Small-signal high-speed rotary valve pulser

Abstract

The invention relates to the technical field of well drilling, in particular to a small-signal high-speed rotary valve pulser which comprises a valve head shell, a stator, a rotor, a rotating shaft and a driving assembly, the inner side of the upper portion of the valve head shell and the outer side of the stator are fixedly installed together, and a plurality of vertically-through upper overflowing holes are evenly distributed in the upper end of the stator at intervals along the circumference; and a rotor is rotationally mounted on the inner side of the valve head shell corresponding to the lower end of the stator. The device is reasonable and compact in structure, in the using process, when the rotor is located at the initial position, the flowing area is the minimum, when the rotor rotates by 22.5 degrees, the flowing area is increased to the maximum, the pressure of slurry changes, pulse signals are formed, in this way, the changed pressure is reserved when the slurry circulates to a well opening, and therefore pressure change signals can be obtained; signal transmission can be achieved through mud pulses, the problem of high-speed transmission of various data in a deep well can be effectively solved, the underground data transmission rate is increased, and therefore the effects of speed increasing and efficiency increasing are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling, and is a small-signal high-speed rotary valve pulser. Background Art

[0002] With the progress of drilling technology, the increasing number of downhole measurement tools is generating more and more data while drilling, making it difficult for traditional mud pulse transmission methods to cope. The existing mud pulse measurement-while-drilling system has a low transmission rate and a narrow displacement adaptation range; while the electromagnetic wave measurement-while-drilling system has relatively strict requirements for formation resistivity and well depth and cannot be widely applied. In response to the data transmission problem, various rotary valve pulsers have been studied in China, with different structures and characteristics, but there is a lack of small-signal high-speed pulsers suitable for deep wells. The instrument has low high-speed transmission ability in deep wells and is difficult to meet the acquisition of downhole data. Summary of the Invention

[0003] The present invention provides a small-signal high-speed rotary valve pulser, which overcomes the above-mentioned deficiencies of the prior art and can effectively solve the problem of low transmission ability of existing instruments in deep wells.

[0004] The technical solution of the present invention is realized by the following measures: A small-signal high-speed rotary valve pulser includes a valve head housing, a stator, a rotor, a rotating shaft and a drive assembly. The inner side of the upper part of the valve head housing is fixedly installed with the outer side of the stator. A plurality of upper flow holes that penetrate up and down are evenly distributed along the circumference at the upper end of the stator. The rotor is rotatably installed on the inner side of the valve head housing corresponding to the lower end position of the stator. A mounting hole that penetrates up and down is provided in the center of the upper end of the rotor. A rotating shaft with the lower end located below the valve head housing is fixedly installed in the mounting hole. Lower flow holes that penetrate up and down are provided at the upper end of the rotor corresponding to the position between every two adjacent upper flow holes. A drive assembly capable of driving the rotating shaft to rotate is installed on the inner side of the lower part of the valve head housing. When the rotating shaft drives the rotor to rotate, the lower flow holes also rotate, and the lower flow holes and the upper flow holes first gradually change from being completely non-coincident to being completely coincident, and then gradually change from being completely coincident to being completely non-coincident.

[0005] The following is a further optimization and / or improvement of the above-mentioned technical solution of the invention: A balance hole that penetrates up and down may be provided in the center of the upper end of the rotating shaft. A limiting ring platform is fixedly installed on the inner side of the mounting hole corresponding to the upper end position of the rotating shaft. A hollow fixing screw is installed in the mounting hole corresponding to the upper end position of the limiting ring platform. The lower end of the fixing screw is fixedly installed on the inner side of the upper end of the balance hole. A balance piston is installed in the balance hole in a sealed and sliding manner. A limiting step is provided on the inner side of the lower part of the balance hole corresponding to the lower position of the balance piston.

[0006] The above-mentioned drive assembly may include a drive motor, a transmission assembly, an upper outer cylinder, and a motor outer cylinder. An inner ring platform sleeved on the outer side of the rotating shaft is fixedly installed on the inner side of the lower part of the valve head housing corresponding to the position below the rotor. A plurality of liquid outlet holes penetrating up and down are evenly distributed at intervals along the circumference at the upper end of the inner ring platform. The lower end of the inner ring platform is fixedly installed with an upper outer cylinder sleeved on the outer side of the lower part of the rotating shaft. At least one seal is sequentially arranged from top to bottom between the inner side of the upper end of the upper outer cylinder and the outer side of the rotating shaft. The lower end of the upper outer cylinder is hermetically and fixedly installed with a motor outer cylinder. A drive motor is hermetically and fixedly installed on the inner side of the lower end of the motor outer cylinder. A transmission assembly is installed in the motor outer cylinder corresponding to the position above the drive motor. And the upper end of the output shaft of the drive motor is in transmission connection with the lower end of the rotating shaft through the transmission assembly.

[0007] The above-mentioned drive assembly may further include a power module and a control module. A lower outer cylinder is hermetically and fixedly installed at the lower end of the motor outer cylinder. A sealing plug is hermetically and fixedly installed on the inner side of the lower end of the motor outer cylinder corresponding to the position between the upper end of the lower outer cylinder and the drive motor. A lower spacer is installed on the inner side of the upper part of the lower outer cylinder. The control module and the power module are installed at intervals from top to bottom on the inner side of the lower outer cylinder corresponding to the position below the lower spacer. The power module is respectively connected to the control module and the drive motor, and the control module is connected to the drive motor.

[0008] The above-mentioned transmission assembly may include a coupling, a connecting seat, and a bearing. The upper end of the output shaft of the drive motor is fixedly installed with the lower end of the coupling sleeved in the motor outer cylinder. The upper end of the coupling is fixedly installed with the lower end of the rotating shaft. A connecting seat with its upper outer side fixedly installed with the inner side of the lower end of the upper outer cylinder is sleeved on the outer side of the coupling. The lower end of the connecting seat is fixedly installed with the upper end of the drive motor. An installation step is provided on the inner side of the lower part of the upper outer cylinder corresponding to the position above the connecting seat. At least two bearings are sequentially installed from top to bottom on the outer side of the rotating shaft corresponding to the position between the installation step and the connecting seat.

[0009] A valve head gland may be fixedly installed on the inner side of the upper end of the valve head housing corresponding to the position above the stator. A plurality of liquid inlet holes penetrating up and down are evenly distributed at intervals along the circumference on the upper side of the valve head gland. A connecting screw with its upper end located above the valve head gland and hollow is fixedly installed at the center of the upper side of the valve head gland.

[0010] An upper spacer may be sleeved between the inner side of the lower part of the valve head housing corresponding to the position below the stator and the outer side of the rotor.

[0011] The structure of the present invention is reasonable and compact. During use, when the rotor is in the starting position, it has the minimum flow area. When the rotor rotates 22.5 degrees, the flow area increases to the maximum, causing the pressure of the mud to change and form a pulse signal. In this way, when the mud circulates to the wellhead, the changing pressure is retained, so that a pressure change signal can be obtained. Signal transmission can be achieved through mud pulses. The present invention can effectively solve the problem of high-speed transmission of various data in deep wells, improve the downhole data transmission rate, and thus achieve the effect of increasing speed and efficiency. Brief Description of the Drawings

[0012] Attached Figure 1 is a schematic cross-sectional structure diagram of the upper half parts of Embodiment 1 to Embodiment 7.

[0013] Attached Figure 2 is a schematic cross-sectional structure diagram of the lower half parts of Embodiment 1 to Embodiment 7.

[0014] Attached Figure 3 is for the attached Figure 1 schematic top view structure diagram of the stator.

[0015] Attached Figure 4 is for the attached Figure 1 schematic top view structure diagram of the rotor.

[0016] Attached Figure 5 is for the attached Figure 1 schematic top view structure diagram when the lower flow hole and the upper flow hole are completely coincident.

[0017] Attached Figure 6 is for the attached Figure 1 schematic top view structure diagram when the lower flow hole and the upper flow hole are completely non - coincident.

[0018] Attached Figure 7 is for the attached Figure 1 schematic top view structure diagram when the lower flow hole and the upper flow hole are partially coincident.

[0019] The codes in the attached drawings are respectively: 1 is the valve head housing, 2 is the stator, 3 is the rotor, 4 is the rotating shaft, 5 is the upper flow hole, 6 is the lower flow hole, 7 is the balance hole, 8 is the limiting ring platform, 9 is the fixing screw, 10 is the balance piston, 11 is the limiting step, 12 is the driving motor, 13 is the upper outer cylinder, 14 is the motor outer cylinder, 15 is the inner ring platform, 16 is the liquid outlet hole, 17 is the seal, 18 is the power supply module, 19 is the control module, 20 is the sealing plug, 21 is the lower spacer, 22 is the coupling, 23 is the connecting seat, 24 is the bearing, 25 is the mounting step, 26 is the valve head gland, 27 is the liquid inlet hole, 28 is the connecting screw, 29 is the upper spacer, 30 is the lower outer cylinder. Detailed Embodiments

[0020] The present invention is not limited by the following embodiments, and the specific implementation manners can be determined according to the technical solutions of the present invention and the actual situation.

[0021] In the present invention, for the convenience of description, the description of the relative position relationship of each component is carried out according to the layout mode of the attached drawings of the specification. For example, the position relationships such as front, back, up, down, left, and right are determined according to the layout direction of the attached drawings of the specification. Figure 1

[0022] ​The present invention will be further described below in conjunction with embodiments and the accompanying drawings: Embodiment 1: As shown in the attached Figures 1 to 7 figure, the small-signal high-speed rotary valve pulsator includes a valve head housing 1, a stator 2, a rotor 3, a rotating shaft 4, and a drive assembly. The inner side of the upper part of the valve head housing 1 is fixedly installed together with the outer side of the stator 2. A plurality of upper flow holes 5 that penetrate up and down are evenly distributed along the circumference at the upper end of the stator 2. A rotor 3 is rotatably installed on the inner side of the valve head housing 1 at a position corresponding to the lower end of the stator 2. A mounting hole that penetrates up and down is provided at the center of the upper end of the rotor 3, and a rotating shaft 4 with its lower end located below the valve head housing 1 is fixedly installed in the mounting hole. Lower flow holes 6 that penetrate up and down are provided at the upper end of the rotor 3 at positions corresponding to each adjacent pair of upper flow holes 5. A drive assembly capable of driving the rotation of the rotating shaft 4 is installed on the inner side of the lower part of the valve head housing 1. When the rotating shaft 4 drives the rotor 3 to rotate, the lower flow holes 6 also rotate accordingly, and the lower flow holes 6 and the upper flow holes 5 first gradually change from being completely non-coincident to being completely coincident, and then gradually change from being completely coincident to being completely non-coincident.

[0023] According to requirements, the number of both the upper flow holes 5 and the lower flow holes 6 is 8. When the rotor 3 rotates 22.5 degrees, the lower flow holes 6 are all completely coincident with the upper flow holes 5. When the rotor 3 rotates another 22.5 degrees, the lower flow holes 6 are all completely non-coincident with the upper flow holes 5. Thus, when the rotating shaft 4 drives the rotor 3 to rotate, the lower flow holes 6 also rotate accordingly, and the lower flow holes 6 and the upper flow holes 5 first gradually change from being completely non-coincident to being completely coincident, and then gradually change from being completely coincident to being completely non-coincident. During use, when the rotor 3 is in the starting position, it has the minimum flow area, the lower flow holes 6 are all completely non-coincident with the upper flow holes 5, and the flow area is zero. When the rotor 3 rotates 22.5 degrees, the flow area increases to the maximum, causing the pressure of the mud to change, forming a pulse signal. In this way, when the mud circulates to the wellhead, the changing pressure is retained, so that a pressure change signal can be obtained, and signal transmission can be achieved through mud pulses. The present invention can effectively solve the problem of high-speed transmission of various data in deep wells, improve the downhole data transmission rate, and thus achieve the effect of increasing speed and efficiency.

[0024] According to actual needs, the above-mentioned small-signal high-speed rotary valve pulsator can be further optimized and / or improved: Embodiment 2: As an optimization of the above embodiment, as shown in the attached Figure 1As shown, a balancing hole 7 is provided in the center of the upper end of the rotating shaft 4, and a limiting ring platform 8 is fixed inside the mounting hole corresponding to the upper end of the rotating shaft 4. A hollow fixing screw 9 is installed in the mounting hole corresponding to the upper end of the limiting ring platform 8. The lower end of the fixing screw 9 is fixedly installed on the inner side of the upper end of the balancing hole 7. A balancing piston 10 is sealingly and slidably installed in the balancing hole 7. A limiting step 11 is provided on the inner side of the lower part of the balancing hole 7 corresponding to the position below the balancing piston 10. During use, through such a setting, when the balancing piston 10 moves up and down, the pressure in the drive assembly can be consistent with the pressure of the mud in the well, so that the torque output by the drive assembly is based on the high-pressure environment in the well, which can reduce the output torque of the drive assembly.

[0025] Embodiment 3: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, the driving assembly includes a driving motor 12, a transmission assembly, an upper outer cylinder 13 and a motor outer cylinder 14. An inner ring stage 15 is fixed to the inner side of the lower part of the valve head housing 1 corresponding to the position below the rotor 3 and is sleeved on the outer side of the rotating shaft 4. The upper end of the inner ring stage 15 is evenly spaced along the circumference with a plurality of liquid outlet holes 16 that pass through the upper and lower parts. The lower end of the inner ring stage 15 is fixedly installed with an upper outer cylinder 13 sleeved on the outer side of the lower part of the rotating shaft. At least one sealing member 17 is arranged from top to bottom between the inner side of the upper end of the upper outer cylinder 13 and the outer side of the rotating shaft 4. The motor outer cylinder 14 is sealed and fixedly installed at the lower end of the upper outer cylinder 13. The driving motor 12 is sealed and fixedly installed on the inner side of the lower end of the motor outer cylinder 14. The transmission assembly is installed in the motor outer cylinder 14 corresponding to the upper side of the driving motor 12, and the upper end of the output shaft of the driving motor 12 and the lower end of the rotating shaft 4 are connected together through the transmission assembly.

[0026] According to the requirements, the drive motor 12 is a known DC motor, the output torque of the drive motor 12 is 32.7 Nm, and the seal 17 is a known rotary seal. In use, through such a setting, the output shaft of the drive motor 12 can rotate synchronously with the rotating shaft 4, reducing the action delay of the rotor 3, so that the change of the mud pressure is synchronized with the change of the speed of the output shaft of the drive motor 12.

[0027] Embodiment 4: As an optimization of the above embodiment, as shown in the attached Figure 1 , 2 As shown, the drive assembly also includes a power module 18 and a control module 19. A lower outer cylinder 30 is sealed and fixedly installed at the lower end of the motor outer cylinder 14. A sealing plug 20 is sealed and fixedly installed on the inner side of the lower end of the motor outer cylinder 14 corresponding to the position between the upper end of the lower outer cylinder 30 and the drive motor 12. A lower spacer 21 is installed on the inner side of the upper part of the lower outer cylinder 30. The control module 19 and the power module 18 are installed on the inner side of the lower outer cylinder 30 corresponding to the lower end of the lower spacer 21 from top to bottom. The power module 18 is respectively connected to the control module 19 and the drive motor 12, and the control module 19 is connected to the drive motor 12.

[0028] According to requirements, a lubricating liquid is filled in the gap between the upper side of the sealing plug 20, the lower side of the seal 17, the inner side of the upper outer cylinder 13, and the inner side of the motor outer cylinder 14. During use, the sealing plug 20 can prevent the lubricating liquid from entering the lower outer cylinder 30 under high pressure and damaging the power module 18 and the control module 19. With such a setting, it is convenient for the modular assembly of the transmission assembly and the drive motor 12, reducing the difficulty of disassembly and assembly. Through the control module 19, the rotation speed of the output shaft of the downhole drive motor 12 can be controlled, and the signals in the downhole can be transmitted to the control module 19, and then the control module 19 controls the rotation speed of the drive motor 12, so that the overlapping area of the lower flow hole 6 and the upper flow hole 5 changes periodically. In this way, after the mud flows through the lower flow hole 6, the pressure changes, and the mud circulates to the wellhead, and the changed pressure of the mud can be analyzed to obtain downhole parameters.

[0029] Embodiment Five: As an optimization of the above embodiment, as shown in the appendix Figure 1 As shown, the transmission assembly includes a coupling 22, a connection seat 23, and a bearing 24. The upper end of the output shaft of the drive motor 12 is fixedly installed with the lower end of the coupling 22 sleeved in the motor outer cylinder 14. The upper end of the coupling 22 is fixedly installed with the lower end of the rotating shaft 4. The outer side of the coupling 22 is sleeved with a connection seat 23 whose upper outer side is fixedly installed with the inner side of the lower end of the upper outer cylinder 13. The lower end of the connection seat 23 is fixedly installed with the upper end of the drive motor 12. An installation step 25 is provided on the inner side of the lower part of the upper outer cylinder 13 corresponding to the position above the connection seat 23. At least two bearings 24 are sequentially installed from top to bottom on the outer side of the rotating shaft 4 corresponding to the position between the installation step 25 and the connection seat 23.

[0030] According to requirements, three bearings 24 are sequentially installed from top to bottom on the outer side of the rotating shaft 4 corresponding to the position between the installation step 25 and the connection seat 23. There is a step on the outer side of the lower part of the rotating shaft 4 that contacts the upper end of the uppermost bearing 24. During use, by setting the coupling 22, it can support the rotating shaft 4 when the rotating shaft 4 rotates relative to the upper outer cylinder 13, and it is also convenient for the transmission connection between the drive motor 12 and the rotating shaft 4. By setting the connection seat 23, it is convenient to install the drive motor 12. By setting the bearings 24, the main shaft can rotate more flexibly in the connection head, and the connection seat 23 and the installation step 25 can position the bearings 24.

[0031] Embodiment Six: As an optimization of the above embodiment, as shown in the appendix Figure 1As shown in the figure, a valve head gland 26 is fixedly installed inside the upper end of the valve head housing 1 corresponding to the upper end position of the stator 2. A number of liquid inlet holes 27 that penetrate up and down are evenly distributed at intervals along the circumference on the upper side of the valve head gland 26. A connecting screw 28 that is hollow and has its upper end located above the valve head gland 26 is fixedly installed at the center of the upper side of the valve head gland 26. During use, by providing the valve head gland 26, it is convenient to fix the stator 2, and by providing the connecting screw 28, it is convenient to connect the valve head gland 26 and the pipe string.

[0032] Embodiment Seven: As an optimization of the above embodiment, as shown in the attached Figure 1 figure, an upper spacer 29 is sleeved between the inner side of the lower part of the valve head housing 1 corresponding to the lower end position of the stator 2 and the outer side of the rotor 3. During use, by providing the upper spacer 29, the wear degree of the valve head housing 1 can be reduced, the service life of the valve head housing 1 can be extended, and the maintenance cost can also be reduced.

[0033] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effects. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A small signal high rate rotary valve pulser, Features The valve body comprises a valve head shell, a stator, a rotor, a rotating shaft and a driving assembly. The inner side of the upper part of the valve head shell is fixedly installed with the outer side of the stator. A plurality of upper flow holes that penetrate vertically are evenly distributed along the circumference on the upper end of the stator. A rotor is rotatably installed on the inner side of the valve head shell corresponding to the lower end of the stator. A mounting hole that penetrates vertically is provided in the center of the upper end of the rotor. A rotating shaft with its lower end located below the valve head shell is fixedly installed in the mounting hole. Lower flow holes that penetrate vertically are provided on the upper end of the rotor corresponding to the position between each two adjacent upper flow holes. A driving assembly that can drive the rotating shaft to rotate is installed on the inner side of the lower part of the valve head shell. When the rotating shaft drives the rotor to rotate, the lower flow holes also rotate, and the lower flow holes and the upper flow holes gradually change from completely non-overlapping to completely overlapping, and then gradually change from completely overlapping to completely non-overlapping.

2. The small signal high rate rotary valve pulser according to claim 1, Features A balancing hole which passes through from top to bottom is provided in the center of the upper end of the rotating shaft, a limiting ring is fixed on the inner side of the mounting hole corresponding to the upper end of the rotating shaft, a hollow fixing screw is installed in the mounting hole corresponding to the upper end of the limiting ring, the lower end of the fixing screw is fixedly installed on the inner side of the upper end of the balancing hole, a balancing piston is sealingly and slidably installed in the balancing hole, and a limiting step is provided on the inner side of the lower part of the balancing hole corresponding to the position below the balancing piston.

3. The small signal high rate rotary valve pulser according to claim 1 or 2, Features The driving assembly includes a driving motor, a transmission assembly, an upper outer cylinder and a motor outer cylinder. An inner ring stage which is sleeved on the outer side of the rotating shaft is fixed to the inner side of the lower part of the valve head shell corresponding to the position below the rotor. A plurality of liquid outlet holes which are evenly distributed up and down along the circumference on the upper end of the inner ring stage are arranged. An upper outer cylinder which is sleeved on the outer side of the lower part of the rotating shaft is fixedly installed on the lower end of the inner ring stage. At least one sealing member is arranged from top to bottom between the inner side of the upper end of the upper outer cylinder and the outer side of the rotating shaft. A motor outer cylinder is sealed and fixedly installed on the lower end of the upper outer cylinder. A driving motor is sealed and fixedly installed on the inner side of the lower end of the motor outer cylinder. A transmission assembly is installed in the motor outer cylinder corresponding to the upper side of the driving motor, and the upper end of the output shaft of the driving motor and the lower end of the rotating shaft are connected together through the transmission assembly.

4. The small signal high rate rotary valve pulser according to claim 3, Features The drive assembly also includes a power module and a control module. A lower outer cylinder is sealed and fixedly installed at the lower end of the motor outer cylinder, a sealing plug is sealed and fixedly installed on the inner side of the lower end of the motor outer cylinder corresponding to the position between the upper end of the lower outer cylinder and the drive motor, a lower spacer is installed on the inner side of the upper part of the lower outer cylinder, and a control module and a power module are installed on the inner side of the lower outer cylinder corresponding to the lower end of the lower spacer from top to bottom. The power module is respectively connected to the control module and the drive motor, and the control module is connected to the drive motor.

5. The small signal high rate rotary valve pulser according to claim 3, Features The transmission assembly includes a coupling, a connecting seat and bearings. The upper end of the output shaft of the driving motor is fixedly installed together with the lower end of the coupling sleeved inside the motor outer cylinder. The upper end of the coupling is fixedly installed together with the lower end of the rotating shaft. A connecting seat with its upper outer side fixedly installed with the inner side of the lower end of the upper outer cylinder is sleeved outside the coupling. The lower end of the connecting seat is fixedly installed with the upper end of the driving motor. An installation step is provided on the inner side of the lower part of the upper outer cylinder corresponding to the position above the connecting seat. At least two bearings are sequentially installed from top to bottom on the outer side of the rotating shaft corresponding to the position between the installation step and the connecting seat.

6. The small-signal high-speed rotary valve pulsator according to claim 4, characterized in that The transmission assembly includes a coupling, a connecting seat and bearings. The upper end of the output shaft of the driving motor is fixedly installed together with the lower end of the coupling sleeved inside the motor outer cylinder. The upper end of the coupling is fixedly installed together with the lower end of the rotating shaft. A connecting seat with its upper outer side fixedly installed with the inner side of the lower end of the upper outer cylinder is sleeved outside the coupling. The lower end of the connecting seat is fixedly installed with the upper end of the driving motor. An installation step is provided on the inner side of the lower part of the upper outer cylinder corresponding to the position above the connecting seat. At least two bearings are sequentially installed from top to bottom on the outer side of the rotating shaft corresponding to the position between the installation step and the connecting seat.

7. The small-signal high-speed rotary valve pulsator according to claim 1 or 2 or 4 or 5 or 6, characterized in that A valve head gland is fixedly installed on the inner side of the upper end of the valve head housing corresponding to the upper end of the stator. A plurality of liquid inlet holes penetrating up and down are evenly distributed at intervals along the circumference on the upper side of the valve head gland. A connecting screw with its upper end located above the valve head gland and hollow is fixedly installed in the center of the upper side of the valve head gland.

8. The small-signal high-speed rotary valve pulsator according to claim 3, characterized in that A valve head gland is fixedly installed on the inner side of the upper end of the valve head housing corresponding to the upper end of the stator. A plurality of liquid inlet holes penetrating up and down are evenly distributed at intervals along the circumference on the upper side of the valve head gland. A connecting screw with its upper end located above the valve head gland and hollow is fixedly installed in the center of the upper side of the valve head gland.

9. The small-signal high-speed rotary valve pulsator according to claim 1 or 2 or 4 or 5 or 6 or 8, characterized in that An upper spacer is sleeved between the inner side of the lower part of the valve head housing corresponding to the lower end of the stator and the outer side of the rotor.

10. The small-signal high-speed rotary valve pulsator according to claim 3, characterized in that An upper spacer is sleeved between the inner side of the lower part of the valve head housing corresponding to the lower end of the stator and the outer side of the rotor.

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