A rotary dynamic seal device

Abstract

The utility model relates to a hydraulic transmission technical field especially relates to a rotary dynamic sealing device, including casing, rotating shaft and impeller, the impeller sets up in the inner chamber of casing, rotating shaft transversely inserts in casing, and the sleeve pipe is integrally formed at the central position of impeller, impeller is through the sleeve pipe and is slidably arranged on rotating shaft, a plurality of pawls are integrally formed on the right end surface of sleeve pipe, the strip slot is opened on the outer periphery of rotating shaft, and the long direction of strip slot is parallel with the axis of rotating shaft, the pawl is stuck in strip slot, and pawl and strip slot slide fit, the impeller can move on the rotating shaft in the utility model, and effectively overcome the problem that the rotor structure formed by impeller and rotating shaft produces axial excursion.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic transmission technology, and in particular to a rotary dynamic sealing device. Background Technology

[0002] In electromechanical and hydraulic transmission structural products, liquid oil media are often used for sealing. Poor sealing performance can cause oil leakage in mechanical products, pollute the environment, and even cause equipment to malfunction. In particular, it can cause extremely serious quality accidents, especially for spacecraft.

[0003] The dynamic sealing structure formed by impeller rotation is a key technology in fluid machinery (such as pumps, compressors, turbines, etc.) used to reduce fluid leakage between the high-pressure and low-pressure sides. Its core is to achieve sealing while allowing relative motion through the dynamic cooperation between rotating and stationary components. For example, patent application CN106763798A discloses a swirl-jet centrifugal sealing device. A fixed, axially distributed manifold on the swirl-jet impeller collects high-speed rotating sealing fluid and converges it into a circular groove on the impeller. This converts the kinetic energy of the sealing fluid into pressure energy, causing the high-pressure sealing fluid to be ejected along the gas leakage direction, thus preventing gas leakage on the high-pressure side.

[0004] In existing common impeller-type dynamic seal structures, the rotating shaft is often mounted on the housing, and the impeller inside the housing is fixedly installed on the rotating shaft. The rotating shaft drives the impeller to rotate, forming a dynamic seal structure. Since the rotating shaft is usually mounted with bearings, and bearings have radial and axial clearances, when high-pressure liquid enters the housing, it will impact the impeller, causing axial movement of the rotor structure formed by the impeller and the rotating shaft. Utility Model Content

[0005] The main objective of this invention is to propose a rotary dynamic sealing device to solve the aforementioned technical problems.

[0006] To achieve the above objectives, this utility model proposes a rotary dynamic sealing device, comprising a housing, a rotating shaft, and an impeller, wherein the impeller is disposed in the inner cavity of the housing; the rotating shaft is laterally inserted into the housing, and a sleeve is integrally formed at the center position of the impeller; the impeller is slidably fitted onto the rotating shaft through the sleeve; multiple pawls are integrally formed on the right end face of the sleeve; a strip-shaped groove is formed on the outer circumferential surface of the rotating shaft, the longitudinal direction of the strip-shaped groove being parallel to the axis of the rotating shaft; the pawls are engaged in the strip-shaped groove, and the pawls slide in cooperation with the strip-shaped groove.

[0007] Preferably, there are two pawls, which are symmetrically distributed at 180 degrees on the right end face of the sleeve; there are two strip grooves, and the two pawls are respectively engaged in the corresponding strip grooves.

[0008] Preferably, the impeller divides the inner cavity of the housing into a left cavity and a right cavity; the impeller includes a disk and blades, the blades being integrally formed on the left side of the disk; a first pipe connector and a second pipe connector are provided on the left side wall of the housing, and the center of the first pipe connector and the second pipe connector are respectively provided with transverse through holes communicating to the left cavity of the housing.

[0009] Preferably, pipe fittings are screwed onto the first pipe fitting seat and the second pipe fitting seat respectively.

[0010] Preferably, the pipe joint of the first pipe fitting is connected to the oil tank via an oil pipe, and an oil pump is installed on the oil pipe.

[0011] Preferably, the left end of the rotating shaft is inserted into the left side wall of the housing, and a first sealing ring is provided between the left end of the rotating shaft and the left side wall of the housing.

[0012] Preferably, the right end of the rotating shaft protrudes from the right side wall of the housing, and a second sealing ring is provided between the rotating shaft and the right side wall of the housing.

[0013] Preferably, the rotary dynamic sealing device further includes a drive motor, the output shaft of which is connected to the right end of the rotary shaft via a coupling.

[0014] Due to the adoption of the above technical solution, the beneficial effects of this utility model are as follows:

[0015] Since the impeller is slidably mounted on the rotating shaft through the sleeve, and the pawl is engaged in the slot, the pawl and the slot slide together. This structure allows the impeller to move axially on the rotating shaft, effectively overcoming the problem of axial movement caused by the rotor structure formed by the impeller and the rotating shaft. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the rotary dynamic sealing device provided by this utility model.

[0018] Figure 2 This is a three-dimensional structural diagram of the rotating shaft and impeller in this utility model.

[0019] Figure 3 This is a three-dimensional structural diagram of the impeller in this utility model.

[0020] Explanation of reference numerals in the attached drawings: 1. Housing; 1a. First pipe connector; 1b. Second pipe connector; 2. Rotating shaft; 2a. Slot; 3. Impeller; 3a. Disc; 3b. Blade; 3c. Sleeve; 3d. Pawl; 4. Pipe joint; 5. First sealing ring; 6. Second sealing ring; 7. Drive motor; 8. Coupling; 9. Oil pump. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0023] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0024] Combination Figures 1 to 3As shown, a rotary dynamic sealing device includes a housing 1, a rotating shaft 2, and an impeller 3. The impeller 3 is disposed within the inner cavity of the housing 1. The rotating shaft 2 is laterally inserted into the housing 1. A sleeve 3c is integrally formed at the center of the impeller 3. The impeller 3 is slidably fitted onto the rotating shaft 2 through the sleeve 3c. Multiple pawls 3d are integrally formed on the right end face of the sleeve 3c. A strip groove 2a is formed on the outer circumferential surface of the rotating shaft 2, the longitudinal direction of which is parallel to the axis of the rotating shaft 2. The pawls 3d are engaged in the strip groove 2a, and the pawls 3d slide in contact with the strip groove 2a. Because the pawls 3d are engaged in the strip groove 2a, when the rotating shaft 2 rotates, it can drive the impeller 3 to rotate together. In addition, because the impeller 3 is slidably fitted onto the rotating shaft through the sleeve 3c, and the pawls slide in contact with the strip groove, this structure allows the impeller 3 to move axially on the rotating shaft 2.

[0025] Combination Figure 2 and Figure 3 As shown, there are two pawls 3d, which are symmetrically distributed at 180 degrees on the right end face of the sleeve 3c; there are two strip grooves 2a, and the two pawls 3d are respectively engaged in the corresponding strip grooves 2a.

[0026] Combination Figure 1 As shown, the impeller 3 divides the inner cavity of the housing 1 into a left cavity and a right cavity; the impeller 3 includes a disk 3a and blades 3b, with the blades 3b integrally formed on the left side surface of the disk 3b; a first pipe connector 1a and a second pipe connector 1b are provided on the left side wall of the housing 1, and the centers of the first pipe connector 1a and the second pipe connector 1b are respectively provided with transverse through holes connecting to the left cavity of the housing 1. In actual operation, the left cavity is the high-pressure cavity, and the right cavity is the low-pressure cavity. Further, pipe joints 4 are screwed onto the first pipe connector 1a and the second pipe connector 1b respectively. The pipe joint 4 of the first pipe connector 1a is connected to the oil tank through an oil pipe, and an oil pump 9 is provided on the oil pipe.

[0027] Combination Figure 1 As shown, the left end of the rotating shaft 2 is inserted into the left side wall of the housing 1, and a first sealing ring 5 is provided between the left end of the rotating shaft 2 and the left side wall of the housing 1. The right end of the rotating shaft 2 protrudes from the right side wall of the housing 1, and a second sealing ring 6 is provided between the rotating shaft 2 and the right side wall of the housing 1.

[0028] Combination Figure 1 As shown, the rotary dynamic sealing device also includes a drive motor 7, the output shaft of which is connected to the right end of the rotary shaft 2 via a coupling 8.

[0029] The working principle of the above-mentioned rotary dynamic sealing device is as follows:

[0030] When the drive motor 7 drives the rotating shaft 2 to rotate, the two symmetrical pawls 3d cooperate with the strip groove 2a on the rotating shaft 2, causing the impeller 3 to rotate as well. At this time, the power oil enters the left cavity of the housing 1 from the center hole of the first pipe connector 1a under the action of the oil pump 9. Since the impeller 3 can float left and right on the rotating shaft 2, the problem of axial movement of the rotor structure formed by the impeller 3 and the rotating shaft 2 can be avoided. Under the action of the high-speed rotation of the impeller 3, the power oil flows out from the center hole (oil outlet) of the second pipe connector 1a.

[0031] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the concept of the present utility model and using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present utility model.

Claims

1. A rotary dynamic sealing device, comprising a housing (1), a rotating shaft (2), and an impeller (3), wherein the impeller (3) is disposed within the inner cavity of the housing (1); characterized in that, The rotating shaft (2) is horizontally inserted into the housing (1), and a sleeve (3c) is integrally formed at the center of the impeller (3); The impeller (3) is slidably mounted on the rotating shaft (2) through the sleeve (3c); Multiple pawls (3d) are integrally formed on the right end face of the sleeve (3c); A strip groove (2a) is provided on the outer circumferential surface of the rotating shaft (2), and the longitudinal direction of the strip groove (2a) is parallel to the axis of the rotating shaft (2); The pawl (3d) is engaged in the groove (2a), and the pawl (3d) slides in contact with the groove (2a).

2. The rotary dynamic sealing device as described in claim 1, characterized in that, There are two pawls (3d), which are symmetrically distributed at 180 degrees on the right end face of the sleeve (3c); there are two strip grooves (2a), and the two pawls (3d) are respectively engaged in the corresponding strip grooves (2a).

3. The rotary dynamic sealing device as described in claim 1, characterized in that, The impeller (3) divides the inner cavity of the housing (1) into a left cavity and a right cavity; The impeller (3) includes a disk (3a) and blades (3b), wherein the blades (3b) are integrally formed on the left side surface of the disk (3a); A first pipe connector (1a) and a second pipe connector (1b) are provided on the left side wall of the housing (1), and the center of the first pipe connector (1a) and the second pipe connector (1b) are respectively provided with transverse through holes that connect to the left cavity of the housing (1).

4. A rotary dynamic sealing device as described in claim 3, characterized in that, Pipe fittings (4) are screwed onto the first pipe fitting (1a) and the second pipe fitting (1b), respectively.

5. A rotary dynamic sealing device as described in claim 4, characterized in that, The pipe joint (4) of the first pipe joint (1a) is connected to the oil tank through an oil pipe, and an oil pump (9) is installed on the oil pipe.

6. A rotary dynamic sealing device as described in claim 1, characterized in that, The left end of the rotating shaft (2) is inserted into the left side wall of the housing (1), and a first sealing ring (5) is provided between the left end of the rotating shaft (2) and the left side wall of the housing (1).

7. A rotary dynamic sealing device as described in claim 1, characterized in that, The right end of the rotating shaft (2) extends through the right side wall of the housing (1), and a second sealing ring (6) is provided between the rotating shaft (2) and the right side wall of the housing (1).

8. A rotary dynamic sealing device as described in claim 1, characterized in that, It also includes a drive motor (7), the output shaft of which is connected to the right end of the rotating shaft (2) via a coupling (8).

Images