Steam trap capable of automatically adjusting drainage amount according to drainage flow and control method

Abstract

The invention relates to the technical field of drainage discharge of thermal power plants, and particularly discloses a steam trap capable of automatically adjusting the drainage amount according to the drainage flow and a control method. The steam trap comprises a steam trap shell, a drainage inlet in the steam trap shell, a drainage outlet in the steam trap shell and an adjusting device. The adjusting device is placed in the steam trap shell, the steam trap shell is provided with a space capable of being sealed, and the adjusting device can automatically adjust the drainage amount according to the drainage flow. The control method comprises a water injection step and a hydrophobic step, and further comprises a hydrophobic aperture determination step. The steam trap solves the technical problems that a steam trap cannot continuously drain water, impurities are easy to accumulate at the bottom, and drain water discharge is blocked, and is suitable for the steam trap capable of automatically adjusting the drain water discharge amount after condensation of a steam-gas mixture.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drainage discharge of thermal power plants, and relates to a drain trap and a control method for automatically adjusting the amount of drain according to the drain flow, which are suitable for automatically adjusting the discharge amount of drain after condensation of a steam-gas mixture. BACKGROUND

[0002] At present, there is an important continuous drain discharge in the drain system of thermal power plants. The drain comes from the drain discharge after condensation of a steam-gas mixture (such as steam seal heater and steam jet air ejector), and the purpose of condensation is to reduce the steam content in the steam-gas mixture and reduce the volume flow of the steam-gas mixture. Although the amount of drain is not large, the air content in the steam-gas mixture is not lower than the condenser air extraction amount. If the air enters the condenser with the drain, it will seriously affect the back pressure and vacuum of the unit and reduce the power generation of the unit. Therefore, this kind of continuous drain needs to use a special drain device that only allows water to pass through and does not allow gas to pass through the drain device. Two kinds of drain devices commonly used in engineering are U-shaped water seal pipe drain and floating ball type drain trap.

[0003] The U-shaped water seal pipe drain is connected to the condenser through the U-shaped water seal pipe. The drain can pass through the U-shaped water seal pipe, but the gas cannot pass through the U-shaped water seal pipe. However, the U-shaped water seal pipe has a large height requirement (it must maintain a sufficient water seal height during operation), and the space layout is difficult. A U-shaped water seal pipe with a height of about 10 m is required for 0.1 MPa drain. For shaft exhaust, side exhaust units or mobile power platforms, it is difficult to provide such a large height space. In addition, the U-shaped water seal pipe is prone to accumulate impurities at the bottom of the U-shaped pipe, which blocks the drain discharge, and it is difficult to discharge the impurities.

[0004] The floating ball type drain trap first enters the floating ball type drain trap. When the drain submerges the floating ball to a certain height, the buoyancy of the floating ball is greater than the sum of the gravity and the adsorption force component of the drain port. After that, the floating ball starts to rise, the drain port below the floating ball opens, and the stored water in the drain trap flows to the condenser. When the stored water in the drain trap is lower than a certain height, the buoyancy is less than the gravity, the floating ball descends, and the drain port below the floating ball closes. The floating ball type drain trap is difficult to achieve continuous drain, and is usually intermittent, i.e. the process of closing-opening-closing-opening again. In order to ensure sufficient buoyancy, the wall of the floating ball is usually very thin. In addition, the floating ball constantly rises, descends and rotates, and rubs against the inner wall of the drain trap. The floating ball thins very quickly, and the service life of the floating ball type drain trap is not long, which needs to be checked and replaced frequently.

[0005] In the prior art, CN203810022U discloses a support rod type trap with adjustable condensate discharge amount, CN221004686U discloses a trap capable of adjusting the amount of water discharge, CN218455159U discloses a disassembly-free cleanable trap, CN203202576U discloses a mechanical water seal type steam trap, and CN102213358A discloses a floating ball automatic adjustment proportional type steam trap, all of which are related to the structure of the trap, but no relevant document is reported. SUMMARY

[0006] The technical purpose of the present application is to overcome the deficiencies of the prior art, to solve the technical problems that the trap cannot continuously drain water, and that impurities are easily accumulated at the bottom of the trap to block the water discharge, and to provide a trap and a control method for automatically adjusting the amount of water discharge according to the water flow.

[0007] The technical purpose of the present application is achieved by the following technical solution: a trap for automatically adjusting the amount of water discharge according to the water flow, the trap comprising a trap housing, a water inlet on the trap housing, a water outlet on the trap housing, and an adjusting device. The adjusting device is placed in the trap housing, the trap housing has a sealable space, and the adjusting device can automatically adjust the amount of water discharge according to the water flow.

[0008] Further, the trap housing is in the shape of a cylinder or a cylinder-like shape, and the cylinder is either a one-piece structure or a combined structure.

[0009] Further, in order to smoothly discharge air and remove impurities, the cylinder is further provided with an air release port and a pollution discharge port.

[0010] In order to facilitate manufacturing, installation and smooth water drainage, another technical solution is disclosed in the embodiments of the present application: a trap for automatically adjusting the amount of water discharge according to the water flow, the trap housing being a cylinder and being a combined structure, the combined structure comprising an upper flange, an upper flange cover, a lower cover plate and a spring fixing device, and the spring fixing device can be a spring fixing stud. The adjusting device comprises a spring fixing stud, a tension spring, a shockproof cover, a float, a guide limiting block, a movable water drainage hole, a fixed water drainage hole and a movable guide column, wherein the movable water drainage hole and the fixed water drainage hole form a variable diameter water drainage hole, the tension spring is fixed on the spring fixing stud and connected to the float. The spring tension is mainly used for balancing the gravity, and the buoyancy is mainly used for overcoming the friction; the moving guide column and the limiting device are arranged at the bottom of the float, so that the float can only move up and down and cannot rotate, and the displacement interval is limited; the moving drain hole is opened on the moving guide column, and the moving drain hole moves up and down with the float; the fixed drain hole is arranged on the drain cylinder, and the fixed drain hole is close to the notch plane of the moving guide column.

[0011] Further, the embodiment of the present application further discloses another technical scheme of the drain trap which automatically adjusts the drain amount according to the drain flow, and the technical scheme sets an initial position, that is, the initial position is that the moving drain hole is below, the fixed drain hole is above, no overlap is generated, and a certain safety distance is left.

[0012] The embodiment of the present application further discloses a variable-aperture drain trap, and the technical scheme adopts the cylindrical float, and the force on the float is the gravity, the buoyancy, the friction and the spring tension; the spring tension is mainly used for balancing the gravity, and the buoyancy is mainly used for overcoming the friction; the moving guide column and the limiting device are arranged at the bottom of the float, so that the float can only move up and down and cannot rotate, and the displacement interval is limited; the moving drain hole is opened on the moving guide column, and the moving drain hole moves up and down with the float; the fixed drain hole is arranged on the drain cylinder, and the fixed drain hole is close to the notch plane of the moving guide column, the sealing effect is achieved by the adsorption force of the drain hole, the initial position is that the moving drain hole is below, the fixed drain hole is above, no overlap is generated, and a certain safety distance is left.

[0013] Meanwhile, another technical scheme of the present application further limits the float and the variable-aperture drain hole, that is, the drain trap, the float is the cylindrical float, and the instant distance of the variable-aperture drain hole and the water storage height in the drain trap are in a linear relationship, wherein the instant distance can be represented by height, length, width or diameter. The variable-diameter drain hole has a linear relationship with the water height in the drain, and the drain flow is determined by the variable-diameter drain hole, the variable-diameter drain hole increases with the increase of the drain flow, the variable-diameter drain hole decreases with the decrease of the drain flow, and the variable-diameter drain hole is zero when the drain flow is zero, and the water in the drain does not decrease after the water level reaches the water injection level, so that only the drain can pass through the drain during operation, and air cannot pass through the drain. With the drain entering the drain, the water in the drain gradually submerges part of the float, the buoyancy of the float is sufficient to overcome the friction, the float starts to move upwards, and when the water reaches a certain height, the moving drain hole and the fixed drain hole are externally tangent, and the water level at this time is defined as the water injection level. The water injection level can submerge the moving drain hole and the fixed drain hole underwater at a certain height; with the continuous rise of the water, the float rises again, the moving drain hole and the fixed drain hole have a partially overlapping area, and the water in the drain can flow into the condenser under the action of the pressure difference, the overlapping area in the present application is referred to as the variable-diameter drain hole, the variable-diameter drain hole has a linear relationship with the water height in the drain, and the drain flow is determined by the variable-diameter drain hole, the variable-diameter drain hole increases with the increase of the drain flow, the variable-diameter drain hole decreases with the decrease of the drain flow, and the variable-diameter drain hole is zero when the drain flow is zero, and the water in the drain does not decrease after the water level reaches the water injection level, so that only the drain can pass through the drain during operation, and air cannot pass through the drain.

[0014] The technical scheme of the present application further discloses a tensile spring: the drain according to the present application can automatically adjust the drain amount according to the drain flow, the wire diameter, the medium diameter and the number of turns of the tensile spring are determined by the weight of the float and the displacement amplitude of the float, the spring tension is equal to the gravity of the float in the waterless state, the float rises in the water storage state, the elongation of the spring decreases, and a part of the gravity of the float is shared by the buoyancy; the displacement amplitude of the float is determined by the drain pressure difference and the drain flow, and the optimal value is 2 times the diameter of the fixed drain hole + a certain displacement blind area; The cylindrical float is made of stainless steel material, a certain length of cylinder is closed by two hollow hemispheres, the float has a certain wall thickness, and the maximum submergence height of the float is optimally 3 / 4 of the total height of the float, at this time the buoyancy should ensure that the float rises to the upper limit position, at this time the moving drain hole and the fixed drain hole are completely overlapped, that is, the diameter of the variable-diameter drain hole reaches the maximum value.

[0015] Further, the present application further discloses another technical scheme: the material of the tensile spring is stainless steel wire, the wire diameter, the medium diameter and the number of turns of the tensile spring are determined by the weight of the float and the displacement amplitude of the float, the maximum allowable tension of the spring should be greater than the gravity of the float, the k value of the spring is 80% of the designed buoyancy divided by the displacement amplitude of the float, and 20% of the designed buoyancy is used to overcome the friction; The moving guide column is rigidly connected to the bottom of the float, wherein two notches and a moving hydrophobic hole are processed in the middle part, and the lower end of the moving guide column is inserted into the guide limiting block in the bottom of the hydrophobic device; The guide limiting block is fixed on the lower cover plate of the hydrophobic device, so that the float can only move up and down and cannot rotate, and the up limit is defined. The fixed hydrophobic hole rotating element is installed in the hydrophobic outlet pipe and is close to the notch part of the moving hydrophobic hole guide column, and the fixed hydrophobic hole rotating element is also used to define the down limit of the float, the fixed hydrophobic hole is communicated with the hydrophobic outlet, and the hydrophobic water can be introduced into the condenser when the diameter of the variable-diameter hydrophobic hole is not zero.

[0016] The embodiment of the application further discloses another technical scheme: a control method for automatically adjusting the amount of hydrophobic water according to the hydrophobic flow, comprising the following steps, The water injection step: there is no water storage in the hydrophobic device, the hydrophobic water enters the hydrophobic device, the water storage in the hydrophobic device slowly rises, the float slowly rises accordingly, but there is no overlapping area between the moving hydrophobic hole and the fixed hydrophobic hole, the hydrophobic water cannot flow out of the hydrophobic device, and the water storage height when the two hydrophobic holes are externally tangent is defined as the water injection water level, which can ensure that the gas cannot pass through the hydrophobic device; The hydrophobic step: as the hydrophobic water continues to enter the hydrophobic device, the water storage level in the hydrophobic device exceeds the water injection water level, and an overlapping area is generated between the moving hydrophobic hole and the fixed hydrophobic hole, which is defined as a variable-diameter hydrophobic hole. The diameter of the variable-diameter hydrophobic hole depends on the water storage height in the cylinder, and the water storage height depends on the hydrophobic flow entering the hydrophobic device, so the diameter of the variable-diameter hydrophobic hole is ultimately determined by the hydrophobic flow, so as to maintain the balance of the hydrophobic flow flowing into and out of the hydrophobic device and maintain a connected hydrophobic state.

[0017] Further, the control method for automatically adjusting the amount of hydrophobic water according to the hydrophobic flow comprises a hydrophobic hole diameter determination step, in which the diameters of the moving hydrophobic hole and the fixed hydrophobic hole are considered to be the same, the diameters of the two hydrophobic holes need to consider the maximum hydrophobic amount, the pressure difference before and after, and the flow coefficient of the hydrophobic hole, and a certain safety margin is left.

[0018] The beneficial technical effects of the application are: 1. The application is suitable for hydrophobic water after condensation of a gas-liquid mixture, and ensures that only hydrophobic water can pass through the hydrophobic device, and air cannot pass through the hydrophobic device, that is, water can pass through the hydrophobic device, but air cannot pass through the hydrophobic device; 2. The application uses a tension spring, and the spring tension is used to balance the gravity of the float, and the buoyancy of the float is not used to balance the gravity, so that the wall thickness of the float does not need to be too thin; 3. The application uses a cylindrical float, and the buoyancy of the float is mainly used to overcome the friction, and the buoyancy of the float is in a substantially linear relationship with the water storage height in the hydrophobic device, and the water storage height in the hydrophobic device is determined by the hydrophobic flow; 4. The invention designs a mobile hole guide column, which is rigidly connected with the bottom of the float and will move up and down with the float, and the mobile hydrophobic hole will overlap with the fixed hydrophobic hole during the displacement process, and the hydrophobic water can be introduced into the condenser through the overlapping area; 5. The invention defines the overlapping area of the mobile hydrophobic hole and the fixed hydrophobic hole as a variable-diameter hydrophobic hole, the diameter of the variable-diameter hydrophobic hole is determined by the water storage height in the hydrophobic device, and the water storage height is determined by the hydrophobic flow, so the diameter of the variable-diameter hydrophobic hole is ultimately determined by the hydrophobic flow, the larger the hydrophobic flow, the larger the diameter of the variable-diameter hydrophobic hole, and the more the flow through the hydrophobic hole, so as to maintain the balance of the inflow and outflow of the hydrophobic device, and keep a kind of connected automatic adjustment state; 6. In the invention, the mobile hydrophobic hole and the fixed hydrophobic hole are provided with a certain displacement blind area in the initial position, that is, the float starts to drain after moving up a distance, and the water storage in the hydrophobic device is maintained above the water injection level during operation, and the water injection level line has submerged the two hydrophobic holes underwater, so as to ensure that the water does not pass the air at any time; 7. The guide limiting block in the invention is fixed at the bottom of the hydrophobic device, which limits the float to move up and down only, cannot rotate, and limits the displacement range of the float. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the structural schematic diagram of the first state of the invention.

[0020] Figure 2 It is the structural schematic diagram of the second state of the invention.

[0021] The code in the figure means: 1-hydrophobic device cylinder; 2-hydrophobic inlet; 3-upper flange; 4-upper flange cover; 5-gas outlet; 6-spring fixing stud; 7-stretching spring; 8-anti-collision cover; 9-cylindrical float; 10-hydrophobic outlet; 11-lower cover plate; 12-dump port; 13-guide limiting block; 14-mobile hydrophobic hole; 15-fixed hydrophobic hole; 16-mobile guide column; 17-variable-diameter hydrophobic hole. DETAILED DESCRIPTION

[0022] The invention relates to the hydrophobic discharge technology field of thermal power plants, in particular to a hydrophobic device capable of automatically adjusting the hydrophobic amount according to the hydrophobic flow, and a control method thereof, and the technical scheme content of the invention will be clearly and detailedly explained below in combination with the drawings of the specification.

[0023] Referring to Figure 1 and Figure 2 , the invention discloses a hydrophobic device capable of automatically adjusting the water discharge according to the water discharge, which comprises a hydrophobic device shell 1, a hydrophobic inlet 2 on the hydrophobic device shell 1, a hydrophobic outlet 10 on the hydrophobic device shell 1, and an adjusting device.

[0024] Specifically, the adjusting device is placed in the drain trap housing 1, the drain trap housing 1 has a space that can be closed, and the adjusting device can automatically adjust the drain flow. The drain trap housing 1 is a cylinder, and is a combined structure including an upper flange 3, an upper flange cover 4, a lower cover plate 11, and a spring fixing device, which can be a spring fixing stud 6. The adjusting device includes the spring fixing stud 6, a tension spring 7, a shockproof cover 8, a cylindrical float 9, a guide limiting block 13, a movable drain hole 14, a fixed drain hole 15, and a movable guide column 16. The movable drain hole 14 and the fixed drain hole 15 form a variable-diameter drain hole 17. The tension spring 7 is fixed on the spring fixing stud 6 and connected to the cylindrical float 9.

[0025] The tension of the tension spring 7 is mainly used to balance the gravity, and the cylindrical float 9 is mainly used to overcome the friction. The bottom of the cylindrical float 9 is provided with the movable guide column 16 and a limiting device, so that the float can only move up and down and cannot rotate, and the displacement interval is limited. The movable guide column 16 is provided with the movable drain hole 14, which moves up and down with the float. The drain trap cylinder 1 is provided with the fixed drain hole 15, which is in close contact with the notch plane of the movable guide column 16. The technical scheme sets an initial position, that is, the initial position of the movable drain hole 14 is below, the fixed drain hole 15 is above, no overlap is generated, and a certain safety distance is left.

[0026] The drain water is from the condensate of the gas-steam mixture. The drain pipe connected to the drain trap is usually in a semi-full state, allowing the gas in the drain trap to flow back to the condenser in reverse.

[0027] The cylindrical float 9 is made of stainless steel and is formed by a certain length of cylinder and two hollow hemispheres. The wall thickness of the float does not need to be too thin. The maximum immersion height of the float is recommended to be 3 / 4 of the total height of the float. At this time, the buoyancy should ensure that the float rises to the upper limit position. At this time, the movable drain hole 14 and the fixed drain hole 15 are completely overlapped, that is, the diameter of the variable-diameter drain hole 17 reaches the maximum value.

[0028] The material of the tension spring 7 is stainless steel wire. The wire diameter, the middle diameter, and the number of turns are determined by the gravity of the float and the displacement amplitude of the float. The maximum allowable tension of the tension spring 7 should be greater than the gravity of the float. The k value of the spring is 80% of the designed buoyancy divided by the displacement amplitude of the float, and 20% of the designed buoyancy is used to overcome the friction.

[0029] The movable guide column 16 is rigidly connected to the bottom of the float, and two notches and a movable drain hole 14 are formed in the middle part of the movable guide column 16. The lower end of the movable guide column 16 is inserted into the guide limiting block 13 at the bottom of the drain trap.

[0030] The guiding and limiting block 13 is fixed on the lower cover plate 11 of the trap, so that the float can only move up and down and cannot rotate, and the up limit is defined.

[0031] The fixed drain hole 15 is installed in the drain outlet pipe and is close to the notch part of the guiding column of the movable drain hole 14, and the fixed drain hole is also used to define the down limit of the float, and the fixed drain hole is communicated with the drain outlet, so that the drain can be guided into the condenser when the diameter of the variable diameter drain hole is not zero.

[0032] The variable diameter drain hole refers to the overlapping area of the movable drain hole and the fixed drain hole, and is the only channel for the drain to flow out of the trap, and the diameter of the variable diameter drain hole depends on the water storage height in the trap, and the water storage height in the trap depends on the drain flow, so the diameter of the variable diameter drain hole is ultimately determined by the drain flow.

[0033] The movable drain hole and the fixed drain hole have an overlapping blind area at the initial installation position, that is, the center distance is greater than the hole diameter, and only when the water storage is higher than the water injection level, the drain can be guided into the condenser from the trap, and during operation, the water storage in the trap is always higher than the water injection level, so that the two drains are submerged in water, so that water can pass through but gas cannot.

[0034] The working process of the present application is as follows: 1) Water injection stage, there is no water storage in the trap, the drain enters the trap, the water storage in the trap slowly rises, the float slowly rises, but there is no overlapping area between the movable drain hole and the fixed drain hole, the drain cannot flow out of the trap, and the water storage height when the two drain holes are externally tangent is defined as the water injection level, which can ensure that the gas cannot pass through the trap.

[0035] 2) Drain stage, as the drain continues to enter the trap, the water level in the trap exceeds the water injection level, and the movable drain hole and the fixed drain hole have an overlapping area, which is defined as the variable diameter drain hole, the diameter of the variable diameter drain hole depends on the water storage height in the cylinder, and the water storage height depends on the drain flow into the trap, so the diameter of the variable diameter drain hole is ultimately determined by the drain flow, the drain flow into and out of the trap is balanced, and a connected drain state is maintained.

[0036] The drain hole diameter is determined, the diameters of the movable drain hole and the fixed drain hole are the same, the diameters of the two drain holes need to consider the maximum drain amount, the pressure difference before and after, and the flow coefficient of the drain hole, and a certain safety margin is left.

[0037] The above specific technical solutions are only used to illustrate the present application, but not to limit it.

[0038] Although the present application is described in detail with reference to the above specific technical solutions, those skilled in the art should understand that the above specific technical solutions can be modified, or some technical features can be replaced by equivalents, and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the present application.

Claims

1. A steam trap capable of automatically adjusting the amount of steam according to the steam flow, characterized in that: the steam trap comprises a steam trap shell, a steam inlet on the steam trap shell, a steam outlet on the steam trap shell, and an adjusting device; the adjusting device is placed in the steam trap shell, which has a space that can be sealed, and the adjusting device is capable of automatically adjusting the amount of steam according to the steam flow.

2. The steam trap capable of automatically adjusting the amount of steam according to the steam flow according to claim 1, characterized in that: the steam trap shell is in the shape of a cylinder or a cylinder-like shape, and the cylinder is either a one-piece structure or a combined structure.

3. The steam trap capable of automatically adjusting the amount of steam according to the steam flow according to claim 2, characterized in that: the cylinder is further provided with a gas outlet (5) and a blowdown outlet (12).

4. The steam trap capable of automatically adjusting the amount of steam according to the steam flow according to claim 2, characterized in that: the steam trap shell is a cylinder and is a combined structure, which comprises an upper flange (3), an upper flange cover (4), a lower cover plate (11), and a spring fixing device, which can be a spring fixing stud (6).

5. The steam trap capable of automatically adjusting the amount of steam according to the steam flow according to claim 4, characterized in that: the initial position of the movable steam hole is below the fixed steam hole, and there is no overlap and a certain safety distance is left.

6. The steam trap capable of automatically adjusting the amount of steam according to the steam flow according to claim 5, characterized in that: the float is a cylindrical float, and the instantaneous distance of the variable-diameter steam hole is approximately linearly related to the water height in the steam trap, where the instantaneous distance can be represented by one of the height, length, width, or diameter.

7. The steam trap capable of automatically adjusting the amount of steam according to the steam flow according to claim 6, characterized in that: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The configuration of the tension spring, the wire diameter, the medium diameter and the number of turns of the tension spring are determined by the weight of the float and the displacement amplitude of the float. In the waterless state, the spring tension is equal to the gravity of the float. In the water storage state, the float rises and the elongation of the spring decreases. A small part of the gravity of the float is shared by the buoyancy. The displacement amplitude of the float is determined by the pressure difference and the flow rate of the drain. The optimal value is 2 times the diameter of the fixed drain hole + a certain displacement blind area. The cylindrical float is made of stainless steel. A certain length of cylinder is closed by two hollow hemispheres. The float has a certain wall thickness. The maximum submerged height of the float is 3 / 4 of the total height of the float. At this time, the buoyancy should ensure that the float rises to the upper limit position. At this time, the movable drain hole and the fixed drain hole are completely overlapped. That is, the diameter of the variable diameter drain hole reaches the maximum value.

8. The drain according to claim 7, wherein: The material of the tension spring is stainless steel wire. The wire diameter, the medium diameter and the number of turns of the tension spring are determined by the weight of the float and the displacement amplitude of the float. The maximum allowable tension of the spring should be greater than the gravity of the float. The k value of the spring is 80% of the designed buoyancy divided by the displacement amplitude of the float. 20% of the designed buoyancy is used to overcome the friction. The movable guide column is rigidly connected to the bottom of the float. Two notches and a movable drain hole are processed in the middle part of the movable guide column. The lower end of the movable guide column is inserted into the guide limiting block at the bottom of the drain. The guide limiting block is fixed on the lower cover plate of the drain. It limits the float to only move up and down, and cannot rotate. It also limits the upper limit value of the float. The fixed drain hole screw is installed in the drain outlet pipe, close to the notch part of the movable drain hole guide column. The fixed drain hole screw is also used to limit the lower limit value of the float. The fixed drain hole is communicated with the drain outlet, which can guide the drain into the condenser when the diameter of the variable diameter drain hole is not zero.

9. A control method of automatically adjusting the amount of drain water in accordance with the flow rate of drain water, characterized by, The steps include: The water injection step: there is no water storage in the drain. The drain enters the drain. The water storage in the drain slowly rises. The float slowly rises with it. However, there is no overlapping area between the movable drain hole and the fixed drain hole. The drain cannot flow out of the drain. When the two drain holes are externally tangent, the water storage height is defined as the water injection level. This water level can submerge the two drain holes to ensure that gas cannot pass through the drain. The drain step: as the drain continues to enter the drain, the water level in the drain exceeds the water injection level. An overlapping area is generated between the movable drain hole and the fixed drain hole. This overlapping area is defined as the variable diameter drain hole. The diameter of the variable diameter drain hole depends on the water storage height in the cylinder, and the water storage height depends on the drain flow rate entering the drain. Therefore, the diameter of the variable diameter drain hole is ultimately determined by the drain flow rate. The balance between the drain flow rate into and out of the drain is maintained, and a connected drain state is maintained.

10. The control method according to claim 9, wherein: The drain hole diameter determination step is also included. In this step, it is first considered that the diameters of the movable drain hole and the fixed drain hole are the same. The diameters of the two drain holes need to consider the maximum drain amount, the pressure difference before and after, and the flow coefficient of the drain hole. A certain safety margin is left.

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