Exhaust housing for a twin screw compressor and twin screw compressor

Abstract

The utility model relates to a kind of exhaust casing and double screw compressor for double screw compressor, exhaust casing is provided with exhaust orifice, exhaust casing is opened with a unloading groove at the end sharp angle corresponding to male and female rotor engagement line, the groove body of unloading groove takes end sharp angle as starting point, and it is inclined to the direction of female rotor and extends to communicate with exhaust orifice. By setting unloading groove on exhaust casing, and the starting point of unloading groove is accurately set at the end sharp angle of engagement line, gas in exhaust closed volume can be smoothly introduced into exhaust orifice at the beginning of pressure rise, so that excessive compression of gas is avoided, thereby significantly reducing the power consumption and operating noise of compressor. Moreover, the design of unloading groove extending obliquely to the direction of female rotor greatly reduces the area of unloading groove inside the engagement line, thereby effectively avoiding the communication between unloading groove and the low-pressure tooth volume on the other side that is increasing, thereby preventing the backflow of high-pressure gas through unloading groove to low-pressure area.

Description

Technical Field

[0001] This utility model relates to the field of twin-screw compressor technology, and in particular to an exhaust casing for a twin-screw compressor and a twin-screw compressor. Background Technology

[0002] like Figure 1 As shown, the twin-screw compressor relies on a pair of meshing female rotors 1 and male rotors 2 rotating inside the exhaust casing 3 to compress gas. During operation, these male and female rotors form an exhaust closed volume 4 at the exhaust end, such as... Figure 2 The crescent-shaped area shown. As the rotor continues to rotate, the area of ​​this region will become smaller and smaller, causing the gas trapped within to be violently compressed and the pressure to rise sharply. If the high-pressure gas cannot be discharged in a timely and smooth manner, it will lead to a significant increase in compressor power consumption, increased operating noise, and affect product stability.

[0003] Because modern high-performance screw compressors generally employ asymmetrical profile designs to improve efficiency, as the exhaust sealed volume 4 decreases, an inter-tooth volume 5, located inside the meshing line 6, is formed adjacent to it, with its volume continuously increasing. This places extremely stringent requirements on the exhaust end design: the exhaust port on the exhaust housing 3 must ensure that the high-pressure gas in the exhaust sealed volume 4 can be released in a timely manner, while simultaneously avoiding communication with the inter-tooth volume 5 as much as possible. Otherwise, when the inter-tooth volume 5 connects to the exhaust port, the high-pressure gas that has reached the exhaust pressure will flow back from the exhaust chamber into the lower-pressure inter-tooth volume 5, causing severe gas backflow and directly reducing the compressor's volumetric efficiency and overall energy efficiency.

[0004] However, realizing this ideal design faces a fundamental technical obstacle. For example... Figure 1 As shown, the end of the meshing line 6 between the female rotor 1 and the male rotor 2 inevitably has a geometric sharp angle. This sharp angle is the root cause of the exhaust closed volume 4. During the manufacturing process, due to limitations in casting technology (such as draft angle, fillet, etc.), the inner wall of the exhaust shell formed by conventional casting methods cannot perfectly "embed" this sharp angle area, and therefore cannot fundamentally eliminate the exhaust closed volume 4. Utility Model Content

[0005] The purpose of this invention is to provide an exhaust casing for a twin-screw compressor and a twin-screw compressor, which can smoothly guide the gas inside the exhaust sealed volume into the exhaust port at the beginning of the pressure rise, avoiding the gas being over-compressed. At the same time, it can also effectively prevent the unloading groove from communicating with the inter-tooth volume, thereby preventing high-pressure gas from flowing back to the low-pressure area through the unloading groove, ensuring the volumetric efficiency and overall energy efficiency of the compressor.

[0006] To achieve the above objectives, this utility model provides an exhaust housing for a twin-screw compressor. The exhaust housing is provided with an exhaust port. The exhaust housing has an unloading groove at the end of the end of the male and female rotor meshing line. The unloading groove starts from the end of the end and extends obliquely towards the direction of the female rotor until it communicates with the exhaust port.

[0007] Optionally, the unloading groove is a long strip-shaped groove.

[0008] Optionally, the unloading groove is formed by machining.

[0009] Optionally, the cross-sectional shape of the unloading groove is adapted to the cross-sectional shape of the cutter head of a standard milling cutter.

[0010] Optionally, the width of the unloading groove is equal to the diameter of the selected standard milling cutter.

[0011] Optionally, the unloading groove is configured such that when the male and female rotors are running, the first end of the unloading groove can be connected to the crescent-shaped exhaust closed volume formed by the tooth surfaces of the male and female rotors.

[0012] Optionally, the tail end of the unloading groove is located outside the meshing line of the male and female rotors.

[0013] Optionally, the extension direction of the unloading groove forms an acute angle with the line connecting the axes of the male and female rotors.

[0014] Based on this, the present invention also provides a twin-screw compressor, including a male rotor, a female rotor, and an exhaust housing for the twin-screw compressor as described above, wherein a chamber is formed inside the exhaust housing, and the male rotor and the female rotor are housed in the chamber and mesh with each other.

[0015] The exhaust casing for a twin-screw compressor and the twin-screw compressor provided by this utility model have at least one of the following beneficial effects:

[0016] 1) Effective pressure relief, reducing power consumption and noise: By setting unloading grooves on the exhaust housing and precisely setting the starting point of the unloading grooves at the sharp corner of the end of the meshing line, the gas inside can be smoothly introduced into the exhaust port at the beginning of the pressure rise in the exhaust closed volume, avoiding the gas being over-compressed, thereby significantly reducing the power consumption and operating noise of the compressor.

[0017] 2) Prevent gas backflow and improve energy efficiency: The design of the unloading groove extending inclined towards the male rotor ensures that its tail end is quickly located outside the meshing line, effectively isolating the passage between the exhaust port and the inter-tooth volume, preventing high-pressure gas backflow, and ensuring the volumetric efficiency and overall energy efficiency of the compressor.

[0018] 3) Simple structure and easy processing: The unloading groove can be machined in one go using a standard milling cutter, without the need for complicated special processes. It is easy and cheap to manufacture, making it very suitable for industrial production.

[0019] 4) Improved product stability: Eliminates periodic pressure shocks and vibrations caused by the exhaust sealed volume, improving the compressor's operational stability and component lifespan. Attached Figure Description

[0020] Those skilled in the art will understand that the accompanying drawings are provided to better understand the present invention and do not constitute any limitation on the scope of the present invention. Wherein:

[0021] Figure 1 This is a schematic diagram of the meshing of the male and female rotors in a twin-screw compressor in the prior art;

[0022] Figure 2 This is a schematic diagram of the meshing line of male and female rotors in the prior art;

[0023] Figure 3 This is an overall schematic diagram of the exhaust housing for a twin-screw compressor provided in an embodiment of the present invention.

[0024] The attached figures are labeled as follows:

[0025] 1-Female rotor; 2-Male rotor; 3-Exhaust housing; 4-Exhaust sealed volume; 5-Inter-tooth volume; 6-Line of engagement;

[0026] 100 - Exhaust housing; 200 - Exhaust port; 300 - Unloading groove. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0029] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] Furthermore, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or apparatus that includes said element. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] Please refer to Figure 3 This utility model provides an exhaust housing 100 for a twin-screw compressor. The exhaust housing 100 is provided with an exhaust port 200. An unloading groove 300 is formed at the end of the exhaust housing 100 corresponding to the end of the male and female rotor meshing line. The groove of the unloading groove 300 starts from the end of the end and extends obliquely towards the direction of the female rotor until it communicates with the exhaust port 200.

[0032] By providing an unloading groove 300 on the exhaust housing 100, the gas inside the exhaust closed volume can be smoothly guided into the exhaust port 200 at the initial stage of pressure increase, avoiding excessive compression of the gas and thus significantly reducing the compressor's power consumption and operating noise. Furthermore, by precisely setting the starting point of the unloading groove 300 at the sharp corner of the meshing line, it is ensured that the inlet of the unloading groove 300 is located precisely at the "source" of the exhaust closed volume formation. This is equivalent to opening a pressure relief valve at the source of the exhaust closed volume formation, ensuring that the gas can be quickly discharged before excessive pressure increases. Even further, the design of the unloading groove 300 extending inclined towards the female rotor greatly reduces the area of ​​the unloading groove 300 inside the meshing line, effectively preventing the unloading groove 300 from communicating with the increasing low-pressure inter-tooth volume on the other side. This prevents high-pressure gas from flowing back into the low-pressure area through the unloading groove 300, ensuring the compressor's volumetric efficiency and overall energy efficiency.

[0033] In this embodiment, the unloading groove 300 is preferably an elongated groove. This shape is simple, provides smooth airflow, has low flow resistance, and is very easy to machine using milling cutters or the like.

[0034] In this embodiment, the unloading groove 300 is preferably formed by machining (such as milling). Specifically, a standard milling cutter can be used for machining, so the cross-sectional shape of the unloading groove 300 is adapted to the cross-sectional shape of the selected standard milling cutter tip, which is usually an arc shape, which greatly reduces the machining difficulty and manufacturing cost.

[0035] To ensure machining accuracy and consistency, the width (i.e., opening width) of the unloading groove 300 is equal to the diameter of the selected standard milling cutter. This makes the machining process easy to control and ensures the stability of product quality.

[0036] like Figure 3 As shown, the unloading groove 300 is configured such that when the male and female rotors are rotating, the first end of the unloading groove 300 can communicate with the crescent-shaped exhaust closed volume formed by the tooth surfaces of the male and female rotors. At the same time, due to its unique inclined design, the tail end of the unloading groove 300 is located outside the area of ​​the meshing line, ensuring that the unloading groove 300 does not communicate with the inter-tooth volume, thereby perfectly avoiding the problem of high-pressure gas backflow.

[0037] In this embodiment, the extension direction of the unloading groove 300 forms an acute angle with the line connecting the axes of the male and female rotors (not shown in the figure, but can be understood as the straight line connecting the centers of the two rotors).

[0038] Based on the same technical concept, this utility model embodiment also provides a twin-screw compressor, including a male rotor, a female rotor, and an exhaust housing 100 for the twin-screw compressor as described above. The exhaust housing 100 has a chamber inside, and the male rotor and the female rotor are housed in the chamber and mesh with each other.

[0039] Since the twin-screw compressor provided by this utility model belongs to the same technical concept as the exhaust casing 100 for the twin-screw compressor described above, the twin-screw compressor provided by this utility model has all the advantages of the exhaust casing 100 for the twin-screw compressor described above. Therefore, the beneficial effects of the twin-screw compressor provided by this utility model will not be described in detail here.

[0040] In summary, the exhaust casing 100 and the twin-screw compressor provided by this utility model, by setting an unloading groove 300 on the exhaust casing 100 and precisely setting the starting point of the unloading groove 300 at the sharp corner of the end of the meshing line, can smoothly guide the gas inside into the exhaust port 200 at the beginning of the pressure rise in the exhaust closed volume, avoiding over-compression of the gas, thereby significantly reducing the power consumption and operating noise of the compressor. Furthermore, the design of the unloading groove 300 extending obliquely towards the female rotor greatly reduces the area of ​​the unloading groove 300 located inside the meshing line, thus effectively preventing the unloading groove 300 from communicating with the increasing low-pressure inter-tooth volume on the other side, thereby preventing high-pressure gas from flowing back to the low-pressure area through the unloading groove 300, ensuring the volumetric efficiency and overall energy efficiency of the compressor. In addition, the unloading groove 300 can be machined in one step using a standard milling cutter, without the need for complex special processes, resulting in low manufacturing difficulty and cost, making it very suitable for industrial production.

[0041] The above description is merely a description of a preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the present utility model. Obviously, those skilled in the art can make various modifications and variations to the present utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the present utility model and its equivalents, the present utility model also intends to include these modifications and variations.

Claims

1. An exhaust housing for a twin-screw compressor, wherein the exhaust housing is provided with an exhaust port, characterized in that, The exhaust housing has an unloading groove at the end of the pointed corner corresponding to the meshing line of the male and female rotors. The groove body of the unloading groove starts from the pointed corner and extends obliquely towards the direction of the female rotor until it communicates with the exhaust port.

2. The exhaust casing for a twin-screw compressor according to claim 1, characterized in that, The unloading groove is a long, narrow groove.

3. The exhaust casing for a twin-screw compressor according to claim 1, characterized in that, The unloading groove is formed by machining.

4. The exhaust casing for a twin-screw compressor according to claim 1 or 3, characterized in that, The cross-sectional shape of the unloading groove is adapted to the cross-sectional shape of the standard milling cutter tip.

5. The exhaust casing for a twin-screw compressor according to claim 4, characterized in that, The width of the unloading groove is equal to the diameter of the selected standard milling cutter.

6. The exhaust casing for a twin-screw compressor according to claim 1, characterized in that, The unloading groove is configured such that when the male and female rotors are running, the first end of the unloading groove can be connected to the crescent-shaped exhaust closed volume formed by the tooth surfaces of the male and female rotors.

7. The exhaust casing for a twin-screw compressor according to claim 1, characterized in that, The tail end of the unloading groove is located outside the meshing line of the male and female rotors.

8. The exhaust casing for a twin-screw compressor according to claim 1, characterized in that, The extension direction of the unloading groove forms an acute angle with the line connecting the axes of the male and female rotors.

9. A twin-screw compressor, characterized in that, The invention includes a male rotor, a female rotor, and an exhaust housing for a twin-screw compressor according to any one of claims 1-8, wherein a chamber is formed inside the exhaust housing, and the male rotor and the female rotor are housed in the chamber and mesh with each other.

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