Impulse type safety valve with high sealing performance

Abstract

The invention discloses a high-sealing-performance pulse type safety valve, and belongs to the technical field of pulse type safety valves, the high-sealing-performance pulse type safety valve comprises a valve body and a connecting pipe, and the outer side of the end of the connecting pipe is fixedly connected with a preassembled external connecting pipe; the connecting pipe and the preassembled external pipe are fixedly spliced through a connecting piece, and a sealing bag body and a second pressure adjusting bag body are embedded in the inner wall of the connecting pipe; through holes are evenly formed in the outer wall of a middle ring part of the connecting piece, first elastic rubber pieces are fixedly connected to the inner sides of the through holes, an alarm assembly used for detecting leakage is installed on the outer side of the connecting piece, a repairing piece is rotationally connected to the inner side of the connecting piece, and a pull rope is connected between the outer wall of the repairing piece and the first elastic rubber pieces. And a repairing glue solution is arranged on the inner side of the repairing part. The pulse type safety valve with the high sealing performance can be stably installed in a sealed mode, automatic leakage detection and alarm can be achieved, and secondary plugging and auxiliary leakage repairing can be conducted when leakage occurs.

Description

Technical Field

[0001] The invention relates to the technical field of safety valves, in particular to a pulse safety valve with high sealing performance. Background Art

[0002] The pulse safety valve is a device used to protect the safety of the pressure system. It is mainly composed of a main safety valve and a pulse valve. Its basic principle is to control the opening and closing of the main safety valve through the pulse valve. When the system pressure exceeds the set value, the pulse valve will act first, using the pulse signal (a small control pressure) to guide the main safety valve to open, thereby releasing the pressure in the system.

[0003] The prior art (application number: 202121348987.8, Chinese patent with application date of 2021-06-17) discloses an air safety valve state monitoring device, which includes a monitoring module, a rubber valve, a valve micro switch and a leakage micro switch. By arranging a monitoring module on the upper part of the exhaust flange of the safety valve, the rubber valve is hinged with the monitoring module, the rubber valve is fitted with the exhaust flange of the safety valve, the valve micro switch and the monitoring module are connected to the ear plate of the monitoring rubber valve, and the leakage micro switch is located in the rubber valve corresponding to the air leakage hole. When the safety valve leaks, the leakage micro switch is triggered to turn on the monitoring module to issue a leakage prompt. When the rotation angle of the ear plate reaches the set value, the valve micro switch is triggered to turn on the monitoring module to issue an alarm. The utility model overcomes the problems that the leakage of the original air safety valve is difficult to detect, the leakage detection efficiency is low, and there are safety hazards in the inspection. It has the characteristics of simple structure, facilitating real-time remote monitoring of the leakage of the air safety valve, safe and reliable, and simple and convenient operation. Although it can realize detection and alarm during use, it cannot perform secondary sealing and repair when leakage occurs at the connection, which makes it easy to use dangerous situations during the maintenance window period, and there are certain defects in use. Summary of the invention

[0004] The purpose of the present invention is to provide a pulse safety valve with high sealing performance to solve the problem raised in the above background technology that the pulse safety valves on the market are difficult to be stably sealed and cannot be alarmed and repaired in time when a connection leak occurs.

[0005] To achieve the above object, the present invention provides the following technical solution: a pulse safety valve with high sealing performance, comprising a valve body and a connecting pipe, wherein the outer side of the end of the connecting pipe is fixedly connected with a pre-installed external pipe; The connecting pipe and the pre-installed external pipe are fixedly spliced ​​by a connecting piece, and the inner wall of the connecting pipe is embedded with a sealing capsule and a second pressure regulating capsule, and the outer wall of the connecting pipe is evenly fixed with a first pressure regulating capsule, and part of the first pressure regulating capsule is embedded in the outer wall of the connecting pipe; The outer wall of the middle ring portion of the connecting piece is evenly provided with through holes, and a first elastic film is fixedly connected to the inner side of the through holes, and an alarm component for detecting leakage is installed on the outer side of the connecting piece, a repair piece is rotatably connected to the inner side of the connecting piece, and a pull rope is connected between the outer wall of the repair piece and the first elastic film, and a repair glue is arranged on the inner side of the repair piece.

[0006] Preferably, the outer diameter of the middle part of the connecting piece is larger than the outer diameter of its two ends, and the inner walls at both ends of the connecting piece are provided with internal thread structures, and the thread rotation directions of the internal thread structures at both ends of the connecting piece are opposite, the outer sides of the connecting pipe and the pre-installed external pipe are provided with external thread structures, and the two ends of the connecting piece are threadedly connected to the connecting pipe and the pre-installed external pipe, and a sealed connection is formed between the connecting piece, the connecting pipe and the pre-installed external pipe.

[0007] Preferably, during the rotation and adjustment process of the connecting member, the end portion thereof squeezes the first pressure regulating capsule, and when the connecting member cannot be screwed in, a portion of the first pressure regulating capsule is separated from the squeezing of the connecting member.

[0008] Preferably, the sealing sac and the first pressure-regulating sac are connected by a pipe, and after the sealing sac is pressurized, part of the gas inside it is transported to the first pressure-regulating sac through the pipe, and the first pressure-regulating sac is arranged in a circular ring structure, and at the same time, the connecting tube and the pre-installed external tube are connected at one end with a gap fit, and after the first pressure-regulating sac is expanded, it fits tightly between the inner wall of the connecting tube and the outer wall of the pre-installed external tube.

[0009] Preferably, the first pressure-regulating sac and the second pressure-regulating sac are connected by a pipeline, and the inner diameter of the second pressure-regulating sac gradually decreases from the middle to both ends, and the minimum inner diameter of the second pressure-regulating sac is smaller than the inner diameter of the connecting pipe. At the same time, the second pressure-regulating sac will transport its internal gas to the first pressure-regulating sac under the action of the medium delivery pressure.

[0010] Preferably, the first elastic film expands and bulges when the air pressure inside the connecting piece increases, and the alarm component includes a pressure sensor connected to the outside of the connecting piece, and the signal input end of the pressure sensor is attached to the first elastic film, and the first elastic film applies pressure to the pressure sensor during the expansion and bulging process, and at the same time, an alarm for leakage alarm is fixedly connected to the outside of the pressure sensor.

[0011] Preferably, a telescopic rod is fixedly connected to the outer side of the pressure sensor, and a guide cylinder is telescopically connected to the outer side of the telescopic rod, and the guide cylinder is fixedly installed on the outer side of the connecting piece, and a spring is connected between the telescopic rod and the guide cylinder.

[0012] Preferably, the side walls of the repair part are evenly provided with sliders, and the sliders are slidably connected to the annular grooves provided on the inner walls of the connecting part, and the pull rope connecting the repair part and the first elastic film is arranged in an inclined shape, and the repair part is rotated by pulling the pull rope during the expansion and bulging of the first elastic film, and a pressure plate is evenly and fixedly provided on the outside of the repair part, and the pressure plate will contact and squeeze the part of the first pressure regulating sac protruding from the outer wall of the connecting tube during the synchronous rotation.

[0013] Preferably, the side walls of the repair part are symmetrically fixedly provided with two second elastic films of annular structure, and a third elastic film is fixedly provided in a groove body opened on the annular inner wall of the repair part, and repair glue is stored between the repair part, the second elastic film and the third elastic film, and at the same time, injection holes are evenly opened on the third elastic film, and the third elastic film near the injection holes overlap each other to achieve the sealing of the injection holes, and the splicing seams of the injection holes, the connecting tube and the pre-installed external tube are correspondingly arranged, and at the same time, the second elastic film is subjected to pressure so that the repair glue on the inside of the repair part is squeezed toward the splicing seam position through the injection holes.

[0014] Compared with the prior art, the beneficial effects of the present invention are: the pulse safety valve with high sealing performance can be stably sealed and installed, can realize automatic leakage detection and alarm, and can perform secondary plugging and auxiliary repair of leakage when leakage occurs, the specific contents are as follows; 1. A first elastic film, a pressure sensor and an alarm are provided. When a connection leak occurs during the installation and use of the pulse pressure valve, the air pressure inside the connector will gradually increase, causing the first elastic film to expand and fix. At this time, the first elastic film will push the pressure sensor to perform elastic lifting and lowering adjustments. At this time, the force on the pressure sensor changes, and the occurrence of leakage is monitored, and a quick alarm is issued through the alarm to remind the staff to carry out timely maintenance and reduce losses.

[0015] 2. A connecting piece, a sealing sac, a first pressure-regulating sac and a second pressure-regulating sac are provided. The threaded sealing connection between the connecting piece, the connecting pipe and the pre-installed external pipe can ensure stable insertion of the connecting pipe and the pre-installed external pipe, and the first pressure-regulating sac is pressurized during the connection adjustment process of the connecting piece, thereby ensuring that the sealing sac is expanded to improve the installation sealing of the connecting pipe, and when the gas medium is transported, the second pressure-regulating sac is pressurized, thereby further transporting gas into the sealing sac, further improving the connection sealing.

[0016] 3. A first elastic film, a repair part and a pressure plate are provided. When a leak occurs at the connection, the air pressure inside the connection part will increase, causing the first elastic film to expand and bulge, and then the repair part is rotated by pulling the pull rope, so that the pressure plate outside the repair part can squeeze the first pressure-regulating sac, so that the first pressure-regulating sac continues to supply air to the sealing sac, thereby achieving secondary reinforced sealing of the connection by the sealing sac. At the same time, during the rotation of the repair part, the inner repair glue can be applied between the connecting tube and the pre-installed external tube to achieve auxiliary sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the installation structure of the connector of the present invention; Figure 3 This is a schematic diagram of the split structure of the connector of the present invention; Figure 4 It is a schematic diagram of the cross-sectional structure of the connecting pipe and the connecting piece of the present invention; Figure 5 For the present invention Figure 4 The enlarged structural diagram at A in the middle; Figure 6 This is a schematic diagram of the installation structure of the first pressure regulating sac and the second pressure regulating sac of the present invention; Figure 7 This is a schematic diagram of the installation structure of the alarm device of the present invention; Figure 8 It is a schematic diagram of the cross-sectional structure of the connecting piece of the present invention; Fig. 9 It is a schematic diagram of the three-dimensional structure of the repair part of the present invention.

[0018] In the figure: 1. valve body; 2. connecting pipe; 3. connecting part; 4. pre-installed external pipe; 5. sealing bladder; 6. first pressure regulating bladder; 7. second pressure regulating bladder; 8. first elastic film; 9. pressure sensor; 10. alarm; 11. telescopic rod; 12. guide cylinder; 13. spring; 14. repair part; 1401. slider; 1402. pressure plate; 1403. second elastic film; 1404. third elastic film; 1405. glue injection hole; 15. pull rope. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Example 1: Please refer to Figure 1-Figure 6 As shown, the existing pulse safety valve is not convenient to be stably sealed and connected with the external pipeline during use, which makes it easy for leakage to occur at the connection under the action of a large delivery pressure. In order to solve this technical problem, the present embodiment discloses the following technical contents; a pulse safety valve with high sealing performance, comprising a valve body 1 and a connecting pipe 2, and a pre-installed external pipe 4 is fixedly connected to the outer side of the end of the connecting pipe 2; the connecting pipe 2 and the pre-installed external pipe 4 are fixedly spliced ​​by a connecting piece 3, and a sealing capsule 5 and a second pressure regulating capsule 7 are embedded in the inner wall of the connecting pipe 2, and a first pressure regulating capsule 6 is evenly and fixedly installed on the outer wall of the connecting pipe 2, and part of the first pressure regulating capsule 6 is embedded in the outer wall of the connecting pipe 2.

[0021] The outer diameter of the middle part of the connecting piece 3 is larger than the outer diameter of its two ends, and the inner walls at both ends of the connecting piece 3 are provided with internal thread structures, and the thread rotation directions of the internal thread structures at both ends of the connecting piece 3 are opposite, the outer sides of the connecting pipe 2 and the pre-installed external pipe 4 are provided with external thread structures, and the two ends of the connecting piece 3 are threadedly connected to the connecting pipe 2 and the pre-installed external pipe 4, and a sealed connection is formed between the connecting piece 3 and the connecting pipe 2 and the pre-installed external pipe 4.

[0022] During the rotation adjustment process of the connecting member 3 , the end portion thereof squeezes the first pressure regulating capsule 6 , and when the connecting member 3 cannot be screwed in, a part of the first pressure regulating capsule 6 is separated from the squeezing of the connecting member 3 .

[0023] The sealing sac 5 and the first pressure-regulating sac 6 are connected by a pipeline, and after the sealing sac 5 is pressurized, part of the gas inside it is transported to the first pressure-regulating sac 6 through the pipeline, and the first pressure-regulating sac 6 is arranged in a circular ring structure, and at the same time, the connecting tube 2 and the pre-installed external tube 4 are connected at one end with a gap fit, and after the first pressure-regulating sac 6 is expanded, it fits tightly between the inner wall of the connecting tube 2 and the outer wall of the pre-installed external tube 4.

[0024] The first pressure-regulating sac 6 and the second pressure-regulating sac 7 are connected by a pipeline, and the inner diameter of the second pressure-regulating sac 7 gradually decreases from the middle to both ends, and the minimum inner diameter of the second pressure-regulating sac 7 is smaller than the inner diameter of the connecting tube 2. At the same time, the second pressure-regulating sac 7 will transport its internal gas to the first pressure-regulating sac 6 under the action of the medium delivery pressure.

[0025] By adopting the above technical scheme, the threaded end of the preinstalled external tube 4 is connected to the connector 3, and by rotating the connector 3, the two ends of the connector 3 can be threadedly connected to the connecting pipe 2 and the preinstalled external tube 4, thereby driving the connecting pipe 2 and the preinstalled external tube 4 to be plugged and connected, and as the connector 3 is screwed in, it will squeeze the first pressure regulating capsule 6, so that part of the gas in the first pressure regulating capsule 6 is transported to the sealing capsule 5, and the sealing capsule 5 will expand and clamp on the outer wall of the preinstalled external tube 4 at this time, so as to achieve effective sealing of the connection between the connecting pipe 2 and the preinstalled external tube 4, and when the valve body 1 is conveying gas medium, the second pressure regulating capsule 7 will shrink under the pressure of the conveying medium, so as to further convey gas to the sealing capsule 5, thereby improving the connection sealing during medium conveying, and the threaded connection structure of the connector 3 can achieve secondary sealing of the connection between the connecting pipe 2 and the preinstalled external tube 4.

[0026] Embodiment 2: The technical content disclosed in this embodiment is a further improvement based on the above embodiment 1. The existing pulse safety valve is inconvenient to perform leakage detection and automatic secondary plugging when in use. In order to further solve this technical problem, this embodiment discloses the following technical content, such as Figure 4-Figure 9 As shown; the outer wall of the middle ring portion of the connecting member 3 is evenly provided with through holes, and the inner side of the through holes is fixedly connected to the first elastic film 8, and the outer side of the connecting member 3 is installed with an alarm component for detecting leakage, the inner side of the connecting member 3 is rotatably connected with a repairing member 14, and a pull rope 15 is connected between the outer wall of the repairing member 14 and the first elastic film 8, and the inner side of the repairing member 14 is provided with a repair glue.

[0027] The first elastic film 8 expands and bulges when the air pressure inside the connecting piece 3 increases, and the alarm component includes a pressure sensor 9 connected to the outside of the connecting piece 3, and the signal input end of the pressure sensor 9 is attached to the first elastic film 8, and the first elastic film 8 applies pressure to the pressure sensor 9 during the expansion and bulging process. At the same time, an alarm 10 for leakage alarm is fixedly connected to the outside of the pressure sensor 9.

[0028] A telescopic rod 11 is fixedly connected to the outside of the pressure sensor 9 , and a guide cylinder 12 is telescopically connected to the outside of the telescopic rod 11 , and the guide cylinder 12 is fixedly installed on the outside of the connecting member 3 , and a spring 13 is connected between the telescopic rod 11 and the guide cylinder 12 .

[0029] The side walls of the repair part 14 are evenly provided with sliders 1401, and the sliders 1401 are slidably connected to the annular grooves opened on the inner wall of the connecting part 3, and the pull rope 15 connecting the repair part 14 and the first elastic film 8 is arranged in an inclined shape. At the same time, the repair part 14 is rotated by pulling the pull rope 15 during the expansion and swelling of the first elastic film 8. At the same time, the outer side of the repair part 14 is evenly fixed with pressure plates 1402, and the pressure plates 1402 will contact and squeeze the part of the first pressure regulating bag 6 protruding from the outer wall of the connecting tube 2 during the synchronous rotation.

[0030] The side wall of the repair part 14 is symmetrically fixedly provided with two annular second elastic films 1403, and a third elastic film 1404 is fixedly provided in a groove body opened on the annular inner wall of the repair part 14, and repair glue is stored between the repair part 14, the second elastic film 1403 and the third elastic film 1404, and at the same time, injection holes 1405 are evenly opened on the third elastic film 1404, and the third elastic films 1404 near the injection holes 1405 overlap with each other to achieve the sealing of the injection holes 1405, and the splicing seam positions of the injection holes 1405 and the connecting tube 2 and the pre-installed external tube 4 are correspondingly arranged, and at the same time, the second elastic film 1403 is subjected to pressure so that the repair glue on the inner side of the repair part 14 is squeezed to the splicing seam position through the injection holes 1405.

[0031] By adopting the above technical solution, when a leak occurs at the connection, the gas medium will enter the inner side of the connecting piece 3, causing the air pressure inside the connecting piece 3 to increase. At this time, the first elastic film 8 will expand and bulge, so that the first elastic film 8 will resist and push the pressure sensor 9 during the swelling process. The pressure sensor 9 can detect whether there is a leak through the pressure change, and sound an alarm through the alarm 10 to remind the staff to carry out timely maintenance. As the first elastic film 8 expands, it will pull the repair part 14 to rotate through the pull rope 15. At this time, the pressure plate 1402 on the outside of the repair part 14 will squeeze the first pressure regulating capsule 6, so that the first pressure regulating capsule 6 will again supply air to the sealing capsule 5, thereby achieving the increase of the sealing capsule 5 again, so as to improve the sealing strength and achieve the purpose of plugging the leak. During the rotation of the repair part 14, the second elastic film 1403 on its side wall will be pressurized, so that the repair glue on the inside of the repair part 14 is squeezed out through the glue injection hole 1405 and coated on the connecting seam between the connecting pipe 2 and the pre-installed external pipe 4, so as to achieve temporary remedy for the leakage.

[0032] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0033] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pulse safety valve with high sealing performance, comprising a valve body (1) and a connecting pipe (2), wherein the outer side of the end of the connecting pipe (2) is fixedly connected to a pre-installed external pipe (4); It is characterized in that The connecting tube (2) and the pre-installed external tube (4) are fixedly spliced ​​together via a connecting piece (3), and a sealing capsule (5) and a second pressure regulating capsule (7) are embedded and installed on the inner wall of the connecting tube (2), and a first pressure regulating capsule (6) is evenly and fixedly installed on the outer wall of the connecting tube (2), and a portion of the first pressure regulating capsule (6) is embedded in the outer wall of the connecting tube (2); The outer wall of the middle ring portion of the connecting member (3) is evenly provided with through holes, and the inner side of the through holes is fixedly connected to a first elastic film (8), and an alarm component for detecting leakage is installed on the outer side of the connecting member (3), a repair member (14) is rotatably connected to the inner side of the connecting member (3), a drawstring (15) is connected between the outer wall of the repair member (14) and the first elastic film (8), and a repair glue is provided on the inner side of the repair member (14).

2. A pulse safety valve with high sealing performance according to claim 1, characterized in that: The outer diameter of the middle part of the connecting piece (3) is larger than the outer diameters of the two ends thereof, and the inner walls of the two ends of the connecting piece (3) are both provided with internal thread structures, and the thread rotation directions of the internal thread structures at the two ends of the connecting piece (3) are opposite, the outer sides of the connecting pipe (2) and the pre-installed external pipe (4) are both provided with external thread structures, and the two ends of the connecting piece (3) are threadedly connected to the connecting pipe (2) and the pre-installed external pipe (4), and the connecting piece (3) and the connecting pipe (2) and the pre-installed external pipe (4) form a sealed connection.

3. A pulse safety valve with high sealing performance according to claim 1, characterized in that: During the rotation adjustment process of the connecting member (3), the end portion thereof squeezes the first pressure regulating capsule (6), and when the connecting member (3) cannot be screwed in, a portion of the first pressure regulating capsule (6) is separated from the squeezing of the connecting member (3).

4. A pulse safety valve with high sealing performance according to claim 1, characterized in that: The sealing sac (5) and the first pressure regulating sac (6) are connected via a pipeline, and after the sealing sac (5) is pressurized, part of the gas inside it is transported to the first pressure regulating sac (6) via the pipeline, and the first pressure regulating sac (6) is arranged in a circular ring structure, and the connecting pipe (2) and the pre-installed external pipe (4) are connected at one end with a gap fit, and after the first pressure regulating sac (6) is expanded, it is tightly fitted between the inner wall of the connecting pipe (2) and the outer wall of the pre-installed external pipe (4).

5. A pulse safety valve with high sealing performance according to claim 1, characterized in that: The first pressure regulating sac (6) and the second pressure regulating sac (7) are connected via a pipeline, and the inner diameter of the second pressure regulating sac (7) gradually decreases from the middle to both ends, and the minimum inner diameter of the second pressure regulating sac (7) is smaller than the inner diameter of the connecting pipe (2). At the same time, the second pressure regulating sac (7) will transport its internal gas to the first pressure regulating sac (6) under the action of the medium transport pressure.

6. A pulse safety valve with high sealing performance according to claim 1, characterized in that: The first elastic film (8) expands and bulges when the air pressure inside the connecting piece (3) increases, and the alarm component comprises a pressure sensor (9) connected to the outside of the connecting piece (3), and the signal input end of the pressure sensor (9) is attached to the first elastic film (8), and the first elastic film (8) applies pressure to the pressure sensor (9) during the process of expansion and swelling, and an alarm (10) for alarming leakage is also fixedly connected to the outside of the pressure sensor (9).

7. A pulse safety valve with high sealing performance according to claim 6, characterized in that: The outer side of the pressure sensor (9) is fixedly connected to a telescopic rod (11), and the outer side of the telescopic rod (11) is telescopically connected to a guide cylinder (12), and the guide cylinder (12) is fixedly mounted on the outer side of the connecting member (3), and a spring (13) is connected between the telescopic rod (11) and the guide cylinder (12).

8. The pulse safety valve with high sealing performance according to claim 1, characterized in that: The side wall of the repairing member (14) is evenly provided with sliders (1401), and the sliders (1401) are slidably connected to the annular sliding grooves provided on the inner wall of the connecting member (3), and the pull rope (15) connecting the repairing member (14) and the first elastic film (8) is arranged in an inclined shape, and the pull rope (15) is used to pull the repairing member (14) to rotate during the expansion and swelling of the first elastic film (8), and a pressure plate (1402) is evenly fixedly provided on the outer side of the repairing member (14), and during the synchronous rotation process, the pressure plate (1402) contacts and squeezes the portion of the first pressure regulating sac (6) protruding from the outer wall of the connecting tube (2).

9. A pulse safety valve with high sealing performance according to claim 1, characterized in that: Two annular second elastic films (1403) are symmetrically fixedly mounted on the side wall of the repair piece (14), and a third elastic film (1404) is fixedly mounted in a groove body provided on the annular inner wall of the repair piece (14), and repair glue is stored between the repair piece (14), the second elastic film (1403) and the third elastic film (1404), and glue injection holes (1405) are evenly provided on the third elastic film (1404), and the third elastic films (1404) near the glue injection holes (1405) overlap each other to achieve sealing of the glue injection holes (1405), and the splicing seams of the glue injection holes (1405) and the connecting tube (2) and the pre-installed external tube (4) are arranged correspondingly, and the second elastic film (1403) is subjected to pressure so that the repair glue on the inner side of the repair piece (14) is squeezed toward the splicing seam position through the glue injection holes (1405).

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