CN112880438B

CN112880438B - Heat exchanger that pressure differential was adjusted is handled to communication cloud

Info

Publication number: CN112880438B
Application number: CN202110079723.5A
Authority: CN
Inventors: 王逸隆
Original assignee: Qingdao University of Science and Technology
Current assignee: Qingjian International Group Co Ltd
Priority date: 2020-05-09
Filing date: 2021-01-26
Publication date: 2022-10-25
Anticipated expiration: 2041-01-26
Also published as: CN112880439B; CN112880440A; CN112880440B; CN112880438A; CN112880439A

Abstract

The invention provides a heat exchanger for communication cloud processing pressure difference adjustment, wherein inlets of a first heat exchange tube, a second heat exchange tube and a third heat exchange tube are respectively provided with a first valve, a second valve and a third valve; the left side pipe, the central pipe and the right side pipe are internally provided with a first liquid level sensor, a second liquid level sensor and a third liquid level sensor respectively, the controller is connected with the cloud server, the cloud server is connected with the client, the controller transmits accumulated data of liquid level difference or liquid level difference change to the cloud server, the accumulated data are transmitted to the client through the cloud server, the client is a mobile phone, a user can select an automatic control or manual control working mode at the client, and the controller controls heat exchange according to the working mode selected by the user. According to the invention, through the mobile phone APP client, the automatic control of the valve through the accumulation of the pressure difference or the pressure difference change is realized through the controller, the energy is saved, the optimal efficiency is achieved, the intellectualization of the heat exchange system is improved, and the remote portable monitoring is realized.

Description

Heat exchanger that pressure differential was adjusted is handled to communication cloud

Technical Field

The invention relates to a shell-and-tube heat exchanger, in particular to a shell-and-tube heat exchanger for intermittent vibration descaling.

Background

The invention relates to descaling of a heat exchanger, and provides a novel invention for applying the descaling to a shell-and-tube heat exchanger on the basis of research and development of Qingdao science and technology university (application number 2019101874848).

The shell-and-tube heat exchanger is widely applied to industries such as chemical industry, petroleum industry, refrigeration industry, nuclear energy industry and power industry, and due to the worldwide energy crisis, the demand of the heat exchanger in industrial production is more and more, and the quality requirement of the heat exchanger is higher and more. In recent decades, although compact heat exchangers (plate type, plate fin type, pressure welded plate type, etc.), heat pipe type heat exchangers, direct contact type heat exchangers, etc. have been rapidly developed, because the shell and tube type heat exchangers have high reliability and wide adaptability, they still occupy the domination of yield and usage, and according to relevant statistics, the usage of the shell and tube type heat exchangers in the current industrial devices still accounts for about 70% of the usage of all heat exchangers.

After the shell-and-tube heat exchanger is scaled, the heat exchanger is cleaned by adopting conventional modes of steam cleaning, back flushing and the like, and the production practice proves that the effect is not good. The end socket of the heat exchanger can only be disassembled, and a physical cleaning mode is adopted, but the mode is adopted for cleaning, so that the operation is complex, the consumed time is long, the investment of manpower and material resources is large, and great difficulty is brought to continuous industrial production.

The mode of passively strengthening heat exchange is to strictly prevent the fluid vibration induction in the heat exchanger from being changed into effective utilization of vibration, so that the convective heat transfer coefficient of the transmission element at low flow speed is greatly improved, dirt on the surface of the heat transfer element is restrained by vibration, the thermal resistance of the dirt is reduced, and the composite strengthened heat transfer is realized.

In application, it is found that continuous heat exchange can cause the internal fluid to form stability, i.e. the fluid does not flow or has little fluidity, or the flow is stable, so that the vibration performance of the heat exchange tube is greatly weakened, and therefore, the descaling of the heat exchange tube and the heat exchange efficiency are influenced. There is therefore a need for improvements to the above-described heat exchangers.

The heat exchanger generally exchanges heat by two fluids, and the heat exchange of four fluids is rarely researched, the four-fluid heat exchange is researched, a novel induced vibration four-fluid shell-and-tube heat exchanger is developed,

current shell and tube heat exchangers include dual headers, one header evaporating and one header condensing, thereby forming a vibrating descaled heat pipe. Thereby improving the heat exchange efficiency of the heat pipe and reducing scaling. However, the heat pipe has insufficient uniformity of heat exchange, only one side is used for condensation, and the heat exchange amount is small, so that improvement is needed to develop a heat pipe system with a novel structure. There is therefore a need for improvements to the above-described heat exchangers.

In the prior application, a shell-and-tube heat exchanger for exchanging heat of four fluids has been developed, but the shell-and-tube heat exchanger is controlled according to the period, so that the vibration heat exchange effect is poor, and the intelligent degree is low. The present application therefore provides further improvements over the previous studies.

In the prior application, research is carried out on a heat exchange method of a heat exchanger, but the intelligent degree is not high, and remote control cannot be realized.

Disclosure of Invention

Aiming at the defects of the shell-and-tube heat exchanger in the prior art, the invention provides a portable remotely monitored four-fluid shell-and-tube heat exchanger with a novel structure. This heat exchanger can carry out long-range portable intelligent control according to the parameter, improves heat utilization effect and scale removal effect.

In order to realize the purpose, the invention adopts the following technical scheme:

a heat exchanger with cloud processing pressure difference adjustment comprises a shell, a heat exchange part, a shell side inlet connecting pipe and a shell side outlet connecting pipe; the heat exchange component is arranged in the shell and fixedly connected to the front tube plate and the rear tube plate; the shell pass inlet connecting pipe and the shell pass outlet connecting pipe are both arranged on the shell; the shell pass fluid enters from the shell pass inlet connecting pipe, exchanges heat through the heat exchange part and exits from the shell pass outlet connecting pipe;

the heat exchange component comprises a central tube, a left tube, a right tube and tube groups, wherein the tube groups comprise a left tube group and a right tube group, the left tube group is communicated with the left tube and the central tube, the right tube group is communicated with the right tube and the central tube, so that the central tube, the left tube, the right tube and the tube groups form heat exchange fluid closed circulation, phase change fluid is filled in the left tube and/or the central tube and/or the right tube, each tube group comprises a plurality of circular arc-shaped annular tubes, the end parts of the adjacent annular tubes are communicated, the annular tubes form a serial structure, and the end parts of the annular tubes form free ends of the annular tubes; the central tube comprises a first tube orifice and a second tube orifice, the first tube orifice is connected with the inlet of the left tube group, the second tube orifice is connected with the inlet of the right tube group, the outlet of the left tube group is connected with the left tube, and the outlet of the right tube group is connected with the right tube; the first pipe orifice and the second pipe orifice are arranged on the same side of the central pipe; the left tube group and the right tube group are in mirror symmetry along the plane where the axis of the central tube is located;

a left return pipe is arranged between the left side pipe and the central pipe, and a right return pipe is arranged between the right side pipe and the central pipe;

the heat exchanger also comprises a first heat exchange tube, a second heat exchange tube and a third heat exchange tube, wherein the first heat exchange tube penetrates through the left side tube, the second heat exchange tube penetrates through the central tube, and the third heat exchange tube penetrates through the right side tube; the first heat exchange tube, the second heat exchange tube and the third heat exchange tube respectively flow a first fluid, a second fluid and a third fluid;

the method is characterized in that the shell side fluid is a cold source, and the first fluid, the second fluid and the third fluid are heat sources; the inlets of the first heat exchange tube, the second heat exchange tube and the third heat exchange tube are respectively provided with a first valve, a second valve and a third valve which are in data connection with the controller;

the left side pipe, the center pipe, set up first pressure sensor in the right side pipe respectively, second pressure sensor and third pressure sensor, be used for detecting left side pipe, the intraductal pressure in center and the pipe right side, first pressure sensor, second pressure sensor and third pressure sensor carry out data connection with the controller, the controller draws the pressure data of left side pipe, right side pipe and center pipe according to time sequence, through the comparison of the pressure data of adjacent time quantum, obtain its pressure differential or the accumulative total of pressure differential change, the high in the clouds server is connected to the controller, the high in the clouds server is connected with the client, and wherein the controller passes to the high in the clouds server with the accumulative number data transmission of pressure differential or pressure differential change, then conveys the client to through the high in the clouds server, the client is the cell-phone, cell-phone installation APP program, the user can select automatic control or manual control's mode at the client, the controller controls the heat transfer according to the mode that the customer selected.

Preferably, in a manual control working mode, a user obtains accumulated data of the pressure difference or the pressure difference change according to a client, a control signal is manually input into the client, the control signal is transmitted to the central controller through the cloud server, and the central controller controls the first valve, the second valve and the third valve to be opened and closed according to the signal input by the client.

Preferably, in the automatic control operation mode, the controller controls the first valve, the second valve, and the third valve to open and close according to the detected pressure difference or the accumulation of the pressure difference change, thereby controlling whether the first fluid, the third fluid, and the second fluid exchange heat.

Preferably, when the first and third fluids exchange heat and the second fluid does not exchange heat, if the left pipe pressure or the right pipe pressure or the average pressure of the left and right pipes in the previous period is P1 and the left pipe pressure or the right pipe pressure or the average pressure of the left and right pipes in the adjacent subsequent period is P2, if the difference between P2 and P1 is lower than a threshold value, the controller controls the first and third valves to be closed, the second valve to be opened, so that the first and third fluids stop exchanging heat, and the second fluid exchanges heat; when the first fluid and the third fluid stop exchanging heat and the second fluid exchanges heat, if the pressure of the central tube in the previous time period is P1 and the pressure of the central tube in the adjacent subsequent time period is P2, if the difference value between P2 and P1 is lower than a threshold value, the controller controls the first valve and the third valve to be opened, the second valve is closed, so that the first fluid and the third fluid exchange heat, and the second fluid stops exchanging heat.

Preferably, the first and second nozzles are located on the upper side of the central tube. Preferably, the heat exchange of the four fluids can be carried out among the first fluid, the second fluid, the third fluid and the shell side fluid. The four fluid heat sources can be 1-3, and the rest of the fluid is a cold source, or the cold source can be 1-3, and the rest of the fluid is a heat source.

Preferably, the shell-side fluid is the cold source and the first, second and third fluids are the heat sources.

The invention has the following advantages:

1. according to the invention, through the mobile phone APP client, the automatic control of the valve through the accumulation of the pressure difference or the pressure difference change is realized through the controller, the energy is saved, the best efficiency is achieved, the intellectualization of the heat exchange system is improved, and the remote portable monitoring is realized.

2. According to the invention, through the liquid level difference or the accumulated liquid level difference of the front time period and the rear time period detected by the liquid level sensing element, the evaporation of the internal fluid can be judged to be basically saturated through the liquid level difference, and the volume of the internal fluid is basically not changed greatly. So that the fluid undergoes volume reduction to thereby realize vibration. When the liquid level difference is reduced to a certain degree, the internal fluid starts to enter a stable state again, and at the moment, the fluid needs to be heated so as to be evaporated and expanded again, so that the electric heater needs to be started for heating. The stable state of the fluid is judged according to the liquid level difference or the accumulation of the change of the liquid level difference, so that the result is more accurate, and the problem of error increase caused by aging due to the problem of operation time is solved.

3. According to the invention, through controlling the opening and closing of the first valve, the second valve and the third valve, on one hand, continuous heat exchange is realized for the shell process flow, and meanwhile, the elastic heat exchange tube can periodically and frequently vibrate, so that good descaling and heat exchange effects are realized.

4. The invention designs that the flowing directions of the first fluid, the third fluid and the second fluid are opposite, and further promotes the flowing of the phase-change fluid, thereby enhancing the heat transfer.

5. The invention designs a layout of a heat exchange component with a novel structure in a shell, optimizes the optimal relation between the parameters of the heat exchange tube and the flow, specific heat and the like of the fluid through a large number of experiments and numerical simulation, and creatively integrates the flow, the specific heat, the temperature and the target temperature of the heat exchange fluid into the size design of the heat exchanger relative to the previous design, thereby further improving the heat exchange efficiency.

6. Through the flowing direction of fluid in the shell, the reasonable change of the internal diameter and the interval of the tube bundle of the heat exchange tube improves the heat exchange efficiency.

Description of the drawings:

fig. 1 is a schematic structural view of a heat exchanger according to the present invention.

FIG. 2 is a schematic sectional view of a heat exchange member according to the present invention.

Fig. 3 is a top view of a heat exchange member.

Fig. 4 is a schematic diagram of a preferred structure of the heat exchanger.

Fig. 5 is another preferred schematic construction of the heat exchanger.

Fig. 6 is a schematic layout of heat exchange components arranged in a circular shell.

Fig. 7 is a schematic diagram of a preferred structure of the heat exchanger.

Fig. 8 is another preferred structure schematic of the heat exchanger.

In the figure: 1. tube group, left tube group 11,

right tube group

12, 21, left tube, 22, right tube, 3, free end, 4, free end, 5, free end, 6, free end, 7, annular tube, 8, central tube, 91-93, heat exchange tube, 10 first orifice, 13 second orifice, left return tube 14, right return tube 15, front tube plate 16, support 17, support 18, rear tube plate 19,

shell

20, 21, shell inlet connection, 22, shell outlet connection, 23, heat exchange component, 24 first valve, 25 second valve, 26 third valve, 27 inlet header, 28 outlet header

Detailed Description

The gas barrier film contains 11 layers of adhesive, the mass per unit area of the finished barrier film is more than or equal to 260g/m < 2 >, the thickness of the barrier film is more than or equal to 250 micrometers, and the thickness of PE is more than or equal to 80 micrometers.

The thickness of the PE of the heat-sealing layer of the innermost layer is not less than 80 microns, the heat-sealing performance of the barrier film is fully guaranteed, and the physical properties such as tensile resistance and the like of the barrier film are improved, while the thickness of the PE adopted by a common STP plate is 50 microns, and the 50 microns is the minimum standard of the heat-sealing requirement of the barrier film in a vacuum packaging product and cannot meet the service life requirement of decades of building products.

The thickness of the alkali-resistant glass fiber cloth adopted by the outermost layer is larger than or equal to 110 micrometers, the surface density is larger than or equal to 110g/m & lt 2 & gt, the glass fiber cloth of the specification can meet the strength requirement of the barrier film, the scratch resistance and the puncture resistance of the barrier film on the outer side of the STP plate can be guaranteed, the bonding strength with cement mortar can be guaranteed, the flexibility of the barrier film can be guaranteed, and the barrier film is not easy to break during production, processing and planting. The convenience and the safety of the STP plate in the construction process are ensured.

A shell-and-tube heat exchanger, as shown in fig. 1, comprises a shell 20, a heat exchange component 23, a shell-side inlet connecting pipe 21 and a shell-side outlet connecting pipe 22; the heat exchange component 23 is arranged in the shell 20 and fixedly connected to the front tube plate 16 and the rear tube plate 19; the shell side inlet connecting pipe 21 and the shell side outlet connecting pipe 22 are both arranged on the shell 20; fluid enters from the shell side inlet connecting pipe 21, exchanges heat through the heat exchange part and exits from the shell side outlet connecting pipe 22.

Preferably, the heat exchange member extends in a horizontal direction. The heat exchanger is arranged in the horizontal direction.

Fig. 2 shows a top view of a heat exchange part 23, which comprises a central tube 8, a left tube 21, a right tube 22 and tube groups 1, wherein the tube groups 1 comprise a left tube group 11 and a right tube group 12, the left tube group 11 is communicated with the left tube 21 and the central tube 8, the right tube group 12 is communicated with the right tube 22 and the central tube 8, so that the central tube 8, the left tube 21, the right tube 22 and the tube groups 1 form a closed circulation of heating fluid, the left tube 21 and/or the central tube 8 and/or the right tube 22 are filled with phase change fluid, each tube group 1 comprises a plurality of circular tubes 7 in the shape of circular arcs, the ends of the adjacent circular tubes 7 are communicated, so that the plurality of circular tubes 7 form a serial structure, and the ends of the circular tubes 7 form free ends 3-6 of the circular tubes; the central tube comprises a first tube orifice 10 and a second tube orifice 13, the first tube orifice 10 is connected with the inlet of the left tube group 11, the second tube orifice 13 is connected with the inlet of the right tube group 12, the outlet of the left tube group 11 is connected with the left tube 21, and the outlet of the right tube group 12 is connected with the right tube 22; the first orifice 10 and the second orifice 13 are arranged on the same side of the central tube 8. The left tube group and the right tube group are in mirror symmetry along the plane of the axis of the central tube.

The ends of the two ends of the center tube 8, the left tube 21 and the right tube 22 are disposed in the openings of the front and

rear tube plates

16, 19 for fixation. The first orifice 10 and the second orifice 13 are located on the upper side of the central tube 8.

The heat exchanger further comprises a first heat exchange tube 91, a second heat exchange tube 92 and a third heat exchange tube 93, wherein the first heat exchange tube 91 penetrates through the left side tube 21, the second heat exchange tube 92 penetrates through the central tube 8, and the third heat exchange tube 93 penetrates through the right side tube 22. The first heat exchange pipe 91, the second heat exchange pipe 92, and the third heat exchange pipe 93 flow a first fluid, a second fluid, and a third fluid, respectively. The first fluid, the second fluid, the third fluid and the shell side fluid can exchange heat among the four fluids. The four fluid heat sources can be 1-3, and the rest of the fluid is a cold source, or the cold source can be 1-3, and the rest of the fluid is a heat source.

As a preferred example of the heat exchange, for example, the heat exchange process is as follows:

the first fluid is a heat source, the second fluid, the third fluid and the shell pass fluid are cold sources, phase change fluid in the heat exchange component is subjected to phase change through heat exchange of the first fluid, so that the shell pass fluid is subjected to heat exchange through the annular pipe 7, meanwhile, vapor phase fluid enters the central pipe and the right side pipe to exchange heat with the second fluid and the third fluid, and condensed fluid after heat exchange returns to the right side pipe through the return pipe, so that heat exchange of the four fluids is realized.

Preferably, the third fluid and the second fluid are heat sources, the first fluid and the shell-side fluid are cold sources, and the phase-change fluid in the heat exchange part is subjected to phase change through heat exchange of the second fluid and the third fluid, so that the shell-side fluid is radiated outwards through the annular pipe 7, meanwhile, the vapor-phase fluid enters the left side pipe and exchanges heat with the first fluid, and the condensed fluid after heat exchange returns to the right pipe box through the return pipe, so that the four-fluid heat exchange is realized.

Preferably, the shell-side fluid is a heat source, the first fluid, the second fluid and the third fluid are cold sources, and the heat exchange of the shell-side fluid enables the fluid in the heat exchange component to absorb heat and to exchange heat with the first fluid, the second fluid and the third fluid, so that the heat exchange of the four fluids is realized.

Preferably, the first fluid and the third fluid are cold sources, the second fluid and the shell-side fluid are heat sources, and the heat exchange is realized through the second fluid and the shell-side fluid, so that the four-fluid heat exchange is realized.

Preferably, the second fluid is a cold source, the first fluid, the third fluid and the shell-side fluid are heat sources, and the second fluid is subjected to heat exchange through heat exchange of the first fluid, the third fluid and the shell-side fluid, so that four-fluid heat exchange is realized.

Preferably, the shell-side fluid is a cold source, the first fluid, the second fluid and the third fluid are heat sources, and the four-fluid heat exchange is realized by exchanging heat between the first fluid, the second fluid and the third fluid and the shell-side fluid.

Preferably, the first heat exchange tube, the second heat exchange tube and the third heat exchange tube have the same inner diameter.

Preferably, a left return pipe 14 is arranged between the left pipe 21 and the central pipe 8, and a right return pipe 14 is arranged between the right pipe 22 and the central pipe 8. Preferably, the return pipe is arranged at the end of the central pipe. Both ends of the central tube are preferred.

Preferably, the fluid is a phase change fluid, preferably a vapour-liquid phase change fluid.

The following description focuses on the case where the shell-side fluid is the heat sink and the first fluid, the second fluid, and the third fluid are the heat sources.

The fluid exchanges heat and evaporates in the central pipe 8, flows to the left and

right headers

21, 22 along the annular tube bundle, and the fluid can produce volume expansion after being heated, thereby forming steam, and the volume of steam is far greater than water, therefore the steam that forms can carry out the flow of quick impact formula in the coil pipe. Due to volume expansion and steam flowing, the free end of the annular tube can be induced to vibrate, the vibration is transmitted to surrounding heat exchange fluid by the free end of the heat exchange tube in the vibration process, and the fluid can generate disturbance with each other, so that the surrounding heat exchange fluid forms turbulent flow, a boundary layer is damaged, and the purpose of enhancing heat transfer is achieved. The fluid is condensed and released heat in the left and right side pipes and then flows back to the central pipe through the return pipe. On the contrary, the fluid can exchange heat in the left and right side pipes, then enters the central pipe, is condensed and returns to the left and right side pipes through the return pipe for circulation.

According to the invention, the prior art is improved, and the condensation (evaporation) collecting pipe and the pipe groups are respectively arranged into two pipes which are distributed on the left side and the right side, so that the pipe groups distributed on the left side and the right side can perform vibration heat exchange descaling, the heat exchange vibration area is enlarged, the vibration is more uniform, the heat exchange effect is more uniform, the heat exchange area is increased, and the heat exchange and descaling effects are enhanced.

The flow rate in the present application is a flow rate per unit time, not specifically described. The unit is m3/s.

Preferably, as shown in fig. 7 and 8, the first valve 24, the second valve 25 and the third valve 26 are arranged at the inlets of the first heat exchange pipe 91, the second heat exchange pipe 92 and the third heat exchange pipe 93, the first valve 24, the second valve 25 and the third valve 26 are in data connection with a controller, and the controller controls the opening and closing and the opening of the first valve 24, the second valve 25 and the third valve 26 for controlling the flow of the heat exchange fluid entering the first heat exchange pipe 91, the second heat exchange pipe 92 and the third heat exchange pipe 93.

It has been found in research and practice that continuous heat exchange of the heat source with stable power can result in stable fluid formation of the internal heat exchange components, i.e. the fluid is not flowing or has little fluidity, or the flow is stable, and the vibration performance of the annular tube 7 is greatly weakened, thereby affecting the descaling of the left tube group 11 and the right tube group 12 and the heat exchange efficiency. There is therefore a need for improvements to the heat exchangers described above as follows.

In the prior application of the inventor, a periodic heat exchange mode is provided, and the vibration of the annular tube is continuously promoted through the periodic heat exchange mode, so that the heat exchange efficiency and the descaling effect are improved. However, adjusting the vibration of the tube bundle with a fixed periodic variation can result in hysteresis and too long or too short a period. Therefore, the invention improves the previous application and intelligently controls the vibration, so that the fluid in the device can realize frequent vibration, and good descaling and heat exchange effects are realized.

Aiming at the defects in the technology researched in the prior art, the invention provides a novel heat exchanger capable of intelligently controlling vibration. The heat exchanger can improve the heat exchange efficiency, thereby realizing good descaling and heat exchange effects.

1. Pressure-based autonomous vibration adjustment

Preferably, a first pressure sensor, a second pressure sensor and a third pressure sensor are respectively arranged in the left side pipe 21, the center pipe 8 and the right side pipe 22 and used for detecting pressures in the left side pipe, the center pipe and the right side pipe, the first pressure sensor, the second pressure sensor and the third pressure sensor are in data connection with the controller, the controller extracts pressure data of the left side pipe, the right side pipe and the center pipe according to a time sequence, pressure difference or pressure difference change accumulation is obtained through comparison of the pressure data of adjacent time periods, the controller is connected with the cloud server, the cloud server is connected with a client, the controller transmits the accumulated data of the pressure difference or the pressure difference change to the cloud server and transmits the accumulated data to the client through the cloud server, the client is a mobile phone, the mobile phone is provided with an APP program, a user can select an automatic control or manual control working mode at the client, and the controller controls heat exchange according to the working mode selected by the client.

Preferably, in the manual control operation mode, the user obtains accumulated data of the pressure difference or the pressure difference change according to the client, inputs a control signal manually at the client, and transmits the control signal to the central controller through the cloud server, and the central controller controls the opening and closing of the first valve 24, the second valve 25 and the third valve 26 according to the signal input by the client.

Preferably, in the automatic control operation mode, the controller controls the first, second and third fluids to exchange heat by controlling the opening and closing of the first, second and

third valves

24, 25 and 26 according to the detected pressure difference or the accumulation of the change in the pressure difference.

According to the invention, through the mobile phone APP client, the automatic control of the valve through the accumulation of the pressure difference or the pressure difference change is realized through the controller, the energy is saved, the optimal efficiency is achieved, the intellectualization of the heat exchange system is improved, and the remote portable monitoring is realized.

Preferably, in the automatic control operation mode, when the pressure difference or the cumulative sum of changes in the pressure difference is lower than the threshold value, the controller controls the first valve 24, the second valve 25, and the third valve 26 to open and close, thereby controlling whether the first fluid, the third fluid, and the second fluid exchange heat.

Through the pressure sensing element detects the time quantum pressure differential or the pressure differential that accumulates before and after, can judge through the pressure differential that the evaporation of inside fluid has reached saturation basically, the volume of inside fluid also basically changes little, and under this kind of circumstances, inside fluid is relatively stable, and the tube bank vibratility at this moment worsens, therefore needs to adjust, makes it vibrate to stop heating. So that the fluid undergoes volume reduction to thereby realize vibration. When the pressure difference is reduced to a certain degree, the internal fluid starts to enter a stable state again, and at the moment, the fluid needs to be heated so as to be evaporated and expanded again, so that the electric heater needs to be started for heating.

The stable state of the fluid is judged according to the pressure difference or the accumulation of the pressure difference change, so that the result is more accurate, and the problem of error increase caused by aging due to the running time problem is solved.

In the automatic control mode, preferably, when the first and third fluids exchange heat and the second fluid does not exchange heat, if the left pipe pressure or the right pipe pressure or the average pressure of the left and right pipes in the previous period is P1, and the left pipe pressure or the right pipe pressure or the average pressure of the left and right pipes in the adjacent subsequent period is P2, if the difference between P2 and P1 is lower than a threshold, the controller controls the first and third valves to be closed, the second valve to be opened, and the first and third fluids stop exchanging heat and the second fluid exchanges heat; when the first fluid and the third fluid stop exchanging heat and the second fluid exchanges heat, if the pressure of the central tube in the previous time period is P1 and the pressure of the central tube in the adjacent subsequent time period is P2, if the difference value between P2 and P1 is lower than a threshold value, the controller controls the first valve and the third valve to be opened, the second valve is closed, so that the first fluid and the third fluid exchange heat, and the second fluid stops exchanging heat.

The operation state of the valve is determined according to different conditions through the difference of the heating pressure of different side pipes.

Preferably, when the first and third fluids exchange heat and the second fluid does not exchange heat, if the left pipe pressure or the right pipe pressure or the average pressure of the left and right pipes in the preceding period is P1, and the left pipe pressure or the right pipe pressure or the average pressure of the left and right pipes in the adjacent following period is P2, if P1= P2, the heating is judged according to the following conditions:

if P1 is larger than the pressure of the first data, the controller controls the first valve and the third valve to be closed, and the second valve is opened, so that the heat exchange of the first fluid and the third fluid is stopped, and the heat exchange of the second fluid is carried out; wherein the first data is greater than the pressure of the phase-change fluid after the phase change; preferably the first data is a pressure at which the phase change fluid is substantially phase-changed;

if the P1 is less than or equal to the pressure of the second data, the controller controls the first valve and the third valve to be continuously opened, and the second valve is continuously closed, so that the first fluid and the third fluid continuously exchange heat, and the second fluid continuously stops exchanging heat, wherein the second data is less than or equal to the pressure at which the phase change fluid does not change phase.

The first data is pressure data in a fully heated state, and the second data is pressure data in the absence of heating or in the beginning of heating. Through the judgment of the pressure, the operation state of the valve is determined according to different conditions, and overheating or just starting operation is avoided.

Preferably, when the first and third fluids do not exchange heat and the second fluid exchanges heat, if the pressure of the central tube in the previous time period is P1 and the pressure of the central tube in the adjacent subsequent time period is P2, if P1= P2, the heating is judged according to the following conditions:

if P1 is larger than the pressure of the first data, the controller controls the first valve and the third valve to be opened, and the second valve is closed; wherein the first data is greater than the pressure of the phase change fluid after the phase change; preferably the first data is the pressure at which the phase change fluid substantially changes phase;

if P1 is less than or equal to the pressure of the second data, the controller controls the first valve and the third valve to be continuously closed, and the second valve is continuously opened, wherein the second data is less than or equal to the pressure at which the phase change fluid does not change phase.

The first data is pressure data in a fully heated state, and the second data is pressure data in the absence of heating or in the beginning of heating. Through the judgment of the pressure, the operation state of the valve is determined according to different conditions through the judgment of the pressure, and overheating or operation starting is avoided.

Preferably, the left side pipe, the right side pipe and the central pipe are respectively provided with a plurality of n pressure sensing elements, and the pressure P in the current time period is calculated in sequence _i Pressure Q of the preceding period _i-1 Difference D of _i ＝P _i -Q _i-1 And for n pressure differences D _i Performing arithmetic cumulative summation

When the value of Y is lower than the set threshold value, the controller controls the first valve, the second valve and the third valve to open and close.

Preferably, when the first and third valves are opened and the second valve is closed, the first and third valves are closed and the second valve is opened under a threshold value.

Preferably, when the first and third electric heaters are closed and the second valve is opened, the controller controls the first and third valves to be opened and controls the second valve to be closed when the threshold value is lower than the threshold value.

The operation state of the valve is determined according to different conditions through the difference of the heating pressure of different pipe boxes.

Preferably, if Y =0, the heating is judged according to the following:

when the first and third valves are opened and the second valve is closed, or when the first and third valves are closed and the second valve is opened:

if P is _i If the arithmetic mean of (1) is greater than the pressure of the first data, the controller controls the opened valve to close and the closed valve to open when the pressure is lower than the threshold value; wherein the first data is greater than the pressure of the phase change fluid after the phase change; preferably the pressure at which the phase change fluid substantially changes phase;

if P _i Is less than the pressure of the second data, the controller controls the opened valve to continue to open and the closed valve to continue to close when the pressure of the second data is less than or equal to the pressure at which the phase change fluid does not undergo the phase change.

The first data is pressure data in a fully heated state, and the second data is pressure data in the absence of heating or in the beginning of heating. Through the judgment of the pressure, the operation state of the valve is determined according to different conditions, so that alternate heating is realized.

Preferably, the period of time for measuring the pressure is 1 to 10 minutes, preferably 3 to 6 minutes, and further preferably 4 minutes.

Preferably, the threshold is 100-1000pa, preferably 500pa.

Preferably, the pressure value may be an average pressure value over a period of the time period. The pressure at a certain moment in time may also be used. For example, preferably both are pressures at the end of the time period.

2. Self-regulating vibration based on temperature

Preferably, a first temperature sensor, a second temperature sensor and a third temperature sensor are respectively arranged in the left side pipe 21, the center pipe 8 and the right side pipe 22 and used for detecting the temperature in the left side pipe, the center and the right side pipe, the first temperature sensor, the second temperature sensor and the third temperature sensor are in data connection with the controller, the controller extracts the temperature data of the left side pipe, the right side pipe and the center pipe according to a time sequence, the temperature difference or the accumulation of the temperature difference change is obtained through the comparison of the temperature data of adjacent time periods, the controller is connected with the cloud server, the cloud server is connected with the client, the controller transmits the accumulated data of the temperature difference or the temperature difference change to the cloud server and then transmits the accumulated data to the client through the cloud server, the client is a mobile phone, a mobile phone installation program is installed on the mobile phone, a user can select an automatic control or manual control working mode at the client, and the controller controls the heat exchange according to the working mode selected by the client.

Preferably, in the manual control mode, the user obtains the accumulated data of the temperature difference or the temperature difference change according to the client, inputs a control signal manually at the client, and transmits the control signal to the central controller through the cloud server, and the central controller controls the first valve 24, the second valve 25 and the third valve 26 to open and close according to the signal input by the client.

third valves

24, 25 and 26 according to the detected temperature difference or the accumulation of the change in the temperature difference.

According to the invention, through the mobile phone APP client, the automatic control of the valve through the temperature difference or the accumulation of the temperature difference change is realized through the controller, the energy is saved, the optimal efficiency is achieved, the intellectualization of the heat exchange system is improved, and the remote portable monitoring is realized.

Preferably, in the automatic control operation mode, when the temperature difference or the cumulative total of changes in the temperature difference is lower than the threshold value, the controller controls the first valve 24, the second valve 25, and the third valve 26 to open and close, thereby controlling whether the first fluid, the third fluid, and the second fluid exchange heat.

The temperature difference between the previous time and the later time or the accumulated temperature difference detected by the temperature sensing element can be used for judging that the evaporation of the internal fluid is basically saturated and the volume of the internal fluid is not changed greatly. So that the fluid undergoes a volume reduction to thereby realize vibration. When the temperature difference is reduced to a certain degree, the internal fluid starts to enter a stable state again, and the fluid needs to be heated to evaporate and expand again, so that the electric heater needs to be started for heating.

The stable state of the fluid is judged according to the temperature difference or the accumulation of the temperature difference change, so that the result is more accurate, and the problem of error increase caused by aging due to the problem of operation time is solved.

In the automatic control mode, preferably, when the first and third fluids exchange heat and the second fluid does not exchange heat, if the left tube temperature or the right tube temperature or the average temperature of the left and right tubes in the previous period is T1, and the left tube temperature or the right tube temperature or the average temperature of the left and right tubes in the next period is T2, if the difference between T2 and T1 is lower than a threshold, the controller controls the first valve and the third valve to be closed, the second valve to be opened, so that the first fluid and the third fluid stop exchanging heat, and the second fluid exchanges heat; when the first fluid and the third fluid stop exchanging heat, and the second fluid exchanges heat, if the temperature of the central tube in the previous time period is T1, and the temperature of the central tube in the next time period is T2, if the difference value between T2 and T1 is lower than the threshold value, the controller controls the first valve and the third valve to be opened, and the second valve is closed, so that the first fluid and the third fluid exchange heat, and the second fluid stops exchanging heat.

The operating state of the valve is determined according to different conditions through the difference of the heating temperatures of different side pipes.

Preferably, when the first and third fluids exchange heat and the second fluid does not exchange heat, if the left tube temperature or the right tube temperature or the average temperature of the left and right tubes in the previous period is T1, and the left tube temperature or the right tube temperature or the average temperature of the left and right tubes in the next subsequent period is T2, if T1= T2, the heating is determined according to the following conditions:

if T1 is greater than the temperature of the first data, the controller controls the first valve and the third valve to be closed, and the second valve is opened, so that the heat exchange of the first fluid and the third fluid is stopped, and the heat exchange of the second fluid is carried out; wherein the first data is greater than the temperature of the phase change fluid after the phase change; preferably the first data is a temperature at which the phase change fluid substantially changes phase;

if T1 is less than or equal to the temperature of the second data, the controller controls the first valve and the third valve to be opened continuously, the second valve is closed continuously, so that the first fluid and the third fluid continue to exchange heat, the second fluid continues to stop exchanging heat, and the second data is less than or equal to the temperature at which the phase change fluid does not change phase.

The first data is temperature data of a sufficiently heated state, and the second data is temperature data of no heating or temperature data of the beginning of heating. Through the judgment of the temperature, the operation state of the valve is determined according to different conditions, and overheating or just starting operation is avoided.

Preferably, when the first and third fluids do not exchange heat and the second fluid exchanges heat, if the temperature of the central tube in the preceding period is T1 and the temperature of the central tube in the adjacent succeeding period is T2, if T1= T2, the heating is determined according to the following conditions:

if T1 is larger than the temperature of the first data, the controller controls the first valve and the third valve to be opened, and the second valve is closed; wherein the first data is greater than the temperature of the phase change fluid after the phase change; preferably the first data is a temperature at which the phase change fluid substantially changes phase;

and if the T1 is less than or equal to the temperature of the second data, the controller controls the first valve and the third valve to be continuously closed, and the second valve is continuously opened, wherein the second data is less than or equal to the temperature at which the phase change fluid does not have the phase change.

The first data is temperature data of a sufficiently heated state, and the second data is temperature data of no heating or temperature data of the beginning of heating. Through the judgment of the temperature, the operation state of the valve is determined according to different conditions through the judgment of the temperature, and overheating or just starting operation is avoided.

Preferably, the left side pipe, the right side pipe and the central pipe are respectively provided with a plurality of n temperature sensing elements, and the temperature T of the current time period is calculated in sequence _i Temperature Q of the preceding time period _i-1 Difference D of _i ＝T _i -Q _i-1 And for n temperature differences D _i Performing arithmetic cumulative summation

Preferably, when the first and third electric heaters are closed and the second valve is opened, and the threshold value is lower than the threshold value, the controller controls the first and third valves to be opened and the controller controls the second valve to be closed.

The operation state of the valve is determined according to different conditions through the difference of the heating temperatures of different pipe boxes.

Preferably, if Y =0, the heating is judged according to the following:

if P _i If the arithmetic mean of (1) is greater than the temperature of the first data, the controller controls the opened valve to close and the closed valve to open when the temperature is lower than the threshold value; wherein the first data is greater than the temperature of the phase change fluid after the phase change; preferably the temperature at which the phase change fluid substantially changes phase;

if P is _i Is less than the temperature of the second data, the controller controls the opened valve to continue to open and the closed valve to continue to close when the temperature of the second data is less than or equal to the temperature at which the phase change of the phase-change fluid does not occur.

The first data is temperature data in a fully heated state, and the second data is temperature data in which heating is not performed or heating is started. Through the judgment of the temperature, the operation state of the valve is determined according to different conditions, so that alternate heating is realized.

Preferably, the period of time for measuring the temperature is 1 to 10 minutes, preferably 3 to 6 minutes, and further preferably 4 minutes.

Preferably, the temperature value may be an average temperature value over a period of the time period. The temperature at a certain moment in time may also be used. For example, preferably both are temperatures at the end of the time period.

3. Vibration based on liquid level autonomous regulation

Preferably, a first liquid level sensor, a second liquid level sensor and a third liquid level sensor are respectively arranged in the left side pipe 21, the central pipe 8 and the right side pipe 22 and used for detecting liquid levels in the left side pipe, the center and the pipe right side pipe, the first liquid level sensor, the second liquid level sensor and the third liquid level sensor are in data connection with the controller, the controller extracts liquid level data of the left side pipe, the right side pipe and the central pipe according to time sequence, accumulation of liquid level difference or liquid level difference change is obtained through comparison of the liquid level data of adjacent time periods, the controller is connected with the cloud server, the cloud server is connected with the client, the controller transmits the accumulated data of the liquid level difference or the liquid level difference change to the cloud server and then transmits the accumulated data to the client through the cloud server, the client is a mobile phone, a mobile phone installation program is adopted, a user can select an automatic control or manual control working mode at the client, and the controller controls heat exchange according to the working mode selected by the client.

Preferably, in the manual control operation mode, the user obtains accumulated data of the liquid level difference or the change of the liquid level difference according to the client, inputs a control signal manually at the client, and transmits the control signal to the central controller through the cloud server, and the central controller controls the opening and closing of the first valve 24, the second valve 25 and the third valve 26 according to the signal input by the client.

Preferably, in the automatic control operation mode, the controller controls the opening and closing of the first valve 24, the second valve 25, and the third valve 26 based on the detected level difference or the accumulation of changes in the level difference, thereby controlling whether or not the first fluid, the third fluid, and the second fluid exchange heat.

According to the invention, through the mobile phone APP client, the automatic control of the valve through the accumulation of the liquid level difference or the change of the liquid level difference is realized through the controller, the energy is saved, the optimal efficiency is achieved, the intellectualization of the heat exchange system is improved, and the remote portable monitoring is realized.

Preferably, in the automatic control operation mode, when the liquid level difference or the cumulative total of changes in the liquid level difference is lower than the threshold value, the controller controls the opening and closing of the first valve 24, the second valve 25, and the third valve 26 to control whether or not the first fluid, the third fluid, and the second fluid exchange heat.

Through the liquid level difference or the accumulated liquid level difference of the front time period and the rear time period detected by the liquid level sensing element, the evaporation of the fluid inside can be judged to be basically saturated through the liquid level difference, and the volume of the fluid inside is basically not changed greatly. So that the fluid undergoes volume reduction to thereby realize vibration. When the liquid level difference is reduced to a certain degree, the internal fluid starts to enter a stable state again, and at the moment, the fluid needs to be heated so as to be evaporated and expanded again, so that the electric heater needs to be started for heating.

The stable state of the fluid is judged according to the liquid level difference or the accumulation of the change of the liquid level difference, so that the result is more accurate, and the problem of error increase caused by aging due to the problem of operation time is solved.

In the automatic control operation mode, preferably, when the first and third fluids exchange heat and the second fluid does not exchange heat, if the average liquid level of the left tube or the right tube or the left and right tubes in the previous period is L1, and the average liquid level of the left tube or the right tube or the left and right tubes in the next period is L2, if the difference between L1 and L2 is lower than the threshold, the controller controls the first valve and the third valve to be closed, the second valve is opened, so that the first fluid and the third fluid stop exchanging heat, and the second fluid does not exchange heat; when the first fluid and the third fluid stop exchanging heat, and the second fluid exchanges heat, if the liquid level of the central tube in the previous time period is L1, and the liquid level of the central tube in the next time period is L2, if the difference value between L1 and L2 is lower than the threshold value, the controller controls the first valve and the third valve to be opened, and the second valve is closed, so that the first fluid and the third fluid exchange heat, and the second fluid stops exchanging heat.

The operation state of the valve is determined according to different conditions through the difference value of the liquid levels heated by different side pipes.

Preferably, when the first and third fluids exchange heat and the second fluid does not exchange heat, if the left tube level or the right tube level or the average liquid level of the left and right tubes in the previous period is L1, and the left tube level or the right tube level or the average liquid level of the left and right tubes in the next subsequent period is L2, if L1= L2, the heating is determined according to the following conditions:

if L1 is less than or equal to the liquid level of the first data, the controller controls the first valve and the third valve to be closed, and the second valve is opened, so that the heat exchange of the first fluid and the third fluid is stopped, and the heat exchange of the second fluid is carried out; wherein the first data is greater than the liquid level of the phase-change fluid after the phase change; preferably the first data is a level at which the phase change fluid is substantially phase changed;

if the L1 is larger than or equal to the liquid level of the second data, the controller controls the first valve and the third valve to be continuously opened, the second valve is continuously closed, so that the first fluid and the third fluid continuously exchange heat, the second fluid continuously stops exchanging heat, and the second data is smaller than or equal to the liquid level at which the phase change fluid does not change phase.

The first data is liquid level data in a fully heated state, and the second data is liquid level data in the state of no heating or the beginning of heating. Through the judgment of the liquid level, the running state of the valve is determined according to different conditions, and overheating or just starting running is avoided.

Preferably, when the first and third fluids do not exchange heat and the second fluid exchanges heat, if the liquid level of the central tube in the previous period is L1 and the liquid level of the central tube in the adjacent subsequent period is L2, if L1= L2, the heating is determined according to the following conditions:

if L1 is less than or equal to the liquid level of the first data, the controller controls the first valve and the third valve to be opened, and the second valve is closed; wherein the first data is greater than the liquid level of the phase-change fluid after the phase change; preferably the first data is a level at which the phase change fluid is substantially phase changed;

and if the L1 is larger than or equal to the liquid level of the second data, the controller controls the first valve and the third valve to be continuously closed, and the second valve is continuously opened, wherein the second data is smaller than or equal to the liquid level at which the phase change fluid does not change phase.

The first data is liquid level data in a fully heated state, and the second data is liquid level data in the state of no heating or the beginning of heating. Through the judgment of the liquid level, the operation state of the valve is determined according to different conditions through the judgment of the liquid level, and overheating or operation starting is avoided.

Preferably, the left side pipe, the right side pipe and the central pipe are respectively provided with a plurality of n liquid level sensing elements, and the liquid level L in the current time period is calculated in sequence _i With the liquid level Q of the preceding period _i-1 Difference D of _i ＝L _i -Q _i-1 And for n liquid level differences D _i Performing arithmetic cumulative summation

The operation state of the valve is determined according to different conditions by the difference of the heated liquid levels of different tube boxes.

Preferably, if Y =0, the heating is judged according to the following:

if P is _i If the arithmetic mean of the first data is less than or equal to the liquid level of the first data, the controller controls the opened valve to be closed and the closed valve to be opened when the arithmetic mean of the first data is less than or equal to the liquid level of the first data; wherein the first data is greater than the liquid level of the phase-change fluid after the phase change; preferably a level at which the phase change fluid is substantially phase-changed;

if P is _i Is greater than or equal toAnd when the liquid level of the second data is lower than the threshold value, the controller controls the opened valve to be continuously opened, the closed valve is continuously kept closed, and the second data is less than or equal to the liquid level at which the phase change fluid does not undergo phase change.

The first data is liquid level data in a fully heated state, and the second data is liquid level data in the state of no heating or the beginning of heating. Through the judgment of the liquid level, the operation state of the valve is determined according to different conditions, so that alternate heating is realized.

Preferably, the period of time for measuring the liquid level is 1 to 10 minutes, preferably 3 to 6 minutes, and further preferably 4 minutes.

Preferably, the level value may be an average level value over a period of time. The liquid level at a certain moment in time may also be used. For example, preferably both are the liquid level at the end of the time period.

4. Autonomous vibration adjustment based on speed

Preferably, a speed sensing element is arranged inside the left pipe group and/or the right pipe group and used for detecting the flow speed of fluid in the free end of the pipe bundle, the flow speed sensor is in data connection with the controller, the controller extracts flow speed data according to a time sequence and obtains the flow speed difference or the accumulation of the flow speed difference change through the comparison of the flow speed data of adjacent time periods, the controller is connected with the cloud server, the cloud server is connected with the client, the controller transmits the accumulation data of the flow speed difference or the flow speed difference change to the cloud server and then transmits the accumulation data to the client through the cloud server, the client is a mobile phone, an APP program is installed on the mobile phone, a user can select an automatic control or manual control working mode at the client, and the controller controls heat exchange according to the working mode selected by the user.

Preferably, in the manual control mode, the user obtains the accumulated data of the flow rate difference or the flow rate difference change according to the client, inputs a control signal manually at the client, and transmits the control signal to the central controller through the cloud server, and the central controller controls the opening and closing of the first valve 24, the second valve 25 and the third valve 26 according to the signal input by the client.

Preferably, in the automatic control operation mode, the controller controls the opening and closing of the first valve 24, the second valve 25, and the third valve 26 according to the detected flow rate difference or the accumulation of the change in the flow rate difference, thereby controlling whether the first fluid, the third fluid, and the second fluid exchange heat.

According to the invention, through the mobile phone APP client, the automatic control of the valve through the flow speed difference or the accumulation of the flow speed difference change is realized through the controller, the energy is saved, the best efficiency is achieved, the intellectualization of the heat exchange system is improved, and the remote portable monitoring is realized.

Preferably, in the automatic control operation mode, when the flow rate difference or the cumulative total of changes in the flow rate difference is lower than the threshold value, the controller controls the opening and closing of the first valve 24, the second valve 25, and the third valve 26 to control whether or not the first fluid, the third fluid, and the second fluid exchange heat.

The flow velocity difference or the cumulative flow velocity difference of the previous and subsequent time periods detected by the flow velocity sensing element can be used for judging that the evaporation of the fluid inside is basically saturated and the volume of the fluid inside is not changed greatly. So that the fluid undergoes volume reduction to thereby realize vibration. When the flow rate difference is reduced to a certain extent, the internal fluid starts to enter a stable state again, and heating is needed at the moment, so that the fluid is evaporated and expanded again, and therefore, the electric heater needs to be started for heating.

The steady state of the fluid is judged according to the flow rate difference or the accumulation of the flow rate difference change, so that the result is more accurate, and the problem of error increase caused by aging due to the operation time problem is solved.

In the automatic control operation mode, preferably, when the first and third fluids exchange heat and the second fluid does not exchange heat, if the flow rate in the previous time period is V1 and the flow rate in the next time period is V2, if the difference between V2 and V1 is lower than the threshold, the controller controls the first and third valves to be closed and the second valve to be opened, so that the first and third fluids stop exchanging heat and the second fluid exchanges heat; when the first fluid and the third fluid stop heat exchange, and the second fluid performs heat exchange, if the flow rate in the previous time period is V1, and the flow rate in the adjacent subsequent time period is V2, if the difference value between V2 and V1 is lower than a threshold value, the controller controls the first valve and the third valve to be opened, and the second valve is closed, so that the first fluid and the third fluid perform heat exchange, and the second fluid stops heat exchange.

The running state of the valve is determined according to different conditions by the difference of the flow rates heated by different side pipes.

Preferably, when the first and third fluids exchange heat and the second fluid does not exchange heat, if the flow rate in the previous period is V1 and the flow rate in the next following period is V2, if V1= V2, the heating is determined according to the following conditions:

if V1 is larger than or equal to the flow rate of the first data, the controller controls the first valve and the third valve to be closed, and the second valve is opened, so that the heat exchange of the first fluid and the third fluid is stopped, and the heat exchange of the second fluid is carried out; wherein the first data is greater than the flow rate of the phase-change fluid after the phase change; preferably the first data is the flow rate at which the phase change fluid substantially changes phase;

if V1 is less than or equal to the flow rate of the second data, the controller controls the first valve and the third valve to be continuously opened, and the second valve is continuously closed, so that the first fluid and the third fluid continuously exchange heat, and the second fluid continuously stops exchanging heat, wherein the second data is less than or equal to the flow rate at which the phase change fluid does not change phase.

The first data is flow rate data in a fully heated state, and the second data is flow rate data in the absence of heating or in the beginning of heating. Through the judgment of the flow velocity, the operation state of the valve is determined according to different conditions, and overheating or operation starting is avoided.

Preferably, when the first and third fluids do not exchange heat and the second fluid exchanges heat, if the flow rate in the preceding time period is V1 and the flow rate in the adjacent following time period is V2, if V1= V2, the heating is judged according to the following conditions:

if V1 is larger than or equal to the flow rate of the first data, the controller controls the first valve and the third valve to be opened, and the second valve is closed; wherein the first data is greater than the flow rate of the phase-change fluid after the phase change; preferably the first data is a flow rate at which the phase change fluid is substantially phase-changed;

if V1 is less than or equal to the flow rate of the second data, the controller controls the first valve and the third valve to be continuously closed, and the second valve is continuously opened, wherein the second data is less than or equal to the flow rate at which the phase change fluid does not undergo the phase change.

The first data is flow rate data in a fully heated state, and the second data is flow rate data in the absence of heating or in the beginning of heating. Through the judgment of the flow velocity, the operation state of the valve is determined according to different conditions through the judgment of the flow velocity, and overheating or operation starting is avoided.

Preferably, the left side pipe, the right side pipe and the central pipe are respectively provided with a plurality of flow velocity sensing elements of n, and the flow velocity V of the current time period is calculated in sequence _i Flow rate Q of the previous time period _i-1 Difference D of _i ＝V _i -Q _i-1 And for n flow rate differences D _i Performing arithmetic cumulative summation

Preferably, when the first and third valves are opened and the second valve is closed and is lower than the threshold value, the controller controls the first and third valves to be closed and controls the second valve to be opened.

The running state of the valve is determined according to different conditions by the difference of the flow rates heated by different pipe boxes.

Preferably, if Y =0, the heating is judged according to the following:

if P is _i If the arithmetic mean of the first data is larger than or equal to the flow rate of the first data, the controller controls the opened valve to be closed and the closed valve to be opened when the flow rate of the first data is lower than a threshold value; wherein the first data is greater than the flow rate of the phase-change fluid after the phase change; preferably a flow rate at which the phase change fluid substantially changes phase;

if P is _i Is less than or equal to the flow rate of the second data, the controller controls the opened valve to continue to open and the closed valve to continue to remain closed when the flow rate of the second data is less than or equal to the flow rate at which the phase change of the phase-change fluid does not occur.

The first data is flow rate data in a fully heated state, and the second data is flow rate data in the absence of heating or in the beginning of heating. Through the judgment of the flow velocity, the operation state of the valve is determined according to different conditions, so that the alternate heating is realized.

Preferably, the period of time for measuring the flow rate is 1 to 10 minutes, preferably 3 to 6 minutes, and further preferably 4 minutes.

Preferably, the flow rate value may be an average flow rate value over a period of the time period. The flow rate at a certain time within the time period may also be used. For example, preferably both flow rates at the end of the time period.

Preferably, the flow velocity value may be an average flow velocity value in the left tube group and the right tube group.

The speed difference detected by the speed sensing element can enable the evaporation of the internal fluid to be basically saturated under the condition of meeting a certain speed (such as the highest upper limit), so that stable flow is formed, the speed of the internal fluid is basically not changed greatly, in such a case, the internal fluid is relatively stable, the vibration of the tube bundle at the moment is reduced, and therefore adjustment is needed, and the heat exchange component is changed, so that the fluid flows towards different directions. And new fluid is started to perform alternate heat exchange by detecting the speed change, so that the heat exchange effect and the descaling effect are improved.

Preferably, the speed sensing element is disposed at the free end. Through setting up at the free end, can perceive the speed change of free end to realize better control and regulation.

Preferably, the average temperatures of the first fluid, the second fluid and the third fluid are the same, the flow rate per unit time of the first fluid per unit time is equal to the flow rate per unit time of the third fluid, and the flow rate per unit time of the first fluid per unit time is 0.5 times the flow rate per unit time of the second fluid. The average temperature is an average of the fluid inlet temperature and the fluid outlet temperature.

Preferably, the first fluid, the second fluid and the third fluid are the same fluid.

As shown preferably in fig. 4, the first fluid, the second fluid and the third fluid have a common inlet header 27 and outlet header 28. Fluid enters the inlet header, enters the first heat exchange tube and the second heat exchange tube through the inlet header for heat exchange, and then flows out through the outlet header.

As shown preferably in fig. 5, the first, second and third fluids have respective inlet and outlet headers 29-30 and 31-32, respectively. The fluid enters the respective inlet headers, then enters the first heat exchange tubes, the second heat exchange tubes and the third heat exchange tubes through the inlet headers for heat exchange, and then flows out through the respective outlet headers.

Preferably, the bottom parts of the right channel box and the left channel box are provided with return pipes communicated with the central pipe, so that the fluid condensed in the first channel box and the second channel box can rapidly flow.

Preferably, the pipe diameter of the right side pipe is equal to that of the left side pipe. The pipe diameters of the right side pipe and the left side pipe are equal, so that the fluid can be ensured to be subjected to phase change in the first box body and keep the same transmission speed with the left pipe box.

Through the alternating heat exchange of the three fluids, the frequent vibration of the elastic coil can be realized, so that good descaling and heat exchange effects are realized, and the heat exchange power is basically the same in time.

Preferably, the annular tubes of the left tube group are distributed by taking the axis of the left tube as the center of a circle, and the annular tubes of the right tube group are distributed by taking the axis of the right tube as the center of a circle. The left side pipe and the right side pipe are arranged as circle centers, so that the distribution of the annular pipes can be better ensured, and the vibration and the heat exchange are uniform.

Preferably, the tube group is plural.

Preferably, the center tube 8, the left tube 21, and the right tube 22 are provided along the longitudinal direction.

Preferably, the left tube group 21 and the right tube group 22 are staggered in the longitudinal direction, as shown in fig. 3. Through the staggered distribution, can make to vibrate heat transfer and scale removal on different length for the vibration is more even, strengthens heat transfer and scale removal effect.

Preferably, the tube group 2 is provided in plural (for example, the same side (left side or right side)) along the length direction of the center tube 8, and the tube diameter of the tube group 2 (for example, the same side (left side or right side)) becomes larger along the flow direction of the fluid in the shell side.

Preferably, the pipe diameter of the annular pipe of the pipe group (for example, the same side (left side or right side)) is increased along the flowing direction of the fluid in the shell side.

The pipe diameter range through the heat exchange tube increases, can guarantee that shell side fluid outlet position fully carries out the heat transfer, forms the heat transfer effect like the adverse current, further strengthens the heat transfer effect moreover for whole vibration effect is even, and the heat transfer effect increases, further improves heat transfer effect and scale removal effect. Experiments show that better heat exchange effect and descaling effect can be achieved by adopting the structural design.

Preferably, the tube group on the same side (left side or right side) is provided in plural along the length direction of the center tube 8, and the distance between the adjacent tube groups on the same side (left side or right side) becomes smaller along the flow direction of the fluid in the shell side.

Preferably, the spacing between the tube banks on the same side (left or right) in the direction of fluid flow in the shell side is increased by a decreasing amount.

The interval amplitude through the heat exchange tube increases, can guarantee that shell side fluid outlet position fully carries out the heat transfer, forms the heat transfer effect like the adverse current, further strengthens the heat transfer effect moreover for the whole vibration effect is even, and the heat transfer effect increases, further improves heat transfer effect and scale removal effect. Experiments show that better heat exchange effect and descaling effect can be achieved by adopting the structural design.

In tests it was found that the tube diameter, distance of the left and

right side tubes

21, 22 and the central tube 8 and the tube diameter of the ring tubes can have an effect on the heat exchange efficiency and uniformity. If the distance between the collector is too big, then heat exchange efficiency is too poor, and the distance between the ring shape pipe is too little, then the ring shape pipe distributes too closely, also can influence heat exchange efficiency, and the pipe diameter size of collector and heat exchange tube influences the volume of the liquid or the steam that holds, then can exert an influence to the vibration of free end to influence the heat transfer. Therefore, the pipe diameters and distances of the left pipe 21, the right pipe 22, the central pipe 8 and the pipe diameters of the ring pipes have a certain relationship.

The invention provides an optimal size relation summarized by numerical simulation and test data of a plurality of heat pipes with different sizes. Starting from the maximum heat exchange amount in the heat exchange effect, nearly 200 forms are calculated. The dimensional relationship is as follows:

the distance between the center of the central tube 8 and the center of the left tube 21 is equal to the distance between the center of the central tube 8 and the center of the right tube 21, and is L, the distance between the center of the left tube 21 and the center of the right tube 21 is M, the tube diameter of the left tube 21, the tube diameter of the central tube 8, and the radius of the right tube 22 are R, the radius of the axis of the innermost annular tube in the annular tubes is R1, and the radius of the axis of the outermost annular tube is R2, so that the following requirements are met:

R1/R2= a × Ln (R/M) + b; wherein a and b are parameters, ln is a logarithmic function, wherein 0.5785 < a < 0.5805,1.6615 < b < 1.6625; preferably, a =0.579, b =1.6621.

Preferably, 35 < R < 61mm; l is more than 114 and less than 190mm; r1 is more than 69 and less than 121mm, R2 is more than 119 and less than 201mm. M =2L.

Preferably, the number of annular tubes of the tube set is 3-5, preferably 3 or 4.

Preferably, 0.55 < R1/R2 < 0.62; R/L is more than 0.3 and less than 0.33.

Preferably, 0.583 < R1/R2 < 0.615; R/L is more than 0.315 and less than 0.332.

Preferably, the radius of the annular tube is preferably 10-40mm; preferably 15 to 35mm, more preferably 20 to 30mm.

Preferably, the centers of the left tube 21, the right tube 22 and the center tube 8 are on a straight line.

Preferably, the arc between the ends of the free ends 3, 4 around the centre axis of the left tube is 95-130 degrees, preferably 120 degrees. The same applies to the curvature of the free ends 5, 6 and the free ends 3, 4. Through the design of the preferable included angle, the vibration of the free end is optimal, and therefore the heat exchange efficiency is optimal.

Preferably, the heat exchange component can be used as an immersed heat exchange assembly, heat exchange fluid immersed in the fluid, for example, the heat exchange component can be used as an air radiator heat exchange assembly, and can also be used as a water heater heat exchange assembly.

Preferably, the box body has a circular cross section, and is provided with a plurality of heat exchange components, wherein one heat exchange component is arranged at the center of the circular cross section (the center pipe is arranged at the center), and the other heat exchange components are distributed around the center of the circular cross section.

Preferably, the tube bundle of the tube bank 1 is an elastic tube bundle.

The heat exchange coefficient can be further improved by arranging the tube bundle of the tube group 1 with an elastic tube bundle.

The number of the pipe groups 1 is multiple, and the plurality of pipe groups 1 are in a parallel structure.

The heat exchanger shown in fig. 6 has a circular cross-sectional housing in which the plurality of heat exchange members are disposed. Preferably, the number of the heat exchange components is three, the center of the central tube of each heat exchange component is located at the midpoint of an inscribed regular triangle of the circular cross section, the connecting lines of the centers of the central tubes form the regular triangle, one heat exchange component is arranged at the upper part of each central tube, two heat exchange components are arranged at the lower part of each central tube, and the connecting lines formed by the left side tube, the right side tube and the centers of the central tubes of the heat exchange components are of a parallel structure. Through so setting up, can make and to fully reach vibrations and heat transfer purpose in can making the heat exchanger, improve the heat transfer effect.

Learn through numerical simulation and experiment, heat transfer part's size and circular cross-section's diameter have very big influence to the heat transfer effect, heat transfer part oversize can lead to adjacent interval too little, the space that the centre formed is too big, middle heat transfer effect is not good, the heat transfer is inhomogeneous, and on the same way, heat transfer part size undersize can lead to adjacent interval too big, leads to whole heat transfer effect not good. Therefore, the invention obtains the optimal size relation through a large amount of numerical simulation and experimental research.

The distance between the centers of the left side pipe and the right side pipe is L1, the side length of the inscribed regular triangle is L2, the radius of the axis of the innermost annular pipe in the annular pipes is R1, and the radius of the axis of the outermost annular pipe is R2, so that the following requirements are met:

10*(L1/L2)＝d*(10*R1/R2)-e*(10*R1/R2) ² -f; wherein d, e, f are parameters,

44.102＜d＜44.110，3.715＜e＜3.782，127.385＜f＜127.395；

further preferably, d =44.107, e =3.718, f =127.39;

of these, 720 < L2 < 1130mm is preferred. Preferably 0.58 < R1/R2 < 0.62.

Further preferably 0.30 < L1/L2 < 0.4.

Through the layout of the three heat exchange component structure optimization, the whole heat exchange effect can reach the best heat exchange effect.

Preferably, the pipe diameters of the left pipe and the right pipe are smaller than that of the middle pipe. The pipe diameter of the middle pipe is preferably 1.4-1.5 times of the pipe diameter of the left side pipe and the right side pipe. Through the pipe diameter setting of left side pipe, right side pipe and intermediate pipe, can guarantee that the fluid carries out the phase transition and keeps the same or close transmission speed at left side pipe, right side pipe and intermediate pipe to guarantee the homogeneity of conducting heat.

Preferably, the connection position of the coil pipe at the left channel box is lower than the connection position of the middle channel box and the coil pipe. This ensures that steam can rapidly enter the intermediate header. Similarly, the connecting position of the coil pipe at the right channel box is lower than the connecting position of the middle channel box and the coil pipe

Although the present invention has been described in connection with the preferred embodiments, it is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A shell-and-tube heat exchanger for communication cloud processing pressure difference adjustment comprises a shell, a heat exchange part, a shell side inlet connecting pipe and a shell side outlet connecting pipe; the heat exchange component is arranged in the shell and fixedly connected to the front tube plate and the rear tube plate; the shell pass inlet connecting pipe and the shell pass outlet connecting pipe are both arranged on the shell; the shell pass fluid enters from a shell pass inlet connecting pipe, exchanges heat through the heat exchange part and exits from a shell pass outlet connecting pipe;

the heat exchange component comprises a central tube, a left tube, a right tube and tube groups, wherein the tube groups comprise a left tube group and a right tube group, the left tube group is communicated with the left tube and the central tube, the right tube group is communicated with the right tube and the central tube, so that the central tube, the left tube, the right tube and the tube groups form heat exchange fluid closed circulation, phase change fluid is filled in the left tube and/or the central tube and/or the right tube, each tube group comprises a plurality of circular arc-shaped annular tubes, the end parts of the adjacent annular tubes are communicated, the annular tubes form a serial structure, and the end parts of the annular tubes form free ends of the annular tubes; the central tube comprises a first tube orifice and a second tube orifice, the first tube orifice is connected with the inlet of the left tube group, the second tube orifice is connected with the inlet of the right tube group, the outlet of the left tube group is connected with the left tube, and the outlet of the right tube group is connected with the right tube; the first pipe orifice and the second pipe orifice are arranged on the same side of the central pipe; the left pipe group and the right pipe group are in mirror symmetry along the plane of the axis of the central pipe;

the method is characterized in that the shell side fluid is a cold source, and the first fluid, the second fluid and the third fluid are heat sources; the inlets of the first heat exchange tube, the second heat exchange tube and the third heat exchange tube are respectively provided with a first valve, a second valve and a third valve, and the first valve, the second valve and the third valve are in data connection with the controller;

the left side pipe, the center tube, set up first pressure sensor in the right side pipe respectively, second pressure sensor and third pressure sensor, be used for detecting left side pipe, the intraductal pressure in center tube and the right side, first pressure sensor, second pressure sensor and third pressure sensor carry out data connection with the controller, the controller draws the pressure data of left side pipe, right side pipe and center tube according to time sequence, through the comparison of the pressure data of adjacent time quantum, acquire its pressure differential or the accumulative total of pressure differential change, the high in the clouds server is connected to the controller, the high in the clouds server is connected with the client, and wherein the controller transmits the accumulative total data of pressure differential or pressure differential change to the high in the clouds server, then conveys the client to through the high in the clouds server, the client is the cell-phone, cell-phone installation APP program, the user can select automatic control or manual control's mode at the client, and the controller controls the heat transfer according to the mode that the client selected.

2. The shell-and-tube heat exchanger according to claim 1, wherein in the manual control operation mode, a user obtains accumulated data of the pressure difference or the pressure difference variation according to a client, inputs a control signal manually at the client, and then transmits the control signal to the central controller through the cloud server, and the central controller controls the opening and closing of the first valve, the second valve and the third valve according to the signal input by the client.

3. A shell and tube heat exchanger according to claim 1, characterized in that in the automatic control mode of operation, the controller controls the opening and closing of the first valve, the second valve and the third valve according to the detected pressure difference or the accumulation of changes in pressure difference, thereby controlling whether the first fluid, the third fluid and the second fluid exchange heat.

4. A shell and tube heat exchanger according to claim 3, wherein when the first fluid, the third fluid exchanges heat and the second fluid does not exchange heat, if the left side tube pressure or the right side tube pressure or the average pressure of the left and right side tubes in the previous period is P1 and the left side tube pressure or the right side tube pressure or the average pressure of the left and right side tubes in the next subsequent period is P2, if the difference between P2 and P1 is lower than the threshold value, the controller controls the first valve, the third valve to be closed and the second valve to be opened, so that the first fluid, the third fluid stops exchanging heat and the second fluid exchanges heat; when the first fluid and the third fluid stop exchanging heat and the second fluid exchanges heat, if the pressure of the central tube in the previous time period is P1 and the pressure of the central tube in the adjacent subsequent time period is P2, if the difference value between P2 and P1 is lower than a threshold value, the controller controls the first valve and the third valve to be opened, and the second valve to be closed, so that the first fluid and the third fluid exchange heat and the second fluid stops exchanging heat.

5. A shell and tube heat exchanger according to claim 1, characterized in that the first and second nozzles are located on the upper side of the central tube.