0 =c 1 =c 2 =c 3 =1，c 4 =0; the on-off states of all branch throttle channels of each path of gas flow control digital combination valve are digitally controlled by adopting the switching value of 0/1, and the flow cross section of each path of gas flow control digital combination valve is controlled, so that the output flow of each path of gas is controlled, and CO is realized 2 And Ar two-way gas mixing proportion.
Application example 4: with O 2 And N 2 Laser cutting auxiliary gas pressure control system with mixing ratio function
FIG. 2 is a schematic diagram with O 2 And N 2 The laser cutting auxiliary gas pressure control system diagram with the mixing proportion function comprises a gas source 23, a pressure reducing valve 24 and a compressed Air (Air) selective switch valve V A High pressure nitrogen (N) 2 ) Selector valve V N Oxygen (O) 2 ) And nitrogen (N) 2 ) Two-way gas mixing proportioner 25, one-way valve 26 and gas output pressure control valve V P The pressure gauge P and the gas output nozzle 27 are connected through a gas pipe 28, wherein: gas output pressure control valve V P For controlling the magnitude of the gas output pressure; the pressure gauge P is arranged on the cutting head of the laser cutting equipment and used for measuring and indicating the sprayOutputting a gas pressure value near the mouth; the nozzle 27 is an integral part of the laser cutting head.
The two-way gas mixing proportioner 25 is a binary digital combination valve with the number k of gas taking ways of 2 in FIG. 1, wherein the two-way gas flow control digital combination valves V1 and V2 are binary digital combination valves with the number n of channels of 7 in FIG. 1-1, and the flow cross section area is 32mm 2 (note: corresponding to ¼ inch, i.e., 6.35mm diameter valve), the ratio of the throttle sectional areas of the respective parallel branch throttle channels is s 0 :s 1 :s 2 :s 3 :s 4 :s 5 :s 6 =1:2:4:8:16:32:64，s 0 -s 6 The flow cross-sectional areas of the parallel branch throttling channels are respectively the minimum flow cross-sectional area s 0 The multiple of (1) represents the flow cross section of each digital combination valve, the flow cross section of each parallel branch throttling channel of each digital combination valve is 1, 2, 4, 8, 16, 32 and 64, and the flow cross section of each digital combination valve is S d /s 0 =Each parallel branch throttle passage is opened (c i =1) and off (c i =0) different states, combining the two different states to form a digital range of 0-127 of the flow cross section of the digital combination valve, and calculating the throttle cross section s of each parallel branch throttle passage i And its aperture d i I=0 to 6, i.e. s 0 =32/127=0.252mm 2 ，d 0 =0.567mm、s 1 =2s 0 =0.504mm 2 ，d 1 =0.8mm、s 2 =4s 0 =1.008mm 2 ，d 2 =1.134mm、s 3 =8s 0 =2.016mm 2 ，d 3 =1.602mm、s 4 =16s 0 =4.032mm 2 ，d 4 =2.267mm、s 5 =32s 0 =8.064mm 2 ，d 5 =3.205mm、s 6 =64s 0 =16.128mm 2 ，d 6 =4.52 mm; each parallel branch throttle passage control switch valve is a plate-connected direct-acting electromagnetic valve with a diameter of 1/4 inch, namely 6.35 mm.
Laser cutting auxiliary gas type selection: (1) Selecting compressed air Air): control compressed Air (Air) selection switch valve V A In an open state, high pressure nitrogen (N) 2 ) Selector valve V N In the off state, both V1 and V2 of the two-way gas mixing proportioner 25 are in the off state, i.e., the numbers of the flow cross sections of V1 and V2 are set to be 0; (2) 30bar high pressure nitrogen (N) 2 ): control of high pressure Nitrogen (N) 2 ) Selector valve V N In an open state, a compressed Air (Air) selection switch valve V A In the off state, both V1 and V2 of the two-way gas mixing proportioner 25 are in the off state, i.e., the numbers of the flow cross sections of V1 and V2 are set to be 0; (3) 10bar grade oxygen (O) 2 ): control of high pressure Nitrogen (N) 2 ) Selector valve V N And a compressed Air (Air) selector valve V A The two paths of gas mixing proportioners 25 are in an off state, wherein V1 is in a full-on state, namely a V1 flow sectional area number is set to 127, and V2 is in a full-off state, namely a V2 flow sectional area number is set to 0; (4) 10bar grade nitrogen (N) 2 ): control of high pressure Nitrogen (N) 2 ) Selector valve V N And a compressed Air (Air) selector valve V A The two paths of gas mixing proportioners 25 are in an off state, wherein V1 is in a full off state, namely the number of the flow cross section of V1 is set to 0, and V2 is in a full on state, namely the number of the flow cross section of V2 is set to 127; (5) Selecting oxygen (O) 2 ) And nitrogen (N) 2 ) Mixed gas: control compressed Air (Air) selection switch valve V A And high pressure nitrogen (N) 2 ) Selector valve V N Are all in an off state, according to oxygen (O 2 ) And nitrogen (N) 2 ) The mixing ratio sets the flow cross-sectional area numbers of V1 and V2 of the two-way gas mixing ratio device 25.
For the two-way gas mixture ratio digital control method of the gas mixture ratio device 25: the conversion relation between the flow cross section area numbers s of each path of gas proportioning proportion a% and the flow control digital combination valve is s=127/100% x a%, wherein: reference numeral 127 is the maximum cross-sectional flow area number of a 7-channel binary digital combination valve, e.g. O 2 And N 2 Two-way gas mixture ratioThe ratio is O 2 :N 2 =23% to 77%, calculate O 2 And N 2 The corresponding flow cross-sectional area numbers of the gas flow control digital combination valves V1 and V2 are 29 and 98 respectively, wherein: o (O) 2 The digital combination valve V1 with the gas flow control has the flow cross section of 29=1+4+8+16, and s of the digital combination valve V1 is controlled 0 、s 2 、s 3 Sum s 4 The branch throttling channel is in an open state s 1 、s 5 Sum s 6 In the off state, i.e. c 0 =c 2 =c 3 =c 4 =1，c 1 =c 5 =c 6 =0；N 2 The digital combination valve V2 with the gas flow control has the flow cross section number of 98=2+32+64, and the s of the digital combination valve V2 is controlled 1 、s 5 Sum s 6 The branch throttling channel is in an open state s 0 、s 2 、s 3 Sum s 4 In the off state, i.e. c 1 =c 5 =c 6 =1，c 0 =c 2 =c 3 =c 4 =0; the on-off states of all branch throttle channels of each path of gas flow control digital combination valve are digitally controlled by adopting the switching value of 0/1, and the flow cross section area of each path of gas flow control digital combination valve is controlled, so that the output flow of each path of gas is controlled, and O is realized 2 And N 2 And (5) digital control of the mixing ratio of the two paths of gases.
Application example 5: gas flow control system with three-way gas mixing proportion function
Fig. 3 is a diagram of a gas flow control system with three-way gas mixture ratio functionality: can be used for controlling the mixing proportion and output flow of the laser welding shielding gas, and is prepared from CO 2 Ar and He gas source 23, pressure reducing valve 24, three-way gas mixing proportioner 25 and gas output flow control valve V F The flowmeter F, the pressure gauge P and the gas output nozzle 27 are connected through a gas pipe 28; wherein: gas output flow control valve V F The device is used for controlling the output flow of the mixed gas; the flowmeter F and the pressure gauge P are arranged at a convenient observation position of the laser welding equipment and are used for measuring and indicating the output gas flow value and the pressure value near the nozzle; nozzle 27 is an integral part of the laser welding head.
The three-way gas mixing proportioner 25 is a binary digital combination valve with the number k of gas taking paths of 3 in FIG. 1, wherein three-way gas flow control digital combination valves V1, V2 and V3 are binary digital combination valves with the number n of channels of 7 in FIG. 1-1, and the flow cross section area is 32mm 2 (note: corresponding to ¼ inch, i.e., 6.35mm diameter valve), the ratio of the throttle sectional areas of the respective parallel branch throttle channels is s 0 :s 1 :s 2 :s 3 :s 4 :s 5 :s 6 =1:2:4:8:16:32:64，s 0 -s 6 The flow cross-sectional areas of the parallel branch throttling channels are respectively the minimum flow cross-sectional area s 0 The multiple of (1) represents the flow cross section of each digital combination valve, the flow cross section of each parallel branch throttling channel of each digital combination valve is 1, 2, 4, 8, 16, 32 and 64, and the flow cross section of each digital combination valve is S d /s 0 =Each parallel branch throttle passage is opened (c i =1) and off (c i =0) different states, combining the two different states to form a digital range of 0-127 of the flow cross section of the digital combination valve, and calculating the throttle cross section s of each parallel branch throttle passage i And its aperture d i I=0 to 6, i.e. s 0 =32/127= 0.252mm 2 ，d 0 =0.567mm、s 1 =2s 0 =0.504mm 2 ，d 1 =0.8mm、s 2 =4s 0 =1.008mm 2 ，d 2 =1.134mm、s 3 =8s 0 =2.016mm 2 ，d 3 =1.602mm、s 4 =16s 0 =4.032mm 2 ，d 4 =2.267mm、s 5 =32s 0 =8.064mm 2 ，d 5 =3.205mm、s 6 =64s 0 =16.128mm 2 ，d 6 =4.52 mm; each parallel branch throttle passage control switch valve is a plate-connected direct-acting electromagnetic valve with a diameter of 1/4 inch, namely 6.35 mm.
CO 2 The gas mixture ratio digital control method of the Ar and He gas mixture ratio device 25: each path of gas proportion a% and flow control digital thereofThe conversion relation between the flow cross-sectional area numbers s of the combination valve is s=127/100% x a%, wherein: 127 is the maximum cross-sectional flow area number of a 7-channel binary digital combination valve, such as CO 2 The mixing proportion ratio of Ar and He gases is CO 2 Ar: he=20%: 75%:5%, calculate CO 2 The corresponding flow cross section numbers of the Ar and He gas flow control digital combined valves are 25, 95 and 7 respectively, wherein: CO 2 The number of the flow cross section of the gas flow control digital combination valve is 25=1+8+16, and the digital combination valve s is controlled 0 、s 3 Sum s 4 The branch throttling channel is in an open state s 1 、s 2 、s 5 Sum s 6 In the off state, i.e. c 0 =c 3 =c 4 =1，c 1 =c 2 =c 5 =c 6 =0; the flow cross section of the Ar gas flow control digital combination valve is 95=1+2+4+8+16+64, and the digital combination valve s is controlled 0 、s 1 、s 2 、s 3 、s 4 Sum s 6 The branch throttle passage is in an on state, s5 is in an off state, i.e. c 0 =c 1 =c 2 =c 3 =c 4 =c 6 =1，c 5 =0; he gas flow control digital combination valve flow cross section number is 7=1+2+4, and control is carried out to make the digital combination valve s 0 、s 1 Sum s 2 The branch throttling channel is in an open state s 3 、s 4 、s 5 Sum s 6 In the off state, i.e. c 0 =c 1 =c 2 =1，c 3 =c 4 = c 5 =c 6 =0; the on-off states of all branch throttle channels of each path of gas flow control digital combination valve are digitally controlled by adopting the switching value of 0/1, and the flow cross section of each path of gas flow control digital combination valve is controlled, so that the output flow of each path of gas is controlled, and CO is realized 2 And (3) digital control of the mixing ratio of Ar and He gases.
It should be noted that: (1) The digital combination valve is one of digital control valves, and is also called as a digital valve; (2) The flow cross-sectional area of the digital combination valve in the above embodiment was 32mm 2 (note: corresponding to ¼ inches)Namely, a 6.35mm drift diameter valve) is taken as an example to calculate the throttle flow sectional area of each parallel branch throttle channel of the digital combination valve and the throttle aperture size thereof, the practical application is not limited to the specific flow sectional area, the flow sectional area of the digital combination valve is selected according to the rated flow requirement of gas, and the number of the parallel branch throttle channels of the digital combination valve is determined by combining the discrete digital approximate continuous requirement of the gas pressure and the flow to calculate and determine the throttle flow sectional area of each parallel branch throttle channel of the digital combination valve and the throttle aperture size thereof; the method is also not limited to the mixing ratio of two or three paths of gases in the embodiment, and the number of the mixed paths of the gases is determined according to the actual application requirements; (3) The invention mainly focuses on the characteristic description, does not mention a sealing ring or a sealing gasket, and in practice, the sealing ring or the sealing gasket is arranged between the digital combination valve body and the switching valve controlled by each parallel branch throttling channel of the digital combination valve body, between the digital combination valve body and the gas mixing unit and other joint surfaces, so that gas leakage is avoided; the control circuit of the gas mixing proportioner is not described, in practice, the gas mixing proportioner should be provided with a control circuit or an application device (such as a laser cutting or welding device) controller directly controls the on-off state of each branch throttling channel of each path of gas flow control digital combination valve of the gas mixing proportioner; (4) According to the gas mixing proportion, the flow sectional area numbers of the gas flow control digital combination valves of all paths are calculated and set, the proportion of the actual output mixed gas is not necessarily equal to the set gas mixing proportion accurately in consideration of the difference of the influences of the gas flow resistances of different throttle apertures, although the application is not generally affected, if the proportion of the actual output mixed gas is required to be equal to the set gas mixing proportion accurately, the flow sectional area numbers of the gas flow control digital combination valves of all paths are required to be measured and calibrated in advance to correspond to the proportion of the actual output mixed gas, and the orifice aperture size of each parallel branch throttle channel of the digital combination valve is increased or decreased in a fine adjustment mode appropriately to ensure that the proportion of the actual output mixed gas is equal to the set gas mixing proportion accurately.
It should be further noted that the gas mixing proportioner for controlling the mixing proportion by using the digital combination valve is not limited to the specific structural examples and application examples described in the specification, and all gas mixing proportion devices such as a gas mixing proportion valve, a gas mixing proportioner, a gas mixing proportion cabinet, a gas mixing proportion box and the like, which relate to using the digital combination valve as a flow control valve for controlling the gas mixing proportion, are within the protection scope of the invention.
Claims (9)
1. The gas mixing proportioner is characterized in that a digital combination valve is used as a flow control valve for controlling gas mixing proportioner, the gas mixing proportioner consists of a plurality of paths of gas pressure balancing units, each path of gas flow control digital combination valve and a gas mixing unit, the plurality of paths of gas are input from the pressure balancing units, after pressure difference balancing, the pressure of each path of gas is equal before mixing proportioner, then the plurality of paths of gas respectively flow into each path of gas flow control digital combination valve, the flow cross section of each path of gas flow control digital combination valve is digitally controlled by adopting switching value according to the ratio of the plurality of paths of gas mixing proportioners, the output flow of each path of gas is respectively controlled, and finally, the plurality of paths of gas flow into the gas mixing units are converged and mixed, and then the mixed gas is output from an output interface of the gas mixing units; the invention is applied to the field of gas mixing proportion, realizes digital control of multi-path gas mixing proportion, and is suitable for dynamically changing the proportion in real time, and the compound can be used immediately.
2. The digital combination valve according to claim 1, wherein the digital combination valve is formed by connecting in parallel a plurality of branch throttle channels with discrete digital fixed throttle flow sectional areas, wherein the on-off control of the switch valve is realized, each branch throttle channel is formed by connecting a fixed throttle hole and a switch valve in series, and the aperture size of the throttle hole determines the throttle flow sectional area of the branch throttle channel; the on-off state of the switch valve controls the on-off state of the corresponding branch throttle channel, the on-off state combination of each switch valve is digitally controlled by adopting the on-off quantity, and the on-off state combination of each parallel branch throttle channel is correspondingly controlled, so that different flow cross sections of the digital combination valve are formed; the flow cross section area of the digital combination valve is equal to the sum of the throttling flow cross sections of all the branch throttling channels in the opening state, and the flow cross section area of the digital combination valve is changed by controlling the combination of the opening state and the closing state of each branch throttling channel, so that the output discrete and digital approximate continuous gas flow is controlled.
3. The digital combination valve of claim 2, wherein the plurality of parallel branch throttle passages of the digital combination valve each have a different discrete digital fixed throttle cross-sectional flow area, and the ratio of throttle cross-sectional flow areas of the respective parallel branch throttle passages is s 0 :s 1 :s 2 :s 3 :…s i :…s （n-1） =2 0 :2 1 :2 2 :2 3 :…2 i :…2 （n-1） ，2 i Is binary bit weight, i is 0, 1, 2, …, n-1, n is the number of parallel branch throttle channels and control switch valves thereof, called n-channel binary digital combination valve, the flow cross section S thereof d Equal to the sum of the throttle flow cross-sectional areas of all the branch throttle channels in the open state, i.e. S d ==s 0 />Wherein: s is(s) 0 The minimum throttling flow cross section area in the parallel branch throttling channels is set; />The switching state value of the i branch throttling channel control switching valve is represented by 0 or 1, 0 is represented by the i branch throttling channel and the switching valve thereof in an off state, and 1 is represented by the i branch throttling channel and the switching valve thereof in an on state; with minimum cross-sectional area s of flow 0 Multiple number of (a) represents the flow cross section S of the digital combination valve d /s 0 =/>Each branch throttle passage->The values are different, and 0, 1, 2, 3, … and (2) are formed by digital combination n -1) 2 altogether n The number of the flow cross section is correspondingly formed into 0 s and 1s 0 、2s 0 、3s 0 、…、（2 n -1）s 0 2 of (2) n The level discrete digitization approximates a continuous cross-sectional flow area.
4. The digital combination valve according to claim 2, wherein the parallel branch throttle channels of the digital combination valve all have the same discrete digital fixed throttle flow cross-sectional area, m is the number of parallel branch throttle channels and their control switch valves, called m channel incremental digital combination valve, whose flow cross-sectional area S d Equal to the sum of the throttle flow cross-sectional areas of all the branch throttle channels in the open state, i.e. S d ==s 0 />Wherein s is 0 For the throttle flow cross-section of each branch throttle channel +.>The switch state value of the i branch throttle passage control switch valve is 0 or 1, 0 is 0 and the i branch throttle passage and the switch valve thereof are in the off state, 1 is the i branch throttle passage and the switch valve thereof are in the on state, and the flow cross section s of each branch throttle passage is used 0 Multiple number of (a) represents the flow cross section S of the digital combination valve d /s 0 =/>Each branch jointFlow channel->The values are different, and the numbers of 0, 1, 2, 3, … and m are formed by equal increment or decrement combination, and the total m+1 flow cross section numbers are correspondingly formed to be 0 and 1s 0 、2s 0 、3s 0 、…、ms 0 Is approximated by a continuous cross-sectional flow area of m+1 discrete digitization.
5. The digital combination valve according to claim 2, characterized in that a parallel branch throttle passage (called manual subdivision passage for short) for manual subdivision of the flow section is added; the manual subdivision channel consists of a switch valve and a manual throttle valve which are connected in series, wherein the maximum throttle flow cross section of the manual throttle valve is equal to the minimum throttle flow cross section s of the digital combination valve branch throttle channel as claimed in claim 3 or claim 4 0 The method comprises the steps of carrying out a first treatment on the surface of the The on-off state of the on-off valve controls the on-off state of the manual subdivision channel, the flow cross section of the manual subdivision channel is changed by manually adjusting the flow cross section of the manual throttle valve, and the approximation continuous control of the gas flow is realized by combining discrete digital control of the flow cross section of the digital combination valve; the flow cross section area of the digital combination valve is the discrete digital flow cross section area S of the digital combination valve d And manually subdividing the throttle flow cross-sectional area s of the channel m Sum s=s d +s m 。
6. The digital combination valve of claim 1, which may be a binary digital combination valve as claimed in claim 3, an incremental digital combination valve as claimed in claim 4, or a parallel combination of both.
7. The digital combination valve according to claim 2, wherein the switch valves include direct-acting solenoid valves, step-by-step direct-acting (internal pilot) solenoid valves, pilot solenoid valves, miniature high-speed solenoid switch valve control pilot gas switch valves, piezoceramic valve control pilot gas switch valves, and electromagnetic cartridge valve types; the installation types of the switch valve comprise plate connection type, pipe connection type and cartridge valve type.
8. The digital combination valve according to claim 2, wherein the valve is configured as a gas pipe connection switch valve, but preferably is configured as a plate, clip or cartridge integrated compact structure:
the board connection structure is as follows: consists of a valve body, a series of plate-connected switch valves and fixing screws; the valve body is internally provided with an air inlet split flow channel and a gas input interface thereof, a converging air outlet channel and a gas output interface thereof, a plurality of branch throttle channel air inlet holes, an air outlet throttle hole and a switch valve fixing screw hole which are arranged at intervals; the air inlet holes of all branch throttle channels are communicated with the air inlet split-flow channels, and the air outlet orifices of all branch throttle channels are communicated with the converging air outlet channels; the air inlet and the air outlet of the plate-connected switch valve are respectively butted with the air inlet and the air outlet orifice of the branch throttling channel on the valve body, and the plate-connected switch valve is fixed on the valve body by using screws; in the valve body, each branch throttle channel air inlet hole, each plate-connected switch valve air inlet hole, each air outlet hole of the corresponding switch valve and each branch throttle channel air outlet orifice form a branch throttle channel, and the branch throttle channels are connected in parallel through an air inlet split channel and a converging air outlet channel to form each parallel branch throttle channel of the digital combination valve;
The clamping structure comprises: the device consists of an air inlet and split-flow channel valve body and a gas input interface thereof, a converging and outlet channel valve body and a gas output interface thereof, a series pipe joint type switch valve and a fixing screw; the air inlet and distribution channel valve body is provided with a plurality of branch throttle channel air inlets which are arranged at intervals, the converging air outlet channel valve body is provided with a plurality of branch throttle channel air outlet orifices which are arranged at intervals, the branch throttle channel air outlet orifices are respectively butted with the air inlets and the air outlets of the switch valves, the series of switch valves are clamped between the air inlet and distribution channel valve body and the converging air outlet channel valve body, and the series of switch valves are fixedly connected by a plurality of screws; each branch throttle channel air inlet hole, each switch valve air outlet hole and each branch throttle channel air outlet orifice form a branch throttle channel, and the branch throttle channels are connected in parallel through an air inlet split channel and a converging air outlet channel to form each parallel branch throttle channel of the digital combination valve;
the cartridge valve type structure comprises: consists of a valve body and a series of cartridge valve type switch valves; an air inlet and distribution channel and a gas input interface thereof, a converging and discharging channel and a gas output interface thereof and a plurality of cartridge valve type switch valves which are arranged at intervals are arranged in the valve body and inserted into the mounting threaded holes; each mounting threaded hole is internally provided with an air inlet hole communicated with the air inlet split-flow channel and an air outlet orifice communicated with the converging air outlet channel; screwing the cartridge valve type switching valve into the mounting threaded hole to enable the cartridge valve type switching valve to be inserted and fixed on the valve body; the air inlet hole in each mounting threaded hole, the air inlet hole and the air outlet hole of the cartridge valve type switching valve and the air outlet hole in each mounting threaded hole form a branch throttling channel, and the branch throttling channels are connected in parallel through an air inlet diversion channel and a converging air outlet channel to form each parallel branch throttling channel of the digital combination valve;
The fixed orifices of each branch throttle passage are arranged at the outlet of the branch throttle passage, and can also be arranged at the valve port of a switching valve controlled by the branch throttle passage or the inlet of the branch throttle passage; when the fixed orifices of the branch throttle channels are arranged at the valve ports of the switching valves controlled by the branch throttle channels, the ratio of the flow sectional areas of the switching valves controlled by the branch throttle channels is equal to the ratio of the throttle flow sectional areas of the branch throttle channels;
the switch valve of the manual subdivision channel can be integrated on the valve body of the digital combination valve; the manual subdivision channels can be independent of the digital combination valve body and connected with all branch throttling channels of the digital combination valve in parallel through air pipes; the manual throttle valve is arranged at a convenient operation position using the gas mixing proportioner.
9. The gas mixing proportioner for controlling mixing proportioning by utilizing a digital combination valve according to claim 1, which is structurally characterized in that a gas pipe and a pipe joint are used for connection between the pressure balancing unit and each path of gas flow control digital combination valve; the connection structure form between each path of gas flow control digital combination valve and the gas mixing unit comprises discrete assembly type, integrated assembly type and integral integrated type:
The discrete assembly type means that each path of gas flow control digital combination valve and each path of gas mixing unit are independent components, each path of gas mixing unit consists of a gas input interface, a gas converging mixing area and a mixed gas output interface, and the gas output interfaces of each digital combination valve and the gas input interface of each gas mixing unit are assembled and connected through a pipe joint or fixedly assembled and connected through a crimping screw;
the integrated assembly type digital combination valve is characterized in that all paths of gas flow control digital combination valves are integrated on a valve body, each path of gas input interface and gas output interface are arranged on the valve body, and each path of gas inlet and outlet split channels, a converging and outlet channel and each parallel branch throttling channel of each path of gas digital combination valve are arranged in the valve body; the gas input interface of each path of gas is an air inlet split-flow channel port of the gas, and the air inlet holes of each branch throttle channel of each path of gas are communicated with the air inlet split-flow channel of the gas; the gas outlet orifices of the branch throttling channels of each path of gas are communicated with the converging gas outlet channels of the branch throttling channels, and the gas output interfaces of each path of gas are the converging gas outlet channel ports of the branch throttling channels; the method comprises the steps that a plate-connected type switch valve or a cartridge valve type switch valve is selected as a channel control switch valve, the control switch valves of all branch throttle channels of each channel of gas are integrally arranged on a valve body, the on-off states of the corresponding branch throttle channels are controlled, and a multi-channel gas flow control integrated digital combination valve group is formed; the gas mixing unit is an independent component and consists of various paths of gas input interfaces, a multi-path gas converging and mixing area and a mixed gas output interface; each path of gas output interfaces of the multi-path gas flow control integrated digital combination valve group and each path of gas input interfaces of the gas mixing unit are assembled and connected through pipe joints or fixedly assembled and connected through crimping screws;
The integral integrated type gas flow control digital combination valve and the gas mixing unit are integrated on a valve body, and one end of the valve body is provided with gas input interfaces of all paths for being respectively connected with gas output interfaces of the multi-path gas pressure balancing unit; the valve body is internally provided with air inlet and distribution channels of each path of air, and air inlet holes and air outlet orifices of each parallel branch channel, a converging air outlet channel and a control switch valve fixed mounting hole of each path of air digital combination valve; the gas input interface of each path of gas is an air inlet split-flow channel port, and the air inlet split-flow channel of each path of gas is communicated with the air inlet holes of each branch throttle channel; the air outlet orifices of the branch throttling channels of each path of air are communicated with the converging air outlet channels; the method comprises the steps that a plate-connected type switch valve or a cartridge valve type switch valve is selected as a channel control switch valve, the control switch valves of all branch throttle channels of each channel of gas are integrally arranged on a valve body, the on-off states of the corresponding branch throttle channels are controlled, and a multi-channel gas flow control integrated digital combination valve group is formed; a multi-path gas converging and mixing area is arranged in the valve body, and ports of all paths of gas converging and discharging channels are communicated with the multi-path gas converging and mixing area; the multi-path gas converging and mixing area is provided with a mixed gas output interface which is positioned at the other end part of the valve body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311393367.XA CN117234249A (en) | 2023-10-25 | 2023-10-25 | Gas mixing proportioning device using digital combination valve to control mixing proportioning |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311393367.XA CN117234249A (en) | 2023-10-25 | 2023-10-25 | Gas mixing proportioning device using digital combination valve to control mixing proportioning |
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| Publication Number | Publication Date |
|---|---|
| CN117234249A true CN117234249A (en) | 2023-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311393367.XA Pending CN117234249A (en) | 2023-10-25 | 2023-10-25 | Gas mixing proportioning device using digital combination valve to control mixing proportioning |
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| Country | Link |
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| CN (1) | CN117234249A (en) |
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2023
- 2023-10-25 CN CN202311393367.XA patent/CN117234249A/en active Pending
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