Rotary 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 a rotary sealing structure for a self-priming pump and the self-priming pump. The pump comprises a pump body, a pump shaft, a mechanical seal, an extension part and a power sealing sleeve. The pump shaft is rotationally connected into the pump body; the mechanical seal is connected between the pump shaft and the pump body; the extension part is arranged on the pump shaft in the pump body in a sleeving manner, the extension part is connected with the pump body close to the mechanical seal, and a compression cavity with an opening facing the direction away from the mechanical seal is formed between the extension part and the pump shaft; the power sealing sleeve is connected with the pump shaft and arranged in the compression cavity in a matched mode, and the rotating power sealing sleeve generates thrust towards the opening direction. The sealing structure is used for solving the problem that impurities easily enter a seal from a gap between a pump body and a pump shaft. The power sealing sleeve is connected between the extending part and the pump shaft, the power sealing sleeve is driven by the pump shaft to rotate to generate pressure reverse thrust, and then dirty impurities in medium water are prevented from entering a cavity where the mechanical seal above is located.

Description

Technical Field

[0001] The utility model belongs to the technical field of self-priming pump seals, and particularly relates to a rotary seal 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] The skeleton oil seal in the self-priming pump is generally composed of a skeleton, a spring, a sealing ring, etc. It has a relatively simple structure and is relatively easy to install. It does not require high structural design of the pump and has a relatively low cost. However, the rubber in the skeleton oil seal is easy to age and break, and the service life is short. In comparison, the service life of the mechanical seal is longer, reducing the number of pump failures and repairs caused by sealing problems.

[0004] However, mechanical seals have high requirements for the operating environment. For example, if the medium water in the self-priming pump is relatively dirty, during long-term operation, particles in the medium water will enter the sealing surface of the mechanical seal from the gap between the pump body and the pump shaft, causing damage to the sealing effect. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a rotary seal structure for a self-priming pump, which is used to solve the problem that impurities easily enter the seal through the gap between the pump body and the pump shaft.

[0006] On the one hand, the technical solution of the present invention to solve the above technical problems is as follows: a rotary seal structure for a self-priming pump, comprising:

[0007] Pump body;

[0008] a pump shaft, rotatably connected to the pump body;

[0009] A mechanical seal connected between the pump shaft and the pump body;

[0010] an extension portion, sleeved on the pump shaft inside the pump body, the extension portion being connected to the pump body near the mechanical seal, and forming a compression chamber between the extension portion and the pump shaft, the compression chamber opening facing away from the mechanical seal;

[0011] A power sealing sleeve is connected to the pump shaft and is matched with and arranged in the compression chamber. The rotating power sealing sleeve generates thrust toward the opening direction.

[0012] Compared with the existing technology, the above technical solution has the following technical effects:

[0013] An extension is formed by extending the pump body into the interior of the pump body at the connection between the pump body and the pump shaft. A dynamic sealing sleeve is connected between the extension and the pump shaft. The dynamic sealing sleeve rotates under the drive of the pump shaft to generate pressure reverse thrust, thereby preventing dirty impurities in the medium water from entering the cavity where the mechanical seal above is located through the gap here, which can extend the service life of the mechanical seal.

[0014] Based on the above technical solution, the embodiment of the present application can also be improved as follows:

[0015] In one embodiment, a first spiral guide groove is formed on the outer periphery of the power sealing sleeve.

[0016] By providing a spiral guide groove on the power seal sleeve, pressure can be generated by squeezing better, and thrust toward the opening direction can be provided better, thereby preventing the medium in the pump from entering the mechanical seal.

[0017] In one embodiment, a second spiral guide groove is formed on the inner wall of the extension portion.

[0018] By opening a spiral guide groove on the inner wall of the extension part, the two spiral guide grooves squeeze each other during rotation, generating thrust, which returns the medium inside the pump body to the pump body, avoiding it from entering the mechanical seal and improving the service life of the mechanical seal.

[0019] In one embodiment, the first spiral guide groove and the second spiral guide groove are arranged opposite to each other, and the groove width of the two spiral guide grooves is 2-5 mm.

[0020] In one embodiment, the groove depth of the two spiral guide grooves is 2-5 mm.

[0021] In one embodiment, the power sealing sleeve is loosely fitted with the extension portion.

[0022] In one embodiment, the first spiral guide groove and the second spiral guide groove have the same rotation direction, and are opposite to the rotation direction of the pump shaft.

[0023] On the other hand, this embodiment also discloses a self-priming pump, which includes the above-mentioned rotary sealing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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.

[0025] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0026] Figure 2 for Figure 1 Schematic diagram of the enlarged structure at point A in the middle.

[0027] Reference numerals:

[0028] 1. Pump body; 2. Pump shaft; 3. Mechanical seal; 4. Extension; 5. Opening; 6. Compression chamber; 7. Power seal sleeve; 8. First spiral guide groove; 9. Second spiral guide groove. DETAILED DESCRIPTION

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] Example 1

[0035] like Figure 1-2As shown, the utility model provides a rotary seal structure for a self-priming pump, which includes: a pump body 1, a pump shaft 2, a mechanical seal 3 and an extension part 4 and a dynamic sealing sleeve 7.

[0036] The pump shaft 2 is rotatably connected to the pump body 1. The part of the pump shaft 2 inserted into the pump body 1 forms a mechanical seal 3 cavity for assembling the mechanical seal 3. The pump body 1 extends toward the inside of the pump body 1 and covers the outside of the mechanical seal 3. The mechanical seal 3 is connected between the pump shaft 2 and the pump body 1.

[0037] The extension portion 4 is a cylindrical structure, which is sleeved on the pump shaft 2 inside the pump body 1. The extension portion 4 is connected to the pump body 1 near the mechanical seal 3. Specifically, the extension portion 4 is integrally formed with the pump body 1. An opening 5 is formed between the extension portion 4 and the pump shaft 2, facing a compression chamber 6 away from the mechanical seal 3, that is, the opening 5 of the compression chamber 6 is arranged toward the interior of the pump body 1 below. The power sealing sleeve 7 is connected to the pump shaft 2 and rotates with the rotation of the pump shaft 2. The power sealing sleeve 7 is matched and arranged in the compression chamber 6. The rotating power sealing sleeve 7 generates thrust toward the opening 5.

[0038] An extension portion 4 is formed by extending toward the interior of the pump body 1 at the connection between the pump body 1 and the pump shaft 2. A dynamic sealing sleeve 7 is connected between the extension portion 4 and the pump shaft 2. The dynamic sealing sleeve 7 rotates under the drive of the pump shaft 2 to generate pressure reverse thrust, thereby preventing dirty impurities in the medium water from entering the cavity where the mechanical seal above is located through the gap here, thereby extending the service life of the mechanical seal.

[0039] Specifically, a first spiral guide groove 8 is provided on the outer periphery of the power sealing sleeve 7. By providing the spiral guide groove on the power sealing sleeve 7, pressure can be generated by squeezing better. When the pump shaft 2 rotates, the first spiral guide groove 8 provides a better downward thrust toward the opening 5 to prevent the medium in the pump from entering the mechanical seal 3.

[0040] Furthermore, a second spiral guide groove 9 is formed on the inner wall of the extension portion 4 .

[0041] By further providing a spiral guide groove on the inner wall of the extension portion 4 , the two spiral guide grooves squeeze each other during rotation to generate thrust, thereby returning the medium inside the pump body 1 to the pump body 1 and preventing it from entering the mechanical seal 3 , thereby increasing the service life of the mechanical seal 3 .

[0042] Specifically, the first spiral guide groove 8 and the second spiral guide groove 9 have the same rotation direction, so that the first spiral guide groove 8 on the power sealing sleeve 7 can better squeeze each other with the second spiral guide groove 9 to generate thrust when rotating, and both are opposite to the rotation direction of the pump shaft 2, so that when the pump shaft 2 rotates, it can generate downward thrust.

[0043] Among them, the first spiral guide groove 8 and the second spiral guide groove 9 are arranged opposite to each other, forming a manner in which the notch of the first spiral guide groove 8 is opposite to the notch of the second spiral guide groove 9, and the groove width of the two spiral guide grooves is 2-5mm, and the groove width of the first spiral guide groove 8 and the second spiral guide groove 9 is set to be the same and relatively arranged.

[0044] Specifically, the groove depth of the two spiral guide grooves is 2-5 mm, which increases the extrusion space and generates a better thrust without affecting the structural strength of the extension part 4 and the power sealing sleeve 7.

[0045] In order to ensure that the power sealing sleeve 7 and the extension portion 4 do not interfere with each other in rotation, the power sealing sleeve 7 and the extension portion 4 are clearance-matched, and the clearance can be set to about 1-2 mm.

[0046] Example 2

[0047] This embodiment also discloses a self-priming pump, which includes the rotary sealing structure in Example 1. The rotary 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 performs a sealing function there.

[0048] 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. A rotary seal structure for a self-priming pump, characterized in that: include: Pump body; a pump shaft, rotatably connected to the pump body; A mechanical seal connected between the pump shaft and the pump body; an extension portion, sleeved on the pump shaft inside the pump body, the extension portion being connected to the pump body near the mechanical seal, and forming a compression chamber between the extension portion and the pump shaft, the compression chamber opening facing away from the mechanical seal; A power sealing sleeve is connected to the pump shaft and is matched with and arranged in the compression chamber. The rotating power sealing sleeve generates thrust toward the opening direction.

2. The rotary seal structure for a self-priming pump according to claim 1, characterized in that: A first spiral guide groove is provided on the outer periphery of the power sealing sleeve.

3. The rotary seal structure for a self-priming pump according to claim 2, characterized in that: A second spiral guide groove is formed on the inner wall of the extension portion.

4. The rotary seal structure for a self-priming pump according to claim 3, characterized in that: The first spiral guide groove and the second spiral guide groove are arranged opposite to each other, and the groove width of the two spiral guide grooves is 2-5 mm.

5. The rotary seal structure for a self-priming pump according to claim 4, characterized in that: The groove depth of the two spiral guide grooves is 2-5 mm.

6. The rotary seal structure for a self-priming pump according to claim 2, characterized in that: The power sealing sleeve is loosely matched with the extension portion.

7. The rotary seal structure for a self-priming pump according to claim 3, characterized in that: The first spiral guide groove and the second spiral guide groove have the same rotation direction, and are both opposite to the rotation direction of the pump shaft.

8. A self-priming pump, characterized in that: It comprises the rotary sealing structure as described in any one of claims 1-7.

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