Hydraulic dynamometer for underwater engine power output testing

Abstract

The present invention relates to the field of underwater engine power testing, and specifically to a hydraulic dynamometer for underwater engine power output testing. The present invention solves the technical problems that the main shaft rotor of the traditional hydraulic dynamometer is a solid structure and cannot meet the requirements for discharging waste gas and waste water during the underwater engine test, and the dynamic seal between the existing dynamometer and the main shaft rotor fails to seal after the rotor passes through high-temperature and high-pressure gas. The main shaft component of the present invention adopts a hollow main shaft to leave a discharge channel for waste gas and waste water; the rotor dynamic seal composed of a lip seal ring, a gasket, a collar, a retaining ring, and an O-ring is used to avoid the problem of seal failure after the rotor passes through high-temperature and high-pressure gas; the end dynamic seal structure is added to ensure the dynamic seal of the rotor end; a spline structure flange is used, one end is connected to the rotor main shaft flange, and the other end is a spline structure connected to the engine to be tested, and a channel required for discharging waste gas and waste water is left in the middle, which is convenient for the installation and disassembly of the engine to be tested.

Description

Technical Field

[0001] The invention relates to the field of underwater engine power testing, in particular to a hydraulic dynamometer used for underwater engine power output testing. Background Art

[0002] With the independent research and development of domestic underwater weapons / civilian engines, it is necessary to carry out various tests such as product performance development, calibration, matching, simulation, reliability and durability, and simulate the engine power performance test of underwater weapons / civilian engines on the test bench through the power loading device. As an important equipment for measuring engine power performance, the hydraulic dynamometer can cooperate with the engine to carry out various operating point transformation tests. It has the advantages of low unit cost, compact size, small inertia, fast transient response, and large load absorption. The main shaft rotor of the traditional hydraulic dynamometer is a solid structure, which cannot meet the requirements of exhaust gas and wastewater discharge during the test of underwater weapons / civilian engines. There is a lack of a hydraulic dynamometer that can be directly used for the power output of underwater weapons / civilian engines. Summary of the invention

[0003] The present invention aims to solve the technical problems that the main shaft rotor of the traditional hydraulic dynamometer is a solid structure and cannot meet the requirements for discharging exhaust gas and waste water during the underwater weapon engine test, and the dynamic seal between the existing dynamometer and the main shaft rotor fails after the rotor passes through high-temperature and high-pressure gas, resulting in leakage of the dynamometer working fluid and failure to meet the experimental requirements. A hydraulic dynamometer for underwater engine power output testing is provided to solve the technical problems that the main shaft rotor of the traditional hydraulic dynamometer is a solid structure and cannot meet the requirements for discharging exhaust gas and waste water during the underwater weapon engine test, and the dynamic seal between the existing dynamometer and the main shaft rotor fails after the rotor passes through high-temperature and high-pressure gas, resulting in leakage of the dynamometer working fluid and failure to meet the experimental requirements.

[0004] The present invention is implemented by adopting the following technical scheme: a hydraulic dynamometer for underwater engine power output test, comprising a base, left and right bearing seats installed on the base, left and right bearing shells installed outside the left and right bearing seats, a rotor shell installed between the left and right bearing shells, and a main shaft supported on the left and right bearing seats and passing through the rotor shells; a rotor installed on the main shaft is arranged in the rotor shell; the rotor shell is connected to the water inlet and outlet components; the main shaft and the left and right bearing shells are sealed by a main shaft rotor dynamic sealing structure; the main shaft is a hollow main shaft that passes through from front to back; the main shaft rotor dynamic seal is a pair, respectively located on the side of the left and right bearing seats facing the rotor shell; the main shaft rotor dynamic seal comprises a lip seal ring, a collar, a gasket, a retaining ring and a first An O-ring; the washer is sleeved on the main shaft and there is a gap between the inner surface of the washer and the main shaft, and the outer surface of the washer is sealed and connected to the inner wall of the bearing housing; a boss is provided at one end of the inner surface of the washer close to the bearing seat, and a groove is provided at one end of the inner surface of the washer away from the bearing seat, and the retaining ring is installed in the groove, the collar is sleeved on the inner surface of the washer close to the retaining ring, and the lip sealing ring is sleeved on the inner surface of the washer and is located between the collar and the boss of the washer; the end surface of the collar facing the lip sealing ring extends horizontally to the lip sealing ring, and the side of the lip sealing ring facing the collar boss is provided with an annular opening, and the inner surface of the lip sealing ring is pointed toward the main shaft, and the protruding part is in sealing contact with the main shaft; the horizontally extending part of the collar supports the pointed protrusion; a sealing groove is provided on the outer surface of the washer, and the first O-ring is installed in the sealing groove.

[0005] The main shaft component of the present invention adopts a hollow main shaft to leave a discharge channel for waste gas and waste water; the rotor dynamic seal composed of a lip seal ring, a gasket, a collar, a retaining ring, and an O-ring is adopted to avoid the problem of seal failure caused by the rotor passing through high-temperature and high-pressure gas.

[0006] Furthermore, an end dynamic seal is provided at the end of the main shaft; the end dynamic seal comprises an outer shell, a sealing static ring seat, a static sealing dynamic ring, a dynamic sealing ring, an end bearing, a second, third, fourth, fifth and sixth O-rings; the center of the outer shell is a cavity that passes through from front to back, the sealing static ring seat is a cylindrical structure that passes through from front to back and is nested in the middle and end section of the outer shell cavity, an annular limit plate is provided at the end opening of the outer shell cavity, the outer diameter of the front section of the sealing static ring seat is larger than the outer diameter of the middle and end sections, forming a limit step, there is a gap between the outer wall of the middle section of the sealing static ring seat and the inner wall of the outer shell, and a limit spring that is limited between the annular limit plate and the limit step is sleeved at the gap; the static sealing dynamic ring is arranged close to the front end face of the sealing static ring seat; the end bearing is mounted on the front end face of the outer shell The front end surface of the static seal dynamic ring extends forward to form an annular groove structure, the dynamic seal ring is a cylindrical structure with a central through-hole, the end of the dynamic seal ring extends from the front port of the outer shell and is fixedly connected to the inner ring of the end bearing, and the end surface of the dynamic seal ring is embedded in the annular groove structure of the static seal dynamic ring; the front end surface of the dynamic seal ring is connected to the end of the main shaft by bolts; the second O-ring is installed on the end surface of the outer shell, the third O-ring is installed between the inner wall of the limiting plate of the outer shell and the outer wall of the last section of the sealing static ring seat; the fourth O-ring is installed between the outer wall of the front section of the sealing static ring seat and the inner wall of the outer shell; the fifth O-ring is installed between the annular groove structure of the static seal dynamic ring and the outer wall of the dynamic seal ring; the sixth O-ring is installed on the front end surface of the dynamic seal ring.

[0007] The present invention adds a terminal dynamic sealing structure to ensure the dynamic sealing of the rotor terminal.

[0008] Furthermore, a spline structure flange is used, one end of which is connected to the rotor main shaft flange and the other end is connected to the engine to be tested by a spline structure, leaving a channel required for discharging exhaust gas and waste water in the middle, while facilitating the installation and disassembly of the engine to be tested.

[0009] The present invention solves the following technical problems: 1. The existing solid rotor of the dynamometer cannot meet the requirements of exhaust gas and wastewater discharge during the underwater weapon engine test, and a discharge channel is reserved for the exhaust gas and wastewater;

[0010] 2. The existing dynamic seal between the dynamometer and the main shaft rotor fails after the rotor passes through high-temperature and high-pressure gas, causing leakage of the dynamometer working fluid and failing to meet experimental requirements. The end dynamic seal structure adopted in the present invention solves the above technical problems well.

[0011] 3. The spline structure is adopted to facilitate the installation and disassembly of the engine to be tested while meeting the requirements for exhaust gas and wastewater discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic diagram of the structure of the hydraulic dynamometer of the present invention.

[0013] Figure 2Schematic diagram of rotor dynamic seal structure.

[0014] Figure 3 Schematic diagram of the end dynamic seal structure.

[0015] Figure 4 Schematic diagram of spline flange structure.

[0016] 1-base, 2-left bearing seat, 3-right bearing seat, 4-left bearing housing, 5-right bearing housing, 6-rotor housing, 7-spindle, 8-lip seal ring, 9-ring, 10-washer, 11-retaining ring, 12-first O-ring, 13-outer housing, 14-sealing static ring seat, 15-static sealing dynamic ring, 16-dynamic sealing ring, 17-end bearing, 18-nut, 19-second O-ring, 20-third O-ring, 21-fourth O-ring, 22-fifth O-ring, 23-sixth O-ring, 24-spline flange, 25-screw, 26-seventh O-ring, 27-valve, 28-limit spring. DETAILED DESCRIPTION

[0017] Example 1

[0018] like Figure 1 , 2As shown, a hydraulic dynamometer for underwater engine power output test comprises a base 1, left and right bearing seats mounted on the base 1, left and right bearing shells mounted outside the left and right bearing seats, a rotor shell 6 mounted between the left and right bearing shells, and a main shaft 7 supported on the left and right bearing seats and passing through the rotor shell 6; a rotor mounted on the main shaft 7 is arranged inside the rotor shell 6; the rotor shell 6 is connected with an inlet and outlet component; the main shaft 7 and the left and right bearing shells are sealed by a main shaft rotor dynamic seal structure; the main shaft 7 is a hollow main shaft that passes through the front and back; the main shaft rotor dynamic seal is a pair, which is respectively located on the side of the left and right bearing seats facing the rotor shell 6; the main shaft rotor dynamic seal comprises a lip seal ring 8, a collar 9, a gasket 10, a retaining ring 11 and a first O-ring 12; the gasket 10 is sleeved on the main shaft 7 and there is a gap between the inner surface of the gasket 10 and the main shaft 7, and the outer surface of the gasket 10 is spaced from the inner surface of the bearing shell The washer 10 is sealed with a wall; a boss is provided at one end of the inner surface of the gasket 10 close to the bearing seat, and a groove is provided at one end of the inner surface of the gasket 10 away from the bearing seat, and the retaining ring 11 is installed in the groove, and the collar 9 is closely sleeved on the inner surface of the gasket 10 against the retaining ring 11, and the lip seal ring 8 is sleeved on the inner surface of the gasket 10 and is located between the collar 9 and the boss of the gasket 10; the end surface of the collar 9 facing the lip seal ring 8 extends horizontally to the lip seal ring 8, and the lip seal ring 8 has an annular opening on the side facing the boss of the gasket 10, and the inner surface of the lip seal ring 8 has a pointed protrusion toward the direction of the main shaft 7, and the protruding part is in sealing contact with the main shaft 7 (the annular opening has a certain deformation ability, which can ensure that the main shaft is in close contact with the protruding part when it is stressed or rotated); the horizontal extension part of the collar 9 supports the pointed protrusion; a sealing groove is provided on the outer surface of the gasket 10, and the first O-ring 12 is installed in the sealing groove, which effectively prevents water in the rotor housing from leaking between the main shaft and the left and right bearing housings.

[0019] Example 2

[0020] like Figure 3As shown, the end of the main shaft 7 is provided with an end dynamic seal; the end dynamic seal comprises an outer shell 13, a sealing static ring seat 14, a static sealing dynamic ring 15, a dynamic sealing ring 16, an end bearing 17, a second, third, fourth, fifth and sixth O-rings; the center of the outer shell 13 is a cavity that passes through from front to back, the sealing static ring seat 14 is a cylindrical structure that passes through from front to back and is embedded in the middle and end section of the cavity of the outer shell 13, the end opening of the cavity of the outer shell 13 is provided with an annular limit plate, and the front section of the sealing static ring seat 14 is provided with a ring-shaped limit plate. The diameter is larger than the outer diameter of the middle and end sections, forming a limiting step. There is a gap between the outer wall of the middle section of the sealing static ring seat 14 and the inner wall of the outer shell 13. A plurality of limiting springs 28 limited between the annular limiting plate and the limiting step are sleeved in the gap (sleeved on the outer wall of the sealing static ring seat), so that the sealing static ring seat 14 can automatically adjust the force according to the axial movement of the main shaft to ensure sealing; the static sealing dynamic ring 15 is set close to the front end face of the sealing static ring seat 14; the end bearing 17 is installed on the front end face of the outer shell 13 The front end surface of the static seal dynamic ring 15 extends forward to form an annular groove structure, and the dynamic seal ring 16 is a cylindrical structure with a central through-hole. The end of the dynamic seal ring 16 extends from the front port of the outer shell 13 and is fixedly connected to the inner ring of the end bearing 17. At the same time, the end surface of the dynamic seal ring 16 is embedded in the annular groove structure of the static seal dynamic ring 15 to improve the sealing effect; the front end surface of the dynamic seal ring 16 is connected to the end of the main shaft 7 by bolts; the second O-ring 19 is installed on the end surface of the outer shell 13, and the third O-ring 20 is installed between the inner wall of the outer shell limit plate and the outer wall of the last section of the sealing static ring seat 14; the fourth O-ring 21 is installed between the outer wall of the front section of the sealing static ring seat 14 and the inner wall of the outer shell 13; the fifth O-ring 22 is installed between the annular groove structure of the static seal dynamic ring 15 and the outer wall of the dynamic seal ring 16; the sixth O-ring 23 is installed on the front end surface of the dynamic seal ring 16; the center of the main shaft 7, the dynamic seal ring 16 and the sealing static ring seat 14 constitutes a cavity for exhaust gas circulation.

[0021] Example 3

[0022] like Figure 4 As shown, a spindle flange is installed at the front end of the spindle 7, and the spindle flange is connected to a spline flange 24 through screws 25. The center of the spline flange 24 is a through hole that passes through the front and back, and a seventh O-ring 26 is fixed to the end surface where the spline flange 24 and the spindle flange are connected.

[0023] In specific application, the hydraulic dynamometer includes a head spline flange, a tail mechanical seal, a body component, a force measuring mechanism component, an inlet and outlet component, a drain valve component, and a lubrication component. The body components include a base, a left bearing seat, a right bearing seat, a main shaft component, a coupling, a bearing pressure plate, a mechanical seal, a sleeve, a bimetal sleeve, left and right bearing housings, left and right side housings, a screw plug, a rotor, a housing, a water sealing ring, a speed measuring gear, a speed sensor, an overflow pipe, and a cock. The spline flange 24 is connected to the engine to be tested through the splines thereon (the engine exhaust enters the main shaft from the engine shaft through the spline flange and the main shaft flange and is discharged from the outer housing); the end port of the outer housing 13 of the end dynamic seal is connected to the external exhaust gas recovery pipeline.

[0024] A water inlet is installed above the rotor housing 6, and a water outlet is installed below the rotor housing 6. Valves 27 are installed on the water inlet and outlet to form water inlet and water outlet components.

[0025] The lip seal ring 8 is made of high temperature resistant material to meet the requirements of high temperature and high speed of the rotor in the test.

Claims

1. A hydraulic dynamometer for testing the power output of an underwater engine, comprising a base (1), left and right bearing seats mounted on the base (1), left and right bearing shells mounted outside the left and right bearing seats, a rotor shell (6) mounted between the left and right bearing shells, and a main shaft (7) supported on the left and right bearing seats and passing through the rotor shell (6); a rotor mounted on the main shaft (7) is arranged inside the rotor shell (6); the rotor shell (6) is connected to a water inlet and outlet component; the main shaft (7) and the left and right bearing shells are sealed by a main shaft rotor dynamic seal structure; and the characteristics are as follows: The main shaft (7) is a hollow main shaft that passes through from front to back; the main shaft rotor dynamic seal is a pair, which are respectively located on the side of the left and right bearing seats facing the rotor housing (6); the main shaft rotor dynamic seal comprises a lip seal ring (8), a collar (9), a gasket (10), a retaining ring (11) and a first O-ring (12); the gasket (10) is sleeved on the main shaft (7) and there is a gap between the inner surface of the gasket (10) and the main shaft (7), and the outer surface of the gasket (10) is sealed and connected to the inner wall of the bearing housing; a boss is provided at one end of the inner surface of the gasket (10) close to the bearing seat, and a groove is provided at one end of the inner surface of the gasket (10) away from the bearing seat, and the retaining ring (11) is installed in the groove. The collar (9) is sleeved on the inner surface of the gasket (10) close to the retaining ring (11); the lip seal ring (8) is sleeved on the inner surface of the gasket (10) and is located between the collar (9) and the bosses of the gasket (10); the end surface of the collar (9) facing the lip seal ring (8) extends horizontally toward the lip seal ring (8); the side of the lip seal ring (8) facing the boss of the gasket (10) is provided with an annular opening; the inner surface of the lip seal ring (8) is protruded with a pointed tip toward the main shaft (7), and the protruding portion is in sealing contact with the main shaft (7); the horizontally extending portion of the collar (9) supports the pointed tip protrusion; the outer surface of the gasket (10) is provided with a sealing groove, and the first O-ring (12) is installed in the sealing groove; The end of the main shaft (7) is provided with an end dynamic seal; the end dynamic seal comprises an outer shell (13), a sealing static ring seat (14), a static sealing dynamic ring (15), a dynamic sealing ring (16), an end bearing (17), a second, a third, a fourth, a fifth and a sixth O-ring; the center of the outer shell (13) is a cavity that passes through from front to back, the sealing static ring seat (14) is a cylindrical structure that passes through from front to back and is embedded in the middle and end section of the cavity of the outer shell (13), and the end of the cavity of the outer shell (13) is The port is provided with an annular limit plate, the outer diameter of the front section of the sealing static ring seat (14) is larger than the outer diameter of the middle and end sections, forming a limit step, there is a gap between the outer wall of the middle section of the sealing static ring seat (14) and the inner wall of the outer shell (13), and a limit spring (28) is sleeved at the gap and is limited between the annular limit plate and the limit step; the static seal dynamic ring (15) is arranged close to the front end surface of the sealing static ring seat (14); the end bearing (17) is installed on the front end surface of the outer shell (13), and the static seal dynamic ring (15) is arranged close to the front end surface of the sealing static ring seat (14); the end bearing (17) is installed on the front end surface of the outer shell (13), and the static seal dynamic ring (15) is provided. ) extends forward to form an annular groove structure, the dynamic seal ring (16) is a cylindrical structure with a central through-hole, the end of the dynamic seal ring (16) extends from the front end of the outer shell (13) and is fixedly connected to the inner ring of the end bearing (17), and the end surface of the dynamic seal ring (16) is embedded in the annular groove structure of the static seal dynamic ring (15); the front end surface of the dynamic seal ring (16) is connected to the end of the main shaft (7) by bolts; the second O-ring (19) is installed On the end surface of the outer shell (13), a third O-ring (20) is installed between the inner wall of the outer shell limit plate and the outer wall of the end section of the sealing static ring seat (14); a fourth O-ring (21) is installed between the outer wall of the front section of the sealing static ring seat (14) and the inner wall of the outer shell (13); a fifth O-ring (22) is installed between the annular groove structure of the static sealing dynamic ring (15) and the outer wall of the dynamic sealing ring (16); and a sixth O-ring (23) is installed on the front end surface of the dynamic sealing ring (16); The end port of the outer shell (13) of the end dynamic seal is connected to an external exhaust gas recovery pipeline; a water inlet is installed above the rotor shell (6), and a water outlet is installed below the rotor shell (6), and valves (27) are installed on the water inlet and outlet; the lip seal (8) is made of high temperature resistant material.

2. The hydraulic dynamometer for underwater engine power output testing according to claim 1, characterized in that: A spindle flange is installed at the front end of the spindle (7), and the spindle flange is connected to a spline flange (24) through screws (25). The center of the spline flange (24) is a through hole that passes through the front and back. A seventh O-ring (26) is fixed to the end surface where the spline flange (24) and the spindle flange are connected.

3. The hydraulic dynamometer for underwater engine power output testing according to claim 2, characterized in that: The spline flange (24) is connected to the engine to be tested via the splines thereon.

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