Stop valve and process for preventing crystallization blockage in synthesis of m-nitrobenzotrifluoride

Abstract

The invention relates to the field of stop valves, in particular to a stop valve and process for preventing crystallization blockage in m-nitrobenzotrifluoride synthesis, the stop valve comprises a valve body, an opening and closing assembly is arranged in the valve body, an anti-blocking assembly is arranged on one side in the stop valve, and temperature control assemblies are arranged on the two sides of the upper portion of the stop valve; the opening and closing assembly is used for controlling opening and closing of the stop valve. The anti-blocking assembly is used for preventing the interior of the stop valve from being blocked. The temperature control assembly is used for guaranteeing the continuous working performance of the stop valve; the opening and closing assembly comprises a valve rod, the bottom of the valve rod is rotationally connected with a rotating sleeve, the bottom of the rotating sleeve is fixedly connected with a sealing plate, and the bottom of the sealing plate is fixedly connected with a rotating stand. And the system stability and the production efficiency are obviously improved.

Description

Technical Field

[0001] The present invention relates to the field of globe valves, and in particular to a globe valve and process for preventing crystallization and blockage in the synthesis of m-nitrobenzotrifluoride. Background Art

[0002] In the synthesis and transportation process of m-nitrobenzotrifluoride, its melting point is -5°C, and it is easy to crystallize at low temperatures or when stagnant, posing serious technical challenges to traditional globe valves: First, crystallization is likely to adhere to parts such as the connecting ports of the middle partition and the flow channel in the valve. Traditional valves lack a dynamic cleaning mechanism, are prone to blockage and jamming, and require frequent shutdowns for cleaning, affecting production continuity; Second, traditional heat medium insulation processes mostly adopt a continuous heating mode, with high energy consumption and a lag in temperature control, unable to adjust dynamically according to the ambient temperature, which may affect the medium characteristics due to insufficient or excessive heating; Third, large crystal clusters generated at low temperatures during the transportation process flowing into the valve are likely to impact components such as the sealing plate, causing mechanical wear. Traditional filtering devices can only intercept impurities, cannot break crystals, and require manual cleaning at regular intervals. Due to the lack of a collaborative system in the prior art, it is difficult to balance process continuity and safety. Therefore, we propose a globe valve and process for preventing crystallization and blockage in the synthesis of m-nitrobenzotrifluoride to solve the above-mentioned problems. Summary of the Invention

[0003] The purpose of the present invention is to solve the drawbacks in the background art, and to propose a globe valve and process for preventing crystallization and blockage in the synthesis of m-nitrobenzotrifluoride.

[0004] To achieve the above object, the technical solution adopted by the present invention is: A globe valve for preventing crystallization and blockage in the synthesis of m-nitrobenzotrifluoride, including a globe valve, the globe valve includes a valve body, an opening and closing assembly is arranged inside the valve body, an anti-blocking assembly is arranged on one side inside the globe valve, and temperature control assemblies are arranged on both sides of the upper part of the globe valve;

[0005] The opening and closing assembly is used to control the opening and closing of the globe valve;

[0006] The anti-blocking assembly is used to prevent blockage inside the globe valve;

[0007] The temperature control assembly is used to ensure the continuous working performance of the globe valve;

[0008] The opening and closing assembly includes a valve stem. A rotating sleeve is rotatably connected to the bottom of the valve stem. A sealing plate is fixedly connected to the bottom of the rotating sleeve. A rotating frame is fixedly connected to the bottom of the sealing plate. The sealing plate, the rotating frame and the rotating sleeve are all arranged inside the valve body. A valve cover is installed on the top of the valve body. Mounting rods are installed on both sides of the top of the valve cover. A threaded plate is installed on the top of the valve cover through the mounting rods. A threaded section is arranged in the middle and upper part of the outer periphery of the valve stem. The valve stem is threadedly connected to the threaded plate through the threaded section. A handwheel is installed on the top of the valve stem. A feed port is arranged on one side of the valve body. A discharge port is arranged on the other side of the valve body.

[0009] Preferably, the temperature control assembly includes two connecting pipes. The connecting pipes are fixedly connected to both sides of the top of the valve body. A cavity is arranged in the middle of the valve body wall. Guide pipes are fixedly connected to the middle of both sides of the outer periphery of the connecting pipes. The ends of the guide pipes away from the connecting pipes are all communicated with the cavity.

[0010] Preferably, the anti-blocking assembly includes an inner heat ring I and an inner heat ring II. The inner heat ring I is installed on one side of the inside of the valve body close to the feed port. The inner heat ring II is installed on one side of the inside of the valve body close to the discharge port. The tops of the inner heat ring I and the inner heat ring II are both communicated with the inner bottom of the connecting pipe. Circulation interfaces are installed at the bottoms of the inner heat ring I and the inner heat ring II. The bottoms of the circulation interfaces all penetrate through the bottom wall of the valve body. A fixing ring is arranged inside the inner heat ring I. A blocking frame is fixedly connected to the middle of the outer periphery of the fixing ring. The blocking frame is installed between the fixing ring and the inner heat ring I. A rotating ring is rotatably connected to the inside of the fixing ring. Uniformly distributed inclined guide vanes are fixedly connected to the inside of the rotating ring.

[0011] Preferably, a middle partition plate is fixedly connected to the middle of the inside of the valve body. A connection port is arranged in the middle of the middle partition plate. A liquid inlet cavity communicated with the feed port is arranged at the lower part of the middle partition plate. A liquid outlet cavity communicated with the discharge port is arranged at the upper part of the middle partition plate.

[0012] Preferably, fixing frames are fixedly connected to the upper parts of the inside of the connecting pipes. Slide pipes are fixedly connected to the bottoms of the fixing frames. Fixing disks are installed at the middle and lower parts of the inside of the connecting pipes through the slide pipes.

[0013] Preferably, uniformly distributed openings are formed in the middle and lower parts of the outer peripheries of the slide pipes. Through holes are formed in the bottoms of the fixing disks. Sliding plugging blocks are sleeved on the middle and lower parts of the outer peripheries of the slide pipes. The bottoms of the sliding plugging blocks are installed on the tops of the fixing disks. The sliding ends of the tops of the sliding plugging blocks are slidably connected to the slide pipes.

[0014] Preferably, a fixing spring is sleeved on the upper part of the outer periphery of the sliding pipe. The fixing springs are arranged between the fixing frame and the sliding plugging block. The lower parts of the front and rear sides of the outer periphery of the sliding plugging block are fixedly connected with through pipes. The ends of the through pipes far away from the sliding plugging block are fixedly connected with storage pipes. The outer peripheries of the storage pipes are fixedly connected with evenly distributed heat conduction fins. Heat-sensitive substances are arranged inside the storage pipes.

[0015] Preferably, both ends of the outer periphery of the rotating ring are fixedly connected with evenly distributed first fixing rods. One sides of the first fixing rods are fixedly connected with second fixing rods. The ends of the second fixing rods far away from the first fixing rods are fixedly connected with rotating plates.

[0016] Preferably, the outer edges of the rotating plates are rotatably connected to the inner side of the first internal heat ring. Evenly distributed heat conduction sheets are fixedly connected to both the inner sides of the first internal heat ring and the second internal heat ring. The inner ends of the rotating plates are fixedly connected with dial blocks.

[0017] Preferably, a process for preventing crystallization blockage in the synthesis of m-nitrobenzotrifluoride includes the following operation steps:

[0018] S1. Preparation stage

[0019] S1.1. Installation and connection

[0020] ①. Connect the stop valve to the m-nitrobenzotrifluoride conveying pipeline through the feed port and the discharge port, ensure good sealing and avoid leakage;

[0021] ②. Connect an external heat medium source through a connecting pipe, and connect the circulation interface to the heat medium circulation system;

[0022] S1.2. Inspection and debugging

[0023] ①. Manual opening and closing test: Rotate the handwheel and observe whether the valve stem and the sealing plate rise and fall smoothly, ensure that the sealing plate fits tightly with the middle partition plate and there is no jamming;

[0024] ②. Heat medium circulation test:

[0025] 1). In the initial state, the sliding plugging block should block the conduit and the heat medium does not flow;

[0026] 2). Simulate a low-temperature environment and observe whether the sliding plugging block gradually opens the conduit according to the characteristic of "the lower the temperature, the faster the contraction", the heat medium is preheated at a low speed first, then heated up rapidly, and finally automatically closes after the temperature reaches the standard;

[0027] 3). Check the function of the blocking frame: Manually rotate the rotating ring and confirm that the rotating plate and the dial block can drive the blocking frame to vibrate without jamming;

[0028] S2. Startup stage

[0029] S2.1. Preheating and heat preservation

[0030] ①. When the external temperature is lower than the melting point of m-nitrobenzotrifluoride, the thermosensitive substance senses the low temperature through the heat conduction fins, contracts and then opens the conduit, and the heat medium enters the cavity and the inner heat ring I according to the process of "slow first and then fast":

[0031] ②. Low-speed preheating: The initial heat medium flow rate is small, and it circulates slowly through the circulation interface to raise the valve body temperature to about 5°C;

[0032] ③. Rapid temperature rise: When the thermosensitive substance further contracts and the conduit is fully opened, the heat medium circulates at full speed to maintain the valve body temperature at 10°C - 20°C;

[0033] ④. After the temperature stabilizes, proceed to the next operation;

[0034] S2.2. Open the stop valve

[0035] ①. Slowly rotate the handwheel clockwise, and drive the sealing plate to rise through the cooperation of the threaded section of the valve stem and the threaded plate:

[0036] ②. During the rising process, the sealing plate drives the rotating frame to rotate synchronously through the friction of the rotating sleeve, and initially cleans the connection port of the middle partition plate to remove possible crystal residues;

[0037] ③. When there is a gap between the sealing plate and the middle partition plate, the liquid inlet cavity is connected to the liquid outlet cavity, the stop valve is opened, and the transportation of m-nitrobenzotrifluoride begins;

[0038] S3. Operation stage

[0039] S3.1. Normal transportation monitoring

[0040] ①. Temperature monitoring: Continuously monitor the valve body temperature to ensure it is maintained at 10°C - 20°C; if the temperature drops to close to 5°C, check whether the heat medium circulation is abnormal and troubleshoot in time;

[0041] ②. Crystal cleaning:

[0042] 1). During the transportation process, the flowing medium impacts the rotating frame, causing it to rotate continuously, dynamically cleaning the connection port of the middle partition plate to prevent crystal accumulation;

[0043] 2). The blocking frame at the feed port intercepts large crystals. At the same time, the medium impacts the guide vane to drive the rotating ring to rotate, and the blocking frame is vibrated through the rotating plate and the dial block to break up the crystal clusters and prevent solidification;

[0044] 3). Pressure monitoring: Observe the pipeline pressure gauge. If the pressure rises abnormally, immediately check whether the inside of the valve body or the upstream filter needs to be cleaned;

[0045] S3.2. Intelligent control of heat medium circulation

[0046] ①. The system automatically adjusts the heat medium flow rate according to the valve body temperature:

[0047] ②. When the temperature reaches the standard, the thermal-sensitive substance expands to push the sliding sealing block to reset, sealing the catheter, and the circulation of the heat medium pauses, saving energy consumption.

[0048] ③. When the temperature drops again, the "preheating - heating - pausing" process is automatically repeated to maintain a constant temperature.

[0049] S4. Stop stage

[0050] S4.1. Close the stop valve

[0051] ①. Slowly rotate the handwheel counterclockwise to drive the sealing plate to descend until it completely fits the middle partition board, blocking the liquid inlet cavity and the liquid outlet cavity and stopping the transportation.

[0052] ②. During the closing process, the rotating frame rotates synchronously with the sealing plate to clean the connection port again to avoid residual medium crystallization adhesion.

[0053] S4.2. Heat medium circulation treatment

[0054] ①. If restarting within a short time, keep the heat medium circulation system on standby; if shutting down for a long time:

[0055] ②. Close the external heat medium source, drain the residual medium in the cavity body, inner heat ring 1 and inner heat ring 2 to prevent condensation and crystallization.

[0056] ③. Manually clean the residual crystals on the surface of the blocking rack to avoid affecting the next startup after solidification.

[0057] S5. Maintenance and repair

[0058] S5.1 Regular inspection

[0059] Weekly: Disassemble the handwheel assembly at the top of the valve body, check the wear of the valve stem and the threaded plate, and apply lubricating grease to prevent jamming.

[0060] Monthly: Clean the upstream filter, remove impurities and crystallization nuclei, check the rotation flexibility of the rotating frame and the rotating ring, and replace the worn dial block or guide vane.

[0061] Quarterly: Conduct a pressure test on the insulation jacket to ensure no leakage of the heat medium; detect the performance of the thermal-sensitive substance, and replace the storage tube assembly in time if it fails.

[0062] S5.2. Abnormality handling

[0063] If crystallization blockage occurs, it can be dredged by the following methods:

[0064] ①. Temporarily raise the temperature of the heat medium to 30°C - 40°C, melt the crystals and then clean them.

[0065] ②. Disassemble the valve body, manually remove the crystals on the middle partition and the blocking frame, and check whether the sealing surface of the sealing plate is damaged.

[0066] Compared with the prior art, the present invention has the following beneficial effects:

[0067] 1. The present invention adopts the friction linkage design of the rotating sleeve and the valve stem. When the valve is opened, the sealing plate and the rotating frame rotate and rise synchronously, and the middle partition plate connection port is initially rotated and cleaned to break the possible crystal adhesion; after the valve is opened, the flow of m-nitrotrifluorotoluene is used to impact the rotating frame to make it rotate continuously, forming a dynamic flushing effect, and clearing the crystal particles or attached residues at the connection port in real time. This mechanism does not require an additional power source, and uses the valve opening and closing action and the kinetic energy of the medium flow to achieve "transportation and cleaning", avoiding valve jamming or pipeline blockage caused by crystal accumulation. It is particularly suitable for high-frequency opening and closing or continuous transportation of easy-to-crystallize media, and significantly improves system stability and production efficiency.

[0068] 2. Adaptive regulation of heat medium circulation is achieved through the temperature control system that links the temperature-conducting fins with the heat-sensitive material: Under low temperature conditions, the "cold shrinkage" characteristics of the heat-sensitive material trigger the sliding blocking block to gradually open the conduit. The heat medium first preheats the valve body at a low flow rate (to avoid sudden changes in temperature difference), and then circulates at full speed to heat up after the temperature is initially increased. When the valve body temperature reaches the standard (10℃-20℃), the expansion of the heat-sensitive material pushes the blocking block to reset, automatically cutting off the flow of the heat medium, accurately matching the energy-saving requirements of "slow first, then fast, and stop when heating is completed". Compared with the traditional continuous heating mode, it can reduce a lot of energy consumption, while avoiding the influence of high temperature on the characteristics of the medium, ensuring that the valve can quickly enter the working state at different ambient temperatures, and reducing the cost of manual intervention.

[0069] 3. The intercepting frame on the inner side of the feed inlet intercepts the large crystal clusters produced during the synthesis process in advance to prevent hard crystals from impacting the sealing plate, rotating frame and other moving parts, reducing the risk of mechanical wear; the medium flow impacts the guide vane to drive the rotating ring to rotate, and the rotating plate is linked to the fixed rod to make the end block continuously hit the intercepting frame, generating a high-frequency vibration effect, shattering the intercepted crystal clusters and preventing them from solidifying and accumulating on the surface of the intercepting frame. At the same time, the hot medium is introduced into the inner heat ring through the port to locally heat the inside of the valve body and accelerate the melting of residual crystals, forming a triple protection system of "interception-crushing-heating", which not only protects the core components of the valve, but also reduces the probability of upstream crystals entering the conveying pipeline, and improves the overall anti-blocking ability of the system, which is especially suitable for synthetic process scenarios with complex crystal particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] Figure 1 It is a front view stereoscopic schematic diagram of a stop valve and process for preventing crystallization blockage in the synthesis of m-nitrotrifluorotoluene according to the present invention;

[0071] Figure 2A schematic diagram of the internal structure of a stop valve and process for preventing crystallization and clogging in the synthesis of m-nitrotrifluorotoluene according to the present invention;

[0072] Figure 3 It is a schematic diagram of the partial structure of a stop valve and a sealing plate of a process for preventing crystallization and clogging in the synthesis of meta-nitrotrifluorotoluene according to the present invention;

[0073] Figure 4 It is a schematic diagram of the local structure in the connecting pipe of a stop valve and a process for preventing crystallization blockage in the synthesis of m-nitrotrifluorotoluene according to the present invention;

[0074] Figure 5 It is a schematic diagram of the local structure of a stop valve and a sliding pipe of a process for preventing crystallization and clogging in the synthesis of meta-nitrotrifluorotoluene according to the present invention;

[0075] Figure 6 It is a partial structural schematic diagram of a stop valve for preventing crystallization blockage in the synthesis of meta-nitrotrifluorotoluene and a part of an inner heat ring of the process of the present invention;

[0076] Figure 7 It is a schematic diagram of the local structure of a stop valve and a blocking frame of a process for preventing crystallization and clogging in the synthesis of meta-nitrotrifluorotoluene according to the present invention;

[0077] Figure 8 The present invention is a schematic diagram of the local structure of a stop valve for preventing crystallization and blockage in the synthesis of meta-nitrotrifluorotoluene and a transfer plate of the process.

[0078] 1. Stop valve; 101. Valve body; 102. Feed inlet; 103. Discharge outlet; 104. Connecting pipe; 105. Conduit; 106. Thermal fin; 107. Circulation interface; 108. Valve cover; 109. Hand wheel; 110. Valve stem; 111. Threaded plate; 112. Through pipe; 113. Mounting rod; 114. Cavity; 115. Internal heat ring 1; 116. Middle partition; 117. Closing plate; 118. Rotating frame; 119. Rotating sleeve ; 120, liquid outlet cavity; 121, inner heat ring 2; 122, liquid inlet cavity; 123, sliding blocking block; 124, fixed disk; 125, storage tube; 126, fixing spring; 127, shift block; 128, opening; 129, sliding tube; 130, through-port; 131, blocking frame; 132, rotating ring; 133, fixing rod 1; 134, heat conducting plate; 135, fixing ring; 136, rotating plate; 137, fixing rod 2; 138, guide plate. DETAILED DESCRIPTION

[0079] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0080] like Figures 1-8A globe valve for preventing crystallization blockage in the synthesis of m-nitrobenzotrifluoride, as shown, includes a globe valve 1. The globe valve 1 includes a valve body 101. An opening and closing assembly is arranged inside the valve body 101. An anti-blocking assembly is arranged on one side inside the globe valve 1. Temperature control assemblies are arranged on both sides of the upper part of the globe valve 1;

[0081] The opening and closing assembly is used to control the opening and closing of the globe valve 1;

[0082] The anti-blocking assembly is used to prevent blockage inside the globe valve 1;

[0083] The temperature control assemblies are used to ensure the continuous working performance of the globe valve 1;

[0084] The opening and closing assembly includes a valve stem 110. A rotating sleeve 119 is rotatably connected to the bottom of the valve stem 110. A sealing plate 117 is fixedly connected to the bottom of the rotating sleeve 119. A rotating frame 118 is fixedly connected to the bottom of the sealing plate 117. The sealing plate 117, the rotating frame 118 and the rotating sleeve 119 are all arranged inside the valve body 101. A valve cover 108 is installed on the top of the valve body 101. Mounting rods 113 are installed on both sides of the top of the valve cover 108. A threaded plate 111 is installed on the top of the valve cover 108 through the mounting rods 113. A threaded section is arranged in the middle and upper part of the outer circumference of the valve stem 110. The valve stem 110 is threadedly connected to the threaded plate 111 through the threaded section. A handwheel 109 is installed on the top of the valve stem 110. A feed port 102 is arranged on one side of the valve body 101. A discharge port 103 is arranged on the other side of the valve body 101. A middle partition plate 116 is fixedly connected to the middle part inside the valve body 101. A connection port is arranged in the middle of the middle partition plate 116. A liquid inlet cavity 122 communicating with the feed port 102 is arranged below the middle partition plate 116. A liquid outlet cavity 120 communicating with the discharge port 103 is arranged above the middle partition plate 116;

[0085] Further, in specific implementation, when transporting m-nitrobenzotrifluoride, people can connect the conveying pipeline through the stop valve 1, so as to control the opening and closing of the conveying work. People can drive the valve stem 110 to rotate by rotating the handwheel 109. Then, through the cooperation between the threaded section on the valve stem 110 and the threaded plate 111, the valve stem 110 and the bottom sealing plate 117 can be driven to lift. When the valve stem 110 and the sealing plate 117 rise, a gap appears between the sealing plate 117 and the middle partition plate 116, so that the liquid inlet chamber 122 is connected to the liquid outlet chamber 120. At this time, the stop valve 1 is in the open state. When the valve stem 110 and the sealing plate 117 descend, the middle part of the middle partition plate 116 can be closed by the sealing plate 117, so as to block the liquid inlet chamber 122 and the liquid outlet chamber 120, realize the closing of the stop valve 1, and stop the conveying work. In the actual conveying process, when opening the sealing plate 117, the friction force between the rotating sleeve 119 and the valve stem 110 can drive the sealing plate 117 and the rotating frame 118 to rotate and rise synchronously, so that at the beginning of conveying, the connecting port in the middle of the middle partition plate 116 can be rotated and cleaned by the rotating frame 118, making the subsequent conveying smooth. Then, when m-nitrobenzotrifluoride is normally conveyed, the continuous m-nitrobenzotrifluoride will impact the rotating frame 118, drive the rotating frame 118 and the sealing plate 117 to rotate, and realize the continuous cleaning of the connecting port in the middle of the middle partition plate 116, avoiding partial crystallization from getting stuck in the connecting port in the middle of the middle partition plate 116 and causing blockage, which is beneficial to the continuous conveying work in the synthesis process of m-nitrobenzotrifluoride.

[0086] Among them, the temperature control component includes two connecting pipes 104. The connecting pipes 104 are fixedly connected to both sides of the top of the valve body 101. A cavity 114 is arranged in the middle of the wall of the valve body 101. On both sides of the middle of the outer periphery of the connecting pipe 104, a conduit 105 is fixedly connected. One end of the conduit 105 away from the connecting pipe 104 is connected to the cavity 114. At the upper part of the connecting pipe 104, a fixing frame 139 is fixedly connected. At the bottom of the fixing frame 139, a sliding pipe 129 is fixedly connected. At the bottom of the sliding pipe 129, a fixing disk 124 is fixedly connected. The fixing disks 124 are all installed in the middle and lower parts of the connecting pipe 104. At the middle and lower parts of the outer periphery of the sliding pipe 129, uniformly distributed openings 128 are opened. At the bottom of the fixing disk 124, a through hole 130 is opened. A sliding plugging block 123 is sleeved on the middle and lower parts of the outer periphery of the sliding pipe 129. The bottom of the sliding plugging block 123 is installed on the top of the fixing disk 124. The sliding end at the top of the sliding plugging block 123 is slidably connected to the sliding pipe 129. A fixing spring 126 is sleeved on the upper part of the outer periphery of the sliding pipe 129. The fixing springs 126 are all arranged between the fixing frame 139 and the sliding plugging block 123. On the front and rear sides of the lower part of the outer periphery of the sliding plugging block 123, a through pipe 112 is fixedly connected. One end of the through pipe 112 away from the sliding plugging block 123 is fixedly connected to a storage pipe 125. On the outer periphery of the storage pipe 125, uniformly distributed heat conduction fins 106 are fixedly connected. A heat-sensitive substance is arranged inside each storage pipe 125;

[0087] Furthermore, during specific implementation, before transportation, people can connect an external heat medium source through the connecting pipe 104, so as to input the heat medium into the cavity 114. The circulation of the heat medium can be realized through the circulation interface 107. The sliding plugging block 123 inside the connecting pipe 104 can be used to block the conduit 105, so as to block the connection of the connecting pipe 104 when the normal stop valve 1 is not working or the temperature is relatively high. The conduction of the external temperature can be realized through the temperature conduction fin 106, so as to effectively reduce unnecessary losses and investments. When the external environmental temperature is relatively low, the temperature will be timely transferred to the inside of the storage pipe 125 through the conduction of the temperature conduction fin 106, so that the heat-sensitive substance inside the storage pipe 125 can be timely subjected to heat feedback, and then corresponding "cold shrinkage" will occur. When the heat-sensitive substance inside the storage pipe 125 shrinks, the inside of the sliding plugging block 123 will be further connected through the communication of the through pipe 112, so that the sliding plugging block 123 further shrinks, so as to expose the conduit 105, connect the external heat medium source and the conduit 105, and then further start the circulation component to carry out the heat medium circulation, so as to realize the preheating and heat preservation of the stop valve 1. At the same time, according to the characteristics of the heat-sensitive substance that "the lower the temperature, the faster the shrinkage and the greater the shrinkage rate", the heat medium can enter in a small amount and at a low speed for preheating first, and then rapidly heat up after being completely connected. Finally, when the temperature of the stop valve 1 rises to the normal temperature, the heat-sensitive substance can expand through the temperature conduction of the temperature conduction fin 106, so that the sliding plugging block 123 resets and closes the conduit 105 again, so as to perfectly meet the working process of "slow first and then fast, stop immediately after heating" when introducing the heating medium into the stop valve 1 in the usage requirements of the stop valve 1, so that the stop valve 1 can always be in a working state, which is beneficial to the transportation work in the synthesis process of m-nitrobenzotrifluoride.

[0088] Among them, the anti-blocking component includes an inner heat ring 115 and an inner heat ring 121. The inner heat ring 115 is installed on one side of the inside of the valve body 101 close to the feed port 102, and the inner heat ring 121 is installed on one side of the inside of the valve body 101 close to the discharge port 103. The tops of the inner heat ring 115 and the inner heat ring 121 are both connected to the inner bottom of the connecting pipe 104. The bottoms of the inner heat ring 115 and the inner heat ring 121 are both provided with circulation interfaces 107, and the bottoms of the circulation interfaces 107 penetrate through the bottom wall of the valve body 101. A fixing ring 135 is arranged inside the inner heat ring 115. In the middle of the outer circumference of the fixing ring 135, a blocking frame 131 is fixedly connected. The blocking frame 131 is installed between the fixing ring 135 and the inner heat ring 115. A rotating ring 132 is rotatably connected inside the fixing ring 135. Uniformly distributed inclined guide vanes 138 are fixedly connected to the inside of the rotating ring 132. At both ends of the outer circumference of the rotating ring 132, uniformly distributed first fixing rods 133 are fixedly connected. On one side of each first fixing rod 133, a second fixing rod 137 is fixedly connected. At the ends of the second fixing rods 137 far from the first fixing rods 133, rotating plates 136 are fixedly connected. The outer peripheries of the rotating plates 136 are rotatably connected to the inside of the inner heat ring 115. Uniformly distributed heat conducting sheets 134 are fixedly connected to both inner parts of the inner heat ring 115 and the inner heat ring 121. At the inner ends of the rotating plates 136, dial blocks 127 are fixedly connected.

[0089] Furthermore, in specific implementation, the blocking frame 131 inside the feed port 102 can intercept the crystals generated during the synthesis of m-nitrobenzotrifluoride, preventing large crystal clusters from entering the inside of the valve body 101, thereby effectively avoiding damage to the sealing plate 117 and the rotating frame 118. At the same time, during the transportation process of m-nitrobenzotrifluoride, a lateral impact can be generated on the guide vanes 138, causing the rotating ring 132 to rotate. When the rotating ring 132 rotates, it will drive the rotating plate 136 to continuously rotate through the first fixing rods 133 and the second fixing rods 137. The dial blocks 127 at the ends of the rotating plates 136 will continuously contact the blocking frame 131, enabling the blocking frame 131 to vibrate continuously, thereby preventing the crystals from solidifying on the blocking frame 131 and continuously shattering larger crystal clusters, which is beneficial to the transportation work of m-nitrobenzotrifluoride. During this process, part of the heat medium will be introduced into the inner heat ring 115 through the through port 130. Through the inner heat ring 115, the inside of the valve body 101 can be heated and the temperature can be raised, avoiding the continuous generation of crystals and accelerating the melting of the crystals, which is beneficial for actual use.

[0090] Among them, an anti-crystallization and anti-blocking process for the synthesis of m-nitrobenzotrifluoride includes the following operation steps:

[0091] S1. Preparation stage

[0092] S1.1. Installation and connection

[0093] ①. Connect the globe valve 1 to the m-nitrobenzotrifluoride conveying pipeline through the feed port 102 and the discharge port 103, ensuring good sealing to avoid leakage;

[0094] ②. Connect an external heat medium source such as steam or hot oil through the connecting pipe 104, and connect the circulation interface 107 to the heat medium circulation system;

[0095] S1.2. Inspection and Debugging

[0096] ①. Manual opening and closing test: Rotate the handwheel 109 and observe whether the valve stem 110 and the sealing plate 117 rise and fall smoothly, ensuring that the sealing plate 117 fits tightly with the middle partition plate 116 without jamming;

[0097] ②. Heat medium circulation test:

[0098] 1). In the initial state, the sliding plugging block 123 should block the conduit 105, and the heat medium does not flow. Confirm by observing the pressure gauge or temperature feedback of the circulation system;

[0099] 2). Simulate a low-temperature environment such as reducing the external temperature or manually triggering a thermosensitive substance, and observe whether the sliding plugging block 123 gradually opens the conduit 105 according to the characteristic of "the lower the temperature, the faster the contraction". The heat medium is preheated at a low speed first and then heated up rapidly, and finally automatically closes after the temperature reaches the standard;

[0100] 3). Function inspection of the blocking frame 131: Manually rotate the swivel ring 132 and confirm that the turning plate 136 and the dial block 127 can drive the blocking frame 131 to vibrate without jamming;

[0101] S2. Startup Phase

[0102] S2.1. Preheating and Insulating in a Low-Temperature Environment

[0103] ①. When the external temperature is lower than the melting point of m-nitrobenzotrifluoride by 5°C, the thermosensitive substance senses the low temperature through the heat conduction fins 106, contracts and opens the conduit 105, and the heat medium enters the cavity 114 and the inner heat ring 115 according to the "slow first and then fast" process:

[0104] ②. Low-speed preheating: The initial heat medium flow rate is small, and it circulates slowly through the circulation interface 107 to raise the valve body temperature to about 5°C to avoid crystallization and sudden condensation due to excessive temperature difference;

[0105] ③. Rapid heating: When the thermosensitive substance further contracts and the conduit 105 is fully opened, the heat medium circulates at full speed, and the valve body temperature is maintained at 10°C - 20°C, which is more than 5°C higher than the melting point;

[0106] ④. After the temperature stabilizes, confirm through the valve body temperature sensor and enter the next operation;

[0107] S2.2. Open the Globe Valve

[0108] ①. Slowly rotate the handwheel 109 clockwise. Through the cooperation between the threaded section of the valve stem 110 and the threaded plate 111, drive the sealing plate 117 to rise:

[0109] ②. During the rising process, the sealing plate 117 drives the rotating frame 118 to rotate synchronously through the friction force of the rotating sleeve 119, initially cleaning the connection port of the middle partition plate 116 to remove possible crystal residues;

[0110] ③. When there is a gap between the sealing plate 117 and the middle partition plate 116, the liquid inlet chamber 122 is communicated with the liquid outlet chamber 120, and the stop valve opens to start transporting m-nitrobenzotrifluoride;

[0111] S3. Operation stage

[0112] S3.1. Normal transportation monitoring

[0113] ①. Temperature monitoring: Monitor the valve body temperature in real time through the heat conduction fins or built-in sensors to ensure it is maintained between 10°C and 20°C; if the temperature drops close to 5°C, check whether the heat medium circulation is abnormal, such as pipeline blockage or heat source failure, and troubleshoot in time;

[0114] ②. Crystal cleaning:

[0115] 1). During the transportation process, the flowing medium impacts the rotating frame 118, causing it to continuously rotate, dynamically cleaning the connection port of the middle partition plate to prevent crystal accumulation;

[0116] 2). The blocking frame 131 at the feed port intercepts large crystals. At the same time, the flowing medium impacts the guide vane 138 to drive the rotating ring 132 to rotate, and through the rotating plate 136 and the blocking block 127, vibrate the blocking frame 131 to break up the crystal clusters and prevent solidification;

[0117] 3). Pressure monitoring: Observe the pipeline pressure gauge. If the pressure rises abnormally, it may be due to crystal blockage. Immediately check whether the valve body interior or the upstream filter needs to be cleaned;

[0118] S3.2. Intelligent control of heat medium circulation

[0119] ①. The system automatically adjusts the heat medium flow according to the valve body temperature:

[0120] ②. When the temperature reaches the standard, the thermosensitive substance expands to push the sliding sealing block 123 to reset, closing the conduit 105, and the heat medium circulation pauses to save energy consumption;

[0121] ③. When the temperature drops again, automatically repeat the "preheating - heating - pause" process to maintain a constant temperature;

[0122] S4. Stop stage

[0123] S4.1. Close the stop valve

[0124] ①. Slowly rotate the handwheel 109 counterclockwise to drive the sealing plate 117 to descend until it completely fits the middle partition plate 116, blocking the liquid inlet cavity and the liquid outlet cavity, and stop the transportation;

[0125] ②. During the closing process, the rotating frame 118 rotates synchronously with the sealing plate 117 to clean the connection port again to avoid the crystallization adhesion of the residual medium;

[0126] S4.2. Heat medium circulation treatment

[0127] ①. If restarting within a short time, keep the heat medium circulation system on standby to maintain low-flow preheating; if shutting down for a long time:

[0128] ②. Close the external heat medium source, drain the residual medium in the cavity 114, the inner heat ring one 115 and the inner heat ring two 121 to prevent condensation and crystallization;

[0129] ③. Manually clean the residual crystals on the surface of the blocking frame 131 to avoid affecting the next startup after solidification;

[0130] S5. Maintenance

[0131] S5.1 Regular inspection

[0132] Weekly: Disassemble the handwheel assembly at the top of the valve body, check the wear of the valve stem 110 and the threaded plate 111, and apply grease to prevent jamming;

[0133] Monthly: Clean the upstream filter, remove impurities and crystallization nuclei, check the rotational flexibility of the rotating frame 118 and the rotating ring 132, and replace the worn dial block 127 or guide vane 138;

[0134] Quarterly: Conduct a pressure test on the insulation jacket to ensure no leakage of the heat medium; detect the performance of the thermosensitive substance, and replace the storage tube 125 assembly in time if it fails;

[0135] S5.2. Abnormal handling

[0136] If crystallization blockage occurs, it can be dredged by the following methods:

[0137] ①. Temporarily raise the temperature of the heat medium to 30°C - 40°C, melt the crystals and then clean them;

[0138] ②. Disassemble the valve body, manually remove the crystals at the middle partition plate 116 and the blocking frame 131, and check whether the sealing surface of the sealing plate 117 is damaged.

[0139] Working principle:

[0140] In actual use, when transporting m-nitrobenzotrifluoride, people can connect the conveying pipeline through the stop valve 1, so as to control the opening and closing of the conveying work. People can drive the valve stem 110 to rotate by turning the handwheel 109. Then, through the cooperation between the threaded section on the valve stem 110 and the threaded plate 111, the valve stem 110 and the bottom sealing plate 117 can be driven to lift and lower. When the valve stem 110 and the sealing plate 117 rise, a gap appears between the sealing plate 117 and the middle partition plate 116, so that the liquid inlet cavity 122 is connected to the liquid outlet cavity 120. At this time, the stop valve 1 is in the open state. When the valve stem 110 and the sealing plate 117 descend, the middle part of the middle partition plate 116 can be closed by the sealing plate 117, so as to block the liquid inlet cavity 122 and the liquid outlet cavity 120, realizing the closing of the stop valve 1 and stopping the conveying work. During the actual conveying process, when opening the sealing plate 117, the friction force between the rotating sleeve 119 and the valve stem 110 can drive the sealing plate 117 and the rotating frame 118 to rotate and rise synchronously, so that at the beginning of the conveying, the rotating frame 118 can rotate and clean the connection port in the middle of the middle partition plate 116, making the subsequent conveying smooth. Then, when m-nitrobenzotrifluoride is normally conveyed, the continuously flowing m-nitrobenzotrifluoride will impact the rotating frame 118, driving the rotating frame 118 and the sealing plate 117 to rotate, realizing the continuous cleaning of the connection port in the middle of the middle partition plate 116, avoiding partial crystallization getting stuck in the connection port in the middle of the middle partition plate 116 and causing blockage, which is beneficial to the continuous conveying work during the synthesis process of m-nitrobenzotrifluoride. Before conveying, people can connect an external heat medium source through the connecting pipe 104, so as to input heat medium into the cavity 114. Through the circulation interface 107, the circulation of the heat medium can be realized. The sliding plugging block 123 inside the connecting pipe 104 can realize the plugging of the conduit 105, so as to block the connection of the connecting pipe 104 when the stop valve 1 is not working or the temperature is relatively high usually. Through the temperature conducting fins 106, the conduction of the external temperature can be realized, so as to effectively reduce unnecessary losses and inputs. When the external environmental temperature is relatively low, the temperature will be timely transmitted to the inside of the storage pipe 125 through the conduction of the temperature conducting fins 106, so that the heat-sensitive substance inside the storage pipe 125 can receive heat feedback in time and then perform corresponding "cold shrinkage". When the heat-sensitive substance inside the storage pipe 125 shrinks, through the connection of the through pipe 112, the inside of the sliding plugging block 123 will be further connected, so that the sliding plugging block 123 further shrinks, so that the conduit 105 can be exposed, connecting the external heat medium source and the conduit 105, so as to further start the circulation component and carry out the circulation of the heat medium, realizing the preheating and heat preservation work of the stop valve 1. At the same time, according to the characteristics of the heat-sensitive substance that "the lower the temperature, the faster the shrinkage and the greater the shrinkage rate", the heat medium can enter in a small amount and at a low speed for preheating first, and then quickly heat up after being completely connected. Finally, when the temperature of the stop valve 1 rises to the normal temperature, the heat-sensitive substance can expand through the temperature conduction of the temperature conducting fins 106, so that the sliding plugging block 123 resets.The conduit 105 is resealed, so that it can perfectly meet the working process of "slow first and then fast, stop immediately after heating" when introducing the heating medium into the globe valve 1 in the usage requirements of the globe valve 1, so that the globe valve 1 can always be in a working state, which is beneficial to the conveying work in the synthesis process of m-nitrobenzotrifluoride. Further, the blocking frame 131 inside the feed port 102 can intercept the crystals generated in the synthesis of m-nitrobenzotrifluoride, avoiding large crystal clusters from entering the inside of the valve body 101, so that the damage to the sealing plate 117 and the rotating frame 118 can be effectively avoided. At the same time, the lateral impact on the guide vane 138 can be generated during the conveying process of m-nitrobenzotrifluoride, so that the rotating ring 132 can rotate. When the rotating ring 132 rotates, it will drive the rotating plate 136 to continuously rotate through the first fixing rod 133 and the second fixing rod 137. The dial block 127 at the end of the rotating plate 136 will continuously contact the blocking frame 131, so that the blocking frame 131 can continuously vibrate, so that the crystallization on the blocking frame 131 can be avoided from solidifying, and at the same time, the larger crystal clusters can be continuously shattered, which is beneficial to the conveying work of m-nitrobenzotrifluoride. During this process, part of the heat medium will be introduced into the inner heat ring 115 through the through port 130. Through the inner heat ring 115, the heating and temperature rise of the inside of the valve body 101 can be realized, the continuous generation of crystals can be avoided, and at the same time, the melting of the crystals can be accelerated, which is beneficial to the actual use.

[0141] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection required by the present invention is defined by the appended claims and their equivalents.

Claims

1. A globe valve for preventing crystallization blockage in the synthesis of m-nitrobenzotrifluoride, comprising a globe valve (1), characterized in that: The globe valve (1) includes a valve body (101). An opening and closing component is arranged inside the valve body (101). An anti-blocking component is arranged on one side inside the globe valve (1). Temperature control components are arranged on both sides of the upper part of the globe valve (1). The opening and closing component is used to control the opening and closing of the globe valve (1). The anti-blocking component is used to prevent blockage inside the globe valve (1). The temperature control component is used to ensure the continuous working performance of the globe valve (1). The opening and closing component includes a valve stem (110). A rotating sleeve (119) is rotatably connected to the bottom of the valve stem (110). A sealing plate (117) is fixedly connected to the bottom of the rotating sleeve (119). A rotating frame (118) is fixedly connected to the bottom of the sealing plate (117). The sealing plate (117), the rotating frame (118) and the rotating sleeve (119) are all arranged inside the valve body (101). A valve cover (108) is installed on the top of the valve body (101). Mounting rods (113) are installed on both sides of the top of the valve cover (108). A threaded plate (111) is installed on the top of the valve cover (108) through the mounting rods (113). A threaded section is arranged in the middle and upper part of the outer circumference of the valve stem (110). The valve stem (110) is threadedly connected to the threaded plate (111) through the threaded section. A handwheel (109) is installed on the top of the valve stem (110). A feed inlet (102) is arranged on one side of the valve body (101). A discharge outlet (103) is arranged on the other side of the valve body (101).

2. The globe valve for preventing crystallization blockage in the synthesis of m-nitrobenzotrifluoride according to claim 1, characterized in that: The temperature control component includes two connecting pipes (104). The connecting pipes (104) are fixedly connected to both sides of the top of the valve body (101). A cavity (114) is arranged in the middle of the wall of the valve body (101). Guide pipes (105) are fixedly connected to the middle of both sides of the outer circumference of the connecting pipes (104). The ends of the guide pipes (105) far from the connecting pipes (104) are communicated with the cavity (114).

3. The globe valve for preventing crystallization blockage in the synthesis of m-nitrobenzotrifluoride according to claim 1, wherein: The anti-blocking component includes an inner heat ring one (115) and an inner heat ring two (121). The inner heat ring one (115) is installed on one side inside the valve body (101) close to the feed inlet (102). The inner heat ring two (121) is installed on one side inside the valve body (101) close to the discharge outlet (103). The tops of the inner heat ring one (115) and the inner heat ring two (121) are both communicated with the inner bottom of the connecting pipes (104). Circulation interfaces (107) are installed at the bottoms of the inner heat ring one (115) and the inner heat ring two (121). The bottoms of the circulation interfaces (107) penetrate through the bottom wall of the valve body (101). A fixing ring (135) is arranged inside the inner heat ring one (115). A blocking frame (131) is fixedly connected to the middle of the outer circumference of the fixing ring (135). The blocking frame (131) is installed between the fixing ring (135) and the inner heat ring one (115). A rotating ring (132) is rotatably connected to the inside of the fixing ring (135). Uniformly distributed inclined guide vanes (138) are fixedly connected to the inside of the rotating ring (132).

4. The shut-off valve for preventing crystallization blockage in the synthesis of m-nitrobenzotrifluoride according to claim 1, characterized in that: In the middle of the valve body (101), a middle partition plate (116) is fixedly connected. A connection port is provided in the middle of the middle partition plate (116). A liquid inlet cavity (122) communicating with the feed port (102) is provided at the lower part of the middle partition plate (116), and a liquid outlet cavity (120) communicating with the discharge port (103) is provided at the upper part of the middle partition plate (116).

5. The stop valve for preventing crystallization blockage in the synthesis of m-nitrobenzotrifluoride according to claim 2, characterized in that: At the upper part inside the connecting pipe (104), fixing frames (139) are fixedly connected. At the bottom of each fixing frame (139), sliding pipes (129) are fixedly connected. At the bottom of each sliding pipe (129), fixing disks (124) are fixedly connected, and the fixing disks (124) are all installed in the middle and lower parts inside the connecting pipe (104).

6. The stop valve for preventing crystallization blockage in the synthesis of m-nitrobenzotrifluoride according to claim 5, wherein: Uniformly distributed openings (128) are formed in the middle and lower parts of the outer periphery of the sliding pipe (129). Through holes (130) are formed at the bottom of each fixing disk (124). A sliding plugging block (123) is sleeved on the middle and lower parts of the outer periphery of the sliding pipe (129). The bottom of the sliding plugging block (123) is installed on the top of the fixing disk (124), and the sliding end at the top of the sliding plugging block (123) is slidably connected to the sliding pipe (129).

7. The globe valve for preventing crystallization blockage in the synthesis of m-nitrobenzotrifluoride according to claim 6, wherein: Fixing springs (126) are sleeved on the upper parts of the outer peripheries of the sliding pipes (129). The fixing springs (126) are all arranged between the fixing frames (139) and the sliding plugging blocks (123). At the lower parts of the front and rear sides of the outer periphery of the sliding plugging block (123), through pipes (112) are fixedly connected. At the end of each through pipe (112) away from the sliding plugging block (123), storage pipes (125) are fixedly connected. Uniformly distributed heat conduction fins (106) are fixedly connected to the outer peripheries of the storage pipes (125), and heat-sensitive substances are arranged inside the storage pipes (125).

8. The globe valve for preventing crystallization blockage in the synthesis of m-nitrobenzotrifluoride according to claim 3, characterized in that: At both ends of the outer periphery of the rotating ring (132), uniformly distributed first fixing rods (133) are fixedly connected. On one side of each first fixing rod (133), a second fixing rod (137) is fixedly connected. At the end of each second fixing rod (137) away from the first fixing rod (133), a rotating plate (136) is fixedly connected.

9. The globe valve for preventing crystallization blockage in the synthesis of m-nitrobenzotrifluoride according to claim 8, characterized in that: The outer peripheral edges of the rotating plates (136) are rotatably connected to the inside of the first internal heat ring (115). Uniformly distributed heat conduction sheets (134) are fixedly connected to the inner sides of both the first internal heat ring (115) and the second internal heat ring (121). At the inner ends of the inner sides of the rotating plates (136), dialing blocks (127) are fixedly connected.

10. A process for preventing crystallization and blockage in the synthesis of m-nitrobenzotrifluoride, which is applied to a globe valve for preventing crystallization and blockage in the synthesis of m-nitrobenzotrifluoride according to any one of claims 1-9, and is characterized in that: It includes the following operation steps: S1. Preparation stage S1.

1. Installation and connection ①. Connect the stop valve (1) to the m-nitrobenzotrifluoride conveying pipeline through the feed port (102) and the discharge port (103), ensure good sealing and avoid leakage; ②. Connect an external heat medium source through the connecting pipe (104), and connect the circulation interface (107) to the heat medium circulation system; S1.

2. Inspection and debugging ①. Manual opening and closing test: Rotate the handwheel (109), observe whether the valve stem (110) and the sealing plate (117) lift and lower smoothly, ensure that the sealing plate (117) fits tightly with the middle partition plate (116) and there is no jamming; ②. Heat medium circulation test: 1) In the initial state, the sliding sealing block (123) should seal the conduit (105) to prevent the flow of the heat medium. 2) Simulate a low-temperature environment and observe whether the sliding sealing block (123) gradually opens the conduit (105) according to the characteristic that "the lower the temperature, the faster the contraction". The heat medium is preheated at a low speed first, then heated up rapidly, and finally automatically closes after reaching the standard temperature. 3) Function check of the blocking frame (131): Manually rotate the swivel ring (132) and confirm that the rotating plate (136) and the dial block (127) can drive the blocking frame (131) to vibrate without jamming. S2. Startup stage S2.

1. Preheating and heat preservation ① When the external temperature is lower than the melting point of m-nitrobenzotrifluoride, the thermosensitive substance senses the low temperature through the heat-conducting fins (106), contracts and then opens the conduit (105). The heat medium enters the cavity (114) and the inner heat ring I (115) according to the "slow first and then fast" process. ② Low-speed preheating: The initial heat medium flow rate is small, and it circulates slowly through the circulation interface (107) to raise the valve body temperature to about 5°C. ③ Rapid heating: When the thermosensitive substance further contracts and the conduit (105) is fully opened, the heat medium circulates at full speed to maintain the valve body temperature at 10°C - 20°C. ④ After the temperature stabilizes, proceed to the next operation. S2.

2. Open the stop valve ① Slowly rotate the handwheel (109) clockwise. Through the cooperation of the threaded section of the valve stem (110) and the threaded plate (111), drive the sealing plate (117) to rise. ② During the rising process, the sealing plate (117) drives the rotating frame (118) to rotate synchronously through the friction force of the rotating sleeve (119), initially cleaning the connection port of the middle partition plate (116) to remove possible crystal residues. ③ When there is a gap between the sealing plate (117) and the middle partition plate (116), the liquid inlet chamber (122) is connected to the liquid outlet chamber (120), the stop valve opens, and the transportation of m-nitrobenzotrifluoride begins. S3. Operation stage S3.

1. Normal transportation monitoring ① Temperature monitoring: Continuously monitor the valve body temperature to ensure it is maintained at 10°C - 20°C. If the temperature drops close to 5°C, check whether the heat medium circulation is abnormal and troubleshoot in time. ② Crystal cleaning: 1) During transportation, the flowing medium impacts the rotating frame (118), causing it to rotate continuously, dynamically cleaning the connection port of the middle partition plate to prevent crystal accumulation. 2) The blocking frame (131) at the feed inlet intercepts large crystals. At the same time, the flowing medium impacts the guide vane (138) to drive the swivel ring (132) to rotate. Through the rotating plate (136) and the dial block (127), the blocking frame (131) vibrates to shatter the crystal clusters and prevent solidification. 3) Pressure monitoring: Observe the pipeline pressure gauge. If the pressure rises abnormally, immediately check whether the inside of the valve body or the upstream filter needs to be cleaned. S3.

2. Intelligent control of heat medium circulation ① The system automatically adjusts the heat medium flow rate according to the valve body temperature. ② When the temperature reaches the standard, the thermosensitive substance expands and pushes the sliding sealing block (123) to reset, closing the conduit (105) and pausing the heat medium circulation to save energy. ③ When the temperature drops again, automatically repeat the "preheating - heating - pausing" process to maintain a constant temperature. S4. Stop stage S4.

1. Close the stop valve ①. Slowly rotate the handwheel (109) counterclockwise to drive the sealing plate (117) to descend until it completely fits the middle partition plate (116), blocking the liquid inlet cavity and the liquid outlet cavity, and stop the conveying; ②. During the closing process, the rotating frame (118) rotates synchronously with the sealing plate (117) to clean the connection port again to avoid crystal adhesion of the residual medium; S4.

2. Thermal medium circulation treatment ①. If restarting within a short time, keep the thermal medium circulation system in standby; if shutting down for a long time: ②. Close the external thermal medium source, drain the residual medium in the cavity body (114), the inner heat ring I (115) and the inner heat ring II (121) to prevent condensation and crystallization; ③. Manually clean the residual crystals on the surface of the blocking frame (131) to avoid affecting the next startup after solidification; S5. Maintenance and repair S5.1 Regular inspection Weekly: Disassemble the handwheel assembly at the top of the valve body, check the wear of the valve stem (110) and the threaded plate (111), and apply grease to prevent jamming; Monthly: Clean the upstream filter, remove impurities and crystal nuclei, check the rotational flexibility of the rotating frame (118) and the rotating ring (132), and replace the worn dial block (127) or guide vane (138); Quarterly: Conduct a pressure test on the thermal insulation jacket to ensure that there is no leakage of the thermal medium; detect the performance of the thermosensitive substance, and replace the storage tube (125) assembly in time if it fails; S5.

2. Abnormal handling If crystal blockage occurs, it can be dredged by the following methods: ①. Temporarily raise the temperature of the thermal medium to 30°C - 40°C, melt the crystals and then clean them; ②. Disassemble the valve body, manually remove the crystals at the middle partition plate (116) and the blocking frame (131), and check whether the sealing surface of the sealing plate (117) is damaged.

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