Mechanical sealing device of horizontal single-stage centrifugal pump

Abstract

The utility model discloses a horizontal type single-stage centrifugal pump mechanical sealing device which comprises a pump shaft, a sealing assembly is arranged on the pump shaft in a matched mode, the sealing assembly comprises a first-stage sealing mechanism and a second-stage sealing mechanism, the first-stage sealing mechanism comprises a static ring assembly and a movable ring assembly, the static ring assembly is installed in a matched mode through an end cover, and the movable ring assembly is installed in a matched mode through the end cover. The movable ring assembly is installed in a matched mode through a sealing spring seat, a second-stage sealing cavity groove is further formed in the sealing spring seat, a second-stage sealing mechanism is arranged in the second-stage sealing cavity groove in a matched mode, a spring end cover is further arranged on the pump shaft in a matched mode, and a compression spring is arranged between the spring end cover and the sealing spring seat in a matched mode. According to the optimal design, the sealing spring seat structure is adopted, the compression spring is combined, the sealing assembly and the sealing spring seat are correspondingly matched, and the compression spring is used for improving the sealing abutting effect between the movable ring and the static ring.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of mechanical seal, concretely relates to a horizontal single-stage centrifugal pump mechanical seal device. BACKGROUND

[0002] The centrifugal pump works by using the rotation of the impeller to make water move centrifugally. Before starting, the pump casing and the water suction pipe must be filled with water, then the motor is started to make the pump shaft drive the impeller and water to rotate at high speed, and the water moves centrifugally and is thrown to the outer edge of the impeller, and then flows into the water pressure pipe of the water pump through the flow channel of the volute pump casing. In the use process of the centrifugal pump, mechanical seal device is often used to prevent leakage. The use effect of the mechanical seal plays a decisive role in the stability, service life and operation cost of the pump.

[0003] The existing mechanical seal device for centrifugal pump has some leakage points in the use process. However, due to the conventional structure of the seal, it is difficult to achieve the best sealing effect, and leakage or short service life often occurs, which increases the cost of the product and brings inconvenience to the users. Therefore, in view of the above status, it is urgent to develop a mechanical seal device for centrifugal pump to overcome the shortcomings in the current actual application. CONTENT OF THE UTILITY MODEL

[0004] In order to make up for the shortcomings of the prior art, the utility model aims at providing a horizontal single-stage centrifugal pump mechanical seal device, which realizes double-stage sealing structure and increases the sealing effect. To achieve this goal, the specific technical scheme of the utility model is as follows:

[0005] The horizontal single-stage centrifugal pump mechanical seal device comprises a pump shaft, a sealing assembly is arranged on the pump shaft in cooperation, the sealing assembly comprises a first-stage sealing mechanism and a second-stage sealing mechanism, the first-stage sealing mechanism comprises a static ring assembly and a dynamic ring assembly, the static ring assembly is installed in cooperation through an end cover, the dynamic ring assembly is installed in cooperation through a sealing spring seat, a second-stage sealing cavity groove is further arranged in the sealing spring seat, the second-stage sealing cavity groove is matched with the second-stage sealing mechanism, a spring end cover is further matched with the pump shaft, and a compression spring is matched between the spring end cover and the sealing spring seat.

[0006] Further, the spring end cover and the sealing spring seat are fixed with the pump shaft, the sealing spring seat is provided with a first-stage sealing cavity groove and a second-stage sealing cavity groove, the dynamic ring assembly is assembled in the first-stage sealing cavity groove, and the second-stage sealing mechanism is assembled in the second-stage sealing cavity groove; and the annular outer wall of the sealing spring seat forms a step through the first-stage sealing cavity groove and the second-stage sealing cavity groove, one end of the compression spring is clamped on the step, and the other end is placed in the spring end cover.

[0007] Further, the dynamic ring assembly comprises a dynamic ring body and a dynamic ring gasket, and the dynamic ring gasket is a rectangular ring.

[0008] Further, the secondary sealing mechanism comprises an O-shaped ring.

[0009] Further, the static ring assembly comprises a static ring body and a static ring rubber ring.

[0010] Further, the compression spring adopts a tower-shaped spring.

[0011] Compared with the prior art, the utility model has the following advantages:

[0012] The application optimizes the design to adopt a sealing spring seat structure, combines a compression spring, and correspondingly matches the sealing assembly with the sealing spring seat, so as to increase the sealing resistance effect between the dynamic ring and the static ring. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a cross-sectional schematic view of the centrifugal pump of the utility model;

[0014] Figure 2 It is a schematic view of the mechanical sealing device of the utility model (namely Figure 1 the enlarged view of A in the middle).

[0015] In the figure: 1-pump shaft, 2-static ring assembly, 21-static ring body, 22-static ring rubber ring, 3-dynamic ring assembly, 31-dynamic ring body, 32-dynamic ring gasket, 4-end cover, 5-sealing spring seat, 6-secondary sealing mechanism, 7-spring end cover, 8-compression spring. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical scheme and advantages of the application more clear, the application will be further described in detail below in combination with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the application and not to limit the application.

[0017] As shown in Figure 1 and Figure 2 A horizontal single-stage centrifugal pump mechanical sealing device, comprising a pump shaft 1, a sealing assembly is arranged on the pump shaft 1 in cooperation, the sealing assembly comprises a primary sealing mechanism and a secondary sealing mechanism, the primary sealing mechanism comprises a static ring assembly 2 and a dynamic ring assembly 3, the static ring assembly 2 is installed in cooperation through an end cover 4, the dynamic ring assembly 3 is installed in cooperation through a sealing spring seat 5, and a secondary sealing cavity groove is further arranged in the sealing spring seat 5, and the secondary sealing cavity groove is matched with a secondary sealing mechanism 6; the pump shaft 1 is further matched with a spring end cover 7, and a compression spring 8 is matched between the spring end cover 7 and the sealing spring seat 5.

[0018] In the embodiment, the spring end cover 7 and the sealing spring seat 5 are fixed with the pump shaft 1, the spring end cover 7 is clamped on the pump shaft 1, and one side end surface is connected with the impeller. The sealing spring seat 5 is provided with a primary sealing cavity groove and a secondary sealing cavity groove, the primary sealing cavity groove is assembled with the dynamic ring assembly 3, and the secondary sealing cavity groove is assembled with the secondary sealing mechanism 6; and the annular outer wall of the sealing spring seat 5 forms a step through the primary sealing cavity groove and the secondary sealing cavity groove, one end of the compression spring 8 is clamped on the step, and the other end is arranged in the spring end cover 7.

[0019] Specifically, the static ring assembly 2 comprises a static ring body 21 and a static ring rubber ring 22. The dynamic ring assembly 3 comprises a dynamic ring body 31 and a dynamic ring gasket 32, and the dynamic ring gasket 32 adopts a rectangular ring. The secondary sealing mechanism 6 comprises an O-shaped ring. In addition, the end cover 4 is provided with an annular groove on one side, and the static ring rubber ring 22 is provided with a convex ring for clamping with the annular groove, so as to increase the friction force between the end cover 4 and the static ring rubber ring 22.

[0020] In a specific embodiment, the compression spring 8 preferably adopts a tower-shaped spring.

[0021] The sealing assembly (the primary sealing mechanism and the secondary sealing mechanism) is optimized and designed in the application, the sealing spring seat 5 structure is adopted, the compression spring 8 is combined, the sealing assembly is correspondingly matched with the sealing spring seat 5, and the compression spring 8 is used to increase the sealing resistance effect between the dynamic ring and the static ring.

[0022] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the utility model, but not to limit them; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: the technical solutions recorded in the foregoing embodiments can still be modified, or part or all of the technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A mechanical seal assembly for a horizontal single stage centrifugal pump comprising a pump shaft, characterized by: The pump shaft is provided with a sealing assembly, the sealing assembly comprises a primary sealing mechanism and a secondary sealing mechanism, the primary sealing mechanism comprises a static ring assembly and a dynamic ring assembly, the static ring assembly is installed through a cover, the dynamic ring assembly is installed through a sealing spring seat, the sealing spring seat is further provided with a secondary sealing cavity, the secondary sealing cavity is provided with a secondary sealing mechanism, the pump shaft is further provided with a spring cover, and the spring cover is provided with a compression spring between the sealing spring seat.

2. A mechanical seal device for a horizontal single-stage centrifugal pump according to claim 1, characterized in that, The spring cover and the sealing spring seat are fixed to the pump shaft, the sealing spring seat is provided with a primary sealing cavity and a secondary sealing cavity, the dynamic ring assembly is assembled in the primary sealing cavity, and the secondary sealing mechanism is assembled in the secondary sealing cavity; and the annular outer wall of the sealing spring seat is formed with a step through the primary sealing cavity and the secondary sealing cavity, one end of the compression spring is clamped on the step, and the other end is arranged in the spring cover.

3. A mechanical seal device for a horizontal single-stage centrifugal pump according to claim 2, characterized in that, The dynamic ring assembly comprises a dynamic ring body and a dynamic ring gasket, and the dynamic ring gasket is a rectangular ring.

4. A mechanical seal device for a horizontal single-stage centrifugal pump according to claim 2, wherein The secondary sealing mechanism comprises an O-shaped ring.

5. A mechanical seal device for a horizontal single-stage centrifugal pump according to any one of claims 1 to 4, characterized in that, The static ring assembly comprises a static ring body and a static ring rubber ring.

6. A mechanical seal device for a horizontal single-stage centrifugal pump according to any one of claims 1 to 4, characterized in that, The compression spring is a tower-shaped spring.

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