Radial double-end-face mechanical seal for rotor pump

Abstract

The utility model provides a radial double-end-face mechanical seal for a rotor pump, which comprises a moving ring and a static ring assembly which are sleeved outside a rotating shaft and are in axial sealing fit, and a transmission groove is arranged on the back of the moving ring; the static ring assembly comprises a static ring seat, a mounting groove is formed in the end, close to the movable ring, of the static ring seat in an inwards-concave mode, a main static ring and an auxiliary static ring are assembled in the mounting groove in a sliding and sealing mode in the axial direction, and the auxiliary static ring is located on the radial outer side of the main static ring. The ends, away from the mounting groove, of the main static ring and the auxiliary static ring are matched with the front face of the movable ring in a relative rotation mode so as to form a main seal and a secondary seal which are distributed inside and outside in the radial direction. Elastic compensation elements are arranged between the ends, away from the movable ring, of the main static ring and the auxiliary static ring and the bottom of the mounting groove. The radial double-end-face mechanical seal for the rotor pump is simple in structure, double in sealing, stable in sealing performance, stable in transmission and long in service life.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical seal technical field, specifically, a kind of radial double end face mechanical seal for rotor pump. BACKGROUND

[0002] Cam rotor pump is one of advanced fluid equipment, rotor wear resistance is strong, rotor and shell high-precision gap cooperation, with very strong self-suction and high lift force, the pump reliable, strong, energy-saving, can transport various viscous or containing particulate medium;No need to flow, pump, can be applied to various complex fluid medium, dry installation, online maintenance and low-cost maintenance, stable operation, wear resistance and not easy to block up.Cam rotor pump is widely used in crude oil, thick oil, heavy oil, fuel oil, polymer, suspended solids, latex and steam-water solid mixture and other media.

[0003] For the pump shaft sealing of rotor pump, the traditional sealing structure has packing seal, ordinary single end face mechanical seal.Ordinary packing seal, due to the characteristics of high viscosity medium, after shutdown, there is often excessive torque problem, leading to packing seal rapid wear, large leakage rate.Ordinary single end face mechanical seal, after shutdown, high viscosity medium is easy to adhere to the sealing surface, frequent start-up process, the large torque of starting instant can cause mechanical seal transmission structure to be unstable, aggravate the wear of dynamic and static ring sealing surface, leading to mechanical seal not to reach service life. UTILITY MODEL CONTENTS

[0004] In order to overcome at least one defect in the above prior art, the utility model provides a kind of radial double end face mechanical seal for rotor pump, simple structure, double sealing and stable sealing performance, transmission is stable, long service life.

[0005] The utility model provides a kind of radial double end face mechanical seal for rotor pump: including the dynamic ring and static ring assembly of being sealed in the axial cooperation of being packed in the outside of rotating shaft, the back surface of the dynamic ring is equipped with transmission groove;The static ring seat is equipped with installation groove in the end recess of being close to dynamic ring, the main static ring and vice static ring are slidably and sealed in the installation groove along the axial, and the vice static ring is located in the radial outer side of the main static ring, the end of the main static ring, vice static ring is away from the installation groove respectively with the front surface of the dynamic ring rotatable cooperation, to form the main seal and secondary seal along radial inner and outer distribution respectively;Elastic compensation element is equipped between the end of the main static ring, vice static ring away from the dynamic ring and the bottom of the installation groove.

[0006] Compared with prior art, the radial double end face mechanical seal for rotor pump of the utility model has the following advantages:

[0007] The utility model discloses a rotor pump is with radial double end face mechanical seal structure in the limited axial space is provided with two sealing devices, namely along the radial distribution's main seal and secondary seal, double end face structure under the first main seal failure, secondary seal can play the temporary sealing effect, improve the sealing security and the service life, and radial setting two seals and traditional axial double end face sealing structure greatly reduces on the axial dimension, thereby for the other components installation of pump body leaves more space, in the limited space, ensure that mechanical seal runs smoothly, reliable, in addition, through the groove of dynamic ring back part transmission cooperation, under the big torque, transmission is reliable, avoids the risk of similar pin transmission, pin fracture.

[0008] As improved, the main static ring is slidably fitted in the inner hole of the static ring seat away from the end of the dynamic ring, and a first sealing ring is arranged between the outer sidewall of the main static ring and the inner hole wall of the static ring seat; a second sealing ring is arranged between the outer sidewall of the secondary static ring and the inner sidewall of the mounting groove.

[0009] Further improved, an annular boss is formed on the outer peripheral wall of the main static ring, the outer convex of the inner sidewall of the secondary static ring is formed with a plurality of first limiting blocks distributed in the circumferential direction, and the radially inner end of each first limiting block is limited to abut against the end of the annular boss away from the mounting groove; an inner peripheral wall of the opening end of the mounting groove is provided with a limiting snap spring for axially limiting the secondary static ring.

[0010] Further improved, the outer peripheral wall of the annular boss is formed with a plurality of second limiting blocks distributed in the circumferential direction and corresponding to each first limiting block, and each first limiting block is respectively abutted and limited on one side of each second limiting block away from the mounting groove.

[0011] Further improved, an inner recessed first positioning groove is arranged on the outer wall of at least one second limiting block, a second positioning groove is arranged on the inner wall of the secondary static ring at a position corresponding to the first positioning groove, and a positioning pin extending in the axial direction is connected to the bottom surface of the mounting groove, and the positioning pin is simultaneously fitted in the first positioning groove and the second positioning groove.

[0012] Further, the elastic compensation element includes a first wave spring and a second wave spring distributed in the radial direction, the first wave spring is located between the bottom of the mounting groove and the annular boss, and the second wave spring is located between the bottom of the mounting groove and the tail end of the secondary static ring. In the above improved structure, the independent wave spring as an elastic compensation element realizes the axial compensation of the main static ring and the secondary static ring, effectively saves the axial space, and ensures the stable and reliable operation of the mechanical seal in the limited space.

[0013] Further improved, the primary seal and secondary seal form a sealing cavity, and the outer peripheral wall of the static ring seat is provided with a liquid inlet channel and a liquid outlet channel which communicate with the sealing cavity. In the improved structure, the liquid inlet channel and the liquid outlet channel are provided so that the flushing liquid can circulate in the sealing cavity, which can accelerate heat dissipation of the sealing surface and timely remove medium particles to avoid wear of the sealing surface.

[0014] Further improved, the dynamic ring is provided with a plurality of circular-arc grooves which are distributed in the circumferential direction on the end face close to the static ring assembly. In the improved structure, the sealing end face of the dynamic ring is provided with the grooves, which ensures that the flushing liquid can fully penetrate into the sealing surface, ensures that the sealing surface cannot be sucked, increases the reliability of the liquid film of the sealing surface, and prolongs the service life of the mechanical seal.

[0015] Preferably, the primary static ring and the dynamic ring are made of hard alloy, and the secondary static ring is made of silicon carbide. The primary sealing dynamic ring is made of hard alloy, the combination of hard alloy and hard alloy, and the unique polishing process of the sealing surface ensures that the sealing surface cannot be sucked, has a high base strength compared with silicon carbide, and ensures that the sealing surface cannot be damaged under a large torque; the secondary sealing dynamic ring is made of silicon carbide and is used for the same hard alloy dynamic ring, which saves the cost and improves the PV value of the secondary sealing.

[0016] The above-mentioned multiple improved advantages of the utility model will be specifically described in the following specific embodiments, and part of them will become apparent from the description or be understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained through the structures specially pointed out in the description and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a half-section view of the radial double-end-face mechanical seal for the rotor pump of the utility model;

[0018] Figure 2 It is another angle sectional view of the radial double-end-face mechanical seal for the rotor pump of the utility model;

[0019] Figure 3 It is a structure view of the primary static ring in the utility model;

[0020] Figure 4 It is a structure view of the secondary static ring in the utility model;

[0021] Figure 5 It is another angle schematic view of the secondary static ring in the utility model;

[0022] Figure 6 It is a structure view of the dynamic ring in the utility model;

[0023] Figure 7 It is another angle structure view of the dynamic ring in the utility model;

[0024] Figure 8 Another angle sectional view of the radial double end face mechanical seal for the rotor pump of the utility model.

[0025] Mark explanation:

[0026] 1, dynamic ring; 2, transmission groove; 3, static ring seat; 4, installation groove; 5, main static ring; 6, secondary static ring; 7, first sealing ring; 8, second sealing ring; 9, annular boss; 10, first limit block; 11, limit clasp; 12, second limit block; 13, first positioning groove; 14, second positioning groove; 15, positioning pin; 16, first wave spring; 17, second wave spring; 18, sealing cavity; 19, liquid inlet passage; 20, liquid outlet passage; 21, circular-arc-shaped groove. Specific embodiments

[0027] First, those skilled in the art should understand that these embodiments are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can adjust them as needed in order to adapt to specific application occasions.

[0028] In the description of the embodiments of the present application, it should be pointed out that, unless otherwise explicitly specified and limited, the terms "fixed", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0029] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0030] Reference Figures 1-8As shown, the embodiment of the present application discloses a radial double end face mechanical seal for a rotor pump, which comprises a dynamic ring 1 and a static ring assembly sleeved on the outside of a pump shaft, wherein a transmission groove 2 is directly formed on the back of the dynamic ring 1, which is used for realizing rotational cooperation with the pump shaft, and under the driving action of the pump shaft, the dynamic ring 1 rotates synchronously with the pump shaft; the other end of the dynamic ring 1 is attached to the static ring assembly to form a sealing surface; specifically, the static ring assembly comprises a static ring seat 3, the static ring seat 3 is fixedly matched with a pump cavity, an installation groove 4 is formed in the inner recess of one end of the static ring seat 3 close to the dynamic ring 1, a main static ring 5 and a secondary static ring 6 are slidably and sealingly matched in the installation groove 4 along the axial direction, and the secondary static ring 6 is located on the radial outer side of the main static ring 5, the one end of the main static ring 5 and the secondary static ring 6 away from the installation groove 4 is respectively rotatably matched with the front surface of the dynamic ring 1 to respectively form a main seal and a secondary seal distributed along the radial inner and outer sides; an elastic compensation element is arranged between the one end of the main static ring 5 and the secondary static ring 6 away from the dynamic ring 1 and the groove bottom, and in this structure, the elastic compensation element is used to drive the main static ring 5 and the secondary static ring 6 to always have a tendency to move towards the side of the dynamic ring 1, so as to ensure the stability of the main seal and the secondary seal.

[0031] In the above structure, referring to the accompanying drawings Figure 8 A sealing cavity 18 is formed between the main seal and the secondary seal, and a liquid inlet channel 19 and a liquid outlet channel 20 are formed on the outer peripheral wall of the static ring seat 3 and are communicated with the sealing cavity 18. After the liquid inlet channel 19 and the liquid outlet channel 20 are arranged, the flushing liquid can be circulated into the sealing cavity 18, which can not only accelerate the heat dissipation of the sealing surface, but also can timely carry the medium particles to avoid the wear of the sealing surface.

[0032] Specifically, referring to the accompanying drawings Figure 1 The one end of the main static ring 5 away from the dynamic ring 1 is slidably matched in the inner hole of the static ring seat 3, and a first annular groove is formed on the inner hole wall of the static ring seat 3, and a first sealing ring 7 is matched in the first annular groove, the inner end of the first sealing ring 7 is sleeved on the outside of the one end of the main static ring 5 away from the dynamic ring 1 to realize sealing cooperation; in addition, a second annular groove is formed on the inner side wall of the installation groove 4, a second sealing ring 8 is matched in the second annular groove, and the inner ring of the second sealing ring 8 is sleeved and matched on the outside of the secondary static ring 6 to realize sealing cooperation. In other embodiments, the position of the first annular groove can also be formed on the main static ring 5; the position of the second annular groove can also be formed on the secondary static ring 6, as long as the axial positioning of the corresponding sealing ring can be realized.

[0033] In addition, in the embodiment, referring to the accompanying drawings Figure 1 , 2And 3, the outer peripheral wall of the main static ring 5 is formed with an annular boss 9, the inner side wall of the secondary static ring 6 is formed with a plurality of first limiting blocks 10 distributed in the circumferential direction, and the radially inner end of each first limiting block 10 is limited to abut against one end of the annular boss 9 away from the mounting groove 4; the inner peripheral wall of the opening end of the mounting groove 4 is provided with a limiting snap spring 11 for axially limiting the secondary static ring 6, realizing the pre-assembly of the main static ring 5, the secondary static ring 6 and the static ring seat 3 as an integrated structure, facilitating subsequent installation into the pump cavity, and avoiding missing parts during installation. In this structure, more specifically, a positioning step is provided on the outer wall of the secondary static ring 6 near one end of the dynamic ring 1, a third annular groove is formed on the inner wall of the opening end of the mounting groove 4, the limiting snap spring 11 is fitted in the third annular groove, and the radially inner end of the limiting snap spring 11 abuts against the end face of the positioning step in the axial direction, realizing the axial limitation of the secondary static ring 6.

[0034] Preferably, referring to the accompanying drawings Figure 2 And 3 A plurality of second limiting blocks 12 corresponding to each first limiting block 10 are formed on the outer peripheral wall of the annular boss 9, each first limiting block 10 is abutted and limited on one side of each second limiting block 12 away from the mounting groove 4. Furthermore, the outer wall of at least one second limiting block 12 is provided with a first positioning groove 13 concave, a second positioning groove 14 is formed on the inner wall of the secondary static ring 6 corresponding to the first positioning groove 13, and a positioning pin 15 extending in the axial direction is connected to the bottom surface of the mounting groove 4, and the positioning pin 15 is fitted in the first positioning groove 13 and the second positioning groove 14 at the same time. In this embodiment, the positioning pin 15 is a cylindrical pin, the first positioning groove 13 and the second positioning groove 14 are both semicircular structures, and when the main static ring 5 and the secondary static ring 6 are fitted and positioned, the two semicircular structures just fit into a circular positioning hole, one end of the positioning pin 15 is positioned in the circular positioning hole, that is, the simultaneous anti-rotation positioning of the main static ring 5 and the secondary static ring 6 can be realized by one pin shaft; and in this structure, the positioning pin 15 can slide in the circular positioning hole in the axial direction, so as to ensure that the main static ring 5 and the secondary static ring 6 can axially float, and ensure stable sealing performance.

[0035] In another aspect, referring to the accompanying drawings Figure 2 In this embodiment, the elastic compensation element includes a first wave spring 16 and a second wave spring 17 distributed in the radial direction, the first wave spring 16 is located between the bottom of the mounting groove 4 and the annular boss 9, and the second wave spring 17 is located between the bottom of the mounting groove 4 and the tail end of the secondary static ring 6. The independent wave spring as an elastic compensation element realizes the axial compensation of the main static ring 5 and the secondary static ring 6, effectively saves the axial space, and ensures the smooth and reliable operation of the mechanical seal in the limited space.

[0036] In addition, referring to the accompanying drawings Figure 6In the embodiment, the end face of the movable ring 1 close to the static ring assembly is provided with a plurality of circular arc grooves 21 distributed circumferentially. Preferably, there are four circular arc grooves 21, and the centers of the four circular arc grooves 21 coincide with the center of the movable ring 1. The sealing end face of the movable ring 1 is provided with grooves, which ensures that the flushing liquid can fully penetrate the sealing surface, ensures that it will not be sucked, at the same time, increases the liquid film reliability of the sealing surface, and prolongs the service life of the mechanical seal.

[0037] In the embodiment, the main static ring 5 and the movable ring 1 are made of hard alloy material, and the auxiliary static ring 6 is made of silicon carbide material. The main movable ring 1 and the main static ring 5 are made of hard alloy, and the combination of hard alloy and hard alloy pairing, the unique polishing process of the sealing surface, ensures that the sealing surface will not be sucked, at the same time, has higher matrix strength than silicon carbide, ensures that the sealing surface will not be damaged under large torque; the secondary seal adopts a silicon carbide static ring to the same hard alloy movable ring 1, saves the cost, at the same time, also improves the PV value of the secondary seal.

[0038] In the description of the present application, the description of the terms "the embodiment", "some embodiments" and the like means that the specific features, mechanisms, materials or characteristics described in combination with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, the different embodiments or examples described in the specification and the features of the different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0039] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A radial double-end mechanical seal for a rotor pump, characterized in that: The assembly includes a rotating ring (1) and a stationary ring assembly that are fitted around the outside of a rotating shaft and are axially sealed. The rotating ring (1) has a transmission groove (2) on its back side. The stationary ring assembly includes a stationary ring seat (3). The stationary ring seat (3) has a recessed mounting groove (4) at one end near the rotating ring (1). The mounting groove (4) contains a main stationary ring (5) and a secondary stationary ring (6) that are axially slidable and sealed. The secondary stationary ring (6) is located radially outside the main stationary ring (5). The ends of the main stationary ring (5) and the secondary stationary ring (6) away from the mounting groove (4) are respectively rotatably fitted with the front side of the rotating ring (1) to form a main seal and a secondary seal that are radially distributed inward and outward, respectively. An elastic compensation element is provided between the ends of the main stationary ring (5) and the secondary stationary ring (6) away from the rotating ring (1) and the bottom of the mounting groove (4).

2. The radial double-end mechanical seal for a rotor pump according to claim 1, characterized in that: The end of the main stationary ring (5) away from the moving ring (1) is slidably fitted in the inner hole of the stationary ring seat (3), and a first sealing ring (7) is provided between the outer wall of the main stationary ring (5) and the inner wall of the stationary ring seat (3); a second sealing ring (8) is provided between the outer wall of the auxiliary stationary ring (6) and the inner wall of the mounting groove (4).

3. The radial double-end mechanical seal for a rotor pump according to claim 1, characterized in that: The outer peripheral wall of the main stationary ring (5) is formed with an annular boss (9), and the inner side wall of the secondary stationary ring (6) is formed with a plurality of first limiting blocks (10) distributed circumferentially, and the radial inner end of each first limiting block (10) is limited and abutted against the end of the annular boss (9) away from the mounting groove (4); the inner peripheral wall of the opening end of the mounting groove (4) is provided with a limiting snap ring (11) for axially limiting the secondary stationary ring (6).

4. The radial double-end mechanical seal for a rotor pump according to claim 3, characterized in that: The outer peripheral wall of the annular boss (9) is formed with a plurality of second limiting blocks (12) distributed circumferentially and corresponding one-to-one with each of the first limiting blocks (10). Each of the first limiting blocks (10) abuts and limits each of the second limiting blocks (12) on the side away from the mounting groove (4).

5. The radial double-end mechanical seal for a rotor pump according to claim 4, characterized in that: At least one of the second limiting blocks (12) has a recessed first positioning groove (13) on its outer wall, and a second positioning groove (14) is opened on the inner wall of the auxiliary stationary ring (6) at a position corresponding to the first positioning groove (13). A positioning pin (15) extending axially is connected to the bottom surface of the mounting groove (4), and the positioning pin (15) is simultaneously engaged in the first positioning groove (13) and the second positioning groove (14).

6. The radial double-end mechanical seal for a rotor pump according to claim 3, 4, or 5, characterized in that: The elastic compensation element includes a first wave spring (16) and a second wave spring (17) distributed radially inward and outward. The first wave spring (16) is located between the bottom of the mounting groove (4) and the annular boss (9), and the second wave spring (17) is located between the bottom of the mounting groove (4) and the tail end of the auxiliary stationary ring (6).

7. The radial double-end mechanical seal for a rotor pump according to claim 6, characterized in that: A sealing cavity (18) is formed between the main seal and the secondary seal. An inlet channel (19) and an outlet channel (20) communicating with the sealing cavity (18) are provided on the outer peripheral wall of the stationary ring seat (3).

8. The radial double-end mechanical seal for a rotor pump according to claim 7, characterized in that: The moving ring (1) has multiple circumferentially distributed arc-shaped grooves (21) on its end face near the stationary ring assembly.

9. The radial double-end mechanical seal for a rotor pump according to claim 1, characterized in that: The main stationary ring (5) and the moving ring (1) are both made of hard alloy, and the secondary stationary ring (6) is made of silicon carbide.

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