Diffusion type exhaust channel structure of double-screw gas conveying equipment

Abstract

The utility model discloses a diffusion type exhaust passage structure of double-screw gas conveying equipment, which mainly comprises an air cylinder and an axial exhaust pipe arranged on the air cylinder, and the diffusion type exhaust passage structure of the double-screw gas conveying equipment comprises the specially designed axial exhaust pipe. The direction of the airflow in the pipeline is basically consistent with that of the airflow from the compression cavity, so that mechanical loss caused by rapid turning of the airflow in a traditional structure can be avoided. A guide plate device is specially designed at an inlet of the axial exhaust pipe. Air flow from the compression cavity directly flows into the gaps of the guide plates and moves forwards along the guide plates, and energy loss caused by air turbulence in a traditional structure can be reduced. A plurality of diffusion areas are formed at the inlet of the exhaust pipe by utilizing the guide plate and the inner wall of the pipeline, and the dynamic pressure of high-speed airflow from the compression cavity is converted into static pressure by utilizing the diffusion areas, so that the pressure is increased while the speed is reduced, and the energy loss caused by the high-speed airflow is avoided.

Description

Technical Field

[0001] This utility model relates to the technical field of twin-screw gas conveying equipment, specifically to a diffuser-type exhaust channel structure for twin-screw gas conveying equipment. Background Technology

[0002] Twin-screw gas conveying equipment includes twin-screw gas compressors, twin-screw blowers, and twin-screw vacuum pumps.

[0003] Currently, twin-screw gas conveying equipment has one thing in common: the exhaust outlet of the main unit (head) is generally located in the radial direction of the main unit (head). The basic structure places the exhaust port of the main unit at the bottom of the twin-screw main unit, although some products place it at the top and on both axial sides of the twin-screw main unit.

[0004] The airflow direction inside the twin-screw gas conveying equipment is shown in the figure. Figure 1 .

[0005] Depend on Figure 1 It is evident that the airflow direction inside a twin-screw gas conveying system is generally from the inlet to the outlet. When the exhaust outlet of the main unit (head) is located in the radial direction of the main unit (head), the airflow inside the twin-screw gas conveying system inevitably undergoes two sharp turns, which cause a certain loss of gas mechanical energy. Although many products have exhaust grooves on the end plates of the casing, the depth of the exhaust grooves is limited, and the gas injected into the grooves is still refracted back, resulting in significant energy loss in the airflow.

[0006] The second reason for mechanical energy loss is that when the male and female screws sweep across the exhaust port, their end faces at the exhaust port end generate intense turbulence, flow, or eddies. In the turbulent region, the high-speed changes in the fluid and the generation of turbulent vortices lead to continuous energy conversion within the fluid. This internal energy conversion results in mechanical energy loss. Pressure fluctuations exist within turbulence, leading to non-uniform pressure distribution within the fluid, which also causes pressure loss.

[0007] The third reason for mechanical energy loss is that when the male and female screws sweep across the exhaust port, for a short period after their end faces leave the edge of the exhaust port, the opening of the corresponding compression chamber at the exhaust port is not large, meaning the exhaust resistance of the compression chamber is relatively high. At this time, the volume change rate of the compression chamber is very high, which leads to a sharp increase in pressure within the compression chamber, and consequently a sharp increase in the flow velocity at the exhaust port. (The energy loss from the former is self-evident, but there is no countermeasure.) This high-speed airflow inevitably generates mechanical losses during its flow.

[0008] The aforementioned three reasons have each increased the operating noise of the equipment to varying degrees. Utility Model Content

[0009] To address the shortcomings of existing technologies, this invention provides a diffuser-type exhaust channel structure for a twin-screw gas conveying device, effectively solving the problems mentioned in the background section.

[0010] To achieve the above objectives, this utility model is implemented through the following technical solution: a diffuser-type exhaust channel structure for a twin-screw gas conveying device, the main body of which is an axial exhaust pipe on the cylinder. The axial exhaust pipe includes an axial exhaust pipe inlet, an axial exhaust pipe outlet, and a flange. The axial exhaust pipe inlet is connected to the cylinder, and the connection surface includes an exhaust port on the cylinder end plate and an exhaust port on the cylinder side wall. The cross-sectional area of ​​the front end of the axial exhaust pipe is larger than the cross-sectional area of ​​the axial exhaust pipe outlet, and it has a streamlined structure. The exhaust direction of the axial exhaust pipe outlet is parallel to the axial direction of the cylinder.

[0011] Preferably, a guide plate is provided at the inlet of the axial exhaust pipe, so that the airflow from the compression chamber flows directly into the gap of the guide plate and is forced to move forward along the direction of the guide plate.

[0012] Preferably, a first diffuser zone, a second diffuser zone, a third diffuser zone, and a fourth diffuser zone are formed inside the axial exhaust pipe using a guide plate and the inner wall of the pipe.

[0013] Preferably, the axial exhaust pipe is divided into two sections: an axial exhaust pipe cylinder section and an axial exhaust pipe end plate section. The axial exhaust pipe cylinder section is connected to the cylinder as a whole, and the axial exhaust pipe end plate section is connected to the housing end plate as a whole.

[0014] Beneficial effects

[0015] This invention provides a diffuser-type exhaust channel structure for a twin-screw gas conveying device. Compared with the prior art, it has the following advantages:

[0016] 1. The diffuser-type exhaust channel structure of this twin-screw gas conveying equipment features a specially designed axial exhaust pipe. The airflow direction in the pipe is basically consistent with the airflow direction from the compression chamber, which can avoid the mechanical losses caused by the abrupt change in airflow in traditional structures.

[0017] 2. To address the issue of airflow turbulence in traditional structures, a deflector device is specially designed at the inlet of the axial exhaust pipe. The airflow from the compression chamber flows directly into the gaps in the deflector and travels along it, which can significantly reduce the energy loss caused by gas turbulence in traditional structures.

[0018] 3. By utilizing the guide vanes and the inner wall of the pipe, a first diffuser zone, a second diffuser zone, a third diffuser zone, and a fourth diffuser zone are formed. These diffuser zones can convert the dynamic pressure of the high-speed airflow from the compression chamber into static pressure, thereby reducing the velocity while increasing the pressure and avoiding energy loss caused by the high-speed airflow.

[0019] 4. Reduces airflow impact and decreases mechanical vibration and airflow noise during operation. Attached Figure Description

[0020] Figure 1 A schematic diagram of the exhaust port of the compression chamber in an existing twin-screw gas conveying device;

[0021] Figure 2 This is a schematic diagram of the airflow direction inside an existing twin-screw gas conveying device.

[0022] Figure 3 This is a general structural drawing of the present utility model;

[0023] Figure 4 This is a structural diagram of an axial exhaust pipe;

[0024] Figure 5 Detailed view of the horizontal cross-section of the axial exhaust pipe;

[0025] Figure 6 This is a schematic diagram of embodiment 4 of the axial exhaust pipe.

[0026] In the diagram: Cylinder---1, Female screw---2, Male screw---3, Cylinder end plate exhaust port---4, Cylinder side wall exhaust port---5, Compression chamber---6, Compression chamber airflow---7, Radial exhaust pipe outlet---8, Axial exhaust pipe outlet---9, Radial exhaust channel---10, Axial exhaust pipe---11, Axial exhaust pipe inlet---12, Guide plate---13, First diffuser zone---14, Second diffuser zone---15, Third diffuser zone---16, Fourth diffuser zone---17, Bearing---18, Housing end plate---19, Axial exhaust pipe cylinder section---20, Axial exhaust pipe end plate section---21, Flange---22. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figure 1-6This utility model provides four technical solutions, specifically including the following embodiments:

[0029] Example 1

[0030] A diffuser-type exhaust channel structure for a twin-screw gas conveying device, the main body of which is an axial exhaust pipe 11, including an axial exhaust pipe inlet 12, an axial exhaust pipe outlet 9, and a flange 22.

[0031] The axial exhaust pipe inlet 12 is connected to the cylinder, and the connection surface includes the cylinder end plate exhaust port 4 and the cylinder side wall exhaust port 5. The cylinder end plate exhaust port 4 is... Figure 3 The area enclosed by the dotted line is the triangular area below the cylinder end plate exhaust port 4, which is the cylinder side wall exhaust port 5. The axial exhaust pipe 11 has a large cross-section and its passage has no obvious bends, and it has a streamlined structure overall. The exhaust direction of the axial exhaust pipe outlet 9 is parallel to the axis of cylinder 1.

[0032] The advantage of this structure is that it has low gas resistance and low mechanical energy loss of the gas.

[0033] Example 2

[0034] A diffuser-type exhaust channel structure for a twin-screw gas conveying device is the same as in Embodiment 1, except that a guide plate 13 is provided at the inlet of the axial exhaust pipe 11. Figure 4 , Figure 5 The airflow from the compression chamber 7 flows directly into the gap of the guide plate, forcing it to move forward along the guide plate, which can significantly reduce the energy loss and vibration noise caused by gas turbulence in traditional structures.

[0035] Example 3

[0036] A diffuser-type exhaust channel structure for a twin-screw gas conveying device is the same as that in Embodiment 2, except that... Figure 4 , Figure 5 Inside the axial exhaust pipe 11, a first diffuser zone 14, a second diffuser zone 15, a third diffuser zone 16, and a fourth diffuser zone 17 are formed using the guide plate 13 and the inner wall of the pipe. In these diffuser zones, the cross-section along the airflow direction simultaneously widens in both the horizontal and vertical directions, which can decelerate the high-speed airflow from the compression chamber and convert dynamic pressure energy into static pressure energy. While reducing speed, it increases pressure, avoiding energy loss caused by disordered jetting of high-speed airflow, and also effectively suppressing the noise of airflow impact.

[0037] Example 4

[0038] A diffuser-type exhaust channel structure for a twin-screw gas conveying device is the same as that in Embodiment 3, except that: see Figure 6The axial exhaust pipe 11 is divided into two sections: an axial exhaust pipe cylinder section 20 and an axial exhaust pipe end plate section 21. The axial exhaust pipe cylinder section 20 is connected to the cylinder 1 as a whole, and the axial exhaust pipe end plate section 21 is connected to the housing end plate 19 as a whole. A bearing 18 is provided on the housing end plate 19.

[0039] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used only 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. Furthermore, 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 process, method, article, or apparatus.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A diffuser-type exhaust channel structure for a twin-screw gas conveying device, characterized in that: The main body includes a cylinder (1) and an axial exhaust pipe (11) disposed on the cylinder (1). The axial exhaust pipe (11) includes an axial exhaust pipe inlet (12), an axial exhaust pipe outlet (9), and a flange (22). The axial exhaust pipe inlet (12) is connected to the cylinder (1). The connection surface includes an exhaust port (4) on the cylinder end plate and an exhaust port (5) on the cylinder side wall. The cross-sectional area of ​​the front end of the axial exhaust pipe (11) is larger than the cross-sectional area of ​​the axial exhaust pipe outlet (9), and it has a streamlined structure. The exhaust direction of the axial exhaust pipe outlet (9) is parallel to the axis of the cylinder (1).

2. The diffuser-type exhaust channel structure of a twin-screw gas conveying device according to claim 1, characterized in that: A guide plate (13) is provided at the inlet of the axial exhaust pipe (11). The airflow from the compression chamber (6) flows directly into the gap of the guide plate, forcing it to move forward along the direction of the guide plate.

3. The diffuser-type exhaust channel structure of a twin-screw gas conveying device according to claim 2, characterized in that: Inside the axial exhaust pipe (11), a first diffuser zone (14), a second diffuser zone (15), a third diffuser zone (16), and a fourth diffuser zone (17) are formed by using a guide plate (13) and the inner wall of the pipe.

4. The diffuser-type exhaust channel structure of a twin-screw gas conveying device according to claim 1, characterized in that: The axial exhaust pipe (11) is divided into two sections: one is the axial exhaust pipe cylinder section (20), and the other is the axial exhaust pipe end plate section (21). The axial exhaust pipe cylinder section (20) is connected to the cylinder (1) as a whole, and the axial exhaust pipe end plate section (21) is connected to the housing end plate (19) as a whole.

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