Mechanism for adjusting air volume and internal volume ratio of double-screw compressor

Abstract

An air volume and internal volume ratio adjusting mechanism of a double-screw compressor comprises a power source, a transmission mechanism and a slide valve. The power source is in transmission connection with the sliding valve through a transmission mechanism so as to drive the sliding valve to move and change the air volume and the internal volume ratio of the double-screw compressor, and the double-screw compressor is characterized in that the power source is a turning motor of the double-screw compressor, and the transmission mechanism comprises a first disc buckle, a second disc buckle and a threaded shaft; the threaded shaft is rotationally arranged on a machine shell of the double-screw compressor, and the first disc buckle is installed at one end of the threaded shaft and can drive the threaded shaft to rotate bidirectionally and synchronously. The slide valve is sleeved outside the threaded shaft; an internal thread of the slide valve is spirally connected with an external thread of the threaded shaft; a shell of the turning motor is detachably connected with a machine shell of the double-screw compressor, a power output shaft of the turning motor is in key connection with the second disc buckle, and the second disc buckle is detachably connected with the first disc buckle and can drive the first disc buckle to rotate bidirectionally and synchronously. The device is simple in structure, low in implementation cost and accurate in adjustment.

Description

Technical Field

[0001] The utility model relates to the technology of screw compressors. Background Art

[0002] A twin-screw compressor is a rotary positive displacement compressor that inhales, compresses and discharges gas through the periodic change of the closed volume composed of the intermeshing yin-yang rotors and the shell. The main moving parts are a pair of yin-yang screw rotors that perform synchronous and counter-directional double-rotational motion. Its working principle is: the external power source drives the male rotor through the coupling, and the male rotor drives the female rotor to rotate through the synchronous gear. The intermeshing yin-yang rotors and the shell together form a closed working chamber that can achieve periodic volume changes, and successively realize the process of inhaling, compressing and discharging the working medium. Twin-screw compressors are widely used in many fields such as petrochemicals, coal chemical industry, fine chemicals, energy and environmental protection, etc., with the characteristics of simple structure, high reliability, strong adaptability, and convenient operation and maintenance.

[0003] In order to establish different volume ratios for twin-screw compressors, a slide valve is often used to control the effective working length of the compressor rotor. The slide valve is driven by a power source through a transmission mechanism to achieve reciprocating movement of the slide valve along the axial direction of the rotor, thereby changing the volume ratio of the twin-screw compressor. The existing twin-screw compressor volume ratio adjustment mechanism requires a special power source and the structure of the transmission mechanism is relatively complex, resulting in high implementation costs. In order to adapt to different gas volume conditions, existing twin-screw compressors often use circulating reflux or variable frequency speed regulation to adjust the compressor inlet gas volume. Circulating reflux achieves gas volume control by returning the compressed high-pressure medium to the inlet, which will cause energy waste, and the cost of variable frequency speed regulation is high. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a twin-screw compressor gas volume and internal volume ratio adjustment mechanism, which has a simple structure, low implementation cost and precise adjustment.

[0005] The utility model provides a gas volume and internal volume ratio adjustment mechanism for a twin-screw compressor, comprising a power source, a transmission mechanism and a slide valve; the power source is connected to the slide valve through the transmission mechanism to drive the slide valve to move and change the internal volume ratio of the twin-screw compressor, and the utility model is characterized in that the power source is a turning motor of the twin-screw compressor, the transmission mechanism comprises a first disc, a second disc and a threaded shaft; the threaded shaft is rotatably arranged on a casing of the twin-screw compressor, the first disc is installed on one end of the threaded shaft, and can drive the threaded shaft to rotate synchronously in both directions; the slide valve is sleeved outside the threaded shaft, and the internal thread of the slide valve is spirally connected to the external thread of the threaded shaft; the power output shaft of the turning motor is keyed to the second disc, the second disc is detachably connected to the first disc, and can drive the first disc to rotate synchronously in both directions.

[0006] The utility model has at least the following advantages:

[0007] 1. The embodiment of the utility model utilizes the existing cranking motor to realize stepless adjustment of the gas volume and internal volume ratio of the twin-screw compressor. The dual-purpose machine maximizes the utilization rate of the cranking motor and effectively reduces the implementation cost;

[0008] 2. The embodiment of the utility model drives the threaded shaft to rotate through the turning motor, thereby driving the sliding valve that is spirally matched with the threaded shaft to move, which can solve the problem that the oil-free screw compressor cannot use the oil piston to drive the sliding valve. Compared with the oil piston drive, the structure of the utility model has a faster adjustment response, a simpler structure, and more precise adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 The figure shows a schematic structural diagram of a twin-screw compressor gas volume and internal volume ratio adjustment mechanism according to an embodiment of the utility model.

[0010] Figure 2 A schematic diagram of a cylinder body and a threaded shaft of a twin-screw compressor gas volume and internal volume ratio adjustment mechanism according to an embodiment of the utility model is shown.

[0011] Figure 3 A schematic diagram of a slide valve, a threaded shaft and a first disc buckle of a twin-screw compressor gas volume and internal volume ratio adjustment mechanism according to an embodiment of the utility model is shown.

[0012] Figure 4 A schematic diagram of a turning motor and a second turning buckle of a twin-screw compressor gas volume and internal volume ratio adjustment mechanism according to an embodiment of the utility model is shown. DETAILED DESCRIPTION

[0013] The utility model is further described below in conjunction with the accompanying drawings.

[0014] The existing turning motor is only used when turning the gear. During normal working period, the turning motor is automatically disengaged and is in an idle state, which causes certain waste to a certain extent. If the turning motor can be reasonably used during normal working period, some cost can be saved.

[0015] Figures 1 to 4 The structure of the air volume and internal volume ratio adjustment mechanism of the twin-screw compressor according to the embodiment of the utility model is shown. Figures 1 to 4 The twin-screw compressor gas volume and internal volume ratio adjustment mechanism includes a power source 1, a transmission mechanism and a slide valve 3; the power source 1 is connected to the slide valve 3 through the transmission mechanism to drive the slide valve 3 to move, thereby changing the internal volume ratio of the twin-screw compressor 4.

[0016] In this embodiment, the power source 1 adopts a cranking motor of a twin-screw compressor, and the housing 10 of the cranking motor 1 can be selectively detachably connected to the housing of the gear box of the cranking mechanism (not shown in the figure) and the housing 40 of the twin-screw compressor 4. Specifically, during cranking, the housing 10 of the cranking motor 1 is detachably connected to the housing of the gear box. After the cranking is completed, the cranking motor 1 is removed so that the housing 10 of the cranking motor 1 is detachably connected to the housing 40 of the twin-screw compressor 4. In some specific embodiments, the housing 10 of the cranking motor 1 is selectively connected to the housing of the gear box or the housing 40 of the twin-screw compressor 4 through a plurality of fasteners, and the aforementioned fasteners include but are not limited to bolts and the like. Figure 4 Four bolt holes 102 provided on the connecting flange 101 of the housing 10 of the turning motor 1 are shown.

[0017] In this embodiment, the housing 40 of the twin-screw compressor 4 includes an air intake cover 401, an air intake end seat 402, a cylinder body 403, an exhaust end seat 404 and an exhaust cover 405 which are connected in sequence. Figure 1 In the example, the housing 10 of the turning motor 1 is detachably connected to the air intake end cover 401 . In other embodiments, the housing 10 of the turning motor 1 is detachably connected to the air exhaust end cover 405 .

[0018] The transmission mechanism includes a first disc buckle 21 , a second disc buckle 22 and a threaded shaft 23 .

[0019] The threaded shaft 23 is rotatably disposed on the housing 40 of the twin-screw compressor 4. Specifically, the threaded shaft 23 is sleeved with bearings (not shown) near both ends of the threaded shaft 23, and the two bearings are respectively installed on the intake end seat 402 and the exhaust end seat 404.

[0020] The first disc buckle 21 is installed at one end of the threaded shaft 23, and can drive the threaded shaft 23 to rotate synchronously in both directions (i.e., clockwise and counterclockwise). In this embodiment, the first disc buckle 21 is sleeved on one end of the threaded shaft 23 and is keyed to one end of the threaded shaft 23. Specifically, the first disc buckle 21 includes a disc portion 21a and a first barrel portion 21b connected in sequence, the disc portion 21a and the first barrel portion 21b are coaxial, and the outer diameter of the disc portion 21a is smaller than the outer diameter of the first barrel portion 21b; the outer circumferential surface of the disc portion 21a is provided with a plurality of ribs 211 extending in the axial direction at intervals along the circumferential direction, and the inner circumferential surface of the first barrel portion 21b is provided with a first spline groove 212 that matches the spline 232 at one end of the threaded shaft 23.

[0021] The slide valve 3 is sleeved on the outside of the threaded shaft 23, and the inner surface of the slide valve 3 is provided with an internal thread, and the internal thread of the slide valve 3 is spirally connected with the external thread 231 of the threaded shaft 23. The slide valve 3 is provided with guide ribs 31 on both sides of the moving direction, and the guide ribs 31 extend along the moving direction of the slide valve 3; the inner surfaces of the two opposite side walls of the cylinder body 403 are respectively provided with guide grooves 4031 that match the guide ribs; the guide ribs 31 on both sides of the slide valve 3 are respectively slidably arranged in the two guide grooves 4031 of the cylinder body 403, so that the freedom of translation and rotation of the slide valve 3 in other directions can be ensured to limit, and only the reciprocating motion from the suction end face 43 to the exhaust end face 44 along the axial direction of the male rotor 41 and the female rotor 42 is retained.

[0022] The power output shaft 12 of the turning motor 1 is key-connected with the second disc buckle 22, and the second disc buckle 22 is detachably connected to the first disc buckle 21, and can drive the first disc buckle 21 to rotate synchronously in both directions (i.e., clockwise and counterclockwise). Specifically, the second disc buckle 22 includes a second barrel portion 22b, and the inner circumferential surface of the second barrel portion 22b is provided with a second spline groove (not shown in the figure) that matches the spline of the power output shaft of the turning motor. The front end surface of the second barrel portion 22b is provided with a plurality of arcuate convex strips 220 at intervals along the circumferential direction, and the number of the arcuate convex strips 220 is equal to the number of the convex ribs 211, and a slot 221 is formed between each two adjacent arcuate convex strips 220; the plurality of convex ribs 211 are respectively embedded in the plurality of slots 221 in a one-to-one correspondence to achieve mutual meshing. In some specific embodiments, the number of the convex ribs 211 is four.

[0023] When the twin-screw compressor is working, after the unit cranking is completed, the cranking motor 1 is removed from the housing of the gear box, the cranking buckle that is keyed to the power output shaft of the cranking motor 1 and can only rotate in one direction is removed, and the second buckle 22 that can rotate in both directions is installed, and the second buckle 22 is meshed and connected with the first buckle 21 that is shrink-fitted on the outside of the threaded shaft 23 through the spline. When the twin-screw compressor needs to adjust the flow rate and internal volume ratio, the cranking motor 1 drives the threaded shaft 23 to rotate clockwise or counterclockwise to achieve the reciprocating movement of the slide valve 3 along the axial direction, ensuring the real-time matching of the internal and external pressure ratio of the twin-screw compressor, reducing energy consumption and improving efficiency.

[0024] In a specific application, the twin-screw compressor 4 of the embodiment of the utility model is an oil-free twin-screw compressor.

[0025] The embodiment of the utility model utilizes the existing cranking motor to realize stepless regulation of the gas volume and internal volume ratio of the twin-screw compressor, and the dual-purpose machine realizes the maximization of the utilization rate of the cranking motor, effectively reducing the implementation cost.

[0026] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A twin-screw compressor gas volume and internal volume ratio adjustment mechanism, comprising a power source, a transmission mechanism and a slide valve; the power source is connected to the slide valve through the transmission mechanism to drive the slide valve to move and change the gas volume and internal volume ratio of the twin-screw compressor, characterized in that: The power source is a crank motor of a twin-screw compressor, and the transmission mechanism includes a first crank, a second crank and a threaded shaft; The threaded shaft is rotatably arranged on the casing of the twin-screw compressor, the first disc buckle is installed on one end of the threaded shaft and can drive the threaded shaft to rotate synchronously in both directions; the sliding valve is sleeved outside the threaded shaft, and the internal thread of the sliding valve is spirally connected with the external thread of the threaded shaft; The power output shaft of the turning motor is keyed to the second turning buckle, and the second turning buckle is detachably connected to the first turning buckle and can drive the first turning buckle to rotate synchronously in both directions.

2. The twin-screw compressor gas volume and internal volume ratio adjustment mechanism according to claim 1, characterized in that: The first buckle is sleeved at one end of the threaded shaft and is key-connected with one end of the threaded shaft.

3. The twin-screw compressor gas volume and internal volume ratio adjustment mechanism according to claim 1, characterized in that: The first buckle comprises a disc portion and a first barrel portion connected in sequence, the disc portion is coaxial with the first barrel portion, and the outer diameter of the disc portion is smaller than the outer diameter of the first barrel portion; a plurality of convex ribs extending in the axial direction are arranged at intervals along the circumferential direction on the outer circumferential surface of the disc portion, and a first spline groove matching with the spline at one end of the threaded shaft is arranged on the inner circumferential surface of the first barrel portion; The second buckle includes a second cylindrical portion, the inner circumferential surface of the second cylindrical portion is provided with a second spline groove that matches the spline of the power output shaft of the turning motor, and the front end surface of the second cylindrical portion is provided with a plurality of arc-shaped convex strips spaced apart along the circumferential direction, the number of the arc-shaped convex strips is equal to the number of the convex ribs, and a slot is formed between every two adjacent arc-shaped convex strips; the plurality of the convex ribs are respectively embedded in the plurality of the slots in a one-to-one correspondence.

4. The twin-screw compressor gas volume and internal volume ratio adjustment mechanism according to claim 1, characterized in that: The slide valve is provided with guide ribs on both sides of the moving direction, and the guide ribs extend along the moving direction of the slide valve; The casing of the twin-screw compressor includes a cylinder body, and the inner surfaces of the two opposite side walls of the cylinder body are respectively provided with guide grooves matching the guide ribs; the guide ribs on both sides of the sliding valve are respectively slidably arranged in the two guide grooves of the cylinder body.

5. The twin-screw compressor gas volume and internal volume ratio adjustment mechanism according to claim 1, characterized in that: The casing of the twin-screw compressor comprises an air intake end cover, an air intake end seat, a cylinder body, an exhaust end seat and an exhaust end cover which are connected in sequence.

6. The twin-screw compressor gas volume and internal volume ratio adjustment mechanism according to claim 5, characterized in that: The housing of the turning motor is detachably connected to the air intake end cover or the exhaust end cover.

7. The twin-screw compressor gas volume and internal volume ratio adjustment mechanism according to claim 5, characterized in that: The threaded shaft is respectively sleeved with bearings near both ends of the threaded shaft, and the two bearings are respectively installed on the intake end seat and the exhaust end seat.

8. The twin-screw compressor gas volume and internal volume ratio adjustment mechanism according to claim 1, characterized in that: The outer shell of the turning motor is detachably connected to the casing of the twin-screw compressor.

9. The twin-screw compressor gas volume and internal volume ratio adjustment mechanism according to claim 1, characterized in that: The outer shell of the cranking motor is selectively connected to the outer shell of the gear box of the cranking mechanism or the casing of the twin-screw compressor through a plurality of fasteners.

10. The twin-screw compressor gas volume and internal volume ratio adjustment mechanism according to claim 1, characterized in that: The twin-screw compressor is an oil-free twin-screw compressor.

Images