An ultra-high pressure compact oil receiver

Abstract

The present invention discloses an ultra-high pressure compact oil receiver, comprising a support and a rotating shaft, the rotating shaft is arranged in the support for rotation around its own axis, an axial oil supply channel is arranged in the rotating shaft, a rolling bearing is arranged between the rotating shaft and the support, an oil pipe connected to the oil supply channel is arranged outside the support, a spring for pressing the support and the rotating shaft is arranged at one end of the support, and an axially sliding travel indicator rod is arranged in the oil supply channel of the rotating shaft. The present invention aims to provide an ultra-high pressure compact oil receiver with reduced pressure oil leakage and a more compact structure.

Description

Technical Field

[0001] The invention belongs to the field of water turbines, and in particular relates to an ultra-high pressure compact oil receiver. Background Art

[0002] Traditional turbine oil receivers all use a conventional pressure level of 6.3MPa. So far, the pressure level of large and medium-sized adjustable-paddle units in China has not exceeded 6.3MPa. Relevant patents include axial-flow propeller turbine oil receivers such as Chinese patent publication number CN205445874 U. This type of oil receiver has a fixed shell connected to an external oil pipe, and a sliding bearing or a rolling and sliding combination bearing is set between the internal rotating parts and the external parts. Due to the radial force during the operation of the unit, the internal rotating parts will bend. In order to avoid the rotating parts from bending and hitting the fixed shell, a larger gap needs to be set, which will cause a large pressure oil leakage. If the pressure oil level is increased to 16MPa or higher, the leakage caused by such a large gap will cause the oil receiver to fail and affect the safe operation of the unit. In order to solve the defects of conventional pressure oil receivers, the shell needs to be able to maintain linkage with internal components, such as Chinese patent publication No. CN203892102 U. The ultra-high pressure oil receiver of this patent adopts a sliding bearing structure. In order to reduce leakage, the sealing length is increased, which leads to an increase in the length of the oil receiver, a more complex structure, and an increase in the cost. Summary of the invention

[0003] The present invention is to overcome the above-mentioned deficiencies in the prior art and provides an ultra-high pressure compact oil receiver which reduces pressure oil leakage and has a more compact structure.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] An ultra-high pressure compact oil receiver includes a support and a rotating shaft, wherein the rotating shaft is arranged in the support to rotate around its own axis, an axial oil supply channel is arranged in the rotating shaft, a rolling bearing is arranged between the rotating shaft and the support, an oil pipe connected to the oil supply channel is arranged outside the support, a spring for pressing the support and the rotating shaft is arranged at one end of the support, and a stroke indicator rod with axial sliding fit is arranged in the oil supply channel of the rotating shaft. The rotating shaft is located in the support, and the rotating shaft is supported at the center of the oil receiver by the rolling bearing, and the rotation resistance is reduced at the same time. The support can well adapt to the bending deformation of the shaft system during the operation of the unit, avoid the occurrence of motion interference and eccentric compression leading to damage to the kinematic pair and increased oil leakage, and local overheating of the tile, and at the same time limit the axial position of the rotating shaft and the support, and the stroke indicator rod is used to obtain accurate information on the blade rotation angle. The axial displacement of the runner relay is separated from the rotating shaft, effectively shortening the length of the oil receiver, reducing the sealing length, and thus reducing the occurrence of oil leakage.

[0006] Preferably, a spring is provided at one end of the support to press the support and the rotating shaft, a locking screw is fixedly connected to one end of the rotating shaft, and a locking nut is provided on the locking screw to act on the spring to press the support. The spring firmly presses the support and the rotating shaft to ensure that there is always sufficient preload force to avoid relative sliding, absorb vibrations generated during operation, and further improve the stability of the operation process.

[0007] Preferably, a guide sleeve is provided between the stroke indicator rod and the oil supply channel of the rotating shaft, the inner end of the locking screw acts on the guide sleeve to press the rotating shaft, and the guide sleeve and the stroke indicator rod are slidably matched. When the stroke indicator rod moves, the guide sleeve supports, guides and lubricates it, ensuring that the stroke indicator rod moves accurately and stably along the axial direction.

[0008] Preferably, the stroke indicator rod axially penetrates the rotating shaft, the locking screw sleeve is arranged on the stroke indicator rod, and the inner wall of the rotating shaft is provided with a stepped surface for positioning the guide sleeve. In this way, when the locking screw sleeve is connected and tightened with the rotating shaft, the guide sleeve is also pressed and fixed to the rotating shaft, ensuring the coaxiality and axial positioning of the guide sleeve and the rotating shaft are accurate and reliable.

[0009] Preferably, the rolling bearing comprises a first bearing and a second bearing located at both ends of the rotating shaft, the outer side of the rotating shaft is provided with a shoulder axially positioned with the first bearing, and the spring acts on the second bearing to press the support and the rotating shaft. The elastic force of the spring pushes the second bearing to press the support, the first bearing and the rotating shaft, thereby reducing the gap between the rolling bearing and the support and the rotating shaft, reducing the rotation vibration and noise of the rotating shaft, and ensuring a smooth transmission process.

[0010] Preferably, the support is provided with a support oil port connected to the oil pipe, the inner wall of the support is provided with an annular oil groove connected to the support oil port, the rotating shaft is provided with a rotating shaft oil port corresponding to the position of the annular oil groove, and the rotating shaft oil port is connected to the oil supply channel. The support oil port, the annular oil groove and the rotating shaft oil port form an oil path from the oil pipe to the oil supply channel. During the rotation of the rotating shaft, the annular oil groove and the rotating shaft oil port are always connected, which is conducive to smooth oil supply and keeps the oil supply pressure of the oil supply channel stable.

[0011] Preferably, the support is provided with an anti-rotation bracket, which includes a first bracket body fixed to the support and a second bracket body arranged at an angle to the first bracket body, and the second bracket body is movably connected to the first bracket body. When the oil receiver is working, due to the internal friction of the oil or the presence of large particles in the oil filling the sealing gap, a rotation torque will be transmitted to the support when the rotating shaft rotates. The anti-rotation bracket can smoothly transmit the rotation torque on the support to the foundation to avoid damage to the equipment caused by the rotation torque.

[0012] Preferably, a joint bearing is provided between the first bracket body and the second bracket body. By providing the joint bearing, the swing of the shaft system can be adapted, and the rotation torque can be transmitted to the foundation without affecting the swing of the shaft system, thereby limiting the rotation of the support.

[0013] The beneficial effects of the present invention are as follows: (1) the length of the oil receiver and the required sealing length can be effectively shortened, so that the overall structure of the oil receiver is compact and the cost is reduced; (2) the radial clearance between the rotating shaft and the support can always be uniform, avoiding the adverse effect of rotating eccentric oil extraction caused by inconsistent radial clearance when the sliding bearing oil receiver structure is bent; (3) the support is fixed to the rotating shaft through a rolling bearing by a spring, which can absorb vibration during operation and ensure that the support can move with the axis when it is bent, avoiding interference of the movement of rotating parts; (4) the rotational movement and axial movement of the rotating shaft are separated, further reducing the leakage of the oil receiver sealing gap. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention.

[0015] In the figure: rotating shaft 1, oil supply channel 1a, rotating shaft oil port 1b, anti-rotation bracket 2, first bracket body 2a, spherical bearing 2b, second bracket body 2c, support 3, annular oil groove 3a, support oil port 3b, shaft shoulder 3c, second bearing 4a, first bearing 4b, spring 5, locking nut 6, locking screw 7, guide sleeve 8, oil pipe 9, stroke indicator rod 10. DETAILED DESCRIPTION

[0016] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0017] like Figure 1 In the illustrated embodiment, an ultra-high pressure compact oil receiver includes a support 3 and a rotating shaft 1. A through hole for accommodating the rotating shaft 1 is provided at the center of the support 3. The rotating shaft 1 is arranged in the through hole of the support 3 and can rotate around its own axis. A rolling bearing is provided between the rotating shaft 1 and the support 3. The rolling bearing includes a first bearing 4b and a second bearing 4a located at both ends of the rotating shaft 1. The first bearing 4b is provided at the left end of the rotating shaft 1, and the second bearing 4a is provided at the right end of the rotating shaft 1. A shoulder 3c for axial positioning with the first bearing 4b is provided on the outer side surface of the left end of the rotating shaft 1, and a positioning surface for axial positioning with the second bearing 4a is provided at the right end of the rotating shaft 1.

[0018] The right end of the support 3 is provided with a spring 5 and a locking screw 7, wherein the inner end of the locking screw 7 is provided with an external thread, which can be fixed with the internal thread of the rotating shaft 1. A locking nut 6 is provided on the locking screw 7, and the locking nut 6 is threadedly matched with the locking screw 7. When the locking nut 6 is tightened, it acts on the spring 5, and the spring 5 acts on the second bearing 4a. In this embodiment, the first bearing 4b and the second bearing 4a both use angular contact ball bearings, and the pressure of the spring 5 pushes the second bearing 4a to the left rotating shaft 1, and the first bearing 4b is positioned by the shoulder 3c, so that the support 3 and the rotating shaft 1 are kept in a compressed state.

[0019] An axial oil supply passage 1a is provided in the rotating shaft 1, and an axially sliding stroke indicator rod 10 is provided in the oil supply passage 1a of the rotating shaft 1. A guide sleeve 8 is provided between the stroke indicator rod 10 and the oil supply passage 1a of the rotating shaft 1, and the inner end of the locking screw 7 acts on the guide sleeve 8 to press the rotating shaft 1, and the guide sleeve 8 and the stroke indicator rod 10 are slidingly matched. The stroke indicator rod 10 passes through the rotating shaft 1 axially, and the locking screw 7 is sleeved on the stroke indicator rod 10. The inner wall of the rotating shaft 1 is provided with a stepped surface for positioning the guide sleeve 8. The stroke indicator rod 10 can move relative to the axis of the rotating shaft 1, and the axial displacement of the runner servomotor is separated from the rotating shaft 1. The rotating shaft 1 no longer indicates the displacement of the servomotor, but feeds back the displacement to the oil receiver through the stroke indicator rod 10 to obtain accurate information on the blade angle, which is convenient for controlling the blade angle.

[0020] The support 3 is provided with an oil pipe 9 connected to the oil supply channel 1a on the outside, the support 3 is provided with a support oil port 3b connected to the oil pipe 9, the inner wall of the support 3 is provided with an annular oil groove 3a connected to the support oil port 3b, the rotating shaft 1 is provided with a rotating shaft oil port corresponding to the position of the annular oil groove 3a, and the rotating shaft oil port is connected to the oil supply channel 1a. When actually connected, the oil pipe 9 can be connected to the oil receiver through the SAE flange. The SAE flange has a smaller size, so it can be fixed on a smaller support 3, which can significantly reduce the size of the equipment. The SAE flange is connected to the governor oil pipeline through a high-pressure hose. The high-pressure hose can adapt to the bending deformation of the shaft system and the vibration of the unit during the operation of the unit to avoid pipeline damage. When the rotating shaft 1 rotates relative to the support 3, the rotating shaft oil port also rotates along the axial direction of the rotating shaft 1. The annular oil groove 3a is opened along the circumference of the inner wall of the oil supply channel 1a. The rotating shaft oil port is always located in the annular oil groove 3a during rotation, so that the rotating shaft oil port, the annular oil groove 3a and the support oil port 3b are always kept in a connected state.

[0021] The support 3 is provided with an anti-rotation support 2, which includes a first support body 2a fixed to the support 3 and a second support body 2c arranged at an angle to the first support body 2a, and the second support body 2c is movably connected to the first support body 2a. When the oil receiver is working, due to the internal friction of the oil or the large particles in the oil filling the sealing gap, the rotation torque generated when the rotating shaft 1 rotates will be transmitted to the support 3, and the rotation torque will shear the oil supply and discharge pipelines, pressure measurement pipelines and temperature measurement cables connected to the support 3. The second support body 2c of the anti-rotation support 2 is fixed on the foundation, which can well bear the rotation torque transmitted to the support 3. At least one joint bearing 2b is provided between the first support body 2a and the second support body 2c, so that the second support body 2c can have a certain relative swing amount relative to the first support body 2a, so as to adapt to the swing of the shaft system.

[0022] During the actual operation, the pressure oil passes through the support oil port 3b, the annular oil groove 3a and the rotating shaft oil port from the oil pipe 9 in sequence, and enters the oil supply channel 1a of the rotating shaft 1 for oil supply. The rotating shaft 1 rotates relative to the support 3 along its own axis. The first bearing 4b and the second bearing 4a at both ends of the rotating shaft 1 support the rotating shaft 1. During the rotation of the rotating shaft 1, the spring 5 maintains the preload between the support 3 and the rotating shaft 1, and absorbs the vibration during the operation, ensuring that the oil receiver works smoothly and reliably.

Claims

1. An ultra-high pressure compact oil receiver, characterized in that: It includes a support and a rotating shaft, which is arranged in the support to rotate around its own axis, an axial oil supply channel is provided in the rotating shaft, a rolling bearing is provided between the rotating shaft and the support, an oil pipe connected to the oil supply channel is provided outside the support, and an axial sliding stroke indicator rod is provided in the oil supply channel of the rotating shaft; a spring for pressing the support and the rotating shaft is provided at one end of the support, a locking screw is fixedly connected to one end of the rotating shaft, and a locking nut is provided on the locking screw for pressing the support with the spring; the rolling bearing includes a first bearing and a second bearing located at both ends of the rotating shaft, a shoulder for axial positioning with the first bearing is provided on the outer side of the rotating shaft, and the spring acts on the second bearing to press the support and the rotating shaft; a guide sleeve is provided between the stroke indicator rod and the oil supply channel of the rotating shaft, and a stepped surface for positioning the guide sleeve is provided on the inner wall of the rotating shaft.

2. The ultra-high pressure compact oil receiver according to claim 1, characterized in that: The inner end of the locking screw acts on the guide sleeve and the rotating shaft to press them tightly, and the guide sleeve and the stroke indicating rod are slidably matched.

3. The ultra-high pressure compact oil receiver according to claim 1, characterized in that: The stroke indicating rod axially penetrates the rotating shaft, and the locking screw is sleeved on the stroke indicating rod.

4. The ultra-high pressure compact oil receiver according to claim 1, characterized in that: The support is provided with a support oil port connected to the oil pipe, the inner wall of the support is provided with an annular oil groove connected to the support oil port, the rotating shaft is provided with a rotating shaft oil port corresponding to the position of the annular oil groove, and the rotating shaft oil port is connected to the oil supply channel.

5. The ultra-high pressure compact oil receiver according to claim 1, characterized in that: The support is provided with an anti-rotation bracket, which includes a first bracket body that is fixed to the support and a second bracket body that is arranged at an angle to the first bracket body, and the second bracket body is movably connected to the first bracket body.

6. The ultra-high pressure compact oil receiver according to claim 5, characterized in that: A joint bearing is arranged between the first bracket body and the second bracket body.

7. The ultra-high pressure compact oil receiver according to claim 4, characterized in that: The annular oil groove is opened along the circumference of the inner wall of the oil supply passage.

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