High-frequency cleaning equipment for heat exchanger

Abstract

The utility model provides high-frequency cleaning equipment for a heat exchanger, which comprises a liquid storage tank, a water return pipeline high-frequency generation module and a five-way valve, and the water return pipeline high-frequency generation module comprises a first high-frequency generator and a first high-frequency intensity adjusting mechanism; a liquid outlet of the liquid storage tank is communicated with a liquid inlet of the five-way valve, a liquid return port of the five-way valve is connected with a liquid inlet of the first high-frequency generator, and a liquid outlet of the first high-frequency generator is communicated with a liquid return port of the liquid storage tank; and the first high-frequency intensity adjusting mechanism is arranged in the first high-frequency generator. The water return pipeline high-frequency generation module is arranged on the water return pipeline, so that target cleaning equipment is located between the water return pipeline high-frequency generation module and the variable-frequency cleaning pump, the variable-frequency cleaning pump provides circulating cleaning power, and cleaning media form high-frequency vibration waves through the first high-frequency generator in the cleaning process; and the high-frequency vibration waves are reversely propagated in the cleaning medium to form impact force in the heat exchanger, so that impurities, dirt and other impurities in the heat exchanger are stripped off, and a better cleaning effect is achieved.

Description

Technical Field

[0001] The utility model relates to the field of high-frequency cleaning, in particular to a high-frequency cleaning device for heat exchangers. Background Technique

[0002] Plate heat exchangers and shell-and-tube heat exchangers are common heat exchange devices that conduct heat exchange through the liquid flow between plates or between the tube side and the shell side. When power plant equipment conducts heat exchange, a large number of shell-and-tube heat exchangers are used. After long-term operation, they are prone to fouling, etc., and the heat exchangers need to be cleaned. In reality, gas-water pulse or high-pressure water flushing is generally used. Gas-water pulse cleaning is to forcefully increase the medium disturbance in the heat exchanger by mixing compressed air and water, so as to achieve the purpose of cleaning. In this way, due to the entry of a large amount of gas into the heat exchange equipment, it is easy to cause deformation of the plates of the plate heat exchanger or damage to the sealing strips. High-pressure water cleaning requires the heat exchanger to be disassembled for cleaning, which is cumbersome and pollutes the environment, and cannot achieve the purpose of online cleaning.

[0003] At present, high-frequency oscillation cleaning equipment is also used for cleaning. High-frequency oscillation cleaning is to make the cleaning medium conduct high-frequency oscillation energy through a high-frequency generator, and forcefully increase the micro disturbance of the medium in the heat exchanger, so as to achieve the purpose of uniform medium disturbance and complete stripping of dirt. However, the high-frequency generating units of existing high-frequency cleaning devices for heat exchangers are all arranged on the water inlet pipe, that is, between the liquid outlet of the liquid storage tank and the target cleaning device, and perform high-frequency oscillation disturbance on the cleaning liquid entering the target cleaning device. This method can achieve a certain cleaning effect, but the cleaning effect still cannot meet the requirements.

[0004] Therefore, the utility model proposes a high-frequency cleaning device for heat exchangers, in which the high-frequency generating module is arranged on the return water pipeline, achieving a better cleaning effect; especially when high-frequency generating modules are arranged on both the water inlet pipeline and the return water pipeline, the cleaning effect is the best. Content of the Utility Model

[0005] In order to solve the problems existing in the background technique, the utility model proposes a high-frequency cleaning device for heat exchangers.

[0006] A high-frequency cleaning device for heat exchangers includes a liquid storage tank, a high-frequency generating module for the return water pipeline, and a five-way valve. The high-frequency generating module for the return water pipeline includes a first high-frequency generator and a first high-frequency intensity adjusting mechanism; the liquid outlet of the liquid storage tank is communicated with the liquid inlet of the five-way valve, the return liquid port of the five-way valve is connected to the liquid inlet of the first high-frequency generator, and the liquid outlet of the first high-frequency generator is communicated with the return liquid port of the liquid storage tank; the first high-frequency intensity adjusting mechanism is arranged in the first high-frequency generator and is used to adjust the high-frequency intensity.

[0007] Based on the above, a mobile frame, a liquid storage tank, a high-frequency generating module for the return water pipeline, and a five-way valve are respectively arranged on the mobile frame; a control cabinet is also arranged on the mobile frame, and a human-machine interaction panel, a controller, and a power module are arranged in the control cabinet. The power module is used to provide voltage, and the controller is controlled and connected to the human-machine interaction panel and the high-frequency generating module for the return water pipeline.

[0008] Based on the above, the five-way valve includes a valve control motor and a valve body. The valve control motor is used to control the port switching of the valve body, and the controller is controlled and connected to the valve control motor; the ports of the valve body respectively include a liquid inlet, a liquid return port, a forward cleaning port, a reverse cleaning port, and a sewage discharge port, and connecting flanges are respectively arranged at the ports of the valve body; the forward cleaning port and the reverse cleaning port are respectively used to communicate with the liquid storage tank and the target cleaning equipment, and the sewage discharge port is used to communicate with the liquid storage tank and the external sewage tank.

[0009] Based on the above, a variable-frequency cleaning pump is arranged on the mobile frame. The variable-frequency cleaning pump is respectively communicated with the liquid outlet of the liquid storage tank and the liquid inlet of the five-way valve; the controller is controlled and connected to the variable-frequency cleaning pump.

[0010] Based on the above, a mixing tank is arranged on the mobile frame. A solenoid valve is arranged corresponding to the mixing tank at the liquid outlet of the liquid storage tank, and the liquid outlet end of the mixing tank is communicated with the liquid outlet end of the solenoid valve; a feeding port is arranged at the top of the mixing tank, and the controller is controlled and connected to the mixing tank and the solenoid valve.

[0011] Based on the above, at least one set of steering wheels is arranged at the bottom of the mobile frame, and the controller is controlled and connected to the steering wheels; a water injection port, an overflow port, and a deflation port are arranged on the liquid storage tank. The water injection port is used to communicate with an external water source, the overflow port is used to communicate with an external overflow tank, and the deflation port is used to communicate with external air.

[0012] Based on the above, a high-frequency generating module for the water inlet pipeline is included. The high-frequency generating module for the water inlet pipeline includes a second high-frequency generator and a second high-frequency intensity adjusting mechanism. The liquid outlet of the variable-frequency cleaning pump is communicated with the liquid inlet of the second high-frequency generator, and the liquid outlet of the second high-frequency generator is communicated with the liquid inlet of the five-way valve; the second high-frequency intensity adjusting mechanism is arranged in the second high-frequency generator and is used to adjust the high-frequency intensity; the controller is controlled and connected to the high-frequency generating module for the water inlet pipeline.

[0013] Based on the above, the first high-frequency generator and the first high-frequency intensity adjusting mechanism of the high-frequency generating module for the return water pipeline are integrally arranged; the second high-frequency generator and the second high-frequency intensity adjusting mechanism of the high-frequency generating module for the water inlet pipeline are integrally arranged.

[0014] Based on the above, the first high-frequency generator and the second high-frequency generator respectively include a pneumatic high-frequency valve, an air pump, and a solenoid valve. A valve rod and a flow channel are arranged inside the pneumatic high-frequency valve. A valve plate for opening and closing the flow channel is arranged at the end of the valve rod corresponding to the middle of the flow channel; the high-frequency generating mechanism inside the pneumatic high-frequency valve includes a piston chamber, a piston, and a first spring. The piston is arranged in the middle of the valve rod and is movably arranged inside the piston chamber. The first spring is arranged between the piston and the top wall inside the piston chamber. An air chamber is formed between the bottom of the piston and the bottom of the piston chamber. An air inlet and an air outlet are respectively arranged on the chamber wall of the piston chamber corresponding to the air chamber; the controller is respectively connected to the air pump and the solenoid valve in a controlled manner. The solenoid valve itself has an air intake passage and an air exhaust passage. The air pump is respectively connected to the air source and the air intake port of the air intake passage of the solenoid valve. The air inlet of the air chamber is connected to the air exhaust port of the air intake passage of the solenoid valve, the air outlet of the air chamber is connected to the air intake port of the air exhaust passage of the solenoid valve, and the air exhaust port of the air exhaust passage of the solenoid valve is used to communicate with the outside.

[0015] Based on the above, the first high-frequency intensity adjustment mechanism and the second high-frequency intensity adjustment mechanism respectively include a servo motor, a first bevel gear, a second bevel gear, and an intensity adjustment member. The rotating shaft of the servo motor is horizontally arranged and is drivingly connected to the first bevel gear. The second bevel gear is rotatably arranged at the outer top of the piston chamber. The first bevel gear is meshed and connected to the second bevel gear; a gear through hole is arranged in the middle of the second bevel gear. A keyway is vertically arranged on the hole side wall of the gear through hole. A limit key is arranged on the side wall of the valve rod along the axis corresponding to the keyway. The valve rod is movably arranged inside the gear through hole; the intensity adjustment member includes a first adjustment hole and a second adjustment hole. A plurality of first adjustment holes are evenly distributed on the valve plate. A plurality of second adjustment holes are respectively arranged in the flow channel corresponding to the first adjustment holes; the controller is connected to the servo motor in a controlled manner.

[0016] The utility model has substantial features and progress compared with the prior art. Specifically, the high-frequency generating module of the return water pipeline is arranged on the return water pipeline, that is, between the liquid return port of the five-way valve and the liquid return port of the liquid storage tank, so that the target cleaning equipment is located between the high-frequency generating module of the return water pipeline and the variable-frequency cleaning pump. The variable-frequency cleaning pump provides the power for circulating cleaning. During the cleaning process, the first high-frequency generator makes the cleaning medium form high-frequency vibration waves. These high-frequency vibration waves propagate in the reverse direction in the cleaning medium and form an impact force in the heat exchanger, thereby stripping impurities, dirt and other sundries in the heat exchanger and achieving a better cleaning effect. At the same time, the frequency of the variable-frequency cleaning pump and the opening degree of the first high-frequency intensity adjusting mechanism can be controlled to make the high-frequency intensity suitable for heat exchangers of different areas. In the existing high-frequency cleaning equipment for heat exchangers, the high-frequency intensity is between 0 - 3 bar, and the pressure difference drops to about 215 KPa after cleaning; while in the utility model, when only the high-frequency generating module is arranged on the return water pipeline, the high-frequency intensity can reach between 0 - 5 bar, and the pressure difference drops to about 180 KPa after cleaning; when high-frequency generating modules are arranged on both the inlet and return water pipelines, the high-frequency intensity can reach between 0 - 6 bar, and the pressure difference drops to about 100 KPa after cleaning, and the effect improvement is obvious. Brief Description of the Drawings

[0017] Figure 1 is the schematic side view structure diagram of the utility model.

[0018] Figure 2 is the schematic top view structure diagram of the utility model (the valve control motor is not shown).

[0019] Figure 3 is the schematic sectional view structure diagram of the utility model when the valve plate of the high-frequency generating module is in the closed state.

[0020] Figure 4 is the high-frequency intensity test curve graph when only the high-frequency generating module of the return water pipeline of the utility model functions.

[0021] Figure 5 is the high-frequency intensity test curve graph when the high-frequency generating modules of the return water pipeline and the inlet water pipeline of the utility model function simultaneously.

[0022] Figure 6 is the high-frequency intensity test curve graph when only the high-frequency generating module is arranged on the inlet water pipeline in the prior art of the utility model.

[0023] Figure 7 is the pressure difference test curve graph when only the high-frequency generating module of the return water pipeline of the utility model functions.

[0024] Figure 8 is the pressure difference test curve graph when the high-frequency generating modules of the return water pipeline and the inlet water pipeline of the utility model function simultaneously.

[0025] Figure 9 It is a differential pressure test curve graph when only the water inlet pipeline is provided with a high-frequency generation module in the prior art of the present utility model.

[0026] Figure 10 It is a schematic cross-sectional structure diagram of the present utility model in a state where the valve plate of the high-frequency generation module is opened to a certain extent.

[0027] Figure 11 It is a schematic structural diagram of the present utility model in a state where the first adjustment hole and the second adjustment hole are aligned.

[0028] Figure 12 It is a schematic structural diagram of the present utility model in a state where the first adjustment hole and the second adjustment hole are misaligned after the valve plate rotates.

[0029] Figure 13 It is a schematic structural diagram of the valve rod and the limit key of the present utility model.

[0030] Explanation of reference numerals: 1. Moving vehicle frame; 2. Steering wheel; 3. Variable frequency cleaning pump; 4. Overflow port; 5. Water injection port; 6. Air release port; 7. Liquid storage tank; 8. High-frequency generation module of the return water pipeline; 9. Stirring tank; 10. Return liquid port of the five-way valve; 11. Valve control motor; 12. Five-way valve; 13. Control cabinet; 14. Drain port; 15. Forward cleaning port; 16. Liquid inlet of the five-way valve; 17. Reverse cleaning port; 18. Liquid outlet of the liquid storage tank; 101. Pneumatic high-frequency valve; 102. Liquid outlet; 103. Valve plate; 104. Sealing rubber ring; 105. Second spring; 106. Sealing rubber ring of the sealing cavity; 107. Piston sealing rubber ring; 108. Limit protrusion; 109. Servo motor; 110. First bevel gear; 111. Second bevel gear; 112. First spring; 113. Piston; 114. Valve rod; 115. First adjustment hole; 116. Second adjustment hole; 117. Liquid inlet; 118. Air inlet; 119. Exhaust port; 120. Limit key; 121. Limit column; 122. Extrusion ring. Specific embodiments

[0031] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0032] Embodiment 1

[0033] As Figure 1 - Figure 2As shown in the figure, a high-frequency cleaning device for a heat exchanger includes a liquid storage tank 7, a high-frequency generating module 8 for the return water pipeline, and a five-way valve 12. The liquid storage tank 7 is used to store cleaning liquids such as water. The high-frequency generating module 8 for the return water pipeline (shown as a box in the figure, with a first high-frequency generator and a first high-frequency intensity adjusting mechanism arranged inside) includes a first high-frequency generator and a first high-frequency intensity adjusting mechanism. The first high-frequency generator is used to form high-frequency vibration waves for the cleaning medium, and the first high-frequency intensity adjusting mechanism is arranged inside the first high-frequency generator. By adjusting the opening degree of the first high-frequency intensity adjusting mechanism, the high-frequency intensity is adjusted, that is, the high-frequency intensity of cleaning the heat exchanger is adjusted. The liquid outlet 18 of the liquid storage tank 7 is connected to the liquid inlet 16 of the five-way valve. The return liquid port 10 of the five-way valve 12 is connected to the liquid inlet of the first high-frequency generator, and the liquid outlet of the first high-frequency generator is connected to the return liquid port of the liquid storage tank 7. That is, the high-frequency generating module 8 for the return water pipeline is arranged on the return water pipeline, so that the target cleaning device such as a heat exchanger is located between the high-frequency generating module 8 for the return water pipeline and the variable-frequency cleaning pump 3. The variable-frequency cleaning pump 3 provides the circulating cleaning power. During the cleaning process, the first high-frequency generator makes the cleaning medium form high-frequency vibration waves, and these high-frequency vibration waves propagate reversely in the cleaning medium, forming an impact force in the heat exchanger, thereby peeling off impurities, dirt and other sundries in the heat exchanger. Compared with the situation where the high-frequency generating module 8 for the return water pipeline is arranged between the cleaning pump and the heat exchanger, the high-frequency vibration waves are formed in the pipeline between the cleaning pump and the high-frequency generating module 8 for the return water pipeline, and the acting force on the heat exchanger is smaller. In this embodiment, the high-frequency generating module 8 for the return water pipeline is arranged on the return water pipeline, so that the heat exchanger is between the cleaning pump and the high-frequency generating module 8 for the return water pipeline, and the water hammer effect directly acts on the heat exchanger, and a better cleaning effect can be achieved.

[0034] In reality, after calculating the total volume V of water in the plate heat exchanger according to the nameplate of the plate heat exchanger and measuring the total height H of the plate heat exchanger, it can be calculated that the water volume per unit millimeter height in the plate heat exchanger is V1 = V / H. By controlling the pump flow Q of the variable-frequency cleaning pump, the time T required to inject the water volume per unit millimeter height into the plate heat exchanger is T = V1 / Q. By controlling the high-frequency time T, the generated high-frequency vibration acts on the position of the plate heat exchanger per unit millimeter height to achieve the purpose of cleaning. The cleaning effect can be reflected by the high-frequency intensity and pressure difference of the cleaning medium. The greater the high-frequency intensity and the smaller the pressure difference after cleaning, the better the cleaning effect. For example Figure 4 and Figure 6 are the high-frequency intensity test comparisons when the high-frequency generating module is on the return water pipeline and the water inlet pipeline respectively. Figure 7 and Figure 9The differential pressure test comparisons are respectively when the high-frequency generating module is on the return water pipeline and the water inlet pipeline. For the existing high-frequency cleaning equipment of heat exchangers, the high-frequency intensity is between 0 - 3 bar, and the differential pressure drops to about 215 KPa after cleaning; while in this embodiment, when the high-frequency generating module is only set on the return water pipeline, the high-frequency intensity can reach between 0 - 5 bar, and the differential pressure drops to about 180 KPa after cleaning, with obvious improvement in effect.

[0035] Specifically, in this embodiment, the first high-frequency generator and the first high-frequency intensity adjusting mechanism of the high-frequency generating module on the return water pipeline are integrally arranged. As Figure 3 , Figure 10 shown, the first high-frequency generator includes a pneumatic high-frequency valve 101, an air pump, and a solenoid valve. A valve rod 114 and a flow channel are arranged inside the pneumatic high-frequency valve 101. A valve plate 103 for opening and closing the flow channel is arranged at the end of the valve rod 114 corresponding to the middle of the flow channel. In reality, a liquid inlet 117 and a liquid outlet 102 are respectively arranged on the pneumatic high-frequency valve 101 corresponding to the flow channel, and are respectively connected to the cleaning pipeline through the liquid inlet 117 and the liquid outlet 102. The high-frequency generating mechanism inside the pneumatic high-frequency valve 101 includes a piston cavity, a piston 113, and a first spring 112. The piston 113 is arranged in the middle of the valve rod 114 and the piston 113 is movably arranged in the piston cavity. The first spring 112 is arranged between the piston 113 and the top wall inside the piston cavity; an air cavity is formed between the bottom of the piston 113 and the bottom of the piston cavity. An air inlet 118 and an air outlet 119 are respectively arranged on the cavity wall of the piston cavity corresponding to the air cavity. The controller is respectively connected to control the air pump and the solenoid valve. The solenoid valve itself has an air intake passage and an air exhaust passage. The air pump is respectively connected to the air source (the air source at the cleaning site (owned by the power plant) is used in reality) and the air intake port of the air intake passage of the solenoid valve. The air inlet 118 of the air cavity is connected to the air exhaust port of the air intake passage of the solenoid valve, the air outlet 119 of the air cavity is connected to the air intake port of the air exhaust passage of the solenoid valve, and the air exhaust port of the air exhaust passage of the solenoid valve is used to communicate with the outside. When the intake valve is opened and the exhaust valve is closed, after the air inlet 118 intakes air, under the action of air pressure, the valve rod 114 is pushed up by the piston 113. At this time, the first spring 112 is compressed, so that the valve plate 103 opens the flow channel; after the intake valve is closed and the exhaust valve is opened, under the elastic force of the first spring 112, the valve rod 114 and the valve plate 103 are quickly dropped by pushing the piston 113, and then the flow channel is closed by the valve plate 103. By controlling the intake and exhaust valves and the air pump, the valve plate 103 can be used to control the opening and closing of the flow channel at a high frequency (10 times / s). In reality, the specification of the first spring 112 is selected according to the specification of the pneumatic high-frequency valve. Different specifications of pneumatic high-frequency valves are used for different types of target cleaning equipment or corresponding cut-off water pressures, etc.

[0036] In reality, the strokes of the valve stem 114 and the valve plate 103 are set according to the size of the flow channel, etc. A limiting convex portion 108 corresponding to the piston 113 is provided on the inner side wall of the piston chamber to prevent the valve stem 114 and the valve plate 103 from having excessive strokes and causing collision and damage between the valve plate 103 and the side wall of the flow channel. Preferably, a sealing chamber is provided between the piston chamber and the flow channel. A sealing rubber ring 104 coaxial with the valve stem 114 is provided on the side wall of the sealing chamber. A second spring 105 is provided between the top of the sealing rubber ring 104 and the inner top wall of the sealing chamber. The valve stem 114 is inserted into the sealing rubber ring 104, and the sealing rubber ring 104 is arranged in a fitting manner with the valve stem 114. The second spring 105 is in a compressed state. Through the extrusion action of the second spring 105 on the sealing rubber ring 104, the sealing rubber ring 104 generates a certain deformation, so that the sealing rubber ring 104 seals the gap between the valve stem 114 and the flow channel to prevent the cleaning medium in the flow channel from leaking. Specifically, a plurality of limiting columns 121 are arranged in a circular array on the top wall of the sealing chamber. An extrusion ring 122 is placed on the top of the sealing rubber ring 104. A plurality of the second springs 105 are vertically arranged on the top of the extrusion ring. The second springs 105 are respectively sleeved outside the limiting columns 121. Thus, through a plurality of uniformly distributed second springs 105 and an extrusion ring 122, a balanced spring elastic extrusion force is applied to the sealing rubber ring 104, and further the sealing rubber ring 104 generates a certain deformation. The plurality of limiting columns 121 not only prevent the second spring 105 from bending and affecting the valve stem, but also cooperate with the plurality of second springs 105 to prevent the extrusion ring 122 from being misaligned relative to the valve stem and causing friction with the valve stem, etc. In practice, a communication hole is provided at the top of the sealing chamber. The valve stem 114 is inserted into the communication hole, the sealing chamber and the flow channel; a multi-stage sealing rubber ring 106 is provided on the side wall of the communication hole, which cooperates with the sealing rubber ring 104 to further form a multi-stage seal for the gaps between the valve stem 114 and the flow channel, and between the sealing chamber and the air chamber to ensure the sealing effect. In addition, a sealing rubber ring 107 is also provided on the side wall of the piston 113 to improve the sealing performance of the air chamber.

[0037] The first high-frequency intensity adjustment mechanism includes a servo motor 109, a first bevel gear 110, a second bevel gear 111 and an intensity adjustment member. The rotating shaft of the servo motor 109 is horizontally arranged and is drivingly connected to the first bevel gear 110. The second bevel gear 111 is rotatably arranged at the outer top of the piston chamber. The first bevel gear 110 is meshed and connected with the second bevel gear 111; a gear through hole is provided in the middle of the second bevel gear 111. A key groove is vertically provided on the hole side wall of the gear through hole. A limiting key 120 is axially arranged on the side wall of the valve stem 114 corresponding to the key groove as Figure 13As shown, the valve stem 114 is movably inserted through the gear through-hole. The servo motor 109 is fixed on the pneumatic high-frequency valve 101. The controller is connected to the servo motor in a controlled manner. The rotating shaft of the servo motor 109 is drivingly connected with a first bevel gear 110. The second bevel gear 111 is rotatably arranged at the top of the piston chamber and meshes with the first bevel gear 110. There is a through-hole at the top of the piston chamber, and its size is set corresponding to the size of the valve stem 114 and the limit key 120 thereon. A through-hole is correspondingly arranged in the middle of the second bevel gear 111. The valve stem 114 passes through the piston chamber and is inserted into the gear through-hole of the second bevel gear 111, and the limit key 120 on the valve stem 114 is located in the key groove. Therefore, when the second bevel gear 111 rotates, through the action of the key groove and the limit key 120, the valve stem 114 and the valve plate 103 are driven to rotate. In reality, the length of the limit key 120 is at least greater than the stroke of the valve stem 114, so that when the valve stem 114 moves up and down, the limit key 120 is always located in the key groove, avoiding circumferential misalignment of the valve stem 114, the valve plate 103, etc. when the valve stem 114 moves up and down. In this embodiment, as Figure 11 and Figure 12 shown, the intensity adjusting member includes a first adjusting hole 115 and a second adjusting hole 116. A plurality of first adjusting holes 115 are evenly distributed on the valve plate 103, and a plurality of second adjusting holes 116 are respectively arranged in the flow channel corresponding to the first adjusting holes 115. In this embodiment, the flow channel is approximately Z-shaped, and a plurality of second adjusting holes 116 are opened on the side wall in the middle of the flow channel. When the first adjusting hole 115 and the second adjusting hole 116 are completely aligned, when the valve plate 103 is closed, there is still some cleaning medium flowing out through the first adjusting hole 115 and the second adjusting hole 116, and the intensity is the smallest at this time; when the first adjusting hole 115 and the second adjusting hole 116 are completely misaligned, the cleaning medium is completely cut off when the valve plate 103 is closed, and the intensity is the largest at this time.

[0038] One end of the pneumatic high-frequency valve is communicated with the liquid outlet of the five-way valve 12, and the other end of the pneumatic high-frequency valve is communicated with the liquid return port of the liquid storage tank 7. By controlling the pneumatic high-frequency valve to quickly open and cut off the return water through the controller, an oscillating wave is formed in the pipeline system and the heat exchanger, so that the cleaning function of the heat exchanger can be realized. The flow rate of the first high-frequency intensity adjusting mechanism and the cleaning pump frequency conversion function adjusting system in the pneumatic high-frequency valve 101 is adjusted, so as to realize the adjustment of the high-frequency intensity.

[0039] The five-way valve 12 includes a valve control motor 11 and a valve body. The valve control motor 11 is a servo motor used to control the port switching of the valve body to change the pipeline connection relationship, and the controller is connected to control the valve control motor 11. The ports of the valve body respectively include a liquid inlet, a liquid return port, a forward cleaning port 15, a reverse cleaning port 17, and a sewage discharge port 14. Connecting flanges are respectively arranged at the ports of the valve body for connecting to other pipelines or equipment. The forward cleaning port 15 and the reverse cleaning port 17 are respectively used to connect to the target cleaning equipment to achieve forward cleaning / reverse cleaning, and the sewage discharge port 14 is used to connect the liquid storage tank 7 and the sewage discharge tank for discharging sewage and the like after the cleaning is completed. During forward cleaning, the flow direction of the cleaning liquid is: the liquid outlet 18 of the liquid storage tank 7 → the variable-frequency cleaning pump 3 → the liquid inlet 16 of the five-way valve → the forward cleaning port 15 of the five-way valve 12 → the liquid inlet of the heat exchanger → the liquid outlet of the heat exchanger → the reverse cleaning port 17 of the five-way valve 12 → the liquid return port 10 of the five-way valve 12 → the high-frequency generating module 8 of the return water pipeline → the liquid return port of the liquid storage tank 7; during reverse cleaning, the flow direction of the cleaning liquid is: the liquid outlet 18 of the liquid storage tank 7 → the variable-frequency cleaning pump 3 → the liquid inlet 16 of the five-way valve → the reverse cleaning port 17 of the five-way valve 12 → the liquid outlet of the heat exchanger → the liquid inlet of the heat exchanger → the forward cleaning port 15 of the five-way valve 12 → the liquid return port 10 of the five-way valve 12 → the high-frequency generating module 8 of the return water pipeline → the liquid return port of the liquid storage tank 7. During sewage discharge, the flow direction of the cleaning liquid is: the liquid outlet 18 of the liquid storage tank 7 → the variable-frequency cleaning pump 3 → the liquid inlet 16 of the five-way valve → the sewage discharge port 14 of the five-way valve 12 → the external sewage storage tank. Thus, the three functions of forward cleaning, reverse cleaning, and sewage discharge of the heat exchanger are achieved.

[0040] In practice, the high-frequency cleaning equipment for heat exchangers includes a mobile vehicle frame 1. At least one set of steering wheels 2 is provided at the bottom of the mobile vehicle frame 1. The controller is connected to the steering wheels 2 for automatic control of the traveling direction. The liquid storage tank 7, the high-frequency generating module 8 of the return water pipeline, and the five-way valve 12 are respectively arranged on the mobile vehicle frame 1. A control cabinet 13 is also arranged on the mobile vehicle frame 1. An human-machine interaction panel, a controller, and a power module are arranged in the control cabinet 13. The human-machine interaction panel, such as a touch screen, is used for human-machine interaction and control. The controller is a PLC controller, and the power module is a transformer for converting the commercial power to provide a suitable working voltage. The controller is connected to the human-machine interaction panel and the first high-frequency generator. A variable-frequency cleaning pump 3 is also arranged on the mobile vehicle frame 1. The variable-frequency cleaning pump 3 is respectively connected to the liquid outlet 18 of the liquid storage tank 7 and the liquid inlet 16 of the five-way valve. The controller is connected to the variable-frequency cleaning pump 3. A mixing tank 9 is arranged on the mobile vehicle frame 1. The mixing tank 9 is a common mixing tank 9 with stirring blades driven by a motor inside. A feed inlet is arranged at the top of the mixing tank 9 for injecting water and cleaning agents to combine high-frequency oscillation and chemical agents for cleaning and improving the cleaning effect. The controller is connected to the stirring motor of the mixing tank 9. A solenoid valve is arranged corresponding to the mixing tank 9 at the liquid outlet 18 of the liquid storage tank 7. The liquid outlet end of the mixing tank 9 is connected to the liquid outlet end of the solenoid valve, that is, the liquid outlet of the mixing tank 9 is connected between the solenoid valve and the variable-frequency cleaning pump 3. Before the medicament is uniformly stirred and injected into the heat exchanger, the solenoid valve is first closed, and then the medicament is injected into the heat exchanger to avoid affecting the liquid discharge due to the thick pipeline and large flow between the liquid storage tank 7 and the variable-frequency cleaning pump 3. After the liquid medicine is injected, the solenoid valve is opened and the high-frequency generating module 8 of the return water pipeline is started. The cleaning liquid in the liquid storage tank 7 enters the heat exchanger for high-frequency cleaning.

[0041] In this embodiment, an overflow port 4 and a vent port 6 are arranged on the liquid storage tank 7. The overflow port 4 is used to communicate with an external overflow tank. Due to the oscillation effect, the liquid level in the liquid storage tank 7 fluctuates and foams will be generated. At this time, it is collected through the overflow port 4 into the overflow tank. In reality, a liquid level gauge is arranged in the liquid storage tank 7, and when the liquid level drops to a preset position, liquid replenishment is carried out through the water injection port 5 at the top of the liquid storage tank 7. The vent port 6 is used to communicate with the external air to avoid excessive air pressure in the liquid storage tank 7 caused by the oscillation of the reflux liquid.

[0042] Embodiment 2

[0043] The difference between this embodiment and Embodiment 1 is that a high-frequency generating module is also arranged on the water inlet pipeline, that is, the high-frequency generating module of the water inlet pipeline.

[0044] Specifically, the high-frequency generating module of the water inlet pipeline includes a second high-frequency generator and a second high-frequency intensity adjusting mechanism which are integrally arranged. The liquid outlet of the variable-frequency cleaning pump is communicated with the liquid inlet of the second high-frequency generator, and the liquid outlet of the second high-frequency generator is communicated with the liquid inlet of the five-way valve; the second high-frequency intensity adjusting mechanism is arranged in the second high-frequency generator. In this embodiment, the structure and working principle of the high-frequency generating module of the water inlet pipeline are the same as those of the high-frequency generating module of the water return pipeline, and will not be described in detail.

[0045] The second high-frequency generator and the second high-frequency intensity adjusting mechanism are arranged on the water inlet pipeline for conveying the cleaning medium to the heat exchanger, and the first high-frequency generator and the first high-frequency intensity adjusting mechanism are arranged on the water return pipeline for discharging the cleaning medium from the heat exchanger. The two groups of high-frequency generators and high-frequency intensity adjusting mechanisms cooperate with each other to work. By modifying the high-frequency time T1 of the high-frequency generating module of the water inlet pipeline and the high-frequency time T2 of the high-frequency generating module of the water return pipeline, the jointly generated high-frequency vibration acts on the positions at different heights of the plate heat exchanger, forming impact force and disturbance in the heat exchanger, so as to peel off impurities, dirt and other sundries in the heat exchanger, achieving a better cleaning effect. The cleaning effect can be reflected by the high-frequency intensity and pressure difference of the cleaning medium. For example, Figure 4 - Figure 6 are the high-frequency intensity test comparisons under three structural modes of the high-frequency generating module, Figure 7 - Figure 9 are the pressure difference test comparisons under three structural modes of the high-frequency generating module. For the existing high-frequency cleaning equipment of the heat exchanger, the high-frequency intensity is between 0-3 bar, and the pressure difference drops to about 215 KPa after cleaning; while in this embodiment, when the high-frequency generating modules are arranged on both the water inlet and return pipelines, the high-frequency intensity can reach between 0-6 bar, and the pressure difference drops to about 100 KPa after cleaning, and the effect is improved by more than 50%, with obvious improvement.

[0046] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed claims.

Claims

1. A high-frequency cleaning device for a heat exchanger, characterized in that: It includes a liquid storage tank, a high-frequency generating module for the return water pipeline, and a five-way valve. The high-frequency generating module for the return water pipeline is arranged on the return water pipeline. The high-frequency generating module for the return water pipeline includes a first high-frequency generator and a first high-frequency intensity adjusting mechanism. The liquid outlet of the liquid storage tank is communicated with the liquid inlet of the five-way valve. The liquid return port of the five-way valve is connected to the liquid inlet of the first high-frequency generator. The liquid outlet of the first high-frequency generator is communicated with the liquid return port of the liquid storage tank. The first high-frequency intensity adjusting mechanism is arranged in the first high-frequency generator and is used to adjust the high-frequency intensity.

2. The high-frequency cleaning equipment for heat exchangers according to claim 1, characterized in that: It includes a mobile vehicle frame. The liquid storage tank, the high-frequency generating module for the return water pipeline, and the five-way valve are respectively arranged on the mobile vehicle frame. A control cabinet is also arranged on the mobile vehicle frame. An interactive panel, a controller, and a power module are arranged in the control cabinet. The power module is used to provide voltage. The controller is controlled to connect the interactive panel and the high-frequency generating module for the return water pipeline.

3. The high-frequency cleaning device for heat exchangers according to claim 2, characterized in that: The five-way valve includes a valve control motor and a valve body. The valve control motor is used to control the port switching of the valve body. The controller is controlled to connect the valve control motor. The ports of the valve body respectively include a liquid inlet, a liquid return port, a forward cleaning port, a reverse cleaning port, and a sewage discharge port. Connecting flanges are respectively arranged at the ports of the valve body. The forward cleaning port and the reverse cleaning port are respectively used to communicate with the liquid storage tank and the target cleaning equipment. The sewage discharge port is used to communicate with the liquid storage tank and the external sewage tank.

4. The high-frequency cleaning equipment for heat exchangers according to claim 2, wherein: A variable-frequency cleaning pump is arranged on the mobile vehicle frame. The variable-frequency cleaning pump is respectively communicated with the liquid outlet of the liquid storage tank and the liquid inlet of the five-way valve. The controller is controlled to connect the variable-frequency cleaning pump.

5. The high-frequency cleaning equipment for heat exchangers according to claim 2, characterized in that: A mixing tank is arranged on the mobile vehicle frame. A solenoid valve is arranged corresponding to the mixing tank at the liquid outlet of the liquid storage tank. The liquid outlet end of the mixing tank is communicated with the liquid outlet end of the solenoid valve. A feed inlet is arranged at the top of the mixing tank. The controller is controlled to connect the mixing tank and the solenoid valve.

6. The high-frequency cleaning device for a heat exchanger according to claim 2, wherein: At least one set of steering wheels is arranged at the bottom of the mobile vehicle frame. The controller is controlled to connect the steering wheels. A water injection port, an overflow port, and a deflation port are arranged on the liquid storage tank. The water injection port is used to communicate with an external water source. The overflow port is used to communicate with an external overflow tank. The deflation port is used to communicate with external air.

7. The high-frequency cleaning equipment for heat exchangers according to claim 1, characterized in that: It includes a high-frequency generating module for the water inlet pipeline. The high-frequency generating module for the water inlet pipeline is arranged on the water inlet pipeline. The high-frequency generating module for the water inlet pipeline includes a second high-frequency generator and a second high-frequency intensity adjusting mechanism. The liquid outlet of the variable-frequency cleaning pump is communicated with the liquid inlet of the second high-frequency generator. The liquid outlet of the second high-frequency generator is communicated with the liquid inlet of the five-way valve. The second high-frequency intensity adjusting mechanism is arranged in the second high-frequency generator and is used to adjust the high-frequency intensity. The controller is controlled to connect the high-frequency generating module for the water inlet pipeline.

8. The high-frequency cleaning device for a heat exchanger according to claim 7, characterized in that: The first high-frequency generator and the first high-frequency intensity adjusting mechanism of the high-frequency generating module for the return water pipeline are integrally arranged. The second high-frequency generator and the second high-frequency intensity adjusting mechanism of the high-frequency generating module for the water inlet pipeline are integrally arranged.

9. The high-frequency cleaning device for heat exchangers according to claim 8, wherein: The first high-frequency generator and the second high-frequency generator respectively include a pneumatic high-frequency valve, an air pump and a solenoid valve. A valve rod and a flow channel are arranged inside the pneumatic high-frequency valve. A valve plate for opening and closing the flow channel is arranged at the end of the valve rod corresponding to the middle of the flow channel. The high-frequency generating mechanism inside the pneumatic high-frequency valve includes a piston chamber, a piston and a first spring. The piston is arranged in the middle of the valve rod and is movably arranged inside the piston chamber. The first spring is arranged between the piston and the top wall inside the piston chamber. An air chamber is formed between the bottom of the piston and the bottom of the piston chamber. An air inlet and an air outlet are respectively arranged on the chamber wall of the piston chamber corresponding to the air chamber. The controller is respectively connected to the air pump and the solenoid valve in a controlled manner. The solenoid valve itself has an air inlet passage and an air outlet passage. The air pump is respectively communicated with the air source and the air inlet port of the air inlet passage of the solenoid valve. The air inlet of the air chamber is communicated with the air outlet port of the air inlet passage of the solenoid valve, and the air outlet of the air chamber is communicated with the air inlet port of the air outlet passage of the solenoid valve. The air outlet port of the air outlet passage of the solenoid valve is used for communicating with the outside.

10. The high-frequency cleaning equipment for heat exchangers according to claim 9, characterized in that: The first high-frequency intensity adjusting mechanism and the second high-frequency intensity adjusting mechanism respectively include a servo motor, a first bevel gear, a second bevel gear and an intensity adjusting member. The rotating shaft of the servo motor is horizontally arranged and is drivingly connected to the first bevel gear. The second bevel gear is rotatably arranged at the outer top of the piston chamber. The first bevel gear is meshed and connected with the second bevel gear. A gear through hole is arranged in the middle of the second bevel gear. A key groove is vertically arranged on the hole side wall of the gear through hole. A limiting key is arranged on the side wall of the valve rod axially corresponding to the key groove. The valve rod is movably arranged inside the gear through hole. The intensity adjusting member includes a first adjusting hole and a second adjusting hole. A plurality of first adjusting holes are uniformly arranged on the valve plate. A plurality of second adjusting holes are respectively arranged in the flow channel corresponding to the first adjusting holes. The controller is connected to the servo motor in a controlled manner.

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