Differential pressure power generation equipment

Abstract

The differential pressure power generation equipment comprises an air inlet connecting piece, a turbine shell and a pipeline sleeve, and the turbine shell is fixedly installed at the front end of the pipeline sleeve; a main shaft is arranged in the pipeline sleeve, a movable impeller and a generator are installed on the main shaft from front to back, the rear end of the turbine shell is fixedly connected with a generator shell, a generator stator and a generator rotor are arranged in the generator shell, the generator rotor is fixedly installed on the main shaft, and the generator stator is arranged on the periphery of the generator rotor in a sleeving mode. A ball bearing is arranged between the generator shell and the main shaft; a gap is reserved between the pipeline sleeve and the generator shell for natural gas to pass through; the movable impeller is fixed to the main shaft, and the static impeller is arranged on the periphery of the movable impeller and fixedly installed on the turbine shell. The device is small in size, simple in system, high in reliability, low in radial force and high in safety, and the system can be cooled by means of cold energy generated after natural gas expands to do work.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of natural gas power generation, in particular to a differential pressure power generation equipment. BACKGROUND

[0002] Natural gas pressure energy, as a rich and sustainable energy, is often utilized by high-power equipment such as double-screw expanders when processed in large stations. However, such equipment has many challenges: high equipment complexity leads to high initial investment costs; due to the need for a complex sealing system, sealing is difficult and may lead to natural gas leakage, posing a safety hazard; frequent maintenance requirements increase operating costs; and the bulky equipment limits installation flexibility and may not be suitable for various site conditions.

[0003] Patent No. 202321124324.7 provides an innovative coaxial turbine and generator unit aimed at improving power generation efficiency and simplifying the system: including a coaxially arranged turbine device and a high-speed permanent magnet synchronous generator and an exhaust pipe, the turbine device is coaxially arranged with the high-speed permanent magnet synchronous generator, the turbine device is in communication with the high-speed permanent magnet synchronous generator, and the high-speed permanent magnet synchronous generator is in communication with the exhaust pipe. However, the use of magnetic suspension bearings in this patent solution can reduce mechanical wear, but requires external power supply, which to some extent increases the complexity of the system. In addition, although the volute design helps gas flow, the radial force generated may challenge the long-term stability and lifespan of the unit.

[0004] Patent No. 202311326760.7 discloses an air-suspended differential pressure expansion power generation device, which includes a motor stator, a motor rotor installed in the middle of the motor stator, a machine shell insert sleeve fixedly installed on the outside of the motor stator, a machine shell fixedly installed on the outside of the machine shell insert sleeve, an air inlet pipe fixedly installed at one end of the machine shell, an air outlet pipe fixedly installed at the other end of the machine shell, and an air passage left between the machine shell and the machine shell insert sleeve; a first radial bearing is installed at one end of the motor rotor close to the air inlet pipe, a bearing assembly is installed at the other end of the motor rotor, and an expansion wheel is fixedly installed at one end of the motor rotor close to the air outlet pipe. The differential pressure power generation device can fully utilize the wasted pressure difference energy during natural gas transportation, does not consume natural gas during power generation, does not emit wastewater, exhaust gas, and solid waste during production and operation, and does not affect the environment, creating a clean and efficient distributed energy. However, since the expansion wheel is downstream of the motor, its cooling is achieved by passing part of the natural gas between the motor rotor and the motor stator to remove the heat of the motor, but since the temperature of the natural gas before work is not very low, the cooling effect will be affected to some extent, and direct contact with the live parts will also have some impact on safety. UTILITY MODEL CONTENTS

[0005] To this end, the application provides a differential pressure power generation device to solve the problems of large volume, external power supply for bearings, large radial force, poor cooling effect and low safety in the prior art.

[0006] In order to achieve the above object, the application provides the following technical scheme:

[0007] A differential pressure power generation device, comprising an air inlet connecting piece, a turbine shell and a pipeline sleeve, the turbine shell is fixedly installed at the front end of the pipeline sleeve, the air inlet connecting piece is fixedly installed at the front end of the turbine shell, the front end of the air inlet connecting piece is an air inlet, and the rear end of the pipeline sleeve is an air outlet;

[0008] A main shaft is arranged in the pipeline sleeve, a moving vane wheel and a generator are installed on the main shaft from front to back, the rear end of the turbine shell is fixedly connected with a generator shell, the inside of the generator shell is provided with a generator stator and a generator rotor, the generator rotor is fixedly installed on the main shaft, and the generator stator is sleeved on the outer periphery of the generator rotor; and a ball bearing is arranged between the generator shell and the main shaft.

[0009] A gap is left between the pipeline sleeve and the generator shell for natural gas to pass through.

[0010] The moving vane wheel is fixed on the main shaft, and the outer periphery of the moving vane wheel is provided with a stationary vane wheel, and the stationary vane wheel is fixedly installed on the turbine shell.

[0011] Optionally, the rear end of the generator shell is fixedly connected with a thrust bearing seat, and a rolling bearing is arranged between the center of the thrust bearing seat and the main shaft.

[0012] Optionally, the outer wall of the turbine shell is flush with the front end outer wall of the pipeline sleeve, and a flange sleeve for fixing the turbine shell and the pipeline sleeve is arranged on the outer sides of the turbine shell and the pipeline sleeve.

[0013] Optionally, the air inlet connecting piece, the turbine shell, the moving vane wheel, the stationary vane wheel, the pipeline sleeve, the generator rotor, the generator stator and the generator shell are coaxially arranged with the main shaft and are distributed in a central symmetric form with the axis of the main shaft as the axis.

[0014] Optionally, the inside of the air inlet connecting piece is provided with a fairing for guiding the natural gas, and the rear end of the fairing is fixedly connected with the front end of the stationary vane wheel.

[0015] Optionally, a plurality of guide vanes are arranged on the stationary vane wheel, the guide vanes are uniformly arranged on the stationary vane wheel in a central symmetric form with the axis of the stationary vane wheel as the axis, each guide vane is arranged obliquely and has an included angle with the radial direction of the stationary vane wheel.

[0016] Optionally, the rear end of the pipe sleeve is in a conical structure with gradually decreasing radius.

[0017] Optionally, the generator stator is connected with winding outgoing lines, and the turbine housing and the air inlet connecting piece are both provided with threading holes for the winding outgoing lines to pass through.

[0018] Optionally, the generator driver is further included, and the generator driver is used to drive the generator to drive the impeller to rotate when the device is started.

[0019] Compared with the prior art, the present application has at least the following beneficial effects:

[0020] 1. The present application realizes small natural gas differential pressure power generation, has small overall volume, low maintenance cost, and can be continuously and stably operated for a long time. Rolling bearings are applied, external power supply is not required, the system is simple, the cost is lower, the reliability is higher, and the system can be operated for a long time under high-speed working conditions.

[0021] Moreover, the motor is arranged downstream of the turbine housing, the low temperature after the natural gas expansion is utilized to solve the problem of cold energy release, the heat generated by the motor is neutralized, the cooling effect is good, and the safety is higher because the natural gas does not directly contact the electric component.

[0022] 2. The components are arranged in a central symmetrical structure, the effects of low axial force and low radial force are realized, the axial load and the radial load are controlled to be within the fatigue load of the bearing, and long service life operation is realized.

[0023] 3. The turbine and the generator are both arranged in the pipe sleeve, the dynamic seal is changed into static seal to cope with the dangerous scene that the natural gas is easy to leak.

[0024] 4. The pipe type design has high integration degree, is convenient to disassemble and assemble on site, and is convenient to maintain. The device can be opened by only opening the flange sleeve, and disassembly and assembly are realized. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more directly illustrate the prior art and the present application, the following exemplary drawings are given. It should be understood that the specific shapes, structures, and the like shown in the drawings should not be regarded as limiting conditions for realizing the present application; for example, based on the technical concept disclosed in the present application and the exemplary drawings, those skilled in the art can easily make routine adjustments or further optimization on the increase / decrease / attribute division of certain units (components), the specific shape, the positional relationship, the connection mode, the size ratio relationship, and the like.

[0026] Figure 1 A structure schematic view of a differential pressure power generation device provided for an embodiment of the present application is shown in the figure;

[0027] Figure 2 A sectional view of a differential pressure power generation device provided for an embodiment of the present application is shown in the figure;

[0028] Figure 3 For Figure 2 enlarged view of A in FIG. 1;

[0029] Figure 4 For Figure 1 sectional view of A-A in FIG. 1;

[0030] Figure 5 Another perspective sectional view of the pressure differential power generation device according to an embodiment of the present application.

[0031] BRIEF DESCRIPTION OF DRAWINGS

[0032] 1, intake connection; 2, turbine housing; 3, pipe sleeve; 4, flange sleeve; 5, circular table; 6, main shaft; 7, moving vane; 8, static vane; 9, generator housing; 10, generator stator; 11, generator rotor; 12, ball bearing; 13, bearing cover; 14, thrust bearing seat; 15, guide vane; 16, fairing; 17, winding lead. DETAILED DESCRIPTION

[0033] The present application will be further described in conjunction with the accompanying drawings and specific embodiments.

[0034] In the description of the present application: unless otherwise specified, the meaning of "a plurality of" is two or more. The expressions such as "including", "containing", "having", etc. also mean "not limited to" (certain units, components, materials, steps, etc.).

[0035] The terms such as "upper", "lower", "left", "right", "intermediate", etc. cited in the present application are generally made for the purpose of intuitive understanding by referring to the relative positional relationship in the drawings, and are not an absolute limitation on the positional relationship in the actual product.

[0036] A pressure differential power generation device, with reference to Figures 1-5 , comprising an intake connection 1, a turbine housing 2 and a pipe sleeve 3, the turbine housing 2 is fixedly installed at the front end of the pipe sleeve 3, and the intake connection 1 is fixedly installed at the front end of the turbine housing 2. Among them, the outer wall of the turbine housing 2 is flush with the outer wall of the pipe sleeve 3, and the outer periphery of the two is fixed by a flange sleeve 4.

[0037] Specifically, the rear end of the intake connection 1 gradually increases in radius, and the rear end is provided with a circular table 5 which is clamped with the turbine housing 2, and the circular table 5 is fixed with the front end of the turbine housing 2 through a plurality of bolts. The front end of the intake connection 1 is a circular tube structure, which is set as an air inlet, and the rear end of the pipe sleeve 3 is a tapered structure with gradually decreasing radius, which is an air outlet.

[0038] A main shaft 6 is arranged in the pipeline sleeve 3, and the dynamic blade wheel 7 and the generator are arranged on the main shaft 6 from front to back.

[0039] The rear end of the turbine shell 2 is fixedly connected with the front end of the generator shell 9. The generator shell 9 is internally provided with a generator stator 10 and a generator rotor 11, the generator rotor 11 is fixedly arranged on the main shaft 6, and the generator stator 10 is sleeved on the outer periphery of the generator rotor 11, wherein the generator rotor 11 and the generator stator 10 are in contact, and the generator stator 10 and the generator shell 9 are also in contact without leaving a gap.

[0040] In the embodiment of the application, the front end of the generator shell 9 is close to the main shaft 6, and the ball bearing 12 is arranged between the front end of the generator shell 9 and the main shaft 6. The upper end of the ball bearing 12 is provided with a bearing cover 13, and the bearing cover 13 is arranged between the main shaft 6 and the generator shell 9. The rear end of the generator shell 9 is open, and a thrust bearing seat 14 is fixedly arranged at the rear end. The ball bearing 12 is arranged between the center of the thrust bearing seat 14 and the main shaft 6, and the rear end of the ball bearing 12 is provided with the bearing cover 13.

[0041] Since the starting torque of the rolling bearing is large, when there is a pressure difference between the front and the rear in the shutdown state, the speed triangle is not formed, and the generated torque is very small, which cannot start the whole system. Therefore, the generator driver is also arranged in the device, so that the generator is used as a motor in the starting stage to make the dynamic blade wheel 7 rotate, and then used as a generator.

[0042] The pipeline sleeve 3 and the generator shell 9 are left with a gap for the natural gas to pass through.

[0043] It should be noted that the gas inlet connecting piece 1, the turbine shell 2, the dynamic blade wheel 7, the static blade wheel 8, the pipeline sleeve 3, the generator rotor 11, the generator stator 10 and the generator shell 9 in the application are coaxially arranged with the main shaft 6 and are centrally symmetrically distributed with the axis of the main shaft 6 as the axis, so as to reduce the radial force of the system and enable long-term operation under high-speed working conditions.

[0044] Further, a plurality of guide vanes 15 are arranged on the static blade wheel 8, and the guide vanes 15 are uniformly arranged on the static blade wheel 8 in a central symmetric manner with the axis of the static blade wheel 8 as the axis. Each guide vane 15 is an arc-shaped and inclined arrangement protruding outward of the static blade wheel 8, and has an included angle with the radial direction of the static blade wheel 8. The distance from the axis of the static blade wheel 8 to the guide vane 15 gradually increases from one end to the other end. Through the arrangement, the natural gas flows to the dynamic blade wheel 7 under the guidance of the gap between the adjacent two guide vanes 15, so as to drive the dynamic blade wheel 7 to rotate and realize power generation.

[0045] In order to guide the natural gas, the inside of the air inlet connector 1 is provided with a fairing 16. The fairing 16 is a conical structure with a gradually increasing radius from front to back, the inclination of the side wall is consistent with the inclination of the side wall of the rear end of the air inlet connector 1, and a gap is left between the two for the natural gas to pass through. The rear end of the fairing 16 is flush with the front end of the stator wheel 8 in the axial direction and is fixedly connected. Under the guidance of the fairing 16, the natural gas entering the device will be guided to the outer periphery of the stator wheel 8 along the gap between the fairing 16 and the air inlet connector 1, and then flow to the rotor wheel 7 through the guide vane 15, driving the rotor wheel 7 to rotate. Then pass through the gap at the rear end of the turbine housing 2, enter the gap between the generator housing 9 and the pipe sleeve 3, and finally flow out from the gas outlet at the rear end of the pipe sleeve 3.

[0046] When the natural gas passes through the turbine and expands to do work, it will be cooled, and then when it passes through the generator housing 9, it will cool the generator, avoiding overheating of the device.

[0047] The generator stator 10 is connected with a winding lead-out wire 17, and the turbine housing 2 and the air inlet connector 1 are both provided with a wire hole for the winding lead-out wire 17 to pass through.

[0048] The implementation principle of the embodiment of the application is that the natural gas enters the device from the air inlet connector 1 and flows to the stator wheel 8 from the gap between the fairing 16 and the air inlet connector 1. Then under the guidance of the guide vane 15, it flows to the rotor wheel 7 and drives it to rotate to generate electricity. Then the natural gas continues to flow to the rear end of the device, passes through the hole in the turbine housing 2, and flows into the gap between the generator housing 9 and the pipe sleeve 3 (i.e. the gas passage), and continues to flow to the rear end of the device. In this process, since the temperature of the natural gas is reduced after expanding to do work in the turbine, the generator can be cooled when flowing through the generator housing 9.

[0049] The natural gas continues to flow and finally flows out from the rear end outlet of the pipe sleeve 3, completing the work.

[0050] The technical features of the above embodiments can be combined in any way (as long as the combination of the technical features does not exist contradictions), in order to make the description simple, not all possible combinations of the technical features in the above embodiments are described; these embodiments which are not explicitly written should also be considered as the scope of the present application.

Claims

1. A pressure differential power generation apparatus, characterized by: It comprises an air inlet connector (1), a turbine shell (2) and a pipeline sleeve (3), the turbine shell (2) is fixedly installed at the front end of the pipeline sleeve (3), the air inlet connector (1) is fixedly installed at the front end of the turbine shell (2), the front end of the air inlet connector (1) is an air inlet, and the rear end of the pipeline sleeve (3) is an air outlet. A main shaft (6) is arranged in the pipeline sleeve (3), the dynamic blade wheel (7) and the generator are installed on the main shaft (6) from front to back, the rear end of the turbine shell (2) is fixedly connected with the generator shell, the inside of the generator shell (9) is provided with the generator stator (10) and the generator rotor (11), the generator rotor (11) is fixedly installed on the main shaft (6), and the generator stator (10) is sleeved on the outer periphery of the generator rotor (11); the ball bearing (12) is arranged between the generator shell (9) and the main shaft (6). A gap is left between the pipeline sleeve (3) and the generator shell (9) for the natural gas to pass through. The dynamic blade wheel (7) is fixed on the main shaft (6), the outer periphery of the dynamic blade wheel (7) is provided with the static blade wheel (8), and the static blade wheel (8) is fixedly installed on the turbine shell (2).

2. The differential pressure power generation apparatus according to claim 1, characterized by: The rear end of the generator shell (9) is fixedly connected with the thrust bearing seat (14), and the rolling bearing is arranged between the center of the thrust bearing seat (14) and the main shaft (6).

3. The differential pressure power generation apparatus according to claim 1, characterized by: The outer wall of the turbine shell (2) is flush with the front end outer wall of the pipeline sleeve (3), and the turbine shell (2) and the pipeline sleeve (3) are sleeved with the flange sleeve (4) for fixing.

4. The differential pressure power generation apparatus according to claim 1, characterized by: The air inlet connector (1), the turbine shell (2), the dynamic blade wheel (7), the static blade wheel (8), the pipeline sleeve (3), the generator rotor (11), the generator stator (10) and the generator shell (9) are coaxially arranged with the main shaft (6) and are centrally symmetrically distributed with the axis of the main shaft (6) as the axis.

5. The differential pressure power generation apparatus of claim 1, wherein: The inside of the air inlet connector (1) is provided with the fairing (16) for guiding the natural gas, and the rear end of the fairing (16) is fixedly connected with the front end of the static blade wheel (8).

6. The differential pressure power generation apparatus of claim 1, wherein: The static blade wheel (8) is provided with a plurality of guide vanes (15), the guide vanes (15) are uniformly arranged on the static blade wheel (8) in a central symmetric form with the axis of the static blade wheel (8) as the axis; each guide vane (15) is arranged obliquely and has an included angle with the radial direction of the static blade wheel (8).

7. The differential pressure power generation apparatus of claim 1, wherein: The rear end of the pipeline sleeve (3) is in a tapered structure with gradually decreasing radius.

8. The differential pressure power generation apparatus of claim 1, wherein: The generator stator (10) is connected with the winding lead-out wire (17), and the turbine shell (2) and the air inlet connector (1) are both provided with wire holes for the winding lead-out wire (17) to pass through.

9. The differential pressure power generation apparatus of claim 1, wherein: It also comprises a generator driver, which is used for driving the generator to drive the dynamic blade wheel (7) to rotate when the equipment starts.

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