阅读说明：本技术 中央空调用水管接头及其制造方法 (Water pipe joint for central air conditioner and its making process ) 是由 王志祥 于 2020-05-28 设计创作，主要内容包括：本发明公开了中央空调用水管接头及其制造方法,包括管体和保护管套,管体的外侧面设有六角螺母,六角螺母的外侧面设有连接板,连接板的顶面和底面均焊接有支撑板,支撑板和保护管套焊接固定。该方法包括：a、一体铸造成型水管接头加工段；b、装配下压装置；c、装配水管接头加工段；d、单边焊接支撑板；e、对支撑板补焊；f、打磨；g、取出水管接头加工支撑段；h、焊接外环板；i、焊接保护管套。本发明能保证管体和外部管道之间连接处的密封性,且能提高保护管套的受力能力。该方法中,可在六角螺母上均匀设置六块支撑板,能快速将支撑板和连接板的连接处采用焊缝满焊,保证焊缝的长度,而且能提高焊接质量和焊接精度。(The invention discloses a water pipe joint for a central air conditioner and a manufacturing method thereof. The method comprises the following steps: a. integrally casting a water pipe joint processing section; b. assembling a pressing device; c. assembling a water pipe joint processing section; d. welding a supporting plate on a single side; e. repair welding the supporting plate; f. polishing; g. taking out the water pipe joint to process the supporting section; h. welding the outer ring plate; i. and welding the protective pipe sleeve. The invention can ensure the sealing performance of the connection between the pipe body and the external pipeline and can improve the stress capability of the protective pipe sleeve. In the method, six support plates can be uniformly arranged on the hexagon nut, the joint of the support plates and the connecting plate can be quickly subjected to full welding by adopting the welding line, the length of the welding line is ensured, and the welding quality and the welding precision can be improved.)

1. Water pipe joint for central air conditioning, including the body, the both ends of body are equipped with the mouth of pipe that is used for connecting tube, its characterized in that: still include two protection pipe casings, the protection pipe casing is in on the orificial outside, the mouth of pipe with the junction of pipeline is located in the protection pipe casing, the lateral surface of body is equipped with hexagon nut, hexagon nut's lateral surface is equipped with and is the circular shape connecting plate, the backup pad has all been welded to the top surface and the bottom surface of connecting plate, the backup pad with protection pipe casing welded fastening, every lateral surface of hexagon nut corresponds one the backup pad, hexagon nut's lateral surface with backup pad welded fastening.

2. The water pipe joint for a central air conditioner according to claim 1, characterized in that: the pipe body, hexagon nut and the connecting plate are of an integral casting structure.

3. The water pipe joint for a central air conditioner according to claim 1, characterized in that: the outer side of the connecting plate is welded with a circular outer ring plate, the top surface of the outer ring plate extends out of the top surface of the connecting plate, and the bottom surface of the outer ring plate extends out of the bottom surface of the connecting plate.

4. The water pipe joint for a central air conditioner according to claim 2, characterized in that: the outer side face of the bottom of the supporting plate is an arc face, and the outer side face of the bottom of the supporting plate is welded to the inner side of the outer ring plate.

5. The water pipe joint for a central air conditioner according to claim 1, characterized in that: the top of backup pad is equipped with the installation breach, the protection tube cover welding is in the installation breach.

6. The water pipe joint for a central air conditioner according to any one of claims 1 to 5, characterized in that: the outer side welding of backup pad has the outside reinforcing plate, the both sides portion of outside reinforcing plate is equipped with the connection inclined plane, is in adjacent two on same circumference the connection inclined plane of outside reinforcing plate is hugged closely each other and welded fastening.

7. The method for manufacturing the water pipe joint for the central air conditioner according to claim 1, characterized by comprising the following steps:

a. integrally casting and molding the pipe body, the hexagon nut and the connecting plate in a processing plant to obtain a water pipe joint processing section;

b. assembling a pressing device: a pressing device is adopted to position the supporting plate, the pressing device comprises an air cylinder and lower pressing plates, the two lower pressing plates are symmetrically fixed on the bottom of a fixing plate at the bottom of the air cylinder through screws, and then the air cylinder is fixed on a machine body through screws;

c. assembling a water pipe joint processing section: the assembling device is arranged on a rotating disc of the motor, the motor is fixed on the machine body, the assembling disc of the assembling device is fixedly connected with the rotating disc through screws, a pipe orifice at one end of a pipe body of the water pipe joint machining section is connected to an assembling shaft of the assembling device in a threaded mode, the lower pressing plate is arranged above the water pipe joint machining section at the moment, and the lower pressing plate is parallel to the side face, located above, of a hexagonal nut of the water pipe joint machining section;

d. unilateral welding of the supporting plate:

(1) opening an air cylinder, controlling the lower pressure plate to move downwards for a set distance by the air cylinder, arranging two supporting plates on the side surface of the hexagonal nut of the water pipe joint machining section above the hexagonal nut, symmetrically placing the two supporting plates, clamping the supporting plates into a limiting groove at the bottom of the lower pressure plate, tightly attaching the bottom surfaces of the supporting plates to the side surface of a connecting plate of the water pipe joint machining section, and positioning the supporting plates in the limiting groove at the bottom of the lower pressure plate;

(2) the part of the support plate, which is exposed out of the lower pressing plate, is subjected to unilateral welding, the joint of the support plate and the hexagon nut is welded by adopting a welding seam, meanwhile, the joint of the support plate and the connecting plate is welded by adopting a welding seam, the cylinder is returned, and at the moment, the lower pressing plate returns to the initial position;

(3) controlling the motor to rotate by 60 degrees, rotating the water pipe joint machining section by 60 degrees at the moment, repeating the step (1) and the step (2), and welding a supporting plate on the second side surface of the hexagonal nut;

(4) repeating the step (3), and performing unilateral welding on the rest side surface of the hexagon nut to form a supporting plate;

e. repair welding the supporting plate: when the lower pressing plate returns to the initial position, welding the other joint of the supporting plate and the hexagon nut by adopting a welding seam, and welding the other joint of the supporting plate and the connecting plate by adopting a welding seam;

f. the bottom outer side of the grinding supporting plate and the side of the connecting plate:

(1) screwing out a screw between the lower pressing plate and a fixing plate at the bottom of the cylinder, and detaching the lower pressing plate;

(2) fixing a polishing disc on the bottom of a fixing plate at the bottom of the air cylinder through screws;

(3) starting the air cylinder, controlling the polishing disc to move downwards for a set distance by the air cylinder, attaching the polishing disc to the side face of the connecting plate, enabling the polishing disc to be equivalent to the tangent plane of the connecting plate, starting the motor, driving the water pipe joint machining section to rotate by the motor, and polishing the outer side face of the bottom of the supporting plate and the side face of the connecting plate by the polishing disc at the moment to obtain the water pipe joint machining supporting section;

g. taking out the water pipe joint to process the supporting section:

(1) screwing out a screw between the polishing disc and a fixing plate at the bottom of the cylinder, and detaching the polishing disc;

(2) rotating the whole water pipe joint processing support section, and rotating the water pipe joint processing support section out of an assembly shaft of the assembly device;

h. welding a circular outer ring plate outside the connecting plate, and then welding the outer side surface of the bottom of the supporting plate and the inner side of the outer ring plate;

i. and welding the protection pipe sleeve in the mounting notch at the top of the support plate to obtain the water pipe joint.

Technical Field

The invention belongs to the technical field of central air-conditioning accessories, and particularly relates to a water pipe joint for a central air-conditioning and a manufacturing method thereof.

Background

The evaporator input and output pipe assembly of the indoor unit of the air conditioner is formed by welding a pipeline and an air conditioner pipe joint, wherein the air conditioner pipe joint is made of brass, the pipeline is made of red copper, and the red copper and the brass are made of two different materials. The air conditioner pipe joint of the existing air conditioner indoor unit has more welding leakage phenomena, and in the welding process of the air conditioner pipe joint, the air conditioner pipe joint body is melted, but the brazing filler metal of the air conditioner pipe joint body is not completely melted and permeated, so that the insufficient welding exists at partial welding positions.

In order to solve the above technical problems, chinese patent No. 2014.12.24 discloses a utility model named as an air conditioner pipe joint (patent No. CN201420839126.3), which overcomes the problems of insufficient solder and cracks after the welded pipe is welded to the external pipe.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides a water pipe joint for a central air conditioner and a manufacturing method thereof, wherein a protective pipe sleeve is sleeved at a pipe orifice of a pipe body, so that the joint of the pipe orifice and a pipeline is arranged in the protective pipe sleeve, the protective pipe sleeve plays an external protection role on the joint of the pipe orifice and the pipeline, the influence of external factors on the joint between the pipe body and the external pipeline is reduced, and the sealing performance of the joint between the pipe body and the external pipeline is ensured; meanwhile, the fixed point of the protective pipe sleeve is arranged on the surface of the hexagon nut, so that the damage to the self structure of the pipe body is avoided; and every lateral surface of hexagon nut corresponds a backup pad for evenly set up six backup pads between protection pipe box and the hexagon nut, make the protection pipe box atress even, improve the atress ability of protection pipe box simultaneously, increase the stability between body and the outside pipeline.

In the manufacturing process, because every lateral surface of hexagon nut corresponds a backup pad, just need ensure that every backup pad sets up the same position department at every lateral surface of hexagon nut, and the top surface of outer crown plate stretches out the top surface of connecting plate moreover, and the bottom surface of connecting plate is stretched out to the bottom surface of outer crown plate, leads to the welding seam length between backup pad and the connecting plate shorter, and then leads to the welding strength reduction between backup pad and the connecting plate, and welding operation is difficult for going on. Aiming at the technical problem, the pipe body, the hexagon nut and the connecting plate are integrally cast and formed, so that the pipe body, the hexagon nut and the connecting plate can be effectively connected, and the integrity and the sealing property are improved; the lower pressing plate is driven by the air cylinder, the supporting plates can be positioned in the limiting groove at the bottom of the lower pressing plate, and the lower pressing plate can control each supporting plate to be arranged at a set position on the side surface of the hexagon nut due to the fact that the air cylinder moves up and down repeatedly in the later period and the motor rotates 60 degrees in cooperation with the shape of the hexagon nut, and six supporting plates can be uniformly arranged on the hexagon nut; the invention firstly arranges the supporting plate, then arranges the outer ring plate outside the connecting plate, so that two end faces of the connecting plate have enough operating space, the part of the supporting plate exposed out of the lower pressing plate can be welded on a single side, the joint of the supporting plate and the hexagon nut is quickly welded on a full weld, the joint of the supporting plate and the connecting plate is quickly welded on a full weld, the length of the weld is ensured, the welding strength of the supporting plate on the hexagon nut and the connecting plate is improved, the single side welding is firstly adopted, the supporting plate is temporarily fixed between the hexagon nut and the connecting plate, the position of the supporting plate is determined, the position deviation of the supporting plate is avoided, then the welding is carried out on the supporting plate, the other joint of the supporting plate and the hexagon nut is welded on the other joint of the supporting plate and the connecting plate, the welding is carried out on the hexagon, the welding quality and the welding precision are improved. Because the backup pad evenly welds the back between hexagon nut and connecting plate, can be according to the position of backup pad, at the outside welding outer crown plate of connecting plate, weld the protection tube cover in the installation breach at backup pad top again, overcome water pipe head and set up outer crown plate and lead to the not enough of welding seam length of backup pad, the problem that the welding degree of difficulty increases.

In order to solve the technical problems, the invention adopts the following technical scheme:

water pipe joint for central air conditioning, including the body, the both ends of body are equipped with the mouth of pipe that is used for connecting tube, its characterized in that: still include two protection pipe casings, the protection pipe casing overlaps on orificial outside, and during the protection pipe casing was located to the junction of mouth of pipe and pipeline, the lateral surface of body was equipped with hexagon nut, and hexagon nut's lateral surface was equipped with and is the circular shape connecting plate, and the backup pad has all been welded to the top surface and the bottom surface of connecting plate, and backup pad and protection pipe casing welded fastening, every lateral surface of hexagon nut correspond a backup pad, hexagon nut's lateral surface and backup pad welded fastening. According to the invention, the pipe orifice of the pipe body is sleeved with the protection pipe sleeve, so that the joint of the pipe orifice and the pipeline is arranged in the protection pipe sleeve, the protection pipe sleeve plays an external protection role on the joint of the pipe orifice and the pipeline, the influence of external factors on the joint between the pipe body and the external pipeline is reduced, and the sealing property of the joint between the pipe body and the external pipeline is ensured; meanwhile, the fixed point of the protective pipe sleeve is arranged on the surface of the hexagon nut, so that the damage to the self structure of the pipe body is avoided; and every lateral surface of hexagon nut corresponds a backup pad for evenly set up six backup pads between protection pipe box and the hexagon nut, make the protection pipe box atress even, improve the atress ability of protection pipe box simultaneously, increase the stability between body and the outside pipeline.

Further, body, hexagon nut and connecting plate are integrative casting shaping structure, improve wholeness and leakproofness.

Furthermore, the outer side of the connecting plate is welded with a circular outer ring plate, the top surface of the outer ring plate extends out of the top surface of the connecting plate, the bottom surface of the outer ring plate extends out of the bottom surface of the connecting plate, and the outer ring plate can protect the joint between the supporting plate and the connecting plate.

Furthermore, the outer side face of the bottom of the supporting plate is an arc face, and the outer side face of the bottom of the supporting plate is welded on the inner side of the outer ring plate, so that the supporting plate and the outer ring plate are fixedly connected, and the stress capacity of the supporting plate is improved.

Furthermore, the top of the supporting plate is provided with an installation notch, and the protective pipe sleeve is welded in the installation notch. Because the protection pipe sleeve is the pipe structure, inconvenient cutting action to it, consequently to the structure of protection pipe sleeve, the top cutting of backup pad obtains the installation breach, is convenient for the fast weld of protection pipe sleeve and backup pad to fix.

Furthermore, the outer side of the supporting plate is welded with an outer side reinforcing plate, the two side parts of the outer side reinforcing plate are provided with connecting inclined planes, and the connecting inclined planes of two adjacent outer side reinforcing plates on the same circumference are mutually attached and welded and fixed. The outer side reinforcing plates on the same circumference are connected into a whole, so that the deformation of the protective pipe sleeve is prevented.

The method for manufacturing the water pipe joint for the central air conditioner is characterized by comprising the following steps:

a. and (4) integrally casting and forming the pipe body, the hexagon nut and the connecting plate in a processing plant to obtain a water pipe joint processing section.

b. Assembling a pressing device: and the support plate is positioned by adopting a pressing device, the pressing device comprises an air cylinder and a pressing plate, the two pressing plates are symmetrically fixed on the bottom of a fixed plate at the bottom of the air cylinder through screws, and the air cylinder is fixed on the machine body through screws.

c. Assembling a water pipe joint processing section: the assembling device is installed on a rotating disc of the motor, the motor is fixed on the machine body, the assembling disc of the assembling device is fixedly connected with the rotating disc through screws, a pipe orifice at one end of a pipe body of the water pipe joint machining section is connected to an assembling shaft of the assembling device in a threaded mode, the lower pressing plate is arranged above the water pipe joint machining section at the moment, and the lower pressing plate is parallel to the side face, located above, of a hexagonal nut of the water pipe joint machining section.

d. Unilateral welding of the supporting plate:

(1) and opening the air cylinder, controlling the lower pressing plate to move downwards for a set distance by the air cylinder, arranging two supporting plates on the side surface above the hexagon nut of the water pipe joint machining section, symmetrically arranging the two supporting plates, clamping the supporting plates into the limiting groove at the bottom of the lower pressing plate, tightly attaching the bottom surfaces of the supporting plates to the side surface of the connecting plate of the water pipe joint machining section, and positioning the supporting plates in the limiting groove at the bottom of the lower pressing plate.

(2) The part of the supporting plate, which is exposed out of the lower pressing plate, is subjected to unilateral welding, the joint of the supporting plate and the hexagonal nut is welded by a welding seam, meanwhile, the joint of the supporting plate and the connecting plate is welded by a welding seam, the cylinder is returned, and the lower pressing plate returns to the initial position at the moment.

(3) And (3) controlling the motor to rotate by 60 degrees, rotating the water pipe joint machining section by 60 degrees at the moment, repeating the step (1) and the step (2), and welding a supporting plate on the second side face of the hexagonal nut in a single-side mode.

(4) And (4) repeating the step (3), and performing unilateral welding on the rest side face of the hexagonal nut to form the supporting plate.

e. Repair welding the supporting plate: when the lower pressing plate returns to the initial position, the other connecting position of the supporting plate and the hexagon nut is welded by a welding line, and meanwhile, the other connecting position of the supporting plate and the connecting plate is welded by a welding line.

f. The bottom outer side of the grinding supporting plate and the side of the connecting plate:

(1) and screwing out a screw between the lower pressing plate and the fixing plate at the bottom of the cylinder, and detaching the lower pressing plate.

(2) And the polishing disc is fixed on the bottom of the fixing plate at the bottom of the cylinder through screws.

(3) The cylinder is started, the cylinder controls the polishing disc to move downwards for a set distance, the polishing disc is attached to the side face of the connecting plate at the moment, the polishing disc is equivalent to a tangent plane of the connecting plate, the motor is started again, the motor drives the water pipe joint machining section to rotate, the polishing disc polishes the bottom outer side face of the supporting plate and the side face of the connecting plate at the moment, the bottom outer side face of the supporting plate is flushed with the side face of the connecting plate, and the water pipe joint machining supporting section is obtained.

g. Taking out the water pipe joint to process the supporting section:

(1) and (4) screwing out a screw between the grinding disc and a fixing plate at the bottom of the cylinder, and detaching the grinding disc.

(2) And rotating the whole water pipe joint processing supporting section, and rotating the water pipe joint processing supporting section out of an assembling shaft of the assembling device.

h. And welding a circular outer ring plate outside the connecting plate, and then welding the outer side surface of the bottom of the supporting plate and the inner side of the outer ring plate.

i. And welding the protection pipe sleeve in the mounting notch at the top of the support plate to obtain the water pipe joint.

Due to the adoption of the technical scheme, the invention has the following beneficial effects:

1. the protective pipe sleeve is sleeved at the pipe orifice of the pipe body, so that the joint of the pipe orifice and the pipeline is arranged in the protective pipe sleeve, the protective pipe sleeve plays an external protection role on the joint of the pipe orifice and the pipeline, the influence of external factors on the joint between the pipe body and the external pipeline is reduced, and the sealing performance of the joint between the pipe body and the external pipeline is ensured; meanwhile, the fixed point of the protective pipe sleeve is arranged on the surface of the hexagon nut, so that the damage to the self structure of the pipe body is avoided; and every lateral surface of hexagon nut corresponds a backup pad for evenly set up six backup pads between protection pipe box and the hexagon nut, make the protection pipe box atress even, improve the atress ability of protection pipe box simultaneously, increase the stability between body and the outside pipeline.

2. In the manufacturing process, because every lateral surface of hexagon nut corresponds a backup pad, just need ensure that every backup pad sets up the same position department at every lateral surface of hexagon nut, and the top surface of outer crown plate stretches out the top surface of connecting plate moreover, and the bottom surface of connecting plate is stretched out to the bottom surface of outer crown plate, leads to the welding seam length between backup pad and the connecting plate shorter, and then leads to the welding strength reduction between backup pad and the connecting plate, and welding operation is difficult for going on.

Aiming at the technical problem, the pipe body, the hexagon nut and the connecting plate are integrally cast and formed, so that the pipe body, the hexagon nut and the connecting plate can be effectively connected, and the integrity and the sealing property are improved.

Adopt cylinder drive holding down plate again, can fix a position the backup pad in the spacing groove of holding down plate bottom, because later stage repetitive cylinder up-and-down motion, and the shape of motor cooperation hexagon nut rotates 60 for every backup pad of holding down plate ability control all sets up in the settlement position department of hexagon nut side, can evenly set up six backup pads on hexagon nut.

The invention is provided with the support plate firstly, and then the outer ring plate is arranged on the outer side of the connecting plate, when the support plate is arranged, the two end faces of the connecting plate have enough operating space, the part of the support plate, which is exposed out of the lower pressing plate, can be subjected to unilateral welding, the welding seam full welding is adopted at the connecting part of the support plate and the hexagon nut quickly, meanwhile, the welding seam full welding is adopted at the connecting part of the support plate and the connecting plate quickly, the length of the welding seam is ensured, and the welding strength of the support plate on the hexagon nut and.

According to the invention, firstly, single-side welding is adopted, so that the support plate is temporarily fixed between the hexagon nut and the connecting plate, the position of the support plate is determined, the situation of position deviation of the support plate is avoided, then repair welding is carried out on the support plate, the other joint of the support plate and the hexagon nut is welded by adopting a welding seam, and meanwhile, the other joint of the support plate and the connecting plate is welded by adopting a welding seam, so that the welding work of the support plate on the hexagon nut and the connecting plate is completed, and the welding quality and the.

According to the invention, the outer side surface of the bottom of the supporting plate and the side surface of the connecting plate are polished by the polishing disc, so that the outer side surface of the bottom of the supporting plate is flush with the side surface of the connecting plate, and the outer ring plate is convenient to mount in the later period. And the fixed plate at the bottom of the cylinder can be provided with a lower pressing plate and a polishing disc, so that the water pipe joint processing supporting section can be processed without changing the position of the water pipe joint processing section.

Because the backup pad evenly welds the back between hexagon nut and connecting plate, can be according to the position of backup pad, at the outside welding outer ring plate of connecting plate, weld the protection tube cover in the installation breach at backup pad top again, guaranteed the mounted position of outer ring plate and protection tube cover, overcome water pipe head and set up outer ring plate and lead to the not enough of welding seam length of backup pad, the problem that the welding degree of difficulty increases.

Drawings

The invention will be further described with reference to the accompanying drawings in which:

FIG. 1 is a schematic structural diagram of a water pipe joint for a central air conditioner according to a first embodiment of the present invention;

FIG. 2 is a schematic structural view illustrating a pipe body, a hexagon nut, and a connecting plate that are integrally cast according to a first embodiment;

FIG. 3 is a schematic structural view illustrating a welding and fastening connection between a support plate and a protective pipe sleeve according to an embodiment;

FIG. 4 is a schematic structural diagram of a first embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a supporting plate according to an embodiment;

FIG. 6 is a schematic structural view of a second embodiment of a water pipe joint for a central air conditioner according to the present invention;

FIG. 7 is a schematic structural view illustrating a support plate and a protective pipe sleeve fixedly connected by welding according to a second embodiment;

FIG. 8 is a schematic structural diagram of a supporting plate according to a second embodiment;

FIG. 9 is a schematic view of the construction of the present invention in the process section for assembling a water pipe joint;

FIG. 10 is a schematic view of the construction of the lower platen according to the present invention;

FIG. 11 is a schematic view of the present invention in a single side welded support plate configuration;

FIG. 12 is a schematic view of the present invention in a repair welding position to a support plate;

FIG. 13 is a schematic view of the present invention in a configuration for grinding the bottom outside of the support plate and the side of the connecting plate.

FIG. 14 is a schematic view of the construction of the present invention in the process of removing the support section from the water connection;

FIG. 15 is a schematic view of the present invention after welding of the outer ring plates;

fig. 16 is a schematic view of the present invention after welding of the protective shroud.

In the figure, 1-tube body; 2-pipe orifice; 3-protective pipe sleeve; 4-a hexagonal nut; 5-connecting plates; 6-a support plate; 7-outer ring plate; 8-installing a notch; 9-a pipeline; 10-an outboard stiffener plate; 11-connecting inclined plane; 12-body; 13-a cylinder; 14-a fixed plate; 15-a lower press plate; 16-an electric machine; 17-a rotating disc; 18-assembly of the tray; 19-assembling the shaft; 20-a limiting groove; 21-grinding disc.

Detailed Description

As shown in fig. 1 to 5, in the first embodiment of the water pipe joint for central air conditioner of the present invention,

the invention designs a water pipe joint for a central air conditioner, which comprises a pipe body 1, wherein pipe orifices 2 for connecting pipelines 9 are arranged at two ends of the pipe body 1, and the pipe orifices 2 are in threaded connection with the pipelines 9 under the general condition. The invention also comprises two protective pipe sleeves 3, the protective pipe sleeves 3 are sleeved on the outer sides of the pipe orifices 2, and the joints of the pipe orifices 2 and the pipelines 9 are arranged in the protective pipe sleeves 3. The lateral surface of body 1 is equipped with hexagon nut 4, and hexagon nut 4's lateral surface is equipped with and is circular shape connecting plate 5, and backup pad 6 has all been welded to the top surface and the bottom surface of connecting plate 5, and 3 welded fastening of backup pad 6 and protection tube sleeve, every lateral surface of hexagon nut 4 correspond a backup pad 6, and hexagon nut 4's lateral surface and backup pad 6 welded fastening. Body 1, hexagon nut 4 and connecting plate 5 are the cast moulding structure of an organic whole, improve wholeness and leakproofness.

According to the invention, the protection pipe sleeve 3 is sleeved at the pipe orifice 2 of the pipe body 1, so that the joint of the pipe orifice 2 and the pipeline 9 is arranged in the protection pipe sleeve 3, the protection pipe sleeve 3 plays an external protection role on the joint of the pipe orifice 2 and the pipeline 9, the influence of external factors on the joint between the pipe body 1 and the external pipeline 9 is reduced, and the sealing property of the joint between the pipe body 1 and the external pipeline 9 is ensured; meanwhile, the fixed point of the protective pipe sleeve 3 is arranged on the surface of the hexagon nut 4, so that the damage to the structure of the pipe body 1 is avoided; and every lateral surface of hexagon nut 4 corresponds a backup pad 6 for evenly set up six backup pads 6 between protection pipe box 3 and the hexagon nut 4, make protection pipe box 3 atress even, improve protection pipe box 3's atress ability simultaneously, increase the stability between body 1 and the outside pipeline 9.

The outer side of the connecting plate 5 is welded with a circular outer ring plate 7, the top surface of the outer ring plate 7 extends out of the top surface of the connecting plate 5, the bottom surface of the outer ring plate 7 extends out of the bottom surface of the connecting plate 5, and the outer ring plate 7 can protect the joint between the supporting plate 6 and the connecting plate 5. The bottom lateral surface of backup pad 6 is the arc surface, and the bottom lateral surface of backup pad 6 welds on the inboard of outer crown plate 7 for backup pad 6 and outer crown plate 7 fixed connection improve the atress ability of backup pad 6.

The top of backup pad 6 is equipped with installation breach 8, and protection tube sleeve 3 welds in installation breach 8. Because protection pipe box 3 is the pipe structure, inconvenient cutting action to it, consequently to protection pipe box 3's structure, the top cutting at backup pad 6 obtains installation breach 8, the fast weld who is convenient for protection pipe box 3 and backup pad 6 is fixed.

As shown in fig. 6 to 8, in the second embodiment of the water pipe joint for central air-conditioning of the present invention,

based on the structure of the first embodiment, the outer side of the support plate 6 of the invention is welded with the outer side reinforcing plate 10, the two side parts of the outer side reinforcing plate 10 are provided with the connecting inclined surfaces 11, and the connecting inclined surfaces 11 of two adjacent outer side reinforcing plates 10 on the same circumference are mutually attached and welded and fixed. So that the outer reinforcing plates 10 on the same circumference are integrally connected to prevent the protective sleeve 3 from being deformed.

As shown in fig. 9 to 16, the method for manufacturing a water pipe joint for a central air conditioner according to the present invention is designed based on the first embodiment, and specifically includes the following steps:

a. the pipe body 1, the hexagon nut 4 and the connecting plate 5 are integrally cast and formed in a processing plant to obtain a water pipe joint processing section (the specific structure is shown in fig. 2).

b. Assembling a pressing device: the support plate 6 is positioned by a pressing device, which comprises an air cylinder 13 and a pressing plate 15, wherein the two pressing plates 15 are symmetrically fixed on the bottom of a fixing plate 14 at the bottom of the air cylinder 13 through screws, and then the air cylinder 13 is fixed on the machine body 12 through screws (because the machine body 12 has a large volume, in order to provide a connection relationship between the pressing plates 15 and the fixing plate 14, in the attached drawings of the invention, only a part of the structure of the connection between the machine body 12 and the air cylinder 13 is cut).

c. Assembling a water pipe joint processing section: the rotating disc 17 of the motor 16 is provided with a mounting device, and the motor 16 is fixed on the machine body 12 (because the machine body 12 has a larger volume, in order to provide a connection relationship between the mounting disc and the rotating disc, in the drawings of the invention, the connection structure of the motor 16 and the machine body 12 is omitted). The assembly disc 18 and the rotating disc 17 of the assembly device are fixedly connected through screws, the pipe orifice 2 at one end of the pipe body 1 of the water pipe joint processing section is connected to an assembly shaft 19 of the assembly device in a threaded mode, the lower pressing plate 15 is arranged above the water pipe joint processing section, and the upper side face of the lower pressing plate 15 is parallel to the upper side face of the hexagonal nut 4 of the water pipe joint processing section.

d. Unilateral welding of the supporting plate 6:

(1) and opening the air cylinder 13, controlling the lower pressing plate 15 to move downwards for a set distance by the air cylinder 13, arranging two supporting plates 6 on the side surface of the hexagonal nut 4 of the water pipe joint machining section above, symmetrically placing the two supporting plates 6, clamping the supporting plates 6 into the limiting groove 20 at the bottom of the lower pressing plate 15, tightly attaching the bottom surfaces of the supporting plates 6 to the side surface of the connecting plate 5 of the water pipe joint machining section, and positioning the supporting plates 6 in the limiting groove 20 at the bottom of the lower pressing plate 15 at the moment.

(2) The part of the supporting plate 6, which is exposed out of the lower pressing plate 15, is subjected to unilateral welding, the joint of the supporting plate 6 and the hexagon nut 4 is welded by a welding seam, meanwhile, the joint of the supporting plate 6 and the connecting plate 5 is welded by a welding seam, the air cylinder 13 is returned, and the lower pressing plate 15 returns to the initial position.

(3) And (3) controlling the motor 16 to rotate by 60 degrees, rotating the water pipe joint machining section by 60 degrees at the moment, repeating the step (1) and the step (2), and welding the support plate 6 on the second side surface of the hexagonal nut 4 in a single-side mode.

(4) And (5) repeating the step (3), and performing unilateral welding on the rest side surface of the hexagonal nut 4 to form the support plate 6.

e. Repair welding the support plate 6: when the lower pressing plate 15 returns to the initial position, the other joint of the support plate 6 and the hexagon nut 4 is welded by a weld, and the other joint of the support plate 6 and the connecting plate 5 is welded by a weld.

f. The bottom outer side of the grinding support plate 6 and the side of the connecting plate 5:

(1) the screw between the lower pressing plate 15 and the fixing plate 14 at the bottom of the cylinder 13 is unscrewed, and the lower pressing plate 15 is removed.

(2) The polishing disc 21 is fixed to the bottom of the fixing plate 14 at the bottom of the cylinder 13 by screws.

(3) The cylinder 13 is started, the cylinder 13 controls the polishing disc 21 to move downwards for a set distance, the polishing disc 21 is attached to the side face of the connecting plate 5 at the moment, the polishing disc 21 is equivalent to the tangent plane of the connecting plate 5, the motor 16 is started again, the motor 16 drives the water pipe joint machining section to rotate, the polishing disc 21 polishes the outer side face of the bottom of the supporting plate 6 and the side face of the connecting plate 5 at the moment, the outer side face of the bottom of the supporting plate 6 is flush with the side face of the connecting plate 5, and the water pipe joint machining supporting section.

According to the invention, the outer side surface of the bottom of the supporting plate 6 and the side surface of the connecting plate 5 are polished by the polishing disc 21, so that the outer side surface of the bottom of the supporting plate 6 is flush with the side surface of the connecting plate 5, and the outer ring plate 7 is convenient to mount in the later period. And the fixed plate 14 at the bottom of the cylinder 13 can be provided with the lower pressing plate 15 and the polishing disc 21, so that the water pipe joint processing supporting section can be processed without changing the position of the water pipe joint processing section.

g. Taking out the water pipe joint to process the supporting section:

(1) the screw between the polishing disc 21 and the fixing plate 14 at the bottom of the cylinder 13 is unscrewed, and the polishing disc 21 is removed.

(2) And rotating the whole water pipe joint processing supporting section to rotate the water pipe joint processing supporting section out of an assembling shaft 19 of the assembling device.

h. An outer ring plate 7 having a circular shape is welded to the outer side of the connecting plate 5, and the outer side surface of the bottom of the support plate 6 and the inner side of the outer ring plate 7 are welded.

i. And welding the protective pipe sleeve 3 in the mounting notch 8 at the top of the support plate 6 to obtain the water pipe joint.

In the manufacturing process, because every lateral surface of hexagon nut 4 corresponds a backup pad 6, just need to ensure that every backup pad 6 sets up in the same position department of every lateral surface of hexagon nut 4, and the top surface of outer crown plate 7 stretches out the top surface of connecting plate 5, and the bottom surface of outer crown plate 7 stretches out the bottom surface of connecting plate 5, and the welding seam length that leads to between backup pad 6 and the connecting plate 5 is shorter, and then leads to the welding strength between backup pad 6 and the connecting plate 5 to reduce, and welding operation is difficult to go on.

Aiming at the technical problem, the pipe body 1, the hexagon nut 4 and the connecting plate 5 are integrally cast and formed, so that the pipe body 1, the hexagon nut 4 and the connecting plate 5 can be effectively connected, and the integrity and the sealing property are improved.

Adopt cylinder 13 drive holding down plate 15 again, can be with backup pad 6 location in the spacing groove 20 of holding down plate 15 bottom, because later stage repetitive cylinder 13 up-and-down motion, and motor 16 cooperates the shape of hexagon nut 4 to rotate 60 for every backup pad 6 of holding down plate 15 can be controlled and all set for the position department in the side of hexagon nut 4, can evenly set up six backup pads 6 on hexagon nut 4.

According to the invention, the support plate 6 is arranged firstly, the outer ring plate 7 is arranged on the outer side of the connecting plate 5, when the support plate 6 is arranged, the two end faces of the connecting plate 5 have enough operating space, the part of the support plate 6, which is exposed out of the lower pressing plate 15, can be subjected to single-side welding, the joint of the support plate 6 and the hexagonal nut 4 is quickly subjected to full-weld welding, meanwhile, the joint of the support plate 6 and the connecting plate 5 is quickly subjected to full-weld, the length of the weld is ensured, and the welding strength of the support plate 6 on the hexagonal nut 4 and the connecting plate 5 is.

According to the invention, firstly, single-side welding is adopted, so that the support plate 6 is temporarily fixed between the hexagon nut 4 and the connecting plate 5, the position of the support plate 6 is determined, the situation of position deviation of the support plate 6 is avoided, then repair welding is carried out on the support plate 6, the other connecting part of the support plate 6 and the hexagon nut 4 is welded by adopting a welding seam, meanwhile, the other connecting part of the support plate 6 and the connecting plate 5 is welded by adopting a welding seam, the welding work of the support plate 6 on the hexagon nut 4 and the connecting plate 5 is completed, and the welding quality and the welding.

Because backup pad 6 evenly welds the back between hexagon nut 4 and connecting plate 5, can be according to backup pad 6's position, weld outer crown plate 7 in the outside of connecting plate 5, weld protection tube sleeve 3 in the installation breach 8 at backup pad 6 top again, ensured the mounted position of outer crown plate 7 and protection tube sleeve 3, overcome water pipe head and set up outer crown plate 7 and lead to the welding seam length of backup pad 6 not enough, the problem that the welding degree of difficulty increases.

The above is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions or modifications made based on the present invention to solve the same technical problems and achieve the same technical effects are within the scope of the present invention.