A device for preventing valves from freezing in low temperature working conditions

Abstract

The utility model discloses a device for preventing valves from freezing in low-temperature working conditions, comprising: a stainless steel gas source pipe, a gate valve connected to the stainless steel gas source pipe, a filter pressure reducing valve connected to the filter pressure reducing valve, a flow regulating stop valve connected to the flow regulating stop valve, an electric heater assembly connected to a rotor flow meter, a rotor flow meter connected to a universal stainless steel winding pipe, a universal stainless steel winding pipe connected to a universal nozzle; the electric heater assembly is connected to a power circuit. The gas medium is heated by an electric heating device; the medium flow is controlled by the rotor flow meter and a hand valve, and then the outlet flow is controlled; two universal stainless steel winding metal nozzles are installed at the outlet, and the angle can be freely adjusted to achieve 360° all-round purging and heating; the large and small flow rate regulation and the high and low temperature regulation can be met at the same time, and the purpose of good effect and low energy consumption is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of regulating valves under low-temperature working conditions, in particular to a device for preventing valves from freezing under low-temperature working conditions. Background Art

[0002] In the low temperature working conditions of chemical enterprises, a typical air separation unit is used as an example. The air separation unit is a set of industrial equipment that separates the various gas components in the air and produces oxygen, nitrogen, argon and other gases in the air. The most commonly used separation method is cryogenic distillation. The cryogenic separation method converts air into liquid by deep freezing through compression cycle, and then undergoes cryogenic distillation to gradually separate oxygen, nitrogen, argon and other inert gases from liquid air according to different boiling points. It is widely used in traditional metallurgy, new coal chemical industry, large-scale nitrogen fertilizer, professional gas supply and other fields. Low temperature working conditions are a severe test for the use of regulating valves. There is a risk that valve accessories will be frozen, which will cause the valve to fail to operate and cause refusal to operate, causing fluctuations in the production of the device. For example, the inlet and outlet regulating valves and reflux regulating valves of the liquid oxygen pump in the cold box area of ​​the air separation unit, once the device is adjusted, abnormal or encounters a major accident such as a fire, and the regulating valve refuses to operate, the material cannot be cut off in time, which is bound to cause more serious consequences. At present, there is no device that can efficiently, energy-saving and environmentally friendly solve the problem of valve stem freezing under low temperature conditions. If hot water or steam is used to heat the valve stem, the temperature cannot be controlled, resulting in damage to the equipment and waste of resources.

[0003] For example, an "intelligent water pipe antifreeze device and antifreeze method thereof" disclosed in Chinese patent literature, with publication number: CN117846086A, discloses a water temperature display touch screen, a power interface, an electric valve, a water temperature control board, and a drain outlet. The outer shell is composed of a front and rear shell snap connection. The front and rear surfaces of the outer shell are inlaid with a water temperature display touch screen, a power interface is installed on the upper side of the outer shell, and external thread joints are installed on the lower sides of the outer shell. The external thread joints are connected to the electric valve toward the inner side of the middle part, and the electric valve is connected to the drain outlet through an internal thread joint. A water temperature control board is installed on the inner wall of the outer shell. However, the antifreeze effect of this solution is limited. Summary of the invention

[0004] In order to solve the problem of inaccurate antifreeze of low-temperature working valves in the prior art, the utility model provides a device for preventing freezing of low-temperature working valves, which uses a universal nozzle and a hose to perform heated gas blowing and can simultaneously meet the requirements of large and small flow rate regulation and high and low temperature regulation, thereby achieving efficient antifreeze.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A device for preventing valves from freezing in low-temperature working conditions comprises: a stainless steel gas source pipe, a gate valve connected to the stainless steel gas source pipe, a filter pressure reducing valve connected to the filter pressure reducing valve, a flow regulating stop valve connected to an electric heater assembly, a rotor flow meter connected to the rotor flow meter, a universal stainless steel winding pipe connected to the universal stainless steel winding pipe, and a universal nozzle; the electric heater assembly is connected to a power circuit. The gas medium is heated by an electric heating device; the medium flow is controlled by the rotor flow meter and the hand valve, and then the outlet flow is controlled; two universal stainless steel winding metal nozzles are installed at the outlet, and the angle can be freely adjusted to achieve 360° all-round purging and heating; the large and small flow rates and high and low temperature adjustments can be met at the same time, achieving the purpose of good effect and low energy consumption.

[0007] Preferably, the universal nozzle comprises a nozzle, the nozzle is connected with a spherical locking nut, and the spherical locking nut is connected with a universal stainless steel winding tube, so as to facilitate heating and purging of the target at 360° without dead angles.

[0008] Preferably, the electric heater assembly comprises a stainless steel heater housing, and air heating fins are arranged inside the stainless steel heater housing to achieve efficient heating of the purge gas.

[0009] Preferably, an electric heater sealing box is provided at the connection between the electric heater assembly and the power circuit, and a graphite nickel wire packing is provided at the electric heater sealing box to ensure the sealing of the electric heater.

[0010] Preferably, the stainless steel gas source pipe is connected to the gate valve via a ferrule terminal joint; and the gate valve is connected to the filter pressure reducing valve via a ferrule terminal joint, so as to ensure the sealing of the purge gas delivery process.

[0011] Preferably, the electric heater assembly is connected with a temperature control switch, and the temperature control switch is connected to a power supply circuit, so as to adjust the temperature and facilitate accurate temperature control.

[0012] Preferably, the purge assembly includes a shell, the gate valve is located inside the shell, and the rotor flowmeter is located outside the shell, which is convenient for use and ensures that the purge process will not be affected by the shell.

[0013] Preferably, the purge assembly housing includes an explosion-proof junction box, and the stainless steel heater housing includes a seamless steel pipe. The explosion-proof junction box enables use in explosion-proof scenarios, and the seamless steel pipe ensures the sealing of the heating process.

[0014] The utility model has the following advantages:

[0015] (1) The gas medium is heated by an electric heating device, and the start and stop of the electric heater is controlled by a temperature control switch, thereby adjusting the outlet temperature to avoid blindly heating and ensure energy saving and environmental protection; the medium flow is controlled by a rotor flowmeter and a hand valve, thereby controlling the outlet flow; two universal stainless steel winding metal nozzles are installed at the outlet, and the angle can be freely adjusted to achieve 360° all-round purge heating; (2) It can simultaneously meet the needs of large and small flow regulation and high and low temperature regulation, achieving the purpose of good effect and low energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described below are merely exemplary. A person skilled in the art can derive other implementation drawings based on the provided drawings without inventive effort.

[0017] Figure 1 Schematic diagram of the gas path structure in the embodiment.

[0018] Figure 2 Schematic diagram of the structure of the nozzle in the embodiment.

[0019] Figure 3 Schematic diagram of the structure of the air heating flap in the embodiment.

[0020] In the figure:

[0021] 1-gate valve; 2-filter pressure reducing valve; 3-flow regulating stop valve; 4-electric heater assembly; 5-rotor flowmeter; 6-temperature control switch; 7-universal stainless steel winding pipe; 8-stainless steel air source pipe; 9-power circuit; 10-purge assembly housing; 11-electric heater sealing box; 12-air heating flap; 13-stainless steel heater housing; 14-universal nozzle; 15-nozzle; 16-ball locking nut. DETAILED DESCRIPTION

[0022] Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present utility model.

[0023] like Figure 1-3As shown, in a preferred embodiment, the utility model discloses a device for preventing valves from freezing under low temperature working conditions, comprising: a gate valve 1, wherein the gate valve 1 is provided with a purge gas port, and the purge gas is input at the purge gas port. A filter pressure reducing valve 2 is connected to the gate valve 1, and the filter pressure reducing valve 2 filters the purge gas output by the gate valve 1, reduces impurities in the purge gas, and reduces the pressure of the purge gas before outputting it. A flow regulating stop valve 3 is connected to the filter pressure reducing valve 2, and the flow regulating stop valve 3 throttles the purge gas output by the filter pressure reducing valve 2. The flow regulating stop valve 3 has different flow rates when working. The filter pressure reducing valve 2 and the flow regulating stop valve 3 are used to reduce the pressure and throttle the purge gas after input, so as to avoid the direct entry of purge gas with large flow and pressure, and to avoid the purge gas from generating a greater pressure or volume after heating, thereby affecting the effect and safety of purge heating.

[0024] The flow regulating stop valve 3 is connected to an electric heater assembly 4, and the purge gas output by the flow regulating stop valve 3 is heated by the electric heater assembly 4. The purge gas is heated in the electric heater assembly 4 to obtain high-temperature antifreeze gas, and the high-temperature antifreeze gas is used as an antifreeze medium, and then the high-temperature antifreeze gas is transported to the valve stem that needs to be insulated for insulation to prevent the valve stem from freezing under low-temperature conditions. At the same time, the heat carried by the high-temperature antifreeze gas is difficult to pass through the valve stem to affect the low-temperature conditions.

[0025] The electric heater assembly 4 includes a stainless steel heater shell 13, and a cavity is provided inside the stainless steel heater shell 13. The stainless steel heater shell 13 is resistant to high temperatures and has good sealing properties, which can reduce the impact of external temperature on the inside of the stainless steel heater shell 13. An air heating flap 12 is provided inside the stainless steel heater shell 13, and the air heating flap 12 heats the purge gas entering the stainless steel heater shell 13. The length of the air heating flap 12 is less than the length of the stainless steel heater shell 13. One end of the air heating flap 12 is connected to one end face of the cavity inside the stainless steel heater shell 13, and a gap is provided between the other end of the air heating flap 12 and the other end face of the cavity inside the stainless steel heater shell 13.

[0026] The stainless steel heater housing 13 is provided with a gas inlet, which is located at the bottom of the side end surface of the stainless steel heater housing 13. The gas inlet is connected to the flow regulating stop valve 3, and the flow regulating stop valve 3 outputs the purge gas to the inside of the stainless steel heater housing 13 through the gas inlet. The stainless steel heater housing 13 is provided with a gas outlet, which is located at the top of the side end surface of the stainless steel heater housing 13. After the purge gas is heated inside the stainless steel heater housing 13, it leaves the stainless steel heater housing 13 through the gas outlet.

[0027] A rotor flowmeter 5 is connected to the rear of the electric heater assembly 4, and the rotor flowmeter 5 adjusts the flow rate of the purge gas output by the electric heater assembly 4. The rotor flowmeter 5 is connected to the gas outlet of the stainless steel heater housing 13. After being heated by the air heating flap 12, the purge gas reaches the rotor flowmeter 5 through the gas outlet. The flow rate of the output purge gas is adjusted by the rotor flowmeter 5. When the flow rate of the purge gas output by the rotor flowmeter 5 increases, the temperature of the purge gas output by the rotor flowmeter 5 increases; when the flow rate of the purge gas output by the rotor flowmeter 5 decreases, the temperature of the purge gas output by the rotor flowmeter 5 actually decreases because the purge gas is constantly dissipating heat.

[0028] The rotor flowmeter 5 is connected to a universal stainless steel winding pipe 7, which receives the purge gas output by the rotor flowmeter 5 and delivers the purge gas according to the direction of its own winding pipe arrangement. The universal stainless steel winding pipe 7 is connected to a universal nozzle 14. The universal nozzle 14 receives the purge gas delivered by the universal stainless steel winding pipe 7 and completes the ejection of the purge gas. The purge gas is sprayed to the valve stem under low temperature conditions through the universal nozzle 14, so as to achieve heat preservation at the valve stem under low temperature conditions and prevent freezing.

[0029] In other embodiments, a temperature control switch 6 is further connected to the rotor flowmeter 5, and the temperature control switch 6 is connected to the electric heater assembly 4. The temperature control switch 6 controls the power of the electric heater assembly 4. Further, the temperature control switch 6 is provided with a plurality of gears, and different gears correspond to different output powers of the electric heater assembly 4.

[0030] In other embodiments, the gate valve 1 is connected to a stainless steel gas source input pipe, and the stainless steel gas source input pipe and the filter pressure reducing valve 2 are respectively located at both ends of the gate valve 1. Untreated purge gas enters the gate valve 1 through the stainless steel gas source input pipe. The stainless steel gas source input pipe and the gate valve 1 are fixedly connected by a ferrule-type terminal joint.

[0031] In other embodiments, the gate valve 1 and the filter pressure reducing valve 2 are also fixedly connected via a ferrule-type terminal joint, thereby preventing leakage of the purge gas and ensuring the sealing performance when the purge gas is input.

[0032] In other embodiments, the outer layer of the universal stainless steel winding tube 7 is a stainless steel annular sheet, and the universal stainless steel winding tube 7 has the same structural characteristics as a hose, and the universal stainless steel winding tube 7 does not have a fixed pipeline direction, so that the purge gas can be guided to different positions as needed.

[0033] In other embodiments, the electric heater assembly 4 is connected to a power circuit 9, and the power circuit 9 includes a 220V power supply. The 220V power supply is connected to a power line, and the power line is connected to the electric heater assembly 4. The power circuit 9 is used to supply power to the electric heater assembly 4. The electric heater assembly 4 is thereby driven to heat the purge gas.

[0034] The power supply circuit is fixedly connected to the stainless steel heater housing 13, and the power supply circuit passes through the stainless steel heater housing 13 and is connected to the air heating flap 12 inside the stainless steel heater housing. The power supply circuit outputs the electric energy of the 220V power supply to the air heating flap 12. An electric heater sealing box 11 is provided at the connection between the power supply circuit and the stainless steel heater housing 13. The electric heater sealing box 11 is used to seal the stainless steel heater housing 13, so as to avoid poor sealing inside the stainless steel heater housing 13 when the power supply circuit passes through the stainless steel heater housing 13, thereby leaking the purge gas that is being heated or has been heated.

[0035] In other embodiments, the electric heater sealing box 11 and the stainless steel heater housing 13 are sealed by a graphite nickel wire packing thread compression, which ensures the sealing inside the stainless steel heater housing 13 and has the characteristics of high temperature resistance and corrosion resistance.

[0036] In other embodiments, the air heating flap 12 includes a 220V-200W heater, and the air heating flap 12 includes a base tube, and a plurality of fins are arranged on the side of the base tube to form a fin tube. The fins greatly increase the heat exchange area, thereby improving the heat exchange efficiency. During heating, heat conduction and convection heat exchange occur at the fins. When the cold and hot purge gases flow through the two sides of the fin tube respectively, the heat is transferred from the high-temperature purge gas to the low-temperature purge gas through the fin tube wall. The presence of the fins allows the heat to diffuse more quickly to the entire fin surface, thereby improving the heat transfer efficiency.

[0037] In other embodiments, the stainless steel heater housing 13 is made of a DN40 high temperature resistant seamless steel pipe, and the seamless steel pipe is sealed and welded to form the stainless steel heater housing 13. The stainless steel heater housing 13 is a cylindrical shell. The central axis of the stainless steel heater housing 13 is the same as the central axis of the air heating fin.

[0038] In other embodiments, the universal nozzle 14 includes a nozzle 15, and the diameter of the nozzle 15 is 1 mm. The nozzle 15 is connected to a spherical locking nut 16, and the spherical structure at the top of the spherical locking nut 16 is connected to the nozzle 15, so that the nozzle 15 can rotate 360° around the top of the spherical locking nut 16, which is more convenient to use. The bottom of the spherical locking nut 16 is provided with a thread connected to the universal stainless steel winding tube 7.

[0039] In other embodiments, the temperature control switch 6 is connected to the power circuit 9, and the power circuit 9 transmits the electric energy of the 220V power supply to the temperature control switch 6. The temperature control switch 6 is provided with a plurality of temperature gears, and the electric heater assembly 4 is controlled to work according to the corresponding power gear at different temperature gears.

[0040] In other embodiments, a purge assembly housing 10 is included, and the stainless steel gas source pipe 8 passes through the purge assembly housing 10 to connect the inside and outside of the purge assembly housing 10. The gate valve 1, the filter pressure reducing valve 2, the flow regulating stop valve 3, and the electric heater assembly 4 are all located inside the purge assembly housing 10. The power supply circuit 9 passes through the purge assembly housing 10 to connect the inside and outside of the purge assembly housing 10, and the 220V power supply is located outside the purge assembly housing 10. The rotor flowmeter 5 is located outside the purge assembly housing 10. The purge assembly housing is an explosion-proof junction box to meet the use of explosion-proof scenarios.

[0041] In another embodiment, the flow regulating stop valve 3 is a sleeve type stop valve.

[0042] In other embodiments, a temperature-controllable universal gas purge device assembly is included, and the temperature-controllable universal gas purge device assembly includes a gas circuit part and a circuit part. First, in the gas circuit part, the purge gas is introduced into the temperature-controllable universal gas purge device assembly by a stainless steel gas source pipe 8, and the stainless steel gas source pipe 8 is connected to the gate valve 1 through a ferrule-type terminal joint; after the purge gas passes through the gate valve 1, the gate valve 1 is also connected to the filter pressure reducing valve 2 through a ferrule-type terminal joint, and the filter pressure reducing valve 2 is subsequently connected to the ferrule-type stop valve and enters the electric heater inlet. Then the purge gas enters the rotor flowmeter 5, and then passes through the temperature control temperature switch 6, through the three-way purge gas outlet, and outputs through the universal stainless steel winding metal nozzle 15; the circuit part introduces a 220V power supply into this device by a power cable to provide power to the electric heater assembly 4 and the temperature control temperature switch 6.

[0043] When in use, common gases such as instrument air or self-produced polluted nitrogen of the device are used as purge gas and sent into the device through the stainless steel gas source pipe 8, the gate valve 1 is opened, and the gas source pressure is adjusted by adjusting the knob on the filter pressure reducing valve 2; the flow of the gas source is adjusted by adjusting the valve opening of the stop valve and observing the dial indication of the local rotor flowmeter 5; the 220V power supply is sent to the electric heater assembly 4 and the temperature control temperature switch 6 through the power cable, and the electric heater is continuously heated by changing the temperature setting value of the temperature switch and stops heating after the outlet temperature reaches the setting value, and then the outlet temperature is slowly reduced until it is reduced to the low point temperature set by the temperature switch, and the electric heater assembly 4 starts to reheat; the heated purge gas flows out of the electric heater, passes through the rotor flowmeter 5 and the temperature control temperature switch 6, and then passes through the universal stainless steel winding pipe 7 to the vicinity of the target to be heated and purged, and then adjusts the angle through the universal stainless steel winding metal nozzle 15 to purge and heat the target. If the distance is long, an insulation layer can be added outside the universal stainless steel winding pipe 7.

[0044] These modifications or improvements made on the basis of the present utility model without departing from the spirit of the present utility model all fall within the scope of protection required by the present utility model.

Claims

1. A device for preventing valves from freezing in low temperature working conditions, characterized in that: include: A stainless steel gas source pipe, the stainless steel gas source pipe is connected to a gate valve, the gate valve is connected to a filter pressure reducing valve, the filter pressure reducing valve is connected to a flow regulating stop valve, the flow regulating stop valve is connected to an electric heater assembly, the electric heater assembly is connected to a rotor flowmeter, the rotor flowmeter is connected to a universal stainless steel winding pipe, the universal stainless steel winding pipe is connected to a universal nozzle; the electric heater assembly is connected to a power circuit.

2. The device for preventing valves from freezing in low temperature conditions according to claim 1, characterized in that: The universal nozzle comprises a nozzle, and the nozzle is connected with a spherical locking nut; the spherical locking nut is connected with a universal stainless steel winding pipe.

3. A device for preventing valves from freezing in low temperature conditions according to claim 1 or 2, characterized in that: The electric heater assembly comprises a stainless steel heater shell, and air heating fins are arranged inside the stainless steel heater shell.

4. A device for preventing valves from freezing in low temperature conditions according to claim 1 or 2, characterized in that: An electric heater sealing box is provided at the connection between the electric heater assembly and the power circuit, and a graphite nickel wire packing is provided at the electric heater sealing box.

5. The device for preventing valves from freezing in low temperature conditions according to claim 4, characterized in that: The stainless steel gas source pipe is connected to the gate valve through a ferrule-type terminal joint; and the gate valve is connected to the filter pressure reducing valve through a ferrule-type terminal joint.

6. The device for preventing valves from freezing in low temperature conditions according to claim 3, characterized in that: The electric heater assembly is connected with a temperature control temperature switch, and the temperature control temperature switch is connected with a power supply circuit.

7. The device for preventing valves from freezing in low temperature conditions according to claim 1, characterized in that: It comprises a purge assembly shell, the gate valve is located inside the purge assembly shell, and the rotor flowmeter is located outside the purge assembly shell.

8. The device for preventing valves from freezing in low temperature conditions according to claim 7, characterized in that: The purge assembly housing includes an explosion-proof junction box; the stainless steel heater housing includes a seamless steel pipe.

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