RU2551255C2 - Injection screw - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: injection screw contains casing 3 having end face, rear and side walls 4, 5 and 6, screw rotors 1 and 2, output window made in the wall 4, input window 7 made in top part of the casing 3 in form of a throughput box element 9 with walls, inside which the injection screw productivity adjustment device is installed made in form of at least two connected shutters 14 installed with possibility of movement along the longitudinal axial line of the casing 3. The productivity adjustment device contains device for movement of the shutters 14 connected with each other by means of a flexible connection 17 with possibility of shutters 14 rotation relatively to each other around the axis at right angle to the longitudinal axial line of the casing 3 made in form of a wheel installed with possibility of rotation with rolling over shutters 14 and their consequential winding on the wheel. The wheel rolling axis is parallel to rotation axes of the shutters 14, on it one of the outmost shutters 14 located from wall 5 side and drive tie-rod are rigidly secured.

EFFECT: increased efficiency of adjustment of air supply and pressure at inlet of the internal-combustion engine.

9 cl, 11 dwg

Description

The invention relates to the field of power engineering, and in particular to hydraulic volume displacement machines with rotating working bodies, in particular to screw rotary superchargers.

Known rotary screw injected with the regulation of the geometric degree of compression inside the working cavity.

From the description of patent US 6338616, IPC ⁷ F04C 18/16, priority dated January 15, 2002, a rotary screw compressor is known with a movable portion of the casing wall in the region adjacent to the outlet window. The compressor is equipped with a moving device for positioning the movable section in two positions: fully closed or fully open. When the movable wall section is disconnected from the rotor housing, the length of the exhaust process increases, while the geometric compression ratio inside the working cavity is simultaneously reduced.

A disadvantage of the known analogue is the inability to control the filling of the working cavity of the compressor during the intake process.

This disadvantage is eliminated in an engine with a compressor, known from the description of patent US 8256403, IPC ⁷ Н02K 7/18, F02B 33/00, F04D 29/56, publ. 05/25/2010, selected as a prototype. The compressor with two screw rotors is equipped with a control device that changes the supply and air pressure at the inlet, depending on the load on the engine. The control device has at least one movable element moving relative to at least one of the rotors to change the volume of air moved by the rotors and selectively increases or decreases the volume of air supplied to the intake manifold of the engine. Each movable element of the control device is driven by a separate solenoid, thereby providing smooth control of flow and pressure. The specified technical solution is taken as the closest analogue (prototype).

The disadvantages of the prototype include the difficulty of using an electric drive for individual movable shutters of the device for changing the performance of the supercharger.

The problem solved by the invention is to increase the efficiency of regulating the supply and pressure of air at the inlet of the internal combustion engine.

Technical result: regulating the performance of the supercharger and changing the pressure ratio inside the working chamber:

p1 / p2,

Where:

p1 - pressure in the working chamber at the time of disconnection of the intake window,

P2 - pressure in the working chamber at the time of connection of the exhaust window.

The technical result is achieved by the fact that a screw supercharger comprising a housing having a front end, rear end and side walls, a driving and driven screw rotors with synchronizing gears mounted in the cavity of the housing with the possibility of rotation with the formation of working chambers between the screw surfaces of the rotors and the inner surfaces of the housing , an exhaust window made in the front end wall of the housing, an intake window made in the upper part of the housing in the form of a through box-shaped element with walls, inside which is mounted the blower performance change device in the form of at least two connected flaps mounted for movement along the longitudinal centerline of the hull. The device for changing the performance of the supercharger comprises a unit for moving the shutters, interconnected by means of a flexible connection, with the possibility of turning the shutters relative to each other around an axis perpendicular to the longitudinal axial line of the housing, made in the form of a wheel mounted for rotation with rolling around the shutters and their sequential winding on a wheel whose rolling axis is mainly parallel to the axis of rotation of the flexible connection of the dampers and on which one of the regional shutters, located mainly on the side of the rear end wall of the housing, and the drive rod.

At the same time, the flexible connection of the shutters between themselves can be performed: in the form of hinges with rolling in kinematic pairs, in the form of a flexible tape fixed to the shutters by clamps, in the form of a cable with intermediate rotary elements and end elements rigidly fixed to the cable. The drive rod can be mounted on a wheel axis mounted for rotation, or can be fixedly mounted on a pulley rigidly attached to the wheel. In addition, the drive unit for moving the shutters can be made in the form of an electric actuator, pneumatic actuator or hydraulic actuator.

The drawings show:

Figure 1 is a top view of the supercharger body;

Figure 2 is a view of the compressor housing from the front wall;

Figure 3 - General view of the housing of the supercharger;

Figure 4 is a view of a fragment of the supercharger assembly from the rear wall in the fully open intake window;

5 is a General view of the supercharger assembly;

6 is a view of a fragment of the inner surface of the walls of the housing of the blower and the shutters in the closed position from the bottom (from the inside of the cavity of the housing);

Fig.7 is a design variant of a flexible connection of the shutters, made in the form of a swivel with an enlarged fragment of the connection;

Fig. 8 is a design view of a flexible connection of the shutters made in the form of a flexible tape with an enlarged fragment of the connection;

Fig.9 is a design variant of the flexible connection of the shutters, made in the form of a cable with rotary elements with an enlarged fragment of the connection;

Figure 10 - design of the mechanical connection of the unit for moving the shutters with a drive rod made in the form of a cable with an enlarged fragment of the connection;

11 is a design of the mechanical connection of the pulley of the wheel - the node moving the dampers with a cable-rod.

Screw blower includes:

1. drive screw rotor

2. driven rotor

3. supercharger housing

4. front end wall

5. back end wall

6. side walls

7. intake window

8. release window

9. pass-through box element

10. the inner surface of the housing

11. timing gear of the driving rotor

12. synchronizing gear of the driven rotor

13. working chamber

14. damper device performance change

 supercharger

15. wheel

16. wheel axle

17. flexible connection of adjacent dampers

18. swivel joint in kinematic pairs, forming a flexible connection of dampers

19. fasteners of a flexible connection made in the form of a tape

20. swivel link of a flexible connection made in the form of a cable

21. end elements

22. inner surface of adjacent shutters

23. wheel pulley

24. draft of the drive unit for moving the shutters.

The screw blower comprises a housing 3 having a front end 4, a rear end 5 and side 6 walls, a leading 1 and a driven 2 screw rotors with synchronizing gears, respectively 11 and 12, mounted in the cavity of the housing 3 with the possibility of rotation to form a working chamber 13 between the screw the surfaces of the rotors 1 and 2 and the inner surfaces of the housing 10. In this case, the driving screw rotor 1 has teeth, consisting mainly of a tooth leg of a convex shape, and the driven screw rotor 2 has teeth, consisting mainly of a tooth head that form. In addition, the screw supercharger includes an outlet window 8 made in the front end wall 4 of the housing 3, and an inlet window 7 made in the upper part of the housing 3 in the form of a through box element 9 with walls, inside which a device for changing the performance of the supercharger is mounted, made in the form at least two connected dampers 14 mounted for movement along the longitudinal axial line of the housing 3. The device for changing the performance of the supercharger includes a unit for moving the dampers 14, interconnected by means of a flexible connection 17, with the possibility of rotation of the shutters 14 relative to each other around an axis perpendicular to the longitudinal axial line of the housing 3, made in the form of a wheel 15 mounted for rotation with rolling around the shutters 14 and sequentially winding them on the wheel 15 , the rolling axis 16 of which is mainly parallel to the rotation axes of the shutters 14 and on which one of the extreme shutters 14, located on the side of the rear end wall 5 of the housing 3, is rigidly fixed, and the drive rod 24. The position of the wheel 15 relative to the rear end wall 5 and, accordingly, the dampers 14a determines the cross-sectional area of the inlet window 7, the filling of the working measure 13 and the volumetric feed of the screw blower. The inner surface 22 of the adjacent shutters 14 is made in a form identical to the inner surface 10 of the supercharger body, which, in turn, is formed mainly by the inner surfaces of two coaxially intersecting cylinders.

A flexible connection of 17 adjacent dampers to each other can be made: in the form of hinges with rolling in kinematic pairs 18, in the form of a flexible tape fixed to the dampers with latches 19, in the form of a cable with intermediate rotary links 20 and end elements 21 rigidly fixed to the cable.

The drive rod 24 can be mounted on the axis of the wheel 16 mounted for rotation. In addition, the rod 24 of the drive can be fixedly mounted on the pulley 23, rigidly attached to the wheel 15.

The drive unit for moving the shutters can be made in the form of an electric actuator, pneumatic actuator or hydraulic actuator.

Screw supercharger operates as follows. Air through the inlet window 7 enters the working chamber formed between the screw surfaces of the rotors 1 and 2 and the inner surfaces 10 of the housing 3, and is compressed by reducing their volume. At the moment determined by the necessary parameters of the working process, compressed air through the exhaust window 8 is displaced from the supercharger.

The performance of the supercharger is controlled by changing the cross-sectional area of the inlet window 7 by moving the shutters 14 along supporting guides (not shown) of the inner walls of the through box element 9 along the longitudinal axial line of the housing 3 and sequentially winding it onto the wheel 15, the rotation of which is carried out by the drive rod 24. To ensure maximum (one hundred percent) performance of the supercharger, all the shutters 14 are wound on the wheel 15, the inlet window 7 is fully open. To reduce the performance of the supercharger, the direction of the drive traction force vector is reversed and the shutters 14 are rewound from the wheel 15, which reduces the cross-sectional area of the inlet window 7 and, accordingly, reduces the volume of air supplied.

The implementation of the shutters 14, interconnected by means of a flexible connection 17, with the possibility of rotation of the shutters 14 relative to each other allows you to choose the mode of operation of the supercharger, which is the most suitable for optimal, by obtaining intermediate values of the internal compression ratio depending on the position of the shutters 14 relative to the inlet window 7, and also due the possibility of preliminary selection of the number of dampers 14 and their proportionality relative to each other.

The proposed device can be manufactured in accordance with known technological processes, using standard equipment and used in industry, including power engineering.

Claims (9)

1. A screw supercharger comprising a hollow housing having a front end, rear end and side walls, a drive and a driven screw rotors with synchronizing gears mounted in the cavity of the housing with the possibility of rotation to form working chambers between the screw surfaces of the rotors and the inner surfaces of the housing, the exhaust window made in the front end wall of the housing, an inlet window made in the upper part of the housing in the form of a through box-shaped element with walls, inside which the device is mounted change in the performance of the supercharger, made in the form of at least two connected dampers mounted for movement along the longitudinal axial line of the casing, characterized in that the device for changing the performance of the supercharger comprises a unit for moving the dampers interconnected by means of a flexible connection, with the possibility of rotation of the dampers relative to each other around an axis perpendicular to the longitudinal axial line of the housing, made in the form of a wheel mounted for rotation with rolling around the dampers and winding them sequentially onto a wheel whose rolling axis is mainly parallel to the axis of rotation of the dampers and on which one of the extreme dampers is fixed, located mainly from the side of the rear end wall of the housing, and the drive rod. 2. The screw supercharger according to claim 1, characterized in that the flexible connection of the dampers to each other is made in the form of hinges with rolling in kinematic pairs. 3. The screw supercharger according to claim 1, characterized in that the flexible connection of the shutters to each other is made in the form of a flexible tape fixed to the shutters by clamps. 4. The screw supercharger according to claim 1, characterized in that the flexible connection of the dampers to each other is made in the form of a cable, intermediate rotary elements and end elements rigidly fixed to the cable. 5. The screw supercharger according to claim 1, characterized in that the drive rod is mounted on a wheel axis mounted for rotation. 6. The screw blower according to claim 1, characterized in that the drive rod is fixedly mounted on a pulley rigidly attached to the wheel. 7. The screw blower according to claim 1, characterized in that the drive unit for moving the shutters is made in the form of an electric drive. 8. The screw blower according to claim 1, characterized in that the drive unit for moving the shutters is made in the form of a pneumatic actuator. 9. The screw blower according to claim 1, characterized in that the drive unit for moving the shutters is made in the form of a hydraulic actuator.

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