Automatic cleaning system for plate heat exchanger

Abstract

The utility model belongs to the technical field of heat exchanger cleaning equipment, and discloses an automatic cleaning system for a plate heat exchanger, which comprises a plate heat exchanger main body, a cleaning pipe group, a control valve group and a control water pump, and the plate heat exchanger main body is provided with a water inlet and a water outlet; the cleaning pipe group comprises a water inlet pipe, a water outlet pipe and a connecting pipe, and the water inlet pipe is communicated with the water inlet; the water outlet pipe is communicated with the water outlet; the connecting pipe is suitable for being connected with the water inlet pipe and the water outlet pipe, and a circulation loop is formed between the plate heat exchanger body and the cleaning pipe set. The control valve group comprises a first control valve and a second control valve, the first control valve is mounted at an inlet of the water inlet pipe, and the second control valve is suitable for being mounted at an outlet of the water outlet pipe; according to the cleaning device for the plate heat exchanger, dirt in the plate heat exchanger can be well cleaned, efficiency is high, and operation is easy and convenient.

Description

Technical Field

[0001] The utility model relates to an automatic cleaning system for a plate heat exchanger, belonging to the technical field of heat exchanger cleaning equipment. Background Art

[0002] Plate heat exchangers are widely used in heating, cooling, process heat recovery, power plants, marine and offshore drilling, district heating and refrigeration systems, and other fields. Due to their inherent structural problems, during daily use, dust, aquatic organisms, scale, various sediments, etc. in the environment will be blocked in the plates of the plate heat exchanger as the water circulates. These blockages will greatly reduce heat transfer efficiency and increase pressure drop. Some dirt may damage the plates and cause uneven fluid distribution. After searching, it was found that Chinese patent announcement number CN221464399U discloses an easy-to-clean plate heat exchanger. In this patent, heat exchange is accomplished through exchange tubes and exchange plates. A water pump draws cleaning water from a water tank, pressurizes it, and sprays it from a sprinkler head. The rotating block rotates the threaded rod, driving the sliding block to slide on the guide rail, cleaning the surface of the plate heat exchanger. The air outlet blows out hot air to dry the device. The wastewater generated by cleaning is diverted through a guide plate into a filter screen. A vibrating motor drives the filter screen to vibrate the contaminants stuck to the guide plate, causing them to fall off and be collected. However, this patent only cleans the exterior of the exchange plates and cannot handle dirt inside them. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide an automatic cleaning system for a plate heat exchanger, which can effectively clean the internal dirt of the plate heat exchanger with high efficiency and easy operation.

[0004] In order to solve the above technical problems, the technical solution of the utility model is:

[0005] An automatic cleaning system for a plate heat exchanger, comprising:

[0006] A plate heat exchanger body, wherein the plate heat exchanger body is provided with a water inlet and a water outlet;

[0007] A cleaning pipe group, the cleaning pipe group comprising a water inlet pipe, a water outlet pipe and a connecting pipe, the water inlet pipe being connected to the water inlet; the water outlet pipe being connected to the water outlet; the connecting pipe being adapted to connect the water inlet pipe and the water outlet pipe, forming a circulation loop between the plate heat exchanger body and the cleaning pipe group;

[0008] A control valve group, the control valve group comprising a first control valve and a second control valve, the first control valve being installed at the inlet of the water inlet pipe, and the second control valve being suitable for being installed at the outlet of the water outlet pipe;

[0009] A control water pump is installed on the water inlet pipe, and the control water pump is suitable for connecting to an external cleaning water source to provide cleaning water to the circulation loop.

[0010] Furthermore, the cleaning pipe group also includes a first branch pipe, which is arranged on the water inlet pipe. The first branch pipe is provided with a first port and a second port. The first port is connected to a position on the water inlet pipe, and the second port is connected to another position on the water inlet pipe.

[0011] Furthermore, in order to control the on-off of the first branch pipe, the control valve group further includes a third control valve, and the third control valve is installed on the first branch pipe.

[0012] Furthermore, the cleaning pipe group also includes a second branch pipe, the second branch pipe is provided with a third port and a fourth port, the third port is connected to the water inlet pipe, and the fourth port is connected to the connecting pipe.

[0013] Furthermore, in order to control the on-off of the second branch pipe, the control valve group further includes a fourth control valve, and the fourth control valve is installed on the second branch pipe.

[0014] Furthermore, in order to change the flow direction, the control valve group further includes a fifth control valve, which is installed on the connecting pipe and disposed between the fourth port and the water inlet pipe.

[0015] Furthermore, the control valve group further includes a sixth control valve, which is installed on the water inlet pipe and arranged between the third port and the second port.

[0016] Furthermore, in order to better remove dirt, the plate heat exchanger automatic cleaning system also includes a descaling pipe, which is connected to the water outlet pipe. The control valve group also includes a seventh control valve, which is installed on the descaling pipe. The descaling pipe is suitable for adding descaling agent into the circulation loop.

[0017] Furthermore, in order to discharge sewage from the circulation loop, the plate heat exchanger automatic cleaning system also includes a drain pipe, which is connected to the water inlet pipe. The control valve group also includes an eighth control valve, which is installed on the drain pipe. The drain pipe is suitable for discharging sewage in the circulation loop.

[0018] Beneficial effects

[0019] In the present invention, the inside of the heat exchanger is cleaned by controlling different control valves to maintain its efficient operation and extend its service life. There are two cleaning modes, namely positive cycle cleaning and reverse cycle cleaning. The external controller controls the closing of the first control valve, the second control valve, the third control valve, the fourth control valve and the eighth control valve, and opens the fifth control valve, the sixth control valve and the seventh control valve. The control water pump is turned on to deliver cleaning water to the circulation loop. The control water pump can control the flow rate and pressure of the cleaning water. A descaling agent is added to the circulation loop through the descaling pipe. The descaling agent is mixed with the cleaning water to remove dirt. The reaction causes it to fall off or dissolve, and the mixed liquid of cleaning water and descaling agent flows through the water inlet pipe, the plate heat exchanger body, the water outlet pipe and the connecting pipe, and performs multiple positive cycle cleaning; then the external controller controls to close the fifth control valve and the sixth control valve, and opens the third control valve and the fourth control valve, and the mixed liquid of cleaning water and descaling agent flows through the second branch pipe, the connecting pipe, the water outlet pipe, the plate heat exchanger body, the water inlet pipe and the first branch pipe, and performs multiple reverse cycle cleaning; finally, the external controller controls to open the eighth control valve, and the mixed liquid and the dirt carried in the mixed liquid are discharged from the drain pipe, thereby completing the internal cleaning of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 .Schematic diagram of the positive cycle cleaning of the plate heat exchanger automatic cleaning system;

[0021] Figure 2 . Schematic diagram of reverse circulation cleaning of the plate heat exchanger automatic cleaning system. DETAILED DESCRIPTION

[0022] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0023] like Figure 1-2 As shown, a plate heat exchanger automatic cleaning system includes:

[0024] The plate heat exchanger body 1 is provided with a water inlet 11 and a water outlet 12;

[0025] The cleaning pipe group includes an inlet pipe 21, an outlet pipe 22 and a connecting pipe 23. The inlet pipe 21 is connected to the water inlet 11; the outlet pipe 22 is connected to the water outlet 12; the connecting pipe 23 is suitable for connecting the inlet pipe 21 and the outlet pipe 22, forming a circulation loop between the plate heat exchanger body 1 and the cleaning pipe group;

[0026] The control valve group includes a first control valve 31 and a second control valve 32. The first control valve 31 is installed at the inlet of the water inlet pipe 21, and the second control valve 32 is suitable for installation at the outlet of the water outlet pipe 22;

[0027] The control water pump 4 is installed on the water inlet pipe 21 and is suitable for connecting to an external cleaning water source to provide cleaning water to the circulation loop.

[0028] In this embodiment, the control water pump 4 can control the flow and pressure of the cleaning water. The control water pump 4 is provided with a water pump inlet and a water pump outlet. The water pump outlet faces the water inlet 11, and the water pump inlet faces the first control valve 31. The control water pump 4 is suitable for extracting an external cleaning water source and providing cleaning water to the circulation loop through the water pump outlet. The cleaning water flows into the plate heat exchanger body 1 from the water inlet 11, flows out from the water outlet 12 and flows to the water pump inlet, and then flows out from the water pump outlet.

[0029] Specifically, if Figure 1-2 As shown, the cleaning pipe group also includes a first branch pipe 24, which is arranged on the water inlet pipe 21. The first branch pipe 24 is provided with a first port 241 and a second port 242. The first port 241 is connected to a position on the water inlet pipe 21, and the second port 242 is connected to another position on the water inlet pipe 21.

[0030] Specifically, if Figure 1-2 As shown, the control valve group further includes a third control valve 33 , which is installed on the first branch pipe 24 .

[0031] Specifically, if Figure 1-2 As shown, the cleaning pipe group further includes a second branch pipe 25 , which is provided with a third port 251 and a fourth port 252 . The third port 251 is connected to the water inlet pipe 21 , and the fourth port 252 is connected to the connecting pipe 23 .

[0032] Specifically, if Figure 1-2 As shown, the control valve group further includes a fourth control valve 34 , which is installed on the second branch pipe 25 .

[0033] Specifically, if Figure 1-2 As shown, the control valve group further includes a fifth control valve 35 , which is installed on the connecting pipe 23 and disposed between the fourth port 252 and the water inlet pipe 21 .

[0034] Specifically, if Figure 1-2 As shown, the control valve group further includes a sixth control valve 36 , which is installed on the water inlet pipe 21 and disposed between the third port 251 and the second port 242 .

[0035] Specifically, if Figure 1-2As shown, the plate heat exchanger automatic cleaning system also includes a descaling pipe 5, which is connected to the water outlet pipe 22. The control valve group also includes a seventh control valve 37, which is installed on the descaling pipe 5. The descaling pipe 5 is suitable for adding descaling agent to the circulation loop.

[0036] Specifically, if Figure 1-2 As shown, the plate heat exchanger automatic cleaning system also includes a drain pipe 6, which is connected to the water inlet pipe 21. The control valve group also includes an eighth control valve 38, which is installed on the drain pipe 6. The drain pipe 6 is suitable for discharging sewage in the circulation loop.

[0037] In this embodiment, the eight control valves of the control valve group may be electrically controlled valves.

[0038] In this embodiment, the inside of the heat exchanger is cleaned by controlling different control valves to maintain its efficient operation and extend its service life. There are two cleaning modes, namely positive cycle cleaning and reverse cycle cleaning. The external controller controls the closing of the first control valve 31, the second control valve 32, the third control valve 33, the fourth control valve 34 and the eighth control valve 38, and opens the fifth control valve 35, the sixth control valve 36 and the seventh control valve 37. The control water pump 4 is turned on to deliver cleaning water to the circulation loop. The control water pump 4 can control the flow rate and pressure of the cleaning water. A descaling agent is added to the circulation loop through the descaling pipe 5. The descaling agent is mixed with the cleaning water to react with the dirt. The mixed liquid of cleaning water and descaling agent flows through the water inlet pipe 21, the plate heat exchanger body 1, the water outlet pipe 22 and the connecting pipe 23, and performs multiple positive circulation cleaning; then the external controller controls the closing of the fifth control valve 35 and the sixth control valve 36, and the opening of the third control valve 33 and the fourth control valve 34, and the mixed liquid of cleaning water and descaling agent flows through the second branch pipe 25, the connecting pipe 23, the water outlet pipe 22, the plate heat exchanger body 1, the water inlet pipe 22 and the first branch pipe 24, and performs multiple reverse circulation cleaning; finally, the external controller controls the opening of the eighth control valve 38 to discharge the mixed liquid and the dirt carried in the mixed liquid from the drain pipe 6, thereby completing the internal cleaning of the heat exchanger.

[0039] The device can automatically complete the cyclic cleaning of the plate heat exchanger body regularly or irregularly according to the on-site working conditions and utilize the idle time when no production is performed, effectively preventing the accumulation of blockages, greatly improving work efficiency and reducing labor intensity.

[0040] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A plate heat exchanger automatic cleaning system, characterized in that: include: A plate heat exchanger body (1), wherein the plate heat exchanger body (1) is provided with a water inlet (11) and a water outlet (12); A cleaning pipe group, the cleaning pipe group comprising a water inlet pipe (21), a water outlet pipe (22) and a connecting pipe (23), the water inlet pipe (21) being connected to the water inlet (11); the water outlet pipe (22) being connected to the water outlet (12); the connecting pipe (23) being suitable for connecting the water inlet pipe (21) and the water outlet pipe (22), forming a circulation loop between the plate heat exchanger body (1) and the cleaning pipe group; A control valve group, the control valve group comprising a first control valve (31) and a second control valve (32), the first control valve (31) being installed at the inlet of the water inlet pipe (21), and the second control valve (32) being suitable for being installed at the outlet of the water outlet pipe (22); A control water pump (4) is installed on the water inlet pipe (21), and the control water pump (4) is suitable for connecting to an external cleaning water source to provide cleaning water to the circulation loop.

2. The plate heat exchanger automatic cleaning system according to claim 1, characterized in that: The cleaning pipe assembly further comprises a first branch pipe (24), the first branch pipe (24) being arranged on the water inlet pipe (21), the first branch pipe (24) being provided with a first port (241) and a second port (242), the first port (241) being connected to a position on the water inlet pipe (21), and the second port (242) being connected to another position on the water inlet pipe (21).

3. The plate heat exchanger automatic cleaning system according to claim 2, characterized in that: The control valve group further includes a third control valve (33), and the third control valve (33) is installed on the first branch pipe (24).

4. The automatic cleaning system for plate heat exchanger according to claim 2, characterized in that: The cleaning pipe assembly further comprises a second branch pipe (25), the second branch pipe (25) being provided with a third port (251) and a fourth port (252), the third port (251) being connected to the water inlet pipe (21), and the fourth port (252) being connected to the connecting pipe (23).

5. The automatic cleaning system for plate heat exchanger according to claim 4, characterized in that: The control valve group further includes a fourth control valve (34), and the fourth control valve (34) is installed on the second branch pipe (25).

6. The automatic cleaning system for plate heat exchanger according to claim 5, characterized in that: The control valve group further includes a fifth control valve (35), which is installed on the connecting pipe (23) and disposed between the fourth port (252) and the water inlet pipe (21).

7. The automatic cleaning system for plate heat exchanger according to claim 4, characterized in that: The control valve group further includes a sixth control valve (36), which is installed on the water inlet pipe (21) and arranged between the third port (251) and the second port (242).

8. The automatic cleaning system for plate heat exchanger according to claim 1, characterized in that: Also includes: A descaling pipe (5), the descaling pipe (5) is connected to the water outlet pipe (22), the control valve group further includes a seventh control valve (37), the seventh control valve (37) is installed on the descaling pipe (5), and the descaling pipe (5) is suitable for adding a descaling agent into the circulation loop.

9. The automatic cleaning system for plate heat exchanger according to claim 1, characterized in that: Also includes: A sewage pipe (6), the sewage pipe (6) is connected to the water inlet pipe (21), the control valve group further includes an eighth control valve (38), the eighth control valve (38) is installed on the sewage pipe (6), and the sewage pipe (6) is suitable for discharging sewage in the circulation loop.

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