Crossflow fan blade and crossflow fan

Abstract

The present invention discloses a crossflow fan and a crossflow fan, the crossflow fan comprises an end cover assembly, a shaft cover assembly and a plurality of middle section fan blades, the end cover assembly comprises an injection molded end cover, a shaft sleeve and a shock absorbing cloth, the shock absorbing cloth is embedded in the center of the injection molded end cover, the shaft sleeve is embedded in the center of the shock absorbing cloth; the shaft cover assembly comprises an injection molded shaft cover, a support shaft and an end blade, the end blade is fixedly connected to the end face of the injection molded shaft cover close to the middle section fan blade, the support shaft is embedded in the center of the injection molded shaft cover; the middle section fan blade comprises a middle section blade and a middle section mounting part, the middle section blade is fixedly connected to the end face of the middle section mounting part close to the injection molded end cover; the end blade is fixedly connected to the end face of the middle section mounting part close to the injection molded end cover, and the middle section blade is fixedly connected to the injection molded end cover. The crossflow fan blade avoids the phenomenon of stress concentration by changing its own connection structure, and improves the rigidity of its own structure.

Description

Technical Field

[0001] The invention relates to a fan blade structure and a fan, and in particular to a crossflow fan blade and a crossflow fan. Background Art

[0002] The existing crossflow fan blade is mainly composed of a middle fan blade, an end cover assembly and a shaft cover assembly. The three components are fixedly connected by serial ultrasonic welding. Figure 1 . Among them, the middle section fan blade is fixedly connected between the end cover assembly and the shaft cover assembly. In practical applications, different numbers of middle section fan blades can be applied according to actual needs to obtain cross-flow fan blades of different lengths. The end cover assembly is arranged on the side close to the motor, and is composed of injection molded blades, injection molded end covers and rubber cloth with embedded metal sleeves, wherein the metal sleeves are used for axial and radial fixation with the transmission shaft extending from the motor, the rubber material is used for shock absorption, and the injection molded blades can be used to adjust the length of the cross-flow fan blades to meet the length less than one middle section length. The shaft cover assembly is arranged at the other end away from the motor, and is mainly used to support the other end of the cross-flow fan blade. It is composed of a steel shaft embedded in the injection molded shaft cover. The end face of the injection molded shaft cover is provided with a welding groove for welding and fixing with the middle section fan blade. The steel shaft extends to the outside and is inserted into the bearing rubber ring.

[0003] Furthermore, in actual use, the two ends of the crossflow fan blade are subjected to relatively large forces; among them, since the rubber cloth is provided inside the end cover, the rubber cloth can reduce vibration and offset part of the force, and there is no welding groove on the end cover, so the end of the crossflow fan blade close to the end cover is not prone to breakage. However, since the shaft cover is only fixedly connected to the outside world through the embedded steel shaft, and the shaft cover is provided with a welding groove for welding with the middle section fan blade, the end of the crossflow fan blade close to the shaft cover is prone to breakage. Summary of the invention

[0004] The object of the present invention is to overcome the above-mentioned problems and provide a crossflow fan blade which avoids the stress concentration phenomenon and improves the rigidity of its structure by changing its own connection structure.

[0005] Another object of the present invention is to provide a cross-flow blower.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A crossflow fan blade comprises an end cover assembly, a shaft cover assembly and a plurality of middle section fan blades; the end cover assembly comprises an injection molded end cover, a shaft sleeve and a shock absorbing cloth, the shock absorbing cloth is embedded in the center of the injection molded end cover, and the shaft sleeve is embedded in the center of the shock absorbing cloth;

[0008] The shaft cover assembly includes an injection-molded shaft cover, a support shaft and end blades, wherein the end blades are fixedly connected to the end surface of the injection-molded shaft cover close to the middle section wind blade, and the support shaft is embedded in the center position of the injection-molded shaft cover;

[0009] The middle section wind blade comprises a middle section blade and a middle section mounting member, wherein the middle section blade is fixedly connected to the end surface of the middle section mounting member close to the injection molded end cover;

[0010] The end blades are connected to the end surface of the middle section mounting member close to the injection molded end cover through a fixed connection structure, and the middle section blades are connected to the injection molded end cover through a fixed connection structure, or are connected to the end surface of the adjacent middle section mounting member close to the injection molded end cover.

[0011] The working principle of the above crossflow fan blade is:

[0012] During operation, since the shaft cover assembly includes an injection molded shaft cover, a support shaft and an end blade, the injection molded shaft cover is first fixedly connected to the end blade (integrated injection molding), and then the end blade is fixed to the middle section mounting member by ultrasonic welding or the like. The middle section blade is connected to the end face of the adjacent middle section mounting member close to the injection molded end cover by ultrasonic welding or the like. According to actual needs, the corresponding number of middle section blades are welded in series in sequence. After reaching the required length, the middle section blade located at the end is then connected to the injection molded end cover by ultrasonic welding or the like. In the actual working process, at the end away from the motor, since the end blade is integrally molded with the injection molded shaft cover and has relatively good rigidity, it is not easily broken by external force. At the end close to the motor, although the injection molded end cover is fixed to the middle section blade by ultrasonic welding or the like in the later assembly process, since the injection molded end cover is embedded with a shock-absorbing cloth, the shock-absorbing cloth can offset part of the force during the rotating air supply process, reduce the stress at the connection between the injection molded end cover and the middle section blade, and thus protect the stability of the structure.

[0013] Furthermore, the matching modes of the sleeve and the motor include external fastening and internal fastening. The external fastening mode refers to the sleeve extending in the direction away from the middle section fan blade, and the output shaft of the motor is matched with the outside of the cross-flow fan blade. The internal fastening mode refers to the sleeve extending in the direction close to the middle section fan blade, and the output shaft of the motor is matched with the inside of the cross-flow fan blade. In the present invention, since the injection molding end cover eliminates the blade, during the injection molding process, only the injection molding end cover needs to be completed, and the injection molding end cover is a symmetrical part with a relatively simple structure. In this way, the relative position of the sleeve during injection molding can be switched according to the actual assembly requirements without changing the injection mold. If the assembly method is an external fastening method, before injection molding, the sleeve can be placed outside so that the sleeve after injection molding extends to the outside of the injection molded end cover relative to the middle section wind blade; similarly, if the assembly method is an internal fastening method, before injection molding, the sleeve can be placed inside so that the sleeve after injection molding extends to the inside of the injection molded end cover relative to the middle section wind blade; in this way, through a set of injection molds, the switching between the external fastening method and the internal fastening method can be easily realized, and the production cost is low.

[0014] In a preferred embodiment of the present invention, the end cover assembly, the shaft cover assembly and the middle section fan blade are fixedly connected by ultrasonic welding. Of course, they can also be connected by other fastening methods, such as snap-fitting, riveting and the like.

[0015] Preferably, a welding groove is provided on the end surface of the injection molded end cover close to the middle section fan blade; and a welding groove is provided on the end surface of the middle section mounting piece close to the injection molded shaft cover. With the above structure, when assembling and welding, the end blades are first aligned and inserted into the welding groove on the middle section mounting piece, and the middle section blade of the middle section fan blade is aligned and inserted into the welding groove of the adjacent middle section mounting piece or the welding groove on the injection molded end cover, and then the objects are fastened together by ultrasonic welding technology.

[0016] Furthermore, the number of the welding grooves on the injection-molded shaft cover is the same as the number of the middle-section blades of the middle-section wind blade, and the number of the welding grooves on the middle-section mounting piece is the same as the number of the end blades and the middle-section blades.

[0017] Furthermore, the welding groove on the middle section mounting piece is staggered with the middle section blade, which can prevent the middle section blades on both sides of the middle section mounting piece from being connected at the same position, avoid stress concentration, and improve structural rigidity.

[0018] In a preferred embodiment of the present invention, there are a plurality of middle-section wind blades, which are connected end to end between the injection-molded shaft cover and the injection-molded end cover.

[0019] In a preferred embodiment of the present invention, the injection-molded shaft cover and the end blades are integrally injection-molded; and the middle section blades and the middle section mounting piece are integrally injection-molded.

[0020] In a preferred embodiment of the present invention, the shock-absorbing fabric is made of rubber material.

[0021] In a preferred embodiment of the present invention, the sleeve extends linearly away from the middle section fan blade and cooperates with the output shaft of the motor. Through the above structure, the crossflow fan blade is connected to the motor in an external fastening manner to obtain the power of rotation.

[0022] In a preferred embodiment of the present invention, the sleeve extends linearly toward the middle section of the fan blade and cooperates with the output shaft of the motor. Through the above structure, the crossflow fan blade is connected to the motor in an internally fastened manner, thereby obtaining the power for rotation.

[0023] A crossflow fan comprises the crossflow fan blades and a motor.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention changes the traditional connection structure, cancels the blades on the injection-molded end cover, and newly sets blades on the injection-molded shaft cover to construct a new cross-flow fan blade in a reverse posture, thereby effectively avoiding the phenomenon of stress concentration and improving the rigidity of its own structure.

[0026] 2. In the present invention, since the injection molded end cover eliminates the blades, during the injection molding process, only the injection molded end cover needs to be completed, and the injection molded end cover is a symmetrical part with a relatively simple structure. In this way, the relative position of the sleeve during injection molding can be switched according to the actual assembly requirements without replacing the injection mold. If the assembly method is an external fastening method, before injection molding, the sleeve can be placed outside so that the sleeve after injection molding extends to the outside of the injection molded end cover relative to the middle section wind blade; similarly, if the assembly method is an internal fastening method, before injection molding, the sleeve can be placed inside so that the sleeve after injection molding extends to the inside of the injection molded end cover relative to the middle section wind blade; in this way, through a set of injection molds, the switching between the external fastening method and the internal fastening method can be easily realized, and the production cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional exploded view of a crossflow fan blade in the prior art.

[0028] Figure 2 It is a three-dimensional exploded view of one embodiment of the crossflow fan blade in the present invention.

[0029] Figure 3 It is a three-dimensional structural diagram of one embodiment of the crossflow fan blade in the present invention.

[0030] Figure 4It is a three-dimensional exploded view of another embodiment of the crossflow fan blade in the present invention.

[0031] Figure 5 It is a three-dimensional structural diagram of another embodiment of the crossflow fan blade in the present invention. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described below in conjunction with embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0033] join Figure 2-5 The crossflow fan blade in this embodiment includes an end cover assembly, a shaft cover assembly and a plurality of middle-section fan blades, and the plurality of middle-section fan blades are connected end to end between the end cover assembly and the shaft cover assembly. The end cover assembly includes an injection molded end cover 1, a shaft sleeve 2 made of a metal material and a shock-absorbing cloth 3 made of a rubber material, the shock-absorbing cloth 3 is embedded in the center of the injection molded end cover 1, and the shaft sleeve 2 is embedded in the center of the shock-absorbing cloth 3. The shaft cover assembly includes an injection molded shaft cover 4, a support shaft 5 and an end blade 6, the end blade 6 is integrally injection molded on the end surface of the injection molded shaft cover 4 close to the middle-section fan blade, and the support shaft 5 is embedded in the center of the injection molded shaft cover 4. The middle-section fan blade includes a middle-section blade 7 and a middle-section mounting member 8, and the middle-section blade 7 is integrally injection molded on the end surface of the middle-section mounting member 8 close to the injection molded end cover 1. The end blade 6 is connected to the end face of the middle section mounting member 8 close to the injection molded end cover 1 through a fixed connection structure, and the middle section blade 7 is connected to the injection molded end cover 1 through a fixed connection structure, or is connected to the end face of the adjacent middle section mounting member 8 close to the injection molded end cover 1.

[0034] Specifically, the end cover assembly, the shaft cover assembly and the middle section fan blade are fixedly connected by ultrasonic welding. Of course, they can also be connected by other fastening methods, such as snap-fitting, riveting and the like.

[0035] join Figure 2-5 The injection molded end cover 1 has a welding groove on its end surface close to the middle section wind blade; the middle section mounting part 8 has a welding groove on its end surface close to the injection molded shaft cover 4. With the above structure, when assembling and welding, the end blade 6 is first aligned and inserted into the welding groove on the middle section mounting part 8, and the middle section blade 7 of the middle section wind blade is aligned and inserted into the welding groove of the adjacent middle section mounting part 8 or the welding groove on the injection molded end cover 1, and then the objects are fastened together by ultrasonic welding technology.

[0036] Furthermore, the number of the welding grooves on the injection-molded shaft cover 4 is the same as the number of the middle-section blades 7 of the middle-section wind blade, and the number of the welding grooves on the middle-section mounting member 8 is the same as the number of the end blades 6 .

[0037] Furthermore, the welding groove on the middle section mounting member 8 is staggered with the middle section blade 7, so that the middle section blades 7 on both sides of the middle section mounting member 8 can be prevented from being connected at the same position, thus avoiding stress concentration and improving structural rigidity.

[0038] join Figure 2-3 The shaft sleeve 2 extends straightly away from the middle section fan blade and cooperates with the output shaft of the motor. Through the above structure, the crossflow fan blade is connected to the motor in an external fastening manner to obtain the power of rotation.

[0039] join Figure 4-5 The shaft sleeve 2 extends straightly toward the direction close to the middle section fan blade and cooperates with the output shaft of the motor. Through the above structure, the crossflow fan blade is connected to the motor in an internal fastening manner, thereby obtaining the power of rotation.

[0040] A cross-flow fan in this embodiment is arranged in an air conditioner or a fan (such as a household air conditioner, a special air conditioner, an air curtain air conditioner or a tower fan, etc.), and includes the cross-flow fan blades and a motor.

[0041] join Figure 2-5 The working principle of the crossflow fan blade in this embodiment is:

[0042] During operation, since the shaft cover assembly includes an injection molded shaft cover 4, a support shaft 5, and an end blade 6, the injection molded shaft cover 4 is first fixedly connected to the end blade 6 (integrated injection molding), and then the end blade 6 is fixed to the middle section mounting member 8 by ultrasonic welding or the like. The middle section blade 7 is connected to the end face of the adjacent middle section mounting member 8 close to the injection molded end cover 1 by ultrasonic welding or the like. According to actual needs, a corresponding number of middle section blades are welded in series in sequence. After reaching the required length, the middle section blade 7 at the end is then connected to the injection molded end cover 1 by ultrasonic welding or the like. In the actual working process, at the end far away from the motor, since the end blade 6 is integrally molded with the injection molded shaft cover 4 and has relatively good rigidity, it is not easily broken by external force. Located near the end away from the motor, although the injection molded end cover 1 is fixed to the middle section blade 7 by ultrasonic welding or the like in the later assembly process, since the injection molded end cover 1 has a shock-absorbing cloth 3 embedded therein, during the process of rotating air supply, the shock-absorbing cloth 3 can offset part of the force and reduce the stress at the connection between the injection molded end cover 1 and the middle section blade 7, thereby protecting the stability of the structure.

[0043] Furthermore, the matching modes of the shaft sleeve 2 and the motor include external fastening and internal fastening. The external fastening mode refers to the mode in which the shaft sleeve 2 extends away from the middle section fan blade, and the output shaft of the motor is matched with the outer side of the cross-flow fan blade. The internal fastening mode refers to the mode in which the shaft sleeve 2 extends toward the middle section fan blade, and the output shaft of the motor is matched with the inner side of the cross-flow fan blade. In the present invention, since the injection molding end cover 1 eliminates the blades, during the injection molding process, only the injection molding end cover 1 needs to be completed, and the injection molding end cover 1 is a symmetrical part with a relatively simple structure. In this way, the relative position of the shaft sleeve 2 during injection molding can be switched according to the actual assembly requirements without replacing the injection mold. If the assembly method is an external fastening method, such as Figure 2-3 Before injection molding, the sleeve 2 can be placed outside so that the sleeve 2 after injection molding extends to the outside of the injection molding end cover 1 relative to the middle section wind blade; similarly, if the assembly method is an internal fastening method, such as Figure 4-5 Before injection molding, the shaft sleeve 2 can be placed inwardly so that the shaft sleeve 2 after injection molding extends toward the inner side of the injection molded end cover 1 relative to the middle section wind blade; in this way, through a set of injection molds, the switching between the external fastening method and the internal fastening method can be easily realized, and the production cost is low.

[0044] The above is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited to the above content. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A crossflow fan blade, comprising an end cover assembly, a shaft cover assembly and a plurality of middle section fan blades; It is characterized in that The end cover assembly includes an injection molded end cover, a shaft sleeve and a shock absorbing cloth, wherein the shock absorbing cloth is embedded in the center of the injection molded end cover, and the shaft sleeve is embedded in the center of the shock absorbing cloth; The shaft cover assembly includes an injection-molded shaft cover, a support shaft and end blades, wherein the end blades are fixedly connected to the end surface of the injection-molded shaft cover close to the middle section wind blade, and the support shaft is embedded in the center position of the injection-molded shaft cover; The middle section wind blade comprises a middle section blade and a middle section mounting member, wherein the middle section blade is fixedly connected to the end surface of the middle section mounting member close to the injection molded end cover; The end blades are connected to the end face of the middle section mounting piece close to the injection molded end cover through a fixed connection structure, the middle section blades are connected to the injection molded end cover through a fixed connection structure, or are connected to the end face of the adjacent middle section mounting piece close to the injection molded end cover; the injection molded shaft cover and the end blades are integrally injection molded; the middle section blades and the middle section mounting piece are integrally injection molded.

2. The crossflow fan blade according to claim 1, It is characterized in that The end cover assembly, the shaft cover assembly and the middle section fan blade are fixedly connected by ultrasonic welding.

3. The crossflow blade according to claim 2, It is characterized in that A welding groove is provided on the end surface of the injection-molded end cover close to the middle-section wind blade; and a welding groove is provided on the end surface of the middle-section mounting piece close to the injection-molded shaft cover.

4. The crossflow fan blade according to claim 3, It is characterized in that The number of the welding grooves on the injection-molded shaft cover is the same as the number of the middle-section blades of the middle-section wind blade, and the number of the welding grooves on the middle-section mounting piece is the same as the number of the end blades.

5. The crossflow fan blade according to claim 3, It is characterized in that The welding groove on the middle section mounting piece is staggered with the middle section blade.

6. The crossflow fan blade according to claim 1, It is characterized in that There are a plurality of middle-section wind blades, which are connected end to end between the injection-molded shaft cover and the injection-molded end cover.

7. The crossflow fan blade according to claim 1, It is characterized in that The shaft sleeve extends linearly in a direction away from the middle-section fan blade and is matched with the output shaft of the motor.

8. The crossflow fan blade according to claim 1, It is characterized in that The shaft sleeve extends linearly toward the direction close to the middle fan blade and is matched with the output shaft of the motor.

9. A crossflow fan, It is characterized in that It comprises the crossflow fan blade and the motor as described in any one of claims 1 to 8.

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