A zero speed state dry gas seal full end face film pressure distribution testing device

Abstract

The application discloses a zero-speed state dry gas seal full-end surface film pressure distribution testing device, which comprises a rotatable static ring assembly and a translatable testing ring assembly, the rotatable static ring assembly is fixed on a fixed frame, the rotatable static ring assembly is connected with the translatable testing ring assembly, the lower end of the rotatable static ring assembly is embedded with a test static ring, the upper surface of the translatable testing ring assembly is embedded with a testing ring, an airflow inner cavity is formed between the lower end surface of the test static ring and the upper end surface of the testing ring, a throttling air cavity is formed between the upper end surface of the test static ring and the rotatable static ring assembly, the rotatable static ring assembly drives the test static ring to rotate on the upper surface of the testing ring, and the translatable testing ring assembly drives the testing ring to translate relative to the test static ring, so that full-end surface film pressure testing is realized. The application realizes the testing of the full-end surface film pressure distribution of the dry gas seal, has a simple and compact structure, is convenient and fast to adjust, and simultaneously realizes the adjustment of the load of the test static ring.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of dry gas seal performance testing devices, and particularly relates to a dry gas seal full-end-face film pressure distribution testing device under zero-speed state. BACKGROUND

[0002] The dry gas seal is an advanced seal widely applied to the shaft end of rotating machinery such as compressors, centrifugal pumps and stirred tanks, and generally forms a gas film with certain carrying capacity and rigidity between the dynamic and static ring end faces by opening micron-depth dynamic pressure grooves or setting static pressure throttling structures, thereby realizing non-contact operation. The gas film rigidity and carrying capacity of the dry gas seal are crucial for balancing the sealing closing force and resisting external disturbances to form a stable gas film, and the values thereof depend on the end face gas film pressure distribution. On the other hand, the throttling gas of the orifice throttling static pressure dry gas seal will have a pressure drop and a rise near the orifice outlet, which is closely related to the micro-vibration and gas hammer self-vibration of the static pressure dry gas seal. As can be seen, the accurate testing of the dry gas seal end face film pressure distribution is of great significance for accurately calculating the gas film carrying capacity, the gas film rigidity and verifying the accuracy of the gas film pressure distribution numerical simulation results.

[0003] Chinese patent CN110296839A discloses a gas film pressure testing device and testing method for a gas bearing. The pressurized gas enters from the fixed static ring center placed in the upper part and flows out to the four sides, and the testing ring placed in the lower part can move along a certain fixed direction, thereby realizing the testing of the radial gas film pressure distribution of the bearing gap. Different from the static pressure gas bearing in which only one pressurized throttling gas enters the bearing gap, the outer diameter side of the annular sealing ring of the static pressure dry gas seal is provided with a pressurized sealing cavity, and the inner diameter side is a leakage cavity. At the same time, the gas film pressure changes along the radial and circumferential dimensions, so the existing static pressure gas bearing pressure distribution testing device cannot adapt to the testing of the full-end-face pressure distribution of the dry gas seal, especially the static pressure dry gas seal, because it does not have an external closed pressure cavity and can only realize the pressure distribution testing of one dimension in the radial direction. How to adjust the load borne by the gas lubricated component through an external structure to change the gas film thickness is also a key problem. The existing technology generally uses the method of adding weights to realize this, and this method can realize a relatively small range of load control, and the weights are difficult to realize continuous load adjustment. SUMMARY

[0004] In order to improve the problems in the prior art that the gap pressure distribution testing device of the static pressure gas lubricated component does not have an external pressure cavity, cannot simultaneously realize radial and circumferential two-dimensional regulation, and the load adding method is not good, the purpose of the present application is to provide a dry gas seal full-end-face film pressure distribution testing device under zero-speed state.

[0005] To achieve the above-mentioned purpose, the following technical scheme is proposed:

[0006] A zero-speed state dry gas seal full-face film pressure distribution testing device, comprising a rotatable static ring assembly and a translatable test ring assembly, the rotatable static ring assembly is fixed on a fixed frame, the rotatable static ring assembly is connected with the translatable test ring assembly, the lower end of the rotatable static ring assembly is embedded with a test static ring, the upper surface of the translatable test ring assembly is embedded with a test ring, the lower end surface of the test static ring and the upper end surface of the test ring form an airflow inner cavity, the upper end surface of the test static ring and the rotatable static ring assembly form a throttling air cavity, the rotatable static ring assembly drives the test static ring to rotate on the upper surface of the test ring, and the translatable test ring assembly drives the test ring to translate relative to the test static ring to realize full-face film pressure testing.

[0007] Further, the fixed frame comprises a bottom plate, a support column, an upper panel, a universal bearing and a sealing cavity, the support column is used for supporting the connection between the bottom plate and the upper panel, the universal bearing is fixed on the bottom plate, the universal bearing is located below the translatable test ring assembly, the sealing cavity is fixed below the upper panel, the rotatable static ring assembly is fixed on the upper panel, the sealing cavity is arranged outside the rotatable static ring assembly, and the lower end of the sealing cavity is connected with the translatable test ring assembly, the lower end of the sealing cavity, the upper surface of the translatable test ring assembly, the outer side of the test static ring and the outer side of the test ring form an airflow outer cavity.

[0008] Further, the rotatable static ring assembly comprises a rotation driving assembly, a pressure regulating cavity and a static ring mounting mechanism, the rotation driving assembly is fixed on the upper panel, the lower end of the rotation driving assembly is connected with the pressure regulating cavity, the pressure regulating cavity is located below the upper panel, the lower end of the pressure regulating cavity is connected with the static ring mounting mechanism, the lower end of the static ring mounting mechanism is used for mounting the test static ring, and the sealing cavity is used for sealing the pressure regulating cavity and the static ring mounting mechanism.

[0009] Further, the upper end surface of the test ring is provided with a pressure guiding hole, and the lower surface is provided with a mounting hole, the pressure guiding hole and the mounting hole are communicated, the mounting hole is provided with a pressure sensor for testing the gas film pressure, the inner diameter of the test ring is smaller than the inner diameter of the test static ring, and the outer diameter of the test ring is greater than the outer diameter of the test static ring.

[0010] Further, the test static ring is a static pressure type static ring or a dynamic pressure type static ring, when the test static ring is a static pressure type static ring, the side edges of the static ring mounting mechanism and the sealing cavity are provided with a communication gas inlet channel, the gas inlet channel is communicated with the throttling air cavity, the airflow enters the gas inlet channel, and then sequentially passes through the throttling air cavity, the gas hole of the static pressure type static ring, the throttling hole and the sealing gap to enter the airflow outer cavity and the airflow inner cavity, and then flows out from the gas outlet channel of the sealing cavity and the gas outlet of the test ring respectively; when the test static ring is a dynamic pressure type static ring, the airflow enters the airflow outer cavity, the shallow groove of the lower end surface of the dynamic pressure type static ring and the airflow inner cavity in sequence from the gas inlet channel of the sealing cavity, and then flows out from the gas outlet of the test ring.

[0011] Further, the pressure regulating cavity comprises a pressure regulating cavity cavity and a pressure regulating cavity lower plate, the pressure regulating cavity cavity and the pressure regulating cavity lower plate are connected by a pin and sealed by an auxiliary sealing ring, the pressure regulating cavity cavity is provided with an air inlet hole, the air inlet hole is communicated with the external gas pipeline, the load borne by the test static ring is regulated by changing the pressure of the gas medium in the pressure regulating cavity, and the gas mold thickness between the test static ring and the test ring end face is changed, the static ring mounting mechanism comprises a static ring seat, a static ring inner clamping seat and a static ring seat upper plate, the upper surface of the static ring seat upper plate is connected with the pressure regulating cavity lower plate, the static ring inner clamping seat and the static ring seat are fastened and connected with the static ring seat upper plate through fasteners respectively, the static ring inner clamping seat is embedded in the static ring seat, and the static ring inner clamping seat presses the test static ring in the static ring seat.

[0012] Further, the rotating driving assembly comprises a rotating connecting rod, a rotating table and a cylindrical rotating piece, the rotating table is fixed above the upper plate, the rotating connecting rod is connected with the cylindrical rotating piece through the rotating table, a hand wheel is arranged on the rotating table, the rotating connecting rod is rotated by rotating the hand wheel, the cylindrical rotating piece is connected with the pressure regulating cavity, and the circumferential transmission between the cylindrical rotating piece and the pressure regulating cavity is realized through a transmission pin.

[0013] Further, the translatable test ring assembly comprises a limiting mechanism, a moving driving mechanism, a displacement testing mechanism and a test ring mounting plate, the test ring is mounted on the test ring mounting plate, the universal bearing is located below the test ring mounting plate, the limiting mechanism is mounted on both sides of the test ring mounting plate in the vertical movement direction, and the test ring mounting plate in the translation process is limited, the moving driving mechanism and the displacement testing mechanism are mounted on one side or both sides of the test ring mounting plate in the movement direction, the limiting mechanism comprises a U-shaped limiting plate, a first fixed vertical plate and a threaded adjusting rod, one end of the threaded adjusting rod passes through the first fixed vertical plate and is connected with the first fixed vertical plate in a threaded manner, the end is fixedly connected with the U-shaped limiting plate, the opening of the U-shaped limiting plate faces the test ring mounting plate, and the first fixed vertical plate is fixed vertically on the bottom plate; the distance between the two U-shaped limiting plates is adjusted by adjusting the threaded adjusting rod, so that the test ring mounting plate is fixed, the moving driving mechanism comprises a second fixed vertical plate and an adjusting screw, the adjusting screw is threadedly connected with the second fixed vertical plate, one end of the adjusting screw faces the test ring mounting plate, and the translation of the test ring mounting plate is realized by adjusting the adjusting screw, the displacement testing mechanism is a displacement sensor, the U-shaped limiting plate, the adjusting screw and the test ring mounting plate are on the same horizontal plane, and the moving distance is detected by the displacement sensor.

[0014] Further, the flexible scale is arranged on the upper plate of the static ring seat, the same horizontal plane of the upper plate of the static ring seat is provided with a peephole, and the scale of the upper plate of the static ring seat is read through the peephole. Due to the existence of the transmission pin, the rotation angle of the rotating table and the rotation angle of the upper plate of the static ring seat will have a certain deviation. The upper plate of the static ring seat is connected with the static ring seat by using a fastener, and there is no pin transmission, so the rotation angle of the flexible scale of the upper plate of the static ring seat is considered as the rotation angle of the test static ring.

[0015] Further, the upper end surface of the pressure regulating cavity and the lower end surface of the upper panel are provided with a thrust bearing, the thrust bearing is arranged outside the cylindrical rotating part, and the upper ring of the thrust bearing is kept stationary with the upper panel during rotation, and the lower ring of the thrust bearing rotates with the pressure regulating cavity, thereby reducing the circumferential resistance of the test static ring.

[0016] Working principle: the airflow outer cavity on the outer diameter side of the test static ring is a medium pressure cavity, which is connected with the external medium gas pipeline through the air passage on the sealing cavity, and auxiliary sealing rings are arranged between the lower end surface of the sealing cavity and the upper surface of the test ring mounting plate and between the static ring seat and the sealing cavity body to form a sealed pressure cavity. The inner diameter side of the static pressure type static ring is an airflow inner cavity, which is connected with the external leakage gas pipeline through the through hole on the test ring. When the test static ring is of the static pressure type, the airflow enters from the air inlet through hole on the sealing cavity body, passes through the air passage and the throttle hole of the static pressure type static ring, and then enters the airflow inner cavity and the medium pressure cavity respectively to leak outward. When the test static ring is of the dynamic pressure type, the airflow enters from the medium pressure cavity and leaks outward from the airflow inner cavity. The rotatable static ring assembly drives the test static ring to rotate, the pressure of the medium in the pressure regulating cavity is adjusted to change the gas film thickness between the test static ring and the test ring, the pressure sensor is arranged on the test ring to test the gas film pressure of the sealing end surface, the displacement test mechanism and the movement driving mechanism are arranged on both sides of the test ring mounting plate to realize the regulation and detection of the radial displacement of the test ring, the limiting mechanism is used to limit the movement freedom degree of the test ring mounting plate in the vertical movement direction, the test ring mounting plate is supported by a plurality of arranged universal bearings below to reduce the resistance in the movement process, and the combination of the circumferential rotation of the test static ring and the radial translation of the test ring can realize the full coverage of the test ring end face pressure guiding hole relative to any point of the test static ring end face, and the test of the full end surface film pressure distribution of the dry gas seal is also realized. When the test of the full end surface film pressure distribution of the dry gas seal starts, the test static ring is rotated to a certain angle through the rotating table, then the test ring is moved to realize the test of the radial gas film pressure at a certain circumferential position, then the circumferential angle of the test static ring is adjusted slightly, and the above process is repeated. Slow rotation will not affect the gas film pressure, and the movement is recorded once during the air passage process, and cannot be interrupted.

[0017] Compared with the prior art, the present application has the following advantages:

[0018] 1) The present application can realize the test of the full-face film pressure distribution of the dry gas seal by the circumferential rotation of the static ring assembly and the radial translation of the test ring assembly, has simple and compact structure, and is convenient and fast to adjust, and the test of the full-face film pressure distribution of the dry gas seal, the gas thrust bearing and the air floating platform of different dynamic pressure type and static pressure type can be realized by replacing the test static ring with different structure;

[0019] 2) The small-range fine adjustment and large-range adjustment of the load of the test static ring can be realized by changing the way of adjusting the gas pressure in the pressure adjusting cavity, and then the gas film thickness between the static ring and the test ring is adjusted, the load adjustment mode of the test piece is simple, and the adjustment range is wide. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a cross-sectional view of the static pressure type dry gas seal film pressure distribution test device of the present application;

[0021] Figure 2 It is a three-dimensional structure schematic diagram of the rotatable static ring assembly of the present application;

[0022] Figure 3 It is a three-dimensional structure schematic diagram of the translatable test ring assembly of the present application;

[0023] Figure 4 It is a schematic diagram of the static pressure type static ring of the present application;

[0024] Figure 5 It is a test ring cross-sectional view of the present application;

[0025] Figure 6 It is a cross-sectional view of the dynamic pressure type dry gas seal film pressure distribution test device of the present application;

[0026] Figure 7 It is a three-dimensional structure schematic diagram of the dynamic pressure type static ring of the present application.

[0027] In the figure: 1, rotatable static ring assembly; 11, rotating driving assembly; 111, rotating connecting rod; 112, rotating table; 113, cylindrical rotating part; 12, pressure adjusting cavity; 121, pressure adjusting cavity body; 122, pressure adjusting cavity lower plate; 13, static ring mounting mechanism; 131, static ring seat; 132, static ring inner clamping seat; 133, static ring seat upper plate; 2, translatable test ring assembly; 21, limiting mechanism; 211, U-shaped limiting plate; 212, first fixed vertical plate; 213, threaded adjusting rod; 22, moving driving mechanism; 221, second fixed vertical plate; 222, adjusting screw; 23, displacement testing mechanism; 24, test ring mounting plate; 3, fixed frame; 31, bottom plate; 32, supporting column; 33, upper plate; 34, universal bearing; 35, sealing cavity; 4, test static ring; 41, air vent hole; 42, throttle hole; 43, shallow groove; 5, test ring; 51, pressure introduction hole; 52, mounting hole; 53, pressure sensor; 6, throttling gas cavity; 7, thrust bearing. DETAILED DESCRIPTION

[0028] The application will be further described below in conjunction with the accompanying drawings and examples, but the scope of protection of the application is not limited thereto.

[0029] A zero-speed state dry gas seal full-face film pressure distribution testing device, comprising a rotatable static ring assembly 1, a translatable testing ring assembly 2 and a fixed frame 3, as shown in Figure 1 , the fixed frame 3 comprises a bottom plate 31, a support column 32, an upper panel 33, a universal bearing 34 and a sealing cavity 35, the support column 32 is used to support the connection between the bottom plate 31 and the upper panel 33, the universal bearing 34 is fixed on the bottom plate 31, the universal bearing 34 is located below the translatable testing ring assembly 2, and the sealing cavity 35 is fixed below the upper panel 33, as shown in Figure 1 、 Figure 2 and Figure 6As shown, the rotatable static ring assembly 1 includes a rotation driving assembly 11, a pressure regulating cavity 12 and a static ring mounting mechanism 13. The rotation driving assembly 11 includes a rotating connecting rod 111, a rotating table 112 and a cylindrical rotating part 113. The rotating table 112 is fixed above the upper panel 33. The rotating connecting rod 111 is connected with the cylindrical rotating part 113 through the rotating table 112. A hand wheel is installed on the rotating table 112. The hand wheel is connected with the rotating connecting rod 111 through a worm and gear connection mode. The rotation of the rotating connecting rod 111 is driven by rotating the hand wheel. The pressure regulating cavity 12 includes a pressure regulating cavity body 121 and a pressure regulating cavity lower plate 122. The pressure regulating cavity body 121 and the pressure regulating cavity lower plate 122 are connected through a pin and sealed by an auxiliary sealing ring. An air inlet hole is formed on the pressure regulating cavity body 121. The air inlet hole is communicated with an external gas pipeline. The load borne by the test static ring 4 is regulated by changing the gas medium pressure in the pressure regulating cavity 12 to change the gas mold thickness between the test static ring 4 and the test ring 5. The cylindrical rotating part 113 is connected with the pressure regulating cavity body 121. The circumferential transmission between the cylindrical rotating part 113 and the pressure regulating cavity 12 is realized through a transmission pin. The pressure regulating cavity 12 is located below the upper panel 33. A thrust bearing 7 is arranged between the upper end surface of the pressure regulating cavity body 121 and the lower end surface of the upper panel 33. The thrust bearing 7 is arranged outside the cylindrical rotating part 113. During the rotation process, the upper ring of the thrust bearing 7 remains stationary with the upper panel 33. The lower ring of the thrust bearing 7 rotates with the pressure regulating cavity body 121. The static ring mounting mechanism 13 includes a static ring seat 131, a static ring inner clamping seat 132 and a static ring seat upper plate 133. The upper surface of the static ring seat upper plate 133 is connected with the pressure regulating cavity lower plate 122. The static ring inner clamping seat 132 and the static ring seat 131 are fastened and connected with the static ring seat upper plate 133 through fasteners. The static ring inner clamping seat 132 is embedded in the static ring seat 131. The static ring inner clamping seat 132 presses the test static ring 4 in the static ring seat 131. The circumferential transmission between the pressure regulating cavity 12 and the static ring seat upper plate 133 is realized through a transmission pin. The inner wall of the sealing cavity 35 is attached to the static ring mounting mechanism 13. The lower end is attached to the upper surface of the translatable test ring assembly 2. A flexible scale is arranged on the static ring seat upper plate 133. A sight hole is formed at the same horizontal plane of the sealing cavity 35 and the static ring seat upper plate 133 for reading the scale of the static ring seat upper plate 133.

[0030] As Figure 1 , Figure 3 and Figure 6As shown, the translatable test ring assembly 2 includes a limiting mechanism 21, a movement driving mechanism 22, a displacement testing mechanism 23 and a test ring mounting plate 24, the test ring 5 is mounted on the test ring mounting plate 24, the universal bearing 34 is located below the test ring mounting plate 24, the limiting mechanism 21 is mounted on both sides of the test ring mounting plate 24 along the vertical movement direction, limiting the test ring mounting plate 24 during translation, the movement driving mechanism 22 and the displacement testing mechanism 23 are mounted on one side or both sides of the test ring mounting plate 24 along the movement direction, the limiting mechanism 21 includes a U-shaped limiting plate 211, a first fixed vertical plate 212 and a threaded adjusting rod 213, one end of the threaded adjusting rod 213 passes through the first fixed vertical plate 212 and is perpendicularly screwed with the first fixed vertical plate 212, the end is fixedly connected with the U-shaped limiting plate 211, the opening of the U-shaped limiting plate 211 faces the test ring mounting plate 24, the first fixed vertical plate 212 is perpendicularly fixed on the bottom plate 31, the distance between the two U-shaped limiting plates 211 is adjusted by adjusting the threaded adjusting rod 213, so as to fix the test ring mounting plate 24, the movement driving mechanism 22 includes a second fixed vertical plate 221 and an adjusting screw 222, the adjusting screw 222 is screwed with the second fixed vertical plate 221, one end of the adjusting screw 222 faces the test ring mounting plate 24, the translation of the test ring mounting plate 24 is realized by adjusting the adjusting screw 222, the displacement testing mechanism 23 is a displacement sensor, the U-shaped limiting plate 211, the adjusting screw 222 and the test ring mounting plate 24 are on the same horizontal plane.

[0031] As shown in Figure 1 , Figure 5 and Figure 6 , the upper end surface of the test ring 5 is provided with a pressure guiding hole 51, and the lower surface is provided with a mounting hole 52, the pressure guiding hole 51 and the mounting hole 52 are communicated, the mounting hole 52 is provided with a pressure sensor 53 for testing the gas film pressure, the inner diameter of the test ring 5 is smaller than the inner diameter of the test static ring 4, and the outer diameter of the test ring 5 is greater than the outer diameter of the test static ring 4.

[0032] As shown in Figure 1 and Figure 6 , the lower end of the static ring mounting mechanism 13 is provided with a test static ring 4, the upper surface of the test static ring 4 and the static ring seat 131 and the static ring inner clamping seat 132 form a throttling air chamber 6, the test static ring 4, the test ring 5 and the static ring inner clamping seat 132 form an air flow inner cavity, and the lower end of the sealing cavity 35, the lower end of the static ring mounting mechanism 13, the upper surface of the translatable test ring assembly 2, the outer side of the test static ring 4 and the outer side of the test ring 5 form an air flow outer cavity.

[0033] Example 1

[0034] When the test static ring 4 is as shown in Figure 4The static pressure type stationary ring shown has a throttling orifice 42 at its lower end and a vent 41 at its other end. The vent 41 and the throttling orifice 42 are connected. The stationary ring mounting mechanism 13 and the sealing cavity 35 have a connected air intake channel on their sides. The air intake channel is connected to the throttling air cavity 6. The airflow enters from the air intake channel and passes through the throttling air cavity 6, the vent 41 of the static pressure type stationary ring, the throttling orifice 42 and the sealing gap in sequence into the airflow outer cavity and the airflow inner cavity, and flows out from the air outlet channel on the side of the sealing cavity 35 and the air outlet of the test ring 5, respectively.

[0035] Example 2

[0036] When the test static ring 4 is as follows Figure 7 The dynamic pressure stationary ring shown does not require a connecting air intake channel on the side of the stationary ring mounting mechanism 13 and the sealing cavity 35. The lower end face of the dynamic pressure stationary ring is provided with a shallow groove 43. The airflow enters the airflow outer cavity, the shallow groove 43 on the lower end face of the dynamic pressure stationary ring and the airflow inner cavity in sequence from the air intake channel on the lower end side of the sealing cavity 35, and then flows out from the air outlet of the test ring 5.

Claims

1. A device for testing the film pressure distribution across the entire end face of a dry gas seal under zero-speed conditions, characterized in that... The assembly includes a rotatable stationary ring assembly (1) and a translatable test ring assembly (2). The rotatable stationary ring assembly (1) is fixed on a fixed frame (3). The rotatable stationary ring assembly (1) is connected to the translatable test ring assembly (2). The lower end of the rotatable stationary ring assembly (1) is embedded with a test stationary ring (4). The upper surface of the translatable test ring assembly (2) is embedded with a test ring (5). The lower end face of the test stationary ring (4) and the upper end face of the test ring (5) form an airflow cavity. The upper end face of the test stationary ring (4) and the rotatable stationary ring assembly (1) form a throttling air cavity (6). The rotatable stationary ring assembly (1) drives the test stationary ring (4) to rotate on the upper surface of the test ring (5). The translatable test ring assembly (2) drives the test ring (5) to translate relative to the test stationary ring (4) to achieve full-end membrane pressure testing. The test stationary ring (4) is either a static pressure type stationary ring or a dynamic pressure type stationary ring. When the test stationary ring (4) is a static pressure type stationary ring, the stationary ring mounting mechanism (13) and the sealing cavity (35) are provided with a connected air intake channel. The air intake channel is connected to the throttling air cavity (6). The airflow enters from the air intake channel and passes through the throttling air cavity (6), the air vent (41) of the static pressure type stationary ring, the throttling hole (42) and the sealing gap in sequence into the airflow outer cavity and the airflow inner cavity, and flows out from the air outlet channel on the side of the sealing cavity (35) and the air outlet of the test ring (5) respectively. When the test stationary ring (4) is a dynamic pressure type stationary ring, the airflow enters from the air intake channel on the side of the sealing cavity (35) in sequence into the airflow outer cavity, the shallow groove (43) on the lower end face of the dynamic pressure type stationary ring and the airflow inner cavity, and then flows out from the air outlet of the test ring (5). The movable test ring assembly (2) includes a limiting mechanism (21), a moving drive mechanism (22), a displacement testing mechanism (23), and a test ring mounting plate (24). The test ring (5) is mounted on the test ring mounting plate (24), and the universal bearing (34) is located below the test ring mounting plate (24). The limiting mechanism (21) is installed on both sides of the test ring mounting plate (24) along the vertical moving direction to limit the test ring mounting plate (24) during the translation process. The moving drive mechanism (22) and the displacement testing mechanism (23) are installed on one or both sides of the test ring mounting plate (24) along the moving direction. The limiting mechanism (21) includes a U-shaped limiting plate (211), a first fixed upright plate (212), and a threaded adjusting rod (213). One end of the threaded adjusting rod (213) passes through the first fixed upright plate (212) and is threadedly connected to the first fixed upright plate (212) vertically. The end is fixedly connected to the U-shaped limiting plate (211), the opening of the U-shaped limiting plate (211) faces the test ring mounting plate (24), the first fixed plate (212) is vertically fixed on the base plate (31), and the distance between the two U-shaped limiting plates (211) is adjusted by adjusting the threaded adjusting rod (213) to fix the test ring mounting plate (24). The moving drive mechanism (22) includes the second fixed plate (221) and the adjusting screw (222). The adjusting screw (222) is threadedly connected to the second fixed plate (221), and one end of the adjusting screw (222) faces the test ring mounting plate (24). The test ring mounting plate (24) is translated by adjusting the adjusting screw (222). The displacement testing mechanism (23) is a displacement sensor. The U-shaped limiting plate (211), the adjusting screw (222) and the test ring mounting plate (24) are on the same horizontal plane.

2. The dry gas seal full-end membrane pressure distribution testing device under zero-speed conditions as described in claim 1, characterized in that... The fixed frame (3) includes a base plate (31), a support column (32), a top panel (33), a universal bearing (34), and a sealing cavity (35). The support column (32) is used to support and connect the base plate (31) and the top panel (33). The universal bearing (34) is fixed on the base plate (31) and is located below the movable test ring assembly (2). The sealing cavity (35) is fixed below the top panel (33). The rotatable stationary ring assembly (1) is fixed on the top panel (33). The sealing cavity (35) is located outside the rotatable stationary ring assembly (1). At the same time, the lower end of the sealing cavity (35) is connected to the movable test ring assembly (2). The lower end of the sealing cavity (35), the upper surface of the movable test ring assembly (2), the outer side of the test stationary ring (4), and the outer side of the test ring (5) form an airflow outer cavity.

3. The dry gas seal full-end membrane pressure distribution testing device under zero-speed conditions as described in claim 2, characterized in that... The rotatable stationary ring assembly (1) includes a rotation drive assembly (11), a pressure regulating chamber (12), and a stationary ring mounting mechanism (13). The rotation drive assembly (11) is fixed on the top plate (33). The lower end of the rotation drive assembly (11) is connected to the pressure regulating chamber (12). The pressure regulating chamber (12) is located below the top plate (33). The lower end of the pressure regulating chamber (12) is connected to the stationary ring mounting mechanism (13). The lower end of the stationary ring mounting mechanism (13) is used to install the test stationary ring (4). The sealing cavity (35) is used to seal the pressure regulating chamber (12) and the stationary ring mounting mechanism (13). The inner wall of the sealing cavity (35) is in contact with the stationary ring mounting mechanism (13).

4. A dry gas seal full-end membrane pressure distribution testing device under zero-speed conditions as described in any one of claims 1-3, characterized in that... The upper end face of the test ring (5) is provided with a pressure tapping hole (51), and the lower surface is provided with a mounting hole (52). The pressure tapping hole (51) and the mounting hole (52) are connected. The mounting hole (52) is equipped with a pressure sensor (53) for testing the air film pressure. The inner diameter of the test ring (5) is smaller than the inner diameter of the test stationary ring (4), and the outer diameter of the test ring (5) is larger than the outer diameter of the test stationary ring (4).

5. The dry gas seal full-end film pressure distribution testing device under zero-speed conditions as described in claim 4, characterized in that... The pressure regulating chamber (12) includes a pressure regulating chamber body (121) and a pressure regulating chamber lower plate (122). The pressure regulating chamber body (121) and the pressure regulating chamber lower plate (122) are connected by a pin and sealed by an auxiliary sealing ring. An air inlet is provided on the pressure regulating chamber body (121), which is connected to an external gas pipeline. By changing the pressure of the gas medium in the pressure regulating chamber (12), the load on the test stationary ring (4) is adjusted, thereby changing the thickness of the air mold between the end faces of the test stationary ring (4) and the test ring (5). The mounting mechanism (13) includes a stationary ring seat (131), a stationary ring inner clamping seat (132), and a stationary ring seat upper plate (133). The upper surface of the stationary ring seat upper plate (133) is connected to the lower plate (122) of the pressure regulating chamber. The stationary ring inner clamping seat (132) and the stationary ring seat (131) are respectively fastened to the stationary ring seat upper plate (133) by fasteners. The stationary ring inner clamping seat (132) is embedded in the stationary ring seat (131) and presses the test stationary ring (4) into the stationary ring seat (131).

6. The dry gas seal full-end membrane pressure distribution testing device under zero-speed conditions as described in claim 4, characterized in that... The rotation drive assembly (11) includes a rotating connecting rod (111), a rotating platform (112), and a cylindrical rotating component (113). The rotating platform (112) is fixed above the top plate (33). The rotating connecting rod (111) passes through the rotating platform (112) and is connected to the cylindrical rotating component (113). A handwheel is provided on the rotating platform (112). By rotating the handwheel, the rotating connecting rod (111) rotates. The cylindrical rotating component (113) is connected to the pressure regulating chamber (12). The circumferential transmission between the cylindrical rotating component (113) and the pressure regulating chamber (12) is realized by a transmission pin. The circumferential transmission between the pressure regulating chamber (12) and the upper plate (133) of the stationary ring seat is realized by a transmission pin.

7. The dry gas seal full-end membrane pressure distribution testing device under zero-speed conditions as described in claim 6, characterized in that... A flexible scale is provided on the upper plate (133) of the stationary ring seat, and a viewing hole is provided at the same horizontal plane as the sealing cavity (35) and the upper plate (133) of the stationary ring seat for reading the scale of the upper plate (133).

8. The dry gas seal full-end film pressure distribution testing device under zero-speed condition as described in claim 6, characterized in that... A thrust bearing (7) is provided between the upper end face of the pressure regulating cavity (121) and the lower end face of the upper panel (33). The thrust bearing (7) is located outside the cylindrical rotating part (113). During rotation, the upper ring of the thrust bearing (7) remains stationary with the upper panel (33), while the lower ring of the thrust bearing (7) rotates with the pressure regulating cavity (121).

Images