Pickling passivation process and pickling passivation device for cooler cover water collecting pipe

Abstract

The invention relates to the technical field of water collecting pipe surface treatment, in particular to a cooler cover water collecting pipe pickling and passivating process and a pickling and passivating device. The corrosion resistance of the water collecting pipe is improved and the service life of the water collecting pipe is prolonged by matching the six steps of water washing, acid pickling, water washing, passivation, deionized water washing and blow-drying and combining the specific operation of each cleaning step and the structure and function of the device. Under the action of the passivation solution, the cooler cover water collecting pipe generates a layer of thin and compact passivation film which is good in coverage and can be firmly attached to the metal surface on the metal surface, and the passivation film can separate the metal from a corrosion medium and plays a role in preventing a pipeline from secondary oxidation and rusting. The device is simple in structure, easy to maintain and high in practicability.

Description

Technical Field

[0001] The invention relates to the technical field of water collecting pipe surface treatment, in particular to a pickling and passivation process and a pickling and passivation device for a cooler cover water collecting pipe. Background Art

[0002] When the generator is working, the temperature of the internal iron core and stator coil rises. In order to prevent the coil from being overheated and damaged and the aging of the insulation material affecting the service life of the generator, cooling measures must be taken to remove the heat generated by the coil and iron core in time.

[0003] The cooler cover manifold is used to collect cooling water. The cooling water is collected from the excitation end of the generator into the manifold. The cooling water flows through the manifold to the inside of the stator coil, thereby taking away the heat generated by the loss of the generator stator coil. However, impurities such as oil, welding, rust, and dust generated by welding of the manifold before leaving the factory will also affect the cooling effect of the generator. The traditional cleaning mode often manually disassembles the manifold pipes to be cleaned and soaks them in a cleaning tank. The highly corrosive pickling passivation liquid in the tank splashes and can easily injure operators. Not only that, considering the cost of reagents and the size of the tank space, the traditional cleaning device cannot completely immerse large and long pipes, resulting in inadequate cleaning of the pipes and unsatisfactory cleaning effects. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a cooler cover water pipe pickling and passivation process and a pickling and passivation device, the purpose of which is to passivate the inner wall of the water pipe to form a dense passivation film, thereby improving the corrosion resistance and service life of the water pipe.

[0005] In order to achieve the above object, the present invention provides a cooler cover manifold pickling passivation process, comprising the following steps: Step S1: water washing; Inject water into the water collection pipe and flush the water collection pipe with the flowing water; Step S2: pickling; Inject the pickling liquid into the water collection pipe to wash away the oil stains and rust remaining on the inner wall of the water collection pipe; Step S3: water washing; Inject water into the water collection pipe, flush the water collection pipe with the flowing water, and remove the acid wash liquid remaining on the inner wall of the water collection pipe; Step S4: passivation; The passivation liquid is injected into the water collection pipe, and the passivation liquid performs passivation treatment on the inner wall of the water collection pipe to form a passivation film; Step S5: washing with deionized water; Inject deionized water into the water collection pipe, and use the flowing deionized water to flush and remove the passivation liquid remaining on the inner wall of the water collection pipe; Step S6: drying; Blow compressed air into the manifold to dry it.

[0006] The pickling and passivation process of the cooler cover manifold includes six steps: water washing, pickling, water washing, passivation, deionized water washing, and blow drying. Water washing means injecting water into the manifold, and washing the manifold with flowing water to remove rust scattered on the inner wall of the manifold or attached to the surface, as well as impurities dissolved in water, so as to provide more ideal basic conditions for subsequent pickling, passivation and other treatments; pickling means injecting pickling liquid such as nitric acid solution into the manifold, and washing the oil stains and rust remaining on the inner wall of the manifold with nitric acid solution to achieve a deeper and more comprehensive cleaning effect; water washing means injecting water into the manifold, and washing the manifold with flowing water to remove the pickling liquid remaining on the inner wall of the manifold, so as to facilitate subsequent passivation treatment. ; Passivation is to inject passivation liquid into the water collection pipe, and the passivation liquid passivates the inner wall of the water collection pipe to generate a thin, dense, well-covered passivation film that can firmly adhere to the metal surface, thereby improving the corrosion resistance and service life of the water collection pipe; deionized water washing is to inject deionized water into the water collection pipe, and the residual passivation liquid on the inner wall of the water collection pipe is removed by flowing deionized water to prevent the introduction of foreign impurities and gradually improve the cleanliness of the water collection pipe; drying is to blow compressed gas into the water collection pipe to dry the water collection pipe to prevent the pipe from oxidizing in a humid environment.

[0007] Furthermore, the water collection pipe includes a ring-shaped first water collection pipe; the first water collection pipe has a water inlet and a water outlet; the pickling passivation liquid flows into the first water collection pipe from the water inlet, and the pickling passivation liquid entering the first water collection pipe is diverted to various parts of the pipeline at the water inlet; the pickling passivation liquid diverted in the first water collection pipe converges to the water outlet, and the pickling passivation liquid flows out from the water outlet of the first water collection pipe.

[0008] Furthermore, the water collection pipe also includes an arc-shaped second water collection pipe; the second water collection pipe has a water inlet and a water outlet; the pickling passivation liquid flows into various parts of the pipeline from the water inlets at both ends of the second water collection pipe; the pickling passivation liquid flowing into the water inlets at both ends of the second water collection pipe converges at the water outlet, and the pickling passivation liquid flows out from the water outlet of the second water collection pipe.

[0009] Furthermore, the first water collection pipe and the second water collection pipe are respectively provided with a water inlet and a water outlet, and the pickling and passivation processes of the first water collection pipe and the second water collection pipe do not affect each other; the pickling and passivation liquid flows into the first water collection pipe from the water inlet and then flows out from the water outlet, and the pickling and passivation liquid flowing out from the water outlet circulates into the first water collection pipe from the water inlet; the pickling and passivation liquid flows into the second water collection pipe from the water inlet and then flows out from the water outlet, and the pickling and passivation liquid flowing out from the water outlet circulates into the second water collection pipe from the water inlet.

[0010] The above process is realized by pickling and passivation device: Furthermore, the cooler cover includes a cover body; a circular through hole is provided in the center of the cover body, and a first water collection pipe is provided along the edge of the through hole; the first water collection pipe is provided with a water inlet and a water outlet; a cooler cover water collection pipe pickling and passivation process and a pickling and passivation device include a first working pump, a first pickling and passivation tank, a first deionized water tank, a first liquid inlet pipe and a first reflux pipe; a pipe is connected between the inlet end of the first working pump and the first pickling and passivation tank; a pipe is connected between the inlet end of the first working pump and the first deionized water tank; the first liquid inlet pipe is connected between the outlet end of the first working pump and the water inlet of the first water collection pipe; the first reflux pipe is connected between the water outlet of the first water collection pipe and the first pickling and passivation tank.

[0011] The first pickling and passivation tank is filled with pickling and passivation liquid, which is used to clean the oil, welding, rust, dust and other impurities on the inner wall of the cooler cover manifold; the first deionized water tank is filled with deionized water, which is used to flush the passivation liquid remaining on the inner wall of the pipe to prevent the introduction of foreign impurities. When cleaning the manifold, the pickling and passivation liquid or deionized water flows through the pipe to the first working pump, and then enters the first manifold through the first liquid inlet pipe under the pressure of the pump. After the pipe is cleaned, the pickling and passivation liquid or deionized water flows back to the first pickling and passivation tank from the first return pipe. This device does not need to immerse the pipe in the cleaning tank, which not only effectively solves the problem of large and long pipes that cannot be completely immersed in the cleaning tank, but also avoids direct contact between operators and highly corrosive pickling and passivation liquid, reducing the safety risks of operators.

[0012] Furthermore, a cooler cover manifold pickling and passivation process and a pickling and passivation device include a first control valve and a second control valve; the inlet end of the first working pump has a junction; the inlet end of the first working pump is connected to the first pickling and passivation tank by a liquid supply pipe; a first control valve is provided on the liquid supply pipe; the inlet end of the first working pump is connected to the first deionized water tank by a water supply pipe; a second control valve is provided on the water supply pipe; the liquid supply pipe and the water supply pipe are connected to the junction.

[0013] Furthermore, an exhaust pipe is provided on the upper portion of the first water collecting pipe, and an exhaust valve is provided on the exhaust pipe.

[0014] Furthermore, there are a plurality of exhaust valves on the first water collecting pipe; adjacent exhaust valves are distributed at an angle of 85 to 95 degrees.

[0015] Furthermore, a flange interface is provided at the water outlet of the first water collecting pipe; and the first return pipe flange is connected to the flange interface.

[0016] Furthermore, the first pickling and passivation tank is an open tank; the first deionized water tank is a closed tank.

[0017] Furthermore, a second water collection pipe is provided along the edge of the through hole, and the second water collection pipe is located next to the first water collection pipe; the second water collection pipe is provided with a water inlet and a water outlet; a cooler cover water collection pipe pickling and passivation process and a pickling and passivation device also include a second working pump, a second pickling and passivation tank, a second deionized water tank, a second liquid inlet pipe and a second reflux pipe; a pipe is connected between the inlet end of the second working pump and the second pickling and passivation tank; a pipe is connected between the inlet end of the second working pump and the second deionized water tank; a second liquid inlet pipe is connected between the outlet end of the second working pump and the water inlet of the second water collection pipe; and a second reflux pipe is connected between the water outlet of the second water collection pipe and the second pickling and passivation tank.

[0018] Furthermore, a cooler cover manifold pickling and passivation process and a pickling and passivation device include a third control valve and a fourth control valve; the inlet end of the second working pump has a junction; the inlet end of the second working pump is connected to the second pickling and passivation tank by a liquid supply pipe; the third control valve is provided on the liquid supply pipe; the inlet end of the second working pump is connected to the second deionized water tank by a water supply pipe; the fourth control valve is provided on the water supply pipe; the liquid supply pipe and the water supply pipe are connected to the junction.

[0019] Furthermore, a tee is provided at the outlet end of the second liquid inlet pipe, the tee having a pair of liquid inlets, one of which is connected to the water inlet at one end of the second water collecting pipe with liquid inlet branch pipe 1; the other liquid inlet is connected to the water inlet at the other end of the second water collecting pipe with liquid inlet branch pipe 2; and a water outlet is provided in the middle of the second water collecting pipe.

[0020] Furthermore, a plurality of flanges are provided on the outer wall of the cover body; the first liquid inlet pipe comprises an inner liquid inlet pipe and an outer liquid inlet pipe; the inner liquid inlet pipe is arranged inside the cover body, and the outer liquid inlet pipe is arranged outside the cover body; the inner liquid inlet pipe and the outer liquid inlet pipe are connected to the outer wall of the cover body through flanges; the second return pipe comprises an inner return pipe and an outer return pipe; the inner return pipe is arranged inside the cover body, and the outer return pipe is arranged outside the cover body; the inner return pipe and the outer return pipe are connected to the outer wall of the cover body through flanges.

[0021] Beneficial Effects The present invention performs pickling passivation on the cooler cover water collection pipe. Under the action of the passivation liquid, a dense passivation film is formed on the metal surface of the water collection pipe. The passivation film can separate the metal from the corrosive medium and prevent the pipeline from secondary oxidation and rusting, thereby improving the corrosion resistance and service life of the water collection pipe.

[0022] The first water collection pipe and the second water collection pipe of the present invention are two independent pipes and circulate for cleaning. Not only can the flow rate of the pickling passivation liquid be adjusted in real time according to the pipe diameter to achieve all-round cleaning of the inner wall of the pipe, but the pipe to be cleaned can also be selected as needed, effectively shortening the cleaning time of the pipe.

[0023] The pickling and passivation device of the present invention does not need to immerse the pipeline in a cleaning tank, which not only effectively solves the problem that large and long pipelines cannot be completely immersed in the cleaning tank, but also avoids direct contact between operators and highly corrosive pickling and passivation liquid, thereby reducing the safety risks of operators. The device has a simple structure, is easy to maintain, and is highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the connection between the cooler cover water collection pipe pickling passivation device and the cooler cover; Figure 2 This is a schematic diagram of the structure of the cooler cover manifold pickling and passivation device; Figure 3 It is a schematic diagram of the structure of the pickling and passivation device of the first water collection pipe; Figure 4 It is a schematic diagram of the structure of the pickling and passivation device of the second water collection pipe; Figure 5 It is a schematic diagram of the installation of the first control valve and the second control valve; Figure 6 This is a schematic diagram of the installation of the third control valve and the fourth control valve; Figure 7 It is a schematic diagram of the structure of the exhaust valve; Figure 8 It is a structural schematic diagram of the flange interface; Fig. 9 This is an exploded diagram of the connection between the tee pipe and other pipes; Fig.10 It is a schematic diagram of the structure of the flange.

[0025] In the accompanying drawings: 11, cover; 111, through hole; 12, first water collection pipe; 13, second water collection pipe; 21, first working pump; 22, second working pump; 31, first pickling and passivation tank; 32, second pickling and passivation tank; 41, first deionized water tank; 42, second deionized water tank; 51, first liquid inlet pipe; 511, inner liquid inlet pipe; 512, outer liquid inlet pipe; 52, second liquid inlet pipe; 521, inlet Liquid branch pipe one; 522, liquid inlet branch pipe two; 53, liquid supply pipe; 54, water supply pipe; 61, first reflux pipe; 62, second reflux pipe; 621, inner reflux pipe; 622, outer reflux pipe; 71, first control valve; 72, second control valve; 73, third control valve; 74, fourth control valve; 75, exhaust valve; 81, tee pipe; 811, liquid inlet; 91, flange interface; 92, flange. DETAILED DESCRIPTION

[0026] Embodiments of the present invention are described in detail below. The embodiments described below are illustrative and intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0027] Cooler cover water pipe pickling device like Figure 1 , Figure 2 and Figure 3 As shown, the cooler cover includes a cover body 11; a circular through hole 111 is provided in the center of the cover body 11, and a first water collection pipe 12 is provided along the edge of the through hole 111; the first water collection pipe 12 is provided with a water inlet and a water outlet; a cooler cover water collection pipe pickling passivation process and a pickling passivation device include a first working pump 21, a first pickling passivation tank 31, a first deionized water tank 41, a first liquid inlet pipe 51 and a first reflux pipe 61; a pipe is connected between the inlet end of the first working pump 21 and the first pickling passivation tank 31; a pipe is connected between the inlet end of the first working pump 21 and the first deionized water tank 41; the first liquid inlet pipe 51 is connected between the outlet end of the first working pump 21 and the water inlet of the first water collection pipe 12; and the first reflux pipe 61 is connected between the water outlet of the first water collection pipe 12 and the first pickling passivation tank 31.

[0028] The first pickling and passivation tank 31 is filled with pickling and passivation liquid, which is used to clean the oil, welding, rust, dust and other impurities on the inner wall of the cooler cover water pipe; the first deionized water tank 41 is filled with deionized water, which is used to flush the passivation liquid remaining on the inner wall of the pipe to prevent the introduction of foreign impurities. When cleaning the water pipe, the pickling and passivation liquid or deionized water flows to the first working pump 21 through the pipe, and then enters the first water pipe 12 from the first liquid inlet pipe 51 under the pressure of the pump. After the pipeline is cleaned, the pickling and passivation liquid or deionized water flows back to the first pickling and passivation tank 31 from the first return pipe 61. The device does not need to immerse the pipeline in the cleaning tank, which not only effectively solves the scene limitation problem that large and long pipelines cannot be completely immersed in the cleaning tank, but also avoids direct contact between operators and highly corrosive pickling and passivation liquid, reducing the safety risk of operators.

[0029] like Figure 5 As shown, a cooler cover water pipe pickling passivation process and a pickling passivation device include a first control valve 71 and a second control valve 72; the inlet end of the first working pump 21 has a junction; the inlet end of the first working pump 21 and the first pickling passivation tank 31 are connected to a liquid supply pipe 53; the first control valve 71 is provided on the liquid supply pipe 53; the inlet end of the first working pump 21 and the first deionized water tank 41 are connected to a water supply pipe 54; the second control valve 72 is provided on the water supply pipe 54; the liquid supply pipe 53 and the water supply pipe 54 are connected to the junction.

[0030] The control valve is used to control the inflow and outflow of pickling passivation liquid and deionized water. When the pickling passivation liquid is needed for pipeline cleaning, the first control valve 71 is opened and the second control valve 72 is closed, and the pickling passivation liquid flows out from the first pickling passivation tank 31 to the first water collection pipe 12, and the impurities on the inner wall of the pipeline are taken away by the flowing liquid; when the deionized water is needed for pipeline cleaning, the first control valve 71 is closed and the second control valve 72 is opened, and the deionized water flows out from the first deionized water tank 41 to the first water collection pipe 12, and the residual passivation liquid is taken away by the flowing deionized water. During the cleaning process of the first water collection pipe 12, different cleaning liquids can be switched by switching the switches of the first control valve 71 and the second control valve 72, and the cleaning process is simple and convenient.

[0031] like Figure 7 As shown, an exhaust pipe is provided on the upper portion of the first water collecting pipe 12, and an exhaust valve 75 is provided on the exhaust pipe.

[0032] Since the density of gas is less than that of liquid, the accumulated air in the first water collection pipe 12 will float to the upper part of the pipe. The exhaust valve 75 provided at the upper part of the pipe can effectively remove the air in the pipe, reduce the water flow resistance in the first water collection pipe 12 and protect the pipe from deformation and rupture. Moreover, when the first water collection pipe 12 is cleaned, the exhaust valve 75 is opened to remove the air in the pipe and then the valve is immediately closed, which can ensure that the cleaning liquid can fill the entire water collection pipe, so that every corner of the pipe can be cleaned.

[0033] like Figure 7 As shown, there are a plurality of exhaust valves 75 on the first water collecting pipe 12; adjacent exhaust valves 75 are distributed at an angle of 85 to 95 degrees.

[0034] Two exhaust valves 75 adjacent to each other at a specific angle are provided to discharge the accumulated gas at various locations on the first water collection pipe 12, ensuring that the gas at various locations on the first water collection pipe 12 can be completely discharged without affecting the operation of the pipeline.

[0035] like Figure 8 As shown, a flange interface 91 is provided at the water outlet of the first water collecting pipe 12 ; the first return pipe 61 is flange-connected to the flange interface 91 .

[0036] After the water collection pipe is cleaned, the pickling passivation loop is removed, and compressed gas is introduced into the flange interface 91 to dry the pipe of the first water collection pipe 12 to prevent the pipe from being oxidized again in a humid environment.

[0037] like Figure 3 As shown, the first pickling and passivation tank 31 is an open tank; the first deionized water tank 41 is a closed tank.

[0038] The first pickling and passivation tank 31 is set as an open tank, which is convenient for real-time monitoring of the concentration of the pickling and passivation solution in the first reflux pipe 61 during the cleaning process, and the process is monitored in real time. The closed deionized water tank can isolate dust and other impurities outside the tank from flying into the tank, ensuring that the deionized water is clean and pollution-free.

[0039] like Fig.10 As shown, the outer wall of the cover body 11 is provided with a plurality of flanges 92; the first liquid inlet pipe 51 includes an inner liquid inlet pipe 511 and an outer liquid inlet pipe 512; the inner liquid inlet pipe 511 is provided inside the cover body 11, and the outer liquid inlet pipe 512 is provided outside the cover body 11; the inner liquid inlet pipe 511 and the outer liquid inlet pipe 512 are connected to the outer wall of the cover body 11 through the flange 92; The flange 92 connects the pipes inside and outside the housing 11, so that the cleaning liquid can flow smoothly in the pipes without leakage, thereby ensuring that the water collection pipe can be cleaned normally.

[0040] like Figure 1 , Figure 2 and Figure 4 As shown, the cooler cover includes a cover body 11; a circular through hole 111 is provided in the center of the cover body 11, and a second water collection pipe 13 is also provided along the edge of the through hole 111, and the second water collection pipe 13 is located next to the first water collection pipe 12; the second water collection pipe 13 is provided with a water inlet and a water outlet; a cooler cover water collection pipe pickling and passivation process and a pickling and passivation device also include a second working pump 22, a second pickling and passivation tank 32, a second deionized water tank 42, a second liquid inlet pipe 52 and a second reflux pipe 62; a pipe is connected between the inlet end of the second working pump 22 and the second pickling and passivation tank 32; a pipe is connected between the inlet end of the second working pump 22 and the second deionized water tank 42; a second liquid inlet pipe 52 is connected between the outlet end of the second working pump 22 and the water inlet of the second water collection pipe 13; a second reflux pipe 62 is connected between the water outlet of the second water collection pipe 13 and the second pickling and passivation tank 32.

[0041] The second pickling and passivation tank 32 is filled with pickling and passivation liquid, which is used to clean the oil, welding, rust, dust and other impurities on the inner wall of the cooler cover water pipe. The second deionized water tank 42 is filled with deionized water, which is used to flush the passivation liquid remaining on the inner wall of the pipe to prevent the introduction of foreign impurities. When cleaning the second water pipe 13 pipeline, the pickling and passivation liquid or deionized water flows to the second working pump 22 through the pipeline, and then enters the second water pipe 13 from the second liquid inlet pipe 52 under the pressure of the pump. After the pipeline is cleaned, the pickling and passivation liquid or deionized water flows back to the second pickling and passivation tank 32 from the second return pipe 62. The device does not need to immerse the pipeline in the cleaning tank, which not only effectively solves the scene limitation problem that large and long pipelines cannot be completely immersed in the cleaning tank, but also avoids direct contact between operators and highly corrosive pickling and passivation liquid, reducing the safety risk of operators.

[0042] like Figure 6As shown, a cooler cover water pipe pickling and passivation process and a pickling and passivation device include a third control valve 73 and a fourth control valve 74; the inlet end of the second working pump 22 has a junction joint; the inlet end of the second working pump 22 and the second pickling and passivation tank 32 are connected to a liquid supply pipe 53; the third control valve 73 is provided on the liquid supply pipe 53; the inlet end of the second working pump 22 and the second deionized water tank 42 are connected to a water supply pipe 54; the fourth control valve 74 is provided on the water supply pipe 54; the liquid supply pipe 53 and the water supply pipe 54 are connected to the junction joint.

[0043] The control valve is used to control the inflow and outflow of the pickling passivation liquid and the deionized water. When the pickling passivation liquid is needed for pipeline cleaning, the third control valve 73 is opened, the fourth control valve 74 is closed, and the pickling passivation liquid flows out from the second pickling passivation tank 32 to the second water collection pipe 13, and the impurities on the inner wall of the pipeline are taken away by the flowing liquid; when the deionized water is needed for pipeline cleaning, the third control valve 73 is closed, the fourth control valve 74 is opened, and the deionized water flows out from the second deionized water tank 42 to the second water collection pipe 13, and the residual passivation liquid is taken away by the flowing deionized water. During the cleaning process of the second water collection pipe 13, different cleaning liquids can be switched by switching the switches of the third control valve 73 and the fourth control valve 74, and the cleaning process is simple and convenient.

[0044] like Fig. 9 As shown, a three-way pipe 81 is provided at the outlet end of the second liquid inlet pipe 52, and the three-way pipe 81 has a pair of liquid inlets 811, one of which is connected to the water inlet at one end of the second water collection pipe 13 through the liquid inlet branch pipe 1 521; the other liquid inlet 811 is connected to the water inlet at the other end of the second water collection pipe 13 through the liquid inlet branch pipe 2 522; and a water outlet is provided in the middle of the second water collection pipe 13.

[0045] The pickling passivation liquid or deionized water enters from both ends of the second water collecting pipe 13 and then flows out from the middle of the pipe, so that no dead corners are left during cleaning and the inner wall of the pipe is cleaned more comprehensively.

[0046] like Fig.10 As shown, a plurality of flanges 92 are provided on the outer wall of the cover body 11; the second return pipe 62 includes an inner return pipe 621 and an outer return pipe 622; the inner return pipe 621 is provided inside the cover body 11, and the outer return pipe 622 is provided outside the cover body 11; the inner return pipe 621 and the outer return pipe 622 are connected to the outer wall of the cover body 11 through the flange 92.

[0047] The flange 92 connects the pipes inside and outside the housing 11, so that the cleaning liquid can flow smoothly in the pipes without leakage, thereby ensuring that the water collection pipe can be cleaned normally.

[0048] Pickling and passivation of cooler cover manifold The pickling and passivation of the first water collecting pipe 12 is carried out according to the following steps: Step S1.1: Water rinse The first water collection pipe 12 is cleaned with water to preliminarily remove insoluble impurities on the inner wall of the pipe. This process provides more ideal basic conditions for subsequent pickling, water washing, passivation and other treatments, which is beneficial to improving the effect and quality of the pickling and passivation process of the cooler cover water collection pipe.

[0049] Water is injected into the first pickling and passivation tank 31, the first control valve 71 is opened, and the second control valve 72 is closed. Water flows out of the first pickling and passivation tank 31, and flows to the first water collection pipe 12 after being pressurized by the first working pump 21. The flowing water removes some impurities in the pipeline through the first reflux pipe 61 back to the first pickling and passivation tank 31.

[0050] Step S1.2: Pickling After the initial water cleaning, impurities such as oxides, oil stains, and rust remain on the first water collection pipe 12. The use of nitric acid solution can effectively clean impurities such as black oxides caused by welding on the inner wall of the pipe. This is because the hydrogen ions in the nitric acid solution can react with the oxides on the surface of the pipe and reduce them to metal surfaces. These impurities dissolve and fall off under the action of the nitric acid solution, and then flow back into the first pickling passivation tank 31. Under the cleaning action of the nitric acid solution, the first water collection pipe 12 has a deeper and more comprehensive cleaning effect. The cleaned inner wall of the pipe can better accept subsequent passivation and other treatments to ensure the orderliness and continuity of these processes.

[0051] After the water flushing is completed, the water in the first pickling and passivation tank 31 is drained, the nitric acid solution is injected, the first control valve 71 is opened, and the second control valve 72 is closed. The nitric acid solution flows out of the first pickling and passivation tank 31, and flows to the first water collection pipe 12 after being pressurized by the first working pump 21. The nitric acid solution flows the impurities in the pipeline back to the first pickling and passivation tank 31 through the first reflux pipe 61, and the cleaning is continuously circulated.

[0052] Step S1.3: Water rinse After pickling, there is still a small amount of acidic substances left on the inner wall of the pipe. If these acidic substances are not completely removed, they will cause certain corrosion in the pipe, affecting the corrosion resistance and service life of the water collection pipe, and will also affect subsequent use. Therefore, it is necessary to rinse the remaining nitric acid solution in the pipe with water.

[0053] After pickling, the pickling liquid in the first pickling passivation tank 31 is drained in time, and then the water to be flushed is injected. The first control valve 71 is opened, and the second control valve 72 is closed. Water flows out of the first pickling passivation tank 31, and flows to the first water collection pipe 12 after being pressurized by the first working pump 21. The flowing water takes away the residual acid in the pipeline and flows back to the first pickling passivation tank 31 through the first reflux pipe 61, and the nitric acid solution concentration in the first reflux pipe 61 is cleaned until it is close to zero.

[0054] Step S1.4: Passivation The first water collection pipe 12 is passivated by using a passivation liquid. Under the action of the passivation liquid, a very thin, dense, well-covered, and firmly attached passivation film is formed on the metal surface of the water collection pipe. This passivation film can separate the metal from the corrosive medium and prevent the secondary oxidation and rusting of the pipe, thereby improving the corrosion resistance and service life of the water collection pipe.

[0055] After the water flushing is completed, the water in the first pickling passivation tank 31 is drained, and then the passivation liquid is injected. The first control valve 71 is opened, and the second control valve 72 is closed. The passivation liquid flows out of the first pickling passivation tank 31, and flows to the first water collection pipe 12 after being pressurized by the first working pump 21. The passivation liquid forms a dense passivation film on the metal surface in the pipeline. The passivation liquid is continuously circulated and passivated in the pipeline until the concentration of the dense passivation film formed just meets the process requirements. The excess passivation liquid flows back to the first pickling passivation tank 31 from the first reflux pipe 61. The concentration of the exhaust port of the first water collection pipe 12 is monitored during the passivation process, and the exhaust valve 75 is opened regularly to exhaust in time. After the pickling passivation is completed, the cleaning quality of the first water collection pipe 12 can be detected by the blue dot test. If the surface passivation film is imperfect or contaminated by iron ions, the free iron ions react with potassium ferrocyanide to form a dark blue compound.

[0056] Step S1.5: Deionized water cleaning After passivation, the manifold needs to be thoroughly cleaned with deionized water to remove the residual passivation liquid on the inner wall of the pipe. Deionized water cleaning can not only make the pipe more silvery and shiny, but also prevent the introduction of foreign impurities, gradually improve the cleanliness of the manifold, and achieve a deeper and more comprehensive cleaning effect.

[0057] The passivation liquid in the first pickling passivation tank 31 is drained in time, and deionized water is injected into the first deionized water tank 41. The first control valve 71 is closed, and the second control valve 72 is opened. Deionized water flows out of the first deionized water tank 41, and flows to the first water collection pipe 12 after being pressurized by the first working pump 21. The deionized water washes the passivation liquid remaining in the pipeline and then flows back to the first pickling passivation tank 31 through the first reflux pipe 61, and is washed until the passivation liquid concentration in the first reflux pipe 61 is close to zero.

[0058] Step S1.6: Blow Dry After the water collection pipe is pickled and passivated, compressed gas is introduced to dry the pipe to prevent the pipe from oxidizing in a humid environment. The gas blown in can be helium, nitrogen and other gases.

[0059] After the first water collecting pipe 12 is flushed with deionized water, the first return pipe 61 is removed, and compressed gas is blown into the pipe from the water outlet of the first water collecting pipe 12 to prevent the pipe from being oxidized in a humid environment.

[0060] The pickling and passivation of the second water collecting pipe 13 is carried out according to the following steps: Step S2.1: Water flushing The second water collection pipe 13 is cleaned with water to preliminarily remove insoluble impurities on the inner wall of the pipe. This process provides more ideal basic conditions for subsequent pickling, water washing, passivation and other process treatments, which is beneficial to improving the effect and quality of the pickling and passivation process treatment of the cooler cover water collection pipe.

[0061] Water is injected into the second pickling and passivation tank 32, the third control valve 73 is opened, and the fourth control valve 74 is closed. Water flows out of the second pickling and passivation tank 32, and flows to the second water collection pipe 13 after being pressurized by the second working pump 22. The flowing water brings some impurities in the pipeline back to the second pickling and passivation tank 32 through the second reflux pipe 62.

[0062] Step S2.2: Pickling After the preliminary water cleaning, impurities such as oxides, oil stains, and rust still remain on the second water collection pipe 13. The use of nitric acid solution can effectively clean impurities such as black oxides caused by welding on the inner wall of the pipe. This is because the hydrogen ions in the nitric acid solution can react with the oxides on the surface of the pipe and reduce them to metal surfaces. These impurities dissolve and fall off under the action of the nitric acid solution, and then flow back into the second pickling passivation tank 32. Under the cleaning action of the nitric acid solution, the cleaning effect of the second water collection pipe 13 is deeper and more comprehensive. The cleaned inner wall of the pipe can better accept subsequent passivation and other treatments to ensure the orderliness and continuity of these processes.

[0063] After the water flushing is completed, the water in the second pickling and passivation tank 32 is drained, and then the nitric acid solution is injected. The third control valve 73 is opened, and the fourth control valve 74 is closed. The nitric acid solution flows out of the second pickling and passivation tank 32, and flows to the second water collection pipe 13 after being pressurized by the second working pump 22. The nitric acid solution flows the oxides caused by welding in the pipeline back to the second pickling and passivation tank 32 through the second reflux pipe 62, and the cleaning is continuously circulated.

[0064] Step S2.3: Water rinse After pickling, there is still a small amount of acidic substances left on the inner wall of the pipe. If these acidic substances are not completely removed, they will cause certain corrosion in the pipe, affecting the corrosion resistance and service life of the water collection pipe, and will also affect the subsequent use. Therefore, it is necessary to clean the nitric acid solution remaining in the pipe with water.

[0065] After pickling is completed, the pickling liquid in the second pickling and passivation tank 32 is drained, the water to be flushed is injected, the third control valve 73 is opened, and the fourth control valve 74 is closed. Water flows out of the second pickling and passivation tank 32, and flows to the second water collection pipe 13 after being pressurized by the second working pump 22. The flowing water neutralizes the residual acid in the pipeline and then flows back to the second pickling and passivation tank 32 through the second reflux pipe 62, and is cleaned until the concentration of the nitric acid solution in the second reflux pipe 62 is close to zero.

[0066] Step S2.4: Passivation The second water collection pipe 13 is passivated by using a passivation liquid. Under the action of the passivation liquid, a very thin, dense, well-covered, and firmly attached passivation film is formed on the metal surface of the water collection pipe. This passivation film can separate the metal from the corrosive medium and prevent the secondary oxidation and rusting of the pipe, thereby improving the corrosion resistance and service life of the water collection pipe.

[0067] After the water flushing is completed, the water in the second pickling and passivation tank 31 is drained, the passivation liquid is injected, the third control valve 73 is opened, the fourth control valve 74 is closed, the passivation liquid flows out of the second pickling and passivation tank 32, and flows to the second water collection pipe 13 after being pressurized by the second working pump 22. The passivation liquid forms a dense passivation film on the metal surface in the pipeline. The passivation liquid is continuously circulated and passivated in the pipeline until the concentration of the dense passivation film formed just meets the process requirements. The excess passivation liquid flows back to the second pickling and passivation tank 32 through the second return pipe 62. After the pickling and passivation are completed, the cleaning quality of the second water collection pipe 13 can be detected by the blue dot test. If the surface passivation film is imperfect or contaminated by iron ions, the free iron ions react with potassium ferrocyanide to form a dark blue compound.

[0068] Step S2.5: Deionized water washing After passivation, the manifold needs to be thoroughly cleaned with deionized water to remove the residual passivation liquid on the inner wall of the pipe. Deionized water cleaning can not only make the pipe more silvery and shiny, but also prevent the introduction of foreign impurities, gradually improve the cleanliness of the manifold, and achieve a deeper and more comprehensive cleaning effect.

[0069] The passivation liquid in the second pickling passivation tank 32 is drained, and deionized water is injected into the second deionized water tank 42. The third control valve 73 is closed, and the fourth control valve 74 is opened. Deionized water flows out of the second deionized water tank 32, and flows to the second water collection pipe 13 after being pressurized by the second working pump 22. The deionized water washes the passivation liquid remaining in the pipeline and then flows back to the second pickling passivation tank 32 through the second return pipe 62, and washes until the concentration of the passivation liquid in the second return pipe 62 is close to zero.

[0070] Step S2.6: Blow Dry After the water collection pipe is pickled and passivated, compressed gas is introduced to dry the pipe to prevent the pipe from oxidizing in a humid environment. The gas blown in can be helium, nitrogen and other gases.

[0071] After the second water collecting pipe 13 is flushed with deionized water, the second return pipe 62 is removed, and compressed gas is blown into the pipe from the water outlet of the second water collecting pipe 13 to prevent the pipe from being oxidized in a humid environment.

Claims

1. A cooler cover water pipe pickling passivation process, characterized in that: The water collection pipe pickling and passivation process comprises the following steps: Step S1: water washing; Pour water into the water collection pipe and flush the water collection pipe with the flowing water; Step S2: pickling; Inject the pickling liquid into the water collection pipe to wash away the oil stains and rust remaining on the inner wall of the water collection pipe; Step S3: water washing; Inject water into the water collection pipe, flush the water collection pipe with the flowing water, and remove the acid wash liquid remaining on the inner wall of the water collection pipe; Step S4: passivation; The passivation liquid is injected into the water collection pipe, and the passivation liquid performs passivation treatment on the inner wall of the water collection pipe to form a passivation film; Step S5: washing with deionized water; Inject deionized water into the water collection pipe, and use the flowing deionized water to flush and remove the passivation liquid remaining on the inner wall of the water collection pipe; Step S6: drying; Blow compressed air into the manifold to dry it.

2. A cooler cover manifold pickling and passivation process according to claim 1, characterized in that: The water collection pipe comprises a first water collection pipe (12) in an annular shape; the first water collection pipe (12) has a water inlet and a water outlet; the pickling and passivation liquid flows into the first water collection pipe (12) from the water inlet, and the pickling and passivation liquid entering the first water collection pipe (12) is divided from the water inlet to various parts of the pipeline; the pickling and passivation liquid divided in the first water collection pipe (12) converges to the water outlet, and the pickling and passivation liquid flows out from the water outlet of the first water collection pipe (12).

3. A cooler cover manifold pickling and passivation process according to claim 2, characterized in that: The water collection pipe further comprises an arc-shaped second water collection pipe (13); the second water collection pipe (13) has a water inlet and a water outlet; the pickling passivation liquid flows into various places of the pipeline from the water inlets at both ends of the second water collection pipe (13); the pickling passivation liquid flowing in from the water inlets at both ends of the second water collection pipe (13) converges at the water outlet, and the pickling passivation liquid flows out from the water outlet of the second water collection pipe (13).

4. A cooler cover manifold pickling and passivation process according to claim 3, characterized in that: The first water collection pipe (12) and the second water collection pipe (13) are each provided with a water inlet and a water outlet, and the pickling and passivation processes of the first water collection pipe (12) and the second water collection pipe (13) do not affect each other; the pickling and passivation liquid flows into the first water collection pipe (12) from the water inlet and then flows out from the water outlet, and the pickling and passivation liquid flowing out from the water outlet circulates from the water inlet into the first water collection pipe (12); the pickling and passivation liquid flows into the second water collection pipe (13) from the water inlet and then flows out from the water outlet, and the pickling and passivation liquid flowing out from the water outlet circulates from the water inlet into the second water collection pipe (13).

5. A cooler cover manifold pickling and passivation device, characterized in that: The cooler cover comprises a cover body (11); a circular through hole (111) is provided in the center of the cover body (11); a first water collection pipe (12) is provided along the edge of the through hole (111); the first water collection pipe (12) is provided with a water inlet and a water outlet; the cooler cover water collection pipe pickling passivation process and pickling passivation device comprises a first working pump (21), a first pickling passivation tank (31), a first deionized water tank (41), a first liquid inlet pipe (51) and a first return pipe (61); a pipe is connected between the inlet end of the first working pump (21) and the first pickling passivation tank (31); a pipe is connected between the inlet end of the first working pump (21) and the first deionized water tank (41); the first liquid inlet pipe (51) is connected between the outlet end of the first working pump (21) and the water inlet of the first water collection pipe (12); and the first return pipe (61) is connected between the water outlet of the first water collection pipe (12) and the first pickling passivation tank (31).

6. A cooler cover manifold pickling and passivation device according to claim 5, characterized in that: The invention comprises a first control valve (71) and a second control valve (72); the inlet end of the first working pump (21) has a junction; a liquid supply pipe (53) is connected between the inlet end of the first working pump (21) and a first pickling passivation tank (31); the liquid supply pipe (53) is provided with a first control valve (71); a water supply pipe (54) is connected between the inlet end of the first working pump (21) and a first deionized water tank (41); the water supply pipe (54) is provided with a second control valve (72); the liquid supply pipe (53) and the water supply pipe (54) are connected to the junction.

7. A cooler cover manifold pickling and passivation device according to claim 5, characterized in that: A flange interface (91) is provided at the water outlet of the first water collecting pipe (12); the first return pipe (61) is flange-connected to the flange interface (91).

8. A cooler cover manifold pickling and passivation device according to claim 5, characterized in that: A second water collection pipe (13) is also provided along the edge of the through hole (111), and the second water collection pipe (13) is located beside the first water collection pipe (12); the second water collection pipe (13) is provided with a water inlet and a water outlet; the cooler cover water collection pipe pickling and passivation process and pickling and passivation device also include a second working pump (22), a second pickling and passivation tank (32), a second deionized water tank (42), a second liquid inlet pipe (52) and a second return pipe (62); a pipe is connected between the inlet end of the second working pump (22) and the second pickling and passivation tank (32); a pipe is connected between the inlet end of the second working pump (22) and the second deionized water tank (42); a second liquid inlet pipe (52) is connected between the outlet end of the second working pump (22) and the water inlet of the second water collection pipe (13); and a second return pipe (62) is connected between the water outlet of the second water collection pipe (13) and the second pickling and passivation tank (32).

9. A cooler cover manifold pickling and passivation device according to claim 8, characterized in that: The invention comprises a third control valve (73) and a fourth control valve (74); the inlet end of the second working pump (22) has a junction; a liquid supply pipe (53) is connected between the inlet end of the second working pump (22) and the second pickling passivation tank (32); the third control valve (73) is arranged on the liquid supply pipe (53); the inlet end of the second working pump (22) and the second deionized water tank (42) is connected to a water supply pipe (54); the fourth control valve (74) is arranged on the water supply pipe (54); the liquid supply pipe (53) and the water supply pipe (54) are connected to the junction.

10. A cooler cover manifold pickling and passivation process and pickling and passivation device according to claim 8, characterized in that: The outlet end of the second liquid inlet pipe (52) is provided with a three-way pipe (81), the three-way pipe (81) having a pair of liquid inlets (811), one of the liquid inlets (811) and the first liquid inlet branch pipe (521) being connected to the water inlet at one end of the second water collecting pipe (13); the other liquid inlet (811) and the second liquid inlet branch pipe (522) being connected to the water inlet at the other end of the second water collecting pipe (13); and a water outlet is provided in the middle of the second water collecting pipe (13).

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