Liquid storage device and manufacturing method of liquid storage device

Abstract

The liquid storage device comprises a device body and a connecting piece, the connecting piece is connected with the device body in a welded mode, the connecting piece comprises a connecting part, the device body comprises a matching part, the connecting part and the matching part are connected in a matched and welded mode, and the matched and welded portion of the connecting part and the matching part is defined as a matched and welded portion. The liquid storage device comprises the chromium-free passivation layer, and the chromium-free passivation layer at least further covers the outer surface of the matched welding part, so that the corrosion resistance of the welding part is improved, and the corrosion resistance of the liquid storage device is further improved.

Description

[Technical field]

[0001] The invention relates to the field of refrigeration, and in particular to a liquid storage device and a method for manufacturing the liquid storage device. [Background technology]

[0002] In recent years, the corrosion resistance requirements of liquid reservoirs have become increasingly higher, and the corrosion resistance of welding parts is relatively low. In related technologies, hexavalent chromium passivation treatment is usually performed on the welding parts and surfaces of the liquid reservoirs to improve the overall corrosion resistance of the liquid reservoirs. However, in the process of chromium passivation, harmful substances such as chromium will be produced, which will be harmful to the human body and affect the environmental protection. [Summary of the invention]

[0003] The object of the present invention is to provide a corrosion-resistant liquid reservoir and a method for manufacturing the liquid reservoir that does not produce harmful chromium. The present invention adopts the following technical solutions:

[0004] The present invention also provides a liquid reservoir, comprising a body and a connecting piece, wherein the connecting piece is welded to the body, the connecting piece comprises a connecting portion, and the body comprises a matching portion, the connecting portion and the matching portion are connected by matching welding, and the matching welding portion between the connecting portion and the matching portion is defined as a matching welding portion, and the liquid reservoir comprises a chromium-free passivation layer, and the chromium-free passivation layer at least covers the outer surface of the matching welding portion.

[0005] The liquid reservoir provided by the present invention has a chromium-free passivation layer that at least passivates the surface of the mating welding part of the liquid reservoir, slows down the corrosion rate of the welding part, improves the corrosion resistance of the welding part, further improves the overall corrosion resistance of the liquid reservoir, and does not produce substances harmful to the human body and the environment.

[0006] The present invention also provides a method for manufacturing a liquid reservoir, the method for manufacturing a liquid reservoir comprising at least the following steps:

[0007] Welding step: providing a connector and a body, assembling and welding the body and the connector to obtain a liquid storage device blank, and defining a matching welding portion between the body and the connector as a matching welding portion;

[0008] Passivation process treatment: using a chromium-free passivation solution to perform a passivation treatment on at least the matching weld portion, so as to generate a chromium-free passivation layer covering at least the outer surface of the matching weld portion.

[0009] The liquid reservoir manufacturing method provided by the present invention performs passivation treatment on the matching welding parts of the liquid reservoir, which slows down the corrosion rate of the welding parts of the liquid reservoir, improves the corrosion resistance of the liquid reservoir, and does not produce substances harmful to the human body and the environment.

Brief Description of the Drawings

[0010] Figure 1is a front view of the pipeline assembly provided by the present invention;

[0011] Figure 2 yes Figure 1 A cross-sectional view of the AA section of the pipe assembly shown;

[0012] Figure 3 yes Figure 2 A BB section view of the pipe assembly shown;

[0013] Figure 4 yes Figure 2 A CC section cutaway view of the piping assembly shown;

[0014] Figure 5 yes Figure 2 A partial enlarged view of position D of the pipeline assembly shown;

[0015] Figure 6 is a three-dimensional diagram of a liquid storage device provided by the present invention;

[0016] Figure 7 yes Figure 6 A top view of the reservoir is shown;

[0017] Figure 8 yes Figure 6 E, E section cutaway view of the reservoir shown;

[0018] Fig. 9 yes Figure 8 A partial enlarged view of point F of the liquid reservoir is shown.

[0019] Reference numerals:

[0020] 100, liquid storage device; 1, body; 3, connector; 33, connection part; 13, matching part; 21, first pipe fitting; 22, second pipe fitting; 23, third pipe fitting; 11, main body; 211, first connection part; 212, second connection part; 12, first matching part; 110, chromium-free passivation layer; 2100, first base part; 2200, second base part; 2, pipeline assembly; 221, first joint part; 222, second joint part; 4, connection assembly; 41, adapter; 14, opening; 411, third connection part; 141, third matching part; 510, third base part; 51, fourth connection part; 15, fourth matching part; 5, mounting bracket; 120, outer layer; 231, third joint part; [Specific implementation method]

[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0022] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. The directional words such as upper and lower involved in this article are defined by the relative positions of the components shown in the drawings. In order to make the technical solution clear and convenient, it should be understood that the directional words used in this article should not be Restrictions The scope of protection sought in the application.

[0023] In recent years, the corrosion resistance requirements of parts in refrigeration systems have become increasingly higher. For example, aluminum liquid reservoirs are easily ionized, that is, easily corroded. In addition, the conditions of the use environment are becoming increasingly harsh, such as some humid marine environments, some acidic environments, and the standards for acidic 2000-hour salt spray tests. The corrosion resistance requirements for refrigeration system parts are even higher. In addition, welding processes are mostly used when connecting pipes in refrigeration systems, and the corrosion resistance of welding parts will be relatively low. Therefore, it is imperative to improve the corrosion resistance of welding parts and parts as a whole. In the related art, hexavalent chromium passivation treatment is usually performed on the surface of the liquid reservoir to improve the corrosion resistance of the liquid reservoir. However, in the process of chromium passivation, substances that are harmful to the human body and the environment will be produced. In order to solve the above problems, the present application provides a liquid reservoir with strong corrosion resistance and harmless to the human body and the environment, and a method for manufacturing the liquid reservoir.

[0024] See also Figures 1 to 9 The present application provides a liquid reservoir 100, including a body 1 and a connector 3, the connector 3 is welded to the body 1, the connector 3 includes a connecting portion 33, the body 1 includes a matching portion 13, the connecting portion 33 and the matching portion 13 are connected by matching welding, and the matching welding portion between the connecting portion 33 and the matching portion 13 is defined as a matching welding portion, the liquid reservoir 100 includes a chromium-free passivation layer 110, and the chromium-free passivation layer 110 at least covers the outer surface of the matching welding portion. The corrosion resistance of the mating welding part on the liquid reservoir 100 is relatively weak compared with other parts. In order to improve the overall corrosion resistance of the liquid reservoir 100, at least the mating welding part of the liquid reservoir 100 is covered with a chromium-free passivation layer 110 to improve the corrosion resistance. The chromium-free passivation layer 110 is a passivation film produced on the metal surface through a passivation process. The chromium-free passivation layer 110 can slow down the corrosion rate of the surface of the second mating welding part, thereby improving the overall corrosion resistance of the liquid reservoir 100. In addition, in the process of generating the chromium-free passivation layer 110, no substances harmful to the human body and the environment will be produced.

[0025] It is hereby explained that the present application mentions that the passivation process refers to a method of forming a passivation film on the metal surface by a chemical oxidation method, so that the metal surface is converted into a state that is not easily oxidized, thereby slowing down the corrosion rate of the metal; the chromium-free passivation solution used in the passivation process is a colorless and transparent liquid, composed of zirconium and silicon main salts, film-forming promoters, stabilizers, and pH regulators. It does not contain heavy metal chromium, lead, cadmium, and other harmful organic matter, and is an environmentally friendly product. Specially used for treating the corrosion resistance of aluminum and alloy aluminum and galvanized products Corrosion and oxidation resistance treatment, which can be used for spraying or dipping, can provide Excellent The passivation film weight generally refers to the weight of the passivation film on 1 square meter of the metal surface; the aluminum point refers to the weight of aluminum contained in each liter of chromium-free passivation solution.

[0026] See also Figure 1-Figure 7 The present application provides a connector 3 which can be a pipeline assembly 2, which at least includes a first pipe fitting 21, which is welded to the device body 1, and the first pipe fitting 21 includes a first connecting portion 211, and the device body 1 includes a first matching portion 12 matching the first connecting portion 211, and the device body 1 and the first pipe fitting 21 are connected by matching welding of the first connecting portion 211 and the first matching portion 12, and the matching welding portion of the first connecting portion 211 and the first matching portion 12 is defined as a first matching welding portion, and the chromium-free passivation layer 110 at least covers the outer surface of the first matching welding portion. By covering the first matching welding portion of the pipeline assembly 2 with the chromium-free passivation layer 110, the corrosion resistance of the pipeline assembly 2 is improved, and the corrosion rate of the welding portion of the liquid reservoir 100 is slowed down, thereby improving the overall corrosion resistance of the liquid reservoir.

[0027] Further, the pipeline assembly 2 also includes a second pipe fitting 22, the second pipe fitting 22 includes a first joint portion 221, the first pipe fitting 21 includes a second connection portion 212, the first joint portion 221 is welded to the second connection portion 212, and the first joint portion 221 and the second connection portion 212 are welded to define the second welding portion as the second welding portion, and the chromium-free passivation layer 110 covers at least the outer surface of the second welding portion. In this way, the chromium-free passivation layer 110 is generated on the surface of the second welding portion through the passivation process, and the chromium-free passivation layer 110 can slow down the corrosion speed of the surface of the second welding portion, improve the corrosion resistance of the second welding portion, and thus improve the overall corrosion resistance of the liquid reservoir 100. In addition, in the process of generating the chromium-free passivation layer, no chromium, a substance harmful to the human body, is generated.

[0028] In order to further improve the overall corrosion resistance of the liquid reservoir 100, the surfaces of other parts of the liquid reservoir 100 except for the matching welding parts can be subjected to chromium-free passivation treatment to produce a chromium-free passivation layer 110. Specifically, the parts not involved in the welding connection are defined as the substrate or the main body. The body 1 includes the main body 11, and the first pipe 21 includes the first substrate 2100. The chromium-free passivation layer 110 at least covers the outer surface of the main body 11 and / or the first substrate 2100. This can slow down the corrosion rate of the first substrate 2100 and the main body 11, improve the corrosion resistance of the first substrate 2100 and the main body 11, and thus improve the overall corrosion resistance of the liquid reservoir 100. Furthermore, the second pipe 22 also includes a second substrate 2200. The chromium-free passivation layer 110 at least covers the first substrate 2100 and / or the second substrate 2200. This can To slow down one The base part 2100 and the second base The corrosion rate of the body 2200 increases The corrosion resistance of the first base portion 2100 and the second base portion 2200 is improved, thereby improving the corrosion resistance of the pipeline assembly 2 and further improving the overall corrosion resistance of the liquid reservoir 100.

[0029] See also Figure 6-7 The present application provides that the connector 3 may also be a connecting component 4, which is arranged on the side wall of the device body 1. The connecting component 4 may be a sight glass component, a fusible plug component, etc. The connecting component 4 includes an adapter seat 41. The material of the adapter seat 41 is the same as that of the device body 1, and both may be made of aluminum. The adapter seat 41 and the device body 1 can be welded together by argon arc welding, laser welding, brazing, etc. The device body 1 includes an opening portion 14, and the opening portion 14 is arranged on the side wall of the device body 1. The adapter seat 41 is welded and connected with the opening portion 14 arranged on the side wall of the device body 1. The adapter seat 41 includes a third connecting portion 411, and the opening portion 14 includes a third matching portion 141. The third connecting portion 411 and the third matching portion 141 are welded and connected. The matching connection portion between the third connecting portion 411 and the third matching portion 141 is defined as a third matching welding portion, and the chromium-free passivation layer 110 at least covers the outer surface of the third matching welding portion. In this way, by providing a chromium-free passivation layer 110 at the welding part of the connecting component 4 and the body 1, the corrosion rate of the welding part of the liquid reservoir 100 is slowed down, the overall corrosion resistance of the liquid reservoir is improved, and the connection strength of the welding part is also improved.

[0030] See also Figure 6-7 The liquid reservoir 100 can be installed on the system bracket, or a self-contained bracket that better matches its own structure can be used to improve installation reliability. The connecting member 3 can also be a mounting bracket 5 of the liquid reservoir 100, such as Figure 6As shown, this embodiment provides a self-contained bracket of a liquid reservoir 100, and the liquid reservoir 100 also includes a mounting bracket 5, and the mounting bracket 5 is welded to the body 1. Specifically, the mounting bracket 5 includes a fourth connecting portion 51, and the body 1 includes a fourth matching portion 15. The fourth connecting portion 51 and the fourth matching portion 15 are welded together, and the matching connection portion of the fourth connecting portion 51 and the fourth matching portion 15 is defined as a fourth matching welding portion, and the chromium-free passivation layer 110 at least covers the outer surface of the fourth matching welding portion. The chromium-free passivation layer 110 at least covers the welding portion between the mounting bracket 5 and the body 1 and the outer surface of the mounting bracket 5, improves the corrosion resistance of the mounting bracket 5, enables the mounting bracket 5 to support the liquid reservoir more reliably, and further improves the overall corrosion resistance of the liquid reservoir 100. The mounting bracket 5 also includes a third base portion 510. In order to further improve the corrosion resistance of the mounting bracket 5, the chromium-free passivation layer 110 at least covers the third base portion 510, and can further ensure the stability of the mounting bracket 5.

[0031] In order to enter one To improve the overall corrosion resistance of the liquid reservoir 100, the liquid reservoir 100 also includes an outer layer 120, the outer layer 120 covers at least part of the outer surface of the chromium-free passivation layer 110, and the outer layer 120 is obtained by a spraying process, such as painting, spraying or powder spraying, which can further improve the corrosion resistance of the liquid reservoir 100. The outer layer 120 can not only protect the liquid reservoir 100 and slow down the corrosion rate of the liquid reservoir 100, but also play a role in beautifying and decorating the liquid reservoir 100. For example, the outer layer 120 can cover the weld on the surface of the liquid reservoir 100, making the finished product of the liquid reservoir 100 more beautiful. Figure 5 , Figure 5 The chromium-free passivation layer 110 covers the outer surface of the second joint welding portion, and the outer layer 120 covers the chromium-free passivation layer 110. Figure 3 , Figure 3 It shows a situation that the chromium-free passivation layer 110 covers the outer surface of the second base part 2200 , and the outer layer 120 covers the chromium-free passivation layer 110 .

[0032] The pipeline assembly 2 also includes a third pipe 23, the second pipe 22 includes a second joint part 222, the third pipe 23 includes a third joint part 231 matched with the second joint part 222, the second pipe 22 and the third pipe 23 are matched and welded at the second joint part 222 and the third joint part 231, and the welding welding part of the second pipe 22 and the third pipe 23 is defined as the fifth matching welding part, and the chromium-free passivation layer 110 at least covers the outer surface of the fifth matching welding part, which can improve the corrosion resistance of the fifth welding part; the outer layer 120 can also be provided to cover at least part of the chromium-free passivation layer 110, so as to further improve the corrosion resistance of the fifth welding part. The material of the third pipe 23 can be copper. Since copper has strong corrosion resistance and the third pipe 23 is mainly used to connect with the system pipe, when the pipeline assembly 2 is passivated, the third pipe 23 can be wrapped, and the final surface treatment can be performed after the subsequent connection with the system pipe. It will not be described in detail here.

[0033] The material of the body 1 of the liquid storage device 100 provided in the present application can be aluminum, steel or copper, and the material of the first pipe 21 can also be aluminum, steel or copper; the material of the first pipe 21 can be different from or the same as the second pipe 22, and can also be aluminum, steel or copper; the materials of the various parts of the liquid storage device 100 can be combined with each other according to the actual product situation, for example: the body 1 is an aluminum body, the first pipe 21 is an aluminum pipe, the second pipe 22 is a steel pipe, the third pipe 23 is a copper pipe, the adapter 41 is an aluminum adapter, and the mounting bracket 5 is an aluminum bracket. Of course, there can be other combinations, which will not be repeated here.

[0034] The chromium-free passivation layer 110, the chromium-free passivation layer 110 and the outer surface layer 1 20 Yes According to the actual working environment of the product, it is flexibly set, and the passivation film weight is preferably set to 1~20mg / m2, the corrosion resistance of the reservoir 100 can reach the requirements of 2000 hours of acid salt spray test and 48 hours of steam test, thereby meeting the requirements of the highly corrosive environment of marine transportation. If the chromium-free passivation layer 110 is too thin, it cannot meet the requirements of corrosion protection, and if the chromium-free passivation layer is too thick, it is not conducive to cost saving. Furthermore, an outer layer 120 can be set on the surface of the chromium-free passivation layer 110. If the outer layer 120 is too thin, higher corrosion resistance cannot be achieved, and the aesthetics of the surface of the reservoir 100 is also affected; if the outer layer 120 is too thick, it is not conducive to cost saving. Therefore, the thickness of the outer layer 120 finally formed is preferably set to 60μm~150μm.

[0035] The present invention also provides a method for manufacturing a liquid reservoir 100, wherein the liquid reservoir 100 comprises a body 1 and a connector 3, and the method for manufacturing the liquid reservoir 100 comprises at least the following steps:

[0036] Welding step: providing a connector 3 and a body 1, assembling and welding the body 1 and the connector 3 to obtain a liquid storage device blank, and defining a matching welding portion between the body 1 and the connector 3 as a matching welding portion;

[0037] Passivation process: a chromium-free passivation solution is used to perform a passivation process on at least the matching weld part, so that the chromium-free passivation solution at least contacts the matching weld part to generate a chromium-free passivation layer 110, and the chromium-free passivation layer 110 at least covers the outer surface of the matching weld part.

[0038] The liquid storage device 100 manufactured by the above method has relatively improved overall corrosion resistance, and in the process of passivation treatment, a chromium-free passivation solution is used for passivation, and no substances harmful to human body and environment are generated.

[0039] In order to further improve the corrosion resistance of the liquid reservoir 100, the manufacturing method of the liquid reservoir also includes: after the liquid reservoir blank is subjected to a passivation process treatment step, the outer surface of the liquid reservoir blank to which the chromium-free passivation layer 110 is attached is sprayed with a coating or powder to form an outer surface layer 120, and the spraying range at least includes a portion of the surface of the chromium-free passivation layer 110; the outer surface layer 120 can not only protect the liquid reservoir 100 and slow down the corrosion rate of the liquid reservoir 100, but also play a role in beautifying and decorating the liquid reservoir 100. For example, the outer surface layer 120 can cover the weld on the surface of the liquid reservoir 100, making the finished product of the liquid reservoir 100 more beautiful.

[0040] In order to improve the bonding strength between the surface of the liquid reservoir blank and the outer layer 120, the manufacturing method of the liquid reservoir further includes: before the liquid reservoir blank is subjected to the passivation process step, at least the surface of the liquid reservoir blank is passivated by sand material. Match the outer surface of the welding part Sandblasting is performed. Sandblasting is used to improve the surface quality of the liquid reservoir blank. The roughness is increased, thereby improving the bonding force between the surface of the liquid reservoir blank and the outer layer 120, so that the outer layer 120 can be more firmly bonded to the surface of the liquid reservoir blank and is not easy to fall off, further improving the corrosion resistance of the liquid reservoir 100. Furthermore, the body 1 includes a main body 11, and the connecting member 3 includes a base portion. The main body 11 and / or the base portion of the body 1 can also be sandblasted to improve the bonding force between the main body 11, the base portion and the outer layer 120 of the liquid reservoir, so that the outer layer 120 can be more firmly bonded to the surface of the liquid reservoir blank and is not easy to fall off, further improving the corrosion resistance of the liquid reservoir 100.

[0041] In the passivation process, the pH value of the chromium-free passivation solution is preferably set within the range of 2.6-4.0, which is more conducive to improving the effect of passivation treatment on the surface of the liquid reservoir blank. In addition, the aluminum point in the chromium-free passivation solution needs to be controlled within the range of <300 mg / L, because when the aluminum point in the chromium-free passivation solution is too high, it is not conducive to passivation treatment, the passivation effect is also relatively poor, and it is not conducive to forming the chromium-free passivation layer 110.

[0042] In the passivation treatment step, the liquid reservoir blank needs to be in contact with the chromium-free passivation solution. The treatment method can be a spraying method or an immersion method. The contact time of the chromium-free passivation solution with the liquid reservoir blank is preferably 15s to 60s, and the temperature of the chromium-free passivation solution is preferably set to room temperature. In this way, the chromium-free passivation solution and the surface of the liquid reservoir blank are in contact and react more fully, which is more conducive to the generation of the chromium-free passivation layer 110, and further improves the corrosion resistance of the liquid reservoir 100. After the passivation treatment step is completed, at least part of the surface of the liquid reservoir blank is covered with the chromium-free passivation layer 110, which can achieve better corrosion resistance. The chromium-free passivation layer 110 is in a relatively transparent state, which can reveal the true color of the liquid reservoir and is more beautiful. Compared with the previous passivation treatment using a hexavalent chromium solution, this solution is more conducive to environmental protection and does not produce some substances harmful to the human body.

[0043] The liquid reservoir manufacturing method provided in the present application can form a chromium-free passivation layer 110 on the surface of the liquid reservoir that is beneficial to improving the corrosion resistance. The technical solution of this embodiment can also be applied to the manufacture of metal pipelines such as steel, iron, aluminum, magnesium, and copper, as well as silencers, filters, oil separators, gas collecting pipes and other equipment.

[0044] A local treatment method is now introduced, which uses a seal or a spacer to separate the part of the liquid storage blank that does not need to be treated, so that the surface to be treated is exposed, and the part is sprayed or immersed. Furthermore, the direction and angle of the spray head can be set, and the blank is placed on the production line to batch-treat the part to be treated. Positioning spray, spraying stops after the set time. The scheme can relatively reduce the use of chromium-free passivation solution speed up the processing speed.

[0045] According to the different anti-corrosion requirements of the application environment of the liquid storage device 100 product, a chromium-free passivation layer 110 and an outer layer 120 can be adaptively set at various parts. For example, the outer surface of the connecting part of each pipe fitting can be passivated, and the base part of the device body can also be passivated, or the base part of the first pipe fitting, the second pipe fitting, and the third pipe fitting can be passivated. Since the corrosion resistance of the pipe fitting matching section is lower than that of other parts, at least the above-mentioned treatment steps are performed on this part.

[0046] The manufacturing method of the liquid reservoir provided in this embodiment can form a corrosion-resistant chromium-free passivation layer on the surface of the liquid reservoir. In addition to the passivation treatment step, it also includes: a degreasing step, which can make the surface of the liquid reservoir clean and rough, and improve the bonding strength of the subsequent outer surface layer; a cleaning step, which further improves the cleanliness of the surface of the liquid reservoir, and can also eliminate the influence of calcium and magnesium ions on the surface of the liquid reservoir; a drying step, which removes moisture from the surface of the liquid reservoir, so that the surface of the liquid reservoir has residual temperature, which is convenient for the attachment of the outer surface layer, further improves the corrosion resistance of the liquid reservoir, and has beautiful decorative properties. Here, other steps are not repeated. Furthermore, the technical solution of this embodiment can also be applied to the manufacture of metal pipelines such as steel, iron, aluminum, magnesium, and copper, and equipment such as silencers, filters, oil separators, and gas collecting pipes.

[0047] It should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although the present invention has been described in detail in this specification with reference to the above embodiments, it should be understood by those skilled in the art that the present invention can still be modified or replaced by equivalents, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A liquid reservoir, comprising a body (1) and a connecting member (3), wherein the connecting member (3) is connected to the body (1) by welding, the connecting member (3) comprises a connecting portion (33), the body (1) comprises a matching portion (13), the connecting portion (33) and the matching portion (13) are connected by matching welding, a matching welding portion between the connecting portion (33) and the matching portion (13) is defined as a matching welding portion, the liquid reservoir (100) comprises a chromium-free passivation layer (110), and the chromium-free passivation layer (110) at least covers an outer surface of the matching welding portion.

2. The liquid storage device according to claim 1, characterized in that: The connecting piece (3) is a pipe assembly (2), the pipe assembly (2) at least comprising a first pipe (21), the device body (1) being connected to the first pipe (21) by welding, the first pipe (21) comprising a first connecting portion (211), the device body (1) comprising a first matching portion (12), the first connecting portion (211) being connected to the first matching portion (12) by matching welding, the matching welding portion between the first connecting portion (211) and the first matching portion (12) being defined as a first matching welding portion, and the chromium-free passivation layer (110) at least covers the outer surface of the first matching welding portion.

3. The liquid storage device according to claim 2, characterized in that: The device body (1) comprises a main body (11), the first tube (21) comprises a first base body (2100), and the chromium-free passivation layer (110) at least further covers the outer surface of the main body (11) and / or the first base body (2100).

4. The liquid storage device according to claim 3, characterized in that: The pipeline assembly (2) further comprises a second pipe fitting (22), the second pipe fitting (22) comprising a first joint portion (221), the first pipe fitting (21) comprising a second connection portion (212), the second connection portion (212) and the first connection portion (221) being respectively arranged at two ends of the second pipe fitting (22), the first joint portion (221) and the second connection portion (212) being connected by welding, the matching welding portion between the first joint portion (221) and the second connection portion (212) being defined as a second matching welding portion, and the chromium-free passivation layer (110) at least covers the outer surface of the second matching welding portion.

5. The liquid storage device according to claim 4, characterized in that: The first tube (21) comprises a first base part (2100), the second tube (22) comprises a second base part (2200), and the chromium-free passivation layer (110) at least further covers the outer surface of the first base part (2100) and / or the second base part (2200).

6. The liquid storage device according to claim 1, characterized in that: The connecting piece (3) is a connecting component (4), the connecting component (4) is arranged on the side wall surface of the device body (1), the connecting component (4) comprises an adapter seat (41), the side wall surface of the device body (1) is provided with an opening portion (14), the adapter seat (41) and the opening portion (14) are connected by welding, the adapter seat (41) comprises a third connecting portion (411), the opening portion (14) comprises a third matching portion (141), the third connecting portion (411) and the third matching portion (141) are connected by welding, the matching connection portion between the third connecting portion (411) and the third matching portion (141) is defined as a third matching welding portion, and the chromium-free passivation layer (110) at least also covers the outer surface of the third matching welding portion.

7. The liquid storage device according to claim 1, characterized in that: The connecting member (3) is a mounting bracket (5), the mounting bracket (5) comprises a fourth connecting portion (51) and a third base portion (510), the device body (1) comprises a fourth matching portion (15), the fourth connecting portion (51) and the fourth matching portion (15) are matched and welded together, the matching connection portion between the fourth connecting portion (51) and the fourth matching portion (15) is defined as a fourth matching welding portion, and the chromium-free passivation layer (110) at least also covers the outer surface of the fourth matching welding portion and / or the third base portion (510).

8. The liquid storage device according to any one of claims 1 to 7, characterized in that: The liquid reservoir (100) comprises an outer layer (120), wherein the outer layer (120) covers at least a portion of the chromium-free passivation layer (110).

9. A method for manufacturing a liquid reservoir, for manufacturing the liquid reservoir according to any one of claims 1 to 7, comprising at least the following steps: Welding step: providing a connecting piece (3) and a body (1), assembling and welding the body (1) and the connecting piece (3) to obtain a liquid storage device blank, and defining a matching welding portion between the body (1) and the connecting piece (3) as a matching welding portion; Sandblasting step: performing sandblasting process on at least the outer surface of the matching welding part; Passivation process: using a chromium-free passivation solution to perform a passivation treatment on at least the matching weld portion, thereby generating a chromium-free passivation layer (110) covering at least the outer surface of the matching weld portion; Spraying step: performing a spraying process on at least a portion of the surface of the chromium-free passivation layer (110) to form an outer surface layer (120).

10. A method for manufacturing a liquid reservoir, the method comprising at least the following steps: Welding step: providing a connecting piece (3) and a body (1), assembling and welding the body (1) and the connecting piece (3) to obtain a liquid storage device blank, and defining a matching welding portion between the body (1) and the connecting piece (3) as a matching welding portion; Passivation process treatment: using a chromium-free passivation solution to perform a passivation treatment on at least the matching weld portion, thereby generating a chromium-free passivation layer (110) covering at least the outer surface of the matching weld portion.

11. The method for manufacturing a liquid storage device according to claim 10, characterized in that: The manufacturing method of the liquid storage device further comprises the following step: before the passivation process, at least the outer surface of the matching welding part is subjected to a sandblasting process.

12. The method for manufacturing a liquid storage device according to claim 11, characterized in that: The manufacturing method of the liquid storage device further comprises the following steps: after the passivation process, at least the surface of the chromium-free passivation layer (110) is subjected to a spraying process to form an outer surface layer (120).

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