CN112935518A - Method for manufacturing electric heating device of electric vehicle - Google Patents
Method for manufacturing electric heating device of electric vehicle Download PDFInfo
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- CN112935518A CN112935518A CN202110144859.XA CN202110144859A CN112935518A CN 112935518 A CN112935518 A CN 112935518A CN 202110144859 A CN202110144859 A CN 202110144859A CN 112935518 A CN112935518 A CN 112935518A
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- electric heating
- cover plate
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- heating apparatus
- heating body
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
- B23K20/122—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding
Abstract
Disclosed is a method of manufacturing an electric heating apparatus for an electric vehicle, the electric heating apparatus including: the electric heating device comprises an electric heating body, wherein a runner cavity is arranged on one side of the electric heating body; the cover plate is arranged on one side of the electric heating body and covers the flow passage cavity, and a supporting part is arranged in the flow passage cavity; the manufacturing method comprises the following steps: sealing: fixedly connecting the periphery of the cover plate with the electric heating body in a sealing way; a fixing step: the cover plate is fixedly connected with the supporting part at the middle part of the cover plate. According to the technical scheme of this application, with apron at the supporting part fixed connection of middle part with the electrical heating body to make this electrical heating equipment can bear bigger fluid medium's internal pressure, thereby possess higher reliability and leakproofness.
Description
Technical Field
The present invention relates to the field of electric heating, and more particularly, to a method of manufacturing an electric heating apparatus for an electric vehicle.
Background
Electric heating devices are widely used in motor vehicles, and generally heat a fluid medium through a heating unit, and then the fluid medium transfers heat to a heat dissipation system, so as to regulate the ambient temperature inside the vehicle. For example, for an electric automobile, the working efficiency of a battery circuit is reduced due to the influence of low temperature in winter, and the working temperature of the battery can be ensured by radiating heat around the battery through a fluid medium heated by the electric heating equipment.
In the electric heating apparatus, it is necessary to design a flow channel cavity for allowing a fluid medium to flow, and to arrange a heating unit, an electric control component, and the like, so that a high requirement is imposed on the sealing performance of the flow channel cavity of the electric heating apparatus. The conventional sealing method is usually to seal the peripheral part of the flow passage cavity, such as by using a sealing ring to cooperate with a fastener, or by using a sealant, but the conventional sealing method is complicated in structure and relatively high in sealing cost. On the other hand, the reliability of the conventional sealing method is limited, and particularly, after a period of use, the probability of the defect of the leakage of the seal is increased.
Therefore, how to provide a sealing solution for a flow channel cavity of an electric heating device with higher reliability becomes a technical problem to be solved in the field.
Disclosure of Invention
The inventor of the present application has found, through long-term research and development, that the sealing reliability of the flow passage chamber of the electric heating apparatus is limited because the peripheral seal of the flow passage chamber is assembled in a non-operating state, and in an operating state, the pressure of the fluid medium is alternately switched between a low-pressure state and a high-pressure state, and particularly, in a high-temperature state, the sealing cover structure in the middle of the flow passage chamber is bulged outwards, so that adverse stress is applied to the peripheral sealing structure, and the reliability of the peripheral sealing structure is reduced.
In view of the above, the present application provides a method for manufacturing an electric heating device of an electric vehicle, so as to provide a sealing scheme for a flow passage cavity of the electric heating device with higher reliability.
According to the present application, there is provided a method of manufacturing an electric heating apparatus for an electric vehicle, the electric heating apparatus including: the electric heating device comprises an electric heating body, wherein a runner cavity is arranged on one side of the electric heating body; the cover plate is arranged on one side of the electric heating body and covers the flow channel cavity, and a supporting part is arranged in the flow channel cavity; the manufacturing method comprises the following steps: sealing: fixedly connecting the periphery of the cover plate with the electric heating body in a sealing manner to form a first connecting part; a fixing step: and fixedly connecting the cover plate with the support part at the middle part of the cover plate.
Preferably, the fixing step is performed by friction stir welding, wherein a first stirring head in a rotating state is inserted into the supporting portion through the cover plate, so that the material of the contact portion of the cover plate and the supporting portion is softened and mixed, and a second connecting portion and a tail hole are formed after the first stirring head is withdrawn.
Preferably, the sealing step is performed by friction stir welding, in which a first stirring head in a rotating state is inserted between the peripheral edge of the cover plate and the electric heating body and moves along the peripheral edge for one turn, so that the materials of the contact part of the peripheral edge of the cover plate and the electric heating body are softened and mixed, and the first connection part and the tail hole are formed after the first stirring head is withdrawn.
Preferably, the manufacturing method includes a tail hole processing step in which a filler is filled into the tail hole, and the second stirring head in a rotating state is pressed against the filler to soften and fill the filler in the tail hole to form a seal.
Preferably, the rotation speed of the first stirring head and the second stirring head during operation is 1000-1500 rpm.
Preferably, the first pin includes a first shoulder and a first pin, the first pin is inserted into the support portion through the cover plate, and the first shoulder is pressed against an upper surface of the cover plate in the fixing step.
Preferably, the second stirring head comprises a second shoulder; or the second stirring head comprises a second shoulder and a second stirring pin, and the diameter and the length of the second stirring pin are smaller than those of the first stirring pin.
Preferably, the tail hole processing step includes a staying stage in which the second shoulder of the second stirring head in a rotating state is pressed down to a level flush with the top of the tail hole and a spin-down stage; and in the downward rotation stage, continuously pressing the second shaft shoulder downwards by 0.1-0.5mm at the height which is flush with the top of the tail hole.
Preferably, the duration of the spin-down phase is not less than 8 seconds.
Preferably, the support part is used for forming a runner wall in the runner cavity, and the fixing step includes: and after the first stirring head passes through the cover plate and is inserted into the supporting part, the first stirring head is horizontally moved along the extending direction of the supporting part, and after the first stirring head is drawn back, the tail hole is formed at the tail end of the moving path of the first stirring head.
According to the technical scheme of the application, compared with the traditional manufacturing method of the electric heating equipment, the electric heating body is fixedly connected with the periphery of the cover plate in a sealing mode, the middle of the cover plate is fixedly connected with the supporting portion of the electric heating body, so that the connecting strength of the electric heating body of the electric heating equipment and the cover plate is further increased, the pressure resistance of the electric heating equipment when the pressure of a fluid medium is greatly changed is further improved, and therefore the flow channel cavity of the electric heating equipment can have higher sealing reliability according to the manufacturing method of the electric heating equipment.
Additional features and advantages of the present application will be described in detail in the detailed description which follows.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate an embodiment of the invention and, together with the description, serve to explain the invention. In the drawings:
fig. 1 is a perspective view of an electric heating apparatus of an electric vehicle according to a preferred embodiment of the present application;
fig. 2, 5 and 6 are plan views illustrating an installation state of an electric heating body and a cover plate of an electric heating apparatus according to various embodiments;
FIG. 3 is a sectional view taken along line A-A of FIG. 2;
FIG. 4 is a schematic view of the electric heating body separated from the cover plate;
FIG. 7 is a sectional view taken along line B-B of FIG. 6;
FIG. 8 is a schematic cross-sectional view of an electrical heating apparatus after friction stir welding to form a first connection and a second connection;
FIG. 9 is a partial schematic view of the fitting state of the support portion and the cover plate in the flow passage chamber;
FIG. 10 is a partial schematic view of the peripheral edge of the cover plate of the electric heating apparatus in cooperation with the step structure;
FIG. 11 is a top view of the electric heating device with the tail hole untreated after friction stir welding the electric heating body and the cover plate;
FIG. 12 is a schematic view of the operation state of the structure for connecting the peripheral edge of the cover plate and the step by friction stir welding;
FIG. 13 is a schematic view of the cover plate and the support portion being connected by friction stir welding;
FIG. 14 is a schematic view of the placement of fill material into the tail hole;
FIG. 15 is a schematic view of friction stir welding of filler material into the tail holes.
Detailed Description
In an electric vehicle (e.g., a vehicle using electric energy as a main power source, such as a pure electric vehicle or a hybrid vehicle), an electric heating device is generally provided to achieve temperature control of an environment in the vehicle. This electrical heating equipment is connected with electric vehicle's power battery electricity, and the electricity device that generates heat among the electrical heating equipment is heat energy with electric energy conversion, passes through the interior cooling system of car via heat-conducting medium again and gives the car internal environment with heat transfer to the realization is to the temperature control of car internal environment. The heat-conducting medium is usually a fluid medium such as water and coolant, and the leakage of the fluid medium during the operation of the electric heating device can cause the failure of the electric device in the vehicle, so the sealing performance of the electric heating device is very important.
The electric heating equipment for the electric vehicle provided by the application is improved in a sealing structure and a sealing method of the electric heating equipment compared with the traditional technology, so that a sealing scheme of the electric heating equipment for the electric vehicle with higher sealing performance is provided.
The technical solutions of the present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
First, sealing structure
The present application provides an electric heating device of an electric vehicle, as shown in fig. 1, the electric heating device includes a housing for protecting the outside of the electric heating device, and a liquid inlet and a liquid outlet for the fluid medium to enter and exit the electric heating device, and an electric interface for connecting the vehicle circuits (control circuit, power supply circuit, etc.). In addition to the above structure, as an important point of the sealing structure of the electric heating apparatus, as shown in fig. 2 to 4, the electric heating apparatus further includes: an electric heating body 100, one side of the electric heating body 100 is provided with a flow channel cavity 110 which is communicated with the liquid inlet and the liquid outlet and is used for accommodating a fluid medium, and the other side is provided with an electric heating device which is electrically connected with the electric interface and is used for converting electric energy into heat energy; the cover plate 120 is arranged on one side of the electric heating body 100 and covers the runner cavity 110, and the periphery of the cover plate 120 is fixedly connected with the electric heating body 100 in a sealing way; wherein, the middle part of the cover plate 120 is fixedly connected with the electric heating body 100. It is understood that the central portion of the cover plate 120 may refer to any position on the cover plate 120 within a range surrounded by the periphery of the cover plate 120, and preferably, the central portion of the cover plate 120 refers to a region radiating outward from the geometric center of the cover plate 120, and the maximum distance between the edge of the region and the geometric center of the cover plate 120 is smaller than the minimum distance between the periphery of the cover plate 120 and the geometric center.
When the electric heating body and the cover framework of the existing electric heating device are sealed, only the connection between the periphery of the cover structure and the electric heating body is usually considered, and the pressure of the fluid medium can cause the cover structure in the middle of the flow passage cavity to bulge outwards, so that the reliability of the peripheral sealing structure is reduced. According to the above electric heating apparatus of the present application, the electric heating body 100 is fixedly connected to the periphery of the cover plate 120 in a sealing manner, so that the fluid medium can be confined in the flow channel cavity 110, and besides, compared with the existing electric heating apparatus, the middle part of the cover plate 120 is also fixedly connected to the electric heating body 100 in the present application, so as to increase the connection strength between the cover plate 120 and the electric heating body 100, further effectively improve the pressure resistance of the cover plate 120, and improve the reliability of the sealing structure, especially enhance the structural strength of the middle part of the cover plate 120, so as to offset the tendency that the fluid medium is pressed to bulge outwards.
According to the electric heating apparatus of the present application, the connection between the middle portion of the cover plate 120 and the electric heating body 100 may be achieved by means of bonding, welding, sealed screw connection, or the like. On the basis, the requirement on the hardness performance of the cover plate 120 and the electric heating body 100 is small, so that the cover plate 120 and the electric heating body 100 can be selected from various materials and structures, for example, the cover plate 120 and the electric heating body 100 can be made of metal materials such as aluminum alloy, the materials can be reduced as far as possible in structure, the cost is saved, and the electric heating equipment can be lightened. The periphery of the cover plate 120 and the electric heating body 100 may be fixed by bonding, welding, or fastening, and the sealing between the two may be formed by sealing means such as sealant, sealing ring, or fusion welding.
The open end of the runner cavity 110 may be provided with a structure matching the periphery of the cover plate 120 for supporting and positioning the cover plate 120 during the manufacturing process and during the use process of the electric heating apparatus, which may be a pin-and-slot positioning structure or a flange structure formed at the periphery of the cover plate 120, etc. Preferably, as shown in fig. 4, the open end of the flow channel chamber 110 is formed with a step structure 113, and the peripheral edge of the cover plate 120 is supported on the step structure 113, so that it is possible to easily position the cover plate 120 and the open end of the flow channel chamber during the manufacturing process of the device, and also to form a limitation of the degree of freedom of the cover plate by the vertical portion and the horizontal portion of the step structure 113 to improve the reliability of the connection structure.
The peripheral edge of the cover plate 120 and the step structure 113 may be fixed by bonding, welding, or fastening, or preferably, as shown in fig. 8, the peripheral edge of the cover plate 120 and the step structure 113 are fixedly connected by friction stir welding to form a first connection portion 121, and the first connection portion 121 at least includes a partial material of the peripheral edge of the cover plate 120 and a partial material of the step structure 113 mixed together by friction stir welding, so as to form an integrated sealing structure. According to the orientation shown in fig. 8, the depth of the first connection portion 121 from the upper surface of the cover plate 120 toward the flow path chamber 110 is less than the thickness of the cover plate 120, and the material mixed to form the first connection portion 121 includes the peripheral edge of the cover plate 120 and a part of the material of the vertical portion of the step structure 113; preferably, as shown in fig. 10, the peripheral edge of the cover plate 120 may be a flat right-angle structure, or may be provided with a flange 124 protruding downward, the flange 124 is supported on the step structure 113, and after the first connection portion 121 is formed, the depth of the first connection portion 121 is less than the thickness of the flange 124 and greater than the thickness of the rest of the cover plate 120.
On the premise of the fixed connection between the middle portion of the cover plate 120 and the electric heating body 100, as shown in fig. 8, a gap S in the vertical direction may exist between the stepped structure 113 and the cover plate 120, so that a floating margin in the vertical direction exists between the peripheral edge of the cover plate 120 and the horizontal portion of the stepped structure 113 before the first connection portion 121 is formed, so as to improve the yield of the manufacturing process of the electric heating apparatus. The size of the gap S may be 0-5% of the thickness of the cap plate 120. In another embodiment, in the case where the flange 124 protruding downward is provided at the periphery of the cap plate 120, if the thickness of the flange 124 in the vertical direction is greater than or equal to the depth of the first connection portion 121, the size of the gap S may be greater than 5% of the total thickness of the cap plate 120 and the flange 124, for example, the gap S may be 0 to 10% of the total thickness of the cap plate 120 and the flange 124, and preferably 0 to 5% of the total thickness of the cap plate 120 and the flange 124.
In order to realize the fixed connection between the middle part of the cover plate 120 and the electric heating body 100, the middle part of the cover plate 120 may be provided with at least one protruding structure facing the runner cavity 110 for connecting with the bottom surface of the runner cavity 110; or the cover plate 120 may be fixedly connected to the electric heating body 100 by a connector sealed through the middle of the cover plate 120; as shown in fig. 3, 4, 7 and 8, the flow path chamber 110 includes at least one support portion 114 extending upward from the bottom of the flow path chamber 110, and the top end of the support portion 114 is fixedly connected to the inner side surface (the surface facing the flow path chamber 110) of the cover plate 120 to form a second connection portion 122. The second connection portion 122 may be a connection structure fixed by a connection method such as bonding, welding or fastening, or preferably, as shown in fig. 8, the top end of the support portion 114 and the inner side surface of the cover plate 120 are fixedly connected by a friction stir welding method, the second connection portion 122 is a connection structure formed by mixing a part of the material of the middle portion of the cover plate 120 and a part of the material of the top end of the support portion 114 by a friction stir welding method, and the depth of the second connection portion 122 is greater than the thickness of the middle portion of the cover plate 120.
The supporting portion 114 may be a cylindrical body having a cross-sectional profile with an inscribed circle radius of 6 to 15mm, the cross-sectional profile may be a regular shape or an irregular shape, the regular shape may be a circle, an ellipse, a square, a regular pentagon, etc., and the irregular shape may be a non-regular polygon. The columnar supporting portion 114 may be a pillar extending vertically upward from the bottom of the flow path cavity 110; alternatively, the post-like support 114 may have other irregular shapes, such as a bent upwardly extending post or a post having an irregular cross-sectional shape. At this time, the second connecting portions 122 are distributed on the cover plate 120 as shown in fig. 5, and the second connecting portions 120 are distributed correspondingly according to the positions of the columnar supporting portions 114 below the cover plate 120. As shown in fig. 3 and 7, the supporting portion 114 may also be plate-shaped extending in the horizontal transverse direction or the longitudinal direction, and the distribution of the second connection portions 122 may be uniform point distribution as shown in fig. 5, or the second connection portions 122 may also extend in the extending direction of the plate-shaped supporting portion 114 as shown in fig. 2 or 6. Wherein the plate-shaped supporting portion 114 is in the flow channel cavity 110, and the supporting portion 114 may be a flow channel wall for forming the flow channel cavity 110; or the support portion 114 is spaced apart from the flow path wall of the flow path chamber 110. According to the electric heating apparatus of the electric vehicle in the above embodiment, the second connection part 122 is preferably plural to provide support for more connection strength between the cover plate 120 and the electric heating body 100. The horizontal cross-sections of the second connecting portions 122 may be regular or irregular round or strip-shaped, and the round or strip-shaped second connecting portions 122 are distributed at intervals in the middle of the cover plate 120.
According to the electric heating apparatus for an electric vehicle of the present application, in the manufacturing process of the electric heating apparatus, the cover plate 120 is first required to be covered on the flow passage cavity 110, and then the cover plate 120 is fixedly connected to the supporting portion 114 through the middle portion of the cover plate 120. Therefore, it is preferable that the upper surface of the cover plate 120 is provided with a marker corresponding to the position of the supporting part 114, and the marker may be a pattern drawn on the upper surface of the cover plate 120; or the markers are preferably grooves 123 as shown in fig. 9, and the second connecting portions 122 are distributed in the grooves 123. The relative position of the supporting portion 114 is determined according to the pattern or groove 123 of the upper surface of the cap plate 120 during the manufacturing process, thereby improving the accuracy of sealing.
As shown in fig. 9, the top end of the supporting portion 114 is preferably provided with a rib 115 protruding upward, and the inner side surface (the surface facing the supporting portion 114) of the cover plate 120 is preferably provided with a locking groove 125 matching with the rib 115. Through the cooperation of this strengthening rib 115 and draw-in groove 125, can play the positioning action to apron 120 and supporting part 114 on the one hand, on the other hand, in the in-process that forms second connecting portion 122, the strengthening rib 115 and the draw-in groove 125 that mutually support more easily form comparatively reliable connection through friction stir welding. The reinforcing ribs 115 may be disposed on the lower surface of the cover plate 120, and at the same time, the top end of the supporting portion 114 is provided with a matching locking groove 125. The cross-sectional shape of the rib 115 and the groove 125 may be rectangular as shown in fig. 9, or may be triangular or trapezoidal.
According to the electric heating apparatus as described in the foregoing, a heating element for converting electric energy into thermal energy, preferably a resistance heating element, and an electronic control device for controlling the heating element are provided on the electric heating body 100. In order to provide the above electronic control device and the resistance heating element with a stable working environment, as shown in fig. 1, the electric heating apparatus of the present application preferably further includes: a first housing 130, wherein the first housing 130 is installed at one side of the electric heating body 100, and forms a sealed cavity with the cover plate 120 for installing an electronic control device; and a second case 140, the second case 140 being installed at the other side of the electric heating body 100 and forming a sealed cavity for accommodating the resistance heating element with the electric heating body 100. The first housing 130 and the second housing 140 may be fixedly connected to the electric heating body 100 by bonding, welding, fastening members, and sealing rings. Or preferably, the edges of the first and second housings 130 and 140 are fixedly connected with the electric heating body 100 by friction stir welding to achieve sealing and fixing at the same time.
The application also provides an electric vehicle, and the electric vehicle can comprise the electric heating device in any one of the above embodiments, so that the electric vehicle has relatively safe and reliable vehicle thermal management performance. The electric vehicle may be a new energy vehicle that uses electric energy as a main driving energy, such as a pure electric vehicle or a hybrid vehicle.
Second, sealing method
According to the foregoing, the sealing structure of the electric heating apparatus for an electric vehicle according to various embodiments is provided, and the central portion and the peripheral portion of the cover plate 120 are fixedly connected to the electric heating body 100 in different structures, so that the electric heating apparatus has a more robust and reliable fluid sealing structure. Next, according to the electric heating apparatus as described in the foregoing, the present application provides a method for manufacturing the electric heating apparatus of the electric vehicle.
The present application provides a manufacturing method of an electric heating apparatus of an electric vehicle, which applies an electric heating apparatus at least comprising an electric heating body 100 and a cover plate 120 as described in the previous embodiments, wherein one side of the electric heating body 100 is provided with a flow channel cavity 110, the cover plate 120 is provided at one side of the electric heating body 100 and covers the flow channel cavity 110, and a support portion 114 is provided in the flow channel cavity 110. The method for manufacturing an electrolytic thermal device of the present application includes: sealing: fixedly connecting the periphery of the cover plate 120 with the electric heating body 100 in a sealing manner to form a first connecting part; a fixing step: the cover plate 120 is fixedly coupled to the support portion 114 at the middle portion thereof. Wherein, the sealing step is to seal the flow channel cavity 110 between the cover plate 120 and the electric heating body 100, and the fixing step is to add a fixed connection structure with the support part 114 on the electric heating body 100 in the middle of the cover plate 120, so as to fix the cover plate 120 and the electric heating body 100 and enhance the connection relationship. The sealing step and the fixing step may be performed either before or after each other, or both.
The fixing of the cover plate 120 and the supporting portion 114 in the fixing step may be achieved by bonding, welding, sealed screwing, and the like as described above. However, since it is difficult to perform the connecting operation of the cover plate 120 and the supporting portion 114 after the cover plate 120 is engaged with the electric heating body 100, the fixing step preferably performs the friction stir welding of the cover plate 120 and the supporting portion 114 by means of friction stir welding through the cover plate 120. As shown in fig. 13, the first stirring head 31 in a rotating state is inserted into the supporting portion 114 through the cover plate 120, the materials of the contacting portion of the cover plate 120 and the supporting portion 114 are softened and mixed by the rotating friction of the first stirring head 31, and after the first stirring head 31 is withdrawn, the softened and mixed materials are cooled to form the second connecting portion 122 and the tail hole 1221 shown in fig. 11 and 14.
In addition, the fixing between the peripheral edge of the cover plate 120 and the electric heating body 100 in the sealing step may be achieved by bonding, welding, or screw-fastening of sealing as described above, or preferably, the sealing step may be achieved by friction stir welding, specifically, as shown in fig. 11 and 12, the first stirring tip 31 in a rotating state is inserted between the peripheral edge of the cover plate 120 and the electric heating body 100 and moves one round along the peripheral edge, so that the material of the contact portion between the peripheral edge of the cover plate 120 and the electric heating body 100 is softened and mixed, and after the first stirring tip 31 is withdrawn, the softened and mixed material is cooled to form the first connection portion 121 and the tail hole 1221 shown in fig. 11 and 14.
The above preferred fixing step and sealing step may be alternative or combined, that is, preferably, both the fixing step and the sealing step are performed by friction stir welding. After the friction stir welding operation is completed and the first stirring head 31 is withdrawn, in order to avoid the remaining end hole 1221 from affecting the sealing performance of the electric heating apparatus, preferably, the manufacturing method includes an end hole processing step, in the end hole processing step, first, as shown in fig. 14, a filler 33 is filled into the end hole 1221, the filler 33 may be a material having a melting point close to or the same as that of the cover plate 120 and the electric heating body 100, or the filler 33 is preferably the same as that of the cover plate 120 and the electric heating body 100; then, as shown in fig. 15, the second stirring head 32 in a rotating state is pressed against the filler 33, and the filler 33 is softened by the rotation stirring friction of the second stirring head 32 and filled in the end hole 1221 to form a seal. The second stirring head 32 has a smaller friction stir range than the first stirring head 31. According to the above method for manufacturing the electric heating apparatus for an electric vehicle, the rotation speed of the first stirring head 31 and the second stirring head 32 during operation can be 1000-.
In the above method for manufacturing an electric heating apparatus, as shown in fig. 12 and 13, the first pin 31 preferably includes a first shoulder 310 and a first pin 311, and the first shoulder 310 and the first pin 311 may be detachable to adapt to various working environments; or may be integrally formed to provide better concentricity between the first shoulder 310 and the first pin 311. In the fixing step, the first pin 311 is inserted into the supporting portion 114 through the cover plate 120, and the first shoulder 310 is pressed against the upper surface of the cover plate 120. The second pin 32 may include only the second shoulder 320, and the cross-sectional area of the second shoulder 320 may be the same as or different from that of the first shoulder 310, or the second shoulder 320 may be the first shoulder 310 of the first pin 31 without the first pin 311; or as shown in fig. 15, the second pin 32 may include a second shoulder 320 and a second pin 321, where one of the diameter and the length of the second pin 321 is smaller than that of the first pin 311, and the other is not larger than that of the first pin 311, and preferably, both the diameter and the length of the second pin 321 are smaller than those of the first pin 311.
According to the tail hole processing step in the manufacturing method of the electric heating apparatus as described above, the second stirring head 32 compacts the filler 33 filled in the tail hole 1221, and the filler 33 is softened by the rotating action of the second stirring head 32 and sufficiently bonded to the hole wall of the tail hole 1221, so that the tail hole 1221 is plugged. Preferably, the tail hole processing step includes a staying stage and a downward rotating stage of the second stirring head 32. Wherein, in the staying stage, the second shoulder 320 of the second stirring head 32 in the rotating state is pressed down to a level flush with the top of the tail hole 1221, and the second stirring head 32 stays at the position for a certain time to soften the material near the second stirring head 32 to a proper degree by the rotating friction; in the downward rotation stage, the second shoulder 320 is continuously pressed downward by 0.1-0.5mm, preferably 0.1-0.3mm, at a height level with the top of the tail hole 1221, so that the filling material 33 is fully compacted in the tail hole 1221, and air bubbles are prevented from affecting the sealing performance. Preferably, the duration of the spin-down phase is not less than 8 seconds to allow the softened material to be thoroughly mixed.
The method of manufacturing an electric heating apparatus for an electric vehicle according to any of the above embodiments can be applied to the manufacturing process of the electric heating apparatus for an electric vehicle according to any of the above embodiments. In the case where the support portion 114 is used to form a runner wall in the runner cavity 110, the fixing step preferably includes: after the first stirring head 31 is inserted into the supporting part 114 through the cover plate 120, the first stirring head 31 is horizontally moved along the extending direction of the supporting part 114 to form a second connecting part 122 in a strip shape as shown in fig. 2 or fig. 6; after the first stirring head 31 is withdrawn, a tail hole 1221 as shown in fig. 11 is formed at the end of the moving path of the first stirring head 31, that is, the end of the second connecting portion 122 having a long shape. The tail hole 1221 is then further plugged using the tail hole processing steps of any of the embodiments described above.
According to the technical scheme of the application, through the connecting structure formed by the middle part of the cover plate 120 and the electric heating body 100, the connecting strength between the electric heating body of the electric heating device and the cover plate is increased, and further the pressure resistance of the electric heating device when the pressure of a fluid medium is greatly changed is improved, so that the electric heating device of the electric vehicle with high sealing performance and the manufacturing method for the electric heating device, particularly the sealing structure of the electric heating device are provided.
The preferred embodiments of the present application have been described in detail above, but the present application is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present application within the technical idea of the present application, and these simple modifications all belong to the protection scope of the present application.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described in the present application.
In addition, any combination of the various embodiments of the present application is also possible, and the same should be considered as disclosed in the present application as long as it does not depart from the idea of the present application.
Claims (10)
1. A method of manufacturing an electric heating apparatus for an electric vehicle, the electric heating apparatus comprising:
the electric heating device comprises an electric heating body (100), wherein a runner cavity (110) is arranged on one side of the electric heating body (100);
a cover plate (120), wherein the cover plate (120) is arranged on one side of the electric heating body (100) and covers the flow channel cavity (110), and a support part (114) is arranged in the flow channel cavity (110);
characterized in that the manufacturing method comprises:
sealing: fixedly connecting the periphery of the cover plate (120) with the electric heating body (100) in a sealing manner to form a first connecting part;
a fixing step: the cover plate (120) is fixedly connected with the support part (114) at the middle part thereof.
2. The method of manufacturing an electric heating apparatus for an electric vehicle according to claim 1, wherein the fixing step is performed by friction stir welding in which a first stirring tip (31) in a rotating state is inserted into the support portion (114) through the cover plate (120), the material of the contact portion of the cover plate (120) and the support portion (114) is softened and mixed, and a second connection portion (122) and a tail hole (1221) are formed after the first stirring tip (31) is withdrawn.
3. The method of manufacturing an electric heating apparatus for an electric vehicle according to claim 1, wherein the sealing step is performed by friction stir welding in which a first stirring pin (31) in a rotating state is inserted between a peripheral edge of the cover plate (120) and the electric heating body (100) and moved along the peripheral edge by one turn, so that materials of a contact portion of the peripheral edge of the cover plate (120) and the electric heating body (100) are softened and mixed, and the first connection portion (121) and the tail hole (1221) are formed after the first stirring pin (31) is withdrawn.
4. The manufacturing method of the electric heating apparatus for electric vehicle according to claim 2 or 3, characterized in that the manufacturing method includes a tail hole processing step in which a filling material (33) is filled into the tail hole (1221), a second stirring head (32) in a rotating state is pressed against the filling material (33), and the filling material (33) is softened and filled in the tail hole (1221) to form a seal.
5. The method for manufacturing an electric heating device for an electric vehicle as claimed in claim 4, characterized in that the first stirring head (31) and the second stirring head (32) are operated at a speed of 1000 and 1500 revolutions per minute.
6. The manufacturing method of an electric heating apparatus of an electric vehicle according to claim 2, characterized in that the first stirring head (31) includes a first shoulder (310) and a first stirring pin (311) which are integrally formed,
in the fixing step, the first probe (311) is inserted into the support portion (114) through the cover plate (120), and the first shoulder (310) is pressed against the upper surface of the cover plate (120).
7. The manufacturing method of an electric heating apparatus of an electric vehicle according to claim 4,
the second pin (32) comprises a second shoulder (320); or
The second stirring head (32) comprises a second shaft shoulder (320) and a second stirring pin (321), and the diameter and the length of the second stirring pin (321) are smaller than those of the first stirring pin (311).
8. The manufacturing method of an electric heating apparatus of an electric vehicle according to claim 7, wherein the tail hole processing step includes a stay stage and a spin-down stage,
during the dwell phase, the second shoulder (320) of the second stirring head (32) in rotation is pressed down to a level flush with the top of the tail hole (1221);
and in the downward rotation stage, continuously pressing the second shaft shoulder (320) downwards by 0.1-0.5mm at the height which is flush with the top of the tail hole (1221).
9. The manufacturing method of an electric heating apparatus of an electric vehicle according to claim 8, characterized in that the duration of the spin-down phase is not less than 8 seconds.
10. The manufacturing method of an electric heating apparatus for an electric vehicle according to claim 2, wherein the support portion (114) is used to form a runner wall in the runner cavity (110), and the fixing step includes:
after the first stirring head (31) is inserted into the supporting part (114) through the cover plate (120), the first stirring head (31) is horizontally moved along the extending direction of the supporting part (114), and after the first stirring head (31) is drawn back, the tail hole (1221) is formed at the tail end of the moving path of the first stirring head (31).
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| CN202110144859.XA CN112935518A (en) | 2021-02-02 | 2021-02-02 | Method for manufacturing electric heating device of electric vehicle |
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| CN202110144859.XA CN112935518A (en) | 2021-02-02 | 2021-02-02 | Method for manufacturing electric heating device of electric vehicle |
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