A non-clogging structure for the impeller inlet of a pipeline pump

Abstract

This utility model discloses a non-clogging structure for the impeller inlet of a pipeline pump, including a motor, a pump cover, and a pump body. The motor is located directly above the pump body, and the pump cover is fixed between the motor and the pump body. The output end of the motor has an extension shaft that passes through the pump cover vertically. An impeller is located inside the pump body and is fitted onto the lower end of the extension shaft. A mechanical seal is provided between the pump cover and the impeller hub, and the extension shaft passes through the mechanical seal vertically. The center of the hub has an internal threaded hole, and the lower end of the extension shaft has an external thread. The lower end of the extension shaft and the center of the hub are connected by the internal and external threads. This utility model has two designs: one where the extension shaft of the motor has an external threaded shaft extension end that connects to the internal thread of the impeller hub; and another where the extension shaft of the motor is connected to the impeller through an impeller retainer. In both cases, the extension shaft of the motor does not pass through the impeller, and the impeller can fully meet the hydraulic design requirements, reducing inlet discharge and improving performance parameters, especially showing good effects in increasing flow rate and improving cavitation.

Description

Technical Field

[0001] This utility model relates to the field of pipeline pump impeller technology, and in particular to a non-clogging structure for the inlet of a pipeline pump impeller. Background Technology

[0002] There are two structures for the impeller inlet design of conventional pipeline pumps. One approach is to simplify the process by not considering the impeller hub front end without a shaft. However, in practical applications, in order to fix the impeller on the extended shaft of the motor, it can only be fixed with an impeller nut to transmit tension. Torque is achieved through a key. However, the shape of the impeller nut does not completely match the hydraulic shape of the impeller inlet. It is generally larger than the design size of the impeller inlet, which affects the pump performance. Another approach involves designing the impeller inlet to account for inlet blockage and providing a margin for such blockage. However, in actual applications, the impeller nut may be too large or too small, failing to meet the designed blockage margin, and its shape may not meet the hydraulic design requirements of the impeller inlet. Summary of the Invention

[0003] To address the problems existing in the prior art, this utility model provides a non-clogging structure for the impeller inlet of a pipeline pump, where the extended motor shaft does not pass through the impeller, reducing impeller inlet discharge and improving impeller performance parameters. To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A non-clogging structure for the impeller inlet of a pipeline pump includes a motor, a pump cover, and a pump body. The motor is located directly above the pump body, and the pump cover is fixed between the motor and the pump body. The output end of the motor is provided with an extension shaft that penetrates the pump cover vertically. An impeller is provided inside the pump body and is sleeved on the lower end of the extension shaft. A mechanical seal is provided between the pump cover and the impeller hub, and the extension shaft penetrates the mechanical seal vertically. The center of the hub is provided with an internal threaded hole, and the lower end of the extension shaft is provided with an external thread. The lower end of the extension shaft and the center of the hub are connected by the internal and external threads.

[0004] A non-clogging structure for the impeller inlet of a pipeline pump includes a motor, a pump cover, and a pump body. The motor is located directly above the pump body, and the pump cover is fixed between the motor and the pump body. The output end of the motor is provided with an extension shaft that passes through the pump cover in a vertical direction. An impeller is provided inside the pump body and is sleeved on the lower end of the extension shaft. An impeller retaining ring is provided at the shoulder of the lower part of the extension shaft. The impeller retaining ring has a split structure and is fixed to the upper end of the impeller hub by an internal hex bolt. A mechanical seal is provided between the pump cover and the impeller retaining ring, and the extension shaft passes through the mechanical seal in a vertical direction.

[0005] Furthermore, a keyway is provided at the lower end of the center of the hub, and a key is provided at the lower end of the extended shaft. The key and the keyway are positioned in conjunction.

[0006] Compared with the prior art, the present invention has the following technical effects: This utility model has two designs: one is that the extended shaft of the motor has an external threaded shaft extension end that is connected to the internal thread of the impeller hub; the other is that the extended shaft of the motor is connected to the impeller through an impeller retainer. With the above two designs, the extended shaft of the motor will not pass through the impeller, the impeller can fully meet the hydraulic design requirements, reduce inlet discharge, and improve performance parameters, especially with good effects on increasing flow rate and improving cavitation. Attached Figure Description

[0007] Figure 1 This is an overall structural diagram of Embodiment 1 of this application; Figure 2 yes Figure 1 A magnified view of a portion of region A in the middle; Figure 3 This is an overall structural diagram of Embodiment 2 of this application; Figure 4 yes Figure 3 A magnified view of a portion of the impeller retaining ring.

[0008] The parts in the attached diagram are labeled as follows: 1. Motor, 2. Extended shaft, 3. Pump cover, 4. Pump body, 5. Impeller 6. Mechanical seal, 7. Socket head bolt, 8. Impeller retaining ring, 9. Key, 10. Hub 11 Internal threaded hole, 12 External thread, 13 Shaft extension end. Detailed Implementation

[0009] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0010] Example 1 This embodiment discloses a non-clogging structure for the impeller inlet of a pipeline pump, such as... Figure 1 As shown, the pump includes a motor 1, a pump cover 3, and a pump body 4. The motor 1 is located directly above the pump body 4. The pump cover 3 is fixed between the motor 1 and the pump body 4. The output end of the motor 1 is provided with an extension shaft 2, which passes through the pump cover 3 in the vertical direction. An impeller 5 is provided inside the pump body 4. The impeller 5 is sleeved on the lower end of the extension shaft 2. A mechanical seal 6 is provided between the pump cover 3 and the hub 10 of the impeller 5.

[0011] like Figure 2As shown, the extended shaft 2 passes through the mechanical seal 6 in the vertical direction, the center of the hub 10 is provided with an internal thread hole 11, the lower end of the extended shaft 2 is provided with an external thread 12, and the lower end of the extended shaft 2 and the center of the hub 10 are connected by the internal and external threads.

[0012] Preferably, the lower end of the extended shaft 2 is provided with a shaft extension end 13, the outer diameter of the shaft extension end 13 is smaller than the outer diameter of the rest of the extended shaft 2, and an external thread 12 is provided only at the shaft extension end 13, so that the shaft extension end 13 is connected to the center of the hub 10 through the internal and external thread engagement.

[0013] In this embodiment, the extended shaft 2 does not pass through the lower end of the hub 10, thus not interfering with the hydraulic design of the impeller 5 inlet, achieving the goal of preventing blockage at the impeller 5 inlet.

[0014] The hub 10 and the extended shaft 2 are connected by a thread to transmit the torque and tension of the motor 1. The shaft diameter of the extended shaft 2 is within 20mm (including 20mm). The smaller shaft diameter means that the power of the motor 1 is smaller, and the transmitted torque and tension are also smaller. This ensures that the torque and tension of the motor 1 are transmitted well, while achieving the effect of no blockage at the inlet of the impeller 5.

[0015] Example 2 This embodiment discloses a non-clogging structure for the impeller inlet of a pipeline pump, such as... Figure 3 and Figure 4 As shown, the pump includes a motor 1, a pump cover 3, and a pump body 4. The motor 1 is located directly above the pump body 4. The pump cover 3 is fixed between the motor 1 and the pump body 4. The output end of the motor 1 is provided with an extension shaft 2, which passes through the pump cover 3 in the vertical direction. An impeller 5 is provided inside the pump body 4. The impeller 5 is sleeved on the lower end of the extension shaft 2. An impeller retaining ring 8 is provided at the shoulder of the lower part of the extension shaft 2. The impeller retaining ring 8 is fixed to the upper end of the hub 10 of the impeller 5 by an internal hex bolt 7. A mechanical seal 6 is provided between the pump cover 3 and the impeller retaining ring 8, and the extension shaft 2 passes through the mechanical seal 6 in the vertical direction.

[0016] The lower end of the center of the hub 10 is provided with a keyway, and the lower end of the extended shaft 2 is provided with a key 9. The key 9 and the keyway are positioned together.

[0017] To facilitate the mounting of the impeller retainer 8 onto the extended shaft 2 of the motor, the impeller retainer 8 is designed with a split structure. The hexagon socket bolt 7 is recessed into the bolt hole of the impeller retainer 8, without interfering with the assembly of the mechanical seal 6. A countersunk hole is provided at one end of the bolt hole of the impeller retainer 8, allowing the impeller retainer 8 to use a pump with a higher power. In this embodiment, the extended shaft 2 does not pass through the lower end of the hub 10, thus achieving the purpose of preventing blockage at the impeller 5 inlet.

[0018] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A non-clogging structure for the impeller inlet of a pipeline pump, comprising a motor (1), a pump cover (3), and a pump body (4), wherein the motor (1) is located directly above the pump body (4), the pump cover (3) is fixed between the motor (1) and the pump body (4), the output end of the motor (1) is provided with an extension shaft (2), the extension shaft (2) penetrates the pump cover (3) in a vertical direction, and an impeller (5) is provided inside the pump body (4), the impeller (5) being sleeved on the lower end of the extension shaft (2), characterized in that, A mechanical seal (6) is provided between the pump cover (3) and the impeller (5) hub (10). The extended shaft (2) passes through the mechanical seal (6) in the vertical direction. The center of the hub (10) is provided with an internal thread hole. The lower end of the extended shaft (2) is provided with an external thread. The lower end of the extended shaft (2) and the center of the hub (10) are connected by internal and external threads.

2. A non-clogging structure for the impeller inlet of a pipeline pump, comprising a motor (1), a pump cover (3), and a pump body (4), wherein the motor (1) is located directly above the pump body (4), the pump cover (3) is fixed between the motor (1) and the pump body (4), the output end of the motor (1) is provided with an extension shaft (2), the extension shaft (2) penetrates the pump cover (3) in the vertical direction, and an impeller (5) is provided inside the pump body (4), the impeller (5) being sleeved on the lower end of the extension shaft (2), characterized in that, An impeller retainer (8) is provided at the shoulder of the lower part of the extended shaft (2). The impeller retainer (8) is a split structure. The impeller retainer (8) is fixed to the upper end of the hub (10) of the impeller (5) by an internal hex bolt (7). A mechanical seal (6) is provided between the pump cover (3) and the impeller retainer (8). The extended shaft (2) passes through the mechanical seal (6) in the vertical direction.

3. The pipe pump impeller inlet non-clogging structure of claim 2, wherein, The lower end of the center of the hub (10) is provided with a keyway, and the lower end of the extended shaft (2) is provided with a key (9). The key (9) and the keyway are positioned in conjunction.

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