CN207161146U - A kind of single-screw expander of integrated guiding valve - Google Patents

Abstract

The invention discloses a single-screw expander with an integrated slide valve, which belongs to the technical field of waste heat and pressure energy recovery and utilization. A single-screw expander with an integrated slide valve, including a housing, a main shaft, a single-screw rotor, a star wheel slide valve, etc., and a center-symmetrically arranged suction slide valve adjustment device and an internal volume ratio slide valve adjustment device are arranged on the housing. A corresponding suction chamber is formed between the air slide valve adjusting device, the rotor and the star wheel, and a corresponding exhaust chamber is formed between the internal volume ratio slide valve adjusting device, the rotor and the star wheel. The single-screw expander solves the technical problems of low efficiency and unstable rotational speed of the single-screw expander under variable working conditions.

Description

A single-screw expander with integrated slide valve

technical field

The utility model relates to a single-screw expander with an integrated slide valve, which belongs to the technical field of waste heat and pressure energy utilization.

Background technique

With the increasing energy shortage and environmental pollution, the use of organic Rankine cycle technology to recover waste heat and pressure energy has become the mainstream direction of energy-saving technology. Among them, the expander is one of the core components of the organic Rankine cycle. Among the many expanders, the single-screw expander has a series of advantages such as simple structure, balanced force, low vibration and long life, so it is an organic Rankine cycle. The power output device has a good application prospect.

In the application research of the single-screw expander, the researchers found that there is an optimum rotating speed and optimum expansion ratio of the single-screw expander, that is, the design operating point. If the actual operating condition deviates from the design operating point, the speed of the single-screw expander will decrease or increase, which will lead to serious leakage of the expander, increased frictional heat generation, and under-expansion or over-expansion losses, reducing the single-screw expander. s efficiency. In the actual operation, the change of waste heat power and the change of season will change the operating condition of the organic Rankine cycle system, so that the single-screw expander operates at a deviation from the design operating point. Therefore, it is imperative to carry out high-efficiency operation and constant speed of the single-screw expander under variable working conditions.

When the operating conditions change, the intake volume flow rate and exhaust pressure of the single-screw expander change, resulting in changes in the speed and expansion ratio of the expander, reducing the efficiency of the single-screw expander. In order to adapt to the change of intake volume flow rate and exhaust pressure, this problem can be optimized by changing the volume of the intake unit and the volume of the exhaust unit of the single-screw expander. In the case of a certain single-screw structure size, the volume of the single-screw intake unit and the volume of the exhaust unit are closely related to the intake end angle and exhaust start angle. By adding an axially movable slide valve mechanism and changing the size of the intake end angle and the exhaust start angle, the high-efficiency and constant-speed operation of the single-screw expander under variable working conditions can be ensured. Therefore, it is of great significance to study a single-screw expander with integrated slide valve.

Utility model content

The purpose of this utility model is to design a single-screw expander with an integrated slide valve. By changing the position of the slide valve, the single-screw expander can adapt to changes in external working conditions, so as to realize the high efficiency and high efficiency of the single-screw expander under variable working conditions. Constant speed operation.

In order to achieve the above object, the utility model adopts the following technical solutions:

A single-screw expander with an integrated slide valve, mainly including a shell, a main shaft, a single-screw rotor, and a star wheel; a star wheel is symmetrically arranged on both sides of the single-screw rotor, and the star wheel and the single-screw rotor are located in the shell, and the single-screw rotor The rotor is fixedly connected with the main shaft, and it is characterized in that it also includes two slide valves, each slide valve includes a long cylindrical structure and a short cylindrical structure, and the long cylindrical structure and the short cylindrical structure are arranged coaxially and oppositely arranged between two end faces The gap, in which the end face of the long cylindrical structure is a slope; the long cylindrical structure is close to the single-screw rotor and parallel to the axial direction of the single-screw rotor; Parallel; the positional relationship of the two slide valves is symmetrical to the center of the single-screw rotor; the circumferential structure of the shell is consistent with the overall circumferential structure composed of the star wheel, the single-screw rotor, and the two slide valves, and the long cylindrical structure of the two slide valves In the casing, it forms a sliding connection with the single-screw rotor and the casing, which can slide in the axial direction, and the short cylindrical structure is fixed; a corresponding suction chamber is formed between a slide valve, the single-screw rotor and the casing, and this slide valve is called The suction slide valve adjustment device; the corresponding exhaust cavity is formed between the other slide valve, the single screw rotor and the housing, and this slide valve is called the internal volume ratio slide valve adjustment device.

The long cylindrical structures are respectively attached to a star wheel.

The air inlet of the suction chamber of the single-screw expander is above the shell, and the exhaust port of the exhaust chamber is arranged below the shell.

The single-screw rotor of the single-screw expander is provided with a labyrinth seal and high and low pressure balancing holes.

The single-screw rotor of the single-screw expander is connected to the main shaft as shrink fitting.

The beneficial effects of the utility model are: the axial movement of the slide valve is used to change the volume of the closed element formed between the single-screw rotor, the star wheel and the shell, so that the single-screw expander can adapt to changes in operating conditions , so it can make the single-screw expander run efficiently and at a constant speed under variable working conditions.

Description of drawings

Attached drawing 1, the main cross-sectional view of the single-screw expander with integrated slide valve;

Accompanying drawing 2, the front view of single-screw expander;

Among them, 1 is the shell, 2 is the single-screw rotor, 3 is the main shaft, 4 is the suction volume slide valve device, 5 is the internal volume ratio slide valve device, 6 is the star wheel, 8 is the air inlet, and 9 is the exhaust mouth.

Detailed ways

The technical scheme of the utility model is described in further detail below in conjunction with the accompanying drawings of the description.

A single-screw expander with integrated slide valve is shown in Fig. 1 and Fig. 2, which mainly includes a housing 1, a main shaft 3, a single-screw rotor 2, a star wheel 6, a slide valve (suction volume slide valve device 4, internal volume ratio sliding Valve device 5), air inlet 8, exhaust port 9, etc. The connection between the screw rotor and the main shaft is heat-fitting. A labyrinth sealing groove is opened on the screw rotor to reduce the leakage of working fluid. A balance hole is provided on the screw rotor to maintain high and low pressure balance. The two star wheels are arranged symmetrically on both sides of the screw rotor. The suction volume slide valve and the internal volume ratio slide valve are installed on both sides symmetrically of the center of gravity of the shell. The suction volume slide valve and the content ratio slide valve arranged symmetrically in the center are controlled by synchronous gears, which ensures the consistency of the axial movement of the two slide valves.

The high-temperature and high-pressure organic working gas enters the single-screw expander to drive the screw to rotate and the star wheel to rotate, thereby driving the generator to work. When the waste heat power changes or the season changes, the intake volume flow rate and exhaust pressure of the organic working medium in the single-screw expander change. At this time, the suction volume slide valve and the internal volume ratio slide valve are operated to maintain the single-screw expansion. The machine runs at a constant speed and avoids over-expansion and under-expansion losses.

The applicant has explained and described the embodiments of the present utility model in detail in conjunction with the accompanying drawings, but those skilled in the art should understand that the above embodiments are only preferred implementations of the present utility model, and the detailed description is only to help readers better To understand the spirit of the utility model, but not to limit the protection scope of the utility model, on the contrary, any improvement or modification based on the utility model spirit of the utility model shall fall within the protection scope of the utility model.

Claims (5)

1. A kind of 1. single-screw expander of integrated guiding valve, mainly including housing, main shaft, single-screw rotor, star-wheel；Single-screw rotor Both sides symmetrically respectively arrange a star-wheel, star-wheel, single-screw rotor be located in housing, and single-screw rotor is fixedly connected with main shaft, Characterized in that, also including two guiding valves, each guiding valve includes an oval rod structure and a short cylindrical structure, long cylinder knot Structure and short cylindrical structure have space between coaxial and relative both ends of the surface side by side, wherein the end face of oval rod structure is inclined-plane； Oval rod structure is close to single-screw rotor and axially in parallel with single-screw rotor；The angled end-face of two oval rod structures respectively with The side of the groove of single-screw rotor most end is parallel；The position relationship of two guiding valves is symmetrical with respect to centered on single-screw rotor；Shell Body circumference structure is consistent with the overall circumferential structure of star-wheel, single-screw rotor, two guiding valve compositions, the long cylinder of two guiding valves Structure is respectively formed with single-screw rotor and housing in housing and is slidably connected, and can slide axially, and short cylindrical structure is fixed；One Corresponding suction muffler is formed between guiding valve and single-screw rotor and housing, this guiding valve is referred to as air-breathing guiding valve adjusting means；It is another Individual guiding valve discharge chamber corresponding with being formed between single-screw rotor and housing, this guiding valve are referred to as interior volume specific ratio guiding valve regulation dress Put.
2. 2. according to a kind of single-screw expander of integrated guiding valve described in claim 1, it is characterised in that oval each point of rod structure A star-wheel is not adjacent to.
3. 3. according to a kind of single-screw expander of integrated guiding valve described in claim 1, it is characterised in that single-screw expander is inhaled Above housing, the exhaust outlet of discharge chamber is arranged on below housing the air inlet of air cavity.
4. 4. according to a kind of single-screw expander of integrated guiding valve described in claim 1, it is characterised in that single-screw expander Single-screw rotor is provided with labyrinth seal and high-low pressure balance pipe.
5. 5. according to a kind of single-screw expander of integrated guiding valve described in claim 1, it is characterised in that single-screw expander Single-screw rotor is connected as hot charging with main shaft.