Double-shaft multistage turbine

Abstract

The application discloses a double-stretching shaft multistage turbine, and relates to the technical field of papermaking industry, which comprises a double-stretching main shaft and a driven end connecting piece, the driven end connecting piece is connected with the double-stretching main shaft on one side of the shaft axis, and the driven end connecting piece comprises an outer rotating disc coaxially connected with the one side of the shaft axis of the double-stretching main shaft. In the use process, compared with traditional two or more turbines, the double-stretching shaft turbine vacuum unit has obvious energy-saving effect, only needs to be matched with one motor, a speed increasing box and a starting cabinet, occupies smaller space, saves workshop space, and has the characteristics of stability, reliability, energy saving and high efficiency. The gas is sucked through the air inlet of the machine shell, the multistage impeller gradually pressurizes the gas, the gas can generate higher vacuum degree, the machine shell adopts the backflow device which is combined by the multi-air inlet structure, pressure expansion, backflow and air supplement, and the vacuum demand of different sections of the paper machine vacuum system is met.

Description

Technical Field

[0001] This invention relates to the technical field of the papermaking industry, specifically to a double-shaft multi-stage turbine. Background Technology

[0002] In the traditional papermaking process, the pulp is clamped by upper and lower felts, and then several rollers are used to press the pulp into shape. Since the pulp contains a lot of water, the water in the pulp will seep into the upper and lower felts during the pulp forming process. At this time, a turbine blower is needed to absorb the water in the upper and lower felts.

[0003] Currently, the vacuum systems used in the domestic papermaking industry are all turbine vacuum machines. However, the vacuum systems of medium and large paper machines require a large amount of gas and have many vacuum points. Therefore, the vacuum system needs to be equipped with multiple pieces of equipment, including at least two multi-stage turbines, as well as motors, speed increasers and starter cabinets used with the two multi-stage turbines. This results in a large amount of factory space occupied and high production and maintenance costs. Summary of the Invention

[0004] The purpose of this invention is to provide a dual-shaft multi-stage turbine to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a double-extension shaft multi-stage turbine, comprising a double-extension main shaft and a driven end connector. The driven end connector is connected to one side of the axis of the double-extension main shaft. The driven end connector includes an outer turntable coaxially connected to one side of the axis of the double-extension main shaft. A torque sensor is connected to the double-extension main shaft outside the outer turntable. A cavity is formed inside the outer turntable. Keyways are arrayed on the sidewalls of the cavity. A groove is formed at the middle of the inner wall of the cavity. An electromagnetic coil is provided with an opening inside the groove. An inner turntable is rotatably mounted inside the cavity. Elastic elements are arrayed on the inner side of the inner turntable. The inner turntable is elastically connected to the inner wall of the cavity through the elastic elements. A magnetic core is fixedly connected to the middle of the inner side of the inner turntable. Key protrusions are fixedly arrayed on the circumference of the inner turntable. Locking grooves are formed on the side of the key protrusions.

[0006] Furthermore, the keyway provided on the sidewall of the cavity is flush with the axis of the outer turntable in the length direction and has a closed structure at both ends, and the keyway is matched with the key protrusion at the corresponding position on the circumference of the inner turntable.

[0007] Furthermore, the magnetic core is magnetically engaged with the inner cavity of the electromagnetic coil, and the magnetic core is also engaged with the groove provided at the middle of the inner wall of the cavity for limiting the movement.

[0008] Furthermore, the key protrusion end plane protrudes beyond the outer plane of the inner turntable, and the key protrusion only has a locking groove on the side of the protruding portion.

[0009] Furthermore, a drive end connector is connected to the other side of the double-extension spindle axis. The drive end connector includes a half coupling that abuts against the outside of the outer turntable, and sleeves are fixedly arranged on the side of the half coupling facing the outer turntable.

[0010] Furthermore, the drive end connector also includes a centrifugal lock buckle that is slidably installed inside the sleeve, and the hook-shaped structure at the end of the centrifugal lock buckle engages with the locking groove provided on the corresponding key convex side.

[0011] Furthermore, the drive end connector also includes a spring sleeved in the middle of the centrifugal lock buckle, and the centrifugal lock buckle is elastically connected to the top opening of the sleeve through the spring.

[0012] Furthermore, a bushing assembly is fitted around the outside of the double-extension main shaft, and first-stage, second-stage, and third-stage impellers are sequentially arranged around the outside of the bushing assembly along the axial direction. A balance disc is fitted around the side of the double-extension main shaft near the third-stage impeller.

[0013] Furthermore, the dual-extension main shaft is axially positioned inside the split housing of the turbine vacuum machine, and the turbine vacuum machine is equipped with a bearing assembly that rotates with the dual-extension main shaft. A sealing assembly is also provided at the junction of the turbine vacuum machine's inner cavity and the outside.

[0014] Furthermore, one end of the second turbine vacuum machine is connected to the first turbine vacuum machine via a double-extension main shaft, and the other end of the second turbine vacuum machine is connected to a speed increaser, which is connected to the rotating end of the motor.

[0015] This invention provides a twin-shaft multi-stage turbine, which has the following beneficial effects;

[0016] 1. In the use of this invention, by integrating an electromagnetic clutch function into the driven end connector, on the one hand, when the equipment on one side of the double-extension spindle fails, the power transmission can be disconnected by the electromagnetic clutch to avoid the transmission of the fault and to balance the power distribution on both sides by temporarily disconnecting. On the other hand, the faulty side can be repaired without the entire machine being shut down, which significantly reduces downtime.

[0017] 2. In the process of using this invention, by integrating a mechanical clutch function in the half coupling, the drive end connector and the driven end connector can be automatically engaged when the preset speed is reached. Through clutch control, the motor can prioritize driving the No. 2 turbine vacuum machine with a lower load, and then engage the No. 1 turbine vacuum machine after it is running stably, thus avoiding instantaneous overload caused by starting two devices at the same time, which plays a good protective role for the motor.

[0018] 3. In the use of this invention, the dual-shaft turbine vacuum unit of this application has a significant energy-saving effect compared with traditional two or more turbine vacuum machines. It only requires one motor, speed increaser and starter cabinet, which occupies less space and saves factory space. Moreover, the dual-shaft turbine vacuum unit of this application has the characteristics of stability, reliability, energy saving and high efficiency. Gas is drawn in through the air inlet of the casing, and the multi-stage impeller pressurizes the gas step by step, so that the gas can generate a high degree of vacuum. The casing adopts a multi-inlet structure and a reflux device composed of diffusion, reflux and gas replenishment, which can generate multiple different degrees of vacuum at the same time, thereby meeting the vacuum requirements of different stages of the paper machine vacuum system. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the device of the present invention;

[0020] Figure 2 This is a schematic diagram of the turbine vacuum machine structure of the present invention;

[0021] Figure 3 This is a schematic diagram of the double-extension main shaft structure of the present invention;

[0022] Figure 4 This is a schematic diagram showing the engagement state of the drive end connector and the driven end connector of the present invention;

[0023] Figure 5 This is an exploded view of the driven end connector of the present invention;

[0024] Figure 6 This is a cross-sectional view of the driven end connector of the present invention;

[0025] Figure 7 This is a schematic diagram of the drive end connector structure of the present invention.

[0026] In the diagram: 1. Double-extension spindle; 2. Driven end connector; 201. Outer turntable; 202. Torque sensor; 203. Cavity; 204. Keyway; 205. Slot; 206. Electromagnetic coil; 207. Inner turntable; 208. Elastic element; 209. Magnetic core; 210. Key protrusion; 211. Locking groove; 3. Drive end connector; 301. Half coupling; 302. Sleeve; 303. Centrifugal lock; 304. Spring; 4. Shaft sleeve assembly; 5. Impeller; 6. Balance disc; 7. Turbine vacuum machine; 8. Bearing assembly; 9. Sealing assembly; 10. Speed ​​increaser; 11. Motor. Detailed Implementation

[0027] The embodiments of the present invention 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 the invention.

[0028] Please see Figures 4 to 6This invention provides a technical solution: a double-extension shaft multi-stage turbine, including a double-extension main shaft 1 and a driven end connector 2. The driven end connector 2 is connected to one side of the axis of the double-extension main shaft 1. The driven end connector 2 includes an outer turntable 201 coaxially connected to one side of the axis of the double-extension main shaft 1. A torque sensor 202 is connected to the double-extension main shaft 1 outside the outer turntable 201. A cavity 203 is formed inside the outer turntable 201. Keyways 204 are arrayed on the sidewall of the cavity 203. A groove 205 is formed in the middle of the inner wall of the cavity 203. An electromagnetic coil 206 is provided in the inner opening of the groove 205. An inner turntable 207 is rotatably mounted inside the cavity 203. Elastic elements 208 are arrayed on the inner side of the inner turntable 207. The inner turntable 207 is connected to the inner turntable by the elastic element 208. The sexual component 208 is elastically connected to the inner wall of the cavity 203. A magnetic core 209 is fixedly connected to the middle of the inner side of the inner turntable 207. A key protrusion 210 is fixed in a circumferential array on the inner turntable 207. A locking groove 211 is opened on the side of the key protrusion 210. The length direction of the key groove 204 on the side wall of the cavity 203 is flush with the axis of the outer turntable 201 and the two ends are closed. The key groove 204 is limited and matched with the key protrusion 210 at the corresponding position on the circumference of the inner turntable 207. The magnetic core 209 is magnetically matched with the inner cavity of the electromagnetic coil 206. The magnetic core 209 is limited and matched with the groove 205 at the middle of the inner wall of the cavity 203. The end plane of the key protrusion 210 protrudes out of the outer plane of the inner turntable 207. The key protrusion 210 is only provided with a locking groove 211 on the side of the protruding part.

[0029] The specific operation is as follows: In this application, a torque sensor 202 is provided on one side of the driven end connector 2 of the double-extension spindle 1. When the torque sensor 202 senses that a fault has occurred in the turbine vacuum machine 7 or drive equipment connected to one side of the double-extension spindle 1, resulting in abnormal rotation speed, the electromagnetic coil 206 on the inner wall of the corresponding shaft end outer turntable 201 is energized to generate magnetic force. Through the attraction of the electromagnetic coil 206 to the built-in magnetic core 209, the inner turntable 207 is pulled away from the half coupling 301, thereby causing the centrifugal lock 303 to disengage from the inner turntable 207. The engagement of the locking groove 211 provided on the 07 circumferential key protrusion 210 quickly cuts off the power transmission between the drive end connector 3 and the driven end connector 2, preventing the fault from spreading to the other side of the equipment. This application integrates an electromagnetic clutch function in the driven end connector 2. On the one hand, when the equipment on one side of the double extension spindle 1 fails, the power transmission can be disconnected by the electromagnetic clutch to prevent the fault from spreading and to balance the power distribution on both sides by temporarily disconnecting. On the other hand, the faulty side can be repaired without stopping the entire machine, which significantly reduces downtime.

[0030] Please see Figure 7The other side of the axis of the double-extension spindle 1 is connected to a drive end connector 3. The drive end connector 3 includes a half coupling 301 that is mated to the outside of the outer turntable 201. A sleeve 302 is fixedly arranged on the side of the half coupling 301 facing the outer turntable 201. The drive end connector 3 also includes a centrifugal lock buckle 303 that is slidably installed inside the sleeve 302. The hook-shaped structure at the end of the centrifugal lock buckle 303 engages with the locking groove 211 provided on the side of the corresponding key protrusion 210. The drive end connector 3 also includes a spring 304 sleeved in the middle of the centrifugal lock buckle 303. The centrifugal lock buckle 303 is elastically connected to the top opening of the sleeve 302 through the spring 304.

[0031] The specific operation is as follows: During the startup process of motor 11, the voltage and current are gradually increased to smoothly accelerate motor 11 from a stationary state to the rated speed. As the speed increases, the centrifugal locking buckle 303 of the drive end connector 3 on the speed increaser 10 disengages from the sleeve 302 under the action of gradually increasing centrifugal force and engages with the locking groove 211 on the side of the circumferential key protrusion 210 of the inner turntable 207. This causes the half coupling 301 on the speed increaser 10 to rotate and drive the inner turntable 207 through the engagement of the centrifugal locking buckle 303 and the key protrusion 210. Furthermore, the inner turntable 207 is limited by the key groove 204 on the side wall of the outer turntable 201 through the limiting engagement of the circumferential key protrusion 210. The outer turntable 201 drives the second through-shaft equipped with a double-extension main shaft 1. When the flat vacuum machine 7 starts, similarly, when the double-extension spindle 1 inside the second turbine vacuum machine 7 reaches the rated speed, the drive end connector 3 on the side of the double-extension spindle 1 near the first turbine vacuum machine 7 engages with the driven end connector 2 at the shaft end of the first turbine vacuum machine 7, thereby driving the first turbine vacuum machine 7 to start. This application integrates a mechanical clutch function in the half-coupling 301, which can automatically engage the drive end connector 3 and the driven end connector 2 when the preset speed is reached. Through clutch control, the motor 11 can prioritize driving the second turbine vacuum machine 7 with a lower load, and engage the first turbine vacuum machine 7 after it is running stably, avoiding instantaneous overload caused by starting two devices at the same time, and playing a good protective role for the motor 11.

[0032] Please see Figures 1 to 3 The double-extension main shaft 1 is fitted with a bushing assembly 4, and the bushing assembly 4 is provided with first-stage, second-stage and third-stage impellers 5 in sequence along the axial direction. The double-extension main shaft 1 is fitted with a balance disc 6 on the side near the third-stage impeller 5. The double-extension main shaft 1 is axially located inside the split housing of the turbine vacuum machine 7. The turbine vacuum machine 7 is provided with a bearing assembly 8 that rotates with the double-extension main shaft 1. A sealing assembly 9 is provided at the junction of the inner cavity of the turbine vacuum machine 7 and the outside. One end of the second turbine vacuum machine 7 is connected to the first turbine vacuum machine 7 through the double-extension main shaft 1. The other end of the second turbine vacuum machine 7 is connected to a speed increaser 10, and the speed increaser 10 is connected to the rotating end of the motor 11.

[0033] The specific operation is as follows: The No. 2 turbine vacuum machine 7 adopts a double-shaft structure. One end of the main shaft is connected to the speed increaser 10 via a coupling. The speed increaser 10 is connected to the motor 11. The other end of the main shaft is connected to the main shaft of the No. 1 turbine vacuum machine 7 via a coupling. When the motor 11 runs, the speed increaser 10 increases the speed, driving the No. 2 turbine vacuum machine. The No. 2 turbine vacuum machine then drives the No. 1 turbine vacuum machine 7. This unit only requires one speed increaser 10, whereas traditionally, two or more turbine vacuum machines 7 require at least two or more speed increasers 10. The speed increasers 10 themselves have power consumption losses; the more speed increasers, the greater the transmission loss, making this application... Compared with traditional two or more turbine vacuum machines, the 7-unit double-shaft turbine vacuum machine has a significant energy-saving effect. It only requires one motor 11, speed increaser 10 and starter cabinet, occupying less space and saving factory space. Moreover, the 7-unit double-shaft turbine vacuum machine of this application is stable, reliable, energy-saving and efficient. Gas is drawn in through the air inlet of the machine casing, and the multi-stage impeller 5 pressurizes the gas step by step, so that the gas can generate a high vacuum degree. The machine casing adopts a multi-inlet structure and a reflux device composed of diffusion, reflux and gas replenishment, which can generate multiple different vacuum degrees at the same time, thereby meeting the vacuum requirements of different stages of the paper machine vacuum system.

[0034] In summary, when using this twin-shaft multistage turbine:

[0035] First, the No. 2 turbine vacuum machine 7 adopts a double-shaft structure. One end of the main shaft is connected to the speed increaser 10 via a coupling, and the speed increaser 10 is connected to the motor 11. The other end of the main shaft is connected to the main shaft of the No. 1 turbine vacuum machine 7 via a coupling. When the motor 11 is running, the speed increaser 10 increases the speed, which then drives the No. 2 turbine vacuum machine. The No. 2 turbine vacuum machine then drives the No. 1 turbine vacuum machine 7. The unit only needs one speed increaser 10, while traditionally, two or more turbine vacuum machines 7 are equipped with at least two or more speed increasers 10. The speed increasers 10 themselves have power loss, and the more speed increasers there are, the greater the transmission loss. This makes the double-shaft structure of this application more efficient. Compared with traditional two or more turbine vacuum machines, the 7-unit extended shaft turbine vacuum machine has a significant energy-saving effect. It only requires one motor 11, speed increaser 10 and starter cabinet, which occupies less space and saves factory space. Moreover, the 7-unit extended shaft turbine vacuum machine of this application has the characteristics of stability, reliability, energy saving and high efficiency. Gas is drawn in through the air inlet of the machine casing, and the multi-stage impeller 5 pressurizes the gas step by step, so that the gas can generate a high vacuum degree. The machine casing adopts a multi-inlet structure and a reflux device composed of diffusion, reflux and gas replenishment, which can generate multiple different vacuum degrees at the same time, thereby meeting the vacuum requirements of different stages of the paper machine vacuum system.

[0036] Secondly, during the startup process of motor 11, the voltage and current are gradually increased to smoothly accelerate motor 11 from a standstill to its rated speed. As the speed increases, the centrifugal locking buckle 303 of the drive end connector 3 on the speed increaser 10 disengages from the sleeve 302 under the gradually increasing centrifugal force and engages with the locking groove 211 on the side of the circumferential key protrusion 210 of the inner turntable 207. This causes the half-coupling 301 on the speed increaser 10 to rotate and drive the inner turntable 207 through the engagement of the centrifugal locking buckle 303 and the key protrusion 210. Furthermore, the inner turntable 207, through the limiting engagement of the circumferential key protrusion 210 and the keyway 204 on the side wall of the outer turntable 201, drives the No. 2 turbine equipped with a double-extension main shaft 1 through the outer turntable 201. When the empty machine 7 starts, similarly, when the double-extension main shaft 1 in the second turbine vacuum machine 7 reaches the rated speed, the drive end connector 3 on the side of the double-extension main shaft 1 near the first turbine vacuum machine 7 engages with the driven end connector 2 at the shaft end of the first turbine vacuum machine 7, thereby driving the first turbine vacuum machine 7 to start. This application integrates a mechanical clutch function in the half coupling 301, which can automatically engage the drive end connector 3 and the driven end connector 2 when the preset speed is reached. Through clutch control, the motor 11 can prioritize driving the second turbine vacuum machine 7 with a lower load, and engage the first turbine vacuum machine 7 after it is running stably, avoiding instantaneous overload caused by starting two devices at the same time, and playing a good protective role for the motor 11.

[0037] Finally, this application provides a torque sensor 202 on one side of the driven end connector 2 of the double-extension spindle 1. When the torque sensor 202 senses a malfunction in the turbine vacuum machine 7 or drive equipment connected to one side of the double-extension spindle 1, causing abnormal rotation speed, the electromagnetic coil 206 on the inner wall of the corresponding shaft end outer turntable 201 is energized to generate magnetic force. Through the attraction of the electromagnetic coil 206 to the built-in magnetic core 209, the inner turntable 207 is pulled away from the half coupling 301, thereby causing the centrifugal lock 303 to disengage from the inner turntable 207. The engagement of the locking groove 211 provided on the circumferential key protrusion 210 quickly cuts off the power transmission between the drive end connector 3 and the driven end connector 2, preventing the fault from spreading to the other side of the equipment. This application integrates an electromagnetic clutch function in the driven end connector 2. On the one hand, when the equipment on one side of the double extension spindle 1 fails, the power transmission can be disconnected by the electromagnetic clutch to prevent the fault from spreading and to balance the power distribution on both sides by temporarily disconnecting. On the other hand, the faulty side can be repaired without stopping the entire machine, which significantly reduces downtime.

[0038] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0039] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. A double-extension-shaft multi-stage turbine, comprising a double-extension main shaft (1) and a driven end connector (2), characterized in that, A driven end connector (2) is connected to one side of the axis of the double-extension spindle (1). The driven end connector (2) includes an outer turntable (201) coaxially connected to one side of the axis of the double-extension spindle (1). A torque sensor (202) is connected to the double-extension spindle (1) outside the outer turntable (201). A cavity (203) is provided inside the outer turntable (201). Keyways (204) are arrayed on the sidewall of the cavity (203). A groove (204) is provided in the middle of the inner wall of the cavity (203). 5), and an electromagnetic coil (206) is provided in the inner opening of the groove (205). An inner turntable (207) is rotatably installed inside the cavity (203), and elastic elements (208) are arranged in an array on the inner side of the inner turntable (207). The inner turntable (207) is elastically connected to the inner wall of the cavity (203) through the elastic elements (208). A magnetic core (209) is fixedly connected to the middle of the inner side of the inner turntable (207), and key protrusions (210) are fixed in an array around the inner turntable (207). Furthermore, a locking groove (211) is provided on the side of the key protrusion (210), and the end plane of the key protrusion (210) protrudes beyond the outer plane of the inner turntable (207). The key protrusion (210) is only provided with a locking groove (211) on the side of the protruding part. A drive end connector (3) is connected to the other side of the axis of the double-extension spindle (1). The drive end connector (3) includes a half coupling (301) that abuts against the outside of the outer turntable (201), and the half coupling (301) faces the side of the outer turntable (201). The array is fixed with a sleeve (302). The drive end connector (3) also includes a centrifugal lock buckle (303) that is slidably installed inside the sleeve (302). The hook-shaped structure at the end of the centrifugal lock buckle (303) engages with the locking groove (211) on the side of the corresponding key protrusion (210). The drive end connector (3) also includes a spring (304) sleeved in the middle of the centrifugal lock buckle (303). The centrifugal lock buckle (303) is elastically connected to the top opening of the sleeve (302) through the spring (304).

2. The twin-shaft multi-stage turbine according to claim 1, characterized in that, The keyway (204) provided on the side wall of the cavity (203) is flush with the axis of the outer turntable (201) in the length direction and has a closed structure at both ends. The keyway (204) is matched with the key protrusion (210) at the corresponding position on the circumference of the inner turntable (207).

3. A twin-shaft multi-stage turbine according to claim 2, characterized in that, The magnetic core (209) is magnetically engaged with the inner cavity of the electromagnetic coil (206), and the magnetic core (209) is limited by the groove (205) provided at the middle of the inner wall of the cavity (203).

4. A twin-shaft multi-stage turbine according to claim 1, characterized in that, The double-extension main shaft (1) is fitted with a bushing assembly (4), and the bushing assembly (4) is provided with first-stage, second-stage and third-stage impellers (5) in sequence along the axial direction. The double-extension main shaft (1) is fitted with a balance disc (6) on the side adjacent to the third-stage impeller (5).

5. A twin-shaft multi-stage turbine according to claim 1, characterized in that, The double-extension main shaft (1) is axially arranged inside the split housing of the turbine vacuum machine (7), and the turbine vacuum machine (7) is provided with a bearing assembly (8) that rotates with the double-extension main shaft (1), and a sealing assembly (9) is provided at the junction of the inner cavity of the turbine vacuum machine (7) and the outside.

6. A twin-shaft multi-stage turbine according to claim 5, characterized in that, One end of the No. 2 turbine vacuum machine (7) is connected to the No. 1 turbine vacuum machine (7) via a double-extension main shaft (1), and the other end of the No. 2 turbine vacuum machine (7) is connected to a speed increaser (10), and the speed increaser (10) is connected to the rotating end of the motor (11).

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