阅读说明：本技术 用于焊后在线热处理的气体保护装置及其使用方法 (Gas protection device for post-welding online heat treatment and use method thereof ) 是由 陈双建 李志军 黎超文 玉昆 于 2020-05-27 设计创作，主要内容包括：本申请涉及热处理技术,公开了一种用于焊后在线热处理的气体保护装置及其使用方法,能够在热处理前对管道内部空气进行快速、有效置换,实现管道内壁高效防氧化保护。该气体保护装置包括气路控制部件,其包括三通管、压力真空表和阀门,三通管的第一端用于接入待热处理管道,压力真空表设在三通管的第二端处,阀门设三通管上且靠近三通管的第三端处；真空接入部件,其包括第一管道,第一管道的第一端与真空泵连接用于接入真空,第一管道的第二端与三通管的第三端可快速拆卸连接；以及惰性气体接入部件,其包括第二管道,第二管道的第一端与惰性气体气源连接用于接入惰性气体,第二管道的第二端与三通管的第三端可快速拆卸连接。(The application relates to a heat treatment technology, and discloses a gas protection device for post-welding online heat treatment and a use method thereof, which can quickly and effectively replace air in a pipeline before heat treatment, and realize efficient anti-oxidation protection of the inner wall of the pipeline. The gas protection device comprises a gas circuit control part, a gas circuit control part and a gas circuit control part, wherein the gas circuit control part comprises a three-way pipe, a pressure vacuum gauge and a valve, the first end of the three-way pipe is used for being connected into a pipeline to be thermally treated, the pressure vacuum gauge is arranged at the second end of the three-way pipe, and the valve is arranged on the three-way pipe and close to the third end of the three-way pipe; the vacuum access component comprises a first pipeline, a first end of the first pipeline is connected with the vacuum pump and used for accessing vacuum, and a second end of the first pipeline is connected with a third end of the three-way pipe in a quick detachable manner; and the inert gas access component comprises a second pipeline, the first end of the second pipeline is connected with an inert gas source and used for accessing inert gas, and the second end of the second pipeline is connected with the third end of the three-way pipe in a quick detachable manner.)

1. A gas shield apparatus for post weld in-line heat treatment, comprising:

the gas path control part comprises a three-way pipe, a pressure vacuum gauge and a valve, wherein the first end of the three-way pipe is used for being connected into a pipeline to be subjected to heat treatment, the pressure vacuum gauge is arranged at the second end of the three-way pipe, and the valve is arranged on the three-way pipe and close to the third end of the three-way pipe;

the vacuum access component comprises a first pipeline and a vacuum pump, wherein a first end of the first pipeline is connected with the vacuum pump for accessing vacuum, and a second end of the first pipeline is in quick detachable connection with a third end of the three-way pipe;

and the inert gas access component comprises a second pipeline and an inert gas source, the first end of the second pipeline is connected with the inert gas source and is used for accessing inert gas, and the second end of the second pipeline is connected with the third end of the three-way pipe in a quick detachable manner.

2. The gas shield apparatus for the post weld on-line heat treatment of claim 1, wherein the three-way pipe, the pressure vacuum gauge and the valve are connected by screw thread or welding respectively;

the first end of the first pipeline is connected with the vacuum pump through a hoop or a thread;

and the first end of the second pipeline is connected with the inert gas source through a hoop or a thread.

3. The gas shield apparatus for post-weld in-line heat treatment of claim 1, wherein the pipe to be heat treated is a closed loop pipe or a cartridge-type device.

4. The gas-shielded apparatus for in-line post-weld heat treatment as defined in claim 1, wherein the valve is made of metal.

5. The gas protecting device for the post-weld on-line heat treatment as claimed in claim 1, wherein the third end of the three-way pipe and the second end of the first pipeline adopt a quick-detachable connecting structure of a quick connector, the third end of the three-way pipe is provided with a male head of the quick connector, and the second end of the first pipeline is provided with a female head matched with the male head in specification;

the third end of the three-way pipe and the second end of the second pipeline adopt a quick-detachable connection structure of a quick connector, and the second end of the second pipeline is provided with a female head matched with the male head in specification.

6. The gas protecting device for the post-weld on-line heat treatment as claimed in claim 1, wherein the third end of the three-way pipe and the second end of the first pipeline adopt a quick-detachable connecting structure of a quick coupling, the third end of the three-way pipe is provided with a female head of the quick coupling, and the second end of the first pipeline is provided with a male head matched with the female head in specification;

the third end of the three-way pipe and the second end of the second pipeline adopt a quick-detachable connecting structure of a quick connector, and the second end of the second pipeline is provided with a male head matched with the female head in specification.

7. The gas shield apparatus for in-line post weld heat treatment of claim 1, wherein the inert gas is argon.

8. A method of using a gas shield for post-weld in-line heat treatment, wherein the gas shield is according to any one of claims 1 to 7; the using method comprises the following steps:

a, connecting the gas path control component with the vacuum access component, sequentially opening a vacuum pump and a valve, and vacuumizing a closed loop pipeline to be subjected to heat treatment;

b, when the scale of the pressure vacuum meter is reduced to a first preset threshold value, closing the valve and the vacuum pump in sequence, and detaching and separating the gas path control component and the vacuum access component;

c, connecting the gas path control part with the inert gas access part, sequentially opening an inert gas source and the valve, and filling inert gas into the loop pipeline;

and D, when the scale of the pressure vacuum gauge rises to a second preset threshold, reducing the air inlet flow of inert gas to keep the pressure vacuum gauge at positive pressure until the heat treatment is finished.

9. The method of using a gas shield apparatus for post weld in-line heat treatment as recited in claim 8 in which after step C, further comprising:

and D, repeating the steps A to C at least once and then entering the step D when the scale of the pressure vacuum gauge rises to a second preset threshold value so as to fully replace the air in the tube.

10. The method of using the gas shield apparatus for the post-weld in-line heat treatment according to claim 8 or 9, wherein the first predetermined threshold value is-0.09 Mpa and the second predetermined threshold value is 0 Mpa.

Technical Field

The application relates to the technical field of heat treatment, in particular to a gas protection technology for on-line heat treatment after welding.

Background

At present, many materials need heat treatment work after welding, and the heat treatment after welding can be used for improving the structure and the performance of a welding part, such as eliminating residual welding stress, recovering and improving the mechanical property of a joint, eliminating diffused hydrogen in a welding joint and the like.

Although most of the welding structures and equipment can be selected to be processed off-line, in the case of pipelines or equipment which need post-welding heat treatment and are welded on site, especially loop pipelines and cylindrical equipment which have strict requirements on oxidation resistance of the inner wall surface and cannot be cleaned subsequently, inert gas protection must be carried out on the inner wall during heat treatment. When the internal volume is large, if only inert gas is used for internal air replacement, waste is serious and economic cost is high, so that improvement of the protection device and method before heat treatment is required.

Disclosure of Invention

The application aims to provide a gas protection device for postweld online heat treatment and a using method thereof, which can quickly and effectively replace the air inside a pipeline before postweld heat treatment, save time and economic cost, realize high-efficiency anti-oxidation protection of the inner wall of the pipeline, improve the quality of the inner wall, and reduce or avoid the workload of post-treatment.

The application discloses a gas protection device for online thermal treatment after welding includes:

the gas path control part comprises a three-way pipe, a pressure vacuum gauge and a valve, wherein the first end of the three-way pipe is used for being connected into a pipeline to be subjected to heat treatment, the pressure vacuum gauge is arranged at the second end of the three-way pipe, and the valve is arranged on the three-way pipe and close to the third end of the three-way pipe;

the vacuum access component comprises a first pipeline and a vacuum pump, wherein a first end of the first pipeline is connected with the vacuum pump for accessing vacuum, and a second end of the first pipeline is in quick detachable connection with a third end of the three-way pipe;

and the inert gas access component comprises a second pipeline and an inert gas source, the first end of the second pipeline is connected with the inert gas source and is used for accessing inert gas, and the second end of the second pipeline is connected with the third end of the three-way pipe in a quick detachable manner.

In a preferred embodiment, the three-way pipe, the pressure vacuum meter and the valve are connected by adopting a threaded connection or a welding connection respectively;

the first end of the first pipeline is connected with the vacuum pump through a hoop or a thread;

and the first end of the second pipeline is connected with the inert gas source through a hoop or a thread.

In a preferred embodiment, the pipe to be heat-treated is a closed loop pipe or a cartridge-type device.

In a preferred embodiment, the valve is made of metal.

In a preferred embodiment, the third end of the three-way pipe and the second end of the first pipeline adopt a quick-detachable connection structure of a quick connector, the third end of the three-way pipe is provided with a male head of the quick connector, and the second end of the first pipeline is provided with a female head matched with the male head in specification;

the third end of the three-way pipe and the second end of the second pipeline adopt a quick-detachable connection structure of a quick connector, and the second end of the second pipeline is provided with a female head matched with the male head in specification.

In a preferred embodiment, the third end of the three-way pipe and the second end of the first pipeline adopt a quick-detachable connection structure of a quick connector, the third end of the three-way pipe is provided with a female head of the quick connector, and the second end of the first pipeline is provided with a male head matched with the female head in specification;

the third end of the three-way pipe and the second end of the second pipeline adopt a quick-detachable connecting structure of a quick connector, and the second end of the second pipeline is provided with a male head matched with the female head in specification.

In a preferred embodiment, the inert gas is argon.

The application also discloses a use method of the gas protection device for the post-welding online heat treatment, wherein the use method of the gas protection device comprises the following steps:

a, connecting the gas path control component with the vacuum access component, sequentially opening a vacuum pump and a valve, and vacuumizing a closed loop pipeline to be subjected to heat treatment;

b, when the scale of the pressure vacuum meter is reduced to a first preset threshold value, closing the valve and the vacuum pump in sequence, and detaching and separating the gas path control component and the vacuum access component;

c, connecting the gas path control part with the inert gas access part, sequentially opening an inert gas source and the valve, and filling inert gas into the loop pipeline;

and D, when the scale of the pressure vacuum gauge rises to a second preset threshold, reducing the air inlet flow of inert gas to keep the pressure vacuum gauge at positive pressure until the heat treatment is finished.

In a preferred embodiment, after the step C, the method further includes:

and D, repeating the steps A to C at least once and then entering the step D when the scale of the pressure vacuum gauge rises to a second preset threshold value so as to fully replace the air in the tube.

In a preferred embodiment, the first predetermined threshold is-0.09 Mpa, and the second predetermined threshold is 0 Mpa.

The embodiment of this application is through inserting the part with the vacuum with gas circuit control unit, but the inert gas inserts the part and disposes quick detachable connection structure respectively, can be so that fast switch over fills inert gas after the evacuation to from the evacuation to when filling inert gas operation valve close, when realizing the quick replacement of the inside gas of pipeline, avoid switching the in-process vacuum and reveal and then introduce the air, thereby influence intraductal vacuum and argon gas purity. The operation is convenient, the waste of protective gas is avoided, and the cost is saved.

In addition, the implementation mode of the application can effectively ensure the oxidation resistance of the inner wall surface in the post-welding heat treatment process of the loop pipeline, particularly for a pipeline system which cannot perform internal treatment on the pipeline and has a running medium sensitive to oxide impurities, the inner surface does not need to be subjected to acid pickling or reduction treatment after heat treatment, and therefore the quality of the inner wall surface of the pipeline is improved.

In addition, through experimental verification, the inner wall protection of the pipeline is carried out on the online heat treatment of the two-loop pipeline of the molten salt reactor according to the embodiment of the application, for example, fig. 3(b) is an effect diagram after the heat treatment of fig. 3(a) according to the embodiment of the application, it can be found that the anti-oxidation effect of the inner wall is remarkable, and the inner wall of the circumferential weld of the heat treatment pipeline presents silvery white metallic luster, so that the influence of the existence of an oxidation layer on the purity of a molten salt medium in the subsequent process is greatly reduced.

The present specification describes a number of technical features distributed throughout the various technical aspects, and if all possible combinations of technical features (i.e. technical aspects) of the present specification are listed, the description is made excessively long. In order to avoid this problem, the respective technical features disclosed in the above summary of the invention of the present application, the respective technical features disclosed in the following embodiments and examples, and the respective technical features disclosed in the drawings may be freely combined with each other to constitute various new technical solutions (which are considered to have been described in the present specification) unless such a combination of the technical features is technically infeasible. For example, in one example, the feature 1+2+3 is disclosed, in another example, the feature 1+2+4+5 is disclosed, and the features 3 and 4 are equivalent technical means for the same purpose, so long as the features are used alternatively and cannot be adopted simultaneously, and the feature 5 can be combined with the feature 3 technically, then the solution of 1+2+3+4 should not be considered as being described because the technology is not feasible, and the solution of 1+2+3+5 should be considered as being described.

Drawings

FIG. 1 is a schematic structural view of a gas shield apparatus for post-weld in-line heat treatment according to a first embodiment of the present application;

FIG. 2 is a schematic flow diagram of a method of using a gas shield apparatus for post weld in-line heat treatment according to a second embodiment of the present application;

FIG. 3(a) is a schematic illustration of an exemplary reactor loop pipe weld joint inner wall surface prior to heat treatment;

fig. 3(b) is a schematic diagram illustrating the protective effect of the inner wall of the pipe after the on-line heat treatment of the loop pipe of fig. 3(a) is completed according to the embodiment of the present application.

Wherein the content of the first and second substances,

101-gas path control part 1011-three-way pipe 1012-pressure vacuum meter

1013-valve 102-vacuum access part 1021-first pipe

1022-vacuum pump 103-inert gas access component 1031-second conduit

1032-inert gas source 1041-male coupling 1042 of quick coupling-female coupling

1043-female of quick coupling 105-closed pipe to be heat treated

Road (or equipment)

Detailed Description

In the following description, numerous technical details are set forth in order to provide a better understanding of the present application. However, it will be understood by those skilled in the art that the technical solutions claimed in the present application may be implemented without these technical details and with various changes and modifications based on the following embodiments.

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

The first embodiment of the present application relates to a gas protection device for post-weld on-line heat treatment, which has a structure as shown in fig. 1, and comprises a gas path control component, a vacuum access component and an inert gas access component.

Specifically, the gas path control component 101 comprises a three-way pipe 1011, a pressure vacuum gauge 1012 and a valve 1013, wherein a first end of the three-way pipe 1011 is used for connecting the pipe 105 to be heat treated, the pressure vacuum gauge 1012 is arranged at a second end of the three-way pipe 1011, and the valve 1013 is arranged on the three-way pipe 1011 and near a third end of the three-way pipe 1011.

Optionally, the valve 1013 is made of metal.

The vacuum connection part 102 comprises a first pipe 1021 and a vacuum pump 1022, wherein a first end of the first pipe 1021 is connected with the vacuum pump 1022 for connecting vacuum, and a second end of the first pipe 1021 is connected with a third end of the tee 1011 in a quick detachable way.

The inert gas connecting component 103 comprises a second pipe 1031 and an inert gas source 1032, wherein a first end of the second pipe 1031 is connected with the inert gas source 1032 for connecting inert gas, and a second end of the second pipe 1031 is connected with a third end of the three-way pipe 1011 in a quick detachable manner.

Optionally, the connection between the tee 1011, the pressure vacuum gauge 1012 and the valve 1013 is a threaded connection or a welded connection, and the connection between the first end of the first pipe 1021 and the vacuum pump 1022 is a clamp or a threaded connection; the first end of the second conduit 1031 is connected to the inert gas source 1032 by a clamp or a screw.

Preferably, the tee pipe 1011, the pressure vacuum gauge 1012 and the valve 1013 are all connected by welding, so that the sealing performance of the device can be ensured.

Optionally, the pipe 105 to be heat treated is a closed loop pipe or a cartridge-mounted device. For example, for circuits and devices having two or more nozzles, one of the nozzles is connected to the gas-protecting means described herein (e.g., welding can be achieved by a transfer tube), and the remaining nozzles can be sealed, for example, by blind plates, valves, gas plugs, and the like.

Optionally, the second end of the first pipe 1021 and the third end of the three-way pipe 1011 adopt a quick detachable connection structure of a quick coupling, the third end of the three-way pipe 1011 is provided with a male head 1041 of the quick coupling, and the second end of the first pipe 1021 is provided with a female head 1042 matched with the male head 1041 in specification; and the second end of the second pipe 1031 and the third end of the three-way pipe 1011 adopt a quick detachable connection structure of a quick coupling, and the second end of the second pipe 1031 is provided with a female head 1043 matched with the specification of the male head 1042.

Optionally, the second end of the first pipe 1021 and the third end of the three-way pipe 1011 adopt a quick detachable connection structure of a quick coupling, the third end of the three-way pipe 1011 is provided with a female head of the quick coupling, and the second end of the first pipe 1021 is provided with a male head matched with the female head in specification; and the second end of the second pipe 1031 and the third end of the three-way pipe 1011 adopt a quick-detachable connection structure of a quick joint, and the second end of the second pipe 1031 is provided with a male head matched with the female head in specification.

Optionally, the quick coupling is made of metal.

Alternatively, inert gas source 1032 may be an inert gas cylinder or an inert gas tank.

Alternatively, the inert gas may be, but is not limited to, helium, argon, xenon, or the like. Preferably argon.

A second embodiment of the present application relates to a method of using a gas shield apparatus for post-weld in-line heat treatment, which is the apparatus of the first embodiment to which the technical details in the first embodiment can be applied.

The flow of the using method of the gas protection device for the post-weld online heat treatment is shown in fig. 2, the gas protection device for the post-weld online heat treatment is the gas protection device of the first embodiment, and the using method comprises the following steps:

in step 201, the male connectors of the gas path control component and the vacuum access component are inserted into the female connector of the quick connector at the third end of the three-way pipe, and the vacuum pump and the valve are sequentially opened.

Then, step 202 is performed to perform a vacuum process on the closed loop pipe requiring the heat treatment.

Then, step 203 is performed to determine whether the pressure vacuum gauge scale drops to a first preset threshold.

And if the pressure vacuum gauge scale is reduced to a first preset threshold value, the step 204 is carried out, the valve and the vacuum pump are sequentially closed, and the male heads of the quick connectors of the gas path control component and the vacuum access component are separated from the female head of the quick connector at the third end of the three-way pipe and pulled out. Otherwise, the procedure returns to step 202.

Optionally, the first predetermined threshold is-0.09 MPa (gauge).

Then, step 205 is performed, the male connectors of the gas path control component and the inert gas access component are inserted into the female connector of the quick connector at the third end of the three-way pipe, and the inert gas source and the valve are sequentially opened.

Then, step 206 is entered, and inert gas is filled into the loop pipe.

For example, the flow rate of the intake gas when the inert gas is charged may be 30 to 50L/min.

Then, the process proceeds to step 207, where it is determined whether the pressure vacuum gauge scale has risen to a second preset threshold.

If the vacuum gauge scale rises to a second predetermined threshold, step 208 is entered to reduce the inlet flow of inert gas to maintain the vacuum gauge at positive pressure until the heat treatment is completed. Otherwise, return to step 206.

Optionally, the second predetermined threshold is 0Mpa (gauge pressure).

For example, the flow rate of the inert gas may be adjusted to 10L/min or less.

Optionally, after the step 207, the following steps are further included:

and if the pressure vacuum gauge scale rises to a second preset threshold value, returning to the step 201, and circularly executing the steps 201-207 at least once and then entering the step 208. Preferably 1 or 2 cycles. Therefore, air in the pipeline can be replaced more thoroughly, and the anti-oxidation protection effect of the inner wall of the pipeline is better achieved.

The steps in the present embodiment can be implemented by manual operations.

The connection of the gas path control member according to the present embodiment to the inert gas inlet member or the vacuum inlet member should be completed quickly, and may be controlled to be completed within 30 seconds, for example.

It is noted that, in the present patent application, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the use of the verb "comprise a" to define an element does not exclude the presence of another, same element in a process, method, article, or apparatus that comprises the element. In the present patent application, if it is mentioned that a certain action is executed according to a certain element, it means that the action is executed according to at least the element, and two cases are included: performing the action based only on the element, and performing the action based on the element and other elements. The expression of a plurality of, a plurality of and the like includes 2, 2 and more than 2, more than 2 and more than 2.

All documents mentioned in this application are to be considered as being incorporated in their entirety into the disclosure of this application so as to be subject to modification as necessary. Further, it is understood that various changes or modifications may be made to the present application by those skilled in the art after reading the above disclosure of the present application, and such equivalents are also within the scope of the present application as claimed.