A continuously adjustable intermediate annular gap jet-type static ejector

Abstract

The present invention relates to a continuously adjustable intermediate annular gap jet-type static ejector, which belongs to the field of ejection and pressurization using fluid jets. It is mainly composed of a back-tightening nut, an equipment housing, a high-pressure inlet pipe, a regulator, a low-pressure center tube, a fixed sleeve, a low-pressure inlet pipe, a mixing expansion tube and a medium-pressure outlet pipe. The present invention adopts an intermediate annular gap high-pressure jet and constructs two low-pressure fluid flow paths inside and outside the annular high-pressure jet, thereby effectively avoiding the steering and wall-attached flow losses of the radial high-pressure jet of the traditional annular gap ejector, and enhancing the contact, mixing and energy transfer effects of high and low-pressure fluids; the fluid flow path is constructed by using the cylinder wall or inner hole of the low-pressure center tube, fixed sleeve, mixing diffusion tube and other components, which can be flexibly configured and easy to adjust and replace; a regulator is provided, and the continuous adjustment of the high-pressure jet annular gap can be achieved through the external hand wheel of the equipment without disassembling the equipment, thereby enhancing the adaptability of the equipment to different flow and pressure conditions.

Description

Technical Field

[0001] The invention relates to a continuously adjustable intermediate annular gap jet-type static ejector, belonging to the field of realizing ejection and pressurization by using gas jets. Background Art

[0002] A static ejector is a static technical device that enables energy transfer and equalization between fluids with different energies. It primarily utilizes a high-pressure nozzle in the shape of a Laval nozzle or a convergent nozzle to form a high-speed jet of high-energy, high-pressure fluid, which then entrains and ejects the lower-energy, low-pressure fluid. Energy transfer between the high- and low-energy streams is then achieved through direct mixing, ultimately forming a uniform intermediate-pressure stream product. This type of device is static and has advantages such as simple structure, ease of operation, low manufacturing and maintenance costs, and no special requirements for installation location or method. Therefore, it has a wide range of applications in natural gas ejection and boosting production, steam refrigeration cycles, fuel injection systems, material absorption and transportation, and new fuel cells.

[0003] The core component, a high-pressure jet nozzle, is located at the center of the device, and the central static ejector, with a generally circular gas flow cross-section, is a relatively common form of technical equipment for static ejection technology. However, when the fluid processing volume is large, the diameter of the cylindrical high-pressure jet stream formed within the central static ejector is too large, which not only easily compresses the low-pressure fluid flow space, but also easily increases the time required for fluid turbulence, diffusion, and mixing, decreases energy transfer, and leads to excessive length and diameter of the equipment. In addition, central static ejectors are usually regulated by an adjustable cone, and the cone core of the cantilever beam structure is prone to fatigue fracture and other problems, which also hinders the long-term large-scale application of this technology in fields such as natural gas extraction.

[0004] Compared to the aforementioned types, the high-pressure jet in an annular slot static ejector, whose nozzle has an annular flow cross-section, is a thin, laminar, annular jet, more conducive to fluid mixing and energy exchange. This is exemplified by patented annular slot ejector design (ZL201710278955.7). However, this type of ejector still faces challenges such as high flow losses during high-pressure annular jet steering and difficulty adjusting the nozzle throat flow area.

[0005] Therefore, how to reduce the flow loss of high-pressure annular jets, improve the turbulent diffusion and energy exchange efficiency within the annular gap ejector, and enhance the adjustability of the equipment are technical problems that technical personnel in this field urgently need to solve. Summary of the Invention

[0006] In order to solve the above-mentioned existing technical problems, the present invention provides a continuously adjustable intermediate annular gap jet type static ejector, in which the high-pressure jet adopts an intermediate annular gap jet, and the low-pressure jet adopts a combined flow form of a central low-pressure jet and an outer annular low-pressure jet. It can not only maintain the advantages of the annular high-pressure jet such as large flow rate, thin flow thickness, and strong suction ability, but also improve the problems of high-pressure jet turning, large wall flow loss, and only direct contact between the inner surface of the high-pressure annular flow and the low-pressure gas of the traditional annular gap static ejector. It helps to improve the energy transfer efficiency inside the annular gap jet type static ejector, accelerate the fluid energy transfer and balancing process in the equipment, and thus improve the performance and compactness of the equipment.

[0007] The present invention provides a combined jet flow channel construction scheme and related structures, wherein the high-pressure jet annular seam is composed of an annular jet flow channel formed between the outer wall of the low-pressure center tube and the inner wall of the fixed sleeve; the low-pressure flow channel is composed of the center hole of the low-pressure center tube and the annular flow channel formed between the outer wall of the fixed sleeve and the inclined end face of the mixing expansion tube; jet flow channels of different cross-section types are constructed by using the inner holes and walls of core components such as the low-pressure center tube, which not only can realize the wrapping of high-pressure fluid by low-pressure fluid and promote fluid energy transfer, but also can realize jet flow channel adjustment by replacing core components with different wall surfaces and inner hole configurations, thereby enhancing the adjustment and adaptability of the equipment.

[0008] The present invention provides a high-pressure jet annular gap continuous adjustment mechanism and scheme composed of a combination of thread transmission and gear transmission. The auxiliary adjustment gear shaft is driven to rotate and transmit by an external handwheel, and the front end bolt of the main adjustment gear shaft is driven to rotate, so that the low-pressure center cylinder moves axially, thereby realizing the adjustment of the high-pressure jet annular gap width; the present invention provides a set of locking schemes and corresponding mechanisms that can be used for fixing the adjustment position of the continuous adjustment mechanism. After the handwheel adjustment is completed, the locking pressure block A and the locking pressure block B are tightly pressed against the two end planes of the adjustment handwheel brake disc by bolts, forming a locking mechanism similar to the wheel brake system, so that the adjustment handwheel can no longer rotate, thereby completing the fixation of the adjustment position.

[0009] The technical solution adopted by the present invention is:

[0010] A continuously adjustable intermediate annular gap jet type static ejector mainly consists of a back-tightening nut, an equipment housing, a high-pressure inlet pipe, a regulator, a low-pressure center tube, a fixed sleeve, a low-pressure inlet pipe, a mixing expansion tube and a medium-pressure outlet pipe. The mixing expansion cylinder is located inside the equipment housing, and the back-lock nut is installed inside the equipment housing and is located at one end of the equipment housing, and is used to limit the axial position of the mixing expansion cylinder inside the equipment housing; the fixed sleeve is fixed to the other end of the equipment housing by bolts; the regulator is fixed to the outer end face of the fixed sleeve by bolts and is located outside the equipment housing, and the main adjusting gear shaft inside the regulator is connected to the low-pressure center cylinder through its front end bolt; the low-pressure center cylinder is completely inserted into the fixed sleeve, and its central axis coincides with the axis of the equipment housing, the fixed sleeve and the mixing expansion cylinder; the high-pressure inlet pipe is fixed to the outside of the equipment housing and is connected to the side opening of the fixed sleeve for the passage of high-pressure fluid; the low-pressure inlet pipe and the medium-pressure outlet pipe are respectively fixed to the outside of the equipment housing and the end face close to the back-lock nut, and are used for the passage of low-pressure fluid and the discharge of medium-pressure fluid products, respectively.

[0011] When the device of the present invention is working, high-pressure fluid flows from the high-pressure inlet pipe into the high-pressure jet annular gap formed between the low-pressure center tube and the fixed sleeve, and is accelerated in the annular gap to form a high-speed jet that is ejected into the mixing diffuser; after the low-pressure fluid flows into the device from the low-pressure inlet pipe, part of it directly enters the mixing diffuser through the low-pressure jet annular cavity, and part of it enters the low-pressure central flow channel in the low-pressure center tube through the low-pressure drainage bypass, thereby forming a central low-pressure jet that is ejected into the mixing diffuser. Since the high-pressure jet is located between the two low-pressure fluids and the injection direction is close to parallel to the horizontal axis, it effectively avoids the steering flow loss and wall flow loss caused by the radial injection of the high-pressure jet of the traditional annular gap static ejector; in addition, the inner and outer surfaces of the middle high-pressure annular gap jet in the mixing diffuser are in direct contact with the low-pressure fluid, which can effectively enhance the energy transfer between the fluids, thereby achieving the effect of improving the energy transfer efficiency and compactness of the equipment.

[0012] In the present invention, the outer wall of the low-pressure center tube and the inner wall of the fixed sleeve are used to construct a high-pressure jet annular seam. Since the shapes of the tube walls of the above two core components can be flexibly designed according to the use requirements, and both components are detachable and replaceable components, the present invention has strong adaptability to working conditions such as high-pressure fluid flow and pressure. In the present invention, the outer wall of the fixed sleeve and the end face of the mixing diffusion tube are used to construct a low-pressure annular jet cavity, and the central inner hole of the low-pressure center sleeve is used as the low-pressure central jet flow channel. Since both low-pressure flow channels can be flexibly configured through the design of the tube wall or inner hole, and the core components involved, such as the mixing diffusion tube, can also be replaced, the present invention can effectively reduce the low-pressure jet loss and can realize the flow distribution adjustment of the two different low-pressure flow channels according to the working conditions.

[0013] The present invention utilizes a novel continuous regulator to achieve axial movement of the low-pressure center tube, thereby adjusting the width of the high-pressure intermediate jet annular gap. Because the regulator incorporates a gear transmission mechanism, the bolts on the main adjustment shaft can be rotated via an external handwheel. A flat key prevents the low-pressure center tube from rotating, converting the main adjustment shaft bolt rotation into axial movement of the low-pressure center tube. Because the outer wall generatrix of the low-pressure center tube and the inner wall generatrix of the fixed sleeve, which form the high-pressure jet annular gap, are straight lines, curves, or multiple lines with different angles to the horizontal axis, axial movement of the low-pressure center tube relative to the fixed sleeve can adjust the width of the high-pressure jet annular gap. Compared to conventional static ejectors using adjustable cones and other adjustment mechanisms, the low-pressure center tube of the regulator in the present invention has greater vibration resistance, and the adjustment process does not require equipment disassembly, making the regulator more convenient and flexible to use, and significantly enhancing the adjustment range and adaptability to working conditions. The regulator in the present invention also features a locking mechanism composed of components such as a locking block, which can be fixed at any adjustment position, assisting in achieving continuous adjustment of the jet annular gap.

[0014] The beneficial effects of the present invention are:

[0015] The present invention utilizes an intermediate high-pressure annular jet, maintaining the advantages of annular slot jets, such as high flow rates, thin stream thickness, and rapid energy transfer and equalization. It also avoids the diversion and wall-coupling losses associated with radial injection of high-pressure fluid in conventional annular slot jet static ejectors. This allows for simultaneous entrainment and energy transfer of low-pressure fluid both within and outside the high-pressure annular stream. This jet ejection method achieves higher energy transfer efficiency and significantly improves the compactness of the device.

[0016] In the present invention, the annular flow channel formed between the outer wall of the low-pressure center tube and the inner wall of the fixed sleeve is used as the high-pressure jet annular gap. Not only can the shape and width of the annular gap be adjusted by the flexible configuration of the tube wall, but the annular gap can also be adjusted by replacing relevant core components, thereby enhancing the adaptability of the equipment to different application conditions; the low-pressure jet annular cavity outside the middle high-pressure annular gap is constructed by the tube walls of the fixed sleeve and the mixing expansion tube, and the low-pressure center flow channel is the central inner hole of the low-pressure center tube. Both can be flexibly configured and replaced, thereby helping to reduce low-pressure jet losses and achieve optimal flow ratio distribution of the two low-pressure fluids.

[0017] The present invention sets a low-pressure drainage bypass in the fixed sleeve, and the low-pressure fluid is diverted after entering the equipment, without the need to configure air intake pipes for the two low-pressure flow channels outside the equipment respectively, or to set up an external diversion mechanism. This not only makes full use of the internal space of the equipment and simplifies the equipment structure, but also can realize the adjustment of the bypass flow area by replacing the bypass flow channel configuration or the fixed sleeve.

[0018] The regulator provided in the present invention converts external handwheel rotation into axial movement of the low-pressure central inner cylinder through gear transmission, thereby achieving continuous adjustment and locking of the high-pressure jet annular gap width. This regulator enables precise adjustment based on actual operating conditions without disassembly or component replacement. The components within the regulator also possess high vibration resistance and stability, effectively enhancing the device's adaptability in industrial production applications such as natural gas extraction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a continuously adjustable intermediate annular gap jet-type static ejector of the present invention.

[0020] FIG2(a) and FIG2(b) are respectively a three-dimensional schematic diagram and a cross-sectional schematic diagram of the low-pressure central tube, which is the core component of the equipment in the present invention.

[0021] FIG3( a ) and FIG3 ( b ) are respectively a cross-sectional schematic diagram and a three-dimensional schematic diagram of a fixing sleeve, which is a core component of the device in the present invention.

[0022] Figure 4 It is a structural diagram of the regulator in the present invention.

[0023] Figure 5 It is a three-dimensional structural schematic diagram of the regulator locking mechanism in the present invention.

[0024] In the figure: 1. Back-lock nut; 2. Equipment housing; 3. Intermediate annular high-pressure jet channel; 4. High-pressure inlet pipe; 5. Sealing ring A; 6. Sealing ring B; 7. Regulator; 71. Main adjusting gear shaft; 72. Main adjusting bearing; 73. Main adjusting bearing gland; 74. Secondary adjusting bearing gland; 75. Secondary adjusting gear shaft; 76. Secondary adjusting bearing; 77. Adjusting handwheel; 771. Adjusting handwheel brake disc; 78. Locking block A; 79. Locking block B; 710. Adjusting bolt ; 711 regulator cylinder; 7111 adjustment fixing plate; 712 flat key; 8 low-pressure center tube; 81 low-pressure center tube outer wall; 9 fixed sleeve; 91 low-pressure drainage bypass; 92 fixed sleeve center hole inner wall; 93 fixed sleeve side opening; 94 fixed sleeve outer wall; 10 low-pressure inlet pipe; 11 low-pressure jet annular cavity; 12 low-pressure center flow channel; 13 mixing expansion tube; 133 mixing expansion tube inclined end face; 14 medium-pressure outlet pipe. DETAILED DESCRIPTION

[0025] A typical implementation method of a continuously adjustable intermediate annular gap jet-type static ejector of the present invention is described below, but is not limited to this implementation method.

[0026] like Figure 1As shown, the present invention is a continuously adjustable intermediate annular gap jet type static ejector mainly composed of a backing nut 1, an equipment housing 2, a high-pressure inlet pipe 4, a regulator 7, a low-pressure center tube 8, a fixed sleeve 9, a low-pressure inlet pipe 10, a mixing expansion tube 13 and a medium-pressure outlet pipe 14.

[0027] The mixing expansion cylinder 13 is located inside the equipment housing 2, and the back-lock nut 1 is installed inside the equipment housing 2 and is located at one end of the equipment housing 2, and is used to limit the axial position of the mixing expansion cylinder 13 inside the equipment housing 2; the fixed sleeve 9 is fixed to the other end of the equipment housing 2 by bolts; the regulator 7 is fixed to the outer end face of the fixed sleeve 9 by bolts and is located outside the equipment housing 2, and the main adjusting gear shaft 71 inside the regulator 7 is connected to the low-pressure center cylinder 8 through its front end bolts; the low-pressure center cylinder 8 is completely inserted into the fixed sleeve 9, and its central axis coincides with the axis of the equipment housing 2, the fixed sleeve 9 and the mixing expansion cylinder 13; the high-pressure inlet pipe 4 is fixed to the outside of the equipment housing 2 and is connected to the side opening 93 of the fixed sleeve 9 for the introduction of high-pressure fluid; the low-pressure inlet pipe 10 and the medium-pressure outlet pipe 14 are respectively fixed to the outside of the equipment housing 2 and the end face close to the back-lock nut 1, and are used for the introduction of low-pressure fluid and the discharge of medium-pressure fluid products, respectively.

[0028] The low-pressure center tube 8, whose end close to the mixing expansion tube 13 is the center tube outer wall surface 81, is provided with a center hole in the middle of the low-pressure center tube 8, and the end of the center hole close to the mixing expansion tube 13 is connected with the mixing expansion tube 13; the low-pressure center tube 8, whose side wall surface away from the mixing expansion tube 13 has an opening, and the opening is connected with its center hole; the end surface of the fixed sleeve 9 close to the mixing expansion tube 13 is the fixed sleeve outer wall surface 94, is provided with a center hole in the middle of the fixed sleeve 9, and the inner wall surface of the center hole close to the mixing expansion tube 13 is the fixed sleeve center hole inner wall surface 92, and the end of the center hole close to the mixing expansion tube 13 is connected with the center hole close to the mixing expansion tube 13; a low-pressure drainage bypass 91 is also provided on the surface of the fixed sleeve 9, and the low-pressure drainage bypass 91 is connected with the opening on the side wall of the low-pressure center tube 8 away from the mixing expansion tube 13. The mixing expansion cylinder 13 includes three sections, among which the end close to the fixed sleeve 9 is the inclined end face 133 of the mixing expansion cylinder, and the cylinder diameter gradually decreases from the direction of the fixed sleeve 9. The middle section is a straight cylinder structure, and the end close to the back-tightening nut 1 is the expansion cylinder, that is, the diameter gradually increases toward the direction of the back-tightening nut 1. There are two low-pressure fluid flow channels inside the device of the present invention, one is the low-pressure central flow channel 12 formed by the central through hole of the low-pressure central tube 8 as shown in Figures 2(a) and 2(b), and the other is the low-pressure jet annular cavity 11 formed between the outer wall surface 94 of the fixed sleeve and the inclined end surface 133 of the mixing expansion tube as shown in Figures 3(a) and 3(b), wherein the low-pressure jet annular cavity 11 is directly connected to the low-pressure inlet pipe 10 and the low-pressure drainage bypass 91; the two low-pressure fluid flow channels are both connected to the end of the mixing expansion tube 13 away from the back-tightening nut 1; according to the equipment application conditions and processing volume requirements, the flow cross-sectional area of ​​the low-pressure central flow channel 12 can be adjusted by replacing the low-pressure central tube 8 with different central through hole sizes, and the flow cross-sectional area of ​​the low-pressure jet annular cavity 11 can be adjusted by changing the outer wall surface 94 of the fixed sleeve and the inclined end surface 133 of the mixing expansion tube separately or simultaneously.

[0029] In the device of the present invention, an intermediate annular gap type high-pressure jet flow channel 3 of the equipment is formed between the inner wall surface 92 of the center hole of the fixed sleeve in the fixed sleeve 9 and the outer wall surface 81 of the low-pressure center tube in the low-pressure center tube 8, and the high-pressure jet flow channel 3 is connected to the end of the mixing expansion tube 13 away from the back-tightening nut 1; the flow cross-sectional area of ​​the intermediate annular gap type high-pressure jet flow channel 3 changes from left to right (that is, from the end away from the mixing expansion tube 13 to the end close to the mixing expansion tube 13) in two trends, one is continuous decrease, and the other is first decrease and then increase; the minimum annular gap width range of the intermediate annular gap type high-pressure jet flow channel 3 is 0.1mm~50mm, and the acute angle between its outlet flow channel wall and the center axis of the equipment is in the range of 0~60°.

[0030] The low-pressure drainage bypass 91 in the device of the present invention has two structural forms. One form adopts a single flow channel, and the other form is composed of multiple different flow channels. When the low-pressure drainage bypass 91 adopts a multi-flow channel parallel structure, the number of flow channels ranges from 2 to 20, and the cross-sectional shapes and geometric dimensions of each flow channel can be partially consistent or completely consistent, or can be different. The cross-sectional shapes of each flow channel constituting the low-pressure drainage bypass 91 can be circular, elliptical, rectangular, trapezoidal, fan-shaped, rounded rectangular or rounded trapezoidal, and the length range of the side length or diameter of each flow channel cross section is 1 to 200 mm.

[0031] like Figure 4 As shown, the regulator in the device of the present invention is mainly composed of a main adjusting gear shaft 71, a main adjusting bearing 72, a main adjusting bearing pressure cover 73, a secondary adjusting bearing pressure cover 74, a secondary adjusting gear shaft 75, a secondary adjusting bearing 76, an adjusting handwheel 77, a locking pressure block A78, a locking pressure block B79, an adjusting bolt 710 and a regulator cylinder 711. The main adjusting gear shaft 71 can rotate under the limit constraint of the main adjusting bearing 72, and its center axis coincides with the center axis of the equipment; the main adjusting bearing pressure cover 73 is fixedly connected to the regulator cylinder 711 by bolts, and is used to limit the main adjusting bearing 72; the rightmost stud of the main adjusting gear shaft 71 is screwed into the bolt hole at the leftmost center position of the low-pressure center tube 8; the auxiliary adjusting gear shaft 75 can rotate under the limit constraint of the auxiliary adjusting bearing 76, and its right end gear teeth are engaged with the gear teeth of the main adjusting gear shaft 71, so that the main adjusting gear shaft 71 can rotate under the drive of the auxiliary adjusting gear shaft 75; the auxiliary adjusting bearing pressure cover 74 is fixedly connected to the regulator cylinder 711 by bolts, and is used to limit the auxiliary adjusting bearing 76; the adjusting hand wheel 77 is fixedly connected to the left end of the auxiliary adjusting gear shaft 75, and when the equipment is in use, there is no relative movement or rotation between the two. Figure 5 As shown, the adjusting bolt 710 is fixed to the threaded hole on the adjusting fixing plate 7111 on the regulator cylinder 711, and the front end is screwed into the threaded hole on the locking pressure block B79; the locking pressure block A78 and the locking pressure block B79 are respectively pressed tightly on the left end face and the right end face of the disk at the right end of the section handwheel 77; the locking pressure block A78 is fixedly connected to the locking pressure block B79 by a bolt.

[0032] When the device of the present invention is adjusted using the regulator 7, the auxiliary adjusting gear shaft 75 is rotated by rotating the adjusting hand wheel 77, and the main adjusting gear shaft 71 is driven to rotate; a flat key 712 is provided between the low-pressure center tube 8 and the fixed sleeve 9, which is used to limit the low-pressure center tube 8 from rotating, thereby converting the rotational action of the front end bolt of the main adjusting gear shaft 71 into a pulling action on the low-pressure center tube 8, so that the low-pressure center tube 8 can move axially along the center line of the equipment, changing the positional relationship between the outer wall surface 81 of the low-pressure center tube and the inner wall surface 92 of the center hole of the fixed sleeve, thereby realizing the width adjustment of the intermediate annular gap type high-pressure jet flow channel 3; the transmission ratio range of the auxiliary adjusting gear shaft 75 and the main adjusting gear shaft 71 is 1.1:1~50:1; the diameter range of the front end bolt of the main adjusting gear shaft 71 is 5mm~64mm, and the pitch range is 0.5mm~6mm.

[0033] The regulator 7 in the device of the present invention can realize continuous adjustment of the position of the low-pressure center tube 8, thereby realizing continuous adjustment of the width of the intermediate annular gap type high-pressure jet flow channel 3; after the adjustment operation is completed using the regulator 7, the locking pressure block A78, the locking pressure block B79 and the adjusting bolt 710 are used to lock the rotating adjustment hand wheel 77, thereby fixing the size of the intermediate annular gap type high-pressure jet flow channel 3. The specific locking method is: first, the locking pressure block B79 is pressed against the right end face of the adjusting hand wheel brake disc 771 by rotating the adjusting bolt 710, and the pin at the right end of the locking pressure block B79 is inserted into the corresponding pin hole on the adjusting fixing plate 7111, so that the locking pressure block Block B79 cannot rotate, so rotating the adjusting bolt 710 can move the locking pressure block B79 left and right; then place the locking pressure block A78 on the left side of the right end disc of the adjusting handwheel 77, and fix it to the locking pressure block B79 by bolts, so that the locking pressure block A78 presses the left end face of the adjusting handwheel brake disc 771; in the clamping state, the locking pressure block A78, the locking pressure block B79 and the adjusting handwheel brake disc 771 form a wheel brake mechanism similar to that of the wheel, and the friction force generated between the locking pressure block and the brake disc is used to lock the adjusting handwheel 77, thereby fixing the position of the low-pressure center tube 8 and the width of the middle annular gap type high-pressure jet flow channel 3.

[0034] The regulator 7 in the device of the present invention can be equipped with both a locking pressure block A78 and a locking pressure block B79, or can be equipped with only a locking pressure block B79; a sealing ring A5 and a sealing ring B6 are provided on the outer wall of the low-pressure center tube 8, which are respectively located on the left and right sides of the connecting port between the low-pressure drainage bypass 91 and the low-pressure center flow channel 12, and are used to ensure that the high-pressure gas does not leak into the low-pressure fluid flow path.

Claims

1. A continuously adjustable intermediate annular gap jet type static ejector, characterized in that: The continuously adjustable intermediate annular gap jet-type static ejector mainly consists of a back-tightening nut (1), an equipment housing (2), a high-pressure inlet pipe (4), a regulator (7), a low-pressure center tube (8), a fixed sleeve (9), a low-pressure inlet pipe (10), a mixing expansion tube (13) and a medium-pressure outlet pipe (14); The mixing expansion cylinder (13) is located inside the device housing (2); the back-tightening nut (1) is installed inside the device housing (2) and is located at one end of the device housing (2) and is used to limit the axial position of the mixing expansion cylinder (13) inside the device housing (2); the fixed sleeve (9) is fixed to the other end of the device housing (2) by bolts; the regulator (7) is fixed to the outer end surface of the fixed sleeve (9) by bolts and is located outside the device housing (2); the main regulating gear shaft (71) inside the regulator (7) is connected to the low-pressure center cylinder (8) through its front end bolts. The low-pressure center tube (8) is completely inserted into the interior of the fixed sleeve (9), and its central axis coincides with the axis of the equipment housing (2), the fixed sleeve (9) and the mixing expansion tube (13); the high-pressure inlet pipe (4) is fixed to the outside of the equipment housing (2) and is connected to the side opening (93) of the fixed sleeve (9) for the introduction of high-pressure fluid; the low-pressure inlet pipe (10) and the medium-pressure outlet pipe (14) are respectively fixed to the outside of the equipment housing (2) and the end face close to the back-tightening nut (1), for the introduction of low-pressure fluid and the discharge of medium-pressure fluid products respectively; The low-pressure center tube (8) has an outer wall surface (81) of the center tube close to the mixing expansion tube (13), and a center hole is provided in the middle of the low-pressure center tube (8), and the end of the center hole close to the mixing expansion tube (13) is connected to the mixing expansion tube (13); the low-pressure center tube (8) has an opening on the side wall surface of the end away from the mixing expansion tube (13), and the opening is connected to the center hole; the end surface of the fixed sleeve (9) close to the mixing expansion tube (13) is the outer wall surface (94) of the fixed sleeve, and the middle of the fixed sleeve (9) is provided with a center hole. The inner wall surface of the center hole close to the mixing expansion cylinder (13) is the inner wall surface (92) of the center hole of the fixed sleeve, and the end of the center hole close to the mixing expansion cylinder (13) is connected to the center hole close to the mixing expansion cylinder (13); the surface of the fixed sleeve (9) is also provided with a low-pressure drainage bypass (91), and the end of the low-pressure drainage bypass (91) away from the mixing expansion cylinder (13) is connected to the side wall opening of the low-pressure center cylinder (8); the mixing expansion cylinder (13) includes three sections, wherein the end close to the fixed sleeve (9) is the inclined end surface (133) of the mixing expansion cylinder, The diameter of the cylinder gradually decreases from the direction of the fixed sleeve (9), the middle section is a straight cylinder structure, and the end close to the back-tightening nut (1) is an expansion cylinder, that is, the diameter gradually increases toward the direction of the back-tightening nut (1); the continuously adjustable intermediate annular gap jet type static ejector has two low-pressure fluid flow channels, one of which is a low-pressure central flow channel (12) formed by the central hole of the low-pressure central cylinder (8), and the other is a low-pressure jet annular cavity (11) formed between the outer wall surface (94) of the fixed sleeve and the inclined end surface (133) of the mixing expansion cylinder, wherein the low-pressure jet annular cavity (11) and The low-pressure inlet pipe (10) and the low-pressure drainage bypass (91) are directly connected; the two low-pressure fluid flow channels are both connected to the end of the mixing expansion tube (13) away from the back-tightening nut (1); according to the application conditions of the equipment and the processing volume requirements, the flow cross-sectional area of ​​the low-pressure central flow channel (12) can be adjusted by replacing the low-pressure central tube (8) with a different central through-hole size, and the flow cross-sectional area of ​​the low-pressure jet annular cavity (11) can be adjusted by changing the outer wall surface (94) of the fixed sleeve and the inclined end surface (133) of the mixing expansion tube separately or simultaneously; An annular gap-type high-pressure jet flow channel (3) is formed between the inner wall surface (92) of the central hole of the fixed sleeve (9) and the outer wall surface (81) of the low-pressure central tube (8) in the low-pressure central tube (8), and the high-pressure jet flow channel (3) is connected to the end of the mixing expansion tube (13) away from the back-tightening nut (1); The regulator (7) can realize continuous adjustment of the position of the low-pressure central tube (8), thereby realizing continuous adjustment of the width of the intermediate annular gap type high-pressure jet flow channel (3).

2. The continuously adjustable intermediate annular gap jet static ejector according to claim 1, characterized in that: The flow cross-sectional area of ​​the intermediate annular gap type high-pressure jet flow channel (3) has two changing trends from left to right, that is, from the end far away from the mixing expansion cylinder (13) to the end close to the mixing expansion cylinder (13), one of which is continuous decrease, and the other is first decrease and then increase; the minimum annular gap width of the intermediate annular gap type high-pressure jet flow channel (3) ranges from 0.1 mm to 50 mm, and the acute angle between the outlet flow channel wall and the central axis of the continuously adjustable intermediate annular gap jet type static ejector ranges from 0 to 60 degrees.

3. A continuously adjustable intermediate annular gap jet-type static ejector according to claim 1 or 2, characterized in that: The low-pressure drainage bypass (91) has two structural forms, one of which is to adopt a single flow channel, and the other is to be composed of multiple flow channels in parallel; when the low-pressure drainage bypass (91) adopts a multi-flow channel parallel structure, the number of flow channels ranges from 2 to 20, and the cross-sectional shapes and geometric dimensions of each flow channel are partially consistent or completely consistent, or different; the cross-sectional shapes of each flow channel constituting the low-pressure drainage bypass (91) are circular, elliptical, rectangular, trapezoidal, fan-shaped, rounded rectangular or rounded trapezoidal, and the length of the side length or diameter of each flow channel cross section ranges from 1 to 200 mm.

4. The continuously adjustable intermediate annular gap jet static ejector according to claim 1, characterized in that: The regulator (7) is mainly composed of a main regulating gear shaft (71), a main regulating bearing (72), a main regulating bearing pressure cover (73), a secondary regulating bearing pressure cover (74), a secondary regulating gear shaft (75), a secondary regulating bearing (76), an adjusting hand wheel (77), a locking pressure block A (78), a locking pressure block B (79), an adjusting bolt (710) and a regulator cylinder (711); The main adjusting gear shaft (71) can rotate under the limit constraint of the main adjusting bearing (72), and its central axis coincides with the central axis of the continuously adjustable intermediate annular gap jet-type static ejector; the main adjusting bearing pressure cover (73) is fixedly connected to the regulator cylinder (711) by bolts, and is used to limit the main adjusting bearing (72); the stud at one end of the main adjusting gear shaft (71) is screwed into the bolt hole at the center position of the end of the low-pressure center tube (8); the auxiliary adjusting gear shaft (75) can rotate under the limit constraint of the auxiliary adjusting bearing (76), and the gear teeth at one end of the auxiliary adjusting gear shaft (71) are meshed with the gear teeth of the main adjusting gear shaft (71), so that the main adjusting gear shaft (71) can rotate under the drive of the auxiliary adjusting gear shaft (75); the auxiliary adjusting bearing pressure cover (74) is fixedly connected to the regulator cylinder (711) by bolts, and is used to limit the auxiliary adjusting bearing (76); the adjusting hand wheel (77) is fixedly connected to the other end of the auxiliary adjusting gear shaft (75). When in use, the two No relative movement or rotation occurs between the adjusting bolts (710); the adjusting bolt (710) is fixed to the threaded hole on the adjusting fixing plate (7111) on the regulator cylinder (711), and the front end is screwed into the threaded hole on the locking pressure block B (79); the locking pressure block A (78) and the locking pressure block B (79) are respectively pressed against the left and right end surfaces of the adjusting hand wheel brake disc (771) of the section hand wheel (77); the locking pressure block A (78) is fixedly connected to the locking pressure block B (79) by a bolt.

5. The continuously adjustable intermediate annular gap jet static ejector according to claim 4, characterized in that: When the regulator (7) is used for adjustment, the auxiliary adjustment gear shaft (75) is rotated by rotating the adjustment hand wheel (77), and the main adjustment gear shaft (71) is driven to rotate; a flat key (712) is provided between the low-pressure center tube (8) and the fixed sleeve (9) for limiting the low-pressure center tube (8) from rotating, thereby converting the rotation effect of the front end bolt of the main adjustment gear shaft (71) into a pulling effect on the low-pressure center tube (8), so that the low-pressure center tube (8) can move axially along the center line of the continuously adjustable intermediate annular gap jet type static ejector, changing the positional relationship between the outer wall surface (81) of the low-pressure center tube and the inner wall surface (92) of the center hole of the fixed sleeve, thereby realizing the width adjustment of the intermediate annular gap type high-pressure jet flow channel (3); the transmission ratio range of the auxiliary adjustment gear shaft (75) and the main adjustment gear shaft (71) is 1.1:1~50:1; the diameter range of the front end bolt of the main adjustment gear shaft (71) is 5 mm~64 mm, and the pitch range is 0.5 mm~6 mm.

6. A continuously adjustable intermediate annular gap jet-type static ejector according to claim 4 or 5, characterized in that: After the adjustment operation is completed by using the regulator (7), the locking pressure block A (78), the locking pressure block B (79) and the adjusting bolt (710) are used to lock the rotating adjustment hand wheel (77), thereby fixing the size of the intermediate annular gap type high-pressure jet flow channel (3). The specific locking method is as follows: first, the locking pressure block B (79) is pressed against the right end surface of the adjustment hand wheel brake disc (771) by rotating the adjusting bolt (710). Since the right end pin of the locking pressure block B (79) is inserted into the corresponding pin hole on the adjustment fixing plate (7111), the locking pressure block B (79) cannot be rotated. The locking block B (79) is rotated, and thus the adjusting bolt (710) is rotated to move the locking block B (79) left and right; then the locking block A (78) is placed on the left side of the adjusting hand wheel brake disc (771), and is fixedly connected to the locking block B (79) by a bolt, so that the locking block A (78) presses the left end face of the adjusting hand wheel brake disc (771); in the clamping state, the adjusting hand wheel (77) is locked by the friction force generated between the locking block and the brake disc, thereby fixing the position of the low-pressure center tube (8) and the width of the intermediate annular gap type high-pressure jet flow channel (3).

7. A continuously adjustable intermediate annular gap jet-type static ejector according to claim 4 or 5, characterized in that: The regulator (7) can be equipped with both a locking pressure block A (78) and a locking pressure block B (79), or only a locking pressure block B (79); a sealing ring A (5) and a sealing ring B (6) are provided on the outer wall of the low-pressure central tube (8), and the two sealing rings are respectively located on both sides of the connection port between the low-pressure drainage bypass (91) and the low-pressure central flow channel (12), so as to ensure that the high-pressure gas does not leak into the low-pressure fluid flow path.

Images