CN115234407B - Stop valve and gas injector - Google Patents
Stop valve and gas injector Download PDFInfo
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- CN115234407B CN115234407B CN202210861817.2A CN202210861817A CN115234407B CN 115234407 B CN115234407 B CN 115234407B CN 202210861817 A CN202210861817 A CN 202210861817A CN 115234407 B CN115234407 B CN 115234407B
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- valve
- valve rod
- elastic
- shut
- rod
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- 230000004044 response Effects 0.000 claims abstract description 4
- 238000007789 sealing Methods 0.000 claims description 50
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 9
- 238000005381 potential energy Methods 0.000 claims description 8
- 238000010276 construction Methods 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 238000012545 processing Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 21
- 239000000446 fuel Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 9
- 238000002347 injection Methods 0.000 description 9
- 239000007924 injection Substances 0.000 description 9
- 230000005489 elastic deformation Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000001257 hydrogen Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 230000004308 accommodation Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 229920006351 engineering plastic Polymers 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000003915 liquefied petroleum gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 239000004636 vulcanized rubber Substances 0.000 description 1
Classifications
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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
- 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
- F02M21/026—Lift valves, i.e. stem operated valves
- F02M21/0263—Inwardly opening single or multi nozzle valves, e.g. needle valves
-
- 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
Abstract
The invention relates to a stop valve and a gas injector, comprising a valve seat, a valve rod and an abutting piece. The valve seat has a first opening, a receiving chamber, and a second opening that communicate in sequence in a first direction. A valve stem extends at least partially from the first opening into the receiving chamber, the valve stem being configured to have a predetermined spring force. The abutting piece is arranged on the cavity wall of one end, close to the second opening, in the accommodating cavity. Wherein the valve rod is configured to be capable of reciprocating in a first direction within the accommodating chamber in response to an external force, and the valve rod is capable of abutting against the abutting piece by means of a preset elastic force to seal the valve seat in the reciprocating motion. In this application, the valve rod has and presets elasticity, and it can be with the help of preseting elasticity when reciprocating motion is done along the first direction in the disk seat, according to the actual fitting surface when contact between valve rod and the disk seat, offset with holding the butt piece in the intracavity adaptively, adjusts the contact gesture between valve rod and the disk seat to make the sealed contact atress more even, sealed more effective, reduced the demand of processing and assembly.
Description
Technical Field
The invention relates to the technical field of stop valves, in particular to a stop valve and a gas injector.
Background
Gas injectors are key actuators in gas engine fuel gas supply systems and are widely used in hydrogen internal combustion engines. Direct injection injectors of gas injectors require that gaseous fuel be injected directly into the combustion chamber during injection and remain reliably closed during non-injection. However, the current gas injector has poor sealing effect, and the use requirement of sealing reliability is difficult to achieve.
Disclosure of Invention
Based on this, it is necessary to provide a shut-off valve and a gas injector capable of improving the sealing effect to meet the use requirement of sealing reliability.
In one aspect of the present application, there is provided a shut-off valve comprising:
the valve seat is provided with a first opening, a containing cavity and a second opening which are communicated in sequence along a first direction;
a valve stem extending at least partially from the first opening into the receiving cavity; the valve rod is configured to have a preset elastic force; and
the abutting piece is arranged on the cavity wall of one end, close to the second opening, of the accommodating cavity;
wherein the valve stem is configured to reciprocate within the receiving cavity in a first direction in response to an external force;
the valve rod can be abutted against the abutting piece by means of preset elastic force to seal the valve seat in the reciprocating motion.
In one of the embodiments, the valve stem has a separated state in which the valve stem is separated from the abutment in the reciprocating motion;
the valve stem can also store elastic potential energy by means of a preset elastic force to switch to the detached state.
In one embodiment, the valve stem comprises a stem body and a first elastic member connected to the stem body;
the first elastic piece is used for providing preset elastic force for the valve rod.
In one embodiment, the rod body and the first elastic element are of an integral structure; or alternatively
The rod body and the first elastic piece are of a split type structure.
In one embodiment, the valve stem includes a body portion and a resilient portion disposed on the body portion;
the elastic part is used for providing preset elastic force for the valve rod.
In one embodiment, the valve stem includes a first region, a second region, and a third region connected in sequence;
the elastic part is positioned in the first area; or the elastic part is positioned in the second area; or the elastic part is positioned in the third area;
the first area is located at one end of the valve rod, which is close to the first opening, and the third area is located at one end of the valve rod, which is close to the second opening.
In one embodiment, the shut-off valve further comprises a seal;
the sealing element is connected with one end of the valve rod, which faces the abutting element;
when the valve rod is in the sealing position, the sealing element can be in sealing abutment with the abutting element.
In one embodiment, the seal comprises a resilient seal.
In one embodiment, the shut-off valve further comprises a connecting seat;
the connecting seat is connected with one end of the valve rod, which faces the abutting piece;
wherein, the connecting groove has been seted up towards one side of butt spare to the connecting seat, and the sealing member is installed in the connecting groove.
In one embodiment, the shut-off valve further comprises an air inlet fitting;
the air inlet joint is arranged at one end of the valve body, which is close to the first opening, and is provided with an air inlet channel which is communicated with the accommodating cavity and the external space.
In one embodiment, the shut-off valve further comprises a second resilient member;
the second elastic piece is preloaded between the air inlet joint and the valve rod.
In one embodiment, the shut-off valve further comprises a stator core, a solenoid coil, and an armature;
the fixed iron core is arranged at one end, close to the first opening, in the accommodating cavity and is connected with the cavity wall of the accommodating cavity;
the electromagnetic coil is connected with the cavity wall of the accommodating cavity;
the armature is arranged at one end of the rod body, which faces the fixed iron core;
when the electromagnetic coil is electrified, the electromagnetic coil can drive the armature to move towards the fixed iron core, and when the electromagnetic coil is deenergized, the elastic force of the second elastic piece drives the valve rod to move towards the abutting piece to be in sealing contact with the abutting piece.
In another aspect of the present application, a gas injector is provided, including the shut-off valve described above.
According to the stop valve and the gas injector, the valve rod has the preset elastic force, when the valve rod reciprocates in the valve seat along the first direction, the valve rod can be propped against the abutting piece in the accommodating cavity adaptively according to the actual matching surface when the valve rod contacts the valve seat by means of the preset elastic force, and the contact gesture between the valve rod and the valve seat is adjusted, so that the sealing contact stress is more uniform, the requirements of processing and assembly are reduced, and the sealing reliability is improved.
Drawings
FIG. 1 is a schematic diagram of a shut-off valve according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of a valve stem according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a stop valve according to another embodiment of the present invention.
Reference numerals illustrate:
100. a stop valve; 10. a valve seat; 11. a first opening; 12. a receiving chamber; 13. a second opening; A. a first surface; 20. a valve stem; 21. a body portion; 211. a first zone; 212. a second zone; 213. a third zone; 21a, a rod body; 22. an elastic part; 22b, a first elastic member; B. a second surface; 30. an abutment; 31 connecting channels; 40. a seal; 50. a connecting seat; 51. a connection groove; 60. an air inlet joint; 61. an air intake passage; 70. a second elastic member; 80. fixing an iron core; 90. an electromagnetic coil.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Further, the drawings are not 1:1, and the relative dimensions of the various elements are drawn by way of example only in the drawings and are not necessarily drawn to true scale.
For convenience of description, the drawings show only structures related to the embodiments of the present invention.
The inventor of the present application found through research that the valve rod and the valve seat in the related art may have problems of perpendicularity, parallelism and the like in the process of manufacturing and assembling, and when the valve rod and the valve seat are sealed against each other, contradiction is more prominent when the valve rod and the valve seat are matched, so that the sealing effect is poor.
FIG. 1 shows a schematic diagram of a shut-off valve 100 in an embodiment of the invention; fig. 2 shows a schematic structural view of a valve stem 20 in an embodiment of the present invention.
As shown in fig. 1 and 2, according to an embodiment of the present invention, a shut-off valve 100 includes a valve seat 10, a valve stem 20, and an abutment 30. The valve seat 10 has a first opening 11, a receiving chamber 12, and a second opening 13 that communicate in this order in a first direction. The valve stem 20 protrudes at least partially from the first opening 11 into the receiving chamber 12, and the valve stem 20 is configured to have a predetermined elastic force. The abutment 30 is provided in the cavity wall of the receiving cavity 12 at an end near the second opening 13. Wherein the valve stem 20 is configured to be capable of reciprocating in a first direction within the receiving chamber 12 in response to an external force, and the valve stem 20 is capable of abutting against the abutment 30 by a preset elastic force to seal the valve seat 10 in the reciprocating motion.
According to the stop valve 100, when the valve rod 20 reciprocates along the first direction in the valve seat 10, the valve rod 20 can be abutted against the abutting piece 30 in the accommodating cavity 12 adaptively according to the actual matching surface when the valve rod 20 contacts with the valve seat 10 by means of the preset elastic force, and the contact gesture between the valve rod 20 and the valve seat 10 is adjusted, so that the sealing contact stress is more uniform, the processing and assembling requirements are reduced, and the sealing reliability is improved.
The valve seat 10 has a first surface a, and the valve stem 20 has a second surface B, and when the valve stem 20 moves to abut against the abutment 30, the first surface a and the second surface B can seal against each other to seal the shutoff valve 100. Wherein the first direction is the x-axis direction as shown in fig. 1.
With continued reference to fig. 1, in some embodiments, the valve stem 20 has a separated state in which the valve stem 20 is separated from the abutment 30 in the reciprocating motion, and the valve stem 20 is further capable of storing elastic potential energy by means of a preset elastic force to switch to the separated state. When the stop valve 100 is applied to a gas injector as described below, when the end of the valve rod 20 near the first opening 11 is pulled, the valve rod 20 stores elastic potential energy by means of preset elastic force until the elastic force overcomes the gas pressure, so that the valve rod 20 is quickly sprung up, the initial speed of the stop valve 100 when opened is increased, the maximum lift can be reached more quickly, and the injection rule of fuel is more full and the circulation efficiency is higher.
Fig. 3 shows a schematic structure of a shut-off valve 100 according to another embodiment of the present invention.
Referring to fig. 3, in some embodiments, the valve stem 20 includes a stem 21a and a first resilient member 22b coupled to the stem 21 a. The first elastic member 22b is used to provide a predetermined elastic force to the valve stem 20. Thus, in connection with the foregoing embodiment, it will be appreciated that when the valve stem 20 is pulled, the end of the first elastic member 22b connected to the stem 21a is stretched to elastically deform, while the elastic potential energy is accumulated, and the end of the first elastic member 22b connected to the sealing assembly is not actuated until the elastic force of the first elastic member 22b overcomes the gas pressure and cooperates with the elastic force converted from the elastic potential energy, so that the flow passage is opened to enable fuel injection.
Stiffness is the proportional coefficient of part load proportional to displacement, i.e., the force required to cause a unit displacement. The inventor has found that if the stiffness range of the first elastic member 22b is smaller than 50N/mm, the amount of elastic deformation that occurs is too large, the bearable stress is too small to accommodate the stress requirement of the valve stem 20, and if the stiffness range of the first elastic member 22b is larger than 1000N/mm, the stiffness is too large, and the amount of elastic deformation that occurs is too small, so that it is difficult to buffer the stress by deformation of the first elastic member 22b.
Thus, with continued reference to FIG. 3, in some embodiments, the first resilient member 22b has a stiffness in the range of 50N/mm to 1000N/mm. It is understood that the stiffness range of the first elastic member 22b may be, but is not limited to, 50N/mm, 100N/mm, 150N/mm, 200N/mm, 250N/mm, 300N/mm, 350N/mm, 400N/mm, 450N/mm, 500N/mm, 550N/mm, 600N/mm, 650N/mm, 700N/mm, 750N/mm, 800N/mm, 850N/mm, 900N/mm, 950N/mm, or 1000N/mm.
The inventors have found that, in combination with the actual stress of the valve stem 20, if the elastic deformation amount of the first elastic member 22b is greater than 0.5mm, it is difficult to buffer the stress in the limited space of the valve seat 10. In still other embodiments, the amount of elastic deformation of the first elastic member 22b ranges from 0mm to 0.5mm. It is understood that the elastic deformation amount of the first elastic member 22b may be, but is not limited to, 0mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, or 0.5mm.
Alternatively, the first elastic member 22b may be a cylindrical spring, a barrel spring, rubber, a belleville spring or other elastic member, without limitation.
In some embodiments, the rod 21a and the first elastic member 22b are integrally formed. Thus, the rod 21a and the first elastic member 22b are fixedly connected with each other more stably, so that the rod 21a is easy to realize stress conduction. The rod 21a and the first elastic member 22b having an integral structure do not have a compressive or tensile preload when the valve stem 20 is in a stationary state or a uniform motion state in the valve seat 10, and thus do not hinder the stress applied to the rod 21 a. When applied to the stop valve 100 and the gas injector described below, the valve rod 20 does not increase the requirement for electromagnetic force, but rather, the valve rod 20 can compress the first elastic member 22b when receiving electromagnetic force, thereby reducing the electromagnetic air gap and reducing the electromagnetic design requirement. Of course, in some embodiments, the rod 21a and the first elastic member 22b may be a split structure, which is not limited herein.
Referring to fig. 1 and 2 again, in some embodiments, the valve rod 20 includes a body 21 and an elastic portion 22 disposed on the body 21, and the elastic portion 22 is configured to provide a predetermined elastic force to the valve rod 20. In this way, the body portion 21 and the elastic portion 22 can more easily conduct stress, and the rod body 21a and the first elastic member 22b which are matched with each other do not need to be selected, so that the manufacturing process can be simplified, and the cost can be reduced. Further, the valve stem 20 includes a first region 211, a second region 212, and a third region 213, which are sequentially connected. The elastic portion 22 is located in the first region 211. Or the elastic portion 22 is located in the second region 212. Or the elastic portion 22 is located in the third region 213. Wherein the first zone 211 is located at an end of the valve stem 20 adjacent to the first opening 11 and the third zone 213 is located at an end of the valve stem 20 adjacent to the second opening 13. It is to be understood that the elastic portion 22 can be formed at any portion of the valve stem 20 without limitation by the valve stem 20 formed by the elastic portion 22 and the body portion 21. That is, the elastic portion 22 can adaptively adjust its position according to actual requirements, so as to improve the adaptability of the valve stem 20 under different requirements. In particular to the embodiment shown in fig. 1 and 2, the elastic portion 22 is located in the third zone 213.
In some embodiments, as shown in fig. 1, shut-off valve 100 further includes a seal 40. The seal 40 is connected to an end of the valve stem 20 facing the abutment 30. When the valve stem 20 is in the sealing position, the seal 40 is able to seal against the abutment 30. In this way, by providing the seal 40, the sealing effect between the valve stem 20 and the abutment 30 can be further improved, and the sealing effect of the shutoff valve 100 can be further improved.
It should be noted that, in combination with the first elastic member 22b in the foregoing embodiments or the elastic portion 22 in the foregoing other embodiments, the valve rod 20 having the predetermined elastic force can buffer the impact load between the sealing member 40 and the abutting member 30 when the rod 21a is stressed, so as to avoid damaging the sealing member 40, further avoid damaging the sealing member 40, and prolong the service lives of the sealing member 40 and the abutting member 30. Specifically, the abutment 30 has a connection passage 31 and third and fourth openings communicating with the connection passage 31, the connection passage 31 being for communicating with the accommodation chamber 12 and the external space, and an orthographic projection of the seal 40 in the first direction covers an orthographic projection of the third and fourth openings in the first direction. In this way, a reliable seal of the seal 40 can be ensured.
Alternatively, the abutment 30 and the cavity wall of the receiving cavity 12 may be fixedly connected, but not limited to, by a threaded connection, a welded or interference fit, or the like. The material of the sealing member 40 may be, but not limited to, engineering plastic or vulcanized rubber. The material of the abutment 30 may be, but is not limited to, metal or engineering plastic. The abutment 30 may be a stepped portion protruding from the wall of the accommodating chamber 12, and is not limited to this, as long as it can be used to seal against the seal 40.
Further, the seal 40 comprises an elastomeric seal. In this way, the seal 40 is provided as an elastic seal, and when the seal 40 seals against the abutment 30, the seal 40 can elastically deform to adapt to the sealing surface against the abutment 30, thereby improving the sealing effect between the seal 40 and the abutment 30. In addition, when the elastic sealing member receives an impact load from the rod body 21a, the elastic sealing member can be elastically deformed to further buffer the impact force, so that damage caused by overlarge impact force to the abutting member 30 is avoided, and even sealing failure is caused.
With continued reference to fig. 1 and 2, in some embodiments, the shut-off valve 100 further includes a connecting seat 50. The connecting seat 50 is connected to an end of the valve stem 20 facing the abutment 30. The connecting seat 50 is provided with a connecting groove 51 on a side facing the abutting piece 30, and the sealing piece 40 is mounted on the connecting groove 51. In this way, the installation space for the sealing member 40 can be provided by the connection groove 51, and the sealing member 40 can be more reliably fixed, so that the sealing failure caused by the separation of the sealing member 40 can be avoided. In particular, in the embodiment shown in fig. 2, the connecting seat 50 is integrally formed with the valve stem 20. In the embodiment shown in fig. 3, for example, the connection seat 50 and the valve stem 20 may be a separate structure, which is not limited herein.
In some embodiments, as shown in fig. 1, shut-off valve 100 further includes an air intake fitting 60. The air intake joint 60 is mounted to an end of the valve seat 10 near the first opening 11, and the air intake joint 60 has an air intake passage 61, the air intake passage 61 communicating with the accommodation chamber 12 and the external space. In this way, the shut-off valve 100 can be reliably connected to the external cylinder by the intake joint 60. In particular, in some embodiments, the air inlet fitting 60 is used to introduce external fuel into the receiving cavity 12. In this way, the injection and metering of fuel can be performed by the shutoff valve 100.
Further, the air intake joint 60 has a threaded portion at least in part. The threaded portion is for connection to an external device. In this way, the screw portion ensures that the air intake joint 60 is reliably connected to an external device, and fuel in the external device is introduced into the air intake passage 61, thereby achieving air supply to the shutoff valve 100. In other embodiments, the air inlet fitting 60 is coated with a non-metallic or soft material for sealing connection with an external device. The external fuel may be, but not limited to, a high-pressure gas such as natural gas, hydrogen, liquefied petroleum gas, or the like, or may be a liquid medium, and is not limited thereto. In embodiments of the present application, the external fuel may be high pressure hydrogen.
With continued reference to FIG. 1, in some embodiments, the shut-off valve 100 further includes a second resilient member 70. The second elastic member 70 is preloaded between the air intake joint 60 and the valve stem 20. In this way, the second elastic member 70 can provide a restoring force for returning the valve rod 20 and also can provide a pre-tightening force for closing the shut-off valve 100, thereby ensuring that the valve rod 20 can reliably seal the valve seat 10.
In some embodiments, as shown in fig. 1, the shut-off valve 100 further includes a stator core 80, a solenoid 90, and an armature. The fixed iron core 80 is disposed in the accommodating cavity 12 near one end of the first opening 11 and is connected to the cavity wall of the accommodating cavity 12, and the electromagnetic coil 90 is connected to the cavity wall of the accommodating cavity 12. The armature is provided at one end of the rod body 21a facing the fixed core 80. When the electromagnetic coil 90 is energized, the electromagnetic coil 90 can drive the armature to move towards the fixed iron core 80, and when the electromagnetic coil 90 is de-energized, the elastic force of the second elastic member 70 drives the valve rod 20 to move towards the abutting member 30 to be in sealing abutment with the abutting member 30. In this way, the electromagnetic cut-off valve 100 can be matched with different circuits to realize the expected control, and the control precision and flexibility can be ensured. Further, the armature is of unitary construction with the stem 21 a. In this way, space can be saved and the manufacturing process can be simplified. Of course, in other embodiments, the armature and the rod 21a may be formed as a separate structure, and the present invention is not limited thereto.
When the electromagnetic coil 90 is energized, the electromagnet generates a suction force, the armature drives the rod 21a to move away from the abutment 30 under the action of the electromagnetic force, and the end of the first elastic member 22 b/elastic portion 22 facing the abutment 30 is temporarily not actuated due to the pressure of the gas, so that the rod 21a stretches the first elastic member 22 b/elastic portion 22 and the first elastic member 22 b/elastic portion 22 accumulates elastic potential energy. At this stage, the electromagnetic force increases with the movement of the rod 21a, and the tensile force generated by the first elastic member 22 b/the elastic portion 22 overcomes the gas pressure, and the connecting seat 50 and the rod 21a are sprung up to open the flow channel, so as to realize fuel injection. When the electromagnetic coil 90 is powered off, the attraction force of the electromagnet disappears, and the valve rod 20 moves towards the abutting piece 30 under the action of the elastic force of the second elastic piece 70 until the sealing piece 40 is in sealing abutting with the abutting piece 30. In combination with the foregoing embodiments, when the sealing member 40 seals against the abutment member 30, the sealing engagement surface can be adaptively adjusted by means of a predetermined elastic force, so as to avoid the failure of the seal between the valve stem 20 and the valve seat 10 due to the deviation of parallelism.
In particular to some embodiments, the stationary core 80 and the cavity wall of the receiving cavity 12 may be, but are not limited to, an interference fit, a welded fit, a threaded fit. In this way, the fixed core 80 and the valve seat 10 can be secured reliably, thereby achieving axial positioning.
In other embodiments, the stop valve 100 may be a piezoelectric stop valve, or may be another form of stop valve 100, which is not limited herein.
In yet another aspect of the present application, there is also provided a gas injector including the above-described shut-off valve 100. Thus, by using the above-described shut-off valve 100, not only is the sealing effect better, but also the valve seat 10 can be made to shut off more gently, extending the service life of the seal 40 and the abutment 30 in the gas injector. In addition, by using the stop valve 100, the initial electromagnetic force can be reduced, the initial opening speed of the valve seat 10 can be increased, and the maximum lift can be reached more quickly, so that the injection law is more filled and the circulation efficiency is higher. Alternatively, the gas injector is applied to a hydrogen engine. Of course, in other embodiments, the present invention can be applied to other devices according to actual needs, and is not limited herein.
According to the stop valve 100 and the gas injector, the sealing contact gesture between the valve rod 20 and the valve seat 10 can be adjusted through the valve rod 20 with the preset elastic force, so that the sealing effect is improved, and the precision requirement in production and manufacturing is reduced. In addition, the opening speed of the stop valve 100 can be increased by the accumulated elastic potential energy, and the opening speed of the stop valve 100 is increased, so that the fuel injection rule is full, and the fuel circulation efficiency is high. The first elastic member 22 b/elastic portion 22 can buffer stress when the shut-off valve 100 is closed, thereby avoiding damage to the seal 40 and the abutment 30 for sealing due to excessive impact force. The elastic seal not only improves the sealing effect, but also can elastically deform to buffer stress when receiving an impact load from the valve rod 20, further prolonging the service lives of the seal 40 and the abutment 30. And the gas injector using the shut-off valve 100 improves its working efficiency and prolongs its service life.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. A shut-off valve, comprising:
a valve seat having a first opening, a receiving chamber, and a second opening that are sequentially communicated in a first direction;
a valve stem extending at least partially from the first opening into the receiving cavity; the valve rod is configured to have a preset elastic force; and
the abutting piece is arranged on the cavity wall of one end, close to the second opening, of the accommodating cavity;
wherein the valve stem is configured to reciprocate within the receiving cavity in the first direction in response to an external force;
the valve rod can be abutted against the abutting piece by means of the preset elastic force in reciprocating motion so as to seal the valve seat; the valve rod has a separated state in which the valve rod is separated from the abutment in the reciprocating motion; the valve rod can also store elastic potential energy by means of the preset elastic force to switch to the separation state;
the valve rod comprises a rod body and a first elastic piece which is sequentially connected with the rod body along the first direction, and the first elastic piece is used for providing the preset elastic force for the valve rod; or,
the valve rod comprises a body part and an elastic part arranged on the body part along the first direction, wherein the elastic part is used for providing the preset elastic force for the valve rod; the valve rod comprises a first area, a second area and a third area which are sequentially connected; the elastic part is positioned in the first area; or the elastic part is positioned in the second area; or the elastic part is positioned in the third area.
2. The shut-off valve of claim 1 wherein the stem body is of unitary construction with the first resilient member; or alternatively
The rod body and the first elastic piece are of a split type structure.
3. The shut-off valve of claim 1 wherein the first zone is located at an end of the valve stem adjacent the first opening and the third zone is located at an end of the valve stem adjacent the second opening.
4. The shut-off valve of claim 1, wherein the shut-off valve further comprises a seal;
the sealing element is connected with one end of the valve rod, which faces the abutting element;
the seal is capable of sealing against the abutment when the valve stem is in the sealing position.
5. The shut-off valve of claim 4 wherein the seal comprises an elastomeric seal.
6. The shut-off valve of claim 4, further comprising a connecting seat;
the connecting seat is connected with one end of the valve rod, which faces the abutting piece;
the connecting seat is provided with a connecting groove towards one side of the abutting piece, and the sealing piece is arranged in the connecting groove.
7. The shut-off valve of claim 1 further comprising an air inlet fitting;
the air inlet connector is arranged at one end, close to the first opening, of the valve rod, and is provided with an air inlet channel, and the air inlet channel is communicated between the accommodating cavity and the external space.
8. The shut-off valve of claim 7 further comprising a second resilient member;
the second elastic piece is preloaded between the air inlet joint and the valve rod.
9. The shut-off valve of claim 8 further comprising a stator core, a solenoid coil, and an armature;
the fixed iron core is arranged at one end, close to the first opening, in the accommodating cavity and is connected with the cavity wall of the accommodating cavity;
the electromagnetic coil is connected with the cavity wall of the accommodating cavity;
the armature is arranged at one end of the rod body, which faces the fixed iron core;
wherein, when the electromagnetic coil is electrified, the electromagnetic coil can drive the armature to move towards the fixed iron core; when the electromagnetic coil is powered off, the elastic force of the second elastic piece drives the valve rod to move towards the abutting piece to be in sealing abutment with the abutting piece.
10. A gas injector comprising a shut-off valve according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210861817.2A CN115234407B (en) | 2022-07-22 | 2022-07-22 | Stop valve and gas injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210861817.2A CN115234407B (en) | 2022-07-22 | 2022-07-22 | Stop valve and gas injector |
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| Publication Number | Publication Date |
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| CN115234407A CN115234407A (en) | 2022-10-25 |
| CN115234407B true CN115234407B (en) | 2024-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210861817.2A Active CN115234407B (en) | 2022-07-22 | 2022-07-22 | Stop valve and gas injector |
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| CN (1) | CN115234407B (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN115234407A (en) | 2022-10-25 |
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