Mechanical sealing structure and compressor
By using magnetic force as the source of preload for the moving ring in the mechanical sealing structure, the problem of preload reduction caused by wear is solved, and a more stable sealing performance and a longer service life are achieved.
Patent Information
- Application Number
- CN202421248871.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-03
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2034-06-03
AI Technical Summary
The mechanical sealed dynamic ring and static ring will decrease due to wear after a long period of operation, which will increase the risk of leakage, and the reduction in elastic force of the preload spring cannot be effectively compensated.
Magnetic force is used as the source of preload for the moving ring. Through the interaction between the magnetic field of the magnetic part and the magnetic part, the moving ring and the static ring are kept in close contact to avoid the reduction of preload caused by wear.
The preloading force of the moving ring is achieved under wear, reducing the risk of leakage, and compensating for the loss of preload due to elongation by combining with the preloading spring.
Smart Images
Figure CN222687311U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of shaft sealing, in particular to a mechanical sealing structure and a compressor. Background Art
[0002] A mechanical seal is a device that is perpendicular to the end face of a rotating shaft and keeps the end face in close contact and slides relative to each other under the cooperation of elastic force or other forces to prevent fluid leakage. Mechanical seals are usually composed of components such as static rings and dynamic rings. To ensure the sealing performance of a mechanical seal, the dynamic ring and the static ring of the mechanical seal need to fit tightly to prevent leakage of the medium. Therefore, compensation components such as dynamic ring preload springs are usually used to achieve a tight fit between the dynamic ring and the static ring of the mechanical seal; however, after long-term operation, the dynamic ring and the static ring of the mechanical seal will be worn (usually the softer dynamic ring of the mechanical seal will wear more obviously). As the compression amount of the compensation components represented by the spring decreases, the elastic force decreases, resulting in increased leakage or even complete failure of the seal. Utility Model Content
[0003] In order to solve the problem of decreased preload force of the dynamic ring due to wear, the utility model proposes a mechanical seal structure, which uses magnetic force to provide preload force for the dynamic ring so that the preload force does not decrease with the wear of the dynamic ring, and further proposes a compressor applied to the mechanical seal structure.
[0004] The technical solution adopted by the utility model is to design a mechanical sealing structure, including a static ring, a dynamic ring, and also including a magnetic piece fixed relative to the static ring and a magnetic dynamic piece arranged on the dynamic ring. The magnetic piece and the magnetic dynamic piece interact with each other through a magnetic field so that the dynamic ring and the static ring are close to each other.
[0005] In some embodiments, the magnetic member is a magnet, and the magnetic moving member is a ferromagnetic object.
[0006] In some embodiments, the magnetic member is a coaxial electromagnetic coil sleeved outside the dynamic ring.
[0007] In some embodiments, the magnetic moving part is a ring body coaxially connected to the moving ring, and the ring body is offset from the center of the electromagnetic coil relative to the static ring.
[0008] In some embodiments, it also includes a permanent magnet fixedly disposed relative to the dynamic ring, and a magnetic induction coil fixedly disposed relative to the static ring corresponding to the magnet, the magnetic induction coil is electrically connected to the electromagnetic coil, and the conductor direction of the magnetic induction coil is perpendicular to the magnetic field direction of the permanent magnet.
[0009] In some embodiments, the moving ring is slidably arranged in the telescopic cavity, a preload spring is arranged between the telescopic cavity and the moving ring, two sliders are arranged between the preload spring and the moving ring, the two sliders and the cavity wall of the telescopic cavity form a closed space, and the closed space is filled with magnetorheological fluid.
[0010] In some embodiments, the magnetic member is an electromagnet.
[0011] In some embodiments, the magnetic member and the magnetic moving member are both magnets.
[0012] In some embodiments, a coaxial transition ring is provided between the moving ring and the stationary ring, the transition ring has several closed coils evenly distributed circumferentially, the stationary ring has several magnetic parts evenly distributed circumferentially, and the moving ring has several magnetic moving parts evenly distributed circumferentially.
[0013] A compressor comprises the mechanical sealing structure.
[0014] Compared with the prior art, the utility model has the following beneficial effects:
[0015] In the utility model, since the pre-tightening force that keeps the moving ring toward the static ring is a magnetic force, the magnetic force can be in an attractive manner rather than a pushing manner like a spring, and therefore will not be reduced due to the movement of the moving ring. On the contrary, since the movement of the moving ring makes the distance between the magnetic part and the magnetic moving part closer, the magnetic attraction force can be made greater, thereby making the pre-tightening force greater. If used in conjunction with a pre-tightening spring, the loss of pre-tightening force caused by the elongation of the pre-tightening spring can be compensated. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The utility model is described in detail below in conjunction with specific embodiments and drawings. In order to show details and facilitate understanding of its principles, it is not necessarily drawn to scale, and similar reference numerals may describe similar components in different views. The drawings generally illustrate the embodiments discussed herein by way of example and not limitation. Among them:
[0017] Figure 1 It is a schematic diagram of embodiment 1.
[0018] Figure 2 yes Figure 1 A magnified schematic diagram of center A.
[0019] Figure 3 It is a schematic diagram of the second embodiment.
[0020] Figure 4 It is a schematic diagram of embodiment 3.
[0021] Figure 5 It is a schematic diagram of Embodiment 4.
[0022] Figure 6 It is a schematic diagram of the distribution of magnets on the moving ring of the fourth embodiment.
[0023] Figure 7 It is a schematic diagram of the distribution of closed coils on the transition ring of the fourth embodiment.
[0024] Figure 8 It is a schematic diagram of Embodiment 5.
[0025] In the figure, 1, static ring; 2, dynamic ring; 3, magnetic part; 4, magnetic dynamic part; 5, preload spring; 6, electromagnetic coil; 7, ring body; 8, slider; 9, magnetorheological fluid; 10, transition ring; 11, closed coil; 12, input shaft; 13, pressure-resistant shell; 14, rotating permanent magnet; 15, magnetic induction coil. DETAILED DESCRIPTION
[0026] The following are specific embodiments of the present invention, and the technical solution of the present invention is further described in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments, and the following embodiments do not limit the utility model involved in the claims. In addition, all combinations of the features described in the embodiments are not necessarily required for the solution of the utility model.
[0027] The principle and structure of the present utility model are described in detail below with reference to the accompanying drawings and embodiments.
[0028] Embodiment 1
[0029] In order to ensure adequate sealing performance, the mechanical seal needs to have a tight fit between the dynamic ring and the static ring of the mechanical seal to prevent leakage of the medium. Therefore, compensation components such as dynamic ring preload springs are usually used to achieve a tight fit between the dynamic ring and the static ring of the mechanical seal. However, after long-term operation, the dynamic ring and the static ring of the mechanical seal will be worn (usually the softer dynamic ring of the mechanical seal will wear more obviously). As the compression amount decreases, the elastic force of the compensation components represented by the spring decreases, resulting in increased leakage or even complete failure of the seal. Moreover, when the dynamic ring of the mechanical seal is not worn much, the preload force provided by the spring to the dynamic ring of the mechanical seal is unevenly distributed. Therefore, it is necessary to design a structure that has little effect on the force acting on the dynamic ring of the mechanical seal when the dynamic ring of the mechanical seal is worn.
[0030] For this reason, Figure 1 , 2As shown, a mechanical sealing structure is provided, including a static ring 1, a dynamic ring 2, and also including a magnetic part 3 fixed relative to the static ring 1 and a dynamic magnetic part 4 arranged on the dynamic ring 2. The magnetic part 3 and the dynamic magnetic part 4 interact with each other through the magnetic field to make the dynamic ring 2 and the static ring 1 approach each other, thereby making the dynamic ring 2 and the static ring 1 remain close, that is, the dynamic ring 2 has a pre-tightening force toward the static ring 1.
[0031] The beneficial effect of such a configuration is that since the preload force that keeps the moving ring 2 toward the static ring 1 is a magnetic force, the magnetic force can be in an attractive manner rather than a pushing manner like a spring, so it will not be reduced due to the movement of the moving ring 2. On the contrary, since the movement of the moving ring 2 makes the distance between the magnetic part 3 and the magnetic moving part 4 closer, the magnetic attraction force can be made greater, thereby making the preload force greater. If used in conjunction with a preload spring, the loss of preload force caused by the elongation of the preload spring can be compensated.
[0032] The magnetic member 3 is a magnet, and the magnetic moving member 4 is a ferromagnetic object, that is, the magnetic member 3 is a magnet that can generate a magnetic field, and the magnetic moving member 4 is a ferromagnetic object that can be attracted by a magnet, such as an iron block.
[0033] The beneficial effect of such a setting is that since only a magnet and an iron block need to be provided, the structure is simple and the installation is convenient. This can be simply achieved by embedding the permanent magnet into the stationary ring 1 and the iron block into the dynamic ring 2, without affecting the traditional structure of the mechanical seal, and the preload spring 5 can still be retained. As the dynamic ring 2 is worn so that the distance between the permanent magnet and the iron block becomes closer, the magnetic attraction of the permanent magnet to the iron block becomes larger, thereby increasing the preload force, thereby supplementing the elastic force of the preload spring 5.
[0034] The magnetic member 3 may be an electromagnet.
[0035] The beneficial effect of such a configuration is that the magnitude of the magnetic field force of the electromagnet can be controlled by passing electricity, thereby controlling the magnitude of the force acting on the magnetic moving part 4, that is, the magnitude of the pre-tightening force of the moving ring 2 can be adjusted as needed.
[0036] Embodiment 2
[0037] like Figure 3 As shown, different from the above-mentioned embodiment, the magnetic part 3 is a coaxial electromagnetic coil 6 sleeved outside the moving ring 2. When the electromagnetic coil 6 is energized, a magnetic field along the axial direction of the moving ring 2 is generated. The magnetic field acts on the magnetic moving part 4, so that the magnetic moving part 4 moves toward the direction of the static ring 1, thereby providing a pre-tightening force for the moving ring 2 in the direction of the static ring 1.
[0038] The beneficial effect of such a configuration is that the magnetic force of the electromagnetic coil 6 is used to control the magnetic moving part 4. The magnitude of the current passing through the electromagnetic coil 6 can be controlled to control the magnitude of the magnetic field force generated by the electromagnetic coil 6, thereby controlling the magnitude of the force acting on the magnetic moving part 4, that is, the magnitude of the preload force of the moving ring 2 can be adjusted as needed.
[0039] Furthermore, the magnetic moving part 4 is a ring body 7 coaxially connected to the moving ring 2, and the ring body 7 is offset from the center of the electromagnetic coil 6 relative to the static ring 1, that is, the main part of the ring body 7 is located on one side of the center of the electromagnetic coil 6, and the static ring 1 is located on the other side of the center of the electromagnetic coil 6.
[0040] The beneficial effect of such a configuration is that since the main part of the ring body 7 is located on one side of the center of the electromagnetic coil 6, when the electromagnetic coil 6 generates a magnetic field along the axial direction of the ring body 7, the ring body 7 has a tendency to move toward the center of the electromagnetic coil 6, so that the ring body 7 has a pre-tightening force toward the static ring 1. Since the magnetic moving part 4 is a ring body 7 coaxially connected to the dynamic ring 2, the thrust force acting on various circumferential parts of the ring body 7 is relatively uniform.
[0041] Embodiment 3
[0042] like Figure 4 As shown, different from the above embodiment, the movable ring 2 is slidably arranged in the telescopic cavity, a preload spring 5 is arranged between the telescopic cavity and the movable ring 2, and two sliders 8 are arranged between the preload spring 5 and the movable ring 2. The two sliders 8 and the cavity wall of the telescopic cavity form a closed space, and the closed space is filled with magnetorheological fluid 9. The magnetic member 3 is a coaxial electromagnetic coil 6 sleeved outside the movable ring 2, and the electromagnetic coil 6 will generate a magnetic field along the axial direction of the movable ring 2 when energized.
[0043] Magnetorheological fluid is a special type of fluid whose viscosity can be adjusted in real time by changing the external magnetic field. This material is usually made of tiny magnetic particles suspended in a liquid medium. When an external magnetic field is applied to the magnetorheological fluid, the magnetic particles will rearrange, thus changing the flow properties of the liquid, causing its viscosity to increase or decrease.
[0044] Magnetorheological fluids can be used in damping systems to adjust the damping effect by changing their viscosity by adjusting the strength of the external magnetic field. In damping systems, magnetorheological fluids are usually placed in the cavity between the piston and the cylinder. When an external magnetic field is applied, the magnetic particles rearrange themselves, increasing the viscosity of the fluid, thereby increasing the damping effect and slowing down the movement of the piston. Conversely, when the external magnetic field is reduced, the viscosity of the magnetorheological fluid decreases, and the movement speed of the piston increases accordingly.
[0045] The beneficial effect of such a setting is that the magnetic field generated by the electromagnetic coil 6 can control the viscosity change of the magnetorheological fluid 9, that is, control the viscous resistance between the magnetorheological fluid 9 and the inside of the telescopic cavity. The larger the magnetic field, the greater the viscous resistance, and thus the greater the resistance to the sliding block 8 sliding in the telescopic cavity. In this way, the pre-tightening force of the pre-tightening spring 5 on the moving ring 2 can be controlled by controlling the resistance of the slider 8, that is, the pre-tightening force of the moving ring 2 on the static ring 1 can be adjusted by adjusting the magnetic field generated by the electromagnetic coil 6. In this way, a spring with a larger pre-tightening force can be set. When the moving ring 2 is not worn, the resistance of the magnetorheological fluid 9 is used to offset part of the elastic force of the spring so that the contact force between the moving ring 2 and the static ring 1 is not too large. When the moving ring 2 is worn, the spring stretches, causing the elastic force of the spring to decrease, and the resistance of the magnetorheological fluid 9 can be reduced, thereby ensuring that there is sufficient elastic force acting on the moving ring 2, thereby the pre-tightening force of the moving ring 2 on the static ring 1.
[0046] Embodiment 4
[0047] like Figure 5 , 6 As shown in FIG. 7 , different from the above-mentioned embodiments, the magnetic member 3 and the magnetic moving member 4 are both magnets, for example, both are permanent magnets, and the two permanent magnets attract each other, thereby providing a pre-tightening force for the moving ring 2 and the stationary ring 1.
[0048] The beneficial effect of such a setting is that since only permanent magnets need to be provided, the structure is simple and the installation is convenient. This can be simply achieved by embedding permanent magnets into the stationary ring 1 and the dynamic ring 2, without affecting the traditional structure of the mechanical seal, and the preload spring 5 can still be retained. As the dynamic ring 2 is worn so that the distance between the permanent magnet and the iron block becomes closer, the distance between the permanent magnets becomes larger, and then the attraction becomes larger, thereby increasing the preload force, which can supplement the elastic force of the preload spring 5.
[0049] A coaxial transition ring 10 is arranged between the moving ring 2 and the stationary ring 1 , and the transition ring 10 has several closed coils 11 evenly distributed circumferentially, the stationary ring 1 has several magnetic parts 3 evenly distributed circumferentially, and the moving ring 2 has several magnetic moving parts 4 evenly distributed circumferentially.
[0050] The beneficial effect of such a configuration is that when the closed coil 11 rotates relative to the magnet, the closed coil 11 cuts the magnetic lines of force of the magnet, and generates current in the closed coil 11. The current generates an induced magnetic field, and the induced magnetic field has a mutual attraction effect on the magnet. The greater the relative speed between the closed coil 11 and the magnet, the greater the attraction, and this force acts as a resistance to the rotation of the transition ring. Therefore, the speed of the transition ring 10 is lower than the speed of the moving ring 2, and the speed of the transition ring 10 relative to the static ring 1 is lower than the speed of the moving ring 2 relative to the static ring 1, thereby reducing the end face friction speed of the moving ring 2 and the static ring 1, which is beneficial to reducing friction.
[0051] The relative speed of the stationary ring 1 and the dynamic ring 2 of the compressor mechanical seal structure is one of the important factors affecting the wear of the mechanical seal. In the mechanical seal, there is a relative movement between the stationary ring 1 and the dynamic ring 2, and their relative speed determines the wear of the seal surface. When the relative speed of the stationary ring 1 and the dynamic ring 2 is low, the friction between the seal surfaces is relatively small. In this case, the wear is mainly affected by friction and the degree of wear is relatively light. However, even at a low relative speed, long-term operation will cause wear and fatigue, especially when the sealing medium has particles or solid impurities. When the relative speed of the stationary ring 1 and the dynamic ring 2 is high, the friction between the seal surfaces increases, resulting in increased wear. High-speed rotation will generate greater inertial and centrifugal forces, which aggravate the wear of the seal. In this case, wear may be faster and the life of the seal may be shorter. Therefore, the design and selection of the seal needs to take into account the relative speed under actual operating conditions. Generally, mechanical seals running at high speeds require additional measures to reduce wear.
[0052] Embodiment 5
[0053] like Figure 8 As shown, the compressor includes the mechanical seal structure. The dynamic ring 2 in the mechanical seal structure is assembled on the input shaft 12 of the screw compressor, and the static ring 1 in the mechanical seal is assembled on the mechanical seal cover plate or the pressure-resistant housing 13. When the input shaft 12 rotates, the dynamic ring 2 and the static ring 1 of the mechanical seal will form a friction pair to achieve the dynamic sealing function. At the same time, with the friction between the dynamic ring 2 and the static ring 1, the dynamic ring 2 gradually generates friction loss. At this time, the preload force will push the ring 2 to move forward, so as to ensure the effectiveness of the mechanical seal.
[0054] A permanent magnet is fixedly arranged relative to the moving ring 2, and a magnetic induction coil 15 is fixedly arranged relative to the stationary ring 1 corresponding to the magnet. The magnetic induction coil 15 is electrically connected to the electromagnetic coil 6, and the conductor direction of the magnetic induction coil 15 is perpendicular to the magnetic field direction of the permanent magnet.
[0055] In this embodiment, the rotating permanent magnet 14 is arranged on the input shaft 12 , and the magnetic induction coil 15 is arranged on the pressure-resistant shell 13 .
[0056] The beneficial effect of such a configuration is that when the input shaft 12 drives the permanent magnet to rotate relative to the magnetic induction coil 15, an induced current will be generated in the magnetic induction coil 15. The current passes through the electromagnetic coil 6, causing the electromagnetic coil 6 to generate a magnetic field that attracts the magnetic moving part 4. The greater the speed of the input shaft 12, the greater the current generated, the greater the magnetic field, and thus the greater the force on the magnetic moving part 4, thereby increasing the pre-tightening force of the moving ring 2 relative to the static ring 1, which is beneficial for providing greater sealing performance for the equipment at high speeds and meeting the needs of the equipment under large operating conditions.
[0057] When the moving ring is running at high speed, the end face of the moving ring or the static ring will produce certain wear due to relative friction. This wear is greatly affected by the relative linear velocity between the end faces. The greater the relative linear velocity of the two end faces, the faster the wear. In order to reduce wear, the mechanical seal strictly stipulates the linear velocity. However, when the diameter of the rotating shaft is large, the diameters of the static ring and the moving ring are also large, thereby making the linear velocity of the relative rotation of the static ring and the moving ring too large, exceeding the limit value of the allowable linear velocity. For this reason, the transition ring is provided between the moving ring and the static ring to separate the moving ring from the static ring, so that the linear velocity of the moving ring relative to the transition ring is less than the rotation speed of the input shaft, that is, less than the rotation speed of the moving ring relative to the static ring. Since the rotation speed of the transition ring is less than the rotation speed of the moving ring, the rotation speed of the transition ring relative to the static ring is also less than the rotation speed of the moving ring relative to the static ring, that is, without changing the rotation speed of the moving ring relative to the static ring, the end face relative velocity of the moving ring and the static ring is lower than the limit linear velocity allowed by the end face.
[0058] Fluid machinery such as compressors have an input shaft external to the sealed housing. The output shaft of an external drive device such as a motor transmits torque to the input shaft through a coupling to drive the shaft system of the compressor and other fluid machinery to rotate. Mechanical seals are used to achieve dynamic sealing of the relative motion position between the input shaft of the shaft system and the sealed housing.
[0059] Take screw compressor as an example:
[0060] The dynamic ring of the mechanical seal is fixed on the output shaft, and an O-ring is used to seal between the dynamic ring and the output shaft. There is no relative movement between the two, so it is a static seal; the static ring of the mechanical seal is fixed on the pressure-resistant housing, and an O-ring is used to seal between the static ring and the mechanical seal seat. There is no relative movement between the two, so it is a static seal; finally, the relative movement between the output shaft and the pressure-resistant housing occurs on the fitting surface of the dynamic ring and the static ring, that is, the dynamic ring and the static ring form a friction pair to realize the dynamic sealing function.
[0061] When the equipment is running, driven by the output shaft, the mechanical seal dynamic ring and the mechanical seal static ring form a friction pair to rub and generate a lot of heat. Therefore, a cooling oil circuit is opened, including mechanical seal oil supply and mechanical seal oil return. Considering the flow demand, the mechanical seal oil supply is a higher value to ensure sufficient oil flow. However, when the cooling oil enters the mechanical seal area, it is at a low pressure until it leaves the mechanical seal oil return. Taking the external oil station type as an example, the mechanical seal return oil directly returns to the external oil tank, and the pressure is consistent with the local atmospheric pressure.
[0062] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described, or replace them in similar ways, without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.
[0063] Although some terms are used more frequently in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model. The execution order of actions, steps, etc. in the devices and methods shown in the specification and the drawings can be implemented in any order as long as there is no special explicit limitation on the order and the output of the previous processing is not used in the subsequent processing. Similar sequential terms (for example, "first", "next", "secondly", "again", "then", etc.) used for the convenience of description do not mean that they must be implemented in such an order.
[0064] Those skilled in the art should understand that all directional references (for example, above, below, upward, up, downward, down, top, bottom, left, right, vertical, horizontal, etc.) are used descriptively in the drawings to facilitate the reader's understanding, and do not represent limitations (for example, on position, orientation or use, etc.) on the scope of the present invention as defined by the appended claims. They are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the referred device or element must have a specific orientation or be constructed and operated in a specific orientation. The directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.
[0065] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.
[0066] In addition, some vague terms (e.g., substantially, certain, generally, etc.) may refer to slight inaccuracies or slight deviations of conditions, quantities, values, or dimensions, some of which are within the manufacturing deviation or tolerance range. It should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meanings and therefore cannot be understood as limiting the scope of protection of this application.
Claims
1. A mechanical seal structure, including a stationary ring and a dynamic ring, characterized in that: It also includes a magnetic piece fixed relative to the static ring and a magnetic moving piece arranged on the dynamic ring, wherein the magnetic piece and the magnetic moving piece interact with each other through a magnetic field so that the dynamic ring and the static ring are close to each other; the magnetic piece is a magnet, and the magnetic moving piece is a ferromagnetic object; the magnetic piece is a coaxial electromagnetic coil sleeved outside the dynamic ring; the magnetic moving piece is a ring body coaxially connected to the dynamic ring, and the ring body deviates from the center of the electromagnetic coil relative to the static ring.
2. The mechanical seal structure according to claim 1, characterized in that: It also includes a permanent magnet fixedly arranged relative to the dynamic ring, and a magnetic induction coil fixedly arranged relative to the static ring corresponding to the magnet, the magnetic induction coil is electrically connected to the electromagnetic coil, and the conductor direction of the magnetic induction coil is perpendicular to the magnetic field direction of the permanent magnet.
3. The mechanical seal structure according to claim 1, characterized in that: The movable ring is slidably arranged in the telescopic cavity, a preload spring is arranged between the telescopic cavity and the movable ring, two sliders are arranged between the preload spring and the movable ring, the two sliders and the cavity wall of the telescopic cavity form a closed space, and the closed space is filled with magnetorheological fluid.
4. The mechanical seal structure according to claim 1, characterized in that: The magnetic member is an electromagnet.
5. The mechanical seal structure according to claim 1, characterized in that: The magnetic member and the magnetic moving member are both magnets.
6. The mechanical seal structure according to claim 5, characterized in that: A coaxial transition ring is arranged between the moving ring and the stationary ring, a plurality of closed coils are evenly distributed around the transition ring, a plurality of magnetic parts are evenly distributed around the stationary ring, and a plurality of magnetic moving parts are evenly distributed around the moving ring.
7. A compressor, characterized in that A mechanical seal structure according to any one of claims 1 to 6.