WO2024037331A1

WO2024037331A1 - Screw compressor

Info

Publication number: WO2024037331A1
Application number: PCT/CN2023/110529
Authority: WO
Inventors: 杨胜梅; 安伟杰; 林坤; 朱剑
Original assignee: 江森自控空调冷冻设备(无锡)有限公司; 江森自控泰科知识产权控股有限责任合伙公司
Priority date: 2022-08-16
Filing date: 2023-08-01
Publication date: 2024-02-22
Also published as: TW202409425A; CN115324892A

Abstract

Provided is a screw compressor (100), comprising: a housing (101), a fluid channel (140), and a silencing structure (320, 520, 620). The housing (101) is provided with a compression cavity (105); the fluid channel (140) is located in the housing (101), a first end (311) of the fluid channel (140) is communicated with the outside of the compressor (100), and a second end (312) of the fluid channel (140) is communicated with the compression cavity (105); the silencing structure (320, 520, 620) is arranged on the outer side of the fluid channel (140), the silencing structure (320, 520, 620) comprises at least one cavity (308, 408, 508, 608, 708, 808, 908, 1008, 1108, 1208), and the at least one cavity (308, 408, 508, 608, 708, 808, 908, 1008, 1108, 1208) is communicated with the fluid channel (140). The silencing structure (320, 520, 620) is arranged at the fluid channel (140) of the screw compressor (100), so that the effect of pressure changes on external pipelines connected to the fluid channel (140) can be reduced.

Description

Screw compressors

Technical field

The present application provides a screw compressor, especially a screw compressor with a muffler structure.

Background technique

The twin-screw compressor has a pair of male and female rotors that mesh with each other. The pair of male and female rotors rotate relative to each other to compress the refrigerant. The twin-screw compressor is connected to the economizer system, and the economizer system provides a part of the refrigerant (or other media) to the inside of the compressor to improve the capacity of the twin-screw compressor. The economizer system is connected to the compression chamber of the compressor through pipelines.

Contents of the invention

The present application provides a screw compressor, including: a casing, a fluid channel and a muffler structure. The casing has a compression chamber; the fluid channel is located in the casing, and the first end of the fluid channel It is connected to the outside of the compressor, and the second end of the fluid channel is connected to the compression chamber; the sound-absorbing structure is arranged outside the fluid channel, and the sound-absorbing structure includes at least one chamber, and the at least A chamber communicates with the fluid channel.

In the screw compressor as described above, the at least one chamber is arranged in an annular shape surrounding the fluid passage.

In the screw compressor as described above, the at least one chamber is arranged around a portion of the fluid passage.

In the screw compressor as described above, the at least one chamber includes a plurality of chambers, and the plurality of chambers are arranged along the extending direction of the fluid passage.

In the screw compressor as described above, the at least one chamber includes a plurality of chambers, and the plurality of chambers are staggered in the extending direction of the fluid passage.

In the screw compressor as described above, the sound attenuation structure further includes a sound attenuation material, and the sound attenuation material is filled in the at least one chamber.

In the screw compressor as described above, the sound attenuation material includes a plurality of acoustic meta-mufflers, and at least a part of the plurality of acoustic meta-mufflers is connected to the fluid channel.

As for the screw compressor as above, the muffler structure further includes a side wall, the side wall is arranged around the fluid channel and is located between the fluid channel and the at least one chamber, and the side wall is A plurality of side wall channels are provided extending through the side wall to communicate the at least one chamber with the fluid channel.

In the screw compressor as described above, in the extending direction of the fluid channel, the at least one chamber has a front end and a rear end, the front end is close to the first end of the fluid channel, and the rear end is away from the a first end of the fluid channel; at least one side wall channel of the plurality of side wall channels is proximate to a rear end of the at least one chamber.

In the above screw compressor, the muffler structure is close to the first end of the fluid channel, and the first end of the fluid channel is connected to the economizer of the air conditioning system.

The screw compressor in this application has a fluid channel that can communicate with the compression chamber and the external economizer system. Fluid passages introduce refrigerant from the economizer into the compression chamber. Since the screw compressor is working, the teeth of the rotor periodically sweep across the outlet of the fluid channel, and the pressure in the slots on both sides of the teeth of the rotor is different, resulting in constant changes in the fluid pressure in the fluid channel, which may cause problems with the economizer. The pipes connected to the system may have loose or broken interfaces due to vibration. In this application, the fluid channel is provided with a sound-absorbing structure, which can reduce the impact of pressure changes on the external pipeline of the economizer system.

Description of drawings

Figure 1A is a perspective view of the compressor in this application;

Figure 1B is a cross-sectional view of the compressor in Figure 1A;

Figure 2 is a perspective view of the rear housing of the first embodiment of the present application;

Figure 3 is a partial cross-sectional view of Figure 2;

Figure 4 is a partial cross-sectional view of the rear housing of the second embodiment of the present application;

Figure 5A is a perspective view of the noise reduction structure of the third embodiment of the present application;

Fig. 5B is a bottom view of the noise reduction structure in Fig. 5A viewed along the axial direction;

Figure 5C is an axial cross-sectional view of the sound-absorbing structure taken along line B-B in Figure 5B;

Figure 5D is an axial cross-sectional view of the sound-absorbing structure taken along line C-C in Figure 5B;

Figure 6 is an axial cross-sectional view of the sound-absorbing structure of the fourth embodiment of the present application;

Figure 7 is an axial cross-sectional view of the noise reduction structure of the fifth embodiment of the present application;

Figure 8 is a radial cross-sectional view of the noise reduction structure of the sixth embodiment of the present application;

Figure 9 is a partial cross-sectional view of the rear housing of the seventh embodiment of the present application;

Figure 10 is a partial cross-sectional view of the rear housing of the eighth embodiment of the present application;

Figure 11 is a partial cross-sectional view of the rear housing of the ninth embodiment of the present application;

Figure 12 is a partial cross-sectional view of the rear housing of the tenth embodiment of the present application.

Detailed ways

Various embodiments of the present application will be described below with reference to the accompanying drawings, which constitute a part of this specification. It should be understood that although terms referring to directions are used herein, such as "front," "back," "upper," "lower," "left," "right," etc., to describe various example structural portions of the present application. and elements, but these terms are used herein for convenience of description only and are determined based on the example orientations shown in the drawings. Since the embodiments disclosed in the present application can be arranged in different directions, these terms indicating directions are for illustration only and should not be regarded as limiting.

1A is a perspective view of the compressor in this application, and FIG. 1B is a cross-sectional view of the compressor in FIG. 1A . The compressor 100 includes a housing 101 and a male rotor 102 and a female rotor 103 located in the housing 101 . The male rotor 102 and the female rotor 103 can be driven to rotate. The male rotor 102 is drivingly connected to the motor 160 so that the motor 160 can drive the male rotor 102 to rotate around the axis of the male rotor 102 relative to the housing 101 . The female rotor 103 can be driven by the male rotor 102 to rotate relative to the housing 101 about the axis of the female rotor 103 . The outside of the male rotor 102 has a plurality of spiral teeth 168 and spiral grooves formed between adjacent teeth 168. The outside of the female rotor 103 also has a plurality of spiral teeth 169 and between adjacent teeth 169. spiral grooves formed between them. The teeth 168 and grooves of the male rotor 102 and the grooves and teeth 169 of the female rotor 103 form an intermeshing structure, so that the male rotor 102, the female rotor 103 and the housing 101 together form a compression chamber 105. A fluid passage 140 is provided in the casing 101 for providing refrigerant into the compression chamber 105 of the compressor 100 .

The housing 101 includes a front housing 171 , a middle housing 172 and a rear housing 173 . The front housing 171, the middle housing 172 and the rear housing 173 are connected in sequence. Fluid flows from front housing 171 to rear housing 173 within the compressor. Fluid passage 140 is located on rear housing 173 . The outlet of the fluid channel 140 is connected to the compression chamber 105, and the inlet is connected to the economizer system through a pipeline. The economizer system leads part of the refrigerant in the refrigeration cycle system back to the compressor to improve the capacity of the compressor. For example, the economizer system connects the fluid channel 140 to the bottom of the condenser or the subcooler, and leads a small part of the refrigerant liquid from the bottom of the condenser or the subcooler back to the compressor. This part of the refrigerant liquid can use the natural pressure difference to enter the compressor. machine. In the screw compressor, the teeth of the male rotor 102 or the female rotor 103 periodically pass through the outlet of the fluid passage 140. Due to the The pressure in the tooth grooves on both sides of the tooth is obviously different, so the pressure at the outlet of the fluid channel 140 changes to a certain extent. The complex flow patterns and pressure pulsations present in the fluid channel 140 may lead to the risk of loosening or rupture of the interface of the pipeline connected to the economizer system due to vibration. The fluid channel 140 in this application is provided with a sound-absorbing structure, which can reduce the amplitude of pressure pulsation, thereby reducing the impact of pressure pulsation on external pipelines.

Figure 2 is a perspective view of the rear housing of the first embodiment of the present application. As shown in Figure 2, the rear housing 173 has a housing end surface 202 disposed toward the middle housing 172. The male rotor 102 and the female rotor 103 are The exhaust end abuts against the housing end surface 202 , and the housing end surface 202 can close the end of the compression chamber 105 . The housing end face 202 is also provided with an internal exhaust orifice 235 , and the compression chamber 105 can be aligned with the internal exhaust orifice 235 . During the rotation of the male rotor 102 and the female rotor 103, the gas in the compression chamber 105 is continuously compressed until the compression chamber 105 is connected to the internal exhaust hole 235, and the gas in the compression chamber 105 passes through the internal exhaust hole. Port 235 enters the exhaust chamber of the compressor, and then discharges out of the compressor. Fluid channel 140 has an inlet 241 and an outlet 242. The outlet 242 is disposed on the housing end face 202 and can be swept by the exhaust end of the male rotor 102 or the female rotor 103 so as to be connected with the compression chamber 105 . The inlet 241 is provided on the outer surface of the rear housing 173. The inlet 241 is connected to the external pipeline 250. The external pipeline 250 is used to connect the economizer system, so that the economizer system can supplement refrigeration into the compression chamber 105 through the fluid channel 140. agent.

Figure 3 is a partial cross-sectional view of Figure 2. Figure 3 is a partial view of the rear housing 173 in Figure 2 cut along the direction shown by A-A and viewed along the direction shown by the arrow, showing the rear The structure near the fluid channel 140 in the housing 173. The fluid channel 140 includes a first end 311 and a second end 312. The inlet 241 is located at the first end 311 and the outlet 242 is located at the second end 312. The area of the inlet 241 is equal to or smaller than the cross-sectional area of the fluid channel 140 . In one embodiment of the present application, the fluid channel 140 includes a front section 351 and a rear section 352. The front section 351 extends along the vertical direction as shown in Figure 3, and the rear section 352 extends along the horizontal direction. In this application, the front section 351 and the rear section 352 are provided to facilitate processing and to adapt to the relative positions of the inlet 241 and the outlet 242 to connect the compression chamber 105 with the external pipeline. When the position setting of the inlet 241 changes, the position setting and the setting of the extending direction of the front section 351 and the rear section 352 of the fluid channel 140 change accordingly.

In one embodiment of the present application, the first end 311 includes a top plate 357 with a hole 359 in the middle, and the top plate 357 covers an end of the first end 311 . Hole 359 in top plate 357 forms inlet 241 .

In another embodiment of the present application, the inlet 241 is provided at other positions of the rear housing 173, and the fluid channel 140 extends along the same direction.

As shown in FIG. 3 , on the outside of the front section 351 of the fluid channel 140 , a sound attenuation structure 320 is provided surrounding the front section 351 . Sound-attenuating structure 320 includes a chamber 308 , and sound-attenuating material 371 located in chamber 308 . The chamber 308 is connected with the front section 351 Pass. The chamber 308 has an inner side 361 and an outer side 362. There is a certain distance between the inner side 361 and the outer side 362, so that the chamber 308 has a certain thickness in the radial direction of the fluid channel. The chamber 308 is generally annular with a certain thickness. In one embodiment of the present application, the outer side 362 has a side wall formed by the rear housing 173 and the inner side 361 has an opening 365 that communicates with the front section 351 of the fluid channel 140 . In one embodiment of the present application, the height of the opening 365 is equal to the height of the chamber 308, and the opening 365 extends for one week along the circumferential direction and forms a closed ring shape. That is, the area of the opening 365 is equal to the outer surface area of the front section surrounded by the sound-absorbing structure. That is to say, the chamber 308 and the front section 351 of the fluid channel 140 can form an integral space. In another embodiment of the present application, the area of the opening 365 is less than the outer surface area of the front section 351 surrounded by the chamber 308, for example, the height of the opening 365 is less than the height of the chamber 308, or the opening 365 extends along the circumferential direction. Less than a week.

The sound-absorbing material 371 is an acoustic material composed of multiple acoustic superstructure sound-absorbing units. The acoustic meta-muffler unit is a resonant cavity type acoustic meta-unit. Each acoustic meta-muffler unit has a cavity, and the cavity of the acoustic meta-muffler unit can be communicated with the front section 351 of the fluid channel 140 . The sound-absorbing material 371 can absorb the pressure pulsation in the fluid channel 140 to a certain extent and reduce the impact of the pressure pulsation on the external pipeline.

The silencing units in the silencing material 371 are set to a single size or multiple sizes, so that they can be set to silencing the sound of a certain Hertz (ie, a certain frequency), or can silencing the sound of multiple Hertz. Voice.

In this embodiment, the muffler structure 320 is disposed close to the inlet 241 of the fluid channel 140, that is, close to the connection between the fluid channel 140 and the external pipeline, so as to minimize the impact of pressure pulsation on the external pipeline. In another embodiment of the present application, the sound-absorbing structure 320 can also be provided around the entire fluid channel 140 , that is, the sound-absorbing structure 320 is provided on the outside of each section of the fluid channel 140 .

It should be noted that in this embodiment, even if the sound-absorbing material 371 is not provided in the chamber 308, the hollow chamber 308 can absorb the pressure pulsation in the fluid channel 140 to a certain extent.

4 is a partial cross-sectional view of the rear housing of the second embodiment of the present application. Similar to the embodiment shown in FIG. 3 , the difference is that a plurality of chambers 408 are provided in the extending direction of the fluid channel 140 , and there is a distance between each chamber 408 and adjacent chambers 408 . Sound-absorbing material 371 is provided in each chamber 408, or is a cavity. That is, the chambers may be intermittently provided in the extending direction of the fluid channel 140 . Compared with the first embodiment in Fig. 3, the second embodiment in Fig. 4 has similar technical effects.

Figure 5A is a perspective view of the sound-absorbing structure of the third embodiment of the present application. Figure 5B is a bottom view of the sound-absorbing structure in Figure 5A seen along the axial direction. Figure 5C is a cross-section of the sound-absorbing structure along line BB in Figure 5B An axial cross-sectional view of An axial cross-sectional view of the acoustic structure taken along line CC in Figure 5B. The cross-section in Figure 5B is shown in Figures 5A and 5B. The sound attenuation structure 520 is generally cylindrical and has an axial direction and a radial direction. The sound absorbing structure 520 has an inner wall 511 and an outer wall 512 . At least a section of the fluid channel 140 is surrounded by the inner wall 511 , for example, the front section 351 of the fluid channel 140 is surrounded by the inner wall 511 . The outer wall 512 is connected to the rear housing 173 . A space 522 is formed between the inner wall 511 and the outer wall 512 . A plurality of radial partition walls 518 extending in the radial direction and a plurality of axial partition walls 519 extending in the axial direction are provided between the inner wall 511 and the outer wall 512 . A plurality of radial partition walls 518 are arranged side by side along the axial direction to divide the space 522 into a plurality of segmented spaces 521. A plurality of axial partition walls 519 are arranged along the radial direction to divide the multiple segmented spaces 521. is a plurality of chambers 508. A plurality of axial partition walls 519 in adjacent segmented spaces 521 are staggered, so that a plurality of chambers 508 are staggered.

Among them, the inner wall 511 forms a side wall 539 of a sound-absorbing structure. The side wall 539 is provided with a plurality of side wall channels 529 that penetrate the side wall 539. The plurality of side wall channels 529 can connect the fluid channel 140 with the fluid in the plurality of chambers 508. Every connection. In the extending direction of the fluid channel 140, each of the plurality of chambers 508 has a front end 581 and a rear end 582, the front end 581 is close to the first end 311 of the fluid channel 140, and the rear end 582 is away from the first end of the fluid channel 140 311. At least one of the plurality of sidewall channels 529 is close to the rear end 582 of the chamber 508 to guide the fluid in the chamber 508 back into the fluid channel 140 so that no or a small amount of liquid accumulates in the fluid channel 140 .

Compared with the first embodiment in Fig. 3, the third embodiment in Fig. 5A has similar technical effects.

Figure 6 is an axial cross-sectional view of the sound-absorbing structure 620 of the fourth embodiment of the present application. It is similar to the embodiment shown in Figure 5A. The difference is that the sound-absorbing structure 620 of the fourth embodiment no longer has an outer wall. After the sound attenuation structure 620 is installed into the rear housing 173, the rear housing 173, the axial partition wall, the inner wall 611 and the radial partition wall 618 together form a plurality of chambers 608.

Compared with the third embodiment in FIG. 5A, the fourth embodiment in FIG. 6 has similar technical effects.

Figure 7 is an axial cross-sectional view of the sound-absorbing structure of the fifth embodiment of the present application. It is similar to the embodiment shown in Figure 5A. The difference is that the bottom 765 of the chamber 708 of the fifth embodiment faces from the outside to the inside. Extending at a downward slope, this design is more conducive to discharging the liquid in the chamber 708 to the fluid channel 140 and avoiding accumulation of liquid in the chamber 708 .

Compared with the third embodiment in Fig. 5A, the fifth embodiment in Fig. 7 has similar technical effects.

Figure 8 is a radial cross-sectional view of the sound-absorbing structure of the sixth embodiment of the present application. It is similar to the embodiment shown in Figure 5A. The difference is that the inner wall 811 and the outer wall 812 of the sixth embodiment are no longer the same. The axis is arranged, that is, the distance between the inner wall 811 and the outer wall 812 is unequal as seen in radial section. Thus, each chamber 808 is no longer evenly distributed in the circumferential direction. This embodiment is suitable for situations where the installation position of some fluid channels 140 has specific requirements.

Compared with the third embodiment in Fig. 5A, the sixth embodiment in Fig. 8 has similar technical effects.

Figure 9 is a partial cross-sectional view of the rear housing of the seventh embodiment of the present application. It is similar to the embodiment shown in Figure 3. The difference is that the sound attenuation structure of the seventh embodiment in Figure 9 also includes side The wall 939 and the side wall 939 are generally cylindrical, and the side wall 939 surrounds at least a section of the fluid channel 140 . That is, sidewall 939 is disposed between fluid channel 140 and chamber 908 . The side wall 939 is provided with a plurality of side wall channels 929 penetrating the side wall 939, and the plurality of side wall channels 929 can communicate the fluid channel 140 with each of the chambers 908. In the extending direction of the fluid channel 140, there are a front end 981 and a rear end 982 in the chamber 908. The front end 981 is close to the first end 311 of the fluid channel 140, and the rear end 982 is far away from the first end 311 of the fluid channel 140. At least one of the plurality of sidewall channels 929 is close to the rear end 982 of the chamber 908 to guide the fluid in the chamber 908 back into the fluid channel 140 so that no or a small amount of liquid accumulates in the fluid channel 140 .

The sound-absorbing structure of the seventh embodiment in FIG. 9 also includes a top plate 945 covering the top of the chamber 908 and the side walls 939 to isolate the chamber 908 from the outside. The top plate 945 is provided with a hole 958, and the external pipeline is connected to the fluid channel through the hole 958. In one embodiment of the present application, the side wall 939 and the top plate 945 are integrated structures to facilitate installation.

Similar to the embodiment shown in Figure 3, chamber 908 is provided with sound attenuating material. Compared with the first embodiment in Fig. 3, the seventh embodiment in Fig. 9 has similar technical effects.

FIG. 10 is a partial cross-sectional view of the rear housing of the eighth embodiment of the present application. It is similar to the embodiment shown in FIG. 9 , but the difference is that multiple chambers 1008 are provided in the extending direction of the fluid channel 140 , there is a distance between each chamber 1008 and adjacent chambers 1008. That is, the chambers may be intermittently provided in the extending direction of the fluid channel 140 . Compared with the first embodiment in Fig. 3, the eighth embodiment in Fig. 10 has similar technical effects.

FIG. 11 is a partial cross-sectional view of the rear housing of the ninth embodiment of the present application. It is similar to the embodiment shown in FIG. 9 . The difference is that the cavity 1108 is no longer provided with a sound-absorbing material and is a cavity. Compared with the embodiment in Fig. 9, the ninth embodiment in Fig. 11 has similar technical effects.

Figure 12 is a partial cross-sectional view of the rear housing of the tenth embodiment of the present application. It is similar to the embodiment shown in Figure 10. The difference is that the cavity 1208 is no longer provided with a sound-absorbing material and is a cavity. Compared with the embodiment in Fig. 10, the ninth embodiment in Fig. 12 has similar technical effects.

The fluid passage in this application can introduce the refrigerant in the economizer into the compression chamber. During the operation of the screw compressor, the teeth of the rotor periodically sweep across the outlet of the fluid channel, which is the connection port between the fluid channel and the compression chamber. Due to the different pressures in the grooves on both sides of the teeth of the screw rotor, the fluid pressure in the fluid channel continues to change, causing vibration and noise. Pressure changes are transmitted to the external piping connecting the economizer system to the compressor fluid passage, possibly causing the interface of the external piping to loose or damaged. In this application, a sound-absorbing structure is provided outside the fluid channel, which can absorb at least part of the pressure fluctuations, reduce noise, and reduce the impact of pressure changes on the external pipelines of the economizer system.

Although the present disclosure has been described in connection with the examples of embodiments outlined above, various alternatives, modifications, variations, improvements and/or substantial equivalents, whether known or not, will become apparent to those of at least ordinary skill in the art. It may be obvious whether it is now or can be foreseen in the near future. In addition, the technical effects and/or technical problems described in this specification are illustrative rather than restrictive; therefore, the disclosure in this specification may be used to solve other technical problems and/or have other technical effects. Accordingly, the examples of embodiments of the present disclosure set forth above are intended to be illustrative and not restrictive. Various changes may be made without departing from the spirit or scope of the disclosure. Accordingly, the present disclosure is intended to include all known or earlier developed alternatives, modifications, variations, improvements and/or substantial equivalents.

Claims

A screw compressor, characterized by including:

Shell (101), the shell (101) has a compression chamber (105);

Fluid channel (140), the fluid channel (140) is located in the housing, the first end (311) of the fluid channel (140) is connected to the outside of the compressor, and the second end of the fluid channel (140) The end (312) is connected with the compression chamber (105);

A sound-absorbing structure is provided outside the fluid channel (140), the sound-absorbing structure includes at least one chamber, and the at least one chamber is in communication with the fluid channel (140).
The screw compressor according to claim 1, characterized in that:

The at least one chamber is arranged in an annular shape surrounding the fluid channel (140).
The screw compressor according to claim 1, characterized in that:

The at least one chamber is arranged around a portion of the fluid channel (140).
The screw compressor according to claim 1, characterized in that:

The at least one chamber includes a plurality of chambers arranged along an extension direction of the fluid channel (140).
The screw compressor according to claim 4, characterized in that:

The at least one chamber includes a plurality of chambers, and the plurality of chambers are staggered in the extending direction of the fluid channel (140).
The screw compressor according to claim 1, characterized in that:

The sound-attenuating structure also includes a sound-attenuating material filling the at least one cavity.
The screw compressor according to claim 6, characterized in that:

The sound-absorbing material includes a plurality of acoustic meta-muffler units, at least a part of the plurality of acoustic meta-muffler units being in communication with the fluid channel (140).
The screw compressor according to claim 1, characterized in that:

The sound-absorbing structure also includes a side wall (939), which is disposed around the fluid channel (140) and located between the fluid channel (140) and the at least one chamber, so The side wall (939) is provided with multiple side wall channels (929) The side wall channel (929) penetrates the side wall (939) to communicate the at least one chamber with the fluid channel (140).
The screw compressor according to claim 8, characterized in that:

In the extending direction of the fluid channel (140), the at least one chamber has a front end (981) and a rear end (982), the front end (981) being close to the first end of the fluid channel (140), The rear end (982) is away from the first end of the fluid channel (140);

At least one of the plurality of sidewall channels (929) is proximate the rear end (982) of the at least one chamber.
The screw compressor according to claim 1, characterized in that:

The sound-absorbing structure is close to the first end (311) of the fluid channel (140), and the first end (311) of the fluid channel (140) is connected to an economizer of the air conditioning system.