Expander de-icing and ice-cutting device

Abstract

The application provides an ice removing and cutting device for a turbine expander, which comprises a nozzle, an impeller, a shaft seal, a main shaft, a back seal and a volute, the impeller is installed outside the main shaft, the impeller and the main shaft constitute a rotor set mechanism, the nozzle, the shaft seal and the back seal are installed inside the volute, the rotor set mechanism is installed inside the volute, the volute and the nozzle act on the circulating medium and deliver the circulating medium to the rotor set mechanism, and the rotor set mechanism acts on the circulating medium and does work. The top of the blade of the middle and rear parts of the impeller where ice is prone to form is provided with a cutter for cutting ice, the surface of the cutter is provided with ice removal grooves in sections, and the volute cover is provided with micro-holes for circulating temperature-increasing gas; thus, the ice is removed and cut at the same time, the device has the functions of ice removing and cutting, the efficiency of ice removing and maintenance is improved, and the safe operation of the turbine expander is ensured.

Description

Technical Field

[0001] The present invention relates to the field of expanders, and in particular to a deicing and ice cutting device for expanders. Background Art

[0002] A certain amount of water vapor is unavoidable in the working fluid of the turboexpander. For example, natural gas contains a certain amount of water vapor humidity. During the transportation of natural gas, we usually need to measure the water dew point temperature to determine the water content in the natural gas and ensure that its water vapor content does not freeze under extremely low temperature conditions.

[0003] When the working fluid enters the inlet of a turboexpander, it is typically in a superheated state (or at least a saturated state). As the working fluid expands and delivers mechanical work within the expander, the temperature at the expander outlet drops significantly, far greater than the temperature drop achieved by a throttling valve. At this point, although the high flow rate of the turboexpander results in a certain degree of subcooling at the outlet, condensation may still form in an area near the impeller outlet. Water vapor below 0°C will form solid ice, seriously impacting the safe operation of the turboexpander. Existing expander maintenance devices lack the dual functions of de-icing and ice removal, resulting in low maintenance efficiency and ice handling efficiency.

[0004] Therefore, it is necessary to provide an expander deicing and ice cutting device to solve the above technical problems. Summary of the Invention

[0005] The present invention provides an expander deicing and ice cutting device, which solves the problem that the existing expander maintenance device lacks the dual functions of deicing and ice cutting, resulting in low maintenance efficiency and low ice processing efficiency.

[0006] In order to solve the above technical problems, the present invention provides an expander deicing and ice cutting device, including a nozzle, an impeller, a shaft seal, a main shaft, a wheel back seal and a volute, wherein the impeller is installed on the outside of the main shaft, the impeller and the main shaft constitute a rotor group mechanism, the nozzle, shaft seal and wheel back seal are installed inside the volute, and the rotor group mechanism is installed inside the volute, the volute and the nozzle act on the circulating medium and transport it to the rotor group mechanism, the rotor group mechanism acts to receive the circulating medium and perform work, the side end of the volute is fixedly installed with an exhaust diffuser section, the exhaust diffuser section acts to discharge the medium that does work on the rotor group mechanism, the surface of the impeller is fixedly installed with a orifice plate and a blade, the ends of the orifice plate and the blade are fixedly installed, the plate surface of the blade is penetrated by micropores, the plate surface of the orifice plate is penetrated by a flow channel, the blade is provided with an inner cavity hole, the surface of the orifice plate is provided with an inner hole, the side end of the blade is fixedly installed with a cutter, and the surface of the cutter is provided with an ice-removing groove.

[0007] Preferably, the number of the blades is multiple, and the multiple blades are equidistantly arranged around the outside of the main shaft.

[0008] Preferably, the wheel back seal is arranged on the back of the impeller.

[0009] Preferably, there is a cavity between the wheel back seal and the shaft seal.

[0010] Preferably, the orifice plate acts to control the flow rate of the heated gas.

[0011] Preferably, the connecting end of the volute and the exhaust diffuser section is in a communicating state.

[0012] Preferably, the micropores are circular through holes, and there are multiple micropores.

[0013] Compared with the related art, the expander deicing and ice cutting device provided by the present invention has the following beneficial effects:

[0014] The present invention provides an expander deicing and ice cutting device; by introducing warming gas into the middle and rear flow channel of the impeller where ice may form, the warming gas passes through the impeller back and blades, flows to the flow channels of equal number, enters the interior of the impeller, and enters the channel of the blade inner cavity hole from the root of the blade, and finally flows into the main flow channel through a large number of micropores on the blade surface; while controlling the flow rate of the warming gas, the gas is allowed to penetrate from the inner cavity hole through the countless micropores on the blade wall surface, just like sweating; by the mixed gas of the medium and the sealing buffer gas in the cavity between the wheel back seal and the shaft seal The invention relates to a method for heating gas; the flow rate of the heating gas is controlled by replacing the orifice plate, and a small amount of the flow rate of the heating gas is adjusted by the external buffer gas pressure; an ice-cutting cutter is provided at the top of the blade in the middle and rear part of the impeller where ice is easily formed, and ice-removing grooves are provided in sections on the surface of the cutter, and micropores for the circulation of the heating gas are provided to heat the volute shroud; thus, the ice can be cut by the provided cutter body structure while heating and deicing are being performed, so that the device has both the functions of deicing and ice cutting, thereby improving the efficiency of deicing maintenance and ensuring the safe operation of the turbine expander. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic structural diagram of the present invention;

[0016] Figure 2 Another structural diagram provided by the present invention;

[0017] Figure 3 Another structural diagram provided by the present invention;

[0018] Figure 4 Another structural diagram provided by the present invention;

[0019] Figure 5Another structural diagram provided by the present invention;

[0020] Figure 6 Another structural diagram provided by the present invention;

[0021] Figure 7 Another structural diagram provided by the present invention.

[0022] Numbers in the figure: 1. Nozzle; 2. Impeller; 3. Shaft seal; 4. Main shaft; 5. Wheel back seal; 6. Volute; 7. Exhaust diffuser section; 8. Orifice plate; 9. Blade; 10. Flow channel; 11. Micropore; 12. Inner cavity hole; 13. Inner hole; 14. Cutter; 15. De-icing chute. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Example 1: Please refer to Figure 1-7 ; The expander deicing and ice cutting device includes a nozzle 1, an impeller 2, a shaft seal 3, a main shaft 4, a wheel back seal 5 and a volute 6. The impeller 2 is installed on the outside of the main shaft 4. The impeller 2 and the main shaft 4 constitute a rotor group mechanism. The nozzle 1, the shaft seal 3 and the wheel back seal 5 are installed inside the volute 6. The rotor group mechanism is installed inside the volute 6. The volute 6 and the nozzle 1 act on the circulating medium and transport it to the rotor group mechanism. The rotor group mechanism acts to receive the circulating medium and perform work. The side end of the volute 6 is fixedly installed with an exhaust diffuser section 7. The exhaust diffuser section 7 acts to discharge the medium that performs work on the rotor group mechanism. The surface of the impeller 2 is fixedly installed with a orifice plate 8 and a blade 9. The ends of the orifice plate 8 and the blade 9 are fixedly installed. Micropores 11 are opened through the plate surface of the blade 9. A circulation channel 10 is opened through the plate surface of the orifice plate 8. The blade 9 has an inner cavity hole 12. The surface of the orifice plate 8 has an inner hole 13. The side end of the blade 9 is fixedly installed with a cutter 14, and the surface of the cutter 14 has an ice-removing groove 15.

[0025] In the present invention, there are multiple blades 9 , and the multiple blades 9 are equidistantly arranged around the outside of the main shaft 4 .

[0026] In the present invention, the wheel back seal 5 is provided on the back of the impeller 2 .

[0027] In the present invention, a cavity is formed between the wheel back seal 5 and the shaft seal 3 .

[0028] In the present invention, the orifice plate 8 is used to control the flow rate of the heating gas.

[0029] Example 2: Please refer to Figure 1-7; The expander deicing and ice cutting device includes a nozzle 1, an impeller 2, a shaft seal 3, a main shaft 4, a wheel back seal 5 and a volute 6. The impeller 2 is installed on the outside of the main shaft 4. The impeller 2 and the main shaft 4 constitute a rotor group mechanism. The nozzle 1, the shaft seal 3 and the wheel back seal 5 are installed inside the volute 6. The rotor group mechanism is installed inside the volute 6. The volute 6 and the nozzle 1 act on the circulating medium and transport it to the rotor group mechanism. The rotor group mechanism acts to receive the circulating medium and perform work. The side end of the volute 6 is fixedly installed with an exhaust diffuser section 7. The exhaust diffuser section 7 acts to discharge the medium that performs work on the rotor group mechanism. The surface of the impeller 2 is fixedly installed with a orifice plate 8 and a blade 9. The ends of the orifice plate 8 and the blade 9 are fixedly installed. Micropores 11 are opened through the plate surface of the blade 9. A circulation channel 10 is opened through the plate surface of the orifice plate 8. The blade 9 has an inner cavity hole 12. The surface of the orifice plate 8 has an inner hole 13. The side end of the blade 9 is fixedly installed with a cutter 14, and the surface of the cutter 14 has an ice-removing groove 15.

[0030] In the present invention, there are multiple blades 9 , and the multiple blades 9 are equidistantly arranged around the outside of the main shaft 4 .

[0031] In the present invention, the wheel back seal 5 is provided on the back of the impeller 2 .

[0032] In the present invention, a cavity is formed between the wheel back seal 5 and the shaft seal 3 .

[0033] In the present invention, the orifice plate 8 is used to control the flow rate of the heating gas.

[0034] In the present invention, the connection ends of the volute 6 and the exhaust diffuser section 7 are in a communicating state.

[0035] Example 3: Please refer to Figure 1-7 ; The expander deicing and ice cutting device includes a nozzle 1, an impeller 2, a shaft seal 3, a main shaft 4, a wheel back seal 5 and a volute 6. The impeller 2 is installed on the outside of the main shaft 4. The impeller 2 and the main shaft 4 constitute a rotor group mechanism. The nozzle 1, the shaft seal 3 and the wheel back seal 5 are installed inside the volute 6. The rotor group mechanism is installed inside the volute 6. The volute 6 and the nozzle 1 act on the circulating medium and transport it to the rotor group mechanism. The rotor group mechanism acts to receive the circulating medium and perform work. The side end of the volute 6 is fixedly installed with an exhaust diffuser section 7. The exhaust diffuser section 7 acts to discharge the medium that performs work on the rotor group mechanism. The surface of the impeller 2 is fixedly installed with a orifice plate 8 and a blade 9. The ends of the orifice plate 8 and the blade 9 are fixedly installed. Micropores 11 are opened through the plate surface of the blade 9. A circulation channel 10 is opened through the plate surface of the orifice plate 8. The blade 9 has an inner cavity hole 12. The surface of the orifice plate 8 has an inner hole 13. The side end of the blade 9 is fixedly installed with a cutter 14, and the surface of the cutter 14 has an ice-removing groove 15.

[0036] In the present invention, there are multiple blades 9 , and the multiple blades 9 are equidistantly arranged around the outside of the main shaft 4 .

[0037] In the present invention, the wheel back seal 5 is provided on the back of the impeller 2 .

[0038] In the present invention, a cavity is formed between the wheel back seal 5 and the shaft seal 3 .

[0039] In the present invention, the orifice plate 8 is used to control the flow rate of the heating gas.

[0040] In the present invention, the connection ends of the volute 6 and the exhaust diffuser section 7 are in a communicating state.

[0041] In the present invention: the micropore 11 is a circular through hole, and the number of micropores 11 is multiple.

[0042] The working principle of the expander deicing and ice cutting device provided by the present invention is as follows:

[0043] By introducing warming gas into the middle and rear flow passages of the impeller 2 where ice may form, the warming gas passes through the impeller back and blades 9, flows to an equal number of flow passages 10, enters the interior of the impeller 2, and enters the channel of the blade inner cavity 12 from the root of the blade 9, and finally flows into the main flow passage through a large number of micropores 11 on the surface of the blade 9; the flow rate of the warming gas is controlled so that the gas penetrates from the inner cavity 12 through the countless micropores 11 on the wall of the blade 9, just like sweating; a mixture of the medium and the sealing buffer gas in the cavity between the wheel back seal 5 and the shaft seal 3 is used as the warming gas; the warming gas flow rate is controlled by replacing the orifice plate 8, and a small amount of warming gas flow rate is adjusted by the external buffer gas pressure; an ice-cutting cutter 14 is provided at the top of the blade 9 in the middle and rear part of the impeller 2 where ice is likely to form, and de-icing grooves 15 are provided in sections on the surface of the cutter 14, and micropores 12 for the circulation of warming gas are provided to heat the shroud of the volute 6.

[0044] Compared with the related art, the expander deicing and ice cutting device provided by the present invention has the following beneficial effects: while performing heating and deicing, ice cutting can be performed through the provided blade structure, so that the device has both deicing and ice cutting functions, improves the efficiency of deicing maintenance, and ensures the safe operation of the turbine expander.

[0045] The above descriptions are merely embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An expander deicing and ice cutting device, comprising a nozzle, an impeller, a shaft seal, a main shaft, a wheel back seal and a volute, characterized in that: The impeller is mounted on the outside of the main shaft, and the impeller and the main shaft form a rotor group mechanism. The nozzle, shaft seal and wheel back seal are mounted inside the volute, and the rotor group mechanism is mounted inside the volute. The volute and nozzle act on the circulating medium and transport it to the rotor group mechanism. The rotor group mechanism acts to receive the circulating medium and perform work. The side end of the volute is fixedly mounted with an exhaust diffuser section, and the exhaust diffuser section acts to discharge the medium that does work on the rotor group mechanism. The surface of the impeller is fixedly mounted with an orifice plate and blades, and the ends of the orifice plate and blades are fixedly mounted. Micropores are opened through the plate surface of the blade, and a circulation channel is opened through the plate surface of the orifice plate. The blade has an inner cavity hole, and the surface of the orifice plate has an inner hole. A cutter is fixedly mounted on the side end of the blade, and the surface of the cutter has an ice-removing groove.

2. The expander deicing and ice cutting device according to claim 1, characterized in that: There are multiple blades, and the blades are equidistantly arranged around the outside of the main shaft.

3. The expander deicing and ice cutting device according to claim 1, characterized in that: The wheel back seal is arranged on the back of the impeller.

4. The expander deicing and ice cutting device according to claim 1, characterized in that: A cavity is formed between the wheel back seal and the shaft seal.

5. The expander deicing and ice cutting device according to claim 1, characterized in that: The orifice plate is used to control the flow rate of the heated gas.

6. The expander deicing and ice cutting device according to claim 1, characterized in that: The connection end of the volute and the exhaust diffuser section is in a communicating state.

7. The expander deicing and ice cutting device according to claim 1, characterized in that: The micropores are circular through holes, and there are multiple micropores.

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