CN112943607A - Screw compressor - Google Patents

Abstract

The invention relates to a screw compressor which comprises a machine body, a rotor piece, a cam structure and a volume adjusting assembly. The rotor piece is arranged in a rotor cavity of the machine body, the rotor piece rotates to realize compression of gas, and the compressed gas is discharged into a discharge cavity. Because be provided with the cam structure on the rotor spare, and cam structure and rotor spare and synchronous rotation utilize the structural butt dogtooth of cam and volume adjusting part butt, realize adjusting the regulation of chamber and discharge intercommunication volume. Above-mentioned screw compressor utilizes the cooperation of the structural butt dogtooth of cam and volume adjusting part, avoids using electronic chip or electron to actuate the motion of control volume adjusting part such as component, need not connect external power source, also need not manually or through the part of other external devices cooperation control volume adjusting part motion for the volume adjusting part is adjusted and is adjusted the volumetric simple structure in chamber, and the stability of the process of making an uproar is higher in the regulation.

Description

Screw compressor

Technical Field

The invention relates to the technical field of compressors, in particular to a screw compressor.

Background

A screw compressor is a high-speed rotary positive displacement compressor, and sucks gas by rotation of a rotor, accumulates the gas between the rotor and a casing, is compressed by rotation of the rotor, and is finally discharged. However, since the compression process is completed in the closed space, the compressed high-pressure gas reaches the discharge chamber and starts to be discharged, which causes pressure pulsation at the time of communication with the discharge chamber at the end of the compression process, and thus generates vibration radiation noise. And traditional screw compressor realizes falling the purpose of making an uproar through setting up the pulsation damping device, however, traditional pulsation damping device structure is complicated, and then leads to adjusting to fall to make an uproar poor stability, influences screw compressor's normal operating.

Disclosure of Invention

The invention provides a screw compressor aiming at the problem that the traditional pressure pulsation attenuation device is complex in structure and poor in noise reduction regulation stability, and the screw compressor can achieve the technical effects of reducing the complex structure and ensuring the noise reduction regulation stability.

A screw compressor comprises a machine body, a rotor piece, a cam structure and a volume adjusting assembly, wherein a rotor cavity is formed in the machine body, and a discharge cavity communicated with the rotor cavity is formed in the machine body; the rotor member is arranged in the rotor cavity and can rotate in the rotor cavity around an axis; the cam structure is arranged on the rotor piece, the rotor piece can drive the cam structure to synchronously rotate, and the outer edge of the cam structure is provided with abutting convex teeth; the machine body is further provided with an adjusting cavity, the adjusting cavity is communicated with the discharge cavity, one end of the volume adjusting component penetrates through the adjusting cavity, the other end of the volume adjusting component can abut against the abutting convex teeth on the outer edge of the cam structure, and the cam structure is used for driving the volume adjusting component to move in the adjusting cavity so as to adjust the volume of the adjusting cavity communicated with the discharge cavity.

In one embodiment, the rotor member is provided with an interdental cell volume, and at the moment when the interdental cell volume is communicated with the discharge cavity, the abutting convex teeth push the volume adjusting component to move so as to increase the volume of the adjusting cavity communicated with the discharge cavity.

In one embodiment, the rotor teeth drive the cam structure to rotate along a first direction, a first tooth surface and a second tooth surface which are abutted with the volume adjusting assembly are formed on a single abutting convex tooth, the first tooth surface and the second tooth surface intersect to form a crest line of the abutting convex tooth, and the direction from the second tooth surface to the first tooth surface is the first direction; the moving direction of the volume adjusting component in the adjusting cavity faces to the rotating axis of the cam structure, and when the inter-tooth element volume is communicated with the discharge cavity, the other end of the volume adjusting component is abutted against the first tooth surface of the abutting convex tooth.

In one embodiment, a plane formed by the crest line of the abutment convex tooth and the rotation axis is a reference plane, and an included angle between the first tooth surface and the reference plane is smaller than an included angle between the second tooth surface and the reference plane.

In one embodiment, the number of the abutting convex teeth is the same as the number of the teeth of the rotor member, and the abutting convex teeth are uniformly arranged around the rotation axis of the cam structure.

In one embodiment, the volume adjusting assembly includes a piston body and a piston rod, the piston body is disposed in the adjusting cavity, an outer wall of the piston body abuts against an inner wall of the adjusting cavity, one end of the piston rod is connected to the piston body, the other end of the piston rod can abut against the abutting convex tooth on the outer edge of the cam structure, and the piston rod can push the piston body to move in the adjusting cavity in a direction toward or away from the cam structure.

In one embodiment, the volume adjusting assembly further includes an abutting wheel rotatably disposed on an end of the piston rod away from the piston body, and the abutting wheel can abut against the abutting convex tooth on the outer edge of the cam structure.

In one embodiment, the volume adjusting assembly further comprises an elastic member disposed on the piston body, the elastic member being used for applying an elastic force to the piston body in a direction toward the cam structure; or

The volume adjusting assembly further comprises an elastic piece, the elastic piece is arranged on the piston rod, and the elastic piece is used for applying elastic force towards the cam structure direction to the piston rod.

In one embodiment, the inner wall of the adjusting cavity is provided with a wear-resistant layer.

In one embodiment, a communication hole is formed in the inner wall of the adjusting cavity, a suction cavity is further formed in the machine body, the suction cavity is communicated with the discharge cavity through the rotor cavity, the adjusting cavity is communicated with the suction cavity through the communication hole, and the communication hole is located on the side, opposite to the discharge cavity, of the volume adjusting assembly; or

The inner wall of the adjusting cavity is provided with a communicating hole, the adjusting cavity is communicated with the outside through the communicating hole, and the communicating hole is positioned on one side of the volume adjusting assembly back to the discharge cavity.

In one embodiment, a resonant cavity is formed on an inner wall of the discharge cavity, and the resonant cavity is used for attenuating airflow pulsation entering the discharge cavity.

In one embodiment, a cavity is formed on an inner wall of the discharge cavity, a cover plate is arranged on the inner wall of the discharge cavity, the cover plate covers the cavity, a through hole communicated with the cavity is formed in the cover plate, and the through hole and the cavity together form the resonant cavity.

In one embodiment, the rotor member includes a female rotor disposed within the rotor cavity and a male rotor disposed within the rotor cavity and rotating in mesh with the female rotor; the cam structure is arranged on the male rotor or the female rotor, and the number of the abutting convex teeth is the same as the number of teeth of the male rotor.

According to the screw compressor, the rotor piece is arranged in the rotor cavity of the machine body, and the rotor piece can realize compression of gas in the rotating process, so that the compressed gas is discharged into the discharge cavity. Because be provided with the cam structure on the rotor spare, and cam structure and rotor spare and synchronous rotation utilize the structural butt dogtooth of cam and volume adjusting part butt, realize adjusting the regulation of chamber and discharge intercommunication volume. Above-mentioned screw compressor utilizes the cooperation of the structural butt dogtooth of cam and volume adjusting part, avoids using electronic chip or electron to actuate the motion of control volume adjusting part such as component, need not connect external power source, also need not manually or through the part of other external devices cooperation control volume adjusting part motion for the volume adjusting part is adjusted and is adjusted the volumetric simple structure in chamber, and the stability of the process of making an uproar is higher in the regulation.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Furthermore, the drawings are not to scale of 1:1, and the relative dimensions of the various elements in the drawings are drawn only by way of example and not necessarily to true scale. In the drawings:

FIG. 1 is a schematic view of a partial structure of a screw compressor according to an embodiment;

fig. 2 is a sectional view of the screw compressor shown in fig. 1.

Description of reference numerals:

10. the screw compressor comprises a screw compressor body 100, a machine body 110, a rotor cavity 120, a discharge cavity 130, an adjusting cavity 140, a communication hole 150, a resonant cavity 152, a cavity 154, a cover plate 156, a through hole 200, a rotor part 210, a female rotor 220, a male rotor 300, a cam structure 310, an abutting convex tooth 312, a first tooth surface 314, a second tooth surface 400, a volume adjusting component 410, a piston body 420, a piston rod 430, a sealing ring 440, an elastic part 450, a wear-resisting sleeve 460 and an abutting wheel.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Referring to fig. 1 and 2, a screw compressor 10 according to an embodiment of the present invention is used for compressing gas. The screw compressor 10 includes a body 100, a rotor 200, a cam structure 300, and a volume adjustment assembly 400. A rotor chamber 110 is formed in the machine body 100, and a discharge chamber 120 communicated with the rotor chamber 110 is formed in the machine body 100; the rotor member 200 is disposed in the rotor chamber 110 and is rotatable in the rotor chamber 110 about an axis; the cam structure 300 is arranged on the rotor member 200, the rotor member 200 can drive the cam structure 300 to rotate synchronously, and the outer edge of the cam structure 300 is provided with an abutting convex tooth 310; the machine body 100 is further provided with an adjusting cavity 130, the adjusting cavity 130 is communicated with the discharge cavity 120, one end of the volume adjusting component 400 is arranged in the adjusting cavity 130 in a penetrating manner, the other end of the volume adjusting component abuts against the abutting convex teeth 310 on the outer edge of the cam structure 300, and the cam structure 300 is used for driving the volume adjusting component 400 to move in the adjusting cavity 130 so as to adjust the volume of the adjusting cavity 130 communicated with the discharge cavity 120.

In the screw compressor 10, the rotor member 200 is disposed in the rotor cavity 110 of the machine body 100, and the rotor member 200 can compress gas during rotation, and further discharge the compressed gas into the discharge cavity 120. Because the cam structure 300 is arranged on the rotor member 200, and the cam structure 300 and the rotor member 200 rotate synchronously, the volume adjusting assembly 400 is abutted by the abutting convex teeth 310 on the cam structure 300, so that the communicated volume of the adjusting cavity 130 and the discharge cavity 120 is adjusted. The screw compressor 10 avoids using an electronic chip or an electronic actuating element to control the movement of the volume adjusting assembly 400 by utilizing the matching of the abutting convex teeth 310 on the cam structure 300 and the volume adjusting assembly 400, does not need to be connected with an external power supply, and does not need parts for controlling the movement of the volume adjusting assembly 400 manually or through the matching of other external devices, so that the volume adjusting assembly 400 is simple in structure for adjusting the communicated volume of the adjusting cavity 130 and the discharge cavity 120, and the stability of the noise reduction process is higher.

In one embodiment, the rotor member 200 includes a female rotor 210 and a male rotor 220, the female rotor 210 is disposed in the rotor cavity 110, and the male rotor 220 is disposed in the rotor cavity 110 and rotates in mesh with the female rotor 210; the cam structure 300 is disposed on the male rotor 220 or the female rotor 210, and the number of the abutment teeth 310 is the same as the number of teeth of the male rotor 220. Compression of the gas is achieved by the meshing of the male rotor 220 with the female rotor 210.

In one embodiment, the rotor member 200 is disposed in the rotor cavity 110 and can rotate in the rotor cavity 110 about a rotation axis b. The cam structure 300 rotates about the rotation axis b. Specifically, the cam structure 300 is disposed on the male rotor 220, and the male rotor 220 rotates about a rotation axis b; or the cam structure 300 is disposed on the female rotor 210, and the female rotor 210 rotates about the rotation axis b.

Specifically, the teeth of male rotor 220 and female rotor 210 form the tooth space element volume. In the compression process of the screw compressor 10, after the gas enters the volume of the inter-tooth element, the volume of the inter-tooth element begins to shrink due to the fact that the convex teeth of the male rotor 220 continuously invade the concave teeth of the female rotor 210, and the compression process of the gas is realized until the moment that the volume of the inter-tooth element is communicated with the discharge cavity 120. After the inter-tooth element volume is communicated with the discharge chamber 120, the exhaust process is started and continues until the male rotor 220 teeth are fully engaged with the female rotor 210 teeth, i.e. the inter-tooth element volume is equal to zero due to the full engagement of the male and female teeth.

In other embodiments, the screw compressor 10 may also be a single screw compressor, or other types of screw compressors 10 capable of achieving gas compression may also be used.

In one embodiment, the number of the abutting convex teeth 310 is the same as the number of the teeth of the rotor member 200, and the abutting convex teeth 310 are uniformly arranged around the rotation axis b of the cam structure 300. Specifically, the number of abutment lobes 310 is the same as the number of lobes of the male rotor 220, the lobes of the male rotor 220 being evenly arranged around the axis of rotation b. Through butt dogtooth 310 and volume adjusting part 400 butt on with the cam structure 300, realize adjusting chamber 130 and the regulation of discharge chamber 120 intercommunication volume, because butt dogtooth 310 on the cam structure 300 is the same with the number of teeth of rotor piece 200, butt dogtooth 310 evenly sets up, so that make volume adjusting part 400 adjust the change rule of adjusting chamber 130 stable, can make volume adjusting part 400 adjust the volume change of adjusting chamber 130 and change along with the exhaust frequency synchronization of rotor piece 200, suit with compressed gas's discharge frequency.

In one embodiment, the rotor member 200 forms an interdental elementary volume, and at the moment when the interdental elementary volume communicates with the discharge chamber 120, the abutting teeth 310 push the volume adjusting assembly 400 to move so as to increase the volume of the adjusting chamber 130 communicating with the discharge chamber 120. During the rotation of the rotor member 200, the gas is compressed in the inter-tooth element volume, and the pressure of the gas increases continuously, thereby causing a pressure difference between the compressed gas and the gas pressure in the discharge chamber 120. At the instant when the inter-dental element volume is in communication with the discharge chamber 120, compressed gas enters the discharge chamber 120 and pulses are generated in the discharge chamber 120 by the compressed gas. At this time, the volume adjusting assembly 400 is pushed to move by abutting against the convex teeth 310, so that the volume of the communicating between the adjusting cavity 130 and the discharge cavity 120 is increased, the volume of the compressed gas contained in the discharge cavity 120 can be increased, a certain relative negative pressure is generated, and the amplitude of the pulsating pressure is reduced.

Specifically, the rotor teeth drive the cam structure 300 to rotate along a first direction a, a first tooth surface 312 and a second tooth surface 314 abutting against the volume adjusting assembly 400 are formed on a single abutting convex tooth 310, the first tooth surface 312 and the second tooth surface 314 intersect to form a tooth top line of the abutting convex tooth 310, and a direction from the second tooth surface 314 to the first tooth surface 312 is the first direction a; the moving direction of the volume-adjusting member 400 in the adjusting chamber 130 is toward the rotation axis b of the cam structure 300, and the other end of the volume-adjusting member 400 abuts on the first tooth flank 312 of the abutment lobe 310 at the moment when the interdental cell volume communicates with the discharge chamber 120. At the moment when the interdental elementary volume communicates with the discharge chamber 120, the volume adjusting member 400 abuts against the first tooth surface 312 of the abutment tooth 310, and since the abutment tooth 310 rotates from the second tooth surface 314 toward the first tooth surface 312, the other end of the volume adjusting member 400 rotates on the first tooth surface 312 toward the addendum line, so as to push the volume adjusting member 400 to move in the adjusting chamber 130 away from the cam structure 300, thereby increasing the volume of the adjusting chamber 130 communicating with the discharge chamber 120.

In other embodiments, the abutting convex teeth 310 may have other structural shapes, and the moving direction of the volume adjusting assembly 400 in the adjusting cavity 130 may also be toward other directions, as long as the communicated volume of the adjusting cavity 130 and the discharging cavity 120 is increased at the moment of communicating the inter-tooth element volume with the discharging cavity 120.

In one embodiment, a plane formed by the crest line of the abutment tooth 310 and the rotation axis b of the cam structure 300 is a reference plane, and an included angle between the first tooth surface 312 and the reference plane is smaller than an included angle between the second tooth surface 314 and the reference plane. After the gas compression is finished, when the compressed gas enters the discharge cavity 120 from the volume of the interdental element, the volume adjusting component 400 abuts against the first tooth surface 312, and because the included angle between the first tooth surface 312 and the reference surface is smaller than the included angle between the second tooth surface 314 and the reference surface, the adjusting cavity 130 at the moment has the largest volume change rate, the volume of the discharge cavity 120 is rapidly increased, the relative negative pressure generated by the volume of the discharge cavity 120 can be rapidly increased, the instantaneous pulse pressure of the compressed high-pressure gas communicated with the discharge cavity 120 is weakened, and the attenuation of the gas pulsation at the exhaust end is realized. Meanwhile, since the abutting convex teeth 310 have the same number of teeth as the rotor member 200, the abutting convex teeth 310 push the volume adjusting assembly 400 to adjust the adjusting cavity 130 to the maximum volume change rate in the above process, and the frequency of discharging the compressed gas into the discharge cavity 120 occurs synchronously, and the screw compressor 10 in the above embodiment has the airflow pulsation attenuation effect in all operating conditions.

In one embodiment, a communication hole 140 is formed on an inner wall of the adjustment chamber 130, a suction chamber is further formed in the machine body 100, the suction chamber is communicated with the discharge chamber 120 through the rotor chamber 110, the adjustment chamber 130 is communicated with the suction chamber through the communication hole 140, and the communication hole 140 is located on a side of the volume adjustment assembly 400 opposite to the discharge chamber 120. When the volume adjusting assembly 400 adjusts the communicated volume between the adjusting chamber 130 and the discharge chamber 120, the communicating hole 140 prevents the space of the volume adjusting assembly 400 on the side opposite to the discharge chamber 120 from being sealed, which causes large resistance to the movement of the volume adjusting assembly 400 and affects the movement of the volume adjusting assembly 400 in the adjusting chamber 130. The space of the adjusting chamber 130 on the side of the volume adjusting unit 400 opposite to the discharge chamber 120 is communicated with the suction chamber through the communication hole 140, so that resistance caused by the compression of the gas in the closed space can be prevented, and the consumption of the useless work of the volume adjusting unit 400 can be reduced. Meanwhile, since the communication hole 140 is communicated with the suction chamber, foreign substances, etc. are prevented from entering the regulation chamber 130, which affects the movement of the volume regulation assembly 400 in the regulation chamber 130. Further, if a small amount of gas leaks from the exhaust chamber 120 to the side of the volume adjusting assembly 400 opposite to the exhaust chamber 120, the leaked gas can enter the suction chamber, and the gas is prevented from leaking to the outside.

In another embodiment, the adjusting chamber 130 communicates with the outside through the communication hole 140, and the communication hole 140 is located at a side of the volume adjusting assembly 400 opposite to the discharge chamber 120. Resistance due to the compression of the gas in the enclosed space can be avoided and the consumption of useless work by the volume adjusting assembly 400 can be reduced.

Further, the communication hole 140 is opened in a bottom wall of the adjustment chamber 130, or the communication hole 140 is opened in a position of the adjustment chamber 130 away from the discharge chamber 120. It is possible to avoid the influence of the displacement of the volume adjusting assembly 400 within the adjusting chamber 130 on the communication of the adjusting chamber 130 with the suction chamber through the communication hole 140.

In one embodiment, the volume adjusting assembly 400 includes a piston body 410 and a piston rod 420, the piston body 410 is disposed in the adjusting cavity 130, an outer wall of the piston body 410 abuts against an inner wall of the adjusting cavity 130, one end of the piston rod 420 is connected to the piston body 410, the other end of the piston rod 420 can abut against the abutting teeth 310 on the outer edge of the cam structure 300, and the piston rod 420 can push the piston body 410 to move in the adjusting cavity 130 in a direction toward or away from the cam structure 300. The adjustment of the volume of the adjustment chamber 130 is facilitated by the piston body 410, and the movement of the piston body 410 following the rotation of the cam structure 300 is facilitated by the piston rod 420. In this embodiment, one end of piston rod 420 is threadedly coupled to piston body 410. In other embodiments, one end of the piston rod 420 may be hinged to the piston body 410, or fixed directly to the piston body 410.

Specifically, the volume adjusting assembly 400 further includes a sealing ring 430, and the sealing ring 430 is sleeved on the piston body 410 and is located between the piston body 410 and the inner wall of the adjusting cavity 130. By providing the sealing ring 430 on the piston body 410, the sealing performance between the piston body 410 and the inner wall of the adjustment chamber 130 can be further improved, and the gas in the discharge chamber 120 is prevented from leaking into the adjustment chamber 130 in which the piston body 410 is opposite to the discharge chamber 120. Further, the sealing ring 430 is made of a wear-resistant material, so that wear between the sealing ring 430 and the inner wall of the adjustment cavity 130 is reduced.

In this embodiment, two sealing rings 430 are provided, and the two sealing rings 430 are disposed on the piston body 410 at intervals along the moving direction of the piston body 410, so as to further improve the sealing performance between the piston body 410 and the inner wall of the adjusting cavity 130. In other embodiments, the number of the sealing rings 430 may be one, three, etc. as long as the sealing performance between the piston body 410 and the inner wall of the adjusting cavity 130 is ensured.

In an embodiment, the volume adjusting assembly 400 further includes an elastic member 440, the elastic member 440 is disposed on the piston body 410, and the elastic member 440 is used for applying an elastic force to the piston body 410 in a direction toward the cam structure 300. The stability of the piston rod 420 abutting against the cam structure 300 can be improved by arranging the elastic member 440, so that the piston rod 420 can drive the piston body 410 to change along with the abutting convex teeth 310 on the cam structure 300.

Specifically, the elastic member 440 is disposed in the adjustment chamber 130 and located on a side of the piston body 410 opposite to the piston rod 420, one end of the elastic member 440 abuts against the piston body 410, and the other end abuts against a bottom wall of the adjustment chamber 130. So that elastic member 440 applies elastic force to piston body 410 in a direction toward cam structure 300.

In another embodiment, the volume adjusting assembly 400 further includes an elastic member 440, the elastic member 440 is disposed on the piston rod 420, and the elastic member 440 is configured to apply an elastic force to the piston rod 420 in a direction toward the cam structure 300, as long as the stability of the piston rod 420 abutting against the cam structure 300 can be improved by the elastic member 440.

In this embodiment, the elastic member 440 is a spring. The spring has a large stiffness coefficient and an elastic restoring force sufficient to allow the piston body 410 to overcome the frictional force between the gas pressure of the discharge chamber 120 and the inner wall of the adjustment chamber 130 and to allow the piston rod 420 to be closely adhered to the outer wall of the cam structure 300. In other embodiments, the elastic member 440 may be other elastic members.

In one embodiment, the inner wall of the adjustment chamber 130 is provided with a wear resistant layer. Because piston body 410 moves in adjusting chamber 130, lead to the wearing and tearing between piston body 410 and the inner wall of adjusting chamber 130 great, through set up the wearing layer on the inner wall of adjusting chamber 130, can reduce the wearing and tearing of piston body 410 to adjusting chamber 130 inner wall, and then guarantee the leakproofness between piston body 410 and the inner wall of adjusting chamber 130.

Specifically, the volume adjusting assembly 400 further includes a wear-resistant sleeve 450, an outer wall of the wear-resistant sleeve 450 is attached to an inner wall of the adjusting chamber 130 to form a wear-resistant layer, and the piston body 410 is disposed in the wear-resistant sleeve 450 and can move in the wear-resistant sleeve 450. In other embodiments, a wear-resistant coating may be applied to the inner wall of the conditioning chamber 130 to form a wear-resistant layer.

In one embodiment, the volume adjustment assembly 400 further includes an abutting wheel 460, the abutting wheel 460 is rotatably disposed on an end of the piston rod 420 away from the piston body 410, and the abutting wheel 460 can abut against the abutting teeth 310 on the outer edge of the cam structure 300. The use of the abutment wheel 460 can reduce the frictional resistance on the cam structure 300, thereby reducing the wear of the piston rod 420 and the cam structure 300.

In the present embodiment, the abutting wheel 460 is disposed on one end of the piston rod 420 through a rotating shaft, and the axial direction of the rotating shaft is consistent with the direction of the rotating axis b of the cam structure 300, so as to ensure that the abutting wheel 460 can rotate along with the rotation of the cam structure 300. In another embodiment, a rotation groove may be formed at one end of the piston rod 420, the abutment wheel 460 is in a spherical structure, the abutment wheel 460 is disposed in the rotation groove and can rotate in the rotation groove, and a portion of the abutment wheel 460 protruding out of the rotation groove can abut against the cam structure 300.

In an embodiment, a resonant cavity 150 is disposed on an inner wall of the discharge chamber 120, and the resonant cavity 150 is used for attenuating the airflow pulsation entering the discharge chamber 120. By adjusting the volume by the volume adjusting assembly 400, the pulsation attenuation effect of the air flow in all the working conditions can be realized. By further superimposing resonance of the resonance chamber 150, the attenuation effect is further improved.

In this embodiment, a cavity 152 is formed on an inner wall of the discharge chamber 120, a cover plate 154 is disposed on the inner wall of the discharge chamber 120, the cover plate 154 covers the cavity 152, a through hole 156 is formed on the cover plate 154 and is communicated with the cavity 152, and the through hole 156 and the cavity 152 together form the resonant cavity 150;

wherein, the target attenuation resonance frequency formula of the resonant cavity 150 is:

in the formula: c is the speed of sound; p is the perforation rate, which is the ratio of the area of the through hole 156 to the area of the portion of the cover plate 154 covering the cavity 152; l is the depth of the cavity 152; t is the thickness of the cover plate 154; d is the diameter of the through hole 156.

The design dimensions of resonant cavity 150 in particular may in turn be determined according to the target attenuated resonance frequency.

In the present embodiment, the cover plate 154 is fixed to the inner wall of the discharge chamber 120 by screws. In other embodiments, the cover plate 154 may be welded, glued, or integrally formed on the inner wall of the discharge chamber 120.

In the present embodiment, the resonance cavity 150 is a helmholtz resonance cavity 150. The cavity 152 communicates with the exhaust chamber 120 through a through hole 156 in the cover plate 154. The column of air in the bore neck of the through-hole 156 reciprocates like a piston under the action of sonic pressure, has a certain mass of gas, and also rubs against the bore wall of the through-hole 156 during movement, consuming a portion of the sonic energy. The gas in the cavity 152 is resilient and resists pressure changes in the cavity 152 caused by movement of the gas column from the neck of the through hole 156. Thus, the column of gas at the throat of the bore 156 is like a mass and the gas in the cavity 152 is like a spring, constituting a resilient vibration system. When the acoustic frequency of the exhaust cavity 120 is equal to the resonant frequency thereof, the gas column in the hole neck of the through hole 156 is caused to resonate, and at this time, the vibration displacement of the gas column is the largest, the vibration speed is the largest, the friction loss of the hole wall of the through hole 156 is also the largest, the consumption of the acoustic energy is also the largest, and the air flow attenuation effect is realized.

In the present embodiment, two resonant cavities 150 are formed on the inner wall of the discharge cavity 120, and the resonant frequencies of the two resonant cavities 150 are different and can respectively correspond to the two frequencies with the highest airflow pulsation peak value in the rated operating condition of the screw compressor 10. In other embodiments, the resonant cavity 150 can be set according to the gas flow pulse frequency of the screw compressor 10 in practical application.

In the screw compressor 10, since the volume change rule that the volume adjusting assembly 400 is pushed by the abutting convex teeth 310 to adjust the communication between the adjusting cavity 130 and the discharge cavity 120 is the same as the airflow pulsation frequency of the screw compressor 10, the target attenuation frequency realized by the adjusting cavity 130 is always the airflow pulsation frequency, so that the applicable frequency range covers all working conditions, and the screw compressor 10 with fixed frequency and variable frequency can be used. Meanwhile, by matching with the resonant cavity 150, the pulsation attenuation effect of the resonant cavity 150 is superimposed with the variable volume airflow pulsation attenuation effect of the volume adjusting component 400 adjusting the adjusting cavity 130, so that the screw compressor 10 has the best airflow pulsation attenuation effect under the rated working condition.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Claims (13)

1. A screw compressor, characterized in that it comprises:

the rotor type compressor comprises a machine body, a rotor cavity and a discharge cavity, wherein the machine body is internally provided with the rotor cavity and is provided with the discharge cavity communicated with the rotor cavity;

a rotor member disposed within the rotor cavity and rotatable therein about an axis;

the cam structure is arranged on the rotor piece, the rotor piece can drive the cam structure to synchronously rotate, and the outer edge of the cam structure is provided with abutting convex teeth; and

the volume adjusting assembly is further arranged on the machine body, the adjusting cavity is communicated with the discharge cavity, one end of the volume adjusting assembly penetrates through the adjusting cavity, the other end of the volume adjusting assembly can abut against the abutting convex teeth on the outer edge of the cam structure, and the cam structure is used for driving the volume adjusting assembly to move in the adjusting cavity so as to adjust the volume of the adjusting cavity communicated with the discharge cavity.

2. The screw compressor according to claim 1, wherein an inter-tooth element volume is formed in said rotor member, and at the moment when said inter-tooth element volume is communicated with said discharge chamber, said abutting teeth push said volume adjusting member to move to increase the volume of said adjusting chamber communicated with said discharge chamber.

3. The screw compressor of claim 2, wherein the rotor teeth rotate the cam structure in a first direction, a single abutment lobe has a first tooth surface and a second tooth surface formed thereon that abut the volume adjusting assembly, the first tooth surface and the second tooth surface intersect to form a crest line of the abutment lobe, and a direction from the second tooth surface to the first tooth surface is the first direction; the moving direction of the volume adjusting component in the adjusting cavity faces to the rotating axis of the cam structure, and when the inter-tooth element volume is communicated with the discharge cavity, the other end of the volume adjusting component is abutted against the first tooth surface of the abutting convex tooth.

4. The screw compressor according to claim 3, wherein a plane formed by a crest line of the abutment lobe and a rotational axis of the cam structure is a reference plane, and an angle between the first tooth surface and the reference plane is smaller than an angle between the second tooth surface and the reference plane.

5. The screw compressor according to any one of claims 1 to 4, wherein the number of the abutment teeth is the same as the number of teeth of the rotor member, and each of the abutment teeth is uniformly arranged around the rotational axis of the cam structure.

6. The screw compressor according to any one of claims 1 to 4, wherein the volume adjustment assembly includes a piston body and a piston rod, the piston body is disposed in the adjustment chamber, and an outer wall of the piston body abuts against an inner wall of the adjustment chamber, one end of the piston rod is connected to the piston body, and the other end of the piston rod can abut against the abutting convex tooth on the outer edge of the cam structure, and the piston rod can push the piston body to move in the adjustment chamber in a direction toward or away from the cam structure.

7. The screw compressor of claim 6, wherein the volume adjustment assembly further comprises a contact wheel rotatably disposed on an end of the piston rod remote from the piston body, the contact wheel capable of contacting the contact teeth on the outer edge of the cam structure.

8. The screw compressor according to claim 6, wherein the volume adjusting assembly further comprises an elastic member disposed on the piston body, the elastic member being configured to apply an elastic force to the piston body in a direction toward the cam structure; or

The volume adjusting assembly further comprises an elastic piece, the elastic piece is arranged on the piston rod, and the elastic piece is used for applying elastic force towards the cam structure direction to the piston rod.

9. -screw compressor according to claim 6, characterised in that the inner wall of the adjustment chamber is provided with a wear resistant layer.

10. The screw compressor according to any one of claims 1 to 4, wherein a communication hole is formed in an inner wall of the regulation chamber, a suction chamber is further formed in the housing, the suction chamber communicates with the discharge chamber through the rotor chamber, the regulation chamber communicates with the suction chamber through the communication hole, and the communication hole is located on a side of the volume regulation assembly opposite to the discharge chamber; or

The inner wall of the adjusting cavity is provided with a communicating hole, the adjusting cavity is communicated with the outside through the communicating hole, and the communicating hole is positioned on one side of the volume adjusting assembly back to the discharge cavity.

11. The screw compressor according to any one of claims 1 to 4, wherein a resonance chamber is formed on an inner wall of the discharge chamber, and the resonance chamber is configured to attenuate pulsation of the gas flow entering the discharge chamber.

12. The screw compressor according to claim 11, wherein a cavity is defined in an inner wall of the discharge chamber, a cover plate is disposed on the inner wall of the discharge chamber, the cover plate covers the cavity, and a through hole communicating with the cavity is defined in the cover plate, and the through hole and the cavity together form the resonant cavity.

13. The screw compressor according to any one of claims 1 to 4, wherein the rotor member includes a female rotor disposed in the rotor cavity and a male rotor disposed in the rotor cavity and rotating in mesh with the female rotor; the cam structure is arranged on the male rotor or the female rotor, and the number of the abutting convex teeth is the same as the number of teeth of the male rotor.

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