An expander that is easily disassembled and assembled

Abstract

This utility model relates to the field of expander technology and discloses an expander that is easy to disassemble and assemble. The expander includes: a volute housing; a fixed pipe is fixedly installed on the rear side of the volute housing; a connecting pipe is fixedly installed on the rear end of the fixed pipe; a guide shroud is inserted into the inner end of the fixed pipe; a sealing ring is fixedly installed inside the guide shroud; and an electromagnetic bearing is fitted into the front side of the volute housing. When disassembly is required, a solenoid valve is opened, and air is supplied to the oil circuit of the housing via an air pump. Since the air inlet pipe is located at the top of the housing, the gas accumulates at the top of the oil circuit and exerts a downward force on the hydraulic oil. The hydraulic oil inside the oil circuit, under the influence of air pressure, will quickly discharge from the oil delivery pipe at the bottom, thereby shortening the oil discharge time. Simultaneously, when oil is injected into the housing through the oil delivery pipe, the air in the housing's oil circuit can be discharged through the air inlet pipe to avoid air bubbles inside the oil circuit, thus facilitating disassembly and assembly.

Description

Technical Field

[0001] This utility model relates to the field of expander technology, specifically an expander that is easy to disassemble and assemble. Background Technology

[0002] An expander is a machine that utilizes the principle of reducing gas temperature by outputting mechanical work when compressed gas expands and decreases pressure. Expanders are commonly used in cryogenic equipment. Based on their motion and structure, expanders are classified into two types: piston expanders and turbine expanders. Piston expanders are mainly suitable for small to medium-sized high and medium pressure cryogenic equipment with high pressure ratios and low flow rates.

[0003] A relevant reference is Chinese utility model patent CN214366232U, which discloses a cold-insulating end cap for an expander and the expander itself, relating to the field of expander equipment technology. The cold-insulating end cap of this expander includes an insulating end cap body for separating the inlet high-temperature medium and the outlet low-temperature medium of the expander. The insulating end cap body has an axially formed inner hole for the passage of the low-temperature medium. One end of the insulating end cap body has a filling port, which is fitted with a screw plug and a sealing cap. The side wall of the insulating end cap body has a receiving cavity communicating with the filling port, and the receiving cavity is filled with heat-insulating material. The heat-insulating material is filled into the receiving cavity through the filling port, and then the receiving cavity is sealed by the screw plug and the sealing cap, increasing the thermal resistance in the thickness direction of the wall of the insulating end cap body, thereby achieving a heat insulation effect. This expander is a turbine expander, and with the aforementioned cold-insulating end cap, it is difficult for the inlet high-temperature medium to supply heat to the outlet low-temperature medium, thus ensuring the cold energy grade of the outlet medium and avoiding affecting subsequent distillation and other process systems.

[0004] Because a turbo expander has an expanding worm gear at one end and a compressing worm gear at the other, the pressure at the compression end is high and the pressure at the expansion end is low when the expander starts. This causes the internal connecting shaft to move towards the low-pressure expansion end, resulting in wear on the side of the shaft closest to the expansion end. To avoid extending the shaft's lifespan, hydraulic pressure is typically used to balance the thrust of the worm gear during rotation. This method requires completely draining the internal oil during disassembly, making the operation very inconvenient. Additionally, since the shaft rotates after startup, bearings are generally used to reduce friction during rotation. However, because the expander's speed is around 25,000 rpm, the bearings have a short lifespan and need to be replaced after the expander has been operating for a period of time. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] In view of the shortcomings of the prior art, this utility model provides an expander that is easy to disassemble and assemble, which has the advantages of easy disassembly and assembly and can reduce the number of maintenance times, thus solving the above-mentioned technical problems.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: an expander that is easy to disassemble and assemble, comprising: a volute, a fixed pipe fixedly installed on the rear side of the volute, a connecting pipe fixedly installed on the rear end of the fixed pipe, a flow guide shroud inserted through the inner end of the fixed pipe, a sealing ring fixedly installed inside the flow guide shroud, an electromagnetic bearing fitted on the front side of the volute, a housing fixedly installed on the front side of the volute, an oil supply pipe inserted through the lower part of the housing, an air inlet pipe inserted through the upper part of the housing, a solenoid valve fixedly installed above the air inlet pipe, an air pump fixedly installed above the solenoid valve, a fixed frame fixedly installed on the outer side of the air pump, a rotating shaft movably installed at the center of the housing, an expansion impeller fixedly installed at the front end of the rotating shaft, a compression impeller fixedly installed at the rear end of the rotating shaft, a connecting plate fixedly installed at the front end of the rear end of the housing, an air inlet chamber fixedly installed on the front side of the connecting plate, and a conical tube fixedly installed inside the air inlet chamber; the sealing ring can prevent gas from entering the cavity of the flow guide shroud.

[0009] As a preferred embodiment of this utility model, the rear end of the fixing tube is fixedly connected to the rear side of the volute, and the front end of the fixing tube does not contact the inner wall of the volute; the fixing tube can restrict the position of the connecting tube and the guide shroud.

[0010] As a preferred embodiment of this utility model, the connecting pipe is fixedly connected to the fixed pipe by bolts, the inner wall of the flow guide is provided with an arc surface structure, the flow guide is provided with a cavity, and the sealing ring is fixedly installed inside the cavity of the flow guide; the flow guide facilitates the rotation of the gas-driven compression impeller.

[0011] As a preferred embodiment of this utility model, the housing is fixedly connected to the volute by bolts, and the oil supply pipe and air intake pipe are connected to the inner cavity of the housing; the housing can restrict the position of the rotating shaft.

[0012] As a preferred embodiment of this utility model, the rotating shaft and the housing are rotatably connected, the expansion impeller is rotatably connected to the connecting plate via an electromagnetic bearing, and the compression impeller is rotatably connected to the volute via an electromagnetic bearing; the rotating shaft enables the expansion impeller and the compression impeller to rotate synchronously.

[0013] As a preferred embodiment of this utility model, the front end of the expansion impeller extends into the interior of the conical tube, and the front end of the compression impeller extends into the interior of the guide shroud; the expansion impeller can expand the gas volume when rotating, and the compression impeller can compress the gas volume when rotating.

[0014] As a preferred embodiment of this utility model, the connecting plate is fixedly connected to the housing by bolts, and the top of the air inlet chamber is provided with a tubular structure communicating with the inner cavity. The inner wall of the tapered tube is tapered. The air inlet chamber facilitates the passage of gas through the expansion impeller.

[0015] Compared with the prior art, this utility model provides an expander that is easy to disassemble and assemble, and has the following beneficial effects:

[0016] 1. This utility model utilizes electromagnetic bearings to achieve a rotatable connection between the expansion impeller and the connecting plate, and between the compression impeller and the volute casing. The electromagnetic bearings reduce the relative friction between the expansion and compression impellers and the connecting plate and volute casing during rotation. Since the inner ring of the electromagnetic bearing is suspended by electromagnetic force, it does not contact the outer ring during use, thus reducing wear. This method also prevents the shaft from contacting the front and rear ends of the casing, further reducing shaft wear and maintenance frequency.

[0017] 2. This utility model incorporates an air pump with a solenoid valve fixedly installed at its bottom. The air pump is connected to the air inlet pipe via the solenoid valve. When the expander is working, the solenoid valve is closed, keeping the internal oil circuit closed. When disassembly is required, the solenoid valve is opened, and air is supplied to the oil circuit inside the housing via the air pump. Since the air inlet pipe is located at the top of the housing, the gas will accumulate at the top of the oil circuit and exert a downward force on the hydraulic oil. After being affected by the air pressure, the hydraulic oil inside the oil circuit will be quickly discharged from the oil delivery pipe at the bottom, thereby shortening the oil discharge time. At the same time, when oil is injected into the housing through the oil delivery pipe, the air in the housing oil circuit can be discharged through the air inlet pipe to avoid the presence of air bubbles inside the oil circuit, thus facilitating disassembly and assembly. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the installation structure of the air guide cover of this utility model;

[0020] Figure 3 This is a schematic diagram of the shaft mounting structure of this utility model;

[0021] Figure 4 This is a schematic diagram of the tapered tube structure of this utility model;

[0022] The components are: 1. Volute; 11. Fixed pipe; 12. Connecting pipe; 13. Draft shield; 14. Sealing ring; 15. Electromagnetic bearing; 2. Housing; 21. Oil supply pipe; 22. Air inlet pipe; 23. Solenoid valve; 24. Air pump; 25. Fixing frame; 26. Rotating shaft; 27. Expansion impeller; 28. Compression impeller; 3. Connecting plate; 31. Air inlet chamber; 32. Conical pipe. Detailed Implementation

[0023] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0024] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] Please see Figure 1 - Figure 4 In this embodiment, an expander that is easy to disassemble and assemble includes: a volute 1, a fixing pipe 11 fixedly installed on the rear side of the volute 1, a connecting pipe 12 fixedly installed on the rear end of the fixing pipe 11, a flow guide 13 inserted through the inner end of the fixing pipe 11, a sealing ring 14 fixedly installed inside the flow guide 13, and an electromagnetic bearing 15 fitted into the front side of the volute 1.

[0027] The rear end of the fixed tube 11 is fixedly connected to the rear side of the volute 1, and the front end of the fixed tube 11 does not contact the inner wall of the volute 1. The connecting tube 12 is fixedly connected to the fixed tube 11 by bolts. The inner wall of the flow guide 13 is provided with an arc surface structure. The flow guide 13 is provided with a cavity. The sealing ring 14 is fixedly installed inside the cavity of the flow guide 13.

[0028] Specifically, the volute 1 facilitates the discharge of compressed gas, the fixed pipe 11 restricts the position of the connecting pipe 12 and the guide shroud 13, the guide shroud 13 facilitates the rotation of the gas-driven compression impeller 28, the sealing ring 14 prevents gas from entering the cavity of the guide shroud 13, and the electromagnetic bearing 15 reduces the friction between the compression impeller 28 and the volute 1 when the compression impeller 28 rotates.

[0029] A housing 2 is fixedly installed on the front side of the volute 1. An oil supply pipe 21 is inserted through the lower part of the housing 2. An air intake pipe 22 is inserted through the upper part of the housing 2. A solenoid valve 23 is fixedly installed above the air intake pipe 22. An air pump 24 is fixedly installed above the solenoid valve 23. A mounting bracket 25 is fixedly installed on the outside of the air pump 24. A rotating shaft 26 is movably installed in the center of the housing 2. An expansion impeller 27 is fixedly installed at the front end of the rotating shaft 26. A compression impeller 28 is fixedly installed at the rear end of the rotating shaft 26.

[0030] The housing 2 is fixedly connected to the volute 1 by bolts. The oil supply pipe 21 and the air intake pipe 22 are connected to the inner cavity of the housing 2. The rotating shaft 26 is rotatably connected to the housing 2. The expansion impeller 27 is rotatably connected to the connecting plate 3 by the electromagnetic bearing 15. The compression impeller 28 is rotatably connected to the volute 1 by the electromagnetic bearing 15. The front end of the expansion impeller 27 extends into the interior of the tapered tube 32, and the front end of the compression impeller 28 extends into the interior of the guide shroud 13.

[0031] Specifically, the housing 2 can restrict the position of the rotating shaft 26, the oil supply pipe 21 can facilitate the entry of hydraulic oil into the housing 2, the air inlet pipe 22 can facilitate the entry of gas into the housing 2, the solenoid valve 23 can seal the top of the air inlet pipe 22, the air pump 24 can restrict the position of the rotating shaft 26, the fixing bracket 25 can restrict the position of the air pump 24, the rotating shaft 26 can make the expansion impeller 27 and the compression impeller 28 rotate synchronously, the expansion impeller 27 can expand the gas volume when rotating, and the compression impeller 28 can compress the gas volume when rotating.

[0032] A connecting plate 3 is fixedly installed at the rear end of the housing 2. An air intake chamber 31 is fixedly installed on the front side of the connecting plate 3. A tapered tube 32 is fixedly installed inside the air intake chamber 31. The connecting plate 3 is fixedly connected to the housing 2 by bolts. A tubular structure communicating with the inner cavity is provided at the top of the air intake chamber 31. The inner wall of the tapered tube 32 is tapered.

[0033] Specifically, the connecting plate 3 can restrict the position of the air inlet chamber 31 and the housing 2, the air inlet chamber 31 can facilitate the gas to pass through the expansion impeller 27, and the conical tube 32 can facilitate the gas to be discharged.

[0034] In use, the expansion impeller 27 is rotatably connected to the connecting plate 3 via the electromagnetic bearing 15, and the compression impeller 28 is rotatably connected to the volute 1 via the electromagnetic bearing 15. The electromagnetic bearing 15 reduces the relative friction between the expansion impeller 27, the compression impeller 28, the connecting plate 3, and the volute 1 during rotation. Since the electromagnetic bearing 15 uses electromagnetic force to suspend the inner ring, the inner ring does not contact the outer ring during use, thus reducing wear on the electromagnetic bearing 15. This method also prevents the rotating shaft 26 from contacting the front and rear ends of the housing 2, thereby reducing wear on the rotating shaft 26 and minimizing maintenance frequency. A solenoid valve 23 is fixedly installed at the bottom of the air pump 24. The air pump 24... The solenoid valve 23 is connected to the air inlet pipe 22. When the expander is working, the solenoid valve 23 is closed and the internal oil circuit remains closed. When disassembly is required, the solenoid valve 23 is opened and air is supplied to the oil circuit of the housing 2 through the air pump 24. Since the air inlet pipe 22 is located at the top of the housing 2, the gas will accumulate at the top of the oil circuit and exert a downward force on the hydraulic oil. After being affected by the air pressure, the hydraulic oil inside the oil circuit will be quickly discharged from the oil delivery pipe 21 at the bottom, thereby shortening the oil discharge time. At the same time, when oil is injected into the housing 2 through the oil delivery pipe 21, the air in the oil circuit of the housing 2 can be discharged through the air inlet pipe 22 to avoid the presence of air bubbles inside the oil circuit, so as to facilitate disassembly and assembly.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An expander that is easy to disassemble and assemble, characterized in that, include: A volute (1) is provided, with a fixed pipe (11) fixedly installed on its rear side. A connecting pipe (12) is fixedly installed on the rear end of the fixed pipe (11). A flow guide (13) is inserted through the inner end of the fixed pipe (11). A sealing ring (14) is fixedly installed inside the flow guide (13). An electromagnetic bearing (15) is fitted into the front side of the volute (1). A housing (2) is fixedly installed on the front side of the volute (1). An oil supply pipe (21) is inserted through the lower part of the housing (2). An air intake pipe (22) is inserted through the upper part of the housing (2). The upper part of the air intake pipe (22) is... A solenoid valve (23) is fixedly installed on the housing (2). An air pump (24) is fixedly installed above the solenoid valve (23). A mounting bracket (25) is fixedly installed on the outside of the air pump (24). A rotating shaft (26) is movably installed in the center of the housing (2). An expansion impeller (27) is fixedly installed at the front end of the rotating shaft (26). A compression impeller (28) is fixedly installed at the rear end of the rotating shaft (26). A connecting plate (3) is fixedly installed at the front end of the rear end of the housing (2). An air inlet chamber (31) is fixedly installed on the front side of the connecting plate (3). A conical tube (32) is fixedly installed inside the air inlet chamber (31).

2. The expander for easy disassembly and assembly according to claim 1, characterized in that: The rear end of the fixed tube (11) is fixedly connected to the rear side of the volute (1), and the front end of the fixed tube (11) does not contact the inner wall of the volute (1).

3. An expander that is easy to disassemble and assemble according to claim 1, characterized in that: The connecting pipe (12) is fixedly connected to the fixing pipe (11) by bolts. The inner wall of the flow guide (13) is provided with an arc surface structure. The flow guide (13) has a cavity inside. The sealing ring (14) is fixedly installed inside the cavity of the flow guide (13).

4. An expander that is easy to disassemble and assemble according to claim 1, characterized in that: The housing (2) is fixedly connected to the volute (1) by bolts, and the oil pipe (21) and air inlet pipe (22) are connected to the inner cavity of the housing (2).

5. An expander that is easy to disassemble and assemble according to claim 1, characterized in that: The rotating shaft (26) is rotatably connected to the housing (2), the expansion impeller (27) is rotatably connected to the connecting plate (3) through the electromagnetic bearing (15), and the compression impeller (28) is rotatably connected to the volute (1) through the electromagnetic bearing (15).

6. An expander that is easy to disassemble and assemble according to claim 1, characterized in that: The front end of the expansion impeller (27) extends into the interior of the tapered tube (32), and the front end of the compression impeller (28) extends into the interior of the shroud (13).

7. An expander that is easy to disassemble and assemble according to claim 1, characterized in that: The connecting plate (3) is fixedly connected to the housing (2) by bolts. The top of the air inlet chamber (31) is provided with a tubular structure communicating with the inner cavity. The inner wall of the tapered tube (32) is tapered.

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