Anti-loose threaded impeller structure and water pump

Abstract

The utility model belongs to impeller technical field, especially point to a kind of threaded impeller structure and water pump of anti-loosening, including rotating shaft, impeller and screw, rotating shaft is equipped with assembly hole, assembly hole includes threaded hole one, round hole and threaded hole two, the end of impeller is equipped with connecting sleeve, connecting sleeve includes threaded sleeve and cylindrical sleeve, opening slot is set on cylindrical sleeve lateral wall, the stem of screw is sequentially threaded through impeller, connecting sleeve and threaded hole two and is screwed, stem includes optical axis section and screw thread section, the diameter of optical axis section is less than the inside diameter of cylindrical sleeve, and optical axis section outer periphery is equipped with annular boss, the maximum outside diameter of annular boss is greater than the inside diameter of cylindrical sleeve, when annular boss is located in cylindrical sleeve and outwardly props cylindrical sleeve, when opening slot becomes larger, cylindrical sleeve is tightly fitted with round hole;When annular boss leaves cylindrical sleeve, when opening slot restores, gap is left between cylindrical sleeve and round hole. The utility model can effectively prevent impeller from separating from rotating shaft failure, to guarantee the reliability of water pump use.

Description

Technical Field

[0001] This utility model belongs to the field of impeller technology, specifically referring to a threaded impeller structure and water pump that prevents loosening. Background Technology

[0002] Chinese utility model patent (publication number CN203257730U, application date 2013.04.25, publication date 2013.10.30) discloses a centrifugal pump with a self-locking mechanism for the impeller, including a motor, a connecting cover, a pump body, an impeller, a mechanical seal, and a pump shaft (i.e., a rotating shaft). The motor is bolted to the connecting cover, the pump shaft is connected to the motor, and the connecting cover is connected to the pump body. The impeller is sleeved on the pump shaft through an inner hole. The self-locking mechanism for the impeller includes a smooth surface and a threaded surface on the inner hole of the impeller, with the threaded surface located below the smooth surface. The threaded surface engages with the external thread on the pump shaft. An anti-loosening device is also provided on the pump shaft near the impeller inlet end to prevent the impeller from loosening. The anti-loosening device includes a sealing gasket and an anti-loosening screw, which are sequentially sleeved on the pump shaft at the impeller inlet end.

[0003] The shortcomings of the centrifugal pumps mentioned above are as follows: When the pump is running, the shaft provides a force in one direction to drive the impeller to rotate. The impeller rotates and does work on the liquid, while the liquid exerts a force in the opposite direction on the impeller. When the impeller stops, the water flows back and exerts a force in the opposite direction on the impeller, causing the impeller to rotate in reverse. Alternatively, when the impeller starts, it rotates in reverse, and the shaft provides a force in the opposite direction. Therefore, during use, the impeller will be subjected to forces in both directions and will also exhibit both forward and reverse rotation states. This can lead to the loosening of the anti-loosening screws and the impeller thread surface, causing the impeller to fall off the shaft and fail, thus affecting the use of the pump. Utility Model Content

[0004] The purpose of this invention is to provide a threaded impeller structure and water pump that prevents loosening, which can effectively prevent the impeller from detaching from the shaft and failing, thereby ensuring the reliability of the water pump.

[0005] This utility model is implemented as follows: One objective of this utility model is to provide an anti-loosening threaded impeller structure, comprising a shaft, an impeller, and a screw. The shaft has an assembly hole, which includes a threaded hole one, a circular hole, and a threaded hole two, coaxially arranged from the outside to the inside. The minor diameter of the threaded hole one is larger than the diameter of the circular hole, and the diameter of the circular hole is larger than the major diameter of the threaded hole two. The impeller end near the shaft has a connecting sleeve. The connecting sleeve includes a threaded sleeve and a cylindrical sleeve located on the side of the threaded sleeve away from the impeller. The threaded sleeve is screwed into the threaded hole one. The cylindrical sleeve is disposed within the circular hole, and the outer diameter of the cylindrical sleeve is smaller than the diameter of the circular hole. An opening groove is provided on the side wall, with the opening facing away from the impeller. The shank of the screw passes through the impeller, the connecting sleeve, and is screwed into the threaded hole. The shank includes a smooth shaft section and a threaded section. The threaded section is located on the side of the smooth shaft section away from the screw head and is screwed into the threaded hole. The diameter of the smooth shaft section is smaller than the inner diameter of the cylindrical sleeve, and an annular boss is provided on the outer circumference of the smooth shaft section. The maximum outer diameter of the annular boss is larger than the inner diameter of the cylindrical sleeve. When the annular boss is located inside the cylindrical sleeve and pushes the cylindrical sleeve outward, the opening groove becomes larger, and the cylindrical sleeve and the round hole are tightly fitted. When the annular boss leaves the cylindrical sleeve and the opening groove returns to its original position, a gap remains between the cylindrical sleeve and the round hole.

[0006] In the aforementioned anti-loosening threaded impeller structure, the inner hole of the connecting sleeve includes a large hole and a small hole arranged coaxially. The large hole is located inside the threaded sleeve, the depth of the small hole is greater than the height of the cylindrical sleeve, the small hole portion is located inside the threaded sleeve, the diameter of the optical axis section is smaller than the diameter of the small hole, the maximum outer diameter of the annular boss is greater than the diameter of the small hole, and the maximum outer diameter of the annular boss is smaller than the diameter of the large hole.

[0007] In the aforementioned anti-loosening threaded impeller structure, the inner hole of the impeller is a countersunk hole coaxially arranged with the inner hole of the connecting sleeve. The countersunk hole includes a countersunk hole and a through hole. The head is set in the countersunk hole, and the diameter of the through hole is equal to the diameter of the large hole.

[0008] In the aforementioned anti-loosening threaded impeller structure, the difference between the maximum outer diameter of the annular boss and the diameter of the small hole is greater than the difference between the diameter of the round hole and the outer diameter of the cylindrical sleeve.

[0009] In the aforementioned anti-loosening threaded impeller structure, the difference between the diameter of the circular hole and the outer diameter of the cylindrical sleeve is 0.2mm-0.4mm, and the difference between the maximum outer diameter of the annular boss and the diameter of the small hole is 0.2mm larger than the difference between the diameter of the circular hole and the outer diameter of the cylindrical sleeve.

[0010] In the aforementioned anti-loosening threaded impeller structure, the outer wall of the annular boss is arc-shaped, and the threaded hole and the round hole are connected by an arc transition.

[0011] In the aforementioned anti-loosening threaded impeller structure, there are two or more opening slots evenly distributed around the circumference, and the depth of the opening slots is less than the height of the cylindrical sleeve.

[0012] In the aforementioned anti-loosening threaded impeller structure, the end face of the impeller near the connecting sleeve abuts against the end face of the rotating shaft near the impeller, and an O-ring is provided between the two end faces; an O-ring is provided between the end face of the head near the rod and the impeller.

[0013] In the aforementioned anti-loosening threaded impeller structure, the end face of the impeller near the connecting sleeve is recessed to form an annular mounting groove one, and the O-ring one is disposed in the annular mounting groove one; the inner end face of the countersunk hole is recessed to form an annular mounting groove two, and the O-ring two is disposed in the annular mounting groove two.

[0014] In the aforementioned anti-loosening threaded impeller structure, the rotation direction of the thread in threaded hole one is consistent with the rotation direction of the impeller when it rotates forward, and the rotation direction of the thread in threaded hole two is opposite to the rotation direction of the thread in threaded hole one.

[0015] Another objective of this invention is to provide a water pump comprising any of the aforementioned anti-loosening threaded impeller structures.

[0016] The outstanding advantages of this utility model compared to the prior art are: This invention features a connecting sleeve at the end of the impeller near the shaft. An opening groove is formed on the cylindrical sleeve sidewall of the connecting sleeve, facing away from the impeller. The shank of a screw passes through the impeller, the connecting sleeve, and is screwed into the second threaded hole. An annular boss is provided on the outer circumference of the shank's smooth shaft section. After the screw is installed, the annular boss inside the cylindrical sleeve pushes the sleeve outwards. When the opening groove enlarges, the cylindrical sleeve and the circular hole fit tightly together, thus ensuring a tight fit between the annular boss and the connecting sleeve, and between the connecting sleeve and the shaft. This effectively prevents the screw from rotating relative to the connecting sleeve and the connecting sleeve from rotating relative to the shaft. This ensures the threaded section of the screw is locked to the threaded hole, and the threaded sleeve of the connecting sleeve is locked to the threaded hole, effectively preventing the impeller from detaching from the shaft and failing, thus guaranteeing the reliability of the water pump. Attached Figure Description

[0017] Figure 1 This is a partial sectional view of the water pump of this utility model.

[0018] Figure 2 yes Figure 1 Enlarged view of point A.

[0019] Figure 3 This is a partial sectional view of the rotating shaft of this utility model.

[0020] Figure 4This is a cross-sectional view of the impeller of this utility model.

[0021] Figure 5 This is a perspective view of the impeller of this utility model.

[0022] Figure 6 This is a front view of the screw of this utility model.

[0023] Reference numerals: 1. Shaft; 2. Impeller; 3. Screw; 3a. Rod; 3a1. Smooth shaft section; 3a2. Threaded section; 3b. Head; 3c. Annular boss; 4. Assembly hole; 4a. Threaded hole one; 4b. Round hole; 4c. Threaded hole two; 5. Connecting sleeve; 5a. Threaded sleeve; 5b. Cylindrical sleeve; 6. Opening groove; 7. Large hole; 8. Small hole; 9. Countersunk hole; 9a. Countersunk hole; 9b. Through hole; 10. Arc; 11. O-ring one; 12. O-ring two; 13. Annular mounting groove one; 14. Annular mounting groove two. Detailed Implementation

[0024] The present invention will be further described below with reference to specific embodiments. See also: Figure 1 —6: One objective of this utility model is to provide a threaded impeller structure for preventing loosening, comprising a shaft 1, an impeller 2, and a screw 3. The shaft 1 has an assembly hole 4, which includes a threaded hole 4a, a circular hole 4b, and a threaded hole 4c arranged coaxially from the outside to the inside. The minor diameter of the threaded hole 4a is larger than the diameter of the circular hole 4b, and the diameter of the circular hole 4b is larger than the major diameter of the threaded hole 4c. The impeller 2 has a connecting sleeve 5 near the end of the shaft 1. The connecting sleeve 5 includes a threaded sleeve 5a and a cylindrical sleeve 5b located on the side of the threaded sleeve 5a away from the impeller 2. The threaded sleeve 5a is screwed into the threaded hole 4a. The cylindrical sleeve 5b is disposed within the circular hole 4b, and the outer diameter of the cylindrical sleeve 5b is smaller than the diameter of the circular hole 4b. An opening is formed on the side wall of the cylindrical sleeve 5b facing... The screw 3's shank 3a passes through the impeller 2, the connecting sleeve 5, and the threaded hole 4c in sequence through the opening slot 6 on the side away from the impeller 2. The shank 3a includes a smooth shaft section 3a1 and a threaded section 3a2. The threaded section 3a2 is located on the side of the smooth shaft section 3a1 away from the screw 3 head 3b. The threaded section 3a2 is threaded into the threaded hole 4c. The diameter of the smooth shaft section 3a1 is smaller than the inner diameter of the cylindrical sleeve 5b, and the smooth shaft section 3a1 has an annular boss 3c on its outer circumference. The maximum outer diameter of the annular boss 3c is larger than the inner diameter of the cylindrical sleeve 5b. When the annular boss 3c is located inside the cylindrical sleeve 5b and pushes the cylindrical sleeve 5b outward, the opening slot 6 becomes larger, and the cylindrical sleeve 5b and the circular hole 4b are tightly fitted. When the annular boss 3c leaves the cylindrical sleeve 5b and the opening slot 6 returns to its original position, a gap remains between the cylindrical sleeve 5b and the circular hole 4b.

[0025] The assembly process of this utility model is as follows: Figure 1-6 As shown, firstly, the connecting sleeve 5, located at the end of the impeller 2 near the shaft 1, is inserted into the mounting hole 4 of the shaft 1, such that the threaded sleeve 5a of the connecting sleeve 5 is screwed into the threaded hole 4a of the mounting hole 4, and the cylindrical sleeve 5b is placed in the circular hole 4b. At this time, there is a gap between the cylindrical sleeve 5b and the circular hole 4b, which facilitates the screwing of the threaded sleeve 5a into the threaded hole 4a. Next, the shank 3a of the screw 3 passes through the impeller 2 and the connecting sleeve 5 in sequence and is inserted into the mounting hole 4, such that the threaded section 3a2 of the shank 3a is screwed into the threaded hole 4c of the mounting hole 4. At this time, the annular boss 3c is located inside the cylindrical sleeve 5b and pushes the cylindrical sleeve 5b outward, the opening groove 6 becomes larger, and the cylindrical sleeve 5b is tightly fitted with the circular hole 4b.

[0026] The disassembly process of this utility model: as follows Figure 1-6 As shown, rotate screw 3 to remove screw 3, the annular boss 3c leaves the cylindrical sleeve 5b, and when the opening groove 6 is restored, there is a gap between the cylindrical sleeve 5b and the round hole 4b. Rotate impeller 2 to remove connecting sleeve 5.

[0027] This invention features a connecting sleeve 5 at the end of the impeller 2 near the shaft 1. An opening groove 6, facing away from the impeller 2, is formed on the side wall of the cylindrical sleeve 5b of the connecting sleeve 5. The shank 3a of the screw 3 passes through the impeller 2, the connecting sleeve 5, and is screwed into the threaded hole 4c. An annular boss 3c is provided on the outer circumference of the smooth shaft section 3a1 of the shank 3a. After the screw 3 is installed, the annular boss 3c, located inside the cylindrical sleeve 5b, pushes the cylindrical sleeve 5b outwards, increasing the size of the opening groove 6. The cylindrical sleeve 5b is tightly fitted with the circular hole 4b, thereby ensuring that the annular boss 3c is tightly fitted with the connecting sleeve 5 and the connecting sleeve 5 is tightly fitted with the rotating shaft 1. This effectively prevents the screw 3 from rotating relative to the connecting sleeve 5 and the connecting sleeve 5 from rotating relative to the rotating shaft 1. This ensures that the threaded section 3a2 of the screw 3 is threadedly locked with the threaded hole 4c and the threaded sleeve 5a of the connecting sleeve 5 is threadedly locked with the threaded hole 4a. This effectively prevents the impeller 2 from disengaging from the rotating shaft 1 and failing, thus ensuring the reliability of the water pump.

[0028] At the same time, this utility model has a simple structure and is easy to install.

[0029] The inner hole structure of the connecting sleeve 5 and the mounting structure of the shank 3a of the screw 3: such as Figure 1 , 2 As shown in Figures 4-6, the inner hole of the connecting sleeve 5 includes a large hole 7 and a small hole 8 coaxially arranged. The large hole 7 is located inside the threaded sleeve 5a, and the depth of the small hole 8 is greater than the height of the cylindrical sleeve 5b. The small hole 8 is partially located inside the threaded sleeve 5a. The diameter of the optical axis section 3a1 is smaller than the diameter of the small hole 8, and the maximum outer diameter of the annular boss 3c is greater than the diameter of the small hole 8. The maximum outer diameter of the annular boss 3c is smaller than the diameter of the large hole 7, which facilitates the insertion of the rod part 3a and makes the connecting sleeve 5 strong.

[0030] The internal structure of impeller 2: as follows Figure 1 , 2 As shown in Figure 4, the inner hole of the impeller 2 is a countersunk hole 9 coaxially arranged with the inner hole of the connecting sleeve 5. The countersunk hole 9 includes a countersunk hole 9a and a through hole 9b. The head 3b is disposed in the countersunk hole 9a, and the diameter of the through hole 9b is equal to the diameter of the large hole 7. The head 3b of the screw 3 is recessed into the impeller 2, reducing the impact on the water flow and making the performance more stable.

[0031] Furthermore, the difference between the maximum outer diameter of the annular boss 3c and the diameter of the small hole 8 is greater than the difference between the diameter of the round hole 4b and the outer diameter of the cylindrical sleeve 5b, so that the annular boss 3c and the small hole 8 are tightly fitted, and the cylindrical sleeve 5b and the round hole 4b are tightly fitted.

[0032] Preferably, the difference between the diameter of the circular hole 4b and the outer diameter of the cylindrical sleeve 5b is 0.2mm-0.4mm, and the difference between the maximum outer diameter of the annular boss 3c and the diameter of the small hole 8 is 0.2mm larger than the difference between the diameter of the circular hole 4b and the outer diameter of the cylindrical sleeve 5b.

[0033] To facilitate the installation of screw 3 and connecting sleeve 5, the outer wall of the annular boss 3c is arc-shaped, and the threaded hole 4a and the round hole 4b are connected by an arc 10.

[0034] To achieve a better fit, there are two or more opening slots 6 evenly distributed around the circumference, and the depth of the opening slots 6 is less than the height of the cylindrical sleeve 5b, so that the cylindrical sleeve 5b can be pushed outward.

[0035] To seal the gap between impeller 2 and shaft 1, such as Figure 1 , 2 As shown, the end face of the impeller 2 near the connecting sleeve 5 abuts against the end face of the rotating shaft 1 near the impeller 2, and an O-ring 11 is provided between the two end faces.

[0036] To seal the gap between screw 3 and impeller 2, such as Figure 1 , 2 As shown in Figure 4, an O-ring 12 is provided between the end face of the head 3b near the rod 3a and the impeller 2.

[0037] The installation structure of O-ring 11: as follows Figure 1 , 2 As shown in Figures 4 and 5, the end face of the impeller 2 near the connecting sleeve 5 is recessed to form an annular mounting groove 13, and the O-ring 11 is disposed in the annular mounting groove 13.

[0038] The installation structure of O-ring 212: as follows Figure 1 , 2As shown in Figure 4, the inner end face of the countersunk hole 9a is recessed to form an annular mounting groove 14, and the O-ring 12 is disposed in the annular mounting groove 14.

[0039] Furthermore, the rotation direction of the thread in threaded hole 4a is the same as the rotation direction of the impeller 2 when it rotates clockwise, while the rotation direction of the thread in threaded hole 4c is opposite to that of threaded hole 4a, and they exert forces on each other. If screw 3 is loose, because the annular boss 3c is tightly fitted with the cylindrical sleeve 5b, screw 3 will drive the connecting sleeve 5 to rotate in the tightening direction, and the connecting sleeve 5 and the rotating shaft 1 will be tightened more tightly; if impeller 2 is loose, because the annular boss 3c is tightly fitted with the cylindrical sleeve 5b, the connecting sleeve 5 will drive screw 3 to rotate in the tightening direction, and the screw 3 and the rotating shaft 1 will be tightened more tightly.

[0040] Another objective of this invention is to provide a water pump comprising any of the aforementioned anti-loosening threaded impeller structures.

[0041] The above embodiments are only one of the preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes made in accordance with the shape, structure and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. A threaded impeller structure for preventing loosening, comprising a shaft (1), an impeller (2), and a screw (3), characterized in that: The rotating shaft (1) is provided with an assembly hole (4), which includes a threaded hole one (4a), a round hole (4b), and a threaded hole two (4c) arranged coaxially from the outside to the inside. The minor diameter of the threaded hole one (4a) is larger than the diameter of the round hole (4b), and the diameter of the round hole (4b) is larger than the major diameter of the threaded hole two (4c). The impeller (2) is provided with a connecting sleeve (5) at the end near the rotating shaft (1). The connecting sleeve (5) includes a threaded sleeve. The sleeve (5a) and the cylindrical sleeve (5b) located on the side of the threaded sleeve (5a) away from the impeller (2) are provided. The threaded sleeve (5a) is screwed into the threaded hole (4a). The cylindrical sleeve (5b) is disposed in the circular hole (4b) and the outer diameter of the cylindrical sleeve (5b) is smaller than the diameter of the circular hole (4b). The side wall of the cylindrical sleeve (5b) is provided with an opening groove (6) facing the side away from the impeller (2). The shank (3a) of the screw (3) is also provided. The rod (3a) passes through the impeller (2), the connecting sleeve (5), and is screwed into the threaded hole (4c) in sequence. The rod (3a) includes a smooth shaft section (3a1) and a threaded section (3a2). The threaded section (3a2) is located on the side of the smooth shaft section (3a1) away from the head (3b) of the screw (3). The threaded section (3a2) is screwed into the threaded hole (4c). The diameter of the smooth shaft section (3a1) is smaller than the inner diameter of the cylindrical sleeve (5b), and the outer diameter of the smooth shaft section (3a1) is smaller than the inner diameter of the cylindrical sleeve (5b). The annular boss (3c) is provided around the cylindrical sleeve (5b). The maximum outer diameter of the annular boss (3c) is greater than the inner diameter of the cylindrical sleeve (5b). When the annular boss (3c) is located inside the cylindrical sleeve (5b) and pushes the cylindrical sleeve (5b) outward, the opening groove (6) becomes larger, and the cylindrical sleeve (5b) is tightly fitted with the round hole (4b). When the annular boss (3c) leaves the cylindrical sleeve (5b) and the opening groove (6) returns to its original state, a gap is left between the cylindrical sleeve (5b) and the round hole (4b).

2. The anti-loosening threaded impeller structure according to claim 1, characterized in that: The inner hole of the connecting sleeve (5) includes a large hole (7) and a small hole (8) arranged coaxially. The large hole (7) is located inside the threaded sleeve (5a). The depth of the small hole (8) is greater than the height of the cylindrical sleeve (5b). The small hole (8) is partially located inside the threaded sleeve (5a). The diameter of the optical axis section (3a1) is smaller than the diameter of the small hole (8). The maximum outer diameter of the annular boss (3c) is greater than the diameter of the small hole (8), and the maximum outer diameter of the annular boss (3c) is smaller than the diameter of the large hole (7).

3. The anti-loosening threaded impeller structure according to claim 2, characterized in that: The inner hole of the impeller (2) is a countersunk hole (9) coaxially arranged with the inner hole of the connecting sleeve (5). The countersunk hole (9) includes a countersunk hole (9a) and a through hole (9b). The head (3b) is arranged in the countersunk hole (9a). The diameter of the through hole (9b) is equal to the diameter of the large hole (7).

4. The anti-loosening threaded impeller structure according to claim 2, characterized in that: The difference between the maximum outer diameter of the annular boss (3c) and the diameter of the small hole (8) is greater than the difference between the diameter of the round hole (4b) and the outer diameter of the cylindrical sleeve (5b).

5. The anti-loosening threaded impeller structure according to claim 4, characterized in that: The difference between the diameter of the circular hole (4b) and the outer diameter of the cylindrical sleeve (5b) is 0.2mm-0.4mm. The difference between the maximum outer diameter of the annular boss (3c) and the diameter of the small hole (8) is 0.2mm larger than the difference between the diameter of the circular hole (4b) and the outer diameter of the cylindrical sleeve (5b).

6. The anti-loosening threaded impeller structure according to claim 1, characterized in that: The outer wall of the annular boss (3c) is arc-shaped, and the threaded hole (4a) and the round hole (4b) are connected by an arc (10).

7. The anti-loosening threaded impeller structure according to claim 1, characterized in that: There are two or more opening slots (6) evenly distributed around the circumference, and the depth of the opening slots (6) is less than the height of the cylindrical sleeve (5b).

8. The anti-loosening threaded impeller structure according to claim 1, characterized in that: The end face of the impeller (2) near the connecting sleeve (5) abuts against the end face of the rotating shaft (1) near the impeller (2), and an O-ring (11) is provided between the two end faces; an O-ring (12) is provided between the end face of the head (3b) near the rod (3a) and the impeller (2).

9. The anti-loosening threaded impeller structure according to claim 1, characterized in that: The rotation direction of the thread in the first threaded hole (4a) is the same as the rotation direction of the impeller (2) when it rotates forward, and the rotation direction of the thread in the second threaded hole (4c) is opposite to the rotation direction of the thread in the first threaded hole (4a).

10. A water pump, characterized in that: The water pump includes the anti-loosening threaded impeller structure as described in any one of claims 1-9.

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