Novel direct-connection expansion power generation equipment

Abstract

The invention relates to power generation equipment, in particular to novel direct-connection expansion power generation equipment. The turbine and the nozzle set are arranged in an inner cavity of the volute, a generator shell is connected with the volute, a generator main shaft extends into the volute to be connected with the turbine, the generator shell is provided with a through hole and a sealing connection guide pipe, sleeve plates are arranged on the two sides of the turbine, and the turbine and the nozzle set are arranged in the through hole. A ring-sleeve-shaped bearing baffle ring is arranged at the position, extending into the volute, of the generator main shaft and penetrates through the grid hole. Under pushing of the power source fluid, a turbine of the novel direct-connection expansion power generation equipment rotates to drive a main shaft of the power generator to rotate, mechanical energy and / or heat energy and the like of the power source fluid are / is converted into electric energy to be output, and meanwhile the low-temperature power source fluid after acting flows and is discharged in the novel direct-connection expansion power generation equipment; and self-cooling of internal components of the novel direct-connection expansion power generation equipment is achieved. Expansion power generation direct connection is adopted, transmission and dynamic and static sealing structures are reduced, the number of used bearings is reduced, zero leakage of working media and self-cooling of power generation parts are achieved, and the system is simple in structure, low in cost, convenient to maintain, high in operation efficiency, low in noise, safe and reliable. The device can be widely applied to waste heat utilization power generation, natural gas differential pressure power generation, steam differential pressure power generation and the like of low-temperature heat sources in all walks of life.

Description

Technical Field

[0001] The invention relates to power generation equipment, in particular to a novel direct expansion power generation equipment. Background Art

[0002] In the field of power generation equipment with heat-to-electricity conversion as its functional goal, the more common design is to adopt a split design of rotary prime movers such as expanders and steam turbines and generators, with a gearbox or coupling as the intermediate transmission component of rotary prime movers such as expanders and steam turbines and generators. This structure has the disadvantages of large mechanical losses, many dynamic and static sealing points, and large leakage of working medium. In working environments with high efficiency requirements, expensive working medium, high output speed of prime movers, or environmental pollution and explosion hazards, this traditional power generation equipment is increasingly showing its limitations. In response to the above problems, some technologies and equipment are currently trying to adopt a direct connection design between prime movers and generators, but due to their technical defects and insufficient understanding, they are unable to truly achieve high efficiency, low cost, zero leakage of working fluids, and self-cooling of internal components. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a new type of direct-connected expansion power generation equipment. This new type of direct-connected expansion power generation equipment adopts direct expansion power generation, reduces the transmission and dynamic and static sealing structures, reduces the number of bearings used, allows the use of low-cost bearings and components, can truly achieve zero leakage of the working medium, self-cooling of power generation components, simple system structure, low cost, easy maintenance, high operating efficiency, low noise, safety and reliability, and can be widely used in waste heat utilization of low-temperature heat sources in various industries for power generation, natural gas pressure difference power generation, steam pressure difference power generation, etc.

[0004] The technical solution adopted by the present invention to solve the technical problem is: A novel direct expansion power generation device, characterized in that it comprises a volute, a turbine, a nozzle assembly, a main shaft sealing system, and a generator;

[0005] A cavity is arranged inside the volute, and a flow medium inlet and a flow medium outlet are arranged at both ends respectively. The flow medium inlet and the flow medium outlet are communicated with the cavity inside the volute, and are used for the flow medium in the novel direct expansion power generation device to enter and exit. The flow medium enters the cavity inside the volute from the flow medium inlet in the radial direction and / or the axial direction of the main shaft of the generator;

[0006] The nozzle group is arranged in the inner cavity of the volute, connected to the volute, and used to adjust the flow rate and flow direction of the flow medium entering the volute;

[0007] The turbine is arranged in the inner cavity of the volute and is circumferentially connected to the main shaft of the generator;

[0008] The generator housing and the volute are connected by, but not limited to, flange connection, welding, threaded connection, key connection, pin connection, folding connection, snap connection, set screw connection, press-fit connection, expansion sleeve connection, bonding connection, and any other permanent, semi-permanent and / or detachable mechanical or chemical fixing means, and the generator main shaft extends from the end of the volute into the internal cavity of the volute;

[0009] The main shaft sealing system is arranged in the inner cavity of the volute, between the turbine and the end of the generator main shaft extending into the volute, and is used to seal the leakage of the flow medium at the end of the volute;

[0010] Optionally, sleeve plates may be provided on both sides of the turbine according to actual needs, and the outer periphery of the sleeve plates is connected to the inner wall of the volute by means including but not limited to flange connection, welding, threaded connection, key connection, pin connection, folding connection, snap connection, set screw connection, press-fit connection, expansion sleeve connection, bonding connection and any other permanent, semi-permanent and / or detachable mechanical or chemical fixing means, so as to adjust the flow rate and flow velocity of the flow medium impacting the turbine;

[0011] Optionally, according to actual needs, a sleeve-shaped bearing retaining ring may be provided at the location where the generator main shaft extends into the internal cavity of the volute, and the sleeve-shaped bearing retaining ring is connected to the generator main shaft by means including but not limited to flange connection, welding, threaded connection, key connection, pin connection, folding connection, snap connection, set screw connection, press-fit connection, expansion sleeve connection, bonding connection, and any other permanent, semi-permanent and / or detachable mechanical or chemical fixing means, so as to reduce the impact of the flow of the flowing medium in the novel direct-connected expansion power generation equipment on the lubrication structure in the generator bearing system;

[0012] Optionally, according to actual needs, the generator housing and / or the volute can be provided with n groups of through grid holes at the location where the generator main shaft extends into the internal cavity of the volute, for releasing the pressure of the flowing medium leaking from the end of the volute, wherein n is an integer greater than or equal to 1;

[0013] Optionally, according to actual needs, the generator housing may be provided with n through holes, each of the through holes is sealed and connected to a conduit by means including but not limited to mechanical compression seals, welding seals, bonding seals, sealing ring seals, gasket seals, thread seals, expansion plug seals and / or any other connection means or methods capable of achieving a sealing effect, and the other end of the conduit is sealed and connected to the flow medium outlet of the volute by means including but not limited to mechanical compression seals, welding seals, bonding seals, sealing ring seals, gasket seals, thread seals, expansion plug seals and / or any other connection means or methods capable of achieving a sealing effect, for guiding the flow medium leaking from the end of the volute and for self-cooling the internal components of the generator, wherein n is an integer greater than or equal to 1;

[0014] The generator bearing system is composed of an axial bearing, a radial bearing and / or a protective bearing that is not in contact with the generator main shaft. The axial bearing, the radial bearing and / or the protective bearing can be a mixed combination of a magnetic bearing, a deep groove ball bearing, an angular contact bearing, a cylindrical roller bearing and / or other types of bearings;

[0015] Optionally according to actual needs, a guide sleeve can be provided on one side of the turbine, and the guide sleeve is connected to the volute by means including but not limited to flange connection, welding, threaded connection, key connection, pin connection, folding connection, snap connection, set screw connection, press-fit connection, expansion sleeve connection, adhesive connection and any other permanent, semi-permanent and / or detachable mechanical or chemical fixing means, and a flow medium channel is formed between the guide sleeve and the volute along the main shaft of the generator, axially expanding from the turbine to the flow medium outlet.

[0016] Compared with the prior art, the present invention using the above technical solution has the following beneficial effects: (1) The novel direct-connected expansion power generation equipment of the present invention adopts direct connection of expansion power generation and rationally plans the flow path of the working medium, thus truly achieving zero leakage of the working medium; (2) The novel direct expansion power generation equipment of the present invention reduces the number of transmissions and bearings used, greatly reduces mechanical friction losses, and reduces the workload of system equipment maintenance; (3) The novel direct expansion power generation equipment of the present invention reduces the dynamic and static sealing structures, sets bearing retaining rings, allows the use of low-cost bearings and components, and achieves low cost and high efficiency of the equipment; (4) The novel direct expansion power generation equipment of the present invention is compatible with radial and axial fluid power sources, has a simple system structure, is safe and reliable, and can be widely used in various industries for waste heat utilization of low-temperature heat sources for power generation, natural gas pressure difference power generation, steam pressure difference power generation, etc., and has broad market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of an embodiment of the present invention; In the figure: flow medium inlet 1; flow medium outlet 2; turbine 3; annular bearing retaining ring 4; generator 5; duct 6; guide sleeve 7; sleeve plate 8; nozzle group 9; main shaft sealing system 10. DETAILED DESCRIPTION

[0018] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0019] See also Figure 1 , a novel direct expansion power generation equipment, characterized in that it includes a volute, a turbine, a nozzle group, a main shaft sealing system, and a generator;

[0020] A cavity is arranged inside the volute, and a flow medium inlet and a flow medium outlet are arranged at both ends respectively. The flow medium inlet and the flow medium outlet are communicated with the cavity inside the volute, and are used for the flow medium in the novel direct expansion power generation device to enter and exit. The flow medium enters the cavity inside the volute from the flow medium inlet in a radial direction along the main shaft of the generator;

[0021] The nozzle group is arranged in the inner cavity of the volute, connected to the volute, and used to adjust the flow rate and flow direction of the flow medium entering the volute;

[0022] The turbine is arranged in the inner cavity of the volute and is circumferentially connected to the main shaft of the generator;

[0023] The generator housing is connected to the volute through a flange, and the generator main shaft extends from the end of the volute into the inner cavity of the volute;

[0024] The main shaft sealing system is arranged in the inner cavity of the volute, between the turbine and the end of the generator main shaft extending into the volute, and is used to seal the leakage of the flow medium at the end of the volute;

[0025] Sleeve plates are arranged on both sides of the turbine, and the outer periphery of the sleeve plates is fixedly connected to the inner wall of the volute, so as to adjust the flow rate and flow velocity of the flow medium impacting the turbine;

[0026] An annular bearing retaining ring is arranged where the generator main shaft extends into the internal cavity of the volute, and the annular bearing retaining ring is fixedly connected to the generator main shaft to reduce the impact of the flow of the flowing medium in the novel direct-connected expansion power generation equipment on the lubrication structure in the generator bearing system;

[0027] The generator housing and the volute are provided with a set of through grid holes where the generator main shaft extends into the internal cavity of the volute, for releasing the pressure of the flowing medium leaking from the end of the volute;

[0028] The generator housing is provided with a through hole, the through hole is sealed with a conduit, the other end of the conduit is sealed with a flow medium outlet of the volute, and is used for guiding the flow medium leaking from the end of the volute and for self-cooling the internal components of the generator;

[0029] The generator bearing system is composed of an axial bearing and a radial bearing, and the axial bearing and the radial bearing are angular contact bearings;

[0030] A flow guide sleeve is arranged on one side of the turbine, and the flow guide sleeve is fixedly connected to the volute, and a flow medium channel is formed between the flow guide sleeve and the volute along the main shaft of the generator, axially expanding from the turbine to the flow medium outlet direction.

[0031] The working process of this embodiment is: the working medium steam enters the internal cavity of the volute from the flowing medium inlet along the radial direction of the generator main shaft, drives the turbine circumferentially connected to the generator main shaft to rotate, and drives the generator main shaft to rotate at a high speed. The internal winding stator of the generator cooperates with the rotor, and the high-speed rotation of the rotor is used to cut the magnetic lines to generate electrical energy, and the electrical energy is output to the external power system through the lead of the generator to drag the load. The exhaust steam of the working medium after expansion and work flows into the inside of the generator from the through-grid hole, etc., and then flows to the flowing medium outlet through the through hole and the conduit, absorbs and cools the heat generated by the internal components of the generator, and finally the exhaust steam is discharged through the flowing medium outlet to directly connect to the expansion power generation equipment.

[0032] The above description is only a preferred feasible embodiment of the present invention, and does not limit the scope of protection of the present invention. For ordinary technicians in this technical field, several improvements can be made without departing from the principle of the present invention. These improvements should also be regarded as the scope of protection of the present invention. It should be pointed out that all equivalent structural changes made using the contents of the present invention specification and drawings are included in the scope of protection of the present invention.

Claims

1. A new type of direct expansion power generation equipment, characterized by: Including volute, turbine, nozzle assembly, main shaft sealing system, generator; A cavity is arranged inside the volute, and a flow medium inlet and a flow medium outlet are arranged at both ends respectively. The flow medium inlet and the flow medium outlet are communicated with the cavity inside the volute, and are used for the flow medium in the novel direct expansion power generation device to enter and exit. The flow medium enters the cavity inside the volute from the flow medium inlet in the radial direction and / or the axial direction of the main shaft of the generator; The nozzle group is arranged in the inner cavity of the volute, connected to the volute, and used to adjust the flow rate and flow direction of the flow medium entering the volute; The turbine is arranged in the inner cavity of the volute and is circumferentially connected to the main shaft of the generator; The generator housing and the volute are connected by, but not limited to, flange connection, welding, threaded connection, key connection, pin connection, folding connection, snap connection, set screw connection, press-fit connection, expansion sleeve connection, bonding connection, and any other permanent, semi-permanent and / or detachable mechanical or chemical fixing means, and the generator main shaft extends from the end of the volute into the internal cavity of the volute; The main shaft sealing system is arranged in the inner cavity of the volute, between the turbine and the end of the generator main shaft extending into the volute, and is used for sealing the leakage of the flow medium at the end of the volute.

2. A novel direct expansion power generation device according to claim 1, characterized in that : Optionally, sleeve plates can be set on both sides of the turbine according to actual needs, and the outer periphery of the sleeve plates is connected to the inner wall of the volute by means including but not limited to flange connection, welding, threaded connection, key connection, pin connection, folding connection, snap connection, set screw connection, press-fit connection, expansion sleeve connection, adhesive connection and any other permanent, semi-permanent and / or detachable mechanical or chemical fixing means, so as to adjust the flow rate and flow velocity of the flow medium impacting the turbine.

3. A novel direct expansion power generation device according to claim 1, characterized in that : Optionally according to actual needs, an annular bearing retaining ring can be provided at the place where the generator main shaft extends into the internal cavity of the volute, and the annular bearing retaining ring is connected to the generator main shaft by means including but not limited to flange connection, welding, threaded connection, key connection, pin connection, folding connection, snap connection, set screw connection, press-fit connection, expansion sleeve connection, adhesive connection and any other permanent, semi-permanent and / or detachable mechanical or chemical fixing means, so as to reduce the impact of the flow of the flowing medium in the novel direct-connected expansion power generation equipment on the lubrication structure in the generator bearing system.

4. A novel direct expansion power generation device according to claim 1, characterized in that : Optionally according to actual needs, the generator casing and / or the volute casing can be provided with n groups of through grid holes where the generator main shaft extends into the internal cavity of the volute casing, for releasing the pressure of the flowing medium leaking from the end of the volute casing, wherein n is an integer greater than or equal to 1.

5. A novel direct expansion power generation device according to claim 1, characterized in that : Optionally, according to actual needs, the generator casing can be provided with n through holes, each of the through holes is sealed and connected to a conduit by means of, but not limited to, mechanical compression seals, welding seals, adhesive seals, sealing ring seals, gasket seals, threaded seals, expansion plug seals and / or any other connection means or methods capable of achieving a sealing effect, and the other end of the conduit is sealed and connected to the flow medium outlet of the volute by means of, but not limited to, mechanical compression seals, welding seals, adhesive seals, sealing ring seals, gasket seals, threaded seals, expansion plug seals and / or any other connection means or methods capable of achieving a sealing effect, for guiding the flow medium leaking from the end of the volute and for self-cooling of the internal components of the generator, and n is an integer greater than or equal to 1.

6. A novel direct expansion power generation device according to claim 1, characterized in that :The generator bearing system is composed of axial bearings, radial bearings and / or protective bearings that are not in contact with the generator main shaft. The axial bearings, radial bearings and / or protective bearings can be a mixed combination of magnetic bearings, deep groove ball bearings, angular contact bearings, cylindrical roller bearings and / or other types of bearings.

7. A novel direct expansion power generation device according to claim 1, characterized in that : Optionally, according to actual needs, a guide sleeve can be set on one side of the turbine, and the guide sleeve is connected to the volute by means including but not limited to flange connection, welding, threaded connection, key connection, pin connection, folding connection, snap connection, set screw connection, press-fit connection, expansion sleeve connection, adhesive connection and any other permanent, semi-permanent and / or detachable mechanical or chemical fixing means, and a flow medium channel is formed between the guide sleeve and the volute along the main shaft of the generator, axially expanding from the turbine to the flow medium outlet.

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