Wear-resistant sealing structure for centrifugal pump

Abstract

According to the technical scheme, the wear-resistant sealing structure for the centrifugal pump is characterized in that the wear-resistant sealing structure comprises a rotating assembly, a static assembly and a spring assembly, and the rotating assembly comprises a movable ring and a transmission sleeve; the static assembly comprises a static ring and a static ring sleeve; the spring assembly comprises an elastic tube and a spring; one end of the elastic pipe is located in the transmission sleeve and abuts against the movable ring, and the movable ring is pushed to abut against the static ring. One end of the spring is located in the transmission sleeve and abuts against the elastic pipe to push the movable ring to abut against the static ring. The moving ring and the static ring are made of graphite materials; an annular limiting notch matched with the transmission sleeve is formed in the movable ring; the transmission sleeve is provided with a bent edge used for being matched with the limiting notch. The wear-resistant sealing structure for the centrifugal pump has the beneficial effects of being resistant to wear, convenient to install, capable of reducing the installation space and even in sealing face wear.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical seal, in particular to a wear-resistant sealing structure for centrifugal pump. BACKGROUND

[0002] As a kind of fluid conveying equipment widely used in industrial field, the reliability and stability of centrifugal pump performance is crucial. As one of the key components of centrifugal pump, sealing structure plays a decisive role in preventing fluid leakage in pump and maintaining normal operation of pump. The existing mechanical seal structure has the problem of wear and tear of static ring and dynamic ring after long time use, which affects the sealing performance. Moreover, the existing sealing structure provides elastic force and realizes elastic deformation under external force through corrugated pipe structure, which has long length and requires large installation space, and is not convenient to install. CONTENT OF THE INVENTION

[0003] The purpose of the embodiment of the present application is to provide a wear-resistant sealing structure for centrifugal pump to solve the technical problems existing in the prior art.

[0004] To achieve the above purpose, the technical solution adopted by the present application is to provide a wear-resistant sealing structure for centrifugal pump, comprising a rotating component, a static component and a spring component. The rotating component comprises a dynamic ring and a transmission sleeve. The static component comprises a static ring and a static ring sleeve. The spring component comprises an elastic tube and a spring. One end of the elastic tube is located in the transmission sleeve and abuts against the dynamic ring to push the dynamic ring to abut against the static ring. One end of the spring is located in the transmission sleeve and abuts against the elastic tube to push the dynamic ring to abut against the static ring.

[0005] Through the above technical solution, the transmission sleeve can keep the dynamic ring concentric with the pump shaft during rotation, prevent the dynamic ring from radial deviation, avoid uneven wear and tear of the sealing surface of the dynamic ring and the static ring, and ensure the sealing performance. The elastic tube is made of elastic material and deforms under external force. One end of the elastic tube is located in the transmission sleeve and cooperates with the spring to effectively push the dynamic ring. After wear and tear of the dynamic ring and the static ring, no gap is generated to ensure the sealing performance and achieve the effect of wear resistance.

[0006] Optionally, the dynamic ring and the static ring are made of graphite material. An annular limiting notch is formed on the dynamic ring and cooperates with the transmission sleeve. A bending edge is arranged on the transmission sleeve and cooperates with the limiting notch.

[0007] Optionally, a protruding end is formed on the end of the dynamic ring. The protruding end abuts against the end surface of the static ring. The limiting notch is located on the outer peripheral surface of the protruding end.

[0008] Through the technical scheme, the flatness of the sealing surface of the dynamic ring and the static ring is within three light bands when the material is graphite and within two light bands when the material is other materials, the convex end cooperates with the end surface of the static ring, when the dynamic ring rotates with the pump shaft, the dynamic ring rotates relative to the static ring, the graphite has self-lubricating property, and the interlayer sliding can reduce friction and abrasion.

[0009] Optionally, the transmission sleeve is provided with a pressing ring; the pressing ring abuts against the elastic tube; one end of the spring abuts against the pressing ring; and the edge of the transmission sleeve is folded back to form a folded edge for limiting the pressing ring.

[0010] Through the technical scheme, the pressing ring can fix the elastic tube in the transmission sleeve under the pressure of the spring, and the elastic force of the spring and the elastic tube can be better applied to the dynamic ring; and the folded edge formed by the edge of the transmission sleeve can limit the pressing ring to prevent the pressing ring from being separated.

[0011] Optionally, the spring is a conical spring; the spring comprises a large end and a small end; the large end of the spring abuts against the pressing ring, and the small end abuts against the spring cover.

[0012] Through the technical scheme, the spring is a conical structure, and under the same compression stroke and bearing capacity, the conical spring occupies less axial space than a cylindrical spiral spring, so that the installation space can be effectively saved, and the volume of the centrifugal pump is reduced, facilitating use and installation.

[0013] Optionally, the elastic tube is limited by the spring cover; the elastic tube is provided in a horn shape; an annular protrusion is arranged on the outer circumferential surface of the end of the elastic tube that cooperates with the spring cover; and the cross section of the spring cover is provided in a stepped shape to cooperate with the annular protrusion for limiting.

[0014] Through the technical scheme, the horn-shaped elastic tube can elastically deform under external force, the length of the elastic tube is relatively short compared with that of the corrugated tube, and the annular protrusion can be limited by the spring cover on the centrifugal pump to achieve the elastic effect.

[0015] Optionally, the edge of the elastic tube away from the spring cover is folded back to form a folded ring; the cross section of the pressing ring is provided in an L shape; the pressing ring abuts against the side surface of the folded ring; the other side of the folded ring away from the pressing ring is provided with a protruding ring; and a gap is arranged on the outer circumferential surface of the end of the dynamic ring to cooperate with the protruding ring.

[0016] Through the technical scheme, the folded ring makes the elastic tube in a horn shape and facilitates cooperation with the pressing ring, and the gap on the dynamic ring can be limited by the protruding ring to prevent the dynamic ring from loosening when abutting against the protruding ring.

[0017] The application has the beneficial effects of wear resistance, convenient installation, reduced installation space, and uniform wear of the sealing surface compared with the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only a part of the application, and other drawings can also be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0019] Figure 1 The application is a cross-sectional schematic diagram of an embodiment.

[0020] Figure 2 The application is a cross-sectional diagram of an embodiment.

[0021] In the drawings, reference numerals 1, static ring sleeve; 2, static ring; 3, dynamic ring; 4, transmission sleeve; 5, spring; 6, spring cover; 7, elastic tube; 8, pressing ring; 9, limiting notch; 10, bent edge; 11, protruding end; 12, backfolding edge; 13, annular protrusion; 14, backfolding ring; 15, protruding ring; 16, give-way notch. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the application more clear, the application will be further described in detail below in combination with specific embodiments.

[0023] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0024] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0025] In addition, the terms "first", "second", etc. are used only for descriptive purposes and should not be construed as implying or suggesting relative importance or an indicated number of the technical features. Therefore, the features defined as "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "several" is two or more, unless otherwise specifically limited.

[0026] As shown in Figure 1 、 Figure 2 The purpose of the embodiments of the present application is to provide a wear-resistant sealing structure for a centrifugal pump to solve the technical problems existing in the prior art.

[0027] To achieve the above-mentioned purpose, the technical solution adopted by the present application is to provide a wear-resistant sealing structure for a centrifugal pump, comprising a rotating assembly, a stationary assembly and a spring assembly, the rotating assembly comprising a dynamic ring 3 and a transmission sleeve 4; the stationary assembly comprising a static ring 2 and a static ring sleeve 1; the spring assembly comprising an elastic tube 7 and a spring 5; one end of the elastic tube 7 is located in the transmission sleeve 4 and abuts against the dynamic ring 3, pushing the dynamic ring 3 to abut against the static ring 2; one end of the spring 5 is located in the transmission sleeve 4 and abuts against the elastic tube 7, pushing the dynamic ring 3 to abut against the static ring 2.

[0028] Through the above technical solution, the transmission sleeve 4 can keep the dynamic ring 3 concentric with the pump shaft during rotation, prevent the dynamic ring 3 from radial deviation, avoid uneven wear of the sealing surface of the dynamic ring 3 and the static ring 2, and ensure the sealing performance; the elastic tube 7 is made of elastic material and deforms under external force, one end of which is located in the transmission sleeve 4 and cooperates with the spring 5, which can effectively push the dynamic ring 3, and after the dynamic ring 3 and the static ring 2 wear, no gap is generated, ensuring the sealing performance; and the effect of wear resistance is achieved.

[0029] Optionally, the dynamic ring 3 and the static ring 2 are made of graphite material; an annular limiting notch 9 is formed on the dynamic ring 3 and cooperates with the transmission sleeve 4; and a bending edge 10 is arranged on the transmission sleeve 4 and cooperates with the limiting notch 9.

[0030] Optionally, a protruding end 11 is formed at the end of the dynamic ring 3; the protruding end 11 abuts against the end face of the static ring 2; and the limiting notch 9 is located on the outer peripheral surface of the protruding end 11.

[0031] With the above technical solution, the flatness of the sealing surfaces of the rotating ring 3 and the stationary ring 2 is within three light bands when the material is graphite, and within two light bands for other materials. Through the cooperation between the protruding end 11 and the end face of the stationary ring 2, when the rotating ring 3 rotates with the pump shaft, the rotating ring 3 rotates relative to the stationary ring 2. Graphite has self-lubricating properties, and interlayer sliding can reduce friction and reduce wear. By opening the limiting notch 9, the area of ​​the protruding end 11 relative to the end face of the stationary ring 2 is smaller. When the stationary ring 2 wears, the contact area with the rotating ring 3 increases, which can enhance the sealing effect.

[0032] Optionally, a pressure ring 8 is provided inside the transmission sleeve 4; the pressure ring 8 abuts against the elastic tube 7; one end of the spring 5 abuts against the pressure ring 8; the edge of the transmission sleeve 4 is folded back to form a folded edge 12 to limit the pressure ring 8.

[0033] With the above technical solution, the pressure ring 8 can fix the elastic tube 7 in the transmission sleeve 4 under the pressure of the spring 5, which can better apply the elastic force of the spring 5 and the elastic force of the elastic tube 7 itself to the moving ring 3; while the folded edge 12 formed by the folding back of the transmission sleeve 4 can form a limiting effect to prevent the pressure ring 8 from falling off.

[0034] Optionally, the spring 5 is configured as a conical spring 5; the spring 5 includes a large end and a small end;

[0035] The large end of the spring 5 abuts against the pressure ring 8, and the small end abuts against the spring cover 6.

[0036] With the above technical solution, the spring 5 has a conical structure. Under the same compression stroke and load-bearing capacity, the conical spring 5 occupies less axial space than the cylindrical helical spring 5, which can effectively save installation space, thereby reducing the volume of the centrifugal pump and making it easier to use and install.

[0037] Optionally, the elastic tube 7 is fitted with the spring cover 6 for limiting; the elastic tube 7 is configured in a trumpet shape; an annular protrusion 13 is provided on the outer peripheral surface of the end of the elastic tube 7 that fits with the spring cover 6; the cross section of the spring cover 6 is configured in a stepped shape to fit with the annular protrusion 13 for limiting.

[0038] With the above technical solution, the trumpet-shaped design of the elastic tube 7 allows for elastic deformation under external force. The length of the elastic tube 7 is relatively shorter than that of the corrugated tube, and the annular protrusion 13 can be limited by the spring cover 6 connected to the centrifugal pump to achieve the elastic effect.

[0039] Optionally, the edge of the elastic tube 7 away from the spring cover 6 is folded back to form a folded-back ring 14; the cross-section of the pressure ring 8 is set in an L shape; the pressure ring 8 abuts against the side of the folded-back ring 14; a protruding ring 15 is provided on the other side of the folded-back ring 14 away from the pressure ring 8; a clearance notch 16 is provided on the outer circumferential surface of the end of the moving ring 3 to cooperate with the protruding ring 15.

[0040] With the above technical solution, the folding ring 14 makes the elastic tube 7 funnel-shaped and easy to cooperate with the pressure ring 8. The notch 16 on the moving ring 3 can limit the movement with the protruding ring 15 and prevent the moving ring 3 from loosening when it abuts the protruding ring 15.

[0041] The beneficial effects of this application are as follows: Compared with the prior art, the wear-resistant sealing structure for centrifugal pumps provided by this application has the beneficial effects of wear resistance, convenient installation, reduced installation space, and uniform wear of the sealing surface.

[0042] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of this application as described above, which are not provided in detail for the sake of brevity.

[0043] This application is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A wear-resistant sealing structure for a centrifugal pump, comprising a rotating assembly, a stationary assembly, and a spring assembly, characterized in that: The rotating assembly includes a rotating ring (3) and a transmission sleeve (4); the stationary assembly includes a stationary ring (2) and a stationary ring sleeve (1); the spring assembly includes an elastic tube (7) and a spring (5); one end of the elastic tube (7) is located inside the transmission sleeve (4) and abuts against the rotating ring (3), pushing the rotating ring (3) to abut against the stationary ring (2); one end of the spring (5) is located inside the transmission sleeve (4) and abuts against the elastic tube (7), pushing the rotating ring (3) to abut against the stationary ring (2).

2. The wear-resistant sealing structure for a centrifugal pump according to claim 1, characterized in that: The moving ring (3) and the stationary ring (2) are made of graphite. The moving ring (3) has an annular limiting notch (9) that cooperates with the transmission sleeve (4). The transmission sleeve (4) has a bent edge (10) that cooperates with the limiting notch (9).

3. The wear-resistant sealing structure for a centrifugal pump according to claim 2, characterized in that: The end of the moving ring (3) forms a protruding end (11); the protruding end (11) abuts against the end face of the stationary ring (2); the limiting notch (9) is located on the outer circumferential surface of the protruding end (11).

4. The wear-resistant sealing structure for a centrifugal pump according to claim 1 or 3, characterized in that: The transmission sleeve (4) is provided with a pressure ring (8); the pressure ring (8) abuts against the elastic tube (7); one end of the spring (5) abuts against the pressure ring (8); the edge of the transmission sleeve (4) is folded back to form a folded edge (12) to limit the pressure ring (8).

5. The wear-resistant sealing structure for a centrifugal pump according to claim 4, characterized in that: The spring (5) is configured as a conical spring (5); the spring (5) includes a large end and a small end; the large end of the spring (5) abuts against the pressure ring (8), and the small end abuts against the spring cover (6).

6. The wear-resistant sealing structure for a centrifugal pump according to claim 5, characterized in that: The elastic tube (7) is matched with the spring cover (6) for positioning; the elastic tube (7) is configured as a trumpet shape; an annular protrusion (13) is provided on the outer circumferential surface of the end of the elastic tube (7) that matches the spring cover (6); the cross section of the spring cover (6) is configured as a stepped shape and matches the annular protrusion (13) for positioning.

7. The wear-resistant sealing structure for a centrifugal pump according to claim 6, characterized in that: The elastic tube (7) is folded back at the edge away from the spring cover (6) to form a folded-back ring (14); the pressure ring (8) has an L-shaped cross section; the pressure ring (8) abuts against the side of the folded-back ring (14); a protruding ring (15) is provided on the other side of the folded-back ring (14) away from the pressure ring (8); a clearance notch (16) is provided on the outer circumferential surface of the end of the moving ring (3) to cooperate with the protruding ring (15).

Images