Leakage detection device for shaft seal and shaft seal device thereof

Abstract

The utility model relates to the technical field of sealing leakage detection, especially to a kind of leakage detection device of shaft seal and its shaft seal device, and leakage detection device includes: air pipe, air pump, gas storage tank, pressure sensor, pressure regulating valve, one end of air pipe is connected with shaft seal device, one end of air pump is connected with the other end of air pipe, the other end of air pump is connected with gas storage tank, pressure sensor, pressure regulating valve are connected with air pipe, and pressure sensor is located between shaft seal device and pressure regulating valve, and pressure sensor is used to monitor the pressure in shaft seal device in real time. The utility model can monitor the pressure in shaft seal device in real time by pressure sensor, to feed back the leakage condition of shaft seal, and inject gas into shaft seal device after leakage occurs, and timely adjust the pressure in sealing cavity, to maintain the sealing of reaction kettle temporarily until production is completed.

Description

Technical Field

[0001] This utility model relates to the field of sealing leakage detection technology, and in particular to a leakage detection device for shaft seals and the shaft seal device thereof. Background Technology

[0002] High-speed dispersers can be used for mixing and dispersing various powders and liquids. When used for mixing and dispersing slightly toxic and volatile powders and liquids, the sealing performance of the equipment is particularly important, especially the requirements for shaft seals. Commonly used rotary shaft seals include oil seals, mechanical seals, and packing seals. Due to various factors, seal failure during equipment use is often impossible to monitor in real time, posing a significant challenge to the replacement cycle and maintenance of seals. During the dispersion and mixing process, seal failure can affect some mixing and dispersion steps, reduce the quality of the final product, and even cause the mixture to evaporate and leak, polluting the environment. Utility Model Content

[0003] To address the shortcomings of the existing production technology, the applicant provides a leakage detection device for shaft seals and a shaft seal device thereof. By improving the leakage detection structure of the shaft seal, real-time detection of the shaft seal is achieved, thereby providing feedback on the leakage status of the shaft seal. After leakage occurs, the pressure inside the sealing cavity is adjusted in a timely manner to temporarily maintain the sealing of the reactor until production is completed.

[0004] The technical solution adopted in this utility model is as follows:

[0005] A leakage detection device for a shaft seal is installed outside a dispersion bearing cavity and connected to the shaft seal device. The leakage detection device includes: an air pipe, an air pump, an air storage tank, a pressure sensor, and a pressure regulating valve. One end of the air pipe is connected to the shaft seal device, one end of the air pump is connected to the other end of the air pipe, and the other end of the air pump is connected to the air storage tank. The pressure sensor and the pressure regulating valve are both connected to the air pipe, and the pressure sensor is located between the shaft seal device and the pressure regulating valve. The pressure sensor is used to monitor the pressure inside the shaft seal device in real time, and the pressure regulating valve is used to adjust the pressure of the shaft seal device to a preset value A. Specifically, when the pressure sensor detects that the pressure value B inside the shaft seal device is less than the preset value A, a leak occurs in the shaft seal device. The air pump is then activated to inject gas stored in the air storage tank into the shaft seal device, and the pressure inside the shaft seal device is adjusted to the preset value A via the pressure regulating valve.

[0006] Therefore, the pressure sensor can monitor the pressure inside the shaft seal device in real time, thereby providing feedback on the leakage of the shaft seal. If a leakage occurs, gas can be injected into the shaft seal device to adjust the pressure inside the sealing cavity in a timely manner, so as to temporarily maintain the sealing of the reactor until production is completed, so as to avoid the current production operation being affected by the leakage of the shaft seal, thereby improving the efficiency of production operation.

[0007] As a further improvement to the above technical solution, it also includes: a T-type connector, the T-type connector having three ports, the first port of the T-type connector being connected to the shaft sealing device, the second port of the T-type connector being connected to one end of the air pump, and the third port of the T-type connector being connected to the pressure sensor.

[0008] As a further improvement to the above technical solution: the air pipe includes a first branch pipe and a second branch pipe, the first port of the T-shaped connector is connected to the shaft sealing device through the first branch pipe, and the second port of the T-shaped connector is connected to one end of the air pump through the second branch pipe.

[0009] As a further improvement to the above technical solution, it also includes: an air source dual unit, which is installed on the second branch pipe and located between the air pump and the pressure regulating valve. Thus, the air source dual unit ensures a stable and clean air source for the shaft sealing device.

[0010] A shaft sealing device is installed between a dispersion bearing cavity and a dispersion main shaft, and is located on the side near the vessel cover. The shaft sealing device includes: a wear-resistant sleeve, an oil seal mounting seat, a sealing cavity, and a leakage detection device for the shaft seal. The wear-resistant sleeve is fitted onto the outer circumferential surface of the dispersion main shaft, and the oil seal mounting seat is fitted onto the outer circumferential surface of the wear-resistant sleeve. A sealing cavity is formed between the wear-resistant sleeve and the oil seal mounting seat, and one end of a gas pipe is connected to the sealing cavity.

[0011] As a further improvement to the above technical solution: the wear-resistant sleeve is coated with an alumina titanium coating on the side near the sealing cavity. Therefore, the alumina titanium coating increases the wear resistance of the wear-resistant sleeve, thereby significantly improving the sealing performance of the entire shaft sealing device.

[0012] As a further improvement to the above technical solution: a first O-ring is embedded on the side of the wear-resistant sleeve near the dispersing spindle. There are two first O-rings, which are located at the upper and lower ends of the wear-resistant sleeve, respectively.

[0013] As a further improvement to the above technical solution: the oil seal mounting base has a mounting groove on the side near the wear-resistant sleeve. There are two mounting grooves in total, which are located at the upper and lower ends of the oil seal mounting base, respectively. An elastic retaining ring is embedded in the mounting groove.

[0014] As a further improvement to the above technical solution, it also includes a double-lip oil seal and a single-lip oil seal. Both the double-lip and single-lip oil seals are located within the sealing cavity. The double-lip oil seal is located at the upper end of the oil seal mounting base, and the single-lip oil seal is located at the lower end of the oil seal mounting base. Both the double-lip and single-lip oil seals are fixed to the oil seal mounting base by the elastic retaining ring. Thus, both the double-lip and single-lip oil seals serve a sealing function. The double-lip oil seal is designed to achieve a better sealing effect (because a bearing is installed between the dispersion bearing cavity and the dispersion main shaft, and this bearing is located on the side of the shaft sealing device away from the reactor), preventing bearing lubricating oil from leaking into the sealing cavity. The single-lip oil seal is designed to save costs.

[0015] As a further improvement to the above technical solution, it also includes: a hexagonal double external thread connector, a smooth tube double internal thread connector, and a lock nut straight-through. The hexagonal double external thread connector passes through the oil seal mounting base, the smooth tube double internal thread connector passes through the dispersion bearing cavity, and the lock nut straight-through is located outside the dispersion bearing cavity. The hexagonal double external thread connector, the smooth tube double internal thread connector, and the lock nut straight-through are sequentially connected, and the end of the hexagonal double external thread connector away from the smooth tube double internal thread connector is connected to the sealing cavity. The end of the lock nut straight-through away from the smooth tube double internal thread connector is connected to the first port of the T-type connector through a first branch pipe.

[0016] The beneficial effects of this utility model are as follows:

[0017] The pressure sensor can monitor the pressure inside the shaft seal in real time, thereby providing feedback on the leakage of the shaft seal. If a leakage occurs, gas can be injected into the shaft seal to adjust the pressure inside the sealing cavity in a timely manner, so as to temporarily maintain the sealing of the reactor until production is completed. This avoids the impact of shaft seal leakage on the current production operation, thereby improving production efficiency.

[0018] This utility model also has the following advantages:

[0019] 1. This utility model uses a dual air source assembly to ensure that the shaft sealing device obtains a stable and clean air source.

[0020] 2. This utility model can increase the wear resistance of the wear-resistant sleeve through the alumina titanium coating, thereby greatly improving the sealing performance of the entire shaft sealing device. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the leakage detection device for the shaft seal in Embodiment 1;

[0022] Figure 2 This is a schematic diagram of the shaft sealing device, the shaft sealing device, the dispersion bearing cavity, and the dispersion main shaft installation in Embodiment 2.

[0023] Figure 3 Example 2 Figure 2 Enlarged schematic diagram of a local structure at point A;

[0024] Figure 4 Example 2 Figure 2 Enlarged schematic diagram of the local structure at point B.

[0025] Among them: 1. Dispersion bearing cavity;

[0026] 101. First mounting flange;

[0027] 2. Shaft sealing device;

[0028] 201. Wear-resistant sleeve; 2011. Alumina titanium coating; 2012. First O-ring seal; 202. Oil seal mounting base; 2021. Mounting groove; 2022. Elastic retaining ring; 2023. Third O-ring seal; 203. Sealing cavity; 204. Double-lip oil seal; 205. Single-lip oil seal; 206. Hexagonal double male threaded connector; 207. Plain tube double female threaded connector; 208. Lock nut straight-through;

[0029] 3. Trachea;

[0030] 301. First branch pipe; 302. Second branch pipe;

[0031] 4. Air pump;

[0032] 5. Gas storage tank;

[0033] 6. Pressure sensor;

[0034] 7. Pressure regulating valve;

[0035] 8. T-type connector;

[0036] 9. Gas source dual unit;

[0037] 10. Dispersion main axis;

[0038] 11. Cauldron cover;

[0039] 12. Second mounting flange;

[0040] 13. Second O-ring seal;

[0041] 14. Reactor;

[0042] 15. Bearings. Detailed Implementation

[0043] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0044] Example 1:

[0045] like Figure 1 As shown, a leakage detection device for a shaft seal is installed outside the bearing cavity 1 and connected to the shaft seal device 2. The leakage detection device includes: an air pipe 3, an air pump 4, an air tank 5, a pressure sensor 6, and a pressure regulating valve 7. One end of the air pipe 3 is connected to the shaft seal device 2, one end of the air pump 4 is connected to the other end of the air pipe 3, and the other end of the air pump 4 is connected to the air tank 5. The pressure sensor 6 and the pressure regulating valve 7 are both connected to the air pipe 3, and the pressure sensor 6 is located between the shaft seal device 2 and the pressure regulating valve 7. The pressure sensor 6 is used to monitor the pressure inside the shaft seal device 2 in real time, and the pressure regulating valve 7 is used to adjust the pressure inside the shaft seal device 2 to a preset value A. Specifically, when the pressure sensor 6 detects that the pressure value B inside the shaft seal device 2 is less than the preset value A, the shaft seal device 2 leaks, so the air pump 4 is started to inject the gas stored in the air tank 5 into the shaft seal device 2, and the pressure inside the shaft seal device 2 is adjusted to the preset value A through the pressure regulating valve 7. Therefore, the pressure sensor 6 can monitor the pressure inside the shaft seal device 2 in real time, thereby providing feedback on the leakage of the shaft seal. After leakage occurs, gas is injected into the shaft seal device 2 to adjust the pressure inside the sealing cavity 203 in a timely manner (i.e., the pressure inside the shaft seal device 2 is adjusted to the preset value A through the pressure regulating valve 7) to temporarily maintain the sealing of the reactor 14 until production is completed, so as to avoid the current production operation being affected by the leakage of the shaft seal, thereby improving the efficiency of production operation.

[0046] In other words, by monitoring the pressure inside the shaft seal device 2 in real time through the pressure sensor 6, the leakage of the shaft seal can be fed back, enabling rapid response and maintenance and replacement.

[0047] For example, the gas stored in gas tank 5 is compressed air.

[0048] In this embodiment, it also includes: a T-connector 8, which has three ports. The first port of the T-connector 8 is connected to the shaft sealing device 2, the second port of the T-connector 8 is connected to one end of the air pump 4, and the third port of the T-connector 8 is connected to the pressure sensor 6.

[0049] In this embodiment, the air pipe 3 includes a first branch pipe 301 and a second branch pipe 302. The first port of the T-connector 8 is connected to the shaft sealing device 2 through the first branch pipe 301, and the second port of the T-connector 8 is connected to one end of the air pump 4 through the second branch pipe 302.

[0050] In this embodiment, an air source dual unit 9 is also included. The air source dual unit 9 is installed on the second branch pipe 302 and is located between the air pump 4 and the pressure regulating valve 7. Thus, the air source dual unit 9 ensures that the shaft sealing device 2 obtains a stable and clean air source.

[0051] Example 2:

[0052] like Figures 2 to 4 As shown, a shaft sealing device 2 is installed between the dispersion bearing cavity 1 and the dispersion main shaft 10, and is located on the side near the reactor cover 11. The shaft sealing device 2 includes: a wear-resistant sleeve 201, an oil seal mounting seat 202, a sealing cavity 203, and a leakage detection device for the shaft seal. The wear-resistant sleeve 201 is fitted on the outer circumferential surface of the dispersion main shaft 10, and the oil seal mounting seat 202 is fitted on the outer circumferential surface of the wear-resistant sleeve 201. A sealing cavity 203 is formed between the wear-resistant sleeve 201 and the oil seal mounting seat 202. One end of the gas pipe 3 is connected to the sealing cavity 203. Thus, the pressure sensor 6 can monitor the pressure inside the shaft sealing device 2 in real time, thereby providing feedback on the leakage of the shaft seal. After a leakage occurs, gas is injected into the shaft sealing device 2 to adjust the pressure inside the sealing cavity 203 in a timely manner, so as to temporarily maintain the sealing of the reactor 14 until the production is completed, so as to avoid the current production operation being affected by the leakage of the shaft seal, thereby improving the production efficiency.

[0053] Specifically, the wear-resistant sleeve 201 is connected to the dispersion spindle 10 by bolts.

[0054] In this embodiment, the wear-resistant sleeve 201 is coated with an alumina titanium coating 2011 on the side near the sealing cavity 203; two first O-rings 2012 are embedded on the side of the wear-resistant sleeve 201 near the dispersing spindle 10, with the two first O-rings 2012 located at the upper and lower ends of the wear-resistant sleeve 201 respectively; two mounting grooves 2021 are provided on the side of the oil seal mounting seat 202 near the wear-resistant sleeve 201, with the two mounting grooves 2021 located at the upper and lower ends of the oil seal mounting seat 202 respectively, and elastic retaining rings 2022 are embedded in the mounting grooves 2021. Thus, the alumina titanium coating 2011 increases the wear resistance of the wear-resistant sleeve 201, thereby significantly improving the sealing performance of the entire shaft sealing device 2.

[0055] Specifically, the thickness of the alumina titanium coating 2011 is 1-2 micrometers.

[0056] In this embodiment, a double-lip oil seal 204 and a single-lip oil seal 205 are also included. Both the double-lip oil seal 204 and the single-lip oil seal 205 are located within the sealing cavity 203. The double-lip oil seal 204 is located at the upper end of the oil seal mounting base 202, and the single-lip oil seal 205 is located at the lower end of the oil seal mounting base 202. Both the double-lip oil seal 204 and the single-lip oil seal 205 are fixed to the oil seal mounting base 202 by elastic retaining rings 2022. Thus, both the double-lip oil seal 204 and the single-lip oil seal 205 serve a sealing function. The double-lip oil seal 204 is provided to achieve a better sealing effect (since a bearing 15 is installed between the dispersion bearing cavity 1 and the dispersion main shaft 10, and this bearing 15 is located on the side of this shaft sealing device away from the reactor 14), to prevent the lubricating oil of the bearing 15 from leaking into the sealing cavity 203. The single-lip oil seal 205 is provided to save costs.

[0057] In this embodiment, it also includes: a hexagonal double external thread connector 206, a smooth tube double internal thread connector 207, and a lock nut straight connector 208. The hexagonal double external thread connector 206 passes through the oil seal mounting base 202, the smooth tube double internal thread connector 207 passes through the dispersion bearing cavity 1, and the lock nut straight connector 208 is located outside the dispersion bearing cavity 1. The hexagonal double external thread connector 206, the smooth tube double internal thread connector 207, and the lock nut straight connector 208 are connected in sequence. The end of the hexagonal double external thread connector 206 away from the smooth tube double internal thread connector 207 is connected to the sealing cavity 203, and the end of the lock nut straight connector 208 away from the smooth tube double internal thread connector 207 is connected to the first port of the T-type connector 8 through the first branch pipe 301.

[0058] It should be noted that:

[0059] 1. A first mounting flange 101 is provided on the side of the dispersion bearing cavity 1 near the vessel cover 11, and a second mounting flange 12 is provided on the side of the vessel cover 11 near the dispersion bearing cavity 1. The connection between the dispersion bearing cavity 1 and the vessel cover 11 is achieved through the mutual cooperation between the first mounting flange 101 and the second mounting flange 12. A second O-ring 13 is embedded on the side of the first mounting flange 101 near the second mounting flange 12.

[0060] 2. The oil seal mounting base 202 is bolted to the first mounting flange 101, and a third O-ring 2023 is embedded on the side of the oil seal mounting base 202 near the first mounting flange 101.

[0061] 3. A motor (e.g., a variable frequency motor, not shown in the figure) is installed on the side of the dispersion bearing cavity 1 away from the vessel cover 11. The drive end of the motor is connected to the dispersion main shaft 10 through a coupling (not shown in the figure). A bearing 15 is also connected between the dispersion bearing cavity 1 and the dispersion main shaft 10. The bearing 15 is located on the side of the shaft sealing device away from the reactor 14. In this way, when the motor is started, the dispersion main shaft 10 is rotated by the motor (the dispersion bearing cavity 1, the shaft sealing leakage detection device, the shaft sealing device and the reactor 14 will not rotate), so as to achieve the mixing and dispersion of various materials in the reactor 14.

[0062] Fourth, the first O-ring 2012, the second O-ring 13 and the third O-ring 2023 are used to form a completely sealed space in the reactor 14, which is used for the mixing and dispersion of various materials.

[0063] The process of mixing and dispersing materials in the reactor 14 in this embodiment is as follows: First, various types of materials to be mixed and dispersed are injected into the reactor 14. Then, the motor is started, along with the air pump 4, air source dual unit 9, pressure regulating valve 7, and pressure sensor 6. The air pump 4 injects the gas stored in the gas storage tank 5 (initial pressure of the gas is 0.1 MPa, flow rate is 20 L / min) into the sealed cavity 203. The pressure regulating valve 7 adjusts the gas pressure in the sealed cavity 203 to a preset value A (generally 0.05 MPa), and maintains the pressure in the sealed cavity 203 at this preset value A. The motor drives the rotation of the dispersion shaft 10 to mix and disperse the various types of materials in the reactor 14. The pressure sensor 6 monitors the pressure in the sealed cavity 203 in real time. If the pressure sensor 6 detects in real time that the pressure value B in the shaft sealing device 2 is less than the preset value A, it indicates that the sealing cavity 203 is leaking. At this time, in order to ensure the sealing performance of the entire equipment, the pressure in the sealing cavity 203 is adjusted by the cooperation of the air pump 4, the air source dual unit 9 and the pressure regulating valve 7, so that the pressure in the sealing cavity 203 is maintained at the preset value A (i.e., 0.05Mpa). The volatile gas is temporarily sealed in the reactor 14 by positive pressure gas seal until the production of this batch of products is completed. After the production of this batch of products is completed, the mixed and dispersed mixture is discharged. At the same time, the sealing cavity 203 leakage alarm is issued to remind the maintenance personnel to perform maintenance and replacement (after the production of this batch of products is completed).

[0064] In summary, this utility model can monitor the pressure inside the shaft sealing device 2 in real time through the pressure sensor 6, thereby providing feedback on the leakage of the shaft seal. After leakage occurs, gas is injected into the shaft sealing device 2 to adjust the pressure inside the sealing cavity 203 in a timely manner, so as to temporarily maintain the sealing of the reactor 14 until production is completed, so as to avoid the current production operation being affected by the leakage of the shaft seal, thereby improving the efficiency of production operation.

[0065] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.

Claims

1. A leakage detection device for a shaft seal, the leakage detection device being installed outside a dispersion bearing cavity (1) and connected to a shaft seal device (2), characterized in that, The leakage detection device includes: Air pipe (3), one end of which is connected to the shaft sealing device (2); An air pump (4) and an air storage tank (5), one end of the air pump (4) is connected to the other end of the air pipe (3), and the other end of the air pump (4) is connected to the air storage tank (5); Pressure sensor (6) and pressure regulating valve (7) are both connected to the air pipe (3), and the pressure sensor (6) is located between the shaft sealing device (2) and the pressure regulating valve (7). The pressure sensor (6) is used to monitor the pressure in the shaft sealing device (2) in real time, and the pressure regulating valve (7) is used to adjust the pressure of the shaft sealing device (2) to a preset value A. Wherein: when the pressure sensor (6) detects in real time that the pressure value B in the shaft sealing device (2) is less than the preset value A, the shaft sealing device (2) leaks, so as to start the air pump (4) to inject the gas stored in the air tank (5) into the shaft sealing device (2), and adjust the pressure in the shaft sealing device (2) to the preset value A through the pressure regulating valve (7).

2. The leakage detection device for shaft seals as described in claim 1, characterized in that: Also includes: The T-connector (8) has three ports. The first port of the T-connector (8) is connected to the shaft sealing device (2), the second port of the T-connector (8) is connected to one end of the air pump (4), and the third port of the T-connector (8) is connected to the pressure sensor (6).

3. The leakage detection device for shaft seals as described in claim 2, characterized in that: The trachea (3) includes: The first branch pipe (301) and the second branch pipe (302) are connected, with the first port of the T-joint (8) connected to the shaft sealing device (2) through the first branch pipe (301) and the second port of the T-joint (8) connected to one end of the air pump (4) through the second branch pipe (302).

4. The leakage detection device for shaft seals as described in claim 3, characterized in that: Also includes: A dual air supply unit (9) is installed on the second branch pipe (302) and is located between the air pump (4) and the pressure regulating valve (7).

5. A shaft sealing device, wherein the shaft sealing device (2) is installed between the dispersion bearing cavity (1) and the dispersion main shaft (10), and is located on the side near the vessel cover (11), characterized in that: The shaft sealing device (2) includes: Wear-resistant sleeve (201), the wear-resistant sleeve (201) is sleeved on the outer circumferential surface of the dispersion main shaft (10); An oil seal mounting base (202) is sleeved on the outer circumferential surface of the wear-resistant sleeve (201); A sealing cavity (203) is formed between the wear-resistant sleeve (201) and the oil seal mounting base (202); The leakage detection device for shaft seals as described in any one of claims 1-4, wherein one end of the air pipe (3) is connected to the sealing cavity (203).

6. The shaft sealing device as described in claim 5, characterized in that: The wear-resistant sleeve (201) is coated with an alumina titanium coating (2011) on the side near the sealing cavity (203).

7. The shaft sealing device as described in claim 5, characterized in that: The wear-resistant sleeve (201) is fitted with a first O-ring (2012) on the side near the dispersing spindle (10). There are two first O-rings (2012), which are located at the upper and lower ends of the wear-resistant sleeve (201).

8. The shaft sealing device as described in claim 5, characterized in that: The oil seal mounting base (202) has a mounting groove (2021) on the side near the wear-resistant sleeve (201). There are two mounting grooves (2021), which are located at the upper and lower ends of the oil seal mounting base (202) respectively. An elastic retaining ring (2022) is embedded in the mounting groove (2021).

9. The shaft sealing device as described in claim 8, characterized in that: Also includes: A double-lip oil seal (204) and a single-lip oil seal (205) are provided. Both the double-lip oil seal (204) and the single-lip oil seal (205) are located in the sealing cavity (203). The double-lip oil seal (204) is located at the upper end of the oil seal mounting base (202), and the single-lip oil seal (205) is located at the lower end of the oil seal mounting base (202). Both the double-lip oil seal (204) and the single-lip oil seal (205) are fixed on the oil seal mounting base (202) by the elastic retaining ring (2022).

10. The shaft sealing device as described in claim 5, characterized in that: Also includes: The device comprises a hexagonal double external thread connector (206), a smooth double internal thread connector (207), and a lock nut straight connector (208). The hexagonal double external thread connector (206) penetrates the oil seal mounting base (202), the smooth double internal thread connector (207) penetrates the dispersion bearing cavity (1), and the lock nut straight connector (208) is located outside the dispersion bearing cavity (1). The hexagonal double external thread connector (206), the smooth double internal thread connector (207), and the lock nut straight connector (208) are connected in sequence. The end of the hexagonal double external thread connector (206) away from the smooth double internal thread connector (207) is connected to the sealing cavity (203), and the end of the lock nut straight connector (208) away from the smooth double internal thread connector (207) is connected to the first port of the T-type connector (8) through a first branch pipe (301).

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