Liquid nitrogen gasifier and welding system

Abstract

The utility model relates to a liquid nitrogen vaporizer and a welding system, and relates to the technical field of welding equipment, the liquid nitrogen vaporizer comprises a frame body, heat exchange pipes and heat exchange pieces, the heat exchange pipes are distributed in the frame body in an S-shaped trend and comprise straight pipe sections and bent pipe sections which are sequentially connected end to end, and each heat exchange pipe is provided with an inlet end and an outlet end; the inlet end and the outlet end are arranged above the frame body along opposite angles; the heat exchange pieces are arranged on the straight pipe sections and used for transferring external heat to the heat exchange pipes. According to the liquid nitrogen gasifier, the temperature returning effect is better, the possibility that the air inlet of the heat exchange pipe is frostbitten can be reduced, it is guaranteed that when nitrogen enters welding equipment, the process temperature requirement can be met, and economic losses are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of welding equipment, in particular to a liquid nitrogen gasifier and a welding system. BACKGROUND

[0002] Nitrogen has a relatively wide application in the field of welding technology, for example, nitrogen can prevent oxidation of chips and frames in reflow soldering, and can also prevent oxidation during preheating, welding or cooling, thereby improving the welding quality.

[0003] In actual use, a liquid nitrogen storage tank is usually used to supply nitrogen to the welding equipment. Since nitrogen elements exist in the form of liquid nitrogen in the liquid nitrogen storage tank, a conversion process is required to convert the liquid nitrogen into nitrogen gas. In the related art, a relatively long heat exchange pipe is arranged between the liquid nitrogen storage tank and the welding equipment to allow the nitrogen elements to be warmed up in the pipe. However, this way has poor warming effect, which causes the gas inlet of the heat exchange pipe to be easily frozen, and the heat exchange pipe needs to be frequently replaced. In addition, the welding equipment needs to consume higher energy to reach the process temperature requirement, which causes great economic loss to the production.

[0004] Therefore, there is an urgent need to provide a transfer equipment with good warming effect to reduce the use cost in the welding process. CONTENT OF THE INVENTION

[0005] The present application provides a liquid nitrogen gasifier, which has good warming effect, can reduce the possibility of freezing the gas inlet of the heat exchange pipe, ensure that the nitrogen gas can reach the process temperature requirement when entering the welding equipment, and reduce economic loss.

[0006] In a first aspect, the present application provides a liquid nitrogen gasifier adopting the following technical solution:

[0007] A liquid nitrogen gasifier comprises:

[0008] a frame;

[0009] a heat exchange pipe, which is arranged in the frame in an S-shaped manner and comprises straight pipe sections and elbow pipe sections connected in sequence, the heat exchange pipe has an inlet end and an outlet end, and the inlet end and the outlet end are arranged diagonally above the frame;

[0010] a heat exchange fin arranged on the straight pipe section and used for transferring external heat to the heat exchange pipe.

[0011] Further, the heat exchange fin is provided in plurality, and the plurality of heat exchange fins are arranged around the straight pipe section.

[0012] Further, a fixing member is connected between adjacent straight pipe sections.

[0013] Further, the fixing member comprises a plurality of fixing pieces, the plurality of fixing pieces are uniformly distributed along the length direction of the straight pipe section, and both ends of the fixing piece are connected to the corresponding straight pipe section through the heat exchange piece.

[0014] Further, an end of the fixing piece is provided with a protruding portion, the protruding portion is arranged in the pressing groove, and the heat exchange piece is clamped or riveted with the fixing piece through the protruding portion.

[0015] Further, the heat exchange piece is made of a metal material.

[0016] Further, the bottom of the frame body is provided with a pulley.

[0017] In the second aspect, the application provides a welding system, comprising the liquid nitrogen gasifier.

[0018] In summary, the application has at least one of the following beneficial technical effects:

[0019] 1. The heat exchange pipe in the application is arranged in the frame body in an S-shaped manner, so that the heat exchange pipe has a longer length while occupying a smaller space, and the adjacent pipe sections of the heat exchange pipe maintain a proper distance, which not only guarantees the heat transfer effect, but also makes the space layout of the gasification station more compact, occupies a smaller space, and is convenient to move.

[0020] 2. The heat exchange pipe in the application is provided with a plurality of heat exchange pieces, which further provide a larger heat exchange area when the heat exchange pipe exchanges heat with the outside, can fully absorb the external heat to transfer to the heat exchange pipe, thereby increasing the heat exchange efficiency.

[0021] 3. The application is provided with a fixing member to fix the heat exchange pipe, so as to improve the stability of the heat exchange pipe and reduce the possibility of shaking of the heat exchange pipe when moving the gasification station. At the same time, the arrangement of the fixing member also makes the gasification station as a whole in a multi-grid arrangement. When the nitrogen element flows in the heat exchange pipe, the fixing piece connects the front end part, the middle section and the tail section of the heat exchange pipe well to conduct heat, so that the temperature recovery effect of the heat exchange pipe can be further improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a perspective view of the liquid nitrogen gasifier in the application;

[0023] Figure 2 is a top view of the liquid nitrogen gasifier in the application;

[0024] Figure 3 is a perspective view of the liquid nitrogen gasifier in the application;

[0025] Figure 4 is Figure 3 is a partial enlarged view of part A in figure

[0026] In the figure, 1 is a frame body; 2 is a heat exchange pipe; 21 is an inlet end; 22 is an outlet end; 23 is a straight pipe section; 24 is a bent pipe section; 3 is a heat exchange fin; 31 is a protruding part; 4 is a fixing part; 41 is a fixing fin; 411 is a pressing groove. DETAILED DESCRIPTION

[0027] The technical solutions of the present application will be described in detail below with reference to the accompanying drawings. Figures 1-4 The following examples are illustrative only and are not intended to limit the present application. In the following description, the same reference numbers refer to the same or similar elements throughout the description of the drawings.

[0028] In the description of the present application, it should be understood that the terms "upper", "lower", "inner", "outer", "left", "right", etc. indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the present application is used, or the orientation or positional relationship commonly understood by those skilled in the art, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0029] In addition, the terms "mounting", "connecting", "connecting" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] It should be further understood that the term "and / or" used in the specification and corresponding claims of the present application means any combination of one or more of the listed items and all possible combinations.

[0031] A welding system comprises a liquid nitrogen storage tank, a liquid nitrogen gasifier and a welding device, the liquid nitrogen storage tank is connected with the welding device through the liquid nitrogen gasifier, and the liquid nitrogen in the liquid nitrogen storage tank flows through the liquid nitrogen gasifier and enters the welding device in the form of normal temperature nitrogen gas, thereby providing an inert gas environment for the welding process.

[0032] The specific connection form between the liquid nitrogen storage tank, the liquid nitrogen gasifier and the welding equipment can be set according to actual needs. In a specific embodiment, the liquid nitrogen storage tank and the welding equipment can be directly connected with the liquid nitrogen gasifier, and in another specific embodiment, a connecting pipe can be further added for connection. Both ways have good temperature recovery effect.

[0033] With reference to Figure 1 and Figure 2 , the liquid nitrogen gasifier comprises a frame 1 and a heat exchange pipe 2, wherein the heat exchange pipe 2 has an inlet end 21 and an outlet end 22, and the inlet end 21 and the outlet end 22 are arranged diagonally above the frame 1. Further, the heat exchange pipe 2 is arranged in the frame 1 in an S-shaped manner.

[0034] Specifically, the heat exchange pipe 2 comprises straight pipe sections 23 and elbow pipe sections 24 connected in sequence, and a plurality of straight pipe sections 23 and elbow pipe sections 24 are arranged, and the straight pipe sections 23 and the elbow pipe sections 24 are connected together by welding, so as to facilitate the arrangement of the heat exchange pipe 2 according to the actual space size in the frame 1.

[0035] In a specific embodiment, the straight pipe sections 23 are arranged vertically (i.e. along the height direction of the frame 1), and the elbow pipe sections 24 are arranged in 11 sections to connect adjacent straight pipe sections 23, and the final arrangement of the heat exchange pipe 2 is shown in the figure.

[0036] Through this arrangement, the heat exchange pipe 2 has a longer length while occupying a smaller space, and the adjacent heat exchange pipes 2 maintain a suitable distance, which not only guarantees the heat transfer effect, but also makes the space layout of the gasification station more compact, occupies less space, and is also convenient to move.

[0037] Further, in a specific embodiment, pulleys can be installed at the bottom of the frame 1 to make the gasifier more convenient to move. In another specific embodiment, a mobile platform can also be installed at the bottom of the frame 1 to drive the gasifier to move automatically by electric drive or the like, so that it is more convenient to use the gasification station.

[0038] With reference to Figure 1 and Figure 2 , the gasifier further comprises heat exchange fins 3 arranged on each straight pipe section 23. The heat exchange fins 3 on the straight pipe sections 23 located in the inner circle of the frame 1 are connected to the frame 1 by welding, thereby fixing the heat exchange pipe 2, and when the heat exchange pipe 2 exchanges heat with the outside, the heat exchange fins 3 further provide a larger heat exchange area, thereby increasing the heat exchange efficiency.

[0039] The heat exchange sheet 3 is made of metal material, and in a specific embodiment, the heat exchange sheet 3 is made of aluminum plate which has good heat conductivity. When the nitrogen element flows in the heat exchange pipe 2, the heat exchange sheet 3 can absorb the external heat well and accelerate the temperature rise of the nitrogen element.

[0040] Further, the heat exchange sheet 3 is provided in plurality, and the plurality of heat exchange sheets 3 are arranged around the straight pipe section 23. In a specific embodiment, the number of the heat exchange sheet 3 is preferably 8, and the heat exchange area provided by the 8 heat exchange sheets 3 can significantly improve the temperature of the nitrogen element.

[0041] It is detected that when the nitrogen element in the form of liquid nitrogen enters from the inlet end 21, the temperature is -200±10℃, and when the nitrogen element flows out from the outlet end 22, it is completely converted into nitrogen gas, and the temperature of the nitrogen gas is normal temperature, which has excellent temperature recovery effect.

[0042] In addition, considering the need to use the gasifier in cold weather, in a specific embodiment, heating wires can also be arranged on the heat exchange sheet 3 to assist the temperature recovery of the nitrogen element. It should be noted that the heating wires need to be arranged at the end of the heat exchange sheet 3 away from the heat exchange pipe 2, and the power of the heating wires can be adjusted to reduce the possibility of explosion due to sudden increase of gas pressure in the straight pipe section 23 when the temperature of a certain heat exchange sheet 3 is too high.

[0043] Embodiment 2:

[0044] With reference to Figure 3 and Figure 4 The difference between this embodiment 2 and the embodiment 1 is that the fixed part 4 is connected between the adjacent straight pipe sections 23. By arranging the fixed part 4, the heat exchange pipe 2 can be better fixed in the frame 1 to improve the stability of the heat exchange pipe 2 and reduce the possibility of shaking of the heat exchange pipe 2 when moving the gasification station.

[0045] Specifically, the fixed part 4 includes a plurality of fixed sheets 41 (preferably two in this embodiment, and in other embodiments, the number of the fixed sheets 41 can be further increased), and the plurality of fixed sheets 41 are uniformly distributed along the length direction of the straight pipe section 23. The two ends of the fixed sheet 41 are connected to the corresponding straight pipe section 23 through the heat exchange sheet 3, and the two ends of the fixed sheet 41 are provided with a pressing groove 411. Correspondingly, the end of the fixed sheet 41 away from the straight pipe section 23 is provided with a protruding part 31.

[0046] In a specific embodiment, the protruding part 31 is placed in the pressing groove 411, and the fixed sheet 41 and the heat exchange sheet 3 are tightly connected together by pressure riveting, which is stable and reliable.

[0047] In another specific embodiment, the protrusion 31 is placed in the pressing groove 411, and the fixing sheet 41 is connected to the heat exchange sheet 3 by means of clamping (for example, the protrusion 31 is tightly fitted with the groove wall of the pressing groove 411, or is fixed by a latch).

[0048] Both of the two ways can better fix the heat exchange pipe 2.

[0049] Meanwhile, the arrangement of the fixing member 4 also makes the gasification station as a whole in a multi-rectangular grid arrangement. In a specific embodiment, the fixing sheet 41 and the heat exchange sheet 3 are both made of aluminum plates. When nitrogen flows through the heat exchange pipe 2, the heat exchange pipe 2 can be simply divided into a front section, a middle section, and a tail section. The fixing sheet 41 connects and conducts heat between the front section, the middle section, and the tail section, so that the temperature recovery effect of the heat exchange pipe 2 can be further improved.

[0050] The embodiments of the specific embodiments are the preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same parts are indicated by the same reference numerals. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A liquid nitrogen vaporizer characterized by, It includes: Frame (1); Heat exchange pipe (2), which is arranged in the frame (1) in an S-shaped manner, including straight pipe section (23) and elbow pipe section (24) connected in sequence, the heat exchange pipe (2) has an inlet end (21) and an outlet end (22), the inlet end (21) and the outlet end (22) are arranged diagonally above the frame (1); Heat exchange fin (3) is arranged on the straight pipe section (23) for transferring external heat to the heat exchange pipe (2).

2. A liquid nitrogen vaporizer as claimed in claim 1, wherein, The heat exchange fin (3) is provided with a plurality of heat exchange fins (3) which are arranged around the straight pipe section (23).

3. A liquid nitrogen vaporizer as claimed in claim 1, wherein, The adjacent straight pipe sections (23) are connected by a fixing piece (4).

4. A liquid nitrogen vaporizer as claimed in claim 3, wherein, The fixing piece (4) includes a plurality of fixing pieces (41), and the plurality of fixing pieces (41) are uniformly distributed along the length direction of the straight pipe section (23), and the two ends of the fixing piece (41) are connected to the corresponding straight pipe section (23) through the heat exchange fin (3).

5. A liquid nitrogen vaporizer as claimed in claim 4, wherein, The end of the fixing piece (41) is provided with a pressing groove (411), and the end of the fixing piece (41) away from the straight pipe section (23) is provided with a protruding part (31), the protruding part (31) is arranged in the pressing groove (411), and the heat exchange fin (3) is connected with the fixing piece (41) through the protruding part (31).

6. A liquid nitrogen vaporizer as claimed in any one of claims 1 to 5, wherein, The heat exchange fin (3) is made of metal material.

7. The liquid nitrogen vaporizer of claim 1, wherein, The bottom of the frame (1) is provided with a pulley.

8. A welding system characterized by, The liquid nitrogen gasifier of any one of claims 1-7.

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