Adjustable mechanical sealing structure

Abstract

The invention relates to the field of mechanical sealing, in particular to an adjustable mechanical sealing structure. The adjustable mechanical sealing structure comprises a static sealing mechanism, a connecting sleeve is connected in the static sealing mechanism, the connecting sleeve is fixedly connected with a shaft body of a rotor pump, and a plurality of sealing rings are arranged on the inner ring surface of the connecting sleeve; the sealing gasket is fixedly connected with the connecting sleeve and is connected with the shaft body; the dynamic sealing mechanism is connected with the sealing gasket; and the adjusting mechanism is connected with the dynamic sealing mechanism. The dynamic sealing pair and the static sealing pair are always kept in an effective working state through the pre-tightening force of the first pre-tightening spring, material leakage is avoided, meanwhile, the first pre-tightening spring is externally arranged, the situation that the first pre-tightening spring loses efficacy due to material hardening, and then mechanical sealing leakage is caused is avoided, static sealing is cooled through the static ring base, and the service life is prolonged. The movable sealing pair dissipates heat through the movable ring seat and guides the heat to the heat dissipation ring through the heat conduction rod, and therefore heat dissipation is conducted through the heat dissipation ring at the same time, and overheating of the static sealing pair and the movable sealing pair is avoided.

Description

Technical Field

[0001] This invention relates to the field of mechanical seals, and more particularly to adjustable mechanical seal structures. Background Technology

[0002] In existing technologies, rotary pumps can transport a wide variety of materials. In the lithium battery industry, the materials transported by rotary pumps have complex compositions, placing even more stringent demands on the mechanical seals. However, the rotating components of existing mechanical seal structures are typically immersed in the material during operation, and the heat dissipation of the sealing pair mainly depends on the material being transported. Due to the tendency of lithium battery materials to adhere and solidify, after prolonged contact with the material, the preload spring is prone to material caking and accumulation on its surface. This causes the spring to gradually lose its elasticity, making it unable to continuously provide stable end-face clamping force. This further leads to poor sealing of the sealing pair, resulting in seal failure and media leakage. Summary of the Invention

[0003] To overcome the drawbacks of preload springs, which are prone to material caking and accumulation on their surface after prolonged contact with materials, leading to a gradual loss of spring elasticity and an inability to continuously provide stable end-face clamping force, further causing poor sealing of the sealing pair, resulting in sealing failure and media leakage, this invention provides an adjustable mechanical seal structure.

[0004] The technical implementation of the present invention is as follows: an adjustable mechanical seal structure, comprising: a static sealing mechanism, wherein a connecting sleeve is connected thereto, the connecting sleeve being fixedly connected to the shaft of a rotor pump, and a plurality of sealing rings are provided on the inner annular surface of the connecting sleeve; a sealing gasket, fixedly connected to the connecting sleeve and connected to the shaft; a dynamic sealing mechanism, connected to the sealing gasket; and an adjusting mechanism, connected to the dynamic sealing mechanism.

[0005] Optionally, the sealing gasket includes a soft PTFE gasket.

[0006] Optionally, the static sealing mechanism includes a static ring seat rotatably connected to the connecting sleeve and a static sealing pair fixedly connected to the static ring seat.

[0007] Optionally, the dynamic sealing mechanism includes a dynamic ring seat fixedly connected to the sealing gasket and a dynamic sealing pair fixedly connected to the dynamic ring seat, wherein the dynamic ring seat is slidably connected to the shaft, and the dynamic sealing pair cooperates with the static sealing pair.

[0008] Optionally, it also includes a plurality of insert rods that are fixed to the moving ring seat and slidably connected to the connecting sleeve.

[0009] Optionally, the adjustment mechanism includes a plurality of ring array limit rods slidably connected to the moving ring seat, a plurality of ring array first preload springs fixedly connected to the moving ring seat, a spring fixing seat fixedly connected to the plurality of first preload springs, a fixing ring fixedly connected to the shaft body, and an adjustment nut screwed to the fixing ring.

[0010] Optionally, it also includes a liquid phase sealing mechanism, which includes a plurality of filling units, each filling unit corresponding to one of the limiting rods. The filling unit includes an injection cylinder fixedly connected to the moving ring seat, a piston rod slidably connected to the injection cylinder, and a second preload spring fixedly connected to the piston rod. The second preload spring is fixedly connected to one of the limiting rods.

[0011] Optionally, the filling unit further includes a connecting pipe communicating with the injection cylinder and a replenishment pipe communicating with the connecting pipe, wherein a control valve is provided on the replenishment pipe.

[0012] Optionally, it further includes a gas collecting ring connected to the connecting pipes of several filling units, a gas supply pipe connected to the gas collecting ring, and a pressure sensor connected to the gas collecting ring; wherein, a control valve is provided on the gas supply pipe, and a sealing piston is slidably connected in each connecting pipe; an annular groove is provided on the opposing sides of the dynamic sealing pair and the static sealing pair, and an annular sealing groove is formed between the dynamic sealing pair and the static sealing pair; a plurality of liquid guiding holes are provided on the dynamic sealing pair and communicate with the annular sealing groove, and each liquid guiding hole communicates with the liquid outlet of one of the injection cylinders.

[0013] Optionally, it also includes a heat dissipation ring fixedly connected to the moving ring seat, wherein a plurality of heat-conducting rods are fixedly connected between the heat dissipation ring and the dynamic sealing pair, and the plurality of heat-conducting rods are all fixedly connected to the moving ring seat.

[0014] The present invention has the following advantages: 1. The preload of the first preload spring keeps the dynamic sealing pair and the static sealing pair in an effective working state at all times, avoiding material leakage. At the same time, by placing the first preload spring externally, the material caking is prevented from causing the first preload spring to fail, which in turn leads to mechanical seal leakage. The static seal dissipates heat through the static ring seat, and the dynamic sealing pair dissipates heat through the dynamic ring seat. At the same time, the heat is also directed to the heat dissipation ring through the heat conduction rod. Thus, heat dissipation is carried out through the heat dissipation ring at the same time, improving the heat dissipation effect and preventing the static seal and the dynamic sealing pair from overheating.

[0015] 2. The sealing fluid is introduced into the annular sealing groove through the liquid guide hole, filling the annular sealing groove to form an annular liquid phase seal. It then penetrates between the static and dynamic sealing pairs to form a liquid film, which plays a lubricating role, reduces the wear of the static and dynamic sealing pairs, and extends their service life. At the same time, it prevents materials from penetrating between the static and dynamic sealing pairs, avoiding the aggravation of wear on the static and dynamic sealing pairs due to particulate matter in the materials.

[0016] 3. By connecting an external air-filling device to the air-collecting ring through the air-transmitting pipe, the pressure inside the air-collecting ring is increased, causing the sealing piston to slide towards the center of the injection cylinder. Then, under the condition that the second pre-tightening spring applies a preset thrust to the piston rod, the sealing piston applies an additional preset pressure. According to different delivery conditions, the output pressure of the sealing liquid in the injection cylinder can be further adjusted to improve flexibility and practicality. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a partial cross-sectional view of the present invention; Figure 3 This is an enlarged view of area A of the present invention; Figure 4 This is an enlarged view of region B of the present invention.

[0018] The meanings of the reference numerals in the figure are as follows: 1-shaft, 2-stationary ring seat, 3-fixed ring, 4-adjusting nut, 5-spring fixing seat, 6-dynamic ring seat, 7-connecting sleeve, 8-sealing ring, 9-sealing gasket, 10-static sealing pair, 11-dynamic sealing pair, 001-annular sealing groove, 002-liquid guide hole, 12-limiting rod, 13-first pre-tightening spring, 14-heat dissipation ring, 15-insertion rod, 16-heat conducting rod, 17-liquid injection cylinder, 18-piston rod, 19-second pre-tightening spring, 20-connecting pipe, 21-liquid replenishment pipe, 22-sealing piston, 23-gas collecting ring, 24-gas delivery pipe, 25-pressure sensor. Detailed Implementation

[0019] References to embodiments herein mean that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0020] Example This embodiment provides an adjustable mechanical seal structure, according to... Figures 1-4 As shown, it includes: A static sealing mechanism is provided, wherein a connecting sleeve 7 is connected, the connecting sleeve 7 is fixedly connected to the shaft 1 of the rotor pump, and two sealing rings 8 are provided on the inner annular surface of the connecting sleeve 7; The sealing gasket 9 is fixedly connected to the connecting sleeve 7 and to the shaft 1; A dynamic sealing mechanism is connected to the sealing gasket 9; and An adjustment mechanism is connected to the dynamic sealing mechanism.

[0021] The sealing ring 8 ensures the sealing between the connecting sleeve 7 and the shaft 1, the sealing gasket 9 ensures the sealing between the dynamic sealing mechanism and the shaft 1, the dynamic sealing mechanism and the static sealing mechanism work together to achieve the sealing effect, and the adjusting mechanism adjusts the state of the dynamic sealing mechanism to keep it in an effective working state with the dynamic sealing mechanism.

[0022] The sealing gasket 9 includes a soft PTFE gasket.

[0023] This facilitates the adjustment of the dynamic sealing mechanism by the adjustment mechanism.

[0024] The static sealing mechanism includes a static ring seat 2 rotatably connected to the connecting sleeve 7 and a static sealing pair 10 fixedly connected to the static ring seat 2.

[0025] The dynamic sealing mechanism includes a dynamic ring seat 6 fixedly connected to the sealing gasket 9 and a dynamic sealing pair 11 fixedly connected to the dynamic ring seat 6, wherein the dynamic ring seat 6 is slidably connected to the shaft 1, and the dynamic sealing pair 11 works in cooperation with the static sealing pair 10.

[0026] During operation, the shaft 1 drives the rotating ring seat 6 and the dynamic sealing pair 11 to rotate. The dynamic sealing pair 11 cooperates with the static sealing pair 10 to achieve a sealing effect.

[0027] It also includes a number of insert rods 15 that are fixed to the moving ring seat 6 and slidably connected to the connecting sleeve 7.

[0028] The connecting sleeve 7 and the moving ring seat 6 are connected by several insert rods 15 to ensure that the moving ring seat 6 and the connecting sleeve 7 rotate synchronously when the shaft 1 rotates, so as to avoid the sealing gasket 9 being damaged by torsion.

[0029] The adjustment mechanism includes a plurality of ring array limit rods 12 slidably connected to the moving ring seat 6, a plurality of ring array first preload springs 13 fixedly connected to the moving ring seat 6, a spring fixing seat 5 fixedly connected to a plurality of first preload springs 13, a fixing ring 3 fixedly connected to the shaft body 1, and an adjustment nut 4 screwed to the fixing ring 3.

[0030] By turning the adjusting nut 4, the adjusting nut 4 pushes the spring fixing seat 5 to move, so that the first preload spring 13 is compressed and thus applies a preload force to the moving ring seat 6.

[0031] It also includes a liquid phase sealing mechanism, which includes a plurality of filling units, each filling unit corresponding to one of the limiting rods 12. The filling unit includes an injection cylinder 17 fixedly connected to the moving ring seat 6, a piston rod 18 slidably connected to the injection cylinder 17, and a second preload spring 19 fixedly connected to the piston rod 18. The second preload spring 19 is fixedly connected to one of the limiting rods 12.

[0032] By squeezing the second pre-tightening spring 19 through the limiting rod 12, a preset thrust is applied to the piston rod 18. As the sealing fluid in the annular sealing groove 001 is consumed and lost, the outlet of the injection cylinder 17 always maintains the sealing fluid output pressure during the working process, thereby ensuring that the annular sealing groove 001, the static sealing pair 10 and the dynamic sealing pair 11 are always filled with sealing fluid.

[0033] The filling unit also includes a connecting pipe 20 connected to the injection cylinder 17 and a replenishment pipe 21 connected to the connecting pipe 20, and a control valve is provided on the replenishment pipe 21.

[0034] Sealing fluid is added to the injection cylinder 17 through the connecting pipe 20 and the replenishment pipe 21, and the replenishment pipe 21 is opened and closed by the control valve.

[0035] It also includes a gas collecting ring 23 connected to the connecting pipes 20 of several filling units, a gas supply pipe 24 connected to the gas collecting ring 23, and a pressure sensor 25 connected to the gas collecting ring 23; The gas supply pipe 24 is equipped with a control valve, and a sealing piston 22 is slidably connected inside each of the connecting pipes 20. Both the dynamic sealing pair 11 and the static sealing pair 10 are provided with an annular groove on their opposing sides, and an annular sealing groove 001 is formed between the dynamic sealing pair 11 and the static sealing pair 10. The dynamic sealing pair 11 is provided with a plurality of liquid guiding holes 002 that communicate with the annular sealing groove 001, and each of the liquid guiding holes 002 is connected to the liquid outlet of one of the liquid injection cylinders 17.

[0036] Before operation, the control valve on the gas supply pipe 24 is opened. Gas can also be supplied to the gas collecting ring 23 through an external gas supply device connected to the gas supply pipe 24, increasing the pressure inside the gas collecting ring 23. This causes the sealing piston 22 to slide towards the center of the injection cylinder 17. Then, with the second pre-tightening spring 19 applying a preset thrust to the piston rod 18, an additional preset pressure is applied through the sealing piston 22. The output pressure of the sealing liquid in the injection cylinder 17 is further adjusted according to different delivery conditions. During operation, the pressure inside the gas collecting ring 23 is monitored by the pressure sensor 25.

[0037] It also includes a heat dissipation ring 14 fixedly connected to the moving ring seat 6. The heat dissipation ring 14 and the dynamic sealing pair 11 are jointly fixedly connected to a plurality of heat-conducting rods 16. The plurality of heat-conducting rods 16 are all fixedly connected to the moving ring seat 6. The heat dissipation ring 14 is made of aluminum, and the heat-conducting rods 16 are made of copper.

[0038] During operation, the static seal dissipates heat through the static ring seat 2, and the dynamic seal pair 11 dissipates heat through the dynamic ring seat 6. At the same time, the heat is also directed to the heat dissipation ring 14 through the heat conduction rod 16. Thus, heat is dissipated through the heat dissipation ring 14 at the same time, improving the heat dissipation effect and preventing the static seal and dynamic seal pair 11 from overheating.

[0039] During installation, the stationary ring seat 2 is fixedly connected to the rotor pump housing. Before operation, the control valve on the limit rod 12 is opened, and a preset amount of sealing fluid is injected into the injection cylinder 17 through the replenishment pipe 21. The sealing fluid is then introduced into the annular sealing groove 001 through the guide hole 002, filling the annular sealing groove 001 to form an annular liquid phase seal. This seal penetrates between the stationary sealing pair 10 and the dynamic sealing pair 11 to form a liquid film, which acts as a lubricant, reducing wear on the stationary sealing pair 10 and the dynamic sealing pair 11, and extending their service life. At the same time, it prevents material from penetrating between the stationary sealing pair 10 and the dynamic sealing pair 11, avoiding the damage caused by particulate matter in the material. As wear on sealing pair 11 intensifies, the control valve on the limit rod 12 is closed, and the adjusting nut 4 is turned to push the spring fixing seat 5 to move, causing the limit rod 12 to slide within the moving ring seat 6. This compresses the first preload spring 13, thereby applying a preset pressure to the moving ring seat 6 to squeeze the sealing gasket 9. During the wear process of static sealing pair 10 and dynamic sealing pair 11, the preload force of the first preload spring 13 ensures that the dynamic sealing pair 11 and static sealing pair 10 always maintain an effective working state, preventing material leakage. At the same time, by placing the first preload spring 13 externally, material caking is prevented from causing the first preload spring 13 to fail, which would lead to mechanical seal leakage.

[0040] While the limiting rod 12 slides within the moving ring seat 6, it simultaneously compresses the second pre-tightening spring 19, causing the second pre-tightening spring 19 to apply a preset thrust to the piston rod 18. During operation, as the sealing fluid in the annular sealing groove 001 is consumed and lost, the outlet of the injection cylinder 17 maintains a constant sealing fluid output pressure, thereby ensuring that the annular sealing groove 001, the static sealing pair 10, and the dynamic sealing pair 11 are always filled with sealing fluid. This guarantees the sealing effect of the sealing fluid in the annular sealing groove 001, prevents material from seeping between the static sealing pair 10 and the dynamic sealing pair 11, and achieves automatic replenishment of the sealing fluid between the static sealing pair 10 and the dynamic sealing pair 11. This ensures the continuous lubrication effect of the sealing fluid between the static sealing pair 10 and the dynamic sealing pair 11, thereby further improving the service life of the static sealing pair 10 and the dynamic sealing pair 11.

[0041] Based on the actual delivery situation of the rotor pump, before operation, the control valve on the air supply pipe 24 can be opened, and air can also be supplied to the air collecting ring 23 through the external air supply pipe 24 to increase the pressure inside the air collecting ring 23. This causes the sealing piston 22 to slide towards the center of the injection cylinder 17. Then, under the condition that the second pre-tightening spring 19 applies a preset thrust to the piston rod 18, the sealing piston 22 applies an additional preset pressure. According to different delivery conditions, the output pressure of the sealing liquid in the injection cylinder 17 can be further adjusted to improve flexibility and practicality.

[0042] During operation, the fixed ring 3, adjusting nut 4, spring fixing seat 5, moving ring seat 6, connecting sleeve 7, sealing ring 8, sealing gasket 9, and dynamic sealing pair 11 rotate synchronously with the shaft 1 of the rotor pump. During operation, the pressure sensor 25 monitors the pressure inside the gas collecting ring 23. Under normal operating conditions, as the sealing fluid in the annular sealing groove 001 is consumed, the sealing fluid in the injection cylinder 17 decreases at a predicted rate. The sealing piston 22 moves a predicted distance towards the center of the injection cylinder 17, thus reducing the pressure inside the gas collecting ring 23 by a predicted value. Thus, the pressure sensor 25 monitors the pressure inside the gas collecting ring 23 in real time, and the external data processing system calculates the rate of change of pressure inside the gas collecting ring 23. Based on the rate of change of pressure inside the gas collecting ring 23, the pressure of the static sealing pair 10 and the dynamic sealing pair 11 can be determined. 1. Whether it is in normal working condition: The pressure sensor 25, in conjunction with the external data processing system, enables an early warning function. In addition, this method can also be used to perform a self-check of the sealing effect before operation. By connecting an external inflation device to the air supply pipe 24, air is injected into the air collecting ring 23 to make the pressure inside the air collecting ring 23 reach the preset value. After closing the control valve on the air supply pipe 24, the static sealing pair 10 and the dynamic sealing pair 11 are in a normal working condition, and the rate of loss of sealing fluid in the annular sealing groove 001 is within the expected range, that is, the pressure reduction value inside the air collecting ring 23 is within the expected range. If, within the preset time, the pressure sensor 25 detects that the pressure reduction value inside the air collecting ring 23 exceeds the expected range, it indicates that there is a problem with the sealing state between the static sealing pair 10 and the dynamic sealing pair 11, thus realizing the self-check function and further enhancing practicality.

[0043] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An adjustable mechanical seal structure, characterized in that, include: A static sealing mechanism is provided, wherein a connecting sleeve (7) is connected, the connecting sleeve (7) is fixedly connected to the shaft (1) of the rotor pump, and a plurality of sealing rings (8) are provided on the inner annular surface of the connecting sleeve (7). The sealing gasket (9) is fixedly connected to the connecting sleeve (7) and connected to the shaft (1); A dynamic sealing mechanism is connected to the sealing gasket (9); and An adjustment mechanism is connected to the dynamic sealing mechanism.

2. The adjustable mechanical seal structure according to claim 1, characterized in that, The sealing gasket (9) includes a soft PTFE gasket.

3. The adjustable mechanical seal structure according to claim 1, characterized in that, The static sealing mechanism includes a static ring seat (2) rotatably connected to the connecting sleeve (7) and a static sealing pair (10) fixedly connected to the static ring seat (2).

4. The adjustable mechanical seal structure according to claim 1, characterized in that, The dynamic sealing mechanism includes a dynamic ring seat (6) fixedly connected to the sealing gasket (9) and a dynamic sealing pair (11) fixedly connected to the dynamic ring seat (6), wherein the dynamic ring seat (6) is slidably connected to the shaft (1), and the dynamic sealing pair (11) works in cooperation with the static sealing pair (10).

5. The adjustable mechanical seal structure according to claim 4, characterized in that, It also includes a number of insert rods (15) that are fixed to the moving ring seat (6) and slidably connected to the connecting sleeve (7).

6. The adjustable mechanical seal structure according to claim 1, characterized in that, The adjustment mechanism includes a plurality of ring array limit rods (12) slidably connected to the moving ring seat (6), a plurality of ring array first preload springs (13) fixedly connected to the moving ring seat (6), a spring fixing seat (5) fixedly connected to a plurality of first preload springs (13), a fixing ring (3) fixedly connected to the shaft (1), and an adjustment nut (4) screwed to the fixing ring (3).

7. The adjustable mechanical seal structure according to claim 6, characterized in that, It also includes a liquid phase sealing mechanism, which includes several filling units, each filling unit corresponding to one of the limiting rods (12). The filling unit includes an injection cylinder (17) fixedly connected to the moving ring seat (6), a piston rod (18) slidably connected to the injection cylinder (17), and a second preload spring (19) fixedly connected to the piston rod (18). The second preload spring (19) is fixedly connected to one of the limiting rods (12).

8. The adjustable mechanical seal structure according to claim 7, characterized in that, The filling unit also includes a connecting pipe (20) connected to the injection cylinder (17) and a replenishing pipe (21) connected to the connecting pipe (20), and a control valve is provided on the replenishing pipe (21).

9. The adjustable mechanical seal structure according to claim 7, characterized in that, It also includes a gas collecting ring (23) connected to the connecting pipe (20) of several filling units, a gas supply pipe (24) connected to the gas collecting ring (23), and a pressure sensor (25) connected to the gas collecting ring (23). The gas supply pipe (24) is equipped with a control valve, and a sealing piston (22) is slidably connected in each of the connecting pipes (20). Both the dynamic sealing pair (11) and the static sealing pair (10) are provided with an annular groove on their opposite sides, and an annular sealing groove (001) is formed between the dynamic sealing pair (11) and the static sealing pair (10). The dynamic sealing pair (11) is provided with a plurality of liquid guiding holes (002) that communicate with the annular sealing groove (001), and each of the liquid guiding holes (002) is connected to the outlet of one of the liquid injection cylinders (17).

10. The adjustable mechanical seal structure according to any one of claims 4-9, characterized in that, It also includes a heat dissipation ring (14) fixedly connected to the moving ring seat (6), and a plurality of heat-conducting rods (16) are fixedly connected between the heat dissipation ring (14) and the dynamic sealing pair (11), and the plurality of heat-conducting rods (16) are all fixedly connected to the moving ring seat (6).

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