Mechanical seal structure for a fluid delivery device

Abstract

The utility model discloses a mechanical seal structure for fluid conveying equipment, include: shaft sleeve, spring seat, moving ring, static ring, gland, locating plate and locking mechanism, wherein, the inner perimeter of shaft sleeve installs first sealing washer, spring seat is fixed in the lower part of shaft sleeve and installs spring in the upper part, moving ring is sealed with the shaft sleeve and is in abutment with spring, static ring sealed installation is in the inside of gland and is sealed with moving ring piece contact through the limitation of locating plate, static ring with the gland all are with the clearance fit of shaft sleeve, the lower part of gland still is provided with the cavity that can communicate with outside, the bottom of gland is installed with third sealing washer, locking mechanism cooperation installation is in the outer periphery of the upper part of shaft sleeve, is used for fastening shaft sleeve and rotor. This mechanical seal structure, reasonable in structure, convenient to assemble, it is convenient for replacing failure parts, and good sealing, can cool in time to the friction position.

Description

Technical Field

[0001] This utility model relates to the field of mechanical seal technology, and in particular provides a mechanical seal structure for fluid conveying equipment. Background Technology

[0002] In the field of mechanical engineering, mechanical seals, as sealing devices between rotating shafts and equipment, directly affect the operating efficiency and reliability of the equipment. Existing mechanical seal structures are complex, with components that are difficult to replace. During long-term operation, friction between the rotating and stationary rings generates heat, which can affect the lifespan of components and sealing performance. Therefore, proposing a mechanical seal structure that is structurally sound, easy to assemble, and offers excellent sealing performance has become an urgent problem to be solved. Utility Model Content

[0003] Therefore, the purpose of this utility model is to provide a mechanical seal structure for fluid conveying equipment to solve the problems existing in the prior art.

[0004] The technical solution provided by this utility model is: a mechanical seal structure for fluid conveying equipment, comprising: a bushing, a spring seat, a rotating ring, a stationary ring, a gland, a positioning plate, and a locking mechanism. The bushing has a first sealing ring installed on its inner circumference to cooperate with a rotor. The upper part of the bushing includes multiple spaced arc-shaped plates along its circumference. The spring seat includes a seat body and a side plate. The seat body is fitted onto the lower part of the bushing and positioned with the bushing via a set screw. The side plate is connected to the upper part of the seat body and forms an annular cavity with the bushing. The upper part of the seat body has multiple axial spring holes spaced along its circumference, each spring hole corresponding to a spring. The rotating ring includes a rotating ring seat and rotating ring plates. The rotating ring seat is slidably installed in the annular cavity along the axial direction of the bushing, and its inner circumference is connected to the bushing via a second sealing ring. The sealing rings are sealed together. The bottom of the moving ring seat abuts against the spring. The inner side of the top of the moving ring seat is provided with a moving ring plate mounting groove. The moving ring plate is interference-fitted into the moving ring plate mounting groove and has a clearance fit with the bushing. The stationary ring is sealed in the stationary ring mounting cavity of the pressure cover and is sealed to the moving ring plate by the positioning plate fixed above the pressure cover. Both the stationary ring and the pressure cover have a clearance fit with the bushing. The lower part of the stationary ring mounting cavity of the pressure cover is also provided with a cavity. The cavity communicates with the outside through a through hole provided on the pressure cover. A third sealing ring is installed at the bottom of the pressure cover. The third sealing ring is located outside the cavity. The locking mechanism is fitted and installed on the outer periphery of the upper part of the bushing to press the arc-shaped plate inward, thereby achieving the fastening of the arc-shaped plate to the rotor.

[0005] Preferably, the lower end of the bushing is provided with a limiting outer edge, and when the bottom of the spring seat abuts against the limiting outer edge, the set screw corresponds to the corresponding hole on the bushing.

[0006] Further preferably, the inner circumference of the bushing is provided with an installation groove that mates with the first sealing ring.

[0007] In a further preferred embodiment, the outer periphery of the bushing is provided with a positioning plate limiting groove, one end of the positioning plate is inserted into the positioning plate limiting groove, and the other end of the positioning plate is fixedly connected to the pressure cap.

[0008] Further preferably, the inner circumference of the moving ring seat is provided with a mounting groove that mates with the second sealing ring.

[0009] Further preferably, the outer periphery of the moving ring seat is provided with a plurality of axial grooves at intervals, and the inner side of the side plate is provided with protrusions that correspond one-to-one with the axial grooves.

[0010] Further preferably, the side plate is provided with multiple through holes.

[0011] In a further preferred embodiment, a positioning hole is provided on the top of the stationary ring, and a positioning pin corresponding to the positioning hole is provided on the pressure cap.

[0012] Further preferably, the outer periphery of the stationary ring is provided with at least one step, and a fourth sealing ring is provided between the step and the corresponding surface of the gland.

[0013] Further preferably, the locking mechanism includes a first transmission ring and a second transmission ring, wherein the first transmission ring is a complete ring with a ramp on its inner side, the second transmission ring has an opening along its circumference, the second transmission ring is bolted to the top of the first transmission ring and has a slope at its lower part that cooperates with the ramp, and by pressing down on the second transmission ring, the slope of the second transmission ring presses the bushing inward under the restriction of the ramp.

[0014] The mechanical seal structure for fluid conveying equipment provided by this utility model has a reasonable structure, is easy to assemble, and facilitates the replacement of failed parts. The structure can ensure effective sealing between the rotating ring and the stationary ring by setting a spring. The rotating ring plate, the stationary ring and the gland are all clearance-fitted with the bushing, which can reduce friction. Each sealing ring and the friction surface between the rotating ring and the stationary ring can achieve effective sealing. The cavity can be circulated with cooling fluid through the through hole on the gland to avoid overheating at the friction position. Attached Figure Description

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments: Figure 1 A schematic diagram of the mechanical seal structure for fluid transport equipment provided by this utility model; Figure 2 A cross-sectional view of the mechanical seal structure for a fluid transport device provided by this utility model; Figure 3 A cross-sectional view of the mechanical seal structure for fluid transport equipment provided by this utility model; Figure 4 This is a sectional view of the bushing; Figure 5 This is a schematic diagram of the structure of the moving ring seat; Figure 6 This is a schematic diagram of the gland structure. Detailed Implementation

[0016] The present invention will be further explained below with reference to specific implementation schemes, but it is not limited to the present invention.

[0017] like Figures 1 to 6 As shown, this utility model provides a mechanical seal structure for a fluid conveying device, including: a bushing 1, a spring seat 2, a rotating ring 3, a stationary ring 4, a gland 5, a positioning plate 6, and a locking mechanism 7. The bushing 1 has a first sealing ring 11 installed on its inner circumference to cooperate with a rotor 10. The upper part of the bushing 1 includes multiple spaced arc-shaped pieces 12 along its circumferential direction. The spring seat 2 includes a seat body 21 and a side plate 22. The seat body 21 is fitted onto the lower part of the bushing 1 and positioned and connected to the bushing 1 by a set screw. The side plate 22 is connected to the upper part of the seat body 21 and forms an annular cavity with the bushing 1. The upper part of the seat body 21 has multiple axial spring holes spaced along its circumference, and springs 23 are installed in each spring hole. The rotating ring 3 includes a rotating ring seat 31 and a rotating ring piece 32. The rotating ring seat 31 is slidably installed in the annular cavity along the axial direction of the bushing 1, and its inner circumference is connected to the bushing 1 by a second sealing ring 32. 3. Sealing fit: The bottom of the moving ring seat 31 abuts against the spring 23. The inner side of the top of the moving ring seat 31 is provided with a moving ring plate mounting groove. The moving ring plate 32 is interference-fitted in the moving ring plate mounting groove and clearance-fitted with the bushing 1. The stationary ring 4 is sealed in the stationary ring mounting cavity 51 of the pressure cover 5 and is sealed to the moving ring plate 32 by the positioning plate 6 fixed above the pressure cover 5. The stationary ring 4 and the pressure cover 5 are clearance-fitted with the bushing 1. The lower part of the stationary ring mounting cavity 51 of the pressure cover 5 is also provided with a cavity 52. ​​The cavity 52 is connected to the outside through the through hole 53 provided on the pressure cover 5. The bottom end of the pressure cover 5 is provided with a third sealing ring 54. The third sealing ring 54 is located outside the cavity 52. ​​The locking mechanism 7 is fitted on the outer periphery of the upper part of the bushing 1 and is used to press the arc-shaped plate 13 inward, thereby realizing the fastening of the arc-shaped plate 13 and the rotor 10.

[0018] This mechanical seal structure for fluid transport equipment has a reasonable structure and is easy to assemble. It can cool the friction components in time and ensure sealing performance. The specific assembly method is as follows: install and fix the spring seat on the outside of the bushing; install the rotating ring; mate the stationary ring and the gland and press it on the rotating ring with the positioning plate; put the bushing on the rotor and lock it with the locking mechanism; in actual working conditions, cooling fluid can be introduced into the cavity through the through hole on the gland, thereby achieving cooling of the friction surface.

[0019] As an improvement to the technical solution, the lower end of the bushing 1 is provided with a limiting outer edge 13. When the bottom of the spring seat 2 abuts against the limiting outer edge 13, the set screw corresponds to the corresponding hole on the bushing 1.

[0020] As an improvement to the technical solution, the inner circumference of the bushing 1 is provided with an installation groove that mates with the first sealing ring 11.

[0021] As an improvement to the technical solution, a positioning plate limiting groove 14 is provided on the outer periphery of the bushing 1. One end of the positioning plate 6 is inserted into the positioning plate limiting groove 14, and the other end of the positioning plate 6 is fixedly connected to the pressure cover 5. The positioning plate can realize the function of pressing and assembling, and is also used to limit the contact between the pressure cover and the bushing.

[0022] As an improvement to the technical solution, the inner circumference of the moving ring seat 31 is provided with an installation groove that mates with the second sealing ring 33.

[0023] As an improvement to the technical solution, the outer periphery of the moving ring seat 31 is provided with a plurality of axial grooves 311 at intervals, and the inner side of the side plate 22 is provided with protrusions 221 that correspond one-to-one with the axial grooves 311. The grooves and protrusions cooperate to control the moving ring seat to only move axially.

[0024] As an improvement to the technical solution, the side plate 22 is provided with multiple through holes (not shown in the figure), through which fluid can enter the annular cavity and further push the moving ring to press against the stationary ring.

[0025] As an improvement to the technical solution, a positioning hole is provided on the top of the stationary ring 4, and a positioning pin 55 corresponding to the positioning hole is provided on the pressure cover 5. This pin is used to restrict the rotation of the stationary ring and guide the axial movement of the stationary ring. It is also used to restrict the contact between the stationary ring and the bushing.

[0026] As an improvement to the technical solution, at least one step is provided on the outer periphery of the stationary ring 4, and a fourth sealing ring 8 is provided between the step and the corresponding surface of the pressure cap 5. This sealing ring can achieve the effect of better sealing performance with higher pressure.

[0027] As an improvement to the technical solution, the locking mechanism 7 includes a first transmission ring 71 and a second transmission ring 72. The first transmission ring 71 is a complete ring with a ramp on its inner side. The second transmission ring 72 has an opening along its circumference. The second transmission ring 72 is bolted to the top of the first transmission ring 71 and has a slope at its lower part that cooperates with the ramp. By pressing down on the second transmission ring 72, the slope of the second transmission ring 72 presses the bushing 1 inward under the restriction of the ramp.

[0028] The specific embodiments of this utility model are written in a progressive manner, emphasizing the differences between each implementation scheme, and the similar parts can be referred to each other.

[0029] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A mechanical seal structure for fluid conveying equipment, characterized in that, include: The bushing (1), spring seat (2), moving ring (3), stationary ring (4), pressure cap (5), positioning plate (6), and locking mechanism (7) are provided. The inner circumference of the bushing (1) is equipped with a first sealing ring (11) that cooperates with the rotor (10). The upper part of the bushing (1) includes multiple spaced arc-shaped pieces (12) along the circumferential direction. The spring seat (2) includes a seat body (21) and a side plate (22). The seat body (21) is fitted onto the lower part of the bushing (1) and is positioned and connected to the bushing (1) by a set screw. The side plate (22) is connected to the upper part of the seat (21) and forms an annular cavity with the bushing (1). The upper part of the seat (21) is provided with a plurality of axial spring holes spaced apart along its circumference. A spring (23) is installed in each spring hole. The moving ring (3) includes a moving ring seat (31) and a moving ring plate (32). The moving ring seat (31) is slidably installed in the annular cavity along the axial direction of the bushing (1) and its inner circumference is sealed with the bushing (1) by a second sealing ring (33). The bottom of the ring abuts against the spring (23). The inner side of the top of the moving ring seat (31) is provided with a moving ring plate mounting groove. The moving ring plate (32) is interference-fitted into the moving ring plate mounting groove and clearance-fitted with the bushing (1). The stationary ring (4) is sealed in the stationary ring mounting cavity (51) of the pressure cover (5) and is sealed to the moving ring plate (32) by the restriction of the positioning plate (6) fixed above the pressure cover (5). The stationary ring (4) and the pressure cover (5) are both clearance-fitted with the bushing (1). The lower part of the stationary ring mounting cavity (51) of the pressure cover (5) is also provided with a cavity (52). The cavity (52) is connected to the outside through the through hole (53) provided on the pressure cover (5). A third sealing ring (54) is installed at the bottom of the pressure cover (5). The third sealing ring (54) is located outside the cavity (52). The locking mechanism (7) is installed on the outer periphery of the upper part of the bushing (1) to press the arc-shaped piece (12) inward, thereby realizing the fastening of the arc-shaped piece (12) and the rotor (10).

2. The mechanical seal structure for fluid conveying equipment according to claim 1, characterized in that: The lower end of the bushing (1) is provided with a limiting outer edge (13). When the bottom of the spring seat (2) abuts against the limiting outer edge (13), the set screw corresponds to the corresponding hole on the bushing (1).

3. The mechanical seal structure for fluid conveying equipment according to claim 1, characterized in that: The inner circumference of the bushing (1) is provided with an installation groove that mates with the first sealing ring (11).

4. The mechanical seal structure for fluid conveying equipment according to claim 1, characterized in that: The bushing (1) is provided with a positioning plate limiting groove (14) on its outer periphery. One end of the positioning plate (6) is inserted into the positioning plate limiting groove (14), and the other end of the positioning plate (6) is fixedly connected to the pressure cap (5).

5. The mechanical seal structure for fluid transport equipment according to claim 1, characterized in that: The inner circumference of the moving ring seat (31) is provided with an installation groove that mates with the second sealing ring (33).

6. The mechanical seal structure for fluid transport equipment according to claim 1, characterized in that: The outer periphery of the moving ring seat (31) is provided with a plurality of axial grooves (311) spaced apart, and the inner side of the side plate (22) is provided with protrusions (221) that correspond one-to-one with the axial grooves (311).

7. The mechanical seal structure for fluid transport equipment according to claim 1, characterized in that: The side plate (22) is provided with multiple through holes.

8. The mechanical seal structure for fluid transport equipment according to claim 1, characterized in that: A positioning hole is provided on the top of the stationary ring (4), and a positioning pin (55) corresponding to the positioning hole is provided on the pressure cap (5).

9. The mechanical seal structure for fluid transport equipment according to claim 1, characterized in that: The outer periphery of the stationary ring (4) is provided with at least one step, and a fourth sealing ring (8) is provided between the step and the corresponding surface of the cover (5).

10. The mechanical seal structure for a fluid transport device according to claim 1, characterized in that: The locking mechanism (7) includes a first transmission ring (71) and a second transmission ring (72). The first transmission ring (71) is a complete ring with a ramp on its inner side. The second transmission ring (72) has an opening along its circumference. The second transmission ring (72) is bolted to the top of the first transmission ring (71) and has a slope at its lower part that cooperates with the ramp. By pressing down on the second transmission ring (72), the slope of the second transmission ring (72) presses the bushing (1) inward under the restriction of the ramp.

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