Back protection tool for plate heat exchanger plate tube and tooth plate welding

Abstract

The utility model discloses a kind of back protection tool for plate heat exchanger plate tube and tooth plate welding, including air inlet pipe and gas blowing shell;The air inlet pipe is communicated with gas blowing shell, and the one end opening of gas blowing shell is provided with protruding part close to the opening, and the protruding part has multiple Y-shaped grooves matched with plate tube edge.The utility model can effectively protect the back of weld, prevent the back weld from directly contacting air oxidation, is easy to operate, the device can be reused, effectively reduces the preparation time before welding, and the back protection effect is good.

Description

Technical Field

[0001] This utility model relates to the field of welding auxiliary equipment technology, specifically a back protection tool for welding plate tubes and toothed plates of a plate heat exchanger. Background Technology

[0002] Currently, plate heat exchangers are widely used in many industrial and civil applications due to their high efficiency, compactness, and flexibility, especially in situations with strict requirements for cooling fluids, such as central air conditioning systems, systems with expensive or special cooling media, or in arid or semi-arid regions or areas with scarce water resources. The core components of plate heat exchangers are mostly made of Fe-IV type materials, and the plate thickness is mostly in the range of 0.8-2.5mm. For example, the patent with authorization announcement number CN103143817B discloses a welding method for the plate tube and toothed plate of a plate evaporative heat exchanger. When using argon arc welding to weld the plate tube and toothed plate, it is necessary to protect the back of the weld to prevent the back weld from directly contacting the air for oxidation. The weld of the plate tube and toothed plate joint is an important part of the core of the plate heat exchanger, and the quality of the weld directly affects the performance of the plate heat exchanger. The back protection tooling for the plate tube and toothed plate weld is crucial to the weld quality. Therefore, a back protection tooling for welding the plate tube and toothed plate of a plate heat exchanger is proposed. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the existing defects and provide a back protection tool for welding plate tubes and toothed plates of plate heat exchangers. It can effectively protect the back of the weld and prevent the back weld from being directly exposed to air and oxidizing. It is easy to operate, the device can be reused, effectively reduces the pre-welding preparation time, and has a good back protection effect, which can effectively solve the problems in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a back protection tool for welding plate tubes and toothed plates of a plate heat exchanger, comprising an air inlet pipe and an air blowing shell; the air inlet pipe is connected to the air blowing shell, one end of the air blowing shell is open, and the air blowing shell has a protrusion near the opening, the protrusion having multiple Y-shaped grooves adapted to the edge of the plate tube.

[0005] Preferably, the air-blowing housing includes a cover plate, a sealing plate, and a bottom plate. The cover plate and the bottom plate are arranged parallel to each other vertically. Multiple Y-shaped grooves are linearly arrayed at the end of the bottom plate. The sealing plate, the cover plate, and the bottom plate are welded together to form a semi-enclosed air-filling chamber. The air inlet pipe is welded to the sealing plate.

[0006] Preferably, both the cover plate and the bottom plate are irregularly shaped plates with a round upper surface and a square lower surface, and the sealing plate is U-shaped.

[0007] Preferably, the air-blowing housing is further provided with a brass mesh with a mesh count of 100-400, and the brass mesh is connected to the cover plate, sealing plate and bottom plate by brazing.

[0008] Preferably, a guide post is provided on one side of the air blowing shell. The guide post is a stainless steel round bar with a gradually changing diameter of 9-12mm, and the large end of the guide post is fixed to the center position of the outer side of the base plate.

[0009] Preferably, the cover plate, sealing plate, and bottom plate are all austenitic stainless steel plates with a thickness of 1 mm.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: by inserting the guide post between the two plates in the area to be welded, it is quickly assembled with the plate tube, so that the edge of the plate tube is locked into the Y-shaped groove of the base plate and makes tight contact. Then, it is adjusted so that the back of the base plate contacts the back of the toothed plate. Argon gas enters the blowing shell through the gas inlet pipe, and then overflows evenly through the brass mesh filter, effectively protecting the back of the weld and preventing the back weld from directly contacting the air and oxidizing. The operation is simple, the device can be reused, effectively reducing the pre-welding preparation time and providing good back protection. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a partial sectional view of the present invention.

[0012] In the diagram: 1. Inlet pipe, 2. Air blowing shell, 2.1. Cover plate, 2.2. Sealing plate, 2.3. Brass mesh, 2.4. Base plate, 2.5. Y-shaped groove, 3. Guide column. Detailed Implementation

[0013] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right" indicating the orientation or positional relationship, they are only corresponding to the drawings of this application for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation.

[0014] Please see Figure 1-2 The present invention provides the following technical solution: Example 1: A back protection tool for welding plate tubes and toothed plates of a plate heat exchanger includes an air inlet pipe 1 and an air blowing shell 2; the air inlet pipe 1 is connected to the air blowing shell 2, one end of the air blowing shell 2 is open, and the air blowing shell 2 has a protrusion near the opening, the protrusion having a plurality of Y-shaped grooves 2.5 adapted to the edge of the plate tube; It should be noted that the air-blowing housing 2 includes a cover plate 2.1, a sealing plate 2.2, and a bottom plate 2.4. The cover plate 2.1 and the bottom plate 2.4 are arranged parallel to each other vertically. Multiple Y-shaped grooves 2.5 are linearly arrayed at the end of the bottom plate 2.4. The sealing plate 2.2, the cover plate 2.1, and the bottom plate 2.4 are welded together to form a semi-enclosed air-filling chamber. The air inlet pipe 1 is welded to the sealing plate 2.2. The edge of the plate tube is inserted into the Y-shaped groove 2.5 of the base plate 2.4 and made to make close contact. Then, it is adjusted so that the base plate 2.4 is in contact with the back of the toothed plate. Argon gas enters the blowing shell 2 through the gas inlet pipe 1 and blows argon gas to the back of the weld, effectively protecting the back of the weld and preventing the back weld from directly contacting the air and oxidizing. Specifically, cover plate 2.1 and bottom plate 2.4 are both irregularly shaped plates with a round top and a square bottom, and sealing plate 2.2 is U-shaped; cover plate 2.1, sealing plate 2.2 and bottom plate 2.4 are all austenitic stainless steel plates with a thickness of 1mm.

[0015] Example 2: Unlike Example 1, the gas blowing shell 2 is also provided with a brass mesh 2.3. The brass mesh 2.3 has a mesh size of 100-400 mesh. The brass mesh 2.3 is connected to the cover plate 2.1, the sealing plate 2.2 and the bottom plate 2.4 by brazing. By setting the brass mesh 2.3, the argon gas can overflow more evenly from the opening of the gas blowing shell 2.

[0016] Example 3: Unlike Example 1, the air blowing shell 2 is also provided with a guide post 3 on one side. The guide post 3 is a stainless steel round bar with a diameter of 9-12mm. The large end of the guide post 3 is fixed to the outer center of the base plate 2.4. After the plate tube and the toothed plate are assembled, the guide post 3 is inserted between the two plates in the area to be welded to guide the air blowing shell 2 to be quickly assembled with the plate tube.

[0017] The parts of this utility model not described in detail are prior art. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that this utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and are intended to include all changes that fall within the meaning and scope of equivalents in the content of this utility model.

Claims

1. A back protection fixture for welding plate tubes and toothed plates in a plate heat exchanger, characterized in that, It includes an air inlet pipe (1) and an air blowing shell (2); the air inlet pipe (1) is connected to the air blowing shell (2), one end of the air blowing shell (2) is open, and the air blowing shell (2) has a protrusion near the opening, the protrusion having a plurality of Y-shaped grooves (2.5) adapted to the edge of the plate tube.

2. The back protection fixture for welding plate tubes and toothed plates in a plate heat exchanger according to claim 1, characterized in that: The air-blowing housing (2) includes a cover plate (2.1), a sealing plate (2.2), and a bottom plate (2.4). The cover plate (2.1) and the bottom plate (2.4) are arranged parallel to each other. Multiple Y-shaped grooves (2.5) are linearly arrayed at the end of the bottom plate (2.4). The sealing plate (2.2), the cover plate (2.1), and the bottom plate (2.4) are welded together to form a semi-closed air-filling chamber. The air inlet pipe (1) is welded to the sealing plate (2.2).

3. The back protection fixture for welding plate tubes and toothed plates in a plate heat exchanger according to claim 2, characterized in that: The cover plate (2.1) and the bottom plate (2.4) are both irregularly shaped plates with a round top and a square bottom, and the sealing plate (2.2) is U-shaped.

4. The back protection fixture for welding plate tubes and toothed plates in a plate heat exchanger according to claim 2, characterized in that: The air-blowing housing (2) is also provided with a brass mesh (2.3), the brass mesh (2.3) has a mesh count of 100-400 mesh, and the brass mesh (2.3) is connected to the cover plate (2.1), the sealing plate (2.2) and the bottom plate (2.4) by brazing.

5. The back protection fixture for welding plate tubes and toothed plates in a plate heat exchanger according to claim 2, characterized in that: The air-blowing housing (2) is also provided with a guide post (3) on one side. The guide post (3) is a stainless steel round bar with a diameter of 9-12mm. The large end of the guide post (3) is fixed to the outer center of the base plate (2.4).

6. The back protection fixture for welding plate tubes and toothed plates in a plate heat exchanger according to claim 2, characterized in that: The cover plate (2.1), sealing plate (2.2) and bottom plate (2.4) are all austenitic stainless steel plates with a thickness of 1 mm.

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