Dual-electrode intelligent steam trap and control method

Abstract

The dual-electrode intelligent steam trap comprises a valve body, a valve body inner cavity is formed in the valve body, a valve cover is fixedly installed on the surface of the valve body, an inlet flange is fixedly installed on one side of the valve cover, a water inlet pipeline is arranged in the inlet flange and the valve cover, and the water inlet pipeline communicates with the valve body inner cavity; an outlet flange is fixedly mounted on the other side of the valve cover, a water outlet pipeline is arranged in the outlet flange and the valve cover, the end of the water outlet pipeline is fixedly mounted with an electromagnetic valve, a valve core is arranged in the electromagnetic valve and located at the end of the water outlet pipeline, and the electromagnetic valve is fixedly mounted on the surface of the valve cover; an electromagnetic valve cable is fixedly installed on the electromagnetic valve and connected with the PLC control system output module. The device has the beneficial effects that the electric conductivity difference of condensed water and steam is utilized, the state of a medium in the cavity is detected in real time through the double-electrode probe, precise on-off control of the electromagnetic valve is achieved in combination with the PLC control system, the condensed water is accurately discharged in time, steam waste is avoided, and the running efficiency of a steam system is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steam water conveying equipment, in particular to a double-electrode intelligent steam drain valve and control method. BACKGROUND

[0002] In industrial production, steam, as an important heat carrier, is widely used in heating, drying, sterilization and other process links. During steam transportation and use, steam will condense into water, i.e. condensate, if the condensate cannot be discharged in time and efficiently, it will lead to problems such as decrease of steam system thermal efficiency, pipeline corrosion, equipment damage, and even water hammer phenomenon in serious cases, threatening the safe operation of the system.

[0003] At present, the mainstream steam drain valves on the market mainly include mechanical type, thermal static type, thermal dynamic type and other types. The mechanical drain valve relies on a floating ball or a bucket to drive the valve to open and close with the change of condensate level, but it has problems such as easy wear of mechanical parts, floating ball jamming, high requirement for water quality, and impurities easily causing sealing failure. The thermal static drain valve uses temperature sensing elements such as paraffin and corrugated pipe to control the valve through thermal expansion and contraction, which has slow response speed, is easily disturbed by environmental temperature, and has low control precision. The thermal dynamic drain valve works based on the flow rate difference between steam and condensate, which has defects such as discontinuous drainage, easy "steam resistance" phenomenon, and direct steam discharge causing heat energy waste.

[0004] In addition, most of the existing drain valves are mechanically controlled, lack intelligent monitoring and remote control capabilities, cannot real-time feedback the working state of the valve, and are difficult to dynamically adjust the drainage strategy according to the system working condition, resulting in low running efficiency and high energy consumption of the steam system, which cannot meet the needs of modern industry for intelligent and energy-saving equipment.

[0005] Therefore, it is a technical problem to be solved in the current steam water conveying equipment field to develop a steam drain valve that can accurately identify steam and condensate, realize intelligent control, and run stably and reliably. SUMMARY

[0006] The purpose of the present application is to provide a double-electrode intelligent steam drain valve and control method with reasonable structure design, easy processing, low processing and manufacturing cost, and more convenient operation, which utilizes the conductivity difference between condensate and steam, detects the medium state inside the cavity in real time through a double-electrode probe, and realizes precise on-off control of the electromagnetic valve combined with a PLC control system, so as to achieve the purposes of timely and precise discharge of condensate, avoidance of steam waste, and improvement of the running efficiency of the steam system.

[0007] The application discloses a double-electrode intelligent steam drain valve, which comprises a valve body, a valve body cavity is arranged in the valve body, a valve cover is fixedly installed on the surface of the valve body, an inlet flange is fixedly installed on one side of the valve cover, a water inlet pipeline is arranged in the valve cover and communicates with the valve body cavity, an outlet flange is fixedly installed on the other side of the valve cover, a water outlet pipeline is arranged in the valve cover and fixedly connected with an electromagnetic valve, a valve core is arranged in the electromagnetic valve and located at the end of the water outlet pipeline, the electromagnetic valve is fixedly installed on the surface of the valve cover, and an electromagnetic valve cable is fixedly installed on the electromagnetic valve and connected with an output module of a PLC control system.

[0008] A signal acquisition module is arranged in the PLC control system, an upper electrode shielding cable and a lower electrode shielding cable are respectively connected to the signal acquisition module, upper electrode probes and lower electrode probes are fixedly connected to the ends of the upper electrode shielding cable and the lower electrode shielding cable respectively, and the upper electrode probes and the lower electrode probes are fixedly installed in the valve body cavity through the valve body.

[0009] Threaded holes are formed in the side wall of the valve body, the number of the threaded holes is two, the threaded holes are vertically distributed, the upper electrode probes and the lower electrode probes are fixedly installed in the threaded holes respectively, the lower electrode probes are fixedly installed close to the bottom surface of the valve body, and the upper electrode probes are fixedly installed above the lower electrode probes.

[0010] The valve body and the valve cover constitute the main body of the steam drain valve, when in the initial stage, condensed water enters the valve body cavity through the water inlet pipeline, the upper electrode probes and the lower electrode probes arranged in the valve body cavity can use the conductivity difference between the condensed water and steam in the valve body cavity as a detection basis, the double-electrode probes can accurately identify the medium state, the collected information can be transmitted to the signal acquisition module arranged in the PLC control system through the upper electrode shielding cable and the lower electrode shielding cable, and then the PLC control system can identify whether the electromagnetic valve needs to be opened, so that the condensed water is discharged through the water outlet pipeline, the operation is convenient and more intelligent, the misjudgment caused by the wear of mechanical parts and temperature interference of the traditional drain valve is avoided, and the accuracy of the condensed water discharge is greater than or equal to 98%.

[0011] The PLC control system can realize automatic control, can be expanded to have remote communication function, supports linkage with an upper computer, is convenient for real-time monitoring of the running state of equipment, remote adjustment of control parameters, does not need manual on-site operation, and reduces operation and maintenance cost.

[0012] The electromagnetic valve is set as an execution component with fast response speed, speed ≤0.1s, can be opened in time when the condensate water accumulates to the set liquid level, and is quickly closed after discharge, effectively avoiding steam leakage, the steam leakage rate is zero, and compared with the traditional steam trap, the thermal efficiency of the steam trap can be obviously improved; the electromagnetic valve is a mechanical wear-free electric execution component, without fragile components such as a float ball and a temperature sensing element, the equipment failure rate is low, the service life is long, the design service life is ≥5 years, and the water quality adaptability is strong, the intelligent steam trap can stably operate under the working condition of condensate water containing a small amount of impurities, is safer and more reliable to use, the maintenance frequency is reduced, and the stable operation of the steam trap can be fully ensured.

[0013] The bottom surface of the water outlet pipeline is fixedly installed with an emptying valve, the emptying valve penetrates through a valve cover and extends into the inner cavity of the valve body.

[0014] The emptying valve comprises an emptying valve spool, an emptying valve seat, a bimetallic strip, an adjusting nut and a sleeve, the emptying valve seat is fixedly installed at a lower position of the water outlet pipeline, the emptying valve spool is installed in the emptying valve seat, the bottom surface of the emptying valve seat is fixedly connected with the sleeve, and the outer wall surface of the sleeve is provided with the adjusting nut; the outer wall surface of the sleeve is fixedly installed with the bimetallic strip, and the bimetallic strip is arranged above the adjusting nut.

[0015] The emptying valve is fixedly installed at the bottom surface of the water outlet pipeline and is in communication with the inner cavity of the valve body, can discharge non-condensed gas in an initial state, and can prevent the occurrence of water hammer phenomenon; if there is condensate water in the steam pipeline, high-speed flowing steam can push the accumulated condensate water to cause strong impact of the condensate water on the pipe wall, the valve and the steam using equipment, this phenomenon is called water hammer, can cause damage or destruction of the pipe bending part and the valve, can thus protect the water outlet pipeline and the electromagnetic valve, prolong the service life of the equipment, can ensure the heating efficiency of the inner cavity of the valve body, and is thus crucial for ensuring safe and efficient operation of the steam system; when the equipment is first started, the electromagnetic valve is in a closed state, in order to ensure that non-condensed gas entering the valve cavity is discharged in time without affecting the entry of fluid, the bimetallic strip is in a cold flat state at this time, the emptying valve spool is opened, and the non-condensed gas is discharged; when a large amount of hot condensate water and steam enter the valve cavity, the bimetallic strip is heated and expanded, pulls the emptying valve spool to be closed, and prevents the hot condensate water and steam from being discharged, thereby ensuring normal operation of the intelligent steam trap.

[0016] The water outlet pipeline is fixedly connected with a siphon pipe through a communication pipe, and the siphon pipe is arranged in the inner cavity of the valve body.

[0017] The siphon pipe is arranged, one end of the siphon pipe is connected to the front end of the outlet end, the other end of the siphon pipe extends to a position 10mm above the bottom of the inner cavity of the valve body, a siphon effect is formed, the condensate water discharge speed is accelerated, the water conveying efficiency is improved, and a water seal is formed to prevent steam leakage.

[0018] The side wall of the valve body is fixedly provided with a plug, which is arranged close to the lower end face of the inner cavity of the valve body; and the end of the water inlet pipe is fixedly provided with a filter screen assembly.

[0019] The plug is arranged to open when there is precipitated impurity on the bottom face of the inner cavity of the valve body, so that the precipitated impurity on the bottom of the inner cavity of the valve body can be regularly removed and cleaned, the safe and stable operation of the equipment is ensured, the condensed water in the inner cavity of the valve body can be manually discharged, the normal operation of the steam trap is ensured, and the working condition is not affected.

[0020] The filter screen assembly is arranged on the pipe at the inlet end, is made of 304 stainless steel, has a filter screen aperture of 0.5 mm and a filter area of ≥100 cm², can be removed, is convenient for regular cleaning or replacement, prevents rust and impurities in the steam water conveying system from entering the valve body, avoids blocking the upper electrode probe and the lower electrode probe or the electromagnetic valve, and comprehensively ensures the safe and stable operation of the equipment.

[0021] The PLC control system is fixedly arranged on the surface of the valve cover through a support.

[0022] The PLC control system is fixedly arranged on the surface of the valve cover through a support, can provide stable support for the PLC control system during operation, ensures the stable operation of the PLC control system, and ensures that the overall structure is stable and beautiful.

[0023] A control method of a double-electrode intelligent steam trap, the method comprising the following steps: S1. Initial state: the electromagnetic valve is in a closed state, and the condensed water of the steam trap enters the inner cavity of the valve body through the water inlet pipe; S2. Condensed water accumulation stage: as the condensed water continuously accumulates in the inner cavity of the valve body, the liquid level gradually rises, when the liquid level rises to the detection end of the lower electrode probe, the lower electrode probe detects that the medium is condensed water, i.e. the electrical conductivity is greater than 50 μS / cm, and transmits the signal to the PLC control system; the upper electrode probe detects that the medium is steam, i.e. the electrical conductivity is 0 μS / cm, the PLC control system determines that the condensed water has not accumulated to the liquid level that needs to be discharged, and the electromagnetic valve remains closed; S3. Condensed water discharge stage: when the condensed water continues to accumulate in the inner cavity of the valve body, the liquid level rises to the detection end of the upper electrode probe, the upper electrode probe and the lower electrode probe both detect that the medium is condensed water, i.e. the electrical conductivity is greater than 50 μS / cm, the PLC control system receives the signal, judges by the program, outputs an opening signal of the electromagnetic valve, the electromagnetic valve driving unit is powered on, the valve core is opened, and the condensed water is discharged through the siphon pipe and the water outlet pipe in turn; S4. Valve closing stage: As condensate is discharged, the liquid level in the valve body gradually decreases. When the lower electrode probe detects that the medium is steam, i.e., the conductivity is 0μS / cm, the PLC control system determines that the condensate has been discharged. After the program judges, it outputs a valve closing signal to the solenoid valve, the solenoid valve drive unit is de-energized, the valve core closes, and one drainage cycle is completed. S5. Circulation: Repeat steps S2-S4 above, and condensate will be continuously discharged.

[0024] Beneficial effects of this invention: 1) The valve body and valve cover constitute the main body of the steam trap. In the initial stage, condensate enters the valve body cavity through the inlet pipe. The upper and lower electrode probes are located in the valve body cavity. The difference in conductivity between condensate and steam in the valve body cavity can be used as the detection basis. The dual electrode probes can accurately identify the medium state. The collected information can be transmitted to the signal acquisition module in the PLC control system through the upper and lower electrode shielded cables. Then, the PLC control system identifies and determines whether the solenoid valve needs to be opened, and then the condensate is discharged through the outlet pipe. The operation is convenient and more intelligent, avoiding the misjudgment caused by mechanical component wear and temperature interference of traditional steam traps. The condensate discharge accuracy rate is ≥98%.

[0025] 2) The PLC control system can realize automated control, expand remote communication function, support linkage with host computer, facilitate real-time monitoring of equipment operation status and remote adjustment of control parameters, eliminate the need for manual on-site operation, and reduce operation and maintenance costs.

[0026] 3) The solenoid valve, as an actuator, has a fast response speed of ≤0.1s. It can open in time when condensate accumulates to the set level and close quickly after discharge, effectively preventing steam leakage. The steam leakage rate is zero, which can significantly improve the thermal efficiency of steam traps compared to traditional steam traps. The solenoid valve is an electric actuator without mechanical wear, and there are no vulnerable parts such as floats and temperature sensing elements. The equipment has a low failure rate, long service life (designed service life ≥5 years), and strong adaptability to water quality. It can operate stably in condensate containing a small amount of impurities, making it safer and more reliable to use, reducing maintenance frequency, and fully ensuring the stable operation of the steam trap.

[0027] 4) The emptying valve is fixedly installed on the bottom surface of the water outlet pipeline and communicates with the inner cavity of the valve body. In the initial state, the non-condensed gas can be discharged, and the water hammer phenomenon can be prevented. If there is condensed water in the steam pipeline, the high-speed flowing steam will push the condensed water accumulated together to make the condensed water hit the pipeline wall, valve and steam using equipment, which is called water hammer. The phenomenon can cause damage or destruction of the pipeline bends and the valve, so the water outlet pipeline and the electromagnetic valve can be protected, the time life of the equipment can be prolonged, the heating efficiency of the inner cavity of the valve body can be ensured, and therefore, the safety and efficient operation of the steam system is very important. When the equipment is started for the first time, the electromagnetic valve is in a closed state. In order to ensure that the non-condensed gas entering the valve cavity is discharged in time without affecting the entry of the fluid, the bimetallic strip is in a cold flat state at this time, the emptying valve core is opened, and the non-condensed gas is discharged. When a large amount of hot condensed water and steam enters the valve cavity, the bimetallic strip is heated and expanded, pulling the emptying valve core to close, preventing the hot condensed water and steam from being discharged, and thus ensuring the normal operation of the intelligent drain valve.

[0028] 5) The siphon pipe is arranged at one end of the outlet end and extends to a position 10 mm above the bottom of the inner cavity of the valve body, so that the siphon effect is formed, the condensed water discharge speed is accelerated, the water conveying efficiency is improved, and the water seal is formed to prevent steam leakage.

[0029] 6) The blockage is arranged. When there are precipitated impurities on the bottom surface of the inner cavity of the valve body, the blockage can be opened to regularly disassemble and clean the deposited impurities on the bottom of the inner cavity of the valve body, so that the safe and stable operation of the equipment is ensured, the condensed water in the inner cavity of the valve body can be manually discharged, the normal operation of the steam drain valve is ensured, and the working condition is not affected.

[0030] 7) The filter screen assembly is installed on the pipeline of the inlet end and is made of 304 stainless steel. The filter screen aperture is 0.5 mm, and the filtering area is greater than or equal to 100 cm². The filter screen assembly can be disassembled and is convenient for regular cleaning or replacement. The iron rust and impurities in the steam water conveying system can be prevented from entering the valve body, so that the upper electrode probe and the lower electrode probe or the electromagnetic valve are prevented from being blocked, and the safe and stable operation of the equipment is comprehensively ensured.

[0031] 8) The drain valve has reasonable structure design, is easy to process, has low processing and manufacturing cost and is convenient to operate. The conductivity difference between the condensed water and the steam is utilized, the inner medium state of the cavity is detected in real time through the double-electrode probe, and the precise on-off control of the electromagnetic valve is realized in combination with the PLC control system, so that the condensed water can be precisely discharged in time, the steam waste is avoided, and the steam system operation efficiency is improved. The double-electrode arrangement position and the PLC control parameter can be adjusted according to the water discharge capacity of different steam systems and the cavity size. The drain valve is suitable for various industrial steam systems such as chemical industry, electric power, textile and food processing, has strong universality and wide application range. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 A structural diagram of the present application is shown in the figure; Figure 2 A side view of Figure 1 ; Figure 3 A structural diagram of the present application is shown in the figure; Figure 1 A structural diagram of the present application is shown in the figure; Figure 4 A structural diagram of the present application is shown in the figure; Figure 1 A structural diagram of the present application is shown in the figure; Figure 5 A control method block diagram of the present application is shown in the figure.

[0033] In the figure: valve body 1, valve body cavity 101, valve cover 2, inlet pipe 201, outlet pipe 202, inlet flange 203, outlet flange 204, filter screen assembly 3, solenoid valve 4, solenoid valve cable 401, valve core 402, PLC control system 5, emptying valve 6, emptying valve valve core 601, emptying valve valve seat 602, bimetallic strip 603, adjusting nut 604, sleeve 605, siphon 7, plug 8, upper electrode shield cable 901, lower electrode shield cable 902, upper electrode probe 10, lower electrode probe 11, bracket 12. DETAILED DESCRIPTION

[0034] Example 1. The present application will be further described below in conjunction with the accompanying drawings.

[0035] The present application includes valve body 1, valve body cavity 101, valve cover 2, inlet pipe 201, outlet pipe 202, inlet flange 203, outlet flange 204, solenoid valve 4, solenoid valve cable 401, valve core 402, PLC control system 5, emptying valve 6, siphon 7, upper electrode shield cable 901, lower electrode shield cable 902, upper electrode probe 10, lower electrode probe 11, bracket 12, and the specific structure includes valve body 1, which is provided with valve body cavity 101 inside, and valve cover 2 is fixedly installed on the surface of valve body 1, inlet flange 203 is fixedly installed on one side of valve cover 2, water inlet pipe 201 is arranged in inlet flange 203 and valve cover 2, and water inlet pipe 201 communicates with valve body cavity 101; outlet flange 204 is fixedly installed on the other side of valve cover 2, water outlet pipe 202 is arranged in outlet flange 204 and valve cover 2, and the end of water outlet pipe 202 is fixedly installed with solenoid valve 4, valve core 402 is arranged in solenoid valve 4, valve core 402 is located at the end of water outlet pipe 202, and solenoid valve 4 is fixedly installed on the surface of valve cover 2; solenoid valve cable 401 is fixedly installed on solenoid valve 4, and solenoid valve cable 401 is connected with the output module of PLC control system 5.

[0036] The PLC control system 5 is provided with a signal acquisition module, the signal acquisition module is connected with the upper electrode shield cable 901 and the lower electrode shield cable 902 respectively, the end of the upper electrode shield cable 901 and the lower electrode shield cable 902 is fixedly connected with the upper electrode probe 10 and the lower electrode probe 11 respectively, and the upper electrode probe 10 and the lower electrode probe 11 penetrate through the valve body 1 and are fixedly installed in the valve cavity 101.

[0037] The side wall of the valve body 1 is provided with two threaded holes which are vertically distributed, the upper electrode probe 10 and the lower electrode probe 11 are inserted into the threaded holes and fixedly installed, the lower electrode probe 11 is fixedly installed close to the bottom surface of the valve body 1, and the upper electrode probe 10 is fixedly installed above the lower electrode probe 11.

[0038] The bottom surface of the water outlet pipeline 202 is fixedly installed with the emptying valve 6, the emptying valve 6 penetrates through the valve cover 2 and extends into the valve cavity 101.

[0039] The emptying valve 6 comprises an emptying valve spool 601, an emptying valve valve seat 602, a bimetallic strip 603, an adjusting nut 604 and a sleeve 605, the emptying valve valve seat 602 is fixedly installed below the water outlet pipeline 202, the emptying valve spool 601 is installed in the emptying valve valve seat 602, the bottom surface of the emptying valve valve seat 602 is fixedly connected with the sleeve 605, and the adjusting nut 604 is arranged on the outer wall surface of the sleeve 605; the bimetallic strip 603 is fixedly installed on the outer wall surface of the sleeve 605 and is arranged above the adjusting nut 604.

[0040] The water outlet pipeline 202 is fixedly connected with the siphon pipe 7 through the communication pipe, and the siphon pipe 7 is arranged in the valve cavity 101.

[0041] The PLC control system 5 is fixedly installed on the surface of the valve cover 2 through the support 12.

[0042] The valve body 1 is forged by 304 stainless steel, and the valve cavity 101 is in a cylindrical shape.

[0043] The upper electrode probe 10 is made of a titanium alloy electrode with a diameter of 8 mm, the detection end has a length of 40 mm, the tail end of the upper electrode probe 10 is located at 70% of the height of the valve body 1, the gap between the upper electrode probe 10 and the valve body 1 is sealed by a polytetrafluoroethylene sealing ring, and the temperature resistance is 260 DEG C.

[0044] The lower electrode probe 11 is made of a titanium alloy electrode with a diameter of 8 mm, the detection end has a length of 40 mm, and the lower electrode probe 11 is horizontally installed on the side wall of the valve body 1 at 25% of the bottom, so that the lower electrode probe 11 can contact the condensed water as early as possible.

[0045] The upper electrode shielding cable 901 and the lower electrode shielding cable 902 are both RVVP2x0.75mm2 specifications, wrapped with a metal shielding net on the outer layer, 0.5m in length, connected with the upper electrode probe 10 and the lower electrode probe 11 through aviation plugs at one end, and connected with the signal acquisition module of the PLC control system 5 at the other end, effectively resisting electromagnetic interference in the industrial field.

[0046] The electromagnetic valve 4 is a DN20 normally closed stainless steel electromagnetic valve with a nominal pressure of 1.6MPa, a working temperature of-10℃~200℃, and a response time of≤0.15s, connected with the output module of the PLC control system 5 through the electromagnetic valve cable 401 (YJV2x1.0mm2), and the cable is protected by a galvanized pipe.

[0047] The siphon 7 is a φ20mm steel pipe installed 10mm above the bottom of the valve body inner cavity 101, forming a siphon effect to speed up the condensate water discharge speed, and forming a water seal to prevent steam leakage.

[0048] The bracket 12 is made of aluminum alloy steel and is shaped by cutting according to a parabola and an elliptical curve, fixed on the surface of the valve cover 2 at the bottom through bolts, and connected with the PLC control system 5 at the top through bolts, ensuring the stability and beauty of the overall structure.

[0049] The PLC control system 5 uses a Siemens S7-1214C PLC, equipped with a SM1231 analog input module (4 channels, 13-bit resolution) and a SM1223 digital output module (8 points, DC24V), installed in an IP54 protection level control cabinet.

[0050] The preset control program is: when the electrical conductivity detected by the upper electrode probe 10 and the lower electrode probe 11 is both >50μS / cm, a DC24V signal is output after a 2s delay to open the electromagnetic valve 4; when the electrical conductivity detected by the upper electrode probe 10 and the lower electrode probe 11 is both <5μS / cm, the output signal is immediately cut off to close the electromagnetic valve 4.

[0051] A control method of a double-electrode intelligent steam trap, the method comprising the following steps: S1. Initial state: the electromagnetic valve 4 is in a closed state, and the condensate water of the steam trap enters the valve body inner cavity 101 through the water inlet pipe 201; S2. Condensate water accumulation stage: as the condensate water continuously accumulates in the valve body inner cavity 101, the liquid level gradually rises, when the liquid level rises to the detection end of the lower electrode probe 11, the lower electrode probe 11 detects that the medium is condensate water, i.e. the electrical conductivity is greater than 50μS / cm, and transmits the signal to the PLC control system 5; the upper electrode probe 10 detects that the medium is steam, i.e. the electrical conductivity is 0μS / cm, the PLC control system 5 determines that the condensate water has not accumulated to the required discharge liquid level, and the electromagnetic valve 4 remains closed; S3. Condensate water discharge stage: when the condensate water continues to accumulate in the valve body cavity 101, the liquid level rises to the detection end of the upper electrode probe 10, the upper electrode probe 10 and the lower electrode probe 11 both detect that the medium is condensate water, that is, the conductivity is greater than 50 μS / cm, and the PLC control system 5 receives the signal, and outputs the electromagnetic valve 4 valve opening signal after program judgment, the electromagnetic valve 4 drive unit is powered on, the valve core is opened, and the condensate water is discharged in turn through the siphon pipe 7 and the water outlet pipe 202; S4. Valve closing stage: as the condensate water is discharged, the liquid level in the valve body cavity 101 gradually decreases, when the lower electrode probe 11 detects that the medium is steam, that is, the conductivity is 0 μS / cm, the PLC control system 5 determines that the condensate water has been discharged, outputs the electromagnetic valve 4 valve closing signal after program judgment, the electromagnetic valve 4 drive unit is powered off, the valve core is closed, and the discharge cycle is completed; S5. Cycle operation: repeat the above steps S2-S4, and the condensate water is continuously discharged.

[0052] Embodiment 2. The application comprises a valve body 1, a valve body cavity 101, a valve cover 2, an inlet pipe 201, an outlet pipe 202, an inlet flange 203, an outlet flange 204, a filter screen assembly 3, an electromagnetic valve 4, an electromagnetic valve cable 401, a valve core 402, a PLC control system 5, an emptying valve 6, an emptying valve core 601, an emptying valve seat 602, a bimetallic strip 603, an adjusting nut 604, a sleeve 605, a siphon pipe 7, a plug 8, an upper electrode shield cable 901, a lower electrode shield cable 902, an upper electrode probe 10, a lower electrode probe 11, and a bracket 12, and the specific structure comprises the valve body 1, the valve body 1 is provided with the valve body cavity 101, the surface of the valve body 1 is fixedly provided with the valve cover 2, one side of the valve cover 2 is fixedly provided with the inlet flange 203, the inlet flange 203 and the valve cover 2 are provided with the water inlet pipe 201, and the water inlet pipe 201 communicates with the valve body cavity 101; the other side of the valve cover 2 is fixedly provided with the outlet flange 204, the outlet flange 204 and the valve cover 2 are provided with the water outlet pipe 202, the end of the water outlet pipe 202 is fixedly provided with the electromagnetic valve 4, the electromagnetic valve 4 is provided with the valve core 402, the valve core 402 is located at the end of the water outlet pipe 202, and the electromagnetic valve 4 is fixedly installed on the surface of the valve cover 2; the electromagnetic valve 4 is fixedly provided with the electromagnetic valve cable 401, and the electromagnetic valve cable 401 is connected with the output module of the PLC control system 5.

[0053] The PLC control system 5 is provided with a signal acquisition module, the upper electrode shield cable 901 and the lower electrode shield cable 902 are respectively connected to the signal acquisition module, the ends of the upper electrode shield cable 901 and the lower electrode shield cable 902 are fixedly connected with the upper electrode probe 10 and the lower electrode probe 11, respectively, and the upper electrode probe 10 and the lower electrode probe 11 penetrate through the valve body 1 and are fixedly installed in the valve body cavity 101.

[0054] The side wall of the valve body 1 is provided with threaded holes, the number of which is two, vertically distributed, the upper electrode probe 10 and the lower electrode probe 11 are respectively inserted into the threaded holes and fixedly installed, the lower electrode probe 11 is fixedly installed close to the bottom surface of the valve body 1, and the upper electrode probe 10 is fixedly installed above the lower electrode probe 11.

[0055] The bottom surface of the water outlet pipeline 202 is fixedly installed with the emptying valve 6, the emptying valve 6 penetrates the valve cover 2 and extends into the valve inner cavity 101.

[0056] The emptying valve 6 comprises an emptying valve spool 601, an emptying valve valve seat 602, a bimetallic strip 603, an adjusting nut 604 and a sleeve 605, the emptying valve valve seat 602 is fixedly installed at a lower position of the water outlet pipeline 202, the emptying valve spool 601 is installed in the emptying valve valve seat 602, the bottom surface of the emptying valve valve seat 602 is fixedly connected with the sleeve 605, and the outer wall surface of the sleeve 605 is provided with the adjusting nut 604; the outer wall surface of the sleeve 605 is fixedly installed with the bimetallic strip 603, and the bimetallic strip 603 is arranged above the adjusting nut 604.

[0057] The water outlet pipeline 202 is fixedly connected with the siphon 7 through a communication pipe, and the siphon 7 is arranged in the valve inner cavity 101.

[0058] The PLC control system 5 is fixedly installed on the surface of the valve cover 2 through the support 12.

[0059] The side wall of the valve body 1 is fixedly installed with the plug 8, and the plug 8 is arranged close to the lower end surface of the valve inner cavity 101; and the end portion of the water inlet pipeline 201 is fixedly installed with the filter screen assembly 3.

[0060] The valve body 1 is forged by 304 stainless steel, and the valve inner cavity 101 is in a cylindrical shape.

[0061] The upper electrode probe 10 is made of a titanium alloy electrode with a diameter of φ8 mm, the detection end has a length of 40 mm, the tail end of the upper electrode probe 10 is located at 70% of the height of the valve body 1, the gap between the upper electrode probe 10 and the valve body 1 is sealed by a polytetrafluoroethylene sealing ring, and the temperature resistance is 260 DEG C.

[0062] The lower electrode probe 11 is made of a titanium alloy electrode with a diameter of φ8 mm, the detection end has a length of 40 mm, and the lower electrode probe 11 is horizontally installed at a position 25% away from the bottom of the side wall of the valve body 1, so that the lower electrode probe 11 can be ensured to contact the condensed water earliest.

[0063] The upper electrode shielding cable 901 and the lower electrode shielding cable 902 are both RVVP2x0.75mm2 specifications, wrapped with a metal shielding net on the outer layer, 0.5m in length, connected with the upper electrode probe 10 and the lower electrode probe 11 through aviation plugs at one end, and connected with the signal acquisition module of the PLC control system 5 at the other end, effectively resisting electromagnetic interference in the industrial field.

[0064] The electromagnetic valve 4 is a DN20 normally closed stainless steel electromagnetic valve with a nominal pressure of 1.6MPa, a working temperature of-10℃~200℃, and a response time of≤0.15s, connected with the output module of the PLC control system 5 through the electromagnetic valve cable 401 (YJV2x1.0mm2), and the cable is protected by a galvanized pipe.

[0065] The siphon 7 is a φ20mm steel pipe installed 10mm above the bottom of the valve body inner cavity 101 to form a siphon effect and accelerate the condensate water discharge speed.

[0066] The bracket 12 is made of aluminum alloy steel and is shaped by cutting according to a parabola and an elliptical curve, fixed on the surface of the valve cover 2 at the bottom through bolts, and connected with the PLC control system 5 at the top through bolts, ensuring the stability and beauty of the overall structure.

[0067] The PLC control system 5 is a Siemens S7-1214C PLC equipped with an SM1231 analog input module (4 channels, 13-bit resolution) and an SM1223 digital output module (8 points, DC24V), installed in an IP54 protection level control cabinet.

[0068] The preset control program is: when the conductivity detected by the upper electrode probe 10 and the lower electrode probe 11 is both >50μS / cm, a DC24V signal is output after a 2s delay to open the electromagnetic valve 4; when the conductivity detected by the upper electrode probe 10 and the lower electrode probe 11 is both <5μS / cm, the output signal is immediately cut off to close the electromagnetic valve 4.

[0069] A control method of a double-electrode intelligent steam trap, the method comprising the following steps: S1. Initial state: the electromagnetic valve 4 is in a closed state, and the condensate water of the steam trap enters the valve body inner cavity 101 through the water inlet pipe 201; S2. Condensate water accumulation stage: as the condensate water continuously accumulates in the valve body inner cavity 101, the liquid level gradually rises, when the liquid level rises to the detection end of the lower electrode probe 11, the lower electrode probe 11 detects that the medium is condensate water, i.e. the conductivity is greater than 50μS / cm, and transmits the signal to the PLC control system 5; the upper electrode probe 10 detects that the medium is steam, i.e. the conductivity is 0μS / cm, the PLC control system 5 determines that the condensate water has not accumulated to the required discharge liquid level, and the electromagnetic valve 4 remains closed; S3. Condensate water discharge stage: when the condensate water continues to accumulate in the valve body cavity 101, the liquid level rises to the detection end of the upper electrode probe 10, the upper electrode probe 10 and the lower electrode probe 11 both detect that the medium is condensate water, that is, the conductivity is greater than 50 μS / cm, the PLC control system 5 receives the signal, and outputs the electromagnetic valve 4 valve opening signal through the program judgment, the electromagnetic valve 4 drive unit is powered on, the valve core is opened, and the condensate water is discharged in turn through the siphon pipe 7 and the water outlet pipe 202; S4. Valve closing stage: as the condensate water is discharged, the liquid level in the valve body cavity 101 gradually decreases, when the lower electrode probe 11 detects that the medium is steam, that is, the conductivity is 0 μS / cm, the PLC control system 5 determines that the condensate water has been discharged, outputs the electromagnetic valve 4 valve closing signal through the program judgment, the electromagnetic valve 4 drive unit is powered off, the valve core is closed, and the drainage cycle is completed; S5. Cycle operation: repeat the above steps S2-S4, and the condensate water is continuously discharged.

[0070] The plug 8 is provided, when there are precipitated impurities on the bottom surface of the valve body cavity 101, the plug 8 can be opened, the bottom deposited impurities of the valve body cavity 101 can be periodically disassembled and cleaned, the safe and stable operation of the equipment is ensured, at the same time, the condensate water in the valve body cavity 101 can be manually discharged, the normal operation of the steam trap is ensured, and the working condition is not affected.

[0071] The filter screen assembly 3 is provided, installed on the pipeline of the inlet end 201, made of 304 stainless steel, with a filter screen aperture of 0.5 mm and a filter area of ≥100 cm², which can be disassembled and cleaned or replaced regularly, prevents rust and impurities in the steam water conveying system from entering the valve body 1, avoids blocking the upper electrode probe 10 and the lower electrode probe 11 or the electromagnetic valve 4, and fully ensures the safe and stable operation of the equipment. When the filter screen assembly 3 is blocked, causing abnormal pressure of the inlet pipeline 201 or the electromagnetic valve 4 fails to close, the PLC control system 5 can trigger an alarm through the extended pressure sensor signal, that is, the control cabinet indicator light flashes, at this time, the inlet valve can be closed for maintenance.

Claims

1. A two electrode smart steam trap, characterized by: The utility model provides a kind of valve, including valve body (1), and the surface of valve body (1) is fixedly installed with valve cover (2), one side of valve cover (2) is fixedly installed with inlet flange (203), and inlet flange (203) is provided with water inlet pipeline (201) in valve cover (2), and water inlet pipeline (201) is communicated with valve body cavity (101);The other side of valve cover (2) is fixedly installed with outlet flange (204), and outlet flange (204) is provided with water outlet pipeline (202) in valve cover (2), and the end of water outlet pipeline (202) is fixedly installed with solenoid valve (4), and solenoid valve (4) is provided with valve core (402), and valve core (402) is located in the end of water outlet pipeline (202), and solenoid valve (4) is fixedly installed on the surface of valve cover (2);Solenoid valve cable (401) is fixedly installed on solenoid valve (4), and solenoid valve cable (401) is connected with the output module of PLC control system (5).

2. A dual electrode smart steam trap valve as claimed in claim 1, wherein: The PLC control system (5) is provided with a signal acquisition module, and the signal acquisition module is respectively connected with an upper electrode shield cable (901) and a lower electrode shield cable (902). The ends of the upper electrode shield cable (901) and the lower electrode shield cable (902) are respectively fixedly connected with an upper electrode probe (10) and a lower electrode probe (11). The upper electrode probe (10) and the lower electrode probe (11) penetrate through the valve body (1) and are fixedly installed in the valve body cavity (101).

3. A dual electrode smart steam trap valve as claimed in claim 2, wherein: The side wall of the valve body (1) is provided with two threaded holes which are vertically distributed. The upper electrode probe (10) and the lower electrode probe (11) are respectively inserted into the threaded holes and fixedly installed. The lower electrode probe (11) is fixedly installed close to the bottom surface of the valve body (1). The upper electrode probe (10) is fixedly installed above the lower electrode probe (11).

4. A dual electrode smart steam trap valve as claimed in claim 3, wherein: The bottom surface of the water outlet pipeline (202) is fixedly installed with an emptying valve (6). The emptying valve (6) penetrates through the valve cover (2) and extends into the valve body cavity (101).

5. A dual electrode smart steam trap valve as claimed in claim 4, wherein: The emptying valve (6) includes an emptying valve core (601), an emptying valve seat (602), a bimetallic strip (603), an adjusting nut (604) and a sleeve (605). The emptying valve seat (602) is fixedly installed below the water outlet pipeline (202). The emptying valve core (601) is installed in the emptying valve seat (602). The bottom surface of the emptying valve seat (602) is fixedly connected with the sleeve (605). The adjusting nut (604) is arranged on the outer wall surface of the sleeve (605). The bimetallic strip (603) is fixedly installed on the outer wall surface of the sleeve (605) and is arranged above the adjusting nut (604).

6. A dual electrode smart steam trap valve as claimed in claim 5, wherein: The water outlet pipeline (202) is fixedly connected with a siphon pipe (7) through a communication pipe. The siphon pipe (7) is arranged in the valve body cavity (101).

7. A dual electrode smart steam trap valve as claimed in claim 6, wherein: The side wall of the valve body (1) is fixedly installed with a plug (8) close to the lower end surface of the valve body cavity (101). The end of the water inlet pipeline (201) is fixedly installed with a filter screen assembly (3).

8. A dual electrode smart steam trap valve as claimed in claim 7, wherein: The PLC control system (5) is fixedly installed on the surface of the valve cover (2) through the support (12).

9. The control method of a dual electrode smart steam trap valve according to claim 8, characterized in that: The method comprises the following steps: S1. Initial state: the electromagnetic valve (4) is in a closed state, and the condensate of the steam trap enters the inner cavity (101) of the valve body through the water inlet pipeline (201); S2. Condensate accumulation stage: as the condensate continuously accumulates in the inner cavity (101) of the valve body, the liquid level gradually rises, when the liquid level rises to the detection end of the lower electrode probe (11), the lower electrode probe (11) detects that the medium is condensate, that is, the conductivity is greater than 50 μS / cm, and transmits the signal to the PLC control system (5); the upper electrode probe (10) detects that the medium is steam, that is, the conductivity is 0 μS / cm, the PLC control system (5) determines that the condensate has not accumulated to the liquid level that needs to be discharged, and the electromagnetic valve (4) remains closed; S3. Condensate discharge stage: when the condensate continues to accumulate in the inner cavity (101) of the valve body, the liquid level rises to the detection end of the upper electrode probe (10), the upper electrode probe (10) and the lower electrode probe (11) both detect that the medium is condensate, that is, the conductivity is greater than 50 μS / cm, after the PLC control system (5) receives the signal, the program judges to output the electromagnetic valve 4 valve opening signal, the electromagnetic valve (4) drive unit is powered on, the valve core is opened, and the condensate is discharged through the siphon pipe (7) and the water outlet pipeline (202) in turn; S4. Valve closing stage: as the condensate is discharged, the liquid level in the inner cavity (101) of the valve body gradually decreases, when the lower electrode probe (11) detects that the medium is steam, that is, the conductivity is 0 μS / cm, the PLC control system (5) determines that the condensate has been discharged, the program judges to output the electromagnetic valve (4) valve closing signal, the electromagnetic valve (4) drive unit is powered off, the valve core is closed, and a drainage cycle is completed; S5. Cycle operation: repeat the above steps S2-S4, and the condensate is continuously discharged.

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