A scale and corrosion prevention device, shell-and-tube heat exchanger, air conditioner and water heater

Abstract

The application discloses a kind of scale removal anticorrosion device, shell and tube heat exchanger, air conditioner and water heater, it is related to heat exchanger technical field, solve the technical problem that the magnetic field generated by electronic scale removal device in prior art is not perpendicular to water flow direction, resulting in poor scale removal effect.The scale removal anticorrosion device of the application, including pulse magnetic field generating assembly, the pulse magnetic field generating assembly includes pulse magnetic field generating device and pulse magnetic field power supply, the pulse magnetic field power supply is connected with the pulse magnetic field generating device and is used to make the pulse magnetic field generating device produce pulse magnetic field, the pulse magnetic field generating device is installed in the shell and tube heat exchanger shell tube water inlet pipe and makes the direction of pulse magnetic field produced and the water flow direction in shell course orthogonal.The scale removal anticorrosion device of the application not only can reduce the scale formation problem, but also can prevent corrosion.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchangers, in particular to a scale removal and corrosion prevention device, a shell-and-tube heat exchanger comprising the scale removal and corrosion prevention device, and an air conditioner and a water heater comprising the shell-and-tube heat exchanger. BACKGROUND

[0002] The shell-and-tube heat exchanger is widely used in the fields of chemical industry, commercial air conditioning, water heaters and the like, and is mainly composed of a shell, a tube sheet, heat transfer tubes, a tube box, a baffle and the like, and the required materials can be made of ordinary carbon steel, red copper, stainless steel and the like. When the shell-and-tube heat exchanger is used for heat exchange, one fluid enters the tube from the connecting pipe of the head, flows in the tube, and then flows out from the outlet pipe of the other end of the head, which is referred to as the tube side; the other fluid enters from the shell connecting pipe and flows out from the other shell connecting pipe, which is referred to as the shell side. Among them, the fluid in the shell side is cooling water in most application backgrounds, but the impurities and ions in the cooling water will cause scaling and corrosion problems if not properly controlled, which seriously affects the performance and service life of the shell-and-tube heat exchanger.

[0003] If scaling occurs in the tube, hard scale will form on the wall of the heat exchanger, and since the thermal conductivity of the scale is small (generally 1.5-2 kcal / m.h.℃), the heat transfer resistance increases, the heat load per unit area decreases, and the heat transfer efficiency of the condenser decreases, thereby causing a series of adverse consequences such as an increase in condensing pressure, an increase in power consumption, and a decrease in refrigeration coefficient. In order to enable the refrigeration system to operate safely and economically under normal conditions and to enable the condenser to have and maintain good heat transfer capacity, it is necessary to prevent scaling or clean the scale, and currently a scheme of periodically disassembling and cleaning the shell pipe is adopted to clean the scale. The use of disassembly to clean the scale requires reinstallation of the heat transfer medium, which is relatively high in cost; on the other hand, after disassembly and reinstallation, each connecting part needs to be tightened, which is complicated.

[0004] In the prior art, there is a scale-resistant heat exchanger, specifically, the prior art installs an electronic scale removal device in the tube box or / and the shell, and avoids scaling by emitting high-frequency and high-magnetic-field electromagnetic waves by the electronic scale removal device. However, the applicant finds that the existing electronic scale removal device is installed in the box pipe at both ends of the shell or / and the shell, so that the magnetic field generated by the electronic scale removal device is not perpendicular to the direction of the water flow, resulting in poor scale removal effect; on the other hand, the existing electronic scale removal device generally only has a scale prevention effect in the case of good water quality, and in the case of poor water quality, the scale prevention effect of the electronic scale removal device is not obvious due to insufficient transmission distance of the electromagnetic waves emitted by the electronic scale removal device, and if the transmission distance of the electromagnetic waves emitted by the electronic scale removal device is to be far enough, a large power is required, resulting in a narrow application range.

[0005] If corrosion occurs in the pipe, it will cause safety problems of the system and affect the service life of the shell and tube heat exchanger. Specifically, the corrosion failure of the shell and tube heat exchanger mostly occurs on the tube plate and the heat transfer pipe. During manufacturing, the welding of the tube plate and the heat transfer pipe generally adopts manual electric arc welding, and the weld shape has defects of different degrees, such as concave, porosity, slag inclusion, etc., and the distribution of weld stress is also uneven. Due to the existence of weld defects, the corrosion of the weld is caused by the galvanic cell reaction of the corrosive acid radical examples, metal high valence cations, oxygen and the like existing in the cooling water at the weld, thereby affecting the service life of the shell and tube heat exchanger. The greater the concentration of conductive impurities, the more likely it is to form a large area of anode and cathode, and the more serious the corrosion.

[0006] Therefore, there is an urgent need to provide a descaling and corrosion prevention device for a shell and tube heat exchanger. SUMMARY

[0007] One of the purposes of the present application is to provide a descaling and corrosion prevention device and a shell and tube heat exchanger, which solves the technical problem that the magnetic field generated by the electronic descaling device in the prior art is not perpendicular to the water flow direction, resulting in poor descaling effect. The technical effects that can be produced by the preferred technical solution of the present application are described in detail below.

[0008] To achieve the above-mentioned purposes, the present application provides the following technical solutions:

[0009] The descaling and corrosion prevention device of the present application comprises a pulse magnetic field generating assembly, the pulse magnetic field generating assembly comprises a pulse magnetic field generating device and a pulse magnetic field power supply, the pulse magnetic field power supply is connected with the pulse magnetic field generating device and is used for making the pulse magnetic field generating device generate a pulse magnetic field, and the pulse magnetic field generating device is installed in the shell and tube water inlet pipe of the shell and tube heat exchanger and makes the generated pulse magnetic field direction orthogonal to the water flow direction in the shell.

[0010] According to one preferred embodiment, the pulse magnetic field generating device comprises a female plug electrode, an insulating shell, an outer iron core, a number of enameled wire turns and an inner iron core, wherein the female plug electrode is connected with the pulse magnetic field power supply; the number of enameled wire turns is multiple, the enameled wire turns are formed by winding copper wire on the inner iron core, and the enameled wire turns are arranged in the outer iron core; the female plug electrode, the outer iron core, the enameled wire turns and the inner iron core are arranged in the insulating shell.

[0011] According to one preferred embodiment, the pulse magnetic field generating device further comprises at least one fastener, the fastener is arranged in the insulating shell, and the fastener is used for fixing the insulating shell in the shell and tube water inlet pipe of the shell and tube heat exchanger.

[0012] According to a preferred embodiment, the pulse magnetic field generating device further comprises a polyimide film, which is arranged between turns and / or layers of the enameled wire turns.

[0013] According to a preferred embodiment, the insulating shell is made of thermosetting plastic, and the thermosetting plastic is made of one or more of GF chopped glass fiber, MD filler calcium carbonate and phenolic resin.

[0014] According to a preferred embodiment, the outer iron core and the inner iron core are oriented silicon steel sheets.

[0015] According to a preferred embodiment, the enameled wire turns have 2 layers, and the gap between adjacent two layers is 0.2 mm; each layer has 4 groups, and each group has 25 turns, and the gap between adjacent two turns is 0.2 mm; the height of each group of coils is 30 mm, the height of the inner iron core is 50 mm; and the diameter of the copper wire is 1.0 mm.

[0016] According to a preferred embodiment, the pulse magnetic field power supply comprises a boost and voltage stabilization circuit, a rectification and filtering circuit, a charging circuit, a discharging circuit and a control circuit, wherein the boost and voltage stabilization circuit is connected with an external power frequency alternating current power supply, the boost and voltage stabilization circuit is also connected with the rectification and filtering circuit, and the power frequency alternating current passing through the boost and voltage stabilization circuit and the rectification and filtering circuit becomes direct current without pulsation component; the rectification and filtering circuit is also connected with the charging circuit, and the energy storage capacitor in the charging circuit is charged by direct current; the discharging circuit is connected with the control circuit, and when the control circuit receives an external pulse signal, the control circuit is used to control the discharging circuit to discharge the pulse magnetic field generating device and make the pulse magnetic field generating device generate a pulse magnetic field.

[0017] According to a preferred embodiment, the pulse magnetic field power supply further comprises a collection circuit, which is connected with the charging circuit and the discharging circuit, and is used to collect the electric energy in the discharging circuit and charge the energy storage capacitor in the charging circuit.

[0018] According to a preferred embodiment, the boost and voltage stabilization circuit comprises a transformer and a first capacitor, the transformer and the first capacitor are connected in series, the transformer is also connected with an external power frequency alternating current power supply, and the transformer is used to boost or step down the power frequency alternating current, and the first capacitor is used to stabilize the voltage of the power frequency alternating current.

[0019] According to a preferred embodiment, the rectification and filtering circuit comprises a first diode, a second diode and a first resistor, the first diode is connected with the second diode and the first resistor, and the first diode is also connected with the transformer.

[0020] According to a preferred embodiment, the industrial frequency AC power is 220V, and after being processed by the boost and voltage stabilization circuit and the rectifier and filter circuit, it becomes 200-380V DC power. According to a preferred embodiment, the charging circuit includes a second capacitor, and the DC power processed by the rectifier and filter circuit is used to charge the second capacitor. The input current when charging the second capacitor is no more than 20A, and the input current at the end of charging is no more than 2A. The charging voltage is 200-380V, and the charging time is 0.2s.

[0021] According to a preferred embodiment, the discharge circuit is a thyristor, and based on a received external pulse signal, the control circuit controls the thyristor to discharge the pulse magnetic field generating device and enable the pulse magnetic field generating device to generate a pulse magnetic field.

[0022] According to a preferred embodiment, the discharge time of the thyristor is 0.2s, and the maximum discharge current is 5kA.

[0023] According to a preferred embodiment, the descaling and corrosion prevention device also includes a magnesium rod assembly, which is installed in the shell of the shell and tube heat exchanger or in the shell and tube water inlet pipe, and allows the magnesium rod assembly to react with corrosive ions in the water to produce a galvanic reaction and reduce the concentration of corrosive ions.

[0024] According to a preferred embodiment, the magnesium rod assembly includes a magnesium rod, a core rod, an insulating block, a stainless steel nut and a potential-reducing resistor, wherein the insulating block is arranged on the magnesium rod, the core rod passes through the magnesium rod and the insulating block and is fixed by the stainless steel nut; the potential-reducing resistor is fixed on the stainless steel nut.

[0025] According to a preferred embodiment, the magnesium rod assembly further includes a magnesium rod mounting joint, an insulating cover and a magnesium rod fastening joint, wherein the magnesium rod, the core rod, the insulating block, the stainless steel nut and the potential-dropping resistor are located in the magnesium rod mounting joint; the insulating cover is located in the magnesium rod mounting joint and above the stainless steel nut and the potential-dropping resistor, and the magnesium rod fastening joint is fixed above the insulating cover.

[0026] The shell and tube heat exchanger of the present invention comprises a body and a descaling and anti-corrosion device, wherein the descaling and anti-corrosion device is the descaling and anti-corrosion device described in any technical solution of the present invention.

[0027] The descaling and corrosion prevention device and shell-and-tube heat exchanger provided by the present invention have at least the following beneficial technical effects:

[0028] The scale removing and corrosion preventing device of the present application can reduce the scale formation and corrosion problems of the shell-and-tube heat exchanger, and can improve the performance and service life of the shell-and-tube heat exchanger.

[0029] The scale removing and corrosion preventing device of the present application can reduce the scale formation and corrosion problems of the shell-and-tube heat exchanger, and can improve the performance and service life of the shell-and-tube heat exchanger.

[0030] The scale removing and corrosion preventing device of the present application can reduce the scale formation and corrosion problems of the shell-and-tube heat exchanger, and can improve the performance and service life of the shell-and-tube heat exchanger.

[0031] In addition, the preferred technical solution of the present application can also produce the following technical effects:

[0032] The scale removing and corrosion preventing device of the present application can reduce the scale formation and corrosion problems of the shell-and-tube heat exchanger, and can improve the performance and service life of the shell-and-tube heat exchanger.

[0033] Another object of the present invention is to provide an air conditioner and a heat exchanger.

[0034] The air conditioner of the present invention includes the shell-and-tube heat exchanger according to any one of the technical solutions of the present invention. Because the performance and lifespan of the shell-and-tube heat exchanger according to any one of the technical solutions of the present invention are improved compared to existing shell-and-tube heat exchangers, the air conditioner of the present invention also has correspondingly improved performance and lifespan compared to existing air conditioners.

[0035] The water heater of the present invention includes the shell-and-tube heat exchanger according to any one of the technical solutions of the present invention. Because the performance and lifespan of the shell-and-tube heat exchanger according to any one of the technical solutions of the present invention are improved compared to existing shell-and-tube heat exchangers, the water heater of the present invention also has correspondingly improved performance and lifespan compared to existing water heaters. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 is a first schematic diagram of a preferred embodiment of the shell and tube heat exchanger of the present invention;

[0038] Figure 2 is a second schematic diagram of a preferred embodiment of the shell and tube heat exchanger of the present invention;

[0039] Figure 3 yes Figure 2 Enlarged view of part A;

[0040] Figure 4 yes Figure 2 EE cross-sectional view;

[0041] Figure 5 is a schematic diagram of a preferred embodiment of a pulsed magnetic field generating assembly of the present invention;

[0042] Figure 6 yes Figure 3 FF cross-sectional view;

[0043] Figure 7 yes Figure 3 GG cross-sectional view;

[0044] Figure 8 This is a first schematic diagram of a preferred embodiment of the magnesium rod assembly of the present invention;

[0045] Figure 9 is the second schematic view of the preferred embodiment of the magnesium rod assembly of the present application;

[0046] Figure 10 is the third schematic view of the preferred embodiment of the magnesium rod assembly of the present application;

[0047] Figure 11 is the schematic view of the installation of the potential reducing resistor of the present application.

[0048] In the figure: 1, shell; 2, shell pipe water inlet pipe; 3, pulse magnetic field generating assembly; 311, female plug electrode; 312, fastener; 313, insulating shell; 314, outer iron core; 315, enameled wire turns; 316, inner iron core; 317, polyimide film; 318, pulse magnetic field direction; 4, magnesium rod assembly; 41, magnesium rod; 42, core rod; 43, magnesium rod mounting joint; 44, insulating block; 45, stainless steel nut; 46, potential reducing resistor; 47, insulating cover; 48, magnesium rod fastening joint. DETAILED DESCRIPTION

[0049] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described in detail below. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.

[0050] The present application will be described in detail below with reference to the accompanying drawings and the embodiments 1-4. Figures 1-11 The scale and corrosion preventing device, shell and tube heat exchanger, air conditioner and water heater of the present application will be described in detail below.

[0051] Embodiment 1

[0052] The scale and corrosion preventing device of the present application will be described in detail in this embodiment.

[0053] The scale and corrosion preventing device of the present application will be described in detail in this embodiment. Figures 2-6 As shown in the figure. Preferably, the pulse magnetic field generating assembly 3 comprises a pulse magnetic field generating device and a pulse magnetic field power supply, the pulse magnetic field power supply is connected with the pulse magnetic field generating device and is used for making the pulse magnetic field generating device generate a pulse magnetic field, the pulse magnetic field generating device is installed in the shell pipe water inlet pipe 2 of the shell and tube heat exchanger and makes the generated pulse magnetic field direction orthogonal to the water flow direction in the shell side, as shown in the figures. Figure 5 Figure 6 As shown in the figures. Figure 6 ​It can be seen that the direction of the flow of the cooling water in the shell tube water inlet pipe 2 and the direction of the pulsed magnetic field 318 at a certain moment (the next moment will cause oscillation to cause the direction of the pulsed magnetic field 318 to be reversed) can always be orthogonal, so that the pulsed magnetic field can be used to efficiently pulse the orthogonal magnetization of the cooling water and other heat exchange fluids.

[0054] The scale removal and corrosion prevention device of the present embodiment can generate a pulsed magnetic field whose direction is orthogonal to the direction of the water flow in the shell side, that is, the pulsed magnetic field generating assembly of the present embodiment can generate an efficient orthogonal pulsed magnetic field, which can efficiently pulse the magnetization of the cooling water in the shell side, promote the growth of aragonite form of scale, change the crystallization mode of scale, and facilitate the removal of loose original scale and scale removal, thereby reducing the occurrence of scale problems. On the other hand, due to the effect of the orthogonal pulsed magnetic field, the transport capacity and activity of the cooling water for impurities can also be increased, and the activation ions that cause corrosion can be reduced, thereby preventing corrosion. That is, when the scale removal and corrosion prevention device of the present embodiment is applied to a shell-and-tube heat exchanger, the scale and corrosion problems of the shell-and-tube heat exchanger can be reduced, and compared with the shell-and-tube heat exchanger in the prior art, the performance and service life of the shell-and-tube heat exchanger can be improved.

[0055] The scale removal and corrosion prevention device of the present embodiment can generate a pulsed magnetic field whose direction is orthogonal to the direction of the water flow in the shell side, that is, the pulsed magnetic field generating assembly of the present embodiment can generate an efficient orthogonal pulsed magnetic field, which can efficiently pulse the magnetization of the cooling water in the shell side, promote the growth of aragonite form of scale, change the crystallization mode of scale, and facilitate the removal of loose original scale and scale removal, thereby reducing the occurrence of scale problems. On the other hand, due to the effect of the orthogonal pulsed magnetic field, the transport capacity and activity of the cooling water for impurities can also be increased, and the activation ions that cause corrosion can be reduced, thereby preventing corrosion. That is, when the scale removal and corrosion prevention device of the present embodiment is applied to a shell-and-tube heat exchanger, the scale and corrosion problems of the shell-and-tube heat exchanger can be reduced, and compared with the shell-and-tube heat exchanger in the prior art, the performance and service life of the shell-and-tube heat exchanger can be improved.

[0056] According to a preferred embodiment, the pulsed magnetic field generating device comprises a female plug electrode 311, an insulating shell 313, an outer iron core 314, a varnished wire turn 315, and an inner iron core 316, as shown in Figure 5 Preferably, the female plug electrode 311 is connected with a pulsed magnetic field power supply; the number of varnished wire turns 315 is multiple, the varnished wire turns 315 are formed by winding copper wire on the inner iron core 316, and the varnished wire turns 315 are arranged in the outer iron core 314; the female plug electrode 311, the outer iron core 314, the varnished wire turns 315, and the inner iron core 316 are arranged in the insulating shell 313, as shown in Figure 5 The number of varnished wire turns 315 in the preferred technical solution of the present embodiment is multiple, so that the pulsed magnetic field generating device is a multi-electrode emitter, thereby improving the transmission distance of electromagnetic waves, and further improving the scale removal and corrosion prevention effect of the scale removal and corrosion prevention device, and expanding the application range. On the other hand, the preferred technical solution of the present embodiment can change the distribution of the pulsed magnetic field generated by the pulsed magnetic field generating device by arranging the outer iron core 314 and the inner iron core 316, and can also enhance the local magnetic field strength, thereby ensuring the uniformity of the end face magnetic field distribution.

[0057] According to a preferred embodiment, the pulse magnetic field generating device further comprises fasteners 312, as shown in FIG. 3. Preferably, the number of fasteners 312 is at least one, the fasteners 312 are arranged in the insulating shell 313, and the fasteners 312 are used to fix the insulating shell 313 in the shell-and-tube heat exchanger shell tube water inlet pipe 2, as shown in FIG. 4. More preferably, the number of fasteners 312 is four, and the fasteners 312 are respectively located at the four corners of the insulating shell 313, as shown in FIG. 5. The pulse magnetic field generating device of the preferred technical solution of the present embodiment further comprises fasteners 312, and the insulating shell 313 can be fixed in the shell-and-tube heat exchanger shell tube water inlet pipe 2 through the action of the fasteners 312, so as to realize the installation and fixation of the pulse magnetic field generating device. Figure 5 Figures 5-7 Figure 5

[0058] According to a preferred embodiment, the pulse magnetic field generating device further comprises a polyimide film 317, as shown in FIG. 3. Preferably, the polyimide film 317 is arranged between turns and / or layers of the enameled wire turns 315. The pulse magnetic field generating device of the preferred technical solution of the present embodiment further comprises a polyimide film 317, and the polyimide film 317 is added between turns and / or layers of the enameled wire turns 315 during the winding process, so as to enhance the insulation level between turns and / or layers of the enameled wire turns 315, thereby improving the performance of the pulse magnetic field generating device. Figure 5

[0059] According to a preferred embodiment, the insulating shell 313 is made of thermosetting plastic. Preferably, the thermosetting plastic is made of one or more of GF chopped glass fiber, MD filler calcium carbonate, and phenolic resin. More preferably, the thermosetting plastic is mixed by GF chopped glass fiber, MD filler calcium carbonate, and phenolic resin in a mobile ratio. The insulating shell 313 of the preferred technical solution of the present embodiment is made of thermosetting plastic, which can enhance the curing effect and insulation effect.

[0060] According to a preferred embodiment, the outer iron core 314 and the inner iron core 316 are oriented silicon steel sheets. The outer iron core 314 and the inner iron core 316 of the preferred technical solution of the present embodiment are oriented silicon steel sheets, which can help to reduce iron loss and improve the consistency of the magnetic field direction, thereby being more conducive to energy saving and efficiency improvement of the pulse magnetic field generating device.

[0061] ​​​​According to a preferred embodiment, the number of layers of the enameled wire turns 315 is 2 layers, the gap between the adjacent two layers is 0.2 mm; the number of groups of each layer is 4 groups, the number of turns of each group is 25 turns, the gap between the adjacent two turns is 0.2 mm; the height of each group of coils is 30 mm, the height of the inner core 316 is 50 mm; the diameter of the copper wire is 1.0 mm. The enameled wire turns 315 of the preferred technical solution of the present embodiment maintain the set parameters, which is not only conducive to energy saving and efficiency improvement of the pulse magnetic field generating device, but also conducive to descaling and corrosion prevention. Without limitation, the enameled wire turns 315 of the preferred technical solution of the present embodiment can also be the remaining set parameters

[0062] According to a preferred embodiment, the pulse magnetic field power supply includes a boost and voltage stabilization circuit, a rectification and filtering circuit, a charging circuit, a discharging circuit and a control circuit, as shown in Figure 5 . Preferably, the boost and voltage stabilization circuit is connected with an external power frequency alternating current power supply, and the boost and voltage stabilization circuit is also connected with the rectification and filtering circuit, and makes the power frequency alternating current passing through the boost and voltage stabilization circuit and the rectification and filtering circuit into direct current without pulsation component. Preferably, the rectification and filtering circuit is also connected with the charging circuit, and charges the energy storage capacitor in the charging circuit through direct current. Preferably, the discharging circuit is connected with the control circuit, and when the control circuit receives an external pulse signal, the control circuit is used to control the discharging circuit to discharge the pulse magnetic field generating device and make the pulse magnetic field generating device generate a pulse magnetic field. More preferably, the power frequency alternating current is 220 V, and after being processed by the boost and voltage stabilization circuit and the rectification and filtering circuit, it becomes 200-380 V direct current. Through the action of the pulse magnetic field power supply, the preferred technical solution of the present embodiment can provide a pulse power supply for the pulse magnetic field generating device, so as to make the pulse magnetic field generating device generate a pulse magnetic field. Further, through the action of the rectification and filtering circuit, the pulse magnetic field power supply of the preferred technical solution of the present embodiment can change the power frequency alternating current into direct current without pulsation component, so as to provide a more stable power supply for the pulse magnetic field generating device, and also reduce the power loss.

[0063] According to a preferred embodiment, the pulse magnetic field power supply further includes a collection circuit, the collection circuit is connected with the charging circuit and the discharging circuit, and the collection circuit is used to collect the electric energy in the discharging circuit and charge the energy storage capacitor in the charging circuit, as shown in Figure 5 . The pulse magnetic field power supply of the preferred technical solution of the present embodiment further includes a collection circuit, through which the energy storage capacitor in the charging circuit can be charged in reverse, so as to not only reduce the energy consumption and save the electric energy, but also improve the charging and discharging efficiency.

[0064] According to one preferred embodiment, the voltage boosting and stabilizing circuit comprises a transformer TF and a first capacitor C1, the transformer TF and the first capacitor C1 are connected in series, the transformer TF is further connected with the external power frequency alternating current power supply, and the transformer TF is used for boosting or reducing the power frequency alternating current, and the first capacitor C1 is used for stabilizing the power frequency alternating current, as shown in Figure 5 The voltage boosting and stabilizing circuit of the preferred technical solution of the embodiment comprises the transformer TF and the first capacitor C1, the voltage of the power frequency alternating current can be converted through the action of the transformer TF, and the stability of the power supply can be enhanced through the action of the first capacitor C1.

[0065] According to one preferred embodiment, the rectification and filtering circuit comprises a first diode D1, a second diode D2 and a first resistor R1, the first diode D1 is connected with the second diode D2 and the first resistor R1, and the second diode D2 is further connected with the transformer TF, as shown in Figure 5 The rectification and filtering circuit of the preferred technical solution of the embodiment comprises the first diode D1, the second diode D2 and the first resistor R1, the power frequency alternating current can be converted into direct current without pulsating components through the rectification and filtering action of the first diode D1, the second diode D2 and the first resistor R1, then the direct current is used to charge the energy storage capacitor, which can provide more stable electric energy for the energy storage capacitor, is conducive to saving electric energy and improving the charging efficiency.

[0066] According to one preferred embodiment, the charging circuit comprises a second capacitor C2, as shown in Figure 5 The direct current processed by the rectification and filtering circuit is used to charge the second capacitor C2, the input current when charging the second capacitor C2 is not greater than 20A, the input current when the charging is completed is not greater than 2A, the charging voltage is 200-380V, and the charging time is 0.2s. The preferred technical solution of the embodiment can make the end face magnetic field strength reach 0.5T under the condition that the second capacitor C2 is 1000uF when charging the second capacitor C2 under the set parameters. Not limited to this, the preferred technical solution of the embodiment can also be charged under the remaining set parameters.

[0067] According to one preferred embodiment, the discharging circuit is a silicon controlled rectifier Q, based on the received external pulse signal, the control circuit controls the silicon controlled rectifier Q to discharge the pulse magnetic field generating device and make the pulse magnetic field generating device generate a pulse magnetic field, as shown in Figure 5 The preferred discharging time of the silicon controlled rectifier Q is 0.2s, and the maximum discharging current is 5kA. The preferred control circuit is an IC chip, the IC chip provides waveforms with different pulse sequences to control the first relay K1 and the second relay K2 in the pulse magnetic field power supply to charge and discharge oscillation, so as to generate a pulse magnetic field. The silicon controlled rectifier Q of the preferred technical solution of the embodiment can make the generated pulse magnetic field conducive to descaling and corrosion prevention under the set parameters.

[0068] The pulse magnetic field power supply of the preferred technical solution of the embodiment can reach 200 mega-ohms of the primary-secondary insulation resistance and the primary-ground resistance in the loop when conducting insulation test, which indicates that the pulse magnetic field power supply of the preferred technical solution of the embodiment has a high insulation level.

[0069] According to a preferred embodiment, the scale and corrosion prevention device further comprises a magnesium rod assembly 4 installed in the shell 1 of the shell-and-tube heat exchanger or in the shell tube water inlet pipe 2, and the magnesium rod assembly 4 reacts with the corrosive ions in the water to reduce the concentration of the corrosive ions, as shown in Figures 2-4 、 Figures 8-10 The scale and corrosion prevention device of the preferred technical solution of the present application further comprises a magnesium rod assembly 4, which can react with oxygen, corrosive acid ions, and metal high-valence cations in the cooling water through the action of the magnesium rod assembly 4, thereby consuming the corrosive ions in the cooling water and inhibiting the original cell reaction of the corrosive ions at the welds, and further achieving the purpose of protecting the internal structural components and high-efficiency heat exchange tube bundles of the shell-and-tube heat exchanger. On the other hand, the magnesium ion hydroxide produced can be prevented from depositing and scaling through the magnetization of the cooling water by the pulse magnetic field generated by the pulse magnetic field generating device, thereby ensuring the overall heat exchange capacity of the shell-and-tube heat exchanger and preventing under-deposit corrosion. That is, the scale and corrosion prevention device of the preferred technical solution of the embodiment can further significantly improve the performance and service life of the shell-and-tube heat exchanger through the action of the magnesium rod assembly 4.

[0070] According to a preferred embodiment, the magnesium rod assembly 4 comprises a magnesium rod 41, a core rod 42, an insulating block 44, a stainless steel nut 45, and a potential lowering resistor 46, as shown in Figure 9 Preferably, the insulating block 44 is arranged on the magnesium rod 41, the core rod 42 penetrates through the magnesium rod 41 and the insulating block 44 and is fixed by the stainless steel nut 45; and the potential lowering resistor 46 is fixed on the stainless steel nut 45, as shown in Figures 8-11The insulation block 44 is preferably a ceramic body. The core rod 42 is preferably used to support the magnesium rod 41. The potential reducing resistor 46 is preferably welded to the stainless steel nut 45. More preferably, the potential reducing resistor 46 is used to control the potential difference of the magnesium rod 41 and the corrosion current to be about 0.25 mA. Since the corrosion potential of the magnesium rod 41 is low, it is prone to galvanic reaction with oxygen, corrosive acid ions, metal high-valence cations and the like in the cooling water. Even in the case of good water quality, the magnesium rod 41 is consumed quickly, and in the case of poor water quality, the magnesium rod 41 is consumed even faster, and when the magnesium rod 41 is consumed, the protection effect disappears. The magnesium rod assembly 4 of the preferred technical solution of the embodiment includes the potential reducing resistor 46, and through the action of the potential reducing resistor 46, the protective electric field formed between the magnesium rod 41 and the shell can be weakened, so that the consumption of the magnesium rod 41 is slowed down, and in the case of poor water quality, the protection effect can also be achieved. On the other hand, the magnesium rod assembly 4 of the preferred technical solution of the embodiment also includes the insulation block 44, and through the action of the insulation block 44, the potential reducing resistor 46 can be isolated from the magnesium rod 41, so that the protective electric field formed between the magnesium rod 41 and the shell 1 can be weakened.

[0071] According to a preferred embodiment, the magnesium rod assembly 4 further includes a magnesium rod mounting joint 43, an insulation cover 47 and a magnesium rod fastening joint 48, as shown in Figure 9 and Figure 10 Preferably, the magnesium rod 41, the core rod 42, the insulation block 44, the stainless steel nut 45 and the potential reducing resistor 46 are located in the magnesium rod mounting joint 43; the insulation cover 47 is located in the magnesium rod mounting joint 43 and above the stainless steel nut 45 and the potential reducing resistor 46, and the magnesium rod fastening joint 48 is fixed above the insulation cover 47, as shown in Figure 9 and Figure 10 Preferably, the insulation cover 47 can be a plastic cover. The magnesium rod assembly 4 of the preferred technical solution of the embodiment further includes the magnesium rod mounting joint 43, and through the action of the magnesium rod mounting joint 43, the installation and fixation of the magnesium rod 41 can be achieved, specifically the magnesium rod 41 can be installed in the shell 1 of the shell-and-tube heat exchanger or in the shell tube water inlet pipe 2. On the other hand, the magnesium rod assembly 4 of the preferred technical solution of the embodiment further includes the insulation cover 47, and through the action of the insulation cover 47, the potential reducing resistor 46 can be isolated from the shell 1 and the shell tube water inlet pipe 2, so that the protective electric field formed between the magnesium rod 41 and the shell 1 can be weakened.

[0072] Embodiment 2

[0073] The shell-and-tube heat exchanger of the present application is described in detail in the embodiment.

[0074] The shell-and-tube heat exchanger of the embodiment includes a body and a scale removal and corrosion prevention device, as shown in Figure 1 and Figure 2The fouling and corrosion prevention device is preferably the fouling and corrosion prevention device of any one of the technical solutions in Embodiment 1. The structure of the body can be the same as that of the prior art, which will not be repeated here. The shell-and-tube heat exchanger of the embodiment can be used in a working condition with good water quality, and can also be used in a working condition with poor water quality, and has a wide range of applications.

[0075] The shell-and-tube heat exchanger of the embodiment includes the fouling and corrosion prevention device of any one of the technical solutions in Embodiment 1. Since the fouling and corrosion prevention device can reduce the occurrence of the structure problem of the cooling water and prevent the corrosion of the shell pipe, the performance and service life of the shell-and-tube heat exchanger can be improved.

[0076] Embodiment 3

[0077] The air conditioner of the embodiment is described in detail.

[0078] The air conditioner of the embodiment includes the shell-and-tube heat exchanger of any one of the technical solutions in Embodiment 2. The remaining structure of the air conditioner of the embodiment can be the same as that of the prior art, which will not be repeated here. Preferably, the air conditioner of the embodiment is a chemical commercial air conditioner. The air conditioner of the embodiment includes the shell-and-tube heat exchanger of any one of the technical solutions in Embodiment 2. Since the performance and service life of the shell-and-tube heat exchanger of any one of the technical solutions in Embodiment 2 are improved compared with those of the existing shell-and-tube heat exchanger, the performance and service life of the air conditioner of the embodiment are correspondingly improved compared with those of the existing air conditioner.

[0079] Embodiment 4

[0080] The water heater of the embodiment is described in detail.

[0081] The water heater of the embodiment includes the shell-and-tube heat exchanger described in any one of the technical solutions in Embodiment 2. The remaining structure of the water heater of the embodiment can be the same as that of the prior art, which will not be repeated here. The water heater of the embodiment includes the shell-and-tube heat exchanger of any one of the technical solutions in Embodiment 2. Since the performance and service life of the shell-and-tube heat exchanger of any one of the technical solutions in Embodiment 2 are improved compared with those of the existing shell-and-tube heat exchanger, the performance and service life of the water heater of the embodiment are correspondingly improved compared with those of the existing water heater.

[0082] In the description of the present application, it should be noted that, unless otherwise specified, the meaning of "a plurality of" is two or more; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0083] In the description of the application, it also needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, or indirectly connected through intermediate medium. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0084] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A descaling and corrosion prevention device, characterized in that: The invention comprises a pulse magnetic field generating assembly (3), wherein the pulse magnetic field generating assembly (3) comprises a pulse magnetic field generating device and a pulse magnetic field power supply, wherein the pulse magnetic field power supply is connected to the pulse magnetic field generating device and is used to enable the pulse magnetic field generating device to generate a pulse magnetic field, wherein the pulse magnetic field generating device is installed in a shell and tube water inlet pipe (2) of a shell and tube heat exchanger and enables the direction of the generated pulse magnetic field to be orthogonal to the direction of water flow in the shell side; The pulse magnetic field generating device comprises a female plug electrode (311), an insulating shell (313), an outer iron core (314), an enameled wire turn (315), and an inner iron core (316), wherein the female plug electrode (311) is connected to the pulse magnetic field power supply; the number of the enameled wire turns (315) is multiple, the enameled wire turns (315) are formed by winding copper wire on the inner iron core (316), and the enameled wire turns (315) are arranged in the outer iron core (314); the female plug electrode (311), the outer iron core (314), the enameled wire turns (315), and the inner iron core (316) are arranged in the insulating shell (313); The outer iron core (314) and the inner iron core (316) are oriented silicon steel sheets; It also includes a magnesium rod assembly (4), which is installed in the shell (1) of the shell and tube heat exchanger or in the shell and tube water inlet pipe (2), and causes the magnesium rod assembly (4) to react with corrosive ions in water to generate a galvanic cell reaction and reduce the concentration of the corrosive ions; The magnesium rod assembly (4) comprises a magnesium rod (41), a core rod (42), an insulating block (44), a stainless steel nut (45) and a potential-dropping resistor (46), wherein the insulating block (44) is arranged on the magnesium rod (41), the core rod (42) passes through the magnesium rod (41) and the insulating block (44) and is fixed by the stainless steel nut (45); the potential-dropping resistor (46) is fixed on the stainless steel nut (45); The magnesium rod assembly (4) further comprises a magnesium rod mounting joint (43), an insulating cover (47) and a magnesium rod fastening joint (48), wherein the magnesium rod (41), the core rod (42), the insulating block (44), the stainless steel nut (45) and the potential-reducing resistor (46) are located in the magnesium rod mounting joint (43); the insulating cover (47) is located in the magnesium rod mounting joint (43) and above the stainless steel nut (45) and the potential-reducing resistor (46), and the magnesium rod fastening joint (48) is fixed above the insulating cover (47); The pulse magnetic field generating device further comprises a fastener (312), the number of the fastener (312) being at least one, the fastener (312) being arranged in the insulating shell (313), and the fastener (312) being used to fix the insulating shell (313) in the shell and tube water inlet pipe (2) of the shell and tube heat exchanger.

2. The descaling and corrosion prevention device according to claim 1, characterized in that: The pulsed magnetic field generating device further comprises a polyimide film (317), wherein the polyimide film (317) is arranged between turns and / or between layers of the enameled wire turns (315).

3. The descaling and corrosion prevention device according to claim 1, characterized in that: The insulating shell (313) is made of thermosetting plastic, and the thermosetting plastic is made of one or more of GF chopped glass fiber, MD filler calcium carbonate, and phenolic resin.

4. The descaling and corrosion prevention device according to claim 1, characterized in that: The number of layers of the enameled wire turns (315) is 2, and the gap between two adjacent layers is 0.2 mm; the number of groups in each layer is 4, the number of turns in each group is 25, and the gap between two adjacent turns is 0.2 mm; the height of each coil group is 30 mm, and the height of the inner iron core (316) is 50 mm; the diameter of the copper wire is 1.0 mm.

5. The descaling and corrosion prevention device according to claim 1, characterized in that: The pulse magnetic field power supply includes a boost and voltage stabilization circuit, a rectifier and filter circuit, a charging circuit, a discharge circuit and a control circuit, wherein: The boost and voltage stabilizing circuit is connected to an external industrial frequency AC power source, and is also connected to the rectifier and filter circuit, and converts the industrial frequency AC power passing through the boost and voltage stabilizing circuit and the rectifier and filter circuit into a pulsating DC power; The rectifier and filter circuit is also connected to the charging circuit and charges the energy storage capacitor in the charging circuit through direct current; The discharge circuit is connected to the control circuit. When the control circuit receives an external pulse signal, the control circuit is used to control the discharge circuit to discharge the pulse magnetic field generating device and enable the pulse magnetic field generating device to generate a pulse magnetic field.

6. The descaling and corrosion prevention device according to claim 5, characterized in that: The pulsed magnetic field power supply further includes a collection circuit, which is connected to the charging circuit and the discharging circuit. The collection circuit is used to collect electrical energy in the discharging circuit and to charge the energy storage capacitor in the charging circuit.

7. The descaling and corrosion prevention device according to claim 5, characterized in that: The boost and voltage stabilization circuit includes a transformer and a first capacitor, the transformer and the first capacitor are connected in series, the transformer is also connected to an external industrial frequency AC power supply, and the transformer is used to boost or step down the industrial frequency AC power, and the first capacitor is used to stabilize the industrial frequency AC power.

8. The descaling and corrosion prevention device according to claim 5, characterized in that: The rectification and filtering circuit includes a first diode, a second diode and a first resistor. The first diode is connected to the second diode and the first resistor, and the second diode is also connected to the transformer.

9. The descaling and corrosion prevention device according to claim 5, characterized in that: The industrial frequency alternating current is 220V, and after being processed by the boost and voltage stabilization circuit and the rectifier and filter circuit, it becomes 200-380V direct current.

10. The descaling and corrosion prevention device according to claim 5, characterized in that: The charging circuit includes a second capacitor, and the direct current processed by the rectifier and filter circuit is used to charge the second capacitor. The input current when charging the second capacitor is not greater than 20A, and the input current at the end of charging is not greater than 2A. The charging voltage is 200~380V, and the charging time is 0.2s.

11. The descaling and corrosion prevention device according to claim 5, characterized in that: The discharge circuit is a thyristor. Based on the received external pulse signal, the control circuit controls the thyristor to discharge the pulse magnetic field generating device and enable the pulse magnetic field generating device to generate a pulse magnetic field.

12. The descaling and corrosion prevention device according to claim 11, characterized in that: The discharge time of the thyristor is 0.2s, and the maximum discharge current is 5kA.

13. A shell and tube heat exchanger, characterized in that: The invention comprises a main body and a descaling and anti-corrosion device, wherein the descaling and anti-corrosion device is the descaling and anti-corrosion device according to any one of claims 1 to 12.

14. An air conditioner, characterized in that: Including the shell and tube heat exchanger according to claim 13.

15. A water heater, characterized in that: Including the shell and tube heat exchanger according to claim 13.

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