Steam inlet system of steam turbine

Abstract

The utility model relates to a steam turbine steam admission system, it relates to steam turbine steam admission field, it includes machine body, steam delivery pipe, first steam admission mechanism, second steam admission mechanism and regulating mechanism, steam delivery pipe is provided on machine body, first steam admission mechanism includes first steam outlet pipe and first pressure regulating subassembly, the machine body is provided with first steam admission passage, second steam admission passage is provided with second steam admission passage, second steam admission passage is provided with second steam admission passage. The first pressure adjusting assembly comprises a first pressure adjusting seat and a first pressure adjusting rod, the first pressure adjusting seat is arranged on the machine body, the first pressure adjusting rod is arranged on the machine body in a sliding mode, and the first steam outlet pipe is arranged on the machine body. According to the steam turbine, the effect of stabilizing the flow of steam input into the steam conveying pipe is achieved, and then the steam entering the steam turbine is more stable.

Description

Technical Field

[0001] The utility model relates to the field of steam turbine steam inlet, in particular to a steam turbine steam inlet system. Background Art

[0002] With the rapid development of modern industry, steam turbines, as important power equipment, play a key role in many fields. The steam inlet system of steam turbine is one of its core components, which directly affects the performance and operation efficiency of steam turbine.

[0003] By optimizing the structural design of the steam inlet system, improving the accuracy of steam inlet regulation, and enhancing sealing performance, we can achieve more efficient operation, lower energy consumption, and better reliability of the steam turbine to meet the growing needs of modern industry.

[0004] At present, a Chinese patent application with publication number CN220909776U and publication date May 7, 2024 proposes a single-sided double steam inlet volute of a steam turbine, including: an elliptical annular volute flow passage, the cross-sectional size of the volute flow passage gradually decreases along the flow direction of the airflow, and the upper or lower part of the volute flow passage is provided with a first steam inlet duct and a second steam inlet duct arranged on the same side, one end of the first steam inlet duct and the second steam inlet duct are connected to the steam inlet side of the volute flow passage after merging, and the other ends of the first steam inlet duct and the second steam inlet duct are respectively the first volute steam inlet and the second volute steam inlet, which are arranged on both sides of the vertical center line of the volute.

[0005] When in use, the steam transport is completed through the first steam inlet pipeline and the second steam inlet pipeline in cooperation with the first volute steam inlet and the second volute steam inlet.

[0006] With regard to the above-mentioned related technologies, in the process of bidirectional steam transmission, if the two steam passages actually input into the steam turbine have uneven steam pressure distribution at the steam inlet source, the steam inlet at both ends of the steam turbine may produce different feed forces under the condition of pressure imbalance, thereby affecting the overall rotation accuracy of the steam turbine. In severe cases, it will increase the burden on the steam turbine and cause instability. Utility Model Content

[0007] In order to improve the steam inlet stability of a steam turbine, the utility model provides a steam inlet system for a steam turbine.

[0008] The utility model provides a steam turbine steam inlet system, which adopts the following technical solutions:

[0009] A steam turbine steam inlet system comprises a machine body, a steam delivery pipe, a first steam inlet mechanism, a second steam inlet mechanism and a regulating mechanism, wherein the steam delivery pipe is arranged on the machine body, the first steam inlet mechanism comprises a first steam outlet pipe and a first pressure regulating assembly, a first steam inlet passage is opened on the machine body, the first pressure regulating assembly comprises a first pressure regulating seat and a first pressure regulating rod, the first pressure regulating seat is arranged on the machine body, the first pressure regulating rod is slidably arranged on the machine body, and the first steam outlet pipe is arranged on the machine body;

[0010] The second steam inlet mechanism includes a second steam outlet pipe and a second pressure regulating assembly. The body is provided with a second steam inlet passage. The second pressure regulating assembly includes a second pressure regulating seat and a second pressure regulating rod. The second pressure regulating seat is provided on the body. The first pressure regulating rod is slidably provided on the body. The second steam outlet pipe is provided on the body.

[0011] The regulating mechanism is arranged on the machine body, the regulating mechanism is connected with the first pressure regulating rod and the second pressure regulating rod, and the regulating mechanism is communicated with the first steam outlet pipe and the second steam outlet pipe.

[0012] By adopting the above technical scheme, when the steam turbine is supplied with steam in both directions, the steam enters the steam separation chamber in the body through the steam transmission pipe, and then the steam in the first steam inlet channel enters the first steam outlet pipe through the first pressure regulating seat and the first pressure regulating rod, and the steam in the second steam inlet channel enters the second steam outlet pipe through the second pressure regulating seat and the second pressure regulating rod; part of the steam in the first steam outlet pipe enters the regulating mechanism, so that the regulating mechanism adjusts the second pressure regulating rod, and part of the steam in the second steam outlet pipe enters the regulating mechanism, so that the regulating mechanism adjusts the first pressure regulating rod, so that when the steam pressure at one end increases, the steam pressure at the other end can be increased at the same time through the regulating mechanism, and under the influence of each other's pressures, automatic adjustment is achieved, so that the steam pressures at both ends tend to be balanced, thereby achieving the effect of stabilizing the flow of the steam input in the steam transmission pipe, and making the steam entering the steam turbine more stable.

[0013] Optionally, the regulating mechanism includes a shell and an intermediate plate, the shell is arranged on the machine body, an regulating chamber is opened in the shell, the intermediate plate is arranged in the shell, the intermediate plate divides the regulating chamber into a first regulating chamber and a second regulating chamber, one end of the first pressure regulating rod is slidably arranged on the shell, the first pressure regulating rod is in the first regulating chamber, the second steam outlet pipe is connected to the first regulating chamber, one end of the second pressure regulating rod is slidably arranged on the shell, the second pressure regulating rod is in the second regulating chamber, and the first steam outlet pipe is connected to the second regulating chamber.

[0014] By adopting the above technical solution, when the first pressure regulating assembly and the second pressure regulating assembly are adjusted, the steam in the second steam outlet pipe enters the first regulating chamber, pushing the first pressure regulating rod to move on the machine body, and the steam in the first steam outlet pipe enters the second regulating chamber, pushing the second pressure regulating rod to move on the machine body.

[0015] If the steam pressure in the second steam outlet pipe changes, the position of the first pressure regulating rod will change, thereby adjusting the medium steam pressure in the first steam outlet pipe; if the steam pressure in the first steam outlet pipe changes, the position of the second pressure regulating rod will change, thereby adjusting the steam pressure in the second steam outlet pipe. Under the influence of the regulating mechanism, the steam pressures in the first steam outlet pipe and the second steam outlet pipe will automatically adjust and balance, so that the steam outlet pressures in the first steam outlet pipe and the second steam outlet pipe can change synchronously, thereby improving the stability of the steam inlet and reducing the pressure difference of the steam inlet.

[0016] Optionally, the regulating mechanism also includes a first regulating membrane and a second regulating membrane, the first regulating membrane is arranged on a shell in the first regulating chamber, one end of the first regulating membrane is connected to a first pressure regulating rod, the second regulating membrane is arranged on a shell in the second regulating chamber, one end of the second regulating membrane is connected to a second pressure regulating rod.

[0017] By adopting the above technical solution, when the pressure in the first regulating chamber changes, the first regulating membrane can be deformed, thereby adjusting the displacement of the first regulating rod. When the pressure in the second regulating chamber changes, the second regulating membrane can be deformed, thereby adjusting the displacement of the second regulating rod. This achieves a more accurate response to the positions of the first regulating rod and the second regulating rod, thereby improving the accuracy of pressure regulation.

[0018] Optionally, the regulating mechanism also includes a first connecting tube, a first elastic membrane, a second connecting tube and a second elastic membrane, one end of the first connecting tube is connected to the first regulating chamber, the other end of the first connecting tube is connected to the second steam outlet pipe, and the first elastic membrane is arranged in the first connecting tube; one end of the second connecting tube is connected to the second regulating chamber, the other end of the second connecting tube is connected to the first steam outlet pipe, and the second elastic membrane is arranged in the second connecting tube.

[0019] By adopting the above technical scheme, when the pressure in the second steam outlet pipe changes, the first elastic membrane is deformed according to the pressure, and is connected with the first regulating chamber through the first connecting pipe, thereby adjusting the pressure in the first regulating chamber. When the pressure in the first steam outlet pipe changes, the second elastic membrane is deformed according to the pressure, and is connected with the second regulating chamber through the second connecting pipe, thereby adjusting the pressure in the second regulating chamber. The first elastic membrane isolates the first regulating chamber from the second steam outlet pipe, and the second elastic membrane isolates the second regulating chamber from the first steam outlet pipe. Under the premise of being able to transmit pressure, the steam is isolated, thereby reducing the possibility of steam generating droplets after the temperature is reduced and accumulating in the first regulating chamber or the second regulating chamber, thereby reducing the influence of steam droplets on the regulating pressure.

[0020] Optionally, the first pressure regulating assembly further comprises a first pressure regulating spring, one end of the first pressure regulating spring is arranged on the first pressure regulating seat, and the other end of the first pressure regulating spring is arranged on the first pressure regulating rod;

[0021] The second pressure regulating assembly also includes a second pressure regulating spring, one end of the second pressure regulating spring is arranged on the second pressure regulating seat, and the other end of the second pressure regulating spring is arranged on the second pressure regulating rod.

[0022] By adopting the above technical solution, during the movement of the first pressure regulating rod or the second pressure regulating rod, the first pressure regulating spring or the second pressure regulating spring can provide a certain elastic force to assist the movement of the first pressure regulating rod or the second pressure regulating rod, making the pressure regulation more precise.

[0023] Optionally, the first pressure regulating assembly further comprises a first telescopic cylinder, the first telescopic cylinder is arranged on the machine body, and the other end of the first telescopic cylinder is connected to a first pressure regulating spring;

[0024] The second pressure regulating assembly further comprises a second telescopic cylinder, which is arranged on the machine body, and the other end of the second telescopic cylinder is connected to a second pressure regulating spring.

[0025] By adopting the above technical scheme, when dealing with steam outlet pressures in different working conditions, the elastic force of the first spring is adjusted by adjusting the telescopic length of the first telescopic cylinder, and the elastic force of the second spring is adjusted by adjusting the telescopic length of the second telescopic cylinder, thereby achieving adjustment of the pressure regulating capacity of the first pressure regulating rod and the second pressure regulating rod, thereby being able to adapt to different pressure regulating working conditions and improving the practicability of the device.

[0026] Optionally, steam holes are provided on the first pressure regulating seat, the first pressure regulating rod, the second pressure regulating seat and the second pressure regulating rod.

[0027] By adopting the above technical scheme, steam can be transported and regulated through the vent holes. When the steam pressure at one end surges and exceeds the standard, the vent holes can be misaligned to reduce or block the steam flow through the regulating mechanism, so that the other end can stop steam transmission in time. At the same time, the regulating mechanism blocks the steam flow at this end, thereby reducing the possibility of damage to the steam turbine caused by a surge in steam pressure and improving the safety of steam intake.

[0028] Optionally, a preheating mechanism is provided on the machine body, and the preheating mechanism includes a preheating shell, a heat preservation layer and a heating plate. The preheating shell is arranged on the machine body, the heat preservation layer is arranged on the preheating shell and the machine body, and the heating plate is arranged in the preheating shell.

[0029] By adopting the above technical solution, before steam transmission, the machine body is heated by the preheating mechanism to evaporate the steam droplets remaining in the machine body, thereby reducing the influence of the steam droplets on the regulating mechanism and improving the pressure regulation accuracy.

[0030] In summary, the present invention includes at least one of the following beneficial technical effects:

[0031] By setting up an adjustment mechanism, the steam pressure at both ends can be increased or decreased at the same time. Under the mutual influence of pressure, automatic adjustment is achieved, so that the steam pressure at both ends tends to be balanced, thereby achieving the effect of stabilizing the flow of steam input in the steam pipe, and making the steam entering the steam turbine more stable.

[0032] By providing the first adjustment film and the second adjustment film, it is possible to more accurately reflect the positions of the first adjustment rod and the second adjustment rod, thereby improving the accuracy of pressure regulation.

[0033] By providing vents, the possibility of damage to the steam turbine due to a surge in steam pressure is reduced, and the safety of steam intake is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the overall structure of the embodiment of the utility model after the heat insulation layer is discharged;

[0035] Figure 2 yes Figure 1 Schematic cross-sectional view of AA in the figure;

[0036] Figure 3 yes Figure 2 A partial enlarged schematic diagram of part B;

[0037] Figure 4 yes Figure 2 A partial enlarged schematic diagram of part C in the middle.

[0038] Description of reference numerals: 100, machine body; 110, steam delivery pipe; 200, first steam inlet mechanism; 210, first steam outlet pipe; 220, first pressure regulating assembly; 221, first pressure regulating seat; 222, first pressure regulating rod; 223, first pressure regulating spring; 224, first telescopic cylinder; 230, first steam inlet passage; 300, second steam inlet mechanism; 310, second steam outlet pipe; 320, second pressure regulating assembly; 321, second pressure regulating seat; 322, second pressure regulating rod; 323, second telescopic cylinder; 324 , second pressure-regulating spring; 330, second steam inlet channel; 400, steam hole; 500, regulating mechanism; 510, shell; 520, middle plate; 530, first regulating membrane; 540, second regulating membrane; 550, first connecting pipe; 560, first elastic membrane; 570, second connecting pipe; 580, second elastic membrane; 590, regulating chamber; 591, first regulating chamber; 592, second regulating chamber; 600, preheating mechanism; 610, preheating shell; 620, insulation layer; 630, heating plate. DETAILED DESCRIPTION

[0039] The following combination Figures 1 to 4 The utility model is described in further detail.

[0040] The utility model embodiment discloses a steam turbine steam inlet system. Figures 1 to 4 A steam turbine steam inlet system mainly includes a body 100, a steam transmission pipe 110, a first steam inlet mechanism 200, a second steam inlet mechanism 300, a regulating mechanism 500 and a preheating mechanism 600. The steam transmission pipe 110, the first steam inlet mechanism 200, the second steam inlet mechanism 300, the regulating mechanism 500 and the preheating mechanism 600 are all arranged on the body 100. The treated steam is transmitted through the first steam inlet mechanism 200 and the second steam inlet mechanism 300, and the steam is transmitted out after being regulated by the regulating mechanism 500, so as to achieve the effect of stabilizing the flow of the steam input in the steam transmission pipe 110, thereby making the steam entering the steam turbine more stable.

[0041] Reference Figures 1 to 3 The first steam inlet mechanism 200 includes a first steam outlet pipe 210 and a first pressure regulating assembly 220. The body 100 is provided with a first steam inlet channel 230. The first pressure regulating assembly 220 includes a first pressure regulating seat 221, a first pressure regulating rod 222, a first pressure regulating spring 223, and a first telescopic cylinder 224. The first pressure regulating seat 221 is arranged on the body 100. The first pressure regulating rod 222 is slidably arranged on the body 100. One end of the first pressure regulating spring 223 is arranged on the first pressure regulating seat 221. The other end of the first pressure regulating spring 223 is arranged on the first pressure regulating rod 222. The first telescopic cylinder 224 is arranged on the body 100. The other end of the first telescopic cylinder 224 is connected to the first pressure regulating spring 223. The first steam outlet pipe 210 is arranged on the body 100.

[0042] Reference Figure 1 , Figure 2 and Figure 4 The second steam inlet mechanism 300 includes a second steam outlet pipe 310 and a second pressure regulating assembly 320. A second steam inlet channel 330 is opened on the body 100, and the second steam outlet pipe 310 is arranged on the body 100; the second pressure regulating assembly 320 includes a second pressure regulating seat 321, a second pressure regulating rod 322, a second telescopic cylinder 323 and a second pressure regulating spring 324. The second pressure regulating seat 321 is arranged on the body 100, and the first pressure regulating rod 222 is slidably arranged on the body 100. One end of the second pressure regulating spring 324 is arranged on the second pressure regulating seat 321, and the other end of the second pressure regulating spring 324 is arranged on the second pressure regulating rod 322. The second telescopic cylinder 323 is arranged on the body 100, and the other end of the second telescopic cylinder 323 is connected to the second pressure regulating spring 324.

[0043] The first pressure regulating seat 221 , the first pressure regulating rod 222 , the second pressure regulating seat 321 and the second pressure regulating rod 322 are all provided with steam holes 400 .

[0044] During the movement of the first pressure regulating rod 222 or the second pressure regulating rod 322, the first pressure regulating spring 223 or the second pressure regulating spring 324 can provide a certain elastic force to assist the movement of the first pressure regulating rod 222 or the second pressure regulating rod 322, so that the pressure regulation is more precise. When dealing with the steam outlet pressure under different working conditions, the elastic force of the first spring is adjusted by adjusting the telescopic length of the first telescopic cylinder 224, and the elastic force of the second spring is adjusted by adjusting the telescopic length of the second telescopic cylinder 323, so as to adjust the pressure regulating capacity of the first pressure regulating rod 222 and the second pressure regulating rod 322, so as to be applicable to different pressure regulating working conditions, thereby improving the practicality of the device. The steam is transported and regulated through the vent hole. When the steam pressure at one end surges and exceeds the standard, the vent hole is dislocated to reduce or block the steam flow through the regulating mechanism 500, so that the other end can stop steam transmission in time. At the same time, the regulating mechanism 500 blocks the steam flow at this end, thereby reducing the possibility of damage to the steam turbine caused by a surge in steam pressure, thereby improving the safety of steam intake.

[0045] Reference Figure 2, the regulating mechanism 500 has a shell 510, an intermediate plate 520, a first regulating membrane 530, a second regulating membrane 540, a first connecting pipe 550, a first elastic membrane 560, a second connecting pipe 570 and a second elastic membrane 580, the shell 510 is arranged on the body 100, an regulating chamber 590 is opened in the shell 510, the intermediate plate 520 is arranged in the shell 510, the intermediate plate 520 divides the regulating chamber 590 into a first regulating chamber 591 and a second regulating chamber 592, one end of the first pressure regulating rod 222 is slidably arranged on the shell 510, the first pressure regulating rod 222 is in the first regulating chamber 591, the first steam outlet pipe 210 is connected to the first regulating chamber 591, one end of the second pressure regulating rod 322 is slidably arranged on the shell 510, and the second pressure regulating rod 322 is in the second regulating chamber 59 2, the second steam outlet pipe 310 is communicated with the second regulating chamber 592, the first regulating membrane 530 is arranged on the shell 510 in the first regulating chamber 591, one end of the first regulating membrane 530 is connected to the first pressure regulating rod 222, the second regulating membrane 540 is arranged on the shell 510 in the second regulating chamber 592, one end of the second regulating membrane 540 is connected to the second pressure regulating rod 322, one end of the first connecting pipe 550 is communicated with the first regulating chamber 591, the other end of the first connecting pipe 550 is communicated with the second steam outlet pipe 310, and the first elastic membrane 560 is arranged in the first connecting pipe 550; one end of the second connecting pipe 570 is communicated with the second regulating chamber 592, the other end of the second connecting pipe 570 is communicated with the first steam outlet pipe 210, and the second elastic membrane 580 is arranged in the second connecting pipe 570.

[0046] When the pressure in the first regulating chamber 591 changes, the first regulating membrane 530 can be deformed, thereby adjusting the displacement of the first regulating rod. When the pressure in the second regulating chamber 592 changes, the second regulating membrane 540 can be deformed, thereby adjusting the displacement of the second regulating rod, thereby adjusting the steam pressure in the first steam outlet pipe 210 and the second steam outlet pipe 310. The steam pressure in the first steam outlet pipe 210 and the second steam outlet pipe 310 will automatically adjust and balance, so that the steam outlet pressures in the first steam outlet pipe 210 and the second steam outlet pipe 310 can change synchronously, thereby improving the stability of the steam intake and reducing the pressure difference of the steam intake.

[0047] Reference Figure 2 The preheating mechanism 600 includes a preheating shell 610 , a heat preservation layer 620 and a heating plate 630 . The preheating shell 610 is disposed on the machine body 100 , the heat preservation layer 620 is disposed on the preheating shell 610 and the machine body 100 , and the heating plate 630 is disposed in the preheating shell 610 .

[0048] Before steam transmission, the machine body 100 is heated by the preheating mechanism 600 to evaporate the steam droplets remaining in the machine body 100, thereby reducing the influence of the steam droplets on the regulating mechanism 500 and improving the pressure regulation accuracy.

[0049] The implementation principle of a steam turbine steam inlet system in the embodiment of the utility model is:

[0050] When the steam turbine is bidirectionally supplied with steam, the steam enters the steam separation chamber in the body 100 through the steam transmission pipe 110, and then the steam in the first steam inlet channel 230 enters the first steam outlet pipe 210 through the first pressure regulating seat 221 and the first pressure regulating rod 222, and the steam in the second steam inlet channel 330 enters the second steam outlet pipe 310 through the second pressure regulating seat 321 and the second pressure regulating rod 322; part of the steam in the first steam outlet pipe 210 enters the regulating mechanism 500, so that the regulating mechanism 500 adjusts the pressure of the second pressure regulating rod 322. 22 is adjusted, and part of the steam in the second steam outlet pipe 310 enters the adjusting mechanism 500, so that the adjusting mechanism 500 adjusts the first pressure regulating rod 222, so that when the steam pressure at one end increases, the steam pressure at the other end can be increased at the same time through the adjusting mechanism 500. Under the influence of each other's pressures, automatic adjustment is achieved, so that the steam pressures at both ends tend to be balanced, thereby achieving the effect of stabilizing the flow of the steam input in the steam transmission pipe 110, and making the steam entering the steam turbine more stable.

[0051] The above are all preferred embodiments of the present utility model, and are not intended to limit the protection scope of the present utility model. Therefore, any equivalent changes made based on the structure, shape, and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A steam turbine steam inlet system, characterized in that: The steam turbine comprises a machine body (100), a steam delivery pipe (110), a first steam inlet mechanism (200), a second steam inlet mechanism (300) and a regulating mechanism (500); the steam delivery pipe (110) is arranged on the machine body (100); the first steam inlet mechanism (200) comprises a first steam outlet pipe (210) and a first pressure regulating assembly (220); a first steam inlet channel (230) is provided on the machine body (100); the first pressure regulating assembly (220) comprises a first pressure regulating seat (221) and a first pressure regulating rod (222); the first pressure regulating seat (221) is arranged on the machine body (100); the first pressure regulating rod (222) is slidably arranged on the machine body (100); and the first steam outlet pipe (210) is arranged on the machine body (100); The second steam inlet mechanism (300) comprises a second steam outlet pipe (310) and a second pressure regulating assembly (320); a second steam inlet channel (330) is provided on the machine body (100); the second pressure regulating assembly (320) comprises a second pressure regulating seat (321) and a second pressure regulating rod (322); the second pressure regulating seat (321) is arranged on the machine body (100); the first pressure regulating rod (222) is slidably arranged on the machine body (100); and the second steam outlet pipe (310) is arranged on the machine body (100); The regulating mechanism (500) is arranged on the machine body (100), the regulating mechanism (500) is connected to the first pressure regulating rod (222) and the second pressure regulating rod (322), and the regulating mechanism (500) is in communication with the first steam outlet pipe (210) and the second steam outlet pipe (310).

2. A steam turbine steam inlet system according to claim 1, characterized in that: The regulating mechanism (500) comprises a shell (510) and an intermediate plate (520); the shell (510) is arranged on the machine body (100); an regulating chamber (590) is provided in the shell (510); the intermediate plate (520) is arranged in the shell (510); the intermediate plate (520) divides the regulating chamber (590) into a first regulating chamber (591) and a second regulating chamber (592); one end of the first pressure regulating rod (222) is slidably arranged on the shell (510); the first pressure regulating rod (222) is in the first regulating chamber (591); the first steam outlet pipe (210) is communicated with the first regulating chamber (591); one end of the second pressure regulating rod (322) is slidably arranged on the shell (510); the second pressure regulating rod (322) is in the second regulating chamber (592); the second steam outlet pipe (310) is communicated with the second regulating chamber (592).

3. A steam turbine steam inlet system according to claim 2, characterized in that: The regulating mechanism (500) further comprises a first regulating membrane (530) and a second regulating membrane (540); the first regulating membrane (530) is arranged on a housing (510) in a first regulating chamber (591); one end of the first regulating membrane (530) is connected to a first pressure regulating rod (222); the second regulating membrane (540) is arranged on a housing (510) in a second regulating chamber (592); one end of the second regulating membrane (540) is connected to a second pressure regulating rod (322).

4. A steam turbine steam inlet system according to claim 1, characterized in that: The regulating mechanism (500) further comprises a first connecting pipe (550), a first elastic membrane (560), a second connecting pipe (570) and a second elastic membrane (580); one end of the first connecting pipe (550) is connected to the first regulating chamber (591), the other end of the first connecting pipe (550) is connected to the second steam outlet pipe (310), and the first elastic membrane (560) is arranged in the first connecting pipe (550); one end of the second connecting pipe (570) is connected to the second regulating chamber (592), the other end of the second connecting pipe (570) is connected to the first steam outlet pipe (210), and the second elastic membrane (580) is arranged in the second connecting pipe (570).

5. A steam turbine steam inlet system according to any one of claims 1 to 4, characterized in that: The first pressure regulating assembly (220) further comprises a first pressure regulating spring (223), one end of the first pressure regulating spring (223) being arranged on the first pressure regulating seat (221), and the other end of the first pressure regulating spring (223) being arranged on the first pressure regulating rod (222); The second pressure regulating assembly (320) further comprises a second pressure regulating spring (324), one end of the second pressure regulating spring (324) being arranged on the second pressure regulating seat (321), and the other end of the second pressure regulating spring (324) being arranged on the second pressure regulating rod (322).

6. A steam turbine steam inlet system according to claim 5, characterized in that: The first pressure regulating assembly (220) further comprises a first telescopic cylinder (224), wherein the first telescopic cylinder (224) is arranged on the machine body (100), and the other end of the first telescopic cylinder (224) is connected to a first pressure regulating spring (223); The second pressure regulating assembly (320) further comprises a second telescopic cylinder (323), wherein the second telescopic cylinder (323) is arranged on the machine body (100), and the other end of the second telescopic cylinder (323) is connected to a second pressure regulating spring (324).

7. A steam turbine steam inlet system according to any one of claims 1 to 4, characterized in that: The first pressure regulating seat (221), the first pressure regulating rod (222), the second pressure regulating seat (321) and the second pressure regulating rod (322) are all provided with steam holes (400).

8. A steam turbine steam inlet system according to any one of claims 1 to 4, characterized in that: The machine body (100) is provided with a preheating mechanism (600), the preheating mechanism (600) comprising a preheating shell (610), a heat-insulating layer (620) and a heating plate (630), the preheating shell (610) being provided on the machine body (100), the heat-insulating layer (620) being provided on the preheating shell (610) and the machine body (100), and the heating plate (630) being provided in the preheating shell (610).

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