Steam ejector with adjustable steam flow

Abstract

The utility model relates to a steam ejector with adjustable steam flow, and belongs to the technical field of heat energy power equipment. Comprising an ejector body, a Laval nozzle, a steam flow adjusting device, a high-parameter steam inlet, a low-parameter steam inlet and a mixed steam outlet, the steam flow adjusting device is arranged on a nozzle inlet pipeline at the front end of the Laval nozzle, and the steam flow adjusting device comprises a main transmission shaft penetrating through the side wall of the pipeline; the auxiliary transmission shafts and the main transmission shaft are uniformly distributed in the circumferential direction of the nozzle inlet pipeline; the transmission rod is connected with the main transmission shaft and the auxiliary transmission shaft; the supporting piece is fixed on the inner wall of the pipeline; each baffle rotating shaft is coaxially connected with the main transmission shaft or the auxiliary transmission shaft; the main transmission shaft drives the auxiliary transmission shaft to rotate synchronously through the transmission rod. The main transmission shaft and the auxiliary transmission shaft jointly control the opening and closing angles of all the adjusting baffles. The multi-baffle adjusting mechanism is arranged on the steam inlet pipeline at the front end of the nozzle, so that the problem of abrasion and jamming caused by high-speed steam scouring of a traditional structure is solved; the design of multi-baffle cooperative load dispersion remarkably reduces driving resistance, and torque overload is avoided.

Description

Technical Field

[0001] This utility model relates to the field of thermal power equipment technology, and in particular to a steam ejector with adjustable steam flow. Background Technology

[0002] Steam ejectors, as core energy-saving equipment in the thermal power field, are widely used in industries such as power and chemical engineering. They use high-pressure steam to inject low-pressure steam, mix them, and output medium-pressure steam to achieve waste heat recovery and parameter enhancement. Traditional steam ejectors use fixed-diameter Laval nozzles, resulting in non-adjustable high-pressure steam flow, which cannot adapt to varying operating conditions. With technological advancements, adjustable steam ejectors have gradually emerged. By incorporating adjustment mechanisms within the nozzle to change the flow area, typical examples include conical ejector structures (such as CN101829639A) and arc-shaped liner structures (such as CN101239341A).

[0003] However, the existing adjustable structure has significant drawbacks: First, although the conical ejector pin scheme changes the annular flow area through axial displacement, it has strict requirements for manufacturing precision. Impurities in the steam can easily cause the ejector pin to jam, resulting in a high failure rate on site. Second, the arc liner scheme relies on the opening and closing of the liner to adjust the flow cross section. However, under high pressure conditions, the adjustment torque is too large, far exceeding the bearing limit of conventional actuators, and frequently causing motor overload damage.

[0004] Therefore, a new type of regulating structure is urgently needed to completely solve the problems of reliability and torque overload while ensuring flow accuracy. Summary of the Invention

[0005] This utility model aims to provide a steam ejector with adjustable steam flow. By placing the multi-baffle linkage adjustment mechanism in front of the nozzle inlet pipe, the direct impact of high-speed steam on moving parts is avoided. At the same time, the multi-baffle collaboratively shares the load, significantly reducing the driving resistance and solving the jamming and torque overload problems of traditional adjustable steam ejectors.

[0006] To solve the above-mentioned technical problems, the technical solution proposed in this application is as follows:

[0007] A steam ejector with adjustable steam flow rate includes an ejector body, a Laval nozzle, a steam flow rate regulating device, a high-parameter steam inlet, a low-parameter steam inlet, and a mixed steam outlet.

[0008] A steam flow regulating device is provided on the nozzle inlet pipe at the front end of the Laval nozzle, the steam flow regulating device comprising:

[0009] The main drive shaft penetrates the sidewall of the pipe;

[0010] At least three auxiliary drive shafts are evenly distributed around the nozzle inlet pipe along the circumference of the main drive shaft.

[0011] The transmission rod that connects the main drive shaft and the auxiliary drive shaft;

[0012] Support components fixed to the inner wall of the pipe;

[0013] There are no fewer than four adjusting baffles, and the rotating shaft of each baffle is coaxially connected to the main drive shaft or the auxiliary drive shaft; wherein, the main drive shaft drives the auxiliary drive shaft to rotate synchronously through a transmission rod;

[0014] The main drive shaft and the auxiliary drive shaft together control the opening and closing angles of all adjusting baffles.

[0015] Furthermore, the number of adjusting baffles is at least four, evenly distributed along the circumference of the nozzle inlet pipe.

[0016] Furthermore, the edge of the adjusting baffle is provided with a stepped sealing groove, and a hard alloy sealing strip or a carbon ring sealing strip is embedded in the groove.

[0017] Furthermore, the support member has an embedded groove, and the adjusting baffle shaft is embedded in the groove to support the regular movement of the adjusting baffle.

[0018] Furthermore, it also includes a drive system, comprising:

[0019] Electric actuators;

[0020] A transmission device that connects the electric actuator to the main drive shaft;

[0021] The transmission device is a worm gear mechanism, with the worm wheel fixed to the outer end of the main drive shaft and the worm connected to the output shaft of the electric actuator.

[0022] Compared with the prior art, the steam ejector with adjustable steam flow rate of the present invention achieves the following beneficial technical effects:

[0023] This invention overcomes the wear and jamming problem of traditional steam ejector regulating components in high-speed steam environments through a front-mounted multi-baffle linkage mechanism; the multi-baffle collaborative load-dispersing design significantly reduces driving resistance and completely avoids the risk of torque overload; the baffle opening degree is highly linearly correlated with the steam flow rate, achieving continuous and precise adjustment; the integrated structure replaces external valves, reducing leakage points and improving system reliability, and significantly extending the service life of the equipment. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of a steam ejector with adjustable steam flow rate provided in an embodiment of the present invention.

[0026] Figure 2 This is a schematic diagram of a steam flow regulating device for an adjustable steam ejector, provided as an embodiment of the present invention.

[0027] Figure 3 This is a schematic diagram of a steam ejector with adjustable steam flow rate in the off state, provided as an embodiment of the present invention.

[0028] Figure 4 This is a schematic diagram of a steam ejector with adjustable steam flow rate in the open state, provided as an embodiment of the present invention. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] like Figure 1-4 As shown in the embodiments of this application, a steam ejector with adjustable steam flow includes an ejector body 1, a Laval nozzle 2, a steam flow regulating device 4, a high-parameter steam inlet 12, a low-parameter steam inlet 13, and a mixed steam outlet 14.

[0031] A steam flow regulating device 4 is provided on the nozzle inlet pipe 3 at the front end of the Laval nozzle 2. The steam flow regulating device 4 includes:

[0032] Main drive shaft 5, penetrating the sidewall of the pipe;

[0033] At least three auxiliary drive shafts 6 are evenly distributed around the nozzle inlet pipe along the circumference of the main drive shaft 5.

[0034] The transmission rod 7 connects the main drive shaft 5 and the auxiliary drive shaft 6;

[0035] Support component 8, fixed to the inner wall of the pipe;

[0036] No fewer than four adjusting baffles 9, each baffle's rotating shaft being coaxially connected to the main drive shaft 5 or the auxiliary drive shaft 6;

[0037] Among them, the main drive shaft 5 drives the auxiliary drive shaft 6 to rotate synchronously through the drive rod 7;

[0038] The main drive shaft 5 and the auxiliary drive shaft 6 together control the opening and closing angles of all adjusting baffles 9.

[0039] In the embodiments of this application, the number of the adjusting baffles 9 is at least four, which are evenly distributed around the nozzle inlet pipe 3.

[0040] In the embodiments of this application, the edge of the adjusting baffle 9 is provided with a stepped sealing groove, and a hard alloy sealing strip or a carbon ring sealing strip is embedded in the groove.

[0041] In the embodiments of this application, the support member 8 is embedded in a groove, and the adjusting baffle shaft is embedded in the groove to support the regular movement of the adjusting baffle.

[0042] In embodiments of this application, a driving system is also included, comprising:

[0043] Electric actuator 10;

[0044] A transmission device 11 that connects the electric actuator 10 to the main drive shaft 5;

[0045] The transmission device 11 is a worm gear mechanism, with the worm gear fixed to the outer end of the main drive shaft 5 and the worm connected to the output shaft of the electric actuator 10.

[0046] During the operation of the steam ejector with adjustable steam flow, high-parameter steam enters the steam ejector 1 through the high-parameter steam inlet 12. After the flow rate is adjusted by the steam flow regulating device 4, it enters the Laval nozzle 2 to generate supersonic steam flow, which creates a negative pressure zone in the surrounding chamber of the nozzle. This attracts low-parameter steam to enter the steam ejector 1 through the low-parameter steam inlet 13. After the two types of steam are fully mixed in the steam ejector 1, they become medium-parameter steam and are discharged through the mixed steam outlet 14.

[0047] When the steam ejector is working, the electric actuator 10 is activated, transmitting torque to the main drive shaft 5 of the steam flow regulating device 4 via the external transmission device 11. The main drive shaft 5 then transmits the torque to the auxiliary drive shaft 6 via the transmission rod 7. Both the main drive shaft 5 and the auxiliary drive shaft 6 rotate simultaneously, driving the regulating baffle 9 to open and close, thereby adjusting the high-parameter steam flow and achieving "variable operating condition" operation of the steam ejector. Depending on the degree of opening and closing of the regulating baffle 9 within the steam flow regulating device 4, the steam ejector 1 can exhibit two operating states. Figure 3 and Figure 4The steam flow regulating device 4 is illustrated with the states of the regulating baffle 9 being "fully closed" and "fully open". When the regulating baffle 9 is in the "fully closed" state, no steam enters the high-parameter steam inlet 12 of the steam ejector 1, and the steam ejector 1 is in a stopped state. When the steam ejector 1 needs to be put into operation, the electric actuator 10 is activated, the regulating baffle 9 is opened, and high-parameter steam enters. The opening angle of the regulating baffle 9 is adjusted according to the operating conditions to achieve "variable operating condition steam intake". When the regulating baffle 9 is in the "fully open" state, the high-parameter steam flow is not restricted, and the steam ejector 1 operates at full load. This innovative design, which uses the electric actuator 10 to control the opening angle of the regulating baffle 9 to precisely regulate the high-parameter steam flow, enables the steam ejector to operate stably under different operating conditions, significantly improving energy utilization efficiency, and has great application potential in fields such as industrial waste heat recovery and power cycle systems.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A steam injector with adjustable steam flow, characterized by: It includes an injector body (1), a Laval nozzle (2), a steam flow regulating device (4), a high-parameter steam inlet (12), a low-parameter steam inlet (13), and a mixed steam outlet (14). A steam flow regulating device (4) is provided on the nozzle inlet pipe (3) at the front end of the Laval nozzle (2), and the steam flow regulating device (4) includes: The main drive shaft (5) penetrates the side wall of the pipe; At least three auxiliary drive shafts (6) are evenly distributed along the circumference of the nozzle inlet pipe, along with the main drive shaft (5); The transmission rod (7) connects the main drive shaft (5) and the auxiliary drive shaft (6); Support (8) fixed to the inner wall of the nozzle inlet pipe; No fewer than four adjusting baffles (9), each baffle's rotating shaft being coaxially connected to the main drive shaft (5) or the auxiliary drive shaft (6); Among them, the main drive shaft (5) drives the auxiliary drive shaft (6) to rotate synchronously through the drive rod (7); The main drive shaft (5) and the auxiliary drive shaft (6) together control the opening and closing angles of all adjusting baffles (9).

2. The steam ejector according to claim 1, characterized in that: The number of the adjusting baffles (9) is at least four, and they are evenly distributed around the nozzle inlet pipe (3).

3. The steam ejector according to claim 1 or 2, characterized in that: The edge of the adjusting baffle (9) is provided with a stepped sealing groove, and a hard alloy sealing strip or a carbon ring sealing strip is embedded in the groove.

4. The steam ejector according to claim 1, characterized in that: The support member (8) has an embedded groove, and the adjusting baffle shaft is embedded in the groove to support the regular movement of the adjusting baffle.

5. The steam ejector according to claim 1, characterized in that: It also includes the drive system, including: Electric actuator (10); A transmission device (11) that connects the electric actuator (10) to the main drive shaft (5); The transmission device (11) is a worm gear mechanism. The worm gear is fixed to the outer end of the main transmission shaft (5), and the worm is connected to the output shaft of the electric actuator (10).

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