Dynamic sealing system of metal powder scattering equipment

Abstract

The utility model discloses a dynamic sealing system of metal powder scattering equipment, belongs to the technical field of sealing structures, and provides the dynamic sealing system of the metal powder scattering equipment, which is more stable in performance and comprises an inner shaft sleeve and an outer shaft sleeve which are arranged outside a transmission shaft in a sleeving manner, and the upper end of the inner shaft sleeve is fixedly connected with the lower end of the outer shaft sleeve; sealing rings are arranged at the lower end of the inner shaft sleeve and the upper end of the outer shaft sleeve and comprise circular truncated cone parts, the diameters of the opposite end faces of the two circular truncated cone parts are minimum, the outer side faces of the circular truncated cone parts are pressure-bearing faces, a lower cavity is formed in the inner shaft sleeve, the side wall of the inner shaft sleeve is provided with an air inlet end communicated with the lower cavity, and an upper cavity is formed in the outer shaft sleeve. The conical sealing ring structures are arranged at the two ends of the shaft sleeve, compression between the sealing rings and the transmission shaft is roughly stable under the pressure action of airflow, the situation that the sealing rings are abraded in an accelerated mode due to the fact that the sealing rings are too tight is avoided, and the situation that the airtight performance of the sealing rings is reduced due to the fact that the sealing rings are too loose is avoided. The sealing structure is better in durability and more stable in sealing performance.

Description

Technical Field

[0001] The present application relates to the technical field of sealing structures, and in particular to a dynamic sealing system for metal powder scattering equipment. Background Art

[0002] Since metal powder is more easily denatured when in contact with oxides, the breaking operation needs to be performed in a sealed environment. However, the driving mechanism for achieving the breaking action usually needs to be arranged outside the sealed housing, and the transmission rod needs to pass through the sealed housing to transmit power to the sealed housing. Since there is a matching gap between the transmission rod and the sealed housing, sealing is required. The traditional sealing method applies pre-pressure to the seal to make the seal fit tightly against the transmission shaft. As the seal wears, the pre-pressure will gradually decrease, and the sealing performance will also gradually decrease. It is difficult to judge to what extent the sealing performance has decreased, and it needs to be replaced regularly. Therefore, the conventional sealing structure has poor stability, high maintenance costs, and is not convenient to use. Summary of the invention

[0003] The purpose of the present application is to provide a dynamic sealing system for metal powder scattering equipment with more stable performance.

[0004] To achieve the above objectives, the present application provides a dynamic sealing system for a metal powder scattering device: it comprises an inner sleeve and an outer sleeve which are sleeved outside a transmission shaft, the upper end of the inner sleeve and the lower end of the outer sleeve being fixedly connected, the lower end of the inner sleeve and the upper end of the outer sleeve being both provided with a sealing ring, the sealing ring comprising a truncated cone portion, the two truncated cone portions having the smallest end diameters relative to each other, the outer side surface of the truncated cone portion being a pressure-bearing surface suitable for bearing air pressure, so that the inner wall of the truncated cone portion is tightly attached to the outer side surface of the transmission shaft, the inner sleeve has a lower cavity inside, the side wall of the inner sleeve has an intake end connected to the lower cavity, the outer sleeve has an upper cavity inside, the side wall of the outer sleeve has an exhaust end connected to the upper cavity, and air pressure sensors are provided in both the intake end and the exhaust end for accurately monitoring the air pressure changes between the sleeve and the transmission shaft.

[0005] As a preferred embodiment, the outer side surface of the end with a larger diameter of the frustum portion has a circular ring portion, and the inner wall of the end with a larger diameter of the frustum portion has a dust shield ring, which is also in the shape of a frustum, and the inner wall of the end of the dust shield ring away from the frustum portion is tightly attached to the outer side surface of the transmission shaft; the sealing ring is constrained by the end cover to the end surface of the inner sleeve or the outer sleeve, and the outer side surface of the end cover has a clamping edge, which is suitable for clamping with the lower end surface of the inner sleeve or the upper end surface of the outer sleeve to ensure the stability of the end cover.

[0006] As a preferred embodiment, the lower end surface of the inner sleeve is provided with a sinking groove, the inner top surface of the sinking groove is provided with a lower mating groove, the inner top surface of the lower mating groove is provided with a lower clamping groove, and the inner top surface of the lower clamping groove is provided with a lower configuration groove; the frustum portion is suitable for being embedded in the lower configuration groove, the annular portion is suitable for being embedded in the lower clamping groove, the end cover is suitable for being embedded in the lower mating groove, and the clamping edge is suitable for being embedded in the sinking groove, and the matching structure is compact and stable.

[0007] As a preferred embodiment, the upper end surface of the outer sleeve is provided with an upper sink groove, the inner bottom surface of the upper sink groove is provided with an upper mating groove, the inner bottom surface of the upper mating groove is provided with an upper clamping groove, and the inner bottom surface of the upper clamping groove is provided with an upper configuration groove; the frustum portion is suitable for being embedded in the upper configuration groove, the annular portion is suitable for being embedded in the upper clamping groove, the end cover is suitable for being embedded in the upper mating groove, and the clamping edge is suitable for being embedded in the upper sink groove, so that both ends of the sleeve have the same sealing performance.

[0008] Preferably, the end cover is fixedly connected to the inner sleeve or the outer sleeve through a connecting piece, the connecting piece includes a bolt, the end cover is provided with a connecting hole that passes through the upper and lower end surfaces, the lower fitting groove is provided with a lower screw hole on the inner top surface outside the lower clamping groove, and the upper fitting groove is provided with an upper screw hole on the inner bottom surface outside the upper clamping groove, and the bolt passes through the connecting hole and is threadedly engaged with the lower screw hole or the upper screw hole, and is fixed by tightening.

[0009] As a preferred embodiment, an annular groove is provided on the outer side surface of the transmission shaft, and the end of the truncated cone with a smaller diameter is suitable for fitting with the annular groove to form a rotating pair; the upper end of the transmission shaft is higher than the upper end surface of the outer sleeve, and the upper end of the transmission shaft is fixedly connected with a coupling ring for connecting with the driving mechanism outside the metal powder pulverizing equipment housing to realize transmission.

[0010] Preferably, a guide ring is provided between the inner sleeve and the outer sleeve, and the guide ring includes a check ring. The check ring is truncated cone-shaped, and the end with a smaller diameter points to the upper cavity, allowing only one-way flow of fluid from the lower cavity to the upper cavity to prevent backflow.

[0011] Preferably, the outer side of the end with a larger diameter of the check ring is provided with a limiting ring, the upper end surface of the inner sleeve is provided with a lower engaging groove, and the lower end surface of the outer sleeve is provided with an upper engaging groove, and the limiting ring is suitable for simultaneously fitting with the lower engaging groove and the upper engaging groove to limit the guide ring between the inner sleeve and the outer sleeve.

[0012] Preferably, the outer side surface of the upper end of the inner sleeve has a lower connecting ring, and the outer side surface of the lower end of the outer sleeve has an upper connecting ring. The connecting piece also includes a nut. The bolt passes through the lower connecting ring and the upper connecting ring and cooperates with the nut to achieve a fastened connection, so that the inner sleeve and the outer sleeve are connected to form a bent sleeve, and the disassembly and assembly operations are convenient.

[0013] Preferably, the outer side surface of the upper end of the upper connecting ring has a ring disk, the diameter of which is larger than that of the lower connecting ring and the upper connecting ring, and is used to be fixed on the outer side surface of the shell of the metal powder scattering equipment.

[0014] Compared with the prior art, the beneficial effects of this application are:

[0015] (1) By arranging a conical sealing ring structure at both ends of the shaft sleeve and utilizing the pressure of the airflow to keep the compression state between the sealing ring and the transmission shaft roughly stable, the sealing ring will not be too tight to accelerate wear, nor will it be too loose to reduce the airtightness of the sealing ring. Therefore, the sealing structure has better durability and more stable sealing performance.

[0016] (2) The dynamic sealing system has a compact structure and high structural stability. It can accurately judge the degree of sealing performance degradation with the help of air pressure sensor, and can better determine the timing of replacing the sealing ring. The replacement cycle of the sealing ring is effectively extended, the maintenance cost is lower, and it is more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the first view of the three-dimensional structure of the dynamic sealing system of the metal powder scattering equipment in the assembled state.

[0018] Figure 2 This is the second view of the three-dimensional structure of the dynamic sealing system of the metal powder scattering equipment in the assembled state.

[0019] Figure 3 It is a plan cross-sectional view of the dynamic sealing system of the metal powder scattering equipment in the assembled state.

[0020] Figure 4 The three-dimensional cross-sectional view is of the dynamic sealing system of the metal powder scattering equipment after the transmission shaft is removed.

[0021] Figure 5 This is a first cross-sectional view of the three-dimensional structure of the inner sleeve of the dynamic sealing system of the metal powder scattering equipment.

[0022] Figure 6 This is a second cross-sectional view of the three-dimensional structure of the inner sleeve of the dynamic sealing system of the metal powder scattering equipment.

[0023] Figure 7This is a first cross-sectional view of the three-dimensional structure of the outer sleeve of the dynamic sealing system of the metal powder scattering equipment.

[0024] Figure 8 This is a second cross-sectional view of the three-dimensional structure of the outer sleeve of the dynamic sealing system of the metal powder scattering equipment.

[0025] Fig. 9 The first cross-sectional view is a three-dimensional structure of the end cover of the dynamic sealing system of the metal powder scattering equipment.

[0026] Fig.10 This is a second cross-sectional view of the three-dimensional structure of the end cover of the dynamic sealing system of the metal powder scattering equipment.

[0027] Fig.11 This is a three-dimensional structural cross-sectional view of the sealing ring and end cover of the dynamic sealing system of the metal powder scattering equipment cooperating with the transmission shaft.

[0028] Fig.12 This is a first cross-sectional view of the three-dimensional structure of the sealing ring of the dynamic sealing system of the metal powder scattering equipment.

[0029] Fig.13 This is a second cross-sectional view of the three-dimensional structure of the sealing ring of the dynamic sealing system of the metal powder scattering equipment.

[0030] Fig.14 This is a three-dimensional structural cross-sectional view of the guide ring of the dynamic sealing system of the metal powder scattering equipment.

[0031] Fig.15 The present invention is a three-dimensional structural cross-sectional view of a transmission shaft matched with a dynamic sealing system of the metal powder scattering equipment.

[0032] In the figure: 1, transmission shaft; 101, coupling ring; 102, annular slide groove; 2, connecting piece; 201, bolt; 202, nut; 3, sealing ring; 301, truncated cone; 302, pressure-bearing surface; 303, annular ring; 304, dust shield ring; 4, end cover; 401, clamping edge; 402, connecting hole; 5, inner sleeve; 501, lower configuration groove; 502, lower clamping groove; 503, lower fitting groove; 504, sinking groove; 505, Lower screw hole; 506, air inlet end; 507, lower cavity; 508, lower connecting ring; 509, lower engaging groove; 6, outer sleeve; 601, upper configuration groove; 602, upper clamping groove; 603, upper fitting groove; 604, upper sinker groove; 605, upper screw hole; 606, exhaust end; 607, upper cavity; 608, upper connecting ring; 609, upper engaging groove; 610, ring disk; 7, guide ring; 701, limit ring; 702, check ring. DETAILED DESCRIPTION

[0033] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0034] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present application.

[0035] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0036] The terms "including" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0037] like Figure 1-15 The dynamic sealing system of the metal powder scattering device shown in the figure includes an inner sleeve 5 and an outer sleeve 6 sleeved on the outside of the transmission shaft 1. In addition to being restricted by the bearing, the transmission shaft 1 is also restricted in freedom by the inner sleeve 5 and the outer sleeve 6. Usually, the inner sleeve 5 is located above the bearing, and the outer sleeve 6 is located above the inner sleeve 5. The upper end of the inner sleeve 5 and the lower end of the outer sleeve 6 are fixedly connected. Specifically: the outer side surface of the upper end of the inner sleeve 5 has an outwardly expanding lower connecting ring 508, and the outer side surface of the lower end of the outer sleeve 6 has an outwardly expanding upper connecting ring 608. Generally, the diameter of the upper connecting ring 608 is equal to that of the lower connecting ring 508. Similarly, the connecting member 2 includes a bolt 201 and a nut 202. The bolt 201 passes through the aligned through holes on the lower connecting ring 508 and the upper connecting ring 608 and then cooperates with the nut 202 to be fixed by tightening. The upper outer side surface of the upper end of the upper connecting ring 608 has a ring disk 610. The diameter of the ring disk 610 is larger than that of the lower connecting ring 508 and the upper connecting ring 608. In this way, the lower connecting ring 508 and the upper connecting ring 608 can be hidden in the installation opening of the equipment shell, and the ring disk 610 with a larger diameter will be placed on the edge of the shell installation opening for fixed connection with the shell, thereby keeping the main part of the dynamic sealing system stable.

[0038] The lower end of the inner sleeve 5 and the upper end of the outer sleeve 6 are both provided with sealing rings 3 to prevent the fluid in the dynamic sealing system from leaking from the two ends of the sleeves. The sealing ring 3 includes a hollow truncated cone portion 301. The inner and outer side walls of the truncated cone portion 301 are both conical surfaces. The diameter of the opposite end faces of the two truncated cone portions 301 is the smallest. The outer side surface of the truncated cone portion 301 is a pressure-bearing surface 302. Because the fluid introduced into the dynamic sealing system is mostly inert gas, the pressure-bearing surface 302 mainly bears the air pressure. After the pressure-bearing surface 302 is compressed, the inner wall of the truncated cone portion 301 will be tightly attached to the outer side surface of the transmission shaft 1. Even if the transmission shaft 1 rotates relative to the truncated cone portion 301, the contact surface of the two can maintain good air tightness. In order to further improve the contact tightness between the sealing ring 3 and the transmission shaft 1, an annular groove 102 will be opened on the outer side surface of the transmission shaft 1. The diameter of the truncated cone portion 301 is relatively small. One end of the annular groove 102 fits perfectly with the annular groove 102 to form a rotating pair. The inner wall of the annular groove 102 can fit tightly with the inner wall and end face of the truncated cone 301. The outer side surface of the end with a larger diameter of the truncated cone 301 has a circular ring portion 303. The circular ring portion 303 is the part with the largest diameter of the entire sealing ring 3. The inner wall of the end with a larger diameter of the truncated cone 301 has a dust ring 304. The dust ring 304 is also truncated cone-shaped with conical inner and outer side walls. The inner wall of the end of the dust ring 304 away from the truncated cone 301 is tightly attached to the outer side face of the transmission shaft 1, which can effectively prevent dust from entering the gap between the truncated cone 301 and the transmission shaft 1. The upper end of the transmission shaft 1 is higher than the upper end face of the outer sleeve 6. The upper end of the transmission shaft 1 is fixedly connected with a coupling ring 101, which is generally connected to the output end of the driving mechanism outside the metal powder scattering equipment through a coupling.

[0039] The sealing ring 3 is constrained by the end cover 4 on the end face of the inner sleeve 5 or the outer sleeve 6. The outer side face of the end cover 4 has a card edge 401 for engaging with the lower end face of the inner sleeve 5 or the upper end face of the outer sleeve 6. The lower end face of the inner sleeve 5 is provided with a sinking groove 504, and the inner top face of the sinking groove 504 is provided with a lower fitting groove 503, and the inner top face of the lower fitting groove 503 is provided with a lower card groove 502, and the inner top face of the lower card groove 502 is provided with a lower configuration groove 501, so the lower end face of the inner sleeve 5 has a multi-stage coaxial rotary groove structure; the sealing ring 3 located at the bottom, its truncated cone portion 301 is just embedded in the lower configuration groove 501, and its annular portion 303 is just embedded in the lower card groove 502, the end cover 4 constraining the lower sealing ring 3 is just embedded in the lower fitting groove 503, and its card edge 401 is just embedded in the sinking groove 504, so that the inner sleeve 5 The lower end surface of the outer sleeve 6 will be relatively flat and can be completely in contact with the inner bottom surface of the mounting hole of the metal powder scattering equipment shell; the end surfaces of the inner and outer sleeves 6 also have the same structure. The upper end surface of the outer sleeve 6 is provided with an upper sinking groove 604, and the inner bottom surface of the upper sinking groove 604 is provided with an upper mating groove 603. The inner bottom surface of the upper mating groove 603 is provided with an upper clamping groove 602, and the inner bottom surface of the upper clamping groove 602 is provided with an upper configuration groove 601. The sealing ring 3 located above, its truncated cone portion 301 is just embedded in the upper configuration groove 601, and its annular portion 303 is just embedded in the upper clamping groove 602. The end cover 4 that constrains the lower sealing ring 3 is just embedded in the upper mating groove 603, and the clamping edge 401 is just embedded in the upper sinking groove 604. Similarly, the upper end surface of the outer sleeve 6 will be relatively flat and can remain parallel to the outer surface of the shell of the metal powder scattering equipment.

[0040] The end cover 4 is fixedly connected to the inner sleeve 5 or the outer sleeve 6 through the connecting piece 2. Since the connecting piece 2 includes a bolt 201 that can be used separately, in order to facilitate the connection and fixation of the bolt 201, the end cover 4 will be provided with a connecting hole 402 that passes through the upper and lower end surfaces, and the lower fitting groove 503 is provided with a lower screw hole 505 on the inner top surface outside the lower clamping groove 502, and the upper fitting groove 603 is provided with an upper screw hole 605 on the inner bottom surface outside the upper clamping groove 602. After the bolt 201 passes through the connecting hole 402, it is threadedly matched with the lower screw hole 505 or the upper screw hole 605 to achieve a fastened connection. The end cover 4 will press the annular portion 303 of the sealing ring 3 into the clamping groove, thereby ensuring the stable installation of the sealing ring 3.

[0041] The inner sleeve 5 has a lower cavity 507 inside, and the lower cavity 507 is a cavity with a rotary structure. The side wall of the inner sleeve 5 has an air inlet end 506 connected to the lower cavity 507, and the air inlet end 506 is connected to an external air supply pipeline. The inert gas first enters the lower cavity 507 through the air inlet end 506. The outer sleeve 6 has an upper cavity 607 inside, and the structures of the upper cavity 607 and the lower cavity 507 are similar and mirror images of each other. The side wall of the outer sleeve 6 has an exhaust end 606 connected to the upper cavity 607. The exhaust end 606 is connected to the external exhaust pipe, and the inert gas entering the upper cavity 607 will be discharged through the exhaust end 606. The extension directions of the air inlet end 506 and the exhaust end 606 are parallel, but opposite. Air pressure sensors are provided in the air inlet end 506 and the exhaust end 606 to sense the air pressure changes of the air flow entering and exiting the main part of the dynamic sealing system. The air pressure sensor is usually electrically connected to an industrial computer to facilitate the collection and comparison of the acquired air pressure data.

[0042] A guide ring 7 is provided between the inner sleeve 5 and the outer sleeve 6. The guide ring 7 includes a check ring 702. The check ring 702 is in a truncated cone shape, and both the inner and outer walls are conical surfaces. The end of the check ring 702 with a smaller diameter points to the upper cavity 607. In the absence of air pressure, the upper end of the check ring 702 will fit with the outer side of the transmission shaft 1. When the check ring 702 is affected by air pressure, the contact state with the transmission shaft 1 will be released. Therefore, the check ring 702 only allows the fluid to flow from the lower cavity 507 to the upper cavity 607 in one direction, which has The one-way cut-off function can effectively prevent the fluid backflow in the dynamic sealing system. The outer side of the larger diameter end of the check ring 702 is provided with a limit ring 701. The limit ring 701 is flat and has a certain thickness. The upper end face of the inner sleeve 5 is provided with a lower bite groove 509, and the lower end face of the outer sleeve 6 is provided with an upper bite groove 609. The limit ring 701 can fit with the lower bite groove 509 and the upper bite groove 609 at the same time. The limit ring 701 is limited by the bite groove between the end faces of the inner sleeve 5 and the outer sleeve 6, thereby maintaining the stability of the guide ring 7.

[0043] Working principle: This structure is usually arranged on the sealing shell of the metal powder pulverizing equipment. During installation, first fix the sealing ring 3 to the corresponding ends of the inner sleeve 5 and the outer sleeve 6 through the end cover 4 and the bolt 201, and then sleeve the outer sleeve 6 on the outside of the transmission shaft 1. Then, sleeve the check ring 702 of the guide ring 7 on the outside of the transmission shaft 1 facing the outer sleeve 6, and then sleeve the inner sleeve 5 on the outside of the transmission shaft 1. Adjust the axial positions of the inner sleeve 5 and the outer sleeve 6 outside the transmission shaft 1 so that the two frustum parts 301 are stuck in the annular groove 102 on the side of the transmission shaft 1. At this time, the limit ring 701 of the guide ring 7 will be stuck between the opposite end faces of the inner sleeve 5 and the outer sleeve 6. , use the connector 2 to fix the lower connecting ring 508 with the upper connecting ring 608, connect the two sleeves as one, connect the air inlet end 506 with the air pump, connect the exhaust end 606 with the exhaust pipe, and the end of the exhaust pipe is equipped with a weight sunk in the liquid. Then the structure can be inserted into the installation opening at the beginning of the sealing shell of the metal powder scattering equipment. The lower end of the transmission shaft 1 will pass through the bearing at the bottom of the installation opening and extend to the inside of the shell of the scattering equipment to connect with the stirring structure. The coupling ring 101 is connected to the output end of the driving mechanism outside the equipment shell. Finally, the ring disk 610 is fixedly connected to the shell of the scattering equipment through the connector 2 to complete the installation.

[0044] When the transmission shaft 1 rotates relative to the sleeve, the air pump will inject inert gas, such as nitrogen or argon, into the lower cavity 507 through the air inlet end 506. The airflow will enter the upper cavity 607 through the expanded guide ring 7. The airflow in the cavity will exert pressure on the pressure-bearing surface 302 of the upper and lower conical parts 301, so that the conical parts 301 are tightly fitted to the outer side of the transmission shaft 1, preventing the airflow from entering and exiting the sealed shell of the equipment. The gas in the upper cavity 607 will be discharged through the exhaust end 606. Since the end of the exhaust pipe is below the liquid level, obvious bubbles will be produced during the exhaust. Since the power of the air pump remains unchanged, it is possible to directly judge whether the dynamic sealing system is leaking by observing the changes in the frequency and size of the bubbles. Of course, the air pressure sensors in the air inlet end 506 and the exhaust end 606 will detect the changes in air pressure and transmit the data to the industrial computer to make a more accurate judgment on the working performance of the dynamic sealing system.

[0045] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. A dynamic sealing system for metal powder scattering equipment, characterized in that: The invention comprises an inner sleeve (5) and an outer sleeve (6) which are sleeved on the outside of a transmission shaft (1); the upper end of the inner sleeve (5) and the lower end of the outer sleeve (6) are fixedly connected; the lower end of the inner sleeve (5) and the upper end of the outer sleeve (6) are both provided with a sealing ring (3); the sealing ring (3) comprises a truncated cone portion (301); the end surfaces of the two truncated cone portions (301) having the smallest diameter relative to each other; the outer side surface of the truncated cone portion (301) is a pressure-bearing surface (302) which is suitable for bearing air pressure, so that the truncated cone portion (301) can be sealed to the outside of the transmission shaft (1); The inner wall of the inner sleeve (5) is in close contact with the outer side surface of the transmission shaft (1), the inner sleeve (5) has a lower cavity (507) inside, the side wall of the inner sleeve (5) has an intake end (506) connected to the lower cavity (507), the outer sleeve (6) has an upper cavity (607) inside, the side wall of the outer sleeve (6) has an exhaust end (606) connected to the upper cavity (607), and air pressure sensors are provided in both the intake end (506) and the exhaust end (606).

2. The dynamic sealing system of the metal powder scattering equipment according to claim 1, characterized in that: The outer side surface of the end with a larger diameter of the truncated cone portion (301) has a circular ring portion (303), and the inner wall of the end with a larger diameter of the truncated cone portion (301) has a dust shield ring (304), and the dust shield ring (304) is also truncated cone-shaped, and the inner wall of the end of the dust shield ring (304) away from the truncated cone portion (301) is tightly attached to the outer side surface of the transmission shaft (1); the sealing ring (3) is constrained by the end cover (4) on the end surface of the inner sleeve (5) or the outer sleeve (6), and the outer side surface of the end cover (4) has a clamping edge (401) suitable for clamping with the lower end surface of the inner sleeve (5) or the upper end surface of the outer sleeve (6).

3. The dynamic sealing system of the metal powder scattering equipment according to claim 2, characterized in that: The lower end surface of the inner sleeve (5) is provided with a sinking groove (504), the inner top surface of the sinking groove (504) is provided with a lower mating groove (503), the inner top surface of the lower mating groove (503) is provided with a lower clamping groove (502), and the inner top surface of the lower clamping groove (502) is provided with a lower configuration groove (501); the truncated cone portion (301) is suitable for being embedded in the lower configuration groove (501), the annular portion (303) is suitable for being embedded in the lower clamping groove (502), the end cover (4) is suitable for being embedded in the lower mating groove (503), and the clamping edge (401) is suitable for being embedded in the sinking groove (504).

4. The dynamic sealing system of the metal powder scattering equipment according to claim 3, characterized in that: The upper end surface of the outer sleeve (6) is provided with an upper groove (604), the inner bottom surface of the upper groove (604) is provided with an upper mating groove (603), the inner bottom surface of the upper mating groove (603) is provided with an upper clamping groove (602), and the inner bottom surface of the upper clamping groove (602) is provided with an upper configuration groove (601); the truncated cone portion (301) is suitable for being embedded in the upper configuration groove (601), the annular portion (303) is suitable for being embedded in the upper clamping groove (602), the end cover (4) is suitable for being embedded in the upper mating groove (603), and the clamping edge (401) is suitable for being embedded in the upper groove (604).

5. The dynamic sealing system of the metal powder scattering equipment according to claim 4, characterized in that: The end cover (4) is fixedly connected to the inner sleeve (5) or the outer sleeve (6) via a connecting piece (2); the connecting piece (2) comprises a bolt (201); the end cover (4) is provided with a connecting hole (402) penetrating the upper and lower end surfaces; the lower engaging groove (503) is provided with a lower screw hole (505) on the inner top surface outside the lower clamping groove (502); the upper engaging groove (603) is provided with an upper screw hole (605) on the inner bottom surface outside the upper clamping groove (602); the bolt (201) passes through the connecting hole (402) and then is threadedly engaged with the lower screw hole (505) or the upper screw hole (605).

6. The dynamic sealing system of the metal powder scattering equipment according to claim 5, characterized in that: The outer side surface of the transmission shaft (1) is provided with an annular sliding groove (102), and the end with a smaller diameter of the truncated cone portion (301) is suitable for fitting with the annular sliding groove (102) to form a rotating pair; the upper end of the transmission shaft (1) is higher than the upper end surface of the outer sleeve (6), and the upper end of the transmission shaft (1) is fixedly connected to a coupling ring (101).

7. The dynamic sealing system of the metal powder scattering equipment according to any one of claims 1 to 6, characterized in that: A guide ring (7) is provided between the inner sleeve (5) and the outer sleeve (6), and the guide ring (7) comprises a check ring (702). The check ring (702) is truncated cone-shaped, and the end with a smaller diameter points to the upper cavity (607), allowing only one-way flow of fluid from the lower cavity (507) to the upper cavity (607).

8. The dynamic sealing system of the metal powder scattering equipment according to claim 7, characterized in that: The outer side of the larger diameter end of the non-return ring (702) is provided with a limit ring (701), the upper end surface of the inner sleeve (5) is provided with a lower engagement groove (509), and the lower end surface of the outer sleeve (6) is provided with an upper engagement groove (609), and the limit ring (701) is suitable for simultaneously fitting with the lower engagement groove (509) and the upper engagement groove (609).

9. The dynamic sealing system of the metal powder scattering equipment according to any one of claims 5 to 6, characterized in that: The outer side surface of the upper end of the inner sleeve (5) has a lower connecting ring (508), and the outer side surface of the lower end of the outer sleeve (6) has an upper connecting ring (608). The connecting member (2) also includes a nut (202), and the bolt (201) passes through the lower connecting ring (508) and the upper connecting ring (608) and then cooperates with the nut (202).

10. The dynamic sealing system of the metal powder scattering equipment according to claim 9, characterized in that: The upper outer side surface of the upper connecting ring (608) is provided with a ring disk (610), and the diameter of the ring disk (610) is larger than that of the lower connecting ring (508) and the upper connecting ring (608).

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