A VCM conversion hot water tower closed circulation device

Abstract

The invention discloses a VCM conversion hot water tower closed circulation device, which relates to the technical field of circulation devices. The device comprises a hot water tower body and an emptying pipe, wherein the top of the hot water tower body is connected with the emptying pipe, the hot water tower body is communicated with a heat exchanger body, and further comprises an automatic emptying mechanism and an automatic nitrogen filling mechanism. The automatic emptying mechanism is provided with a passive control valve. When the internal air pressure of the hot water tower body is lower than the ambient air pressure, the passive control valve is closed, and the automatic nitrogen filling mechanism transports nitrogen into the hot water tower body until the internal air pressure is greater than the ambient air pressure; when the internal air pressure of the hot water tower body is lower than the ambient air pressure, the passive control valve closes the emptying pipe, so that no external air pressure in the emptying pipe enters the inside of the hot water tower body, and the automatic nitrogen filling mechanism transports nitrogen into the hot water tower body, so as to ensure that the air pressure in the hot water tower body is always higher than the external ambient air pressure, thereby ensuring the working stability of the hot water tower body.

Description

Technical Field

[0001] The invention relates to the technical field of circulation devices, in particular to a VCM conversion hot water tower closed circulation device. Background Art

[0002] As is known to all, polyvinyl chloride is a polymer formed by the polymerization of vinyl chloride monomers in the presence of initiators such as peroxides, azo compounds, or under the action of light or heat according to the free radical polymerization mechanism. The hot water tower process of the polyvinyl chloride production VCM conversion process is basically the same (e.g. Figure 2 As shown in the figure, the heat generated by the vinyl chloride synthesis reaction (the exothermic reaction of acetylene and hydrogen chloride under the action of high mercuric chloride catalyst) is forced to circulate the hot water back to the hot water tower. Since the upper part of the hot water tower is open (the upper part of the hot water tower is open because the exhaust pipe is directly connected to the external atmosphere), the hot water in the hot water tower in a gas-liquid mixed state flashes in the hot water tank and is directly discharged into the air in the form of steam (the steam takes away the heat in the hot water tower). After the hot water (or steam) is emptied, the hot water tower needs to be replenished with fresh desalted water to maintain the liquid level, which causes water resources. And serious waste of heat energy, and part of the hot water in the hot water tower is transported to the converter for vinyl chloride synthesis reaction through a hot water pump, so that the hot water is forced to circulate in the converter for vinyl chloride synthesis reaction and take away the reaction heat, and another part of the hot water in the hot water tower is sent to the lithium bromide unit of the refrigeration station through a hot water pump as a heating medium (recycling part of the heat energy) to produce 50C water, that is, there is a direct discharge to the atmosphere on the hot water tower, when the hot water tank is under pressure, the water vapor will be directly emptied, when the hot water tank level is low, the pure water supply valve will automatically open to add fresh desalted water to the hot water tank to maintain the liquid level. In addition to being used as a heat transfer medium for the converter and distillation, the water in the hot water tank is also partially sent to the heat exchanger of the lithium bromide unit as a heat source.

[0003] For example, the patent with the publication number CN201458993U and the publication date of May 14, 2010, entitled "Vinyl Chloride Synthesis Reaction Hot Water Natural Circulation Device", discloses a vinyl chloride synthesis reaction hot water natural circulation device, including a vapor-liquid separation device connected to the return water outlet of the converter, the vapor-liquid separation device is provided with a vapor outlet and a water outlet, the water outlet is connected to the upper water outlet of the converter, the vapor outlet is connected to the hot water tower, the upper water outlet of the converter is connected to the hot water tower through a hot water pump, and the vapor-liquid separation device is a horizontally arranged vapor-liquid separation pipeline, and the vapor-liquid separation pipeline is connected to a plurality of parallel converters. The patent adopts a vapor-liquid separation pipe to replace multiple vapor-liquid separation tanks, and the water supply and overflow pipelines also share one, which greatly saves investment and simplifies equipment layout and pipeline layout: realizes automatic control of water supply, simplifies operation, avoids overheating of the converter, improves the production capacity of a single converter, ensures the stable production of the vinyl chloride conversion device, and reduces the consumption of resources such as water and electricity, and realizes the maximization of production efficiency.

[0004] The shortcoming of the prior art is that an exhaust pipe is provided at the top of the hot water tower, so that the top of the hot water tower is always in an open state. When the external environmental pressure is greater than the air pressure inside the hot water tower, outside air will enter the hot water tower, and the entry of outside air will affect the use of the hot water tower. Summary of the invention

[0005] The purpose of the present invention is to provide a VCM conversion hot water tower closed circulation device to solve the technical problems in the related art.

[0006] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a VCM conversion hot water tower closed circulation device, comprising a hot water tower body and an emptying pipe, the top of the hot water tower body is connected to the emptying pipe, the hot water tower body is connected to the heat exchanger body, and also comprises an automatic emptying mechanism and an automatic nitrogen filling mechanism, the automatic emptying mechanism is provided with a passive control valve, when the internal air pressure of the hot water tower body is lower than the ambient air pressure, the passive control valve is closed, and the automatic nitrogen filling mechanism transports nitrogen into the hot water tower body until the internal air pressure is greater than the ambient air pressure.

[0007] In the above, the drain pipe is provided with a passive control valve, the passive control valve comprises a regulating pipe body, the middle part of the drain pipe is provided with a regulating pipe body, and the regulating pipe body is provided with a pressure control float;

[0008] When the water tank pressure in the hot water tower body is lower than the ambient pressure, the pressure control float seals the regulating pipe body to prevent the water vapor in the hot water tower body from being discharged from the regulating pipe body and the drain pipe;

[0009] When the water tank pressure in the hot water tower body is higher than the ambient air pressure, the pressure-control float floats in the regulating tube body, so that the hot water tower body is always in a slightly positive pressure condition, and the water vapor in the hot water tower body can be transported to the heat exchanger body.

[0010] As mentioned above, the hot water tower body is connected to a hot water pump body through a pipeline, and the hot water pump body is connected to a heat exchanger body through a pipe body.

[0011] As mentioned above, the hot water tower body is connected to a water seal tank via a return pipe, and the water seal tank is connected to a delivery pipe.

[0012] As mentioned above, the delivery pipe and the return pipe are each provided with an automatic control valve.

[0013] As mentioned above, the top end of the pressure-controlling float is connected with a positioning member for limiting the pressure-controlling float.

[0014] As mentioned above, the automatic nitrogen filling mechanism includes a nitrogen conveyor, and a square tube is connected to the portion of the exhaust pipe located between the top of the hot water tower body and the regulating pipe body, and a nitrogen conveyor is connected to the end of the square tube.

[0015] As mentioned above, a baffle is arranged in the square tube, and the baffle is divided into a first baffle and a second baffle, both of which are obtuse-angled plates, a second baffle is arranged on the side of the square tube close to the exhaust pipe, and a second baffle is arranged on the side of the square tube away from the exhaust pipe, the first baffle and the second baffle are combined into a "Z"-shaped plate, and an inverted trapezoidal groove is arranged between the first baffle and the second baffle.

[0016] As mentioned above, a valve cover is arranged in the trapezoidal groove between the first partition plate and the second partition plate.

[0017] As mentioned above, an air inlet valve is arranged on the square tube between the baffle and the nitrogen conveyor.

[0018] The beneficial effect of the present invention is that when the internal air pressure of the hot water tower body is lower than the ambient air pressure, the passive control valve closes the drain pipe, so that no external air pressure in the drain pipe enters the interior of the hot water tower body, and at the same time, the automatic nitrogen filling mechanism delivers nitrogen into the hot water tower body to increase the air pressure in the hot water tower body, thereby ensuring that the air pressure in the hot water tower body is always higher than the external ambient air pressure, thereby ensuring the stability of the operation of the hot water tower body. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0020] Figure 1 is a process flow chart of the present invention;

[0021] Figure 2 It is a process flow chart of the background technology in the present invention;

[0022] Figure 3 A schematic diagram of a partial cross-sectional structure of an embodiment provided by the present invention;

[0023] Figure 4 For the present invention Figure 3 A schematic diagram of a partially enlarged cross-sectional structure at L;

[0024] Figure 5 For the present invention Figure 3 A schematic diagram of a partially enlarged cross-sectional structure at M;

[0025] Figure 6 It is a partial cross-sectional structural schematic diagram of the motion state of the pressure-controlling float ball when the pressure inside the hot water tower body of the present invention is high;

[0026] Figure 7 A schematic diagram of a partial cross-sectional structure of a first viewing angle of yet another embodiment provided by the present invention;

[0027] Figure 8 A schematic diagram of a partial cross-sectional structure of a second viewing angle of yet another embodiment provided by the present invention;

[0028] Fig. 9 It is a schematic diagram of a partial cross-sectional structure of the valve cover of the present invention in an open state;

[0029] Fig.10 For the present invention Fig. 9 Schematic diagram of the locally enlarged cross-sectional structure at location N.

[0030] Description of reference numerals:

[0031] 1. Hot water tower body; 2. Drain pipe; 3. Heat exchanger body; 4. Adjustment pipe body; 5. Pressure control float; 6. Hot water pump body; 7. Delivery pipe; 8. Return pipe; 9. Water seal tank; 10. Square pipe; 11. Positioning piece; 13. Baffle; 131. First baffle; 132. Second baffle; 14. Trapezoidal groove; 15. Valve cover; 16. Inlet valve; 17. Slide; 18. Through groove; 19. U-shaped rod; 20. Sliding block; 21. First rack; 22 , straight plate; 23, positioning shaft; 24, transmission gear; 25, positioning plate; 26, transmission rod; 27, second rack; 28, first groove; 29, connecting rod; 30, first elastic member; 31, rubber rope; 32, driven floating ball; 33, counterweight ball; 34, tilting rod; 35, pin shaft; 36, second groove; 37, driven rod; 38, second elastic member; 39, arc groove; 40, card slot; 41, card block; 42, hollow groove; 43, auxiliary ball. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the technical solution of the present invention, Figure 1 To Attachment Fig.10 The present invention is further described in detail.

[0033] An embodiment provided by the present invention relates to a VCM conversion hot water tower closed circulation device, comprising a hot water tower body 1 and an emptying pipe 2, wherein the top of the hot water tower body 1 is connected to the emptying pipe 2, the hot water tower body 1 is connected to a heat exchanger body 3, and further comprises an automatic emptying mechanism and an automatic nitrogen filling mechanism, wherein a passive control valve is arranged on the automatic emptying mechanism, when the internal air pressure of the hot water tower body 1 is lower than the ambient air pressure, the passive control valve is closed, and the automatic nitrogen filling mechanism transports nitrogen into the hot water tower body 1 until the internal air pressure is greater than the ambient air pressure.

[0034] Specifically, vinyl chloride (VCM) conversion refers to the process of generating vinyl chloride through chemical reaction of hydrogen chloride and acetylene. Mixed dehydration is a key step in the VCM conversion process. The VCM conversion hot water tower (i.e., the hot water tower body 1) plays a vital role in the VCM conversion process. The hot water tower body 1 is a container for cooling and heating water. A hot water tank is arranged inside the hot water tower body 1. The drain pipe 2 is a pipe body inside the hot water tower body 1 for discharging water vapor. The heat exchanger body 3 is a hot water heat exchanger of a lithium bromide unit. The ambient air pressure is the air pressure of the atmosphere outside the hot water tower body 1. When the ambient air pressure is greater than the air pressure inside the hot water tower body 1, the air outside the hot water tower body 1 will enter the hot water tower body 1. The inside of the water tower body 1 affects the use of the hot water tower body 1, so that the pressure inside the hot water tower body 1 (that is, the atmospheric pressure) is required to be greater than the ambient air pressure outside the hot water tower body 1, so that the air outside the hot water tower body 1 will not affect the use of the inside of the hot water tower body 1. When the internal air pressure of the hot water tower body 1 is lower than the ambient air pressure, the passive control valve closes the drain pipe 2, so that no external air pressure in the drain pipe 2 enters the inside of the hot water tower body 1. At the same time, the automatic nitrogen filling mechanism transports nitrogen into the hot water tower body 1 to increase the air pressure inside the hot water tower body 1, ensuring that the air pressure inside the hot water tower body 1 is always higher than the external ambient air pressure, thereby ensuring the stability of the operation of the hot water tower body 1.

[0035] The shortcoming of the prior art is that an exhaust pipe 2 is provided at the top of the hot water tower, so that the top of the hot water tower is always in an open state. When the external environmental pressure is greater than the air pressure inside the hot water tower, external air will enter the hot water tower, and the entry of external air will affect the use of the hot water tower.

[0036] The beneficial effect of this embodiment is that when the internal air pressure of the hot water tower body 1 is lower than the ambient air pressure, the passive control valve closes the drain pipe 2, so that no external air pressure in the drain pipe 2 enters the hot water tower body 1, and at the same time, the automatic nitrogen filling mechanism delivers nitrogen into the hot water tower body 1 to increase the air pressure in the hot water tower body 1, ensuring that the air pressure in the hot water tower body 1 is always higher than the external ambient air pressure, thereby ensuring the stability of the operation of the hot water tower body 1.

[0037] Furthermore, a passive control valve is provided on the drain pipe 2, and the passive control valve includes a regulating pipe body 4. The regulating pipe body 4 is provided in the middle of the drain pipe 2, and a pressure control float 5 is provided in the regulating pipe body 4;

[0038] When the water tank pressure in the hot water tower body 1 is lower than the ambient pressure, the pressure control float 5 seals the regulating pipe body 4 to prevent the water vapor in the hot water tower body 1 from being discharged from the regulating pipe body 4 and the drain pipe 2;

[0039] When the water tank pressure in the hot water tower body 1 is higher than the ambient pressure, the pressure control float 5 floats in the regulating tube body 4, so that the hot water tower body 1 is always in a slightly positive pressure condition, and the water vapor in the hot water tower body 1 can be transported to the heat exchanger body 3.

[0040] Specifically, the hot water tower body 1 is always in a slightly positive pressure condition, that is, the air pressure in the hot water tower body 1 is always higher than the ambient air pressure, the regulating tube body 4 is a square tube body, the regulating tube body 4 is arranged in the middle of the drain pipe 2, the pressure control float 5 is a spherical structure made of rubber material, and the top of the pressure control float 5 is connected with a positioning member 11 for limiting the pressure control float 5, the positioning member 11 is slidably arranged on the top part of the drain pipe 2, the positioning member 11 will not seal the drain pipe 2, the positioning member 11 can ensure that the pressure control float 5 slides along the axial direction of the drain pipe 2, the positioning member 11 performs a certain positioning operation on the pressure control float 5, the hot water tower body 1 is connected with a hot water pump body 6 through a pipeline, the hot water pump body 6 is connected to the heat exchanger body 3 through a tube body, and the pressure control float 5 The overall mass is adapted to the outlet pressure generated when the water vapor in the hot water tower body 1 is discharged, that is, when the water vapor in the hot water tower body 1 is discharged, a certain pressure is generated in the hot water tower body 1, that is, the pressure of the hot water tower body 1 is normally controlled within 17kPa-23kPa, and the interlocking index (that is, the pressure when the passive control valve is opened and the pressure when the nitrogen is delivered) is normally controlled between 15kPa-25kPa, that is, when the pressure in the hot water tower body 1 and the drain pipe 2 is lower than 15kPa, the overall mass of the pressure control float 5 seals the regulating pipe body 4, so that the regulating pipe body 4 is in a closed state, and when the pressure in the hot water tower body 1 and the drain pipe 2 is higher than 25kPa, the vapor pressure generated by the water vapor pushes the pressure control float 5 to float upward. The water vapor will generate a driving force when it rises, and this driving force acts on the pressure-controlling float 5, causing the pressure-controlling float 5 to float upward, so that the pressure-controlling float 5 and the regulating tube body 4 are separated from each other, so that the regulating tube body 4 is in an open state, and the pressure in the hot water tower body 1 is relieved to ensure that the hot water tank is always in a slightly positive pressure condition. Since the top of the pressure-controlling float 5 is connected to a positioning member 11 for limiting the pressure-controlling float 5, the positioning member 11 is used to limit the pressure-controlling float 5, so that the pressure-controlling float 5 can only slide along the axial direction of the drain pipe 2, and the hot water tower body 1 is connected to a hot water pump body 6 through a pipeline, and the hot water pump body 6 is connected to the heat exchanger body 3 through a pipe body, and the hot water in the hot water tower body 1 can pass through the hot water pump body 6. The hot water in the hot water tower body 1 is transported to the heat exchanger body 3 to realize the recycling of the hot water in the hot water tower body 1. When the hot water tower body 1 is working, water vapor is discharged from the exhaust pipe 2 at the top of the hot water tower body 1 to impact the pressure control float 5, and the regulating pipe body 4 is opened and closed by the pressure control float 5. When the water tank pressure in the hot water tower body 1 is lower than the ambient pressure, the pressure control float 5 seals the regulating pipe body 4 under the action of its own gravity, so that the regulating pipe body 4 is closed. When the water tank pressure in the hot water tower body 1 is higher than the ambient pressure, the pressure control float 5 is impacted by the water vapor in the hot water tower body 1, so that the pressure control float 5 floats in the regulating pipe body 4, so that the regulating pipe body 4 is opened, so that the hot water tower body 1 is always in a slightly positive pressure condition.Realize the rational use of hot water and water vapor in the hot water tower body 1 and reduce the waste of water resources.

[0041] Preferably, the hot water tower body 1 is connected to a water seal tank 9 via a return pipe 8, and the water seal tank 9 is connected to a delivery pipe 7; and an automatic control valve is provided on each of the delivery pipe 7 and the return pipe 8.

[0042] Specifically, in order to ensure that the liquid level inside the hot water tower body 1 is within a certain range and to deliver heat to the lithium bromide unit (i.e., the heat exchanger body 3) to the maximum extent, the automatic control valves on the delivery pipe 7 and the return pipe 8 are mutually related to the liquid level of the hot water tank inside the hot water tower body 1 and the temperature inside the hot water tower body 1, so that the liquid level of the hot water tank inside the hot water tower body 1 remains relatively stable. At the same time, in order to avoid the failure of the automatic control valves on the delivery pipe 7 and the return pipe 8, which may lead to overpressure of the hot water tank inside the hot water tower body 1 and cause safety accidents, a safety water seal is provided on the delivery pipe 7 and the return pipe 8. The safety water seal has the ability to adjust air intake and drainage. When the water level is too low, the system will automatically replenish water; when the water level is normal, the gas will be discharged above the water surface to maintain the stability of the system. The setting of the safety water seal is common knowledge in the art and will not be repeated.

[0043] In another embodiment provided by the present invention, the automatic nitrogen filling mechanism includes a nitrogen conveyor, a square tube 10 is connected to the portion of the emptying pipe 2 between the top of the hot water tower body 1 and the regulating pipe body 4, and a nitrogen conveyor is connected to the end of the square tube 10; a baffle 13 is arranged in the square tube 10, and the baffle 13 is divided into a first baffle 131 and a second baffle 132, both of which are obtuse plates, a second baffle 132 is arranged on the side close to the emptying pipe 2 in the square tube 10, a first baffle 131 is arranged on the side away from the emptying pipe 2 in the square tube 10, the first baffle 131 and the second baffle 132 are combined into a "Z"-shaped plate, an inverted trapezoidal groove 14 is arranged between the first baffle 131 and the second baffle 132; a valve cover 15 is arranged in the trapezoidal groove 14 between the first baffle 131 and the second baffle 132; an air intake valve 16 is arranged on the square tube 10 between the baffle 13 and the nitrogen conveyor.

[0044] Specifically, the square tube 10 is a tube body with a square cross-section (such as a rectangular tube or a square tube), and the nitrogen conveyor is a device for conveying nitrogen. The nitrogen conveyor can convey nitrogen to the hot water tower body 1 through the square tube 10. It is common knowledge in the field that the nitrogen conveyor conveys nitrogen, and it will not be repeated. By arranging the nitrogen conveyor and the square tube 10 on the exhaust pipe 2, the nitrogen conveyor conveys nitrogen to the hot water tower body 1 through the square tube 10, and the pressure in the hot water tower body 1 is adjusted by conveying nitrogen through the nitrogen conveyor. When the pressure in the hot water tower body 1 is lower than 15kPa, the air inlet valve 16 is opened, and at the same time, the valve cover 15 and the trapezoidal groove 14 between the first partition 131 and the second partition 132 are separated from each other, so that the valve cover 15 opens the trapezoidal groove 14 between the first partition 131 and the second partition 132, and the nitrogen conveyor conveys nitrogen from the first partition 131 and the first partition 132 through the square tube 10. 131 is transported into the hot water tower body 1 to increase the pressure in the hot water tower body 1; when the pressure in the hot water tower body 1 is higher than 25 kPa (that is, after a certain period of nitrogen transportation, the pressure in the hot water tower body 1 is higher than 25 kPa), the valve cover 15 and the trapezoidal groove 14 between the first partition 131 and the second partition 132 abut against each other, so that the valve cover 15 seals the trapezoidal groove 14 between the first partition 131 and the second partition 132, so that nitrogen is no longer transported in the square tube 10, and the valve cover 15 and the trapezoidal groove 14 between the first partition 131 and the second partition 132 abut against or disengage from each other through the pressure change in the hot water tower body 1, thereby opening and closing the square tube 10, that is, the opening and closing of the square tube 10 are adapted to the pressure in the hot water tower body 1, so as to realize automatic adjustment of the pressure in the hot water tower body 1.

[0045] In another embodiment provided by the present invention, an auxiliary unit is provided on the regulating tube body 4, and the auxiliary unit is used to drive the opening and closing of the valve cover 15; a slide groove 17 is provided on one side wall of the regulating tube body 4, and a through groove 18 is provided between the inner wall at the top end of the slide groove 17 and the top end of the regulating tube body 4, and an inverted U-shaped rod 19 is slidably installed in the slide groove 17, and the U-shaped rod 19 passes through the bottom end of the through groove 18 and is connected to a sliding block 20, and the sliding block 20 is slidably installed in the slide groove 17, and the sliding block 20 is connected to the outer wall of the pressure control float 5, and a first rack 21 is provided at one end of the U-shaped rod 19 located on the outside of the regulating tube body 4, and two straight plates 22 are symmetrically provided on the outer wall of the regulating tube body 4, and a positioning A transmission gear 24 is rotatably provided on the positioning shaft 23, a positioning plate 25 is provided on the outer wall of the adjusting tube body 4, a transmission rod 26 is slidably provided on the positioning plate 25, a second rack 27 is provided on the transmission rod 26, the first rack 21 and the second rack 27 are both meshed with the transmission gear 24, that is, the first rack 21 and the second rack 27 are respectively located on both sides of the transmission gear 24, a first groove 28 is provided at the bottom end of the transmission rod 26, a connecting rod 29 is slidably installed in the first groove 28, the connecting rod 29 and the first groove 28 are connected by a first elastic member 30, the connecting rod 29 is slidably installed in the square tube 10, and the bottom end of the connecting rod 29 passes through the top end of the square tube 10 and is rotatably connected to the valve cover 15.

[0046] Specifically, when the pressure in the hot water tower body 1 is higher than 25 kPa (that is, after a certain period of nitrogen delivery, the pressure in the hot water tower body 1 is higher than 25 kPa), the valve cover 15 and the trapezoidal groove 14 between the first partition 131 and the second partition 132 abut against each other, so that the valve cover 15 seals the trapezoidal groove 14 between the first partition 131 and the second partition 132, so that nitrogen is no longer delivered in the square tube 10. At this time, since the pressure in the hot water tower body 1 is higher than 25 kPa, the vapor pressure generated by the water vapor pushes the pressure control float 5 to the top of the regulating tube body 4. The pressure control float 5 and the regulating tube body 4 are disengaged from each other, so that the pressure control float 5 opens the regulating tube body 4. At the same time, the pressure control float 5 drives the sliding block 20 to slide toward the top of the regulating tube body 4 along the track of the slide groove 17. The sliding block 20 drives the U-shaped rod 19 to slide toward the top of the regulating tube body 4. The U-shaped rod 19 drives the first rack 21 to move toward the top of the regulating tube body 4. Since the first rack 21 and the transmission gear 24 are meshed with each other, and the second rack 27 and the transmission gear 24 are meshed with each other, during the movement of the first rack 21 toward the top of the regulating tube body 4, the first rack The transmission gear 21 drives the transmission gear 24 to rotate around the positioning shaft 23, and the transmission gear 24 drives the second rack 27 to move, so that the second rack 27 drives the transmission rod 26 to move toward the bottom end of the regulating tube body 4 on the positioning plate 25, and the transmission rod 26 drives the connecting rod 29 to move toward the bottom end of the regulating tube body 4 through the first elastic member 30 (the first elastic member 30 is a component that can be telescopically reset, preferably a spring), so that the connecting rod 29 pushes the valve cover 15 and the trapezoidal groove 14 to abut against each other, so that the valve cover 15 can abut the trapezoidal groove 14 between the first partition plate 131 and the second partition plate 132. The square tube 10 is sealed so that nitrogen is no longer transported. Due to the certain elasticity of the first elastic member 30, when the pressure in the hot water tower body 1 is higher than 25 kPa or the pressure in the hot water tower body 1 is higher, the pressure-controlling float 5 moves higher toward the top of the regulating tube body 4, and the valve cover 15 is pressed more by the connecting rod 29. The pressure in the hot water tower body 1 is higher, and the nitrogen conveyor transports nitrogen into the hot water tower body 1 to increase the pressure in the hot water tower body 1. Instead, the valve cover 15 is closed by the vapor pressure generated by the water vapor in the hot water tower body 1.

[0047] When the pressure-controlling float 5 is stuck at the port of the regulating tube body 4, that is, after being used for a long time or aging, the pressure-controlling float 5 may cause a certain amount of sticking to the regulating tube body 4, so that when the pressure in the hot water tower body 1 is higher than 25 kPa, the pressure-controlling float 5 will not open the regulating tube body 4 and the drain pipe 2. At this time, the air intake of the nitrogen conveyor can be increased so that the nitrogen conveyed by the nitrogen conveyor will flush the valve cover 15 open, thereby increasing the pressure in the hot water tower body 1, thereby flushing the pressure-controlling float 5 out from the pipe port of the regulating tube body 4, thereby solving the problem of the pressure-controlling float 5 being stuck.

[0048] In another embodiment provided by the present invention, the bottom end of the pressure-control float 5 is connected to a rubber rope 31, the end of the rubber rope 31 is connected to a driven float 32, a counterweight ball 33 is loaded in the driven float 32, and a tilting rod 34 is connected to the side wall of the valve cover 15, the tilting rod 34 and the driven float 32 are arranged in cooperation with each other, and the side of the tilting rod 34 close to the valve cover 15 is rotatably arranged in the square tube 10 through a pin shaft 35, and the end of the tilting rod 34 close to the valve cover 15 is a telescopic structure. Preferably, a second groove 36 is opened at the end of the tilting rod 34 close to the valve cover 15, and a driven rod 37 is slidably arranged in the second groove 36, the driven rod 37 and the inner wall of the second groove 36 are connected by a second elastic member 38, and the driven rod 37 is connected to the valve cover 15.

[0049] Specifically, the driven float 32 is a sphere with a hollow center, and a plurality of counterweight balls 33 are arranged inside the driven float 32. The number of the counterweight balls 33 can be selected according to the pressure requirements. When the pressure in the hot water tower body 1 is lower than 15 kPa, under the action of the overall mass of the pressure-controlling float 5 (that is, the mass of the pressure-controlling float 5, the rubber rope 31, the driven float 32 and the counterweight balls 33 added together), the pressure-controlling float 5 seals the regulating tube body 4, so that the regulating tube body 4 is in a closed state. However, when the pressure in the hot water tower body 1 is lower than 15 kPa, the vapor pressure generated in the hot water tower body 1 cannot make the driven float 32 float. Instead, under the action of their own weight, the driven float 32 and the counterweight balls 33 pull the rubber rope 31 (the rubber rope 31 is a rope made of rubber material. Since the rubber rope 31 is made of rubber material, The first and second elastic members 38 are provided to move the valve cover 15 to the top of the square tube 10, so that the valve cover 15 is disengaged from the trapezoidal groove 14 between the first and second partitions 131 and 132, thereby realizing the opening of the square tube 10 (such as the valve cover 15). Fig. 9 and Fig.10As shown), the square tube 10 transports nitrogen into the hot water tower body 1, thereby increasing the pressure in the hot water tower body 1. Through the extension and retraction of the driven rod 37 and the second elastic member 38 on the tilting rod 34, the tilting rod 34 can adapt to the length change of the valve cover 15 when it rotates, and there may be a slight shake of the driven rod 37 in the second groove 36, so that the driven rod 37 can have a certain shake when pushing the valve cover 15 to open, so that the tilting rod 34 and the driven rod 37 can be more adapted to the opening of the valve cover 15.

[0050] When the pressure in the hot water tower body 1 is higher than 25kPa (that is, after a certain period of nitrogen delivery, the pressure in the hot water tower body 1 is higher than 25kPa), the vapor pressure generated by the water vapor pushes the pressure control float 5 to move toward the top of the regulating tube body 4, so that the pressure control float 5 and the regulating tube body 4 are separated from each other, so that the pressure control float 5 opens the regulating tube body 4. At the same time, the pressure control float 5 drives the first rack 21 to move toward the top of the regulating tube body 4 through the sliding block 20 and the U-shaped rod 19. The first rack 21 is driven by the transmission gear 24 drives the second rack 27, the transmission rod 26 and the connecting rod 29 to push the valve cover 15 and the trapezoidal groove 14 to abut against each other, so that the valve cover 15 seals the trapezoidal groove 14 between the first partition plate 131 and the second partition plate 132, so that nitrogen is no longer transported in the square tube 10, that is, through the mutual cooperation between the driven float 32 and the pressure control float 5 and the vapor pressure generated by the water vapor in the hot water tower body 1, the pressure in the hot water tower body 1 is automatically controlled, so that the hot water tower body 1 is always in a slightly positive pressure condition.

[0051] In another embodiment provided by the present invention, an arc groove 39 is provided on the inner wall of the drain pipe 2, and the center of the arc groove 39 coincides with the center of the pin shaft 35, and the end of the lift rod 34 is slidably arranged in the arc groove 39, and a card groove 40 is provided at the bottom end of the arc groove 39, and a card block 41 is provided at the end of the lift rod 34 away from the valve cover 15, and the card block 41 and the card groove 40 are plugged into each other, and a hollow groove 42 is provided on the side of the lift rod 34 away from the valve cover 15 and close to the pin shaft 35, and a plurality of auxiliary balls 43 are evenly arranged in the hollow groove 42.

[0052] Specifically, the card slot 40 is a truncated cone-shaped slot body, the card block 41 is a truncated cone-shaped column, and the card block 41 is made of rubber material. When the driven floating ball 32 and the counterweight ball 33 collide with the tilting rod 34, the side of the tilting rod 34 close to the valve cover 15 is rotated and arranged in the square tube 10 through the pin shaft 35, so that the end of the tilting rod 34 that collides with the driven floating ball 32 tilts downward, but this way of opening the valve cover 15 is unstable. In this embodiment, the tilting generated when the tilting rod 34 collides with the driven floating ball 32 drives the card The block 41 is inserted into the slot 40. Since the slot 40 is a truncated cone-shaped slot body and the block 41 is a truncated cone-shaped column, the block 41 has a higher stability when inserted into the slot 40. In addition, the hollow groove 42 of the tilting rod 34 tilts downward toward the end close to the arc groove 39, so that the auxiliary ball 43 in the hollow groove 42 rolls toward the end close to the arc groove 39 in the hollow groove 42, so that the auxiliary ball 43 assists the tilting of the tilting rod 34, thereby achieving the stability of the tilting of the tilting rod 34 to drive the valve cover 15 to open the trapezoidal groove 14.

[0053] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A VCM conversion hot water tower closed circulation device, comprising a hot water tower body and an exhaust pipe, wherein the top of the hot water tower body is connected to the exhaust pipe, and the hot water tower body is connected to the heat exchanger body, characterized in that: It also includes an automatic emptying mechanism and an automatic nitrogen filling mechanism, wherein the automatic emptying mechanism is provided with a passive control valve, and when the internal air pressure of the hot water tower body is lower than the ambient air pressure, the passive control valve is closed, and the automatic nitrogen filling mechanism delivers nitrogen into the hot water tower body until the internal air pressure is higher than the ambient air pressure; The automatic nitrogen filling mechanism includes a nitrogen conveyor, and a square tube is connected to the portion of the exhaust pipe located between the top of the hot water tower body and the regulating pipe body, and a nitrogen conveyor is connected to the end of the square tube; A baffle is arranged in the square tube, and the baffle is divided into a first baffle and a second baffle. The first baffle and the second baffle are both obtuse-angled plates. A second baffle is arranged on the side of the square tube close to the emptying pipe, and a second baffle is arranged on the side of the square tube away from the emptying pipe. The first baffle and the second baffle are combined into a "Z"-shaped plate, and an inverted trapezoidal groove is arranged between the first baffle and the second baffle; A valve cover is provided in the trapezoidal groove between the first partition plate and the second partition plate; An air inlet valve is arranged on the square tube between the baffle and the nitrogen conveyor.

2. A VCM conversion hot water tower closed circulation device according to claim 1, characterized in that: A passive control valve is arranged on the drain pipe, and the passive control valve includes a regulating pipe body. The regulating pipe body is arranged in the middle of the drain pipe, and a pressure-controlling float is arranged in the regulating pipe body. When the water tank pressure in the hot water tower body is lower than the ambient pressure, the pressure-controlling float seals the regulating pipe body to prevent the water vapor in the hot water tower body from being discharged from the regulating pipe body and the drain pipe. When the water tank pressure in the hot water tower body is higher than the ambient pressure, the pressure-controlling float floats in the regulating pipe body, so that the hot water tower body is always in a slightly positive pressure condition, and the water vapor in the hot water tower body can be transported to the heat exchanger body.

3. A VCM conversion hot water tower closed circulation device according to claim 1, characterized in that: The hot water tower body is connected with a hot water pump body through a pipeline, and the hot water pump body is connected with a heat exchanger body through a pipe body.

4. A VCM conversion hot water tower closed circulation device according to claim 1, characterized in that: The hot water tower body is connected with a water seal tank through a return pipe, and the water seal tank is connected with a delivery pipe.

5. A VCM conversion hot water tower closed circulation device according to claim 4, characterized in that: The delivery pipe and the return pipe are each provided with an automatic control valve.

6. A VCM conversion hot water tower closed circulation device according to claim 2, characterized in that: The top end of the pressure-controlling float is connected with a positioning piece for limiting the pressure-controlling float.

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