Chemical centrifugal pump with impeller nut locking structure
By designing the anti-loosening mechanism of the impeller nut and chuck in the centrifugal pump, the problem of the impeller nut loose in abnormal working conditions of the traditional centrifugal pump is solved, and normal operation and seal reliability are improved under reverse working conditions.
Patent Information
- Application Number
- CN202520132888.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-21
- Publication Date
- 2025-02-25
- Estimated Expiration
- 2035-01-21
AI Technical Summary
In abnormal operating conditions, the impeller nuts are prone to loosening, resulting in seal leakage and damage to the sealing surface, affecting its operational reliability.
An anti-loosening mechanism including an impeller nut and a chuck is designed. Through the cooperation of the cylindrical pin and the sealing gasket, the impeller nut does not loosen under the reversing working condition and prevents media leakage.
It effectively solves the problem of loosening impeller nuts under abnormal working conditions, ensures the normal operation of the centrifugal pump under reverse working conditions, and improves the reliability of sealing and leakage protection.
Smart Images
Figure CN222526513U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a centrifugal pump, in particular to a chemical centrifugal pump with an impeller nut anti-loosening structure. Background Art
[0002] Traditional single-stage horizontal centrifugal pumps are widely used in power plants, coal chemical industry, papermaking, food and other industries, and have a very reliable operating performance. Under normal operation, because the impeller nut has a small mass and small inertia force, the impeller nut is directly tightened to the end face of the impeller and will not loosen. However, some devices do not have a check valve and backflow causes reversal. Under such abnormal conditions, the impeller nut will loosen, causing the impeller to move axially, causing the seal to leak or even damage the sealing surface, thereby affecting its operating reliability. Therefore, a method or device that can solve the above problems is now needed. There are also previous anti-loosening methods, such as double nut structure and screw passing through the cap nut structure, but the structure and effect are not ideal. Utility Model Content
[0003] In view of the deficiencies in the prior art, the utility model proposes a chemical centrifugal pump with an impeller nut anti-loosening structure, comprising a pump body, an impeller and a pump cover, wherein the pump cover is connected to a bearing box, a pump shaft is rotatably supported in the bearing box by a deep groove ball bearing, the impeller is located in a pump cavity formed by the pump body and the pump cover, and a mechanical seal is also arranged on the pump shaft, an anti-loosening mechanism is arranged at one end of the pump shaft, and the other end of the pump shaft protrudes out of the bearing box.
[0004] As a further improvement of the utility model, the anti-loosening mechanism includes an impeller nut and a chuck, and the pump shaft is fixedly connected to the impeller through the impeller nut and the chuck, wherein the chuck is provided with a cylindrical pin, and the cylindrical pin is interference fit with the light hole on the impeller nut, and the protruding end of the cylindrical pin extends into the keyway of the impeller and the pump shaft, and a key is installed in the keyway, and the impeller and the pump shaft transmit torque through the key.
[0005] As a further improvement of the utility model, one end of the chuck is connected to the keyway hole of the impeller through a cylindrical pin, and the other end is connected to the impeller nut.
[0006] As a further improvement of the utility model, the thin-wall hole of the chuck is inserted into the outer circle of the impeller nut.
[0007] As a further improvement of the utility model, a second sealing gasket is arranged between the impeller nut and the chuck.
[0008] As a further improvement of the utility model, a first sealing gasket is arranged between the chuck and the impeller.
[0009] As a further improvement of the utility model, the mechanical seal is located at the connection between the pump cover and the bearing box.
[0010] Beneficial effects of the utility model:
[0011] 1. The structure is simple, the design is ingenious, and the layout is reasonable. It aims to solve the problem that the impeller nut of the traditional centrifugal pump is easy to loosen and cannot run stably, and improves the pump shaft and impeller nut of the centrifugal pump. Specifically, a chuck is added, and one end of the chuck (impeller end) is connected to the keyway hole of the impeller through a cylindrical pin, and the other end (threaded end of the shaft end) is screwed on the impeller nut.
[0012] 2. There are sealing gaskets between the impeller nut and the chuck and between the chuck and the impeller end face to prevent the medium from leaking onto the shaft, thereby protecting the shaft.
[0013] 3. The thin-walled hole of the chuck is inserted into the outer circle of the impeller nut. After the impeller nut is tightened, the outer circle of the thin-walled sleeve of the chuck is gently tapped with the copper rod of the assembly tool to make the thin-walled hole fit with the hexagonal part of the impeller nut. In this way, the impeller, chuck, impeller nut, cylindrical pin and sealing gasket form an integrated anti-loosening structure device.
[0014] 4. It can work normally under reverse working conditions, and the manufacturing process is simple and the manufacturing cost is low. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a structural schematic diagram of the utility model.
[0016] Figure 2 It is a cross-sectional view of the anti-loosening part of the utility model.
[0017] Figure 3 This is the impeller nut diagram.
[0018] Figure 4 It's a chuck diagram.
[0019] In the figure: 1, pump body, 2, impeller, 3, pump cover, 4, bearing box, 5, deep groove ball bearing, 6, pump shaft, 7, mechanical seal, 8, first sealing gasket, 9, second sealing gasket, 10, impeller nut, 11, key, 12, cylindrical pin, 13, chuck. DETAILED DESCRIPTION
[0020] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The embodiments described are given in the drawings. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly and comprehensively understood.
[0021] like Figure 1-Figure 4As shown, a chemical centrifugal pump with an impeller nut anti-loosening structure comprises a pump body 1, an impeller 2 and a pump cover 3, wherein the pump cover 3 is connected to a bearing box 4, wherein a pump shaft 6 is rotatably supported in the bearing box 4 by a deep groove ball bearing 5, wherein the impeller 2 is located in a pump cavity formed by the pump body 1 and the pump cover 3, and a mechanical seal 7 is also provided on the pump shaft 6, wherein the mechanical seal 7 is located at the connection between the pump cover 3 and the bearing box 4, and an anti-loosening mechanism is provided at one end of the pump shaft 6. The other end of the pump shaft 6 protrudes out of the bearing box 4. The anti-loosening mechanism comprises an impeller nut 10 and a chuck 13, wherein the pump shaft 6 is fixedly connected to the impeller through the impeller nut 10 and the chuck 13, wherein the chuck 13 has a cylindrical pin 12, wherein the cylindrical pin 12 is interference fit with the light hole on the impeller nut 10, wherein the protruding end of the cylindrical pin 12 extends into the keyway of the impeller 2 and the pump shaft 6, wherein a key 11 is provided in the keyway, and the impeller 2 and the pump shaft 6 transmit torque through the key 11. One end of the chuck 13 is connected to the keyway hole of the impeller 2 through a cylindrical pin 12, and the other end is connected to the impeller nut 10. The thin-walled hole of the chuck 13 is inserted into the outer circle of the impeller nut 10. A second sealing gasket 9 is arranged between the impeller nut 10 and the chuck 13 to prevent the medium from leaking onto the shaft, thereby protecting the shaft. A first sealing gasket 8 is arranged between the chuck 13 and the impeller 2.
[0022] The thin-walled hole of the chuck 13 is inserted into the outer circumference of the impeller nut 10. After the impeller nut 10 is tightened, the outer circumference of the thin-walled sleeve of the chuck 13 is gently tapped using an assembly tool, a copper rod, to ensure that the thin-walled hole fits tightly with the hexagonal part of the impeller nut 10. In this way, the impeller 2, the key 11, the chuck 13, the impeller nut 10, the cylindrical pin 12 and the sealing gasket are combined into an integral anti-loosening mechanism.
[0023] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.
Claims
1. A chemical centrifugal pump with an impeller nut anti-loosening structure, characterized in that: The pump comprises a pump body (1), an impeller (2) and a pump cover (3), wherein the pump cover (3) is connected to a bearing box (4), a pump shaft (6) is rotatably supported in the bearing box (4) via a deep groove ball bearing (5), the impeller (2) is located in a pump cavity formed by the pump body (1) and the pump cover (3), a mechanical seal (7) is further provided on the pump shaft (6), one end of the pump shaft (6) is provided with an anti-loosening mechanism, and the other end of the pump shaft (6) protrudes outside the bearing box (4); The anti-loosening mechanism comprises an impeller nut (10) and a chuck (13), and the pump shaft (6) is fixedly connected to the impeller through the impeller nut (10) and the chuck (13), wherein the chuck (13) is provided with a cylindrical pin (12), and the cylindrical pin (12) is interference-fitted with a light hole on the chuck (13), and the protruding end of the cylindrical pin (12) extends into a keyway of the impeller (2) and the pump shaft (6), and a key (11) is installed in the keyway, and the impeller (2) and the pump shaft (6) transmit torque through the key (11).
2. The chemical centrifugal pump with an impeller nut anti-loosening structure according to claim 1, characterized in that: One end of the chuck (13) is connected to the keyway hole of the impeller (2) via a cylindrical pin (12), and the other end is connected to the impeller nut (10).
3. The chemical centrifugal pump with an impeller nut anti-loosening structure according to claim 2, characterized in that: The thin-walled hole of the chuck (13) is inserted into the outer circle of the impeller nut (10).
4. The chemical centrifugal pump with an impeller nut anti-loosening structure according to claim 3, characterized in that: A second sealing gasket (9) is provided between the impeller nut (10) and the chuck (13).
5. The chemical centrifugal pump with an impeller nut anti-loosening structure according to claim 4, characterized in that: A first sealing gasket (8) is provided between the chuck (13) and the impeller (2).
6. The chemical centrifugal pump with an impeller nut anti-loosening structure according to claim 1, characterized in that: The mechanical seal (7) is located at the connection between the pump cover (3) and the bearing box (4).