Drive with amplifier for safety valve with high driving moment

FIELD: machine building.

SUBSTANCE: invention relates to the drive with amplifier for the safety valve with high torque driven by motor via the gear, the motor simultaneously with the safety valve opening pretension the rate-caged mechanical energy accumulator connected with drive shaft of the safety valve, the accumulator after rate-caging removal returns the accumulated energy, at that safety valve closes. The motor output is connected with planetary gear, its output rotor is connected with drive shaft of the safety valve. The mechanical energy accumulator contains several cylindrical springs with double-side winding and straight ends, their number complies with number of the planetary gear wheels. Each of the said springs from one side is connected without possibility of rotation with the planetary gear wheel, and on the opposite side it is connected with casing of the drive with amplifier.

EFFECT: invention creates rather high drive moment ensuring reliable closing of valves upon power failure, decreases time of valves locking.

8 cl, 5 dwg

 

The invention relates to a drive amplifier for the pressure relief valve with a high driving torque in accordance with the restrictive part of the independent claim.

A relief valve, a so-called valve with the function of SAV, is used, for example, for automatic closing of the tube for supplying fuel or other hazardous environments. With injuries or in cases of accidents in which the actuator power fail due to energy supply, the valve automatically closes the fuel supply pipe. This is due to the fact that during operation of the valve opening at the same time pre-tensioned mechanical energy accumulator, typically a spring, the force of the tension acts on the valve mechanism. In the operating mode of the valve mechanism with the adjusting element is held in the open position, counteracting the spring force. At the expense required for actuation of valves high torques are used in hydraulic and pneumatic actuators amplifiers, which, however, burdened with a number of disadvantages. First of all it is necessary to call the high costs of production and maintenance as hydraulic units, and pneumatic devices, including their system of energy storage. Pneumat the ical battery energy double action needs for example, in the control system a minimum pressure of compressed air in the receiver. Secondly, there is a danger of freezing environments, in particular air, which for this reason must be largely drained. In addition, Pneumatics is one of the most expensive forms of energy. Last but not least significant is the role of requirements of ecological safety. In such installations and piping systems must be fully prevented leakage not only to ensure the reliability, but also to prevent contamination of soil by oil. In pneumatic installations in the event of discharge, inevitably the selection of compressed air lubricated.

For these reasons, already developed electric actuators amplifier with conservation of mechanical energy for safety valves, in which even the failure of the supply voltage is the reliable drive element until the locking valve. In the normal mode of operation the actuator with the amplifier powered by a motor with a cylindrical gear actuates the regulating element and at the same time charges the mechanical energy accumulator. As a mechanical energy accumulator are layered disc springs, which locking termopoloblenergo actions are held in tensioned position. This locking brake is used in case of an accident as a starter, and then the battery energy actuates the braking element by means of 3-way worm gear and ball drive spindle (see brochure Fa. SCHIEBEL, Vienna).

The disadvantage of this drive power is that it is suitable only for valves with a relatively small nominal diameters, in which the driving torque of the actuator does not exceed 2000 Nm. Valves with a nominal diameter of 300 mm require, however, the drive torques up to 5500 Nm. This is not currently known practical technical solutions.

According to the invention, the actuator for the safety valve with the features of independent claim has in contrast the advantage that it develops a sufficiently high driving torque, so that even valve with a nominal diameter greater than 200 mm when a power outage can be securely closed. In addition, according to the invention by the combination of the planetary transmission with the mechanical energy accumulator is achieved in much shorter time lock that is of extraordinary importance for the security of the system as a whole. This is achieved according to the invention due to the fact that the desired locking torque is generated in a certain measure the Ohm coil springs with double-sided winding and straight ends, located around the drive shaft parallel to its axis and is connected with the planetary gears of the planetary gear without turning. Due to this required the locking torque is distributed to a large number of individual mechanical energy accumulators, and this distribution is technically through the planetary gear. The advantage is that the accumulation of energy is produced by the torsion coil springs with double-sided material specifications, and not by changing the length of the compression spring. Due to this, the drive power can be performed in General is much more compact than traditional drives with the amplifier, for example, with only one compression spring. More than that referred to in the prior art mechanical energy storage electric efficiency contributes to increase the driving torque of the actuator when at the same time easy to use constructive size of the drive.

In accordance with a preferred embodiment of the invention, the output of the engine is connected to a planetary gear with at least one notch transfer. Due to this torque and the rotation of the planetary gear can be very precisely aligned with the terms of the NCD is estremo on the safety relief valve locking.

In accordance with a preferred embodiment of the invention the driving motor is a geared motor. Due to this, may be the reduced number of degrees of transmission, which should change the speed and/or torque of a drive motor, and thus reduced the constructive dimensions of the drive amplifier.

In accordance with another preferred embodiment of the invention a cylindrical spring with bilateral wrapped and straight ends are elongated axes of the planetary gears. Due to this possible connection between the cylindrical spring and the planetary gear by the shortest distance and especially compact design of the drive amplifier.

In accordance with another preferred embodiment of the invention in a cylindrical wheel, causing the Central shaft of the planetary gear, a finger extending from the end surface in the axial direction, and the housing provides a springing focus, which rests against the finger. Due to this slowing down and limited rotational movement of the Central shaft and, consequently, the output of the hollow shaft of the drive amplifier.

Further advantages and preferred embodiments of the invention made it clear from the following description, che is of payments and claims.

An example embodiment of the invention represented in the drawings and hereinafter described in more detail. In the drawings shown:

Fig. 1 - drive amplifier according to the invention, in section,

Fig. 2 - section a-a drive amplifier according to Fig. 1,

Fig. 3 is a view of the body of the actuator according to the second variant the execution of a drive motor,

Fig. 4 is a section along a - a drive amplifier according to Fig. 3,

Fig. 5 - section B-b of the drive amplifier in Fig. 3.

A drive amplifier according to the invention are accommodated in the housing, which consists of part 1 of the housing on the drive side, and part 2 of the casing on the discharge side. He is driven by a gear motor 3, the output pin which without the possibility of turning is the leading gear 4. Leading gear 4 is engaged with the cylindrical gear wheel 5, which is located on the Central shaft 6 of the drive amplifier. On the output side shaft 6 is driven sun gear 7, the perimeter of which is uniformly distributed planetary gear 8, which in turn are guided rotatably on the axis 9 of the springs. Axis 9 of the springs on the one hand rely on part 1 of the housing on the drive side and on the opposite side on the carrier 10, the planetary gear, which, in turn, relies on the shaft 6. On the axes 9 of the springs are Zilin the historical spring 11 with bilateral wrapped and straight ends, one end of which is firmly secured in part 1 of the housing on the drive side, and the opposite end of each secured in a respective planetary gear 8 almost at the height of the outer diameter of the axis 9 of the spring, so that the cylindrical spring 11 is connected with the corresponding planetary gear 8, as well as with part 1 of the housing on the drive side, without turning. With the planetary gears 8, in addition, is engaged crown wheel 12, to which prepracovan output rotor 13 with the output hollow shaft. Not presented here, the valve is screwed to the fixed to the output part 2 of the housing flange 15, and the drive shaft of the valve is connected with the output hollow shaft 14 of the drive amplifier without turning.

Fig. 3 shows a view of the body of the actuator in the second embodiment, the drive amplifier, where between the gear motor 3 and the planetary gear introduced two stages (4.1, 4.2, 5.1, 5.2) transmission. Details that this drive amplifier perform the same functions as in the first embodiment shown in Fig. 1 and Fig. 2 are denoted by the same reference position. Fig. 4 and Fig. 5 shows this variant implementation in the context.

Also in this embodiment, the drive amplifier is placed in the case, the cat is which consists of part 1 of the housing on the drive side, and part 2 of the casing on the discharge side. Gear motor 3, which drives the drive amplifier in this embodiment is located under parts 1, 2 buildings, so that, in General, possible shorter design. On the output axle gear motor 3 is leading gear 4.1, which is engaged with the cylindrical gear 4.2, on a shaft which in turn is leading gear 5.1, which is engaged with the cylindrical gear wheel 5.2, connected to the shaft 6 of the drive amplifier without turning. Leading gear 4.1 and 5.1, and the cylindrical gear 4.2 and 5.2 form a gear mechanism (Fig. 4). With this construction, the output shaft 6, on which sits a sun gear, is on the right. In the same way as in the first embodiment, on the circumference of the sun gear 7 are in engagement evenly distributed six planetary gears 8, which is supported rotatably on the axis 9 of the springs. Axis 9 of the springs on the one hand rely on part 1 of the housing and on the opposite side on the carrier 10, the planetary gear, which, in turn, relies on the shaft 6. On the axes 9 of the springs are cylindrical spring 11 with bilateral wrapped and straight ends, one of which is firmly secured in the drive part 1 of the housing and protivopul the s ' end firmly secured in the respective planetary gear 8 almost at the height of the outer diameter of the axis 9 of the spring, so that the cylindrical spring 11 is connected with the corresponding planetary gear 8 and on the opposite part 1 of the housing without a possibility of turning. The planetary gear 8, in addition, are in engagement with a crown gear 12, to which prepracovan output rotor 13 with the output hollow shaft. Not shown in Fig. 3-5, the valve is bolted to fixed on the output part 2 of the housing flange and the drive shaft of the valve is connected with the output hollow shaft 14 without turning.

In Fig. 3 and 5 show the spring stop 16, which is set out in part 1 of the housing on the drive side, and in this example is formed of disk springs. Convert to chain drive side part 1 of the housing end surface of the cylindrical gears 5.2 in the axial direction is the finger 17, which abuts against the stop 16. This finger is so positioned in the area of the outer circumference bevel gears 5.2 that he is at a small distance before completing half of the turnover of bevel gears 5.2 and, therefore, only half of the turnover of the shaft 6 abuts against the stop 16. This ensures a safe completion of the locking of the drive amplifier, i.e., prevents twisting of the cylindrical spring 11 in a direction opposite to the direction of NAT is available.

Under this option, the limitations of the locking valve all the details 4.1, 4.2, 5.1, 5.2, 7, 8, 10, 12 a drive mechanism located in the kinematic chain transfer torque gear motor 4 must be selected of such size that when the half rotation of the shaft 6, the valve was securely closed.

The following describes the operation of the amplifier.

When the drive Assembly with amplifier using the gear motor is pre-tensioned cylindrical springs with double-sided winding and straight ends, so from the very beginning is the minimum required drive torque. After that, the drive amplifier is connected with a closed safety valve. To open the safety valve and geared motor 3 through step 4, 5 transmission (Fig. 1) or intermediate steps 4.1, 4.2, 5.1, 5.2 transmission (Fig. 4), the sun gear 7, the planetary gear 8 and the crown gear 12 drives the output rotor 13. Due to this cylindrical springs 11 are simultaneously tightened until then, until you fully open the safety valve. Transmission or, respectively, intermediate level 4, 5, 4.1, 4.2, 5.1, 5.2 transmission, subsequent items 7, 8, 10, 12, the planetary gear, and a cylindrical spring 11 is made of such dimensions that the cylindrical spring 11 in this floor the position reaches its maximum tension of the moment. If the safety valve is fully open, a motor-holding brake is activated by an electrical signal, and a drive amplifier, and consequently, the safety valve will be so long maintained in that position that corresponds to the operation mode at the maximum flow rate until served this electrical signal. Locking the safety valve under normal operating conditions is achieved via the switching process, which releases the locking brake, and drives the gear motor 3, and a cylindrical spring 11 at the same time open to the minimum torque. On the contrary, the locking brake is released in the event of a disaster, when emergency stop or other damage, but in any case, when the power failure, automatically, so that the cylindrical spring 11 due to the missing resistance lock brakes themselves open, and with the planetary gears 8 and the crown gear 12 to drive the output rotor 13, which through its output hollow shaft 14 immediately closes the safety valve.

The progressive weakening of tension cylindrical springs 11 provides the inertia in the kinematic chain of the cylindrical spring 11 parts 4, 5, 4.1, 4.2, 5.1, 5.2, 7, 8, 10, 12 Corot is key transmission is similar to the principle of the flywheel, for their spontaneous work, thus providing a complete locking of the safety valve.

All presented in the description, the dependent claims and in the drawings distinctive features may be essential to the invention both individually and in any combination with each other.

A LIST of REFERENCE DESIGNATIONS

1 - Piece body-side drive

2 - Part housing with an output side

3 - Gear motor

4 - a Leading gear

4.1 - Leading gear

4.2 - Cylindrical gear

5 is a Cylindrical gear

5.1 - Leading gear

5.2 - Cylindrical gear

6 - Shaft

7 - Solar gear

8, the planetary gear

9 - Axis springs

10 - the planetary Carrier

11 is a Cylindrical spring with bilateral wrapped and straight ends

12 - Crown wheel

13 - Output rotor

14 - Output hollow shaft

15 - Flange

16 - Emphasis

17 - Finger

1. A drive amplifier for the pressure relief valve with high torque, which is driven through the gearbox from the engine, which upon opening of the safety valve at the same time pre-pulls coupled to the drive shaft of the safety valve and arretium mechanical battery is ATOR energy, which after removal of the arresting again returns the stored energy and thus closes the safety valve, characterized in that
the output of the motor (3) is connected with the planetary gear, the output rotor (13) which is connected to the drive shaft of the safety valve, and
mechanical energy accumulator contains several coil springs (11) with bilateral wrapped and straight ends, the number of which corresponds to the number of planetary gears (8) and each of which is connected without turning on the one hand with one planetary gear (8), and on the opposite side from the housing (1) drive amplifier.

2. The drive amplifier under item 1, characterized in that the output of the motor (3) at least one step(4, 5, 4.1, 4.2, 5.1, 5.2) transmission is connected with the planetary gear(7, 8, 12, 13).

3. The drive amplifier under item 1 or 2, characterized in that the motor is a gear motor.

4. The drive amplifier under item 1 or 2, characterized in that the cylindrical spring (11) is located on the elongated axes (9) of the planetary gears (8).

5. A drive amplifier according to p. 3, characterized in that the cylindrical spring (11) is located on the elongated axes (9) of the planetary gears (8).

6. A drive amplifier according to any one of paragraphs.1, 2 or 5, characterized in that the fixed part is rivada steering is the stop (16), and performing in the process of locking the drive amplifier is not more than one turnover part of the drive mechanism (5.2) is the finger (17) which abuts on the stop (16) to end the process locking.

7. A drive amplifier according to p. 3, characterized in that the fixed part of the drive amplifier is the stop (16), and performs the process of locking the drive amplifier is not more than one turnover part of the drive mechanism (5.2) is the finger (17) which abuts on the stop (16) to end the process locking.

8. A drive amplifier for p. 4, characterized in that the fixed part of the drive amplifier is the stop (16), and performs the process of locking the drive amplifier is not more than one turnover part of the drive mechanism (5.2) is the finger (17) which abuts on the stop (16) to end the process locking.



 

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