CN204627995U - Rotary compressor - Google Patents

Abstract

The utility model discloses a kind of rotary compressor, comprising: housing; Compressing mechanism, compressing mechanism comprises cylinder, main bearing and supplementary bearing, and main bearing is located at the top of cylinder, and supplementary bearing is located at the bottom of cylinder, and at least one in main bearing and supplementary bearing is formed with relief opening, and relief opening is communicated with enclosure interior by exhaust structure; Main baffler and secondary baffler, main baffler is located at the top of main bearing, and secondary baffler is located at the bottom of supplementary bearing; Wherein compressing mechanism is provided with communicating passage, and communicating passage is communicated with exhaust structure with relief opening simultaneously, and communicating passage inwall is provided with noise-reducing structure.Effectively can reduce the gas energy of circulation in communicating passage according to the rotary compressor of the utility model embodiment, thus effectively reduce exhaust frequency range level of noise.In addition, what can effectively reduce rotary compressor enters fluctuation scope, thus it is more reliable that rotary compressor is run.

Description

Rotary compressor

Technical field

The utility model relates to compressor field, especially relates to a kind of rotary compressor.

Background technique

In correlation technique, the exhaust of rotary compressor is owing to having comparatively macro-energy, even if thus high pressure refrigerant gas is after the noise reduction of baffler, its energy also can not be decayed effectively, direct discharge rotary compressor will be unfavorable for rotary compressor reliability of operation, and cause the noise of rotary compressor large.

Model utility content

The utility model is intended to solve one of technical problem in correlation technique at least to a certain extent.For this reason, to need to propose a kind of rotary compressor noise low and reliable for the utility model.

According to rotary compressor of the present utility model, comprising: housing; Compressing mechanism, described compressing mechanism is located in described housing, described compressing mechanism comprises cylinder, main bearing and supplementary bearing, described main bearing is located at the top of described cylinder, described supplementary bearing is located at the bottom of described cylinder, described main bearing, between described supplementary bearing and described cylinder, limit compression chamber, described main bearing with at least one in described supplementary bearing is formed with the relief opening be communicated with described compression chamber, described relief opening is communicated with described enclosure interior by exhaust structure; Main baffler and secondary baffler, described main baffler be located at described main bearing top and and limit main silencing cavity between described main bearing, described secondary baffler be located at described supplementary bearing bottom and and limit secondary silencing cavity between described supplementary bearing; Wherein said compressing mechanism is provided with communicating passage, and described communicating passage is communicated with described exhaust structure with described relief opening simultaneously, and described communicating passage inwall is provided with noise-reducing structure.

According to rotary compressor of the present utility model, by arranging the communicating passage being communicated with relief opening and exhaust structure simultaneously, and in communicating passage, noise-reducing structure is set, thus the noise-reducing structure in communicating passage can be utilized effectively to reduce the energy of flow of cold media air, and then the noise of rotary compressor can be reduced.And by reducing the energy of flow of cold media air, avoid cold media air directly to discharge rotary compressor and the impact that causes its operational reliability, namely high according to the reliability of operation of the rotary compressor of the utility model embodiment.

In addition, also following additional technical feature can be had according to rotary compressor of the present utility model:

According to an embodiment of the present utility model, described communicating passage comprises the first passage that is communicated with successively to third channel, described first passage to be formed on described main bearing and to run through described main bearing, described third channel to be formed on described supplementary bearing and to run through described supplementary bearing, and described second channel to be formed on described cylinder and to run through described cylinder.

According to an embodiment of the present utility model, described exhaust structure is be formed in the air hole on described main baffler, and the upper end of described first passage is communicated with described main silencing cavity, and the lower end of described third channel is communicated with described secondary silencing cavity.

According to an embodiment of the present utility model, described exhaust structure is be formed in the air hole on described main baffler, and the upper end of described first passage is communicated with described enclosure interior, and the lower end of described third channel is communicated with described secondary silencing cavity.

According to an embodiment of the present utility model, described exhaust structure is be formed in the exhaust passage on described compressing mechanism, the upper end of described exhaust passage is communicated with described enclosure interior, the lower end of described exhaust passage is communicated with described secondary baffler, the upper end of described first passage is communicated with described main silencing cavity, and the lower end of described third channel is communicated with described secondary silencing cavity.

According to an embodiment of the present utility model, described exhaust passage inwall is formed with described noise-reducing structure.

According to an embodiment of the present utility model, described noise-reducing structure is located on the inwall of at least one in described first passage, described second channel and described third channel.

According to an embodiment of the present utility model, the cross-section area of described second channel is greater than the cross-section area of described first passage and described third channel.

According to an embodiment of the present utility model, the inner wall roughness scope of described communicating passage is: 0.2mm≤Rz≤5mm.

According to an embodiment of the present utility model, described noise-reducing structure is screw thread, annular muscle or projection.

Additional aspect of the present utility model and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present utility model.

Accompanying drawing explanation

Above-mentioned and/or additional aspect of the present utility model and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:

Fig. 1 is the schematic diagram of the rotary compressor according to the utility model first embodiment;

Fig. 2 is the schematic diagram of the rotary compressor according to the utility model second embodiment;

Fig. 3 is the schematic diagram of the rotary compressor according to the utility model the 3rd embodiment;

Fig. 4 is the schematic diagram of the rotary compressor according to the utility model the 4th embodiment;

Fig. 5 is the schematic diagram of the rotary compressor according to the utility model the 5th embodiment;

Fig. 6 is the schematic diagram of the rotary compressor according to the utility model the 6th embodiment;

Fig. 7 is the schematic diagram of the rotary compressor according to the utility model the 7th embodiment;

Fig. 8 is the schematic diagram of the rotary compressor according to the utility model the 8th embodiment.

Reference character:

100: rotary compressor;

21: cylinder; 211: compression chamber;

22: main bearing; 221: relief opening;

23: supplementary bearing;

24: communicating passage; 241: first passage; 242: second channel; 243: third channel;

25: receiving groove; 251: the first receiving bores; 252: the second receiving bores

26: exhaust passage; 27: noise-reducing structure;

31: main baffler; 311: main silencing cavity; 312: air hole;

32: secondary baffler; 321: secondary silencing cavity.

Embodiment

Be described below in detail embodiment of the present utility model, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the utility model, and can not being interpreted as restriction of the present utility model.

In description of the present utility model, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", " outward ", " clockwise ", orientation or the position relationship of the instruction such as " counterclockwise " are based on orientation shown in the drawings or position relationship, only the utility model and simplified characterization for convenience of description, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as restriction of the present utility model.In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristics.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise one or more these features.In description of the present utility model, the implication of " multiple " is two or more, unless otherwise expressly limited specifically.

In description of the present utility model, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements.For the ordinary skill in the art, the concrete meaning of above-mentioned term in the utility model can be understood as the case may be.

Below with reference to Fig. 1-Fig. 8, the rotary compressor 100 according to the utility model embodiment is described.Rotary compressor 100 can be single cylinder compressor.In description below the application, be described for single cylinder compressor for rotary compressor 100.Certainly, those skilled in the art are appreciated that rotary compressor 100 can also be multicylinder compressor such as duplex cylinder compressor etc.

As Figure 1-Figure 8, comprise according to the rotary compressor 100 of the utility model embodiment: housing (scheming not shown), compressing mechanism, main baffler 31 and secondary baffler 32.

Compressing mechanism is located in housing, compressing mechanism comprises cylinder 21, main bearing 22 and supplementary bearing 23, main bearing 22 is located at the top of cylinder 21, supplementary bearing 23 is located at the bottom of cylinder 21, main bearing 22, compression chamber 211 is limited between supplementary bearing 23 and cylinder 21, main bearing 22 with at least one in supplementary bearing 23 is formed with the relief opening 221 be communicated with compression chamber 211, relief opening 221 is communicated with enclosure interior by exhaust structure, exhaust structure plays the effect being communicated with relief opening 221 and enclosure interior, thus the cold media air after overcompression is discharged from compression chamber 211, successively through relief opening 221 and exhaust structure discharged to enclosure interior, rotary compressor 100 is discharged to again outside by the outlet pipe (scheming not shown) on housing, to participate in the circulation of refrigerant.Wherein relief opening 221 can only be formed on main bearing 22, and relief opening 221 also can only be formed on supplementary bearing 23, and certain relief opening 221 can also be formed on main bearing 22 with on supplementary bearing 23 simultaneously.

Main baffler 31 be located at main bearing 22 top and and limit main silencing cavity 311 between main bearing 22, secondary baffler 32 is located at the bottom of supplementary bearing 23 and and limits secondary silencing cavity 321 between supplementary bearing 23.

According to the rotary compressor 100 of the utility model embodiment, compressing mechanism is provided with communicating passage 24, and communicating passage 24 is communicated with exhaust structure with relief opening 221 simultaneously.First a part wherein through the high pressure refrigerant gas of relief opening 221 discharge can be discharged to enclosure interior through exhaust structure through communicating passage 24 again, certainly first the part through the high pressure refrigerant gas of relief opening 221 discharge also can be discharged to enclosure interior again through exhaust structure again after communicating passage 24, and concrete structure here will be described in detail in the following description.

Communicating passage 24 inwall is provided with noise-reducing structure 27, noise-reducing structure 27 can be formed in coarse structure on communicating passage 24 inwall, can being such as when carrying out machining to communicating passage 24 inwall, deliberately increasing its roughness, increase machining cutting thus form noise-reducing structure 27.Alternatively, noise-reducing structure 27 can be formed in the screw thread on communicating passage 24 inwall, annular muscle or projection.By arranging noise-reducing structure 27, thus when cold media air is through communicating passage 24, gas contacts with noise-reducing structure 27, and noise-reducing structure 27 and cold media air friction, effectively can reduce the energy of flow of cold media air, and then can effectively reduce gas noise.Particularly, the whole inwall of communicating passage 24 can arrange noise-reducing structure 27, or a part for communicating passage 24 arranges noise-reducing structure 27, the equal like this effect can playing reduction cold media air energy.

Alternatively, the shape of screw thread, annular muscle or projection, structure can be arbitrary, as long as cold media air can carry out rubbing thus reducing gas flow energy with above-mentioned structure.Such as, the tooth form of screw thread can be triangle, trapezoidal, zigzag fashion, rectangle etc.; The shape of cross section of annular muscle also can be arbitrary, such as triangle, trapezoidal, zigzag fashion, rectangle, arc etc.; Protruding shape can be taper, hemisphere, cube shaped etc.

Preferably, the inner wall roughness scope of communicating passage 24 is: 0.2mm≤Rz≤5mm.Wherein Rz refers to nao-and micro relief 10 height, namely in sample length, and the mean value of five maximum profile peak heights and the dark mean value sum of five largest contours paddy.By being arranged in above-mentioned scope by inner wall roughness, thus both can play the effect increasing friction, reduce cold media air energy of flow, also can not the passing ability of excessive influence cold media air in communicating passage 24.

According to the rotary compressor 100 of the utility model embodiment, by arranging the communicating passage 24 being communicated with relief opening 221 and exhaust structure simultaneously, and noise-reducing structure 27 is set in communicating passage 24, thus the noise-reducing structure 27 in communicating passage 24 can be utilized effectively to reduce the energy of flow of cold media air, and then the noise of rotary compressor 100 can be reduced.And by reducing the energy of flow of cold media air, cold media air is avoided directly to discharge rotary compressor 100 and the impact caused its operational reliability, what can effectively reduce rotary compressor 100 enters fluctuation scope, namely high according to the reliability of operation of the rotary compressor 100 of the utility model embodiment.

To sum up, effectively can reduce the gas energy of circulation in communicating passage 24 according to the rotary compressor 100 of the utility model embodiment, thus effectively reduce exhaust frequency range level of noise.In addition, what can effectively reduce rotary compressor 100 enters fluctuation scope, thus it is more reliable that rotary compressor 100 is run.

Describe the rotary compressor 100 according to the different embodiment of the utility model below with reference to accompanying drawings in detail.

As shown in Figure 1, communicating passage 24 comprises first passage 241 to the third channel 243 be communicated with successively, first passage 241 to be formed on main bearing 22 and to run through main bearing 22, third channel 243 to be formed on supplementary bearing 23 and to run through supplementary bearing 23, and second channel 242 to be formed on cylinder 21 and to run through cylinder 21.Specifically, the thickness direction of first passage 241 along main bearing 22 on vertically runs through main bearing 22, the thickness direction of second channel 242 along cylinder 21 on vertically runs through cylinder 21, third channel 243 runs through supplementary bearing 23 along the thickness direction of supplementary bearing 23, first passage 241, second channel 242 and third channel 243 are relative vertical, thus main silencing cavity 311 can be smoothly through communicating passage 24 relative free-flow in main silencing cavity 311 with secondary silencing cavity 321 with the cold media air in secondary silencing cavity 321, and easy to process, thus reduce cost.

Alternatively, noise-reducing structure 27 can be located on the inwall of at least one in first passage 241, second channel 242 and third channel 243.That is, one can arrange noise-reducing structure 27 wherein in first passage 241, second channel 242 and third channel 243, also two can arrange noise-reducing structure 27 wherein, noise-reducing structure 27 can also be all set in three passages.

As shown in Figure 1, exhaust structure can be formed in the air hole 312 on main baffler 31, and relief opening 221 is only arranged on main bearing 22, and the upper end of first passage 241 is communicated with main silencing cavity 311, and the lower end of third channel 243 is communicated with secondary silencing cavity 321.Thus, cold media air in compression chamber 211 after compression enters in main silencing cavity 311 via the relief opening 221 on main bearing 22, a part of refrigerant in main silencing cavity 311 directly enters into enclosure interior by air hole 312, another part cold media air in main silencing cavity 311 enters in secondary silencing cavity 321 by communicating passage 24, after relief opening 221 is closed, pressure in main silencing cavity 311 is less, refrigerant now in secondary silencing cavity 321 can again be entered in main silencing cavity 311 by communicating passage 24 and be discharged by air hole 312, thus effectively can reduce the energy of flow of cold media air, thus effectively can reduce the noise of rotary compressor 100, improve the operational reliability of rotary compressor 100.

As shown in Figure 2, with the example shown in Fig. 1 unlike, in example as shown in Figure 2, relief opening 221 is arranged on main bearing 22 and supplementary bearing 23 simultaneously, thus, cold media air in compression chamber 211 after compression enters in main silencing cavity 311 via the relief opening 221 on main bearing 22, enter in secondary silencing cavity 321 via the relief opening 221 on supplementary bearing 23, refrigerant in main silencing cavity 311 directly enters into enclosure interior by air hole 312, cold media air in secondary silencing cavity 321 enters in main silencing cavity 311 by communicating passage 24, two strands of cold media air are discharged by the air hole 312 on main baffler 31 again.

Certain the utility model is not limited to this, relief opening 221 can also only be arranged on supplementary bearing 23 (schemes not shown), cold media air in compression chamber 211 after compression enters in secondary silencing cavity 321 via the relief opening 221 on supplementary bearing 23, refrigerant in secondary silencing cavity 321 is entered in main silencing cavity 311 by communicating passage 24, then is discharged by the air hole 312 on main baffler 31.

Example as shown in Figure 3, with the example shown in Fig. 1 unlike, the cross-section area of second channel 242 is greater than the cross-section area of first passage 241 and third channel 243.Particularly, the cross-section area of first passage 241, second channel 242 and third channel 243 is axially equal everywhere along it respectively, and the cross-section area of second channel 242 is greater than the cross-section area of first passage 241 and the cross-section area of third channel 243 respectively, thus, the noise of rotary compressor 100 can be reduced further, improve the reliability of rotary compressor 100 further.

Certainly, the cross-section area of second channel 242 also can gradually change.Such as, the cross-section area of one end be communicated with first passage 241 of second channel 242 can be roughly equal with one end cross-section area be communicated with second channel 242 of first passage 241, the cross-section area of one end be communicated with third channel 243 of second channel 242 can be roughly equal with one end cross-section area be communicated with second channel 242 of third channel 243, the direction cross-section area elder generation that second channel 242 can be configured to the one end be axially communicated with towards it with second channel 242 from one end that it is communicated with first passage 241 along it increases gradually, after reduce gradually.

Certain the utility model is not limited to this, and first passage 241, cross-section area between second channel 242 and third channel 243 can be arbitrary proportion relations.The cross-section area of such as first passage 241 can be greater than the cross-section area of second channel 242 and third channel 243, and the cross-section area of third channel 243 is greater than the cross-section area of first passage 241 and second channel 242.Certainly, alternatively, as shown in Figure 1, first passage 241, cross-section area between second channel 242 and third channel 243 can be equal between two, or the cross-section area of first passage 241, second channel 242 and third channel 243 3 passages is all equal.

Example as shown in Figure 4, with the example shown in Fig. 1 unlike, the upper end of first passage 241 is communicated with enclosure interior, the lower end of third channel 243 is communicated with secondary silencing cavity 321, exhaust structure is be formed in the air hole 312 on main baffler 31, relief opening 221 is formed on main bearing 22, the refrigerant entered in main silencing cavity 311 from the relief opening 221 of main bearing 22 so is all discharged from the air hole 312 of main baffler 31, the part entering into the refrigerant of enclosure interior is discharged from the outlet pipe housing, a part enters in secondary silencing cavity 321 by communicating passage 24, and after relief opening 221 is closed, the pressure of enclosure interior is less, refrigerant now in secondary silencing cavity 321 can be entered in housing by communicating passage 24 and discharge from the outlet pipe housing.

As shown in Figure 5, with the example shown in Fig. 1 unlike, exhaust structure is the exhaust passage 26 be formed on compressing mechanism, exhaust passage 26 runs through main bearing 22, cylinder 21 and supplementary bearing 23 from top to bottom successively, the upper end of exhaust passage 26 is communicated with enclosure interior, the lower end of exhaust passage 26 is communicated with secondary baffler 32, and the upper end of first passage 241 is communicated with main silencing cavity 311, and the lower end of third channel 243 is communicated with secondary silencing cavity 321.As shown in Figure 5, relief opening 221 is only arranged on main bearing 22, thus, cold media air in compression chamber 211 after compression enters in main silencing cavity 311 via the relief opening 221 on main bearing 22, whole cold media air in main silencing cavity 311 enter in secondary silencing cavity 321 by communicating passage 24, refrigerant in secondary silencing cavity 321 is discharged to enclosure interior by exhaust passage 26 further again, thus effectively can reduce the energy of flow of cold media air.

Example as shown in Figure 6, with the example shown in Fig. 5 unlike, relief opening 221 is only arranged on supplementary bearing 23, thus, cold media air in compression chamber 211 after compression enters in secondary silencing cavity 321 via the relief opening 221 on supplementary bearing 23, a part of cold media air in secondary silencing cavity 321 directly enters into enclosure interior by communicating passage 24, another part cold media air in secondary silencing cavity 321 can enter in main silencing cavity 311 by communicating passage 24, after relief opening 221 is closed, pressure in secondary silencing cavity 321 is less, refrigerant now in main silencing cavity 311 can again be entered in secondary silencing cavity 321 by communicating passage 24 and be discharged by exhaust passage 26.

Alternatively, exhaust passage 26 inwall also can be formed with noise-reducing structure 27, the effect reducing cold media air energy of flow can be played thus further.

Alternatively, communicating passage 24 can be multiple, the setting and multiple communicating passage 24 is spaced apart from each other, to reduce the energy of flow of refrigerant further.Communicating passage 24 is preferably one or two.Be appreciated that the number of communicating passage 24 and the arrangement on compressing mechanism etc. can according to actual requirement adaptive change, the utility model does not do concrete restriction to this.

According to further embodiment of the present utility model, as shown in Figure 7, compressing mechanism is formed with at least one receiving groove 25, receiving groove 25 can be communicated with the main silencing cavity 311 corresponding to main bearing 22, or receiving groove 25 can be communicated with the secondary silencing cavity 321 corresponding to supplementary bearing 23.In example as shown in Figure 7, cylinder 21 is formed with the first through receiving bore 251, supplementary bearing 23 is formed with the second through receiving bore 252, second receiving bore 252 is relative with the first receiving bore about 251, first receiving bore 251 and limit above-mentioned receiving groove 25 between the second receiving bore 252 and main bearing 22, receiving groove 25 is communicated with secondary silencing cavity 321, thus adds the volume of secondary silencing cavity 321, can play the effect reducing pneumatic noise equally.Be appreciated that receiving groove 25 number can according to actual requirement adaptive change, the utility model does not do concrete restriction to this.

Preferably, the inwall of receiving groove 25 also can arrange noise-reducing structure 27, the energy of flow of cold media air can be reduced thus further.

According to an embodiment of the present utility model, one of them in main bearing 22 and supplementary bearing 23 is formed with the silencing groove recessed towards the direction of cylinder 21, between silencing groove and corresponding baffler, limits silencing cavity.Such as shown in Fig. 8, silencing groove is formed to being recessed on by a part for the lower surface of supplementary bearing 23, and silencing groove is roughly ring-type, alternatively, secondary baffler 32 is slab construction, and flat secondary baffler 32 is located at the bottom of supplementary bearing 23 and jointly limits above-mentioned secondary silencing cavity 321 with silencing groove.

Certainly, silencing groove can also be formed by a part for the upper surface of main bearing 22 is recessed downwards, silencing groove is roughly ring-type, alternatively, main baffler 31 is slab construction, and flat main baffler 31 is located at the bottom of main bearing 22 and jointly limits above-mentioned main silencing cavity 311 (scheming not shown) with silencing groove.

Be all known according to other configuration examples of the rotary compressor 100 of the utility model embodiment to those skilled in the art as motor etc. and operation, be not described in detail here.

In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " illustrative examples ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present utility model or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.

Although illustrate and described embodiment of the present utility model, those having ordinary skill in the art will appreciate that: can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present utility model and aim, scope of the present utility model is by claim and equivalents thereof.

Claims (10)

1. a rotary compressor, is characterized in that, comprising:

Housing;

Compressing mechanism, described compressing mechanism is located in described housing, described compressing mechanism comprises cylinder, main bearing and supplementary bearing, described main bearing is located at the top of described cylinder, described supplementary bearing is located at the bottom of described cylinder, described main bearing, between described supplementary bearing and described cylinder, limit compression chamber, described main bearing with at least one in described supplementary bearing is formed with the relief opening be communicated with described compression chamber, described relief opening is communicated with described enclosure interior by exhaust structure;

Main baffler and secondary baffler, described main baffler be located at described main bearing top and and limit main silencing cavity between described main bearing, described secondary baffler be located at described supplementary bearing bottom and and limit secondary silencing cavity between described supplementary bearing;

Wherein said compressing mechanism is provided with communicating passage, and described communicating passage is communicated with described exhaust structure with described relief opening simultaneously, and described communicating passage inwall is provided with noise-reducing structure.

2. rotary compressor according to claim 1, it is characterized in that, described communicating passage comprises the first passage that is communicated with successively to third channel, described first passage to be formed on described main bearing and to run through described main bearing, described third channel to be formed on described supplementary bearing and to run through described supplementary bearing, and described second channel to be formed on described cylinder and to run through described cylinder.

3. rotary compressor according to claim 2, it is characterized in that, described exhaust structure is be formed in the air hole on described main baffler, and the upper end of described first passage is communicated with described main silencing cavity, and the lower end of described third channel is communicated with described secondary silencing cavity.

4. rotary compressor according to claim 2, it is characterized in that, described exhaust structure is be formed in the air hole on described main baffler, and the upper end of described first passage is communicated with described enclosure interior, and the lower end of described third channel is communicated with described secondary silencing cavity.

5. rotary compressor according to claim 2, it is characterized in that, described exhaust structure is be formed in the exhaust passage on described compressing mechanism, the upper end of described exhaust passage is communicated with described enclosure interior, the lower end of described exhaust passage is communicated with described secondary baffler, the upper end of described first passage is communicated with described main silencing cavity, and the lower end of described third channel is communicated with described secondary silencing cavity.

6. rotary compressor according to claim 5, is characterized in that, described exhaust passage inwall is formed with described noise-reducing structure.

7. rotary compressor according to claim 2, is characterized in that, described noise-reducing structure is located on the inwall of at least one in described first passage, described second channel and described third channel.

8. rotary compressor according to claim 2, is characterized in that, the cross-section area of described second channel is greater than the cross-section area of described first passage and described third channel.

9. rotary compressor according to claim 1, is characterized in that, the inner wall roughness scope of described communicating passage is: 0.2mm≤Rz≤5mm.

10. the rotary compressor according to any one of claim 1-9, is characterized in that, described noise-reducing structure is screw thread, annular muscle or projection.