A steam ejector

Abstract

The present application relates to a steam ejector and to the technical field of steam ejectors. A steam ejector comprises a nozzle and a nozzle, one end of the nozzle is detachably connected to the nozzle by a bolt, the steam ejector further comprises a silencer and a noise reduction device, both of which are multi-layer structures, the silencer is fixedly connected to the nozzle, and the noise reduction device is detachably connected to the silencer and the nozzle, respectively. The present application is provided with a silencer and a noise reduction device, wherein the silencer can reduce the low-frequency noise generated by large-sized vortices, and the noise reduction device can reduce the high-frequency noise generated by small-sized vortices, and the present application has the function of silencing and reducing noise.

Description

Technical Field

[0001] The present application relates to the technical field of steam injection, and in particular to a steam injector. Background Art

[0002] As the demand for centralized heating in cities grows year by year, in the context of new power system construction, under current technical conditions and power generation installed capacity structure, cogeneration is an economically feasible, safe and reliable energy utilization method to meet the demand for centralized heating, and the utilization of waste heat from steam ejectors is one of the most widely used technical forms of cogeneration.

[0003] The steam ejector is a vacuum pump device that works at a certain pressure. The steam ejector includes a nozzle and a nozzle. The nozzle includes a nozzle. The nozzle includes a mixing chamber, a compression chamber and a diffusion chamber. The two ends of the compression chamber are fixedly connected to the mixing chamber and the diffusion chamber respectively. The motive steam is decompressed and accelerated through the nozzle. The potential energy of the steam is converted into kinetic energy and is sprayed into the mixing chamber at a supersonic speed. The motive steam is mixed with the pumped medium to exchange energy. The mixed steam enters the diffuser, decelerates and increases the pressure, and the kinetic energy is converted into pressure energy. In order to reduce the suction load of the subsequent pump, a condenser is configured. Through convection between two media with a certain temperature difference, heat exchange is carried out to achieve the purpose of condensing the high-temperature medium.

[0004] However, after the motive steam flows through the nozzle, its speed at the nozzle outlet reaches supersonic speed (800-1000 m / s). The excessively fast speed causes the small-sized vortices generated by the ejector body to form high-frequency noise, and the mixed steam generates large-sized vortices during movement to form low-frequency noise. Traditional noise reduction devices can only reduce the noise of the entire device, mainly reducing the high-frequency noise or the low-frequency noise within the device, but not both types of noise at the same time. Summary of the Invention

[0005] The purpose of this application is to provide a steam ejector capable of reducing high-frequency noise and low-frequency noise.

[0006] The steam ejector provided in this application adopts the following technical solution:

[0007] A steam ejector comprises a nozzle and a nozzle, one end of the nozzle being detachably connected to the nozzle by a bolt. The steam ejector further comprises a silencer and a noise reduction device, the silencer and the noise reduction device being a multi-layer structure formed by a plurality of sleeves abutting in sequence, the silencer being used to reduce low-frequency noise, and the noise reduction device being used to reduce high-frequency noise, the silencer being fixedly connected to the nozzle, and the noise reduction device being detachably connected to the silencer and the nozzle, respectively.

[0008] The motive steam initially has a high pressure. When the motive steam enters from the nozzle, the pressure energy is converted into velocity energy and enters the nozzle at an extremely high speed, which can reach 800-1000 m / s. After the motive steam exits the nozzle, the pressure drops sharply, and the air is sucked into the nozzle. The excessively fast speed causes the small-sized vortex generated by the ejector body to form high-frequency noise, and the mixed steam generates large-sized vortexes during the movement to form low-frequency noise. By adopting the above technical solution, a multi-layer structure of silencer and noise reduction device is set, wherein the silencer can reduce the low-frequency noise caused by the large-sized vortex at the steam ejector outlet, and the noise reduction device can reduce the high-frequency noise caused by the small-sized vortex of the ejector body. The combination of the silencer and the noise reduction device effectively reduces the noise generated when the steam ejector is working, and improves the quality of the industrial production environment.

[0009] Optionally, the nozzle includes a nozzle, an air jet pipe, a nozzle needle and a nozzle needle actuator, a power steam inlet is opened on the upper side of one end of the air jet pipe, the other side of the air jet pipe is fixedly connected to the nozzle, the top of the nozzle needle is conical, the nozzle needle passes through the air jet pipe and the top of the nozzle is located at the connection between the air jet pipe and the nozzle, the nozzle needle actuator is connected to the nozzle needle, and the nozzle needle actuator can control the nozzle needle to move along the length direction of the air jet pipe.

[0010] By adopting the above technical solution, the motive steam enters the nozzle from the motive steam inlet and is ejected from the nozzle along the jet pipe. The top of the nozzle needle is located at the connection between the jet pipe and the nozzle. Under the control of the nozzle needle actuator, it can move along the length of the jet pipe to adjust the flow area of the steam and thus control the amount of steam ejected from the nozzle. The operation is simple and easy to use.

[0011] Optionally, the nozzle includes a mixing chamber, a compression chamber and a diffusion chamber, the two ends of the compression chamber are respectively connected to the mixing chamber and the diffusion chamber, the lower end of the mixing chamber is provided with an exhaust steam inlet, the diameter of the mixing chamber is larger than the diameter of the compression chamber, and the diameter of the diffusion chamber gradually increases in the direction away from the mixing chamber.

[0012] By adopting the above technical solution, the motive steam enters the mixing chamber from the nozzle and is fully mixed with the air before entering the compression chamber. Because the pipe diameter of the mixing chamber is larger than the pipe diameter of the compression chamber, the compression speed of the mixed steam increases after entering the compression chamber. After reaching the diffusion chamber, the gradually increasing pipe diameter of the diffusion chamber reduces the speed of the mixed steam, and the pressure further increases, and is finally discharged at the exhaust port. The nozzle effectively increases the pressure that drops sharply after the motive steam and air are fully mixed.

[0013] Optionally, the silencer device includes a plurality of silencer plates, each of which is provided with silencer holes, and the plurality of silencer plates are bent to form a columnar shape and abutted in sequence, the silencer holes are staggered along the axis, one end of the plurality of silencer plates is connected to the compression chamber, and the other end of the plurality of silencer plates forms an exhaust port.

[0014] By adopting the above technical solution, a certain deviation is generated between the silencer holes of the silencer plate. Compared with the case where the silencer holes are directly abutting each other, the path of the mixed steam entering the holes is increased, the flow rate of the mixed steam is reduced, the sound absorption effect is further improved, and the low-frequency noise generated by the large-scale vortex formed by the mixed steam is effectively reduced.

[0015] Optionally, the silencer device further includes a hydrophobic collection layer and a hydrophobic channel, the hydrophobic collection layer abuts against the outer silencer plate, a cavity is provided in the hydrophobic collection layer, and the hydrophobic channel is connected to the hydrophobic collection layer.

[0016] During the silencing process of the silencer, a part of the mixed steam will move along the length direction of the silencer along the inner wall of the silencer, and during the movement, it will exchange heat with the silencer and convert itself into liquid water. The liquid water adheres to the inner wall of the silencer and eventually enters the next unit driven by the mixed steam, which affects the quality of the mixed steam. The liquid water adheres to the inner wall of the silencer and also reduces the silencing and noise reduction effect of the silencer. By adopting the above technical solution, the liquid water enters the hydrophobic collection layer from the holes in the silencer plate and is finally discharged from the device through the hydrophobic channel, thereby improving the quality of the steam while maintaining the silencing effect of the silencer.

[0017] Optionally, the noise reduction device includes a first polymer sound insulation material layer and a second polymer sound insulation material layer, and the first polymer sound insulation material is respectively sleeved on the outer walls of the nozzle and the hydrophobic collection layer.

[0018] By adopting the above technical solution, the first polymer sound insulation material layer and the second polymer sound insulation material layer are sequentially sleeved on the outer walls of the nozzle and the hydrophobic collection layer. The first polymer sound insulation material and the second polymer sound insulation material layer are combined to reduce noise, which can effectively remove the high-frequency noise generated by small-sized eddies in the device.

[0019] Optionally, the noise reduction device also includes a first aluminum silicate layer, a lead plate, a second aluminum silicate layer, a third aluminum silicate layer and a fourth polymer aluminum silicate layer. The first aluminum silicate layer, the lead plate, the second aluminum silicate layer, the first polymer sound insulation material layer, the third aluminum silicate layer, the second polymer sound insulation material layer and the fourth polymer aluminum silicate layer are sequentially arranged, and the first aluminum silicate layer is respectively arranged on the outer walls of the nozzle and the hydrophobic collection layer.

[0020] Polymer sound insulation materials can effectively reduce noise. However, direct contact between the polymer sound insulation material and the nozzle wall may cause heat radiation and the risk of fire. Heat radiation itself will also cause the polymer sound insulation material to age, reducing the noise reduction effect of the polymer sound insulation material. By adopting the above technical solution, the lead plate, the first polymer sound insulation material layer, and the second polymer material layer are all abutted with aluminum silicate layers on both sides. Aluminum silicate has a low thermal conductivity, is heat-absorbing and flame-retardant, and is light in weight. It has certain thermal insulation properties. While reducing the influence of heat radiation on the first polymer sound insulation material layer and the second polymer sound insulation material layer, its own porous structure can also perform certain sound absorption and noise reduction, further improving the noise reduction effect of the noise reduction device.

[0021] Optionally, the noise reduction device further includes a color steel outer protective plate, and the color steel outer protective plate is connected to the fourth aluminum silicate layer.

[0022] The noise reduction device is mainly composed of aluminum silicate materials and polymer materials, which have low strength and are relatively fragile when facing impact from sharp objects. By adopting the above technical solution, the color steel outer guard plate can improve the overall strength of the noise reduction device, protect the internal materials that mainly undertake the noise reduction function, and also fix the internal materials to prevent the internal structural layer from falling off during use and causing harm to relevant personnel. It is more practical, safer, and can adapt to more complex industrial environments.

[0023] Optionally, the thicknesses of the second aluminum silicate layer, the third aluminum silicate layer, and the fourth aluminum silicate layer are all equal, and the thickness of the first aluminum silicate layer is greater than the thickness of the second aluminum silicate layer.

[0024] During the movement of the mixed steam, the nozzle will exchange heat with the outside world to transfer heat, which makes it easy for the mixed steam to liquefy into liquid water. By adopting the above technical solution, the first aluminum silicate layer in direct contact with the outer wall of the nozzle adopts a thicker size, which is beneficial to reducing the thermal conductivity of the nozzle, while the second aluminum silicate layer, the third aluminum silicate layer and the fourth aluminum silicate layer adopt the same size to facilitate assembly and molding.

[0025] Optionally, the first aluminum silicate layer, the second aluminum silicate layer, the first polymer sound insulation material layer, the third aluminum silicate layer, the second polymer sound insulation material layer and the fourth aluminum silicate layer are formed by overlapping with pressed seams, and the first aluminum silicate layer, the second aluminum silicate layer, the third aluminum silicate layer and the fourth aluminum silicate layer are overlapped with staggered seams.

[0026] By adopting the above technical solution, each layer is formed by overlapping the corresponding material plates by pressing seams, which is convenient for molding and has lower cost than one-piece molded panels, and is convenient for later maintenance. The gaps produced by pressing seams are smaller than those produced by overlapping seams, which helps to improve the noise reduction and thermal insulation performance of the noise reduction device. The polymer sound insulation material layer has good flexibility, is easy to operate, and can adapt to uneven surfaces. The seams are pressed and overlapped at certain intervals and tied with steel belts to make the layers fit better, which is conducive to reducing the gaps between layers. The staggered overlaps between each layer are conducive to reducing stress concentration and making the performance of the noise reduction device more stable.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. The silencer plates of the silencer device in the present application are staggered and abutted, which increases the distance that the mixed steam enters the hole and reduces the flow rate of the mixed steam. The combined noise reduction of multiple silencer plates effectively reduces the low-frequency noise generated by the large-scale vortex formed by the mixed steam. The hydrophobic collection layer abutted on the outside of the silencer plate and the hydrophobic channel connected to the hydrophobic collection layer can discharge the liquid water in the device out of the device, which is beneficial to improving the quality of the mixed steam.

[0029] 2. The polymer sound insulation material in the present application has good flexibility, is easy to operate, and can adapt to uneven surfaces. The first polymer sound insulation material layer and the second polymer material layer are both abutted with an aluminum silicate layer. The aluminum silicate layer reduces the influence of thermal radiation on the first polymer sound insulation material layer and the second polymer sound insulation material layer, and its own porous structure can also perform certain sound absorption and noise reduction, further improving the noise reduction effect of the noise reduction device. The layers are formed by press-seaming and overlapping, which is lower in cost than the one-piece molded sound-absorbing and noise-reducing device. The same layers are press-seamed and overlapped at a certain distance and tied with steel belts to make the layers fit better, which is conducive to reducing the gaps between the layers. The staggered overlap between each layer is conducive to reducing stress concentration and making the performance of the noise reduction device more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the planar structure of the steam ejector in this application.

[0031] Figure 2 It is a schematic diagram of the planar unfolded structure of the sound-absorbing plate in this application.

[0032] Figure 3 It is a schematic diagram of the cross-sectional structure at the exhaust port in this application.

[0033] In the figure, 1. nozzle; 11. nozzle; 12. jet pipe; 121. power steam inlet; 13. nozzle; 14. nozzle actuator; 2. nozzle; 21. mixing chamber; 211. exhaust steam inlet; 22. compression chamber; 23. diffusion chamber; 3. silencer; 31. silencer plate; 311. silencer hole; 32. hydrophobic collection layer; 33. hydrophobic channel; 34. exhaust port; 4. noise reduction device; 41. first aluminum silicate layer; 42. lead plate; 43. second aluminum silicate layer; 44. first polymer sound insulation material layer; 45. third aluminum silicate layer; 46. second polymer sound insulation material layer; 47. fourth aluminum silicate layer; 48. color steel outer protective plate. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1 -Attached Figure 3 , further details of this application are given.

[0035] Example 1: Reference Figure 1 A steam ejector includes a nozzle 1, a nozzle 2, a silencer 3 and a noise reduction device 4. One end of the nozzle 2 is detachably connected to the nozzle 1 by a bolt, the silencer 3 is fixedly connected to the nozzle 2, and the noise reduction device 4 is respectively sleeved on the silencer 3 and the nozzle 2 and tied with a steel belt.

[0036] Reference Figure 1 The nozzle 2 includes a mixing chamber 21, a compression chamber 22 and a diffusion chamber 23. The two ends of the compression chamber 22 are fixedly connected to the mixing chamber 21 and the diffusion chamber 23 respectively. The two ends of the mixing chamber 21 are in a circular arc transition. An exhaust steam inlet 211 is provided at the lower end of the mixing chamber 21. The diameter of the mixing chamber 21 is larger than that of the compression chamber 22. The diameter of the diffusion chamber 23 starts from the fixed connection with the compression chamber 22 and gradually increases in the direction away from the mixing chamber 21.

[0037] Reference Figure 1 The nozzle 1 includes a nozzle 11, an air jet pipe 12, a nozzle needle 13 and a nozzle needle actuator 14. A power steam inlet 121 is opened on the upper side of one end of the air jet pipe 12, and the other side of the air jet pipe 12 is fixedly connected to the nozzle 11. The aperture sizes at both ends of the nozzle 11 gradually decrease along the middle direction of the nozzle 11, and the aperture size at the left end of the nozzle 11 is larger than the aperture size at the right end of the nozzle 11. The nozzle needle 13 is placed circumferentially along the air jet pipe 12 and passes through the air jet pipe 12, and the top of the nozzle needle 13 is located at the connection between the air jet pipe 12 and the nozzle 11. The top of the nozzle needle 13 is conical, and the nozzle needle actuator 14 is connected to the bottom end of the nozzle needle 13. Turning the valve on the nozzle needle actuator 14 can introduce or exhaust air to propel the regulating nozzle needle 13, thereby adjusting the forward and backward movement of the nozzle needle 13 to control the amount of steam entering.

[0038] Reference Figure 1 and Figure 2The silencer 3 includes a hydrophobic collection layer 32, a hydrophobic channel 33 and a plurality of silencer plates 31. The hydrophobic collection layer 32 is connected to the hydrophobic channel 33. The number of the silencer plates 31 can be two or more. In this embodiment, the number of the silencer plates 31 is 3. The three silencer plates 31 are all provided with silencer holes 311, and the silencer holes 311 are evenly distributed on the silencer plates 31. The three silencer plates 31 are bent to form a columnar shape, and the silencer holes 311 are staggered along the axis. One end of the plurality of silencer plates 31 is connected to the compression chamber 22, and the other end of the plurality of silencer plates 31 forms an exhaust port 34.

[0039] One end of the silencer plate 31 is connected to the compression chamber 22 , and the other end of the silencer plate 31 forms a steam exhaust port 34 . One side of the hydrophobic collection layer 32 abuts against the outermost silencer plate 31 .

[0040] Reference Figure 1 and Figure 3 The noise reduction device 4 includes a first aluminum silicate layer 41, a lead plate 42, a second aluminum silicate layer 43, a first polymer sound insulation material layer 44, a third aluminum silicate layer 45, a second polymer sound insulation material layer 46, a fourth aluminum silicate layer 47 and a color steel outer protective plate 48. The first aluminum silicate layer 41, the lead plate 42, the second aluminum silicate layer 43, the first polymer sound insulation material layer 44, the third aluminum silicate layer 45, the second polymer sound insulation material layer 46, the fourth aluminum silicate layer 47 and the color steel outer protective plate 48 are cylindrical. The cylindrical first aluminum silicate layer 41, the lead plate 42, the second aluminum silicate layer 43, the first polymer sound insulation material layer 44, the third aluminum silicate layer 45, the second polymer sound insulation material layer 46, the fourth aluminum silicate layer 47 and the color steel outer protective plate 48 are sequentially sleeved. The first aluminum silicate layer 41 is respectively sleeved on the outer tube wall of the nozzle 2 and the outer wall of the hydrophobic collection layer 32.

[0041] Reference Figure 1 and Figure 3 The thickness of the second aluminum silicate layer 43, the third aluminum silicate layer 45 and the fourth aluminum silicate layer 47 are all equal. The thickness of the first aluminum silicate layer 41 is greater than that of the second aluminum silicate layer 43. The multi-layer structure of the noise reduction device 4 is formed by overlapping the corresponding plates of each layer. After each layer of overlap is completed, the overlap is constructed to overlap the next layer. The overlap is convex. The first aluminum silicate layer 41, the second aluminum silicate layer 43, the third aluminum silicate layer 45 and the fourth aluminum silicate layer 47 are all made of rock wool. The first aluminum silicate layer 41, the second aluminum silicate layer 43, the third aluminum silicate layer 45 and the fourth aluminum silicate layer 47 are overlapped with each other and the staggered distance range is 100-300mm; the first polymer sound insulation material layer 44 and the second polymer sound insulation material layer 46 are formed by overlapping with pressed seams and tied with steel strips. In this embodiment, the overlap size is 100mm and the tying spacing is 400mm. The places where the pressed seams in the multi-layer structure are not tight are plugged tightly with aluminum silicate.

[0042] The implementation principle of the embodiment of the present application is: the motive steam enters the nozzle 2 from the motive steam inlet 121 and is finally ejected from the nozzle 11 at a reduced pressure and increased speed. The potential energy of the steam is converted into kinetic energy and is ejected into the mixing chamber 21 at a supersonic speed to mix with the air to form mixed steam. In this process, high-frequency noise and low-frequency noise are generated, among which the high-frequency noise is mainly caused by the small-sized vortex generated by the ejector body, and the low-frequency noise is mainly caused by the large-sized vortex generated during the movement of the mixed steam.

[0043] During the transmission of high-frequency noise, the first aluminum silicate layer 41, the second aluminum silicate layer 43, the third aluminum silicate layer 45, the fourth aluminum silicate layer 47, the first polymer sound insulation material layer 44, and the second polymer sound insulation material layer 46 in the noise reduction device 4 are overlapped and formed by steel strapping, which reduces the cost compared with the one-piece noise reduction device, facilitates subsequent disassembly and maintenance, and absorbs high-frequency noise, effectively reducing high-frequency noise. In addition, the first aluminum silicate layer 41, the second aluminum silicate layer 43, the third aluminum silicate layer 45, and the fourth aluminum silicate layer 47 are used in the noise reduction. At the same time, it also has the effect of absorbing heat and flame retardant, has strong thermal insulation ability, reduces the rate at which the mixed steam condenses into liquid water, and the silencer plates 31 in the silencer 3 are staggered and abutted, which increases the path of the mixed steam entering the hole, reduces the flow rate of the mixed steam, and further improves the sound absorption effect, effectively reducing the low-frequency noise generated by the large-scale vortex formed by the mixed steam. The hydrophobic collection layer 32 and the hydrophobic channel 33 in the silencer 3 guide the liquid water converted during the movement of the mixed steam out of the device, thereby reducing noise while ensuring the quality of the mixed steam.

[0044] The examples of this specific embodiment are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, any equivalent changes made based on the structure, shape, and principle of this application should be included in the scope of protection of this application.

Claims

1. A steam ejector, comprising a nozzle (1) and a nozzle (2), wherein one end of the nozzle (2) is detachably connected to the nozzle (1), and characterized in that: A steam ejector further comprises a silencer (3) and a noise reduction device (4), wherein the silencer (3) and the noise reduction device (4) are multi-layer structures formed by a plurality of sleeves abutting each other in sequence, the silencer (3) is used to reduce low-frequency noise, and the noise reduction device (4) is used to reduce high-frequency noise, the silencer (3) is fixedly connected to the nozzle (2), and the noise reduction device (4) is detachably connected to the silencer (3) and the nozzle (2) respectively; The muffler device (3) includes a plurality of muffler plates (31), each of which is provided with a muffler hole (311), wherein the plurality of muffler plates (31) are bent to form a columnar shape and abut against each other in sequence, wherein the muffler hole (311) is staggered along an axis, and one end of each of the plurality of muffler plates (31) is connected to the nozzle (2), and the other end of each of the plurality of muffler plates (31) forms a steam exhaust port (34); The silencer (3) further comprises a hydrophobic collection layer (32) and a hydrophobic channel (33), wherein the hydrophobic collection layer (32) abuts against the outer silencer plate (31), a cavity is provided in the hydrophobic collection layer (32), and the hydrophobic channel (33) is in communication with the hydrophobic collection layer (32); The noise reduction device (4) comprises a first polymer sound insulation material layer (44) and a second polymer sound insulation material layer (46), wherein the first polymer sound insulation material layer (44) is respectively sleeved on the outer walls of the nozzle (2) and the hydrophobic collection layer (32); The noise reduction device (4) further comprises a first aluminum silicate layer (41), a lead plate (42), a second aluminum silicate layer (43), a third aluminum silicate layer (45) and a fourth aluminum silicate layer (47), wherein the first aluminum silicate layer (41), the lead plate (42), the second aluminum silicate layer (43), the first polymer sound insulation material layer (44), the third aluminum silicate layer (45), the second polymer sound insulation material layer (46) and the fourth aluminum silicate layer (47) are sequentially sleeved, and the first aluminum silicate layer (41) is sleeved on the outer wall of the nozzle (2) and the hydrophobic collection layer (32); The thicknesses of the second aluminum silicate layer (43), the third aluminum silicate layer (45), and the fourth aluminum silicate layer (47) are all equal, and the thickness of the first aluminum silicate layer (41) is greater than the thickness of the second aluminum silicate layer (43).

2. A steam ejector according to claim 1, characterized in that: The nozzle (1) includes a nozzle (11), an air jet pipe (12), a nozzle needle (13) and a nozzle needle actuator (14). One end of the air jet pipe (12) is provided with a power steam inlet (121). The other side of the air jet pipe (12) is connected to the nozzle (11). The top end of the nozzle needle (13) is conical. The nozzle needle (13) passes through the air jet pipe (12) and the top end of the nozzle needle (13) is located at the connection between the air jet pipe (12) and the nozzle (11). The nozzle needle actuator (14) is connected to the nozzle needle (13). The nozzle needle actuator (14) can control the nozzle needle (13) to move along the length direction of the air jet pipe (12).

3. A steam ejector according to claim 1, characterized in that: The nozzle (2) includes a mixing chamber (21), a compression chamber (22) and a diffusion chamber (23), the two ends of the compression chamber (22) are respectively connected to the mixing chamber (21) and the diffusion chamber (23), the lower end of the mixing chamber (21) is provided with an exhaust steam inlet (211), the diameter of the mixing chamber (21) is larger than the diameter of the compression chamber (22), and the diameter of the diffusion chamber (23) gradually increases in a direction away from the mixing chamber (21).

4. A steam ejector according to claim 1, characterized in that: The noise reduction device (4) further comprises a color steel outer protective plate (48), wherein the color steel outer protective plate (48) is connected to the fourth aluminum silicate layer (47).

5. A steam ejector according to claim 4, characterized in that: The first aluminum silicate layer (41), the second aluminum silicate layer (43), the first polymer sound insulation material layer (44), the third aluminum silicate layer (45), the second polymer sound insulation material layer (46) and the fourth aluminum silicate layer (47) are formed by overlapping with pressed seams, and the first aluminum silicate layer (41), the second aluminum silicate layer (43), the third aluminum silicate layer (45) and the fourth aluminum silicate layer (47) are overlapped with staggered seams.

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