Welding aid and plate heat exchanger welding method

Abstract

The application provides a welding auxiliary device and a plate heat exchanger welding method. The welding auxiliary device is used for welding of a plate heat exchanger and a joint. An upper end plate of the plate heat exchanger is defined as a plate. The welding auxiliary device comprises: a mounting seat; a first positioning member arranged above the mounting seat, wherein the first positioning member comprises a first reference surface, and the first reference surface is located on a lower surface of the first positioning member; and a second positioning member arranged above the mounting seat, wherein the second positioning member comprises a supporting surface. The second positioning member and / or the first positioning member can move in a vertical direction to adjust a height difference between the supporting surface and the first reference surface. The application can control reliable cooperation of the joint and the interface part and ensure welding quality between the joint and the interface part.

Description

Technical Field

[0001] This application relates to the field of heat exchanger manufacturing technology, and in particular to a welding auxiliary device and a welding method for plate heat exchangers. Background Technology

[0002] Currently, most liquid-cooled air conditioning units in the energy storage market use plate heat exchangers on their evaporator side. One end plate of the plate heat exchanger has an interface section, through which the cooling medium enters the interior of the plate heat exchanger for heat exchange. The interface section usually requires a welded joint (e.g., copper pipe) to facilitate the connection of the plate heat exchanger to the piping of the liquid-cooled air conditioning unit.

[0003] Because plate heat exchangers are brazed in batches using vacuum furnaces, defects are unavoidable during the furnace welding process, especially the poor flatness of the lower end face (the side without the joint). In related technologies, when welding the joint and the plate heat exchanger, the plate heat exchanger is placed on a support platform, and the support platform is used as a reference surface to control the welding position and insertion depth of the joint. However, this method is affected by the flatness of the lower end face of the plate heat exchanger. Unevenness of the lower end face can cause deviations in the positioning of the joint, resulting in insufficient or excessive insertion depth of the welded joint and the plate heat exchanger, which in turn leads to welding defects between the joint and the interface. Summary of the Invention

[0004] Experiments revealed that plate heat exchangers undergo varying degrees of external deformation during furnace welding. Compared to the lower plate, the upper plate, i.e., the plate where the joint is installed, exhibits the least significant deformation and higher flatness. Based on these findings, the first aspect of this application provides a welding auxiliary device, comprising: Mounting base; A first positioning element is disposed above the mounting base. The first positioning element includes a first reference surface, which is located on the lower surface of the first positioning element. The plate of the plate heat exchanger mounting joint is defined as the upper plate. The first reference surface is used to contact and position with the upper plate of the plate heat exchanger. A second positioning element is disposed above the mounting base, and the second positioning element includes a support surface; The second positioning element and / or the first positioning element can move in a vertical direction to adjust the height difference between the support surface and the first reference surface.

[0005] The technical solution provided in this application can achieve the following beneficial effects: The welding auxiliary device provided in this application includes a mounting base, a first positioning member, and a second positioning member. The first positioning member is used to position the plate heat exchanger, and the second positioning member is used to position the joint. The first positioning member is disposed above the mounting base and includes a first reference surface located on the lower surface of the first positioning member. The upper end plate of the plate heat exchanger is in contact with the first reference surface for positioning. The joint is installed on the upper end plate of the plate heat exchanger. The second positioning member is disposed above the mounting base and includes a support surface located on the upper surface of the second positioning member. The joint is placed on the support surface. At least one of the first and second positioning members can move vertically to adjust the height difference between the support surface and the first reference surface. The first reference surface is in direct contact with the upper end plate of the plate heat exchanger for positioning. Since the upper end plate of the plate heat exchanger has fewer manufacturing defects and higher flatness, the positioning error between the joint and the plate heat exchanger can be reduced, making the welding insertion depth between the welded joint and the plate heat exchanger more accurate and reducing welding defects.

[0006] The second aspect of this application provides a welding method for a plate heat exchanger, wherein the upper end plate of the plate heat exchanger is provided with an interface portion, and a joint is welded to the interface portion on a welding auxiliary device. The welding auxiliary device includes a mounting base, a first positioning element, and a second positioning element. The first positioning element and the second positioning element are disposed above the mounting base. The first positioning element includes a first reference surface, and the second positioning element is provided with a support surface. The welding method includes the following steps: Adjust the welding auxiliary device to the first state, with the height difference between the support surface and the first reference surface being H0; Place the plate heat exchanger on the welding auxiliary device; Position the upper end plate in contact with the first reference surface; Place the connector on the support surface and insert it into the interface, so that the connector and the interface reach the predetermined mating depth; Welded joints and interfaces.

[0007] The technical solution provided in this application can achieve the following beneficial effects: The welding auxiliary device provided in this application includes a mounting base, a first positioning element, and a second positioning element. The first positioning element is used to position the plate heat exchanger, and the second positioning element is used to position the joint. The first positioning element is disposed above the mounting base and includes a first reference surface located on the lower surface of the first positioning element. The upper end plate of the plate heat exchanger is in contact with the first reference surface for positioning. Since the joint is installed on the upper end plate of the plate heat exchanger, the second positioning element is disposed above the mounting base and includes a support surface located on the upper surface of the second positioning element. The joint is placed on the support surface. At least one of the first and second positioning elements can move vertically to adjust the height difference between the support surface and the first reference surface. The first reference surface directly contacts and positions the upper end plate of the plate heat exchanger. Since the upper end plate of the plate heat exchanger has fewer manufacturing defects and higher flatness, the positioning error between the joint and the plate heat exchanger can be reduced, and the welding insertion depth between the welded joint and the plate heat exchanger can be more accurate, reducing welding defects.

[0008] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0009] Figure 1 A top view of the welding auxiliary device provided in the embodiments of this application; Figure 2 A side view of the welding auxiliary device provided in an embodiment of this application; Figure 3 A front view of the welding auxiliary device in the first state provided in the embodiments of this application; Figure 4 for Figure 3 A schematic diagram of the three-dimensional structure; Figure 5 A front view of the welding auxiliary device in the second state provided in the embodiments of this application; Figure 6 for Figure 5 A schematic diagram of the three-dimensional structure; Figure 7 for Figure 4 A magnified view of a section at point A in the middle; Figure 8 for Figure 4 A magnified view of a section at point B in the middle; Figure 9 for Figure 8 A schematic diagram of another local structure is shown.

[0010] Figure label: 1-Welding auxiliary equipment; 11-Mounting base; 12-First positioning component; 121 - First reference plane; 13-Second positioning component; 131-Support Surface 132 - Positioning groove; 133-Cap; 14 - First Support Column; 141-Slider; 15-Pressure clamping mechanism; 151 - First Linkage; 151a - Handle; 152 - Second Link; 152a - First connecting part; 152b - Second connecting part; 153 - First hinge point; 154 - Second hinge point; 155 - Third hinge point; 156 - First fixed seat; 156a - Guide section; 157 - Second fixed seat; 16 - Second support column; 17-Supporting component; 171-Limit Block; 18-Lifting mechanism; 19-Guide components; 2-Plate heat exchanger; 21-Upper end plate; 211-Interface Section; 3-Connector; 31-First Pipeline; 32-Second section. The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Detailed Implementation

[0011] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0012] In the description of this application, unless otherwise expressly specified and limited, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; unless otherwise specified or explained, the term "multiple" refers to two or more; the terms "connected," "fixed," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0013] In the description of this specification, it should be understood that the directional terms such as "upper" and "lower" used in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should also be understood that when it is mentioned that an element is connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected to the other element "upper" or "lower" through an intermediate element.

[0014] like Figures 1-9 As shown, this application provides a welding auxiliary device 1, which provides support and positioning when welding a first workpiece and a second workpiece. The first workpiece and the second workpiece can be any two workpieces to be welded. In the various embodiments of this application, only a plate heat exchanger 2 as the first workpiece and a joint 3 as the second workpiece are used as examples for detailed description.

[0015] like Figures 1-6 As shown, the welding auxiliary device 1 includes a mounting base 11, a first positioning member 12, and a second positioning member 13. The mounting base 11 is used to install and fix the welding auxiliary device 1. A placement space is provided above the mounting base 11, meaning that during welding, the plate heat exchanger 2 is placed above the mounting base 11. The first positioning member 12 is located above the mounting base 11 and is used to position the plate heat exchanger 2; the second positioning member 13 is located above the mounting base 11 and is used to position the joint 3. At least one of the first positioning member 12 and the second positioning member 13 can move vertically to adjust the height difference between the second positioning member 13 and the first positioning member 12, thereby controlling the mating depth between the joint 3 and the plate heat exchanger 2.

[0016] The plate heat exchanger 2 includes an upper end plate 21 and a lower end plate arranged opposite to each other. The upper end plate 21 is provided with an interface portion 211 for welding and fixing the joint 3. When the plate heat exchanger 2 is placed on the welding auxiliary device 1, the upper end plate 21 faces upward and the lower end plate faces downward. The joint 3 includes a first tube portion 31 and a second tube portion 32 that are perpendicular to each other. The first tube portion 31 is inserted into the interface portion 211, and the second tube portion 32 is parallel to the upper end plate 21.

[0017] Furthermore, the first positioning element 12 includes a first reference surface 121, which is located on the lower surface of the first positioning element 12. The upward-facing surface of the plate heat exchanger 2 contacts and is positioned with the first reference surface 121. Since the installation position of the connector 3 is on the upward-facing surface of the plate heat exchanger 2, the direct contact and positioning of the first reference surface 121 with the upward-facing surface of the plate heat exchanger 2 allows the first reference surface 121 to better match the actual installation position of the connector 3. This enables a more accurate reflection of the actual mating depth between the connector 3 and the plate heat exchanger 2, ensuring that the actual mating depth between the connector 3 and the plate heat exchanger 2 conforms to the predetermined mating depth. In addition, the upward-facing surface of the plate heat exchanger 2 is flatter, thus better ensuring the mating accuracy between the connector 3 and the plate heat exchanger 2.

[0018] Furthermore, the second positioning element 13 includes a support surface 131 located on its upper surface. The connector 3 is placed on the support surface 131, with the downward-facing surface of the connector 3 contacting and positioning itself with the support surface 131. This reduces or avoids factors such as the cross-sectional shape or diameter of the connector 3 affecting the mating depth between the connector 3 and the plate heat exchanger 2. In addition, the user only needs to place the connector 3 on the support surface 131 from top to bottom to complete the mating between the connector 3 and the second positioning element 13. The structure is simple and the operation is convenient.

[0019] Specifically, when the first positioning member 12 includes a first reference surface 121 and the second positioning member 13 includes a support surface 131, the upper end plate 21 of the plate heat exchanger 2 is positioned in contact with the first reference surface 121, and the lower surface of the second tube portion 32 of the connector 3 is positioned in contact with the support surface 131. At least one of the first positioning member 12 and the second positioning member 13 can move in the vertical direction to adjust the height difference H between the support surface 131 and the first reference surface 121, thereby controlling the mating depth between the first tube portion 31 of the connector 3 and the interface portion 211 of the plate heat exchanger 2.

[0020] It should be noted that the support surface 131 can be configured as a plane, arc, U-shaped, or V-shaped surface, etc., as long as it can provide stable upward support for the joint 3. When the support surface 131 is a plane, the height of the plane is the height of the support surface 131; when the support surface 131 is an arc or other non-plane surface, the height of the lowest point of the non-plane surface is the height of the support surface 131. When the height of the support surface 131 is higher than the height of the first reference surface 121, the height difference H between the support surface 131 and the first reference surface 121 is a positive number; when the height of the support surface 131 is lower than the height of the first reference surface 121, the height difference H between the support surface 131 and the first reference surface 121 is a negative number.

[0021] Furthermore, the welding auxiliary device 1 has a first state (refer to...) Figure 3 and Figure 4 The first state refers to the state of the welding auxiliary device 1 when the joint 3 is welded to the plate heat exchanger 2. In the first state, the height difference between the support surface 131 and the first reference surface 121 is H0. H0 is determined by the shape of the support surface 131, the cross-sectional shape and size of the second tube 32, and the length of the first tube 31. When the height difference between the support surface 131 and the first reference surface 121 is H0, the interface 211 of the first tube 3 of the joint 3 and the plate heat exchanger 2 reaches the predetermined mating depth. The user only needs to adjust the height difference between the support surface 131 and the first reference surface 121 to H0, then position the upper plate 21 of the plate heat exchanger 2 in contact with the first reference surface 121, and place the second tube 32 of the joint 3 on the support surface 131 to ensure that the joint 3 and the plate heat exchanger 2 reach the predetermined mating depth. There is no need to observe the mating depth between the joint 3 and the plate heat exchanger 2. The adjustment method is simple and reliable, improving the convenience of operation.

[0022] Specifically, taking the support surface 131 as a plane as an example, in the first state, the height of the first pipe part 31 of the connector 3 is set to H2, the height of the interface part 211 is H3, and the welding insertion depth of the connector 3 is H4, then H4 = H2 - (H0 - H3).

[0023] Furthermore, the welding auxiliary device 1 has a second state (refer to...) Figure 5 and Figure 6 The second state is the state of the welding auxiliary device 1 after the joint 3 and the plate heat exchanger 2 have been welded. In the second state, the height difference between the support surface 131 and the first reference surface 121 is H1, where H1 < H0. After the joint 3 and the plate heat exchanger 2 have been welded, the user adjusts the height difference between the support surface 131 and the first reference surface 121 to H1, so that the first reference surface 121 is separated from the upper end plate 21, or the support surface 131 is separated from the joint 3, so that a free movement space is formed above or below the plate heat exchanger 2, thereby allowing the plate heat exchanger 2 to be easily removed from the welding auxiliary device 1.

[0024] Specifically, after the joint 3 is welded to the plate heat exchanger 2: when the height difference between the support surface 131 and the first reference surface 121 is H0, the first reference surface 121 contacts the plate heat exchanger 2, and the support surface 131 contacts the joint 3, so that the first positioning member 12 and the second positioning member 13 are clamped between the plate heat exchanger 2 and the joint 3, which plays a role in fixing each other. At this time, the plate heat exchanger 2 is difficult to remove from the welding auxiliary device 1. When the height difference between the support surface 131 and the first reference surface 121 is adjusted to H1, the height between the first positioning member 12 and the second positioning member 13 is reduced, so that the plate heat exchanger 2 and the joint 3 loosen their clamping and fixing of the first positioning member 12 and the second positioning member 13. Therefore, the plate heat exchanger 2 can be easily removed from the welding auxiliary device 1, reducing the wear that may occur when the plate heat exchanger 2 is removed from the welding auxiliary device 1.

[0025] Furthermore, the welding auxiliary device 1 also includes a support 17, which is disposed above the mounting base 11, and a placement space is disposed above the support 17. The support 17 is used to support the plate heat exchanger 2. The support 17 can move in the vertical direction to adjust the height difference between the support 17 and the first reference surface 121, so that the plate heat exchanger 2 placed above the support 17 can contact and be limited with the first reference surface 121. Specifically, before the plate heat exchanger 2 is placed, the support member 17 is positioned low, and there is a large placement space above the support member 17, which can reduce the interference or collision that may occur when placing the plate heat exchanger 2, making the installation and placement of the plate heat exchanger 2 easier. After the plate heat exchanger 2 is placed in place, the position of the support member 17 is raised, so that the plate heat exchanger 2 contacts and is limited by the first reference surface 121. There is no need to change the height of the first positioning member 12 and the second positioning member 13, which can prevent the height difference H between the support surface 131 and the first reference surface 121 from changing and affecting the mating depth of the interface 211 between the first tube 31 and the plate heat exchanger 2.

[0026] Furthermore, the welding auxiliary device 1 also includes a lifting mechanism 18 and a guide assembly 19. The lifting mechanism 18 may be, for example, a cylinder, and connects the support member 17 to the base to drive the support member 17 to move vertically. The guide assembly 19 may include, for example, interlocking guide posts and guide holes, and connects the support member 17 to the base to ensure that the support member 17 moves vertically and prevents the support member 17 from shifting horizontally.

[0027] Furthermore, a plurality of limiting blocks 171 are provided above the support member 17. The limiting blocks 171 are detachably connected to the support member 17, and the limiting blocks 171 are arranged at intervals to form a limiting space. The plate heat exchanger 2 is placed in this limiting space to form a horizontal limit on the plate heat exchanger 2, preventing the plate heat exchanger 2 from moving on the support during the welding process, which would cause the joint 3 and the interface 211 of the plate heat exchanger 2 to have coaxiality and other deviations, affecting the welding quality.

[0028] In some embodiments, the welding auxiliary device 1 further includes a first support column 14, which is connected to the mounting base 11 and extends in the height direction. A first positioning member 12 is connected to the first support column 14 and is movable along the first support column 14, that is, the first positioning member 12 is movable in the vertical direction, thereby adjusting the height difference between the second positioning member 13 and the first positioning member 12.

[0029] Furthermore, the first positioning member 12 has a first position and a second position, and the first positioning member 12 reciprocates between the first position and the second position. In the first state, the first positioning member 12 is located in the first position, and the first positioning member 12 can contact and limit the plate heat exchanger 2; in the second state, the first positioning member 12 is located in the second position, and the first positioning member 12 is separated from the plate heat exchanger 2. When the model of the plate heat exchanger 2 and the model of the connector 3 remain unchanged (for example, when welding the same batch of plate heat exchangers 2 and connectors 3), the height of the second positioning member 13 can remain unchanged. By adjusting the height of the first positioning member 12, the working state of the welding auxiliary device 1 can be changed, which can make the operation simpler and more reliable, and also ensure the consistency of welding quality.

[0030] Furthermore, the welding auxiliary device 1 also includes a clamping mechanism 15. The clamping mechanism 15 can be any suitable mechanism such as a cylinder, hydraulic cylinder, or cam mechanism, as long as it can achieve reciprocating motion in the vertical direction. The clamping mechanism 15 connects the first positioning member 12 and the first support column 14 to fix the first positioning member 12 in a first position or a second position, thereby enabling the welding auxiliary device 1 to be stably maintained in the first state or the second state, preventing the position of the welding auxiliary device 1 from changing during use, which could affect the welding quality or cause accidents such as pinching fingers.

[0031] like Figure 7As shown, in some embodiments, the clamping mechanism 15 includes a first connecting rod 151 and a second connecting rod 152 hinged to each other. The first connecting rod 151 is connected to the first support column 14, and a first hinge point 153 is provided between the first connecting rod 151 and the first support column 14; the second connecting rod 152 is connected to the first positioning member 12, and a second hinge point 154 is provided between the second connecting rod 152 and the first positioning member 12; the first connecting rod 151 and the second connecting rod 152 can rotate relative to each other to adjust the distance between the first hinge point 153 and the second hinge point 154, thereby driving the first positioning member 12 to move along the first support column 14. That is to say, the clamping mechanism 15 includes a linkage mechanism, which drives the first positioning member 12 to move along the first support column 14. The structure is simple, it is easy to obtain high manufacturing precision, and it can bear a large load during use with less wear or deformation damage. Therefore, the positional accuracy of the first positioning member 12 can be improved.

[0032] The first link 151 and the second link 152 can be configured into any suitable shape as needed, such as a straight line, a broken line, or a curved shape. A handle 151a may be protruding from one side of the first link 151 or the second link 152. The user applies external force to the handle 151a to make the first link 151 and the second link 152 rotate relative to each other, thereby changing the state of the clamping mechanism 15.

[0033] Furthermore, a third hinge point 155 is provided between the first connecting rod 151 and the second connecting rod 152. The line connecting the first hinge point 153 and the third hinge point 155 is the first connecting line, and the line connecting the second hinge point 154 and the third hinge point 155 is the second connecting line. When the third hinge point 155 is located between the first hinge point 153 and the second hinge point 154, and the first connecting line and the second connecting line are on the same straight line, the first positioning member 12 is located in the first position; when the first connecting line and the second connecting line are at a preset angle, the first positioning member 12 is located in the second position. On the one hand, this ensures that the first positioning member 12 is accurately and stably fixed in the first position, preventing slight changes in the position of the first positioning member 12 during welding; on the other hand, it allows the first positioning member 12 to be easily switched to the second position under external force, making operation more convenient and effortless.

[0034] Specifically, when the third hinge point 155 is located between the first hinge point and the second hinge point 154, and the first connecting line and the second connecting line are on the same straight line, the height of the first positioning member 12 is reduced to its lowest point. Furthermore, the first link 151 and the second link 152 are only subjected to forces along the first and second connecting lines, thus exhibiting high balance. The first link 151 and the second link 152 remain relatively stationary, thereby ensuring that the first positioning member 12 is accurately and stably fixed in the first position. When the user applies a force perpendicular to the first and second connecting lines to the first link 151 or the second link 152, the balance between the first link 151 and the second link 152 is easily broken, allowing the first link 151 and the second link 152 to rotate freely relative to each other, thereby enabling the first positioning member 12 to easily switch to the second position.

[0035] In one embodiment, the second connecting rod 152 includes a first connecting portion 152a and a second connecting portion 152b disposed opposite to each other, with a cavity between the first connecting portion 152a and the second connecting portion 152b. The first connecting rod 151 is clamped between the first connecting portion 152a and the second connecting portion 152b, and the first hinge point 153 can rotate into the cavity, so that the included angle between the first connecting line and the second connecting line can be close to or equal to 0°, thereby increasing the range of relative rotation angle between the second connecting rod 152 and the first connecting rod 151. This allows the range of vertical movement of the first positioning member 12 to be maximized while keeping the overall size of the clamping mechanism 15 basically unchanged. Therefore, it can be ensured that when the first positioning member 12 is in the second position, the plate heat exchanger 2 and the joint 3 can fully loosen their fixation on the first positioning member 12 and the second positioning member 13, reducing possible interference or collisions when the plate heat exchanger 2 is removed from the welding auxiliary device 1.

[0036] The first link 151 can be directly connected to the first support column 14, or the first link 151 can be indirectly connected to the first support column 14 through other transmission components; similarly, the second link 152 can be directly connected to the first positioning member 12, or the second link 152 can be indirectly connected to the first positioning member 12 through other transmission components.

[0037] In one embodiment, the clamping mechanism 15 includes a first fixed seat 156, and a first connecting rod 151 is connected to a first support column 14 through the first fixed seat 156. For example, the first connecting rod 151 is hinged to the first fixed seat 156, and the first fixed seat 156 is fixed to the first support column 14 by means of threaded fasteners, etc., to simplify the connection and fixation between the clamping mechanism 15 and the first support column 14, and to simplify the assembly process of the welding auxiliary device 1. Similarly, the clamping mechanism 15 includes a second fixed seat 157, and a second connecting rod 152 is connected to a first positioning member 12 through the second fixed seat 157. For example, the second connecting rod 152 is hinged to the second fixed seat 157, and the second fixed seat 157 is fixed to the first positioning member 12 by means of threaded fasteners, etc., to simplify the connection and fixation between the clamping mechanism 15 and the first positioning member 12, and to simplify the assembly process of the welding auxiliary device 1.

[0038] Furthermore, a guide portion 156a protrudes from one side of the first fixed seat 156, and the second fixed seat 157 passes through the guide portion 156a and can slide along the guide portion 156a. On the one hand, the guide portion 156a increases the stability of the movement of the second fixed seat 157 and reduces the tilting or shaking generated during the movement of the second fixed seat 157; on the other hand, the guide portion 156a connects the first fixed seat 156, the first connecting rod 151, the second connecting rod 152, the second fixed seat 157, and the first fixed seat 156 in sequence, so that the pressing mechanism 15 itself can form a closed geometric structure, thereby ensuring that the pressing mechanism 15 moves according to a predetermined trajectory.

[0039] Furthermore, the first support column 14 can be connected to a slider 141, which is slidably connected to the first support column 14 and can slide up and down along the first support column 14; the first fixed seat 156 is connected to the slider 141, and the first fixed seat 156 slides up and down together with the slider 141 to adjust the height of the first fixed seat 156, thereby adjusting the overall height of the pressing mechanism 15, so that the pressing mechanism 15 can adapt to plate heat exchangers 2 of various heights.

[0040] Furthermore, a first locking member (not shown in the figure) can be provided between the slider 141 and the first support column 14 to lock or release the slider 141; when the first locking member releases the slider 141, the slider 141 can slide freely along the first support column 14; when the first locking member locks the slider 141, the slider 141 is fixed to the first support column 14.

[0041] like Figure 8 and Figure 9As shown, in some embodiments, the welding auxiliary device 1 further includes a second support column 16, which is connected to the mounting base 11 and extends in the height direction. A second positioning member 13 is connected to the second support column 16 and is movable along the second support column 16, that is, the second positioning member 13 is movable in the vertical direction, thereby adjusting the height difference between the second positioning member 13 and the first positioning member 12.

[0042] Furthermore, a second locking member (not shown in the figure) can be provided between the second positioning member 13 and the second support column 16 to lock or release the second positioning member 13. When the second locking member releases the second positioning member 13, the second positioning member 13 can slide freely along the second support column 16; when the second locking member locks the second positioning member 13, the second positioning member 13 is fixed to the second support column 16.

[0043] In some embodiments, the second positioning member 13 can extend and retract along its own length direction, or the second positioning member 13 can move along its own length direction to adjust the horizontal position of the second positioning member 13 above the support base, so that the interface portion 211 and the positioning groove 132 are on the same straight line in the horizontal direction, ensuring that the first tube portion 31 can be aligned with the interface portion 211 for installation.

[0044] In one embodiment, the second support column 16 is slidable along its own length on the mounting base 11. The welding auxiliary device 1 also includes a third locking member, which connects the second support column 16 and the mounting base 11 to lock or release the second support column 16; when the third locking member releases the second support column 16, the second support column 16 is slidable freely along its own length on the mounting base 11; when the third locking member locks the second support column 16, the second support column 16 is fixed to the mounting base 11.

[0045] Furthermore, the second positioning member 13 is provided with a positioning groove 132, which is recessed in the upper surface of the second positioning member 13. The support surface 131 is located at the bottom of the positioning groove 132. At least a part of the connector 3 can be accommodated in the positioning groove 132, thereby limiting the connector 3 on both sides in the radial direction, making it easier for the connector 3 to be aligned with the interface 211.

[0046] Furthermore, the positioning groove 132 passes through both sides of the second positioning member 13 along the width direction, and the second tube portion 32 of the connector 3 can pass through the positioning groove 132 to avoid interference between the positioning groove 132 and the second tube portion 32 along the length direction, ensuring that when the length of the second tube portion 32 changes, the second tube portion 32 can slide along the positioning groove 132, so that the first tube portion 31 can still be aligned with the interface portion 211 for installation.

[0047] Furthermore, a cover 133 is provided above the second positioning member 13. The cover 133 is rotatably connected to the second positioning member 13 to open or close the positioning groove 132. When the cover 133 opens the positioning groove 132, the joint 3 can be freely inserted into or removed from the positioning groove 132. When the cover 133 closes the positioning groove 132, the cover 133 and the positioning groove 132 together form a circumferentially closed frame structure, which can prevent the joint 3 from vibrating in the positioning groove 132 or falling out of the positioning groove 132 during the welding process, thus better ensuring the welding quality.

[0048] In addition, this application embodiment also provides a plate heat exchanger welding method, including welding a joint 3 to the interface portion 211 of the plate heat exchanger 2 on any of the above-mentioned welding auxiliary devices 1. The welding method includes the following steps: adjusting the welding auxiliary device 1 to a first state, with the height difference between the support surface 131 and the first reference surface 121 being H0; placing the plate heat exchanger 2 on the welding auxiliary device 1; raising the plate heat exchanger 2 so that the upper end plate 21 contacts and is positioned with the first reference surface 121; placing the joint 3 on the support surface 131 and inserting it into the interface portion 211 so that the joint 3 and the interface portion 211 reach a predetermined mating depth; welding the joint 3 to the interface portion 211. The user only needs to adjust the height difference between the support surface 131 and the first reference surface 121 to H0, then position the upper plate 21 of the plate heat exchanger 2 in contact with the first reference surface 121, and place the second tube 32 of the connector 3 on the support surface 131. This will ensure that the connector 3 and the plate heat exchanger 2 reach the predetermined mating depth. There is no need to observe the mating depth between the connector 3 and the plate heat exchanger 2. The adjustment method is simple and reliable, which improves the convenience of operation.

[0049] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A welding auxiliary device for welding plate heat exchangers and joints, wherein the plate on which the plate heat exchanger mounts the joint is defined as the upper end plate, characterized in that, The welding auxiliary device includes: Mounting base; A first positioning element is disposed above the mounting base. The first positioning element includes a first reference surface, which is located on the lower surface of the first positioning element. The first reference surface is used to contact and position the upper end plate of the plate heat exchanger. A second positioning element is disposed above the mounting base, and the second positioning element includes a support surface; The second positioning element and / or the first positioning element can move in a vertical direction to adjust the height difference between the support surface and the first reference surface.

2. The welding auxiliary device according to claim 1, characterized in that, The welding auxiliary device has a first state, in which the height difference between the support surface and the first reference surface is H0.

3. The welding auxiliary device according to claim 2, characterized in that, The welding auxiliary device has a second state, in which the height difference between the support surface and the first reference surface is H1, where H1 < H0.

4. The welding auxiliary device according to claim 3, characterized in that, The welding auxiliary device further includes a first support column, which is connected to the mounting base. The first positioning member is connected to the first support column and can move along the first support column. The first positioning member has a first position and a second position. In the first state, the first positioning element is located at the first position; In the second state, the first positioning element is located in the second position.

5. The welding auxiliary device according to claim 4, characterized in that, The welding auxiliary device further includes a clamping mechanism, which connects the first positioning member and the first support column to fix the first positioning member in the first position or the second position.

6. The welding auxiliary device according to claim 5, characterized in that, The clamping mechanism includes a first link and a second link that are hinged to each other; The first connecting rod is connected to the first support column, and a first hinge point is provided between the first connecting rod and the first support column; The second link is connected to the first positioning member, and a second hinge point is provided between the second link and the first positioning member; The first link and the second link can rotate relative to each other to adjust the distance between the first hinge point and the second hinge point.

7. The welding auxiliary device according to claim 6, characterized in that, A third hinge point is provided between the first link and the second link. The line connecting the first hinge point and the third hinge point is the first connecting line, and the line connecting the second hinge point and the third hinge point is the second connecting line. When the third hinge point is located between the first hinge point and the second hinge point, and the first connecting line and the second connecting line are on the same straight line, the first positioning member is located at the first position; When the first connecting line and the second connecting line are at a preset angle, the first positioning member is located at the second position.

8. The welding auxiliary device according to claim 6, characterized in that, The second connecting rod includes a first connecting part and a second connecting part disposed opposite to each other, and a cavity is provided between the first connecting part and the second connecting part; The first connecting rod is clamped between the first connecting part and the second connecting part, and the first hinge point can rotate into the cavity.

9. The welding auxiliary device according to claim 1, characterized in that, The welding auxiliary device also includes: The second support column is connected to the mounting base, and the second positioning member is connected to the second support column and can slide up and down along the second support column; A locking element connects the second positioning element and the second support column to lock or release the second positioning element.

10. The welding auxiliary device according to any one of claims 1-9, characterized in that, The welding auxiliary device also includes a support member disposed above the mounting base. The support member is movable in a vertical direction to adjust the height difference between the support member and the first reference surface.

11. A welding method for a plate heat exchanger, characterized in that, The upper plate of the plate heat exchanger is provided with an interface section, and the joint is welded to the interface section using a welding auxiliary device; The welding auxiliary device includes a mounting base, a first positioning member, and a second positioning member. The first positioning member and the second positioning member are disposed above the mounting base. The first positioning member includes a first reference surface, which is used to contact and position with the upper end plate of the plate heat exchanger. The second positioning member is provided with a support surface. The welding method includes the following steps: The welding auxiliary device is adjusted to a first state, and the height difference between the support surface and the first reference surface is H0. The plate heat exchanger is placed on the welding auxiliary device; Position the upper end plate in contact with the first reference surface; Place the connector on the support surface and insert it into the interface portion so that the connector and the interface portion reach a predetermined mating depth; Weld the joint to the interface.

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