High-pressure-resistant screw expander shell

Abstract

The utility model discloses a high pressure resistant screw expander shell, the appearance of the shell is set to be oval, the loading capacity of the shell is increased, one side of the shell is provided with a flange, the shell is internally provided with a screw cavity, the outer side of the middle position of a steam inlet area of the screw cavity is provided with a pressure stabilizing cavity, and the pressure stabilizing cavity is communicated with the flange. The shell forms a double-layer structure in the middle of the steam inlet area of the screw cavity; according to the utility model, the shell is designed into an oval shape, so that the loading capacity of the shell is increased, and the deformation degree is effectively reduced; the shell is designed into a double-layer structure, so that the stress condition is further optimized, and the problem of leakage of a high-pressure gas source is finally solved; compared with a single-layer shell, the weight of the shell can be reduced, and the cost is saved; and the oval shape is more attractive.

Description

Technical Field

[0001] This utility model relates to the technical field of screw expander housing structure, and in particular to a high-pressure resistant screw expander housing. Background Technology

[0002] A screw expander is a mechanical device that uses the pressure difference between medium- and low-pressure waste heat steam / geothermal energy to drive a pair of male and female screw rotors, converting thermal energy into mechanical energy to generate electricity. Because of the parallel installation of the male and female rotors, the casing of most screw expanders on the market is a figure-eight-shaped tubular shape, and the connecting flanges are oval-shaped like a running track. Furthermore, due to the working principle of the screw expander, its exhaust end is a spiral shape, such as... Figure 2 As shown, the screw expander casing experiences the highest pressure in the steam inlet region (A1 / A2 / B1 / B2), gradually decreasing pressure in the expansion region (C1 / C2), and the lowest pressure in the exhaust region (D1 / D2). Existing oval casings, due to their inherent shape defects, have their internal pressure highest points (A1 / A2 / B1 / B2) also being their weakest points (square structures have poor pressure-bearing capacity), making them incapable of withstanding high pressure. Circular structures, on the other hand, have strong pressure-bearing capacity. To improve the casing's pressure-bearing capacity, straight lines must be minimized and curved shapes increased. However, directly designing the screw expander casing as a circle would significantly increase the equipment's volume, negatively impacting subsequent installation and construction, and greatly increasing manufacturing costs. To address these issues, this invention provides a high-pressure resistant screw expander casing structure. Utility Model Content

[0003] The purpose of this invention is to provide a high-pressure resistant screw expander housing.

[0004] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0005] A high-pressure resistant screw expander housing is provided. The housing is elliptical in shape to increase its pressure-bearing capacity. A flange is provided on one side of the housing. A screw cavity is provided inside the housing. A pressure stabilizing cavity is provided on the outer side of the middle position of the steam inlet area of ​​the screw cavity, so that the housing forms a double-layer structure in the middle position of the steam inlet area of ​​the screw cavity.

[0006] Furthermore, the cross-section of the pressure stabilizing cavity consists of three arc-shaped sides. One of the arc-shaped sides is located on the same ellipse circumference as the sidewall of the exhaust area of ​​the screw cavity, and the circular positions corresponding to the other two arc-shaped sides coincide with the centers of the two holes of the screw cavity. The structural design of the pressure stabilizing cavity can balance the shell.

[0007] Furthermore, the outer circumference of the shell is provided with reinforcing ribs arranged along its axial direction, thereby further increasing the strength of the shell.

[0008] In summary, this utility model has the following beneficial effects: by designing the shell into an elliptical shape, this utility model increases the pressure-bearing capacity of the shell and effectively reduces the degree of deformation; by designing the shell into a double-layer structure, the stress situation is further optimized, ultimately solving the problem of high-pressure gas source leakage; compared with a single-layer shell, this design can also reduce the weight of the shell and save costs; moreover, the elliptical shape is also more aesthetically pleasing. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the screw expander housing structure of this utility model;

[0010] Figure 2 This is a schematic diagram of the casing structure of a screw expander in the prior art.

[0011] In the diagram, 1 is the housing; 2 is the screw chamber; 3 is the flange; 4 is the pressure stabilizing chamber; and 5 is the reinforcing rib. Detailed Implementation

[0012] The present invention will be further described in detail below with reference to the accompanying drawings. The technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0013] like Figure 1 As shown, a high-pressure resistant screw expander housing, the housing 1 is elliptical in shape to increase its pressure-bearing capacity. A flange 3 is provided on one side of the housing 1. A screw cavity 2 is provided inside the housing 1. A pressure-stabilizing chamber 4 is located on the outer side of the middle position of the steam inlet area of ​​the screw cavity 2, forming a double-layer structure in the middle position of the steam inlet area of ​​the screw cavity 2. The double-layer structure is located in the steam inlet area, where the pressures in inlet areas A1, A2, and A3 are the same, and the pressures in B1, B2, and B3 are also the same. This achieves a state of internal and external pressure balance at the point of maximum pressure. Compared to a single-layer housing structure, this double-layer structure design optimizes the stress distribution on the housing.

[0014] Furthermore, the cross-section of the pressure stabilizing cavity 4 is composed of three arc-shaped sides. One of the arc-shaped sides is located on the same ellipse circumference as the side wall of the exhaust area of ​​the screw cavity 2. The circular positions corresponding to the other two arc-shaped sides coincide with the center of the two holes of the screw cavity 2. The structural design of the pressure stabilizing cavity 4 can balance the shell.

[0015] Furthermore, the outer circumference of the shell 1 is provided with reinforcing ribs 5 arranged along its axial direction. By providing reinforcing ribs 5, the strength of the shell 1 is further increased.

[0016] This invention increases the pressure-bearing capacity of the shell by designing it into an elliptical shape, effectively reducing the degree of deformation; the double-layer structure of the shell further optimizes the stress distribution, ultimately solving the problem of high-pressure gas source leakage; compared with a single-layer shell, this design can also reduce the weight of the shell and save costs; moreover, the elliptical shape is more aesthetically pleasing.

[0017] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A high-pressure resistant screw expander housing, characterized in that: The shell (1) is elliptical in shape, and a screw cavity (2) is provided inside the shell (1). A pressure stabilizing cavity (4) is provided on the outer side of the middle position of the steam inlet area of ​​the screw cavity (2), so that the shell (1) forms a double-layer structure in the middle position of the steam inlet area of ​​the screw cavity (2).

2. The high-pressure resistant screw expander housing according to claim 1, characterized in that: The cross-section of the pressure stabilizing cavity (4) consists of three arc-shaped sides. One of the arc-shaped sides is located on the same ellipse circumference as the side wall of the exhaust area of ​​the screw cavity (2). The circular positions corresponding to the other two arc-shaped sides coincide with the center of the two holes of the screw cavity (2).

3. The high-pressure resistant screw expander housing according to claim 2, characterized in that: The outer circumference of the shell (1) is provided with reinforcing ribs (5) arranged along its axial direction.

Images