Steam ejector with adjustable nozzle caliber

Abstract

The steam ejector comprises a hollow steam receiving chamber and a Venturi tube, a nozzle assembly is arranged in the steam receiving chamber and comprises an outer layer tube and a deformable inner layer tube, the outer layer tube is coaxially arranged outside the inner layer tube in a sleeving mode, and the Venturi tube is arranged in the inner layer tube in a sleeving mode. The two ends of the outer-layer pipe are fixedly connected with the two ends of the inner-layer pipe respectively, a deformation gap is formed between the inner-layer pipe and the outer-layer pipe, an adjusting assembly is arranged at the upper end of the steam receiving chamber, one end of the adjusting assembly extends into the deformation gap and controls the inner-layer pipe to deform through a collecting part, one end of the Venturi pipe communicates with the steam receiving chamber, and the other end of the Venturi pipe communicates with the inner-layer pipe. And the mixing device is used for mixing and discharging the high-parameter steam and the low-parameter steam. By controlling deformation of the inner-layer pipe, the device can adjust the caliber according to actual working conditions, the online working state of the whole steam ejector is guaranteed, and therefore economic benefits are improved.

Description

Technical Field

[0001] The present application relates to the technical field of steam injectors, and in particular to a steam injector with an adjustable nozzle diameter. Background Art

[0002] Steam ejectors are widely used in steam-powered industries such as electricity, chemical industry, textile, food, papermaking, petroleum, and thermal power. They are mainly used to increase the pressure of low-parameter steam and recover industrial waste heat. That is, higher-pressure steam is used to inject lower-pressure steam to obtain steam at an intermediate pressure, such as improving heating steam parameters, recovering steam waste heat, and recovering flash steam from high-temperature condensate, thereby achieving significant energy-saving effects.

[0003] When the steam ejector is working, high-parameter steam flows into the steam ejector, expands and accelerates in the nozzle, the kinetic energy increases, the pressure decreases, and a supersonic steam flow is generated, so that a negative pressure area is formed in the cavity around the nozzle, and low-parameter steam is drawn into the steam ejector for mixing. The two parameter steams are fully mixed in the diffuser, decelerated and pressurized to become medium-pressure steam and discharged.

[0004] Early steam ejectors had a simple structure and the nozzle diameter could not be adjusted. Later, with the update of technology, ejectors with adjustable nozzle diameter gradually became a current research hotspot. However, when adjusting the diameter of most steam ejectors, an adjustment structure built into the nozzle is required to adjust the nozzle diameter. This adjustment method has problems such as poor adjustment linearity and easy jamming and wear of the adjustment device. Summary of the Invention

[0005] The present application provides a steam ejector with adjustable nozzle caliber, which can solve the problems of poor linearity of caliber change during adjustment and easy jamming and wear of the adjustment device in existing steam ejectors with online caliber adjustment.

[0006] The technical solution of the present application is as follows: A steam ejector with adjustable nozzle diameter, comprising: A steam receiving chamber with a hollow interior, the steam receiving chamber is used to receive high-parameter steam and low-parameter steam, a nozzle assembly is provided inside the steam receiving chamber, the nozzle assembly includes an outer tube and a deformable inner tube, the outer tube is coaxially sleeved outside the inner tube, the two ends of the outer tube are respectively connected and fixed to the two ends of the inner tube, a deformation gap is provided between the inner tube and the outer tube, an adjustment assembly is provided at the upper end of the steam receiving chamber, one end of the adjustment assembly extends into the deformation gap, and the deformation of the inner tube is controlled by a convergence member; A venturi tube, one end of which is connected to the steam receiving chamber, is used for mixing high-parameter steam and low-parameter steam and discharging them.

[0007] By adopting the above scheme, by setting coaxially nested outer tubes and inner tubes, by setting a deformable inner tube, and using a contraction piece to constrain the inner tube and control its shrinkage, it is possible to adjust the flow of steam flowing through the inner tube by changing the diameter of the inner tube without affecting the reception of steam, so that the steam flowing out of the inner tube can better inject low-parameter steam, thereby completing the mixing of steam. At the same time, when adjusting the diameter according to actual working conditions to mix steam, the entire steam ejector can be kept in an online working state. The structure of the inner tube can be changed through external adjustment components and contractions, and there is no need to reach into the inner tube to adjust the diameter of the inner tube, so that the diameter change of the entire inner tube is more linear.

[0008] In one embodiment of the present application, the steam receiving chamber comprises: a first steam inlet pipe, the first steam inlet pipe being used to receive high-parameter steam, one end of the first steam inlet pipe being in communication with the nozzle assembly, and one end of the nozzle assembly being in communication with the steam receiving chamber; The second steam inlet pipe is used to receive low-parameter steam, and the second steam inlet pipe is connected to the steam receiving chamber.

[0009] By adopting the above solution, two pipes are set up inside the steam receiving chamber, so that high-parameter steam and low-parameter steam can enter the steam receiving chamber from the corresponding first steam pipe and second steam pipe respectively. The high-parameter steam received by the first steam inlet pipe can be accelerated by the nozzle assembly and ejected at a supersonic speed. At the same time, the nozzle assembly is connected to the Venturi tube, so that the high-parameter steam ejected at a supersonic speed forms a negative pressure environment in the steam receiving chamber, which can more quickly and conveniently evoke low-parameter steam, so that the two can be mixed in the Venturi tube.

[0010] In one embodiment of the present application, the inner walls of both ends of the outer tube are embedded with assembly rings; The inner tube includes a plurality of flexible spring sheets arranged inside the outer tube, and the plurality of flexible spring sheets are surrounded by each other to form a columnar inner channel. The outer wall on one side of the flexible spring sheet is provided with a first arc-shaped chamfered surface, and the inner wall on the other side is provided with a second arc-shaped chamfered surface. The first arc-shaped chamfered surface of the flexible spring sheet and the second arc-shaped chamfered surface of the adjacent flexible spring sheet are in contact with each other and stacked.

[0011] By adopting the above scheme, an inner tube composed of multiple flexible spring sheets is used, and the two sides of each flexible spring sheet are stacked in sequence along the circumferential direction to form a columnar inner channel. Since the flexible spring sheet itself can undergo elastic deformation under the action of external force, in addition, while deforming, the stacked parts can provide a certain amount of deformability, thereby ensuring that steam can flow through the inner tube along the steam inlet direction, and thus the device can adjust the diameter of the inner tube online.

[0012] In one embodiment of the present application, the Venturi tube is an hourglass-shaped component, and the Venturi tube includes a contraction portion, a throat portion and a diffusion portion. The contraction portion, throat portion and diffusion portion are arranged in sequence along the direction of steam flow and are connected to each other. One end of the contraction portion is connected to the steam receiving chamber.

[0013] By adopting the above scheme, by setting the Venturi tube into an hourglass shape, after the accelerated high-parameter steam ejects the low-parameter steam, the two steams can be mixed in the Venturi tube, and the mixed steam is further expanded and mixed in the Venturi tube, thereby achieving the purpose of ejecting low-parameter steam and increasing its pressure and temperature, thereby increasing the utilization rate of the low-parameter steam.

[0014] In one embodiment of the present application, the plurality of flexible spring sheets are divided into at least two groups that surround each other, at least two groups of flexible spring sheets are coaxially arranged to form the inner layer tube, and the contact positions of the first arc chamfered surface and the second arc chamfered surface in at least two groups of flexible spring sheets are staggered with each other.

[0015] By adopting the above-mentioned scheme, by dividing the flexible spring sheets into two groups, and coaxially sleeved the two groups of flexible spring sheets together, and by staggering the parts of the two groups of flexible spring sheets that are in contact with each other and stacked, when the inner tube composed of at least two layers of flexible spring sheets is used to speed up high-parameter steam, its own sealing performance is better, and it will not affect the convenience of the device in adjusting the diameter of the inner tube.

[0016] In one embodiment of the present application, the adjustment component further includes: a telescopic driving member, the telescopic driving member being assembled in the steam receiving chamber, the driving shaft of the telescopic driving member passing through the steam receiving chamber and extending into the deformation gap, the driving shaft of the telescopic driving member being connected and fixed to the constricting member to pull the constricting member to move in a vertical direction; A limiting plate, wherein a circular through hole is opened in the middle of the limiting plate, and two limiting plates are provided. The two limiting plates are assembled on the inner wall of the outer layer tube and are perpendicular to the radial direction of the outer layer tube. The two limiting plates are respectively arranged on both sides of the inner layer tube, and the two ends of the constricting member respectively pass through the circular through holes.

[0017] By adopting the above-mentioned scheme, a telescopic driving member is used to connect the driving shaft of the telescopic driving member with the contracting member, so that the contracting member can automatically contract when subjected to traction, and drive the flexible spring sheets that surround each other to contract. When the diameter of the inner tube needs to be expanded, the contracting member is released, and the elastic force of the flexible spring sheets themselves is used to restore the elastic deformation, so that the device can quickly and efficiently achieve the change of the diameter of the inner tube using a single telescopic driving member.

[0018] In one embodiment of the present application, the constricting member includes: At least two groups of flexible constricting belts, at least two groups of said flexible constricting belts are spaced apart along the length direction of said inner layer tube and wound around the outside of said inner layer tube, at least two groups of said flexible constricting belts have different winding directions, one end of said flexible constricting belt passes through the circular through hole below said inner layer tube and is connected to the outer wall of said outer layer tube, and the other end of said flexible constricting belt passes through the circular through hole above said inner layer tube and is fixedly connected to the driving shaft of said telescopic driving member.

[0019] By adopting the above scheme, the flexible constricting belt is constrained by the circular through hole on the limit plate, so that when the flexible constricting belt is wrapped around the outside of the inner tube and pulled by the telescopic drive member, the force applied to the flexible constricting belt is more concentrated, ensuring that the movement trajectory of the flexible constricting belt is more standardized. At the same time, by setting at least two groups of flexible constricting belts with different winding directions, when the device uses the flexible constricting belt to constrain the contraction of the inner tube, the force applied to each flexible elastic sheet is more uniform, ensuring that the axial position of the inner tube remains unchanged. Without destroying the internal flow field of the inner tube, the cross-sectional area can be continuously adjusted, the high-parameter steam inlet flow rate can be adjusted, and the caliber can be linearly adjusted.

[0020] In one embodiment of the present application, the flexible constricting belt controls the deformation of the inner tube by tightening, so that a contraction section, a throat and an expansion section are formed inside the inner tube along the steam inlet direction. The contraction section is used to accelerate the high-parameter steam once, and the expansion section is used to accelerate the high-parameter steam twice. The diameter d of the throat, the diameter r of the outer tube and the inner ring diameter h of the assembly ring satisfy: r≥4 / 3d, d≤0.9h.

[0021] By adopting the above-mentioned scheme, the driving member is used to drive the flexible contraction belt to contract, so that the inner tube can form a contraction section, a throat and an expansion section distributed along the steam inlet direction under the action of the contraction force. Among them, by limiting the range of the diameter of the throat, the diameter of the outer tube and the inner ring diameter of the assembly ring during the adjustment process, the device can limit the deformation of the inner tube when adjusting the caliber, thereby controlling the adjustment amount of the caliber.

[0022] In one embodiment of the present application, a seal is further included. Two seals are provided and respectively assembled on the outer walls of both sides of the outer tube. The two seals are sealingly assembled at one end of the flexible contracting belt and the driving shaft of the telescopic driving member.

[0023] By adopting the above solution and using a seal, when the inner tube is adjusted with a flexible constricting band, the seal is assembled at the position where the flexible constricting band passes through the outer tube, thereby effectively improving the sealing performance of the entire nozzle assembly.

[0024] A second object of the present invention is to provide a steam injection system.

[0025] In order to achieve the above-mentioned purpose, the technical solution of the present application is as follows: A steam injection system includes a steam injector with an adjustable nozzle diameter.

[0026] By adopting the above solution, the nozzle assembly with adjustable caliber is arranged in the steam injection system, so that the entire steam injection system can linearly adjust the flow rate and pressure of the mixed steam injection according to the needs of actual working conditions.

[0027] In summary, this application includes at least one of the following beneficial technical effects: 1. By adopting a nozzle assembly, an outer tube and a deformable inner tube are assembled to form a nozzle assembly, so that the shape and diameter of the inner tube are changed during the deformation process to form an hourglass shape that is narrow in the middle and wide on both sides. At the same time, this key is that when changing the deformation and caliber, there is no need to shut down the entire steam system to achieve the purpose of online caliber adjustment. Since the convergence part and the adjustment component are both arranged on the outside of the inner tube, it will not affect the circulation of steam inside the inner tube, making the entire adjustment process linear, and the adjustment components will not be stuck or damaged, thereby improving economic benefits. It also enables the device to adjust the caliber according to actual working conditions, change the flow rate of high-parameter steam when it is ejected, so that it can inject low-parameter steam and mix it.

[0028] 2. By adopting at least two groups of flexible restraining belts, multiple flexible spring sheets stacked on each other's sides are gathered. Since at least two groups of flexible restraining belts are on the outside of the inner tube and are wound in different directions, when being pulled by the same telescopic driving member, the flexible restraining belts will be able to produce uniform circumferential extrusion on the flexible spring sheets that are surrounded by each other, so that the flexible spring sheets are more stable when contracted, the axial position of the inner tube remains unchanged, and the caliber of the inner tube can also be changed more linearly. In addition, by connecting at least two groups of flexible restraining belts to the drive shaft of the telescopic driving member, the adjustment method is simpler and more efficient, and the economic benefits are also higher.

[0029] 3. By setting a Venturi tube, setting the Venturi tube on one side of the steam receiving chamber, and connecting the Venturi tube and the steam receiving chamber to each other, and setting the Venturi tube into an hourglass shape, the mixed steam can expand and accelerate in the hourglass-shaped Venturi tube, so that the mixed steam has a higher flow rate and pressure when it is ejected from the steam ejector, thereby improving the utilization efficiency of steam. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a front cross-sectional view of a steam ejector with adjustable nozzle diameter provided in the first embodiment of the present application; Figure 2 This is a front cross-sectional view of an inner tube of a steam ejector with adjustable nozzle aperture provided in the first embodiment of the present application; Figure 3 This is a front view of an inner tube of a steam ejector with adjustable nozzle diameter provided in the first embodiment of the present application; Figure 4 This is a front view of an inner tube of a steam ejector with adjustable nozzle diameter provided in a second embodiment of the present application; Figure 5 This is a front view of a flexible constricting belt for a steam ejector with adjustable nozzle diameter provided in the first embodiment of the present application; Figure 6 This is a front view of an outer tube of a steam ejector with adjustable nozzle aperture provided in the first embodiment of the present application; Figure 7 This is a front view of the inner tube of a steam ejector with adjustable nozzle diameter provided by the first embodiment of the present application in a high flow rate working state; Figure 8 This is a front view of the inner tube of a steam ejector with adjustable nozzle aperture provided by the first embodiment of the present application in a flow rate working state; Figure 9 This is a front view of the inner tube of a steam ejector with adjustable nozzle aperture provided in the first embodiment of the present application in a low-flow working state.

[0031] Explanation of the accompanying drawings: 11. Steam receiving chamber; 111. First steam inlet pipe; 112. Second steam inlet pipe; 12. Nozzle assembly; 121. Outer tube; 1211. Assembly ring; 122. Inner tube; 1221. Flexible spring; 1222. Inner channel; 1223. First arc-shaped chamfered surface; 1224. Second arc-shaped chamfered surface; 1225. Contraction section; 1226. Throat; 1227. Expansion section; 123. Deformation gap; 13. Adjustment assembly; 131. Telescopic drive member; 132. Limiting plate; 1321. Circular through hole; 14. Converging member; 141. Flexible converging belt; 15. Venturi tube; 151. Contraction portion; 152. Throat; 153. Diffuser; 16. Sealing member. DETAILED DESCRIPTION

[0032] The following is combined with Figures 1-9 The steam ejector with adjustable nozzle diameter provided in the present application is described in further detail.

[0033] A steam ejector with an adjustable nozzle diameter provided in an embodiment of the present application includes: a steam receiving chamber 11 with a hollow interior and a venturi tube 15 .

[0034] Example 1, please refer to Figure 1 and Figure 2 The steam receiving chamber 11 is used to receive high-parameter steam and low-parameter steam. A nozzle assembly 12 is provided inside the steam receiving chamber 11. The nozzle assembly 12 includes an outer tube 121 and a deformable inner tube 122. The outer tube 121 is coaxially sleeved on the outside of the inner tube 122. The two ends of the outer tube 121 are respectively connected and fixed to the two ends of the inner tube 122. A deformation gap 123 is provided between the inner tube 122 and the outer tube 121. An adjusting assembly 13 is provided at the upper end of the steam receiving chamber 11. One end of the adjusting assembly 13 extends into the deformation gap 123, and the deformation of the inner tube 122 is controlled by the constricting member 14. The Venturi One end of the inner tube 15 is connected to the steam receiving chamber 11, and is used to mix high-parameter steam and low-parameter steam and discharge them. By setting a deformable inner tube 122 and using the convergence member 14 to control its contraction, it can adjust the diameter according to actual working conditions to mix the steam, so that the entire steam ejector can remain in an online working state. Since the device uses an external adjustment component 13 to drive the convergence member 14 to perform convergence adjustment when adjusting the diameter, when the diameter of the inner tube 122 changes, the steam flow rate circulating inside only changes due to the change in the diameter of the inner tube 122, making the steam flow change more linear, and the adjustment is smoother and less prone to blockage.

[0035] See also Figure 1The steam receiving chamber 11 includes: a first steam inlet pipe 111 and a second steam inlet pipe 112, the first steam inlet pipe 111 is used to receive high-parameter steam, one end of the first steam inlet pipe 111 is connected to the nozzle assembly 12, and one end of the nozzle assembly 12 is connected to the steam receiving chamber 11, the second steam inlet pipe 112 is used to receive low-parameter steam, and the second steam inlet pipe 112 is connected to the steam receiving chamber 11. By integrating two relatively independent pipelines for receiving high-parameter steam and low-parameter steam respectively inside the steam receiving chamber 11, the supersonic high-parameter steam ejected from the nozzle assembly 12 can more quickly and conveniently evoke low-parameter steam, so that the two can be mixed in the venturi tube 15.

[0036] See also Figure 6 , the inner walls of both ends of the outer tube 121 are embedded with assembly rings 1211, the inner tube 122 includes a plurality of flexible spring pieces 1221 arranged inside the outer tube 121, and the plurality of flexible spring pieces 1221 are surrounded by each other to form a columnar inner channel 1222, and the outer wall of one side of the flexible spring piece 1221 is provided with a first arc chamfered surface 1223, and the inner wall of the other side is provided with a second arc chamfered surface 1224, and the first arc chamfered surface 1223 of the flexible spring piece 1221 is in contact with the corresponding The second arc-shaped chamfered surfaces 1224 of the adjacent flexible spring sheets 1221 are in contact with each other and stacked. By adopting an inner tube 122 composed of multiple flexible spring sheets 1221, the inner tube 122 itself can undergo elastic deformation under the action of external force. At the same time, a certain amount of deformability can be provided at the first arc-shaped chamfered surface 1223 and the second arc to the foot surface, thereby ensuring that steam can flow through the inner tube 122 along the steam inlet direction, and thus the device can adjust the diameter of the inner tube 122 online.

[0037] In this embodiment, the flexible elastic sheet 1221 may be a titanium alloy metal sheet.

[0038] See also Figure 1 The venturi tube 15 is an hourglass-shaped component. The venturi tube 15 includes a contraction portion 151, a throat portion 152 and a diffuser portion 153. The contraction portion 151, the throat portion 152 and the diffuser portion 153 are arranged in sequence along the gas outlet direction and are connected to each other. One end of the contraction portion 151 is connected to the steam receiving chamber 11. By setting the venturi tube 15 to be hourglass-shaped, after the accelerated high-parameter steam ejects the low-parameter steam, the two steams can be mixed in the venturi tube 15 and further expanded and accelerated, thereby making the steam injection more efficient.

[0039] Example 2: The structure of Example 2 is basically the same as that of Example 1, except that: See also Figure 4 and Figure 5, the multiple flexible spring sheets 1221 are divided into at least two groups that surround each other, at least two groups of the flexible spring sheets 1221 are coaxially arranged to form the inner tube 122, and the contact positions of the first arc chamfered surface 1223 and the second arc chamfered surface 1224 in at least two groups of the flexible spring sheets 1221 are staggered with each other. By dividing the flexible spring sheets 1221 into two groups, when the inner tube 122 composed of at least two layers of flexible spring sheets 1221 is used to speed up high-parameter steam, its own sealing performance is better, and it will not affect the convenience of the device in adjusting the caliber of the inner tube 122.

[0040] See also Figure 7 、 Figure 8 and Figure 9 The adjusting assembly 13 further includes: a telescopic driving member 131 and a limiting plate 132. The telescopic driving member 131 is assembled in the steam receiving chamber 11. The driving shaft of the telescopic driving member 131 passes through the steam receiving chamber 11 and extends into the deformation gap 123. The driving shaft of the telescopic driving member 131 is connected and fixed to the binding member 14 to pull the binding member 14 to move in the vertical direction. A circular through hole 1321 is opened in the middle of the limiting plate 132. Two limiting plates 132 are provided. The two limiting plates 132 are assembled on the outer On the inner wall of the inner tube 121, and perpendicular to the radial direction of the outer tube 121, the two limit plates 132 are respectively arranged on both sides of the inner tube 122, and the two ends of the restraining member 14 pass through the circular through holes 1321 respectively. By adopting the telescopic driving member 131 and connecting the driving shaft of the telescopic driving member 131 with the restraining member 14, the restraining member 14 can automatically shrink when subjected to a unidirectional traction force, and drive the mutually enclosed flexible spring sheets 1221 to shrink, so that the device can quickly and efficiently realize the change of the caliber of the inner tube 122.

[0041] In this embodiment, the telescopic driving member 131 may be an electric push rod or a pneumatic cylinder.

[0042] See also Figure 3 、 Figure 7 、 Figure 8 and Figure 9The tightening member 14 includes: at least two groups of flexible tightening belts 141, at least two groups of flexible tightening belts 141 are arranged at intervals along the length direction of the inner tube 122 and are wound around the outside of the inner tube 122, and at least two groups of flexible tightening belts 141 have different winding directions. One end of the flexible tightening belt 141 passes through the circular through hole 1321 located below the inner tube 122 and is connected to the outer wall of the outer tube 121, and the other end of the flexible tightening belt 141 passes through the circular through hole 1321 located above the inner tube 122 and is fixedly connected to the driving shaft of the telescopic driving member 131. By setting at least two groups of flexible tightening belts 141 with different winding directions, when the device uses the flexible tightening belt 141 to constrain the contraction of the inner tube 122, the force applied to each flexible elastic sheet is more uniform, so as to ensure that when adjusting the caliber of the inner tube 122, it is more continuous and the adjustment effect is more precise and controllable.

[0043] In this embodiment, the flexible constricting belt 141 can be a steel belt. After one end of the flexible constricting belt 141 passes through the circular through hole 1321 located below, it is connected and fixed to the outer wall of the outer tube 121. When the other end passes through the inner tube 122, it can be wrapped in one direction for at least one circle. After wrapping, the other end is passed through the circular through hole 1321 and connected to the driving shaft of the telescopic driving member 131. The winding directions of at least two groups of flexible constricting belts 141 are opposite to ensure that the circumferential resistance of the flexible spring sheet 1221 is roughly the same, and to ensure that the central axis position of the inner tube 122 remains unchanged.

[0044] See also Figure 2 The flexible constricting belt 141 controls the deformation of the inner tube 122 by tightening, so that a contraction section 1225, a throat 1226 and an expansion section 1227 are formed inside the inner tube 122 along the steam inlet direction. The contraction section 1225 is used to accelerate the high-parameter steam once, and the expansion section 1227 is used to accelerate the high-parameter steam twice. The diameter d of the throat 1226, the diameter r of the outer tube 121 and the inner ring diameter h of the assembly ring 1211 meet the following conditions: r≥4 / 3d, d≤0.9h. By limiting the range of the diameter of the throat 1226, the diameter of the outer tube 121 and the inner ring diameter of the assembly ring 1211 during the adjustment process, the deformation of the inner tube 122 is limited when the device adjusts the caliber, thereby controlling the adjustment amount of the caliber.

[0045] See also Figure 2 、 Figure 7 、 Figure 8 and Figure 9, and also includes a seal 16, two of which are provided and respectively assembled on the outer walls of both sides of the outer tube 121, and the two seals 16 are sealingly assembled at one end of the flexible constricting belt 141 and the driving shaft of the telescopic driving member 131. By adopting the seal 16, the seal 16 is assembled at the position where the flexible constricting belt 141 passes through the outer tube 121, thereby effectively improving the sealing performance of the entire nozzle assembly 12.

[0046] In this embodiment, the seal 16 can be a sealing ring made of silicon carbide, graphite or other materials. The specific shape can be adaptively adjusted according to actual working conditions. Since the assembly process of the existing sealing ring is common knowledge to those skilled in the art, it will not be described here.

[0047] A second object of the present invention is to provide a steam injection system.

[0048] In order to achieve the above-mentioned purpose, the technical solution of the present application is as follows: a steam injection system, including a steam injector with an adjustable nozzle diameter. By setting the steam injector with an adjustable nozzle diameter in the present application in the steam injection system, it is particularly suitable for processes such as improving heating steam parameters and recovering steam waste heat in industrial production. It has wide adaptability and can more effectively recover waste heat and improve steam parameters.

[0049] To sum up, when it is necessary to reduce the diameter of the device, the driving shaft of the telescopic driving member 131 is controlled to move upward, and the driving shaft drives one end of the flexible constricting belt 141 to move upward. Since the other end of the flexible constricting belt 141 is fixed, the ring of the flexible constricting belt 141 wrapped around the outside of the inner tube 122 shrinks, driving the middle part of the inner tube 122 to shrink. Since the two ends of the flexible spring piece 1221 are respectively connected and fixed to the assembly ring 1211, the flexible spring piece 1221 bends toward the central axis of the outer tube 121, and multiple flexible spring pieces 1221 are all close to the central axis of the outer tube 121, thereby forming a compression section, a throat 1226 and an expansion section 1227, so as to perform secondary acceleration on the high-parameter steam, facilitate its induced low-parameter steam, enable the two to mix in the diffuser tube, and finally eject the mixed steam at high speed.

[0050] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A steam ejector with adjustable nozzle diameter, characterized in that: include: A steam receiving chamber (11) is hollow inside, and the steam receiving chamber (11) is used to receive high-parameter steam and use the high-parameter steam to eject low-parameter steam. A nozzle assembly (12) is provided inside the steam receiving chamber (11), and the nozzle assembly (12) includes an outer tube (121) and a deformable inner tube (122). The outer tube (121) is coaxially sleeved outside the inner tube (122), and the two ends of the outer tube (121) are respectively connected and fixed to the two ends of the inner tube (122). A deformation gap (123) is provided between the inner tube (122) and the outer tube (121). An adjustment assembly (13) is provided at the upper end of the steam receiving chamber (11), and one end of the adjustment assembly (13) extends into the deformation gap (123), and controls the deformation of the inner tube (122) through a constricting member (14); A venturi tube (15), one end of which is in communication with the steam receiving chamber (11), is used for mixing high-parameter steam and low-parameter steam and discharging them.

2. The steam ejector with adjustable nozzle diameter according to claim 1, characterized in that: The steam receiving chamber (11) comprises: a first steam inlet pipe (111), the first steam inlet pipe (111) being used to receive high-parameter steam, one end of the first steam inlet pipe (111) being in communication with the nozzle assembly (12), and one end of the nozzle assembly (12) being in communication with the steam receiving chamber (11); A second steam inlet pipe (112), the second steam inlet pipe (112) is used to receive low-parameter steam, and the second steam inlet pipe (112) is communicated with the steam receiving chamber (11).

3. The steam ejector with adjustable nozzle diameter according to claim 2, characterized in that: The inner walls of both ends of the outer tube (121) are embedded with assembly rings (1211); The inner tube (122) comprises a plurality of flexible spring sheets (1221) arranged inside the outer tube (121), wherein the plurality of flexible spring sheets (1221) are mutually surrounded to form a columnar inner channel (1222), wherein the outer wall on one side of the flexible spring sheet (1221) is provided with a first arc-shaped chamfered surface (1223), and the inner wall on the other side is provided with a second arc-shaped chamfered surface (1224), and the first arc-shaped chamfered surface (1223) of the flexible spring sheet (1221) and the second arc-shaped chamfered surface (1224) of the adjacent flexible spring sheet (1221) are in contact with each other and stacked.

4. The steam ejector with adjustable nozzle diameter according to claim 3, characterized in that: The venturi tube (15) is an hourglass-shaped component. The venturi tube (15) comprises a contraction portion (151), a throat portion (152) and a diffusion portion (153). The contraction portion (151), the throat portion (152) and the diffusion portion (153) are arranged in sequence along the gas outlet direction and are interconnected. One end of the contraction portion (151) is connected to the steam receiving chamber (11).

5. The steam ejector with adjustable nozzle diameter according to claim 3, characterized in that: The plurality of flexible spring sheets (1221) are divided into at least two groups that surround each other, the at least two groups of flexible spring sheets (1221) are coaxially arranged to form the inner layer tube (122), and the contact positions of the first arc-shaped chamfered surface (1223) and the second arc-shaped chamfered surface (1224) in the at least two groups of flexible spring sheets (1221) are staggered with each other.

6. The steam ejector with adjustable nozzle diameter according to claim 1, characterized in that: The regulating component (13) further comprises: a telescopic driving member (131), the telescopic driving member (131) being assembled in the steam receiving chamber (11), the driving shaft of the telescopic driving member (131) passing through the steam receiving chamber (11) and extending into the deformation gap (123), the driving shaft of the telescopic driving member (131) being connected and fixed to the constricting member (14) to pull the constricting member (14) to move in a vertical direction; A limiting plate (132), wherein a circular through hole (1321) is provided in the middle of the limiting plate (132), and two limiting plates (132) are provided. The two limiting plates (132) are assembled on the inner wall of the outer tube (121) and are perpendicular to the radial direction of the outer tube (121). The two limiting plates (132) are respectively provided on both sides of the inner tube (122), and the two ends of the constricting member (14) respectively pass through the circular through hole (1321).

7. The steam ejector with adjustable nozzle diameter according to claim 6, characterized in that: The constricting member (14) comprises: At least two groups of flexible constricting belts (141), at least two groups of the flexible constricting belts (141) are spaced apart along the length direction of the inner tube (122) and are wound around the outside of the inner tube (122), at least two groups of the flexible constricting belts (141) have different winding directions, one end of the flexible constricting belt (141) passes through the circular through hole (1321) located below the inner tube (122) and is connected to the outer wall of the outer tube (121), and the other end of the flexible constricting belt (141) passes through the circular through hole (1321) located above the inner tube (122) and is fixedly connected to the drive shaft of the telescopic drive member (131).

8. The steam ejector with adjustable nozzle diameter according to claim 7, characterized in that: The flexible constricting belt (141) controls the deformation of the inner tube (122) by tightening, so that a contraction section (1225), a throat (1226) and an expansion section (1227) are formed inside the inner tube (122) along the steam inlet direction. The contraction section (1225) is used to accelerate the high-parameter steam once. The high-parameter steam is expanded and accelerated in the expansion section (1227) to generate a supersonic jet. The diameter d of the throat (1226), the diameter r of the outer tube (121) and the inner ring diameter h of the assembly ring (1211) meet the following requirements: r≥4 / 3d, d≤0.9h.

9. The steam ejector with adjustable nozzle diameter according to claim 8, characterized in that: It also includes a sealing member (16), two of which are respectively assembled on the outer walls of both sides of the outer tube (121), and the two sealing members (16) are sealingly assembled at one end of the flexible contracting belt (141) and the driving shaft of the telescopic driving member (131).

10. A steam injection system, characterized in that: The invention comprises a steam ejector with adjustable nozzle diameter as described in any one of claims 1 to 9.

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