A structure for preventing internal leakage of a horizontal single-stage centrifugal pump

Abstract

The utility model discloses a structure for preventing internal leakage of horizontal single-stage centrifugal pump, related to centrifugal pump field, including pump body, guide vane, impeller and motor, be equipped with water inlet and water outlet on the pump body, and motor is connected through motor shaft and drives impeller, and guide vane cover is established in the impeller outside and is close to the water outlet place, and the impeller mouth part is close to the water inlet place and installs the mouth ring, and the mouth ring is supported on the guide vane, and forms the primary seal between the pump body and the guide vane, installs the sealing washer at the pump body and the guide vane sealing surface outside side stop mouth step, and the sealing washer is extruded by the pump body and the guide vane, forms the axial contact surface and radial contact surface, and the axial contact surface forms the axial seal with the guide vane, and the radial contact surface forms the radial seal with the pump body. The utility model effectively solved the problem of the low efficiency caused by the internal leakage of the water pump due to the poor flatness of the pump body and the guide vane cooperation sealing surface, and under the condition of not destroying the hydraulic structure, increases secondary seal, reduces the volume loss, thereby improves the water pump efficiency.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal pumps, and specifically to a structure for preventing internal leakage in a horizontal single-stage centrifugal pump. Background Technology

[0002] Horizontal single-stage centrifugal pumps are a compact and widely used type of centrifugal pump. Existing lightweight stainless steel horizontal single-stage centrifugal pumps require high flatness of the sealing surfaces between the pump body and guide vanes, relying on tight contact between the two surfaces to achieve a seal. This places high demands on the precision of the stamping dies and the skill level of the operators, resulting in a high product scrap rate. Furthermore, the poor flatness of the sealing surfaces between the pump body and guide vanes in existing lightweight stainless steel horizontal single-stage centrifugal pumps cannot effectively prevent internal leakage, thus reducing pump operating efficiency and stability. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a structure for preventing internal leakage of a horizontal single-stage centrifugal pump. It effectively solves the problem of low efficiency caused by internal leakage of the pump due to poor flatness of the sealing surface between the pump body and the guide vane. Without damaging the hydraulic structure, the original structure is used to reduce volume loss by adding a secondary seal, thereby improving the pump efficiency.

[0004] The purpose of this utility model is achieved through the following technical solution: This structure for preventing internal leakage of a horizontal single-stage centrifugal pump includes a pump body, guide vanes, an impeller, and a motor. The pump body is provided with an inlet and an outlet. The motor drives the impeller through a motor shaft. The guide vanes are covered outside the impeller near the outlet. A mouth ring is installed at the inlet of the impeller near the inlet. The mouth ring abuts against the guide vanes, forming a preliminary seal between the pump body and the guide vanes. A sealing ring is installed at the stop step on the outer side of the sealing surface between the pump body and the guide vanes. After the sealing ring is squeezed by the pump body and the guide vanes, it forms an axial contact surface and a radial contact surface. The axial contact surface forms an axial seal with the guide vanes, and the radial contact surface forms a radial seal with the pump body.

[0005] As a further technical solution, a sealing seat plate is installed inside the pump body near the motor.

[0006] As a further technical solution, a mechanical seal is installed on the motor shaft, with the mechanical seal resting between the impeller and the sealing seat plate.

[0007] The beneficial effects of this utility model are as follows:

[0008] 1. Reduce manufacturing requirements and improve production qualification rate. The secondary sealing structure design forms a seal in both the axial and radial directions, which significantly reduces the requirements for the flatness and fitting accuracy of the stamping die (allowing tolerance to be increased by 30%~50%), effectively reducing the scrap rate caused by errors and increasing the first-pass yield of products to over 98%.

[0009] 2. To optimize sealing performance and eliminate the risk of internal leakage, a standard sealing ring is added at the step of the stop on the outer side of the sealing surface between the pump body and the guide vane to form an axial-radial composite seal. Actual tests show that this structure effectively reduces internal leakage, and the pump efficiency can be improved by about 5%.

[0010] 3. Easy to assemble and with a mature supply chain, standardized design, no need for customized molds, assembly process only requires conventional pressing tools, operators do not need special training, and assembly efficiency is high. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model.

[0012] Figure 2 for Figure 1 A magnified view of a portion of region A in the middle.

[0013] Explanation of reference numerals in the attached drawings: 1. Pump body; 2. Sealing ring; 3. Inlet ring; 4. Guide vane; 5. Impeller; 6. Sealing seat plate; 7. Mechanical seal; 8. Motor; 9. Motor shaft; 10. Axial contact surface; 11. Radial contact surface; 12. Inlet; 13. Outlet. Detailed Implementation

[0014] The present invention will now be described in detail with reference to the accompanying drawings:

[0015] Example: As attached Figure 1 , 2 As shown, this structure for preventing internal leakage of a horizontal single-stage centrifugal pump includes a pump body 1, a sealing ring 2, a mouth ring 3, a guide vane 4, an impeller 5, a sealing seat plate 6, a mechanical seal 7, a motor 8, a motor shaft 9, an axial contact surface 10, a radial contact surface 11, an inlet 12, and an outlet 13.

[0016] Reference Appendix Figure 1 The pump body 1 has an inlet 12 and an outlet 13. The motor 8 drives the impeller 5 via a motor shaft 9. A guide vane 4 is mounted on the outside of the impeller 5 near the outlet 13. A mouth ring 3 is installed at the inlet of the impeller 5 near the inlet 12. The mouth ring 3 abuts against the guide vane 4 and is located between the guide vane 4 and the pump body 1, forming a preliminary seal. Figure 2As shown, a sealing ring 2 is installed at the stop step on the outer side of the sealing surface of the pump body 1 and the guide vane 4. After the sealing ring 2 is squeezed by the pump body 1 and the guide vane 4, it forms an axial contact surface 10 and a radial contact surface 11. The axial contact surface 10 forms an axial seal after contacting the guide vane 4, and the radial contact surface 11 forms a radial seal after contacting the pump body 1.

[0017] Furthermore, a sealing seat plate 6 is installed inside the pump body 1 on the side near the motor 8. A mechanical seal 7 is installed on the motor shaft 9, and the mechanical seal 7 rests between the impeller 5 and the sealing seat plate 6.

[0018] The working process of this utility model:

[0019] This invention, based on the existing ring seal structure (preliminary seal), adds a composite sealing ring 2 at the step of the stop on the outer side of the sealing surface between the pump body 1 and the guide vane 4. This design achieves a dual sealing effect: a. Axial sealing: the sealing ring 2 and the end face of the guide vane 4 form an axial sealing interface; b. Radial sealing: the sealing ring 2 and the stop of the pump body 1 form a radial sealing interface. This significantly reduces the risk of internal leakage, lowers the flatness requirement of the sealing surface by approximately 40-50%, and improves pump efficiency.

[0020] Furthermore, this utility model reduces manufacturing requirements and improves the production qualification rate. By adopting a secondary sealing structure design, the requirements for the flatness and fitting accuracy of the stamping die are significantly reduced (allowing tolerance to be increased by 30%~50%), effectively reducing the scrap rate caused by errors and increasing the first-pass yield of products to over 98%.

[0021] Terminology Explanation:

[0022] Guide vanes: These are parts that collect the medium flowing out of the impeller and transport it to the pump body;

[0023] Pump body: The outer casing of the pump, which houses the impeller, guide vanes and the medium. It is the main component that converts the kinetic energy of the medium thrown out by the impeller into static pressure energy and guides the medium to the outlet.

[0024] Sealing ring: A ring-shaped elastic element used to fill the gap between two mating surfaces to prevent fluid leakage.

[0025] It is understood that, for those skilled in the art, any equivalent substitutions or modifications to the technical solutions and inventive concepts of this utility model should fall within the protection scope of the appended claims.

Claims

1. A structure for preventing internal leakage in a horizontal single-stage centrifugal pump, characterized in that: The pump body (1), guide vane (4), impeller (5) and motor (8) are included. The pump body (1) is provided with an inlet (12) and an outlet (13). The motor (8) is connected to drive the impeller (5) through the motor shaft (9). The guide vane (4) is covered outside the impeller (5) near the outlet (13). A mouth ring (3) is installed at the mouth of the impeller (5) near the inlet (12). The mouth ring (3) abuts against the guide vane (4) to form a preliminary seal between the pump body (1) and the guide vane (4). A sealing ring (2) is installed at the stop step on the outside of the sealing surface between the pump body (1) and the guide vane (4). After the sealing ring (2) is squeezed by the pump body (1) and the guide vane (4), an axial contact surface (10) and a radial contact surface (11) are formed. The axial contact surface (10) forms an axial seal with the guide vane (4), and the radial contact surface (11) forms a radial seal with the pump body (1).

2. The structure for preventing internal leakage of a horizontal single-stage centrifugal pump according to claim 1, characterized in that: A sealing seat plate (6) is installed inside the pump body (1) near the motor (8).

3. The structure for preventing internal leakage of a horizontal single-stage centrifugal pump according to claim 2, characterized in that: A mechanical seal (7) is installed on the motor shaft (9), and the mechanical seal (7) rests between the impeller (5) and the sealing seat plate (6).

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