Exhaust and noise elimination structure of screw compressor

Abstract

The utility model relates to an exhaust noise elimination structure of a screw compressor, which comprises an exhaust bearing seat, a male rotor cavity and a female rotor cavity are arranged on the exhaust bearing seat, a male rotor is arranged in the male rotor cavity, and a female rotor is arranged in the female rotor cavity; the exhaust bearing seat is also provided with an exhaust port; the exhaust port is positioned at the lower parts of the male rotor cavity and the female rotor cavity; at least five silencing cavities are formed in the exhaust port, the depths of all the silencing cavities are different, and a gap is reserved between every two adjacent silencing cavities. According to the exhaust and noise elimination structure of the screw compressor, the at least five noise elimination cavities are formed in the exhaust port, the depths of the noise elimination cavities are different, that is, the multiple noise elimination cavities are arranged at the exhaust port, with the largest airflow noise, of the compressor, and the different depths of the noise elimination cavities have different resonant frequencies; air flow energy at the exhaust port is consumed through resonance of the silencing cavity, the exhaust and silencing effects are achieved, and therefore the exhaust noise of the screw compressor is reduced.

Description

Technical Field

[0001] The utility model relates to a noise reduction structure, in particular to an exhaust noise reduction structure for a screw compressor. Background Art

[0002] Screw compressors have the characteristics of smooth operation, strong impact resistance, and small number of wearing parts. They are widely used in compressing gases such as refrigerants and air. Twin-screw compressors consist of a pair of male and female rotors assembled in parallel in the shell. Generally, the main driving side is the male rotor and the driven side is the female rotor. The male rotor drives the female rotor to rotate, realizing the suction, compression, and exhaust processes.

[0003] Screw compressors generate huge noise during the exhaust process, especially at the compressor exhaust port. Due to the compressed airflow and the instantaneous flow at the exhaust end, noise will be generated. The noise is mainly divided into mechanical noise and airflow noise. Airflow noise accounts for the largest proportion. Therefore, how to eliminate the exhaust airflow noise of screw compressors is a technical challenge in the industry. Utility Model Content

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the present invention proposes an exhaust silencer structure for a screw compressor.

[0005] The technical solution adopted by the utility model to solve the technical problem is: a screw compressor exhaust silencer structure, including an exhaust bearing seat, the exhaust bearing seat is provided with a male rotor cavity and a female rotor cavity, the male rotor cavity is provided with a male rotor, and the female rotor cavity is provided with a female rotor;

[0006] The exhaust bearing seat is also provided with an exhaust port, which is located at the lower part of the male rotor cavity and the female rotor cavity;

[0007] At least five muffler cavities are provided at the exhaust port, the depth of each muffler cavity is different, and there is a distance between adjacent muffler cavities.

[0008] In a preferred embodiment of the present invention, the exhaust port is V-shaped, and each of the muffler chambers is arranged at the V-shaped opening of the exhaust port.

[0009] In a preferred embodiment of the present invention, the diameters of the plurality of muffler cavities are the same, and the diameter of the muffler cavities is 10-20 mm.

[0010] In a preferred embodiment of the present invention, the depths of the plurality of muffler cavities are sequentially arranged from shallow to deep from one end of the exhaust port to the other end.

[0011] In a preferred embodiment of the present invention, there are five muffler chambers.

[0012] The beneficial effects of the present utility model are as follows: the exhaust silencer structure of the screw compressor of the present application is realized by arranging no less than 5 silencer chambers at the exhaust port, and the depth of each silencer chamber is different, that is, multiple silencer chambers are arranged at the exhaust port where the airflow noise of the compressor is the largest, and different silencer chamber depths have different resonance frequencies. The resonance of the silencer chamber consumes the airflow energy at the exhaust port to achieve the effect of exhaust silencer, thereby reducing the exhaust noise of the screw compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the utility model;

[0014] Figure 2 This is a schematic diagram of the structure of the muffler cavity at the exhaust port;

[0015] Figure 3 yes Figure 2 A in the middle is an enlarged structural diagram;

[0016] Figure 4 It is a schematic diagram of the structure of the anechoic cavity with different depths;

[0017] In the figure: exhaust bearing seat 1; male rotor cavity 2; female rotor cavity 3; exhaust port 4; muffler cavity 5; muffler cavity 1 501; muffler cavity 2 502; muffler cavity 3 503; muffler cavity 4 504; muffler cavity 5 505. DETAILED DESCRIPTION

[0018] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0020] like Figures 1 to 4 The exhaust muffler structure of a screw compressor shown in the figure includes an exhaust bearing seat 1, on which a male rotor cavity 2 and a female rotor cavity 3 are provided. A male rotor is provided in the male rotor cavity 2, and a female rotor is provided in the female rotor cavity 3.

[0021] The exhaust bearing seat 1 is further provided with an exhaust port 4, which is located at the lower part of the male rotor cavity 2 and the female rotor cavity 3;

[0022] At least five muffler cavities 5 are provided at the exhaust port 4, each of which has a different depth, and a spacing is left between adjacent muffler cavities 5. As a preferred embodiment, the exhaust port 4 in the present application is V-shaped, and each of the muffler cavities 5 is provided at the V-shaped opening of the exhaust port 4.

[0023] The male rotor and female rotor in the present application are respectively installed in the corresponding male rotor cavity 2 and female rotor cavity 3. The lower part of the male rotor cavity 2 and the female rotor cavity 3 is provided with a V-shaped compressor exhaust port 4. All compressed gases are discharged through the V-shaped exhaust port 4. At the V-shaped port, due to the fastest flow rate of the air flow, very loud noise will be generated. The noise can be divided into mechanical noise and airflow noise, among which the airflow noise has the greatest impact. The frequency of the noise is distributed in different frequency bands, and the fundamental frequency of the noise is related to the frequency of the rotor connection exhaust port. Calculated based on the number of teeth of the male rotor as 5, the frequency of the rotor rotation is 50Hz, then the frequency of the rotor and the exhaust port connection per second is 5X50=250Hz.

[0024] As a preferred embodiment, the diameters of the multiple muffler chambers 5 are the same. There are five muffler chambers 5 in this application. From one side of the exhaust port to the other side, they are muffler chamber 1 501 with a depth of L1, muffler chamber 2 502 with a depth of L2, muffler chamber 3 503 with a depth of L3, muffler chamber 4 504 with a depth of L4, and muffler chamber 5 505 with a depth of L5. The five muffler chambers are arranged around the V-shaped exhaust port. The diameters of the five muffler chambers in this application are consistent. Specifically, the diameters of the five muffler chambers are 10-20 mm. Muffler chambers with the same diameter are convenient for opening holes on the exhaust bearing seat body. The depths of the muffler chambers are processed according to different resonant frequencies. When the compressor exhaust passes through the muffler chamber, different vibration frequencies will be generated, thereby achieving the effect of consuming the exhaust noise energy and effectively reducing the noise at the compressor exhaust port. More specifically, in this application, the depths of the multiple muffler chambers 5 are set from shallow to deep from one end of the exhaust port 4 to the other end. In the present application, the depth of the muffler chamber is set from shallow to deep from the muffler chamber one to the muffler chamber five.

[0025] Since the location where the compressor airflow noise is the largest is the exhaust port, the screw compressor exhaust silencer structure of the present application is configured by setting no less than 5 silencer chambers at the exhaust port 4, and the depth of each silencer chamber 5 is different, that is, multiple silencer chambers are arranged at the exhaust port where the compressor airflow noise is the largest. Different silencer chamber depths have different resonance frequencies, and the resonance of the silencer chamber consumes the airflow energy at the exhaust port to achieve the effect of exhaust silencer, thereby reducing the exhaust noise of the screw compressor.

[0026] The muffler cavity in this application is arranged at the exhaust port, that is, the muffler cavity is arranged on the exhaust flow channel. According to the Helmholtz principle, the frequency of the resonant cavity is:

[0027]

[0028] Where, f is the frequency; c is the speed of light; Ac is the aperture area of the anechoic cavity; V is the volume of the anechoic cavity; l is the depth of the anechoic cavity;

[0029] From the above formula, we can see that when Ac is equal, the greater the depth of the anechoic chamber, the larger the volume V, and the smaller the frequency f. When eliminating low frequencies, the depth of the anechoic chamber must be increased, and when eliminating high frequencies, the depth of the anechoic chamber must be reduced. Therefore, to eliminate noise from 250-1250Hz, the noise elimination frequencies are 250Hz, 500Hz, 750Hz, 1000Hz, and 1250Hz, respectively, corresponding to the fundamental frequency of 250Hz. The frequencies above the fifth harmonic have little impact on the noise level and generally do not need to be considered.

[0030] The present application discloses a screw compressor exhaust silencer structure with no fewer than five silencer chambers, designed for the screw compressor's airflow frequency of 250-1250Hz. Different silencer chambers have different resonant frequencies, and through the resonance of these different silencer chambers, the energy of the airflow is consumed, achieving the purpose of eliminating airflow noise. The present application directly opens a hole, or silencer chamber, in the exhaust port of the exhaust bearing seat. The holes of the silencer chambers have the same diameter, and different silencer chamber depths are designed according to different resonant frequencies. Because the silencer chambers are cast as one piece, they avoid the problem of large vibrations during resonance, resulting in stable performance and high reliability.

[0031] Throughout this specification, references to terms such as "one embodiment," "certain embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" indicate that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0032] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. A person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined in the claims.

Claims

1. A screw compressor exhaust silencer structure, characterized in that: It comprises an exhaust bearing seat (1), wherein a male rotor cavity (2) and a female rotor cavity (3) are provided on the exhaust bearing seat (1), a male rotor is provided in the male rotor cavity (2), and a female rotor is provided in the female rotor cavity (3); The exhaust bearing seat (1) is further provided with an exhaust port (4), and the exhaust port (4) is located at the lower part of the male rotor cavity (2) and the female rotor cavity (3); At least five muffler cavities (5) are provided at the exhaust port (4), the depth of each muffler cavity (5) is different, and a distance is left between adjacent muffler cavities (5).

2. The screw compressor exhaust silencer structure according to claim 1, characterized in that: The exhaust port (4) is V-shaped, and each of the muffler cavities (5) is arranged at the V-shaped opening of the exhaust port (4).

3. The screw compressor exhaust silencer structure according to claim 1, characterized in that: The diameters of the plurality of muffler cavities (5) are all the same, and the diameter of the muffler cavities (5) is 10-20 mm.

4. The screw compressor exhaust silencer structure according to claim 3, characterized in that: The depths of the plurality of muffler cavities (5) are sequentially arranged from shallow to deep from one end of the exhaust port (4) to the other end.

5. The screw compressor exhaust silencer structure according to any one of claims 1 to 4, characterized in that: There are five muffler cavities (5).

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