CN113202658B - Small-flow miniature electromagnetic valve and assembly adjusting method thereof - Google Patents
Small-flow miniature electromagnetic valve and assembly adjusting method thereof Download PDFInfo
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- CN113202658B CN113202658B CN202110501236.3A CN202110501236A CN113202658B CN 113202658 B CN113202658 B CN 113202658B CN 202110501236 A CN202110501236 A CN 202110501236A CN 113202658 B CN113202658 B CN 113202658B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0248—Injectors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/02—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with gaseous fuels
- F02D19/021—Control of components of the fuel supply system
- F02D19/023—Control of components of the fuel supply system to adjust the fuel mass or volume flow
- F02D19/024—Control of components of the fuel supply system to adjust the fuel mass or volume flow by controlling fuel injectors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0027—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures the fuel being gaseous
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0248—Injectors
- F02M21/0251—Details of actuators therefor
- F02M21/0254—Electric actuators, e.g. solenoid or piezoelectric
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0248—Injectors
- F02M21/0257—Details of the valve closing elements, e.g. valve seats, stems or arrangement of flow passages
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0675—Electromagnet aspects, e.g. electric supply therefor
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
The invention discloses a small-flow miniature electromagnetic valve and an assembly adjusting method thereof, and the small-flow miniature electromagnetic valve comprises a split end shell, a middle shell and an air outlet joint, wherein a magnetizable sleeve is arranged in a valve body, a coil assembly is arranged between the sleeve and the valve body, an armature, the coil assembly and a stop iron are sequentially arranged on the sleeve, a magnetic isolating ring is arranged on the periphery of the armature, a spring for pressing the armature on a valve seat is arranged at the top of the armature, the coil assembly and the stop iron are externally connected with the middle shell, the middle shell is connected with the end shell and the air outlet joint, the armature and the valve seat are arranged between the middle shell and the air outlet joint, and the end shell, the middle shell and the air outlet joint are assembled and then arranged in the gas injection electromagnetic valve seat. The invention can realize accurate measurement control on the gas injection amount and respond to the instruction requirement of the CPU in time, thereby achieving the optimal air-fuel ratio and meeting the emission requirement; meanwhile, adverse effects on the coil assembly during assembly can be avoided, and the opening stroke and the elasticity of the armature during opening can be adjusted.
Description
Technical Field
The invention relates to the technical field of gas injection electromagnetic valves, in particular to a small-flow miniature electromagnetic valve and an assembly adjusting method thereof.
Background
The electromagnetic valve is an industrial device controlled by electromagnetism, is an automatic basic element for controlling fluid and belongs to an actuator. Used in industrial control systems to regulate the direction, flow, velocity and other parameters of a medium. The solenoid valve can be matched with different circuits to realize expected control, and the control precision and flexibility can be ensured. At present, most of domestic gas metering electromagnetic valves applied to engines have the problems of inaccurate gas metering control, unstable flow, leakage and the like, so that the optimal air-fuel ratio cannot be achieved, and the emission requirement cannot be met; and when the electromagnet of the existing gas metering electromagnetic valve is in a working state for a long time, serious heating is easily caused, the service life of the electromagnet is influenced, and further the service life of the electromagnetic valve is influenced.
The invention discloses a high-precision gas injection valve, which belongs to an electric injection valve of a gas automobile, and is characterized in that a mandril guide seat is pressed in a valve body, a pole shoe is pressed at the left end of the valve body, an inner hole of the valve body is movably matched with a small-flow miniature electromagnetic valve and an assembly and adjustment method of the miniature electromagnetic valve, a valve seat, a spring and a spring seat assembly are arranged at the right end of the valve body, a steel ball is placed in the inner hole of the valve seat, an armature pipe assembly is welded with the pole shoe, a coil assembly is arranged outside the armature pipe assembly and is fixed through an elastic pad and a screw, an air inlet hole is formed at the right end of the valve body, and an air injection hole is formed at the left end of the valve body.
Firstly, the technical scheme of the patent adopts the steel ball and the valve seat to realize opening and closing, so that the problems of inaccurate gas metering control, unstable flow, leakage and the like cannot be solved, the optimal air-fuel ratio cannot be achieved, and the emission requirement cannot be met; secondly, in the technical scheme of the patent, the coil assembly needs to be installed firstly and then the appearance needs to be injection molded, the coil assembly is impacted and damaged by injection molding pressure and temperature, and the risks of open circuit and short circuit exist; and the structural style of installing the coil assembly first and then molding plastics the appearance can occupy great space, and the wire winding diameter in the coil assembly receives the restriction, can't increase the line footpath of enameled wire, has restricted allowable current and thermal capacity, has restricted the heat dispersion of coil, has the coil overheated problem. In addition, in the technical scheme of the patent, the stroke of the injection valve is controlled by adjusting the assembling position of the valve seat, and the reverse stroke of the valve is determined by the assembling position of the armature pipe assembly, but the stroke of the injection valve, the reverse stroke of the valve and the stress of the spring seat assembly are mutually related, so that the stress condition of the valve core assembly cannot be adjusted under the condition of a certain opening degree, and the opening degree cannot be adjusted under the condition of a certain stress of the valve core assembly. Therefore, the technical solutions disclosed in the above patents have disadvantages in terms of control accuracy, adjustment manner, and service life.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a small-flow miniature electromagnetic valve and an assembly adjusting method thereof, and the small-flow miniature electromagnetic valve using the small-flow miniature electromagnetic valve and the assembly adjusting method thereof, and solves the technical problems of low control precision, inconvenient adjusting mode and long service life of the conventional gas electromagnetic valve.
The technical scheme of the invention is realized as follows: a small-flow miniature electromagnetic valve comprises a split valve body, wherein the valve body comprises a split end shell, a middle shell and an air outlet joint, a magnetizable sleeve is arranged in the valve body, a coil assembly is arranged between the sleeve and the valve body, and an armature can do corresponding axial movement under the magnetization effect of the coil assembly. The sleeve is sequentially provided with an armature, a coil assembly and a stop iron, a magnetism isolating ring is arranged on the periphery of the armature, a valve seat is arranged at the lower end of the armature, a spring for pressing the armature on the valve seat is arranged at the top of the armature, the coil assembly and the stop iron are externally connected with and installed on a middle shell, the first end of the middle shell is connected with an end shell, the second end of the middle shell is connected with an air outlet connector, the armature and the valve seat are arranged between the middle shell and the air outlet connector, and the end shell, the middle shell and the air outlet connector are arranged in a gas injection electromagnetic valve seat after being assembled.
Furthermore, the valve seat is in sealing fit with the armature through at least two annular bulges arranged at intervals and the annular rubber pads, the annular rubber pads are pressed between the tops of the annular bulges, the peripheral space of the armature is a ventilation space and/or an air passing hole is formed in the armature, the air passing hole is formed in the outer side of the annular rubber pad or/and the inner ring portion of the annular rubber pad, and the valve seat is provided with air holes formed between the adjacent annular bulges. When the armature is in press fit with the valve seat, the vent hole cannot be communicated with the air passing hole, and then the vent hole cannot be communicated with the air passing hole. The coil assembly generates a magnetic field after being electrified, the armature and the sleeve are magnetized, attraction is generated between the armature and the sleeve, the armature is attracted, the armature overcomes the elasticity of the spring, the air passing hole can be communicated with the air vent between the annular bulges after the armature is separated from the valve seat, and the valve outlet is opened.
Furthermore, the air passing holes comprise a plurality of peripheral air passing holes positioned on the outer side of the annular rubber pad and/or a middle air passing hole positioned around the inner wall of the annular rubber pad, the sleeve is provided with a first air inlet hole communicated with the middle air passing hole and the outer part of the sleeve, the armature is provided with a magnetic isolating ring positioned in the middle shell at the periphery, and the middle shell is provided with a second air inlet hole communicated with the inside and the outside. The gas of the electromagnetic valve gas inlet can penetrate through the armature through the peripheral gas passing hole and the middle gas passing hole and further reach the middle part and the edge part of the valve seat, so that the stability of the armature in the normally closed state and the normally opened state can be guaranteed, and the response timeliness of the armature in the opening process can be guaranteed. Meanwhile, the peripheral air passing holes and the middle air passing holes in the armature are of a plurality of small hole structures, the small hole structures can uniformly ventilate, and the small holes are high in machining precision and good in consistency and are the basic premise for accurately controlling flow.
Furthermore, first inlet aperture and second inlet aperture all are provided with a plurality of, and the second inlet aperture sets up the toper portion at middle casing, and the second inlet aperture slope makes air current control more accurate towards the setting position of first inlet aperture through the aperture structure of mutually supporting.
Furthermore, the plurality of first air inlet small holes are arranged in the axial direction of the sleeve in a layered mode and are arranged at intervals in the circumferential direction of the sleeve, the second air inlet small holes are arranged at intervals in the circumferential direction around the axis of the middle shell, and the second air inlet small holes incline to the positions between the first air inlet small holes in the adjacent layers.
Furthermore, a third air inlet hole communicated with the armature is formed between the outer wall of the sleeve at the first air inlet small hole and the inner wall of the middle shell at the second air inlet small hole, so that a multi-directional flow passage is provided for air flow.
Furthermore, a filter screen is arranged outside the second air inlet small hole, and the precision of the filter screen is 3.5 microns, so that the device has a filtering function.
Furthermore, the annular bulge is arranged on the end face of the valve seat, the annular rubber pad is arranged on the end face of the armature, and the smallest annular bulge corresponds to the middle of the annular face of the annular rubber pad. When the armature is normally closed, the gas passing through the middle gas passing hole can reach the lower side of the annular rubber pad, so that the stability and reliability of the attachment of the annular rubber pad and the armature are ensured; in addition, in the process that the armature breaks away from the valve seat, the gas reaching the lower side of the annular rubber pad through the middle air passing hole can play an auxiliary role, so that the armature and the valve seat can be quickly separated, the adhesion is avoided, and the delay is shortened. The vent hole is opposite to the outer edge of the annular rubber pad, so that in the venting process after the armature is separated from the valve seat, airflow from the periphery and the periphery of the armature through the vent hole directly enters the vent hole through the annular rubber pad, and although the airflow flowing from the middle part of the armature through the vent hole flows through the inner wall of the annular rubber pad, the airflow between the annular rubber pad and the valve seat can lift the annular rubber pad.
Furthermore, an adjusting pin is arranged in the sleeve, and the pretightening force applied to the armature by the spring can be changed by changing the relative position of the adjusting pin and the sleeve, so that the outlet flow during the action of the armature is adjusted. The spring sets up between adjusting pin and armature, is provided with the mounting groove on the terminal surface that armature deviates from the disk seat, and the one end setting of spring is in the mounting groove, the other end insert in the sleeve and with the tip top connection of adjusting pin, and the sleeve deviates from the one end of armature and is provided with to dismantle and is connected with end cover.
Further, annular is protruding to be set gradually first annular arch, second annular arch and third annular arch from little to big according to the diameter, the air vent sets up between first annular arch, second annular arch, and the third annular is protruding to be relative with the outer fringe part of armature, the peripheral air passing hole corresponds the setting between second annular arch and third annular arch. The height of the third annular bulge is smaller than the heights of the first annular bulge and the second annular bulge, so that the depth indentation of the annular rubber pad caused by the first annular bulge and the second annular bulge under the pressure of the spring can be avoided, the opening stroke is not influenced by the annular rubber pad, and the stroke change cannot be caused to influence the flow precision and the response speed. The peripheral gas passing holes are correspondingly arranged between the second annular bulge and the third annular bulge, so that gas at the inlet of the valve body can reach the end face of the valve seat before the armature is separated from the valve seat, and the response speed and reliability are further improved.
Further, the coil assembly comprises a coil framework sleeved outside the sleeve, an enameled wire is wound on the coil framework, the enameled wire is sealed and arranged outside the sleeve through the coil framework and a sealing structure matched with the end shell, the middle shell and the air outlet connector respectively, and the sealing structure comprises a first sealing ring, a second sealing ring, a third sealing ring, a fourth sealing ring and a fifth sealing ring which are arranged between the outlet outer wall of the air outlet connector and the fuel gas injection port of the engine, between the air outlet connector and the middle shell, between the coil framework and the stop iron, between the middle shell and the valve body mounting seat and between the coil framework and the middle shell respectively.
Furthermore, an adjusting pad for adjusting the opening degree of the armature is arranged between the magnetism isolating ring and the middle shell in the axial direction, and the inner diameter of the adjusting pad and the inner diameter of the magnetism isolating ring are both larger than the outer diameter of the armature. The cross-sectional area of the armature is larger than that of the sleeve, so that the opening stroke can be controlled by controlling the distance between the armature and the end face of the sleeve, and the adjustment of the adjusting pin to the pre-tightening force of the spring can be independent. The end face of the armature and the end face of the sleeve are both planes, so that after the armature moves to the maximum opening degree, the armature can be attached to the end face of the sleeve, and the influence on the stability and the accuracy of flow control due to the fact that turbulent flow occurs between the armature and the sleeve is prevented.
Furthermore, a chamfer transition surface is arranged at the transition position of the top of the annular protrusion and the inner side wall and the transition position of the outer side wall of the annular protrusion, so that the fitting precision of the armature and the valve seat is further enhanced, and meanwhile, the response speed of opening the armature is also improved.
A method for assembling and adjusting a small-flow miniature electromagnetic valve comprises the steps of injecting an end shell outside a sleeve, installing a stop iron outside the sleeve before or after the end shell is injected, installing a coil assembly and a middle shell on the sleeve and fixedly clamping the sleeve with the end shell, installing an adjusting pad, a magnetic isolating ring, an armature and a valve seat at the second end of the middle shell, and connecting the middle shell outside the valve seat with an air outlet joint.
Further, the adjusting pin and the spring are installed from the adjusting end of the sleeve or inserted into the other end of the sleeve, and the spring is installed between the armature and the adjusting pin independently or is installed along with the armature after being assembled with the installation groove of the armature.
Furthermore, when the opening stroke of the armature is adjusted, the adjusting pads with different sizes are replaced or the assembling positions among the valve seat, the air outlet joint and the middle shell are changed to control the opening stroke between the armature and the end part of the sleeve or the mounting end face of the adjusting pad, and then the air outlet joint and the middle shell are connected and fixed.
Furthermore, the opening stroke and the ventilation flow are relatively independently adjusted, and when the ventilation flow is adjusted, the relative position of the adjusting pin and the sleeve is changed, so that the compression force of the spring is changed to adjust the outlet flow when the armature acts.
The invention has high metering accuracy, is mainly realized by controlling the flow accuracy, namely the opening and the response speed of the valve, simultaneously adopts a multi-pore structure to uniformly ventilate, has high processing accuracy and good consistency of pores, is also the basic premise of accurate flow control, adopts a split structure for ensuring the consistency of the opening, and realizes the adjustment of the opening stroke and the spring pretightening force; meanwhile, the annular rubber pad on the armature iron is made of the low-pressure-change nitrile rubber special for the fuel engine, the problem of rubber modification caused by adhesives is solved, the durability of the electromagnetic valve is improved, the problems of unstable flow, leakage and the like caused by valve core abrasion caused by friction are solved, the indentation depth of a sealing surface after long-time opening and closing actions is ensured to be negligible, the stroke cannot be changed, and the flow control precision and the response speed cannot be influenced. The method ensures timely and accurate response to the instruction requirement of the CPU, and avoids the problem of not reaching the optimal gas air-fuel ratio due to inaccurate precision control or response delay, thereby having great significance in environmental protection. The invention can adjust different outlet flows according to requirements, the electromagnet can keep the electromagnetic valve in an open or close state without being continuously in a high-current power supply state, and can realize accurate metering control on the gas injection quantity and respond to the instruction requirement of a CPU in time, thereby achieving the optimal air-fuel ratio, meeting the emission requirement and prolonging the design life from 1.5 hundred million times to 6 hundred million times.
Drawings
In order to illustrate the embodiments of the invention more clearly, the drawings that are needed in the description of the embodiments will be briefly described below, it being apparent that the drawings in the following description are only some embodiments of the invention, and that other drawings may be derived from those drawings by a person skilled in the art without inventive effort.
FIG. 1 is a cross-sectional view of the present invention;
FIG. 2 is an enlarged view taken at A in FIG. 1;
FIG. 3 is an enlarged view of the armature of FIG. 1;
fig. 4 is a bottom view of the armature;
FIG. 5 is an enlarged view of the valve seat of FIG. 1;
FIG. 6 is a perspective view of the valve seat;
FIG. 7 is a top view of the valve seat;
number in the figure:
1-sleeve, 101-first air inlet small hole, 102-second air inlet small hole, 103-third air inlet hole;
2-stop iron; 3-adjusting the pin; 4-a middle shell; 5-a coil assembly; 6-adjusting the cushion; 7-magnetism isolating ring;
8-armature, 81-annular rubber pad, 82-air passing hole, 821-peripheral air passing hole, 822-middle air passing hole and 83-mounting groove;
9-valve seat, 91-annular projection, 911-first annular projection, 912-second annular projection, 913-third annular projection, 92-vent hole, 93-connecting rib;
10-an air outlet joint;
11-a first sealing ring, 12-a second sealing ring, 13-a third sealing ring, 14-a fourth sealing ring, 15-a fifth sealing ring;
16-a spring; 17-step surface; 18-an end housing; 19-a step platform; 20-sealing the end cover; 21-a filter screen.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
Embodiment 1, a small flow rate miniature solenoid valve, as shown in fig. 1, includes a split type valve body, the valve body includes a split type end casing 18, a middle casing 4 and an air outlet joint 10, the end casing 18, the middle casing 4 and the air outlet joint 10 are detachably connected.
The valve is characterized in that a magnetizable sleeve 1 is arranged in the valve body, a coil assembly 5 is arranged between the sleeve 1 and the valve body, the coil assembly 5 and a stop iron 2 are sequentially arranged on the sleeve 1, and the stop iron 2 is axially fixed through a step platform 19 outside the sleeve 1. The periphery of the armature 8 is provided with a magnetism isolating ring 7, and the armature 8 can do corresponding axial movement under the magnetization effect of the coil component 5. The lower end of the armature 8 is provided with a valve seat 9, the top of the armature 8 is provided with a spring 16 which presses the armature 8 on the valve seat 9, and when the coil assembly is not electrified, the armature 8 is in press fit with the valve seat 9 under the action of the elastic force of the spring 16.
The coil assembly 5 and the stop iron 2 are externally connected with a middle shell 4, the first end of the middle shell 4 is connected with the end shell 18, and the second end of the middle shell is connected with the air outlet joint 10. The armature 8 and the valve seat 9 are arranged between the middle shell 4 and the gas outlet connector 10, and the end shell 18, the middle shell 4 and the gas outlet connector 10 are arranged in the gas injection electromagnetic valve seat after being assembled.
Further, as shown in fig. 1, an adjusting pad 6 for adjusting the opening of the armature 8 is disposed between the magnetism isolating ring 7 and the middle housing 4 in the axial direction, and the inner diameter of the adjusting pad 6 and the inner diameter of the magnetism isolating ring 7 are both larger than the outer diameter of the armature 8, so that the action of the armature 8 is prevented from being influenced, and a peripheral passing space is provided for circulating gas.
The valve seat 9 is in sealing fit with the armature 8 through at least two annular protrusions 91 and annular rubber pads 81 which are arranged at intervals, the annular rubber pads 81 are pressed between the tops of the annular protrusions 91, the peripheral space of the armature 8 is a ventilation space and/or air passing holes 82 are formed in the armature 8, the air passing holes 82 are located in the outer side of the annular rubber pads 81 or/and the inner ring portion of the annular rubber pads 81, and the valve seat 9 is provided with air passing holes 92 located between the adjacent annular protrusions 91. As shown in fig. 5 to 7, the vent holes 92 are kidney-shaped holes, and a connecting rib 93 is arranged between adjacent kidney-shaped holes. The annular rubber pad 81 is low-pressure-change nitrile rubber, so that the indentation depth of a sealing surface is very small after the valve is opened and closed for a long time, the flow precision and the response speed are not influenced due to the change of a stroke, the valve leakage caused by the firm bonding between a sealing element and a metal piece and the falling of the sealing element is avoided, and the requirements on natural gas medium and high service life performance are met through multiple tests.
When the armature 8 is press-fitted to the valve seat 9, the vent hole 92 cannot communicate with the air passing hole 82, and therefore cannot vent. The coil component 5 generates a magnetic field after being electrified, the armature 8 and the sleeve 1 are magnetized, attraction force is generated between the armature 8 and the sleeve 1, the armature 8 is attracted, the armature 8 overcomes the elastic force of the spring 16 to move, the air hole 82 can be communicated with the air hole 92 between the annular bulges 91 after the armature 8 is separated from the valve seat 9, and then the valve outlet is opened.
As shown in fig. 2 to 4, the air passing holes 82 include a plurality of peripheral air passing holes 821 located outside the annular rubber pad 81 and/or a middle air passing hole 822 located around the inner wall of the annular rubber pad 81, the sleeve 1 is provided with a first air inlet small hole 101 communicating the middle air passing hole 822 with the outside of the sleeve 1, the armature 8 is provided with a magnetism isolating ring 7 located in the middle housing 4 at the periphery, and the middle housing 4 is provided with a second air inlet small hole 102 communicating the inside and the outside.
The first small air inlet holes 101 and the second small air inlet holes 102 are provided with a plurality of small air inlet holes 102, the second small air inlet holes 102 are arranged at the conical part of the middle shell 4, and the second small air inlet holes 102 incline to the arrangement positions of the first small air inlet holes 101. The plurality of first air inlet small holes 101 are arranged in layers in the axial direction of the sleeve 1 and are arranged at intervals in the circumferential direction of the sleeve 1, the second air inlet small holes 102 are arranged at intervals in the circumferential direction around the axis of the middle shell 4, and the second air inlet small holes 102 are inclined towards the positions between the first air inlet small holes 101 of the adjacent layers. The gas at the inlet of the solenoid valve can pass through the armature 8 through the peripheral air passing hole 821 and the middle air passing hole 822 and then reach the middle part and the edge part of the valve seat 9, so that the stability of the armature 8 in the normal close and open states can be ensured, and the response timeliness of the armature 8 in the opening process can be ensured. Meanwhile, the peripheral air passing hole 821 and the middle air passing hole 822 on the armature 8 are of a plurality of small hole structures, the small hole structures can uniformly ventilate, the small holes are high in machining precision and good in consistency, and the basic premise that the flow is accurately controlled is provided.
Further, a third air inlet hole 103 for communicating the armature is arranged between the outer wall of the sleeve 1 at the position of the first air inlet small hole 101 and the inner wall of the middle shell 4 at the position of the second air inlet small hole 102. The outside of the second air inlet small hole 102 is provided with a filter screen 21, and the precision of the filter screen 21 is 3.5 mu m, so that the filter screen has a filtering function.
As shown in fig. 5-7, the annular protrusion 91 is disposed on the end face of the valve seat 9, the annular rubber pad 81 is disposed on the end face of the armature 8, and the smallest annular protrusion 91 corresponds to the middle of the annular surface of the annular rubber pad 81, so that when the armature 8 is normally closed, gas passing through the middle gas passing hole 822 can reach the lower side of the annular rubber pad 81, and the stability and reliability of the joint of the annular rubber pad 81 and the armature 8 are ensured; in addition, in the process that the armature 8 is separated from the valve seat 9, the gas reaching the lower side of the annular rubber pad 81 through the middle air passing hole 822 can play an auxiliary role, so that the armature 8 is favorably and quickly separated from the valve seat 9, the sticking is avoided, and the delay is shortened.
The vent hole 92 is opposite to the outer edge of the annular rubber pad 81, so that in the venting process after the armature 8 is separated from the valve seat 9, the air flow from the outer periphery and the outer peripheral air passing hole 821 of the armature 8 directly passes through the annular rubber pad 81 to enter the vent hole 92, and although the air flow from the middle air passing hole 822 in the middle of the armature 8 flows through the inner wall of the annular rubber pad 81, the air flow between the annular rubber pad 81 and the valve seat 9 can lift the annular rubber pad 81. The transition position of the top of the annular protrusion 91 and the inner and outer side walls is provided with a chamfer transition surface, so that the fitting precision of the armature 8 and the valve seat 9 is further enhanced, and the opening response speed of the armature 8 is improved.
Further, an adjusting pin 3 is arranged in the sleeve 1, and a step surface 17 for stopping the end of the adjusting pin 3 is arranged in the sleeve 1. The spring 16 is arranged between the adjusting pin 3 and the armature 8, and the pretightening force applied to the armature 8 by the spring 16 can be changed by changing the relative position of the adjusting pin 3 and the sleeve, so that the outlet flow of the armature 8 during action is adjusted. Armature 8 deviates from and is provided with mounting groove 83 on the terminal surface of disk seat 9, and the one end setting of spring 16 is in mounting groove 83, the other end insert in sleeve 1 and with the tip top connection of adjusting pin 3, and sleeve 1 deviates from the one end of armature 8 and is provided with and can dismantle and be connected with end cover 20, is convenient for adjust adjusting pin 3's position. The adjusting pin 3 is in tight fit or threaded fit with the sleeve 1, and the relative position of the adjusting pin 3 and the sleeve 1 can be conveniently changed by screwing or axially drawing the adjusting pin 3, so that the pre-tightening force of the spring 16 is changed.
More specifically, the annular protrusion 91 is provided with a first annular protrusion 911, a second annular protrusion 912, and a third annular protrusion 913 in order from smaller to larger in diameter, the vent hole 92 is provided between the first annular protrusion 911 and the second annular protrusion 912, and the third annular protrusion 913 is opposed to the outer peripheral portion of the armature 8. The height of the third annular bulge 913 is smaller than the heights of the first annular bulge 911 and the second annular bulge 912, the height difference is 0.03mm, deep indentation of the annular rubber gasket 81 caused by the first annular bulge 911 and the second annular bulge 912 under the pressure of the spring 16 can be avoided, the opening stroke is not influenced by the annular rubber gasket 81, and the stroke change cannot be caused, so that the flow accuracy and the response speed are not influenced. The peripheral air passing hole 821 is correspondingly arranged between the second annular bulge 912 and the third annular bulge 913, so that before the armature 8 is separated from the valve seat 9, air at the inlet of the valve body can reach the end face of the valve seat 9, and the response speed and reliability are further improved.
Further, the distance between the top of the third annular protrusion 913 and the end surface of the outer valve seat 9 is smaller than the distance between the top of the third annular protrusion 913 and the end surface of the inner valve seat 9. Such structural design can make valve seat 9 except that air vent 92 department, whole terminal surface can both directly with the gaseous contact that will circulate, can avoid valve seat 9 and armature 8 clearance undersize again and take place the adhesion.
The coil assembly 5 comprises a coil framework 51 sleeved outside the sleeve 1, an enameled wire 52 is wound on the coil framework 51, and the enameled wire 52 is hermetically arranged outside the sleeve 1 through a sealing structure matched with the end shell 18, the middle shell 4 and the air outlet joint 10 through the coil framework 51. The split structure design can reduce the adverse effect of the high temperature of the injection molding shape on the coil. Specifically, as shown in fig. 1, the sealing structure includes a first sealing ring 11, a second sealing ring 12, a third sealing ring 13, a fourth sealing ring 14, and a fifth sealing ring 15, which are respectively disposed between an outlet outer wall of the outlet joint 10 and an engine gas injection port, between the outlet joint 10 and the middle housing 4, between the coil frame 51 and the stop iron 2, between the middle housing 4 and the valve body mounting seat, and between the coil frame 51 and the middle housing 4.
Further, the adjusting pin 3 and the spring 16 are inserted from the adjusting end or the other end of the sleeve 1, and the spring 16 is separately installed between the armature 8 and the adjusting pin 3 or assembled with the installation groove 83 of the armature 8 and then installed with the armature 8 in synchronization.
As shown at B in fig. 1 and fig. 2, when the opening stroke of the armature 8 is adjusted, the opening stroke between the armature 8 and the end of the sleeve 1 or the mounting end face of the adjusting pad 6 is controlled by replacing the adjusting pad 6 with a different size or changing the assembling position between the valve seat 9, the outlet connector 10 and the intermediate housing 4, and then the outlet connector 10 is connected and fixed with the intermediate housing 4.
The opening stroke is adjusted independently of the ventilation flow rate, and when the ventilation flow rate is adjusted, as shown at C in fig. 1, the relative position of the adjustment pin 3 and the sleeve 1 is changed, and the compression force of the spring 16 is further changed to adjust the outlet flow rate when the armature 8 is operated.
Nothing in this specification is intended to be exhaustive of all conventional and well known techniques.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (13)
1. The utility model provides a miniature solenoid valve of low discharge, includes the valve body, its characterized in that: the valve body comprises a split end shell (18), a middle shell (4) and an air outlet joint (10), a magnetizable sleeve (1) is arranged in the valve body, a coil assembly (5) is arranged between the sleeve (1) and the valve body, an armature (8), the coil assembly (5) and a stop iron (2) are sequentially arranged on the sleeve (1), a magnetism isolating ring (7) is arranged on the periphery of the armature (8), a valve seat (9) is arranged at the lower end of the armature (8), a spring (16) for pressing the armature (8) on the valve seat (9) is arranged at the top of the armature (8), the middle shell (4) is connected and installed outside the coil assembly (5) and the stop iron (2), the first end of the middle shell (4) is connected with the end shell (18), the second end of the middle shell is connected with the air outlet joint (10), the armature (8) and the valve seat (9) are arranged between the middle shell (4) and the air outlet joint (10), the end shell (18), the middle shell (4) and the air outlet joint (10) are assembled and then arranged in the gas injection electromagnetic valve seat;
the valve seat (9) is in sealing fit with the armature (8) through at least two annular bulges (91) arranged at intervals and an annular rubber pad (81), the annular rubber pad (81) is in compression joint between the tops of the annular bulges (91), the peripheral space of the armature (8) is a ventilation space and/or an air passing hole (82) is formed in the armature (8), the air passing hole (82) is located on the outer side of the annular rubber pad (81) or/and the inner ring part of the annular rubber pad (81), and a ventilation hole (92) located between every two adjacent annular bulges (91) is formed in the valve seat (9);
the air passing holes (82) comprise a plurality of peripheral air passing holes (821) located on the outer side of the annular rubber pad (81) and/or a middle air passing hole (822) located around the inner wall of the annular rubber pad (81), the sleeve (1) is provided with a first air inlet small hole (101) communicating the middle air passing hole (822) with the outside of the sleeve (1), the periphery of the armature (8) is provided with a magnetic isolating ring (7) located in the middle shell (4), and the middle shell (4) is provided with a second air inlet small hole (102) communicated with the inside and the outside;
annular is protruding (91) and has set gradually first annular arch (911), second annular arch (912) and third annular arch (913) from little to big according to the diameter, air vent (92) set up between first annular arch (911), second annular arch (912), and third annular arch (913) are relative with the outer fringe portion of armature (8), the gas hole (821) are crossed to the periphery corresponds and sets up between second annular arch (912) and third annular arch (913), and the height of third annular arch (913) is less than the height of first annular arch (911) and second annular arch (912).
2. The small flow micro solenoid valve according to claim 1, wherein: the first air inlet small holes (101) and the second air inlet small holes (102) are respectively provided with a plurality of air inlet small holes, the second air inlet small holes (102) are arranged at the conical part of the middle shell (4), and the second air inlet small holes (102) are inclined towards the arrangement positions of the first air inlet small holes (101).
3. The small-flow micro solenoid valve according to claim 1 or 2, wherein: the plurality of first air inlet small holes (101) are arranged in the axial direction of the sleeve (1) in a layered mode and are arranged at intervals in the circumferential direction of the sleeve (1), the second air inlet small holes (102) are arranged at intervals in the circumferential direction around the axis of the middle shell (4), and the second air inlet small holes (102) incline to face to the positions between the first air inlet small holes (101) of the adjacent layers.
4. The small flow micro solenoid valve according to claim 3, wherein: and a third air inlet hole (103) communicated with the armature is formed between the outer wall of the sleeve (1) at the position where the first air inlet small hole (101) is arranged and the inner wall of the middle shell (4) at the position where the second air inlet small hole (102) is arranged.
5. The small flow micro solenoid valve according to claim 4, wherein: a filter screen (21) is arranged outside the second air inlet small holes (102), and the precision of the filter screen (21) is 3.5 mu m.
6. The small flow rate micro solenoid valve according to any one of claims 1, 2, 4, and 5, wherein: the annular bulge (91) is arranged on the end face of the valve seat (9), the annular rubber pad (81) is arranged on the end face of the armature (8), the smallest annular bulge (91) corresponds to the middle of the ring face of the annular rubber pad (81), and the vent hole (92) is opposite to the outer edge of the annular rubber pad (81).
7. The small flow micro solenoid valve according to claim 6, wherein: be provided with adjusting pin (3) in sleeve (1), spring (16) set up between adjusting pin (3) and armature (8), are provided with mounting groove (83) on the terminal surface that armature (8) deviate from disk seat (9), and the one end setting of spring (16) is in mounting groove (83), the other end insert in sleeve (1) and with the tip butt of adjusting pin (3), and the one end that sleeve (1) deviates from armature (8) is provided with can dismantle and is connected with end cover (20).
8. The small flow micro solenoid valve according to claim 7, wherein: the adjusting pin (3) and the spring (16) are arranged at the adjusting end of the sleeve (1) or inserted into the other end of the sleeve, and the spring (16) is independently arranged between the armature (8) and the adjusting pin (3) or is assembled with the mounting groove (83) of the armature (8) and then is synchronously arranged with the armature (8).
9. The small flow rate micro solenoid valve according to any one of claims 1, 2, 4, 5, 7, and 8, wherein: the coil component (5) comprises a coil framework (51) sleeved outside the sleeve (1), an enameled wire (52) is wound on the coil framework (51), the enameled wire (52) is hermetically arranged outside the sleeve (1) through a sealing structure which is matched with the end part shell (18), the middle shell (4) and the air outlet joint (10) through the coil framework (51), the sealing structure comprises a first sealing ring (11), a second sealing ring (12), a third sealing ring (13), a fourth sealing ring (14) and a fifth sealing ring (15) which are respectively arranged between the outlet outer wall of the gas outlet joint (10) and the fuel gas injection port of the engine, between the gas outlet joint (10) and the middle shell (4), between the coil framework (51) and the stop iron (2), between the middle shell (4) and the valve body mounting seat, and between the coil framework (51) and the middle shell (4).
10. The small flow micro solenoid valve according to claim 9, wherein: an adjusting pad (6) for adjusting the opening of the armature (8) is arranged between the magnetism isolating ring (7) and the middle shell (4) in the axial direction, and the inner diameter of the adjusting pad (6) and the inner diameter of the magnetism isolating ring (7) are both larger than the outer diameter of the armature (8).
11. The assembly adjustment method of a small-flow micro electromagnetic valve according to any one of claims 1 to 10, characterized in that: the end part shell (18) is molded and injected outside the sleeve (1), the stop iron (2) is installed outside the sleeve (1) before or after the end part shell (18) is molded and injected, then the coil assembly (5) is installed on the sleeve (1), the middle shell (4) is clamped and fixed with the end part shell (18), the second end of the middle shell (4) is provided with the adjusting pad (6), the magnetism isolating ring (7), the armature (8) and the valve seat (9), and the middle shell (4) outside the valve seat (9) is connected with the air outlet joint (10).
12. The assembly adjustment method of a small-flow micro solenoid valve according to claim 11, wherein: when the opening stroke of the armature (8) is adjusted, the adjusting pad (6) with different sizes is replaced or the assembling positions among the valve seat (9), the air outlet joint (10) and the middle shell (4) are changed to control the opening stroke between the armature (8) and the end part of the sleeve (1) or the mounting end face of the adjusting pad (6), and then the air outlet joint (10) and the middle shell (4) are connected and fixed.
13. The assembly adjustment method of a small-flow micro electromagnetic valve according to claim 12, characterized in that: the opening stroke and the ventilation flow are relatively independently adjusted, and when the ventilation flow is adjusted, the relative position of the adjusting pin (3) and the sleeve (1) is changed, so that the compression force of the spring (16) is changed to adjust the outlet flow when the armature (8) acts.
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| CN202110501236.3A CN113202658B (en) | 2021-05-08 | 2021-05-08 | Small-flow miniature electromagnetic valve and assembly adjusting method thereof |
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| CN202110501236.3A CN113202658B (en) | 2021-05-08 | 2021-05-08 | Small-flow miniature electromagnetic valve and assembly adjusting method thereof |
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| CN114233528B (en) * | 2021-12-01 | 2024-01-05 | 漫索(苏州)控制系统有限公司 | Gas nozzle |
| CN115306600B (en) * | 2022-08-18 | 2023-12-29 | 一汽解放汽车有限公司 | Gas injection valve and car |
| CN117212015A (en) * | 2023-10-11 | 2023-12-12 | 一汽解放汽车有限公司 | Gas injection valve and engine |
| AT526643A3 (en) * | 2023-11-21 | 2024-07-15 | Hoerbiger Wien Gmbh | Injection valve |
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