WO2008138226A1

WO2008138226A1 - Screw energy converter

Info

Publication number: WO2008138226A1
Application number: PCT/CN2008/000940
Authority: WO
Inventors: Chenglin Wu; Zheng Wu; Qin Wu; Yunxuan Wu
Original assignee: Chenglin Wu; Zheng Wu; Qin Wu; Yunxuan Wu
Priority date: 2007-05-14
Filing date: 2008-05-14
Publication date: 2008-11-20
Also published as: CN101307674B; CN101307674A

Abstract

A screw energy converter has a stator (300) and a rotor. Said stator (300) includes a housing (303) and a elastic stator core (308) made of soft and elastic material. The outer wall of the stator core (308) has a shape of cylinder that matches the shape of the chamber of the housing (303). The inner wall of the stator core (308) is a double-thread or multiple-thread screw chamber that matches said rotor. Said stator core (308) is fixed into the chamber of the housing (303) axially and peripherally. An inner tube (306) made of soft and elastic material is provided in the gap between the stator core (308) and the housing (303), and the tube (306) rings the outer wall of the stator core (308). The inner tube (306) has mud entrances. There are joints (310) provided on the entrances. Also, the side wall of the stator core (308) has mud entrances and these entrances are provided with joints (307) which communicate with the joints (310) of the inner tube through pipes (309). Through the expansion of the inner tube (306), it is possible to prevent the wear of the stator (300) and the gap from expanding due to the reduction of the stator core (308) when the pressure is increased, so that a high capacity efficiency can be maintained for a long time.

Description

Spiral transducer equipment

The invention provides a spiral translating power device, in particular to a long life spiral transducing device.

Background technique

The spiral transducing device mainly comprises a stator and a rotor, the stator is a cylinder, the cylinder is a spiral cavity with two heads or several heads, and the rotor is a single-head or several-head spiral steel shaft. The screw transducing device can be a screw booster, a screw pump, or a screw drill.

High-pressure jet drilling tools can significantly increase the speed of the drilling, but to achieve higher drilling speeds, high-pressure mud is required. There are two ways to increase the mud pressure to achieve high-pressure jet drilling. One is to increase the pump pressure of the ground mud pump. However, due to the mud reaching the bit nozzle, the pressure drop along the way is too large, which makes the drilling efficiency low. Second, when the mud is mud A supercharger is added from the inside of the drill pipe to the bit nozzle, and the power of the supercharger comes from the energy of the drill pipe. FIG. 1 is a schematic structural view of a nano-drilling tool with a spiral transducing device in the prior art, which is provided with a transducer composed of a stator 1 and a rotor 2, and an upper end of the stator and a bypass valve Connected, the lower end of the rotor is connected to the drill bit 7 through the universal joint 3 bearing 5 and the drive joint 6, and the mud is introduced into the spiral chamber of the stator from the upper bypass width 8, and the mud pressure energy is changed by the rotor into mechanical energy for driving the drill bit to rotate. The centralizer 4 plays the role of strengthening the drill.

The screw drill belongs to the downhole power drilling tool, which is mainly used for drilling directional wells and drilling hydraulic plugs after oil testing. The screw pump is used for underground oil and gas mixed mining of oil wells and ground oil and gas mixed transportation.

The screw pump is a general-purpose device whose structural principle is basically the same as that of the aforementioned screw supercharger and screw drill.

The structure of the prior art spiral transducing device is generally as follows: as shown in FIG. 2 and FIG. 3, FIG. 3a and FIG. 3b, the stator 1 is a processed steel cylinder, and the inner wall of the vulcanized layer has a double-headed or multi-headed spiral cavity. Steel body rubber sleeve 1 1. The rotor 2 is a spiral steel shaft machined into a single or multi-headed alloy steel, and a rubber sleeve 1 1 of a spiral cavity in the stator cylinder mainly serves as a sealing function. After using the spiral transducing device of this structure for a period of time, the rotor and the stator have wear problems, the gap between them is increased, the volumetric efficiency is lowered, and even the working ability is lost. More importantly, when the liquid pressure rises, the stator core is compressed, the stator and the sealing gap with the rotor are increased, and the screw drill speed is decreased.

Summary of the invention

SUMMARY OF THE INVENTION An object of the present invention is to improve the deficiencies in the prior art by providing a long life spiral transducing device which does not cause an increase in the gap between the stator and the rotor due to wear and compression of the stator core.

The object of the invention is achieved in this way:

The long life spiral transducing device provided by the invention comprises a stator and a rotor.

The rotor is a single or multi-headed spiral steel shaft;

The stator includes an outer cylinder and an elastic stator core made of a soft elastic material, The outer wall of the stator core is a cylindrical shape matching the shape of the outer cylinder cavity, and the inner wall of the stator core is a double or multi-head spiral chamber matched with the rotor, and the stator core is axially And circumferentially fixedly disposed in the outer cylinder chamber, and an annular hollow inner tube which is also made of a soft elastic material is disposed in the annular gap between the stator rubber core and the outer cylinder, and is sleeved on the stator On the outer wall of the rubber core, the inner tube is provided with a slurry inlet and outlet, a tube joint is arranged on the mud inlet and outlet, and a mud inlet and outlet is also arranged on the side wall of the stator rubber core, and a joint is arranged thereon. The joint between the joint and the inner tube joint is connected by a conduit.

The inner tube may be disposed on the outer wall of the longitudinal direction of the stator rubber core, each inner tube is fixed on an outer wall of the stator rubber core, and the stator core is corresponding to each inner tube The slurry inlet and outlet is provided with the joint, and is connected to the inner tube joint on the corresponding inner tube through a conduit.

Preferably, the plurality of inner tubes are evenly distributed along the length of the stator core.

In order to facilitate the disassembly and assembly, the outer cylinder comprises a casing and a split inner cylinder. The split inner cylinder is equally divided in the circumferential direction, and is divided into at least two halves, and the respective petals are closed and fixed to the stator rubber core.

The axial and circumferential fixing structure between the split inner cylinder and the stator rubber core may be: a plurality of blocking rings are fixed on the inner wall of the split inner cylinder, and are inserted on the outer circumferential wall of the stator rubber core. The annular groove is disposed in the position to form an axial fixing structure, and a plurality of protrusions are arranged on the end of the blocking ring in the circumferential direction, and are embedded in the wall of the stator core to form a circumferential fixing structure.

The long life spiral transducing device may be a screw supercharger including the stator and the rotor, and further comprising a speed increaser, the speed increaser comprising an input shaft and an output shaft, the input The shaft is connected to the power unit in use, for example, when it is applied on a well, the upper drill string is connected to the drill shaft, the output shaft is connected to the rotor, and the input shaft and the output shaft are connected by a speed increasing transmission mechanism.

Preferably, the speed increasing transmission mechanism is a wheel train, the input shaft is a circular section cylinder body, and an inner gear is disposed on an inner wall thereof, and a support frame is further disposed on the inner wall of the cylinder body, wherein the support frame is located in the cylinder body The center is provided with a bearing, and the outer ring of the bearing is connected with a tie rod. The tie rod is rotatably connected to the planetary gear, and the inner ring of the bearing is connected to the central shaft. The shaft is provided with a sun gear, and the planetary gear is respectively coupled with the inner gear and the sun. The gear combination constitutes the train wheel, and the shaft on which the sun gear is located is the output shaft, which is connected to the rotor of the screw booster through a universal joint.

At this time the stator is stationary. It can also be rotated and its steering is opposite to the rotor steering.

The long-life spiral transducing device can also be a screw pump. As in the prior art, the stator is connected to the frame, and the stator is provided with a fluid suction port and a pressure outlet, and the rotor is connected to the power transmission device.

The long life spiral transducing device can also be a screw drill in which the end of the rotor is coupled to the drill bit via a cardan shaft and a drive shaft.

The technology adopts a screw supercharger, and has a simple structure and a hydraulic sealing device to prolong the service life of the stator and meet the technical requirements of high-pressure jet drilling.

The spiral transducing device provided by the invention has the following advantages, - 1. As the working time increases, the contact between the rotor and the stator is subject to wear, and the fluid pressure compresses the stator core, so that the sealing gap between the stator and the rotor is increased, but the pressure difference between the inner tube and the inner wall of the corresponding stator core It is immediately so that it can expand the inner tube in time to make up for the gap caused by the above reasons and maintain high volumetric efficiency for a long time.

2. Extend the service life of the stator core.

3. When manufacturing new equipment, it is not necessary to have excessive contact between the stator and the rotor to reduce the starting resistance.

DRAWINGS

The invention will now be further described with reference to the accompanying drawings.

1 is a schematic view showing the structure of a nano-drill with a spiral transducer in the prior art.

2 is a schematic structural view of a single-head spiral transducer in a conventional screw booster device;

3 is a schematic structural view of a multi-head helical transducer in a conventional spiral supercharging device;

Figure 3a is a schematic structural view of the transducer device shown in Figure 3;

Figure 3b is a top plan view of Figure 3a;

Figure 4 is a schematic view of a conventional screw pump unit;

FIG. 5 is a schematic structural view of a stator of a spiral transducing device according to the present invention; FIG.

Figure 5a is a schematic cross-sectional view of the A-A of Figure 5;

6 is a schematic structural view of a screw supercharger with a speed increaser provided by the present invention;

Fig. 6A is a schematic cross-sectional view of the B-B of Fig. 6.

detailed description

As shown in Figures 5 and 5a, the long life spiral transducing device provided by the present invention comprises a stator 300 and a rotor (not shown in the figure).

The rotor is a single or multi-headed spiral steel shaft;

The stator 300 includes an outer cylinder including a casing 302 and a split inner cylinder 303. The split inner cylinder 303 is equally divided in the circumferential direction and is divided into three equal parts, and further includes a soft elastic An elastic stator core 308 made of material, the outer wall of the stator core 308 is in a cylindrical shape matching the shape of the cavity of the split inner cylinder 303, and the inner wall of the stator core 308 is double or multi-head matched with the rotor. In the spiral chamber, the number of stator spiral heads is always larger than the number of rotor spiral heads. Usually, the number of stator heads is odd, and the number of stator spiral heads is even. The stator rubber core 308 is fixedly disposed in the outer cylinder chamber in the axial direction and the circumferential direction. In the embodiment, the petals of the split inner cylinder 303 are closed and fixed to the stator rubber core.

An annular hollow inner tube 306, which is also made of a soft elastic material, is provided in the annular gap between the stator rubber core 308 and the split inner cylinder 303. The longitudinal section of the inner tube 306 has a smooth transitional rectangular cavity, and the cross-section tail hollow ring Cavity. The sleeve 306 is disposed on the outer wall of the stator rubber core 308. The inner tube 306 is provided with a mud raft outlet, and the inner tube joint 310 is disposed on the inlet and outlet of the mud hopper, and the mud inlet and outlet are also disposed on the side wall of the stator rubber core 308. A joint 307 is provided thereon, and the joint 307 and the inner tube head 310 are connected by a conduit 309.

The inner tube 306 may be provided on the outer wall of the longitudinal direction of the stator core 308, each inner tube Fixed on the outer wall of the stator rubber core, each inner sleeve is disposed on the outer wall of the stator rubber core, and may be installed by first placing the inner tube on a predetermined position on the outer wall of the stator rubber core, and then using the conduit to connect the stator rubber core joint The inner tube joint is connected, and then the split inner cylinder 303 is mounted on the stator core (the stator core is supported by a round bar), and then the closed split inner cylinder is placed in the stator outer casing 302. in. The slurry inlet and outlet are provided on the stator core corresponding to each inner tube, and the joint is provided thereon, and the inner tube joint on the corresponding inner tube is connected through the tube.

A plurality of inner tubes disposed in the axial direction of the stator core, and a tube on the inner tube. One end of the conduit is connected to the high pressure joint of the stator core and the other end is connected to the joint between the adjacent inner tube and the inner tube. The purpose is to achieve the inner tube expansion and compression of the stator core to seal it to the required pressure difference.

Due to spiral transducing equipment, such as screw pumps, the inlet pressure is low, the outlet pressure is high, and the pressure is linearly distributed. The pressure in the direction in which the stator core pressure is raised is introduced from the conduit into the inner cavity corresponding to the low pressure point of the stator core. In this way, the inner tube can be expanded, and the stator rubber core can be compressed to achieve the purpose of sealing.

The axial and circumferential fixing structure between the split inner cylinder and the stator core may be: a plurality of blocking rings 304 are fixed on the inner wall of the split inner cylinder, and one end of the preventing ring 304 is welded to the split inner cylinder 303. The inner wall, the other end of which is inserted into the annular groove disposed at the corresponding position on the outer circumferential wall of the stator rubber core 308 to form an axial fixed structure, and the split inner cylinder 303 is divided into two equal parts or three equal parts or more. The splitting is formed to prevent the ring 304 from being welded with a small stop 305 for preventing the helical cavity stator core 308 from rotating circumferentially.

The joint 307 is disposed at the inner wall of the spiral cavity of the stator core 308, and a mesh is provided in the joint 307 to prevent mechanical impurities from entering the conduit 309 to cause blockage. The conduit 309 connects the joint 307 and the inner tube joint 310. Each of the conduits 309 communicates the tire joint 310 along the pressure increasing direction with a joint 307 on the stator core 308 that corresponds to one or more of the retaining rings. When the screw booster is in operation, each inner tube 306 is in operation. When the liquid pressure is equal to or greater than the sum of the pressure in the rubber sleeve of the stator core 308 corresponding to the inner tube and the resistance of the extruded rubber sleeve, the rubber sleeve shrinks and contracts against the outer wall of the rotor screw to minimize the volume loss. Since the above pressure difference is random, the volumetric efficiency will be high until the rubber sleeve is completely worn and cannot be used. From this, it can be seen that the present invention not only improves work efficiency, but also increases the service life of the screw screw device. In Fig. 5, only a schematic diagram of a catheter connected to a stator core joint and a tube joint is shown, and so on.

Regarding the stator hydraulic seals of the screw drill and the screw pump, the principle structure is basically the same, and will not be described here. The two ends of the stator rubber core 308 are fixed to the outer casing and the split inner cylinder through the locking joint and the bushing. Specifically, the locking joint 301 is a cylinder having a stepped hole, and the inner wall of the large and small hole section has an inner wall. In the threaded section, the bushing 31 1 is a cylindrical body whose inner hole is a stepped shape of the outer wall of the straight hole wall, and external threads are provided on the large end and the small end outer wall of the stepped outer wall. When fitting, the end of the outer casing 302 and the split inner cylinder abut against the shoulder between the large and small holes of the locking joint 301, and the internal thread on the inner wall of the large hole of the locking joint corresponds to the outer casing The external thread is matched with the screw, and the stator core 308 is inserted into the small hole end from the large hole end of the locking joint, and is inserted on the outer wall shoulder of the bushing 311 which is inserted into the locking joint 301 from the small end of the locking joint. The external thread of the big end of the bushing 311 is matched with the internal thread of the small hole section of the locking joint, and the external thread of the small end of the bushing 311 is screwed into the end of the stator core. The large end of the bushing 311 is provided with a cross opening for screwing in with a proprietary tool. The externally threaded bushing 311 is screwed into the two ends of the stator core for fastening purposes to ensure that no leakage is allowed during operation. A locking joint 301 is fixed to both ends of the above-mentioned transducer device to prevent the split inner cylinder 303 from loosening during operation.

The number of flaps of the split inner cylinder 303 is preferably a small flap on the premise of facilitating the mounting of the stator core 308. A screw booster can be formed by using a screw transducing device as shown in FIG. The locking joint 301 is connected with the outer casing 302 of the supercharger, that is, the outer casing 302 by a sealing thread, and the inner step thereof should be tightened to the end of the split inner cylinder 303 to prevent axial splitting and circumference of the split inner cylinder 303 during operation. Turn to the direction. The locking joints 301 are respectively connected to the other components above and below.

The spiral transducing device shown in FIG. 5 is used for high-pressure jet drilling, and a supercharger is added to the flow path before the bit nozzle, and the supercharger is the aforementioned screw supercharger;

The screw booster can also include a speed increaser. Thus, as shown in Figures 6 and 6a, the high-pressure jet drilling equipment includes four parts from top to bottom. The first part is the upper drill string part I of the high-pressure injection drilling, the second part is the gear speed increaser II, and the third part is the screw. Supercharger III, the fourth part is the lower drill string structure IV of high pressure jet drilling. The speed increaser includes an input shaft coupled to the upper drill string and an output shaft coupled to the rotor of the supercharger.

The rotor of the supercharger is coupled to an output shaft of the speed increaser, which is a screw, the inner wall of which is provided with a thread matching the screw, and the rotor is placed in the stator.

As shown in Fig. 6, the gear speed increaser utilizes a part of the power of the drill rod to rotate in the rotary drilling as the power of the gear increaser. The gear speed increaser is the secondary gear speed increasing, the first stage increasing speed is composed of the inner gear 505 of the speed increaser housing 512 and the meshing outer gear 506; the second stage increasing speed is the outer gear of the planetary gear 506 and the sun The outer wheel gear 508 is composed of. The gears 506, 508 are secured to the brackets 501, 509 by bearings 504, 511, which in turn are secured to the speed increaser housing 512. The speed increaser housing 512 is connected to the drill string through a pipe thread.

The internal gear 505 is machined on the inner wall of the cylinder that rotates simultaneously with the drill rod. The internal gear 505 rotates at the same speed as the drill rod, and the rotation of the internal gear 505 drives the three planetary external gears 506 mounted on the carrier 503 in the same direction. Rotating, the carrier 503 is mounted on the support frame 501 by a bearing 501. The support frame 501 is composed of three support rods distributed at equal angles on the circumference. The support rod is welded on the inner wall of the work cylinder of the gear speed increaser, and the connection point is Point 502.

When the planetary gear 506 rotates, the outer gear 508 of the sun gear is driven to rotate in the opposite direction. The sun gear 508 is mounted on the central shaft 513. The central shaft 513 is mounted on the support frame 509 through the bearing 511. The structure and support of the support frame 509 are supported. The structure of the frame 501 is basically the same, and the same three support rods pass through the solder joints, 510 It is fixed on the inner wall of the work cylinder of the gear speed increaser π.

As can be seen from the above, a part of the power of the drill rod rotation is transmitted to the center shaft 513 through the gear speed increaser, and is transmitted from the center shaft 513 to the screw supercharger through the universal joint or the flexible shaft 10. At the same time, the direction of rotation of the central axis is opposite to the direction of rotation of the drill pipe, and the direction of rotation of the stator is the same as the direction of rotation of the drill pipe. Thus, it can be seen that the rotation direction of the stator and the rotor is opposite, which is required for the operation of the screw supercharger. of. The planetary frame 503 is opposite to the direction in which the planet gears 506 rotate.

(1) The working principle of the gear speed increaser:

When the ground driller drives the drill rod to rotate, the drill rod rotates to drive the speed increaser housing 512 to rotate, and the speed increaser outer casing 512 drives the gears 506, 508 and the planet carrier 503 to rotate by the internal gear 505, thereby driving the central shaft 513 to rotate.

Since the large gears drive the pinion rotation in the above structure, the purpose of the second-stage speed increase is achieved. As can be seen from the above figures, the direction of rotation of the gear speed increaser central shaft 513 is opposite to the direction of rotation of the drill pipe.

(2) Structure and principle of screw supercharger:

The structure and working principle of the screw supercharger are the same as those of the screw pump, and the working principle is the same. The screw pump has the same structure as the motor assembly of the screw drill. The difference is that when the drill pipe rotates as the power, it is a screw supercharger; when the high pressure mud is used as the power, it is the motor of the screw drill.

(3) The principle of extending the life of the screw supercharger:

The main working components of the downhole screw drilling tool, the downhole screw supercharger, the ground screw pump, and the downhole electric screw pump are composed of a stator and a rotor. The life of the stator and rotor determines the life of the entire equipment. This technology primarily addresses the working life of the stator. As shown in Fig. 2, in the past, the stator was vulcanized in a machined steel cylinder with a steel rubber sleeve having a double-headed or multi-headed spiral cavity. The disadvantage of this type of stator is that it wears up with the rotor (from a single steel or a single-headed spiral steel shaft), which gradually reduces the volumetric efficiency and ultimately deprives the equipment of its usefulness.

In short, when the ground mud pump pumps the mud to the screw supercharger, the friction is greatly consumed due to the friction along the way. Only after the supercharged by the screw supercharger can the well bottom high-pressure jet drilling be formed, and the drilling speed is greatly improved. Reduce drilling costs.

For downhole power screw drilling, the use of hydraulically sealed stators improves efficiency and longevity, and reduces the number of trips, which is significant for directional wells to reduce drilling costs.

The invention has the stator rubber core as a whole and is not in contact with the inner wall of the outer cylinder of the stator, and has a proper gap, and is divided into several equal parts in the longitudinal direction of the gap, and a cylindrical sleeve inner tube is installed in each aliquot gap. The inner tube is connected to the inner wall of the stator by a tube and the inner cavity of the stator in the direction of increasing pressure by one or a plurality of inner tubes. The inner ring of the inner tube is separated by a metal ring sheet, that is, the ring 504 is blocked. The 504 is fixed to the inner wall of the split inner cylinder 303.

The sealing principle of the inner tube structure in the operation of the spiral transducer is: when the mud pressure in the inner tube cavity is greater than the sum of the mud pressure at the inner wall of the corresponding stator core and the inward reducing resistance of the stator core, the inner tube is radially Inward expansion causes the stator core to shrink into close contact with the rotor, minimizing leakage. The purpose of the foregoing inner tube and the inner cavity of the stator being connected to the inner wall of the stator corresponding to one or several inner tubes in the direction of increasing pressure is to obtain the resultant pressure difference of the contraction of the stator core. The pressure difference is too large, the tighter the stator and rotor contact, the better the seal, but the rotor rotation resistance is increased; conversely, the pressure difference is too small, the seal is worse, the volumetric efficiency is low, so there should be a reasonable pressure difference.

Figure 4 shows a screw pump unit of the prior art. The utility model is used for pumping up the oil in the well. The wellhead 201 is connected to the oil outlet pipe. The wellhead 201 is connected to the oil pipe 205 and extends downward. The drain valve 206 is connected to the oil discharge valve 206, and the single flow valve 207 is connected. The screw pump 208 is connected to the suction port 209. The outlet pipe is connected to the oil pipe 205, and a submersible motor 21 1 and a centralizer 212 are disposed at a lower portion thereof. The cable head 216 of the cable 213 is connected to the submersible motor circuit. The cable is secured to the tubing by a cable clamp 214.

The screw pump of the present invention can use the structure of the spiral transducing device provided by the present invention. The stator structure of the screw pump reduces pump length, increases pump outlet pressure and increases efficiency, and extends service life.

For the downhole electric screw pump, due to the short service life of the stator rotor in the past, it is impossible to carry out long-term oil recovery and is not reused. The hydraulically sealed stator is used to greatly improve the volumetric efficiency and life, and the advantages of using oil and gas mixing can be compared with downhole electric submersible centrifugal pumps and deep well pumps.

Claims

A long life spiral translating device comprising a stator and a rotor, the rotor being a single or multi-headed helical steel shaft; disposed in a matching helical chamber of the stator, characterized by:

The stator comprises an outer cylinder and an elastic stator core made of a soft elastic material, the outer wall of the stator core is a cylindrical shape matching the shape of the outer cylinder cavity, and the inner wall of the stator core is formed a double-headed or multi-headed spiral chamber matched to the rotor, the stator core being fixedly disposed axially and circumferentially in the outer cylinder chamber, a ring between the stator core and the outer cylinder An annular hollow inner tube which is also made of a soft elastic material is disposed in the gap, and is sleeved on the outer wall of the stator rubber core. The inner tube is provided with a mud inlet and outlet, and a tube joint is arranged on the mud inlet and outlet. The side wall of the stator rubber core is also provided with a mud inlet and outlet, and a joint is arranged thereon, and the joint and the inner tube joint are connected by a conduit, so that the spiral chamber of the stator rubber core and the hollow cavity of the inner tube Connected.

2. The long-life spiral transducing device according to claim 1, wherein: the inner tube is provided on the outer wall of the stator core in the longitudinal direction, and each inner tube is fixed on the outer wall of the stator core. Upper

And providing the mud inlet and outlet on the stator core corresponding to each inner tube, wherein the joint is provided, and the inner tube joint on the corresponding inner tube is connected through the conduit; or

Providing the slurry inlet and outlet on the stator core corresponding to each inner tube, wherein the joint is provided thereon, and the inner tube joint on the corresponding inner tube is connected through the conduit, one of the inner tubes With a conduit, one end of the conduit is connected to the high pressure side joint of the stator core and the other end is connected to the joint on the adjacent inner tube and the inner tube.

3. The long life spiral transducing device according to claim 2, wherein: said plurality of inner tubes are evenly distributed along a length direction of the stator core.

4. The long-life spiral transducing device according to claim 1, wherein: the outer cylinder comprises a casing and a split inner cylinder, and the split inner cylinder is equally divided in the circumferential direction, and is at least divided into two. Half, each flap is closed and fixed to the stator rubber core, and the outer casing of the split inner cylinder is fixed.

5. The long-life spiral transducing device according to claim 1, wherein: the axial and circumferential fixing structure between the split inner cylinder and the stator core is: fixed on an inner wall of the split inner cylinder a plurality of blocking rings, which are inserted into the annular grooves provided at corresponding positions on the outer circumferential wall of the stator core to form an axial fixing structure, and a plurality of protrusions are arranged on the end of the blocking ring in the circumferential direction, and the plurality of protrusions are embedded It is arranged in the wall of the stator rubber core to form a circumferential fixed structure.

6. The long life spiral transducing device according to any one of claims 1 to 5, wherein: said long life spiral transducing device is a spiral transducer comprising said stator and rotor, further comprising a a speed increaser, the speed increaser includes an input shaft and an output shaft, and the input shaft is connected to the power The device has an output shaft connected to the rotor, and the input shaft and the output shaft are connected by a speed increasing transmission mechanism.

The long-life spiral transducing device according to claim 6, wherein: the speed increasing transmission mechanism is a wheel train, the input shaft is a circular cross-section cylinder, and an inner gear is disposed on an inner wall thereof. A support frame is further disposed on the inner wall of the cylinder, wherein the support frame is located at the center of the cylinder body, and the outer ring of the bearing is connected with a tie rod, the base rod is rotatably connected to the planetary gear, and the inner ring of the bearing is connected with the central shaft. The shaft is provided with a sun gear, and the planetary gear is combined with the internal gear and the sun gear to form the train wheel. The axis of the sun gear is an output shaft, which is connected by a universal joint shaft or a flexible shaft. The rotor of the energy device.

8. The long-life spiral transducing device according to claim 1, wherein: the long-life spiral transducing device is a screw pump, wherein the stator is connected to the frame, and the stator is provided with a fluid suction port and a pressure outlet. The rotor is coupled to a power transmission.

9. The long life spiral transducing device according to claim 1, wherein: said long life spiral transducing device is a screw drill, wherein a tip of the rotor is provided with a drill bit.

10. The long-life spiral transducing device according to claim 1, wherein: the two ends of the stator core are fixed to the outer casing and the split inner cylinder by a locking joint and a bush; or

The two ends of the stator rubber core are fixed to the outer casing and the split inner cylinder by a locking joint and a bushing, and the locking joint is a cylinder having a stepped hole, and the inner wall of the large and small hole section has an internal thread The bushing is a cylinder having a stepped shape in which the outer hole is a straight hole wall, and external threads are provided on the large end and the small end outer wall of the stepped outer wall, and the outer casing and the end of the split inner cylinder Abutting against a shoulder between the large and small hole segments of the locking joint, the internal thread on the inner wall of the large hole of the locking joint is matched with the corresponding external thread on the outer casing, and the stator rubber core is locked from The large hole end of the joint is inserted into the small hole end, and is placed on the outer wall shoulder of the bushing inserted into the locking joint from the small hole end of the locking joint, the outer thread of the big end of the bushing and the inner hole of the locking joint The threaded mating screw, the outer thread of the small end of the bushing is screwed into the end of the stator core.