Mechanical sealing structure of bearing for pump

Abstract

The invention relates to the technical field of mechanical sealing, and discloses a pump bearing mechanical sealing structure which comprises a pump outer shell. The movable shaft is rotationally mounted in the pump outer shell; the mounting seat is fixed in the pump outer shell; the static sealing seat is fixed in the pump outer shell; the static sealing ring is arranged on the static sealing seat; the dynamic sealing structure is arranged in the pump outer shell, and the dynamic sealing structure is matched with the static sealing ring to form mechanical sealing; and the mounting bracket is fixed in the pump outer shell. By arranging the dynamic sealing structure, after the pump body stops working, the dynamic sealing ring and the static sealing ring are separated from each other through a series of mechanical operations, the dynamic sealing ring and the static sealing ring can be conveniently and thoroughly washed and cleaned, then impurities attached to the dynamic sealing ring and the static sealing ring can be effectively removed by introducing water to a specific part and utilizing the flowing effect of water flow, and the service life of the pump body is prolonged. Therefore, abrasion of the impurities to the sealing ring is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical seals, and in particular to a bearing mechanical seal structure for a pump. Background Art

[0002] The mechanical seal structure of pump bearings is a device that limits the leakage of working fluid along the rotating shaft. It is mainly composed of static rings, dynamic rings, elastic elements, transmission elements, and auxiliary sealing rings.

[0003] After searching, the Chinese patent with announcement number CN212028352U discloses a corrosion-resistant mechanical seal, which includes a housing, a ceramic flange, a sleeve and a mechanical sealing device. The ceramic flange is fixed to the bottom of the housing, a clamping device is installed on the top of the sleeve, the sleeve includes an enamel sleeve and a stainless steel sleeve, the ceramic sleeve is embedded in the stainless steel sleeve, the mechanical sealing device includes a medium side dynamic ring, an atmospheric side dynamic ring, a medium side static ring and an atmospheric side static ring, the medium side static ring is fixed to the ceramic flange, the atmospheric side static ring is fixed to the bearing seat, the medium side dynamic ring and the atmospheric side dynamic ring are located between the medium side static ring and the atmospheric side static ring, a spring seat is provided between the medium side dynamic ring and the atmospheric side dynamic ring, a limit screw is installed on the spring seat, the limit screw passes through the stainless steel sleeve and is inserted into the ring groove on the outer wall of the ceramic sleeve, and the spring passes through the spring seat to resist the atmospheric side dynamic ring and the medium side dynamic ring. The device provided by the above scheme has good sealing effect and strong corrosion resistance. However, the above scheme still has the following shortcomings when it is actually used:

[0004] The mechanical seal proposed in the above scheme does not have a cleaning function. With the use of the mechanical seal, impurities in the liquid are easily attached to the sealing surface. First, the attachment of impurities to the sealing surface will cause the wear of the sealing surface to increase. The sealing surface of the mechanical seal usually requires extremely high flatness and finish to ensure its sealing performance. However, when impurities such as particles, fibers, etc. are attached to the sealing surface, they will form abrasives between the sealing surfaces, aggravating the wear of the sealing surface. This wear will not only reduce the service life of the sealing surface, but also destroy its sealing effect, resulting in increased leakage. Secondly, the attachment of impurities may also cause vibration and noise of the mechanical seal. When impurities accumulate to a certain extent between the sealing surfaces, they will change the gap and contact state of the sealing surfaces, causing the mechanical seal to generate vibration and noise during operation. This vibration and noise will not only affect the normal operation of the equipment, but may also cause damage to other parts of the equipment.

[0005] Therefore, it is necessary to design a pump bearing mechanical seal structure to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings in the prior art and to propose a mechanical seal structure for a pump bearing.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A bearing mechanical seal structure for a pump, comprising:

[0009] Pump outer casing;

[0010] A driving shaft, rotatably mounted inside the pump outer shell;

[0011] A mounting seat, fixed inside the pump outer shell;

[0012] A static sealing seat, fixed inside the pump outer shell;

[0013] A static sealing ring, arranged on the static sealing seat;

[0014] A dynamic sealing structure is arranged inside the pump outer shell, and the dynamic sealing structure cooperates with a static sealing ring to form a mechanical seal;

[0015] A mounting bracket fixed inside the pump outer shell;

[0016] an electromagnet, mounted on the mounting bracket;

[0017] A ball seat, rotatably mounted in the mounting seat, and a circulation channel is provided on the ball seat;

[0018] A valve stem passes through a pump outer shell and a mounting seat, the pump outer shell and the mounting seat are both rotatably connected to the valve stem, and one end of the valve stem is fixedly connected to a ball seat.

[0019] As a preferred technical solution of the present invention, the dynamic sealing structure includes:

[0020] A dynamic sealing seat, slidably disposed on the inner surface of the pump outer shell;

[0021] A mounting ring, mounted on the dynamic seal seat, wherein the mounting ring is made of magnetic material;

[0022] A dynamic sealing ring is fixed on the mounting ring and arranged facing the static sealing seat;

[0023] A plurality of first springs have one end connected to the dynamic sealing seat and the other end connected to the mounting ring.

[0024] As a preferred technical solution of the present invention, the dynamic sealing ring is a hollow structure, and an inflatable structure is provided on the dynamic shaft, and the inflatable structure includes:

[0025] A first sealing cylinder is fixed on the dynamic shaft, and the first sealing cylinder is connected to the dynamic sealing ring through a hose;

[0026] a first sliding plug, sealingly and slidably connected to the inner surface of the first sealing cylinder;

[0027] a second spring, one end of which is connected to the first sealing cylinder, and the other end of which is connected to the first sliding plug;

[0028] A first observation window is provided on the first sealing cylinder;

[0029] The second observation window is provided on the pump outer shell and is arranged opposite to the first observation window.

[0030] As a preferred technical solution of the present invention, a color ribbon is provided on the first sliding plug.

[0031] As a preferred technical solution of the present invention, a lubrication structure is provided inside the outer casing of the pump, and the lubrication structure comprises:

[0032] A second sealing cylinder, fixed on a side surface of the mounting seat;

[0033] a second sliding plug, sealingly and slidingly connected to the inner surface of the second sealing cylinder, wherein lubricating oil is accumulated between the second sliding plug and the second sealing cylinder;

[0034] A pull rod, one end of which is fixedly connected to the second sliding plug, and the other end of which passes through the second sealing cylinder, wherein the pull rod is slidably connected to the second sealing cylinder;

[0035] a second spring, one end of which is connected to the second sealing cylinder, and the other end of which is connected to the second sliding plug;

[0036] An annular tube is fixed inside the pump outer shell, the annular tube is arranged opposite to the dynamic sealing ring, and the annular tube is connected to the second sealing cylinder through a connecting tube;

[0037] A plurality of spray holes are arranged on the annular tube.

[0038] As a preferred technical solution of the present invention, each of the spray holes is arranged toward the dynamic sealing ring, and a plurality of the spray holes are evenly distributed on the annular tube.

[0039] As a preferred technical solution of the present invention, the annular tube and the dynamic sealing ring do not contact each other.

[0040] As a preferred technical solution of the present invention, the mounting ring is connected to the dynamic sealing seat through a connecting structure, and the connecting structure includes:

[0041] An annular groove is provided on the inner surface of the dynamic seal seat;

[0042] A first clamping groove is provided on the inner surface of the dynamic sealing seat and is connected to the annular groove, and an opening is formed between the top end of the first clamping groove and the end surface of the dynamic sealing seat;

[0043] A second clamping groove is provided on the inner surface of the dynamic sealing seat and is connected with the annular groove;

[0044] The clamping block is fixed on the outer peripheral surface of the mounting ring.

[0045] As a preferred technical solution of the present invention, the side surface of the card block and the slot wall of the second card slot are in contact with each other.

[0046] As a preferred technical solution of the present invention, the outer surface of the mounting ring and the inner surface of the dynamic sealing seat are in contact with each other.

[0047] The present invention has the following beneficial effects:

[0048] 1. By setting up a dynamic sealing structure, after the pump body stops working, a series of mechanical operations are performed to separate the dynamic sealing ring and the static sealing ring, which is convenient for thorough flushing and cleaning of both. Secondly, by passing water to specific parts, the flow of water can effectively remove impurities attached to the dynamic sealing ring and the static sealing ring, thereby avoiding the wear of these impurities on the sealing ring and extending the service life of the sealing ring. Finally, after the cleaning is completed, the normal working state of the pump body can be restored through reverse operation. The entire cleaning process is simple and efficient, and there is no need to disassemble the mechanical sealing structure, which greatly reduces the maintenance cost and workload;

[0049] 2. First, the hollow structure of the dynamic seal ring and its coordinated use with the inflatable structure ensure that the dynamic seal ring always presses the static seal seat under the action of air pressure, thereby ensuring the mechanical sealing effect between the dynamic seal ring and the static seal ring, and improving the reliability and stability of the seal. Secondly, when the dynamic seal ring is corroded or damaged, the gas leakage phenomenon can be detected in time. Specifically, the gas leakage will cause the second spring to push the first sliding plug to move. By observing the position of the first sliding plug, the staff can quickly determine whether the dynamic seal ring is damaged. This design greatly improves the efficiency and accuracy of fault detection. In addition, the setting of the first observation window on the first sealing cylinder and the second observation window on the pump body, as well as the colored ribbon on the first sliding plug and the application of the visual retention principle, enable the staff to judge the position of the first sliding plug more intuitively and accurately, so as to find the damage of the dynamic seal ring in time;

[0050] 3. The connection structure realizes the rapid disassembly and assembly of the mounting ring, thereby greatly simplifying the replacement process of the dynamic seal ring. The staff only needs to align, snap in, rotate and other steps to quickly complete the installation of the dynamic seal ring, without complicated tools or cumbersome steps, which greatly improves the work efficiency. Secondly, the design of the connection structure takes into account the convenience and stability during the installation process. The cooperation between the clamping block and the first clamping groove, the annular groove and the second clamping groove not only ensures that the mounting ring can be accurately and firmly installed on the dynamic seal seat, but also through the elastic force of the first spring, the clamping block can automatically snap into the second clamping groove. Finally, the connection structure also ensures close contact and good sealing between the dynamic seal ring and the static seal ring. During the installation process, as the clamping block moves and rotates, the dynamic seal ring will gradually approach and press the static seal ring, thereby ensuring the mechanical sealing effect between the two.

[0051] 4. After cleaning the dynamic seal ring and the static seal ring, the lubricating oil in the second sealing cylinder can be evenly pushed into the annular tube by pushing the pull rod, and sprayed onto the surface of the dynamic seal ring and the static seal ring through the spray hole. This process not only ensures the accurate application of the lubricating oil, but also provides the necessary lubrication for the contact surface of the dynamic seal ring and the static seal ring. When the electromagnet is powered off, the mounting ring and the dynamic seal ring will be reset under the elastic force of the first spring, and the dynamic seal ring will press the static seal ring again. At this time, the lubricating oil attached to the contact surface of the two can quickly form a sealing oil film. The existence of this oil film brings two major benefits: first, it significantly reduces the friction loss between the dynamic seal ring and the static seal ring, and extends the service life of the seal ring; second, it improves the sealing performance of the contact surface of the two, and enhances the overall sealing effect of the mechanical seal structure for the pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 This is a schematic diagram of the planar structure of a pump bearing mechanical seal structure proposed by the present invention;

[0053] Figure 2 This is a schematic diagram of the exploded structure of a pump bearing mechanical seal structure proposed by the present invention;

[0054] Figure 3 This is a schematic diagram of an exploded structure of a pump bearing mechanical seal structure proposed by the present invention from another perspective;

[0055] Figure 4 for Figure 2 A magnified view of the structure at A;

[0056] Figure 5 for Figure 3 A magnified view of the structure at B;

[0057] Figure 6 It is a structural schematic diagram of the lubrication structure;

[0058] Figure 7 is a schematic diagram of the structure of the inflatable structure;

[0059] Figure 8 A schematic diagram of the connection structure.

[0060] In the figure: 1 pump outer shell, 2 dynamic shaft, 3 mounting seat, 4 static sealing seat, 5 static sealing ring, 61 dynamic sealing seat, 62 mounting ring, 63 dynamic sealing ring, 64 first spring, 7 mounting bracket, 8 electromagnet, 91 first sealing cylinder, 92 first sliding plug, 93 second spring, 94 first observation window, 95 second observation window, 101 annular groove, 102 first clamping groove, 103 second clamping groove, 104 clamping block, 111 second sealing cylinder, 112 second sliding plug, 113 pull rod, 114 second spring, 115 annular tube, 116 spray hole, 12 ball seat, 13 valve stem. DETAILED DESCRIPTION

[0061] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0062] Reference Figure 1-8 A mechanical seal structure for a pump bearing comprises a pump outer shell 1; a moving shaft 2, rotatably mounted inside the pump outer shell 1; a mounting seat 3, fixed inside the pump outer shell 1; a static sealing seat 4, fixed inside the pump outer shell 1; a static sealing ring 5, arranged on the static sealing seat 4; a mounting bracket 7, fixed inside the pump outer shell 1; an electromagnet 8, mounted on the mounting bracket 7; a ball seat 12, rotatably mounted in the mounting seat 3, and a flow channel is opened on the ball seat 12; a valve stem 13, the valve stem 13 passes through the pump outer shell 1 and the mounting seat 3, the pump outer shell 1 and the mounting seat 3 are both rotatably connected to the valve stem 13, and one end of the valve stem 13 is fixedly connected to the ball seat 12;

[0063] The mechanical seal structure also includes a dynamic seal structure, which is arranged inside the pump outer shell 1. The dynamic seal structure cooperates with the static seal ring 5 to form a mechanical seal. The dynamic seal structure includes: a dynamic seal seat 61, which is slidably arranged on the inner surface of the pump outer shell 1; a mounting ring 62, which is mounted on the dynamic seal seat 61, and the mounting ring 62 is made of magnetic material. The outer surface of the mounting ring 62 and the inner surface of the dynamic seal seat 61 fit each other; a dynamic seal ring 63, which is fixed on the mounting ring 62 and is arranged opposite to the static seal seat 4; a plurality of first springs 64, one end of which is connected to the dynamic seal seat 61, and the other end of which is connected to the mounting ring 62. When cleaning, the staff first controls the pump body to stop working, and then rotates the valve stem 13, the valve stem 1 3 can drive the ball seat 12 to rotate until the ball seat 12 rotates 90°, so that the flow channel on the ball seat 12 is perpendicular to the moving shaft 2. At this time, the liquid cannot flow through the ball seat 12. Further, the staff energizes the electromagnet 8. When the electromagnet 8 is energized, it can generate magnetism and attract the mounting ring 62 made of magnetic material, so that the mounting ring 62 moves toward the direction close to the electromagnet 8. When the mounting ring 62 moves, it can drive the dynamic seal ring 63 to move, so that the dynamic seal ring 63 and the static seal ring 5 are separated from each other. Then, the staff passes water into the interior of the pump outer shell 1. When the water flows into the interior of the pump outer shell 1, the flow of the water can cause impurities to fall off the dynamic seal ring 63 and the static seal ring 5, so as to flush and clean the dynamic seal ring 63 and the static seal ring 5.

[0064] The dynamic seal ring 63 is a hollow structure, and an inflatable structure is arranged on the dynamic shaft 2, and the inflatable structure comprises: a first sealing cylinder 91, fixed on the dynamic shaft 2, the first sealing cylinder 91 being connected to the dynamic seal ring 63 through a hose; a first sliding plug 92, sealingly and slidingly connected to the inner surface of the first sealing cylinder 91, and a color ribbon is arranged on the first sliding plug 92; a second spring 93, one end of which is connected to the first sealing cylinder 91, and the other end is connected to the first sliding plug 92; a first observation window 94, which is provided on the first sealing cylinder 91; a second observation window 95, which is provided on the pump outer shell 1 and is arranged opposite to the first observation window 94. Under the elastic force of the second spring 93, the first sliding plug 92 always has a tendency to push gas into the dynamic seal ring 63, so that the dynamic seal ring 63 is always in an inflated state. Under the action of air pressure, the dynamic seal ring 63 can press the static seal seat 5, thereby ensuring the mechanical connection between the dynamic seal ring 63 and the static seal ring 5. Sealing effect. In addition, when the dynamic seal ring 63 is corroded and damaged, the gas will leak out. When the gas leaks from the inside of the dynamic seal ring 63, the second spring 93 can push the first sliding plug 92 to move. Therefore, the staff can judge whether the dynamic seal ring 63 is damaged by observing the position of the first sliding plug 92. A first observation window 94 is provided on the first sealing cylinder 91, and a second observation window 95 is provided on the pump outer shell 1, and the second observation window 95 is arranged opposite to the first observation window 94. The staff can judge the position of the first sliding plug 92 through the first observation window 94 and the second observation window 95. Secondly, a colored ribbon is provided on the first sliding plug 92. When the dynamic shaft 2 rotates, the first sliding plug 92 will rotate accordingly. According to the principle of visual persistence, the colored ribbon on the first sliding plug 92 can form a colored ring. The existence of the colored ring is conducive to the staff to accurately judge the position of the first sliding plug 92, so that the staff can find the damage of the dynamic seal ring 63 even if the staff finds it.

[0065] The pump outer shell 1 is provided with a lubrication structure inside, and the lubrication structure includes: a second sealing cylinder 111, fixed to the side of the mounting seat 3; a second sliding plug 112, sealingly and slidingly connected to the inner surface of the second sealing cylinder 111, and lubricating oil is accumulated between the second sliding plug 112 and the second sealing cylinder 111; a pull rod 113, one end of which is fixedly connected to the second sliding plug 112, and the other end passes through the second sealing cylinder 111, and the pull rod 113 is slidably connected to the second sealing cylinder 111; a second spring 114, one end of which is connected to the second sealing cylinder 111, and the other end of which is connected to the second sliding plug 112; an annular tube 115, fixed inside the pump outer shell 1, the annular tube 115 is arranged opposite to the dynamic sealing ring 63, the annular tube 115 and the second sealing cylinder 111 are connected through a connecting tube, and the annular tube 115 and the dynamic sealing ring 63 do not contact each other; a plurality of spray holes 116, all of which are arranged on the annular tube 115, and each of the spray holes 116 is arranged toward the dynamic sealing ring 63, The plurality of spray holes 116 are evenly distributed on the annular tube 115. After cleaning the dynamic seal ring 63 and the static seal ring 5, the staff keeps the dynamic seal ring 63 and the static seal ring 5 separated and pushes the pull rod 113 so that the pull rod 113 drives the second sliding plug 112 to move. When the second sliding plug 112 moves, the lubricating oil in the second sealing cylinder 111 can be pushed into the interior of the annular tube 115, so that the lubricating oil flows out through the plurality of spray holes 116, so that the lubricating oil can flow to the dynamic seal ring 63 and the static seal ring 5, and the second sliding plug 112 can be pushed into the annular tube 115. Next, the staff controls the electromagnet 8 to cut off the power. When the electromagnet 8 is cut off, the mounting ring 62 and the dynamic seal ring 63 will be reset under the elastic force of the first springs 64 until the dynamic seal ring 63 presses the static seal ring 5. In this case, the lubricating oil attached to the dynamic seal ring 63 and the static seal ring 5 can form a sealing oil film. The existence of the oil film can reduce the friction loss between the dynamic seal ring 63 and the static seal ring 5, and can also improve the sealing performance of the contact surface between the dynamic seal ring 63 and the static seal ring 5.

[0066] The mounting ring 62 is connected to the dynamic sealing seat 61 through a connecting structure, and the connecting structure includes: an annular groove 101, which is provided on the inner surface of the dynamic sealing seat 61; a first clamping groove 102, which is provided on the inner surface of the dynamic sealing seat 61 and communicated with the annular groove 101, and an opening is formed between the top of the first clamping groove 102 and the end surface of the dynamic sealing seat 61; a second clamping groove 103, which is provided on the inner surface of the dynamic sealing seat 61 and communicated with the annular groove 101; a clamping block 104, which is fixed on the outer peripheral surface of the mounting ring 62, and the side surface of the clamping block 104 and the groove wall of the second clamping groove 103 are in contact with each other.

[0067] The specific working principle of the present invention is as follows:

[0068] The mechanical seal structure for a pump proposed in the present invention has the function of cleaning the static seal ring 5 and the dynamic seal ring 63. When performing the cleaning work, the staff first controls the pump body to stop working, and then rotates the valve stem 13. When the valve stem 13 rotates, it can drive the ball seat 12 to rotate until the ball seat 12 rotates 90°, so that the flow channel on the ball seat 12 is perpendicular to the dynamic shaft 2. At this time, the liquid cannot flow through the ball seat 12. Further, the staff energizes the electromagnet 8. When the electromagnet 8 is energized, it can generate magnetism and attract the mounting ring 62 made of magnetic material, so that the mounting ring 62 moves in the direction close to the electromagnet 8. When the mounting ring 62 moves, it can drive the dynamic seal ring 63 to move, so that the dynamic seal ring 63 and the static seal ring 5 are separated from each other. Then, the staff passes water into the interior of the pump outer shell 1. When the water flows into the interior of the pump outer shell 1, the flow of water can make impurities The impurities in the water flow will also flow out from the inside of the pump housing 1, and the dynamic seal ring 63 and the static seal ring 5 can be cleaned, and the impurities in the water flow will be avoided from causing wear to the dynamic seal ring 63 and the static seal ring 5, and the mechanical sealing effect of the dynamic seal ring 63 and the static seal ring 5 can be ensured. It is worth noting that the electromagnet 8 is waterproofed to prevent the liquid in the pump housing 1 from affecting the normal operation of the electromagnet 8.

[0069] Furthermore, the dynamic seal ring 63 is a hollow structure, and the dynamic shaft 2 is provided with an inflatable structure used in conjunction with the dynamic seal ring 63. Specifically, under the elastic force of the second spring 93, the first sliding plug 92 always has a tendency to push the gas into the dynamic seal ring 63, so that the dynamic seal ring 63 is always in an inflated and expanded state. Under the action of air pressure, the dynamic seal ring 63 can press the static seal seat 5, thereby ensuring the mechanical sealing effect of the dynamic seal ring 63 and the static seal ring 5. In addition, when the dynamic seal ring 63 is corroded and damaged, the gas will leak out. When the gas leaks from the inside of the dynamic seal ring 63, the second spring 93 can push the first sliding plug 92 to move. Therefore, the staff can observe the first The position of the sliding plug 92 can be used to judge whether the dynamic sealing ring 63 is damaged. A first observation window 94 is provided on the first sealing cylinder 91, and a second observation window 95 is provided on the pump outer shell 1, and the second observation window 95 is arranged opposite to the first observation window 94. The staff can judge the position of the first sliding plug 92 through the first observation window 94 and the second observation window 95. Secondly, a colored ribbon is provided on the first sliding plug 92. When the dynamic shaft 2 rotates, the first sliding plug 92 will rotate accordingly. According to the principle of visual persistence, the colored ribbon on the first sliding plug 92 can form a colored ring. The existence of the colored ring is conducive to the staff to accurately judge the position of the first sliding plug 92, so that the staff can find the damage of the dynamic sealing ring 63 even if the staff finds it.

[0070] The dynamic seal ring 63 is arranged on the mounting ring 62, and the mounting ring 62 is connected to the dynamic seal seat 61 through a connecting structure. The setting of the connecting structure realizes the rapid disassembly and assembly of the mounting ring 62, which is convenient for the staff to replace the dynamic seal ring 63. Specifically, when installing the dynamic seal ring 63, the staff first aligns the clamping block 104 on the mounting ring 62 with the first clamping groove 102, and clamps the mounting ring 62 into the dynamic seal seat 61. In this process, the clamping block 104 will slide in the first clamping groove 102. In addition, the mounting ring 62 can also align several first clamping grooves 102 when moving. When the block 104 moves to the position where the first slot 102 is connected to the annular slot 101, the block 104 and the mounting ring 62 cannot move further. At this time, the staff can rotate the mounting ring 62 to make the mounting ring 62 drive the block 104 to rotate. The block 104 can slide in the annular slot 101 when rotating. When the block 104 moves to the position facing the second slot 103, the block 104 will move upward under the elastic force of the first springs 64 and be stuck in the second slot 103. , the block 104 will slide in the second slot 103, and the dynamic seal ring 63 will also approach the static seal ring 5 until the dynamic seal ring 63 presses the static seal ring 5, so that the dynamic seal ring 63 can be quickly installed. When the dynamic seal ring 63 is installed in place, under the elastic force of the first springs 64, the dynamic seal ring 63 can press the static seal ring 5 to achieve mechanical sealing. When the dynamic seal ring 63 needs to be removed, the staff first presses the installation ring 62 to retract the installation ring 62 into the interior of the dynamic seal seat 61. In this process, the block 104 will When the block 104 moves to the position where the second slot 103 is connected to the annular slot 101, the block 104 and the mounting ring 62 cannot move further. At this time, the staff rotates the mounting ring 62 in the opposite direction to move the block 104 in the annular slot 101. When the block 104 moves to the position facing the first slot 102, the block 104 can slide into the first slot 102. At this time, the mounting ring 62 pops out from the dynamic seal seat 61 under the elastic force of the first springs 64, thereby realizing the rapid disassembly of the dynamic seal ring 63.

[0071] The pump outer shell 1 is also provided with a lubricating structure for lubricating the dynamic seal ring 63 and the static seal ring 5. After cleaning the dynamic seal ring 63 and the static seal ring 5, the staff keeps the dynamic seal ring 63 and the static seal ring 5 separated and pushes the pull rod 113 so that the pull rod 113 drives the second sliding plug 112 to move. When the second sliding plug 112 moves, it can push the lubricating oil in the second sealing cylinder 111 into the inside of the annular tube 115, so that the lubricating oil flows out through a plurality of spray holes 116, so that the lubricating oil can flow to the dynamic seal ring 63 and the static seal ring 5. The sealing ring 5 is then controlled by the staff to cut off the power of the electromagnet 8. When the electromagnet 8 is powered off, the mounting ring 62 and the dynamic sealing ring 63 are reset under the elastic force of the first springs 64 until the dynamic sealing ring 63 presses the static sealing ring 5. In this case, the lubricating oil attached to the dynamic sealing ring 63 and the static sealing ring 5 can form a sealing oil film. The existence of the oil film can reduce the friction loss between the dynamic sealing ring 63 and the static sealing ring 5, and can also improve the sealing performance of the contact surface between the dynamic sealing ring 63 and the static sealing ring 5.

[0072] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A mechanical seal structure for a pump bearing, characterized in that: include: Pump outer casing (1); A moving shaft (2) is rotatably mounted inside the pump outer shell (1); A mounting seat (3) fixed inside the pump outer shell (1); A static sealing seat (4) fixed inside the pump outer shell (1); A static sealing ring (5), arranged on the static sealing seat (4); A dynamic sealing structure is arranged inside the pump outer shell (1), and the dynamic sealing structure cooperates with a static sealing ring (5) to form a mechanical seal; A mounting bracket (7) fixed inside the pump outer shell (1); An electromagnet (8) mounted on the mounting bracket (7); A ball seat (12) is rotatably mounted in the mounting seat (3), and a circulation channel is provided on the ball seat (12); A valve stem (13), the valve stem (13) passes through the pump outer shell (1) and the mounting seat (3), the pump outer shell (1) and the mounting seat (3) are both rotatably connected to the valve stem (13), and one end of the valve stem (13) is fixedly connected to the ball seat (12).

2. A pump bearing mechanical seal structure according to claim 1, characterized in that: The dynamic sealing structure comprises: A dynamic sealing seat (61) is slidably arranged on the inner surface of the pump outer shell (1); A mounting ring (62) mounted on the dynamic sealing seat (61), wherein the mounting ring (62) is made of a magnetic material; A dynamic sealing ring (63) is fixed on the mounting ring (62) and is arranged facing the static sealing seat (4); A plurality of first springs (64) are connected at one end to the dynamic sealing seat (61) and at the other end to the mounting ring (62).

3. A pump bearing mechanical seal structure according to claim 2, characterized in that: The dynamic sealing ring (63) is a hollow structure, and an inflatable structure is provided on the dynamic shaft (2), wherein the inflatable structure comprises: A first sealing cylinder (91) is fixed on the dynamic shaft (2), and the first sealing cylinder (91) is connected to the dynamic sealing ring (63) through a hose; A first sliding plug (92) is sealingly and slidably connected to the inner surface of the first sealing cylinder (91); A second spring (93), one end of which is connected to the first sealing cylinder (91), and the other end of which is connected to the first sliding plug (92); A first observation window (94) is provided on the first sealing cylinder (91); The second observation window (95) is provided on the pump outer shell (1) and is arranged opposite to the first observation window (94).

4. A pump bearing mechanical seal structure according to claim 3, characterized in that: The first slide plug (92) is provided with a color ribbon.

5. A pump bearing mechanical seal structure according to claim 1, characterized in that: A lubrication structure is provided inside the pump outer shell (1), and the lubrication structure comprises: A second sealing cylinder (111) fixed on a side surface of the mounting seat (3); A second sliding plug (112) is sealingly and slidably connected to the inner surface of the second sealing cylinder (111), and lubricating oil is accumulated between the second sliding plug (112) and the second sealing cylinder (111); A pull rod (113), one end of which is fixedly connected to the second sliding plug (112), and the other end of which passes through the second sealing cylinder (111), and the pull rod (113) is slidably connected to the second sealing cylinder (111); A second spring (114), one end of which is connected to the second sealing cylinder (111), and the other end of which is connected to the second sliding plug (112); An annular tube (115) is fixed inside the pump outer shell (1), the annular tube (115) is arranged opposite to the dynamic sealing ring (63), and the annular tube (115) is connected to the second sealing cylinder (111) through a connecting tube; A plurality of spray holes (116) are provided on the annular tube (115).

6. A pump bearing mechanical seal structure according to claim 5, characterized in that: Each of the spray holes (116) is arranged toward the dynamic sealing ring (63), and a plurality of the spray holes (116) are evenly distributed on the annular tube (115).

7. A pump bearing mechanical seal structure according to claim 5, characterized in that: The annular tube (115) and the dynamic sealing ring (63) do not contact each other.

8. A pump bearing mechanical seal structure according to claim 2, characterized in that: The mounting ring (62) is connected to the dynamic sealing seat (61) via a connecting structure, wherein the connecting structure comprises: An annular groove (101) is formed on the inner surface of the dynamic sealing seat (61); A first clamping groove (102) is provided on the inner surface of the dynamic sealing seat (61) and is connected to the annular groove (101), and an opening is formed between the top end of the first clamping groove (102) and the end surface of the dynamic sealing seat (61); A second clamping groove (103) is provided on the inner surface of the dynamic sealing seat (61) and is connected to the annular groove (101); The clamping block (104) is fixed on the outer peripheral surface of the mounting ring (62).

9. A pump bearing mechanical seal structure according to claim 1, characterized in that: The side surface of the clamping block (104) and the groove wall of the second clamping groove (103) are in contact with each other.

10. A pump bearing mechanical seal structure according to claim 2, characterized in that: The outer surface of the mounting ring (62) and the inner surface of the dynamic sealing seat (61) are in contact with each other.

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