Connecting structure capable of preventing relative rotation of blower impeller

Abstract

The utility model provides a connecting structure capable of preventing relative rotation of an air blower impeller. The connecting structure comprises the impeller and a motor shaft which are installed in a matched mode. The motor shaft is provided with a slotted hole in the axial direction, a push rod, an elastic piece and a clamping piece are arranged in the slotted hole, the side wall of the motor shaft is provided with a first through hole in the radial direction, the first through hole is communicated with the slotted hole, the clamping piece is movably arranged in the first through hole, and one end of the clamping piece is connected with the push rod. One end of the elastic piece abuts against the inner wall of the groove hole, and the other end abuts against the push rod. The push rod is matched with the elastic piece and can radially move in the slotted hole; in the initial state, the elastic piece pushes the push rod, the push rod pushes the clamping piece to move in the radial direction, and the other end of the clamping piece extends out of the motor shaft through the first through hole. During installation, the impeller is inserted into the motor shaft and pushes the clamping piece, the clamping piece retracts into the first through hole, and the push rod radially compresses the elastic piece to provide space for retraction of the clamping piece; the moving direction of the clamping piece is perpendicular to the inserting direction of the impeller. A clamping groove is formed in the mounting hole of the impeller; when the impeller is inserted into the motor shaft, the clamping piece is clamped with the clamping groove.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal blower technology, and in particular to a connection structure that can prevent relative rotation of blower impellers. Background Technology

[0002] Traditional Roots blowers, due to their strong vibration, high noise, and high energy consumption, have been gradually replaced in the market by high-quality centrifugal blowers, leading to a growing demand for centrifugal aerators. However, centrifugal aerators, due to their high speed, complex operating conditions, low cost, and few auxiliary parts, are prone to instability during operation. Even slight displacement of the impeller from the motor shaft can easily cause damage to the impeller and impeller cover, resulting in serious consequences such as motor shaft breakage and bearing failure. Therefore, preventing relative rotation and displacement between the impeller and motor shaft is of paramount importance in the design.

[0003] Currently, the common practices to prevent relative displacement between the impeller and the motor shaft are: one is to use an intermediate fit between the impeller and the motor shaft, then lock the nut, and calculate the axial force during the aerodynamic design stage. However, the intermediate fit and locking the nut cannot guarantee that the two will not be displaced relative to each other, and the aerodynamic axial force calculation cannot cover a variety of working conditions; the other is to use an end face tooth fit at the end face where the impeller and the motor shaft contact, but the end face tooth is difficult to machine. Utility Model Content

[0004] The present invention aims to solve the problem of relative rotation and displacement between the impeller and the motor shaft in the prior art, and provides a connection structure that can prevent relative rotation of the blower impeller, improve the stability of the centrifugal blower, and reduce the failure rate of the machine.

[0005] To solve the above-mentioned technical problems, this utility model provides a connection structure that can prevent relative rotation of blower impellers, including an impeller and a motor shaft that are installed together; the motor shaft has a slot at one end for mounting the impeller, and the slot is arranged axially.

[0006] The slot is provided with a push rod, an elastic element and a locking element, with the elastic element and the locking element arranged opposite each other on both sides of the push rod;

[0007] The side wall of the motor shaft is provided with a first through hole in the radial direction. The first through hole communicates with the slot hole. The clamp is movably placed in the first through hole. One end of the clamp is connected to the push rod.

[0008] One end of the elastic element abuts against the inner wall of the slot, and the other end abuts against the push rod; the push rod and the elastic element cooperate to move radially within the slot;

[0009] In the initial state, the elastic element pushes the push rod, the push rod pushes the locking member to move radially, and the other end of the locking member extends out of the first through hole and partially protrudes from the motor shaft;

[0010] During installation, the impeller is inserted into the motor shaft axially, the impeller pushes against the retaining member, the retaining member retracts into the first through hole, and the push rod radially compresses the elastic element to provide space for the retaining member to retract;

[0011] The impeller has a slot in its mounting hole; when the impeller is inserted into the slot and faces the retaining element, the push rod pushes out the retaining element under the action of the elastic element, and the retaining element engages with the slot.

[0012] In a preferred embodiment, the portion of the clip protruding from the motor shaft is provided with a guide slope, which engages with the mounting hole to guide the clip to retract.

[0013] In a preferred embodiment, the connection between the clip and the push rod is a threaded connection.

[0014] In a preferred embodiment, the push rod is connected to an unlocking member, which is disposed on the same side as the locking member. An external force is applied to the unlocking member to drive the push rod to compress the elastic member and cause the locking member to retract into the first through hole, thereby releasing the locking member from the locking slot.

[0015] In a preferred embodiment, the elastic element includes a plurality of springs, with at least one spring provided at the position corresponding to the locking element and at least two springs provided at the position corresponding to the unlocking element;

[0016] The number of springs corresponding to the unlocking component position is greater than the number of springs corresponding to the locking component position.

[0017] In a preferred embodiment, the unlocking component includes a plurality of pins, and a spring is provided at the position of each pin; the sidewall of the motor shaft is provided with a plurality of second through holes in the radial direction, and the second through holes are arranged axially above the first through holes;

[0018] Each of the aforementioned pins corresponds to one of the second through holes, and the pins pass through the second through holes to connect with the push rod; the connection between the pins and the push rod is a threaded connection.

[0019] In a preferred embodiment, the unlocking element further includes a cover plate for connecting a plurality of the pins; the cover plate covers the ends of the pins and is exposed outside the motor shaft to receive external pressing pressure.

[0020] In a preferred embodiment, the impeller is transitionally fitted to the motor shaft; the impeller passes through the motor shaft, the lower end of the impeller engages with the convex surface of the motor shaft, and the upper end of the impeller is secured with a nut, which is threadedly connected to the motor shaft.

[0021] In a preferred embodiment, the two sides of the push rod are flat and contact the elastic element, the locking element, and the unlocking element, respectively.

[0022] In a preferred embodiment, a plurality of slots are distributed circumferentially on the motor shaft.

[0023] Compared with the prior art, the technical solution of this utility model has the following beneficial effects:

[0024] 1. Prevent relative rotation of the impeller: The clamping mechanism effectively prevents relative rotation and displacement between the impeller and the motor shaft, thus improving the stability and reliability of the blower operation.

[0025] 2. Simplified installation and disassembly: During installation, the impeller is automatically engaged with the impeller slot by inserting it into the motor shaft, without the need for additional tools; during disassembly, the engagement can be quickly released using the unlocking mechanism, greatly simplifying the maintenance process and reducing maintenance costs and time.

[0026] 3. Compact structure and high reliability: The connection structure is ingeniously designed. The cooperation between the elastic element and the locking element ensures the stability of the locking. At the same time, the design of the unlocking element provides reliable disassembly guarantee. The overall structure is compact and highly adaptable.

[0027] 4. High adaptability: It is suitable for connecting blower impellers of different sizes and types to motor shafts, and has wide applicability.

[0028] 5. Improve service life: The snap-fit ​​between the clip and the slot can be further used in conjunction with the impeller nut locking mechanism. By reducing the relative movement between the impeller and the motor shaft, wear caused by vibration and impact is reduced, thereby extending the service life of the blower. Attached Figure Description

[0029] Figure 1 This is a cross-sectional view of the connection structure between the blower impeller and the motor shaft in the first embodiment of this utility model;

[0030] Figure 2 This is a connection structure diagram in the first embodiment of the present invention that prevents relative rotation of the blower impeller;

[0031] Figure 3 This is a top view of the push rod installed in the slot in the first embodiment of this utility model;

[0032] Figure 4This is a top view of the push rod in the first embodiment of this utility model;

[0033] Figure 5 This is a schematic diagram showing the positions of the impeller slot and the motor shaft hole slot in the first embodiment of this utility model.

[0034] Figure 6 This is a schematic diagram of the installation of the push rod, unlocking component, and locking component in the first embodiment of this utility model;

[0035] Figure 7 This is a schematic diagram of the blower structure in the first embodiment of the present invention.

[0036] Explanation of reference numerals in the attached drawings: 1. Motor shaft; 11. Slot; 12. First through hole; 13. Second through hole; 14. Spring mounting slot; 2. Impeller; 21. Slot; 3. Push rod; 31. Flat surface; 4. Elastic element; 41. Single spring structure; 42. Double spring structure; 5. Clamping element; 51. Guide slope; 6. Threaded connection; 7. Unlocking element; 71. Pin; 72. Cover plate. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0038] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed", "equipped with", "sleeved / connected", "connected", etc., should be interpreted broadly. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0040] First embodiment, reference Figures 1-7 .

[0041] This embodiment provides a connection structure that prevents relative rotation of the blower impeller 2, including an impeller 2 and a motor shaft 1 that are installed together; the end of the motor shaft 1 for mounting the impeller 2 is provided with a slot 11 (e.g., Figure 5 The slot 11 is arranged axially; a push rod 3, an elastic element 4, and a retaining element 5 (such as...) are provided inside the slot 11. Figure 2 The elastic element 4 and the locking element 5 are disposed opposite each other on both sides of the push rod 3; a first through hole 12 is radially opened on the side wall of the motor shaft 1, the first through hole 12 communicates with the slot 11, the locking element 5 is movably placed in the first through hole 12, and one end of the locking element 5 is connected to the push rod 3; one end of the elastic element 4 abuts against the inner wall of the slot 11, and the other end abuts against the push rod 3; the push rod 3 and the elastic element 4 cooperate in the slot 11 and can move radially; in the initial state, the elastic element 4 pushes the push rod 3, and the push rod 3 pushes the locking element 5 radially. During operation, the other end of the retaining member 5 extends out of the first through hole 12 and partially protrudes from the motor shaft 1; during installation, the impeller 2 is inserted axially into the motor shaft 1, the impeller 2 pushes the retaining member 5, and the retaining member 5 retracts into the first through hole 12. The push rod 3 radially compresses the elastic element 4 to provide space for the retaining member 5 to retract; a retaining groove 21 is provided in the mounting hole of the impeller 2; when the impeller 2 is inserted into the retaining groove 21 and is opposite to the retaining member 5, the push rod 3 pushes out the retaining member 5 under the action of the elastic element 4, and the retaining member 5 engages with the retaining groove 21 (e.g., Figure 2 ).

[0042] The connection structure provided in this embodiment features a slot 11 at the end of the motor shaft 1, within which a push rod 3, an elastic element 4, and a locking element 5 are installed. The locking element 5 engages with the elastic element 4 via the push rod 3 to achieve radial telescopic movement. A slot 21 is provided on the impeller 2. When the impeller 2 is installed with the motor shaft 1, the telescopic movement of the locking element 5 engages with the slot 21, thereby locking the motor shaft 1 and the impeller 2 and limiting their relative rotation and displacement.

[0043] By engaging the clip 5 with the slot 21 of the impeller 2, and by cooperating with the push rod 3 and the elastic shear, the relative rotation and displacement between the impeller 2 and the motor shaft 1 are effectively prevented, thereby improving the stability and reliability of the blower operation.

[0044] The portion of the clip 5 that protrudes from the motor shaft 1 is provided with a guide slope 51 (e.g., ...). Figure 6The guide slope 51 engages with the mounting hole to guide the retraction of the clamp 5. The guide slope 51 is oriented towards the direction of impeller 2 insertion. When the impeller 2 is inserted axially into the motor shaft 1, the mounting hole of the impeller 2 engages with the guide slope 51 of the clamp 5, applying a radially inward force to the clamp 5, causing it to retract radially into the first through hole 12, thus facilitating the insertion of the impeller 2.

[0045] like Figure 6 The connection between the clip 5 and the push rod 3 is a threaded connection 6. The clip 5 and the push rod 3 form a detachable connection via the threaded connection 6. When the push rod 3 is inserted into the slot 11, the clip 5 is not connected to the push rod 3, facilitating the insertion of the push rod 3. After the push rod 3 is inserted, the connection positions of the push rod 3 and the clip 5 are aligned. The clip 5 passes through the first through hole 12 and is threadedly connected to the push rod 3 6, thus completing both the connection between the push rod 3 and the clip 5 and the assembly of the clip 5 with the first through hole 12, ensuring the reliability and adjustability of the connection.

[0046] like Figure 6 The connection structure also includes an unlocking component 7, which is connected to the push rod 3. The unlocking component 7 and the locking component 5 are located on the same side. When an external force is applied to the unlocking component 7, the push rod 3 is driven to compress the elastic element 4, and the locking component 5 is driven to retract into the first through hole 12, thus releasing the locking component 5 from the slot 21. During installation, the impeller 2 can be automatically engaged by inserting it into the motor shaft 1; during disassembly, the locking component 7 can quickly release the engagement without additional tools, greatly simplifying the maintenance process and reducing maintenance costs and time.

[0047] The elastic element 4 includes several springs, with at least one spring corresponding to the position of the locking element 5 and at least two springs corresponding to the positions of the unlocking element 7. The number of springs corresponding to the unlocking element 7 is greater than the number of springs corresponding to the positions of the locking element 5. The greater number of springs at the unlocking element 7 than at the locking element 5 ensures reliability during unlocking.

[0048] like Figure 2 In this embodiment, a double-spring structure 42 is used at the unlocking part 7 and a single-spring structure 41 is used at the locking part 5. The push rod 3 and the unlocking part 7 are equipped with two springs to ensure that the push rod 3 can move in parallel when pressed, so as to drive the locking part 5 to retract smoothly. This design can avoid the locking failure problem caused by the tilt of the push rod 3, and ensure that the locking part 5 can accurately engage or disengage with the slot 21 of the impeller 2, further improving the reliability of the connection and the convenience of unlocking.

[0049] Specifically, the unlocking component 7 includes a plurality of pins 71, and a spring is provided at the position of each pin 71; the side wall of the motor shaft 1 is provided with a plurality of second through holes 13, and the second through holes 13 are arranged axially above the first through hole 12; each pin 71 is provided with a second through hole 13, and the pin 71 passes through the second through hole 13 and is connected to the push rod 3; the connection between the pin 71 and the push rod 3 is a threaded connection 6, ensuring the reliability and adjustability of the connection.

[0050] To facilitate the pressing operation of the unlocking component 7, the unlocking component 7 further includes a cover plate 72 for connecting a plurality of the pins 71; the cover plate 72 covers the ends of the pins 71, and the cover plate 72 is exposed outside the motor shaft 1 (e.g., Figure 3 (), used to receive external pressure.

[0051] In this embodiment, a dual locking mechanism is adopted to significantly improve stability. Specifically, the impeller 2 is transitionally fitted with the motor shaft 1; the impeller 2 is inserted into the motor shaft 1, the lower end of the impeller 2 is fitted with the convex surface of the motor shaft 1, and the upper end of the impeller 2 is locked with a nut, which is threadedly connected to the motor shaft 1.

[0052] Through transition fit and nut tightening, the impeller 2 and motor shaft 1 are initially fixed by friction, serving as the first line of defense. Based on this, the mechanical locking mechanism composed of push rod 3 and clamp 5 further restricts the axial and circumferential movement of the impeller 2, forming the second line of defense. This dual locking mechanism effectively prevents the impeller 2 from relative rotation or displacement due to vibration or impact during operation, significantly improving the operational stability and reliability of the blower.

[0053] Meanwhile, the cleverly designed push rod 3 and locking mechanism 5 make the installation and disassembly of the impeller 2 extremely convenient. During assembly, the impeller 2 can easily insert into the motor shaft 1 by using the push rod 3 to unlock the locking mechanism 7 or by its own oblique force to retract the locking mechanism 5; during disassembly, simply press the button to retract the locking mechanism 5 and remove the impeller 2.

[0054] In this embodiment, the two sides of the push rod 3 are planes 31 (e.g., Figure 4 The spring and locking element 7 respectively contact the elastic element 4, the locking element 5, and the unlocking element 7. This facilitates the pressing operation of the spring and the locking element. A spring mounting groove 14 is provided on the inner wall of the slot 11 for installing the spring, which facilitates pushing the spring and compressing the spring under force.

[0055] Second Embodiment

[0056] Several slots are spaced circumferentially along the motor shaft, allowing for the arrangement of multiple push rods and clamps as needed, improving the stability and reliability of the connection. This accommodates impellers of different sizes and types, further enhancing the adaptability and versatility of the structure.

[0057] The entire connection structure is compactly designed, utilizing the internal space of the motor shaft to house the push rod and spring without adding any external dimensions. This design not only saves space but also improves the overall integration of the equipment, making it suitable for various compact blower applications.

[0058] To ensure dynamic balance, push rods and clamps can be arranged in all four directions around the motor shaft. The matching slots, through the engagement of the clamps with the impeller slots, reduce the relative movement between the impeller and the motor shaft, thus lowering wear caused by vibration and impact. This design not only improves the blower's operating efficiency but also significantly extends the equipment's service life and reduces its total lifespan cost.

[0059] The specific installation procedure is as follows: Installation process: Insert the impeller into the motor shaft from top to bottom. Through the unlocking mechanism or the pushing action of the impeller, the retaining clip retracts until the impeller's slot aligns with the retaining clip. The elastic element then pushes the retaining clip into the slot, completing the installation. Disassembly process: Apply external force to the unlocking mechanism, driving the push rod to compress the elastic element, causing the retaining clip to retract, releasing the engagement, and allowing the impeller to be removed.

[0060] The above description is only a preferred embodiment of the present utility model, but the design concept of the present utility model is not limited thereto. Any non-substantial modifications made to the present utility model by those skilled in the art within the scope of the technology disclosed in the present utility model using this concept shall be deemed as an infringement of the protection scope of the present utility model.

Claims

1. A connection structure capable of preventing relative rotation of a blower impeller, characterized by: Including impeller and motor shaft installed in cooperation with each other; The one end of the motor shaft for installing the impeller is provided with a slot hole, and the slot hole is arranged in the axial direction; The slot hole is provided with a push rod, an elastic element and a clamping element, and the elastic element and the clamping element are arranged on the two sides of the push rod in opposition; The side wall of the motor shaft is provided with a first through hole in the radial direction, the first through hole is communicated with the slot hole, the clamping element is movably arranged in the first through hole, and one end of the clamping element is connected with the push rod; One end of the elastic element abuts against the inner wall of the slot hole, and the other end abuts against the push rod; The push rod and the elastic element are movable in the radial direction in the slot hole; In the initial state, the elastic element pushes the push rod, the push rod pushes the clamping element to move in the radial direction, and the other end of the clamping element extends out of the first through hole and partially protrudes from the motor shaft; When installing, the impeller is inserted into the motor shaft in the axial direction, the impeller pushes the clamping element, the clamping element is retracted into the first through hole, and the push rod compresses the elastic element in the radial direction to provide space for the retraction of the clamping element; The mounting hole of the impeller is provided with a clamping groove; When the impeller is inserted into the clamping groove opposite to the clamping element, the push rod pushes out the clamping element under the action of the elastic element, and the clamping element is clamped with the clamping groove.

2. The connecting structure capable of preventing the relative rotation of the impeller of the blower according to claim 1, characterized in that: The part of the clamping element protruding from the motor shaft is provided with a guide slope, and the guide slope cooperates with the mounting hole to guide the retraction of the clamping element.

3. The connecting structure capable of preventing the relative rotation of the impeller of the blower according to claim 2, characterized in that: The connection mode of the clamping element and the push rod is screw connection.

4. The connecting structure capable of preventing the relative rotation of the impeller of the blower according to claim 1, characterized in that: The push rod is connected with an unlocking element, and the unlocking element is arranged on the same side of the clamping element. External force acts on the unlocking element to drive the push rod to compress the elastic element and retract the clamping element into the first through hole, thereby releasing the clamping of the clamping element and the clamping groove.

5. The connecting structure capable of preventing the relative rotation of the impeller of the blower according to claim 4, characterized in that: The elastic element includes a plurality of springs, at least one spring is arranged corresponding to the position of the clamping element, and at least two springs are arranged corresponding to the position of the unlocking element. The number of springs corresponding to the position of the unlocking element is greater than the number of springs corresponding to the position of the clamping element.

6. The connecting structure capable of preventing the relative rotation of the impeller of the blower according to claim 5, characterized in that: The unlocking element includes a plurality of pins, and one spring is arranged corresponding to the position of one pin; The side wall of the motor shaft is provided with a plurality of second through holes in the radial direction, and the second through holes are arranged above the first through hole in the axial direction; One pin corresponds to one second through hole, and the pin is connected with the push rod by penetrating through the second through hole; The connection mode of the pin and the push rod is screw connection.

7. The connecting structure capable of preventing the relative rotation of the impeller of the blower according to claim 6, characterized in that: The unlocking element further includes a cover plate for connecting a plurality of pins; The cover plate covers the end of the pin, and the cover plate is exposed outside the motor shaft to accept external pressing force.

8. The connecting structure capable of preventing the relative rotation of the impeller of the blower according to claim 1, characterized in that: The impeller and the motor shaft are transitionally matched; The impeller is inserted on the motor shaft, the lower end of the impeller cooperates with the convex surface of the motor shaft, and the upper end of the impeller is locked with a nut, and the nut is threadedly connected with the motor shaft.

9. The connecting structure capable of preventing the relative rotation of the impeller of the blower according to claim 4, characterized in that: The two side surfaces of the push rod are flat surfaces, which respectively contact the elastic element, the clamping element and the unlocking element.

10. The connecting structure capable of preventing the relative rotation of the impeller of the blower according to claim 1, characterized in that: A plurality of slot holes are distributed on the motor shaft in the circumferential direction.

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