Magnetic pump with leak detection function

Abstract

This utility model discloses a magnetic pump with leakage monitoring function, including a pump body, pump cover, pump shaft, impeller, outer magnetic sleeve assembly, inner magnetic sleeve assembly, and double-layer isolation sleeve assembly. At least one connection point—the connection between the inlet pipe end flange and the inlet pump end flange, the connection between the outlet pipe end flange and the outlet pump end flange, and the connection between the pump cover and the pump body—employs a double-seal structure. This utility model's double-seal structure, through the buffering effect of the inner and outer sealing elements and the intermediate annular cavity, significantly improves sealing reliability, effectively preventing media leakage and providing timely alarms via a connected gas detection device. Furthermore, the double-layer isolation sleeve assembly design ensures that even if the inner isolation sleeve is damaged, the outer isolation sleeve can still effectively block the media, ensuring operational safety and triggering an alarm via a pressure detection device.

Description

Technical Field

[0001] This utility model relates to a magnetic pump. Background Technology

[0002] A magnetic drive pump is a fluid transport device that utilizes the principle of magnetic coupling to achieve contactless transmission. Because magnetic transmission eliminates the need for traditional dynamic seals, it offers superior sealing performance, making it particularly suitable for transporting flammable, explosive, toxic, and valuable media. Taking the Chinese utility model patent with authorization announcement number CN204152803U as an example, the structure of a magnetic drive pump typically includes a pump body, pump cover, pump shaft, outer magnetic sleeve assembly, inner magnetic sleeve assembly, isolation sleeve, and impeller. The pump body and pump cover are fixedly connected to form the working chamber. The pump shaft is connected to the pump cover via a rotating bearing, with its front end extending into the working chamber and housing the impeller, while the rear end is fixed to the inner magnetic sleeve assembly. An isolation sleeve is located on the outside of the inner magnetic sleeve assembly, and its inner cavity communicates with the working chamber, forming a sealed chamber. During operation, the motor drives the outer magnetic sleeve assembly outside the isolation sleeve to rotate, which, through magnetic coupling, drives the inner magnetic sleeve assembly and pump shaft to rotate, thereby driving the impeller to rotate. This allows the medium to be drawn in from the front inlet and discharged from the side outlet under centrifugal force, achieving the pumping of the medium.

[0003] However, existing magnetic drive pumps still pose a risk of leakage during actual operation, especially at the flange connections at the inlet and outlet, and at the mating surface between the pump cover and the pump body. If toxic media (such as liquid chlorine or benzene) are being transported, a leak could release toxic gases that cause serious safety incidents. Furthermore, because the working chamber is connected to the inner cavity of the isolation sleeve, media pressure can be transmitted to the inside of the isolation sleeve. If the inner magnetic sleeve assembly ruptures under prolonged pressure, media leakage may also occur, affecting the safety and reliability of the equipment. Utility Model Content

[0004] This utility model proposes a magnetic pump with leakage monitoring function. Its purpose is to: 1. improve the sealing of the flange connection at the inlet and outlet of the magnetic pump, as well as the joint surface between the pump cover and the pump body; 2. reduce the risk of leakage due to damage to the isolation sleeve.

[0005] The technical solution of this utility model is as follows:

[0006] A magnetic pump with leakage monitoring function includes a pump body, a pump cover, a pump shaft, an impeller, an outer magnetic sleeve assembly, an inner magnetic sleeve assembly, an isolation sleeve assembly, a drive shaft, and a drive disc. The pump body has an inlet pump end flange at its front end connected to an inlet pipe end flange, and an outlet pump end flange on its side connected to an outlet pipe end flange. The pump cover is fixedly installed at the rear end of the pump body, forming a working chamber with the pump body. The pump shaft is rotatably connected to the pump cover, its front end connected to the impeller in the working chamber, and the inner magnetic sleeve assembly installed at its rear end. The isolation sleeve assembly is installed at the rear end of the pump cover. The component is located in the inner cavity of the isolation sleeve assembly. The outer magnetic sleeve assembly is connected to the drive shaft via a drive disk and is used to drive the inner magnetic sleeve assembly to rotate by magnetic force. At least one of the following locations—the connection between the inlet pipe end flange and the inlet pump end flange, the connection between the outlet pipe end flange and the outlet pump end flange, and the connection between the pump cover and the pump body—adopts a double-seal structure. The double-seal structure includes two sealing elements, an inner and an outer one, and an annular cavity located between the two sealing elements and a detection channel connected to the annular cavity. The detection interface at the outer end of the detection channel is used to connect a gas detection device.

[0007] The isolation sleeve assembly is a double-layer isolation sleeve assembly, comprising an inner isolation sleeve and an outer isolation sleeve stacked together.

[0008] As a further improvement to the aforementioned magnetic pump with leakage monitoring function, the double-seal structure at the connection between the inlet pipe end flange and the inlet pump end flange is as follows:

[0009] The inlet pipe flange has a first recess at its end face, a second recess in the middle of the first recess, and a first sealing gasket placed inside the second recess. The thickness of the first sealing gasket is greater than the depth of the second recess. The inlet pump flange has a first boss at its end face that mates with the first recess and is in close contact with the first sealing gasket. A first sealing ring is installed on the outer circumference of the first boss. The first recess, the first boss, and the first sealing gasket form a first annular cavity.

[0010] The inlet pump end flange is provided with a first detection channel. The inner end of the first detection channel is connected to the upper part of the first annular cavity, and the outer end is provided with a first detection interface for connecting the first gas detection device.

[0011] As a further improvement to the aforementioned magnetic pump with leakage monitoring function, the double-seal structure at the connection between the outlet pipe end flange and the outlet pump end flange is as follows:

[0012] The outlet pipe flange has a third recess at its end face, and a fourth recess in the middle of the third recess. A second sealing gasket is placed inside the fourth recess, and the thickness of the second sealing gasket is greater than the depth of the fourth recess. The outlet pump flange has a second boss at its end face that mates with the third recess and is in close contact with the second sealing gasket. A second sealing ring is installed on the outer circumference of the second boss. The third recess, the second boss, and the second sealing gasket form a second annular cavity.

[0013] The outlet pump end flange is provided with a second detection channel. The inner end of the second detection channel is connected to the second annular cavity, and the outer end is provided with a second detection interface for connecting a second gas detection device.

[0014] As a further improvement to the aforementioned magnetic pump with leakage monitoring function, the double-seal structure at the connection between the pump cover and the pump body is as follows:

[0015] The rear end face of the pump body is provided with a fifth recessed platform that connects to the inner cavity of the pump body. The front end of the fifth recessed platform forms a shoulder surface with the inner cavity of the pump body, and a third sealing gasket is placed on the shoulder surface. The front end of the pump cover is provided with a third protrusion. The third protrusion cooperates with the fifth recessed platform, and the front end face is in close contact with the third sealing gasket. The outer circular surface of the third protrusion is provided with an annular groove, which, together with the fifth recessed platform, forms a third annular cavity. A third sealing ring is also installed on the outer circular surface of the third protrusion, and the third sealing ring is located behind the annular groove.

[0016] The pump cover is provided with a third detection channel. The inner end of the third detection channel is connected to the upper part of the third annular cavity, and the outer end is provided with a third detection interface for connecting a third gas detection device.

[0017] As a further improvement to the magnetic pump with leakage monitoring function: there is a sandwich cavity between the inner and outer isolation sleeves, which is filled with liquid medium; the double-layer isolation sleeve assembly is also provided with a pressure detection channel, the inner end of which is connected to the sandwich cavity, and the outer end is provided with a pressure detection connector for connecting a pressure detection device.

[0018] As a further improvement to the magnetic pump with leakage monitoring function: the double-layer isolation sleeve assembly also includes an inner connecting ring, a middle ring and an outer connecting ring arranged sequentially from front to back and fixed together by screws;

[0019] The front end of the inner isolation sleeve is welded to the inner hole of the inner connecting ring, and the front end of the outer isolation sleeve is welded to the inner hole of the outer connecting ring; the inner diameter of the intermediate ring is larger than the inner diameter of the outer connecting ring; the inner connecting ring, the intermediate ring, the outer connecting ring, the inner isolation sleeve, and the outer isolation sleeve form the sandwich cavity.

[0020] As a further improvement to the magnetic pump with leakage monitoring function: the pressure detection channel is located on the intermediate ring.

[0021] As a further improvement to the magnetic pump with leakage monitoring function, sealing rings are installed on both the left and right end faces of the intermediate ring.

[0022] As a further improvement to the aforementioned magnetic pump with leakage monitoring function, it also includes a connector and a bearing housing;

[0023] The connector is cylindrical, with the front end of the bearing seat connected to the rear end of the connector, and the front end of the connector connected to the double-layer isolation sleeve assembly and the pump cover.

[0024] The drive shaft is mounted on a bearing housing via a bearing, the drive disk is mounted on the front end of the drive shaft, and the outer magnetic sleeve assembly is mounted on the front end of the drive disk;

[0025] The rear parts of the outer magnetic sleeve assembly, the drive disk, and the double-layer isolation sleeve assembly are all located in the inner hole of the connector.

[0026] As a further improvement to the magnetic pump with leakage monitoring function: a throttling disc is also installed at the front end of the pump cover, an annular groove is provided on the front end face of the throttling disc, and an annular protrusion is provided at the rear end of the impeller that extends into the annular groove, with a gap between the annular groove and the annular protrusion.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. This utility model adopts a double-seal structure design at the flange connection parts at the inlet and outlet, as well as the joint surface between the pump cover and the pump body. Through the buffer of the inner and outer sealing parts and the middle annular cavity, the sealing reliability is significantly improved and the leakage of media is effectively prevented.

[0029] 2. The annular cavities in each double-sealed structure are connected to an external gas detection device. When the inner seal (sealing gasket) fails, the toxic gas volatilized after the medium seeps into the annular cavity can be detected immediately by the gas detection device, thereby issuing a timely leak alarm and preventing the toxic medium from leaking into the external environment.

[0030] 3. This utility model also adopts a double-layer isolation sleeve assembly design, which consists of inner and outer isolation sleeves, forming a double protective barrier. When the inner isolation sleeve is damaged, the outer isolation sleeve can still effectively block the medium, ensuring operational safety.

[0031] 4. The interlayer cavity between the inner and outer isolation sleeves is filled with liquid medium and connected to a pressure detection device. By monitoring the pressure changes in the interlayer cavity in real time, damage to the inner isolation sleeve can be detected in a timely manner, providing early warning to maintenance personnel and facilitating the implementation of corresponding safety measures. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of this utility model;

[0033] Figure 2 for Figure 1 A magnified view of part A in the middle;

[0034] Figure 3 for Figure 1 A magnified view of part B in the middle section;

[0035] Figure 4 for Figure 1 A magnified view of part C in the middle;

[0036] Figure 5 for Figure 1 A magnified view of part D in the middle.

[0037] Figure label:

[0038] 1. Inlet pump end flange; 2. Inlet pipe end flange; 3. Pump body; 4. Outlet pump end flange; 5. Outlet pipe end flange; 6. Impeller; 7. Throttling disc; 8. Pump cover; 9. Double-layer isolation sleeve assembly; 10. Connecting parts; 11. Outer magnetic sleeve assembly; 12. Drive disc; 13. Drive shaft; 14. Bearing housing; 15. Inner magnetic sleeve assembly; 16. Shaft sleeve; 17. Pump shaft; 18. First sealing gasket; 19. First sealing ring; 20. First annular cavity; 21. First detection channel; 22. Second sealing gasket; 23. Second sealing ring; 24. Second annular cavity; 25. Second detection channel; 26. Third sealing gasket; 27. Third sealing ring; 28. Third annular cavity; 29. ​​Third detection channel; 9-1. Inner connecting ring; 9-2. Inner isolation sleeve; 9-3. Intermediate ring; 9-4. Pressure detection channel; 9-5. Outer connecting ring; 9-6. Outer isolation sleeve. Detailed Implementation

[0039] The technical solution of this utility model will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0040] like Figure 1 A magnetic pump with leakage monitoring function includes components such as pump body 3, pump cover 8, pump shaft 17, impeller 6, outer magnetic sleeve assembly 11, inner magnetic sleeve assembly 15, isolation sleeve assembly, drive shaft 13 and drive disk 12.

[0041] The pump body 3 has an inlet pump end flange 1 at the front end that is connected to the inlet pipe end flange 2, and an outlet pump end flange 4 on the side that is connected to the outlet pipe end flange 5.

[0042] The connection between the inlet pipe end flange 2 and the inlet pump end flange 1 adopts a double sealing structure: such as Figure 2 The inlet pipe flange 2 has a first recess at its end face, and a second recess in the middle of the first recess. A first sealing gasket 18 is placed inside the second recess, and the thickness of the first sealing gasket 18 is greater than the depth of the second recess. The inlet pump flange 1 has a first boss at its end face that mates with the first recess and is in close contact with the first sealing gasket 18. A first sealing ring 19 is installed on the outer circumference of the first boss, and the first sealing ring 19 is in close contact with the inner wall of the first recess. The first recess, the first boss, and the first sealing gasket 18 form a first annular cavity 20.

[0043] The inlet pump end flange 1 is provided with a first detection channel 21. The inner end of the first detection channel 21 is connected to the upper part of the first annular cavity 20, and the outer end is provided with a first detection interface for connecting the first gas detection device.

[0044] If the first sealing gasket 18 is damaged, the toxic medium will enter the first annular cavity 20. At this time, the volatilized gas will be detected by the first gas detection device, which will issue an alarm. At the same time, the pressure of the toxic medium will be reduced under the buffering effect of the first annular cavity 20, and it will not leak directly under the seal of the first sealing ring 19.

[0045] like Figure 3 The outlet pipe flange 5 and the outlet pump flange 4 are connected by the same double-sealing structure: the outlet pipe flange 5 has a third recess on its end face, and a fourth recess in the middle of the third recess. A second sealing gasket 22 is placed inside the fourth recess, and the thickness of the second sealing gasket 22 is greater than the depth of the fourth recess. The outlet pump flange 4 has a second boss on its end face that mates with the third recess and is in close contact with the second sealing gasket 22. A second sealing ring 23 is installed on the outer circumference of the second boss. The third recess, the second boss, and the second sealing gasket 22 form a second annular cavity 24. A second detection channel 25 is provided on the outlet pump flange 4. The inner end of the second detection channel 25 is connected to the second annular cavity 24, and the outer end is provided with a second detection interface for connecting a second gas detection device. The leak-proof sealing principle and detection principle at this location are the same as at the inlet, and will not be described in detail here.

[0046] like Figure 1 The pump cover 8 is fixedly installed at the rear end of the pump body 3, forming a working chamber with the pump body 3. The connection between the pump cover 8 and the pump body 3 also employs a double-seal structure: such as... Figure 4The pump body 3 has a fifth recessed platform on its rear end face that connects to the inner cavity of the pump body 3. The front end of the fifth recessed platform forms a shoulder surface with the inner cavity of the pump body 3, and a third sealing gasket 26 is placed on this shoulder surface. The pump cover 8 has a third protrusion on its front end. The third protrusion mates with the fifth recessed platform, and its front end face is in close contact with the third sealing gasket 26. The outer circular surface of the third protrusion has an annular groove, which, together with the fifth recessed platform, forms a third annular cavity 28. A third sealing ring 27 is also installed on the outer circular surface of the third protrusion. The third sealing ring 27 is located behind the annular groove and is in close contact with the inner wall of the fifth recessed platform. The pump cover 8 has a third detection channel 29. The inner end of the third detection channel 29 is connected to the upper part of the third annular cavity 28, and the outer end has a third detection interface for connecting a third gas detection device. The leak-proof sealing principle and detection principle at this location are the same as those at the inlet and outlet, and will not be described in detail here.

[0047] In this embodiment, the toxic medium being transported is liquid chlorine, and the corresponding gas detection device is an online gas leak detector capable of detecting chlorine gas.

[0048] Furthermore, such as Figure 1 The pump shaft 17 is rotatably connected to the pump cover 8. A bushing 16 is connected to the rear end of the center hole of the pump cover 8. The pump shaft 17 is mounted in the bushing 16 via a sliding bearing assembly. The front end of the pump shaft 17 is connected to the impeller 6 in the working chamber. A throttling disc 7 is also installed at the front end of the pump cover 8. The front end face of the throttling disc 7 has an annular groove, and the rear end of the impeller 6 has an annular protrusion extending into the annular groove. A gap is left between the annular groove and the annular protrusion. The inner magnetic sleeve assembly 15 is installed at the rear end of the pump shaft 17.

[0049] The isolation sleeve assembly is a double-layer isolation sleeve assembly 9, installed at the rear end of the pump cover 8. For example... Figure 5 The double-layer isolation sleeve assembly 9 includes an inner isolation sleeve 9-2 and an outer isolation sleeve 9-6 stacked together, and also includes an inner connecting ring 9-1, a middle ring 9-3, and an outer connecting ring 9-5 arranged sequentially from front to back and fixed together with screws. Sealing rings are installed on the left and right end faces of the middle ring 9-3 to achieve a seal with the components on both sides. The front end of the inner isolation sleeve 9-2 is welded to the inner hole of the inner connecting ring 9-1, and the front end of the outer isolation sleeve 9-6 is welded to the inner hole of the outer connecting ring 9-5. The inner diameter of the middle ring 9-3 is larger than the inner diameter of the outer connecting ring 9-5. The inner connecting ring 9-1, the middle ring 9-3, the outer connecting ring 9-5, the inner isolation sleeve 9-2, and the outer isolation sleeve 9-6 form a sandwich cavity.

[0050] The interlayer cavity is filled with a liquid medium. A pressure detection channel 9-4 is also provided on the intermediate ring 9-3. The inner end of the pressure detection channel 9-4 is connected to the interlayer cavity, and the outer end is provided with a pressure detection connector for connecting a pressure detection device. The pressure detection device is preferably a digital display pressure controller, which can display the pressure value in real time and immediately send a signal when the pressure value exceeds a preset threshold.

[0051] like Figure 1 The inner magnetic sleeve assembly 15 is located within the inner cavity of the isolation sleeve assembly. The outer magnetic sleeve assembly 11 is connected to the drive shaft 13 via the drive disk 12, and is used to drive the inner magnetic sleeve assembly 15 to rotate magnetically. Specifically, the magnetic pump also includes a connector 10 and a bearing seat 14. The connector 10 is cylindrical, and the front end of the bearing seat 14 is connected to the rear end of the connector 10. The front end of the connector 10 is connected to the inner connecting ring 9-1, the intermediate ring 9-3, the outer connecting ring 9-5, and the pump cover 8 via studs. The drive shaft 13 is mounted on the bearing seat 14 via two sets of deep groove ball bearings. The front end of the drive shaft 13 is mounted to the drive disk 12 via a flat key and screws, and the outer magnetic sleeve assembly 11 is mounted to the front end of the drive disk 12 via screws. The rear ends of the outer magnetic sleeve assembly 11, the drive disk 12, and the double-layer isolation sleeve assembly 9 are all located within the inner hole of the connector 10.

[0052] During operation, the drive shaft 13 drives the outer magnetic sleeve assembly 11 to rotate. The outer magnetic sleeve assembly 11, through magnetic force, drives the inner magnetic sleeve assembly 15 to rotate, which in turn drives the pump shaft 17 and impeller 6 to rotate. The centrifugal force of the impeller 6 generates suction at the front inlet. After the medium is sucked in, it is output from the outlet under the action of centrifugal force. At the same time, under the action of suction, the medium will fill the inner cavity of the isolation sleeve. Under normal conditions, the liquid medium (this medium is non-toxic, not the toxic medium being transported) in the interlayer cavity of the double-layer isolation sleeve assembly 9 is in a static pressure state with very low pressure. If the inner isolation sleeve 9-2 ruptures, the toxic medium will enter the interlayer cavity. Under the action of the suction of the impeller 6, the pressure value of the interlayer cavity will rise, and the pressure detection device will issue an alarm, reminding the staff to replace the isolation sleeve in time.

[0053] It should be noted that, as will be apparent to those skilled in the art, this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. The scope of this utility model is defined by the claims rather than the foregoing description.

Claims

1. A magnetic pump with leakage monitoring function, comprising a pump body (3), a pump cover (8), a pump shaft (17), an impeller (6), an outer magnetic sleeve assembly (11), an inner magnetic sleeve assembly (15), an isolation sleeve assembly, a drive shaft (13), and a drive disc (12), wherein the pump body (3) has an inlet pump end flange (1) connected to an inlet pipe end flange (2) at its front end, and an outlet pump end flange (4) connected to an outlet pipe end flange (5) on its side; the pump cover (8) is fixedly installed on the pump body (3). The pump shaft (17) is rotatably connected to the pump cover (8), the front end is connected to the impeller (6) in the working chamber, and the rear end is equipped with the inner magnetic sleeve assembly (15). The isolation sleeve assembly is installed at the rear end of the pump cover (8). The inner magnetic sleeve assembly (15) is located in the inner cavity of the isolation sleeve assembly. The outer magnetic sleeve assembly (11) is connected to the drive shaft (13) through the drive disk (12) and is used to drive the inner magnetic sleeve assembly (15) to rotate by magnetic force. The characteristic of the assembly is: At least one of the following locations—the connection between the inlet pipe end flange (2) and the inlet pump end flange (1), the connection between the outlet pipe end flange (5) and the outlet pump end flange (4), and the connection between the pump cover (8) and the pump body (3)—adopts a double-sealing structure. The double-sealing structure includes two sealing elements, an inner and an outer one, an annular cavity located between the two sealing elements, and a detection channel connected to the annular cavity. The detection interface at the outer end of the detection channel is used to connect a gas detection device. The isolation sleeve assembly is a double-layer isolation sleeve assembly (9), including an inner isolation sleeve (9-2) and an outer isolation sleeve (9-6) stacked together.

2. The magnetic pump with leakage monitoring function as described in claim 1, characterized in that, The double-seal structure at the connection between the inlet pipe end flange (2) and the inlet pump end flange (1) is as follows: The inlet pipe end flange (2) has a first recessed platform at its end face, and a second recessed platform in the middle of the first recessed platform. A first sealing gasket (18) is placed in the second recessed platform, and the thickness of the first sealing gasket (18) is greater than the depth of the second recessed platform. The inlet pump end flange (1) has a first boss at its end face that matches the first recessed platform and is in close contact with the first sealing gasket (18). A first sealing ring (19) is installed on the outer circular surface of the first boss. The first recessed platform, the first boss, and the first sealing gasket (18) form a first annular cavity (20). The inlet pump end flange (1) is provided with a first detection channel (21), the inner end of the first detection channel (21) is connected to the upper part of the first annular cavity (20), and the outer end is provided with a first detection interface for connecting the first gas detection device.

3. The magnetic pump with leakage monitoring function as described in claim 1, characterized in that, The double-seal structure at the connection between the outlet pipe end flange (5) and the outlet pump end flange (4) is as follows: The outlet pipe end flange (5) has a third recessed platform at its end face, and a fourth recessed platform in the middle of the third recessed platform. A second sealing gasket (22) is placed inside the fourth recessed platform, and the thickness of the second sealing gasket (22) is greater than the depth of the fourth recessed platform. The outlet pump end flange (4) has a second boss at its end face that matches the third recessed platform and is in close contact with the second sealing gasket (22). A second sealing ring (23) is installed on the outer circular surface of the second boss. The third recessed platform, the second boss, and the second sealing gasket (22) form a second annular cavity (24). The outlet pump end flange (4) is provided with a second detection channel (25), the inner end of the second detection channel (25) is connected to the second annular cavity (24), and the outer end is provided with a second detection interface for connecting the second gas detection device.

4. The magnetic pump with leakage monitoring function as described in claim 1, characterized in that, The double-seal structure at the connection between the pump cover (8) and the pump body (3) is as follows: The rear end face of the pump body (3) is provided with a fifth recessed platform that connects to the inner cavity of the pump body (3). The front end of the fifth recessed platform forms a shoulder surface with the inner cavity of the pump body (3). A third sealing gasket (26) is placed on the shoulder surface. The front end of the pump cover (8) is provided with a third protrusion. The third protrusion cooperates with the fifth recessed platform, and the front end face is in close contact with the third sealing gasket (26). An annular groove is provided on the outer circular surface of the third protrusion. The annular groove and the fifth recessed platform form a third annular cavity (28). A third sealing ring (27) is also installed on the outer circular surface of the third protrusion. The third sealing ring (27) is located on the rear side of the annular groove. The pump cover (8) is provided with a third detection channel (29), the inner end of the third detection channel (29) is connected to the upper part of the third annular cavity (28), and the outer end is provided with a third detection interface for connecting a third gas detection device.

5. The magnetic pump with leakage monitoring function as described in claim 1, characterized in that: There is a sandwich cavity between the inner isolation sleeve (9-2) and the outer isolation sleeve (9-6), and the sandwich cavity is filled with liquid medium; the double-layer isolation sleeve assembly (9) is also provided with a pressure detection channel (9-4), the inner end of the pressure detection channel (9-4) is connected to the sandwich cavity, and the outer end is provided with a pressure detection connector for connecting a pressure detection device.

6. The magnetic pump with leakage monitoring function as described in claim 5, characterized in that: The double-layer isolation sleeve assembly (9) also includes an inner connecting ring (9-1), a middle ring (9-3) and an outer connecting ring (9-5) arranged from front to back and fixed together by screws. The front end of the inner isolation sleeve (9-2) is welded to the inner hole of the inner connecting ring (9-1) as a whole, and the front end of the outer isolation sleeve (9-6) is welded to the inner hole of the outer connecting ring (9-5) as a whole; the inner diameter of the intermediate ring (9-3) is larger than the inner diameter of the outer connecting ring (9-5); the inner connecting ring (9-1), the intermediate ring (9-3), the outer connecting ring (9-5), the inner isolation sleeve (9-2), and the outer isolation sleeve (9-6) form the sandwich cavity.

7. The magnetic pump with leakage monitoring function as described in claim 6, characterized in that: The pressure detection channel (9-4) is located on the intermediate ring (9-3).

8. The magnetic pump with leakage monitoring function as described in claim 6, characterized in that: Sealing rings are installed on both the left and right end faces of the intermediate ring (9-3).

9. The magnetic pump with leakage monitoring function as described in claim 1, characterized in that: It also includes a connector (10) and a bearing housing (14); The connector (10) is cylindrical, the front end of the bearing seat (14) is connected to the rear end of the connector (10), and the front end of the connector (10) is connected to the double-layer isolation sleeve assembly (9) and the pump cover (8). The drive shaft (13) is mounted on the bearing seat (14) via a bearing, the drive disk (12) is mounted at the front end of the drive shaft (13), and the outer magnetic sleeve assembly (11) is mounted at the front end of the drive disk (12). The rear of the outer magnetic sleeve assembly (11), the drive disk (12), and the double-layer isolation sleeve assembly (9) are all located in the inner hole of the connector (10).

10. The magnetic pump with leakage monitoring function as described in claim 1, characterized in that: The front end of the pump cover (8) is also equipped with a throttling disc (7). The front end surface of the throttling disc (7) is provided with an annular groove, and the rear end of the impeller (6) is provided with an annular protrusion that extends into the annular groove. A gap is left between the annular groove and the annular protrusion.

Images