Alternating injection of water and gas into a flow channel structure

Abstract

The application discloses a water-gas dual-phase medium alternate injection electrodeless adjusting flow channel structure, which comprises a flow nozzle opening degree adjusting core shaft, a flow nozzle valve seat and an alloy erosion-resistant flow nozzle. An inner injection channel is arranged on the side wall of the flow nozzle opening degree adjusting core shaft. The flow nozzle valve seat is arranged on the outer circumferential surface of the flow nozzle opening degree adjusting core shaft. The alloy erosion-resistant flow nozzle is fixedly connected to the flow nozzle valve seat. The alloy erosion-resistant flow nozzle is provided with an outer injection channel. The flow nozzle opening degree adjusting core shaft is adapted to rotate relative to the flow nozzle valve seat in the circumferential direction. Along the rotating path of the flow nozzle opening degree adjusting core shaft, one of the inner injection channel and the outer injection channel is provided with a first part and a second part which are respectively adapted to inject gas and water, and the other one is gradually connected to the first part and the second part during relative rotation. During the rotation of the flow nozzle opening degree adjusting core shaft, the first part and the second part are gradually connected, so that the alternate conversion of gas injection and water injection is realized. The alternate conversion of gas injection and water injection can be realized only by the rotation of the flow nozzle opening degree adjusting core shaft, and the efficient, easy-to-grasp and fine-adjustable structure is realized.

Description

Technical Field

[0001] This invention relates to the field of downhole injection flow rate control technology for water and gas injection development in oilfields, and particularly to a stepless adjustable flow channel structure for alternating injection of water and gas two-phase media. Background Technology

[0002] Oilfield water injection technology has evolved to the stage of intelligent water injection technology. Among them, the integrated water injection technology with simultaneous measurement and adjustment, as a currently dominant intelligent water injection technology, has been widely applied in oilfields due to its ability to realize online real-time water injection flow testing and control of injection wells. With the national carbon peaking and carbon neutrality goals imposing stricter controls on carbon dioxide emissions, and the continuous in-depth research on gas-driven development technology in oilfields, the demand for gas injection development technology has been increasing. Therefore, there is a need to provide a regulating flow channel structure to efficiently and easily achieve water-gas alternating injection. Summary of the Invention

[0003] To address the aforementioned problems, the purpose of this invention is to provide a stepless adjustable flow channel structure for alternating injection of a water-air two-phase medium. During the rotation of the nozzle opening adjustment mandrel, the first and second parts are gradually connected, thereby realizing the alternating conversion between air injection and water injection. The alternating conversion between air injection and water injection can be achieved simply by rotating the nozzle opening adjustment mandrel, which has the beneficial effects of high efficiency, ease of control, and the ability to achieve fine adjustment.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A steplessly adjustable flow channel structure for alternating injection of a water-air two-phase medium includes a nozzle opening adjustment mandrel and a nozzle valve seat. A flow channel is formed within the nozzle opening adjustment mandrel, and an inner injection channel communicating with the flow channel is formed on its longitudinal sidewall. The nozzle valve seat is sleeved on the outer circumferential surface of the nozzle opening adjustment mandrel, and an alloy erosion-resistant nozzle is fixedly connected to it near the inner injection channel. The alloy erosion-resistant nozzle has an outer injection channel adapted to communicate with the inner injection channel. The nozzle opening adjustment mandrel is adapted to be driven to rotate circumferentially relative to the nozzle valve seat. Along the rotation path of the nozzle opening adjustment mandrel, one of the inner injection channel and the outer injection channel is configured to include a first part and a second part with dimensions suitable for air injection and water injection, respectively, and the other part is adapted to gradually connect the first part and the second part during relative rotation.

[0006] According to at least one embodiment of the present invention, the external injection channel is configured to include the first portion and the second portion; the internal injection channel is configured as a strip-shaped through hole extending along the rotation direction of the nozzle opening adjustment mandrel, the first portion is configured as an air injection through hole, the second portion is configured as a water injection through hole, the diameter of the air injection through hole is smaller than that of the water injection through hole and is spaced in multiples along the rotation path of the internal injection channel.

[0007] According to at least one embodiment of the present invention, both the external injection channel and the internal injection channel are configured in pairs, and both the external injection channel and the internal injection channel are centrally symmetrical about the axis of the nozzle opening adjustment mandrel.

[0008] According to at least one embodiment of the present invention, the first portion of each external injection channel includes seven independent air injection holes, and the second portion of each external injection channel includes one water injection hole.

[0009] According to at least one embodiment of the present invention, the nozzle seat and the alloy erosion-resistant nozzle are assembled into one piece by a hot-fitting process to achieve fastening and sealing between the two.

[0010] According to at least one embodiment of the present invention, a preload spring is sleeved on the outer peripheral surface of the first end of the nozzle opening adjustment mandrel along the axial direction, and an inner sealing cone surface is provided at the second end, which gradually tapers away from the first end. The inner injection channel is provided at the inner sealing cone surface. The alloy erosion-resistant nozzle is provided with an outer sealing cone surface adapted to abut against the inner sealing cone surface, and the outer injection channel is provided at the outer sealing cone surface. A spring retaining ring is provided on the outer peripheral surface of the first end. One end of the preload spring abuts against the spring retaining ring along the elastic deformation direction to push the nozzle opening adjustment mandrel so that the inner sealing cone surface tightly abuts against the outer sealing cone surface.

[0011] According to at least one embodiment of the present invention, a low-resistance rotary sealing module is further provided at the contact position between the nozzle opening adjustment mandrel and the alloy erosion-resistant nozzle to achieve axial contact sealing between the nozzle opening adjustment mandrel and the alloy erosion-resistant nozzle.

[0012] According to at least one embodiment of the present invention, a groove is provided on the inner wall of the alloy erosion-resistant nozzle on the side of the outer sealing cone facing away from the first end, the groove extends circumferentially around the alloy erosion-resistant nozzle, and the low-resistance rotary sealing module is disposed in the groove.

[0013] According to at least one embodiment of the present invention, the first end is adapted to be driven by the output end of a power supply motor, and the motor rotates to drive the nozzle opening adjustment spindle to rotate in the circumferential direction relative to the alloy erosion resistant nozzle.

[0014] According to at least one embodiment of the present invention, the end face of the first end is provided with an installation opening and its side wall surface near the installation opening is provided with a first fixing position. The installation opening is adapted to allow a drive shaft to pass through. The outer peripheral surface of one end of the drive shaft in the axial direction is provided with a second fixing position adapted to be fixedly connected to the first fixing position, and the other end is driven by the output end of the motor to rotate circumferentially.

[0015] According to at least one embodiment of the present invention, the first fixing position is configured as a strip-shaped torque transmission groove extending axially along the nozzle opening adjustment mandrel, and the second fixing position is configured as a boss suitable for insertion into the strip-shaped torque transmission groove. Both the strip-shaped torque transmission groove and the boss are uniformly arranged in multiples along the circumference of the nozzle opening adjustment mandrel.

[0016] Because the present invention adopts the above technical solution, it has at least the following advantages:

[0017] The nozzle opening adjustment spindle is adapted to be driven to rotate circumferentially relative to the nozzle valve seat. When rotated to a certain position, the inner injection channel and the outer injection channel coincide and connect. At this time, the medium in the flow channel can be injected outward through the inner and outer injection channels. That is, the injection of medium can be started and stopped by rotating the nozzle opening adjustment spindle. Furthermore, the first and second parts of one of the inner and outer injection channels have different dimensions. The first part is suitable for air injection, and the second part is suitable for water injection. During relative rotation, the other of the inner and outer injection channels will gradually connect the first and second parts. When connected to the first part, it can be used for air injection. If the nozzle opening adjustment spindle continues to rotate, the second part will also be connected, thus enabling water injection. Since the rotation angle and direction of the nozzle opening adjustment spindle itself can be adjusted according to actual needs, the alternation of air injection and water injection operations can be achieved efficiently and easily. In addition, by controlling the degree of rotation of the nozzle opening adjustment spindle, alternating injection of water and air can be achieved. This process is efficient, simple, easy to control, and allows for fine adjustment. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the water-gas two-phase medium alternating injection stepless regulating flow channel in at least one embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of the alloy erosion-resistant nozzle for alternating injection of water-gas two-phase media into a stepless adjustable flow channel, according to at least one embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of the structure of the nozzle opening adjustment mandrel of the water-air two-phase medium alternating injection infinitely adjustable flow channel in at least one embodiment of the present invention.

[0021] Marked in the attached diagram:

[0022] 1 is an alloy erosion-resistant nozzle;

[0023] 2 is the flow nozzle valve seat;

[0024] 3 is the nozzle opening adjustment spindle;

[0025] 4 is a spring retaining ring;

[0026] 5 represents the preload spring;

[0027] 6 is a low-resistance rotary sealing module;

[0028] 7 represents the motor;

[0029] 8 represents the drive shaft;

[0030] 101 is the gas injection channel;

[0031] 102 is the water injection channel;

[0032] 103 is the inner sealing cone surface;

[0033] 301 is a transmission torque groove;

[0034] 302 is the outer sealing cone surface;

[0035] 303 is the internal injection channel. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0037] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the system or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0038] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "assembly," "setup," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] In the field of downhole injection flow control technology for water and gas injection development in oilfields, there is a need for a highly efficient, easy-to-control, and finely adjustable flow channel structure. Furthermore, compared to water injection, gas injection, due to the lower viscosity of the injected fluid, results in significantly less pressure loss under the same displacement and flow area conditions. However, current integrated flow channel control structures using simultaneous measurement and adjustment technologies cannot meet the requirements for fine-tuning of gas injection volume. Simultaneously, the alternating water-gas injection proposed in oilfield development presents further challenges to flow channel design; currently, there is no highly efficient flow channel control structure that can efficiently, easily, and accurately achieve alternating water-gas injection.

[0040] To solve at least one of the above problems, embodiments of the present invention provide an adjustable flow channel structure to achieve efficient and simple water-air alternating injection.

[0041] The following is a detailed description of the water-gas two-phase medium alternating injection stepless regulating flow channel structure provided in the embodiments of the present invention, with reference to the accompanying drawings.

[0042] Reference Figures 1 to 3 As shown, in at least one embodiment, the water-air two-phase medium alternating injection stepless adjustable flow channel structure includes: a nozzle opening adjustment mandrel 3 and a nozzle valve seat 2. A flow channel is formed inside the nozzle opening adjustment mandrel 3, and an inner injection channel 203 communicating with the flow channel is opened on its side wall in the length direction; the nozzle valve seat 2 is sleeved on the outer circumferential surface of the nozzle opening adjustment mandrel 3, and an alloy erosion-resistant nozzle 1 is fixedly connected to it near the inner injection channel 203. The alloy erosion-resistant nozzle 1 is opened with an outer injection channel suitable for communicating with the inner injection channel 203. The nozzle opening adjustment mandrel 3 is suitable for being driven to rotate relative to the nozzle valve seat 2 in the circumferential direction. Along the rotation path of the nozzle opening adjustment mandrel 3, one of the inner injection channel 203 and the outer injection channel is configured to include a first part and a second part with dimensions suitable for air injection and water injection, respectively, and the other part is suitable for gradually connecting the first part and the second part during relative rotation.

[0043] In the above embodiment, when the nozzle opening adjustment spindle 3 is rotated to a certain position, the inner injection channel 203 coincides with the outer injection channel and is connected. At this time, the medium in the channel is injected outward through the inner injection channel 203 and the outer injection channel due to the pressure difference inside and outside the channel. That is, the injection of medium (including gas and water) can be started and stopped by rotating the nozzle opening adjustment spindle 3.

[0044] The first and second portions of one of the internal injection channel 203 and the external injection channel have different dimensions, wherein the first portion is smaller and suitable for gas injection, and the second portion is larger and suitable for water injection.

[0045] In the initial state, the inner injection channel 203 is completely offset from the outer injection channel. At this time, the injected fluid medium in the flow channel cannot enter the external space, and the flow channel is in a completely closed state.

[0046] When the nozzle opening adjustment spindle 3 starts to rotate, the inner injection channel 203 gradually overlaps and connects with the first part, and the injection flow rate is controlled by adjusting the overlapping flow area.

[0047] When water injection is required, the overlapping flow area of ​​the first part cannot meet the water injection volume adjustment under certain discharge conditions. At this time, continue to rotate the nozzle opening adjustment spindle 3 so that the inner injection channel 203 begins to slowly overlap with the second part. By adjusting the overlapping flow area, the purpose of controlling the water injection flow rate is achieved.

[0048] In this way, alternating between air injection and water injection operations can be achieved efficiently and easily. It is worth noting that water injection can be achieved whether both the first and second parts are connected, or only the second part is connected.

[0049] It is worth noting that since the rotation angle and direction of the nozzle opening adjustment spindle 3 can be adjusted according to actual needs, it has excellent practical application effects. In this embodiment of the invention, the alternating injection of water and air can be achieved by controlling the rotation degree of the nozzle opening adjustment spindle 3. This process is efficient, simple, easy to control, and can achieve fine adjustment.

[0050] Optionally, in at least one embodiment, the external injection channel is configured to include a first part and a second part; the internal injection channel 203 is configured as a strip-shaped through-hole extending along the rotation direction of the nozzle opening adjustment mandrel 3, the first part is configured as an air injection through-hole 101, and the second part is configured as a water injection through-hole 102. The diameter of the air injection through-hole 101 is smaller than that of the water injection through-hole 102, and multiple through-holes are spaced apart along the rotation path of the internal injection channel 203. The water injection through-hole 102 and the multiple air injection through-holes 101 are independently configured, and the internal injection channel 203 overlaps and connects with different numbers of air injection through-holes 101, thereby forming different flow areas.

[0051] Understandably, the multiple air injection holes 101 are small in size and set independently. By controlling the number of air injection holes 101, the amount of air injected can be well controlled, thereby achieving the purpose of precision air injection.

[0052] However, this design is not limited to this. In other embodiments, the inner injection channel 203 may be configured to include a first part and a second part, and the outer injection channel may be configured as a strip-shaped through hole extending along the rotation direction of the nozzle opening adjustment mandrel 3.

[0053] In other embodiments, the first part and the second part are independent of each other, and the first part is configured as an elongated hole extending along the rotation direction of the nozzle opening adjustment mandrel 3, the width of which is suitable for air injection.

[0054] Optionally, in at least one embodiment, both the external injection channel and the internal injection channel 203 are configured as two, and both the two external injection channels and the two internal injection channels 203 are centrally symmetrical about the axis of the nozzle opening adjustment spindle 3. In this way, under the condition that the size of a single air injection unit and a single water injection unit is limited, a sufficiently large air injection volume and water injection volume can be guaranteed, and the centrally symmetrical arrangement can ensure that the overlapping flow area formed during rotation presents a regular change, thereby facilitating precise control of the air injection volume and water injection volume.

[0055] Furthermore, in other embodiments, the external injection channels and internal injection channels 203 may also be configured to other quantities, such as three, and these external injection channels and internal injection channels 203 are evenly spaced along the axial direction of the nozzle opening adjustment mandrel 3.

[0056] Optionally, in at least one embodiment, the first part of each external injection channel includes seven independent air injection holes 101, and the second part of each external injection channel includes one water injection hole 102.

[0057] However, this design is not limited to this. In other embodiments, the number of air injection holes 101 and water injection holes 102 may also be set to other numbers. For example, the first part of each external injection channel includes eight independent air injection holes 101.

[0058] Without loss of generality, in at least one embodiment, the nozzle seat 2 and the alloy erosion-resistant nozzle 1 are assembled together using a hot-fitting process to achieve fastening and sealing between them. Optionally, the alloy erosion-resistant nozzle 1 and the nozzle opening adjustment spindle 3 adopt an all-metal sealing structure, which improves the long-term reliability of the structure under high-volume injection conditions.

[0059] Optionally, in at least one embodiment, a pre-tightening spring 5 is sleeved on the outer peripheral surface of the first end of the nozzle opening adjustment spindle 3 along the axial direction, and an inner sealing cone surface 103 that gradually narrows away from the first end is provided at the second end. An inner injection channel 203 is provided at the inner sealing cone surface 103. An alloy erosion resistant nozzle 1 is provided with an outer sealing cone surface 202 suitable for abutting against the inner sealing cone surface 103, and an outer injection channel is provided at the outer sealing cone surface 202. A spring retaining ring 4 is provided on the outer peripheral surface of the first end. One end of the pre-tightening spring 5 abuts against the spring retaining ring 4 along the elastic deformation direction to push the nozzle opening adjustment spindle 3 so that the inner sealing cone surface 103 tightly abuts against the outer sealing cone surface 202.

[0060] Understandably, since the nozzle opening adjustment spindle 3 and the nozzle valve seat 2 are rotatably connected, and the communication between the inner injection channel 203 and the air injection through-hole 101 and water injection through-hole 102 frequently alternates, it is necessary to ensure the sealing performance between the nozzle opening adjustment spindle 3 and the nozzle valve seat 2 in the air injection position and the water injection position. In this embodiment, the tight contact between the inner sealing cone surface 103 and the outer sealing cone surface 202, which are inclined to the direction of the preload spring 5, ensures the sealing performance between the nozzle opening adjustment spindle 3 and the nozzle valve seat 2 in the air injection position and the water injection position during the rotation of the nozzle opening adjustment spindle 3.

[0061] Furthermore, in at least one embodiment, a low-resistance rotary sealing module 6 is provided at the junction of the nozzle opening adjustment spindle 3 and the alloy erosion-resistant nozzle 1 to achieve axial contact sealing between the nozzle opening adjustment spindle 3 and the alloy erosion-resistant nozzle 1. This further ensures the sealing performance between the nozzle opening adjustment spindle 3 and the alloy erosion-resistant nozzle 1 during rotation in both the air injection and water injection positions.

[0062] Furthermore, in at least one embodiment, a groove is formed on the inner wall of the alloy erosion-resistant nozzle 1 on the side of the outer sealing cone 202 opposite to the first end. The groove extends circumferentially around the alloy erosion-resistant nozzle 1, and the low-resistance rotary sealing module 6 is disposed in the groove. Further, the inner wall of the alloy erosion-resistant nozzle 1 portion on the side of the outer sealing cone 202 opposite to the first end, and the outer wall of the nozzle opening adjustment spindle 3 portion on the side of the inner sealing cone 103 opposite to the first end, are both parallel to the axial direction of the nozzle opening adjustment spindle 3. The groove for the low-resistance rotary sealing module 6 is disposed on the inner wall of this portion of the alloy erosion-resistant nozzle 1.

[0063] Optionally, in at least one embodiment, the first end is adapted to be driven by the output of the motor 7, and the rotation of the motor 7 drives the nozzle opening adjustment spindle 3 to rotate circumferentially relative to the alloy erosion-resistant nozzle 1. In this way, by driving the nozzle opening adjustment spindle 3 to rotate via the motor 7, the flow control accuracy can be improved, especially since the motor 7 is configured as a servo motor.

[0064] However, this design is not limited to this. In other embodiments, other devices can also be used to drive the nozzle opening adjustment spindle 3 to rotate.

[0065] Optionally, in at least one embodiment, the end face of the first end has a mounting opening, and its side wall surface near the mounting opening has a first fixing position. The mounting opening is suitable for a drive shaft 8 to pass through. One axial end of the drive shaft 8 has a second fixing position on its outer circumferential surface suitable for being fixed to the first fixing position, and the other end is driven by the output end of the motor 7 to rotate circumferentially. In this way, the motor 7 can drive the nozzle opening adjustment spindle 3 to rotate. Optionally, the outer circumferential surface of the drive shaft 8 is sealed to the inner wall surface of the first end.

[0066] However, this design is not limited to this. In other embodiments, the motor 7 can also drive the nozzle opening adjustment spindle 3 to rotate through other types of structures, such as gears.

[0067] Furthermore, in one embodiment, the first fixing position is configured as a strip-shaped torque transmission groove 201 extending axially along the nozzle opening adjustment spindle 3, and the second fixing position is configured as a boss suitable for insertion into the strip-shaped torque transmission groove 201. Multiple strip-shaped torque transmission grooves 201 and bosses are evenly arranged circumferentially along the nozzle opening adjustment spindle 3. When the boss is inserted into the strip-shaped torque transmission groove 201, the motor 7 drives the transmission shaft 8 to rotate, thereby driving the nozzle opening adjustment spindle 3 to rotate. The axial extension of the strip-shaped torque transmission groove 201 along the nozzle opening adjustment spindle 3 ensures a sufficiently long force-bearing area, thereby allowing the transmission shaft 8 to better drive the nozzle opening adjustment spindle 3 to rotate.

[0068] However, this design is not limited to this. In other embodiments, the first fixing position and the second fixing position can also be configured as other structures, such as a snap-fit ​​structure.

[0069] Optionally, eight strip-shaped torque transmission grooves 201 are evenly distributed around the spout opening adjustment spindle 3. The protrusions on the drive shaft 8 are locked to the strip-shaped torque transmission grooves 201. When the motor 7 is powered on and rotates through the reduction mechanism, the torque is transmitted to the drive shaft 8 and drives it to rotate synchronously. The torque is further transmitted to the locked strip-shaped torque transmission grooves 201, thereby driving the spout opening adjustment spindle 3 to rotate.

[0070] It should be noted that the "and / or" in the text includes three options. Taking "A and / or B" as an example, it includes technical option A, technical option B, and technical option that satisfies both A and B.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A steplessly adjustable flow channel structure for alternating injection of water-gas two-phase media, characterized in that, include: The nozzle opening adjustment spindle has an internal flow channel, and its side wall along its length has an internal injection channel that communicates with the flow channel. A nozzle valve seat is sleeved on the outer circumferential surface of the nozzle opening adjustment spindle. An alloy erosion-resistant nozzle is fixedly connected to the nozzle valve seat near the inner injection channel. The alloy erosion-resistant nozzle has an outer injection channel adapted to communicate with the inner injection channel. The nozzle opening adjustment spindle is adapted to be driven to rotate relative to the nozzle valve seat in the circumferential direction. Along the rotation path of the nozzle opening adjustment spindle, one of the inner injection channel and the outer injection channel is configured to include a first part and a second part with dimensions adapted to inject air and water respectively, and the other part is adapted to gradually connect the first part and the second part during relative rotation. The external injection channel is configured to include the first part and the second part; The internal injection channel is configured as a strip-shaped through hole extending along the rotation direction of the nozzle opening adjustment spindle. The first part is configured as an air injection through hole, and the second part is configured as a water injection through hole. The diameter of the air injection through hole is smaller than that of the water injection through hole, and multiple holes are spaced apart along the rotation path of the internal injection channel. Both the external injection channel and the internal injection channel are configured in twos, and both the external injection channel and the internal injection channel are centrally symmetrical about the axis of the nozzle opening adjustment mandrel. The first part of each external injection channel includes seven independent air injection holes, and the second part of each external injection channel includes one water injection hole; The flow valve seat and the alloy erosion resistant flow nozzle are assembled into one piece using a hot-fitting process to achieve fastening and sealing between the two. The nozzle opening adjustment spindle has a preload spring sleeved on the outer circumferential surface of its first end along the axial direction, and an inner sealing cone surface that tapers away from the first end at its second end. The inner injection channel is located at the inner sealing cone surface. The alloy erosion-resistant nozzle has an outer sealing cone surface adapted to abut against the inner sealing cone surface, and the outer injection channel is located at the outer sealing cone surface. A spring retaining ring is provided on the outer circumferential surface of the first end. One end of the preload spring abuts against the spring retaining ring along the elastic deformation direction to push the nozzle opening adjustment spindle so that the inner sealing cone surface tightly abuts against the outer sealing cone surface. A low-resistance rotary sealing module is also provided at the junction of the nozzle opening adjustment mandrel and the alloy erosion-resistant nozzle to achieve axial contact sealing between the nozzle opening adjustment mandrel and the alloy erosion-resistant nozzle. A groove is provided on the inner wall of the alloy erosion-resistant nozzle on the side of the outer sealing cone surface opposite to the first end. The groove extends circumferentially around the alloy erosion-resistant nozzle, and the low-resistance rotary sealing module is disposed in the groove. The first end is adapted to be driven by the output end of the power supply motor, and the motor rotates to drive the nozzle opening adjustment spindle to rotate in the circumferential direction relative to the alloy erosion resistant nozzle. The first end has an opening for mounting, and its sidewall is provided with a first fixing position near the opening. The opening is suitable for a drive shaft to pass through. One end of the drive shaft is provided with a second fixing position on its outer circumferential surface, which is suitable for being fixed to the first fixing position. The other end is driven by the output end of the motor to rotate circumferentially. And / or the first fixing position is configured as a strip-shaped torque transmission groove extending axially along the nozzle opening adjustment spindle. The second fixing position is configured as a boss suitable for being inserted into the strip-shaped torque transmission groove. Multiple strip-shaped torque transmission grooves and bosses are evenly arranged along the circumference of the nozzle opening adjustment spindle.

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