CN106762671A - Exhaust pipe structure and compressor - Google Patents

Abstract

The invention provides an exhaust pipe structure and a compressor. According to the exhaust pipe structure, the exhaust pipe has a tapered section and a divergent section inside along the airflow direction. By arranging the tapered section and the gradually expanding section, the oil-gas mixture can collide with the inner wall surface of the tapered section of the exhaust pipe in the exhaust process, so that oil and gas are separated. Then through the divergent section, the air flow expands gradually and finally is discharged out of the exhaust pipe more uniformly. Compared with the existing exhaust process, the whole process has the advantages that the flow channel is obviously prolonged, the collision separation process is added, and the oil content efficiency is effectively improved.

Description

Exhaust pipe structure and compressor

technical field

The invention relates to the field of compressors, in particular to an exhaust pipe structure and a compressor.

Background technique

At present, the structure of the screw compressor is relatively small, the internal space is compact, the flow field distribution at the exhaust end is uneven, and the flow path in some places is too short, resulting in the oil and gas being separated before they are completely separated, and the oil separation efficiency is relatively low. Because the oil separation efficiency is not high, the system needs to increase its oil return volume to ensure the stable operation of the compressor. The increase in the oil return volume will greatly affect the volumetric efficiency of the compressor, resulting in a decrease in the performance of the compressor.

Contents of the invention

The present invention aims to provide an exhaust pipe structure and a compressor capable of improving oil separation efficiency.

The invention provides an exhaust pipe structure. Along the direction of air flow, the inside of the exhaust pipe has a tapered section and a gradually expanded section.

Further, the end of the tapering section is connected to the head end of the expanding section.

Further, a guide groove is provided on the inner wall of the tapered section.

Further, the guide groove is a spiral guide groove.

Further, the tapered section is a tapered tapered section, and the tapered section is a tapered tapered section.

Further, the taper angle of the tapered tapered section is greater than the taper angle of the tapered tapered section.

Further, the taper angle α of the conical tapering section is 20° to 30°.

Further, α is 28°.

Further, the cone angle β of the tapered diverging section is 20° to 30°.

Further, β is 22°.

The present invention also provides a compressor, including the aforementioned exhaust pipe structure.

According to the discharge pipe structure and compressor of the present invention, by setting the tapered section and the tapered section, the oil-gas mixture will collide with the inner wall surface of the tapered section of the exhaust pipe during the exhaust process, so that the oil and gas are separated. Then through the gradual expansion section, the airflow gradually expands, and finally exits the exhaust pipe more evenly. Compared with the existing exhaust process, the entire process has a significantly longer flow path, and increases the collision separation process, effectively improving the oil separation efficiency.

Description of drawings

The accompanying drawings constituting a part of this application are used to provide further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

Fig. 1 is a schematic diagram of an axial sectional structure of an exhaust pipe structure according to the present invention.

Explanation of reference signs:

10. Converging section; 11. Diversion groove; 20. Gradually expanding section.

detailed description

The present invention will be described in detail below with reference to the accompanying drawings and examples.

As shown in FIG. 1 , according to the structure of the exhaust pipe of the present invention, along the direction of air flow, there is a tapered section 10 and a divergent section 20 inside the exhaust pipe. In the present invention, by setting the tapering section 10 and the diverging section 20, the oil-gas mixture will collide with the inner wall surface of the exhaust pipe tapering section 10 during the exhaust process, so that the oil and gas are separated. Then through the gradual expansion section 20, the airflow expands gradually, and finally discharges out the exhaust pipe relatively uniformly. Compared with the existing exhaust process, the entire process has a significantly longer flow path, and increases the collision separation process, effectively improving the oil separation efficiency.

Specifically, the end of the converging section 10 is connected to the head end of the diverging section 20, so that the airflow passing through the converging section 10 can immediately enter the diverging section 20 to expand, thereby increasing the bypassing effect and improving the separation efficiency.

Preferably, a diversion groove 11 is provided on the inner wall of the tapered section 10, which is beneficial to improve the separation effect on the one hand, and facilitates the return of separated oil on the other hand. More preferably, the guide groove 11 is a spiral guide groove 11, so as to promote the rotation of the oil-gas mixture and improve the oil-gas separation efficiency under the action of centrifugal force.

As shown in FIG. 1 , in the present invention, the tapered section 10 is a tapered tapered section, and the tapered section 20 is a tapered tapered section, so that the airflow can shrink and expand evenly, and it is also convenient for processing. Generally, the cone angle of the tapered tapered section is larger than that of the tapered tapered section, which is more conducive to the collision and separation of oil and gas, and enhances the oil separation efficiency.

The cone angle of the conical tapering section, the cone angle of the conical diverging section and the design of the guide groove 11 need to consider the exhaust flow rate of different models and the pressure loss. Generally, the principle of selecting the cone angle is to increase the length of the flow channel as much as possible under the premise of satisfying the pressure and flow rate. The length of the exhaust pipe is defined as the standard length. After calculation, the taper angle α of the tapered section 10 is better at 20° to 30°; preferably, α is 28°. The taper angle β of the diverging section 20 is selected to be 20° to 30°, and the effect is better; preferably, β is 22°. The design of the diversion groove 11 mainly considers reducing the pressure loss and prolonging the length of the flow channel. Optimizing the diversion groove 11 can ensure relatively uniform flow velocity at the outlet by simulating the flow field inside the pipeline. According to the analysis and correction, the helical guide groove 11 exhausts the most uniformly and the pressure loss is relatively small. The reasonable design of the cone angle and the guide groove 11 can ensure that the flow loss of the airflow through the exhaust pipe is as small as possible, and the exhaust More uniform, and high oil and gas separation efficiency.

The present invention also provides a compressor, which includes the aforementioned exhaust pipe structure, thereby improving the oil separation efficiency, not only reducing the overall size of the compressor, but also improving the performance coefficient of the compressor. If the oil separation efficiency is high enough, the external oil separation can even be simplified to reduce the size of the whole machine.

From the above description, it can be seen that the above-mentioned embodiments of the present invention have achieved the following technical effects:

According to the discharge pipe structure and compressor of the present invention, by setting the constriction section 10 and the divergence section 20, the oil-gas mixture will collide with the inner wall of the discharge pipe constriction section 10 during the exhaust process, so that the oil and gas are separated. Then through the gradual expansion section 20, the airflow expands gradually, and finally discharges out the exhaust pipe relatively uniformly. Compared with the existing exhaust process, the entire process has a significantly longer flow path, and increases the collision separation process, effectively improving the oil separation efficiency.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (11)

1. An exhaust pipe structure, characterized in that, along the airflow direction, the inside of the exhaust pipe has a tapering section (10) and a diverging section (20). 2. The exhaust pipe structure according to claim 1, characterized in that, The end of the tapering section (10) is connected to the head end of the expanding section (20). 3. The exhaust pipe structure according to claim 1, characterized in that, A guide groove (11) is arranged on the inner wall of the tapered section (10). 4. The exhaust pipe structure according to claim 3, characterized in that, The guide groove (11) is a spiral guide groove (11). 5. The exhaust pipe structure according to claim 1, characterized in that, The tapered section (10) is a tapered tapered section, and the tapered section (20) is a tapered tapered section. 6. The exhaust pipe structure according to claim 5, characterized in that, The cone angle of the tapered tapered section is larger than the cone angle of the tapered tapered section. 7. The exhaust pipe structure according to claim 5 or 6, characterized in that, The cone angle α of the tapered tapering section is 20° to 30°. 8. The exhaust pipe structure according to claim 7, characterized in that, α is 28°. 9. The exhaust pipe structure according to claim 5 or 6, characterized in that, The cone angle β of the tapered diverging section is 20° to 30°. 10. The exhaust pipe structure according to claim 9, characterized in that, β is 22°. 11. A compressor, comprising a discharge pipe structure, characterized in that the discharge pipe structure is the discharge pipe structure according to any one of claims 1-10.