Cascade backflow ejector
Through the design of a cascade reflow inlet induced discharger, high-pressure fluid exchanges momentum in the nozzle and mixing chamber, solving the problems of excessive area ratio of conventional inlet induced dischargers and kinetic energy loss, achieving a large inlet ratio and high efficiency inlet effect.
Patent Information
- Application Number
- CN202422794066.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-15
- Publication Date
- 2025-08-22
- Estimated Expiration
- 2034-11-15
AI Technical Summary
Under the condition of a small pressure-raising ratio, the area ratio of a conventional single-stage induction device is too large, resulting in deterioration of the induction effect and excessive kinetic energy loss.
The cascade reflux injector is adopted, designed as a nozzle, a first mixing chamber, a second mixing chamber, a diffusing chamber and a mixing outlet pipe structure. The high-pressure fluid is accelerated and reduced through the nozzle and then flows back into the first mixing chamber, and exchanges momentum with the low-pressure fluid in the mixing chamber, forming a unified speed and then entering the diffusing tube to convert it into pressure energy. The mixed fluid is divided into two parts and output, realizing the integration of the two stages.
The induced ejaculation effect with a large induced ejaculation ratio is achieved, reducing kinetic energy loss and improving efficiency.
Smart Images
Figure CN223257156U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of ejectors, and in particular to a cascade reflux ejector. Background Art
[0002] In industrial production, an ejector with a large ejection ratio is often required. The so-called ejection ratio is the ratio of the flow rate of the ejected low-pressure medium to the flow rate of the high-pressure medium. The large ejection ratio is produced under the condition of a small pressure rise ratio. The so-called pressure rise ratio refers to the ratio of the difference between the outlet pressure and the low pressure △Pg to the difference between the high pressure and the low pressure △P0, that is, △Pg / △P0.
[0003] Under conditions where the pressure rise ratio is very small or the ejection ratio is very large, the ejection area ratio will be very large. The so-called area ratio refers to the ratio of the cross-sectional area of the mixing chamber to the cross-sectional area of the nozzle outlet. If the area ratio is too large, the flow beam at the nozzle outlet will be too thin and unable to effectively act on the low-pressure fluid, resulting in a deterioration of the ejection effect.
[0004] To achieve the ideal ejection effect, the area ratio must be reduced.
[0005] Conventional single-stage ejector mainly consists of three parts (such as Figure 1 、 2 )
[0006] 1. Nozzle: used to convert high-pressure fluid pressure energy into velocity energy;
[0007] 2. Mixing chamber: used for exchanging and unifying high and low pressure fluids at the same speed;
[0008] 3. Diffuser: used in the outlet section to convert velocity energy into pressure energy;
[0009] If we imagine using two ejectors to accomplish this, that is, the high-pressure medium first ejects part of the outlet medium, and then ejects the low-pressure medium after incremental pressure reduction, we can achieve the purpose of increasing the pressure rise ratio and reducing the area ratio (e.g. Figure 3 ), but the outlet medium of the first stage has experienced a process of deceleration and pressure increase, and the next stage has to enter the nozzle, and the pressure decreases and accelerates. This "rise and fall" will increase the flow loss in vain. Utility Model Content
[0010] In order to solve the above-mentioned problems, reduce the area ratio, reduce kinetic energy loss and improve efficiency, the present application provides a cascade reflux ejector.
[0011] The present application provides a cascade reflux ejector adopting the following technical solution.
[0012] A cascade reflux ejector comprises: a nozzle, a first mixing chamber, a second mixing chamber, a diffusion chamber, and a mixing outlet pipe in sequence along the fluid flow direction;
[0013] The nozzle is located in the head end of the first mixing chamber, the end of the first mixing chamber is located in the head end of the second mixing chamber, the diffusion chamber is connected to the end of the second mixing chamber, the head end of the mixing outlet pipe is located in the end of the diffusion chamber, and flows out from the end of the diffusion chamber. The mixed fluid that does not enter the mixing outlet pipe flows back into the first mixing chamber from the gap between the nozzle and the head end of the first mixing chamber, and the low-pressure fluid enters the second mixing chamber from the gap between the end of the first mixing chamber and the head end of the second mixing chamber.
[0014] By adopting the above technical solution, the high-pressure fluid enters the nozzle and is accelerated to reduce its pressure. The mixed fluid that flows back into the first mixing tube from the gap between the nozzle and the first end of the first expansion tube merges and exchanges momentum in the first mixing tube. After the exchange is completed, the fluid with a uniform speed directly enters the second mixing tube, merges with the incoming low-pressure fluid and exchanges momentum. After the exchange is completed, the fluid enters the diffuser tube after forming a uniform flow rate, converting velocity energy into pressure energy. After the pressure is increased in the diffuser tube, the mixed fluid is divided into two parts: one part enters the first mixing chamber through backflow and merges with the high-pressure fluid, and the other part enters the mixing outlet tube for output. This realizes the integration of the two stages, reduces kinetic energy loss, and improves efficiency.
[0015] Optionally, the nozzle is arranged at the end of the high-pressure inlet pipe, and the nozzle includes a conical part and a cylindrical part with a closing arrangement from the head end to the tail end.
[0016] By adopting the above technical solution and the structural design of the nozzle, the high-pressure fluid can be accelerated to reduce its pressure, and the high-pressure fluid can be sprayed into the first mixing chamber.
[0017] Optionally, the first mixing chamber includes a first mixing tube, a first expanding tube is provided at the head end of the first mixing tube, and the nozzle is located in the first expanding tube.
[0018] By adopting the above technical solution, the first expansion pipe is provided to have a flow-guiding effect, and the nozzle is located in the first expansion pipe, which is conducive to the high-pressure fluid ejected from the nozzle entering the first mixing chamber.
[0019] Optionally, the second mixing chamber includes a second mixing tube, a first end of the second mixing tube is provided with a second expanding tube, and a terminal end of the first mixing tube is located in the second expanding tube.
[0020] By adopting the above technical solution, the second expansion pipe is provided to have a flow-guiding effect. The end of the first mixing pipe is located in the second expansion pipe, which is conducive to the fluid ejected from the first mixing chamber entering the second mixing chamber.
[0021] Optionally, a low-pressure fluid cavity is provided on the periphery between the first mixing tube and the second expanding tube, and a low-pressure inlet pipe is provided in communication with the low-pressure fluid cavity.
[0022] Optionally, the low-pressure fluid cavity includes a low-pressure fluid sleeve, which is sleeved on the first mixing tube, the head end of the low-pressure fluid sleeve is sealed to the outer wall of the first mixing tube, and the tail end of the low-pressure fluid sleeve is sealed to the second expansion tube.
[0023] By adopting the above technical solution and setting the low-pressure fluid sleeve, the low-pressure fluid in the low-pressure inlet pipe can be buffered and stabilized, and enter the second mixing pipe along the gap between the first mixing pipe and the second expansion pipe.
[0024] Optionally, the mixed fluid that flows out from the end of the diffusion chamber and does not enter the mixing outlet pipe flows back into the first mixing chamber through the reflux cavity from the gap between the nozzle and the head end of the first expansion pipe.
[0025] Optionally, the nozzle, the first mixing chamber, the second mixing chamber, and the diffusion chamber are all located in the reflux cavity, and the high-pressure inlet pipe, the low-pressure inlet pipe, and the mixing outlet pipe all pass through the reflux cavity.
[0026] By adopting the above technical solution and setting the reflux cavity, the mixed fluid that has not entered the mixing outlet pipe can enter the reflux cavity and enter the first mixing pipe from the gap between the nozzle and the first end of the first expansion pipe to merge with the high-pressure fluid.
[0027] Optionally, the pressure diffuser chamber includes a pressure diffuser tube, and the pressure diffuser tube is expanded from the head end to the tail end.
[0028] By adopting the above technical solution and through the structural design of the diffuser tube, the velocity energy of the mixed fluid is converted into pressure energy.
[0029] Optionally, the diameter of the first mixing tube is smaller than the diameter of the second mixing tube.
[0030] In summary, this application has at least the following beneficial effects:
[0031] The high-pressure fluid of the present application enters the nozzle to accelerate and reduce the pressure, and the mixed fluid that flows back from the gap between the nozzle and the first end of the first expansion pipe into the first mixing pipe merges and exchanges momentum in the first mixing pipe. After the exchange is completed, the fluid with uniform speed directly enters the second mixing pipe, merges with the incoming low-pressure fluid and exchanges momentum. After the exchange is completed, it forms a uniform flow rate and enters the diffuser pipe to convert the velocity energy into pressure energy. The mixed fluid after the pressure is increased by the diffuser pipe is divided into two parts: one part enters the first mixing chamber through the backflow and merges with the high-pressure fluid, and the other part enters the mixing outlet pipe for output. The two stages are integrated into one, which can increase the pressure rise ratio, reduce the area ratio, and achieve a large injection ratio injection effect, while reducing kinetic energy loss and improving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0033] Figure 1 It is a schematic diagram of a conventional single-stage structure.
[0034] Figure 2 It is a schematic diagram of a conventional single-stage cross-sectional structure.
[0035] Figure 3 This is a schematic diagram of the structure of two ejectors.
[0036] Figure 4 It is a schematic diagram of the structure of a cascade reflux ejector.
[0037] Figure 5 The present invention is a schematic diagram of the cross-sectional structure of a cascade reflux ejector.
[0038] Figure 6 It is a schematic diagram of the top view of the cascade reflux ejector structure.
[0039] Figure 7 yes Figure 6 Schematic diagram of the cross-sectional structure along the section line AA.
[0040] Explanation of the accompanying drawings: 1. High-pressure inlet pipe; 2. Conical portion; 3. Cylindrical portion; 4. First mixing tube; 5. First expanding tube; 6. Second mixing tube; 7. Second expanding tube; 8. Low-pressure fluid cavity; 9. Low-pressure inlet pipe; 10. Diffuser; 11. Mixing outlet pipe; 12. Reflux cavity. DETAILED DESCRIPTION
[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0042] The following is combined with Figures 4 to 7 This application is described in further detail.
[0043] The embodiment of the present application discloses a cascade reflux ejector.
[0044] Reference Figures 4 to 7A cascade reflux ejector comprises: a high-pressure inlet pipe 1, a nozzle, a first mixing chamber, a second mixing chamber, a diffusion chamber, and a mixing outlet pipe 11 in sequence along the fluid flow direction;
[0045] The nozzle is arranged at the end of the high-pressure inlet pipe 1 and is connected to the high-pressure inlet pipe 1 in an integral structure. The nozzle includes a conical portion 2 and a cylindrical portion 3 with a closing arrangement from the head end to the tail end. The nozzle is located in the head end of the first mixing chamber, and the tail end of the first mixing chamber is located in the head end of the second mixing chamber. The diffusion chamber is connected to the tail end of the second mixing chamber in an integral structure, and the head end of the mixing outlet pipe 11 is located in the tail end of the diffusion chamber.
[0046] The structural design of the nozzle can realize the accelerated pressure reduction of the high-pressure fluid and spray the high-pressure fluid into the first mixing chamber.
[0047] The first mixing chamber includes a first mixing tube 4 and a first expanding tube 5. The end of the first expanding tube 5 is connected to the head end of the first mixing tube 4 in an integrated structure. The nozzle is located in the first expanding tube 5. The setting of the first expanding tube 5 has a diversion effect. The nozzle is located in the first expanding tube 5, which is conducive to the high-pressure fluid ejected by the nozzle entering the first mixing chamber.
[0048] The second mixing chamber includes a second mixing tube 6 and a second expanding tube 7. The end of the second expanding tube 7 is connected to the head end of the second mixing tube 6 in an integrated structure. The diameter of the first mixing tube 4 is smaller than the diameter of the second mixing tube 6. The end of the first mixing tube 4 is located in the second expanding tube 7. The setting of the second expanding tube 7 has a diverting effect. The end of the first mixing tube 4 is located in the second expanding tube 7, which is conducive to the fluid ejected from the first mixing chamber entering the second mixing chamber.
[0049] The low-pressure fluid enters the second mixing chamber from the gap between the end of the first mixing chamber and the beginning of the second mixing chamber. A low-pressure fluid cavity 8 is provided on the periphery between the first mixing tube 4 and the second expansion tube 7, and a low-pressure inlet pipe 9 is provided on the low-pressure fluid cavity 8. The low-pressure fluid cavity 8 includes a low-pressure fluid sleeve, which is sleeved on the first mixing tube 4. The beginning of the low-pressure fluid sleeve is sealed with the outer wall of the first mixing tube 4, and the end of the low-pressure fluid sleeve is sealed with the second expansion tube 7. The setting of the low-pressure fluid sleeve can buffer and stabilize the low-pressure fluid in the low-pressure inlet pipe 9 and enter the second mixing tube 6 along the gap between the first mixing tube 4 and the second expansion tube 7.
[0050] The diffuser chamber includes a diffuser tube 10 , which is expanded from the head end to the tail end. The structural design of the diffuser tube 10 converts the velocity energy of the mixed fluid into pressure energy.
[0051] The mixed fluid that flows out from the end of the diffusion chamber and does not enter the mixing outlet pipe 11 flows back into the first mixing chamber through the reflux cavity 12 from the gap between the nozzle and the head end of the first expansion pipe 5. The nozzle, first mixing chamber, second mixing chamber, and diffusion chamber are all located within the reflux cavity 12, and the high-pressure inlet pipe 1, low-pressure inlet pipe 9, and mixing outlet pipe 11 all pass through the reflux cavity 12. Due to the provision of the reflux cavity 12, the mixed fluid that does not enter the mixing outlet pipe 11 can enter the reflux cavity 12 and enter the first mixing pipe 4 from the gap between the nozzle and the head end of the first expansion pipe 5 to merge with the high-pressure fluid.
[0052] The high-pressure fluid enters the nozzle and is accelerated to reduce its pressure. The mixed fluid flows back from the gap between the nozzle and the first end of the first expansion tube 5 and enters the first mixing tube 4. The mixed fluid merges in the first mixing tube 4 and exchanges momentum. After the exchange is completed, the fluid with uniform speed directly enters the second mixing tube 6, merges with the incoming low-pressure fluid and exchanges momentum. After the exchange is completed, the fluid forms a uniform flow rate and enters the diffuser 10 to convert velocity energy into pressure energy. The mixed fluid after being pressurized by the diffuser 10 is divided into two parts: one part enters the first mixing chamber through backflow and merges with the high-pressure fluid, and the other part enters the mixing outlet pipe 11 for output. This realizes the integration of two stages, achieves a large injection ratio injection effect, reduces kinetic energy loss, and improves efficiency.
[0053] In the description of the present invention, it should be understood that the terms "head end", "end end", "inside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified and limited, it should be noted that the term "connection" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be a direct connection, or it can be an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.
[0054] The above are only preferred embodiments of the utility model and are not intended to limit the utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the utility model should be included in the scope of protection of the utility model.
Claims
1. A cascade reflux ejector, characterized in that: include: The device comprises a nozzle, a first mixing chamber, a second mixing chamber, a diffusion chamber, and a mixing outlet pipe in sequence along the fluid flow direction; The nozzle is located in the head end of the first mixing chamber, the end of the first mixing chamber is located in the head end of the second mixing chamber, the diffusion chamber is connected to the end of the second mixing chamber, the head end of the mixing outlet pipe is located in the end of the diffusion chamber, and flows out from the end of the diffusion chamber. The mixed fluid that does not enter the mixing outlet pipe flows back into the first mixing chamber from the gap between the nozzle and the head end of the first mixing chamber, and the low-pressure fluid enters the second mixing chamber from the gap between the end of the first mixing chamber and the head end of the second mixing chamber.
2. The cascade reflux ejector according to claim 1, characterized in that: The nozzle is arranged at the end of the high-pressure inlet pipe, and the nozzle comprises a conical portion and a cylindrical portion with a closed end in sequence from the head end to the tail end.
3. The cascade reflux ejector according to claim 2, characterized in that: The first mixing chamber includes a first mixing tube, a first expanding tube is provided at the head end of the first mixing tube, and the nozzle is located in the first expanding tube.
4. The cascade reflux ejector according to claim 3, characterized in that: The second mixing chamber includes a second mixing tube, a first end of the second mixing tube is provided with a second expanding tube, and a tail end of the first mixing tube is located in the second expanding tube.
5. The cascade reflux ejector according to claim 4, characterized in that: A low-pressure fluid cavity is provided on the periphery between the first mixing tube and the second expanding tube, and a low-pressure inlet pipe is provided in communication with the low-pressure fluid cavity.
6. The cascade reflux ejector according to claim 5, characterized in that: The low-pressure fluid cavity includes a low-pressure fluid sleeve, which is sleeved on the first mixing tube. The head end of the low-pressure fluid sleeve is sealed with the outer wall of the first mixing tube, and the tail end of the low-pressure fluid sleeve is sealed with the second flared tube.
7. The cascade reflux ejector according to claim 6, characterized in that: The mixed fluid that flows out from the end of the diffusion chamber and does not enter the mixing outlet pipe flows back into the first mixing chamber through the reflux cavity from the gap between the nozzle and the first expansion pipe.
8. The cascade reflux ejector according to claim 7, characterized in that: The nozzle, the first mixing chamber, the second mixing chamber, and the pressure diffusion chamber are all located in the reflux cavity, and the high-pressure inlet pipe, the low-pressure inlet pipe, and the mixing outlet pipe all pass through the reflux cavity.
9. The cascade reflux ejector according to claim 4, characterized in that: The pressure diffuser chamber includes a pressure diffuser tube, and the pressure diffuser tube is expanded from the head end to the tail end.
10. The cascade reflux ejector according to claim 4, characterized in that: The diameter of the first mixing tube is smaller than the diameter of the second mixing tube.