ORC turbine super-speed protection and alarm device

Abstract

The present application relates to the technical field of expander, in particular to an ORC turbine mechanical overspeed protection and alarm device, which comprises a blocking assembly, a fly hammer assembly and an alarm assembly; the blocking assembly comprises a lower valve body, an upper valve body, a valve rod, a striking head, a ball bearing, a handle, an oil-containing bearing, a half-round head screw, a first spring and a steel ball; when the critical blocking valve rod is in a pressure maintaining position, compressed air will press the valve rod tightly on the abutting surface, forming a dead space for pressure maintaining; when the valve rod is in a pressure releasing position, the valve rod sealing abutting surface is separated, the sealing dead space is connected with the outlet of the critical blocking device for pressure releasing, and the quick closing valve is closed; in normal working condition, the valve rod is in a pressure maintaining state; when the rotating speed of the ORC expander exceeds 110% of the working rotating speed without shutdown, the fly hammer assembly will strike the striking head, the striking causes the valve rod position to move to the pressure releasing position, the quick closing valve is closed, and the unit is stopped, thereby improving the safety of the unit.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of expansion machines, in particular to an ORC turbine machine overspeed protection and alarm device. BACKGROUND

[0002] The turbine expansion machine is a key machine necessary for air separation equipment, natural gas liquefaction separation equipment and low-temperature pulverizing equipment to obtain cold energy, and is the heart for ensuring stable operation of the whole equipment; the existing ORC expansion machine set considers factors such as sealing leakage, and the overspeed protection device of the machine set only relies on electronic overspeed protection, and the protection effect is insufficient. SUMMARY

[0003] The application aims to provide an ORC turbine machine overspeed protection and alarm device which can provide protection when the ORC expansion machine is operated at overspeed and improve the safety of the machine set.

[0004] To achieve the above-mentioned purpose, the application provides an ORC turbine machine overspeed protection and alarm device which comprises a blocking assembly, a fly hammer assembly and an alarm assembly.

[0005] The blocking assembly comprises a lower valve body, an upper valve body, a valve rod, a striking head, a ball bearing, a handle, an oil-containing bearing, a half-round head screw, a first spring and a steel ball.

[0006] The upper valve body and the lower valve body are fixedly connected and located at the side of the lower valve body, and the upper valve body is provided with an air inlet and an air outlet; the valve rod is arranged in the upper valve body and the lower valve body; the striking head is threadedly connected with the valve rod and located at one end of the valve rod; the ball bearing is arranged between the lower valve body and the valve rod; the handle is threadedly connected with the valve rod and located at the end of the valve rod away from the striking head; the oil-containing bearing is arranged between the valve rod and the handle; the half-round head screw is threadedly connected with the handle and located at the side of the handle; the first spring is arranged in the handle, and the steel ball is arranged in the handle; the fly hammer assembly is arranged at the side of the striking head, and the alarm assembly is arranged at the side of the air outlet.

[0007] The blocking assembly further comprises two first sealing rings, a second sealing ring and three third sealing rings.

[0008] The two first sealing rings are arranged between the valve rod and the lower valve body respectively; the second sealing ring is arranged in the upper valve body; and the three third sealing rings are arranged in the handle respectively.

[0009] The fly hammer assembly comprises a main shaft, a bushing, an adjusting sleeve, a second spring, a fly hammer, a sliding sleeve and a nut.

[0010] The main shaft is located at the side of the impact head; the bushing and the main shaft are threadedly connected and located inside the main shaft; the adjusting sleeve and the bushing are threadedly connected and located between the bushing and the main shaft; the second spring is located between the bushing and the adjusting sleeve; the fly hammer and the bushing are slidingly connected and penetrate through the bushing; the sliding sleeve and the fly hammer are slidingly connected and located at the side of the fly hammer; and the nut and the fly hammer are threadedly connected and located at the side of the fly hammer.

[0011] The fly hammer assembly further comprises a fixing screw; the fixing screw is threadedly connected with the main shaft and the bushing and located at the side of the main shaft.

[0012] The fly hammer assembly further comprises a retaining screw; the retaining screw is threadedly connected with the main shaft and located at the side of the main shaft.

[0013] The alarm assembly comprises a valve seat, a valve body, a connecting screw, a valve block, a third spring, a whistle body and a whistle spring tongue.

[0014] The valve seat is in communication with the gas outlet, and the valve body is located at the side of the valve seat; the connecting screw is threadedly connected with the valve seat and the valve body and located at the side of the valve body; the valve block is arranged inside the valve seat; the third spring is located between the valve block and the valve body; the whistle body is threadedly connected with the valve body and located at the side of the valve body; and the whistle spring tongue is arranged inside the whistle body.

[0015] The alarm assembly further comprises a wire, a lead seal and a fastening screw; the wire is arranged at the side of the connecting screw; the lead seal is arranged at the side of the wire; and the fastening screw is threadedly connected with the valve body and located at the side of the valve body.

[0016] The application discloses an ORC turbine super-speed protection and alarm device, wherein a speed closing valve of an ORC turbine unit adopts a pneumatic normally closed valve, the valve is opened by a spring in a compressed air cylinder through electromagnetic valve switching to connect a 0.5Mpa compressed air inlet pipe during operation, and a branch of the compressed air inlet pipe after the electromagnetic valve is connected to an air inlet of a cutoff assembly on an ORC expander shell, a valve rod of the cutoff assembly is in a pressure maintaining position (speed closing valve opening state) and is pulled out to be in a pressure releasing position (speed closing valve closing state) through a handle. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without any creative effort.

[0018] Fig. 1 Fig. 1 is a structural schematic diagram of an ORC turbine super-speed protection and alarm device.

[0019] Fig. 2 Fig. 2 is a structural schematic diagram of a cutoff assembly.

[0020] Fig. 3 Fig. 3 is a structural schematic diagram of a fly hammer assembly.

[0021] Fig. 4 Fig. 4 is a structural schematic diagram of an alarm assembly.

[0022] 1 - cut-off assembly, 2 - fly hammer assembly, 3 - alarm assembly, 4 - lower valve body, 5 - upper valve body, 6 - valve rod, 7 - impact head, 8 - ball bearing, 9 - handle, 10 - oil- containing bearing, 11 - half-round head screw, 12 - first spring, 13 - steel ball, 14 - air inlet, 15 - air outlet, 16 - first sealing ring, 17 - second sealing ring, 18 - third sealing ring, 19 - main shaft, 20 - bushing, 21 - adjusting sleeve, 22 - second spring, 23 - fly hammer, 24 - sliding sleeve, 25 - nut, 26 - fixing screw, 27 - clamping screw, 28 - valve seat, 29 - valve body, 30 - connecting screw, 31 - valve block, 32 - third spring, 33 - flute body, 34 - flute spring tongue, 35 - iron wire, 36 - lead seal, 37 - fastening screw. DETAILED DESCRIPTION

[0023] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein like or similar constituent elements or elements having the same or similar functions are denoted by like reference characters throughout the attached drawing figures. The embodiments described below are exemplary and are intended to be illustrative of the present application rather than limiting.

[0024] Referring to Figs. 1-4 The present application provides an ORC turbine super-speed protection and alarm device, which comprises a cut-off assembly 1, a fly hammer assembly 2 and an alarm assembly 3.

[0025] The cut-off assembly 1 comprises a lower valve body 4, an upper valve body 5, a valve rod 6, an impact head 7, a ball bearing 8, a handle 9, an oil-containing bearing 10, a half-round head screw 11, a first spring 12 and a steel ball 13.

[0026] The upper valve body 5 and the lower valve body 4 are fixedly connected and located at the side of the lower valve body 4, and the upper valve body 5 has an air inlet 14 and an air outlet 15; the valve rod 6 is arranged inside the upper valve body 5 and the lower valve body 4; the impact head 7 is threadedly connected with the valve rod 6 and located at one end of the valve rod 6; the ball bearing 8 is arranged between the lower valve body 4 and the valve rod 6; the handle 9 is threadedly connected with the valve rod 6 and located at the end of the valve rod 6 away from the impact head 7; the oil-containing bearing 10 is arranged between the valve rod 6 and the handle 9; the half-round head screw 11 is threadedly connected with the handle 9 and located at the side of the handle 9; the first spring 12 is arranged inside the handle 9, and the steel ball 13 is arranged inside the handle 9; the fly hammer assembly 2 is arranged at the side of the impact head 7, and the alarm assembly 3 is arranged at the side of the air outlet 15.

[0027] In the embodiment, the quick closing valve of the ORC turbine unit adopts a pneumatic normally closed valve. When working, the valve is opened by switching the electromagnetic valve to connect the 0.5 MPa compressed air inlet pipe and the spring in the compressed air cylinder. At the same time, the compressed air inlet pipe after the electromagnetic valve is connected to the inlet 14 of the cutoff assembly 1 on the ORC expander shell. The valve rod 6 of the cutoff assembly 1 is in the pressure maintaining position (quick closing valve open state), and the valve rod 6 is pulled out by the handle 9 to be in the pressure relief position (quick closing valve closed state). When the emergency cutoff valve rod 6 is in the pressure maintaining position, the compressed air presses the valve rod 6 tightly against the abutting surface, forming a pressure maintaining dead space. When the valve rod 6 is in the pressure relief position, the valve rod 6 separates from the abutting surface, the sealed dead space is connected to the outlet of the emergency cutoff device for pressure relief, and the quick closing valve is closed. The outlet 15 of the cutoff assembly 1 is provided with the alarm assembly 3, which can emit an alarm siren.

[0028] In normal operation, the valve rod 6 is in the pressure maintaining state. When the ORC expander rotates at a speed exceeding 110% of the working speed without being stopped, the hammer assembly 2 will hit the impact head 7. The impact causes the valve rod 6 to move to the pressure relief position, the quick closing valve is closed, and the unit is stopped. Through the above-mentioned mode, protection can be provided when the ORC expander is running at an excessive speed, and the safety of the unit is improved.

[0029] Further, the cutoff assembly 1 further comprises two first sealing rings 16, a second sealing ring 17 and three third sealing rings 18.

[0030] The two first sealing rings 16 are respectively arranged between the valve rod 6 and the lower valve body 4. The second sealing ring 17 is arranged inside the upper valve body 5. The three third sealing rings 18 are respectively arranged inside the handle 9.

[0031] In the embodiment, by arranging the first sealing ring 16, the second sealing ring 17 and the third sealing ring 18, the sealing performance can be improved.

[0032] Further, the hammer assembly 2 comprises a main shaft 19, a bushing 20, an adjusting sleeve 21, a second spring 22, a hammer 23, a sliding sleeve 24 and a nut 25.

[0033] The main shaft 19 is located at the side of the impact head 7. The bushing 20 is threadedly connected with the main shaft 19 and is located inside the main shaft 19. The adjusting sleeve 21 is threadedly connected with the bushing 20 and is located between the bushing 20 and the main shaft 19. The second spring 22 is located between the bushing 20 and the adjusting sleeve 21. The hammer 23 is slidingly connected with the bushing 20 and penetrates through the bushing 20. The sliding sleeve 24 is slidingly connected with the hammer 23 and is located at the side of the hammer 23. The nut 25 is threadedly connected with the hammer 23 and is located at the side of the hammer 23.

[0034] In the embodiment, the adjusting sleeve 21 and the bushing 20 are threadedly connected, and the position of the adjusting sleeve 21 can be changed by rotating, so as to change the compression of the second spring 22 and the rotating speed of the hammer 23. The hammer 23 is installed in the inner hole of the bushing 20, the sleeve 24 and the nut 25 are installed at the tail end of the hammer 23 and form an integral body with the hammer 23, the sleeve 24 is used to compress the second spring 22 when the hammer 23 works, the second spring 22 is placed in the inner cavity formed by the bushing 20 and the adjusting sleeve 21, and the outer surface of the bushing 20 is used to guide the hammer 23 spring.

[0035] Further, the hammer assembly 2 further comprises a fixing screw 26, the fixing screw 26 is threadedly connected with the main shaft 19 and the bushing 20, and is located at the side of the main shaft 19.

[0036] In the embodiment, the fixing screw 26 is used to prevent the bushing 20 from rotating relative to the inner hole of the main shaft 19.

[0037] Further, the hammer assembly 2 further comprises a fixing screw 26, the fixing screw 26 is threadedly connected with the main shaft 19 and the bushing 20, and is located at the side of the main shaft 19.

[0038] In the embodiment, the fixing screw 27 is used to fix the position of the adjusting sleeve 21.

[0039] Further, the alarm assembly 3 comprises a valve seat 28, a valve body 29, a connecting screw 30, a valve block 31, a third spring 32, a whistle body 33 and a whistle spring tongue 34.

[0040] The valve seat 28 is communicated with the air outlet 15, the valve body 29 is located at the side of the valve seat 28, the connecting screw 30 is threadedly connected with the valve seat 28 and the valve body 29, and is located at the side of the valve body 29, the valve block 31 is arranged in the valve seat 28, the third spring 32 is located between the valve block 31 and the valve body 29, the whistle body 33 is threadedly connected with the valve body 29 and is located at the side of the valve body 29, and the whistle spring tongue 34 is arranged in the whistle body 33.

[0041] In the embodiment, the third spring 32 is set to 0.2Mpa.a, the compressed air discharged through the air outlet 15 pushes the third spring 32 at the valve block 31 to release pressure and discharge into the atmosphere, and the alarm whistle is sounded.

[0042] Further, the alarm assembly 3 further comprises a wire 35, a lead seal 36 and a fastening screw 37; the wire 35 is arranged at the side of the connecting screw 30; the lead seal 36 is arranged at the side of the wire 35; the fastening screw 37 is screwed with the valve body 29 and is arranged at the side of the valve body 29.

[0043] In the embodiment, the fastening screw 37 is used for fixing the flute body 33, and the wire 35 and the lead seal 36 are used for preventing the connecting screw 30 from falling off.

[0044] The ORC turbine super-speed protection and alarm device of the application is characterized in that: the speed closing valve of the ORC turbine unit is a pneumatic normally closed valve, which is opened by the compressed air in the air cylinder through the spring when the electromagnetic valve is switched to connect the 0.5Mpa.a compressed air inlet pipe, and the compressed air inlet pipe after the electromagnetic valve is connected to the air inlet 14 of the blocking assembly 1 on the ORC expander shell, the valve rod 6 of the blocking assembly 1 is in the pressure maintaining position (the speed closing valve is opened) and is pulled out by the handle 9 to be in the pressure releasing position (the speed closing valve is closed). When the emergency blocking valve rod 6 is in the pressure maintaining position, the compressed air presses the valve rod 6 tightly on the abutting surface to form a pressure maintaining dead space; when the valve rod 6 is in the pressure releasing position, the valve rod 6 separates from the abutting surface, the dead space is connected to the outlet of the emergency blocking device to release pressure, and the speed closing valve is closed; the valve seat 28 is arranged at the air outlet 15 of the blocking assembly 1, the third spring 32 is set to 0.2Mpa.a, the compressed air discharged through the air outlet 15 pushes open the third spring 32 at the valve block 31 to release pressure and discharge into the atmosphere, and the alarm siren is sounded.

[0045] In normal operation, the valve rod 6 is in the pressure maintaining state, when the ORC expander rotates at a speed exceeding 110% of the working speed without shutdown, the fly hammer 23 compresses the second spring 22 by eccentric force, the fly hammer 23 flies out to hit the impact head 7, which causes the valve rod 6 to move to the pressure releasing position, the speed closing valve is closed, and the unit is shut down. The adjustment of the fly hammer 23 action speed is realized by adjusting the compression amount of the second spring 22 through the adjusting sleeve 21. Through the above-mentioned mode, protection can be provided when the ORC expander operates at a speed exceeding the working speed, and the safety of the unit is improved.

[0046] The above only discloses a preferred embodiment of the application, and of course cannot limit the scope of the application, and those skilled in the art can understand that all or part of the above-mentioned processes can be implemented, and equivalent changes made according to the claims of the application still belong to the scope of the application.

Claims

1. An ORC turbine overspeed protection and alarm device, characterized in that, it comprises a shutdown assembly, a flyweight assembly and an alarm assembly; the shutdown assembly comprises a lower valve body, an upper valve body, a valve rod, a striker head, a ball bearing, a handle, an oil-containing bearing, a half-round head screw, a first spring and a steel ball; the upper valve body and the lower valve body are fixedly connected and located on the side of the lower valve body, the upper valve body has an air inlet and an air outlet; the valve rod is arranged inside the upper valve body and the lower valve body; the striker head is threadedly connected with the valve rod and located at one end of the valve rod; the ball bearing is arranged between the lower valve body and the valve rod; the handle is threadedly connected with the valve rod and located at the end of the valve rod away from the striker head; the oil-containing bearing is arranged between the valve rod and the handle; the half-round head screw is threadedly connected with the handle and located on the side of the handle; the first spring is arranged inside the handle, and the steel ball is arranged inside the handle; the flyweight assembly is arranged on the side of the striker head, and the alarm assembly is arranged on the side of the air outlet.

2. The ORC turbine overspeed protection and alarm device according to claim 1, characterized in that, the shutdown assembly further comprises two first sealing rings, a second sealing ring and three third sealing rings; the two first sealing rings are respectively arranged between the valve rod and the lower valve body; the second sealing ring is arranged inside the upper valve body; and the three third sealing rings are respectively arranged inside the handle.

3. The ORC turbine overspeed protection and alarm device according to claim 2, characterized in that, the flyweight assembly comprises a main shaft, a bushing, an adjusting sleeve, a second spring, a flyweight, a sliding sleeve and a nut; the main shaft is located on the side of the striker head; the bushing is threadedly connected with the main shaft and located inside the main shaft; the adjusting sleeve is threadedly connected with the bushing and located between the bushing and the main shaft; the second spring is located between the bushing and the adjusting sleeve; the flyweight is slidingly connected with the bushing and penetrates through the bushing; the sliding sleeve is slidingly connected with the flyweight and located on the side of the flyweight; and the nut is threadedly connected with the flyweight and located on the side of the flyweight.

4. The ORC turbine overspeed protection and alarm device according to claim 3, characterized in that, the flyweight assembly further comprises a fixing screw; the fixing screw is threadedly connected with the main shaft and the bushing and located on the side of the main shaft.

5. The ORC turbine overspeed protection and alarm device according to claim 4, characterized in that, the flyweight assembly further comprises a clamping screw; the clamping screw is threadedly connected with the main shaft and located on the side of the main shaft.

6. The ORC turbine overspeed protection and alarm device according to claim 5, characterized in that, the alarm assembly comprises a valve seat, a valve body, a connecting screw, a valve block, a third spring, a flute body and a flute spring tongue. The valve seat and the air outlet are communicated, the valve body is located at the side of the valve seat; the connecting screw is threadedly connected with the valve seat and the valve body, and is located at the side of the valve body; the valve block is arranged in the valve seat; the third spring is located between the valve block and the valve body; the flute body is threadedly connected with the valve body, and is located at the side of the valve body; the flute spring tongue is arranged in the flute body.

7. An ORC turbomachinery overspeed protection and alarm device according to claim 6, characterized in that, The alarm assembly further comprises a wire, a lead seal and a fastening screw; the wire is arranged at the side of the connecting screw; the lead seal is arranged at the side of the wire; and the fastening screw is threadedly connected with the valve body and located at the side of the valve body.

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