High-speed compressor dry gas seal critical working condition test bed

Abstract

The invention discloses a high-speed compressor dry gas seal critical working condition test bench, which is characterized in that a drive motor drives a speed increasing box and a bearing box, the speed increasing box is used for increasing the rotating speed of a main shaft in the bearing box, and the main shaft of the bearing box is connected with a dry gas seal element and an environment simulation mechanism; a dry gas sealing agent is wrapped in the environment simulation mechanism, the working condition of the dry gas sealing element during real working is simulated, and a plurality of sealing gas inlets in the environment simulation mechanism are communicated with external detection equipment, so that indexes such as internal pressure, flow velocity and temperature during rotation of the dry gas sealing element can be detected; after detection, the environment simulation mechanism is dismounted, and whether friction traces exist between the static ring seat and the moving ring seat on the dry gas sealing element or not can be observed, so that whether the product quality reaches the standard or not is judged.

Description

Technical Field

[0001] The invention belongs to the technical field of dry gas seal testing, and in particular relates to a critical working condition test bench for dry gas seals of high-speed compressors. Background Art

[0002] The dry gas seal is a non-contact shaft seal. It uses the principles of fluid dynamics to achieve non-contact operation of the sealing end face by opening a dynamic pressure groove on the sealing end face. The dry gas seal is composed of a rotating ring, a stationary ring, a spring seat, a shaft sleeve and other components. When the rotating ring rotates, the sealing gas is sucked into the dynamic pressure groove and flows along the groove. Dry gas seals are usually used in compressors. To ensure the quality of the compressor, it is necessary to perform performance testing on the dry gas seals. If the dry gas seal is simply driven to rotate by a motor, its performance indicators cannot be accurately tested, and there will be axial force when the dry gas seal is actually running in the equipment. Therefore, the axial force generated by the dry gas seal needs to be balanced and offset during testing to accurately detect the actual performance of the dry gas seal. Summary of the Invention

[0003] The purpose of the present invention is to provide a critical operating condition test bench for dry gas seal of high-speed compressor, which drives the speed increaser and bearing box through a driving motor, and utilizes the speed increaser to increase the rotation speed of the main shaft in the bearing box. The main shaft of the bearing box is connected to the dry gas seal and the environmental simulation mechanism. The dry gas sealant is wrapped inside by the environmental simulation mechanism and simulates the working conditions of the dry gas seal when it is actually working. The multiple sealing gas inlets on the environmental simulation mechanism are connected to the external detection equipment, which can detect the internal pressure, flow rate and temperature and other indicators of the dry gas seal when it rotates. The axial balance module in the environmental simulation mechanism simulates the operating environment of the dry gas seal after actual installation to offset the influence of the axial force on the dry gas seal.

[0004] The present invention is achieved through the following technical solutions: A high-speed compressor dry gas seal critical operating condition test bench includes a drive motor, a power transmission component and an environmental simulation mechanism. The power transmission component is connected to the drive motor and the environmental simulation mechanism respectively. The drive motor is used to provide power and drive the dry gas seal to rotate through the power transmission component. The dry gas seal is arranged in the environmental simulation mechanism, and its dynamic ring rotates following the rotation of the power transmission component; the environmental simulation mechanism is used to simulate the actual operating working condition environment of the dry gas seal and assist in detecting the motion data of the dry gas seal.

[0005] Preferably, the power transmission component includes a speed increaser and a bearing box. The speed increaser is arranged between the bearing box and the drive motor, and the two ends of the speed increaser are respectively connected to the drive motor and the bearing box through couplings; the main shaft in the bearing box is protruding at both ends of the bearing box shell, one end of the main shaft is connected to the coupling, and the other end extends into the environmental simulation mechanism and is connected to the dry gas seal; a flange is provided at one end of the bearing box close to the environmental simulation mechanism, and the environmental simulation mechanism is connected to the bearing box through a flange.

[0006] Preferably, the environmental simulation mechanism includes a connecting assembly, a housing assembly, a sleeve and an axial balancing module; the connecting assembly is located between the housing assembly and the flange, the sleeve is sleeved on the main shaft, the dry gas seal and the axial balancing module are both sleeved on the sleeve, the dry gas seal is located between the connecting assembly and the axial balancing module, and the axial balancing module is used to balance the axial force generated by the dry gas seal.

[0007] Preferably, the connection assembly includes a connection cover and an O-ring, wherein the O-ring is arranged on the end surface of the connection cover and is located between the connection cover and the flange; the other end of the connection cover is connected to the housing assembly.

[0008] Preferably, the shell assembly includes an outer shell and a protective cover, one end of the outer shell is connected to the connecting cover, and the protective cover is arranged at the other end of the outer shell, and the outer shell is provided with a first-level sealed air inlet, a second-level sealed air inlet, a first-level leakage air outlet and an exhaust port; the end of the connecting cover covers the second-level sealed air inlet, and the connecting cover is provided with a through hole, which is connected to the second-level sealed air inlet.

[0009] Preferably, the sleeve is a cylindrical structure, the inner diameter of the end of the sleeve close to the flange is larger than the inner diameter of the end away from the flange, the inner surface of the sleeve is a bevel structure and is arranged in contact with the main shaft, and the outer surface is a plane structure; a compression sleeve and a locking nut are provided at the end of the main shaft, the compression sleeve is provided on the main shaft and connected to the end face of the sleeve for fixing the sleeve, the locking nut is provided behind the compression sleeve and abuts against the compression sleeve, and the locking nut is used to limit the axial position of the sleeve.

[0010] Preferably, a limiting fold is provided on one end of the shaft sleeve close to the flange, and the limiting fold is used to limit the axial position of the dry gas seal.

[0011] Preferably, the axial balancing module includes a stationary ring seat, a dynamic ring seat and a friction pair, the friction pair is arranged between the stationary ring seat and the dynamic ring seat, the dynamic ring seat is sleeved on the shaft sleeve and arranged close to the dry gas seal, the stationary ring seat is sleeved on the compression sleeve, and its edge is connected to the outer shell.

[0012] Preferably, a gasket is provided between the dynamic ring seat and the dry gas seal.

[0013] Preferably, an exhaust cavity is provided between the stationary ring seat and the protective cover, and the exhaust cavity is communicated with the exhaust port on the outer shell.

[0014] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1) In the present invention, a speed increasing box and a bearing box are driven by a driving motor, and the speed increasing box is used to increase the rotation speed of the main shaft in the bearing box. The main shaft of the bearing box is connected to the dry gas seal and the environmental simulation mechanism. The dry gas sealant is wrapped inside by the environmental simulation mechanism and simulates the working environment of the dry gas seal when it is actually working. The multiple sealing gas inlets on the environmental simulation mechanism are connected to the external detection equipment, which can detect the internal pressure, flow rate and temperature and other indicators of the dry gas seal when it rotates. After the detection, the environmental simulation mechanism is removed to observe whether there are friction marks between the static ring seat and the dynamic ring seat on the dry gas seal to determine whether the product quality meets the standards.

[0015] 2) In the present invention, an axial balancing module is provided in the environmental simulation mechanism. The axial balancing module can simulate the operating environment of the dry gas seal after actual installation to offset the influence of the axial force on the dry gas seal, thereby truly restoring the operating conditions of the dry gas seal and providing accurate detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a schematic diagram of the assembly structure of the critical operating condition test bench for dry gas seal of a high-speed compressor of the present invention.

[0018] Figure 2 It is a schematic cross-sectional structure diagram of the environmental simulation mechanism in the present invention.

[0019] Among them: 1-drive motor, 2-speed increaser, 3-bearing box, 31-flange, 32-spindle, 4-environmental simulation mechanism, 5-connecting cover, 51-through hole, 6-housing, 61-first-level sealing gas inlet, 62-second-level sealing gas inlet, 63-first-level leakage gas outlet, 64-exhaust port, 65-protective cover, 7-sleeve, 71-limiting folding edge, 72-compression sleeve, 73-locking nut, 8-dry gas seal, 9-axial balancing module, 91-dynamic ring seat, 92-friction pair, 93-static ring seat, 10-washer. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0021] Example 1: A high-speed compressor dry gas seal critical working condition test bench, such as Figure 1 and Figure 2 As shown, it includes a drive motor 1, a power transmission component and an environmental simulation mechanism 4. The power transmission component is connected to the drive motor 1 and the environmental simulation mechanism 4 respectively. The drive motor 1 is used to provide power and drive the dry gas seal 8 to rotate through the power transmission component. The dry gas seal 8 is arranged in the environmental simulation mechanism 4, and its dynamic ring rotates along with the rotation of the power transmission component. The environmental simulation mechanism 4 is used to simulate the actual operating environment of the dry gas seal 8 and assist in detecting the motion data of the dry gas seal 8. The environmental simulation mechanism 4 is connected to an external detection device. The detection device includes components such as an air flow sensor, a temperature sensor and a pressure sensor for detecting the temperature, pressure and air flow rate of the dry gas seal 8 when rotating; the power transmission component includes a speed increaser 2 and a bearing box 3. The speed increaser 2 is arranged between the bearing box 3 and the drive motor 1. The two ends of the speed increaser 2 are connected to the drive motor 1 and the bearing box 3 respectively through a coupling. A gear set is provided in the speed increaser 2 for increasing the speed of the main shaft 32 in the rear end bearing box 3; the main shaft 32 in the bearing box 3 is at both ends of the bearing box 3 shell The protruding setting is that one end of the main shaft 32 is connected to the coupling, and the other end extends into the environmental simulation mechanism 4 and is connected to the dry gas seal 8 and drives the dynamic ring of the dry gas seal 8 to rotate; the bearing box 3 is provided with a flange 31 at one end close to the environmental simulation mechanism 4, and the environmental simulation mechanism 4 is connected to the bearing box 3 through the flange 31; the environmental simulation mechanism 4 includes a connecting component, a shell component, a sleeve 7 and an axial balance module 9; the connecting component is located between the shell component and the flange 31, the sleeve 7 is sleeved on the main shaft 32, the dry gas seal 8 and the axial balance The modules 9 are all sleeved on the shaft sleeve 7, and the dry gas seal 8 is located between the connecting assembly and the axial balancing module 9. The axial balancing module 9 is used to balance the axial force generated by the dry gas seal 8. When the dynamic ring of the dry gas seal 8 rotates, an axial force in the direction of the bearing box 3 will be generated on the shaft sleeve 7. The axial balancing module 9 is sleeved on the shaft sleeve 7 and rotates with the shaft sleeve 7. When the axial balancing module 9 rotates, an opposite axial force is generated to offset the axial force of the dry gas seal 8, thereby ensuring that the dry gas seal 8 can rotate smoothly on the main shaft 32 of the bearing box 3.

[0022] The connecting assembly includes a connecting cover 5 and an O-ring. The O-ring is arranged on the end face of the connecting cover 5 and is located between the connecting cover 5 and the flange 31. The connecting cover 5 is connected to the flange 31 of the bearing box 3 by bolts, and the other end of the connecting cover 5 is connected to the housing assembly.

[0023] The shell assembly includes an outer shell 6 and a protective cover 65. The outer shell 6 is an irregular cylindrical structure. The main shaft 32, the sleeve 7, the dry gas seal 8 and the axial balance module 9 are arranged in the outer shell 6. One end of the outer shell 6 is connected to the connecting cover 5 by bolts. The protective cover 65 is arranged at the other end of the outer shell 6 and is also connected to the outer shell 6 by bolts; the outer shell 6 is provided with a first-level sealing gas inlet 61, a second-level sealing gas inlet 62, a first-level leakage gas outlet 63 and an exhaust port 64. The end of the connecting cover 5 covers the second-level sealing gas inlet 62. A through hole 51 is provided on the connecting cover 5, and the through hole 51 is connected to the second-level sealing gas inlet 62. The first-level sealing gas inlet 61, the second-level sealing gas inlet 62, the first-level leakage gas outlet 63 and the exhaust port 64 are all connected to the external detection device through pipelines. When the dry gas seal 8 rotates, the air flow rate, internal pressure and temperature are all fed back to the sensor of the detection device, and finally recorded by the host computer.

[0024] Example 2: This embodiment further defines the shaft sleeve 7 based on the above embodiment. Figure 2 As shown, the sleeve 7 is a cylindrical structure, and the inner diameter of the end of the sleeve 7 close to the flange 31 is larger than the inner diameter of the end away from the flange 31. Because the end of the main shaft 32 extending into the environmental simulation mechanism 4 is an irregular columnar structure, its end diameter is small, and the end close to the flange 31 has a large diameter, so the main shaft 32 needs to match its surface. The inner surface of the sleeve 7 is a bevel structure and is arranged to fit the main shaft 32, and its outer surface is a flat structure; a compression sleeve 72 and a locking nut 73 are provided at the end of the main shaft 32. The compression sleeve 72 is sleeved on the main shaft 32 and is connected to the end face of the sleeve 7 by screws for fixing the sleeve 7, and the locking nut 73 is provided. When the shaft sleeve 7 is in the state of being tightened, the locking nut 73 is used to lock the shaft 7 on the axial direction, so that the shaft sleeve 7 can be tightened on the main shaft 32 by squeezing the shaft sleeve 7 toward the flange 31. A limiting folded edge 71 is provided on the end of the shaft sleeve 7 close to the flange 31, and the limiting folded edge 71 is circumferentially protruding at the end of the shaft sleeve 7. The bottom of the dynamic ring of the dry gas seal 8 is in contact with the limiting folded edge 71, and the limiting folded edge 71 is used to axially limit one end of the dry gas seal 8.

[0025] Example 3: Based on the above embodiment, this embodiment further defines the axial balancing module 9, such as Figure 2As shown, the axial balancing module 9 includes a stationary ring seat 93, a dynamic ring seat 91, and a friction pair 92. The axial balancing module 9 is designed to simulate the dry gas seal 8 so that when it rotates, it generates a counter-axial force to balance the axial force of the dry gas seal 8. The friction pair 92 is disposed between the stationary ring seat 93 and the dynamic ring seat 91. The dynamic ring seat 91 is mounted on the shaft sleeve 7 and is located near the dry gas seal 8. The dynamic ring seat 91 rotates with the rotation of the shaft sleeve 7. The stationary ring seat 93 is mounted on the compression sleeve 72, and its edge is connected to the housing 6. The stationary ring seat 93 is in a stationary state. A gasket 10 is disposed between the dynamic ring seat 91 and the dry gas seal 8. The gasket 10 separates the dry gas seal 8 from the dynamic ring seat 91 of the axial balancing module 9, preventing the dynamic ring seat 91 of the axial balancing module 9 from rotating and generating frictional contact with the dry gas seal 8. An exhaust cavity is provided between the stationary ring seat 93 of the axial balancing module 9 and the protective cover 65. The exhaust cavity is connected to the exhaust port 64 on the housing 6. The other parts of this embodiment are the same as those of the above embodiment and will not be described again here.

[0026] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. used to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention 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. Therefore, they should not be understood as limiting the present invention.

[0027] Furthermore, the use of terms such as "horizontal" and "vertical" in the description of the present invention does not necessarily imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical" and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0028] It should also be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific contexts.

[0029] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A high-speed compressor dry gas seal critical working condition test bench, characterized in that: It includes a drive motor, a power transmission component and an environmental simulation mechanism. The power transmission component is connected to the drive motor and the environmental simulation mechanism respectively. The drive motor is used to provide power and drive the dry gas seal to rotate through the power transmission component. The dry gas seal is arranged in the environmental simulation mechanism, and its dynamic ring rotates following the rotation of the power transmission component; the environmental simulation mechanism is used to simulate the actual operating environment of the dry gas seal and assist in detecting the motion data of the dry gas seal.

2. The high-speed compressor dry gas seal critical operating condition test bench according to claim 1, characterized in that: The power transmission assembly includes a speed increaser and a bearing box. The speed increaser is arranged between the bearing box and the drive motor. The two ends of the speed increaser are respectively connected to the drive motor and the bearing box through couplings; the main shaft in the bearing box is protruded at both ends of the bearing box shell, one end of the main shaft is connected to the coupling, and the other end extends into the environmental simulation mechanism and is connected to the dry gas seal; a flange is provided at one end of the bearing box close to the environmental simulation mechanism, and the environmental simulation mechanism is connected to the bearing box through the flange.

3. The high-speed compressor dry gas seal critical operating condition test bench according to claim 2, characterized in that: The environmental simulation mechanism includes a connecting assembly, a housing assembly, a sleeve and an axial balancing module; the connecting assembly is located between the housing assembly and the flange, the sleeve is sleeved on the main shaft, the dry gas seal and the axial balancing module are both sleeved on the sleeve, the dry gas seal is located between the connecting assembly and the axial balancing module, and the axial balancing module is used to balance the axial force generated by the dry gas seal.

4. The high-speed compressor dry gas seal critical operating condition test bench according to claim 3, characterized in that: The connecting assembly includes a connecting cover and an O-ring. The O-ring is arranged on the end surface of the connecting cover and is located between the connecting cover and the flange. The other end of the connecting cover is connected to the shell assembly.

5. The high-speed compressor dry gas seal critical operating condition test bench according to claim 4, characterized in that: The shell assembly includes an outer shell and a protective cover, one end of the outer shell is connected to the connecting cover, and the protective cover is arranged at the other end of the outer shell. The outer shell is provided with a primary sealing gas inlet, a secondary sealing gas inlet, a primary leakage gas outlet and an exhaust port; the end of the connecting cover covers the secondary sealing gas inlet, and the connecting cover is provided with a through hole, which is connected to the secondary sealing gas inlet.

6. The high-speed compressor dry gas seal critical operating condition test bench according to claim 3, characterized in that: The sleeve is a cylindrical structure, the inner diameter of the end of the sleeve close to the flange is larger than the inner diameter of the end away from the flange, the inner surface of the sleeve is a sloped structure and is arranged in contact with the main shaft, and the outer surface is a flat structure; a compression sleeve and a locking nut are provided at the end of the main shaft, the compression sleeve is provided on the main shaft and connected to the end face of the sleeve for fixing the sleeve, the locking nut is provided behind the compression sleeve and abuts against the compression sleeve, and the locking nut is used to limit the axial position of the sleeve.

7. The high-speed compressor dry gas seal critical operating condition test bench according to claim 6, characterized in that: A limiting fold is provided on one end of the shaft sleeve close to the flange, and the limiting fold is used to limit the axial position of the dry gas seal.

8. The high-speed compressor dry gas seal critical operating condition test bench according to claim 6, characterized in that: The axial balancing module includes a stationary ring seat, a dynamic ring seat and a friction pair. The friction pair is arranged between the stationary ring seat and the dynamic ring seat. The dynamic ring seat is sleeved on the shaft sleeve and is arranged close to the dry gas seal. The stationary ring seat is sleeved on the compression sleeve and its edge is connected to the outer shell.

9. The high-speed compressor dry gas seal critical operating condition test bench according to claim 6, characterized in that: A gasket is provided between the dynamic ring seat and the dry gas seal.

10. The high-speed compressor dry gas seal critical operating condition test bench according to claim 6, characterized in that: An exhaust cavity is provided between the stationary ring seat and the protective cover, and the exhaust cavity is communicated with the exhaust port on the shell.

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