WO2020199729A1

WO2020199729A1 - Seal method for pipeline of refrigeration system

Info

Publication number: WO2020199729A1
Application number: PCT/CN2020/072776
Authority: WO
Inventors: 刘建如; 许贵琳; 李伟
Original assignee: 青岛海尔电冰箱有限公司; 海尔智家股份有限公司
Priority date: 2019-03-29
Filing date: 2020-01-17
Publication date: 2020-10-08
Also published as: CN111089202A; CN111089202B

Abstract

A seal method for a pipeline of a refrigeration system. A pipeline comprises an insertion pipe (200) and a sleeve pipe (100). The seal method comprises: inserting the insertion pipe (200) into the sleeve pipe (100) to dock the two together; injecting a sealant (101) into a sealant storage cavity (310) of a seal device; and wrapping the docking position of the insertion pipe (200) and the sleeve pipe (100) using the seal device with the sealant. The seal method seals a pipeline of a refrigeration system using a combination of the sealant (101) and the seal device, avoids a plurality of problems caused by the use of flame brazing in existing refrigerators, simplifies a seal process while ensuring uniform and good seal of a pipeline, features safe operations, and is easy to execute in a standardized manner.

Description

Sealing method of refrigeration system pipeline

Technical field

The invention relates to the technical field of household appliances, and in particular to a method for sealing refrigeration system pipelines.

Background technique

Existing refrigerators generally use vapor compression refrigeration. The refrigeration system generally includes compressors, condensers, capillary tubes, evaporators, etc., which are connected by pipelines to form a sealed system. The refrigerant undergoes a phase change inside to release heat and absorb heat. Heat and cool. For the entire refrigeration system, tightness is particularly important. Once the refrigerant leaks, it will not only affect the refrigeration performance, and in addition, most of the flammable refrigerants currently used will also bring certain safety hazards.

The existing refrigeration system pipelines are generally sealed by flame brazing or lock ring connection. Among them, flame brazing has strict requirements on the operating level of operators, and the production line generally has multiple personnel welding, the overall consistency cannot be guaranteed, and more importantly, the welding requires the use of fire, which has certain hidden dangers to the safety of production. The main principle of the lock ring connection is mechanical squeeze contact, and the gap between the two connecting pipes is sealed with a sealing liquid to achieve a sealing effect. However, special operating tools are required for the compression of the lock ring, and a special space needs to be reserved for operation, which takes up a large space; and the lock ring needs to be used with a sealing liquid after being compressed, which requires more processes.

Summary of the invention

In view of the above-mentioned problems, an object of the present invention is to provide a method for sealing refrigeration system pipelines that overcomes or at least partially solves the above-mentioned problems.

A further object of the present invention is to ensure the uniformity of pipeline sealing and improve the sealing quality.

The present invention provides a method for sealing a pipeline of a refrigeration system, wherein the pipeline includes an inner tube and an outer tube, and the sealing method includes:

Insert the inner cannula into the outer sleeve to connect the two;

Inject the sealant into the glue storage cavity of the sealing device;

A sealing device with glue is used to cover the butt joint of the inner cannula and the outer cannula.

Optionally, after the step of covering the butt joint between the inner cannula and the outer sleeve with a sealing device with glue, the method further includes:

The sealing device is allowed to stand for a preset time to allow the sealant to cure.

Optionally, the sealant includes a main agent and a curing agent;

The steps of injecting sealant into the glue storage cavity of the sealing device include:

Use a glue gun with a double-out glue gun head to mix the main agent and curing agent at the double-out glue gun head according to the preset weight ratio, and align the double-out glue gun head at the glue storage cavity, and mix the main agent And the curing agent is injected into the glue storage cavity.

Optionally, the preset weight ratio is 3:1 to 5:1.

Optionally, before the step of covering the butt joint between the inner cannula and the outer sleeve with a sealing device with glue, the method further includes:

Check whether the joint between the inner tube and the outer tube is clean;

If there are stains on the butt, clean the butt.

Optionally, when the butt joint between the inner cannula and the outer sleeve is covered by the sealing device with glue, the butt joint is located in the middle of the glue storage cavity.

Optionally, the sealing device is made of flexible material.

Optionally, the sealing device has two side wings located on opposite sides of the glue storage cavity, one of the two side wings is formed with a buckle, and the other side wing is formed with a slot for engaging with the buckle adapter;

The steps of covering the butt joint between the inner cannula and the outer cannula with a sealing device with glue specifically include:

Move the sealing device to the butt of the inner cannula and outer sleeve, so that the two side wings are located on both sides of the pipeline extension direction;

The two side wings are superimposed, and the buckle is buckled with the groove, so that the sealing device is molded into a cylindrical shape covering the outer side of the butt joint between the outer tube and the inner tube.

Optionally, the glue storage cavity is wrapped around the butt joint and formed into a spindle shape.

Optionally, the sealing device further has two sealing sections located at both ends of the extension direction of the glue storage cavity;

Each sealing section has an arc-shaped groove, and two side wings respectively extend to both sides of the two arc-shaped grooves;

When the two side wings are superimposed, the two arc-shaped grooves are formed into a cylindrical shape covering the outer peripheral wall of the pipeline, and are attached to the outer peripheral wall of the pipeline.

The sealing method of the refrigeration system pipeline of the present invention uses a sealant combined with a sealing device to seal the refrigeration system pipeline, avoids many problems caused by flame brazing in the existing refrigerator, and ensures uniform and good sealing of the pipeline At the same time, the operation is safe, the sealing process is simplified, and the standardization is easy to implement.

Further, in the sealing method of the refrigeration system pipeline of the present invention, a specially designed sealing device is used to seal the pipeline, which ensures the uniformity of the sealant distribution at the joints of the pipeline and improves the sealing quality of the pipeline.

Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will better understand the above and other objectives, advantages and features of the present invention.

Description of the drawings

Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary but not restrictive manner with reference to the accompanying drawings. The same reference numerals in the drawings indicate the same or similar components or parts. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the attached picture:

Fig. 1 is a schematic diagram of the appearance of a refrigeration system pipeline with a sealing device according to an embodiment of the present invention;

Figure 2 is a partial schematic view of a sealing device according to an embodiment of the present invention;

3 is a schematic cross-sectional view of a refrigeration system pipeline with a sealing device according to an embodiment of the present invention;

Figure 4 is a schematic diagram of a method for sealing a refrigeration system pipeline according to an embodiment of the present invention; and

Fig. 5 is a flowchart of a method for sealing a pipeline of a refrigeration system according to an embodiment of the present invention.

detailed description

This embodiment provides a method for sealing a pipeline of a refrigeration system, where the refrigeration system is a refrigeration system of a refrigeration equipment, and the refrigeration equipment may be a refrigerator, a freezer, and other equipment with refrigeration and/or freezing functions.

As shown in Figures 1 and 2, the pipeline may include an inner cannula 200 and an outer sleeve 100. The inner cannula 200 is inserted into the outer sleeve 100 and is connected to the outer sleeve 100 to connect the inner cannula 200 and the outer sleeve 100. The butt joint is sealed. In this embodiment, a new type of sealing device 300 is used to seal the butt joint. Wherein, the butt joint may be a part where the butt end of the outer sleeve 100 and the inner cannula 200 overlaps with the inner cannula 200.

Specifically, as shown in FIGS. 2 and 3, the sealing device 300 has a glue storage cavity 310 for containing the sealant 101 and two side wings 320 located on opposite sides of the glue storage cavity 310. One of the two side wings 320 The side wing 320 is formed with a buckle 321, and the other side wing 320 is formed with a groove 322 that is adapted to engage with the buckle 321.

After the sealant 101 is injected into the glue storage cavity 310, the sealing device 300 is moved to the butt of the inner cannula 200 and the outer sleeve 100, so that the two side wings 320 are located on both sides of the pipeline extension direction; and the two side wings 320 Overlapping, the buckle 321 is buckled with the groove 322, so that the sealing device 300 is molded into a cylindrical shape covering the outer side of the butt joint between the outer sleeve 100 and the inner cannula 200.

The sealing device 300 may be made of a flexible material, such as plastic, so as to ensure that the sealing device has a certain degree of flexibility and facilitate the superposition of the two side wings 320.

Figure 1 shows a state diagram of the sealant 101 being injected into the glue storage cavity 310, and the sealing device 300 is laminated and covered on the outside of the pipeline. Figure 2 shows a partial schematic diagram of the expanded state of the sealing device 300, Figure 3 A schematic cross-sectional view of the sealing device 300 covering the outside of the pipeline is shown.

The center line of the extension direction of the glue storage cavity 310 is parallel to the extension direction of the pipeline, and the size of the extension direction of the glue storage cavity 310 can be larger than the size of the joint between the outer sleeve 100 and the inner cannula 200, as shown in Figures 1 and 3, The size of the extension direction of the glue cavity 310 is much larger than the size of the joint to ensure the volume of the glue storage cavity 310, the volume of the sealant 101 injected into the glue storage cavity 310 and the sealant 101 on the outer peripheral wall and inside of the outer sleeve 100 The outer peripheral wall of the cannula 200 and the distribution area of the joint between the outer cannula 100 and the inner cannula 200 can increase the sealing of the pipeline.

The size of the glue storage cavity 310 is tapered from the middle to the two ends of the extending direction, so that the size of the middle area of the glue storage cavity 310 can be maximized, which can store more sealant, and the size of the two ends of the glue storage cavity 310 is smaller. Small, easy to match with the outer peripheral wall of the pipeline to ensure tightness. For example, as shown in FIG. 1 and FIG. 3, the glue storage cavity 310 can be formed into a spindle shape by covering the butt joint to ensure the uniformity of the sealant 101 in the circumferential direction of the same area of the pipeline.

As shown in FIG. 3, the sealing device 300 also has two sealing sections 330 located at both ends of the extending direction of the glue storage cavity 310, each sealing section 330 has an arc-shaped groove, and the two side wings 320 respectively extend to two arc-shaped grooves. When the two side wings 320 overlap, the two arc-shaped grooves can be formed into a cylindrical shape covering the outer circumferential wall of the pipeline, and the inner circumferential wall of the sealing section 330 and the outer circumference of the pipeline are formed into a cylindrical shape. Wall fit.

In other words, the sealing section 330 at one end of the sealing device 300 is molded into a cylindrical shape covering the outer peripheral wall of the outer sleeve 100, and the inner peripheral wall of the cylindrical sealing section 330 is attached to the outer peripheral wall of the outer sleeve 100. Correspondingly, the sealing section 330 at the other end of the sealing device 300 is molded into a cylindrical shape covering the outer peripheral wall of the inner cannula 200, and the inner peripheral wall of the cylindrical sealing section 330 is attached to the outer peripheral wall of the inner cannula 200. Therefore, by adding the two sealing sections 330 specially designed as described above, the sealing performance between the two ends of the sealing device 300 and the outer peripheral wall of the pipeline is ensured, and the leakage of the sealant 101 is avoided. In addition, since the arc surface of the sealing section 330 can be evenly attached to the outer peripheral wall of the pipeline, it is ensured that the sealant 101 at the connection between the inner cannula 200 and the outer sleeve 100 is evenly distributed in the front, back, left, and right, and no local defects will occur. The risk of glue further ensures the tightness of the pipeline.

The sealant 101 is a two-component polyurethane adhesive, which is a type of adhesive containing urethane groups (-NHCOO-) in the molecular chain formed by addition polymerization of isocyanate and polyether or polyester polyol. The sealant 101 includes a main agent and a curing agent, the main agent is a polyol, and the curing agent is an isocyanate containing an isocyanate group (-NCO). The main agent and curing agent are mixed and cured by addition polymerization to form a thermosetting plastic or elastomer. The advantages of the sealant 101 are high bonding strength, fast curing, high peel strength, impact resistance, vibration resistance, fatigue resistance, high temperature resistance, oil resistance, solvent resistance, good weather resistance, easy storage, and field Mixing glue, simple process and high production efficiency.

Fig. 4 is a schematic diagram of a method for sealing a pipeline of a refrigeration system according to an embodiment of the present invention.

As shown in FIG. 4, based on the aforementioned refrigeration system pipeline and sealing device 300, the sealing method of the refrigeration system pipeline of this embodiment specifically includes:

Step S402, insert the inner cannula 200 into the outer cannula 100 to connect the two;

Step S404, inject the sealant 101 into the glue storage cavity 310 of the sealing device 300;

In step S406, the joint between the inner cannula 200 and the outer cannula 100 is covered by the sealing device 300 with glue.

When the sealing device 300 with glue is used to cover the butt joint between the inner cannula 200 and the outer sleeve 100, the butt joint can be located in the middle of the glue storage cavity 310, so that the upstream and downstream areas of the butt joint are covered by the glue storage cavity 310 The covered area is approximately the same, which is beneficial to improve the sealing effect.

The above sealing method can be realized by a manipulator combined with an image recognition method. Specifically, the manipulator inserts the inner cannula 200 into the outer sleeve 100 to a certain depth and connects the two. The depth of the inner cannula 200 inserted into the outer sleeve 100 can be greater than 5 mm. For example, the depth dimension is 8mm or more.

At the same time, the glue injection gun injects the sealant 101 into the glue storage cavity 310 of the sealing device 300. According to the internal volume of the glue storage cavity 310 of the sealing device 300, the amount of glue injected by the glue gun can be preset, which is beneficial to standardization. carried out.

The image recognition device automatically recognizes the position of the connection between the outer sleeve 100 and the inner cannula 200, and sends the position information to the manipulator. The manipulator moves the sealing device 300 to the pipeline, so that the butt of the outer sleeve 100 and the inner cannula 200 is located The middle part of the glue storage chamber 310 of the sealing device 300 is sealed, and the sealing device 300 is operated so that the sealing device 300 covers the butt joint between the inner cannula 200 and the outer sleeve 100.

After the sealing device 300 is used to cover the joint between the inner cannula 200 and the outer sleeve 100, the sealing device 300 is allowed to stand for a preset time, for example, for 6 hours or more, waiting for the sealant 101 to solidify.

In this embodiment, the sealant 101 adopts a two-component polyurethane adhesive containing a main agent and a curing agent. Before the glue is injected, the main agent and the curing agent are stored in different containers separately. When the sealant is injected, a certain amount of main agent and a certain amount of curing agent can be poured into the two glue nozzle heads of the glue injection gun. The step of injecting the sealant 101 into the glue storage cavity 310 of the sealing device 300 may specifically include:

Use a glue gun with double-out glue gun heads to mix the main agent and curing agent at the double-out glue gun head according to the preset weight ratio, and align the double-out glue gun head at the glue storage cavity 310, The agent and curing agent are injected into the glue storage cavity 310.

The preset weight ratio may range from 3:1 to 5:1, for example, the preset weight ratio is 4:1.

Before the step of covering the butt joint between the inner cannula 200 and the outer sleeve 100 with the sealing device 300 with glue, the method further includes: detecting whether the butt joint between the inner cannula 200 and the outer sleeve 100 is clean, if there is dirt or oil at the butt joint. Clean the butt joint to ensure the bonding force between the joint and the sealant. Specifically, the image recognition device recognizes the butt joint between the inner cannula 200 and the outer sleeve 100, collects an image of the butt joint, and compares the collected image with a standard image to determine whether there is a stain at the joint. The plasma gun can be controlled to spray plasma water to the butt joint to clean the butt joint and its surrounding area, and then proceed to the next step. Among them, the standard image is a pre-collected image of a clean butt joint.

Fig. 5 exemplarily shows a flowchart of a method for sealing a refrigeration system pipeline according to an embodiment of the present invention.

As shown in FIG. 5, the sealing method of the refrigeration system pipeline of this embodiment includes:

Step S502, insert the inner cannula 200 into the outer cannula 100 to connect the two;

Step S504, detecting whether the butt joint between the inner cannula 200 and the outer sleeve 100 is clean, if the butt joint is clean, switch to step S508, and if there is dirt at the butt joint, switch to step S506;

Step S506, cleaning the docking place;

Step S508, using a glue injection gun with double glue gun heads to mix the main agent and curing agent at the double glue gun head according to the weight ratio of 4:1, and align the double glue gun head with the glue storage cavity 310 , Inject the mixed main agent and curing agent into the glue storage cavity 310;

Step S510, move the sealing device 300 to the butt joint between the inner cannula 200 and the outer sleeve 100, so that the butt joint is located in the middle of the glue storage cavity 310, and the two side wings 320 are located on both sides of the pipeline extension direction;

Step S512, superimpose the two side wings 320, and buckle the buckle 321 with the groove 322, so that the sealing device 300 is molded into a cylindrical shape covering the outer side of the butt joint between the outer sleeve 100 and the inner cannula 200;

In step S514, the sealing device 300 is allowed to stand for 10 minutes, so that the sealant 101 is cured.

In this embodiment, the specially designed sealing device 300 is used in conjunction with the specially designed sealing process to achieve good sealing of the pipeline with the sealant 101, avoiding many problems caused by flame brazing in the existing refrigerator, and ensuring that the pipeline While the road is evenly sealed and well sealed, the operation is safe, the sealing process is simplified, and it is easy to standardize implementation.

So far, those skilled in the art should realize that although a number of exemplary embodiments of the present invention have been illustrated and described in detail herein, they can still be disclosed according to the present invention without departing from the spirit and scope of the present invention. The content directly determines or deduces many other variations or modifications that conform to the principles of the present invention. Therefore, the scope of the present invention should be understood and deemed to cover all these other variations or modifications.

Claims

A method for sealing a pipeline of a refrigeration system, the pipeline comprising an inner cannula and an outer sleeve, and the sealing method includes:

Insert the inner cannula into the outer sleeve to connect the two;

Inject the sealant into the glue storage cavity of the sealing device;

A sealing device with glue is used to cover the butt joint of the inner cannula and the outer cannula.
The sealing method according to claim 1, wherein

After the step of covering the joint between the inner cannula and the outer cannula with a sealing device with glue, the method further includes:

The sealing device is allowed to stand for a preset time so as to cure the sealant.
The sealing method according to claim 1, wherein

The sealant includes a main agent and a curing agent;

The step of injecting the sealant into the glue storage cavity of the sealing device includes:

Use a glue gun with a double-out glue gun head to mix the main agent and the curing agent at the double-out glue gun head according to a preset weight ratio, and align the double-out glue gun head at all In the glue storage cavity, the mixed main agent and the curing agent are injected into the glue storage cavity.
The sealing method according to claim 3, wherein

The preset weight ratio is 3:1 to 5:1.
The sealing method according to claim 1, wherein

Before the step of covering the joint between the inner cannula and the outer sleeve with a sealing device with glue, the method further includes:

Detecting whether the joint between the inner cannula and the outer sleeve is clean;

If there are stains on the butt joint, clean the butt joint.
The sealing method according to claim 1, wherein

When a sealing device with glue is used to cover the butt joint between the inner cannula and the outer sleeve, the butt joint is located in the middle of the glue storage cavity.
The sealing method according to claim 1, wherein

The sealing device is made of flexible material.
The sealing method according to claim 1, wherein

The sealing device has two side wings located on opposite sides of the glue storage cavity, one of the side wings is formed with a buckle, and the other side wing is formed with an adapter card that is connected to the buckle. Closed card slot;

The step of covering the butt joint between the inner cannula and the outer cannula with a sealing device with glue specifically includes:

Moving the sealing device to the butt joint of the inner cannula and the outer sleeve, so that the two side wings are located on both sides of the extension direction of the pipeline;

The two side wings are superimposed, and the buckle is buckled with the groove, so that the sealing device is molded into a cylindrical shape covering the outer side of the butt joint of the outer sleeve and the inner cannula .
The sealing method according to claim 8, wherein

The glue storage cavity is wrapped around the butt joint and formed into a spindle shape.
The sealing method according to claim 8, wherein

The sealing device also has two sealing sections located at both ends of the extension direction of the glue storage cavity;

Each of the sealing segments has an arc-shaped groove, and the two side wings respectively extend to two sides of the two arc-shaped grooves;

When the two side wings are superimposed, the two arc-shaped grooves are formed into a cylindrical shape covering the outer peripheral wall of the pipeline, and are attached to the outer peripheral wall of the pipeline.