Adjustable mechanical seal structure for double-pipe jet pump

Abstract

The application relates to the technical field of jet pump sealing, in particular to an adjustable mechanical sealing structure for a double-pipe jet pump, which comprises an ejecting fluid guide pipe, the ejecting fluid guide pipe is connected with a working fluid guide pipe, and further comprises a pressure feedback pre-tightening structure connected with the ejecting fluid guide pipe; and an elastic deformation sealing structure installed between the ejecting fluid guide pipe and the working fluid guide pipe, the elastic deformation sealing structure comprises a driven elastic deformation part installed in the working fluid guide pipe, the driven elastic deformation part is fixedly connected with a second sealing ring, and a magnetic attraction part is installed on the end face of the ejecting fluid guide pipe. The pressure feedback pre-tightening structure and the elastic deformation sealing structure are matched with each other to realize double pre-tightening sealing, resist the abrasion caused by working, and improve the long-term effectiveness and stability of the sealing.

Description

Technical Field

[0001] This invention relates to the field of jet pump sealing technology, specifically an adjustable mechanical seal structure for a dual-tube jet pump. Background Technology

[0002] A jet pump is a device that uses a working fluid and a nozzle to form a high-speed, low-pressure jet. It mainly consists of an ejector fluid conduit and a working fluid conduit. It primarily utilizes shearing action and localized low pressure to drive the flow of the working fluid, achieving the effects of transporting the working fluid and increasing pressure, while also providing a certain degree of mixing. Jet pumps have advantages such as simple structure, no moving parts, easy sealing, reliable operation, and convenient maintenance.

[0003] Sealing performance is fundamental to the efficient, safe, and reliable operation of a dual-tube jet pump system. It directly determines drainage efficiency, energy consumption, operational safety, and equipment lifespan. Sealing failure can lead to serious consequences such as short circuits in the power fluid, a sharp drop in efficiency, and formation contamination. Therefore, sealing integrity must be ensured from multiple dimensions, including structural design, material selection, and adaptation to operating conditions. Conventional jet pumps simply use a single sealing ring to connect the ejector fluid conduit and the working fluid conduit. This provides a limited sealing effect, and the sealing performance gradually decreases with wear, making long-term effective sealing impossible. Summary of the Invention

[0004] The purpose of this invention is to provide an adjustable mechanical seal structure for a dual-tube jet pump to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An adjustable mechanical seal structure for a dual-tube jet pump includes a working fluid conduit and an ejector fluid conduit located inside the working fluid conduit and colinear with the axis of the working fluid conduit, and further includes:

[0007] A pressure feedback pre-tightening structure connected to an ejector fluid conduit includes multiple sets of hydraulic lines disposed within the ejector fluid conduit, and an installation cavity and an annular hydraulic cavity respectively connected to both ends of the hydraulic lines. The annular hydraulic cavity is disposed within the ejector fluid conduit, and an annular elastic metal sheet and a leak-proof membrane are fixedly installed radially from the inside to the outside within the annular hydraulic cavity. An isolation cavity is formed between the leak-proof membrane and the annular elastic metal sheet. The isolation cavity is disposed within the annular hydraulic cavity and is independently disposed from the hydraulic lines. A return spring is fixedly installed within the installation cavity, and a movable frame is fixedly connected to the return spring and slidably installed within the installation cavity. A compression plate is fixedly connected to the movable frame. A first sealing ring is disposed between the ejector fluid conduit and the working fluid conduit, and the compression plate abuts against the end face of the first sealing ring away from the working fluid conduit.

[0008] An elastic deformation sealing structure is installed between an ejector fluid conduit and a working fluid conduit. The elastic deformation sealing structure includes a driven elastic deformation part, a second sealing ring, and a magnetic attraction part. The driven elastic deformation part is disposed inside the working fluid conduit and is fixedly connected to the second sealing ring. The second sealing ring is in contact with the ejector fluid conduit. The magnetic attraction part is disposed on the end face of the ejector fluid conduit. Through the magnetic attraction of the driven elastic deformation part, the driven elastic deformation part applies continuous pressure to the second sealing ring, thereby making the second sealing ring continuously adhere to the outer wall of the ejector fluid conduit.

[0009] As a further improvement of the present invention: the driven elastic deformation part includes a sleeve, a funnel-shaped elastic metal sheet, a concave annular elastic sheet, and a first magnet. The sleeve is fixedly installed inside the working fluid conduit. The funnel-shaped elastic metal sheet is fixedly connected to the inner wall of the working fluid conduit and to the second sealing ring. The second sealing ring abuts against the outer wall of the ejector fluid conduit. The inner circular surface of the funnel-shaped elastic metal sheet and the sleeve are jointly fixedly connected to the concave annular elastic sheet. The first magnet is fixedly connected to the concave annular elastic sheet. A limiting plate is fixedly installed on the sleeve. The limiting plate is disposed between the concave annular elastic sheet and the funnel-shaped elastic metal sheet.

[0010] As a further improvement of the present invention: the magnetic suction part includes a second magnet and an auxiliary frame fixedly connected to the second magnet, and both the auxiliary frame and the second magnet are detachably connected to the ejector fluid conduit.

[0011] As a further improvement of the present invention: the ejector fluid conduit is threadedly connected with an oil replenishing bolt, one end of which extends into a set of hydraulic lines.

[0012] As a further improvement of the present invention: the radial cross-section of the leak-proof membrane is corrugated.

[0013] As a further improvement of the present invention: an annular groove is provided on the outer wall of the ejector fluid conduit, and the annular groove is movably connected to the first sealing ring.

[0014] As a further improvement of the present invention: the sleeve abuts against the outer wall of the ejector fluid conduit.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] In use, bolts are used to connect the ejector fluid conduit and the working fluid conduit. As the ejector fluid flows through the ejector fluid conduit, the annular elastic metal sheet is squeezed by the ejector fluid, which in turn squeezes the fluid medium in the isolation chamber. The fluid medium deforms the leak-proof membrane, allowing hydraulic oil from the hydraulic line to enter the mounting chamber. The oil in the mounting chamber pushes the moving frame to move, which in turn moves the extrusion plate, causing the extrusion plate to squeeze the first sealing ring. When the first sealing ring wears, it deforms under pressure, allowing it to adhere tightly to the ejector fluid conduit and the working fluid conduit, thereby improving the sealing performance. After the ejector fluid conduit and the working fluid conduit are combined, the magnetic attraction of the driven elastic deformation part causes it to deform, which in turn applies continuous pressure to the second sealing ring, keeping it tightly against the outer wall of the ejector fluid conduit. With the combined sealing of the first and second sealing rings, a double seal is achieved. This invention achieves a double pre-tightening seal by combining a pressure feedback pre-tightening structure with an elastic deformation sealing structure. This maintains the sealing effect of the dual-tube jet pump's sealing structure even when it wears down, thereby improving the longevity and stability of the seal. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0018] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0019] Figure 3 for Figure 1 A magnified view of a portion of point B in the middle.

[0020] Figure 4 This is a schematic diagram of the structure of the present invention.

[0021] Figure 5 This is a schematic diagram of the structure of the second sealing ring and the bucket-shaped elastic metal sheet of the present invention.

[0022] Figure 6 This is a three-dimensional structural diagram of the concave annular elastic sheet and the first magnet of the present invention.

[0023] Figure 7 This is a three-dimensional structural diagram of the magnetic suction part of the present invention.

[0024] Figure 8 This is a three-dimensional structural diagram of the movable frame and the extrusion plate of the present invention.

[0025] In the diagram: 1. Ejector fluid conduit; 2. Mounting cavity; 3. Working fluid conduit; 4. Pressure feedback pre-tightening structure; 5. Annular hydraulic cavity; 6. Leak-proof membrane; 7. Annular elastic metal sheet; 8. Isolation cavity; 9. Hydraulic pipeline; 10. Moving frame; 11. Extrusion plate; 12. First sealing ring; 13. Elastic deformation sealing structure; 14. Driven elastic deformation part; 15. Second sealing ring; 16. Magnetic suction part; 17. Sleeve; 18. Bucket-shaped elastic metal sheet; 19. Return spring; 20. Concave annular elastic sheet; 21. First magnet; 22. Limiting plate; 23. Second magnet; 24. Assist frame; 25. Oil filling bolt; 26. Annular groove. Detailed Implementation

[0026] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0027] Example 1, see Figures 1 to 8 As shown, an adjustable mechanical seal structure for a dual-tube jet pump includes a working fluid conduit 3 and an ejector fluid conduit 1 located inside the working fluid conduit 3 and colinear with the axis of the working fluid conduit 3, and further includes:

[0028] A pressure feedback pre-tightening structure 4 is connected to the ejector fluid conduit 1. The pressure feedback pre-tightening structure 4 includes multiple sets of hydraulic lines 9 disposed within the ejector fluid conduit 1, and an installation cavity 2 and an annular hydraulic cavity 5 respectively connected to both ends of the hydraulic lines 9. The annular hydraulic cavity 5 is disposed within the ejector fluid conduit 1. An annular elastic metal sheet 7 and a leak-proof membrane 6 are fixedly installed radially from the inside to the outside within the annular hydraulic cavity 5. An isolation cavity 8 is formed between the leak-proof membrane 6 and the annular elastic metal sheet 7. The isolation cavity 8 is disposed within the annular hydraulic cavity 5 and is independently disposed from the hydraulic lines 9. When the annular elastic metal sheet 7 is damaged, the flow in the isolation cavity 8 is interrupted. The fluid medium leaks, but the hydraulic oil is blocked by the anti-leakage membrane 6 to prevent the hydraulic oil from leaking directly. This means that only the annular elastic metal sheet 7 needs to be repaired afterward. It also prevents the hydraulic oil from contaminating the fluid transported by the dual-pipe jet pump. A return spring 19 is fixedly installed in the mounting cavity 2. The return spring 19 is fixedly connected to a movable frame 10 that is slidably installed in the mounting cavity 2. The movable frame 10 is fixedly connected to a squeezing plate 11. The squeezing plate 11 is a rigid structure and is located outside the mounting cavity 2. A first sealing ring 12 is provided between the ejector fluid conduit 1 and the working fluid conduit 3. The end face of the squeezing plate 11 and the first sealing ring 12 away from the working fluid conduit 3 abuts against each other.

[0029] An elastic deformation sealing structure 13 is installed between the ejector fluid conduit 1 and the working fluid conduit 3. The elastic deformation sealing structure 13 includes a driven elastic deformation part 14, a second sealing ring 15, and a magnetic attraction part 16. The driven elastic deformation part 14 is disposed inside the working fluid conduit 3 and is fixedly connected to the second sealing ring 15. The second sealing ring 15 is in contact with the ejector fluid conduit 1. The magnetic attraction part 16 is disposed on the end face of the ejector fluid conduit 1. Through the magnetic attraction of the driven elastic deformation part 14 by the magnetic attraction part 16, the driven elastic deformation part 14 applies continuous pressure to the second sealing ring 15, thereby making the second sealing ring 15 continuously adhere to the outer wall of the ejector fluid conduit 1.

[0030] In use, bolts are used to connect the ejector fluid conduit 1 and the working fluid conduit 3. As the ejector fluid flows through the ejector fluid conduit 1, the annular elastic metal sheet 7 is compressed by the ejector fluid, causing the fluid medium in the isolation chamber 8 to be compressed. The fluid medium compresses the leak-proof membrane 6, causing hydraulic oil in the hydraulic line 9 to enter the mounting chamber 2. The oil in the mounting chamber 2 pushes the moving frame 10 to move, and the moving frame 10 drives the compression plate 11 to move, causing the compression plate 11 to compress the first sealing ring 12. When the first sealing ring 12 wears, The first sealing ring 12 is deformed under pressure, causing it to adhere tightly to the ejector fluid conduit 1 and the working fluid conduit 3, thereby improving sealing performance. After the ejector fluid conduit 1 and the working fluid conduit 3 are combined, the magnetic attraction part 16 magnetically attracts the driven elastic deformation part 14, causing it to deform. This causes the driven elastic deformation part 14 to apply continuous pressure to the second sealing ring 15, ensuring that the second sealing ring 15 remains tightly against the outer wall of the ejector fluid conduit 1. The combined sealing of the first sealing ring 12 and the second sealing ring 15 achieves a double seal. This invention achieves a double pre-tightening seal by cooperating with the pressure feedback pre-tightening structure 4 and the elastic deformation sealing structure 13. Even when the sealing structure of the dual-tube jet pump wears, it maintains the sealing effect of the dual-tube jet pump's sealing structure, thus improving the longevity and stability of the seal.

[0031] In some embodiments, the driven elastic deformation part 14 includes a sleeve 17, a bucket-shaped elastic metal sheet 18, a concave annular elastic sheet 20, and a first magnet 21. The sleeve 17 is fixedly installed inside the working fluid conduit 3. The bucket-shaped elastic metal sheet 18 is fixedly connected to the inner wall of the working fluid conduit 3 and to the second sealing ring 15. The second sealing ring 15 abuts against the outer wall of the ejector fluid conduit 1. The inner circular surface of the bucket-shaped elastic metal sheet 18 and the sleeve 17 are jointly fixedly connected to the concave annular elastic sheet 20. The first magnet 21 is fixedly connected to the concave annular elastic sheet 20. A limiting plate 22 is fixedly installed on the sleeve 17 and is disposed between the concave annular elastic sheet 20 and the bucket-shaped elastic metal sheet 18. When installing the ejector fluid conduit 1, the concave annular elastic sheet 20 bends away from the magnetic suction part 16 and abuts against the limiting plate 22, so that the concave annular elastic sheet 20 supports the funnel-shaped elastic metal sheet 18. After the ejector fluid conduit 1 is installed into the working fluid conduit 3, the second magnet 23 is used to magnetically attract the first magnet 21. The first magnet 21 pulls the concave annular elastic sheet 20, so that the concave annular elastic sheet 20 bends and deforms away from the limiting plate 22. The concave annular elastic sheet 20 tightens the funnel-shaped elastic metal sheet 18, thereby causing the funnel-shaped elastic metal sheet 18 to apply pressure to the second sealing ring 15 in conjunction with the deformation of the funnel-shaped elastic metal sheet 18 under air pressure, so as to ensure that the second sealing ring 15 fits tightly against the ejector fluid conduit 1. When the second sealing ring 15 is worn, the second sealing ring 15 is deformed by pressure to fill the gap caused by wear and extend the sealing cycle.

[0032] In some embodiments, the magnetic attraction part 16 includes a second magnet 23 and an auxiliary frame 24 fixedly connected to the second magnet 23. Both the auxiliary frame 24 and the second magnet 23 are detachably connected to the ejector fluid conduit 1. The second magnet 23 is used to magnetically attract the first magnet 21, and the auxiliary frame 24 is provided to provide a force application position for moving the magnetic attraction part 16.

[0033] In some embodiments, the ejector fluid conduit 1 is threadedly connected to a replenishing bolt 25, one end of which extends into a set of hydraulic lines 9. The replenishing bolt 25 is removed to facilitate the replenishment of hydraulic fluid into the hydraulic lines 9.

[0034] In some embodiments, the radial cross-section of the leak-proof membrane 6 is corrugated. By setting the radial cross-section of the leak-proof membrane 6 to be corrugated, a deformation allowance is provided while the leak-proof membrane 6 is deformed under pressure, thus preventing the leak-proof membrane 6 from rupturing.

[0035] In some embodiments, an annular groove 26 is formed on the outer wall of the ejector fluid conduit 1, and the annular groove 26 is movably connected to the first sealing ring 12. By providing the annular groove 26, the first sealing ring 12 can be installed together with the ejector fluid conduit 1 into the working fluid conduit 3 during installation.

[0036] In some of these embodiments, see Figure 1 The sleeve 17 abuts against the outer wall of the ejector fluid conduit 1. The sleeve 17 is used to stabilize the ejector fluid conduit 1, thereby reducing the vibration generated by the ejector fluid passing through the ejector fluid conduit 1, and further reducing the gap width between the ejector fluid conduit 1 and the first sealing ring 12 and the second sealing ring 15.

[0037] Working Principle: In use, the ejector fluid conduit 1 and the working fluid conduit 3 are combined using bolts. When the ejector fluid is ejected from the ejector fluid conduit 1, the annular elastic metal sheet 7 is compressed by the ejector fluid, which in turn compresses the fluid medium in the isolation chamber 8. The fluid medium compresses and deforms the leak-proof membrane 6, which in turn compresses the hydraulic oil in the annular hydraulic chamber 5. The hydraulic oil is then forced into the hydraulic line 9, causing it to be pressurized and enter the mounting chamber 2. The oil in the mounting chamber 2 pushes the moving frame 10 to move, which in turn moves the extrusion plate 11. The extrusion plate 11 then compresses the first sealing ring 12. When the first sealing ring 12 wears, it deforms under the pressure of the extrusion plate 11, filling the gap caused by wear and ensuring that the first sealing ring 12 is tightly fitted to the ejector fluid conduit 1. The working fluid conduit 3 and the ejector fluid conduit 1 are combined to improve sealing performance. After the ejector fluid conduit 1 and the working fluid conduit 3 are combined, the first magnet 21 is attracted by the second magnet 23. The first magnet 21 pulls the concave annular elastic sheet 20 so that the concave annular elastic sheet 20 bends and deforms away from the limiting plate 22. The concave annular elastic sheet 20 tightens the bucket-shaped elastic metal sheet 18, which in turn applies pressure to the second sealing ring 15. The deformation of the bucket-shaped elastic metal sheet 18 under air pressure makes the second sealing ring 15 fit tightly against the ejector fluid conduit 1. When the second sealing ring 15 is worn, the second sealing ring 15 is deformed by pressure to fill the gap caused by wear and extend the sealing cycle. Under the joint sealing of the first sealing ring 12 and the second sealing ring 15, a double seal is achieved, which improves the sealing effect and extends the sealing cycle.

[0038] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. An adjustable mechanical seal structure for a dual-tube jet pump, characterized in that, The system includes a working fluid conduit and an ejector fluid conduit located inside the working fluid conduit and collinear with the axis of the working fluid conduit, and further includes: A pressure feedback pre-tightening structure connected to an ejector fluid conduit includes multiple sets of hydraulic lines disposed within the ejector fluid conduit, and an installation cavity and an annular hydraulic cavity respectively connected to both ends of the hydraulic lines. The annular hydraulic cavity is disposed within the ejector fluid conduit, and an annular elastic metal sheet and a leak-proof membrane are fixedly installed radially from the inside to the outside within the annular hydraulic cavity. An isolation cavity is formed between the leak-proof membrane and the annular elastic metal sheet. The isolation cavity is disposed within the annular hydraulic cavity and is independently disposed from the hydraulic lines. A return spring is fixedly installed within the installation cavity, and a movable frame is fixedly connected to the return spring and slidably installed within the installation cavity. A compression plate is fixedly connected to the movable frame. A first sealing ring is disposed between the ejector fluid conduit and the working fluid conduit, and the compression plate abuts against the end face of the first sealing ring away from the working fluid conduit. An elastic deformation sealing structure is installed between an ejector fluid conduit and a working fluid conduit. The elastic deformation sealing structure includes a driven elastic deformation part, a second sealing ring, and a magnetic attraction part. The driven elastic deformation part is disposed inside the working fluid conduit and is fixedly connected to the second sealing ring. The second sealing ring is in contact with the ejector fluid conduit. The magnetic attraction part is disposed on the end face of the ejector fluid conduit. Through the magnetic attraction of the driven elastic deformation part, the driven elastic deformation part applies continuous pressure to the second sealing ring, thereby making the second sealing ring continuously adhere to the outer wall of the ejector fluid conduit.

2. The adjustable mechanical seal structure for a dual-tube jet pump according to claim 1, characterized in that, The driven elastic deformation part includes a sleeve, a bucket-shaped elastic metal sheet, a concave annular elastic sheet, and a first magnet. The sleeve is fixedly installed inside the working fluid conduit. The bucket-shaped elastic metal sheet is fixedly connected to the inner wall of the working fluid conduit and to a second sealing ring. The second sealing ring abuts against the outer wall of the ejector fluid conduit. The inner circular surface of the bucket-shaped elastic metal sheet and the sleeve are both fixedly connected to a concave annular elastic sheet. The first magnet is fixedly connected to the concave annular elastic sheet. A limiting plate is fixedly installed on the sleeve, and the limiting plate is disposed between the concave annular elastic sheet and the bucket-shaped elastic metal sheet.

3. The adjustable mechanical seal structure for a dual-tube jet pump according to claim 1, characterized in that, The magnetic suction part includes a second magnet and an auxiliary frame fixedly connected to the second magnet. Both the auxiliary frame and the second magnet are detachably connected to the ejector fluid conduit.

4. The adjustable mechanical seal structure for a dual-tube jet pump according to claim 1, characterized in that, The ejector fluid conduit is threadedly connected to an oil replenishing bolt, one end of which extends into a set of hydraulic lines.

5. The adjustable mechanical seal structure for a dual-tube jet pump according to claim 1, characterized in that, The radial cross-section of the leak-proof membrane is corrugated.

6. The adjustable mechanical seal structure for a dual-tube jet pump according to claim 1, characterized in that, An annular groove is formed on the outer wall of the ejector fluid conduit, and the annular groove is movably connected to the first sealing ring.

7. The adjustable mechanical seal structure for a dual-tube jet pump according to claim 2, characterized in that, The sleeve abuts against the outer wall of the ejector fluid conduit.

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