CN210768927U

CN210768927U - Semi-closed ORC screw expander with shaft seal structure

Info

Publication number: CN210768927U
Application number: CN201921807878.0U
Authority: CN
Inventors: 朱振中; 陈锐; 胡建军; 张开闯
Original assignee: Wuxi Xiya Compressor Co ltd
Current assignee: Wuxi Xiya Compressor Co ltd
Priority date: 2019-10-25
Filing date: 2019-10-25
Publication date: 2020-06-16
Anticipated expiration: 2029-10-25

Abstract

The utility model relates to the technical field of expanders, in particular to a semi-closed ORC screw expander with a shaft seal structure, which can obviously reduce the oil injection amount of a system and the circulation amount of lubricating oil and improve the heat exchange efficiency of the system, comprises a screw rotor shell and a generator shell which are mutually connected, the screw rotor shell is provided with an expansion working medium inlet and an expansion working medium outlet, a male screw rotor and a female screw rotor which are matched are arranged in the screw rotor shell, a generator stator and a generator rotor are arranged in the generator shell, the male screw rotor and the generator rotor are coaxially arranged, the synchronous gear box is characterized in that a first rotating shaft on two sides of the male screw rotor and a second rotating shaft on two sides of the female screw rotor are respectively connected with a bearing and a shaft seal, and the first rotating shaft and the second rotating shaft on the same side are respectively sleeved with synchronous gears which are meshed with each other.

Description

Semi-closed ORC screw expander with shaft seal structure

Technical Field

The utility model relates to an expander technical field, concretely relates to semi-closed ORC screw rod expander with shaft seal structure.

Background

ORC is an abbreviation of Organic Rankine Cycle, generally called Organic Rankine Cycle, and the circulating system mainly comprises an expander, a condenser, a working medium pump, a preheater, an evaporator and a superheater, is widely applied to the field of heat energy recovery, such as occasions of residual heat and residual pressure, geothermal energy, biomass energy, solar energy and the like, and has wide market application prospect. In an ORC system adopting a screw expander, high-temperature and high-pressure working media can directly output mechanical energy or drive a generator to indirectly convert the mechanical energy into electric energy by driving a screw rotor in the screw expander to do work through rotation. The screw rod expander that drive generator electricity generation mainly has two kinds of types of open-type and semi-enclosed, and to open-type structure, the screw rod expander need design has mechanical seal to link to each other with the help of shaft coupling and generator, and semi-enclosed structure adopts generator and screw rod expander integrated form structure, and the advantage is showing, embodies: the coaxial design of the rotor shaft and the screw rotor of the generator is adopted, a coupler connected with the expander and the motor is eliminated, so that the expansion machine has the characteristics of more compact structure, higher transmission efficiency and no need of centering, and meanwhile, a mechanical sealing structure of an open type expander is eliminated, so that a channel for leakage of working media is reduced, the operation cycle of the expansion machine is prolonged, and the maintenance cost is reduced.

Semi-closed screw expander often adopts the mutual contact driven mode of negative and positive rotor, and this kind of mode need carry out the oil spout to the rotor and produce lubrication and sealed, alleviates the noise that rotor direct contact drive produced, vibration and wearing and tearing, but this has also brought new problem simultaneously: a complex oil-gas separation system must be configured, oil enters an evaporator and a condenser along with a gaseous working medium to influence heat exchange efficiency, the oil injection amount of the system is large, and the like.

Disclosure of Invention

In order to solve present must dispose complicated oil-gas separation system, oil gets into evaporimeter and condenser along with gaseous state working medium and influences heat exchange efficiency, the big scheduling problem of system oiling volume, the utility model provides a semi-closed ORC screw expander with shaft seal structure, its circulation volume that can show reduction system oiling volume and lubricating oil improves system heat exchange efficiency.

The technical scheme is as follows: the utility model provides a semi-closed ORC screw expander with shaft seal structure, its includes interconnect's screw rotor casing and generator casing, be provided with inflation working medium entry and inflation working medium export on the screw rotor casing, install complex positive screw rotor and negative screw rotor in the screw rotor casing, install generator stator and generator rotor in the generator casing, positive screw rotor with generator rotor coaxial arrangement, its characterized in that, the first pivot of positive screw rotor both sides and the second pivot of negative screw rotor both sides are connected bearing and bearing seal respectively, with one side first pivot with overlap respectively in the second pivot and be equipped with intermeshing's synchromesh gear.

The self-lubricating wear-resistant heat-resistant screw rod rotor is further characterized in that self-lubricating wear-resistant heat-resistant coatings are arranged on the surfaces of the male screw rod rotor and the female screw rod rotor;

the shaft seal comprises three sealing rings which are arranged side by side, two adjacent groups of sealing rings are separated by a space ring, and a wave spring is arranged in each sealing ring;

the shaft seals on the first rotating shaft and the second rotating shaft on the same side are communicated with each other, and the shaft seals at two ends of the female screw rotor or the male screw rotor are connected through a balance pipe;

a cooling oil inlet and a cooling oil outlet are formed in the generator shell;

and a speed measuring sensor corresponding to the first rotating shaft is arranged on the generator shell or the screw rotor shell.

Adopt the utility model discloses afterwards, through setting up synchronous gear, the contact between the screw rotor has been avoided, can cancel the oil spout between the rotor, lubricating oil only is used for guaranteeing the bearing, the normal work of synchronous gear and motor, adopt bearing seal structure furthest to keep apart lubricating oil and inflation working medium, reduce lubricating oil and follow the flow that working medium got into circulation system, thereby reduced lubricating oil and to the influence of ORC circulation system, oil gas branch system has been simplified, simultaneously because the oil spout does not need between the rotor, the circulation volume of lubricating oil has been reduced, therefore lubricating oil pouring volume obtains reducing by a wide margin.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic structural view of a second embodiment of the present invention;

FIG. 3 is a schematic view of a shaft seal.

Detailed Description

Referring to fig. 1 and fig. 3, in the first embodiment: a semi-closed ORC screw expander with a shaft seal structure comprises a screw rotor shell 1 and a generator shell 2 which are connected with each other, an expansion working medium inlet 3 and an expansion working medium outlet 4 are arranged on the screw rotor shell 1, a male screw rotor 5 and a female screw rotor 6 which are matched with each other are arranged in the screw rotor shell 1, a generator stator 7 and a generator rotor 8 are arranged in the generator shell 2, the male screw rotor 5 and the generator rotor 8 are coaxially arranged, that is, a shaft is shared, the first rotating shaft 10 at both sides of the male screw rotor 5 and the second rotating shaft 9 at both sides of the female screw rotor 6 are respectively connected with the bearing 11 and the shaft seal 12, the first rotating shaft 9 and the second rotating shaft 10 at the same side are respectively sleeved with the synchronizing gear 13 which is engaged with each other, the synchronizing gear 13 is arranged in the gear box 14, and the gear box 14 in this embodiment is located between the generator housing 2 and the screw rotor housing 1. The surfaces of the male screw rotor 5 and the female screw rotor 6 are coated with self-lubricating wear-resistant heat-resistant coatings, so that the meshing clearance of the rotors is controlled to the maximum extent, and the influence of leakage generated by the working medium in the expansion process on the expansion efficiency is weakened.

The shaft seal 12 comprises three groups of sealing rings 12-1 which are arranged side by side, two adjacent groups of sealing rings 12-1 are separated by a spacer ring 12-3, and a wave spring 12-2 is arranged in each sealing ring 12-1; the first rotating shaft 10 and the shaft seal 12 on the second rotating shaft 9 on the same side are communicated with each other, the shaft seals 12 at two ends of the female screw rotor 6 are connected through a balance pipe 15, and the shaft seals 12 are connected through the balance pipe 15 to balance the pressure in the bearing cavities at two sides, which is beneficial to the design of oil supply pressure; in addition, a small annular gap is formed between the sealing ring 12-1 contained in the shaft seal 12 and the first rotating shaft 9 and the second rotating shaft 10 to form throttling, so that the pressure of an expansion working medium can be reduced to a great extent, the influence of leakage of the expansion working medium on the expansion efficiency is reduced, and meanwhile, the influence of lubricating oil mixed into the working medium entering a system through the expansion working medium outlet 12 to the heat exchange efficiency of a system heat exchanger is reduced. The generator housing 2 is provided with a cooling oil inlet 16 and a cooling oil outlet 17 for cooling the generator.

A speed measuring sensor 18 corresponding to the first rotating shaft 10 is installed on the gear box 14, and a terminal board 19 in the figure is an outgoing line terminal board for outputting electric energy outwards.

Example two: as shown in fig. 2, the structure is different from that of the first embodiment in that the synchronizing gear 13 and the gear box 14 are disposed on the other side of the male screw rotor 5 and the female screw rotor 6, the gear box 14 is therefore disposed on the same side of the synchronizing gear 13, the corresponding speed sensor 18 is disposed in the generator housing 2, and the rest of the structure is the same as that of the first embodiment.

The utility model discloses utilize highly compressed working medium of high temperature to get into the rotatory electricity generation function that realizes of 3 drive positive screw rotors 5 and cloudy screw rotors 6 and generator rotor 8 of inflation working medium entry, the working medium after doing work becomes low temperature low pressure state and exports 4 discharges through inflation working medium.

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

Claims

1. The utility model provides a semi-closed ORC screw expander with shaft seal structure, its includes interconnect's screw rotor casing and generator casing, be provided with inflation working medium entry and inflation working medium export on the screw rotor casing, install complex positive screw rotor and negative screw rotor in the screw rotor casing, install generator stator and generator rotor in the generator casing, positive screw rotor with generator rotor coaxial arrangement, its characterized in that, the first pivot of positive screw rotor both sides and the second pivot of negative screw rotor both sides are connected bearing and bearing seal respectively, with one side first pivot with overlap respectively in the second pivot and be equipped with intermeshing's synchromesh gear.

2. The semi-closed ORC screw expander with a shaft seal structure of claim 1, wherein the surfaces of said male screw rotor and said female screw rotor are provided with self-lubricating wear-resistant and heat-resistant coatings.

3. The semi-closed ORC screw expander with a shaft seal structure according to claim 1, wherein said shaft seal comprises three sealing rings arranged side by side, two adjacent sets of said sealing rings being separated by a spacer, said sealing rings having a wave spring disposed therein.

4. The semi-closed ORC screw expander with shaft seal structure according to claim 1, wherein said shaft seals on said first and second shafts on the same side are connected to each other, and said shaft seals on both ends of said female screw rotor or said male screw rotor are connected by a balance tube.

5. The semi-closed ORC screw expander with shaft seal structure of claim 1, wherein said generator housing is provided with a cooling oil inlet and a cooling oil outlet.

6. The semi-closed ORC screw expander with shaft seal structure of claim 1, wherein a tachometer sensor corresponding to the second rotating shaft is mounted on the generator housing or the screw rotor housing.