CN219081723U - Exhaust gas circulation butterfly valve - Google Patents
Exhaust gas circulation butterfly valve Download PDFInfo
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- CN219081723U CN219081723U CN202223207223.4U CN202223207223U CN219081723U CN 219081723 U CN219081723 U CN 219081723U CN 202223207223 U CN202223207223 U CN 202223207223U CN 219081723 U CN219081723 U CN 219081723U
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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
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The utility model relates to the technical field of automobiles, and provides an exhaust gas circulation butterfly valve; the exhaust gas circulation butterfly valve comprises a valve body, a butterfly plate, a valve rod and a corrosion-resistant bushing; the valve body is internally provided with a channel, the corrosion-resistant bushing is arranged in the channel, and the outer wall of the corrosion-resistant bushing is in sealing fit with the inner wall of the channel; the butterfly plate is installed in the corrosion-resistant bushing, and the valve rod penetrates through the valve body and the corrosion-resistant bushing to be connected with the butterfly plate. According to the utility model, through improvement of the exhaust gas circulation butterfly valve, electrochemical corrosion and even adhesion clamping stagnation phenomena of the butterfly plate and the inner wall of the valve body channel are improved, the corrosion resistance robustness of the exhaust gas circulation butterfly valve is improved, and the service life of the exhaust gas circulation butterfly valve and the operation stability of the whole exhaust gas circulation system are further improved.
Description
Technical Field
The utility model relates to the technical field of automobiles, in particular to an exhaust gas circulation butterfly valve.
Background
In automobiles, harmful emissions from fuel engines are a major source of atmospheric pollution, and thus the amount of harmful emissions is reduced by providing an exhaust gas circulation system in the entire vehicle. The low-pressure gasoline exhaust gas circulation butterfly valve is arranged on the air outlet side of a cooler of the engine, high-temperature exhaust gas generated by engine combustion firstly enters the exhaust gas circulation butterfly valve after being primarily cooled by the cooler, condensate is generated due to temperature difference, and if the emission contains strong oxides such as halogen elements, the condensate flows to the exhaust gas circulation valve along with the condensate.
Based on different service conditions of the automobile, the exhaust gas circulation butterfly valve is adaptively adjusted to be opened and closed, and when the automobile normally operates, the exhaust gas circulation butterfly valve controls the opening of the butterfly plate according to the system requirement, so that the exhaust gas inflow is controlled. The high-temperature gas passes through the valve plate, liquid drops in the gas are precipitated due to the temperature reduction, and condensate is formed by attaching the high-temperature gas to the valve plate and the inner wall of the main channel. The butterfly plate of the exhaust gas circulation butterfly valve is in a normally closed state during parking, condensate flows through the inlet side of the valve to accumulate at the butterfly plate, the valve body of the existing exhaust gas circulation butterfly valve is made of aluminum alloy, and condensed accumulated liquid can cause electrochemical reaction between the butterfly plate and a valve body channel to generate corrosion, so that the butterfly plate and the valve body channel inner wall are corroded and even stuck and blocked, the valve plate cannot be normally opened and closed, and the normal operation of the whole exhaust gas circulation system is influenced.
Disclosure of Invention
The utility model aims to provide an exhaust gas circulation butterfly valve, which improves electrochemical corrosion and even adhesion clamping stagnation phenomena at the inner wall of a butterfly plate and a valve body channel through improving the exhaust gas circulation butterfly valve, improves the corrosion resistance robustness of the exhaust gas circulation butterfly valve, and further improves the service life of the exhaust gas circulation butterfly valve and the operation stability of the whole exhaust gas circulation system.
The utility model provides an exhaust gas circulation butterfly valve, which comprises a valve body, a butterfly plate, a valve rod and a corrosion-resistant bushing, wherein the butterfly plate is arranged on the valve body;
the valve body is internally provided with a channel, the corrosion-resistant bushing is arranged in the channel, and the outer wall of the corrosion-resistant bushing is in sealing fit with the inner wall of the channel;
the butterfly plate is installed in the corrosion-resistant bushing, and the valve rod penetrates through the valve body and the corrosion-resistant bushing to be connected with the butterfly plate.
The corrosion-resistant lining is made of a corrosion-resistant material, the material of the corrosion-resistant lining is not limited, and specific materials are based on no electrochemical reaction, and can be stainless steel materials, alumina fine ceramics, acid-resistant enamel, alkali-resistant concrete, unsaturated polyester resin and the like. In addition, the corrosion-resistant lining can also be made of composite materials, for example, by a mode of adding a corrosion-resistant coating to the base lining, the specific materials of the base lining and the coating are not limited, corresponding materials can be selected according to the use requirement and the assembly requirement adaptability, and the base lining can be made of materials consistent with the valve body, for example, aluminum alloy materials; the corrosion-resistant coating is coated on the surface of the substrate lining to realize a corrosion-resistant function, and the corrosion-resistant coating can be a plasma coating, a Teflon coating, an epoxy resin anode electrophoretic paint, a polyolefin coating and the like.
Through increasing corrosion-resistant bush structure in the passageway for corrosion-resistant bush keeps apart between valve body and butterfly plate, consequently, the condensation deposition can not direct contact with the valve body, improves the electrochemical corrosion of butterfly plate and valve body passageway inner wall department and even glues even and link the clamping stagnation phenomenon, improves the corrosion-resistant robustness of exhaust gas circulation butterfly valve, and then improves exhaust gas circulation butterfly valve's life and whole exhaust gas circulation system's operating stability. And the corrosion-resistant lining is made of a corrosion-resistant material, so that the phenomenon that the corrosion-resistant lining is corroded by electricity can be prevented, the phenomenon of corrosion adhesion between the butterfly plate and the corrosion-resistant lining is further guaranteed, the phenomenon that the function of the valve body is invalid due to the adhesion of the electrochemical corrosion is effectively prevented, and the corrosion-resistant robustness and the service life of the exhaust gas circulation butterfly valve are further improved.
Optionally, the exhaust gas circulation butterfly valve further comprises a positioning member disposed on the corrosion resistant bushing for positioning the corrosion resistant bushing relative to the channel. The positioning piece is arranged to be beneficial to enabling the positioning piece to be positioned effectively relative to the channel, and the assembly precision and stability of the positioning piece and the channel are improved.
Optionally, the positioning piece comprises a groove, the groove is arranged on the outer wall of the corrosion-resistant bushing, and the inner wall of the channel is provided with a protrusion matched with the groove in a conformal manner. The specific structure of the groove and the protrusion is not limited herein, and the groove is adapted to the shape of the protrusion, for example, the groove may be a circular groove, a rectangular groove, an annular groove or a groove with other shapes, and the groove may extend circumferentially or axially, or may extend in an oblique direction between the circumferential direction and the axial direction. In addition, the specific arrangement positions of the grooves and the protrusions are not particularly limited, for example, the grooves can be formed in the middle position of the outer wall of the corrosion-resistant bushing; for another example, the groove may be formed in a position of the outer wall of the corrosion-resistant bushing near an axial end thereof, and may be communicated to a certain axial end of the corrosion-resistant bushing; the structure of a specific groove and the setting position of the groove can be adaptively adjusted based on the actual assembly structure.
The groove on the outer wall of the corrosion-resistant bushing is matched with the protrusion on the inner wall of the channel to position the corrosion-resistant bushing, the groove is arranged on the outer wall of the corrosion-resistant bushing, so that the corrosion-resistant bushing is convenient to process and shape, and the structure is also beneficial to the integral molding of the corrosion-resistant bushing and the valve body in a die casting way.
Optionally, the grooves include a first groove extending along a circumferential direction of the corrosion-resistant liner and a second groove extending along an axial direction of the corrosion-resistant liner. The first groove is used for axially positioning the corrosion-resistant bushing, and the second groove is used for circumferentially positioning the corrosion-resistant bushing.
Optionally, the first groove and the second groove intersect. The first groove is intersected with the second groove, so that the corrosion-resistant bushing with the structure is more suitable for a matching mode of die-casting integrated forming; after the die is assembled, the molten metal at high temperature is injected into the die cavity, and the first grooves and the second grooves are communicated with each other, so that the molten metal is facilitated to flow along the grooves to fill the first grooves and the second grooves, on one hand, the forming quality is improved, on the other hand, the contact area of the valve body and the corrosion-resistant bushing is increased, and the valve body and the corrosion-resistant bushing form a mutual engagement relationship, so that the connecting strength is improved.
Optionally, the second groove communicates in an axial direction to at least one axial end of the corrosion-resistant liner.
Optionally, the second groove communicates in an axial direction to an air inlet end of the corrosion resistant liner. The air inlet end of the corrosion-resistant bushing is used as a die drawing side, and in the actual die drawing process, the die is drawn from the air inlet end to the air outlet end of the corrosion-resistant bushing.
Optionally, the corrosion-resistant bushing is made of stainless steel; and/or, the butterfly plate is made of stainless steel; and/or, the valve rod is made of stainless steel. The material of the corrosion-resistant bushing is selected to be stainless steel, so that the corrosion resistance is good, and the low material cost is guaranteed.
Optionally, the valve rod is connected with the butterfly plate through a connecting piece, and the connecting piece is made of stainless steel. The butterfly plate, the valve rod, the corrosion-resistant bushing and the connecting piece are all made of stainless steel, so that the position which is possibly contacted with the condensate is made of stainless steel, the electrochemical corrosion phenomenon can be effectively prevented, and the position which is possibly contacted with the condensate is made of stainless steel, so that other parts of the exhaust gas circulation butterfly valve can be kept consistent with the existing materials, for example, the valve body can keep the aluminum alloy material unchanged.
Optionally, an annular drawing groove is formed in the outer wall of the corrosion-resistant bushing along the circumferential direction, and the drawing groove is communicated to one axial end of the corrosion-resistant bushing.
Optionally, the draft slot communicates to an air inlet end of the corrosion resistant bushing. The setting of drawing die groove makes the external diameter of corrosion-resistant bush's air inlet end diminish, then does benefit to and draws the mould from corrosion-resistant bush's air inlet end to air outlet end side.
Optionally, the inner wall of the end of the corrosion-resistant bushing, which is close to the air outlet of the channel, is in smooth transition connection with the inner wall of the channel. The condensed liquid accumulated on the air outlet side can smoothly flow out from the air outlet side without being blocked.
Optionally, the mounting groove has been seted up to the inner wall of passageway, the mounting groove intercommunication to the inlet end of passageway, corrosion-resistant bush install in the mounting groove, just corrosion-resistant bush's the end of giving vent to anger support on the mounting groove is close to on the lateral wall of the end of giving vent to anger of passageway. The mounting groove is convenient for the corrosion-resistant bush to be embedded into the channel on one hand, and on the other hand, the positioning of one axial side of the corrosion-resistant bush can be realized.
In summary, the exhaust gas circulation butterfly valve comprises a valve body, a butterfly plate, a valve rod and a corrosion-resistant bushing;
the valve body is internally provided with a channel, the corrosion-resistant bushing is arranged in the channel, and the outer wall of the corrosion-resistant bushing is in sealing fit with the inner wall of the channel; the butterfly plate is installed in the corrosion-resistant bushing, and the valve rod penetrates through the valve body and the corrosion-resistant bushing to be connected with the butterfly plate.
By arranging the corrosion-resistant lining structure in the channel, the corrosion-resistant lining is isolated between the valve body and the butterfly plate, so that the condensed liquid cannot directly contact with the valve body, the electrochemical corrosion and even adhesion clamping stagnation phenomena at the inner wall of the channel between the butterfly plate and the valve body are improved, the corrosion resistance robustness of the exhaust gas circulation butterfly valve is improved, and the service life of the exhaust gas circulation butterfly valve and the operation stability of the whole exhaust gas circulation system are further improved. And the corrosion-resistant lining is made of a corrosion-resistant material, so that the phenomenon that the corrosion-resistant lining is corroded by electricity can be prevented, the phenomenon of corrosion adhesion between the butterfly plate and the corrosion-resistant lining is further guaranteed, the phenomenon that the function of the valve body is invalid due to the adhesion of the electrochemical corrosion is effectively prevented, and the corrosion-resistant robustness and the service life of the exhaust gas circulation butterfly valve are further improved.
Drawings
FIG. 1 is a schematic diagram of an exhaust gas recirculation butterfly valve according to an embodiment of the utility model;
FIG. 2 is a schematic diagram of a part of an exhaust gas recirculation butterfly valve according to an embodiment of the utility model;
FIG. 3 is a schematic top view of FIG. 2;
wherein, the reference numerals are as follows:
10-a valve body; 11-channel; 12-mounting grooves;
20-butterfly plate;
30-valve stem;
40-corrosion-resistant bushings; 41-drawing a die groove;
50-positioning pieces; 51-a first groove; 52-second groove.
60-connecting piece;
A. b-the first groove and the second groove intersect the sharp portion.
Detailed Description
The exhaust gas recirculation butterfly valve according to the utility model is described in further detail below with reference to the accompanying drawings and specific examples. The advantages and features of the present utility model will become more apparent from the following description. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the utility model.
As used in this disclosure, the singular forms "a," "an," and "the" include plural referents, the term "or" are generally used in the sense of comprising "and/or" and the term "several" are generally used in the sense of comprising "at least one," the term "at least two" are generally used in the sense of comprising "two or more," and the term "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying any relative importance or number of features indicated. Thus, a feature defining "a first", "a second", "a third" may include one or at least two such features, either explicitly or implicitly. Furthermore, as used in this disclosure, "mounted," "connected," and "disposed" with respect to another element should be construed broadly to mean generally only that there is a connection, coupling, mating or transmitting relationship between the two elements, and that there may be a direct connection, coupling, mating or transmitting relationship between the two elements or indirectly through intervening elements, and that no spatial relationship between the two elements is to be understood or implied, i.e., that an element may be in any orientation, such as internal, external, above, below, or to one side, of the other element unless the context clearly dictates otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances. Furthermore, directional terms, such as above, below, upper, lower, upward, downward, left, right, etc., are used with respect to the exemplary embodiments as they are shown in the drawings, upward or upward toward the top of the corresponding drawing, downward or downward toward the bottom of the corresponding drawing.
In automobiles, harmful emissions from fuel engines are a major source of atmospheric pollution, and thus the amount of harmful emissions is reduced by providing an exhaust gas circulation system in the entire vehicle. The high-temperature waste gas generated by engine combustion firstly enters the waste gas circulation butterfly valve after being primarily cooled by the cooler, and then the waste gas containing halogen ions such as Cl, F and the like is cooled to generate condensation effusion containing the halogen ions such as Cl, F and the like, and the gas is deposited on the inner wall through the valve body along with the temperature reduction, so that electrolyte is formed.
Based on different service conditions of the automobile, the exhaust gas circulation butterfly valve is adaptively adjusted to be opened and closed, and when the automobile normally operates, the exhaust gas circulation butterfly valve controls the opening of the butterfly plate according to the system requirement, so that the exhaust gas inflow is controlled. The condensate is discharged laterally to the outlet side through the inlet side of the valve. The butterfly plate of the exhaust gas circulation butterfly valve is in a normally closed state during parking, condensate flows through the inlet side of the valve to be accumulated at the butterfly plate, the valve body of the existing exhaust gas circulation butterfly valve is made of aluminum alloy materials, in the actual use process, the condensate accumulated liquid can cause electrochemical corrosion between the butterfly plate and a valve body channel, the butterfly plate and the valve body channel inner wall are caused to be corroded and adhered, the structure causes defects of the valve body, the valve body needs to be replaced integrally in the later maintenance process, and the maintenance cost is high.
The utility model aims to provide an exhaust gas circulation butterfly valve, which improves electrochemical corrosion and even adhesion clamping stagnation phenomena at the inner wall of a butterfly plate and a valve body channel through improving the exhaust gas circulation butterfly valve, improves the corrosion resistance robustness of the exhaust gas circulation butterfly valve, and further improves the service life of the exhaust gas circulation butterfly valve and the operation stability of the whole exhaust gas circulation system.
Based on this, the present embodiment proposes an exhaust gas circulation butterfly valve including a valve body 10, a butterfly plate 20, a valve stem 30, and a corrosion-resistant bushing 40;
the valve body 10 is internally provided with a channel 11, the corrosion-resistant bushing 40 is arranged in the channel 11, and the outer wall of the corrosion-resistant bushing 40 is in sealing fit with the inner wall of the channel 11;
the butterfly plate 20 is mounted in the corrosion-resistant bushing 40, and the valve rod 30 is connected with the butterfly plate 20 through the valve body 10 and the corrosion-resistant bushing 40.
Referring to fig. 1, the corrosion-resistant bushing 40 is installed inside the channel 11, the valve body 10 and the corrosion-resistant bushing 40 are provided with assembly holes in a direction perpendicular to the channel 11, the valve rod 30 passes through the valve body 10 and the corrosion-resistant bushing 40 to extend into the corrosion-resistant bushing 40 through the assembly holes, the valve rod 30 is in sealing and rotating fit with the assembly holes, the valve rod 30 is provided with butterfly plate mounting holes along a radial direction, the corresponding butterfly plates 20 pass through the butterfly plate mounting holes, and the valve rod 30 is connected with the butterfly plates 20 through the connecting piece 60. The specific structure of the connector 60 is not limited herein, and for example, the connector 60 may be a screw, a buckle, or other known connection structure, and of course, the valve rod 30 and the butterfly plate 20 may be connected by welding. In this embodiment, the connecting piece 60 is a screw, the butterfly plate 20 is fixed on the valve rod 30 by two screws, one end of the valve rod 30 extends to the outside of the valve body 10, and the butterfly plate 20 can be driven to rotate by the valve rod 30, so that the butterfly plate 20 is switched between a closed state and an open state. The inner wall of the corrosion-resistant bush 40 is a cylindrical smooth surface, the butterfly plate 20 is disc-shaped, and when the butterfly plate 20 rotates to a position vertical to the axial direction of the corrosion-resistant bush 40, the butterfly plate 20 seals the inner cavity of the corrosion-resistant bush 40, so that the channel 11 is closed.
The shape of the channel 11 and the outer contour of the corrosion-resistant bush 40 are not limited, for example, the channel 11 may be a conventional circular channel, in which case the outer contour of the corrosion-resistant bush 40 may be matched with a cylindrical smooth surface adapted to the shape of the channel 11, and in other alternative embodiments, the shape of the channel 11 and the outer contour of the corrosion-resistant bush 40 may be adapted based on the actual assembly structure and the use requirement; other structures of the exhaust gas circulation butterfly valve are consistent with the existing butterfly valve structure, and are not repeated here.
Referring to fig. 1, in fig. 1, the right port of the channel 11 is used as an air outlet, the left port of the channel 11 is used as an air inlet, and the air outlet of the channel 11 is a tapered opening which is gradually reduced inwards. When the exhaust gas circulation butterfly valve is actually mounted on the vehicle body, a proper mounting angle is set so that the passage 11 is inclined downward from the air inlet to the air outlet side, so that condensate can naturally flow out from the air inlet side to the air outlet side when the butterfly plate 20 is in an open state; when the butterfly plate 20 is in the closed state, part of condensate flows from the air inlet side to the butterfly plate 20 side and is accumulated at the butterfly plate 20, and at this time, due to the arrangement of the corrosion-resistant bushing 40, the condensate is accumulated in the space formed by the corrosion-resistant bushing 40 and the butterfly plate 20, so that the condensate is prevented from directly contacting the valve body 10 and the butterfly plate 20. To ensure a good isolation, the butterfly plate 20 should be mounted at a distance from the air inlet end of the corrosion-resistant bushing 40, the specific distance being set adaptively to the assembly requirements.
The corrosion-resistant lining 40 is made of a corrosion-resistant material, and the material of the corrosion-resistant lining 40 is not limited, and specific materials are based on no electrochemical reaction, for example, stainless steel materials, alumina fine ceramics, acid-resistant enamel, alkali-resistant concrete, unsaturated polyester resin and the like.
In other alternative embodiments, the corrosion-resistant lining 40 may also be made of a composite material, for example, by adding a corrosion-resistant coating to the base lining, where the specific materials of the base lining and the coating are not limited, and the base lining may be made of a material consistent with the valve body 10, for example, an aluminum alloy material, according to the usage requirement and the fitting requirement; the corrosion-resistant coating is coated on the surface of the substrate bushing to realize the corrosion-resistant function, and the corrosion-resistant coating can be a plasma coating, a Teflon coating, an epoxy resin anode electrophoretic paint, a polyolefin coating and the like, and is suitable for the butterfly plate 20 and the connecting piece 60, and the corrosion-resistant coating can be additionally arranged on the original substrate to achieve the corrosion-resistant effect, so that the details are not repeated.
The corrosion-resistant bush 40 is in sealing connection with the passage 11 of the valve body 10, and the corrosion-resistant bush 40 is isolated between the valve body 10 and the butterfly plate 20, so that the condensate cannot directly contact with the valve body 10, thereby improving the corrosion phenomenon of the valve body. Through the setting of corrosion-resistant bush 40, also prevent to take place electrochemical corrosion between butterfly plate 20 and the corrosion-resistant bush 40, avoid having to take place electrochemical corrosion phenomenon between butterfly plate 20 and the corrosion-resistant bush 40, and then avoid butterfly plate 20 part to produce the defect, can take place the corrosion adhesion phenomenon between guaranteeing butterfly plate 20 and the corrosion-resistant bush 40, effectively prevent because the corrosion adhesion leads to the phenomenon of valve body function inefficacy to improve exhaust gas recirculation butterfly valve's life and corrosion-resistant robustness, and improve exhaust gas recirculation system's stability. In other alternative embodiments, the material of the corrosion barrier liner 40 may be selected adaptively based on the needs of the application.
In addition, in this embodiment, the materials of the butterfly plate 20, the valve rod 30 and the connecting piece 60 are not limited, and the materials can be selected according to the actual use requirements, and in this embodiment, the corrosion-resistant bushing 40 is preferably made of stainless steel; and/or, the butterfly plate 20 is made of stainless steel; and/or the valve rod 30 is made of stainless steel, and/or the connecting piece 60 is made of stainless steel. The definition of stainless steel is explained in detail in the corresponding national standard or technical manual, and will not be repeated here. As shown in FIG. 1, the butterfly plate 20, the valve rod 30, the corrosion-resistant bushing 40 and the connecting member 60 are made of stainless steel, so that the positions possibly contacting the condensate are made of stainless steel, the electrochemical corrosion phenomenon can be effectively prevented, and other parts of the exhaust gas circulation butterfly valve can be kept consistent with the existing materials, for example, the valve body 10 can keep the aluminum alloy material unchanged because the positions possibly contacting the condensate are made of stainless steel.
In this embodiment, the outer wall of the corrosion-resistant bush 40 may be provided with a cylindrical light surface structure, and at this time, the inner wall of the channel 11 may also be provided with a light surface structure adapted to the outer wall of the corrosion-resistant bush 40, and the two may be in sealing connection through interference fit.
In this embodiment, the outer wall of the corrosion-resistant bush 40 is in sealing engagement with the inner wall of the channel 11, so as to prevent condensate from penetrating between the outer wall of the corrosion-resistant bush 40 and the inner wall of the channel 11; the manner of sealing engagement is not limited herein.
In addition, the outer wall of the corrosion-resistant bushing 40 and the inner wall of the channel 11 can be directly in sealing fit or indirectly in sealing fit;
when indirect sealing fit is adopted, as shown in fig. 1, the corrosion-resistant bush 40 can be embedded into the channel 11, and axial sealing is realized between the axial end surface of the corrosion-resistant bush 40 and the embedded stepped surface of the channel 11 by adding a sealing ring, so that the effect of preventing condensate from penetrating between the outer wall of the corrosion-resistant bush 40 and the inner wall of the channel 11 is also achieved.
When a direct sealing mode is adopted, the following steps are adopted:
in an alternative embodiment, the outer wall of the corrosion barrier liner 40 and the inner wall of the passageway 11 may be sealingly engaged by a sealing ring.
In another alternative embodiment, the seal fit between the outer wall of the corrosion resistant bushing 40 and the inner wall of the channel 11 may be achieved by an interference fit, wherein the corrosion resistant bushing 40 is press-fit; after the valve body 10 blank shell is molded, the channel 11 which needs to be press-fitted is subjected to finish machining, the interference size during press-fitting is guaranteed to meet the requirement, then the outer diameter of the corrosion-resistant bushing 40 is machined to the interference fit size, and a matched tool is used for carrying out liquid nitrogen cold fitting, so that the corrosion-resistant bushing 40 can be installed in the channel 11 in an interference fit mode, the valve body 10 and the corrosion-resistant bushing 40 are subjected to finish machining in the later stage, and the outer wall of the corrosion-resistant bushing 40 is in sealing fit with the inner wall of the channel 11, so that the corrosion resistance robustness of the whole exhaust gas circulation butterfly valve is effectively improved.
In another alternative embodiment, the sealing engagement may be achieved by means of a welded connection at the point where the outer wall of the corrosion barrier liner 40 meets the inner wall of the channel 11.
In another alternative embodiment, the sealing engagement between the outer wall of the corrosion barrier liner 40 and the inner wall of the passageway 11 may be achieved by means of an adhesive connection.
In another alternative embodiment, the sealing engagement between the outer wall of the corrosion barrier liner 40 and the inner wall of the channel 11 may be achieved by means of a riveted connection.
In another alternative embodiment, the corrosion-resistant bush 40 and the valve body 10 may be integrally formed by die casting, so that the outer wall of the corrosion-resistant bush 40 is in sealing fit with the inner wall of the channel 11; the corrosion-resistant bushing 40 is preheated and fixed in the channel cavity of the valve body molding die at the time of die casting of the valve body 10. After the mold is closed, the molten metal at high temperature is injected into the mold cavity, so that the molten metal and the corrosion-resistant bushing 40 are integrally molded. After forming, the corrosion-resistant bush 40 is naturally embedded into the channel 11 of the valve body 10, at the moment, the outer wall of the corrosion-resistant bush 40 is naturally matched with the inner wall of the channel 11 in a sealing way, and then the size and the precision requirements of the valve body 10, the channel 11 and the corrosion-resistant bush 40 are ensured through post-finishing.
Further, the exhaust gas recirculation butterfly valve further includes a positioning member 50, where the positioning member 50 is disposed on the corrosion-resistant liner 40 for positioning the corrosion-resistant liner 40 relative to the channel 11.
The specific structure of the positioning member 50 is not limited herein, and may be, for example, a positioning pin, a positioning protrusion, or other known positioning structures, and the specific structure of the positioning member 50 may be adaptively selected based on the matching manner of the corrosion resistant bushing 40 and the channel 11, which is not described herein. The positioning piece is arranged to be beneficial to effectively positioning the positioning piece 50 relative to the channel 11, so that the assembly precision and stability of the positioning piece and the channel are improved.
Further, the positioning member includes a groove provided on the outer wall of the corrosion-resistant bushing 40, and the inner wall of the channel 11 has a protrusion that is in conformal engagement with the groove.
The groove on the outer wall of the corrosion-resistant bushing 40 is matched with the protrusion on the inner wall of the channel 11 to position the corrosion-resistant bushing 40, the groove 11 is arranged on the outer wall of the corrosion-resistant bushing 40, so that the corrosion-resistant bushing 40 is convenient to process and mold, and the structure is also beneficial to the die casting integrated molding of the corrosion-resistant bushing 40 and the valve body 10.
The specific structure of the groove and the protrusion is not limited herein, and the groove is adapted to the shape of the protrusion, for example, the groove may be a circular groove, a rectangular groove, an annular groove or a groove with other shapes, and the groove may extend circumferentially or axially, or may extend in an oblique direction between the circumferential direction and the axial direction. In addition, the specific arrangement positions of the grooves and the protrusions are not particularly limited, for example, the grooves may be formed in the middle position of the outer wall of the corrosion-resistant liner 40; for another example, the groove may be formed on the outer wall of the corrosion-resistant liner 40 near the axial end thereof, and may be connected to a certain axial end of the corrosion-resistant liner 40; the structure of a specific groove and the setting position of the groove can be adaptively adjusted based on the actual assembly structure.
In this embodiment, the grooves include a first groove 51 and a second groove 52, the first groove 51 extending in the circumferential direction of the corrosion-resistant liner 40, and the second groove 52 extending in the axial direction of the corrosion-resistant liner 40. The first groove 51 and the second groove 52 intersect.
The first groove 51 is used to axially locate the corrosion barrier liner 40 and the second groove is used to circumferentially locate the corrosion barrier liner 40. The first groove 51 may be an arc groove which extends in the circumferential direction but is not closed, or may be an annular groove which extends in the circumferential direction and is closed; referring to fig. 2 and 3, in the present embodiment, the first groove 51 is an annular groove formed by end-to-end closing after extending along the circumferential direction, and the grooved sections of the first groove 51 and the second groove 52 are not particularly limited herein, and may be, for example, a semicircular groove, a rectangular groove, or a groove body with other cross-sectional shapes. The first groove 51 and the second groove 52 are intersected, so that the corrosion-resistant bushing with the structure is more suitable for a matching mode of die casting integrated molding; after the die is assembled, the molten metal at high temperature is injected into the die cavity, and the first groove 51 and the second groove 52 are intersected and communicated, so that the molten metal is beneficial to flowing along the grooves to fill the first groove 51 and the second groove 52, on one hand, the forming quality is beneficial to improving, on the other hand, the contact area of the valve body 10 and the corrosion-resistant bushing 40 is also beneficial to increasing, and the valve body 10 and the corrosion-resistant bushing 40 form a mutual engagement relationship, so that the connecting strength is improved.
The number of the first grooves 51 and the second grooves 52 is not particularly limited herein, and the specific number thereof may be adjusted as well as the practical fitting structure adaptability. Referring to fig. 2 and 3, in the present embodiment, a first groove 51 and two second grooves 52 are provided, wherein the two second grooves 52 are disposed radially opposite to each other, so that the two second grooves 52 and the first groove 51 form two radially opposite crossing positions.
Here, the groove widths of the first groove 51 and the second groove 52 are not particularly limited, and in the present embodiment, the groove width of the second groove 52 is larger than the groove width of the first groove 51. In other alternative embodiments, the groove widths of the first groove 51 and the second groove 52 may be the same to improve the overall uniformity of the corrosion barrier liner 40; wherein the groove width of the first groove 51 is the dimension in the axial direction, and the groove width of the second groove 52 is the dimension in the circumferential direction.
As shown in fig. 2 and 3, after the corrosion-resistant bushing 40 and the valve body 10 are assembled, an assembly hole may be processed at the crossing position of the first groove 51 and the second groove 52 to mount the valve stem 30, the crossing position of the first groove 51 and the second groove 52 is a rectangular area, and the center of the assembly hole is located at the geometric center position of the rectangular area, wherein the inner diameter size of the assembly hole may be slightly larger than the groove width size of the first groove 51 and the second groove 52. The sharp corners at the crossing positions of the first groove 51 and the second groove 52 may be partially cut during the process, corresponding to the cutting of the sharp corners at the positions a and B shown in fig. 3, to improve the stress concentration phenomenon.
The corrosion resistant liner 40 is formed in a number of ways, one being a machining process that may form a solid blank of material by turning, clamping, washing, planing, grinding, and the like. Alternatively, the hollow blank may be formed by casting and then machined. In the casting molding process, the drawing of the mold is required, and it is required to ensure that the first groove 51 and the second groove 52 cannot affect the drawing of the mold. Thus, the second groove 52 in this embodiment communicates in an axial direction to at least one axial end of the corrosion-resistant liner 40. The second grooves 52 may be connected to both axial ends of the corrosion-resistant liner 40, or may be connected only to the inlet end or the outlet end of the corrosion-resistant liner 40.
As shown in fig. 2 and 3, the second groove 52 communicates in the axial direction to the air intake end of the corrosion-resistant liner 40. The air inlet end of the corrosion-resistant bush 40 is used as the drawing side, and in the actual drawing process, the drawing from the air inlet end to the air outlet end of the corrosion-resistant bush 40 is required.
In an actual casting process, the inner cavity and the outer contour of the corrosion-resistant bushing 40 may be cast first, wherein the outer contour may have the first groove 51 formed therein and the second groove 52 may be formed in cooperation with a subsequent machining.
Further, an annular drawing groove 41 is formed in the outer wall of the corrosion-resistant bushing 40 along the circumferential direction, and the drawing groove 41 is communicated to one axial end of the corrosion-resistant bushing 40. The draft groove 41 communicates to the air inlet end of the corrosion resistant bushing 40.
Referring to fig. 2 and 3, the mold drawing groove 41 is configured to reduce the outer diameter of the air inlet end of the corrosion-resistant bushing 40, so as to facilitate the mold drawing from the air inlet end to the air outlet end of the corrosion-resistant bushing 40. The bottom of the draft groove 41 may also be provided as a slope so that the outer diameter of the air inlet end of the corrosion-resistant bushing 40 is tapered to further facilitate the draft.
In this embodiment, the drawing groove 41 and the second groove 52 are both connected to the air inlet end of the corrosion-resistant bush 40 along the axial direction, and the two cooperate to realize drawing from the air inlet end to the air outlet end of the corrosion-resistant bush 40.
Further, the inner wall of the channel 11 is provided with a mounting groove 12, the mounting groove 12 is communicated to the air inlet end of the channel 11, the corrosion-resistant bushing 40 is mounted in the mounting groove 12, the air outlet end of the corrosion-resistant bushing 40 abuts against the side wall of the mounting groove 12, which is close to the air outlet end of the channel 11, and the air outlet end of the corrosion-resistant bushing 40 is in sealing connection with the side wall so as to prevent condensate from penetrating.
Referring to fig. 2, the mounting groove 12 facilitates the insertion of the corrosion-resistant bush 40 into the passage 11, and also positions the corrosion-resistant bush 40 on one side in the axial direction. After the corrosion-resistant lining 40 is installed in the installation groove 12, the inner wall of the corrosion-resistant lining 40 is not higher than the inner wall of the air outlet side of the channel 11, and further, the inner wall of the end, close to the air outlet of the channel 11, of the corrosion-resistant lining 40 is in smooth transition connection with the inner wall of the channel 11. The condensed liquid accumulated on the air outlet side can smoothly flow out from the air outlet side without being blocked.
In this embodiment, there is also provided an exhaust gas circulation system, in which the above-described exhaust gas circulation butterfly valve is mounted. The exhaust gas circulation system has the same structure as the existing system, except for the replacement of the exhaust gas circulation valve, and will not be described here.
In summary, the exhaust gas circulation butterfly valve comprises a valve body 10, a butterfly plate 20, a valve rod 30 and a corrosion-resistant bushing 40; the valve body 10 is internally provided with a channel 11, the corrosion-resistant bushing 40 is arranged in the channel 11, and the outer wall of the corrosion-resistant bushing 40 is in sealing fit with the inner wall of the channel 11; the butterfly plate 20 is mounted in the corrosion-resistant bushing 40, and the valve rod 30 is connected with the butterfly plate 20 through the valve body 10 and the corrosion-resistant bushing 40.
By arranging the corrosion-resistant lining structure in the channel, the corrosion-resistant lining is blocked between the valve body and the butterfly plate, so that the condensed liquid cannot directly contact with the valve body, the electrochemical corrosion and even adhesion clamping stagnation phenomena at the inner wall of the channel between the butterfly plate and the valve body are improved, the corrosion resistance robustness of the exhaust gas circulation butterfly valve is improved, and the service life of the exhaust gas circulation butterfly valve and the operation stability of the whole exhaust gas circulation system are further improved. And the corrosion-resistant lining is made of a corrosion-resistant material, so that the phenomenon that the corrosion-resistant lining is corroded by electricity can be prevented, the phenomenon of corrosion adhesion between the butterfly plate and the corrosion-resistant lining is further guaranteed, the phenomenon that the function of the valve body is invalid due to the adhesion of the electrochemical corrosion is effectively prevented, and the corrosion-resistant robustness and the service life of the exhaust gas circulation butterfly valve are further improved.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The above description is only illustrative of the preferred embodiments of the present utility model and is not intended to limit the scope of the present utility model, and any alterations and modifications made by those skilled in the art based on the above disclosure shall fall within the scope of the appended claims.
Claims (13)
1. An exhaust gas recirculation butterfly valve, characterized in that: comprises a valve body, a butterfly plate, a valve rod and a corrosion-resistant bushing;
the valve body is internally provided with a channel, the corrosion-resistant bushing is arranged in the channel, and the outer wall of the corrosion-resistant bushing is in sealing fit with the inner wall of the channel;
the butterfly plate is installed in the corrosion-resistant bushing, and the valve rod penetrates through the valve body and the corrosion-resistant bushing to be connected with the butterfly plate.
2. The exhaust gas recirculation butterfly valve of claim 1, wherein: the exhaust gas recirculation butterfly valve further includes a positioning member disposed on the corrosion-resistant bushing for positioning the corrosion-resistant bushing relative to the channel.
3. The exhaust gas recirculation butterfly valve of claim 2, wherein: the locating piece comprises a groove, the groove is arranged on the outer wall of the corrosion-resistant bushing, and the inner wall of the channel is provided with a protrusion which is matched with the groove in a conformal mode.
4. The exhaust gas recirculation butterfly valve of claim 3, wherein: the grooves include a first groove extending along a circumferential direction of the corrosion-resistant liner and a second groove extending along an axial direction of the corrosion-resistant liner.
5. The exhaust gas recirculation butterfly valve of claim 4, wherein: the first groove and the second groove intersect.
6. The exhaust gas recirculation butterfly valve of claim 4, wherein: the second groove communicates in an axial direction to at least one axial end of the corrosion-resistant liner.
7. The exhaust gas recirculation butterfly valve of claim 6, wherein: the second groove is communicated to the air inlet end of the corrosion-resistant bushing along the axial direction.
8. The exhaust gas recirculation butterfly valve of claim 1, wherein: the corrosion-resistant bushing is made of stainless steel; and/or, the butterfly plate is made of stainless steel; and/or, the valve rod is made of stainless steel.
9. The exhaust gas recirculation butterfly valve of claim 1 or 8, wherein: the valve rod is connected with the butterfly plate through a connecting piece, and the connecting piece is made of stainless steel.
10. The exhaust gas recirculation butterfly valve of claim 1, wherein: the outer wall of the corrosion-resistant bushing is provided with an annular drawing groove along the circumferential direction, and the drawing groove is communicated to one axial end of the corrosion-resistant bushing.
11. The exhaust gas recirculation butterfly valve of claim 10, wherein: the drawing groove is communicated to the air inlet end of the corrosion-resistant bushing.
12. The exhaust gas recirculation butterfly valve of claim 1, wherein: the inner wall of one end of the corrosion-resistant lining, which is close to the air outlet of the channel, is in smooth transition connection with the inner wall of the channel.
13. The exhaust gas recirculation butterfly valve of claim 12, wherein: the inner wall of the channel is provided with a mounting groove, the mounting groove is communicated to the air inlet end of the channel, the corrosion-resistant bushing is mounted in the mounting groove, and the air outlet end of the corrosion-resistant bushing abuts against the side wall of the mounting groove, which is close to the air outlet end of the channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223207223.4U CN219081723U (en) | 2022-11-30 | 2022-11-30 | Exhaust gas circulation butterfly valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223207223.4U CN219081723U (en) | 2022-11-30 | 2022-11-30 | Exhaust gas circulation butterfly valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219081723U true CN219081723U (en) | 2023-05-26 |
Family
ID=86391070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223207223.4U Active CN219081723U (en) | 2022-11-30 | 2022-11-30 | Exhaust gas circulation butterfly valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219081723U (en) |
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2022
- 2022-11-30 CN CN202223207223.4U patent/CN219081723U/en active Active
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