CN112743207A - Semi-closed welding protection device for to-be-welded part - Google Patents
Semi-closed welding protection device for to-be-welded part Download PDFInfo
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- CN112743207A CN112743207A CN202011561018.0A CN202011561018A CN112743207A CN 112743207 A CN112743207 A CN 112743207A CN 202011561018 A CN202011561018 A CN 202011561018A CN 112743207 A CN112743207 A CN 112743207A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
- B23K9/325—Devices for supplying or evacuating shielding gas
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Abstract
The invention provides a welding protection device of a semi-closed type part to be welded, which comprises a gas transmission pipe fitting, a first adjusting part and a backflow pressure maintaining assembly, wherein one end of the gas transmission pipe fitting is communicated with a protective gas source for providing protective gas through the first adjusting part, and the other end of the gas transmission pipe fitting penetrates through the backflow pressure maintaining assembly, extends into a semi-closed inner cavity of the semi-closed type part to be welded and transmits the protective gas into the semi-closed inner cavity; the first adjusting component is used for adjusting the flow of the protective gas provided by the protective gas source; the backflow pressure maintaining assembly is communicated with the atmosphere and the semi-closed inner cavity respectively, so that protective gas entering the semi-closed inner cavity can flow back to the semi-closed inner cavity and form internal pressure in the semi-closed inner cavity, and the backflow pressure maintaining assembly is also communicated with a pressure measuring device capable of detecting the internal pressure. The welding protection device for the semi-closed type part to be welded provided by the invention can improve the accuracy, the use stability and the cleanliness of the semi-closed type part to be welded after welding, and improve the welding yield of the semi-closed type part to be welded.
Description
Technical Field
The invention relates to the technical field of welding equipment, in particular to a semi-closed welding protection device for a to-be-welded part.
Background
Mass Flow controllers (Mass Flow controllers, abbreviated as MFCs) are instruments for precisely measuring and controlling Mass Flow of fluids, and as Mass Flow controllers are widely used in various technical fields such as semiconductor technology, microelectronic technology, integrated circuit technology, photovoltaic technology, etc., they have important roles in scientific research and production in these technical fields, and also provide more rigorous requirements for various performances of Mass Flow controllers, especially for the performances of the Mass Flow controllers such as precision, stability, cleanliness, etc.
As shown in fig. 1, a valve body applied to a mass flow controller in the prior art includes a valve seat 11 and a stud head 12, wherein a channel 13 penetrating through the valve seat 11 is disposed in the valve seat 11, the stud head 12 is in interference fit with one end of the channel 13 to seal one end of the channel 13, so as to semi-seal the channel 13, so as to form a semi-sealed inner cavity in the valve body, the valve seat 11 and the stud head 12 are welded during production of the semi-sealed valve body, generally, argon arc welding is adopted to isolate air by means of argon gas, so as to avoid oxidation of the outer side of the welding position of the valve seat 11 and the stud head 12, however, when the valve seat 11 and the stud head 12 are welded, because the inner side of the welding position of the valve seat 11 and the stud head 12 is not protected, welding impurities exist in the channel 13 of the valve seat 11, the metallographic phase of the welding position of the valve seat 11 and the stud head 12 is changed, and the circular welding position of the valve seat 11, resulting in poor precision, use stability and cleanliness of the valve body.
Disclosure of Invention
The invention aims to at least solve one of the technical problems in the prior art, and provides a semi-closed welding protection device for a to-be-welded part, which can improve the precision, the use stability and the cleanliness of the semi-closed to-be-welded part after welding and improve the welding yield of the semi-closed to-be-welded part.
The welding protection device comprises a gas transmission pipe fitting, a first adjusting part and a backflow pressure maintaining assembly, wherein one end of the gas transmission pipe fitting is communicated with a protective gas source for providing protective gas through the first adjusting part, and the other end of the gas transmission pipe fitting penetrates through the backflow pressure maintaining assembly and extends into a semi-closed inner cavity of the semi-closed part to be welded so as to transmit the protective gas into the semi-closed inner cavity; the first adjusting component is used for adjusting the flow of the protective gas provided by the protective gas source;
the backflow pressure maintaining assembly is communicated with the atmosphere and the semi-closed inner cavity respectively, so that the protective gas entering the semi-closed inner cavity can flow back to the backflow pressure maintaining assembly, internal pressure is formed in the backflow pressure maintaining assembly, and the backflow pressure maintaining assembly is further communicated with a pressure measuring device capable of detecting the internal pressure.
Preferably, the backflow pressure maintaining assembly comprises a backflow pipe fitting, a pressure maintaining throttling component and a first connecting component, wherein the gas transmission pipe fitting penetrates through the backflow pipe fitting, one end of the backflow pipe fitting is clamped and sleeved outside the gas transmission pipe fitting, and the other end of the backflow pipe fitting is communicated with the semi-closed inner cavity;
the pressure maintaining throttling component is respectively communicated with the atmosphere and the backflow pipe fitting and is used for discharging the protective gas which flows back into the backflow pipe fitting and throttling the protective gas discharged from the backflow pipe fitting so as to form the internal pressure in the backflow pipe fitting;
the first connecting part is in communication with the return line and is adapted to be in communication with the pressure measurement device.
Preferably, the pressure maintaining throttling component comprises a pressure maintaining throttling pipe fitting, one end of the pressure maintaining throttling pipe fitting is communicated with the backflow pipe fitting, the other end of the pressure maintaining throttling pipe fitting is communicated with the atmosphere, and the inner diameter of the pressure maintaining throttling pipe fitting is smaller than that of the backflow pipe fitting.
Preferably, a communication portion between the first connection member and the return pipe is located closer to the other end of the return pipe than a communication portion between the pressure-maintaining throttling member and the return pipe.
Preferably, the backflow pressure maintaining assembly further comprises a plugging component, and the plugging component is detachably connected with the first connecting component and used for plugging the first connecting component.
Preferably, the backflow pressure maintaining assembly further comprises a second connecting part, the second connecting part is arranged at one end of the backflow pipe fitting, and the gas transmission pipe fitting penetrates through the second connecting part and extends into the backflow pipe fitting and is connected with the second connecting part in a sealing mode.
Preferably, the gas transmission pipe fitting comprises a first pipe part, a second pipe part and a third pipe part which are sequentially connected, a first channel, a second channel and a third channel which are sequentially communicated are arranged in the second connecting part, wherein the radial length of the first pipe part is greater than that of the third pipe part, and the radial length of the second pipe part is gradually reduced from the first pipe part to the third pipe part;
the radial length of the second channel is greater than that of the third channel, the radial length of the first channel is gradually reduced from one end far away from the second channel to the other end connected with the second channel, and the inner contour of the first channel is matched and sealed with the second pipe part;
the third pipe part penetrates through the third channel and extends into the backflow pipe fitting.
Preferably, the backflow pressure maintaining assembly further comprises a second adjusting component, and the second adjusting component is arranged on the pressure maintaining throttling pipe fitting and is used for adjusting the flow discharged through the pressure maintaining throttling pipe fitting.
Preferably, the second adjustment member comprises a needle valve.
Preferably, the shielding gas comprises argon, and/or the semi-enclosed to-be-welded piece comprises a semi-enclosed valve body within a mass flow controller.
The invention has the following beneficial effects:
the welding protection device of the semi-closed type piece to be welded provided by the invention can convey the protective gas provided by the protective gas source to the semi-closed inner cavity of the semi-closed type piece to be welded by the gas transmission pipe fitting before the semi-closed type piece to be welded is welded, the protective gas entering the semi-closed inner cavity is refluxed to the semi-closed inner cavity by the reflux pressure maintaining assembly respectively communicated with the atmosphere and the semi-closed inner cavity to form internal pressure, the flow of the protective gas provided by the protective gas source is regulated by the first regulating part to regulate the flow of the protective gas flowing from the protective gas source to the gas transmission pipe fitting, and the internal pressure in the reflux pressure maintaining assembly is detected by the pressure measuring device communicated with the reflux pressure maintaining assembly and capable of detecting the internal pressure, so that the internal pressure in the reflux pressure maintaining assembly meets the pressure required by the welding process, and the internal pressure in the semi-closed inner cavity communicated with the reflux pressure maintaining assembly meets the pressure required by the welding process, when a semi-closed type piece to be welded is welded, the metallographic phase of the semi-closed type piece to be welded is prevented from changing by means of the cooling capacity of the protective gas, welding impurities are prevented from being generated inside the semi-closed type piece to be welded, internal pressure generated in a semi-closed inner cavity by means of the protective gas keeps balance between internal pressure and external pressure of the semi-closed type piece to be welded, unevenness of a welding position of the semi-closed type piece to be welded is avoided, accuracy of the semi-closed type piece to be welded after welding can be improved, use stability and cleanliness are improved, and welding yield of the semi-closed type piece to be welded is improved.
Drawings
FIG. 1 is a schematic structural diagram of a semi-closed valve body applied to a mass flow controller in the prior art;
fig. 2 is a schematic view of the welding protection device of the semi-closed type part to be welded according to the embodiment of the invention, which is matched with the semi-closed type part to be welded when the semi-closed type part to be welded is not welded;
fig. 3 is a schematic view of a welding protection device of a semi-closed type part to be welded, which is provided by the embodiment of the invention, and is matched with the semi-closed type part to be welded when the semi-closed type part to be welded is welded;
fig. 4 is a schematic structural view of a gas transmission pipe of the welding protection device for a semi-closed to-be-welded part according to the embodiment of the invention;
fig. 5 is a schematic structural diagram of a reflow pressure maintaining assembly of a semi-enclosed welding protection device for a to-be-welded component according to an embodiment of the present invention;
description of reference numerals:
11-a valve seat; 12-stud head; 13-a channel; 21-gas transmission pipe fittings; 211-a first tube part; 212-a second tube portion; 213-a third tube portion; 22-a first adjustment member; 23-a return pipe; 24-pressure maintaining throttle pipe fittings; 25-a first connecting member; 26-a second connecting member; 261-a first channel; 262-a second channel; 263 — third channel; 27-a second adjustment member; 28-a blocking member; 31-semi-closed parts to be welded; 32-a protective gas source; 33-a pressure measuring device; 34-a welding machine; 35-welding pins.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the welding protection device of the semi-closed member to be welded provided by the present invention is described in detail below with reference to the accompanying drawings.
As shown in fig. 2, the present embodiment provides a welding protection device for a semi-closed workpiece to be welded 31, which includes a gas transmission pipe 21, a first adjusting member 22 and a backflow pressure maintaining assembly, wherein one end of the gas transmission pipe 21 is communicated with a shielding gas source 32 for providing shielding gas through the first adjusting member 22, and the other end of the gas transmission pipe penetrates through the backflow pressure maintaining assembly and extends into a semi-closed inner cavity of the semi-closed workpiece to be welded 31, so as to transmit the shielding gas into the semi-closed inner cavity; the first regulating component 22 is used for regulating the flow of the shielding gas provided by the shielding gas source 32; the backflow pressure maintaining assembly is communicated with the atmosphere and the semi-closed inner cavity respectively, so that protective gas entering the semi-closed inner cavity can flow back to the backflow pressure maintaining assembly, internal pressure is formed in the backflow pressure maintaining assembly, and the backflow pressure maintaining assembly is further communicated with a pressure measuring device 33 capable of detecting the internal pressure.
Before the semi-closed member 31 to be welded is welded, the welding protection device of the semi-closed member 31 to be welded provided in this embodiment may deliver shielding gas provided by a shielding gas source to the semi-closed inner cavity of the semi-closed member 31 to be welded by the gas delivery pipe member 21, reflux the shielding gas entering the semi-closed inner cavity to the semi-closed inner cavity by the reflux pressure maintaining assembly respectively communicated with the atmosphere and the semi-closed inner cavity, form an internal pressure therein, regulate the flow rate of the shielding gas provided by the shielding gas source 32 by the first regulating member 22 to regulate the flow rate of the shielding gas flowing from the shielding gas source 32 to the gas delivery pipe member 21, and detect the internal pressure in the reflux pressure maintaining assembly by the pressure measuring device 33 communicated with the reflux pressure maintaining assembly and capable of detecting the internal pressure, so that the internal pressure in the reflux pressure maintaining assembly satisfies the pressure required by the welding process, thereby make the interior pressure in the semi-closed inner chamber with backward flow pressurize subassembly intercommunication satisfy the required pressure of welding process, when waiting to weld piece 31 to semi-closed, avoid semi-closed to wait to weld the metallography of piece 31 to change with the help of protective gas's cooling capacity, avoid semi-closed to wait to weld the inside of piece 31 and produce welding impurity, and with the help of protective gas's interior pressure that produces in semi-closed inner chamber, make semi-closed wait to weld the inside and outside pressure of piece 31 keep balance, avoid semi-closed to wait to weld the welded junction unevenness behind piece 31, and then can improve the semi-closed precision of waiting to weld piece 31 after the welding, stability in use and cleanliness factor, improve the semi-closed welding yield of waiting to weld piece 31.
The welding protection device for the semi-closed workpiece to be welded 31 provided by the embodiment can be suitable for protecting the welding of the workpiece, the inner part of which is provided with the inner cavity, and the inner cavity is only provided with the opening which can be communicated with the external atmosphere. As shown in fig. 2, before the semi-closed member 31 to be welded is welded, the backflow pressure maintaining assembly may be connected to an open end of a semi-closed cavity of the semi-closed member 31 to be welded, such that the backflow pressure maintaining assembly is communicated with the semi-closed cavity of the semi-closed member 31 to be welded, one end of the gas transmission pipe 21 is communicated with the shielding gas source 32 for providing shielding gas through the first adjusting member 22, and the other end of the gas transmission pipe penetrates through the backflow pressure maintaining assembly, and extends into the semi-closed cavity of the semi-closed member 31 to be welded through an opening of the semi-closed cavity of the semi-closed member 31 to be welded, and the pressure measuring device 33 is mounted on the backflow pressure maintaining assembly, such that the pressure measuring device 33 is communicated.
Then, the protective gas source 32 is opened, so that the protective gas provided by the protective gas source 32 sequentially passes through the first adjusting component 22 and the gas transmission pipe fitting 21 and is transmitted into the semi-closed inner cavity of the semi-closed workpiece 31, because the semi-closed inner cavity only has one opening capable of being communicated with the external atmosphere, when the semi-closed inner cavity is filled with the protective gas, the protective gas overflows from the opening of the semi-closed inner cavity and flows back to the reflux pressure maintaining component communicated with the semi-closed inner cavity, after the protective gas overflows and flows back to the reflux pressure maintaining component, the protective gas is discharged to the atmosphere from the reflux pressure maintaining component, so that the protective gas can continuously flow into the semi-closed inner cavity from the protective gas source 32, meanwhile, the reflux pressure maintaining component can enable the protective gas flowing into the semi-closed inner cavity to form internal pressure therein, and because the reflux pressure maintaining component is communicated with the semi-closed inner cavity, the internal, after overflowing and flowing back to the reflux pressure maintaining assembly, the protective gas also flows to a pressure measuring device 33 communicated with the reflux pressure maintaining assembly so as to detect the internal pressure in the reflux pressure maintaining assembly by the pressure measuring device 33, the flow of shielding gas provided by the shielding gas source 32 is regulated by adjusting the first regulating member 22, to regulate the flow of shield gas from the shield gas source 32 into the gas delivery tube 21, thereby regulating the flow of the protective gas flowing into the semi-closed inner cavity, when the internal pressure in the reflux pressure maintaining assembly detected by the pressure measuring device 33 meets the welding process requirement, that is, when the internal pressure in the semi-closed inner cavity satisfies the welding process requirement, the adjustment of the first adjustment member 22 is stopped, so that the internal pressure in the semi-closed inner cavity is maintained at the pressure currently satisfying the welding process requirement, and then the semi-closed member to be welded 31 can be welded.
In this embodiment, after the semi-closed member to be welded 31 is welded, the internal pressure in the semi-closed inner cavity of the subsequent other semi-closed member to be welded 31 can be adjusted according to the welding effect of the semi-closed member to be welded 31, so as to improve the welding effect of the subsequent other semi-closed member to be welded 31, for example, after the semi-closed member to be welded 31 is welded, if the welding position of the semi-closed member to be welded 31 protrudes outward, it indicates that the internal pressure in the semi-closed inner cavity of the semi-closed member to be welded 31 is higher than the external pressure thereof during welding, when the subsequent other semi-closed member to be welded 31 is welded, the internal pressure in the semi-closed inner cavity of the subsequent other semi-closed member to be welded 31 can be adjusted to be lower, so that the internal pressure in the semi-closed inner cavity is balanced with the external pressure of the semi-closed member to be welded 31, and if the welding position of the semi-closed, when the semi-closed member to be welded 31 is welded, the internal pressure in the semi-closed inner cavity is lower than the external pressure, so that when the subsequent other semi-closed member to be welded 31 is welded, the internal pressure in the semi-closed inner cavity of the subsequent other semi-closed member to be welded 31 can be increased, and the internal pressure in the semi-closed inner cavity is balanced with the external pressure of the semi-closed member to be welded 31.
In a preferred embodiment of the present invention, the shielding gas may include argon.
Alternatively, the semi-closed member to be welded 31 may include a semi-closed valve body in a mass flow controller.
As shown in fig. 2, in a preferred embodiment of the present invention, the backflow pressure maintaining assembly may include a backflow pipe 23, a pressure maintaining throttling component and a first connecting component 25, wherein the gas transmission pipe 21 penetrates through the backflow pipe 23, one end of the backflow pipe 23 is clamped outside the gas transmission pipe 21, and the other end of the backflow pipe 23 is communicated with the semi-closed inner cavity; the pressure maintaining throttling part is respectively communicated with the atmosphere and the backflow pipe fitting 23, and is used for discharging the protective gas which flows back into the backflow pipe fitting 23 and throttling the protective gas discharged from the backflow pipe fitting 23 to form internal pressure in the backflow pipe fitting 23; the first connecting part 25 communicates with the return pipe 23 and is adapted to communicate with a pressure measuring device 33.
The following description will take the welding protection device of the semi-closed member to be welded 31 provided in this embodiment as an example for protecting the welding of the semi-closed valve body shown in fig. 1, as shown in fig. 1, the semi-closed valve body includes a valve seat 11 and a stud head 12, wherein a passage 13 penetrating through the valve seat 11 is provided in the valve seat 11, the stud head 12 is in interference fit with one end of the passage 13 to close one end of the passage 13, so as to semi-close the passage 13, and form a semi-closed inner cavity in the valve body.
As shown in fig. 2, before the semi-closed valve body is welded, one end of the backflow pipe 23 may be clamped and sleeved outside the gas transmission pipe 21, and the other end of the backflow pipe 23 is connected to the open end of the passage 13 of the valve seat 11, which is capable of communicating with the atmosphere, that is, the other end of the backflow pipe 23 is connected to the end of the passage 13 of the valve seat 11, which is not closed by the stud head 12, so that the other end of the backflow pipe 23 is communicated with the passage 13, that is, the other end of the backflow pipe 23 is communicated with the semi-closed inner cavity, one end of the gas transmission pipe 21 is communicated with the shielding gas source 32 for providing shielding gas through the first adjusting part 22, and at this time, one end of the gas transmission pipe 21 is communicated with the shielding gas source 32, and the. The first connection part 25 is provided on the return pipe member 23 and communicates with the inside of the return pipe member 23, and by mounting the pressure measuring device 33 to the first connection part 25, the pressure measuring device 33 communicates with the inside of the return pipe member 23 through the first connection part 25 to enable detection of the internal pressure of the return pipe member 23, that is, the internal pressure of the passage 13, since the return pipe member 23 communicates with the passage 13. The pressure-maintaining throttling member is provided on the return pipe member 23 and communicates with the atmosphere and the inside of the return pipe member 23, respectively, so that the protective gas overflowing into the return pipe member 23 can be discharged from the inside of the return pipe member 23, and the pressure-maintaining throttling member throttles the protective gas discharged from the return pipe member 23, that is, so that the flow rate of the protective gas discharged from the return pipe member 23 is smaller than the flow rate of the protective gas overflowing from the passage 13 and flowing back into the return pipe member 23, to form an internal pressure in the return pipe member 23.
Then the protective gas source 32 is opened, the protective gas provided by the protective gas source 32 passes through the first adjusting component 22 and the gas transmission pipe fitting 21 in sequence, and is transmitted into the channel 13, because the channel 13 only has one opening which can be communicated with the external atmosphere, after the channel 13 is filled with the protective gas, the protective gas overflows from the opening of the channel 13 and flows back into the backflow pipe fitting 23 communicated with the channel 13, after the protective gas overflows and flows back into the backflow pipe fitting 23, the protective gas is discharged from the pressure maintaining throttling component to the atmosphere through the backflow pipe fitting 23, so that the protective gas can continuously flow into the channel 13 from the protective gas source 32, meanwhile, the pressure maintaining throttling component throttles the protective gas discharged from the backflow pipe fitting 23, so that the protective gas flowing back into the backflow pipe fitting 23 forms internal pressure in the backflow pipe fitting 23, after the protective gas overflows and flows back into the backflow pipe fitting 23, the protective gas also flows to the pressure measuring device 33 through the first connecting component 25, the internal pressure in the backflow pipe fitting 23 is detected by the pressure measuring device 33, the flow of the protective gas provided by the protective gas source 32 is adjusted by adjusting the first adjusting part 22, the flow of the protective gas flowing from the protective gas source 32 to the gas transmission pipe fitting 21 is adjusted, and the flow of the protective gas flowing into the channel 13 is adjusted, when the internal pressure in the backflow pipe fitting 23 detected by the pressure measuring device 33, namely the internal pressure in the channel 13 meets the welding process requirement, the adjustment of the first adjusting part 22 is stopped, the internal pressure in the channel 13 is kept at the pressure meeting the welding process requirement at present, and then the semi-closed type workpiece 31 to be welded can be welded.
In a preferred embodiment of the present invention, the pressure measuring device 33 may include a pressure difference meter, which is communicated with the backflow pipe 23 through the first connecting component 25 and can detect the internal and external pressure differences of the semi-closed member to be welded 31, and the external pressure of the semi-closed member to be welded 31 is usually a known pressure, such as an atmospheric pressure, or a common pressure of an argon gas pressure and an atmospheric pressure during argon arc welding, so that the internal pressure of the semi-closed member to be welded 31 can be obtained through the internal and external pressure differences of the semi-closed member to be welded 31 detected by the pressure difference meter, and whether the internal and external pressures of the semi-closed member to be welded are balanced can be directly judged according to the internal and external pressure differences of the semi-closed member to be welded 31 detected by the pressure difference meter, so as to judge whether the internal pressure in the semi-closed inner.
As shown in fig. 3, alternatively, when welding the semi-enclosed valve body shown in fig. 1, a welder 34 and a welding pin 35 may be used to weld the valve seat 11 and the stud head 12.
As shown in fig. 2 and 5, in a preferred embodiment of the present invention, the pressure maintaining throttle member may include a pressure maintaining throttle pipe 24, one end of the pressure maintaining throttle pipe 24 is communicated with the return pipe 23, and the other end is communicated with the atmosphere, so as to realize that the pressure maintaining throttle member is respectively communicated with the atmosphere and the return pipe 23, and the inner diameter of the pressure maintaining throttle pipe 24 is smaller than the inner diameter of the return pipe 23, so as to realize throttling of the shielding gas discharged from the return pipe 23, that is, to make the flow rate of the shielding gas discharged from the return pipe 23 smaller than the flow rate of the shielding gas overflowing from the semi-closed inner cavity of the semi-closed member to be welded 31 and flowing back into the return pipe 23, so as to form an internal pressure in the return pipe.
As shown in fig. 2 and 5, in a preferred embodiment of the present invention, the communication between the first connection part 25 and the return pipe 23 may be close to the other end of the return pipe 23 relative to the communication between the pressure maintaining throttling part and the return pipe 23. Therefore, after the protective gas overflows and flows back to the backflow pipe fitting 23, the protective gas flows to the pressure measuring device 33 through the communication part of the first connecting part 25 and the backflow pipe fitting 23, and then is discharged to the atmosphere through the communication part of the pressure maintaining throttling part and the backflow pipe fitting 23, so that the waste of the protective gas is reduced, and the use cost of the welding protection device is reduced.
As shown in fig. 3, in a preferred embodiment of the present invention, the reflux pressure maintaining assembly may further include a blocking member 28, and the blocking member 28 is detachably coupled to the first connection member 25 to be coupled to the first connection member 25 for blocking the first connection member 25 when the first connection member 25 is not coupled to the pressure measuring device 33.
For example, when the internal pressure in the return pipe member 23 detected by the pressure measuring device 33, that is, the internal pressure of the passage 13 satisfies the welding process requirement and the adjustment of the first adjusting member 22 is stopped, the pressure measuring device 33 may be detached from the first connecting member 25, the blocking member 28 may be connected to the first connecting member 25, the first connecting member 25 may be blocked, the internal pressure in the semi-closed cavity of the semi-closed member to be welded 31 may be maintained at a pressure currently satisfying the welding process requirement, and then the semi-closed member to be welded 31 may be welded, so that the pressure measuring device 33 may be prevented from being damaged when the semi-closed member to be welded 31 is welded. Further, when the solder protector is not used, that is, when the pressure measuring device 33 is not attached to the first connection member 25, the blocking member 28 may be connected to the first connection member 25 to block the first connection member 25, so as to prevent contamination of the return pipe 23.
As shown in fig. 2 and 5, in a preferred embodiment of the present invention, the backflow pressure maintaining assembly may further include a second connection part 26, the second connection part 26 is disposed at one end of the backflow pipe member 23, and the gas pipe member 21 extends into the backflow pipe member 23 through the second connection part 26 and is hermetically connected to the second connection part 26.
The second connecting part 26 is connected with the gas transmission pipe fitting 21 in a sealing manner, so that the protective gas flowing into the backflow pipe fitting 23 from the semi-closed to-be-welded part 31 is prevented from flowing out from the space between the gas transmission pipe fitting 21 and the backflow pipe fitting 23, the waste of the protective gas is reduced, the use cost of the welding protection device is reduced, and the stability of the internal pressure in the backflow pipe fitting 23 can be improved.
As shown in fig. 4 and 5, in a preferred embodiment of the present invention, the gas pipe member 21 may include a first pipe portion 211, a second pipe portion 212, and a third pipe portion 213 connected in sequence, and a first passage 261, a second passage 262, and a third passage 263 connected in sequence are disposed in the second connection part 26, wherein the radial length of the first pipe portion 211 is greater than that of the third pipe portion 213, and the radial length of the second pipe portion 212 is gradually decreased from the first pipe portion 211 to the third pipe portion 213; the radial length of the second passage 262 is greater than that of the third passage 263, the radial length of the first passage 261 gradually decreases from the end away from the second passage 262 to the other end connected to the second passage 262, and the inner contour of the first passage 261 is fitted and sealed with the second pipe portion 212; the third pipe portion 213 extends through the third passage 263 into the return pipe member 23.
As shown in fig. 4 and 5, taking the gas transmission pipe 21 as a cylindrical pipe as an example, the first pipe portion 211 and the third pipe portion 213 are both cylindrical, the outer diameter of the first pipe portion 211 is larger than the outer diameter of the third pipe portion 213, the second pipe portion 212 is truncated cone-shaped, the end with the larger outer diameter of the second pipe portion 212 is connected to the first pipe portion 211, the end with the smaller outer diameter is connected to the third pipe portion 213, the inner profiles of the second passage 262 and the third passage 263 are both circular, the inner diameter of the second passage 262 is larger than the inner diameter of the third passage 263, the inner diameter of the first passage 261 gradually decreases from the end away from the second passage 262 to the other end connected to the second passage 262, when the gas transmission pipe 21 passes through the second connection part 26, the first pipe portion 211 is located outside the first passage 261, the third pipe portion 213 passes through the second passage 262 and the third passage 263 to reach the return pipe 23, the second pipe portion 212 reaches the first passage 261, and is fitted to the inner wall of the first passage 261 to seal between the gas delivery pipe member 21 and the second coupling member 26.
As shown in fig. 2 and 3, in a preferred embodiment of the present invention, the backflow holding pressure assembly may further include a second adjusting member 27, and the second adjusting member 27 is disposed on the holding pressure orifice pipe 24 and is used for adjusting the flow rate of the shielding gas discharged through the holding pressure orifice pipe 24.
Through adjusting the second adjusting part 27, can adjust the flow of the protective gas discharged through the pressure maintaining orifice fitting 24, in order to adjust the throttling capacity of the pressure maintaining orifice fitting 24, that is, adjust the flow of the protective gas discharged from the backflow fitting 23, thereby can adjust the internal pressure in the backflow fitting 23, and can reduce the waste of the protective gas, reduce the use cost of the welding protection device, in addition, through adjusting the first adjusting part 22 and the second adjusting part 27, all can adjust the internal pressure in the backflow fitting 23, thereby improve the flexibility of adjusting the internal pressure in the backflow fitting 23.
For example, if the flow rate of the protective gas discharged through the pressure maintaining orifice pipe 24 is decreased by adjusting the second adjusting member 27 to increase the throttling capacity of the pressure maintaining orifice pipe 24, the flow rate of the protective gas discharged from the return pipe 23 is decreased and the internal pressure in the return pipe 23 is increased, and if the flow rate of the protective gas discharged through the pressure maintaining orifice pipe 24 is increased by adjusting the second adjusting member 27 to decrease the throttling capacity of the pressure maintaining orifice pipe 24, the flow rate of the protective gas discharged from the return pipe 23 is increased and the internal pressure in the return pipe 23 is decreased. When the internal pressure in the return pipe 23, that is, the internal pressure in the semi-closed inner cavity, detected by the pressure measuring device 33 meets the requirements of the welding process, the adjustment of the first adjusting part 22 and the second adjusting part 27 is stopped, so that the internal pressure in the semi-closed inner cavity is maintained at the pressure currently meeting the requirements of the welding process.
In a preferred embodiment of the present invention, the second adjusting member 27 may include a needle valve.
In summary, the welding protection device for the semi-closed to-be-welded component 31 provided in the embodiment of the present invention can improve the precision, the use stability and the cleanliness of the semi-closed to-be-welded component 31, and improve the yield of the semi-closed to-be-welded component 31.
It is to be understood that the above embodiments are merely exemplary embodiments that have been employed to illustrate the principles of the present invention, and that the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. The welding protection device for the semi-closed type to-be-welded part is characterized by comprising a gas transmission pipe fitting, a first adjusting part and a backflow pressure maintaining assembly, wherein one end of the gas transmission pipe fitting is communicated with a protective gas source for providing protective gas through the first adjusting part, and the other end of the gas transmission pipe fitting penetrates through the backflow pressure maintaining assembly and extends into a semi-closed inner cavity of the semi-closed type to-be-welded part so as to convey the protective gas into the semi-closed inner cavity; the first adjusting component is used for adjusting the flow of the protective gas provided by the protective gas source;
the backflow pressure maintaining assembly is communicated with the atmosphere and the semi-closed inner cavity respectively, so that the protective gas entering the semi-closed inner cavity can flow back to the backflow pressure maintaining assembly, internal pressure is formed in the backflow pressure maintaining assembly, and the backflow pressure maintaining assembly is further communicated with a pressure measuring device capable of detecting the internal pressure.
2. The semi-closed welding protection device for the workpiece to be welded according to claim 1, wherein the backflow pressure maintaining assembly comprises a backflow pipe, a pressure maintaining throttling component and a first connecting component, wherein the gas transmission pipe penetrates through the backflow pipe, one end of the backflow pipe is clamped outside the gas transmission pipe, and the other end of the backflow pipe is communicated with the semi-closed inner cavity;
the pressure maintaining throttling component is respectively communicated with the atmosphere and the backflow pipe fitting and is used for discharging the protective gas which flows back into the backflow pipe fitting and throttling the protective gas discharged from the backflow pipe fitting so as to form the internal pressure in the backflow pipe fitting;
the first connecting part is in communication with the return line and is adapted to be in communication with the pressure measurement device.
3. The semi-closed welding protection device for a workpiece to be welded according to claim 2, wherein the pressure maintaining throttling component comprises a pressure maintaining throttling pipe, one end of the pressure maintaining throttling pipe is communicated with the backflow pipe, the other end of the pressure maintaining throttling pipe is communicated with the atmosphere, and the inner diameter of the pressure maintaining throttling pipe is smaller than that of the backflow pipe.
4. The welding protection device of a semi-closed member to be welded according to claim 2, wherein a communication between the first connection member and the return pipe member is located near the other end of the return pipe member with respect to a communication between the pressure-holding throttling member and the return pipe member.
5. A semi-enclosed weld protection device for a member to be welded according to claim 2, wherein the reflow pressure maintaining assembly further comprises a blocking member detachably connected to the first connection member for blocking the first connection member.
6. The semi-enclosed welding protection device for workpieces to be welded according to claim 2, wherein the reflow pressure maintaining assembly further comprises a second connecting part, the second connecting part is arranged at one end of the reflow pipe fitting, and the gas transmission pipe fitting penetrates through the second connecting part and extends into the reflow pipe fitting and is connected with the second connecting part in a sealing manner.
7. The semi-enclosed welding protection device for a workpiece to be welded according to claim 6, wherein the gas transmission pipe fitting comprises a first pipe portion, a second pipe portion and a third pipe portion which are sequentially connected, a first channel, a second channel and a third channel which are sequentially communicated are arranged in the second connecting portion, wherein the radial length of the first pipe portion is larger than that of the third pipe portion, and the radial length of the second pipe portion is gradually reduced from the first pipe portion to the third pipe portion;
the radial length of the second channel is greater than that of the third channel, the radial length of the first channel is gradually reduced from one end far away from the second channel to the other end connected with the second channel, and the inner contour of the first channel is matched and sealed with the second pipe part;
the third pipe part penetrates through the third channel and extends into the backflow pipe fitting.
8. The semi-enclosed weld protection device for a member to be welded according to claim 3, wherein the reflow pressure maintaining assembly further comprises a second regulating member provided on the pressure maintaining orifice fitting for regulating the flow rate discharged through the pressure maintaining orifice fitting.
9. The weld protection device of a semi-enclosed member to be welded according to claim 8, wherein the second adjustment member comprises a needle valve.
10. A semi-enclosed weld protection device for a part to be welded according to claim 1, wherein the shielding gas comprises argon gas, and/or the semi-enclosed part to be welded comprises a semi-enclosed valve body within a mass flow controller.
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| CN202011561018.0A CN112743207B (en) | 2020-12-25 | 2020-12-25 | Semi-closed welding protection device for parts to be welded |
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| CN202011561018.0A CN112743207B (en) | 2020-12-25 | 2020-12-25 | Semi-closed welding protection device for parts to be welded |
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| CN112743207B CN112743207B (en) | 2022-09-23 |
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| CN112743207B (en) | 2022-09-23 |
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