Screw compressor with a compression chamber that is formed by a compression housing, in which a pair of meshed helical compressor rotors in the form of a screw are rotatably mounted and with a drive motor that is provided with a motor chamber formed by a motor housing, in which a motor shaft is rota
Screw compressor with a compression chamber that is formed by a compression housing, in which a pair of meshed helical compressor rotors in the form of a screw are rotatably mounted and with a drive motor that is provided with a motor chamber formed by a motor housing, in which a motor shaft is rotatably mounted, and this motor shaft drives at least one of the aforementioned two compressor rotors, whereby the compression housing and the motor housing are connected directly together to form a compressor housing, whereby the motor chamber and the compression chamber are not sealed off from one another and whereby the rotor shafts of the compressor rotors, as well as the motor shaft, extend along axial directions that are oblique or transverse to the horizontal plane.
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1. A screw compressor that at least comprises the following elements: a compression chamber, comprising an inlet and an outlet, that is formed by a compression housing in which a pair of meshed helical compressor rotors in the form of screws are rotatably mounted; rotor shafts of said meshed helical
1. A screw compressor that at least comprises the following elements: a compression chamber, comprising an inlet and an outlet, that is formed by a compression housing in which a pair of meshed helical compressor rotors in the form of screws are rotatably mounted; rotor shafts of said meshed helical compressor rotors extend parallel to one another along first and second rotational axes, respectively;a non-return valve provided at the inlet of the compression chamber;a drive motor that is provided with a motor chamber formed by a motor housing, in which a motor shaft is rotatably mounted that drives at least one of the aforementioned pair of meshed helical compressor rotors,wherein the compression housing and the motor housing are connected directly to one another to form a compressor housing, whereby the motor chamber and the compression chamber are not sealed off from one another, and whereby the screw compressor is a vertical screw compressor in which the rotor shafts of the compressor rotors as well as the motor shaft extend at an angle transverse to the horizontal plane during normal operation of the screw compressor, anda pressure vessel, arranged downstream and separate from the compressor housing, comprising an outlet valve;wherein, when the screw compressor is stopped, the pressure vessel, the compression chamber, and the motor chamber are configured to be able to be in fluid communication and remain under a substantially constant compression pressure until the screw compressor is restarted. 2. The screw compressor according to claim 1, wherein the motor shaft is directly coupled to one of the rotor shafts of the compressor rotors and extends along an axial direction in line with the first or second rotational axes of the rotor shaft of the compressor rotor concerned. 3. The screw compressor according to claim 1, wherein the motor shaft also forms the rotor shaft of one of the compressor rotors. 4. The screw compressor according to claim 1, wherein the drive motor is an electric motor with a motor rotor and a motor stator. 5. The screw compressor according to claim 4, wherein the electric motor is equipped with permanent magnets to generate a magnetic field. 6. The screw compressor according to claim 4, wherein the electric motor is a synchronous motor. 7. The screw compressor according to claim 4, wherein the drive motor is of a type that can withstand the compressor pressure. 8. The screw compressor according to claim 4, wherein the drive motor is of a type that can generate a sufficiently large start-up torque to start up the screw compressor when the compression chamber is under compressor pressure. 9. The screw compressor according to claim 1, wherein the compressor rotors have a high pressure end that are supported axially and radially in the compressor housing by bearings, by means of one or more outlet bearings. 10. The screw compressor according to claim 1, wherein the compressor rotors have a low pressure end that is only supported radially in the compressor housing by one or more inlet bearings. 11. The screw compressor according to claim 1, wherein the motor shaft, at the end opposite the driven compressor rotor, is supported axially and radially in the compressor housing by means of one or more motor bearings. 12. The screw compressor according to claim 1, wherein the compression housing forms a base or bottom section of the compressor housing, and that the motor housing forms a head or top section of the compressor housing. 13. The screw compressor according to claim 12, wherein the compression chamber inlet, for drawing in air, is provided near a low pressure end, and wherein the low pressure end is at an end of the compressor rotors that are closest to the head of the compressor housing, and the compression chamber outlet, for removing compressed air, is provided near a high pressure end, and wherein the high pressure end is at an end of the compressor rotors that are the closest to the base or bottom section of the compressor housing. 14. The screw compressor according to claim 1, wherein the screw compressor is provided with a fluid, with which both the drive motor and the compressor rotors are cooled and/or lubricated. 15. The screw compressor according to claim 14, wherein the screw compressor is provided with a cooling circuit for cooling both the drive motor and the compression chamber and through which fluid can flow from a head of the compressor housing to a base of the compressor housing. 16. The screw compressor according to claim 15, wherein the cooling circuit consists of cooling channels that are provided in the motor housing and of the compression chamber itself. 17. The screw compressor according to claim 16, wherein the cooling channels at least partially extend along an axial direction. 18. The screw compressor according to claim 17, wherein the fluid is driven through the cooling channels under a compressor pressure generated by the screw compressor. 19. The screw compressor according to claim 10, wherein the screw compressor is provided with a lubrication circuit for lubricating the bearings. 20. The screw compressor according to claim 19, wherein the aforementioned lubrication circuit consists of one or more branches of cooling channels in the motor housing for supplying fluid to a motor bearing or motor bearings, and of outlet channels for the removal of fluid from the motor bearing or the motor bearings up to the inlet bearings from where the fluid can flow in the compression chamber. 21. The screw compressor according to claim 19, wherein the flow of fluid in the aforementioned lubrication circuit primarily takes place under the effect of gravity. 22. The screw compressor according to claim 20, wherein, at the motor bearing or the motor bearings, a reservoir is provided for receiving fluid that is sealed off from the motor shaft by means of a labyrinth seal. 23. The screw compressor according to claim 19, wherein a cooling circuit and the lubrication circuit are connected to a return circuit for the removal of fluid from an outlet in a base of the screw compressor and for returning the removed fluid to a head of the compressor housing. 24. The screw compressor according to claim 23, wherein the aforementioned return circuit is formed by a set consisting of an outlet pipe provided at the outlet, the pressure vessel is connected to the outlet pipe and an oil return pipe connected to the pressure vessel. 25. The screw compressor according to claim 24, wherein the outlet pipe is connected to the base of the compressor housing, and the oil return pipe is connected to the head of the compressor housing. 26. The screw compressor according to claim 24, wherein the outlet pipe between the pressure vessel and the screw compressor is free of closing means in order to enable a flow through the outlet pipe in both directions. 27. The screw compressor according to claim 24, wherein the oil return pipe is free of self-regulating non-return valves. 28. The screw compressor according to claim 23, wherein during the operation of the screw compressor, the fluid is driven through the return circuit from the base to the head of the compressor housing as a result of a compressor pressure generated by the screw compressor itself. 29. The screw compressor according to claim 23, wherein the majority of the flow of fluid, that is returned via the return circuit, flows through the cooling circuit and only a fraction flows through the lubrication circuit. 30. The screw compressor according to claim 21, wherein the lubrication circuit is provided in a base for lubricating outlet bearings, consisting of one or more supply channels for the supply of fluid from the compression chamber to the outlet bearings, as well as one or more outlet channels for the return of fluid from the outlet bearings to the compression chamber. 31. A screw compressor that at least comprises the following elements: a compression chamber, comprising an inlet and an outlet, that is formed by a compression housing in which a pair of meshed helical compressor rotors in the form of screws are rotatably mounted; rotor shafts of said meshed helical compressor rotors extend parallel to one another along first and second rotational axes, respectively;a non-return valve provided at the inlet of the compression chamber;a drive motor that is provided with a motor chamber formed by a motor housing, in which a motor shaft is rotatably mounted that drives at least one of the aforementioned pair of meshed helical compressor rotors,wherein the compression housing and the motor housing are connected directly to one another to form a compressor housing, whereby the motor chamber and the compression chamber are not sealed off from one another and whereby the screw compressor is a vertical screw compressor in which the rotor shafts of the compressor rotors as well as the motor shaft extend at an angle transverse to the horizontal plane during normal operation of the screw compressor,a pressure vessel, arranged downstream and separate from the compressor housing, comprising an outlet valve,wherein, when the screw compressor is stopped, the pressure vessel, the compression chamber, and the motor chamber are configured to be able to be in fluid communication and remain under a substantially constant compression pressure until the screw compressor is restarted,wherein the drive motor is an electric motor with a motor rotor and a motor stator,wherein the electric motor is equipped with permanent magnets to generate a magnetic field, andwherein the position of the motor rotor is determined by measuring the difference between an inductance of the electric motor along a direct motor axis and an inductance of the electric motor along an axis perpendicular to said direct motor axis, wherein the measuring takes place at a position outside of the compressor housing. 32. A screw compressor that at least comprises the following elements: a compression chamber, comprising an inlet and an outlet, that is formed by a compression housing in which a pair of meshed helical compressor rotors in the form of screws are rotatably mounted; rotor shafts of said meshed helical compressor rotors extend parallel to one another along first and second rotational axes, respectively;a non-return valve provided at the inlet of the compression chamber;a drive motor that is provided with a motor chamber formed by a motor housing, in which a motor shaft is rotatably mounted that drives at least one of the aforementioned pair of meshed helical compressor rotors, wherein the compression housing and the motor housing are connected directly to one another to form a compressor housing, whereby the motor chamber and the compression chamber are not sealed off from one another and whereby the screw compressor is a vertical screw compressor in which the rotor shafts of the compressor rotors as well as the motor shaft extend at an angle transverse to the horizontal plane during normal operation of the screw compressor,a pressure vessel, arranged downstream and separate from the compressor housing, comprising an outlet valve,wherein, when the screw compressor is stopped, the pressure vessel, the compression chamber, and the motor chamber are configured to be able to be in fluid communication and remain under a substantially constant compression pressure until the screw compressor is restarted, andwherein the motor shaft is supported axially and radially in the compressor housing by ball bearings, which are equipped with tensioning means for exerting an axial pre-load on said ball bearings, and this pre-load is oriented along an axial direction of the motor shaft.
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