Method for manufacturing liquid dispensing head and liquid dispensing head

Abstract

The present invention provides a method for manufacturing a liquid dispensing head and a liquid dispensing head, the method comprising: prefabricating a plurality of liquid outlet short pipes made of stainless steel; press-fitting the connection ends of the plurality of liquid outlet short pipes into a plurality of branch pipe holes on the liquid outlet end of a stainless steel body; welding the stainless steel body and the plurality of liquid outlet short pipes once by furnace brazing to form a universal body module; determining the specification of each branch pipe according to an order, assembling the connection ends of the plurality of branch pipes after the specification is determined at the ends of the plurality of liquid outlet short pipes on the universal body module. The universal body module and the plurality of branch pipes are welded twice, and after welding, a copper connection section connected to an external copper pipeline is formed at the end of each branch pipe.

Description

Technical Field

[0001] The invention relates to the field of refrigeration accessories, and in particular to a manufacturing method of a liquid dispensing head and the liquid dispensing head. Background Art

[0002] In the refrigeration system, the distributor is a device connected between the outlet of the thermal expansion valve and the multi-branch evaporator, used to evenly distribute the refrigerant after throttling by the thermal expansion valve to multiple branches of the evaporator. Traditional distributors are mainly made of copper, but with the continuous rise in copper prices, stainless steel distributors with lower material costs are now available on the market.

[0003] Since the current refrigeration system pipelines are still mainly copper pipelines, the connection problem between the branch pipe and the copper pipeline of the client needs to be considered after the liquid dispensing head is stainless steeled. In order to facilitate its connection with the external copper pipeline, a copper connection section matching the copper pipeline of the client needs to be set at the end of each branch pipe, or multiple branches need to be set as copper branches. In the refrigeration industry, the installation dimensions of refrigeration products of different client manufacturers are different, and the distribution and size of the corresponding copper pipelines are also different. Therefore, when manufacturing the liquid dispensing head, it is necessary to customize the copper connecting pipe or copper branch pipe according to the actual installation dimensions of the client product, and then produce the stainless steel body based on the branch pipe. This manufacturing method leads to a large number of liquid dispensing head models in the production process, which not only has slow order response and long production cycle, but also brings great inventory pressure, which seriously affects the mass production of stainless steel liquid dispensing heads. Summary of the invention

[0004] In order to overcome at least one deficiency of the prior art, the present invention provides a method for manufacturing a liquid dispensing head and a liquid dispensing head.

[0005] In order to achieve the above object, the present invention provides a method for manufacturing a liquid dispensing head, the liquid dispensing head comprising a stainless steel body, a plurality of liquid outlet short pipes and a plurality of branch pipes, the method for manufacturing the liquid dispensing head comprising:

[0006] Prefabricate multiple stainless steel liquid outlet short pipes;

[0007] Press the connecting ends of multiple liquid outlet short pipes into multiple branch pipe holes on the liquid outlet end of the stainless steel body;

[0008] The stainless steel body and multiple liquid outlet short pipes are welded at one time by furnace brazing to form a universal body module;

[0009] The specifications of each branch pipe are determined according to the order, and the connecting ends of the multiple branch pipes with the determined specifications are assembled at the ends of the multiple liquid outlet short pipes on the universal main body module;

[0010] The universal main body module and the plurality of branch pipes are welded twice, and after welding, a copper connection section connected to an external copper pipeline is formed at the end of each branch pipe.

[0011] According to an embodiment of the present invention, the branch pipe determined according to the order is a copper branch pipe, and the method for manufacturing the liquid dispensing head further includes:

[0012] Prefabricate a plurality of pipe copper connection sections and respectively assemble the plurality of pipe copper connection sections at the ends of a plurality of liquid outlet short pipes;

[0013] A stainless steel body, a plurality of short outlet pipes and a plurality of pipe copper connection sections are welded at one time by furnace brazing to form a universal body module;

[0014] The multiple copper branch pipes are welded to the corresponding copper connecting sections of the pipes on the universal body module by flame brazing for secondary welding.

[0015] According to an embodiment of the present invention, the branch pipe determined according to the order includes a stainless steel extension pipe and a copper connecting pipe, or the branch pipe is a copper branch pipe;

[0016] After the branch pipe is assembled to the end of the liquid outlet short pipe on the universal main body module, the main body module and multiple branch pipes are welded by furnace brazing for a secondary time; the brazing material used for the secondary welding is a brazing material suitable for welding between copper and steel or between steel and steel, and the liquidus line of the brazing material is greater than or equal to 750 degrees Celsius and less than the liquidus line of the brazing material used for the primary welding.

[0017] According to one embodiment of the present invention, the method for manufacturing the liquid dispensing head further includes:

[0018] When prefabricating each liquid outlet short pipe, a bending portion is processed on each liquid outlet short pipe;

[0019] When each liquid outlet short pipe is pressed into the corresponding branch pipe hole, ensure that the projection position of the liquid outlet short pipe end on the liquid outlet end surface of the stainless steel body is located radially outside or radially inside its connection end.

[0020] According to one embodiment of the present invention, the process of sleeve-connecting the connection ends of the plurality of branch pipes with determined specifications to the ends of the plurality of liquid outlet short pipes assembled on the universal body module comprises:

[0021] When the universal body module is placed horizontally, the horizontal section at the center of each outlet short pipe connection end is used as the reference plane to determine the end center position of the outlet short pipe;

[0022] Place the secondary welding brazing material according to the center position of the end of the liquid outlet short pipe: if the center of the end of the liquid outlet short pipe is higher than the reference plane, place the secondary welding brazing material on the end face of the liquid outlet short pipe when the liquid outlet short pipe and the branch pipe are sleeved; if the center of the end of the liquid outlet short pipe is lower than the reference plane, place the secondary welding brazing material on the end face of the connecting end of the branch pipe when the liquid outlet short pipe and the branch pipe are sleeved; if the center of the end of the liquid outlet short pipe is substantially flush with the reference plane, place the secondary welding brazing material on the end face of the liquid outlet short pipe and / or the end face of the connecting end of the branch pipe when the liquid outlet short pipe and the branch pipe are sleeved;

[0023] Afterwards, the assembly components are laid flat on a conveyor belt in a tunnel furnace, and the universal main body module and multiple branch pipes are secondary welded by furnace brazing.

[0024] According to one embodiment of the present invention, the connecting ends of all branch pipes are fully inserted into or fully sheathed on the ends of the corresponding liquid outlet short pipes; at this time, part of the secondary welding brazing material is built into the sleeve area formed by the branch pipe connecting ends and the liquid outlet short pipe ends, while the remaining part of the secondary welding brazing material is placed outside the sleeve area.

[0025] According to one embodiment of the present invention, the connecting ends of some branch pipes are inserted into the ends of the corresponding liquid outlet short pipes, while the connecting ends of other branch pipes are sheathed on the ends of the corresponding liquid outlet short pipes, so that all secondary welding brazing materials are built in or placed outside the sheathing area formed by the connecting ends of the branch pipes and the ends of the liquid outlet short pipes.

[0026] According to one embodiment of the present invention, when prefabricating the liquid outlet short pipe, the length of the liquid outlet short pipe is set to ensure that the axial length of the liquid outlet short pipe after being assembled with the stainless steel body is lower than the height of the tunnel furnace;

[0027] The assembly formed by the outlet short pipe and the stainless steel body is placed vertically on the conveyor belt of the tunnel furnace for primary welding.

[0028] According to one embodiment of the present invention, the method for manufacturing the liquid dispensing head further includes:

[0029] Prefabricated stainless steel liquid inlet nipple;

[0030] Assemble the liquid inlet short pipe to the liquid inlet connection hole on the liquid inlet end of the stainless steel body;

[0031] A universal body module is formed by welding a liquid inlet short pipe, a stainless steel body and a plurality of liquid outlet short pipes at one time by furnace brazing.

[0032] According to one embodiment of the present invention, the prefabrication of the liquid inlet short pipe includes:

[0033] A throttling section whose inner diameter is smaller than the inner diameter at the inlet end of the liquid inlet short pipe is processed at one end of the liquid inlet short pipe close to the liquid inlet connection hole;

[0034] Insert the throttling bushing into the throttling section to adjust the effective throttling inner diameter;

[0035] In one welding process, a liquid inlet short pipe, a throttling bushing, a stainless steel body and a plurality of liquid outlet short pipes are integrally welded by furnace brazing to form a universal body module.

[0036] According to one embodiment of the present invention, the method for manufacturing the liquid dispensing head further includes:

[0037] The specifications of the liquid inlet pipe are determined according to the order, and the liquid inlet pipe with the determined specifications is assembled and welded to the liquid inlet short pipe on the universal body module.

[0038] On the other hand, the present invention also provides a method for manufacturing a liquid dispensing head, the liquid dispensing head comprising a stainless steel body, a plurality of liquid outlet short pipes and a plurality of branch pipes, and each branch pipe comprises a stainless steel extension pipe and a copper connecting pipe, the method for manufacturing the liquid dispensing head comprising:

[0039] Prefabricate multiple stainless steel liquid outlet short pipes;

[0040] Press the connecting ends of multiple liquid outlet short pipes into multiple branch pipe holes on the liquid outlet end of the stainless steel body;

[0041] Assemble the stainless steel extension pipe on each branch pipe to the end of the corresponding liquid outlet short pipe;

[0042] The stainless steel body, a plurality of liquid outlet short pipes and a plurality of stainless steel extension pipes are welded at one time by furnace brazing to form an intermediate welding assembly;

[0043] Determine the specifications of the copper connecting pipe according to the order, and sleeve and assemble the copper connecting pipe with the determined specifications on the end of the stainless steel extension pipe in the middle welding assembly;

[0044] The intermediate welding components and multiple copper connecting pipes are welded by furnace brazing for secondary welding; the brazing material used for secondary welding is a brazing material suitable for welding between copper and steel, and the liquidus line of the brazing material is greater than or equal to 750 degrees Celsius and less than the liquidus line of the brazing material used for primary welding.

[0045] On the other hand, the present invention also provides a liquid dispensing head, which is manufactured by the manufacturing method of the liquid dispensing head described in the claim. The liquid dispensing head includes a universal main body module and a plurality of branch pipes. The universal main body module includes a stainless steel main body and a plurality of liquid outlet short pipes made of stainless steel. A plurality of branch pipe holes are formed on the liquid outlet end of the stainless steel main body, and the connecting end of each liquid outlet short pipe is connected to the corresponding branch pipe hole through a first brazing layer; a bending portion is formed on each liquid outlet short pipe, and based on the bending portion, the projection position of the end of the liquid outlet short pipe on the end surface of the stainless steel main body liquid outlet end is located radially outside or radially inside its connecting end. The connecting end of each branch pipe is welded to the corresponding liquid outlet short pipe on the universal main body module, and a copper connecting section connected to an external copper pipeline is formed at the end of each branch pipe.

[0046] According to one embodiment of the present invention, the universal body module further comprises a plurality of pipe copper connection sections welded to the end of each liquid outlet short pipe, the branch pipe is a copper branch pipe and the connecting end of the branch pipe is connected to the pipe copper connection section via a flame brazing layer.

[0047] According to one embodiment of the present invention, the branch pipe is a copper branch pipe, and the connecting end of the copper branch pipe is connected to the liquid outlet short pipe on the universal body module through the second brazing layer;

[0048] Or the branch pipe includes a stainless steel extension pipe and a copper connecting pipe, and the stainless steel extension pipe and the liquid outlet short pipe as well as the stainless steel extension pipe and the copper connecting pipe are connected by a second brazing layer;

[0049] The second brazing layer is formed by welding a brazing material suitable for welding between copper and steel or between steel and steel, and the liquidus line of the brazing material is greater than or equal to 750 degrees Celsius and less than the liquidus line of the brazing material used for the first welding.

[0050] According to an embodiment of the present invention, the outer diameter of the stainless steel extension tube is greater than or equal to 2 mm and less than or equal to 4.5 mm, and the wall thickness thereof is greater than or equal to 0.18 mm and less than or equal to 0.52 mm.

[0051] According to an embodiment of the present invention, the connection ends of all branch pipes are assembled to the ends of the corresponding liquid outlet short pipes in the same sleeve connection manner;

[0052] Alternatively, the connection ends of some branch pipes are inserted into the ends of the corresponding liquid outlet short pipes, while the connection ends of other branch pipes are sheathed on the ends of the corresponding liquid outlet short pipes.

[0053] According to an embodiment of the present invention, a liquid inlet connection hole is formed on the liquid inlet end of the stainless steel body, and the universal body module further comprises a liquid inlet short pipe made of stainless steel and connected to the liquid inlet connection hole via a first brazing layer.

[0054] According to one embodiment of the present invention, a throttling section with an inner diameter smaller than the inner diameter at the inlet end of the liquid inlet short pipe is formed on one end of the liquid inlet short pipe close to the liquid inlet connecting hole, and the universal main body module also includes a throttling bushing which is fully or partially inserted in the throttling section and is used to adjust the effective throttling inner diameter.

[0055] The present invention also provides another liquid dispensing head, which includes a stainless steel body, a plurality of liquid outlet short pipes made of stainless steel, and a plurality of branch pipes. A plurality of branch pipe holes are formed on the liquid outlet end of the stainless steel body. The connecting end of each liquid outlet short pipe is connected to the corresponding branch pipe hole through a first brazing layer, and a bending portion is formed on each liquid outlet short pipe. Based on the bending portion, the projection position of the end of the liquid outlet short pipe on the end surface of the liquid outlet end of the stainless steel body is located radially outside or radially inside its connecting end. Each branch pipe includes a stainless steel extension pipe and a copper connecting pipe, the front end of the stainless steel extension pipe is connected to the end of the liquid outlet short pipe through a first brazing layer, and the end of the stainless steel extension pipe is connected to the copper connecting pipe through a second brazing layer; the second brazing layer is formed by welding a brazing material suitable for welding between copper and steel, and the liquidus line of the second brazing material is greater than or equal to 750 degrees Celsius and less than the liquidus line of the brazing material used for one welding.

[0056] In summary, in the manufacturing method of the liquid dispensing head provided by the present invention, a plurality of stainless steel liquid dispensing short pipes are provided on the liquid outlet side of the stainless steel body, and the liquid dispensing short pipes and the stainless steel body are welded once to form a universal body module. This arrangement makes the specifications of the stainless steel body, the specifications of the branch pipe holes, and the welding and assembly of the stainless steel body no longer limited by the specifications of the client's branch pipes. During manufacturing, the stainless steel body and the plurality of liquid dispensing short pipes can be pre-processed and welded to form a universal body module for storage in the warehouse; after receiving the customer's order, it is only necessary to customize the branch pipe according to the customer's order, and then assemble the branch pipe in the universal body module and perform secondary welding. This arrangement can not only greatly shorten the production cycle of the stainless steel liquid dispensing head, but also because branch pipes of different specifications can share the same specification of the universal body module, it can also greatly reduce the models generated during the product manufacturing process, and effectively reduce the inventory pressure caused by the customization of the liquid dispensing head branch pipes with the client's pipelines.

[0057] Furthermore, furnace brazing is used to weld the universal body module during the first welding, and the welding blockage problem at the branch pipe hole is effectively avoided based on the stable and uniform furnace temperature of the tunnel furnace and the quantitative first welding brazing material. The shorter liquid outlet short pipe greatly reduces the size of the universal body module to ensure the efficiency of the first welding.

[0058] In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1The figure is a schematic flow chart of the method for manufacturing a liquid dispensing head provided in the first embodiment of the present invention.

[0060] Figure 2 Shown is the use of Figure 1 Schematic diagram of the structure of the liquid dispensing head manufactured by the method shown.

[0061] Figure 3 Shown Figure 2 A magnified schematic diagram of center A.

[0062] Figure 4 Shown Figure 2 A magnified schematic diagram of point B in the middle.

[0063] Figure 5 Shown Figure 2 Schematic diagram of the structure of the general-purpose body module.

[0064] Figure 6 Shown Figure 5 Schematic diagram of the structure after removing multiple short outlet pipes.

[0065] Figure 7 FIG. 1 is a schematic structural diagram of a universal body module provided in another embodiment of the present invention.

[0066] Figure 8 Shown Figure 1 The specific flow chart of step S40 in the manufacturing method is shown.

[0067] Fig. 9 Shown Figure 1 The manufacturing method shown is a schematic structural diagram of an assembly component formed after assembling in step S40.

[0068] Fig.10 Shown Fig. 9 Enlarged schematic diagram of point C in the middle.

[0069] Figures 11 to 13 A partial schematic diagram of an assembly component formed after assembling in step S40 in a method for manufacturing a liquid dispensing head provided in another embodiment of the present invention.

[0070] Figures 14 to 21 Shown is a partial schematic diagram of a liquid dispensing head with a different stainless steel body structure provided by another embodiment of the present invention.

[0071] Figure 22 to Figure 26 Shown is a partial schematic diagram of a different liquid dispensing head of a flow dispensing assembly provided in another embodiment of the present invention.

[0072] Fig. 27 The figure is a schematic flow chart of the method for manufacturing a liquid dispensing head provided in the second embodiment of the present invention.

[0073] Fig.28Shown is the use of Fig. 27 Schematic diagram of the structure of the liquid dispensing head manufactured by the method shown.

[0074] Fig.29 The figure is a schematic flow chart of the method for manufacturing a liquid dispensing head provided in the third embodiment of the present invention.

[0075] Fig.30 Shown is the use of Fig.29 Schematic diagram of the structure of the liquid dispensing head manufactured by the method shown.

[0076] Fig.31 Shown Fig.30 Schematic diagram of the structure of the general-purpose body module.

[0077] Fig.32 The figure is a schematic flow chart of the method for manufacturing a liquid dispensing head provided in the fourth embodiment of the present invention.

[0078] Fig.33 Shown is the use of Fig.32 Schematic diagram of the structure of the liquid dispensing head manufactured by the method shown.

[0079] FIG. 33A to FIG. 33C A schematic structural diagram of a liquid inlet short pipe provided for another embodiment of the invention.

[0080] Fig.34 The figure is a schematic flow chart of the method for manufacturing a liquid dispensing head provided in the fifth embodiment of the present invention.

[0081] Fig.35 Shown is the use of Fig.34 Schematic diagram of the structure of the liquid dispensing head manufactured by the method shown. DETAILED DESCRIPTION

[0082] Embodiment 1

[0083] Due to the installation dimensions and system pipeline distribution restrictions of refrigeration products from different client manufacturers, the branch pipes of the distributor head need to be customized according to different manufacturers. The existing branch pipes are directly connected to the structure of the branch pipe holes. Since the specifications and dimensions of the distributor head body (such as the distributor head body size and the branch pipe hole size) need to be coordinated with the branch pipes, if the client branch pipes are not determined, the structure of the distributor body cannot be determined. Therefore, current distributor head manufacturers usually start the processing and welding assembly of various components after receiving customer orders. This processing method results in slow order response rates and long product delivery times. Furthermore, since all components are customized based on the branch pipes, a large number of intermediate component models and distributor head product models will appear in the production process, which will put great pressure on production costs and inventory.

[0084] In view of this, the present embodiment provides a method for manufacturing a liquid dispensing head based on a universal body module 10 and a liquid dispensing head. Figure 2 As shown, the liquid dispensing head provided in this embodiment includes a stainless steel body 1, a plurality of liquid outlet short pipes 2 and a plurality of branch pipes 3. The manufacturing method thereof is as follows Figure 1 As shown, it includes: prefabricating a plurality of liquid outlet short pipes 2 made of stainless steel (step S10); pressing the connection ends 21 of the plurality of liquid outlet short pipes into the plurality of branch pipe holes 11 on the liquid outlet end of the stainless steel body 1 (step S20); welding the stainless steel body 1 and the plurality of liquid outlet short pipes 2 by furnace brazing at one time to form a universal body module 10 (step S30); determining the specifications of each branch pipe 3 according to the order, and assembling the connection ends 31 of the plurality of branch pipes after the specifications are determined at the ends of the plurality of liquid outlet short pipes 2 on the universal body module 10 (step S40); welding the universal body module 10 and the plurality of branch pipes 3 for a second time, and after welding, the end of each branch pipe 3 is formed with a copper connection section 3A connected to an external copper pipeline (step S50).

[0085] In the manufacturing method of the liquid dispensing head provided in this embodiment, the provision of the liquid outlet short pipe 2 makes the structure of the stainless steel body 1, the structure of the multiple branch pipe holes 11, and the assembly and welding of the stainless steel body 1 no longer subject to the specifications of the branch pipe 3. All parts and branch pipe holes 11 in the stainless steel body 1 can be pre-processed and formed based on the liquid outlet short pipe 2, and the liquid outlet short pipe 2 and the stainless steel body 1 are brazed in the furnace to form a universal body module 10 for storage in the warehouse. After the customer places an order, it is only necessary to customize the branch pipe 3 according to the customer's order, and then the branch pipe 3 is welded to the liquid outlet short pipe 2 on the universal body module 10 for a second time. Compared with the existing liquid dispensing head processing method that processes all parts based on customer orders, the processing method provided in this embodiment only needs to process the branch pipe 3 after receiving the customer's order, and no processing of the universal body module 10 is required. Such a processing method can greatly shorten the product delivery time to improve the order response rate. In addition, compared with the assembly welding of the branch pipe in the existing liquid dispensing head and the branch pipe hole on the liquid dispensing head body, the branch pipe 3 in this embodiment is assembled and welded to the end of the liquid outlet short pipe 2. This assembly and welding method is not only convenient and efficient, but also flexible in welding method, and there is no mutual thermal influence between the branches during the welding process. Furthermore, for branch pipes 3 of different specifications, it is only necessary to adjust the connection end of the branch pipe 3 to match the end structure of the liquid outlet short pipe 2 to achieve the sharing of the universal body module 10. No redundant customized parts are generated during the manufacturing process, which greatly reduces the production cost pressure and inventory pressure caused by the customization of the branch pipes of the liquid dispensing head.

[0086] Specifically, in the method for manufacturing the liquid dispensing head provided in this embodiment, when the liquid outlet short pipe is prefabricated in step S10, a curved portion 23 is also processed on each liquid outlet short pipe 2; and when each liquid outlet short pipe 2 is pressed into the corresponding branch pipe hole 11 (step S20), it is ensured that the projection position of the liquid outlet short pipe end 22 on the liquid outlet end surface of the stainless steel body 1 is located radially outside or radially inside its connection end 21. Figure 2 and Figure 5 As shown in FIG. 1 , when the curved portion 23 extends away from the center of the stainless steel body 1 and the projection position of its end 22 is located radially outside the connecting end 21, the spacing between the adjacent branch pipes 3 at the rear end will increase. On the contrary, Figure 7 As shown, if the projection position of the liquid outlet short pipe end 22 is located radially inward of the connection end 21, the spacing between the adjacent branch pipes 3 at the rear end is reduced. The setting of the curved portion 23 can adjust the spacing between the adjacent branch pipes 3 at the rear end to meet the needs of different client products without changing the spacing between the multiple branch pipe holes 11 on the stainless steel body 1, thereby improving the versatility of the stainless steel body 1 with relatively high material cost. However, the present invention does not make any limitation to this. In other embodiments, the liquid outlet short pipe can also be a straight pipe.

[0087] In the method for manufacturing a liquid dispensing head and the liquid dispensing head provided in this embodiment, the length of the liquid outlet short pipe 2 is relatively short, and its length is usually less than that of the branch pipe 3; specifically, its length is greater than or equal to 5 mm and less than or equal to 350 mm. However, the present invention does not make any limitation to this.

[0088] The method for manufacturing the liquid-dispensing head provided in the present embodiment also controls the length of the liquid outlet short pipe 2 when prefabricating the liquid outlet short pipe 2 in step S10, so as to ensure that the axial length of the assembly component formed after assembly in step S20 is lower than the height of the tunnel furnace, so that the assembly component can be placed vertically on the conveyor belt of the tunnel furnace for brazing in the furnace once (step S30). Such a welding method can not only maximize the number of universal body modules 10 that can be welded each time through the furnace and greatly improve the welding efficiency, but also the vertical placement method is more conducive to the penetration of the brazing material at the branch pipe hole 11. However, the present invention does not make any limitation to this. In other embodiments, when the length of the assembly component is greater than the height of the tunnel furnace, it can be laid flat on the conveyor belt for welding. Since the length of the liquid outlet short pipe 2 is relatively short, the area occupied by each assembly component on the conveyor belt after being laid flat is not large, and multiple assembly components can be stacked and placed in the direction of the height of the brazing material, so the number of universal body modules that can be welded in one furnace is still relatively large, so it still has excellent welding efficiency.

[0089] In this embodiment, the liquid outlet short pipe 2 and the stainless steel body 1 are assembled with stainless steel of the same metal, and the two are brazed in a furnace using oxygen-free copper brazing material during the primary welding to form a universal body module 10. For the convenience of description, the brazing material used for the primary welding is referred to as the primary brazing material in the following text. Although this embodiment is described by taking the primary brazing material as oxygen-free copper brazing material as an example. However, the present invention does not make any limitation to this. In other embodiments, the primary brazing material may also be other brazing materials suitable for steel-to-steel welding, such as tin bronze brazing material.

[0090] After the universal main body module 10 is welded in step S30, it is stored in the warehouse. When a customer order is received, the branch pipe 3 is customized based on the customer order. Figure 2 As shown, the branch pipe 3 is relatively long and includes a stainless steel extension pipe 301 and a copper connection pipe 302. When the branch pipe 3 is assembled in step S40, the stainless steel extension pipe 301 and the copper connection pipe 302 are sequentially sleeved at the end 22 of each liquid outlet short pipe, and a copper connection section 3A connected to an external copper pipeline is formed at the end of the copper connection pipe 302. However, the present invention is not limited to this. In other embodiments, the branch pipe can also be an integral copper pipe.

[0091] At this time, due to the long length of the branch pipe 3, when the universal main body module 10 and the branch pipe 3 are brazed in the furnace for secondary welding, the assembly formed by assembling the universal main body module 10 and the plurality of branch pipes 3 needs to be laid flat on the conveyor belt in the tunnel furnace. However, the arrangement of the curved portion 23 on the liquid outlet short pipe 2 causes the ends 22 of the liquid outlet short pipes to face different directions when the universal main body module 10 is laid flat (e.g. Figure 5 and Figure 7 As shown). The ends 22 of the liquid outlet short pipes with different orientations will affect the penetration of the secondary solder at the assembly of the liquid outlet short pipe 2 and the branch pipe 3, thereby causing flow soldering at the ends 22 of some liquid outlet short pipes. To solve this problem, the method for manufacturing the liquid distributor provided in this embodiment provides a plurality of solder placement positions at the socket joint of the liquid outlet short pipe 2 and the branch pipe 3. When placing the solder (referred to as secondary solder) 300 used for secondary welding, the corresponding solder placement position is selected according to the orientation of the end of each liquid outlet short pipe 2, thereby ensuring that the secondary solder at the end of each liquid outlet short pipe can penetrate into the socket joint area of ​​the corresponding liquid outlet short pipe 2 and the branch pipe 3 according to the specified path.

[0092] Specifically, Figure 8 As shown, the method for manufacturing a liquid dispensing head provided in this embodiment includes: in step S40, when a plurality of branch pipes 3 are sleeved and assembled on a plurality of liquid outlet short pipes 2 on a universal body module 10,

[0093] Step S401: When the universal body module 10 is placed horizontally, the horizontal section through the center of each liquid outlet short pipe connection end 21 is used as a reference plane, and the center position of the liquid outlet short pipe end 22 is determined according to the reference plane. Fig. 9 Take the placement of the middle liquid dispensing head as an example: Fig. 9 In the figure, the center line of the connection end 21 of the top liquid outlet short pipe is the DD line, and the horizontal section through the DD line is the reference plane of the top liquid outlet short pipe 2. The center position of the top liquid outlet short pipe end 22 is determined based on the reference plane. Obviously, the center position of the top liquid outlet short pipe end 22 is higher than its reference plane. Similarly, the center position of the end of the second liquid outlet short pipe 2 from top to bottom is also higher than its reference plane. But on the contrary, the center positions of the ends of the two liquid outlet short pipes located below are lower than the corresponding reference planes.

[0094] Step S402: Place the secondary brazing material 300 according to the center position of the end of the liquid outlet short pipe 2. Specifically, when the center position of the end of the liquid outlet short pipe 2 is higher than the reference plane, the secondary brazing material 300 is placed on the end surface of the end 22 of the liquid outlet short pipe when the liquid outlet short pipe 2 and the branch pipe 3 are connected (the liquid outlet short pipe 2 and the stainless steel extension pipe 301 are connected in this embodiment). Fig. 9 and Fig.10 When the end center of the liquid outlet short pipe 2 is lower than its reference plane, the secondary brazing material 300 is placed on the end surface of the branch pipe connection end 31 (i.e., the end surface of the stainless steel extension pipe 301), as shown in FIG. Fig. 9 and Fig.10 When the end center of the liquid outlet short pipe 2 is substantially flush with the reference plane, the placement position of the secondary solder 300 is not limited, and the secondary solder can be placed in one of the two solder placement positions or in both solder positions.

[0095] The liquid dispensing head welding method provided in this embodiment provides two solder placement positions at the sleeve joint of the liquid outlet short pipe 2 and the branch pipe 3, which are the end face of the liquid outlet short pipe terminal 22 and the end face of the branch pipe connecting end 31. When placing the secondary solder 300, the corresponding solder placement position is selected based on the orientation of the liquid outlet short pipe terminal 22, so that the molten solder can fully penetrate into the assembly gap between the liquid outlet short pipe 2 and the branch pipe 3 along the inclined downward path under the dual effects of capillary penetration and gravity, effectively avoiding the flow soldering of the secondary solder.

[0096] In this embodiment, if Fig. 9 and Fig.10As shown, when assembling multiple branch pipes 3, the connection end 31 of each branch pipe is inserted into the corresponding liquid outlet short pipe end 22. This assembly method makes the two secondary solders 300 located at the top externally placed in the socket area formed by the branch pipe connection end 31 and the liquid outlet short pipe end 22 (i.e., the solder is placed outside the socket area), while the two secondary solders 300 located at the bottom are internally placed in the socket area (i.e., the solder is placed inside the socket area). However, the present invention does not impose any limitation on the socket assembly method between the branch pipe and the liquid outlet short pipe. In other embodiments, such as Fig.11 As shown, the connecting end 31 of each branch pipe can also be arranged to be sheathed on the corresponding liquid outlet short pipe end 22. At this time, the two secondary solders 300 located at the upper part are built into the sleeve area, while the two secondary solders 300 located at the lower part are placed outside the sleeve area.

[0097] In other embodiments, the connecting ends 31 of some branch pipes may be inserted into the ends 22 of the corresponding liquid outlet short pipes, while the connecting ends 31 of other branch pipes may be sheathed over the ends 22 of the corresponding liquid outlet short pipes, so that all secondary brazing materials 300 are either internally or externally placed in the sheathing area. Fig.12 As shown, the connection ends 31 of the two upper branch pipes are placed outside the ends 22 of the corresponding liquid outlet short pipes, while the connection ends 31 of the two lower branch pipes are inserted inside the ends 22 of the corresponding liquid outlet short pipes; at this time, the four secondary brazing materials 300 are all built into the sleeve area. Fig.13 As shown, the connection ends 31 of the upper two branch pipes are inserted into the ends 22 of the corresponding liquid outlet short pipes, while the connection ends 31 of the lower two branch pipes are sheathed on the ends 22 of the corresponding liquid outlet short pipes; at this time, the four secondary brazing materials 300 are all placed outside the sheathing area.

[0098] After all the branch pipes 3 are assembled, step S50 is performed to use furnace brazing for secondary welding of the universal body module 10 and multiple branch pipes 3. Specifically, the assembly component is translated to the conveyor belt in the tunnel furnace, and at the same time, it is ensured that the state of the assembly component on the conveyor belt is the same as the assembly state to avoid changes in the end direction of each liquid outlet short pipe 2; thereafter, the tunnel furnace is started to perform furnace brazing. Furthermore, in actual production, the positioning tool can be used to position and assemble the branch pipe and the corresponding liquid outlet short pipe, and after the assembly is completed, it is transferred to the conveyor belt of the tunnel furnace together with the tool. However, the present invention does not impose any restrictions on this. In this embodiment, the brazing material used for secondary welding (i.e., secondary brazing material) is a brazing material suitable for welding between copper and steel and between steel and steel, and the liquidus line of the brazing material is greater than or equal to 750 degrees Celsius and less than the liquidus line of the brazing material used for primary welding. Specifically, the secondary brazing material can be tin bronze solder, silver phosphorus copper brazing material or other brazing materials that meet the above conditions.

[0099] Corresponding to the above-mentioned method for manufacturing a liquid dispensing head, this embodiment further provides a liquid dispensing head. Figures 2 to 6 As shown, the liquid dispensing head provided in this embodiment includes a universal body module 10 and a plurality of branch pipes 3. The universal body module 10 includes a stainless steel body 1 and a plurality of liquid outlet short pipes 2 made of stainless steel. A plurality of branch pipe holes 11 are formed on the liquid outlet end of the stainless steel body 1, and the connecting end 21 of each liquid outlet short pipe is connected to the corresponding branch pipe hole 11 through the first brazing layer 100. A bending portion 23 is formed on each liquid outlet short pipe 2. Based on the bending portion 23, the projection position of the end 22 of the liquid outlet short pipe on the end surface of the liquid outlet end of the stainless steel body 1 is located radially outside or radially inside its connecting end 21. The connecting end 31 of each branch pipe is welded to the corresponding liquid outlet short pipe 2 on the universal body module 10, and a copper connecting section connected to the external copper pipeline is formed at the end of each branch pipe.

[0100] In this embodiment, the branch pipe 3 includes a stainless steel extension pipe 301 and a copper connecting pipe 302, and the stainless steel extension pipe 301 and the liquid outlet short pipe 2 and the stainless steel extension pipe 301 and the copper connecting pipe 302 are connected by the second brazing layer 200. However, the present invention does not make any limitation to this. In other embodiments, the branch pipe can also be an integral copper branch pipe. In the client refrigeration system, the end of the branch pipe 3 needs to be connected to the corresponding branch of the heat exchanger to achieve the distribution of the refrigerant. Due to the distribution position of the heat exchanger branch in the refrigeration system, it is usually necessary to bend the branch pipe 3 to change the direction of its end during installation. To facilitate the bending of the branch pipe 3, the outer diameter of the stainless steel extension pipe 301 is greater than or equal to 2 mm and less than or equal to 4.5 mm in this embodiment, and its wall thickness is greater than or equal to 0.18 mm and less than or equal to 0.52 mm. Within the range of pipe diameter and wall thickness, the stainless steel extension pipe 301 has excellent molding and processing capabilities so that it can be well assembled on the heat exchanger pipeline in the refrigeration system. Furthermore, under the same wall thickness, the smaller the outer diameter of the stainless steel extension tube 301, the smaller its inner diameter; the refrigerant can maintain a high flow rate in the stainless steel extension tube 301 and effectively improve the heat exchange efficiency of the rear heat exchanger. Preferably, the outer diameter and wall thickness specifications of the stainless steel extension tube 301 are set to φ3.0mm*0.3mm, φ

[0101] Either 3.3mm*0.3mm or φ3.6mm*0.3mm.

[0102] In the present invention, the first brazing layer 100 is a brazing layer formed after a single welding, and the second brazing layer 200 is a brazing layer formed after a secondary welding. In the present embodiment, the first brazing layer 100 and the second brazing layer 200 are both formed by furnace brazing, the first brazing layer 100 is an oxygen-free copper brazing layer, and the second brazing layer 200 is a tin bronze brazing layer. However, the present invention does not make any limitation to this. In other embodiments, the second brazing layer may also be other brazing layers for welding between copper and steel or between steel and steel, but the secondary brazing material for forming the secondary brazing layer must meet the following requirements: its liquidus is greater than or equal to 750 degrees Celsius and less than the liquidus of the primary brazing material. Specifically, when the first brazing layer is a tin bronze brazing layer (i.e., the primary brazing material is a tin bronze brazing material), the liquidus of the secondary brazing material needs to be lower than the liquidus of the tin bronze material, such as using silver-phosphorus copper brazing material or other brazing materials that meet the above conditions.

[0103] Specifically, Figure 2 As shown in FIG. 1 , the stainless steel extension tube 301 of each branch tube 3 is inserted into the end 22 of the corresponding liquid outlet short pipe. However, the present invention does not limit this in any way. In other embodiments, the stainless steel extension tube 301 can also be placed outside the end 22 of the corresponding liquid outlet short pipe, such as Fig.11 Alternatively, in other embodiments, the connecting ends 31 of some branch pipes are inserted into the ends 22 of the corresponding liquid outlet short pipes, while the connecting ends 31 of other branch pipes are sheathed on the ends 22 of the corresponding liquid outlet short pipes, as shown in FIG. Fig.12 and Fig.13 shown.

[0104] In this embodiment, if Figure 5 and Figure 6 As shown, the stainless steel body 1 includes a cylinder 101, a pipe connecting plate 102 disposed at the bottom of the cylinder 101, and a flow dividing assembly 103 disposed in the cylinder 101. Based on the structure of the stainless steel body 1, the method for manufacturing the liquid dividing head provided in this embodiment needs to pre-assemble the various components in the stainless steel body 1, and then perform step S20. As for the assembly of the stainless steel body 1, it can be in step S10 or between step S10 and step 20.

[0105] The focus of the present invention is to form a universal body module 10 with a stainless steel body 1 and a plurality of liquid outlet short pipes 2 to solve the problems of long product delivery time, high production cost and heavy inventory pressure caused by the customization of branch pipes in the existing liquid separation head. The present invention does not make any limitation on the structure of the stainless steel body 1. All stainless steel body structures that can be formed by the existing stainless steel processing technology are within the protection scope of the present invention; that is, the welding of all stainless steel body structures and corresponding branch pipes can adopt the manufacturing method of the liquid separation head provided by the present invention. Figure 7As shown, the stainless steel body 1 may include a cylinder 101, a pipe connecting plate 102, a flow dividing assembly 103 and an end cover 104. Alternatively, as Fig.14 The stainless steel body 1 shown is an integral socket structure formed by spinning. Fig.15 and Fig.16 As shown, the stainless steel body 1 is a Venturi structure; specifically, Fig.15 The stainless steel body 1 is an integral structure. Fig.16 The stainless steel body 1 in the embodiment includes two parts of a split assembly. Fig.17 As shown, the stainless steel body 1 is a pressure drop structure with a pressure drop orifice plate 105 disposed inside. Fig.18 As shown, the stainless steel body 1 is a splitter structure with a splitter cone 106 formed by internal machining. Fig.19 As shown, the stainless steel body 1 is a reflective structure having a reflective countersunk hole 107. Alternatively, as Fig. 20 As shown, the stainless steel body 1 is an impeller structure with a turbulent impeller 108 inside. Fig.21 As shown, the stainless steel body 1 is a nozzle-type structure in which a liquid outlet nozzle 109 is formed near the branch pipe hole, in which a plurality of liquid outlet short pipes are radially distributed at the liquid outlet end of the body.

[0106] In this embodiment, if Figure 5 As shown, the flow-dividing component 103 is a partition, on which is formed a mixing chamber 1031 with an opening toward the liquid inlet end of the stainless steel body 1 and a depression extending toward the liquid outlet end of the stainless steel body 1. When projected along the axial direction of the stainless steel body 1, the mixing chamber 1031 is located on the inner periphery of the plurality of branch pipe holes 11; further, a plurality of guide holes 1032 are formed on the plane of the partition on the outer periphery of the mixing chamber 1031. However, the present invention does not impose any limitation on the specific structure of the flow-dividing component. In other embodiments, the flow-dividing component 103 may be a planar partition (such as Fig. 22 or a combination of a flat baffle and a guide cone (as shown in Fig.23 or a combination of a planar baffle and a flow guide sleeve (such as Fig.24 as shown); or a separate guide cone (as shown Fig.25 Alternatively, the flow dividing component 103 includes a multi-stage reflection mixing guide structure with multiple partitions, such as Fig.26 shown.

[0107] Embodiment 2

[0108] This embodiment is basically the same as the first embodiment and its variations, except that: in this embodiment, the branch pipe determined according to the order is a copper branch pipe and the welding method of the copper branch pipe and the universal body module 10 is different.

[0109] In this embodiment, if Fig. 27 and Fig.28 As shown, the method for manufacturing the dispensing head further includes:

[0110] Step S20-1, prefabricate multiple pipe copper connection sections 2-1 and respectively assemble the multiple pipe copper connection sections 2-1 at the ends of multiple liquid outlet short pipes 2. In this embodiment, the pipe copper connection section is first assembled at the end of the liquid outlet short pipe (i.e., step S20-1 is performed first), and then the connecting end of the liquid outlet short pipe is pressed into the multiple branch pipe holes 11 (i.e., step S20 is performed later). However, the present invention does not make any limitation to this. In other embodiments, step S20 may also be performed first, and then step S20-1 is performed.

[0111] Next, in step S30 , the stainless steel body 1 , the plurality of liquid outlet short pipes 2 , and the plurality of pipe copper connecting sections 2 - 1 are brazed in a tin bronze furnace at one time to form a universal body module 10 .

[0112] Afterwards, step S40 determines the specifications of the copper branch pipes according to the order.

[0113] In step S50 , flame brazing is used for secondary welding to weld the plurality of copper branch pipes (branch pipes 3 ) to the corresponding copper connecting sections 2 - 1 of the universal body module 10 .

[0114] The universal body module 10 based on the liquid outlet short pipe 2 provides more possibilities for welding the branch pipe 3. In this embodiment, the branch pipe 3 can be welded by flame brazing by adding a pipe copper connection section 2-1 at the end of the liquid outlet short pipe 2. Compared with furnace brazing, the welding temperature of flame brazing is lower and the welding heating time is short. The grain size of the copper branch pipe (branch pipe 3) will not become coarse due to high temperature and long-term welding. Therefore, the copper branch pipe (branch pipe 3) has high strength and excellent ductility after welding.

[0115] Furthermore, in the traditional copper liquid distributor manufacturing process, when the liquid distributor body and the copper branch pipe are welded by flame brazing, the uneven heating of the liquid distributor body can easily lead to welding blockage at the branch pipe hole. In the liquid distributor processing method provided in this embodiment, the liquid outlet short pipe 2 and the branch pipe hole 1 are welded by furnace brazing with stable and uniform temperature at one time. The stainless steel body 1 is heated evenly as a whole to ensure that the brazing material can evenly penetrate into the assembly gap between the liquid outlet short pipe 2 and the branch pipe hole 1, which solves the problem of branch pipe hole blockage caused by uneven heating of the body from the root. At the same time, the setting of the liquid outlet short pipe 2 also makes the position of flame brazing away from the stainless steel body 1, and the heat during flame brazing will not have any effect on the brazing layer at the branch pipe hole.

[0116] Embodiment 3

[0117] This embodiment is basically the same as the first embodiment and its variations, except that the method for manufacturing the liquid dispensing head provided in this embodiment further includes welding the liquid inlet short pipe 4 and the liquid inlet pipe 5 made of stainless steel.

[0118] Specifically, Fig.29 As shown, the manufacturing method of the liquid dispensing head provided in this embodiment includes:

[0119] Step S10': prefabricate multiple liquid outlet short pipes 2 made of stainless steel and a liquid inlet short pipe 4 made of stainless steel. Step S20': press the connection ends of the multiple liquid outlet short pipes 2 into the multiple branch pipe holes 11 on the liquid outlet end of the stainless steel body 1, and assemble the liquid inlet short pipe 4 to the liquid inlet connection hole 12 on the liquid inlet end of the stainless steel body 1. Step S30': weld the stainless steel body 1, the multiple liquid outlet short pipes 2 and the liquid inlet short pipe 4 at one time by furnace brazing to form a universal body module 10'. Step S40': determine the specifications of each branch pipe 3 and the specifications of the liquid inlet pipe 5 according to the order, respectively sleeve and assemble the connection ends of the multiple branch pipes 3 with the determined specifications on the multiple liquid outlet short pipes 2 on the universal body module 10', and assemble the liquid inlet pipe 5 with the determined specifications on the liquid inlet short pipe 4 on the universal body module 10'. Step S50': secondary welding of the universal body module 10', the multiple branch pipes 3 and the liquid inlet pipe 5.

[0120] Similar to the branch pipe 3, the end of the liquid inlet pipe 5 is also usually provided with a copper connection section customized based on the client's pipeline for easy connection. The universal main body module 10 based on the liquid inlet short pipe 4 also makes the structure of the stainless steel body 1 and the specifications of the liquid inlet connection hole 12 not limited by the liquid inlet pipe 5. After receiving the customer's order, it is only necessary to customize the liquid inlet pipe 5 and assemble it to the universal main body module 10, which greatly improves the production rate of the product. For the welding and assembly of the liquid inlet pipe 5, this embodiment welds the liquid inlet pipe 5 at the same time when welding multiple branch pipes 3 for the second time. However, the present invention does not make any limitation to this.

[0121] Correspondingly, such as Fig.30 and Fig.31 As shown, the liquid dispensing head provided in this embodiment also includes a liquid inlet short pipe 4 and a liquid inlet pipe 5 made of stainless steel. The connecting end 41 of the liquid inlet short pipe is connected to the liquid inlet connection hole 12 through the first brazing layer 100, and the end 42 thereof is connected to the liquid inlet pipe 5 through the second brazing layer 200. For the liquid inlet pipe 5, when its length is long, it can be provided with a liquid inlet extension pipe and a liquid inlet copper pipe made of stainless steel; if its length is short, it can be provided with an integral copper pipe.

[0122] Embodiment 4

[0123] This embodiment is basically the same as the third embodiment and its variations, except that: in this embodiment, the liquid inlet short pipe 4 includes a short pipe body 43 and a throttling bushing 44, and the steps for prefabricating the liquid inlet short pipe in step S10' are different.

[0124] In order to improve the asymmetric flow pattern at the inlet of the distributor caused by the bending of the liquid inlet pipe 5, the present embodiment is provided with a throttling section whose inner diameter is smaller than the inner diameter of the inlet end 42 of the liquid inlet pipe, and the refrigerant is depressurized and increased in speed based on the throttling section to improve the mixing uniformity of the two-phase refrigerant. In order to improve the mixing effect of the gas-liquid two-phase refrigerant, the inner diameter of the throttling section needs to be precisely controlled during processing, and the hardness of stainless steel is relatively large. When the inner diameter of the throttling section differs greatly from the inner diameter of the inlet end 42 of the liquid inlet pipe, the liquid inlet pipe 4 with the throttling section will be difficult to process.

[0125] To solve this problem, Fig.32 and Fig.33 As shown, the method for manufacturing the liquid dispensing head provided in this embodiment further includes:

[0126] S101', prefabricate the short pipe body 43 and the throttling bushing 44 and ensure that the minimum inner diameter of the throttling bushing 44 is less than or equal to the inner diameter of the outflow end of the short pipe body 43. Specifically, when prefabricating the short pipe body 43, a constriction section 431 is processed at the outflow end side thereof.

[0127] S102 ′, sleeve or butt-fit the throttling bushing 44 onto the constricted section 431 on the outflow end of the short pipe body 43 .

[0128] Step S30 uses furnace brazing to integrally weld the short pipe body 43, the throttling bushing 44, the stainless steel body 1 and the plurality of liquid outlet short pipes 2 to form a universal body module.

[0129] In this embodiment, a throttling section with a reduced inner diameter is formed by adding a throttling bushing 44, which improves the uniform liquid separation and allows the inlet end 42 of the liquid inlet short pipe to be well matched and welded with the liquid inlet pipe 5. The setting of the narrowing section 431 in step S101' can initially reduce the inner diameter difference between the inlet end 42 of the liquid inlet short pipe and the throttling section, so that the throttling bushing 44 can achieve the required inner diameter difference with a smaller wall thickness, which not only facilitates the processing of the throttling bushing but also reduces the material cost.

[0130] like Fig.33 As shown in FIG. 1 , in this embodiment, the throttling bushing 44 is completely inserted into the constricted section 431. However, the present invention does not limit this in any way. In other embodiments, the throttling bushing 44 may also be partially inserted into the constricted section 431 (e.g. Fig.33A ) or butt welded to the necking section 431 (such as Fig.33B), or the short pipe body 43 is set as a straight pipe, and the throttling bushing 44 is fully or partially inserted into the outflow end of the short pipe body 43 (such as Fig.33C ).

[0131] Embodiment 5

[0132] This embodiment is basically the same as the first embodiment and its variations, except that the assembly process of the stainless steel extension tube 301 in the branch tube 3 in the method for manufacturing the liquid dispensing head provided in this embodiment is different.

[0133] Specifically, Fig.34 As shown, the manufacturing method of the stainless steel liquid dispensing head provided in this embodiment includes:

[0134] Step S100, prefabricate a plurality of stainless steel liquid outlet short pipes 2;

[0135] Step S200, press-fit the connection ends of the plurality of liquid outlet short pipes 2 into the plurality of branch pipe holes 11 on the liquid outlet end of the stainless steel body 1;

[0136] Step S300, sleeve and assemble the stainless steel extension tube 301 on each branch pipe to the corresponding liquid outlet short pipe end 22;

[0137] Step S400, welding the stainless steel body 1, the plurality of liquid outlet short pipes 2 and the plurality of stainless steel extension pipes 301 at one time by furnace brazing to form an intermediate welding assembly;

[0138] Step S500, determining the specifications of the copper connecting pipe 302 according to the order, and sleeve-fitting the copper connecting pipe 302 with the determined specifications onto the end of the stainless steel extension pipe 301 in the middle welding assembly;

[0139] Step S600: Use furnace brazing to perform secondary brazing of the intermediate welding assembly and the plurality of copper connecting pipes 302. The brazing material used for the secondary welding (i.e., the secondary brazing material) is a brazing material suitable for welding between copper and steel, and the liquidus of the brazing material is greater than or equal to 750 degrees Celsius and less than the liquidus of the brazing material used for the primary welding.

[0140] Similar to the first embodiment, the method for manufacturing a liquid dispensing head provided in this embodiment also removes the processing restrictions of the copper pipe 302 customized by the client on the stainless steel body 1 by adding a short liquid outlet pipe 2, thereby improving product processing efficiency and reducing cost pressure and inventory pressure brought by product customization.

[0141] Correspondingly, such as Fig.35As shown, this embodiment provides a liquid dispensing head, which includes a stainless steel body 1, a plurality of liquid outlet short pipes 2 made of stainless steel, and a plurality of branch pipes 3. A plurality of branch pipe holes 11 are formed on the liquid outlet end of the stainless steel body 1. The connecting end 21 of each liquid outlet short pipe is connected to the corresponding branch pipe hole 11 through the first brazing layer 100, and a bending portion 23 is formed on each liquid outlet short pipe 2. Based on the bending portion 23, the projection position of the liquid outlet short pipe end 22 on the end surface of the liquid outlet end of the stainless steel body 1 is located radially outside or radially inside its connecting end 21. Each branch pipe 3 includes a stainless steel extension pipe 301 and a copper connecting pipe 302. The front end of the stainless steel extension pipe 301 is connected to the liquid outlet short pipe end 22 through the first brazing layer 100, and the end thereof is connected to the copper connecting pipe 302 through the second brazing layer 200. The second brazing layer 200 is formed by welding a secondary brazing material suitable for welding between copper and steel or between steel and steel, and the liquidus line of the secondary brazing material is greater than or equal to 750 degrees Celsius and less than the liquidus line of the oxygen-free copper brazing material.

[0142] Regarding the arrangement of the first soldering layer 100 and the second soldering layer 200 , this embodiment is substantially the same as the first embodiment and its variations, and will not be described in detail herein.

[0143] In summary, in the manufacturing method of the liquid dispensing head provided by the present invention, a plurality of stainless steel liquid dispensing short pipes are provided on the liquid outlet side of the stainless steel body, and the liquid dispensing short pipes and the stainless steel body are welded once to form a universal body module. This arrangement makes the specifications of the stainless steel body, the specifications of the branch pipe holes, and the welding and assembly of the stainless steel body no longer limited by the specifications of the client's branch pipes. During manufacturing, the stainless steel body and the plurality of liquid dispensing short pipes can be pre-processed and welded to form a universal body module for storage in the warehouse; after receiving the customer's order, it is only necessary to customize the branch pipe according to the customer's order, and then assemble the branch pipe in the universal body module and perform secondary welding. This arrangement can not only greatly shorten the production cycle of the stainless steel liquid dispensing head, but also because branch pipes of different specifications can share the same specification of the universal body module, it can also greatly reduce the models generated during the product manufacturing process, and effectively reduce the inventory pressure caused by the customization of the liquid dispensing head branch pipes with the client's pipelines.

[0144] Furthermore, furnace brazing is used to weld the universal body module during the first welding, and the welding blockage problem at the branch pipe hole is effectively avoided based on the stable and uniform furnace temperature of the tunnel furnace and the quantitative first welding brazing material. The shorter liquid outlet short pipe greatly reduces the size of the universal body module to ensure the efficiency of the first welding.

[0145] Although the present invention has been disclosed as above by the preferred embodiment, it is not intended to limit the present invention. Anyone familiar with this technology can make slight changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope of protection required by the claims.

Claims

1. A method for manufacturing a liquid dispensing head, characterized in that: The liquid dispensing head comprises a stainless steel body, a plurality of liquid outlet short pipes and a plurality of branch pipes, and the manufacturing method of the liquid dispensing head comprises: Prefabricate multiple stainless steel liquid outlet short pipes; Press the connecting ends of multiple liquid outlet short pipes into multiple branch pipe holes on the liquid outlet end of the stainless steel body; The stainless steel body and multiple liquid outlet short pipes are welded at one time by furnace brazing to form a universal body module; The specifications of each branch pipe are determined according to the order, and the connecting ends of the multiple branch pipes with the determined specifications are assembled at the ends of the multiple liquid outlet short pipes on the universal main body module; The universal main body module and the plurality of branch pipes are welded twice, and after welding, a copper connection section connected to an external copper pipeline is formed at the end of each branch pipe.

2. The method for manufacturing a liquid dispensing head according to claim 1, characterized in that: According to the branch pipe determined in the order, the branch pipe is a copper branch pipe, and the manufacturing method of the liquid dispensing head also includes: Prefabricate a plurality of pipe copper connection sections and respectively assemble the plurality of pipe copper connection sections at the ends of a plurality of liquid outlet short pipes; A stainless steel body, a plurality of short outlet pipes and a plurality of pipe copper connection sections are welded at one time by furnace brazing to form a universal body module; The plurality of copper branch pipes are connected to the corresponding copper connecting sections of the connecting pipes on the universal body module by secondary welding using flame brazing.

3. The method for manufacturing a liquid dispensing head according to claim 1, characterized in that: The branch pipes determined in accordance with the order include stainless steel extension pipes and copper connecting pipes, or the branch pipes are copper branch pipes; After the branch pipe is assembled to the end of the liquid outlet short pipe on the universal main body module, the main body module and multiple branch pipes are welded by furnace brazing for a secondary time; the brazing material used for the secondary welding is a brazing material suitable for welding between copper and steel or between steel and steel, and the liquidus line of the brazing material is greater than or equal to 750 degrees Celsius and less than the liquidus line of the brazing material used for the primary welding.

4. The method for manufacturing a liquid dispensing head according to claim 1, characterized in that: The manufacturing method of the liquid dispensing head also includes: When prefabricating each liquid outlet short pipe, a bending portion is processed on each liquid outlet short pipe; When each liquid outlet short pipe is pressed into the corresponding branch pipe hole, ensure that the projection position of the liquid outlet short pipe end on the liquid outlet end surface of the stainless steel body is located radially outside or radially inside its connection end.

5. The method for manufacturing a liquid dispensing head according to claim 3, characterized in that: The process of sleeve-connecting the connection ends of the plurality of branch pipes with determined specifications to the ends of the plurality of liquid outlet short pipes assembled on the universal body module comprises: When the universal body module is placed horizontally, the horizontal section at the center of each outlet short pipe connection end is used as the reference plane to determine the end center position of the outlet short pipe; Place the secondary welding brazing material according to the center position of the end of the liquid outlet short pipe: if the center of the end of the liquid outlet short pipe is higher than the reference plane, place the secondary welding brazing material on the end face of the liquid outlet short pipe when the liquid outlet short pipe and the branch pipe are sleeved; if the center of the end of the liquid outlet short pipe is lower than the reference plane, place the secondary welding brazing material on the end face of the connecting end of the branch pipe when the liquid outlet short pipe and the branch pipe are sleeved; if the center of the end of the liquid outlet short pipe is substantially flush with the reference plane, place the secondary welding brazing material on the end face of the liquid outlet short pipe and / or the end face of the connecting end of the branch pipe when the liquid outlet short pipe and the branch pipe are sleeved; Afterwards, the assembly components are laid flat on a conveyor belt in a tunnel furnace, and the universal main body module and multiple branch pipes are secondary welded by furnace brazing.

6. The method for manufacturing a liquid dispensing head according to claim 5, characterized in that: The connecting ends of all branch pipes are fully inserted into or fully sheathed on the ends of the corresponding liquid outlet short pipes; at this time, part of the secondary welding brazing material is built into the sleeve area formed by the branch pipe connecting end and the liquid outlet short pipe end, and the rest of the secondary welding brazing material is placed outside the sleeve area.

7. The method for manufacturing a liquid dispensing head according to claim 5, characterized in that: The connecting ends of some branch pipes are inserted into the ends of the corresponding liquid outlet short pipes, while the connecting ends of other branch pipes are sheathed on the ends of the corresponding liquid outlet short pipes, so that all secondary welding brazing materials are built in or placed outside the sleeve area formed by the branch pipe connecting ends and the liquid outlet short pipe ends.

8. The method for manufacturing a liquid dispensing head according to claim 1, characterized in that: When prefabricating the liquid outlet short pipe, the length of the liquid outlet short pipe is set to ensure that the axial length of the liquid outlet short pipe after assembly with the stainless steel body is lower than the height of the tunnel furnace; The assembly formed by the outlet short pipe and the stainless steel body is placed vertically on the conveyor belt of the tunnel furnace for primary welding.

9. The method for manufacturing a liquid dispensing head according to claim 1, characterized in that: The manufacturing method of the liquid dispensing head also includes: Prefabricated stainless steel liquid inlet nipple; Assemble the liquid inlet short pipe to the liquid inlet connection hole on the liquid inlet end of the stainless steel body; A universal body module is formed by welding a liquid inlet short pipe, a stainless steel body and a plurality of liquid outlet short pipes at one time by furnace brazing.

10. The method for manufacturing a liquid dispensing head according to claim 9, characterized in that: The liquid inlet nipple includes a nipple body and a throttling bushing. When the liquid inlet nipple is prefabricated, it includes: Prefabricate the nipple body and throttle bushing and ensure that the minimum inner diameter on the throttle bushing is less than or equal to the inner diameter of the outflow end of the nipple body; Sleeve or butt-fit the throttling bushing onto the outflow end of the short pipe body; In one welding process, the short pipe body, the throttling bushing, the stainless steel body and a plurality of liquid outlet short pipes are integrally welded by furnace brazing to form a universal body module.

11. The method for manufacturing a liquid dispensing head according to claim 9, characterized in that: The manufacturing method of the liquid dispensing head also includes: The specifications of the liquid inlet pipe are determined according to the order, and the liquid inlet pipe with the determined specifications is assembled and welded to the liquid inlet short pipe on the universal body module.

12. A method for manufacturing a liquid dispensing head, characterized in that: The liquid dispensing head comprises a stainless steel body, a plurality of liquid outlet short pipes and a plurality of branch pipes, and each branch pipe comprises a stainless steel extension pipe and a copper connecting pipe. The manufacturing method of the liquid dispensing head comprises: Prefabricate multiple stainless steel liquid outlet short pipes; Press the connecting ends of multiple liquid outlet short pipes into multiple branch pipe holes on the liquid outlet end of the stainless steel body; Assemble the stainless steel extension pipe on each branch pipe to the end of the corresponding liquid outlet short pipe; The stainless steel body, a plurality of liquid outlet short pipes and a plurality of stainless steel extension pipes are welded at one time by furnace brazing to form an intermediate welding assembly; Determine the specifications of the copper connecting pipe according to the order, and sleeve and assemble the copper connecting pipe with the determined specifications on the end of the stainless steel extension pipe in the middle welding assembly; The intermediate welding components and multiple copper connecting pipes are welded by furnace brazing for secondary welding; the brazing material used for secondary welding is a brazing material suitable for welding between copper and steel, and the liquidus line of the brazing material is greater than or equal to 750 degrees Celsius and less than the liquidus line of the brazing material used for primary welding.

13. A liquid dispensing head, characterized in that: The liquid dispensing head is manufactured by the manufacturing method of claim 1, and the liquid dispensing head comprises: A universal body module, comprising a stainless steel body and a plurality of liquid outlet short pipes made of stainless steel, wherein a plurality of branch pipe holes are formed on the liquid outlet end of the stainless steel body, and the connecting end of each liquid outlet short pipe is connected to the corresponding branch pipe hole through a first brazing layer; a bending portion is formed on each liquid outlet short pipe, and based on the bending portion, the projection position of the end of the liquid outlet short pipe on the end surface of the liquid outlet end of the stainless steel body is located radially outside or radially inside the connecting end thereof; There are multiple branch pipes, and the connection end of each branch pipe is welded to the corresponding liquid outlet short pipe on the universal body module. The end of each branch pipe is formed with a copper connection section connected to the external copper pipeline.

14. The liquid dispensing head according to claim 13, characterized in that: The universal body module also includes a plurality of pipe copper connection sections welded to the end of each liquid outlet short pipe, the branch pipe is a copper branch pipe and the connecting end of the branch pipe is connected to the pipe copper connection section through a flame brazing layer.

15. The liquid dispensing head according to claim 13, characterized in that: The branch pipe is a copper branch pipe, and the connecting end of the copper branch pipe is connected to the liquid outlet short pipe on the universal body module through the second brazing layer; Or the branch pipe includes a stainless steel extension pipe and a copper connecting pipe, and the stainless steel extension pipe and the liquid outlet short pipe as well as the stainless steel extension pipe and the copper connecting pipe are connected by a second brazing layer; The second soldering layer is formed by soldering a solder suitable for soldering between copper and steel or between steel and steel, and the liquidus of the solder is greater than or equal to 750 degrees Celsius and less than the liquidus of the solder used for primary welding.

16. The liquid dispensing head according to claim 15, characterized in that: The outer diameter of the stainless steel extension tube is greater than or equal to 2 mm and less than or equal to 4.5 mm, and the wall thickness is greater than or equal to 0.18 mm and less than or equal to 0.52 mm.

17. The liquid dispensing head according to claim 13, characterized in that: The connecting ends of all branch pipes are assembled on the ends of the corresponding liquid outlet short pipes in the same socket-joining manner; Alternatively, the connection ends of some branch pipes are inserted into the ends of the corresponding liquid outlet short pipes, while the connection ends of other branch pipes are sheathed on the ends of the corresponding liquid outlet short pipes.

18. The liquid dispensing head according to claim 13, characterized in that: A liquid inlet connection hole is formed on the liquid inlet end of the stainless steel body, and the universal body module further comprises a liquid inlet short pipe which is connected to the liquid inlet connection hole via a first brazing layer and is made of stainless steel.

19. The liquid dispensing head according to claim 18, characterized in that: The liquid inlet short pipe comprises a short pipe body and a throttling bushing welded to the outflow end of the short pipe body, and the minimum inner diameter of the throttling bushing is less than or equal to the inner diameter of the outflow end of the short pipe body.

20. The liquid dispensing head according to claim 19, characterized in that: A constricted section with a reduced inner diameter is formed on the outflow end of the short pipe body, and the throttling bushing is sleeved or butted against the constricted section; Alternatively, the short pipe body is a straight pipe with a substantially constant inner diameter and wall thickness, and the throttling bushing is sleeved or butted to the outflow end of the short pipe body.

21. A liquid dispensing head, characterized in that: The liquid dispensing head is manufactured by the manufacturing method of claim 12, wherein the liquid dispensing head comprises: The stainless steel body has a plurality of branch pipe holes formed on the liquid outlet end; A plurality of liquid outlet short pipes made of stainless steel, each of which has a connection end connected to a corresponding branch pipe hole through a first brazing layer, and each of which has a bending portion formed thereon. Based on the bending portion, the projection position of the end of the liquid outlet short pipe on the end surface of the liquid outlet end of the stainless steel body is located radially outside or radially inside the connection end thereof; A plurality of branch pipes, each branch pipe comprises a stainless steel extension pipe and a copper connecting pipe, the front end of the stainless steel extension pipe is connected to the end of the liquid outlet short pipe through a first brazing layer, and the end of the stainless steel extension pipe is connected to the copper connecting pipe through a second brazing layer; the second brazing layer is formed by welding a brazing material suitable for welding between copper and steel, and the liquidus line of the second brazing material is greater than or equal to 750 degrees Celsius and less than the liquidus line of the brazing material used for one welding.

Images