Off-line cleaning device and method for filter of direct-current converter valve cooling water system

Abstract

According to the off-line cleaning device and method for the filter of the cooling water system of the direct-current converter valve, the defects existing in the prior art are overcome, the device can effectively solve the problem that thorough cleaning of a filter element is difficult to achieve through a traditional off-line cleaning method, the membrane flux of the cleaned filter element is restored to the initial state, and the cleaning efficiency and quality are improved; the device comprises a box body and a control unit, the control unit is installed on the outer side of the box body, and a cleaning box, a dosing pump and a cleaning pump are arranged in the box body; an ultrasonic oscillator, a filtering element and a fixing device are arranged in the cleaning box, a heater is arranged on the outer side wall of the cleaning box, the top of the cleaning box is communicated with the outside through an exhaust pipeline fixedly connected with the cleaning box, and an exhaust valve is installed on the exhaust pipeline; an external water source is introduced into an inlet of the cleaning pump through an external water inlet pipeline fixedly connected with the cleaning pump; and an inlet of the dosing pump is connected with an external medicament supply device through a medicament inlet pipeline.

Description

Technical Field

[0001] The invention relates to the technical field of cleaning of a DC converter valve cooling water system, and in particular to an off-line cleaning device for a filter of a DC converter valve cooling water system. Background Art

[0002] With the continuous optimization of my country's energy structure and the continuous growth of electricity demand, UHV DC transmission technology plays a vital role in realizing the large-scale optimization of energy resources. The West-to-East Power Transmission Project, such as the Xinjiang Power Transmission Project, not only alleviates the energy shortage problem in the eastern and central regions, but also promotes energy development in the western and northern regions. However, the stable operation of these large-scale transmission projects is inseparable from the reliable operation of the key equipment - the converter valve. As the core component of the DC transmission system, the performance of the converter valve directly affects the efficiency and safety of the entire transmission system.

[0003] The converter valve generates a lot of heat during operation, which must be effectively dissipated by the cooling water system. The health of the cooling water system is directly related to the stable operation of the converter valve. However, during the long-term operation of the cooling water system, due to factors such as water quality and environment, it is easy to produce impurities such as corrosion products and scaling. These impurities will not only reduce the cooling efficiency, but also clog the filter, affect the circulation of cooling water, and thus pose a threat to the safe operation of the converter valve.

[0004] At present, the cleaning of filters in cooling water systems mainly relies on traditional offline cleaning methods, that is, chemical flushing is the main method, supplemented by simple water flushing. However, this method has many shortcomings:

[0005] 1. The cleaning effect is not thorough: Although chemical flushing can remove some dirt, it is difficult to completely remove stubborn stains and deep blockages on the surface of the filter element.

[0006] 2. Decreased filter element performance: The filter element membrane flux after cleaning often cannot be fully restored to its initial state, resulting in reduced filtration efficiency and affecting the long-term performance of the system.

[0007] In view of the shortcomings of existing cleaning methods, it is of far-reaching significance to develop an offline cleaning device for the filter of the DC converter valve cooling water system. The newly developed cleaning device adopts more advanced cleaning technology and processes, such as physical cleaning, ultrasonic cleaning, etc., to achieve thorough cleaning of the filter element and restore its original performance. Improve cleaning efficiency and quality. Clean filters can ensure unobstructed cooling water system, thereby improving the stability and reliability of the converter valve, improving system reliability, and ensuring the safe operation of the entire DC transmission system.

[0008] In summary, the development of an efficient offline cleaning device for the filter of the DC converter valve cooling water system is of great significance for improving the overall level of my country's UHV DC transmission technology and ensuring national energy security. Summary of the invention

[0009] The present invention aims to address the technical defects of the prior art and provide an offline cleaning device and method for the filter of a DC converter valve cooling water system, which overcomes the shortcomings of the prior art. The device can effectively solve the problem that traditional offline cleaning methods are difficult to achieve thorough cleaning of the filter element, and restore the membrane flux of the filter element after cleaning to its initial state, thereby improving the cleaning efficiency and quality.

[0010] The present invention provides the following technical solution: an off-line cleaning device for a filter in a DC converter valve cooling water system, comprising a box and a control unit, wherein the control unit is installed outside the box, and a cleaning box, a dosing pump and a cleaning pump are arranged inside the box;

[0011] An ultrasonic oscillator, a filter element, and a fixing device are arranged inside the cleaning box, a heater is arranged on the outer wall of the cleaning box, the top of the cleaning box is communicated with the outside through an exhaust pipeline fixedly connected thereto, and an exhaust valve is installed on the exhaust pipeline;

[0012] The inlet of the cleaning pump is introduced into an external water source through an external water inlet pipeline fixedly connected thereto, one end of the external water inlet pipeline is located outside the box body, and the other end thereof is connected to the cleaning pump, and the inlet of the cleaning pump is also connected to the bottom of the cleaning box through a positive return water pipeline and a lower drainage pipeline, a positive return water valve is provided in the positive return water pipeline, a lower drainage valve is installed on the lower drainage pipeline, and the outlet of the cleaning pump is fixedly connected to the cleaning box through the water inlet pipeline;

[0013] The inlet of the dosing pump is connected to an external medicine supply device through a dosing pipeline, the other end of the dosing pipeline is located outside the box, the outlet of the dosing pump is fixedly connected to a water inlet pipeline through the dosing pipeline, and a pipeline mixer is arranged on the water inlet pipeline between the dosing pipeline and the cleaning box;

[0014] The cleaning pump, the dosing pump, the forward washing water return valve, the lower drainage valve, the exhaust valve, the ultrasonic oscillator and the heater are all connected to the control unit.

[0015] Preferably, the control unit includes an electrically connected power supply module and a control module, the power supply module is electrically connected to the cleaning pump, the dosing pump, the ultrasonic oscillator and the heater, the control module includes an intermediate relay, the intermediate relay is provided with multiple contacts, and the forward wash return valve, the lower drain valve and the exhaust valve are electrically connected to the intermediate relay through different contacts respectively.

[0016] Preferably, an upper drainage pipeline is fixedly connected between the upper and lower drainage pipelines of the cleaning box, an upper drainage pipeline is provided with an upper drainage valve, and the upper drainage valve is connected to the control unit.

[0017] Preferably, the water inlet pipeline between the cleaning pump and the dosing line extends to the bottom of the cleaning tank through a fixed connection and is connected to the backwashing pipeline. A backwashing water inlet valve is provided on the backwashing pipeline, and the backwashing water inlet valve is connected to the control unit for controlling the backwashing process.

[0018] Preferably, a water inlet valve is fixedly installed on the water inlet pipeline between the dosing pipeline and the backwashing pipeline, and the water inlet valve is connected to the control unit.

[0019] Preferably, a plurality of water caps are provided at the inner bottom of the cleaning box and / or a plurality of nozzles evenly spaced up and down are provided between the water inlet pipeline and one side of the cleaning box, the inlet of the nozzle is fixedly connected to the water inlet pipeline, and the outlet of the nozzle is fixedly connected to the inside of the cleaning box.

[0020] Preferably, the fixing device is used to fix the filter element, and the fixing device includes a water inlet channel and a plurality of fixed pipelines, both ends of the water inlet channel are fixedly connected to the inner wall of the bottom of the cleaning tank and are connected to the backwash pipeline, the upper end of the water inlet channel is connected to the cleaning tank through fixed pipelines fixed at intervals on the left and right, and the upper inner side of the fixed pipeline is provided with an internal thread for positioning and fixing the filter element.

[0021] Preferably, the forward wash return valve, lower drain valve, exhaust valve, upper drain valve, backwash inlet valve, and water inlet valve are configured as solenoid valves.

[0022] A method for off-line cleaning of a filter in a DC converter valve cooling water system comprises the following steps:

[0023] Step 1, first cycle positive wash;

[0024] Connect the external water source to the water inlet pipeline of the cleaning pump, open the water inlet valve and the exhaust valve, start the cleaning pump to fill water into the cleaning tank, when the exhaust pipeline starts to drain, close the exhaust valve and stop filling water, open the lower drain valve, start the first positive wash, after the water in the lower drain pipeline becomes clear, close the lower drain valve, open the positive wash return valve, start the cyclic positive wash process, and the cleaning water circulates through the positive return pipeline, flows through the cleaning pump and returns to the cleaning tank;

[0025] Step 2, physical and chemical cleaning;

[0026] During the cycle cleaning process, the control unit starts the ultrasonic oscillator and the heater. When the cleaning liquid reaches the set temperature threshold, the control unit starts the dosing pump, injects the cleaning agent into the water inlet pipeline through the dosing pipeline, and fully mixes it with water through the pipeline mixer. When the dosing amount reaches the set value, the dosing pump is stopped. This step performs chemical and physical cleaning at the same time;

[0027] Step 3, washing the filter element;

[0028] After the filter element is cleaned, the control unit stops the cleaning pump, closes the water inlet valve and the positive wash return valve, opens the lower drain valve and the exhaust valve, and discharges the waste liquid. After the waste liquid is drained, the lower drain valve is closed, the water inlet valve and the exhaust valve are opened, and the control unit starts the cleaning pump to see if water is discharged from the exhaust pipeline. If so, the exhaust valve is closed, and the lower drain valve is opened to discharge the cleaning water through the lower drain pipeline, completing the positive wash of the filter element;

[0029] Step 4, backwashing the filter element;

[0030] When the water discharged by the forward wash pump becomes clear, open the backwash inlet valve and the upper drain valve, close the lower drain valve, and start the upper backwash. When the water is clear, close the upper drain valve and open the lower drain valve to start the lower backwash. When the water is clear, stop the wash pump, close the backwash inlet valve, close the lower drain valve, and end the backwash.

[0031] Step 5, water washing;

[0032] Finally, open the water inlet valve and the forward wash return valve, close the backwash water inlet valve, start the cleaning pump, inject water into the cleaning tank, drain it through the forward and return water pipelines until it becomes clear, stop the cleaning pump, close the water inlet valve and the forward wash return valve, and complete the final water flushing.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] The invention discloses an off-line cleaning device for a filter of a DC converter valve cooling water system, which is an efficient and comprehensive cleaning device, and is intended to overcome the limitations of a traditional off-line cleaning method, ensure that the filter element is thoroughly cleaned, and restore its membrane flux to an initial state, thereby improving the cleaning efficiency and quality; the device comprises a box body and a control unit: the box body is the main body of the entire cleaning device, and is responsible for accommodating various components required for cleaning; the control unit is installed on the outside of the box body, and is used to centrally control various steps and components in the cleaning process, and ensure the efficiency and safety of the cleaning process; the cleaning box is the core area for cleaning the filter element, and key components such as an ultrasonic oscillator, a filter element, and a fixing device are arranged inside the box body; the ultrasonic oscillator uses the physical effect of ultrasonic waves to deeply clean the filter element and remove stubborn dirt; the filter element is fixed on the fixing device, and ensures that it remains stable during the cleaning process; the heater is installed on the outer wall of the cleaning box, and is used to adjust the temperature of the cleaning liquid and improve the cleaning effect; the top of the cleaning box is connected to the outside through an exhaust pipeline, and an exhaust valve is installed on the exhaust pipeline, and is used to discharge the gas generated during the cleaning process, and ensure the stability of the cleaning environment;

[0035] The inlet of the cleaning pump is introduced into the external water source through the external water inlet pipeline to provide sufficient water flow for the cleaning process. The inlet of the cleaning pump is also connected to the bottom of the cleaning tank through the positive return water pipeline and the lower drainage pipeline to realize the recycling of the cleaning liquid. The positive return water pipeline is provided with a positive wash return water valve for controlling the reflux of the cleaning liquid; the lower drainage pipeline is installed with a lower drainage valve for discharging waste water in the cleaning process. The inlet of the dosing pump is connected to the external agent supply device through the drug inlet pipeline to add the cleaning agent to the cleaning liquid. The outlet of the dosing pump is fixedly connected to the water inlet pipeline through the dosing pipeline. A pipeline mixer is provided on the water inlet pipeline between the dosing pipeline and the cleaning tank to ensure that the cleaning agent and the cleaning liquid are fully mixed.

[0036] The control unit can automatically adjust the working status of each component according to the preset cleaning program to realize the automation and intelligence of the cleaning process; the cleaning pump, dosing pump, positive wash return valve, lower drain valve, exhaust valve, ultrasonic oscillator and heater are all connected to the control unit and work together through the instructions of the control unit;

[0037] This device combines physical cleaning with ultrasonic oscillator and chemical cleaning with chemical cleaning agent to completely remove dirt and impurities on the surface of the filter element and restore the membrane flux of the filter element to its initial state. The cleaning process is automatically controlled, which reduces the tediousness and errors of manual operation and improves the cleaning efficiency. By accurately controlling parameters such as the temperature, flow rate and concentration of the cleaning liquid, the stability and consistency of the cleaning process are ensured, and the cleaning quality is guaranteed. In summary, this offline cleaning device for the filter of the DC converter valve cooling water system has the advantages of compact structure, comprehensive functions, good cleaning effect and high efficiency. It is an ideal choice for cleaning the filter of the cooling water system in the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a cross-sectional schematic diagram of the present invention;

[0039] Figure 2 It is a cleaning flow chart of the present invention;

[0040] Figure 3 for Figure 2 The first cycle forward wash flow chart in;

[0041] Figure 4 for Figure 2 Physical and chemical cleaning flow chart in;

[0042] Figure 5 for Figure 2 The forward wash filter element flow chart in;

[0043] Figure 6 for Figure 2 Backwash filter element flow chart in;

[0044] Figure 7 for Figure 2 Water flushing flow chart.

[0045] Description of reference numerals:

[0046] 1-box, 2-cleaning box, 3-dosing pump, 4-cleaning pump, 5-ultrasonic oscillator, 6-heater, 7-exhaust pipeline, 8-positive return pipeline, 9-lower drainage pipeline, 10-water inlet pipeline, 11-drug inlet pipeline, 12-dosing pipeline, 13-pipeline mixer, 14-upper drainage pipeline, 15-upper drainage valve, 16-backwash pipeline, 17-backwash inlet valve, 18-water inlet valve, 19-positive wash return valve, 20-lower drainage valve, 21-exhaust valve, 22-water cap, 23-nozzle, 24-water inlet channel, 25-fixed pipeline, 26-control unit. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. All other embodiments obtained by ordinary technicians in the field without making creative work based on the embodiments of the present invention shall fall within the scope of protection of the present invention.

[0048] like Figures 1 to 7 As shown, it shows a specific embodiment of the present invention: Figures 1 to 7 As shown, the present invention discloses an off-line cleaning device for a filter in a DC converter valve cooling water system, comprising a box 1 and a control unit 26, wherein the control unit 26 is installed outside the box 1, and a cleaning box 2, a dosing pump 3 and a cleaning pump 4 are arranged inside the box 1;

[0049] An ultrasonic oscillator 5, a filter element, and a fixing device are arranged inside the cleaning box 2. A heater 6 is arranged on the outer wall of the cleaning box 2. The top of the cleaning box 2 is connected to the outside through an exhaust pipeline 7 fixedly connected thereto. An exhaust valve 21 is installed on the exhaust pipeline 7.

[0050] The inlet of the cleaning pump 4 is introduced into an external water source through an external water inlet pipeline 10 fixedly connected thereto, one end of the external water inlet pipeline 10 is located outside the box body 1, and the other end thereof is connected to the cleaning pump 4, and the inlet of the cleaning pump 4 is also connected to the bottom of the cleaning box 2 through a positive return water pipeline 8 and a lower drainage pipeline 9, a positive return water valve 19 is provided in the positive return water pipeline 8, and a lower drainage valve 20 is installed on the lower drainage pipeline 9, and the outlet of the cleaning pump 4 is fixedly connected to the cleaning box 2 through the water inlet pipeline 10;

[0051] The inlet of the dosing pump 3 is connected to an external medicine supply device through a dosing pipeline 11, the other end of the dosing pipeline 11 is located outside the box 1, the outlet of the dosing pump 3 is fixedly connected to the water inlet pipeline 10 through a dosing pipeline 12, and a pipeline mixer 13 is provided on the water inlet pipeline 10 between the dosing pipeline 12 and the cleaning box 2;

[0052] The cleaning pump 4 , the dosing pump 3 , the forward wash water return valve 19 , the lower drain valve 20 , the exhaust valve 21 , the ultrasonic oscillator 5 and the heater 6 are all connected to the control unit 26 .

[0053] Preferably, Figure 1 As shown, the control unit 26 includes an electrically connected power module and a control module, the power module is electrically connected to the cleaning pump 4, the dosing pump 3, the ultrasonic oscillator 5 and the heater 6, the control module includes an intermediate relay, the intermediate relay is provided with multiple contacts, and the positive wash return valve 19, the lower drain valve 20, and the exhaust valve 21 are electrically connected to the intermediate relay through different contacts.

[0054] The control unit 26 in this device is the core control part, which is mainly composed of two parts: a power module and a control module. These two parts work together through electrical connection to jointly control various components in the cleaning process. The power module is electrically connected to the control module, and the power module is responsible for providing power to the cleaning pump 4, the dosing pump 3, the ultrasonic oscillator 5 and the heater 6, while the control module is responsible for the specific control logic.

[0055] The control module is the core control part of the control unit 26, which is mainly composed of electrical components such as intermediate relays. The intermediate relay is a commonly used electrical control component with multiple contacts, which can realize the on-off control of multiple circuits. In the cleaning device, the intermediate relay is electrically connected to the components such as the forward wash return valve 19, the lower drain valve 20, and the exhaust valve 21 through its multiple contacts, thereby controlling the opening and closing of these components and realizing precise control of these valves.

[0056] The multiple contacts of the intermediate relay are respectively connected to the control ends of components such as the forward wash return valve 19, the lower drain valve 20, and the exhaust valve 21. When the control module receives the instructions of the cleaning program, it controls the opening and closing of these components through the contacts of the intermediate relay, thereby realizing precise control of the cleaning process.

[0057] Working principle of this device: During the cleaning process, Figures 2 to 7 As shown, the control unit 26 will provide power to each component through the power module according to the preset cleaning program, and control the opening and closing of each component through the intermediate relay in the control module. Specifically, when the control unit issues an instruction, the coil of the intermediate relay is energized, so that the moving iron core moves and closes under the action of electromagnetic force, driving the moving contact to move. In this way, the normally closed contacts are separated and the normally open contacts are closed, thereby realizing the control of the solenoid valve connected to these contacts. When the coil is powered off, the moving iron core is reset under the action of the spring, and the contact returns to the initial state. The operation of components such as the cleaning pump 4, the dosing pump 3, the ultrasonic oscillator 5 and the heater 6 is controlled in sequence, and the opening and closing of components such as the positive wash return valve 19, the lower drain valve 20, and the exhaust valve 21 are controlled according to the cleaning needs, thereby realizing comprehensive control of the cleaning process.

[0058] In summary, the device controls the solenoid valve through the intermediate relay, realizes the precise control of the key valves in the cleaning process, improves the cleaning efficiency and quality, and also enhances the stability and reliability of the system.

[0059] Preferably, Figure 1 As shown, an upper drainage pipeline 14 is fixedly connected between the upper part of the cleaning box 2 and the lower drainage pipeline 9 , and an upper drainage valve 15 is provided on the upper drainage pipeline 14 , and the upper drainage valve 15 is connected to the control unit 26 .

[0060] In the offline cleaning device of the filter of the DC converter valve cooling water system, the design of the cleaning box 2 is crucial. It not only accommodates key components such as ultrasonic oscillators and filter elements, but is also connected to external water sources, dosing devices, etc. through a series of pipelines and valves to form a complete cleaning system. Among them, the upper drainage pipeline 14 and the upper drainage valve 15 thereon are an important component of the cleaning box 2. The upper drainage pipeline 14 is fixedly connected between the upper part of the cleaning box 2 and the lower drainage pipeline 9, which means that during the cleaning process, in addition to discharging wastewater through the lower drainage pipeline 9, it can also be discharged through the upper drainage pipeline 14. Such a design increases the flexibility of discharging wastewater, and a suitable discharge method can be selected according to actual needs.

[0061] The upper drain valve 15 is installed on the upper drain line 14 and is used to control the opening and closing of the upper drain line. When it is necessary to discharge the waste water on the upper part of the cleaning tank 2, the upper drain valve 15 can be opened to discharge the waste water through the upper drain line 14. The upper drain valve 15 is connected to the control unit 26, and the control unit 26 can monitor and control the state of the upper drain valve 15 in real time. During the cleaning process, the control unit 26 can automatically control the opening and closing of the upper drain valve 15 according to the preset cleaning program or actual needs.

[0062] Among them, the upper drainage pipeline 14 and the upper drainage valve 15 thereon play an important role in the offline cleaning device of the filter of the DC converter valve cooling water system. They work together with the control unit 26 to achieve precise control of the cleaning process.

[0063] Preferably, Figure 1 As shown, the water inlet pipeline 10 between the cleaning pump 4 and the dosing pipeline 12 extends to the bottom of the cleaning tank 2 through a fixed connection, and is connected to the backwashing pipeline 16. The backwashing pipeline 16 is provided with a backwashing water inlet valve 17, and the backwashing water inlet valve 17 is connected to the control unit 26 for controlling the backwashing process.

[0064] The entire cleaning system is powered by a cleaning pump 4, which introduces water into the cleaning tank 2 through a water inlet line 10, and a cleaning agent or disinfectant may be added through a dosing line 12. After cleaning is completed, the system needs to be backwashed to remove sediment or residue to ensure the cleanliness and efficient operation of the system.

[0065] The backwash line 16 is a pipeline connecting the cleaning tank 2 and other parts that need to be cleaned or flushed. Its main function is to flush away impurities deposited on the pipeline, filter or other equipment through reverse flowing water after the cleaning process is completed.

[0066] The backwash inlet valve 17 is installed on the backwash line 16 and is a key component for controlling the backwash water flow. Its main function is to control the entry and stop of the backwash water flow by opening or closing the valve. This ensures that the backwash process can be started when needed and stopped in time after completion. The backwash inlet valve is connected to the control unit 26, which automatically controls the opening and closing of the backwash inlet valve according to a preset program, thereby realizing the automatic control of the backwash process.

[0067] In summary, the backwash inlet valve 17 on the backwash line 16 is connected to the control unit 26, and together they realize precise control of the backwash process, which not only improves the efficiency and effect of the cleaning system, but also ensures the stability and reliability of the system.

[0068] Preferably, Figure 1 As shown, a water inlet valve 18 is fixedly installed on the water inlet pipeline 10 between the dosing pipeline 12 and the backwashing pipeline 16 , and the water inlet valve 18 is connected to the control unit 26 .

[0069] An inlet valve 18 is installed on the water inlet pipeline between the dosing pipeline 12 and the backwashing pipeline 16. The control unit 26 can control the opening and closing of the inlet valve 18 to adjust the water flow.

[0070] Dosing line 12 is used to add cleaning agents, disinfectants or other chemicals to the water flow so as to play a specific role in the cleaning process. The dosing line is usually connected to the water inlet line to ensure that the chemicals can be evenly dispersed in the water.

[0071] As mentioned above, the backwash line 16 is used to flush away impurities deposited on pipes, filters or other equipment by reverse-flowing water after the cleaning process is completed.

[0072] The water inlet pipeline 10 is responsible for delivering water to various parts of the system to ensure that the cleaning process can proceed smoothly. The water inlet valve 18 is installed on the water inlet pipeline, especially in the part between the dosing line 12 and the backwashing line 16. The main function of the water inlet valve is to control the entry and stop of water flow and adjust the flow rate of water flow. The connection and control of the water inlet valve 18 and the control unit 26 enable the control unit to monitor the status of the water inlet valve in real time and send control signals as needed. The control unit 26 can automatically control the opening and closing of the water inlet valve 18 according to the preset cleaning program. For example, in the dosing stage, the control unit can open the water inlet valve to allow water to flow into the cleaning tank through the dosing line; in the backwashing stage, the control unit can close or adjust the water inlet valve to control the intensity and direction of the water flow.

[0073] The present invention injects the cleaning agent into the system through the dosing pump 3. The selection of the cleaning agent can be adjusted according to the properties of the dirt on the surface of the filter element. For example, by using existing well-known cleaning technologies such as composite acid, the cleaning agent can penetrate and dissolve the dirt molecules on the surface of the filter element, achieving efficient chemical cleaning and ensuring that the dirt is fully removed.

[0074] In summary, the water inlet valve 18 fixedly installed on the water inlet pipeline 10 between the dosing pipeline 12 and the backwashing pipeline 16 realizes precise control of the water flow direction and flexible adjustment of the flow rate through connection and control with the control unit 26. This not only improves the efficiency and effect of the cleaning system, but also ensures the stability and reliability of the system.

[0075] Preferably, Figure 1 As shown, a plurality of water caps 22 are provided at the inner bottom of the cleaning box 2 and / or a plurality of nozzles 23 evenly distributed at upper and lower intervals are provided between the water inlet pipeline 10 and one side of the cleaning box 2, the inlet of the nozzle 23 is fixedly connected to the water inlet pipeline 10, and the outlet of the nozzle 23 is fixedly connected to the inside of the cleaning box 2.

[0076] To ensure that the water flows evenly into the cleaning box 2. The design of the cleaning box 2 includes two structures, a water cap 22 and a nozzle 23, both of which are to ensure that the water flows evenly into the cleaning box and effectively cleans. You can choose one of them, or use them together for better results.

[0077] The water cap 22 is usually arranged at the inner bottom of the cleaning box 2. Their main function is to serve as an outlet for the water flow and evenly distribute the water flow to all corners of the cleaning box. The design of the water cap usually includes one or more small holes, which can ensure that the water flow flows out evenly with less pressure loss.

[0078] How it works: When water flows into the cleaning tank through the water inlet line, it first flows through the pipe or chamber under the water cap. The water then flows out evenly through the small holes in the water cap, forming a uniform water film covering the bottom of the cleaning tank. This design helps ensure that all areas within the cleaning tank are adequately cleaned.

[0079] The nozzle 23 is arranged between the water inlet line 10 and one side of the cleaning box 2, and is evenly spaced up and down. This design can ensure that the water flow can form multiple injection points when entering the cleaning box, thereby increasing the coverage area of ​​the water flow and the cleaning effect. The nozzle 23 usually has a narrow outlet, which can make the water flow obtain a higher speed when passing through, thereby forming a spray effect. When the water flows through the nozzle, it will be sprayed into the interior of the cleaning box at a certain angle and speed. This spray effect not only helps to increase the coverage of the water flow, but also improves the efficiency and effect of cleaning.

[0080] Working principle: The water in the water inlet line 10 enters the nozzle through the inlet of the nozzle 23, and then is ejected at a high speed and pressure at the outlet of the nozzle. These ejected water flows will cover all areas in the cleaning box, thereby ensuring that the cleaning process can be carried out comprehensively and evenly.

[0081] By combining the water cap 22 and the nozzle 23, the design of the cleaning box 2 can ensure that the water flow can enter and cover the entire cleaning box evenly and comprehensively. This design not only improves the efficiency and effect of cleaning, but also helps to reduce energy consumption and costs during the cleaning process. At the same time, since the water flow can be evenly distributed to every corner of the cleaning box, the stability and consistency of the cleaning quality can also be ensured.

[0082] In general, the designs of the water cap 22 and the nozzle 23 are all for optimizing the water flow distribution and the cleaning effect in the cleaning box 2. They achieve uniform distribution of water flow and efficient cleaning in different ways, thereby improving the performance and efficiency of the entire cleaning system.

[0083] Preferably, Figure 1 As shown, the fixing device is used to fix the filter element, and the fixing device includes a water inlet channel 24 and a plurality of fixed pipelines 25. Both ends of the water inlet channel 24 are fixedly connected to the inner wall of the bottom of the cleaning box 2 and are connected to the backwashing pipeline 16. The upper end of the water inlet channel 24 is connected to the cleaning box 2 through the fixed pipelines 25 fixed at intervals on the left and right. The upper inner side of the fixed pipeline 25 is provided with an internal thread for positioning and fixing the filter element.

[0084] The fixing device of the present invention is used to stably install the filter element, and the device is mainly composed of a water inlet channel 24 and a plurality of fixing pipelines 25, which work together to ensure the stable and efficient operation of the filter element in the cleaning box 2. The water inlet channel 24 is cleverly arranged at the bottom of the cleaning box 2, and its two ends are firmly fixed to the inner wall of the bottom of the cleaning box 2. This design ensures the stability of the water inlet channel 24, and also provides a reliable inlet for the backwash water flow.

[0085] The fixed pipelines 25 are fixed to the upper end of the water inlet channel 24 in a left-right interval manner and are connected to the inside of the cleaning box 2. These pipelines form a complex and orderly water flow network in the cleaning box 2, providing necessary conditions for the fixing and cleaning of the filter element.

[0086] The inner side of the upper part of the fixed pipeline 25 is cleverly designed with internal threads. This design not only enhances the structural strength of the pipeline, but also facilitates the installation of the filter element. The filter element can be firmly positioned and fixed by closely fitting with the internal threads, thereby avoiding the shaking or falling off that may occur during the cleaning process. The fixed pipeline 25 not only serves as a supporting structure for the filter element, but also bears the important task of guiding the backwashing water flow through the filter element. When the backwashing water flow enters the cleaning box 2 through the water inlet channel 24, it will flow through the filter element along the channel of the fixed pipeline 25, thereby achieving effective cleaning of the filter element.

[0087] At the same time, since the fixed pipeline 25 adopts an internal thread connection method, it is also convenient for the installation, removal and replacement of the filter element, which provides great convenience for the daily maintenance and care of the cleaning system.

[0088] Preferably, Figure 1 As shown, the forward wash return valve 19, the lower drain valve 20, the exhaust valve 21, the upper drain valve 15, the backwash inlet valve 17, and the inlet valve 18 are configured as solenoid valves.

[0089] The solenoid valve is a device that uses electromagnetic force to control the flow of fluid, and has the advantages of compact structure, rapid action, and easy control. In the present invention, the solenoid valve is used to control the on / off and direction of the water flow, thereby achieving precise control of the cleaning process.

[0090] The intermediate relay is an electrical control element used to transmit and amplify signals in a control circuit. In the present invention, the intermediate relay receives a signal from a control unit (PLC) and converts it into a current or voltage signal that can drive the solenoid valve to work. Through the control of the intermediate relay, the solenoid valve can be remotely, automatically and accurately controlled.

[0091] After the solenoid valve receives the driving signal from the intermediate relay, the electromagnet inside it will generate magnetic force to attract or release the valve core, thereby changing the opening and closing state of the valve. In this process, the solenoid valve achieves precise control of the fluid.

[0092] In actual use, by reasonably setting the program of the control unit and the connection relationship of the intermediate relay, accurate control of each solenoid valve can be achieved. For example, during the forward washing process, the forward washing return valve 19 and the water inlet valve 18 can be opened, and other valves can be closed; during the backwashing process, the backwash water inlet valve 17 and the lower drain valve 20 can be opened, and other valves can be closed. Through such a control strategy, the cleaning process can be ensured to proceed smoothly and the expected cleaning effect can be achieved.

[0093] To sum up, realizing automatic control by the principle of controlling the solenoid valve through an intermediate relay is an efficient, reliable and flexible control method.

[0094] A method for off-line cleaning of a filter in a DC converter valve cooling water system comprises the following steps:

[0095] Step 1, first cycle positive wash;

[0096] Connect the external water source to the water inlet pipeline 10 of the cleaning pump 4, open the water inlet valve 18 and the exhaust valve 21, start the cleaning pump 4 to inject water into the cleaning tank 2, when the exhaust pipeline 7 starts to drain, close the exhaust valve 21 and stop injecting water, open the lower drain valve 20, start the first positive wash, after the water in the lower drain pipeline 9 becomes clear, close the lower drain valve 20, open the positive wash return valve 19, start the cyclic positive wash process, and the cleaning water circulates through the cleaning pump 4 through the positive return pipeline 8 and returns to the cleaning tank 2;

[0097] Step 2, physical and chemical cleaning;

[0098] During the cycle cleaning process, the control unit 26 starts the ultrasonic oscillator 5 and the heater 6. When the cleaning liquid reaches the set temperature threshold, the control unit 26 starts the dosing pump 3, injects the cleaning agent into the water inlet pipeline 10 through the dosing pipeline 12, and fully mixes it with water through the pipeline mixer 13. When the dosing amount reaches the set value, the dosing pump is stopped. This step performs chemical and physical cleaning at the same time;

[0099] Step 3, washing the filter element;

[0100] After the filter element is cleaned, the control unit 26 stops the cleaning pump 4, closes the water inlet valve 18 and the positive wash return valve 19, opens the lower drain valve 20 and the exhaust valve 21, and discharges the waste liquid. After the waste liquid is drained, the lower drain valve 20 is closed, the water inlet valve 18 and the exhaust valve 21 are opened, and the control unit 26 starts the cleaning pump 4 to check whether the exhaust line 7 has water. If so, the exhaust valve 21 is closed, and the lower drain valve 20 is opened to discharge the cleaning water through the lower drain line 9, thereby completing the positive wash of the filter element;

[0101] Step 4, backwashing the filter element;

[0102] When the water discharged by the forward washing pump 4 becomes clear, the backwash inlet valve 17 and the upper drain valve 15 are opened, and the lower drain valve 20 is closed to start the upper backwash. When the water is clear, the upper drain valve 15 is closed and the lower drain valve 20 is opened to start the lower backwash. When the water is clear, the washing pump 4 is stopped, the backwash inlet valve 17 is closed, and the lower drain valve 20 is closed to end the backwash.

[0103] Step 5, water washing;

[0104] Finally, open the water inlet valve 18 and the forward wash return valve 19, close the backwash water inlet valve 17, start the cleaning pump 4, inject water into the cleaning tank 2, drain the water through the forward return pipeline 8 until it becomes clear, stop the cleaning pump 4, close the water inlet valve 18 and the forward wash return valve 19, and complete the final water flushing.

[0105] As attached Figure 1 As shown, the offline cleaning device for the filter of the DC converter valve cooling water system of the present invention further optimizes the cleaning process to achieve an efficient and thorough cleaning effect. The following is a description of the configuration of each component and the cleaning steps of the present invention:

[0106] The device comprises a box body 1 and a control unit 26, and the control unit 26 is installed outside the box body 1. A cleaning box 2, a dosing pump 3 and a cleaning pump 4 are arranged inside the box body 1. An ultrasonic oscillator 5 and a filter element fixing device are installed inside the cleaning box 2, a heater 6 is fixed on the outer wall, and the cleaning box 2 is connected to the outside through an exhaust pipeline 7 at the top. An exhaust valve 21 is arranged on the exhaust pipeline 7 to control gas discharge.

[0107] To achieve efficient drainage, the lower drainage line 9 of the cleaning box 2 is fixedly connected to the upper drainage line 14, and an upper drainage valve 15 is installed on the upper drainage line 14. The valve is opened and closed by the control unit 26 to discharge waste water during the cleaning process.

[0108] The water inlet pipeline 10 between the cleaning pump 4 and the dosing pipeline 12 is fixedly connected to the bottom of the cleaning tank 2 and connected to the cleaning tank 2 through the backwashing pipeline 16. A backwashing water inlet valve 17 is installed on the backwashing pipeline 16 to control the inlet and outlet of the backwashing water.

[0109] In addition, a water inlet valve 18 is installed on the water inlet pipeline between the dosing pipeline 12 and the backwashing pipeline 16, and the control unit 26 can control the opening and closing of the water inlet valve 18 to adjust the water flow. A plurality of water caps 22 are arranged on the inner side of the bottom of the cleaning tank 2 to intercept impurities generated during the flushing process. A plurality of nozzles 23 spaced up and down are arranged between the water inlet pipeline 10 and one side of the cleaning tank 2 to ensure that the water flows into the cleaning tank 2 evenly.

[0110] The filter element fixing device is composed of a water inlet channel 24 and a plurality of fixed pipelines 25. Both ends of the water inlet channel 24 are fixedly connected to the bottom of the cleaning box 2 and communicated with the backwash pipeline 16. The upper part of the fixed pipeline 25 is provided with an internal thread, which can be threadedly connected to the filter element to ensure stability.

[0111] like Figures 2 to 7 As shown, the cleaning process is as follows:

[0112] 1. First cycle forward wash: connect the external water source to the water inlet pipeline 27 of the cleaning pump 4, open the water inlet valve 18 and the exhaust valve 21, and start the cleaning pump 4 to inject water into the cleaning tank 2. When the exhaust pipeline 7 starts to drain, close the exhaust valve 21 and stop injecting water, open the lower drain valve 20, and start the first forward wash. When the water in the lower drain pipeline 9 becomes clear, close the lower drain valve 20, open the forward wash return valve 19, and start the cycle forward wash process. The washing water circulates through the forward return pipeline 8, flows through the cleaning pump 4, and returns to the cleaning tank 2.

[0113] 2. Physical and chemical cleaning: During the cycle cleaning process, the control unit 26 starts the ultrasonic oscillator 5 and the heater 6. When the cleaning liquid reaches the set temperature threshold, the control unit 26 starts the dosing pump 3, injects the cleaning agent into the water inlet pipeline 10 through the dosing pipeline 12, and fully mixes it with water through the pipeline mixer 13. This step performs chemical and physical cleaning at the same time, and the dosing amount is determined according to the volume of the cleaning tank 2 and the dirt situation.

[0114] 3. Forward washing of the filter element: After the filter element is cleaned, the control unit 26 stops the cleaning pump 4, closes the water inlet valve 18 and the forward washing return valve 19, opens the lower drain valve 20 and the exhaust valve 21, and discharges the waste liquid. After the waste liquid is drained, the lower drain valve 20 is closed, the water inlet valve 18 and the exhaust valve 21 are opened, and the control unit 26 starts the cleaning pump 4 to check whether the exhaust pipeline 7 has water flowing out. If so, the exhaust valve 21 is closed, and the lower drain valve 20 is opened to discharge the cleaning water through the lower drain pipeline 9, thereby completing the forward washing of the filter element.

[0115] 4. Backwash filter element: When the water discharged by the forward washing pump 4 becomes clear, open the backwash inlet valve 17 and the upper drain valve 15, close the lower drain valve 20, and start the upper backwash. When the water is clear, close the upper drain valve 15 and open the lower drain valve 20 to start the lower backwash, and end the backwash until the water is clear.

[0116] 5. Water flushing: Finally, open the water inlet valve 18 and the forward wash return valve 19, close the backwash inlet valve 17, start the cleaning pump 4, inject water into the cleaning tank 2, drain the water through the forward return pipeline 8, complete the final water flushing, ensure that the water is drained cleanly, and the cleaning process is completed.

[0117] The above design realizes an efficient filter element cleaning process by accurately controlling each component through the control unit 26. The present invention has strong adaptability, and non-essential technical features can be adjusted according to actual needs to meet different cleaning requirements.

[0118] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the field without departing from the purpose of the present invention. These changes involve related technologies well known to those skilled in the art, which all fall within the scope of protection of the patent of the present invention.

[0119] Many other changes and modifications may be made without departing from the concept and scope of the present invention.It should be understood that the present invention is not limited to the specific embodiments, and the scope of the present invention is defined by the appended claims.

Claims

1. An off-line cleaning device for a filter in a DC converter valve cooling water system, characterized in that: It comprises a box (1) and a control unit (26), wherein the control unit (26) is installed outside the box (1), and a cleaning box (2), a dosing pump (3) and a cleaning pump (4) are arranged inside the box (1); An ultrasonic oscillator (5), a filter element, and a fixing device are arranged inside the cleaning box (2); a heater (6) is arranged on the outer wall of the cleaning box (2); the top of the cleaning box (2) is connected to the outside through an exhaust pipeline (7) fixedly connected thereto; and an exhaust valve (21) is installed on the exhaust pipeline (7); The inlet of the cleaning pump (4) is introduced into an external water source through an external water inlet pipeline (10) fixedly connected thereto, one end of the external water inlet pipeline (10) is located outside the box body (1), and the other end thereof is connected to the cleaning pump (4), the inlet of the cleaning pump (4) is also connected to the bottom of the cleaning box (2) through a positive return water pipeline (8) and a lower drainage pipeline (9), a positive return water valve (19) is provided in the positive return water pipeline (8), a lower drainage valve (20) is installed on the lower drainage pipeline (9), and the outlet of the cleaning pump (4) is fixedly connected to the cleaning box (2) through the water inlet pipeline (10); The inlet of the dosing pump (3) is connected to an external medicine supply device via a dosing pipeline (11), the other end of the dosing pipeline (11) is located outside the box (1), the outlet of the dosing pump (3) is fixedly connected to a water inlet pipeline (10) via a dosing pipeline (12), and a pipeline mixer (13) is provided on the water inlet pipeline (10) between the dosing pipeline (12) and the cleaning box (2); The cleaning pump (4), the dosing pump (3), the positive wash return valve (19), the lower drain valve (20), the exhaust valve (21), the ultrasonic oscillator (5) and the heater (6) are all connected to the control unit (26).

2. The off-line cleaning device for the filter of the DC converter valve cooling water system according to claim 1 is characterized in that: The control unit (26) comprises an electrically connected power module and a control module, wherein the power module is electrically connected to a cleaning pump (4), a dosing pump (3), an ultrasonic oscillator (5) and a heater (6), and the control module comprises an intermediate relay, wherein the intermediate relay is provided with a plurality of contacts, and the forward wash return valve (19), the lower drain valve (20) and the exhaust valve (21) are electrically connected to the intermediate relay via different contacts.

3. The off-line cleaning device for the filter of the DC converter valve cooling water system according to claim 2 is characterized in that: An upper drainage pipeline (14) is fixedly connected between the upper part of the cleaning box (2) and the lower drainage pipeline (9), and an upper drainage valve (15) is provided on the upper drainage pipeline (14), and the upper drainage valve (15) is connected to the control unit (26).

4. The off-line cleaning device for the filter of the DC converter valve cooling water system according to claim 3 is characterized in that: The water inlet pipeline (10) between the cleaning pump (4) and the dosing pipeline (12) is extended to the bottom of the cleaning tank (2) through a fixed connection, and is connected to the backwashing pipeline (16). The backwashing pipeline (16) is provided with a backwashing water inlet valve (17), and the backwashing water inlet valve (17) is connected to a control unit (26) for controlling the backwashing process.

5. The off-line cleaning device for the filter of the DC converter valve cooling water system according to claim 4 is characterized in that: A water inlet valve (18) is fixedly installed on the water inlet pipeline (10) between the dosing pipeline (12) and the backwashing pipeline (16), and the water inlet valve (18) is connected to the control unit (26).

6. The off-line cleaning device for the filter of the DC converter valve cooling water system according to any one of claims 1 to 5, characterized in that: The inner bottom of the cleaning box (2) is provided with a plurality of water caps (22) and / or a plurality of nozzles (23) evenly spaced up and down are provided between the water inlet pipeline (10) and one side of the cleaning box (2), the inlet of the nozzle (23) is fixedly connected to the water inlet pipeline (10), and the outlet of the nozzle (23) is fixedly connected to the inside of the cleaning box (2).

7. The off-line cleaning device for the filter of the DC converter valve cooling water system according to claim 6 is characterized in that: The fixing device is used to fix the filter element, and the fixing device comprises a water inlet channel (24) and a plurality of fixed pipelines (25). The two ends of the water inlet channel (24) are fixedly connected to the inner wall of the bottom of the cleaning box (2) and are communicated with the backwashing pipeline (16). The upper end of the water inlet channel (24) is communicated with the cleaning box (2) through the fixed pipelines (25) fixed at intervals on the left and right. The upper inner side of the fixed pipeline (25) is provided with an internal thread for positioning and fixing the filter element.

8. The off-line cleaning device for the filter of the DC converter valve cooling water system according to claim 7 is characterized in that: The forward wash return valve (19), the lower drain valve (20), the exhaust valve (21), the upper drain valve (15), the backwash inlet valve (17), and the inlet valve (18) are configured as solenoid valves.

9. A method for off-line cleaning of filters in a DC converter valve cooling water system, characterized in that: The offline cleaning device for the filter of the DC converter valve cooling water system according to any one of claims 1 to 8 is used to perform the following steps: Step 1, first cycle positive wash; Connect an external water source to the water inlet pipeline (10) of the cleaning pump (4), open the water inlet valve (18) and the exhaust valve (21), start the cleaning pump (4) to inject water into the cleaning tank (2), when the exhaust pipeline (7) starts to drain water, close the exhaust valve (21) and stop injecting water, open the lower drain valve (20), start the first positive wash, after the water in the lower drain pipeline (9) becomes clear, close the lower drain valve (20), open the positive wash return valve (19), start the cyclic positive wash process, and the cleaning water circulates through the cleaning pump (4) through the positive return pipeline (8) and returns to the cleaning tank (2); Step 2, physical and chemical cleaning; During the cycle cleaning process, the control unit (26) starts the ultrasonic oscillator (5) and the heater (6). When the cleaning liquid reaches a set temperature threshold, the control unit (26) starts the dosing pump (3), injects the cleaning agent into the water inlet pipeline (10) through the dosing pipeline (12), and fully mixes it with water through the pipeline mixer (13). When the dosing amount reaches the set value, the dosing pump is stopped. This step performs chemical and physical cleaning at the same time; Step 3, washing the filter element; After the filter element is cleaned, the control unit (26) stops the cleaning pump (4), closes the water inlet valve (18) and the normal wash return valve (19), opens the lower drain valve (20) and the exhaust valve (21), and discharges the waste liquid. After the waste liquid is drained, the lower drain valve (20) is closed, the water inlet valve (18) and the exhaust valve (21) are opened, and the control unit (26) starts the cleaning pump (4) to check whether water is discharged from the exhaust pipeline (7). If so, the exhaust valve (21) is closed, and the lower drain valve (20) is opened to discharge the cleaning water through the lower drain pipeline (9), thereby completing the normal wash of the filter element. Step 4, backwashing the filter element; When the water discharged by the forward washing cleaning pump (4) becomes clear, the backwashing water inlet valve (17) and the upper drainage valve (15) are opened, and the lower drainage valve (20) is closed to start the upper backwashing. When the water is clear, the upper drainage valve (15) is closed and the lower drainage valve (20) is opened to start the lower backwashing. When the water is clear, the cleaning pump (4) is stopped, the backwashing water inlet valve (17) is closed, and the lower drainage valve (20) is closed to end the backwashing. Step 5, water washing; Finally, open the water inlet valve (18) and the forward wash return valve (19), close the backwash water inlet valve (17), start the cleaning pump (4), inject water into the cleaning tank (2), drain the water through the forward return pipeline (8) until it becomes clear, stop the cleaning pump (4), close the water inlet valve (18) and the forward wash return valve (19), and complete the final water flushing.

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