Methanol injector structure

Abstract

The present invention relates to a methanol fuel injector structure, comprising: a housing, a valve core, a retainer and a valve seat, wherein the housing defines a fuel flow channel, the valve seat is arranged at the bottom end of the housing, a guide hole is arranged in the middle of the retainer, the retainer is arranged in the flow channel, the outer wall of the valve core and the guide hole are slidably matched to separate the flow channel into a first channel and a second channel close to the valve seat, the second channel is used to pass methanol, and the first channel is used to pass compressed gas with the same pressure as methanol. The above-mentioned methanol fuel injector structure, through the valve core and the guide hole of the retainer, when the methanol injector is working, the valve core moves up and down with the excitation signal, the guide hole plays an accurate guiding role, due to the effect of pressure, methanol forms a thin film in the gap, the air pressure in the first channel is the same as the pressure of methanol, methanol cannot enter the first channel, thereby avoiding methanol entering the valve core to gradually form a colloid and cause the valve core to fail.

Description

Technical Field

[0001] The invention relates to the technical field of fuel injectors, in particular to a methanol fuel injector structure suitable for a common rail electronically controlled gasoline engine to use methanol fuel. Background Art

[0002] Since the cost of methanol is much lower than that of gasoline, methanol vehicles came into being. As the name implies, methanol vehicles use methanol as vehicle fuel. The raw materials for methanol refining are usually natural gas, low-quality coal, etc., and methanol fuel is easily contaminated and reacts with other media to produce sediments. Therefore, the quality of methanol fuel currently varies greatly, and there are more impurities in methanol than in gasoline. Methanol injectors are actuators that directly contact methanol fuel. Due to long-term use of methanol, the sediment in methanol will increase the resistance to the movement of the valve core, and finally reduce the movement distance of the valve core, reduce the flow of the injector nozzle, or even clog it, which will lead to occasional engine misfires.

[0003] A large number of methanol vehicles have been put into use in some parts of the country. The existing electronically controlled gasoline injector structure is used to directly modify the injection flow for electronically controlled methanol injection. Due to the harsh working environment of the methanol injector, the injector is more easily damaged, resulting in a significant increase in the cost of use. Summary of the invention

[0004] Based on this, it is necessary to provide a methanol injector structure to address the deficiencies of the prior art, which has a fast response to an electrical excitation signal and can adapt to long-term operation in an environment where methanol is used as a fuel.

[0005] A methanol injector structure comprises: a shell, a valve core, a retainer and a valve seat, wherein the shell defines a flow channel for fuel, the valve seat is arranged at the bottom end of the shell, a guide hole is provided in the middle position of the retainer, the retainer is arranged in the flow channel, the outer side wall of the valve core and the guide hole are slidably matched to separate the flow channel into a first channel and a second channel close to the valve seat, the upper part of the first channel is sealed to form a gas pressure chamber, the second channel is used to pass methanol, and the first channel is used to pass compressed gas with the same pressure as methanol.

[0006] In one of the embodiments, a control assembly is further included, wherein the control assembly is used to control the axial movement of the valve core between an open position and a closed position.

[0007] In one of the embodiments, it is characterized in that a compressed gas pipe joint and a methanol pipe joint are provided on the shell, and the compressed gas pipe joint and the methanol pipe joint are located on the same side and are arranged in parallel.

[0008] In one embodiment, the outer side of the shell extends to form a connecting socket, a coil is provided between the first channel and the shell, and a conductive terminal connected to the coil is provided on the connecting socket.

[0009] In one embodiment, the valve core includes a first shaft segment, a second shaft segment and a steel ball, the first shaft segment is connected to the second shaft segment, the steel ball is arranged at the front end of the second shaft segment, the outer wall of the first shaft segment is movably connected to the inner wall of the flow channel, and the outer surface of the second shaft segment is gap-matched with the guide hole so that the steel ball is always automatically centered with the valve seat without over-positioning.

[0010] In one embodiment, the width of the second shaft segment is smaller than the width of the first shaft segment.

[0011] In one embodiment, a first valve cavity and a second valve cavity connected to the first valve cavity are provided in the center of the first shaft segment from top to bottom, the first valve cavity is connected to the first channel, the second valve cavity is at least partially located in the second shaft segment, and a valve hole connected to the second valve cavity is provided on the side wall of the second shaft segment, and the valve hole is used to pass compressed gas with the same pressure as methanol.

[0012] In one of the embodiments, the valve seat includes a accommodating cavity and a nozzle hole, the front end of the valve core extends from the guide hole to the accommodating cavity, and the outer diameter of the steel ball matches the inner diameter of the nozzle hole to realize the opening and closing of the nozzle hole.

[0013] In one of the embodiments, the connection point between the accommodating cavity and the nozzle hole is a conical surface section to improve the sealing performance.

[0014] In one embodiment, the accommodating cavity is a countersunk hole.

[0015] The above methanol injector structure, through the valve core and the guide hole of the retainer, separates the flow channel into the first channel and the second channel, methanol is introduced into the second channel to form a methanol pressure space, and the first channel is introduced into the compressed gas with the same pressure as methanol. When the methanol injector is working, the valve core moves up and down with the excitation signal, and the guide hole plays an accurate guiding role. Due to the effect of pressure, methanol forms a film in the gap. The air pressure in the first channel is the same as the pressure of methanol, and methanol cannot enter the first channel, thereby avoiding methanol entering the valve core to gradually form a colloid and causing the valve core to fail. It is prevented that the methanol precipitate accumulated in the second channel will enter the valve core as the valve core moves, and the methanol precipitate is prevented from affecting the normal movement of the valve core. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A structural cross-sectional view of a methanol fuel injector structure according to one aspect of the present invention;

[0017] Figure 2 for Figure 1 Cross-sectional view in CC direction;

[0018] Figure 3 A top view of the methanol fuel injector structure of the present invention;

[0019] Figure 4 It is a structural schematic diagram of the housing in the present invention;

[0020] Figure 5 It is a structural schematic diagram of the valve core in the present invention;

[0021] Figure 6 It is a schematic diagram of the structure of the retainer in the present invention;

[0022] Figure 7 It is a structural schematic diagram of the valve seat in the present invention;

[0023] Figure 8 It is a schematic diagram of the structure of the hole sheet in the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described herein are only used to explain the present invention and do not limit the scope of protection of the present invention.

[0025] It should be noted that when an element is referred to as being "disposed on" or "fixed on" another element, it may be directly on the other element or there may be a central element. When an element is referred to as being "fixed on" another element, or being "fixedly connected" to another element, they may be fixed in a detachable manner or in a non-detachable manner. When an element is considered to be "connected" or "rotatably connected" to another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right", "upper", "lower" and similar expressions used in this specification are for illustrative purposes only and do not represent the only implementation method.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to restrict the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0027] The terms "first", "second", "third" and the like in the present invention do not represent specific quantities and orders, but are merely used to distinguish names. It should also be understood that when explaining an element, although not explicitly described, the element is interpreted as including an error range, which should be within the acceptable deviation range of a specific value determined by a person skilled in the art. For example, "approximately", "approximately" or "substantially" may mean within one or more standard deviations, which are not limited here.

[0028] See also Figures 1 to 8 For example, a methanol injector structure includes: a shell 10, a valve core 20, a retainer 30 and a valve seat 40, the shell defines a fuel flow channel 11, the valve seat 40 is arranged at the bottom end of the shell 10, a guide hole 31 is provided in the middle position of the retainer, the retainer is arranged in the flow channel, the outer wall of the retainer is adapted to the diameter of the flow channel, the outer side wall of the valve core is slidably matched with the guide hole to separate the flow channel into a first channel and a second channel close to the valve seat, the upper part of the first channel is sealed to form a gas pressure chamber, the second channel is used to pass methanol, and the first channel is used to pass compressed gas with the same pressure as methanol.

[0029] In one of the embodiments, the methanol injector structure further includes a control component, wherein the control component is used to control the axial movement of the valve core between an open position and a closed position.

[0030] like Figure 3 As shown, in one embodiment, a compressed gas pipe connector 37 and a methanol pipe connector 36 are provided on the shell, and the compressed gas pipe connector and the methanol pipe connector are located on the same side and are arranged in parallel.

[0031] In one embodiment, the outer side of the shell extends to form a connecting socket 50, a coil 52 is provided between the first channel and the shell, and a conductive terminal 53 connected to the coil is provided on the connecting socket.

[0032] like Figure 5As shown, in one embodiment, the valve core includes a first shaft section 21, a second shaft section 22 and a steel ball 23, the first shaft section 21 is connected to the second shaft section 22, the steel ball 23 is arranged at the front end of the second shaft section, the valve core is movably connected to the inner wall of the flow channel, that is, the outer wall of the first shaft section is movably connected to the inner wall of the flow channel, and the outer surface of the second shaft section is matched with the guide hole gap so that the steel ball is always automatically centered with the valve seat without over-positioning. In another embodiment, the outer wall of the first shaft section is fitted with the inner wall of the second flow channel to form a positioning, so that the valve core reciprocates along the axial direction of the flow channel, so that the steel ball can always be automatically centered with the nozzle hole without over-positioning, and its guiding effect on the movement direction prevents the trajectory from being offset, so as to move smoothly. In order to make the valve core guide more smoothly, two ring grooves are axially spaced on the outer circle of the first shaft section, and the design of the ring groove makes the valve core circumference hydraulically balanced.

[0033] In one embodiment, the width of the second shaft segment is smaller than the width of the first shaft segment, so as to facilitate the cooperation between the second shaft segment and the guide hole.

[0034] In one embodiment, a first valve cavity 24 and a second valve cavity 25 connected to the first valve cavity are provided in the center of the first shaft segment from top to bottom, the first valve cavity 24 is connected to the first channel, the second valve cavity 25 is at least partially located in the second shaft segment 22, and a valve hole 26 connected to the second valve cavity is provided on the side wall of the second shaft segment 22, and the valve hole 26 is used to pass compressed gas with the same pressure as methanol.

[0035] like Figure 7 As shown, in one embodiment, the valve seat includes a receiving cavity 41, a nozzle hole 42 and a buffer cavity 44, the width of the buffer cavity 44 is greater than the width of the nozzle hole 42, the front end of the valve core extends from the guide hole 31 to the receiving cavity 41, and the outer diameter of the steel ball 23 matches the inner diameter of the nozzle hole 42 to realize the opening and closing of the nozzle hole. The receiving cavity can be the second channel, or the cavity between the retainer and the valve seat is the second channel, and the second channel includes the receiving cavity.

[0036] In one embodiment, the connection between the accommodating cavity and the nozzle hole is a conical surface section 43 to improve the sealing performance. Preferably, the accommodating cavity is a countersunk hole.

[0037] See also Figure 1 and Figure 8In one embodiment, the methanol injector structure further includes a orifice plate 60, which is disposed in the valve seat. The orifice plate 60 is disposed at the junction of the nozzle hole 42 and the buffer cavity 44, so that a buffer condensation cavity is formed between the orifice plate 60 and the sealing ball. The orifice plate is provided with a plurality of spray holes connected to the nozzle hole, and each of the spray holes 61 is arranged in a ring, for example, each of the spray holes 61 is arranged in a ring at the same interval.

[0038] See also Figure 4 and Figure 6 In one embodiment, a gas channel 12 and a fuel channel 13 are further provided in the housing, the compressed gas pipe joint is communicated with the valve hole 26 through the gas channel 12, and the methanol pipe joint is communicated with the accommodating cavity 41 through the fuel channel 13. Specifically, the retainer 30 is provided with a first through hole 32 and a second through hole 33, the first through hole 32 is communicated with the second through hole 33, the inlet of the first through hole is communicated with the fuel channel, and the outlet of the second through hole 33 is communicated with the accommodating cavity 41. The first through hole is formed by the groove on the side wall of the retainer and the inner wall of the flow channel.

[0039] See also Figure 2 In one embodiment, the methanol injector structure further includes a bayonet 70 and a spring 80. The bayonet 70 is arranged in the first channel. The outer surface of the bayonet 70 is adapted to the first channel. The top of the bayonet is sealed by a bayonet plug 71. The top of the spring acts on the bottom of the bayonet, and the bottom of the spring acts on the bottom of the first valve cavity 24 of the valve core. Under the action of the spring, the steel ball presses on the sealing cone 43 of the valve seat to seal the nozzle hole. The first channel includes a bayonet cavity 72 and a spring cavity 81. The spring cavity 81 is connected to the bayonet cavity 72. The compressed gas pipe joint 37 is connected to the valve hole 26 through the gas channel 12 in the housing. The spring cavity is connected to the bayonet cavity. The upper end of the bayonet cavity is sealed by the bayonet plug 71. The valve hole is connected to the spring cavity. The gas forms a gas pressure cavity between the bayonet plug and the retainer.

[0040] In conjunction with the accompanying drawings, the principle of the present invention is as follows: the conductive terminal is connected to the external circuit. After the conductive terminal is energized, the coil generates a magnetic field, thereby causing the valve core to move to the right, the injector nozzle opens, and methanol passes through the methanol pipe joint methanol 36, the methanol elbow 35, the fuel channel, the first through hole 32, the second through hole 33, and then enters the accommodating chamber 41 to form a methanol pressure space. At the same time, as the valve core moves, the methanol precipitate accumulated in the second channel will enter the valve core to prevent the methanol precipitate from affecting the normal movement of the valve core. When the methanol injector is working, the valve core moves up and down with the excitation signal, and the guide hole 31 plays an accurate guiding role. Due to the effect of pressure, methanol forms a thin film in the gap, and the air pressure in the first channel is the same as the pressure of methanol. Methanol cannot enter the first channel, thereby avoiding methanol entering the valve core to gradually form a colloid, causing the valve core to fail.

[0041] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A methanol injector structure, characterized in that: include: A housing, a valve core, a retainer and a valve seat, wherein a compressed gas pipe joint and a methanol pipe joint are provided on the housing, and the compressed gas pipe joint and the methanol pipe joint are located on the same side and are arranged in parallel; the housing defines a flow channel for the fuel, the valve seat is arranged at the bottom end of the housing, a guide hole is arranged in the middle position of the retainer, and the retainer is arranged in the flow channel, the outer side wall of the valve core and the guide hole are slidably matched to separate the flow channel into a first channel and a second channel close to the valve seat, the upper part of the first channel is sealed to form a gas pressure chamber, the second channel is used to pass methanol, and the first channel is used to pass compressed gas with the same pressure as methanol; the valve core comprises a first shaft segment, a second shaft segment and a steel ball, the first shaft segment is connected to the second shaft segment, the steel ball is arranged at the front end of the second shaft segment, the outer side wall of the first shaft segment is movably connected to the inner wall of the flow channel, and the outer surface of the second shaft segment and the guide hole are gap matched to make The steel ball is always automatically centered with the valve seat without over-positioning; the center of the first shaft segment is provided with a first valve cavity and a second valve cavity connected to the first valve cavity from top to bottom, the first valve cavity is connected to the first channel, the second valve cavity is at least partially located in the second shaft segment, and the side wall of the second shaft segment is provided with a valve hole connected to the second valve cavity, and the valve hole is used to pass compressed gas with the same pressure as methanol; the valve seat includes a accommodating cavity and a nozzle hole, and a gas channel and a fuel channel are also provided in the shell, the compressed gas pipe joint is connected to the valve hole through the gas channel, and the methanol pipe joint is connected to the accommodating cavity through the fuel channel; the retaining frame is provided with a first through hole and a second through hole, the first through hole is connected to the second through hole, the inlet of the first through hole is connected to the fuel channel, and the outlet of the second through hole is connected to the accommodating cavity; the first through hole is formed by the groove on the side wall of the retaining frame and the inner wall of the flow channel.

2. The methanol injector structure according to claim 1, characterized in that: A control assembly is also included, and the control assembly is used to control the axial movement of the valve core between the open position and the closed position.

3. The methanol injector structure according to claim 1, characterized in that: The outer side of the shell extends to form a connecting socket, a coil is arranged between the first channel and the shell, and a conductive terminal connected to the coil is arranged on the connecting socket.

4. The methanol injector structure according to claim 1, characterized in that: The width of the second shaft section is smaller than the width of the first shaft section.

5. The methanol injector structure according to claim 1, characterized in that: The front end of the valve core extends from the guide hole to the accommodating cavity, and the outer diameter of the steel ball matches the inner diameter of the nozzle hole to realize the opening and closing of the nozzle hole.

6. The methanol injector structure according to claim 5, characterized in that: The connection point between the accommodating cavity and the nozzle hole is a conical surface section to improve the sealing performance.

7. The methanol injector structure according to claim 6, characterized in that: The accommodating cavity is a countersunk hole.

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