Auxiliary sealing structure for self-priming pump and self-priming pump

Abstract

The utility model belongs to the technical field of self-priming pump sealing, and particularly relates to an auxiliary sealing structure for a self-priming pump and the self-priming pump. The auxiliary sealing structure comprises a pump body, a mechanical seal and a power sealing mechanism, and a pump shaft is connected in the pump body; the mechanical seal is arranged between the pump shaft and the pump body; the power sealing mechanism is arranged on the pump shaft in the pump body, the power sealing mechanism is located at a gap, entering the mechanical seal, between the pump body and the pump shaft, and the power sealing mechanism rotates along with the pump shaft to generate pressure in the direction away from the mechanical seal. The utility model is used for solving the problem that the mechanical seal of the self-priming pump is easily worn by particles in medium water. The power sealing mechanism below the mechanical seal can rotate along with the pump shaft, and the rotating power sealing mechanism can generate downward pressure to seal dirty media in the pump body, so that the dirty media are prevented from entering the mechanical seal, and damage to the mechanical seal caused by the dirty media is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of self-priming pump seals, and in particular relates to an auxiliary sealing structure for a self-priming pump and the self-priming pump. Background Art

[0002] A self-priming pump is a centrifugal pump or vortex pump that automatically exhausts the air in the suction pipe and draws in liquid without priming before starting. It is widely used in many situations where liquid needs to be pumped.

[0003] In self-priming pumps, skeleton oil seals or mechanical seals are usually installed between the pump shaft and the pump casing to seal the gap between the pump body and the pump shaft. The skeleton oil seal has a relatively simple structure, is easy to install, and has a low cost. However, the sealing effect of the skeleton oil seal is limited, and its service life is short and it is prone to aging and wear. Mechanical seals have good sealing performance and a long service life. However, mechanical seals are still prone to wear and tear due to particles in the dirty medium water entering their sealing surfaces, which can lead to mechanical seal failure. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide an auxiliary sealing structure for a self-priming pump, which is used to solve the problem that the mechanical seal of the self-priming pump is easily worn by particles in the medium water.

[0005] On the one hand, the technical solution of the present invention to solve the above technical problems is as follows: an auxiliary sealing structure for a self-priming pump, comprising:

[0006] a pump body, wherein a pump shaft is connected to the pump body;

[0007] A mechanical seal is provided between the pump shaft and the pump body;

[0008] A dynamic sealing mechanism is provided on the pump shaft inside the pump body. The dynamic sealing mechanism is located at the gap between the pump body and the pump shaft entering the mechanical seal. The dynamic sealing mechanism rotates with the pump shaft to generate pressure in a direction away from the mechanical seal.

[0009] Compared with the existing technology, the above technical solution has the following beneficial effects:

[0010] The dynamic sealing mechanism below the mechanical seal will rotate with the pump shaft. The rotating dynamic sealing mechanism can generate downward pressure to seal the medium inside the pump body, preventing the dirty medium from entering the mechanical seal and avoiding damage to the mechanical seal caused by the dirty medium.

[0011] Based on the above technical solution, the embodiment of the present application can also be improved as follows:

[0012] In one embodiment, the dynamic sealing mechanism includes an auxiliary impeller, which is mounted on the pump shaft and has a clearance fit with the pump body. A plurality of blades are provided on a side of the auxiliary impeller close to the mechanical seal.

[0013] In one embodiment, the blades are spiral blades, and the spiral blades are evenly spaced along the circumference of the auxiliary impeller.

[0014] In one embodiment, the gap between the auxiliary impeller and the pump body is 1-3 mm.

[0015] In one embodiment, the rotation direction of the spiral blade is the same as the rotation direction of the pump shaft.

[0016] On the other hand, this embodiment also discloses a self-priming pump, which includes the auxiliary sealing structure mentioned above. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0019] Figure 2 for Figure 1 Schematic diagram of the structure of the middle and auxiliary impellers.

[0020] Reference numerals:

[0021] 1. Pump body; 2. Pump shaft; 3. Mechanical seal; 4. Dynamic sealing mechanism;

[0022] 401. Auxiliary impeller; 402. Blade. DETAILED DESCRIPTION

[0023] The following embodiments of the technical solution of the present invention are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0024] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which this utility model belongs.

[0025] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] In addition, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of this utility model, "plurality" means more than two, unless otherwise specifically defined.

[0027] In this application, unless otherwise expressly specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0028] Example 1

[0029] like Figure 1-2 As shown, in order to prevent dirty water in the pump from entering the upper mechanical seal 3 through the gap between the pump body 1 and the pump shaft 2, thereby affecting the life of the mechanical seal 3, the utility model provides an auxiliary sealing structure for a self-priming pump, which includes: a pump body 1, a mechanical seal 3 and a dynamic sealing mechanism 4, wherein the mechanical seal 3 is a mechanical seal.

[0030] A pump shaft 2 is connected to the pump body 1, and a mechanical seal 3 is provided between the pump shaft 2 and the pump body 1. Specifically, the contact position between the pump body 1 and the pump shaft 2 extends toward the inside of the pump body 1, forming a mechanical seal 3 cavity between the pump body 1 and the pump shaft 2 for matching and installing the mechanical seal 3. The inward extension position of the pump body 1 covers the outside of the mechanical seal 3, and the pump shaft 2 is sleeved on the center of the mechanical seal 3. However, there is still a certain gap between the pump body 1 and the pump shaft 2 below the mechanical seal 3.

[0031] The dynamic sealing mechanism 4 is arranged on the pump shaft 2 inside the pump body 1. The dynamic sealing mechanism 4 is located at the gap between the pump body 1 and the pump shaft 2 entering the mechanical seal 3. The dynamic sealing mechanism 4 rotates with the pump shaft 2 to generate pressure in the direction away from the mechanical seal 3.

[0032] The dynamic sealing mechanism 4 below the mechanical seal 3 will rotate along with the pump shaft 2. The rotating dynamic sealing mechanism 4 can generate downward pressure to seal the medium inside the pump body 1, preventing the dirty medium from entering the mechanical seal 3, thereby avoiding damage to the mechanical seal 3 caused by the dirty medium.

[0033] Specifically, the dynamic sealing mechanism 4 includes an auxiliary impeller 401, which is installed on the pump shaft 2. The auxiliary impeller 401 is clearance-matched with the pump body 1. The clearance between the auxiliary impeller 401 and the pump body 1 is mainly to facilitate the rotation of the auxiliary impeller 401 and avoid friction between the auxiliary impeller 401 and the pump body 1. At the same time, a plurality of blades 402 are provided on the side of the auxiliary impeller 401 close to the mechanical seal 3. When the pump shaft 2 rotates, the blades 402 on the side of the auxiliary impeller 401 close to the mechanical seal 3 generate positive pressure during the rotation process, and press the water flow downward as a whole, that is, the gap between the auxiliary impeller 401 and the pump body 1 generates positive pressure, so that dirty media cannot enter the gap.

[0034] Among them, the blade 402 is a spiral blade 402, and the spiral blade 402 is evenly spaced along the circumference of the auxiliary impeller 401. One end of the spiral blade 402 is connected to the center of the auxiliary impeller 401, and the other end extends outward along the spiral direction to the edge of the auxiliary impeller 401. During the rotation process, the spiral blade 402 on the auxiliary impeller 401 can generate a better and larger positive pressure, thereby preventing impurities from entering the upper mechanical seal 3.

[0035] Specifically, the gap between the auxiliary impeller 401 and the pump body 1 is 1-3 mm, which is sufficient to ensure that the auxiliary impeller 401 does not rub against the pump body 1 during rotation, while the gap is not so large that it is difficult to maintain the positive pressure there.

[0036] During the rotation of the pump shaft 2 , the rotation direction of the spiral blade 402 is the same as that of the pump shaft 2 .

[0037] Example 2

[0038] This embodiment also discloses a self-priming pump, which includes the auxiliary sealing structure in Example 1. The auxiliary sealing structure is installed on the pump shaft inside the pump body, close to the gap between the pump body and the pump shaft, and plays a sealing role there.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An auxiliary sealing structure for a self-priming pump, characterized in that: include: a pump body, wherein a pump shaft is connected to the pump body; A mechanical seal is provided between the pump shaft and the pump body; A dynamic sealing mechanism is provided on the pump shaft inside the pump body. The dynamic sealing mechanism is located at the gap between the pump body and the pump shaft entering the mechanical seal. The dynamic sealing mechanism rotates with the pump shaft to generate pressure in a direction away from the mechanical seal.

2. The auxiliary sealing structure for a self-priming pump according to claim 1, characterized in that: The dynamic sealing mechanism includes an auxiliary impeller, which is mounted on the pump shaft and has clearance fit with the pump body. A plurality of blades are provided on a side of the auxiliary impeller close to the mechanical seal.

3. The auxiliary sealing structure for a self-priming pump according to claim 2, characterized in that: The blades are spiral blades, and the spiral blades are evenly spaced along the circumference of the auxiliary impeller.

4. The auxiliary sealing structure for a self-priming pump according to claim 2, characterized in that: The gap between the auxiliary impeller and the pump body is 1-3 mm.

5. The auxiliary sealing structure for a self-priming pump according to claim 3, characterized in that: The rotation direction of the spiral blade is the same as that of the pump shaft.

6. A self-priming pump, characterized in that: It comprises the auxiliary sealing structure as described in any one of claims 1-5.

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