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Speed up series hydraulic coupler

key word:Heat exchange element


Product description

Speed up series hydraulic coupler

 

1. Introduction

1.1. Application

The speed increasing series of hydraulic couplers are YOT46-550, YOT51, YOT51A, YOT46 (CO16) and YOT46-508 hydraulic couplers. They are generally used in the electric speed regulating water supply units with 30% capacity and 50% capacity of 600MW units and 30% and 50% capacities of 300MW units.

1.2. Model meaning

YOT-**-##

YOT -- Code of YOT series hydraulic coupler

** -- nominal diameter of pump turbine (cm)

## -------- center distance of speed increasing gear (mm)

Example: YOT46-550 indicates that the serial code of this type of hydraulic coupler is YOT, the nominal diameter of pump turbine is 46cm, and the center distance of speed increasing gear is 550mm

1.3. Structural features

1.3.1. Structure description. The typical structure and classification of speed increase series hydraulic coupler are shown in Fig. 10-1 and table 10-1 respectively.

Table 10-1 structure classification of increasing speed series hydraulic coupling

Item YOT46-550 YOT51 YOT51A YOT46 YOT46-508
CO6
With speed increasing gear o o o o o
Adjusting scoop tube by mechanical transmission x o o o o
Adjusting scoop tube by hydraulic servo transmission o × x × ×
Working oil has inlet control valve o x x o o
Oil pump The working oil is centrifugal pump and the lubricating oil is gear oil pump o x × o o
Gear oil pump for working oil and lubricating oil x o o × ×
Input shaft rotating direction  (from the direction of power transmission) CCW CCW CCW CCW CCW
Output shaft rotating direction (from the direction of power transmission) CW CW CW CW CW
Efficiency% 95 95 95 95 95

Note: O indicates "yes" and "X" indicates "no"

The main part of the speed increasing series hydraulic coupler has a pair of speed increasing gears. The supporting bearings are half split sliding bearing with black gold bushing and bidirectional thrust bearing with self positioning pad. It has complete working oil, lubricating oil system and auxiliary oil pump. The working oil and lubricating oil pipelines are combined in one box, and the lower part of the box is the oil tank with compact structure. The power transmission between the hydraulic coupling and the motor and between the hydraulic coupling and the feed pump is completed by the flexible coupling, while the power transmission between the pump shaft of the hydraulic coupling and the turbine shaft of the hydraulic coupling is transmitted by the working oil. In the speed control system of hydraulic coupling, the actuator drives the scoop tube to move in the working cavity by hydraulic or mechanical means according to the control signal, so as to change the oil filling amount in the hydraulic coupler, and realize the stepless adjustment of the output speed

1.3.1.1. Oil circulation (see Figure 10-2). The same oil is used for working oil and lubricating oil. The main oil pump supplying working oil and lubricating oil is a gear oil pump or centrifugal pump and gear pump respectively, which is driven by the input shaft of hydraulic coupler. When the pump set is started, stopped and damaged, the lubricating oil of the pump set is supplied by the electric auxiliary lubricating oil pump.

The working oil circulation is composed of a closed cycle and an open cycle. The pressure oil supplied by the main oil pump enters the working oil closed circulation circuit through the sequence valve and supplies oil to the working chamber of the hydraulic coupler. The working oil of the hydraulic coupler is sucked out by the scoop pipe. Under the action of back pressure, the working oil flows to the working oil cooler and orifice plate through the scoop tube oil discharge chamber, and returns to the working chamber of the hydraulic coupler, forming a closed circulating circuit of the working oil. The excess working oil returns to the tank through the pressure reducing valve. When the hydraulic coupler working chamber is filled with less liquid, the surplus working oil will return to the oil tank

The setting of working oil and lubricating oil pressure is related to sequence valve and pressure reducing valve. If the working oil temperature rises to 160 ℃, the fusible plug will melt and the working chamber of hydraulic coupler will drain oil; If the fusible plug melts due to the short-time overheating of oil circulation (i.e. oil cooler failure or hydraulic coupler overload), the adjustment performance of hydraulic coupler will slightly change, such as the temperature of oil tank rises slightly, the acceleration process time slightly increases, but it can almost reach the maximum output power

The lubricating oil circulation is formed by the main oil pump output pressure oil through the check valve, the lubricating oil cooler and the double barrel switchable filter screen to the bearing points and gear lubrication points. The pressure of lubricating oil is regulated by sequence valve at about 0.25MPa. In order to ensure that each bearing has oil lubrication during the start-up, shutdown and failure of the hydraulic coupler, an electric auxiliary lubricating oil pump is set in the system to supply oil to the bearings before and after the main motor starts and stops. The auxiliary electric oil pump is driven by a motor to pump oil from the oil tank and supply oil to the lubricating oil circulation circuit through the check valve.

1.3.1.2. External oil supply. The lubricating oil of external equipment (i.e. motor, driven machine or coupling) is provided by the lubricating oil circuit of hydraulic coupler, and the total return oil returns to the oil tank. Orifice plates are installed on the lubricating oil outlet pipes of motor side and feed pump side of hydraulic coupler.

1.3.2. Description of important components. The hydraulic control mode and mechanical control mode of the scoop tube are shown in Fig. 10-3 and Fig. 10-4 respectively.

1.3.2.1. The scoop tube is used to adjust the liquid filling volume of the working chamber of the hydraulic coupler. Its position is adjusted by the electric actuator through adjusting the control shaft. Speed regulation: the scoop tube moves away from the oil ring surface in the working chamber, the amount of oil sucked from the scoop tube decreases, and the oil volume of the main oil pump fills the working chamber; deceleration adjustment: the scoop pipe moves into the oil ring surface, and the amount of oil sucked from the scoop pipe increases, and the oil is discharged into the oil tank through the pressure reducing valve.

1.3.2.2. The position of the scoop tube remains unchanged, and the oil flow required to eliminate heat loss depends on the adjustment position of the control valve. The rotation of the working oil in the rotating shell generates dynamic pressure at the end of the scoop tube, and the oil scooped up by the end of the scoop tube enters the working chamber through the scoop tube and the working oil cooler. The oil pumped by the charge pump increases the pressure in the control valve housing through the pressure retaining valve, which opens the pressure retaining valve, and the unsuitable oil returns to the oil tank, so that the oil flow into the working chamber is balanced.

1.3.2.3. The transmission control shaft is adjusted by adjusting the handle. A sector cylindrical gear is installed on the control shaft, which is meshed with the rack on the spoon tube. The scoop tube is installed in the scoop tube sleeve and positioned by the guide pin.

1.3.2.4. The electric actuator must be equipped with a stop device to limit the "maximum" and "minimum" positions of the scoop tube. Do not use the control device or scoop tube as a limit. During operation, do not loosen the actuator positioning element or disconnect the actuator, otherwise the movement of the scoop tube will damage the actuator and guide pin.

 

2. Main technical parameters and product appearance

2.1. Main technical parameters and performance curve

See Fig. 10-5 for main technical parameters and performance curve of speed increasing series hydraulic coupler.

2.2. Product appearance (see Fig. 10-6 ~ Fig. 10-8)

 

3. Selection method

When ordering the variable speed hydraulic coupling, the user should provide the following basic parameters:

3.1. Maximum output speed of prime mover (r/min).

3.2. Maximum output power of prime mover (kW).

3.3. The maximum input speed of the driven machine (r/min).

3.4. The maximum input power of the driven machine (kW).

3.5. Amount of lubricating oil required for external machinery.

3.6. Direction of rotation.

 

4. Scope of supply

Hydraulic coupler body, oil cooler, oil filter, oil system pipe fittings, coupling, pressure transmitter, etc.