Streamline steam ejector

Abstract

The invention relates to the technical field of steam ejectors, in particular to a streamline steam ejector. Comprising a shell, a suction chamber, a gradually-shrinking mixing chamber, a constant-area mixing chamber and a diffusion chamber which are sequentially communicated are arranged in the shell, a main nozzle is fixedly connected to the side, close to the suction chamber, of the shell, an inlet section, a gradually-shrinking section, a nozzle throat and a gradually-expanding section which are sequentially communicated are arranged in the main nozzle, and the main nozzle is fixedly connected with a fixing shell. A first elastic film is fixedly connected to the side, close to the diverging section, of the fixing shell, and the first elastic film is connected with the inner side face of the diverging section. The stretching state of the first elastic film is controlled according to the pressure of the primary fluid in the main nozzle, the ejection capacity and kinetic energy consumption of the primary fluid are dynamically adjusted, the ejection capacity of the high-pressure primary fluid is improved, the kinetic energy consumption of the primary fluid is reduced when the pressure of the primary fluid is reduced, and the probability of ejection failure is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of steam ejectors, and in particular to a streamlined steam ejector. Background Art

[0002] A steam ejector is a device that uses high-speed steam as a power source to transmit fluids. In particular, when the steam ejector is used in combination with a multi-effect distillation water production system, the water production ratio of the system can be effectively improved and the energy loss rate can be greatly reduced. The working principle of the steam ejector is as follows: the steam ejector ejects a primary fluid in a high-pressure state through the main nozzle, and the primary fluid enters the suction chamber of the steam ejector. Subsequently, a negative pressure is generated during the high-speed flow of the primary fluid. The suction chamber extracts the external secondary fluid through the negative pressure generated by the primary fluid. The primary fluid and the secondary fluid are fully mixed when passing through the mixing chamber, and are ejected outward from the diffusion chamber to complete the ejection of the secondary fluid. The performance of the steam ejector is extremely dependent on the speed at which the primary fluid is ejected from the main nozzle, and the speed at which the primary fluid is ejected from the main nozzle is closely related to the operating conditions of the primary fluid. However, during the operation of the steam ejector, the pressure of the primary fluid often fluctuates due to changes in the operating conditions. The pressure of the primary fluid often fluctuates during operation, causing the ejection capacity of the steam ejector to be in an unstable state, and even ejection failure may occur due to the low pressure of the primary fluid, causing the performance of the entire water production system to decrease. Summary of the invention

[0003] In order to overcome the disadvantage that when the pressure of a primary fluid often fluctuates during operation, the ejection capability of the steam ejector will be in an extremely unstable state, or even ejection failure may occur, the present invention provides a streamlined steam ejector.

[0004] The technical implementation scheme of the present invention is: a streamlined steam ejector, comprising a shell, in which a suction chamber, a convergent mixing chamber, a constant area mixing chamber and a diffusion chamber connected in sequence are arranged, a main nozzle is fixedly connected to a side of the shell close to the suction chamber, an inlet section, a convergent section, a nozzle throat and a gradually expanding section connected in sequence are arranged in the main nozzle, the main nozzle is fixedly connected to a fixed shell, a first elastic membrane is fixedly connected to a side of the fixed shell close to the gradually expanding section, the first elastic membrane is connected to the inner side surface of the gradually expanding section, and an extension mechanism is arranged on the main nozzle for controlling the extension state of the first elastic membrane according to the fluid pressure in the inlet section.

[0005] Furthermore, the profile of the cross section of the tapered section is composed of two first arcs and two second arcs, and the curvature of the first arc is smaller than the curvature of the second arc.

[0006] Furthermore, the extension mechanism includes a mounting block, which is detachably slidably connected to the main nozzle, the mounting block is fixedly connected to a pneumatic telescopic rod, the telescopic end of the pneumatic telescopic rod is fixedly connected to a movable frame, and a first elastic member is installed between the two, the movable frame is fixedly connected to a connecting rod, the connecting rod is fixedly connected to an extrusion ring, the extrusion ring is used to squeeze the first elastic membrane to deform, the movable frame is slidably connected to a sliding frame, and a second elastic member is fixedly connected between the two, the sliding frame is fixedly connected to the first elastic membrane, the fixed shell is provided with a limiting component for limiting the first elastic membrane, and a detection component for detecting the fluid pressure of the inlet section is provided in the mounting block.

[0007] Furthermore, the limiting assembly includes a fixing ring, which is fixed to the fixed shell, and the fixing ring is fixed with a first sliding support rod distributed at circumferential intervals, and the extrusion ring is fixed with a second sliding support rod distributed at circumferential intervals, the second sliding support rod is made of elastic metal material, and the first sliding support rod corresponds to the second sliding support rod one by one and is connected in a limiting sliding manner.

[0008] Furthermore, the detection assembly includes a second elastic membrane, the second elastic membrane is fixed to the mounting block, the second elastic membrane and the mounting block together form a detection cavity, and the detection cavity in the mounting block is connected to the pneumatic telescopic rod.

[0009] Furthermore, the mounting block is fixedly connected to a limiting ring, the limiting ring is located in the detection cavity of the mounting block, and the limiting ring is used to limit the deformation range of the second elastic membrane.

[0010] Furthermore, the inner diameter of the second elastic membrane is equal to the inner diameter of the inlet section tube wall.

[0011] Furthermore, it also includes symmetrically distributed gradually expanding tubes, which are all fixedly connected in the shell, and the gradually expanding tubes are located in the suction chamber and the gradually converging mixing chamber. The gradually expanding tubes are fixedly connected and connected with the guide tube, and the end of the gradually expanding tube away from the guide tube is an air outlet, and the air outlet of the gradually expanding tube is located in the gradually converging mixing chamber.

[0012] Furthermore, the gas outlet of the gradually expanding tube is located between the first elastic membrane and the constant-area mixing chamber.

[0013] Furthermore, the gas outlet of the gradually diverging tube is provided with an inclined surface, and the angle between the inclined surface and the axis of the constant area mixing chamber is greater than the angle between the gradually diverging section and the axis of the constant area mixing chamber.

[0014] The present invention has the following advantages: the present invention controls the stretching state of the first elastic membrane according to the pressure of the primary fluid in the main nozzle, the first elastic membrane and the main nozzle form a streamlined structure, and then smoothly adjusts the injection angle and injection range of the primary fluid ejected by the main nozzle, dynamically adjusts the ejection capacity of the primary fluid and its kinetic energy consumption, improves the ejection capacity of the high-pressure primary fluid, and reduces the kinetic energy consumption of the primary fluid when the pressure of the primary fluid decreases, thereby reducing the probability of ejection failure.

[0015] The present invention detects the pressure in the main nozzle through the second elastic membrane, and limits the second elastic membrane through a limiting ring, ensuring that the flow state of the primary fluid and the secondary fluid in the main nozzle is always in a smooth flow state, reducing the kinetic energy loss of the primary fluid during the detection process.

[0016] The present invention adds a gradually diverging tube and forms a gradually decreasing pressure gradient in the gradually diverging tube. The gradually diverging tube increases the effect of sucking the secondary fluid by negative pressure, increases the flow rate of the sucked secondary fluid, and reduces the kinetic energy loss when the secondary fluid mixes with the primary fluid, thereby further reducing the energy loss of the primary fluid and reducing the possibility of primary fluid ejection failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 is a cross-sectional view of the housing of the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the housing and the main nozzle of the present invention; Figure 4 is a cross-sectional view of the housing and the main nozzle of the present invention; Figure 5 It is a cross-sectional view of the main nozzle, the fixed shell and the first elastic membrane of the present invention; Figure 6 An exploded view of the main nozzle, the fixed shell and the first elastic membrane of the present invention; Figure 7 For the present invention Figure 5 The enlarged view of point A in the middle; Figure 8 It is a schematic diagram of the three-dimensional structure of the first sliding support rod and the second sliding support rod of the present invention; Fig. 9 It is a schematic diagram of the three-dimensional structure of the second elastic membrane and the limiting ring of the present invention; Fig.10 is a cross-sectional view of the second elastic membrane and the limiting ring of the present invention; Fig.11 It is a cross-sectional view of the shell and the gradually expanding tube of the present invention.

[0018] Among them, the above-mentioned drawings include the following figure marks: 1. shell, 101. suction chamber, 102. convergent mixing chamber, 103. constant area mixing chamber, 104. expansion chamber, 2. main nozzle, 201. inlet section, 202. convergent section, 2021. first arc line, 2022. second arc line, 203. nozzle throat, 204. gradually expanding section, 3. fixed shell, 4. first elastic membrane, 5. mounting block, 6. pneumatic telescopic rod, 7. movable frame, 8. connecting rod, 9. extrusion ring, 10. sliding frame, 11. fixed ring, 12. first sliding support rod, 13. second sliding support rod, 14. second elastic membrane, 15. limiting ring, 17. guide tube, 18. gradually expanding tube, 181. inclined surface. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It is only stated that the directional terms such as left, right, inside, outside, etc. that appear or will appear in the text of the present invention are only based on the accompanying drawings of the present invention, and are not specific limitations of the present invention.

[0020] A streamlined steam ejector, reference Figure 1-Figure 6 , comprising a shell 1, in which a suction chamber 101, a gradually converging mixing chamber 102, a constant area mixing chamber 103 and a diffusion chamber 104 are arranged in sequence, a main nozzle 2 is fixedly connected to the side of the shell 1 close to the suction chamber 101, an inlet section 201, a gradually converging section 202, a nozzle throat 203 and a gradually expanding section 204 are arranged in sequence, the main nozzle 2 is fixedly connected to a fixed shell 3, a first elastic membrane 4 is fixedly connected to the side of the fixed shell 3 close to the gradually expanding section 204, the first elastic membrane 4 is connected to the inner side surface of the gradually expanding section 204, and an extension mechanism for controlling the extension state of the first elastic membrane 4 according to the fluid pressure in the inlet section 201 is arranged on the main nozzle 2.

[0021] In the above scheme, the gradually expanding section 204 is located on the left side of the gradually converging mixing chamber 102, and the first elastic membrane 4 is connected with the gradually expanding section 204, so that the first elastic membrane 4 and the gradually expanding section 204 form a streamlined flow-guiding structure, which is used for the first elastic membrane 4 to replace the gradually expanding section 204 to complete the process of reducing the pressure and increasing the speed of the primary fluid in the gradually expanding section 204, and the first elastic membrane 4 can fine-tune the distance and angle of guiding the primary fluid according to the pressure of the primary fluid on the basis of the original function of the gradually expanding section 204, and then dynamically adjust the ejection capacity and kinetic energy consumption of the primary fluid according to the pressure of the primary fluid, and when the pressure of the primary fluid increases, the ejection capacity and kinetic energy consumption of the primary fluid are increased, thereby improving the ejection efficiency of the device, and in the first When the fluid pressure decreases, the ejection capacity of the primary fluid and its kinetic energy consumption are reduced, thereby avoiding the situation in which the primary fluid kinetic energy consumption is too large and the primary fluid ejection capacity fails; the first elastic membrane 4 is made of a high-durability and high-temperature resistant material (such as fluororubber or silicone rubber), the thickness of the first elastic membrane 4 is relatively large and the stretching capacity is limited, so the first elastic membrane 4 is always in a taut state during use, and the first elastic membrane 4 will not be violently deformed due to the primary fluid extrusion during operation; the shell 1 and the main nozzle 2 are detachably connected, and the main nozzle 2 and the shell 1 adopt a modular design, processing and assembly solution, so that the two can be designed, optimized and tested separately, reducing the cost and cycle of design optimization of the device.

[0022] Furthermore, reference Figure 5 and Figure 6 The profile of the cross section of the tapered section 202 is composed of two first arcs 2021 and two second arcs 2022 , and the curvature of the first arc 2021 is smaller than the curvature of the second arc 2022 .

[0023] In the above solution, the right end point of the first arc 2021 is connected to the left end point of the adjacent second arc 2022. Figure 5 The edge line of the cross section of the middle nozzle throat 203 is tangent to the circle corresponding to the adjacent second arc 2022. The curvature of the second arc 2022 is smaller than that of the first arc 2021. By setting the curvature relationship between the two, the efficiency of accelerating the fluid at the second arc 2022 is improved, and the flow rate of the fluid when it reaches the nozzle throat 203 is increased, thereby increasing the speed-up effect of the primary fluid in the main nozzle 2 in a high-pressure state, and improving the smoothness of the fluid flow at the first arc 2021, reducing the kinetic energy loss of the fluid at the edge of the inlet section 201 during the turning process, and then when guiding the primary fluid in a low-pressure state in the main nozzle 2, the kinetic energy loss of the low-pressure primary fluid during the flow process is reduced, and the ejection capacity of the primary fluid in a low-pressure state is increased.

[0024] Furthermore, reference Figure 4-Figure 7The extension mechanism includes a mounting block 5, which is detachably slidably connected to the main nozzle 2, the mounting block 5 is fixedly connected to a pneumatic telescopic rod 6, the telescopic end of the pneumatic telescopic rod 6 is fixedly connected to a moving frame 7, and a first elastic member is installed between the two, the moving frame 7 is fixedly connected to a connecting rod 8, the connecting rod 8 is fixedly connected to an extrusion ring 9, the extrusion ring 9 is used to extrude the first elastic membrane 4 to deform, the moving frame 7 is slidably connected to a sliding frame 10, and a second elastic member is fixedly connected between the two, the sliding frame 10 is fixedly connected to the first elastic membrane 4, the fixed shell 3 is provided with a limiting component for limiting the first elastic membrane 4, and a detection component for detecting the fluid pressure of the inlet section 201 is provided in the mounting block 5.

[0025] In the above scheme, the mounting block 5 is installed on the main nozzle 2 through a detachable structure, and a modular design concept is adopted to reduce the cost and cycle of design optimization of the device; the extrusion ring 9 changes the inclination angle of the first elastic membrane 4 by extrusion by moving horizontally to the right, thereby adjusting the diffusion angle of the primary fluid when it is sprayed outward; the first elastic member on the moving frame 7 is a spring, and the second elastic member on the sliding frame 10 is a spring. The elastic force of the first elastic member on the moving frame 7 is greater than the elastic force of the second elastic member on the sliding frame 10. When the first elastic membrane 4 is squeezed by the extrusion ring 9 and subjected to a rightward force, the outer side of the first elastic membrane 4 drags the sliding frame 10 to the right together Move, thereby reducing the degree of tensile deformation of the first elastic membrane 4 to extend the service life of the first elastic membrane 4; the initial state of the moving frame 7, the connecting rod 8 and the extrusion ring 9 is located at the rightmost side of its stroke, the initial state of the second elastic member on the sliding frame 10 is a compressed force storage state, and the moving frame 7 and the sliding frame 10 are not in contact with each other. The state shown in the figure is the state of the device working under the condition that the primary fluid is in a high-pressure state. Therefore, the moving frame 7, the connecting rod 8 and the extrusion ring 9 are located at the leftmost side of the stroke, the first elastic member on the moving frame 7 is in a compressed force storage state, the second elastic member on the sliding frame 10 is in a relaxed state, and the moving frame 7 and the sliding frame 10 are in contact with each other.

[0026] Furthermore, reference Figure 6-Figure 8 The limiting assembly includes a fixing ring 11, which is fixed to the fixing shell 3. The fixing ring 11 is fixed with first sliding support rods 12 distributed at circumferential intervals. The extrusion ring 9 is fixed with second sliding support rods 13 distributed at circumferential intervals. The second sliding support rods 13 are made of elastic metal. The first sliding support rods 12 and the second sliding support rods 13 correspond to each other one by one and are connected in a limiting sliding manner.

[0027] In the above scheme, the fixed ring 11 and the first sliding support rod 12 are both made of rigid materials, and the two are used to support the inside of the first elastic membrane 4 to reduce the degree of expansion of the first elastic membrane 4 due to the pressure of the primary fluid. The second sliding support rod 13 is made of elastic metal material. On the one hand, it can adapt to the change of the angle of the connection between the extrusion ring 9 and the fixed ring 11 when the extrusion ring 9 moves. On the other hand, the second sliding support rod 13 is deformed to support and limit the first elastic membrane 4 on the right side of the first sliding support rod 12 along an arc trajectory, thereby increasing the smoothness of the primary fluid guidance.

[0028] Furthermore, reference Figure 4 , Fig. 9 and Fig.10 The detection component includes a second elastic membrane 14, which is fixed to the mounting block 5. The second elastic membrane 14 and the mounting block 5 together form a detection cavity, and the detection cavity in the mounting block 5 is connected to the pneumatic telescopic rod 6.

[0029] Furthermore, reference Fig. 9 and Fig.10 The mounting block 5 is fixedly connected with a limiting ring 15 . The limiting ring 15 is located in the detection cavity of the mounting block 5 . The limiting ring 15 is used to limit the deformation range of the second elastic membrane 14 .

[0030] Furthermore, reference Figure 4 The inner diameter of the second elastic membrane 14 is equal to the inner diameter of the tube wall of the inlet section 201 .

[0031] In the above scheme, the second elastic membrane 14 is initially in a stretched state, the cavity of the detection chamber is larger than the cavity in the pneumatic telescopic rod 6, and the detection chamber is connected to the right side of the pneumatic telescopic rod 6. When the gas in the detection chamber is squeezed, the gas in the detection chamber is discharged into the pneumatic telescopic rod 6, and the telescopic end of the pneumatic telescopic rod 6 retracts to the left. Figure 4 and Fig. 9 The pneumatic telescopic rod 6 is in a contracted state (when the primary fluid pressure is high), the telescopic end of the pneumatic telescopic rod 6 retracts to the left to the limit state, and the telescopic end of the pneumatic telescopic rod 6 is initially in an extended state; the shape of the limit ring 15 is as shown Fig. 9 and Fig.10 As shown, the limiting ring 15 is used to limit the second elastic membrane 14. When the second elastic membrane 14 is squeezed and deformed by the primary fluid pressure, the second elastic membrane 14 is deformed to a state of being fitted with the limiting ring 15 at most, so that the second elastic membrane 14 is always in a state of being connected with the tube wall of the inlet section 201, thereby reducing the energy loss in the primary fluid flow process while detecting the primary fluid pressure, and maintaining the smoothness of the primary fluid flow process. Fig.10 The state of the second elastic membrane 14 is an initial state where no deformation occurs.

[0032] In the above scheme, the mounting block 5 and the main nozzle 2 are detachably connected (for example, connected by screws or bolts), the telescopic end of the pneumatic telescopic rod 6 and the movable frame 7 are detachably connected (for example, connected by screws or bolts), and the fixed shell 3 and the main nozzle 2 are also detachably connected (for example, connected by screws or bolts). By modularizing the corresponding parts, the difficulty of reprocessing the parts is reduced.

[0033] The working principle of the above scheme is: before using the device, the staff first assembles the fixed shell 3, the mounting block 5 and the main nozzle 2 together through the existing connection structure, so that the main nozzle 2 and the mounting block 5 become relatively fixed. Then the staff fixes the telescopic end of the pneumatic telescopic rod 6 to the movable frame 7 to complete the assembly process of the fixed shell 3, the mounting block 5 and the main nozzle 2.

[0034] After the staff assembles the fixed shell 3, the mounting block 5 and the main nozzle 2, the main nozzle 2 is assembled onto the shell 1, and then the main nozzle 2 is connected to the primary fluid source, and the suction chamber 101 is connected to the secondary fluid source, and firstly a part of the secondary fluid is actively injected into the shell 1, so that the suction chamber 101 and the tapered mixing chamber 102 of the shell 1 are filled with the secondary fluid to complete the initial injection process, and then the staff supplies high-pressure primary fluid into the main nozzle 2 through the primary fluid source. When the primary fluid pressure is high, the primary fluid squeezes the second elastic membrane 14 through the air pressure, and the second elastic membrane 14 is deformed by the force. During the deformation process of the second elastic membrane 14, the second elastic membrane 14 gradually fits with the limit ring 15 to maintain the second elastic membrane 14 is in a connected state with the entrance section 201, the second elastic membrane 14 is deformed to squeeze the gas in the detection chamber of the mounting block 5 into the pneumatic telescopic rod 6, the telescopic end of the pneumatic telescopic rod 6 retracts inwardly, and drives the movable frame 7, the connecting rod 8 and the extrusion ring 9 to move leftward, the first elastic member on the movable frame 7 is compressed and stored, the extrusion ring 9 stops squeezing the first elastic membrane 4, the second elastic member on the sliding frame 10 is released, and the sliding frame 10 moves to the left relative to the extrusion ring 9 under the action of the second elastic member thereon, and the second sliding support rod 13 is gradually inserted into the adjacent first sliding support rod 12 until the telescopic end of the pneumatic telescopic rod 6 retracts to the leftmost side of the stroke, at which time the first elastic membrane 4, the movable frame 7, the connecting rod 8, the extrusion ring 9 and the sliding frame 10 stop moving together, and the state of this device is the same as that of the pneumatic telescopic rod 6. Figure 4 The status in is consistent.

[0035] During the flow of the primary fluid in the main nozzle 2, it first passes through the inlet section 201, and then gradually enters the tapered section 202. The primary fluid is gradually accelerated by the guidance of the first arc 2021 and the second arc 2022. Then the primary fluid enters the nozzle throat 203, and is sprayed to the right at a high speed through the guidance of the gradually expanding section 204 and the first elastic membrane 4. The primary fluid enters the tapered mixing chamber 102. At this time, since the moving frame 7, the connecting rod 8, the extrusion ring 9 and the sliding frame 10 are all located at the leftmost end of the stroke, the inclination angle in the first elastic membrane 4 is relatively large. Therefore, after the primary fluid passes through the first elastic membrane 4 and is sprayed to the right, its spray range is wide and the spray speed is high. Therefore, the primary fluid pushes the secondary fluid in the tapered mixing chamber 102 over a large range. Flowing to the right, negative pressure is generated in the tapered mixing chamber 102, and the negative pressure drives the secondary fluid in the suction chamber 101 to flow to the right. Negative pressure is also generated in the suction chamber 101. The suction chamber 101 draws the secondary fluid in the secondary fluid source through the negative pressure. After the secondary fluid enters the suction chamber 101, it flows to the tapered mixing chamber 102 synchronously with the negative pressure attraction, and is finally mixed into the high-speed flowing primary fluid. The primary fluid and the secondary fluid are pressurized and accelerated through the tapered mixing chamber 102 and enter the constant-area mixing chamber 103. After the primary fluid and the secondary fluid enter the constant-area mixing chamber 103, no new fluid is mixed and added. The two fluids are gradually and evenly mixed during the high-speed flow process, and finally are decompressed and ejected from the expansion chamber 104 to complete the entire injection process.

[0036] When the pressure in the primary fluid source decreases due to fluctuations, the pressure of the primary fluid decreases. At this time, the first arc 2021 and the second arc 2022 jointly guide the primary fluid, and synchronously reduce the capacity loss of the primary fluid in the main nozzle 2. At the same time, the second elastic membrane 14 senses the reduction in the primary fluid pressure, and the primary fluid extrusion force on the second elastic membrane 14 becomes smaller. The telescopic end of the pneumatic telescopic rod 6 extends to the right under the action of the first elastic member thereon, and squeezes the gas in the pneumatic telescopic rod 6 into the detection cavity. The second elastic membrane 14 gradually deforms to the initial position. The telescopic end of the pneumatic telescopic rod 6 drives the moving frame 7, the connecting rod 8, the extrusion ring 9 and the sliding frame 10 to move to the right together. The extrusion ring 9 squeezes the first elastic membrane 4 to the right during the movement. However, because the inner side of the first elastic membrane 4 is fixedly connected to the fixed shell 3, the first elastic membrane 4 cannot move to the right together under the action of the extrusion force. The first elastic membrane 4 drags the sliding frame 10 to move to the right relative to the moving frame 7. The second elastic member on the sliding frame 10 is gradually compressed and accumulates force, and the second sliding support rod 13 gradually extends to the right relative to the first sliding support rod 12. At this time, the first sliding support rod 12 supports the left side of the first elastic membrane 4, and the second sliding support rod 13 supports the right side of the first elastic membrane 4. The first elastic membrane 4 gradually extends the right part of the gradually expanding section 204 toward the direction of the mixing chamber 103 of the constant area. When the primary fluid is guided by the first elastic membrane 4 and then ejected, the injection angle and injection range of the primary fluid are simultaneously reduced, reducing the probability of the primary fluid impacting the gradually converging mixing chamber 102 after being ejected. At the same time, the distance that the primary fluid passes through the gradually converging mixing chamber 102 is reduced. At this time, although the amount of secondary fluid sucked in by the negative pressure when the primary fluid passes through the gradually converging mixing chamber 102 is reduced, the energy lost by the primary fluid when sucking and mixing the secondary fluid is simultaneously reduced, reducing the loss of energy in the primary fluid, thereby reducing the probability of ejection failure.

[0037] When the pressures on both sides of the second elastic membrane 14 are balanced with each other, the telescopic end of the pneumatic telescopic rod 6, the movable frame 7, the connecting rod 8, the extrusion ring 9 and the sliding frame 10 stop moving synchronously. When the pressure of the primary fluid recovers to the initial value, the second elastic membrane 14 is squeezed by the gas pressure of the primary fluid, and the gas in the detection chamber is squeezed into the pneumatic telescopic rod 6 again. The telescopic end of the pneumatic telescopic rod 6 drives the movable frame 7, the connecting rod 8, the extrusion ring 9 and the sliding frame 10 to move to the left again according to the above-mentioned working principle, thereby increasing the efficiency of the primary fluid sucking in the mixed secondary fluid.

[0038] When the staff stops using the device, the staff stops supplying the primary fluid into the main nozzle 2, and disconnects the connection between the main nozzle 2 and the primary fluid and the connection between the shell 1 and the secondary fluid. The first elastic membrane 4, the telescopic end of the pneumatic telescopic rod 6, the movable frame 7, the connecting rod 8, the extrusion ring 9 and the sliding frame 10 are reset to the initial state under the action of the first spring on the pneumatic telescopic rod 6 and the second spring on the sliding frame 10.

[0039] Furthermore, reference Figure 3 , Figure 4 and Fig.11 , and also includes symmetrically distributed gradually expanding tubes 18, which are all fixedly connected to the shell 1, and are located in the suction chamber 101 and the gradually converging mixing chamber 102. The gradually expanding tubes 18 are fixedly connected to and connected with the guide tube 17, and the end of the gradually expanding tube 18 away from the guide tube 17 is an air outlet, and the air outlet of the gradually expanding tube 18 is located in the gradually converging mixing chamber 102.

[0040] Furthermore, reference Figure 3 , Figure 4 and Fig.11 The gas outlet of the gradually expanding tube 18 is located between the first elastic membrane 4 and the constant area mixing chamber 103 .

[0041] Furthermore, reference Figure 3 , Figure 4 and Fig.11 The outlet of the gradually expanding tube 18 is provided with an inclined surface 181 , and the angle between the inclined surface 181 and the axis of the constant area mixing chamber 103 is greater than the angle between the gradually expanding section 204 and the axis of the constant area mixing chamber 103 .

[0042] In the above scheme, the side of the guide tube 17 away from the gradually expanding tube 18 is located at the place where the secondary fluid enters the suction chamber 101, thereby increasing the efficiency of the guide tube 17 in collecting the secondary gas. The cross-sectional area in the gradually expanding tube 18 gradually expands from left to right. This is because the power of the secondary fluid in the gradually expanding tube 18 is the negative pressure created by the primary fluid, and a principle similar to that of a vacuum cleaner is formed, which reduces the dispersion of the flow rate caused by free diffusion of the negative pressure in a large space. The flow path of the secondary fluid is constrained by the gradually expanding tube 18, and the energy loss rate during the flow of the secondary fluid is reduced, thereby increasing the total amount of gas extracted in the gradually expanding tube 18, so that the gradually expanding tube 18 and the guide tube 17 can extract more secondary fluid in the suction chamber 101. And because the pressure gradient in the gradually expanding tube 18 gradually decreases from left to right, the speed of the secondary fluid in the gradually expanding tube 18 gradually decreases, reducing the impact effect of the secondary fluid on the primary fluid when it merges into the primary fluid; the cross-sectional shape of the gradually expanding tube 18 gradually changes from a shape close to a circular tube to a shape close to a semicircular ring, which is used to gradually and evenly diffuse the secondary fluid into different areas in the gradually converging mixing chamber 102, so that the secondary fluid in the gradually expanding tube 18 merges into the primary fluid along different paths, further reducing the impact force of the secondary fluid on the primary fluid; the angle between the inclined surface 181 and the axis of the mixing chamber 103 with a constant area is greater than the angle between the gradually expanding section 204 and the axis of the mixing chamber 103 with a constant area, that is, the inclined surface 18 1 is greater than the inclination angle of the gradually expanding section 204, so the primary fluid ejected from the gradually expanding section 204 will not directly enter the gradually expanding tube 18 through impact, reducing the probability of the primary fluid flowing back into the suction chamber 101 through the gradually expanding tube 18; the gas outlet of the gradually expanding tube 18 is located on the right side of the first elastic membrane 4 and the constant area mixing chamber 103. There are two ways for the primary fluid to absorb the secondary fluid, directly absorbing the secondary fluid in the suction chamber 101 and absorbing the secondary fluid in the suction chamber 101 through the gradually expanding tube 18. When the primary fluid in the main nozzle 2 is in a high pressure state, the primary fluid mainly absorbs the secondary fluid by directly absorbing the secondary fluid in the suction chamber 101, and when the main nozzle 2 is When the primary fluid in the suction chamber 101 is in a low pressure state, the rightmost end of the first elastic membrane 4 moves rightward, so that the range of the primary fluid directly absorbing the secondary fluid in the suction chamber 101 becomes smaller, while the efficiency of the primary fluid absorbing the secondary fluid in the suction chamber 101 through the gradually expanding tube 18 is not affected. At this time, because the negative pressure is concentrated near the gas outlet of the gradually expanding tube 18, the gradually expanding tube 18 is affected by its outlet shape, so that the flow rate of the gradually expanding tube 18 when sucking the secondary fluid is high, thereby ensuring the efficiency of the secondary fluid supply. At the same time, when the secondary fluid at the outlet of the gradually expanding tube 18 mixes with the primary fluid, the impact force on the primary fluid is reduced, thereby reducing the energy loss of the primary fluid and reducing the possibility of primary fluid ejection failure.

[0043] Those skilled in the art should understand that the above embodiments do not limit the present invention in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation shall fall within the protection scope of the present invention.

Claims

1. A streamlined steam ejector, characterized in that: The invention comprises a shell (1), wherein a suction chamber (101), a gradually converging mixing chamber (102), a constant area mixing chamber (103) and a diffusion chamber (104) are arranged in sequence in the shell (1), a main nozzle (2) is fixedly connected to a side of the shell (1) close to the suction chamber (101), wherein an inlet section (201), a gradually converging section (202), a nozzle throat (203) and a gradually expanding section (204) are arranged in sequence in the main nozzle (2), wherein the main nozzle (2) is fixedly connected to a fixed shell (3), wherein a first elastic membrane (4) is fixedly connected to a side of the fixed shell (3) close to the gradually expanding section (204), wherein the first elastic membrane (4) and the inner side surface of the gradually expanding section (204) are connected to each other, and wherein an extension mechanism for controlling the extension state of the first elastic membrane (4) according to the fluid pressure in the inlet section (201) is arranged on the main nozzle (2).

2. A streamlined steam ejector according to claim 1, characterized in that: The profile of the cross section of the tapered section (202) is composed of two first arcs (2021) and two second arcs (2022), and the curvature of the first arc (2021) is smaller than the curvature of the second arc (2022).

3. A streamlined steam ejector according to claim 1, characterized in that: The extension mechanism comprises a mounting block (5), the mounting block (5) being detachably slidably connected to the main nozzle (2), the mounting block (5) being fixedly connected to a pneumatic telescopic rod (6), the telescopic end of the pneumatic telescopic rod (6) being fixedly connected to a moving frame (7), and a first elastic member being installed between the two, the moving frame (7) being fixedly connected to a connecting rod (8), the connecting rod (8) being fixedly connected to an extrusion ring (9), the extrusion ring (9) being used to squeeze the first elastic membrane (4) to deform, the moving frame (7) being slidably connected to a sliding frame (10), and a second elastic member being fixedly connected between the two, the sliding frame (10) being fixedly connected to the first elastic membrane (4), the fixed shell (3) being provided with a limiting component for limiting the first elastic membrane (4), and a detection component for detecting the fluid pressure of the inlet section (201) being provided inside the mounting block (5).

4. A streamlined steam ejector according to claim 3, characterized in that: The limiting assembly comprises a fixing ring (11), the fixing ring (11) being fixedly connected to the fixing shell (3), the fixing ring (11) being fixedly connected to first sliding support rods (12) distributed at circumferential intervals, the extrusion ring (9) being fixedly connected to second sliding support rods (13) distributed at circumferential intervals, the second sliding support rods (13) being made of elastic metal, the first sliding support rods (12) and the second sliding support rods (13) being in one-to-one correspondence and being connected in a limiting sliding manner.

5. A streamlined steam ejector according to claim 4, characterized in that: The detection assembly comprises a second elastic membrane (14), the second elastic membrane (14) being fixedly connected to the mounting block (5), the second elastic membrane (14) and the mounting block (5) together forming a detection cavity, and the detection cavity in the mounting block (5) being in communication with the pneumatic telescopic rod (6).

6. A streamlined steam ejector according to claim 5, characterized in that: The mounting block (5) is fixedly connected to a limit ring (15), the limit ring (15) is located in the detection cavity of the mounting block (5), and the limit ring (15) is used to limit the deformation range of the second elastic membrane (14).

7. A streamlined steam ejector according to claim 6, characterized in that: The inner diameter of the second elastic membrane (14) is equal to the inner diameter of the tube wall of the inlet section (201).

8. A streamlined steam ejector according to claim 7, characterized in that: The invention also comprises symmetrically distributed gradually diverging tubes (18), which are all fixedly connected to the shell (1), and are located in the suction chamber (101) and the gradually converging mixing chamber (102). The gradually diverging tubes (18) are fixedly connected to and communicated with a flow guide tube (17), and one end of the gradually diverging tube (18) away from the flow guide tube (17) is an air outlet, and the air outlet of the gradually diverging tube (18) is located in the gradually converging mixing chamber (102).

9. A streamlined steam ejector according to claim 8, characterized in that: The gas outlet of the gradually expanding tube (18) is located between the first elastic membrane (4) and the constant-area mixing chamber (103).

10. A streamlined steam ejector according to claim 9, characterized in that: The gas outlet of the gradually expanding tube (18) is provided with an inclined surface (181), and the angle between the inclined surface (181) and the axis of the constant area mixing chamber (103) is greater than the angle between the gradually expanding section (204) and the axis of the constant area mixing chamber (103).

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