Intelligent drain valve and control method

Abstract

The intelligent drain valve comprises a valve body assembly, a valve cover assembly is fixedly installed on the surface of the valve body assembly, and a control box assembly is fixedly installed on the surface of the valve cover assembly. A filter screen assembly is fixedly installed in the valve deck assembly and comprises a filter screen cover, a filter screen frame and an outer lining screen, the filter screen frame is fixedly installed at an inlet of a medium in the valve deck assembly, the outer lining screen is fixedly connected to the outer wall face of the filter screen frame, the filter screen cover is fixedly connected to the upper portion of the filter screen frame, and the filter screen cover is located on the surface of the valve deck assembly. The valve has the beneficial effects that various different media can be judged according to the temperature and pressure in the valve body, then opening and closing of the valve body are achieved, the integration performance is efficient and reliable, maintenance is convenient, the service life is long, required parameter values can be designed according to the requirements of various pipelines, operation is more efficient and convenient, and the application range is wide.

Description

Technical Field

[0001] The present invention relates to the technical field of valve equipment, and specifically to an intelligent steam trap and a control method therefor. Background Art

[0002] With the in-depth development of the country's energy conservation and emission reduction work, many industries have gained an in-depth understanding and certain applications of the use of steam and energy consumption. As the most common and essential energy-saving valve in the steam system, steam traps are widely used in industries such as metallurgy, petroleum, chemical industry, and medicine. Currently, existing traditional steam traps mainly rely on working principles such as gravity recognition of mechanical components, temperature change recognition of temperature-sensitive elements, and hydrodynamic pressure change recognition to automatically identify the properties of the medium and achieve the function of steam-blocking and condensate-draining valves. Traditional steam traps can meet the function of steam-blocking and condensate-draining, but issues that customers are concerned about, such as when the valve opens and closes, what the current working state is, how much the condensate flow rate is, the quality of the valve, and whether there are phenomena such as air locking and steam resistance, cannot be promptly reflected, seriously affecting the use of steam traps and being unfavorable for users to master the valve operation conditions.

[0003] Currently, there is no intelligent valve that can achieve automatic opening and closing of the valve by sensing the pressure and temperature inside the valve body. As a device that can automatically identify whether the medium in a pipeline or equipment is steam or condensate and automatically prevent steam from flowing out and drain condensate, intelligent steam traps have wide applicability; different intelligent steam traps of different specifications are selected for different working conditions, and at the same time, according to the needs of users, valves with different functions are selected, and functions such as local display and remote transmission display of the valve operation are synchronously transmitted and monitored, and forced valve opening for local and remote control are implemented. Intelligent steam traps can be applied to various condensate drainage pipeline equipment and various condensate drainage working conditions, with a wide application range and obvious social and economic benefits. Therefore, it is necessary to design an intelligent valve to solve the above technical problems. Summary of the Invention

[0004] The purpose of the present invention is to provide an intelligent steam trap and a control method therefor with a reasonable structural design, more convenient operation, capable of judging various different media according to the temperature and pressure inside the valve body, thereby realizing the opening and closing of the valve body, having high integration performance, being reliable, easy to maintain, having a long service life, capable of designing required parameter values according to the needs of various pipelines, having more efficient and convenient operation, and having a wide application range.

[0005] An intelligent steam trap of the present invention includes a valve body assembly, a valve cover assembly is fixedly installed on the surface of the valve body assembly, and a control box assembly is fixedly installed on the surface of the valve cover assembly; The control box assembly includes an all-in-one machine, a control box, and a bracket. The bottom end of the bracket is fixedly installed on the surface of the valve cover assembly, the top end of the bracket is fixedly installed with the control box, and the all-in-one machine is fixedly installed inside the control box; The valve cover assembly is fixedly installed on the surface of the valve body assembly, and the two form a sealed space to accommodate the entry of condensed water, buffer the inflow of condensed water, and separate the gas phase and liquid phase. At the same time, a control box assembly is connected and arranged on the surface of the valve cover assembly. The control box can receive the temperature and pressure signals of various different media inside the valve body assembly. The integrated machine judges the valve state corresponding to the signals of different current media and issues an execution command. Furthermore, the integrated machine controls the active valve to be in an open or closed state, and thus can complete the opening and closing of the valve according to different media signals, making the operation more convenient, flexible, and easy to maintain. It replaces the traditional steam trap that needs to automatically identify the properties of the medium based on the working principles such as the gravity recognition of mechanical components, the temperature change recognition of temperature-sensitive elements, and the hydrodynamic pressure change recognition to realize the function of the steam trap for steam blocking and drainage. It breaks through the limitations of traditional steam traps that can only rely on gravity control, thermal control, etc., and proposes a new type of intelligent and controllable steam trap structure and principle, that is, by collecting the real-time pressure and temperature of different media in the valve body assembly, performing logical operations with the database, and judging whether the medium phase state in the current valve body assembly is condensed water or steam. When it is judged to be condensed water through the operation, the active valve is controlled to open to discharge the condensed water, and when it is judged to be steam, the active valve is controlled to close to prevent the steam from discharging. This device has a high degree of digitization, high reliability in the opening and closing of the steam trap, a steam leakage rate of zero, can be connected to a wired communication module, and communicate, remotely monitor, and remotely operate with DCS centralized control. It can also remotely force the valve to open, or be connected to a wireless WiFi and mobile data communication module to achieve communication, remote monitoring, and remote operation.

[0006] The described valve cover assembly includes a valve cover, a nozzle, a temperature transmitter, a pressure transmitter, an active valve, and a flange. Flanges are respectively installed on the side walls of the valve cover, and the two flanges are located on the opposite sides of the side wall of the valve cover and are symmetrically arranged along the center of the valve cover; a nozzle is fixedly connected to the side wall of the valve cover; a temperature transmitter and a pressure transmitter are respectively fixedly installed on the surface of the valve cover, an active valve is fixedly installed on the surface of the valve cover, and the valve cover is fixedly connected to the bracket through hexagon bolts.

[0007] The function of the provided valve cover assembly is to connect various feedback instruments, connect the actuating active valve, and support the control box. Through fixed flow channels and fixed flow directions, the condensed water is input and output from the valve.

[0008] The described valve body assembly includes a valve body, a gasket, and a plug. A plug is fixedly installed on the bottom side wall of the valve body, a gasket is arranged at the contact surface between the plug and the valve body, and the valve body is fixedly connected to the valve cover through stud bolts, hexagon nuts, and gaskets.

[0009] The valve body is set as a bowl-shaped structure. When the valve is closed, this structure enables the medium to flow smoothly into the valve body, playing a buffering and separating role, and can effectively separate the condensate water and steam. When the condensate water contacts the probe, the feedback temperature and pressure digital quantity parameters participate in the operation, calculate the parameter values, and then judge the nature of the medium, that is, whether the medium is condensate water with a certain degree of subcooling, or steam with a certain degree of superheat or saturation. The bowl-shaped valve body is a sufficient condition for realizing the functions of this structure, providing guarantee for the PLC integrated machine to define the medium attribute inside the valve, and the valve works stably and reliably.

[0010] A filter screen assembly is fixedly installed inside the valve cover assembly. The filter screen assembly includes a filter screen cover, a filter screen frame, and an outer lining screen. The filter screen frame is fixedly installed at the inlet of the medium inside the valve cover assembly. The outer wall surface of the filter screen frame is fixedly connected with the outer lining screen, and the filter screen cover is fixedly connected above the filter screen frame. The filter screen cover is arranged on the surface of the valve cover assembly.

[0011] The function of the filter screen assembly is to prevent impurity particles in the water delivery pipeline from entering the valve body, protecting the precision opening and closing parts inside the valve body from damage; the filter screen cover of the filter screen assembly is arranged on the surface of the valve cover assembly, exposed outside the valve cover assembly, facilitating disassembly and cleaning, facilitating the maintenance of the entire steam trap, and simplifying the maintenance steps.

[0012] A control method for an intelligent steam trap, the method includes the following steps: S1. Initial state: The steam trap is fixedly installed on the steam trap pipeline through a flange. There is air in the valve body. The control box receives temperature and pressure signals, and the integrated machine judges the valve state corresponding to the current signals and issues an execution command. The integrated machine controls the actuating valve to be in a closed state. S2. Liquid inlet state: That is, the state where the condensate water in the initial state flows into the valve body. The condensate water flows into the valve body through the filter screen assembly, and the air in the valve body flows out in the reverse direction, completing the process of gas-water replacement. The integrated machine judges the valve state corresponding to the current signals and issues an execution command. The actuating valve remains closed. S3. Drainage state: That is, the condensate water discharge state. The condensate water continuously flows into the valve body. The integrated machine performs operations and judgments based on the collected temperature and pressure values, issues an execution command, and the integrated machine controls the actuating valve to open. The condensate water continuously flows in from the inlet and flows out from the outlet through the actuating valve flow channel. S4. Running liquid inlet state: That is, the state where the condensate water in the running state flows into the valve body. The condensate water flows into the valve body through the filter screen assembly, and the steam in the valve body flows out in the reverse direction, completing the process of steam-water replacement. The integrated machine judges the valve state corresponding to the current signals and issues an execution command to control the actuating valve to close, and runs in this way repeatedly.

[0013] Advantages of the present invention: 1) The valve cover assembly is fixedly installed on the surface of the valve body assembly. The two form a sealed space to accommodate the condensate to enter, buffer the inflow of condensate, and separate the gas phase from the liquid phase. At the same time, a control box assembly is connected and arranged on the surface of the valve cover assembly. The control box can receive the temperature and pressure signals of various different media inside the valve body assembly. The integrated machine judges the valve state corresponding to the signals of different media currently, issues an execution command, and then the integrated machine controls the actuating valve to be in an open or closed state. Thus, the opening and closing of the valve can be completed according to different media signals, and the operation is more convenient, flexible, and easy to maintain. It replaces the working principle of traditional steam traps that rely on mechanical component gravity recognition, temperature change recognition of temperature-sensitive elements, and fluid dynamic pressure change recognition to automatically identify the properties of the medium to achieve the function of steam-trapping drain valves. It breaks through the limitations of traditional steam traps that can only rely on gravity control, thermal control, etc., and proposes a new type of intelligent and controllable steam trap structure and principle, that is, by collecting the real-time pressure and temperature of different media in the valve body assembly, performing logical operations with the database, and judging whether the medium state in the current valve body assembly is condensate or steam. When it is judged to be condensate through the operation, the actuating valve is controlled to open to drain the condensate, and when it is judged to be steam, the actuating valve is controlled to close to prevent the steam from discharging. This device has a high degree of digitization, high reliability in the opening and closing of the steam trap, a steam leakage rate of zero, can be connected to a wired communication module, and communicate, remotely monitor, and remotely operate with DCS centralized control. It can also remotely force the valve to open, or be connected to a wireless WiFi and mobile data communication module to achieve communication, remote monitoring, and remote operation.

[0014] 2) The function of the set valve cover assembly is to connect each feedback instrument, connect the actuating valve, and support the control box. Through the fixed flow path and fixed flow direction, the condensate is input and output from the valve.

[0015] 3) The valve body is set as a bowl-shaped structure. When the valve is closed, this structure can make the medium flow into the valve body smoothly, playing a buffering and separating role, and can effectively separate the condensate from the steam. When the condensate contacts the probe, the feedback temperature and pressure digital quantity parameters participate in the operation, calculate the parameter values, and then judge the nature of the medium, that is, whether the medium is condensate with a certain degree of subcooling, or steam with a certain degree of superheat or saturation. The bowl-shaped valve body is a sufficient condition to realize the function of this structure, providing guarantee for the PLC integrated machine to define the medium attributes inside the valve, and the valve works stably and reliably.

[0016] 4) The function of the filter net assembly is to prevent impurity particles in the water delivery pipeline from entering the valve body and protect the precision opening and closing parts inside the valve body from being damaged; the filter net cover of the filter net assembly is arranged on the surface of the valve cover assembly and is exposed outside the valve cover assembly, which is convenient for disassembly and cleaning, facilitating the maintenance of the entire steam trap and simplifying the maintenance steps.

[0017] 5) The device is reasonably structured, more convenient to operate, and can judge various different media according to the temperature and pressure inside the valve body, thereby realizing the opening and closing of the valve body. It has high-efficiency and reliable integrated performance, is easy to maintain, has a long service life, can design the required parameter values according to the needs of various pipelines, is more efficient and convenient to operate, has a wide range of applications, and is suitable for working occasions with a nominal pressure of 1.6 MPa and a working pressure difference of 1.0 Mpa·G or less. The shell can withstand a pressure of 3.75 MPa·G (1.5 times the nominal pressure), the pressure difference is 1.0 MPa·G, and the maximum condensate discharge is 10 t / h. It can realize an automatically controlled valve that can be switched on and off, requires no on-site monitoring, and can be remotely detected and operated. It is safe and reliable to use and is worthy of wide promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural view of the intelligent steam trap of the present invention; Figure 2 is Figure 1 the top view of Figure 3 is Figure 1 the left view of Figure 4 is the front view of the valve body in FIG. 1; Figure 5 is Figure 4 the sectional view of the valve body of Figure 6 is Figure 1 the front view of the valve cover of Figure 7 is Figure 6 the top view of the valve cover of Figure 8 is the front view of the control box in the present invention; Figure 9 is Figure 8 the left view of Figure 10 is a schematic view of the media air, condensate, and steam in the present invention; Figure 11 is a schematic view of the initial operation in the present invention; Figure 12 is a schematic view of the initial water inlet state in the present invention; Figure 13 is a schematic view of the drainage state in the present invention; Figure 14 is a schematic view of the water inlet state in the present invention.

[0019] In the figure: valve body assembly 1, valve body 1-1, gasket 1-2, plug 1-3, valve cover assembly 2, valve cover 2-1, connecting pipe 2-2, temperature transmitter 2-3, pressure transmitter 2-4, actuating valve 2-5, flange 2-6, filter screen assembly 3, filter screen cover 3-1, filter screen frame 3-2, outer lining screen 3-3, control box assembly 4, all-in-one machine 4-1, control box 4-2, support 4-3. Detailed implementation manners

[0020] Embodiment 1. The following will further describe the present invention with reference to the Figures 11 - 14 accompanying drawings.

[0021] The present invention includes a valve body assembly 1, a valve body 1-1, a gasket 1-2, a plug 1-3, a valve cover assembly 2, a valve cover 2-1, a connecting pipe 2-2, a temperature transmitter 2-3, a pressure transmitter 2-4, an actuating valve 2-5, a flange 2-6, a control box assembly 4, an all-in-one machine 4-1, a control box 4-2, and a support 4-3. Specifically, for the structure of the valve body assembly 1, a valve cover assembly 2 is fixedly installed on the surface of the valve body assembly 1, and a control box assembly 4 is fixedly installed on the surface of the valve cover assembly 2.

[0022] The control box assembly 4 includes an all-in-one machine 4-1, a control box 4-2, and a support 4-3. The bottom end of the support 4-3 is fixedly installed on the surface of the valve cover assembly 2, the top end of the support 4-3 is fixedly installed with a control box 4-2, and an all-in-one machine 4-1 is fixedly installed inside the control box 4-2.

[0023] The valve cover assembly 2 includes a valve cover 2-1, a connecting pipe 2-2, a temperature transmitter 2-3, a pressure transmitter 2-4, an actuating valve 2-5, and a flange 2-6. Flanges 2-6 are respectively installed on the side walls of the valve cover 2-1, and the two flanges 2-6 are located on the opposite sides of the side wall of the valve cover 2-1 and are symmetrically arranged along the center of the valve cover 2-1; a connecting pipe 2-2 is fixedly connected to the side wall of the valve cover 2-1; a temperature transmitter 2-3 and a pressure transmitter 2-4 are respectively fixedly installed on the surface of the valve cover 2-1, an actuating valve 2-5 is fixedly installed on the surface of the valve cover 2-1, and the valve cover 2-1 and the support 4-3 are tightly connected by hexagon bolts.

[0024] The valve body assembly 1 includes a valve body 1-1, a gasket 1-2, and a plug 1-3. A plug 1-3 is fixedly installed on the bottom side wall of the valve body 1-1, a gasket 1-2 is arranged at the contact surface between the plug 1-3 and the valve body 1-1, and the valve body 1-1 and the valve cover 2-1 are tightly connected by stud bolts, hexagon nuts and gaskets.

[0025] The model of the temperature transmitter 2-3 is: WZPKB-728S; the model of the pressure transmitter 2-4 is: TKYBS-316.

[0026] A control method for an intelligent steam trap, the method comprising the following steps: S1. Initial state: The steam trap is fixedly installed on the steam condensate pipeline through a flange. There is air in the valve body 1-1. The control box 4-2 receives temperature and pressure signals. The integrated machine 4-1 judges the valve state corresponding to the current signal and issues an execution command. The integrated machine 4-1 controls the actuating valve 2-5 to be in a closed state. S2. Liquid inlet state: That is, the state where the condensate water in the initial state flows into the valve body 1-1. The condensate water flows into the valve body 1-1 through the filter screen assembly 3. The air in the valve body 1-1 flows out in the reverse direction, completing the process of gas-water replacement. The integrated machine 4-1 judges the valve state corresponding to the current signal and issues an execution command. The actuating valve 2-5 remains closed. S3. Drainage state: That is, the condensate water discharge state. The condensate water in the valve body 1-1 continuously flows in. The integrated machine 4-1 performs operations and judgments through the collected temperature and pressure values and issues an execution command. The integrated machine 4-1 controls the actuating valve 2-5 to open. The condensate water continuously flows in from the inlet and flows out from the outlet through the flow channel of the actuating valve 2-5. S4. Operating liquid inlet state: That is, the state where the condensate water in the operating state flows into the valve body 1-1. The condensate water flows into the valve body 1-1 through the filter screen assembly 3. The steam in the valve body 1-1 flows out in the reverse direction, completing the process of steam-water replacement. The integrated machine 4-1 judges the valve state corresponding to the current signal and issues an execution command to control the actuating valve 2-5 to close, and runs in this way repeatedly.

[0027] Embodiment 2. The present invention includes a valve body assembly 1, a valve body 1-1, a gasket 1-2, a plug 1-3, a valve cover assembly 2, a valve cover 2-1, a connecting pipe 2-2, a temperature transmitter 2-3, a pressure transmitter 2-4, an actuating valve 2-5, a flange 2-6, a filter screen assembly 3, a filter screen cover 3-1, a filter screen frame 3-2, an outer lining screen 3-3, a control box assembly 4, an integrated machine 4-1, a control box 4-2, and a bracket 4-3. Specifically, for the structure of the valve body assembly 1, the valve cover assembly 2 is fixedly installed on the surface of the valve body assembly 1, and the control box assembly 4 is fixedly installed on the surface of the valve cover assembly 2.

[0028] The control box assembly 4 includes an integrated machine 4-1, a control box 4-2, and a bracket 4-3. The bottom end of the bracket 4-3 is fixedly installed on the surface of the valve cover assembly 2, and the top end of the bracket 4-3 is fixedly installed with a control box 4-2. The integrated machine 4-1 is fixedly installed in the control box 4-2.

[0029] The described valve cover assembly 2 includes a valve cover 2-1, a connecting pipe 2-2, a temperature transmitter 2-3, a pressure transmitter 2-4, a motorized valve 2-5, and a flange 2-6. Flanges 2-6 are respectively installed on the side walls of the valve cover 2-1. The two flanges 2-6 are located on the opposite sides of the side wall of the valve cover 2-1 and are symmetrically arranged along the center of the valve cover 2-1. A connecting pipe 2-2 is fixedly connected to the side wall of the valve cover 2-1. A temperature transmitter 2-3 and a pressure transmitter 2-4 are respectively fixedly installed on the surface of the valve cover 2-1, and a motorized valve 2-5 is fixedly installed on the surface of the valve cover 2-1. The valve cover 2-1 and the bracket 4-3 are tightly connected by hexagon bolts.

[0030] The described valve body assembly 1 includes a valve body 1-1, a gasket 1-2, and a plug 1-3. A plug 1-3 is fixedly installed on the bottom side wall of the valve body 1-1. A gasket 1-2 is arranged at the contact surface between the plug 1-3 and the valve body 1-1. The valve body 1-1 and the valve cover 2-1 are tightly connected by stud bolts, hexagon nuts, and gaskets.

[0031] A filter screen assembly 3 is fixedly installed inside the valve cover assembly 2. The filter screen assembly 3 includes a filter screen cover 3-1, a filter screen frame 3-2, and an outer lining screen 3-3. The filter screen frame 3-2 is fixedly installed at the inlet of the medium inside the valve cover assembly 2. The outer wall surface of the filter screen frame 3-2 is fixedly connected to the outer lining screen 3-3. A filter screen cover 3-1 is fixedly connected above the filter screen frame 3-2, and the filter screen cover 3-1 is arranged on the surface of the valve cover assembly 2.

[0032] The model of the temperature transmitter 2-3 is: WZPKB-728S; the model of the pressure transmitter 2-4 is: TKYBS-316.

[0033] A control method for an intelligent steam trap, the method includes the following steps: S1. Initial state: The steam trap is fixedly installed on the steam trap pipeline through a flange. There is air in the valve body 1-1. The control box 4-2 receives temperature and pressure signals. The integrated machine 4-1 judges the valve state corresponding to the current signal and issues an execution command. The integrated machine 4-1 controls the motorized valve 2-5 to be in a closed state. S2. Liquid inlet state: That is, the state where the condensate water in the initial state flows into the valve body 1-1. The condensate water flows into the valve body 1-1 through the filter screen assembly 3, and the air in the valve body 1-1 flows out in the reverse direction, completing the process of gas-water replacement. The integrated machine 4-1 judges the valve state corresponding to the current signal and issues an execution command. The motorized valve 2-5 remains closed. S3. Drainage state: That is, the condensate water discharge state. The condensate water continuously flows into the valve body 1-1. The integrated machine 4-1 performs operations and judgments through the collected temperature and pressure values, issues an execution command. The integrated machine 4-1 controls the motorized valve 2-5 to open. The condensate water continuously flows in from the inlet and flows out from the outlet through the flow channel of the motorized valve 2-5. S4. Running into the liquid state: That is, the state where the condensed water in the running state flows into the valve body 1-1. The condensed water flows into the valve body 1-1 through the filter screen assembly 3, and the steam in the valve body 1-1 flows out in the reverse direction to complete the process of steam-water replacement. The integrated machine 4-1 judges the valve state corresponding to the current signal and issues an execution command to control the active valve 2-5 to close, and runs in this way repeatedly.

Claims

1. An intelligent steam trap, characterized in that: It includes a valve body assembly (1), a valve cover assembly (2) is fixedly installed on the surface of the valve body assembly (1), and a control box assembly (4) is fixedly installed on the surface of the valve cover assembly (2); The control box assembly (4) includes an all-in-one machine (4-1), a control box (4-2), and a bracket (4-3). The bottom end of the bracket (4-3) is fixedly installed on the surface of the valve cover assembly (2), the top end of the bracket (4-3) is fixedly installed with a control box (4-2), and an all-in-one machine (4-1) is fixedly installed inside the control box (4-2); The valve cover assembly (2) includes a valve cover (2-1), a connecting pipe (2-2), a temperature transmitter (2-3), a pressure transmitter (2-4), a power-operated valve (2-5), and a flange (2-6). Flanges (2-6) are respectively installed on the side walls of the valve cover (2-1), and the two flanges (2-6) are located on the opposite sides of the side wall of the valve cover (2-1), and are symmetrically arranged along the center of the valve cover (2-1); a connecting pipe (2-2) is fixedly connected to the side wall of the valve cover (2-1); a temperature transmitter (2-3) and a pressure transmitter (2-4) are respectively fixedly installed on the surface of the valve cover (2-1), a power-operated valve (2-5) is fixedly installed on the surface of the valve cover (2-1), and the valve cover (2-1) and the bracket (4-3) are tightly connected by hexagon bolts.

2. The intelligent steam trap according to claim 1, wherein: The described valve body assembly (1) includes a valve body (1-1), a sealing gasket (1-2), and a plug (1-3). A plug (1-3) is fixedly installed on the bottom side wall of the valve body (1-1), a sealing gasket (1-2) is arranged at the contact surface between the plug (1-3) and the valve body (1-1), and the valve body (1-1) and the valve cover (2-1) are tightly connected by stud bolts and hexagon nuts with a sealing gasket.

3. The intelligent steam trap according to claim 2, wherein: A filter screen assembly (3) is fixedly installed inside the valve cover assembly (2). The filter screen assembly (3) includes a filter screen cover (3-1), a filter screen frame (3-2), and an outer lining screen (3-3). The filter screen frame (3-2) is fixedly installed at the inlet of the medium inside the valve cover assembly (2), the outer wall surface of the filter screen frame (3-2) is fixedly connected with the outer lining screen (3-3), a filter screen cover (3-1) is fixedly connected above the filter screen frame (3-2), and the filter screen cover (3-1) is arranged on the surface of the valve cover assembly (2).

4. The control method of an intelligent steam trap according to claim 3, characterized in that, This method includes the following steps: S1. Initial state: The steam trap is fixedly installed on the steam condensate pipeline through a flange. There is air in the valve body (1-1). The control box (4-2) receives temperature and pressure signals. The all-in-one machine (4-1) judges the valve state corresponding to the current signals, issues an execution command, and the all-in-one machine (4-1) controls the power-operated valve (2-5) to be in a closed state for preservation; S2. Liquid inlet state: That is, the state where the condensate water in the initial state flows into the valve body (1-1). The condensate water flows into the valve body (1-1) through the filter screen assembly (3), and the air in the valve body (1-1) flows out in the reverse direction to complete the process of gas-water replacement. The all-in-one machine (4-1) judges the valve state corresponding to the current signals, issues an execution command, and the power-operated valve (2-5) remains in a closed state; S3. Drainage state: That is, the condensate discharge state. The condensate in the valve body (1-1) continuously flows in. The integrated machine (4-1) performs operations and judgments based on the collected temperature and pressure values, issues execution commands, and the integrated machine (4-1) controls the active valve (2-5) to open. The condensate continuously flows in from the inlet and flows out from the outlet through the flow path of the active valve (2-5); S4. Operating liquid inlet state: That is, the state of condensate flowing into the valve body (1-1) under the operating state. The condensate flows into the valve body (1-1) through the filter screen assembly (3). The steam in the valve body (1-1) flows out in the reverse direction to complete the process of steam-water replacement. The integrated machine (4-1) judges the valve state corresponding to the current signal and issues an execution command to control the active valve (2-5) to close, and operates in this way repeatedly.

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