Scale inhibition electromagnetic device, control method thereof and heat exchange equipment

Abstract

The invention discloses a scale inhibition electromagnetic device, a control method thereof and heat exchange equipment, and relates to the technical field of pipeline descaling. The scale inhibition electromagnetic device comprises: a water tank having a water inlet and a water outlet; the parts, located on the inner side and the outer side of the pipe body, in the water tank are communicated, a coil is arranged on the pipe body and connected to a power source in series to form a scale inhibition circuit, and a switch for controlling the scale inhibition circuit to be on and off is arranged on the scale inhibition circuit. According to the scale inhibition electromagnetic device, the coil on the pipe body is immersed in water in the water tank, a magnetic field is generated after the coil is conducted, water solutions in all positions in the water tank are subjected to the action of an electromagnetic field, a variable-frequency resonance field is generated, and scale removal and inhibition are achieved; as the magnetic fields can be formed on the inner side and the outer side of the pipe body connected with the coil, the magnetic fields on the inner side and the outer side of the pipe body can be applied to scale inhibition operation, the inner magnetic field and the outer magnetic field of the coil are utilized to the maximum extent, full application of the magnetic fields can be guaranteed, scale inhibition space can be enlarged, and scale inhibition efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline descaling, and in particular to a scale-inhibiting electromagnetic device and a control method thereof, and heat exchange equipment. Background Art

[0002] Scaling is very common in production and life. Pipes and heat exchange equipment in many industrial fields such as energy, chemical industry, and petroleum are affected by scale problems to varying degrees. As the system runs longer, scale will gradually precipitate and accumulate on the container wall and pipes of the heat exchanger, which will increase the heat transfer resistance of the heat exchanger, thereby affecting the heat transfer efficiency of the heat exchange equipment and causing energy waste.

[0003] One of the current descaling methods is to use physical methods to prevent scale, that is, to apply the functions of physical instruments and equipment to inhibit the formation of scale. Among them, electromagnetic descaling and scale inhibition is the most commonly used physical anti-scaling method.

[0004] In the process of realizing the present invention, the inventors found that the prior art has at least the following problems: in a current anti-scaling electromagnetic device, the coil is sleeved on the outside of the pipe body, and water is passed through the pipe body to prevent and remove scale. Due to the limitation of the water holding space, the anti-scaling efficiency is low.

[0005] Therefore, how to improve the scale inhibition efficiency is a technical problem that technicians in this field currently need to solve. Summary of the invention

[0006] In view of this, an object of the present invention is to provide a scale inhibition electromagnetic device and a control method thereof, and a heat exchange device, which can improve the scale inhibition efficiency.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A scale-inhibiting electromagnetic device comprises: a water tank having a water inlet and a water outlet; a pipe body arranged in the water tank, the parts of the water tank located on the inner and outer sides of the pipe body being connected, a coil is arranged on the pipe body, the coil is connected in series to a power supply to form a scale-inhibiting circuit, and a switch for controlling the on-off of the scale-inhibiting circuit is arranged on the scale-inhibiting circuit.

[0009] Preferably, the tube body comprises an inner tube and an outer tube sleeved outside the inner tube, a sandwich is formed between the inner tube and the outer tube, and the sandwich is sealed at both ends in the axial direction, and the coil is located in the sandwich.

[0010] Preferably, the tube body is placed in the water tank in a vertical direction, and the wires in the anti-scaling circuit for electrically connecting the coil to the power supply are led out through the top of the tube body.

[0011] Preferably, the tube body comprises an annular top cover, the top end of the interlayer is sealed by the top cover, and the top end of the inner tube and the top end of the outer tube extend into the top cover.

[0012] Preferably, the water inlet of the water tank is arranged at the lower end of the water tank, and the water inlet is radially located inside the inner cylinder, and the water outlet of the water tank is arranged on the side of the water tank.

[0013] Preferably, there are a plurality of coils, each coil forms a separate anti-scaling circuit with the power supply, and the switch is disposed on each anti-scaling circuit.

[0014] Preferably, the coils are arranged on the tube body in sequence from bottom to top.

[0015] Preferably, it also includes a controller and a flow rate sensor arranged in the water tank, which are used to detect the water flow rate in the water tank; the controller is used to control the opening and closing of the switch according to the water flow rate detected by the flow rate sensor.

[0016] A control method for a scale-inhibiting electromagnetic device is applied to the above scale-inhibiting electromagnetic device; the control method comprises: detecting the water flow velocity in the water tank; and determining the on-off of the switch according to the water flow velocity.

[0017] A heat exchange device comprises the above scale-inhibiting electromagnetic device.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] The scale-inhibiting electromagnetic device provided by the present invention comprises: a water tank having a water inlet and a water outlet; a pipe body arranged in the water tank, the inner and outer parts of the pipe body in the water tank being connected, a coil is arranged on the pipe body, the coil is connected in series to a power source to form a scale-inhibiting circuit, and a switch for controlling the on-off of the scale-inhibiting circuit is arranged on the scale-inhibiting circuit.

[0020] Compared with the prior art, the present invention has at least the following beneficial effects:

[0021] In this type of scale-inhibiting electromagnetic device, the coil on the pipe body is immersed in the water in the water tank. After the coil is turned on, a magnetic field is generated. The aqueous solution in various parts of the water tank is affected by the electromagnetic field, which produces a variable frequency resonance field, so that the active oxygen in the aqueous solution is activated in large quantities, which has the function of sterilization and inhibiting bacteria and algae, thereby achieving scale removal and scale inhibition. Moreover, since magnetic fields can be formed on both the inside and outside of the pipe body connected to the coil, the magnetic fields on both the inside and outside of the pipe body can be used in scale-inhibiting operations, making maximum use of the magnetic fields inside and outside the coil, which can ensure the full application of the magnetic field and expand the scale-inhibiting space, thereby improving the scale-inhibiting efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0023] Figure 1 It is a structural schematic diagram of a specific embodiment of the scale-inhibiting electromagnetic device provided by the present invention.

[0024] Reference numerals:

[0025] Controller 1;

[0026] Switch 2;

[0027] Coil 3;

[0028] Power supply 4;

[0029] tube body 5;

[0030] Flow rate sensor 6;

[0031] Water tank 7. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] The core of the present invention is to provide a scale inhibition electromagnetic device and a control method thereof, and a heat exchange device, which can improve the scale inhibition efficiency.

[0034] The specific embodiment 1 of the anti-scaling electromagnetic device provided by the present invention is applied to heat exchange equipment, please refer to Figure 1 , including a water tank 7, a tube body 5, a coil 3, a switch 2 and a power supply 4.

[0035] The water tank 7 has a water inlet and a water outlet. Water can enter the water tank 7 through the water inlet, and the water after scale prevention and descaling can be discharged from the water outlet 7. The water tank can specifically adopt a traditional large-volume circulating water tank. The water in the water tank 7 can specifically circulate, for example, by adding a circulating pump to drive the water to circulate to prevent scale. The water tank 7 can be a fully enclosed structure or a semi-enclosed structure with an opening.

[0036] The tube body 5 is disposed in the water tank 7, and the inner and outer parts of the tube body 5 in the water tank 7 are connected, and the inner and outer parts of the tube body 5 refer to the parts between the inner side of the inner peripheral surface and the outer side of the outer peripheral surface. Specifically, the tube body 5 is a straight tube, more specifically a round tube, and the tube body 5 extends in the axial direction, and the tube body 5 is an axially through-channel structure; in other embodiments, the tube body 5 may also be open at only one end in the axial direction, or the tube body 5 may be an arc tube or a tube body of other shapes.

[0037] A coil 3 is provided on the tube body 5, and the coil 3 is connected in series to the power supply 4 to form a scale prevention circuit, and a switch 2 for controlling the on and off of the scale prevention circuit is provided on the scale prevention circuit. When multiple coils 3 are provided, the coils 3 and the switches 2 are provided in equal quantities and one-to-one correspondence, and are respectively located in different scale prevention circuits.

[0038] The power supply 4 is an AC power supply, specifically, 220V AC power. In each scale prevention circuit, the AC power supply, the switch 2 and the corresponding coil 3 are connected in series. When the switch 2 is closed, the corresponding scale prevention circuit forms a loop, the coil 3 is turned on, and the AC power supply provides AC power to the corresponding coil 3, so that the coil 3 generates an alternating magnetic field. The switch 2 can be driven by a small level of a digital signal and can also carry an excitation signal.

[0039] In this kind of scale-inhibiting electromagnetic device, the coil 3 on the tube body 5 is immersed in the water of the water tank 7. After the coil 3 is turned on, a magnetic field is generated. The aqueous solution in various places in the water tank 7 is affected by the electromagnetic field, and a variable frequency resonance field is generated, so that the active oxygen in the aqueous solution is activated in large quantities, which has the functions of sterilization, inhibition of bacteria and algae, and achieves scale removal and scale inhibition. Moreover, since magnetic fields can be formed on both the inner and outer sides of the tube body 5 connected to the coil 3, the magnetic fields on both the inner and outer sides of the tube body 5 can be used in scale-inhibiting operations, which maximizes the use of the magnetic fields inside and outside the coil 3, can ensure the full application of the magnetic field and expand the scale-inhibiting space, thereby improving the scale-inhibiting efficiency.

[0040] Furthermore, the tube body 5 includes an inner tube and an outer tube sleeved outside the inner tube, a sandwich is formed between the inner tube and the outer tube, and the sandwich is sealed at both ends in the axial direction to form a sealed waterproof cavity, and the coil 3 is located in the sandwich, that is, in the waterproof cavity. Specifically, the coil 3 is tightly wound on the inner tube. After the coil 3 and the tube body 5 are assembled, the coil 3 is waterproofed, which can ensure the safety of the equipment operation. Of course, in other embodiments, the coil 3 can also be waterproofed by providing a waterproof coating.

[0041] Furthermore, if Figure 1As shown, the axial direction of the tube body 5 is vertically placed in the water tank 7, and the wires used to electrically connect the coil 3 to the power supply 4 in the scale prevention circuit are led out through the top of the tube body 5. The bottom end of the tube body 5 can be arranged in contact with the bottom wall of the water tank 7. At the same time, the power supply 4 and the switch 2 are placed outside the water tank 7, which is waterproof and convenient for equipment maintenance. In other embodiments, the power supply 4 and the switch 2 can be placed in a waterproof box and then built into the water tank 7.

[0042] Based on the placement direction of the tube body 5, it is convenient to lead out the wires, reduce the impact of water in the water tank 7 on the wires, and improve the safety of equipment operation. At the outlet of the wires from the tube body 5, the wires and the outlet are kept sealed, specifically by a sealing ring or a sealant.

[0043] Furthermore, the tube body 5 includes an annular top cover, the top of the interlayer is sealed by the top cover, and the top of the inner tube and the top of the outer tube extend into the top cover, which is convenient for the installation of the wires. Specifically, after the wires and the top cover are assembled, the top cover can be closed on the interlayer between the inner tube and the outer tube.

[0044] Among them, the top cover can be made of hard materials, which can not only play a sealing role but also a supporting role.

[0045] In addition, the other end between the inner tube and the outer tube in the axial direction, that is, the bottom end of the interlayer in this embodiment, can be sealed by an annular sealing layer, which can be made of the same material as the inner tube and the outer tube. During processing, the inner tube, the sealing layer and the outer tube can be formed as one piece, or the three can be fixedly connected by bonding or the like.

[0046] In addition, the material of the tube body 5 should be a material with stable chemical properties, which will not chemically react with the medium in the water tank 7 and has temperature resistance, for example, the temperature resistance is not less than 100°C; at the same time, the tube body 5 is made of a material through which the magnetic field can pass, and the magnetic field generated by the coil 3 in the tube body 5 can reach the inner side of the inner circumference of the tube body 5 and the outer side of the outer circumference, and specifically can cover the entire space in the water tank 7.

[0047] Furthermore, the water inlet of the water tank 7 is arranged at the lower end of the water tank 7 , and the water inlet is located on the inner side of the inner cylinder in the radial direction, and the water outlet of the water tank 7 is arranged on the side of the water tank 7 .

[0048] At this time, after the water enters the water tank 7, since the inner cylinder is an axially through-hole structure, the water can first enter the inner side of the inner cylinder from the bottom, and then move from the top of the tube body 5 to the space outside the outer cylinder in the water tank 7, and then flow out of the water outlet of the water tank 7, ensuring the fluidity of the water in the space inside the inner cylinder, so that the water in this part of the space that has been treated with anti-scaling can flow out of the water tank 7 smoothly.

[0049] Of course, in other embodiments, a fluid through hole may be further provided on the tube body 5, and the two ends of the hole wall are respectively sealed to connect the inner tube and the outer tube, thereby increasing the smoothness of the fluid flow inside and outside the tube body 5 and avoiding affecting the sealing of the interlayer.

[0050] Furthermore, there are multiple coils 3, each coil 3 forms a separate scale prevention circuit with the power supply 4, and each scale prevention circuit is provided with a switch 2. Each coil 3 can be turned on according to actual needs, which can improve the flexibility of scale prevention.

[0051] For the convenience of assembly or based on the requirement of forming an alternating magnetic field, the coils 3 are arranged on the tube body 5 from bottom to top, and it is convenient to number the coils 3 and control the conduction of the coils 3 in sequence.

[0052] In addition, each coil 3 is tightly wound around the outside of the inner tube, and the number of coils 3 is positively correlated with the axial length of the tube body 5. The longer the tube, the more the number of coils 3 will increase, and the shorter the tube, the less the number of coils 3 will decrease.

[0053] Each coil 3 may cover the entire outer circumference of the inner cylinder along the axial direction. Specifically, the number of coils 3 may be selected according to the axial length of the inner cylinder and the width of the coil 3. Each coil 3 is sequentially wound around the outer circumference of the inner cylinder along the axial direction. In this embodiment, the number of coils 3 may be 3. In other embodiments, the number of coils 3 may be 1, 4 or other numbers according to the axial length of the inner cylinder and the length of the coil 3.

[0054] Furthermore, the anti-scaling electromagnetic device also includes a controller 1 and a flow rate sensor 6 disposed in the water tank 7, which is used to detect the water flow rate in the water tank 7. The controller 1 is electrically connected to the switch 2 and the flow rate sensor 6, and the flow rate sensor 6 serves as the input end of the controller 1. The controller 1 is used to control the opening and closing of the switch 2 according to the water flow rate detected by the flow rate sensor 6, including the opening and closing time and duration, so as to adjust the corresponding conduction condition and duration of the coil 3. The controller 1 is specifically a control chip. Among them, the flow rate sensor 6 is arranged at a preset position in the water tank 7, and can be specifically located on the inner side or the outer side of the tube body 5.

[0055] At this time, the flow rate sensor 6 is used to detect the water flow rate in the water tank 7, and each switch 2 is used to control the conduction and shutdown of the corresponding coil 3; the controller 1 calculates the total conduction time of the coil 3 according to the water flow rate signal of the flow rate sensor 6, and controls multiple switches 2 to be closed periodically and alternately in a preset order according to the total conduction time, so that the coil 3 generates an alternating magnetic field when the corresponding switch 2 is closed.

[0056] The signal measured by the flow rate sensor 6 controls the switch 2 to determine whether the coil 3 is turned on and the duration of the conduction. The control is simple, the power-on mode of the coil 3 is changed, and the internal and external magnetic fields of the coil 3 are utilized to the maximum extent, thereby improving the scale prevention efficiency. In addition, the investment cost is low, the operating efficiency is high, the installation is simple, and the maintenance is convenient.

[0057] The scale inhibition process of the scale inhibition electromagnetic device in this embodiment includes:

[0058] The controller 1 controls the coil 3 to be energized. When the coil 3 is turned on, an alternating electromagnetic field is generated on both sides of the inner and outer sides of the pipe body 5 in the water tank 7. The alternating electromagnetic field resonates with the water molecules. As a result of the resonance, the hydrogen bonds are broken, and the water molecule clusters are turned into single polar water molecules, thereby improving the activation of water and the solubility of scale. The extremely small water molecules can penetrate, surround, loosen, dissolve, and remove the old scale in the pipeline. At the same time, the calcium ions and carbonate ions floating in the water collide with each other to form a special aragonite calcium carbonate body, which has no charge on the surface, so it can no longer be adsorbed on the pipe body 5 and the water tank 7, thereby achieving the purpose of descaling and anti-scaling; the water solution in the water tank 7 and the circulation pipeline is affected by the electromagnetic field, and a variable frequency resonance field is generated, which makes the active oxygen in the water solution activated in large quantities, and also has the functions of sterilization, inhibition of bacteria, and algae removal.

[0059] In addition to the above-mentioned anti-scaling electromagnetic device, the present invention also provides a control method for the anti-scaling electromagnetic device, which can specifically control the anti-scaling electromagnetic device in the above-mentioned embodiment. The control method can be executed by the controller 1 in the anti-scaling electromagnetic device.

[0060] The control method includes:

[0061] S1: Detect the water flow velocity in the water tank 7.

[0062] The water flow velocity is detected by a flow velocity sensor 6 in the water tank 7 .

[0063] S2: Determine the on / off status of switch 2 according to the water flow rate.

[0064] Specifically, if there are multiple coils 3, then in S2, the on / off of the switch 2 is determined according to the water flow speed, which specifically includes:

[0065] S21: According to the water flow speed, each coil 3 is controlled to be turned on in sequence according to a preset sequence, wherein one coil 3 is turned on each time.

[0066] Three coils are provided, which are the first coil, the second coil and the third coil from bottom to top.

[0067] In the process of controlling each coil 3 to be turned on in sequence according to a preset order, the preset order can be calibrated according to actual conditions. For example, it can be sorted from top to bottom, or from bottom to top, or not in the top-to-bottom order. The preset order only needs to be free of repetition.

[0068] Specifically, to facilitate determination of the conduction sequence of the coils 3, there are N coils 3, N is a positive integer greater than 1, and each coil 3 is numbered from 1 to N in a preset sequence, and is respectively the i-th coil, wherein i is a positive integer, and 1≤i≤N, and i takes a value between 1 and N. In addition, the switch 2 is numbered the same as the coil 3 in the same scale prevention circuit, that is, the i-th coil is controlled by the i-th switch and the value of i is the same.

[0069] Specifically, each coil 3 can be turned on periodically in the order of numbering. When controlling the on and off of the coil 3, a value from 1 to N can be taken, and the corresponding coils 3 are controlled to be turned on in sequence in the order of numbering, and only one coil 3 is turned on each time. Among them, the number of coils 3 turned on can be determined according to the calculated total on time. When all coils 3 are turned on once and the total on time is still not reached, they can be turned on again starting from the first coil in a cycle.

[0070] Specifically, the conduction time of each single coil 3 may be the same, and the conduction intervals of adjacent coils 3 may be the same, or the conduction time and intervals may be equal. In the intervals, each coil 3 is in a disconnected state.

[0071] Specifically, according to actual needs, the numbering of each coil 3 can be adjusted each time it is used. Specifically, the numbering can be performed before each startup, the numbering can be cleared when shutting down, and the numbering can be re-performed when it is used next time.

[0072] Specifically, the total conduction time of the coil 3 is calculated by the following formula:

[0073]

[0074] Wherein, T represents the conduction time of coil 3, n represents the total number of segments of coil 3, L represents the sum of the widths of n coils 3, and the unit is m; V represents the water flow velocity, and the unit is m / s.

[0075] The control method in this embodiment calculates the total conduction time of the coil according to the water flow velocity, and controls multiple switches to be closed alternately and periodically in a preset order according to the total conduction time, so that the coil 3 generates an alternating magnetic field when the corresponding switch 2 is closed, and the scale prevention effect is good; the signal measured by the flow rate sensor controls the switch 2 to determine whether the coil 3 is turned on and the conduction time, the control is simple, the power-on mode of the coil 3 is changed, and the scale removal efficiency is improved; the investment cost is low, the operating efficiency is high, the installation is simple, and the maintenance is convenient; the physical method is used to prevent and remove scale, which can effectively avoid the corrosion of chemical agents on the equipment, extend the service life of the equipment, reduce the intangible loss of fixed assets, and also protect the ecological environment.

[0076] In addition, the present invention also provides a heat exchange equipment using the above-mentioned anti-scaling electromagnetic device and its control method, which can ensure the descaling efficiency.

[0077] It should be noted that when an element is referred to as "fixed" to another element, it may be directly on the other element or there may be an element in the middle. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an element in the middle. In addition, in the description of the present invention, unless otherwise specified, "multiple", "multiple roots", "multiple groups" mean two or more.

[0078] The terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0079] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0080] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0081] The anti-scaling electromagnetic device and its control method and heat exchange equipment provided by the present invention are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A scale-inhibiting electromagnetic device, characterized in that: include: A water tank (7), wherein the water tank (7) has a water inlet and a water outlet; A tube body (5) is arranged in the water tank (7), the inner and outer parts of the tube body (5) in the water tank (7) are connected, a coil (3) is arranged on the tube body (5), the coil (3) is connected in series to a power source (4) to form a scale prevention circuit, and a switch (2) for controlling the on / off of the scale prevention circuit is arranged on the scale prevention circuit.

2. The anti-scaling electromagnetic device according to claim 1, characterized in that: The tube body (5) comprises an inner tube and an outer tube sleeved outside the inner tube, a sandwich is formed between the inner tube and the outer tube, and both ends of the sandwich are sealed in the axial direction, and the coil (3) is located in the sandwich.

3. The anti-scaling electromagnetic device according to claim 2, characterized in that: The tube body (5) is placed in the water tank (7) with its axis in a vertical direction, and the wires in the anti-scaling circuit for electrically connecting the coil (3) to the power source (4) are led out through the top of the tube body (5).

4. The anti-scaling electromagnetic device according to claim 3, characterized in that: The tube body (5) comprises an annular top cover, the top end of the interlayer is sealed by the top cover, and the top end of the inner tube and the top end of the outer tube extend into the top cover.

5. The anti-scaling electromagnetic device according to claim 3, characterized in that: The water inlet of the water tank (7) is arranged at the lower end of the water tank (7), and the water inlet is radially located inside the inner cylinder, and the water outlet of the water tank (7) is arranged on the side of the water tank (7).

6. The anti-scaling electromagnetic device according to claim 3, characterized in that: There are a plurality of coils (3), each of which forms a separate scale prevention circuit with the power supply (4), and each of which is provided with the switch (2).

7. The anti-scaling electromagnetic device according to claim 6, characterized in that: The coils (3) are arranged on the tube body (5) in sequence from bottom to top.

8. The anti-scaling electromagnetic device according to claim 7, characterized in that: It also comprises a controller (1) and a flow rate sensor (6) disposed in the water tank (7) for detecting the water flow rate in the water tank (7); the controller (1) is used to control the opening and closing of the switch (2) according to the water flow rate detected by the flow rate sensor (6).

9. A control method for a scale inhibition electromagnetic device, characterized in that: The anti-scaling electromagnetic device as claimed in any one of claims 1 to 8; The control method comprises: detecting the water flow velocity in the water tank (7); The on / off state of the switch (2) is determined according to the water flow speed.

10. A heat exchange device, characterized in that: The invention comprises the anti-scaling electromagnetic device according to any one of claims 1 to 8.

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