Steam turbine without steam exhaust port in cylinder sleeve

Abstract

The invention discloses a steam turbine without a steam exhaust port in a cylinder sleeve. The steam turbine comprises the cylindrical cylinder sleeve, an impeller installed on a main shaft and a plurality of sets of blades. Two ends of the main shaft are respectively supported on the left end cover and the right end cover through bearings; a plurality of steam inlets are evenly formed in the outer circle of the cylinder sleeve, a condensed water discharging opening is formed under the steam inlets, and a steam blocking face and a guiding face are symmetrically formed in the connecting positions of every two adjacent sets of blades on the impeller respectively. Two sets of radial sealing strips are arranged at the contact position of the outer edge of each set of blades and the inner wall of the cylinder sleeve, and a steam blocking groove is formed between the two sets of radial sealing strips. An independent rotatable sealed space is defined by the two adjacent sets of blades and the cylinder sleeve, and the sealed space is communicated with at least one steam inlet when rotating along with the impeller. The steam turbine has a good sealing effect, the cylinder sleeve is not provided with a steam exhaust port, and the steam turbine is high in heat efficiency, novel in structure, low in price, low in noise, suitable for frequent starting and particularly suitable for being used in the fields of terrestrial heat, waste gas waste heat utilization and the like.

Description

Technical Field

[0001] The present invention relates to power machinery engineering, in particular to a steam turbine with blades having sealing strips and a cylinder liner without exhaust ports, belonging to the field of external combustion engines. Background Art

[0002] In existing steam and gas turbines, the increasing number of blades is often very thin, making it impossible to install sealing strips at the contact area with the cylinder liner, resulting in an incomplete seal. This prevents the use of the pressure potential energy of the high-pressure steam to generate power, instead utilizing only the impact kinetic energy of the high-pressure steam. High thermal efficiency is achieved only under conditions of high temperature, high pressure, high flow rate, and high speed. This makes it unsuitable for use in low-temperature, low-pressure, low-flow, and low-speed operating conditions, such as geothermal energy and waste heat recovery. Furthermore, the thin blades generate significant noise when they collide with the high-pressure steam flow to generate power.

[0003] The applicant's prior invention of a "rotary piston steam engine," patent number ZL202210885629.3, although having excellent sealing properties and capable of utilizing the pressure potential energy of high-pressure steam to perform work, has two sets of exhaust ports arranged on one circumference of its cylinder liner. The high-pressure steam injected tangentially only works within the cylinder liner for half a circumference before being discharged from the exhaust ports, thereby wasting a considerable amount of heat energy. Summary of the Invention

[0004] The present invention provides a steam turbine with blade sealing strips and a cylinder liner without exhaust ports. The sealing strips at the contact points between the blades and the cylinder liner provide a good seal, while the lack of exhaust ports in the cylinder liner prolongs the time the high-pressure steam remains in the cylinder, resulting in high thermal efficiency. This invention features a novel structure, low cost, low noise, and the ability to be started frequently, making it particularly suitable for use in geothermal applications and waste heat recovery applications.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is: A steam turbine with blades having sealing strips and a cylinder liner without exhaust ports, comprising a cylindrical cylinder liner mounted between a left end cover and a right end cover, an impeller fixedly mounted on a main shaft and located within the cylinder liner, and a plurality of blades constituting the impeller; The two ends of the main shaft are supported on the left end cover and the right end cover respectively through bearings; its structural characteristics are: Multiple steam inlets are evenly arranged on the outer circle of the cylinder liner, and the steam blocking surface and the guide surface are symmetrically formed at the connecting parts of two adjacent groups of blades on the impeller; Two groups of radial sealing strips are provided at the outer edge of each group of blades in contact with the inner wall of the cylinder liner, and a steam-blocking groove is provided between the two groups of radial sealing strips; an independent rotatable sealing space is enclosed between the two adjacent groups of blades and the cylinder liner, and the sealing space is connected with at least one steam inlet when the impeller rotates, and the extension direction of the steam inlet is facing the steam-blocking surface.

[0006] According to the embodiments of the present invention, the present invention can be further optimized. The following is the technical solution formed after optimization: In a preferred embodiment of the present invention, the blades together with the left-rotating end cover and the right-rotating end cover are fixedly mounted on the main shaft. In order to maximize the use of steam energy, the steam baffle surface is coplanar with the axis of the main shaft.

[0007] In a preferred embodiment of the present invention, the radial sealing strip is installed in a sealing strip seat, and an oil channel bottom plate is provided on the inner side of the sealing strip seat and is installed between the left rotating end cover and the right rotating end cover; an oil channel is formed between the bottom surface of the sealing strip seat and the oil channel bottom plate; In a preferred embodiment of the present invention, a passage outlet communicating with the oil passage is provided on the left rotating end cover, and a passage inlet communicating with the oil passage is provided on the right rotating end cover.

[0008] In a preferred embodiment of the present invention, an oil outlet is provided above the bearing of the left end cap, corresponding to the aisle outlet, and an oil inlet is provided below the bearing of the right end cap, corresponding to the aisle inlet. Thus, an oil inlet corresponding to the aisle inlet is drilled into the right end cap. Oil, driven by an oil pump, flows through the oil inlet and passes through the lubrication and cooling oil passages to lubricate and cool the sealing friction surfaces. An oil outlet is drilled into the left end cap, corresponding to the aisle outlet. After completing the lubrication and cooling process, the oil flows out of this outlet and into the oil tank for cooling before the next operating cycle.

[0009] In a preferred embodiment of the present invention, a small oil hole communicating with the oil passage is provided at the bottom of the steam retaining groove.

[0010] To promptly remove the water formed by condensation, the cylinder liner is provided with a condensate drain port. In addition to lubricating and cooling the friction surfaces, the present invention also provides excellent thermal insulation for other components, such as the pipes, valves, and the outer layer of the cylinder liner. However, a small amount of high-pressure steam can still condense into water within the rotating cylinder. Therefore, a drain port is provided at the lower end of the central portion of the cylinder liner. After each rotation of the rotating cylinder, the condensate generated is drained through the drain port through a steam trap.

[0011] In a preferred embodiment of the present invention, the guide surface is composed of two surfaces arranged at an obtuse angle. In a preferred embodiment of the present invention, four groups of blades are provided in the circumferential direction.

[0012] In a preferred embodiment of the present invention, a main shaft oil seal is installed between the left end cover and the step corresponding to the main shaft, and is fixedly connected to the pulley through a key pin at the protruding end of the main shaft.

[0013] In a preferred embodiment of the present invention, the sealed space is communicated with at least one steam inlet as the impeller rotates, and an extending direction of the steam inlet is perpendicular to the steam blocking surface.

[0014] The present invention is further described below.

[0015] A steam turbine with blades equipped with sealing strips and a cylinder liner without exhaust ports comprises a cylindrical cylinder liner with multiple steam inlets arranged evenly along the outer circumference of the cylinder liner, approximately along a tangent line. A condensate drain port is located vertically below the center of the cylinder liner and is connected to a steam trap. A main shaft is located in the center of the cylinder liner, with its ends rollingly connected to bearing holes in the center of the left and right end covers, respectively, via bearings.

[0016] A rubber oil seal is installed between the inner hole at the left end of the left end cover and the journal corresponding to the main shaft.

[0017] The impeller consists of four groups of thickened blades, a left-rotating end cover and a right-rotating end cover, and is fixedly connected to the main shaft.

[0018] The sliding surface of the thickened blade in contact with the inner wall of the cylinder liner is installed with a metal sealing strip, which relies on the pressure of the spring on the back to make it close to the inner wall of the steel sleeve to achieve a good sealing effect. If low-temperature steam below 200°C such as geothermal heat and waste heat from exhaust gas is used, the present invention adopts a rubber sealing strip, and drills a small steam hole at the bottom of the sealing groove that is connected to the rotating cylinder. The pressure of the high-pressure steam is used to make the rubber sealing strip close to the inner wall of the cylinder liner to achieve a good sealing effect. This can reduce the wear of the inner wall of the cylinder liner, reduce the cost, and extend the service life of the cylinder liner. A lubricating and cooling steam-blocking groove is processed between the two sealing strips, and a small hole that is connected to the lubricating and cooling oil channel is drilled at the bottom of the groove. In order to reduce weight, the thickened blades are processed into a hollow shape, and corresponding reinforcing ribs are provided inside them to ensure the strength of the thickened blades.

[0019] The outer circumferences of the left-hand and right-hand rotating end caps are machined with sealing ring grooves. Two metal sealing rings are installed in the sealing ring grooves and are fixedly connected to the inner wall of the cylinder liner by their elastic force. Their side surfaces are slidably connected to the side surfaces of the ring grooves. High-pressure steam flowing through the steam vents forces them to adhere tightly, achieving an effective seal. Oil flowing through the lubricating oil holes lubricates and cools the friction surfaces. If operating with low-temperature steam below 200°C, the present invention uses Y-shaped rubber sealing rings. High-pressure steam flowing through the steam vents forces the sealing surfaces to adhere tightly, achieving an effective seal. Oil flowing through the oil holes also lubricates and cools the friction surfaces.

[0020] The impeller is also provided with a guide surface and a steam-blocking surface. The extension line of the steam-blocking surface passes through the center of the main shaft. When colliding with the high-pressure steam flow coming from a direction close to the tangent, it can obtain maximum impact kinetic energy. The guide surface is processed to be parallel to the direction of the high-pressure steam flow as much as possible, which can reduce the resistance of the steam flow. The guide surface and the steam-blocking surface, together with the corresponding arc segments of the cylinder liner and the corresponding parts of the left-rotating end cover and the right-rotating segment cover, form a sealed space that can rotate around the center of the main shaft. For the convenience of description, the present invention defines this sealed space as a rotating cylinder.

[0021] When high-pressure steam is injected from the steam inlet in a near-tangential direction and collides with the steam baffle in the rotating cylinder, its kinetic energy propels the rotating cylinder in a clockwise direction. At this point, the impeller, comprised of four rotating cylinders, rotates synchronously in a clockwise direction to produce external work. The high-pressure steam that has completed its work is not discharged but instead accumulates in the rotating cylinders. Multiple sets of steam inlets are evenly spaced along the entire outer circumference of the cylinder liner. Regardless of the rotating cylinder's rotational position, at least one inlet is connected to the rotating cylinder. This ensures that the steam pressure in the rotating cylinders always approaches that of the steam inlets. The steam energy accumulated in the rotating cylinders transfers the full energy of the high-pressure steam flow from the steam inlets to the steam baffles further away from the inlets, driving the impeller in a clockwise rotation to produce external work. During this process, the high-pressure steam flow remains in the same direction as the impeller, eliminating the need for blade cascades to redirect it, thereby improving thermal efficiency. This invention eliminates the need for blade cascades, reduces the number of blades, improves blade strength, extends blade life, and reduces noise – achieving multiple goals at once.

[0022] It should also be noted that as the inner diameter of the cylinder liner increases, the number of rotating cylinders will also increase accordingly and is not limited to four groups.

[0023] Compared with the prior art, the present invention has the following beneficial effects: 1. Compared with ZL2022108856293, the cylinder liner of the present invention is not provided with a steam exhaust port, and the time for high-pressure steam to work in the rotating cylinder is greatly extended. Only after part of the high-pressure steam condenses into water is it discharged from the drain port through the steam trap, which greatly improves the thermal energy utilization rate.

[0024] 2. The impeller of the present invention is an integral impeller composed of multiple groups of thickened blades fixedly connected. There is no differential motion between the blades and no need to install a one-way bearing, which simplifies the structure, reduces costs and extends the service life.

[0025] 3. Compared with existing steam turbines, the thickened blades of the present invention have high strength and will not make loud noise when colliding with high-pressure steam to produce work. The thickened blades are in surface contact with the inner wall of the cylinder liner, and multiple sealing rings and sealing strips can be installed to form a continuous sealing line with good sealing effect, thereby eliminating the need for blade cascades, reducing the number of blades, lowering the cost, and improving thermal efficiency.

[0026] 4. The present invention does not require warm-up cranking when starting, and is suitable for processing into a small and micro power. When the steam temperature is only more than 100°C, the present invention also has a high heat conversion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a structural diagram (longitudinal sectional view) of an embodiment of the present invention; Figure 2 is a longitudinal view of a cylinder liner according to an embodiment of the present invention; Figure 3 yes Figure 1 AA section view; Figure 4 yes Figure 2 BB cross-sectional view; Figure 5 It is a schematic diagram of the working principle of an embodiment of the present invention.

[0028] Description of the accompanying drawings: 1-pulley, 2-key pin, 3-spindle, 4-spindle oil seal, 5-spindle bearing, 6-end cover bolt, 7-oil outlet, 8-left end sealing ring, 9-left sealing ring seat, 10-aisle outlet, 11-cylinder liner flange, 12-left rotating end cover, 13-steam inlet, 14-oil channel bottom plate, 15-oil small hole, 16-oil aisle, 17-impeller, 18-sealing strip seat, 19-aisle inlet, 20 right end sealing ring, 21-right end cover, 22-oil inlet, 23-right sealing ring seat, 24-cylinder liner seat, 25-right rotating end cover, 26-cylinder liner, 27-condensate discharge port, 28-radial sealing strip, 29-left end cover, 30-steam retaining groove, 31-steam retaining surface, 32-guide surface, 33-rotating cylinder. DETAILED DESCRIPTION

[0029] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. It should be noted that the embodiments and features of the embodiments may be combined unless they conflict. For ease of description, the words "upper," "lower," "left," and "right" appear below merely to indicate the directions of upper, lower, left, and right in the accompanying drawings and do not limit the structure.

[0030] The steam turbine structure of this embodiment with blades having sealing strips and a cylinder liner without exhaust ports is as follows: inside the cylindrical cylinder liner, there is an impeller consisting of four groups of thickened blades, which rotates clockwise under the impact kinetic energy and pressure potential energy of high-pressure steam and outputs power to the outside through a pulley.

[0031] See also Figure 1 and Figure 3 , their specific connection relationship is: inside the cylindrical cylinder liner 26, there is an impeller 17 composed of 4 thickened blades and a left-rotating end cover 12 and a right-rotating end cover 25, and it is fixedly connected to the main shaft 3 as a whole. In order to reduce weight, each set of blades is processed into a hollow shape, and reinforcing ribs are symmetrically arranged inside it to increase its strength. A radial sealing strip 28 is provided at the part where the outer edge of the blade contacts the inner wall of the cylinder liner 26, and is installed in the groove corresponding to the sealing strip seat 18. The pressure of the spring behind it makes the radial sealing strip 28 close to the inner wall of the cylinder liner 26 to achieve a good sealing effect. The lubricating and cooling oil channel 16 is formed between the bottom surface of the sealing strip seat 18 and the oil channel bottom plate 14. A lubricating and cooling steam retaining groove 30 is provided between the two sealing grooves. A small oil hole 15 is drilled at the bottom thereof to communicate with the lubricating and cooling oil channel 16 so that the oil can flow in and lubricate and cool its friction surface.

[0032] A plurality of steam inlets 13 are evenly arranged on the outer circumference of the cylinder liner 26, see Figure 2 The two adjacent groups of thickened blades on the impeller 17 are symmetrically connected to form a steam blocking surface 31 and a guide surface 32. A condensate discharge port 27 is provided just below the middle of the cylinder sleeve 26 and is connected to the steam trap.

[0033] In some preferred embodiments, the guide surface 32 is composed of two surfaces arranged at an obtuse angle.

[0034] The outer circle of the left rotating end cover 12 is provided with a left sealing ring seat 9, and the left end sealing ring 8 is installed in this annular groove. The outer circle of the right rotating end cover 25 is provided with a right sealing ring seat 23, and the right end sealing ring 20 is installed in this annular groove.

[0035] The left and right end caps 29 and 21 are each securely connected to the cylinder liner 26 via end cap bolts 6. Their center holes are in rolling contact with the main shaft 3 via spindle bearings 5. A spindle oil seal 4 is installed between the left end center hole of the left end cap 29 and the corresponding step on the main shaft 3. At the leftmost end of the main shaft 3, a key pin 2 secures it to the pulley 1.

[0036] An oil inlet 22 is provided at a position corresponding to the aisle inlet 19 below the bearing of the right end cover 21. An oil outlet 7 is provided at a position corresponding to the aisle outlet 10 above the bearing of the left end cover 29.

[0037] The following is an analysis of how the present invention utilizes the impact kinetic energy and pressure potential energy of high-pressure steam to perform work.

[0038] See also Figure 3 When the outer edge of the thickened blade turns to the position of the steam inlet 13, the huge impact force of the high-pressure steam sprayed from the steam inlet 13 pushes the thickened blade to drive the rotating cylinder 33 to rotate in the clockwise direction under the dual action of the boundary layer viscosity and the resistance of the steam blocking groove 30. When the steam blocking surface 31 just turns to the position of the steam inlet 13, the strong steam flow pushes the steam blocking surface 31 to rotate in the clockwise direction. After the steam blocking surface 31 turns away from the steam inlet 13, since the steam pressure in the rotating cylinder 33 is close to the steam pressure of the steam inlet 13, the steam flow of the steam source can no longer flow forward after being sprayed into the rotating cylinder 33 from the steam inlet 13. Its impact pressure can only be transmitted to the steam blocking surface 31 through the high-pressure steam gathered in the rotating cylinder 33, so that it continues to push the rotating cylinder 33 to rotate in the clockwise direction. At this time, the arc segment corresponding to the steam blocking surface to the guide surface, that is, Figure 5 In the arc segment from point E to point D, the torque exerted by the high-pressure steam injected from the steam inlet 13, which pushes the steam baffle 31 in a clockwise rotation, remains constant. The high-pressure steam flow remains in the same direction, eliminating the need for cascade blades to redirect it. In existing steam turbines, the blades are not completely sealed against the cylinder liner. If only four sets of blades are arranged around a single circumference, the high-pressure steam's impact kinetic energy received by the blades becomes significantly reduced as they rotate farther from the steam inlet.

[0039] When the outer edges of the next set of thickened blades rotate to the steam inlet 13, the present invention repeats the previous working cycle. The powerful steam flow continues to push the thickened blades, driving the rotating cylinder 33 in a clockwise rotation, thereby performing external work. Thus, the present invention utilizes both the impact kinetic energy and the pressure potential energy of the high-pressure steam flow to propel the steam baffle 31 clockwise to perform work. Simultaneously, the steam flow direction remains unchanged, eliminating the need for cascade guides to readjust the flow direction. This saves a significant amount of heat energy and significantly reduces manufacturing costs.

[0040] In this embodiment, four groups of thickened blades are evenly distributed within the cylinder liner 26, and the sealing strips and sealing rings at the joint surface are connected end to end, forming a complete sealing line. This creates an independent, rotatable sealed space between the two groups of thickened blades. Regardless of the position of the rotating cylinder 33 in the cylinder liner 26, at least one steam inlet 13 is connected to the rotating cylinder 33, ensuring that its pressure is always close to the steam pressure of the steam inlet 13. The extension direction of the steam inlet 13 is nearly perpendicular to the steam baffle 31. The high-pressure steam pressure injected from the steam inlet is directly transmitted to the steam baffle 31 through the compressed steam accumulated in the rotating cylinder 33. This ensures that the rotating cylinder 33 can always generate a large torque, driving the impeller 17 to rotate clockwise to perform external work. In existing steam engines, if the direction of the high-pressure steam flow is perpendicular to the force-bearing surface of the blade, it is easy to cause vibration and fatigue damage to the blade, and is not conducive to the smooth flow of steam in the blade channel. The thickened blades of the present invention are highly robust and less susceptible to vibration and damage. Furthermore, after the high-pressure steam collides with the thickened blades and generates work, it is completely collected within the rotating cylinder 33, eliminating the need to flow through the blade passages. Therefore, the steam flow direction of the present invention is perpendicular to the blade's force-bearing surface, allowing the impeller 17 to maximize energy.

[0041] The present invention does not have a steam exhaust port, because only when the internal combustion engine burns inside the cylinder will exhaust gas be generated and need to be discharged. The present invention is that there is no exhaust gas in the cylinder of the external combustion engine that needs to be discharged, unless a small amount of steam condenses into water after cooling, which can be discharged through the drain valve, so that no steam is discharged but only water is discharged. The high-pressure steam injected from the steam inlet 13 along the tangential direction of the present invention is all gathered in the rotating cylinder 33 after pushing the rotating cylinder 33 to rotate clockwise to do work, and always maintains an effectively high steam pressure to ensure that the steam baffle surface 31 can obtain the maximum thrust when it is turned away from the steam inlet 13. This allows the rotating cylinder 33 to rotate quickly in the clockwise direction to do external work until a small amount of steam condenses into water, and then it is discharged from the drain port 27 through the drain valve, thereby maximizing the use of steam heat energy. The outer layer of the cylinder liner 26 of the present invention is provided with a good heat preservation device, and the rotating cylinder 33 has a good sealing effect, and the steam heat accumulated inside it is not easy to dissipate. In existing steam turbines, sealing strips cannot be installed between the blades and the cylinder to achieve complete sealing. The high-pressure steam injected along the tangential direction is immediately discharged after pushing the impeller to complete its work. The exhaust steam temperature is as high as over 100 degrees. This shows that the thermal energy utilization rate of the present invention is much higher than that of existing steam turbines.

[0042] The present invention utilizes the impact kinetic energy and pressure potential energy of high-pressure steam to do work, while the steam flow direction is never changed and there is no need to install blade grids for redirection.

[0043] In summary, compared with existing steam turbines, the present invention maximizes the use of the thermal energy of high-pressure steam and opens up a new research field in the thermal engine manufacturing industry.

[0044] The contents described in the above embodiments should be understood as these embodiments are only used to more clearly illustrate the present invention, and are not used to limit the scope of the present invention. After reading the present invention, various equivalent modifications to the embodiments made by those skilled in the art fall within the scope defined by the claims attached to the present invention.

Claims

1. A steam turbine having a cylinder liner without a steam exhaust port, comprising a cylindrical cylinder liner (26) mounted between a left end cover (29) and a right end cover (21), an impeller (17) fixedly mounted on a main shaft (3) and located within the cylinder liner (26), and a plurality of blades constituting the impeller (17); The two ends of the main shaft (3) are supported on the left end cover (29) and the right end cover (21) respectively through bearings; it is characterized in that: A plurality of steam inlets (13) are evenly arranged on the outer circumference of the cylinder liner (26), and a steam blocking surface (31) and a guide surface (32) are formed at the interconnected portions of two adjacent groups of blades on the impeller (17); Two groups of radial sealing strips (28) are provided at the contact points between the outer edges of each group of blades and the inner wall of the cylinder liner (26), and a steam retaining groove (30) is provided between the two groups of radial sealing strips (28); an independent rotatable sealing space is enclosed between two adjacent groups of blades and the cylinder liner (26), and the sealing space is connected to at least one steam inlet (13) when the impeller (17) rotates, and the extension direction of the steam inlet (13) is directly opposite to the steam retaining surface (31).

2. The steam turbine with a cylinder liner without exhaust ports according to claim 1, characterized in that: The blades are fixedly mounted on the main shaft (3) via a left-rotating end cover (12) and a right-rotating end cover (25); the steam-blocking surface (31) is coplanar with the axis of the main shaft (3).

3. The steam turbine with a cylinder liner without exhaust ports according to claim 2, characterized in that: The radial sealing strip (28) is installed in the sealing strip seat (18), and an oil channel bottom plate (14) is provided inside the sealing strip seat (18) and is installed between the left rotating end cover (12) and the right rotating end cover (25); an oil channel (16) is formed between the bottom surface of the sealing strip seat (18) and the oil channel bottom plate (14); A passageway outlet (10) communicating with the engine oil passageway (16) is provided on the left rotating end cover (12), and a passageway inlet (19) communicating with the engine oil passageway (16) is provided on the right rotating end cover (25).

4. The steam turbine with a cylinder liner without exhaust ports according to claim 3, characterized in that: An oil outlet (7) is provided above the bearing of the left end cover (29) corresponding to the aisle outlet (10), and an oil inlet (22) is provided below the bearing of the right end cover (21) corresponding to the aisle inlet (19).

5. The steam turbine with a cylinder liner without a steam exhaust port according to claim 3, characterized in that: The bottom of the steam retaining groove (30) is provided with an oil hole (15) that is in communication with the oil passage (16).

6. The steam turbine with a cylinder liner without a steam exhaust port according to any one of claims 1 to 5, characterized in that: The cylinder liner (26) is provided with a condensate discharge port (27).

7. The steam turbine with a cylinder liner without a steam exhaust port according to any one of claims 1 to 5, characterized in that: The guide surface (32) is composed of two surfaces arranged at an obtuse angle.

8. The steam turbine with a cylinder liner without a steam exhaust port according to any one of claims 1 to 5, characterized in that: The blades are provided in four groups in the circumferential direction.

9. The steam turbine with a cylinder liner without a steam exhaust port according to any one of claims 1 to 5, characterized in that: A spindle oil seal (4) is installed between the left end cover (29) and the step corresponding to the spindle (3), and is fixedly connected to the pulley (1) via a key pin (2) at the protruding end of the spindle (3).

10. The steam turbine with a cylinder liner without a steam exhaust port according to any one of claims 1 to 5, characterized in that: The sealed space is communicated with at least one steam inlet (13) when the impeller (17) rotates, and the extension direction of the steam inlet (13) is perpendicular to the steam blocking surface (31).

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