CN112762735B - Heat exchange system of heat exchanger and control method - Google Patents

Abstract

The application relates to a heat exchange system of a heat exchanger, which comprises a plurality of floating coil pipes, a first heat exchange pipe, a second heat exchange pipe, a liquid level detector, a control valve and a control device, wherein the floating coil pipes are arranged in a tank body; the control valves are arranged on the inlets or outlets of the floating coil pipes respectively and used for controlling the on-off of the heat medium; the liquid level detector is used for detecting the liquid level of liquid in the tank body, the liquid level detector outputs a trigger signal when the liquid in the tank body reaches a set liquid level when one floating coil pipe is immersed, and the control device is connected with the liquid level detector and the control valve and used for receiving and responding to the trigger signal to control the control valve corresponding to the floating coil pipe to be opened. This application has the effect that promotes heat transfer speed in order to promote heat exchange efficiency.

Description

Heat exchange system of heat exchanger and control method

Technical Field

The application relates to the field of heat exchangers, in particular to a heat exchange system of a heat exchanger and a control method.

Background

The heat exchanger is a device which transfers part of heat of hot fluid to cold fluid to realize heat energy transfer, and is also called as a heat exchanger. The heat exchanger plays an important role in chemical industry, petroleum industry, power industry, food industry and other industrial production.

The heat exchanger generally includes a tank body, a heat exchange pipeline, a transfer pump and a valve system, wherein the heat exchange pipeline, the transfer pump and the valve system are arranged in the tank body, the tank body is used for storing liquid to be heat exchanged, the heat exchange pipeline is in contact with the liquid in the tank body, and the heat exchange pipeline is used for introducing heat media, such as steam, hot water and the like. The valve system is used for controlling the on-off of the heat medium, water inlet and outlet or controlling the flow of liquid and the like, and the transfer pump is used for realizing the continuous transfer of the heat medium, so that the continuous heat exchange is carried out in the tank body.

In order to prevent the heat exchange pipelines from overheating and aging at an accelerated speed, the conventional heat exchanger generally controls a heat medium to be introduced into the heat exchange pipelines for heat exchange through a valve system after liquid completely submerges all the heat exchange pipelines.

Aiming at the related technologies, the inventor thinks that the defects of low heat exchange speed and low heat exchange efficiency caused by the fact that the heat exchange medium is introduced into the heat exchanger only after the liquid completely submerges the heat exchange pipeline exist in the prior heat exchanger.

Disclosure of Invention

First aspect, in order to promote heat transfer speed, promote heat exchange efficiency, this application provides a heat exchange system of heat exchanger.

The application provides a heat exchange system of heat exchanger adopts following technical scheme:

a heat exchange system of a heat exchanger comprises a plurality of floating coil pipes, a first heat exchange pipe, a second heat exchange pipe, a liquid level detector, a control valve and a control device, wherein the floating coil pipes are arranged in a tank body, the floating coil pipes are distributed at intervals along the height direction of the tank body, the inlet of each floating coil pipe is communicated with the first heat exchange pipe, and the outlet of each floating coil pipe is communicated with the second heat exchange pipe;

the control valves are arranged on the inlets or outlets of the floating coil pipes respectively and used for controlling the on-off of the heat medium; the liquid level detector is used for detecting the liquid level of liquid in the tank body, the liquid level detector outputs a trigger signal when the liquid in the tank body reaches a set liquid level when one floating coil pipe is immersed, and the control device is connected with the liquid level detector and the control valve and used for receiving and responding to the trigger signal to control the control valve corresponding to the floating coil pipe to be opened.

Through adopting above-mentioned technical scheme, liquid level detector is used for detecting the liquid level height of the internal liquid of jar, when liquid injection jar was internal, liquid level height risees gradually and each floating coil pipe of gradual submergence, when a certain floating coil pipe of liquid submergence, liquid level detector detects the liquid level and reaches the settlement liquid level of this floating coil pipe of submergence, liquid level detector output trigger signal this moment, trigger signal can be pulse signal, and controlling means controls the control valve promptly after receiving trigger signal and opens, make the heat medium in the first heat exchange tube let in this floating coil pipe and derive through the second heat exchange tube, floating coil pipe heats or cooling process the internal liquid of jar. During the period, every time one floating coil pipe is immersed in the liquid level, one control valve is opened, so that the floating coil pipe immersed by the liquid enters a working state, on one hand, the floating coil pipe can be prevented from being overheated and aged, on the other hand, the heat exchange speed can be increased, and the heat exchange efficiency is improved.

Preferably, a section of the first heat exchange tube, which is located outside the tank body, is provided with a main valve, the main valve is connected with a control device, and the control device controls the main valve to be opened when the liquid level detector outputs a first trigger signal.

Through adopting above-mentioned technical scheme, when liquid level detector output triggering signal for the first time, when the unsteady coil pipe of liquid submergence bottommost promptly, the main valve is opened, and leading-in first heat exchange tube of heat medium this moment, the leading-in unsteady coil pipe of bottommost of heat medium in the first heat exchange tube and begin the heat transfer operation, and the heat of effluvium through first heat exchange tube preheats the jar internal in advance, improves heat exchange efficiency.

Preferably, a section of the first heat exchange tube, which is located outside the tank body, is provided with a delivery pump, the delivery pump is connected with a control device, the control device is used for controlling the power of the delivery pump according to the accumulated times of the trigger signals, and the higher the accumulated times of the trigger signals is, the higher the power of the delivery pump is.

Through adopting above-mentioned technical scheme, triggering signal's accumulative total number of times indicates that the coiled pipe that floats is launched more, and the total flux increase of each coiled pipe that floats this moment, and the internal liquid level of jar body risees this moment, and thermal demand is big more this moment, consequently need promote the power of delivery pump for hydraulic pressure increase in the first heat exchanger, make the flow increase of heat medium, make the heat of the coiled pipe output that floats this moment increase, thereby promote heat exchange efficiency. And the mode that the power increases progressively can reduce the internal pressure that the floating coil pipe received when the coil pipe that floats of beginning a small amount, avoids floating coil pipe to burst or reveal and cause the potential safety hazard.

Preferably, the floating coil pipe is circular, the floating coil pipes are coaxially distributed, a circulating impeller and a driving piece connected with the circulating impeller are arranged in the tank body, and the rotating axis of the circulating impeller coincides with the central axis of the floating coil pipe.

Through adopting above-mentioned technical scheme, the coil pipe that floats is the ring form to this makes the thermal medium be the annular and carries, and the produced centrifugal force of thermal medium transportation makes the coil pipe wall that floats produce high-frequency vibration, with this laminar flow phenomenon that reduces jar internal liquid, produces turbulent phenomenon, makes liquid produce and scratches, thereby promotes the heat exchange efficiency of liquid. The existence of the circulation impeller can change the flowing direction of water flow, so that the nearby water flow passes through the channel at the center of the floating coil pipe, the heat exchange dead zone is reduced, and the heat exchange efficiency is improved.

Preferably, the circulation impeller is provided with a plurality of circulation impellers which are respectively arranged between adjacent floating coil pipes and are used for pumping liquid below the circulation impellers to the upper side of the circulation impellers, and the pumping directions of the circulation impellers are consistent.

By adopting the technical scheme, low-temperature liquid is generally introduced from the bottom, and high-temperature liquid generally flows out from the top, so that the low-temperature liquid at the bottom of the tank body can be converged from the center of the floating coil pipes and flows out from the gaps of the floating coil pipes and the tops of the floating coil pipes by the aid of the circulating impeller, circulation is formed, water circulation is formed, and heat exchange efficiency is improved.

Preferably, the eccentric end of the blade of the circulation impeller is provided with a spoiler, and the spoiler extends to between the pipes of the adjacent floating coils.

Through adopting above-mentioned technical scheme, because the clearance between the adjacent coil pipe that floats is the region that heat exchange efficiency is the highest, and the setting of spoiler is used for accelerating the velocity of flow of the water between the adjacent coil pipe that floats to this strengthens turbulent phenomenon, thereby promotes heat exchange efficiency.

Preferably, a connecting assembly is arranged between adjacent circulation impellers, and the circulation impellers are detachably connected through the connecting assembly.

By adopting the technical scheme, the replacement of the circulation impeller can be realized by disassembling the circulation impeller, so that the floating coil pipe descaling is convenient to carry out, and the maintenance work of the floating coil pipe and the circulation impeller is carried out.

Preferably, the circulation impeller includes the pivot of being connected with the driving piece, coupling assembling including set up in the slider of pivot bottom, the bar groove has been seted up on the pivot top, the slider of circulation impeller is used for sliding with the bar groove of another circulation impeller that its below is adjacent and is connected, just the maximum width of bar inslot space is greater than its opening width, the bottom in bar groove is seted up and is supplied slider male mounting groove.

By adopting the technical scheme, when the slide block at the bottom end of the rotating shaft of the previous circulating impeller is inserted into the mounting groove at the top end of the rotating shaft of the next circulating impeller, the slide block can slide along the strip-shaped groove, at the moment, the maximum width of the space in the strip-shaped groove is larger than the opening width of the strip-shaped groove, and the slide block can be limited to be separated from the strip-shaped groove under the self-weight action of the circulating impeller, so that the connection of the adjacent circulating impellers is realized, and the assembly and disassembly are convenient.

Preferably, the bottom end of the rotating shaft is provided with a screw hole, the top end of the rotating shaft is provided with a through hole, the through hole is opposite to the screw hole when the sliding block slides to be separated from the mounting groove and enters the strip-shaped groove, and a bolt in threaded connection with the screw hole is arranged in the through hole in a penetrating manner.

By adopting the technical scheme, the bolts penetrating through the through holes and in threaded connection with the screw holes are used for fixing the two adjacent circulating impellers, so that the shaking of the circulating impellers is reduced, the floating coil pipe is prevented from being damaged due to collision with the floating coil pipe when the circulating impellers shake, and the service life is prolonged.

In a second aspect, in order to increase the heat exchange speed and increase the heat exchange efficiency, the application provides a control method, which adopts the following technical scheme:

a control method of a heat exchange system applying the heat exchanger comprises the following steps,

collecting the height value of each floating coil relative to the bottom wall of the tank body;

calculating a plurality of set liquid level values according to the height values of the floating coil pipes;

collecting the current liquid level value of the tank body;

outputting an operation instruction according to the current liquid level value and the set liquid level value;

and when the current liquid level value exceeds the set liquid level value corresponding to the current floating coil pipe, outputting an operation instruction corresponding to opening the control valve of the current floating coil pipe.

Through adopting above-mentioned technical scheme, can obtain required setting for the liquid level value when the unsteady coil pipe of liquid submergence through the height value of gathering the relative jar body diapire of each unsteady coil pipe, and can judge whether the liquid level reaches the height of the current unsteady coil pipe of submergence through the size of contrast liquid level value with setting for the liquid level value to this realizes the heat transfer in advance of liquid according to the switching of the accurate regulation and control valve of the injection volume of liquid, promotes heat exchange efficiency.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the liquid level detector detects whether the liquid level reaches a set liquid level for immersing a certain floating coil pipe, if so, a primary trigger signal is output, the control device responds and controls the corresponding control valve to open, so that a heat medium is introduced into the floating coil pipe to heat or cool the liquid in the tank body, and the control device opens one control valve every time the liquid immerses one floating coil pipe, so that the floating coil pipes immersed by the liquid enter a working state, the heat exchange speed is increased, and the heat exchange efficiency is improved;

2. the more the accumulated times of the trigger signals are, the more the starting number of the floating coil is, so that the power of the delivery pump needs to be increased, the hydraulic pressure in the first heat exchange pipe is increased, the flow of a heat medium is increased, the heat output by the floating coil is increased at the moment, the heat exchange efficiency is improved, the internal pressure of the floating coil at the beginning is reduced, and the potential safety hazard is reduced;

3. the low-temperature liquid is generally introduced from the bottom, and the high-temperature liquid generally flows out from the top, so that the low-temperature liquid at the bottom of the tank body can be converged from the center of the floating coil pipes and flows out from the gaps of the floating coil pipes and the tops of the floating coil pipes due to the existence of the circulating impeller, circulating current is formed, water circulation is formed, and the heat exchange efficiency is improved.

Drawings

Fig. 1 is a schematic view of the overall structure of a heat exchange system of a heat exchanger according to an embodiment of the present application.

Fig. 2 is a partial structural schematic view of a heat exchange system of a heat exchanger according to an embodiment of the present application, mainly showing a floating coil.

Fig. 3 is a partial structural schematic view of a heat exchange system of a heat exchanger according to an embodiment of the present application, mainly showing a connection assembly.

Fig. 4 is a partial structural schematic diagram of a heat exchange system of a heat exchanger according to an embodiment of the present application, mainly showing a slider.

Fig. 5 is a method flowchart of a control method according to an embodiment of the present application.

Description of reference numerals: 1. a tank body; 11. an installation port; 12. installing a cover; 13. a liquid inlet pipe; 14. a liquid outlet pipe; 2. a floating coil pipe; 21. a branch pipe; 22. an inlet pipe; 23. an outlet pipe; 24. a first heat exchange tube; 25. a second heat exchange tube; 3. a liquid level detector; 31. a control valve; 32. a main valve; 33. a delivery pump; 4. a circulating impeller; 41. a drive member; 42. a spoiler; 5. a connecting assembly; 51. a rotating shaft; 52. a strip-shaped groove; 53. mounting grooves; 54. a screw hole; 55. a through hole; 56. a slider; 57. and (4) bolts.

Detailed Description

The present application is described in further detail below with reference to the accompanying drawings.

The embodiment of the application discloses a heat exchange system of a heat exchanger. The heat exchange system of the present application may perform a heating or cooling process on a liquid, and only the heating process is described with emphasis in this embodiment. Referring to fig. 1 and 2, the heat exchange system of the heat exchanger comprises a tank body 1, a floating coil 2, a first heat exchange pipe 24, a second heat exchange pipe 25, a liquid inlet pipe 13 and a liquid outlet pipe 14. The liquid inlet pipe 13 is communicated with the bottom of the tank body 1 and is used for guiding low-temperature liquid such as cold water into the tank body 1, and the heat medium is led into the floating coil 2 through the first heat exchange pipe 24 and then is output from the second heat exchange pipe 25 to circulate the heat medium. The floating coil 2 is made of copper materials with strong heat conductivity, heat exchange between a heat medium and liquid in the tank body 1 is realized, and the heated liquid is led out from the liquid outlet pipe 14 communicated with the top of the tank body 1, so that a heat exchange function is realized.

The circular mounting hole 11 is opened at the top of the tank body 1, the mounting hole 11 is used for facilitating the placement of the floating coil pipe 2, the mounting hole 11 is covered with a mounting cover 12, and the mounting cover 12 is fixed with the tank body 1 through screws. The first heat exchange pipe 24 and the second heat exchange pipe 25 both penetrate through the mounting cover 12 and are communicated with the floating coil 2. The floating coil pipe 2 is wholly in a circular ring shape, and comprises a plurality of branch pipes 21 which are distributed spirally, the spiral radius of each branch pipe 21 is increased in sequence along the direction of the center of the floating coil pipe 2, an inlet pipe 22 is communicated with one ends of the branch pipes 21, the inlet pipe 22 is communicated with the branch pipes 21, the other ends of the branch pipes 21 are communicated with an outlet pipe 23, and the outlet pipe 23 is communicated with the branch pipes 21.

The spiral branch pipe 21 can enable the heat medium to be conveyed in an annular mode, centrifugal force generated by heat medium conveying enables the pipe wall of the floating coil pipe 2 to generate high-frequency vibration, accordingly, the laminar flow phenomenon of liquid in the tank body 1 is reduced, the turbulent flow phenomenon is generated, the liquid is enabled to be scratched, and therefore heat exchange efficiency of the liquid is improved. And the floating coil pipes 2 are provided with a plurality of floating coil pipes 2, the floating coil pipes 2 are uniformly distributed at intervals along the height direction and are coaxially distributed, the inlet pipe 22 of each floating coil pipe 2 is communicated with the first heat exchange pipe 24, and the outlet pipe 23 of each floating coil pipe 2 is communicated with the second heat exchange pipe 25, so that a heat medium is introduced into each floating coil pipe 2.

Be provided with liquid level detector 3 on the inner wall of the 1 bottom of jar body, liquid level detector 3 adopts piezoresistive sensor, can measure the depth of water, liquid level height promptly through measuring the hydraulic pressure that liquid level detector 3 received in the 1 internal liquid level detector of jar, and output trigger signal when the hydraulic pressure that piezoresistive sensor surveyed reaches the setting value, pulse signal promptly to this monitoring liquid level condition. In another embodiment, the liquid level detector 3 can also adopt a photoelectric liquid level switch, if the photoelectric liquid level switch is adopted, the photoelectric liquid level switch is required to be arranged on the inner wall of the tank body 1 at intervals along the height direction of the tank body, when the liquid level reaches the set height of the immersed photoelectric liquid level switch, the corresponding floating coil 21 is just immersed by the liquid, and the photoelectric liquid level switch triggers and outputs a pulse signal so as to monitor the liquid level condition.

And the liquid level detector 3 is connected with a control device which adopts a single chip microcomputer or a PLC controller, a section of the first heat exchange tube 24, which is positioned outside the tank body 1, is provided with a main valve 32, and the main valve 32 is used for switching on and off a heat medium and is electrically connected with the control device. When the liquid level detector 3 outputs a first trigger signal, namely when the liquid submerges the lowest floating coil 2 in the tank body 1, the control device controls the main valve 32 to be opened, so that a heat medium is introduced into the first heat exchange tube 24 in the tank body 1 to start heat exchange operation, and the heat dissipated from the first heat exchange tube 24 preheats the tank body 1 in advance, thereby improving the heat exchange efficiency.

The inlet side of the inlet pipe 22 of each floating coil 2 is provided with a control valve 31, and the control valve 31 adopts an electromagnetic valve for controlling the on-off of the hot medium and is in a closed state in a normal state. The control device is electrically connected to the plurality of control valves 31 to control the opening and closing of each of the electromagnetic valves, respectively. When the liquid level in the tank body 1 reaches a set liquid level for immersing one floating coil 2, the liquid level detector 3 outputs a trigger signal once, and the control device is connected with the liquid level detector 3 and used for receiving and responding the trigger signal to control the opening of the control valve 31 corresponding to the floating coil 2 immersed by the liquid, so that the heat medium in the first heat exchange tube 24 is introduced into the floating coil 2 and the liquid in the tank body 1 is heated. And when the main valve 32 is opened, the control valve 31 of the floating coil 2 at the lowest position in the tank body 1 is opened, and the liquid is heated.

The following examples can be referred to for setting the opening and closing of the control valve 31: the set liquid level is divided into a plurality of steps of 20cm, 40cm, 60cm and the like, each step corresponds to the liquid level height required by immersing one floating coil 2, for example, when the liquid level reaches 40cm, the liquid level indicates that the liquid just immerses two floating coils 2, at the moment, the liquid level detector 3 outputs a second trigger signal, at the moment, the control device opens the control valve 31 of the second floating coil 2, and keeps the control valve 31 of the lowest floating coil 21 open, so that the heat exchange area with the liquid is increased, and the heat exchange efficiency is improved.

And a section of the first heat exchange pipe 24, which is positioned outside the tank body 1, is provided with a delivery pump 33, the delivery pump 33 is positioned on one side of the main valve 32, which is close to the tank body 1, and the delivery pump 33 is connected with a control device. The control device increases the power of the delivery pump 33 when receiving the trigger signal, and the power of the delivery pump 33 is in a proportional relation with the number of the opening control valves 31, namely, the higher the accumulated number of the trigger signals is, the higher the power of the delivery pump 33 is. The mode that power increases progressively can reduce the internal pressure that the coil pipe 2 received that floats when the coil pipe 2 that floats of a small amount of initial stage starts, avoids floating coil pipe 2 to burst or reveal and cause the potential safety hazard, and when liquid total volume continuously rose, the coil pipe 2 that floats opened quantity and increases progressively, and the power of increase delivery pump 33 promotes heat medium flux this moment to accelerate the heat exchange.

In order to maintain the flow of the liquid in the tank 1 to accelerate the heat exchange, a circulation impeller 4 and a driving member 41 connected to the circulation impeller 4 are provided in the tank 1, the circulation impeller 4 includes a rotating shaft 51 having a cylindrical shape, and the driving member 41 includes a servo motor fixed to the mounting cover 12 by screws. The servo motor is positioned outside the tank body 1, and the output shaft of the servo motor is coaxially fixed with the rotating shaft 51 of the circulation impeller 4, so as to drive the circulation impeller 4 to rotate.

The rotation axis of the circulation impeller 4 is coincident with the central axis of the floating coil 2, and the diameter of the circulation impeller 4 is consistent with the inner diameter of the floating coil 2 or the difference range is in a set range. The circulation impellers 4 are in one-to-one correspondence with the floating coil pipes 2, and each circulation impeller 4 is respectively positioned between the adjacent floating coil pipes 2. The circulating impeller 4 is used for pumping the liquid below the circulating impeller to the upper side of the circulating impeller, namely the pumping direction of the circulating impeller is vertical upward, and the pumping directions of the circulating impellers 4 are consistent. Since the liquid inlet pipe 13 is located at the bottom of the tank 1, the cryogenic liquid will be present below the circulating impeller 4 and will flow upwards along the central passage of the floating coil 2 under the action of the circulating impeller 4. According to the law of fluid thermal motion, the heated fluid floats upwards due to the fact that the density of the fluid is reduced and flows out of the top of the floating coil 2, the liquid at the top returns back and flows downwards under the action of the top of the tank body 1 under the pushing of the subsequent liquid to form circulation, and liquid circulation is formed, so that the heat exchange efficiency is improved.

And the eccentric end of the blade of the circulation impeller 4 is provided with a plurality of spoilers 42, the spoilers 42 are distributed at equal angular intervals along the circumferential direction of the rotating shaft 51, and the spoilers 42 are rectangular and long-shaped, are vertically distributed and extend into the gaps formed by the branch pipes 21 of the adjacent floating coil pipes 2. Since the gap is the region with the highest heat exchange efficiency, and the spoiler 42 is provided to accelerate the flow velocity of the liquid between the adjacent floating coils 2, the turbulent phenomenon is enhanced, thereby improving the heat exchange efficiency.

And the control device is electrically connected with the driving part 41, when the liquid level in the tank body 1 reaches the level of immersing the uppermost floating coil 2, namely the liquid level detector 3 outputs the last trigger signal, the control device controls the driving part 41, namely the servo motor to start, so as to drive the circulating impeller 4 to rotate, thereby improving the heat exchange efficiency. And the control device can carry out manual control in a wireless or wired mode through a mechanical switch or a virtual switch according to the intention of a user, so that the heat exchange system works in a low-power-consumption mode or a high-efficiency heat exchange mode, and the applicability is improved.

Referring to fig. 2 and 3, a connecting assembly 5 is arranged between adjacent circulating impellers 4, and the circulating impellers 4 are detachably connected through the connecting assembly 5, so that the circulating impellers 4 can be replaced, the floating coil 2 can be conveniently descaled, and the maintenance work of the floating coil 2 and the circulating impellers 4 can be conveniently carried out.

Referring to fig. 3 and 4, the top end and the bottom end of the rotating shaft 51 are provided with right-angle grooves and two right-angle grooves in opposite opening directions, the connecting assembly 5 comprises a sliding block 56 arranged at the bottom end of the rotating shaft 51, the sliding block 56 is fixed to the inner wall of the right-angle groove in a welded mode, and the sliding block 56 is circular and has a T-shaped radial section. The inner wall of the right-angle groove at the top end of the rotating shaft 51 is provided with a strip-shaped groove 52, the section of the strip-shaped groove 52 along the width direction is in a T shape, and the sliding block 56 of the circulating impeller 4 is used for being connected with the strip-shaped groove 52 of another circulating impeller 4 adjacent to the lower side of the sliding block in a sliding manner, so that the next circulating impeller 4 is hung on the previous circulating impeller 4. And the maximum width of the inner space of the strip-shaped groove 52 is greater than the opening width thereof, so as to limit the sliding block 56 to be separated from the strip-shaped groove 52, the bottom end of the strip-shaped groove 52 is provided with an installation groove 53 for the sliding block 56 to be inserted, and the width of the installation groove 53 is greater than the maximum width of the inner space of the strip-shaped groove 52.

And the bottom end of the rotating shaft 51 is provided with a screw hole 54, the top end of the rotating shaft 51 is provided with a through hole 55, and a bolt 57 in threaded connection with the screw hole 54 passes through the through hole 55. When the sliding block 56 slides to be separated from the mounting groove 53 and enters the strip-shaped groove 52, the through hole 55 is opposite to the screw hole 54, and at the moment, the next circulating impeller 4 and the previous circulating impeller 4 can be locked by screwing the bolt 57, so that the shaking of the circulating impeller 4 is reduced, the floating coil 2 (shown in figure 2) is prevented from being damaged due to collision with the floating coil 2 (shown in figure 2) when the circulating impeller 4 shakes, and the service life is prolonged.

Referring to fig. 2 and 5, the present embodiment further provides a control method, which is applied to the heat exchange system of the heat exchanger, and includes the following steps:

s100: collecting the height value of each floating coil 2 relative to the bottom wall of the tank body 1;

specifically, the liquid level is 0 when the liquid level is on the bottom wall of the can body 1, and therefore the height relative to the bottom wall of the can body 1 is the liquid level height.

S200: and calculating a plurality of set liquid level values according to the height values of the floating coil pipes 2.

Specifically, the liquid level height required when each floating coil 2 is immersed in liquid is obtained according to the height value of each floating coil 2, and a plurality of groups of liquid level height values are set as set liquid level values.

S300: collecting the current liquid level value of the tank body 1;

s400: and outputting an operation instruction according to the current level value and the set level value.

S500: and when the current liquid level value exceeds the set liquid level value corresponding to the current floating coil 2, outputting an operation instruction for correspondingly opening the control valve 31 of the current floating coil 2.

Specifically, the current liquid level value of the tank body 1 can be collected through the piezoresistive liquid level sensor, whether an operation instruction is output or not is judged according to the current liquid level value and the set liquid level value, when liquid submerges one floating coil 2, the liquid level reaches one set liquid level value, the operation instruction is output once at the moment, the corresponding control valve 31 is controlled to be opened, the submerged floating coil 2 is led in a heat medium, and the liquid is heated.

The implementation principle of the heat exchange system of the heat exchanger in the embodiment of the application is as follows: firstly, the staff lets in cryogenic liquids through feed liquor pipe 13 in to jar body 1 for liquid level continuously rises, and when liquid submergence floating coil 2 of the below, liquid level detector 3 detects the liquid level and reaches the settlement liquid level value and output trigger signal, and controlling means responds to the control valve 31 of this floating coil 2 and opens, controls main valve 32 simultaneously and opens, makes in heat medium gets into the floating coil 2 of below through first heat exchange tube 24 to heat liquid.

When the liquid submerges one floating coil 2, the liquid level reaches a set liquid level value, the liquid level detector 3 outputs a trigger signal at the moment, and the control device controls the control valve 31 of the submerged floating coil 2 to be opened, so that the floating coils 2 are gradually introduced with the heat medium, and the heat exchange area is increased. Meanwhile, the control device controls the power of the delivery pump 33 to gradually rise, so that the flow of the heat medium is increased, and the floating coil pipes 2 with increased quantity are opened in a matching manner, so that the heat delivery quantity is gradually increased, the heat exchange speed is accelerated, and the heat exchange efficiency is improved.

When the circulation fan is installed, the slide block 56 at the bottom end of the rotating shaft 51 of the previous circulation fan is inserted into the installation groove 53 at the top end of the rotating shaft 51 of the next circulation fan, under the self-weight action of the circulation fan, the slide block 56 slides into the strip-shaped groove 52, so that the slide block 56 is limited to be separated from the strip-shaped groove 52, the through hole 55 is opposite to the screw hole 54, and the next circulation impeller 4 and the previous circulation impeller 4 can be locked only by inserting and screwing the bolt 57, so that the shaking of the circulation impeller 4 is reduced. When the circulating fan or the floating coil 2 needs to be cleaned, workers only need to sequentially disassemble the connecting components 5, and the cleaning can be facilitated.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (5)

1. The utility model provides a heat exchange system of heat exchanger, is including setting up a plurality of floating coil pipe (2), first heat exchange tube (24) and second heat exchange tube (25) in jar body (1), its characterized in that: the tank also comprises a liquid level detector (3), a control valve (31) and a control device, wherein a plurality of floating coil pipes (2) are distributed at intervals along the height direction of the tank body (1), the inlet of each floating coil pipe (2) is communicated with the first heat exchange pipe (24), and the outlet of each floating coil pipe is communicated with the second heat exchange pipe (25);

a plurality of control valves (31) are respectively arranged on the inlet or the outlet of each floating coil (2) and used for controlling the on-off of the heat medium; the liquid level detector (3) is used for detecting the liquid level of liquid in the tank body (1), when the liquid in the tank body (1) reaches a set liquid level when one floating coil (2) is immersed, the liquid level detector (3) outputs a trigger signal, and the control device is connected with the liquid level detector (3) and the control valve (31) and is used for receiving and responding to the trigger signal to control the control valve (31) corresponding to the floating coil (2) to be opened;

a section of the first heat exchange pipe (24) outside the tank body (1) is provided with a delivery pump (33), the delivery pump (33) is connected with a control device, the control device is used for controlling the power of the delivery pump (33) according to the accumulated times of the trigger signals, and the higher the accumulated times of the trigger signals is, the higher the power of the delivery pump (33) is;

the floating coil (2) is annular, the floating coils (2) are coaxially distributed, a circulating impeller (4) and a driving part (41) connected with the circulating impeller (4) are arranged in the tank body (1), and the rotating axis of the circulating impeller (4) is superposed with the central axis of the floating coil (2);

the circulation impellers (4) are arranged between the adjacent floating coil pipes (2) respectively, the circulation impellers (4) are used for pumping liquid below the circulation impellers to the upper side of the circulation impellers, and the pumping directions of the circulation impellers (4) are consistent;

a connecting assembly (5) is arranged between the adjacent circulating impellers (4), and the circulating impellers (4) are detachably connected through the connecting assembly (5);

circulation impeller (4) include pivot (51) of being connected with driving piece (41), coupling assembling (5) including set up in slider (56) of pivot (51) bottom, bar groove (52) have been seted up on pivot (51) top, slider (56) of circulation impeller (4) are used for sliding with bar groove (52) of another circulation impeller (4) that its below is adjacent and are connected, just the maximum width of bar groove (52) inner space is greater than its opening width, confession slider (56) male mounting groove (53) have been seted up to the bottom in bar groove (52).

2. The heat exchange system of a heat exchanger of claim 1, wherein: the first heat exchange tube (24) is provided with a main valve (32) on a section outside the tank body (1), the main valve (32) is connected with a control device, and the control device controls the main valve (32) to be opened when the liquid level detector (3) outputs a first trigger signal.

3. The heat exchange system of a heat exchanger of claim 1, wherein: the eccentric end of the blade of the circulation impeller (4) is provided with a spoiler (42), and the spoiler (42) extends to the position between the pipelines of the adjacent floating coil pipes (2).

4. The heat exchange system of a heat exchanger of claim 1, wherein: screw (54) have been seted up to pivot (51) bottom, through-hole (55) have been seted up on pivot (51) top, when slider (56) slide to break away from mounting groove (53) and get into in bar groove (52) through-hole (55) are relative with screw (54), just wear to be equipped with in through-hole (55) and screw (54) threaded connection's bolt (57).

5. A control method implemented by using the heat exchange system of the heat exchanger as claimed in any one of claims 1 to 4, comprising the steps of,

collecting the height value of each floating coil (2) relative to the bottom wall of the tank body (1);

calculating a plurality of set liquid level values according to the height value of each floating coil (2);

collecting the current liquid level value of the tank body (1);

outputting an operation instruction according to the current liquid level value and the set liquid level value;

and when the current liquid level value exceeds the set liquid level value corresponding to the current floating coil (2), outputting an operation instruction corresponding to opening a control valve (31) of the current floating coil (2).

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