A pipe joint connection assembly for direct drinking water equipment pipe network pipeline

Abstract

The present invention discloses a pipe joint connection assembly for a pipe network pipeline of a direct drinking water equipment, and relates to the technical field of pipe joints. A pipe joint connection assembly for a pipe network pipeline of a direct drinking water equipment, comprising a pipe joint part, and also comprising: an outer layer tube sleeved on the pipe joint part, the middle part of the outer layer tube being connected to the pipe joint part, so as to form two sealing cavities with U-shaped cross-sections between the pipe joint part and the outer layer tube; while the device improves the sealing effect of the stainless steel pipe by setting a U-shaped sealing path, it can automatically feedback the sealing performance of the pipe joint part and the outer layer tube according to the setting of the leak detection seam, and because the leak detection seam is located in the middle of the U-shaped sealing path, when a water leakage is discovered, the other half of the U-shaped sealing path can continue to play a sealing role, thereby avoiding large flow water leakage when it is discovered, and secondly, during the water leakage process, the leak detection seam can also be automatically closed under the influence of water pressure to avoid long-term water leakage.

Description

Technical Field

[0001] The invention belongs to the technical field of pipe joints, and in particular relates to a pipe joint connection assembly for a pipe network pipeline of a direct drinking water equipment. Background Art

[0002] Direct drinking water equipment is a device that can purify municipal tap water or other water sources into direct drinking water, also known as terminal water purification equipment, which mainly provides users with clean water that can be directly drunk; direct drinking water equipment usually adopts multi-stage filtration and disinfection units to remove pollutants in water by physical or chemical methods; therefore, direct drinking water equipment is widely used in various places, including but not limited to public places such as office buildings, schools, hospitals, residential areas, hotels, restaurants, airports, stations, and private places such as homes;

[0003] During the installation and use of the direct drinking water equipment, it is necessary to connect the water outlet of the direct drinking water equipment with the user through a pipe, and during the laying of the pipe, a pipe joint is needed to connect the pipes. The existing laid pipes mostly use stainless steel compression pipes, which are connected by squeezing the pipes through compression. However, due to the limitations of the compression process and the level of the operators, and the small direct contact area between the existing compression sleeve and the water pipe, water can easily seep out from the gap between the compression sleeve and the water pipe under the action of water pressure. Therefore, a pipe joint connection assembly for the pipe network of the direct drinking water equipment is proposed to avoid the problem of poor sealing of the compression connection due to the compression process, improper operation of the operator, the existing compression sleeve structure design, etc., thereby improving the sealing effect of the compression connection. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a pipe joint connection assembly for a pipe network pipeline of a direct drinking water equipment that can overcome the above problems or at least partially solve the above problems.

[0005] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: a pipe joint connection assembly for a pipe network pipeline of a direct drinking water equipment, including a pipe joint part, and also including: an outer layer tube sleeved on the pipe joint part, the middle part of the outer layer tube is connected to the pipe joint part, so as to form two sealing cavities with U-shaped cross-sections between the pipe joint part and the outer layer tube, and the stainless steel pipes are respectively inserted into the sealing cavities from both ends of the pipe joint part to form a U-shaped sealing path on one end of the stainless steel pipe; a corrugated area is arranged at the middle part of the outer layer tube near the pipe joint part, and a water storage area is formed between the inner wall of the corrugated area and the outer wall of the pipe joint part; a leak detection seam is opened on the outer periphery of the corrugated area near the middle part of the pipe joint part, the leak detection seam is located on the arc top of the corrugated area, the leak detection seam is connected with the water storage area, when water penetrates into the water storage area, water overflows from the leak detection seam, so as to prompt that the sealing performance of the pipe joint part and the outer layer tube is reduced; when the water pressure in the water storage area increases, the corrugated area deforms to squeeze the leak detection seam to achieve closure.

[0006] Furthermore, first sealing grooves are provided on the outer circumferences of both ends of the pipe joint, a sealing ring is sleeved in the first sealing groove, and a pressure ring is provided on the inner wall of the outer layer tube, and the pressure ring corresponds to the first sealing groove.

[0007] Furthermore, engaging grooves are provided on the outer circumferences of both ends of the pipe joint, and pressing teeth are provided on the inner wall of the outer tube, and the pressing teeth correspond to the engaging grooves.

[0008] Furthermore, the two inner walls of the occlusal groove are both inclined, and the inclination angle of the side wall of the pressing tooth is the same as the inclination angle of the side wall of the occlusal groove.

[0009] Furthermore, a second sealing groove is provided on the outer circumference of both ends of the pipe joint, and the second sealing groove is located on one side of the bite groove.

[0010] Furthermore, it also includes a symmetrically arranged end cover, which consists of a first straight wall portion and a second straight wall portion. The end cover is threadedly connected to the outer periphery of one end of the pipe fitting through the first straight wall portion, and the second straight wall portion on the end cover is located between the inner wall of the outer tube and the outer wall of the pipe fitting.

[0011] Furthermore, a sealing gasket is provided on the outer wall of the second straight wall portion, and the sealing gasket is in contact with the outer wall of the stainless steel tube.

[0012] Furthermore, a spiral groove is provided on the inner wall of the pipe joint at one end in the water outflow direction, and one end of the spiral groove passes through one end of the pipe joint; the inner diameter of the pipe joint is smaller than the inner diameter of the stainless steel pipe, and the pipe joint and the stainless steel pipes at both ends of the pipe joint are divided into a pressurized zone, a smooth zone, a vortex zone, and a release zone through the spiral groove, and the length of the vortex zone is the same as the cross-sectional length of the spiral groove.

[0013] Preferably, the length of the pipe joint is L, the length of the flat zone is L1, and the length of the swirl zone is L2.

[0014] L=L1+L2,

[0015] L2=(2 / 5)L.

[0016] Preferably, the circumference of the leak detection gap is C1, and the circumference of the outer wall of the outer tube is C.

[0017] C1=1 / 10C.

[0018] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art: the present device improves the sealing path of the stainless steel pipe by setting the U-shaped sealing path, and can increase the contact area with the stainless steel pipe during the clamping process compared with the prior art, thereby effectively improving the sealing effect, and can automatically feedback the sealing performance of the pipe joint and the outer layer pipe according to the setting of the leak detection seam, and because the leak detection seam is located in the middle of the U-shaped sealing path, when the water leakage is discovered, the other half of the U-shaped sealing path can continue to play a sealing role, thereby avoiding large flow water leakage when it is discovered, and secondly, during the water leakage process, the leak detection seam can also be automatically closed under the influence of water pressure to avoid long-term water leakage;

[0019] When water is about to enter the pipe joint from the stainless steel pipe, the water pressure at the right end of the pipe joint will increase due to the change in the smaller diameter. The increase in water pressure will increase the pressure between the right end of the pipe joint and the stainless steel pipe, which will weaken the sealing of the right end of the pipe joint. The pressurized water will enter the vortex area, that is, the spiral groove, through the diversion of the flat area. The water flow will generate a vortex due to the shape of the spiral groove and accelerate from the left end of the pipe joint into the stainless steel pipe located on the left side of the pipe joint. This increases the flow rate in the pipe joint and further reduces the water pressure in the pressurized area.

[0020] Secondly, when the water in the swirl area enters the release area, due to the large inner diameter of the release area, the water pressure passing through the pipe joint is weakened in the release area, which is beneficial to reduce the sealing effect of the left end of the pipe joint affected by the water pressure. Secondly, the water in the release area is in a swirl shape, which can take away the bubbles accumulated at the connection between the left end of the pipe joint and the stainless steel pipe, avoiding the resistance of water flow caused by bubbles remaining at one end of the pipe joint, and avoiding the corrosion and accelerated aging of the connection between the pipe joint and the stainless steel pipe caused by bubbles.

[0021] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In the attached picture:

[0023] Figure 1A schematic diagram of the structure of a pipe joint member and an outer layer pipe of a pipe joint connection assembly for a pipe network pipeline of a direct drinking water equipment proposed by the present invention;

[0024] Figure 2 This is a structural schematic diagram of an end cover of a pipe joint connection assembly for a pipe network pipeline of a direct drinking water equipment proposed by the present invention;

[0025] Figure 3 A pipe joint connection assembly for a pipe network pipeline of a direct drinking water equipment proposed by the present invention Figure 2 The structural diagram at A in the middle;

[0026] Figure 4 A pipe joint connection assembly for a pipe network pipeline of a direct drinking water equipment proposed by the present invention Figure 2 The structural diagram at B in the middle;

[0027] Figure 5 This is a structural schematic diagram of a pressurization zone, a flat zone, a swirl zone, and a release zone of a pipe joint connection assembly for a pipe network pipeline of a direct drinking water equipment proposed by the present invention;

[0028] Figure 6 A pipe joint connection assembly for a pipe network pipeline of a direct drinking water equipment proposed by the present invention Figure 5 Schematic diagram of the structure at C in the middle;

[0029] Figure 7 This is a structural schematic diagram of a corrugated area of ​​a pipe joint connection assembly for a pipe network pipeline of a direct drinking water equipment proposed by the present invention;

[0030] Figure 8 This is a structural schematic diagram of a spiral groove of a pipe joint connection assembly for a pipe network pipeline of a direct drinking water equipment proposed by the present invention;

[0031] Fig. 9 A schematic diagram of the structure of a leak detection seam of a pipe joint connection assembly for a pipe network pipeline of a direct drinking water equipment proposed by the present invention;

[0032] Fig.10 Indicates the direction of force Figure 1 ;

[0033] Fig.11 Indicates the direction of force Figure 2 .

[0034] In the figure: 1. pipe joint; 10. stainless steel pipe; 11. first sealing groove; 12. sealing ring; 13. bite groove; 14. second sealing groove; 15. spiral groove; 2. outer tube; 20. sealing cavity; 21. pressure ring; 22. pressure teeth; 23. corrugated area; 24. water storage area; 25. leak detection gap; 3. end cover; 31. first straight wall portion; 32. second straight wall portion; 33. sealing gasket; 4. pressurization area; 5. flat area; 6. vortex area; 7. release area. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0036] The following is combined with Figure 1 -Attached Fig.11 , describes in detail the technical solutions provided by each embodiment of the present invention.

[0037] Example 1: Reference Figure 1-Figure 11 A pipe joint connection assembly for a pipe network pipeline of a direct drinking water equipment includes a pipe joint member 1, and also includes: an outer layer tube 2 sleeved on the pipe joint member 1, the middle part of the outer layer tube 2 is connected to the pipe joint member 1, and two sealing cavities 20 with U-shaped cross sections are formed between the pipe joint member 1 and the outer layer tube 2, and a stainless steel pipe 10 is respectively inserted into the sealing cavity 20 from both ends of the pipe joint member 1 to form a U-shaped sealing path on one end of the stainless steel pipe 10; a corrugated area 23, which is arranged on the outer layer tube 2 near the pipe joint member 1 In the middle, a water storage area 24 is formed between the inner wall of the corrugated area 23 and the outer wall of the pipe joint 1; a leak detection seam 25 is provided on the outer periphery of the corrugated area 23 near the middle of the pipe joint 1, the leak detection seam 25 is located on the arc top of the corrugated area 23, and the leak detection seam 25 is connected with the water storage area 24. When water penetrates into the water storage area 24, the water overflows from the leak detection seam 25, which is used to indicate that the sealing performance of the pipe joint 1 and the outer layer pipe 2 is reduced; when the water pressure in the water storage area 24 increases, the corrugated area 23 deforms to squeeze the leak detection seam 25 to achieve closure;

[0038] A first sealing groove 11 is provided on the outer circumference of both ends of the pipe joint 1, a sealing ring 12 is sleeved in the first sealing groove 11, and a pressure ring 21 is provided on the inner wall of the outer tube 2, the pressure ring 21 corresponds to the first sealing groove 11;

[0039] The outer circumference of both ends of the pipe joint 1 is provided with a bite groove 13, and the inner wall of the outer tube 2 is provided with a pressing tooth 22, and the pressing tooth 22 corresponds to the bite groove 13;

[0040] A second sealing groove 14 is provided on the outer periphery of both ends of the pipe joint 1, and the second sealing groove 14 is located on one side of the bite groove 13;

[0041] When in use, insert one end of the two stainless steel pipes 10 to be connected into the U-shaped sealing cavity 20 between the pipe joint 1 and the outer pipe 2. When inserting, one end of the stainless steel pipe 10 does not touch the connection between the middle of the outer pipe 2 and the pipe joint 1, that is, the bottom wall of the sealing cavity 20. It is necessary to leave a certain distance between one end of the stainless steel pipe 10 and the middle part of the outer pipe 2.

[0042] Then, a crimping tool is used to crimp the two ends of the pipe joint 1, respectively, so that the stainless steel pipe 10 is tightly pressed between the pipe joint 1 and the outer tube 2. When the crimping tool is crimped, the pressure ring 21 on the inner wall of the outer tube 2 enters the first sealing groove 11 and squeezes the sealing ring 12 in the first sealing groove 11, so as to perform a primary seal between the inner wall of the stainless steel pipe 10 and the outer wall of the pipe joint 1.

[0043] The pressing teeth 22 will enter the second sealing groove 14 to achieve secondary sealing between the inner wall of the stainless steel pipe 10 and the outer wall of the pipe joint 1, and the inner wall of the U-shaped sealing cavity 20 will contact the stainless steel pipe 10 to achieve a U-shaped sealing path, thereby extending the contact area with the stainless steel pipe 10 and thus extending the sealing path, improving the sealing effect on the stainless steel pipe 10, and achieving a tertiary sealing effect.

[0044] When using the crimping tool for crimping operation, it should be noted that the crimping tool only needs to crimp the area between the corrugated area 23 and the end of the outer tube 2, so that the shape of the corrugated area 23 will not change, thereby avoiding deformation of the leak detection seam 25, and at the same time, there is a water storage area 24 with sufficient space between the corrugated area 23 and one end of the stainless steel tube 10 located in the sealing cavity 20;

[0045] During use, if the sealing performance between the inner wall of the stainless steel pipe 10 and the outer wall of the pipe joint 1 is reduced, water will seep through the sealing cavity 20 between the inner wall of the stainless steel pipe 10 and the outer wall of the pipe joint 1. If the water wants to leak out, it needs to pass through the U-shaped sealing path before it can leak out from one end of the outer layer pipe 2. Therefore, the U-shaped sealing path can well extend the sealing path, so that when the sealing performance between the inner wall of the stainless steel pipe 10 and the outer wall of the pipe joint 1 is reduced, the sealing effect can still be achieved by relying on the sealing path between the outer wall of the stainless steel pipe 10 and the outer layer pipe 2.

[0046] When water enters the corrugated area 23, that is, the water storage area 24, since the leak detection seam 25 is connected to the water storage area 24, the water that has penetrated into the water storage area 24 will overflow from the leak detection seam 25, and the overflowed water will adhere to the outer layer tube 2, and will form water droplets on the outer layer tube 2, and a watermark will also be formed on the bottom surface below the outer layer tube 2, so that maintenance personnel can find out in time that the sealing effect of the pipe joint 1 is reduced during routine maintenance;

[0047] In the present device, the leak detection seam 25 is arranged in the middle of the U-shaped sealing path, so that when the sealing effect is reduced, it can be discovered in time, and in the process from discovery to maintenance and replacement, the other half of the U-shaped sealing path can continue to play a sealing role, thereby avoiding large flow leakage when it is discovered;

[0048] The leak detection slot 25 can be formed by laser cutting to reduce the width of the leak detection slot 25 and prevent dust outside the leak detection slot 25 from entering the water storage area 24.

[0049] When water continues to infiltrate into the water storage area 24, the water pressure increases, and the water will continue to penetrate outward through the outer wall of the stainless steel tube 10 and the inner wall of the outer tube 2. In this process, the water pressure will exert an axial driving force and a circumferential expansion force on the outer tube 2. When the circumferential expansion force is exerted, the corrugated area 23 will be affected by the expansion force and deform. Since the leak detection gap 25 is opened on the arc top of the corrugated area 23, when the corrugated area 23 expands and deforms outward, it will squeeze the leak detection gap 25, so that the leak detection gap 25 is closed (refer to Fig. 9 , Fig.10 ), and then after watermarks and water drops are formed on the outer tube 2 and watermarks are formed on the ground, the leak detection seam 25 is closed in time to avoid long-term water leakage;

[0050] The water pressure exerts an axial driving force on the outer tube 2 because when water penetrates outward from between the outer wall of the stainless steel tube 10 and the inner wall of the outer tube 2, the water is blocked by the pressure ring 21 and the pressure teeth 22, which pushes the outer tube 2 to extend in the axial direction, so that the corrugated area 23 is stretched and deformed, and then the leak detection gap 25 located on the arc top of the corrugated area 23 is blocked, thereby preventing water from leaking outward from the leak detection gap 25 for a long time;

[0051] Therefore, while the device improves the sealing effect of the stainless steel pipe 10 by setting a U-shaped sealing path, it can automatically feedback the sealing performance of the pipe joint 1 and the outer layer pipe 2 according to the setting of the leak detection seam 25. Moreover, since the leak detection seam 25 is located in the middle of the U-shaped sealing path, when a leak is discovered, the other half of the U-shaped sealing path can continue to play a sealing role, thereby avoiding large-flow leakage when it is discovered. Secondly, during the leakage process, the leak detection seam 25 can also be automatically closed due to the influence of water pressure to avoid long-term leakage.

[0052] Example 2: Reference Figure 1 , Figure 2 , Figure 3 , Figure 7, a pipe joint connection assembly for a pipe network pipeline of a direct drinking water equipment, which is basically the same as that of Example 1, and further includes: it also includes a symmetrically arranged end cover 3, the end cover 3 is composed of a first straight wall portion 31 and a second straight wall portion 32, the end cover 3 is threadedly connected to the outer periphery of one end of the pipe joint 1 through the first straight wall portion 31, and the second straight wall portion 32 on the end cover 3 is located between the inner wall of the outer layer tube 2 and the outer wall of the pipe joint 1; a sealing gasket 33 is arranged on the outer wall of the second straight wall portion 32, and the sealing gasket 33 is in contact with the outer wall of the stainless steel pipe 10;

[0053] When in use, the end cap 3 is firstly screwed onto the two ends of the pipe joint 1 , and when the stainless steel pipe 10 is put on and pressed, the end cap 3 is connected synchronously, so that the sealing gasket 33 is tightly connected to the outer wall of the stainless steel pipe 10 .

[0054] Example 3: Reference Figure 3 , a pipe joint connection assembly for a pipe network of a direct drinking water equipment, which is basically the same as that of Example 2, and further, the two inner walls of the bite groove 13 are both inclined, and the inclination angle of the side wall of the pressing tooth 22 is the same as the inclination angle of the side wall of the bite groove 13;

[0055] When the water pressure causes the outer tube 2 to expand, the pressing teeth 22 and the engaging grooves 13 can engage tightly to prevent the outer tube 2 from further expanding, thereby improving the sealing between the inner wall of the outer tube 2 and the outer wall of the stainless steel tube 10 .

[0056] Example 4: Reference Figure 1 , Figure 2 , Figure 5 , a pipe joint connection assembly for a pipe network pipeline of a direct drinking water equipment, which is basically the same as Example 3, and further: a spiral groove 15 is opened on the inner wall of the pipe joint member 1 at one end of the water flow direction, and one end of the spiral groove 15 passes through one end of the pipe joint member 1; the inner diameter of the pipe joint member 1 is smaller than the inner diameter of the stainless steel pipe 10, and the pipe joint member 1 and the stainless steel pipes 10 at both ends of the pipe joint member 1 are divided into a pressurization zone 4, a smooth zone 5, a swirl zone 6, and a release zone 7 by the spiral groove 15, and the length of the swirl zone 6 is the same as the cross-sectional length of the spiral groove 15; the length of the pipe joint member 1 is L, the length of the smooth zone 5 is L1, and the length of the swirl zone 6 is L2,

[0057] L=L1+L2,

[0058] L2=(2 / 5)L;

[0059] by Figure 5Taking the perspective as an example, when water is about to enter the pipe joint 1 from the stainless steel pipe 10, the water pressure at the right end of the pipe joint 1 will increase due to the change in the smaller diameter. The increase in water pressure will increase the pressure between the right end of the pipe joint 1 and the stainless steel pipe 10, which will weaken the sealing of the right end of the pipe joint 1. The pressurized water will enter the vortex area 6, that is, the spiral groove 15, through the diversion of the flat area 5. The water flow will generate a vortex due to the shape of the spiral groove 15 and accelerate from the left end of the pipe joint 1 into the stainless steel pipe 10 located on the left side of the pipe joint 1. This increases the flow rate in the pipe joint 1 and further reduces the water pressure in the pressurization area 4.

[0060] Secondly, when the water in the swirl area 6 enters the release area 7, due to the large inner diameter of the release area 7, the water pressure passing through the pipe joint 1 is weakened in the release area 7, which is conducive to reducing the sealing effect of the left end of the pipe joint 1 affected by the water pressure. Secondly, the water in the release area 7 is in a swirl shape, which can take away the bubbles accumulated at the connection between the left end of the pipe joint 1 and the stainless steel pipe 10, avoiding the resistance of water flow caused by bubbles remaining at one end of the pipe joint 1, and avoiding the corrosion and accelerated aging of the connection between the pipe joint 1 and the stainless steel pipe 10 caused by bubbles;

[0061] The length of the swirl zone 6 is set to 2 / 5 of the length of the pipe joint 1 so that the swirl zone 6 does not occupy too much length of the pipe joint 1 and the flat zone 5 has a sufficient length for guiding the flow.

[0062] Example 5: Reference Figure 6 A pipe joint connection assembly for a pipe network of a direct drinking water equipment is basically the same as that of Example 4, and furthermore, the circumference of the leak detection seam 25 is C1, the circumference of the outer wall of the outer layer pipe 2 is C,

[0063] C1=1 / 10C, ​​which effectively controls the length of the leak detection seam 25 and avoids the leak detection seam 25 being torn due to excessive length under the action of water pressure.

[0064] The present invention improves the sealing effect of the stainless steel pipe 10 by setting a U-shaped sealing path, and can automatically feedback the sealing performance of the pipe joint 1 and the outer tube 2 according to the setting of the leak detection seam 25. Since the leak detection seam 25 is located in the middle of the U-shaped sealing path, when a leak is discovered, the other half of the U-shaped sealing path can continue to play a sealing role, thereby avoiding large-flow leakage when it is discovered. Secondly, during the leakage process, the leak detection seam 25 can also be automatically closed under the influence of water pressure to avoid long-term leakage.

[0065] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the present invention can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. A pipe joint connection assembly for a pipe network of a direct drinking water equipment, comprising a pipe joint member (1), characterized in that: Also includes: An outer tube (2) is sleeved on the tube joint (1), and the middle portion of the outer tube (2) is connected to the tube joint (1), so as to form two sealing cavities (20) with U-shaped cross sections between the tube joint (1) and the outer tube (2). Inserting the stainless steel pipe (10) into the sealing cavity (20) from both ends of the pipe joint (1) to form a U-shaped sealing path on one end of the stainless steel pipe (10); A corrugated area (23) is arranged at a middle portion of the outer layer tube (2) close to the pipe joint (1), and a water storage area (24) is formed between an inner wall of the corrugated area (23) and an outer wall of the pipe joint (1); A leak detection seam (25) is provided on the outer periphery of the corrugated area (23) near the middle of the pipe joint (1), the leak detection seam (25) is located on the top of the arc of the corrugated area (23), and the leak detection seam (25) is connected to the water storage area (24). When water penetrates into the water storage area (24), the water overflows from the leak detection seam (25), thereby indicating that the sealing performance of the pipe joint (1) and the outer layer pipe (2) is reduced; When the water pressure in the water storage area (24) increases, the corrugated area (23) deforms to squeeze the leak detection seam (25) to achieve closure; The outer circumference of both ends of the pipe joint (1) is provided with a first sealing groove (11), a sealing ring (12) is sleeved in the first sealing groove (11), and a pressure ring (21) is provided on the inner wall of the outer layer pipe (2), the pressure ring (21) corresponds to the first sealing groove (11); The outer circumferences of both ends of the pipe joint (1) are provided with bite grooves (13), and the inner wall of the outer layer pipe (2) is provided with pressing teeth (22), and the pressing teeth (22) correspond to the bite grooves (13).

2. A pipe joint connection assembly for a pipe network of a direct drinking water equipment according to claim 1, characterized in that: Both inner walls of the bite groove (13) are inclined, and the inclination angle of the side wall of the pressing tooth (22) is the same as the inclination angle of the side wall of the bite groove (13).

3. A pipe joint connection assembly for a pipe network of a direct drinking water equipment according to claim 1, characterized in that: Second sealing grooves (14) are provided on the outer circumference of both ends of the pipe joint (1), and the second sealing groove (14) is located on one side of the bite groove (13).

4. A pipe joint connection assembly for a pipe network of a direct drinking water equipment according to claim 1, characterized in that: The invention also comprises an end cover (3) which is symmetrically arranged, the end cover (3) comprising a first straight wall portion (31) and a second straight wall portion (32), the end cover (3) being threadedly connected to the outer periphery of one end of the pipe joint (1) via the first straight wall portion (31), and the second straight wall portion (32) on the end cover (3) being located between the inner wall of the outer layer pipe (2) and the outer wall of the pipe joint (1).

5. A pipe joint connection assembly for a pipe network of a direct drinking water equipment according to claim 4, characterized in that: A sealing gasket (33) is provided on the outer wall of the second straight wall portion (32), and the sealing gasket (33) is in contact with the outer wall of the stainless steel pipe (10).

6. A pipe joint connection assembly for a pipe network of a direct drinking water equipment according to claim 1, characterized in that: A spiral groove (15) is provided on the inner wall of the pipe joint (1) at one end in the water outflow direction, and one end of the spiral groove (15) passes through one end of the pipe joint (1); The inner diameter of the pipe joint (1) is smaller than the inner diameter of the stainless steel pipe (10). The spiral groove (15) divides the pipe joint (1) and the stainless steel pipes (10) at both ends of the pipe joint (1) into a pressurized area (4), a flat area (5), a swirl area (6), and a release area (7); the length of the swirl area (6) is the same as the cross-sectional length of the spiral groove (15).

7. A pipe joint connection assembly for a pipe network of a direct drinking water equipment according to claim 6, characterized in that: The length of the pipe joint (1) is L, the length of the flat zone (5) is L1, and the length of the swirl zone (6) is L2. L=L1+L2, L2=(2 / 5)L.

8. The pipe joint connection assembly for the pipe network of direct drinking water equipment according to claim 1, characterized in that: The circumference of the leak detection seam (25) is C1, and the circumference of the outer wall of the outer layer tube (2) is C. C1=1 / 10C.

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