Sealing and leak-proof pipe fitting for heat exchanger

Abstract

The present invention provides a sealing and leakproof pipe fitting for a heat exchanger, comprising a pipe shell, a top shell, four groups of first pipe fittings and four groups of second pipe fittings, a flange is connected between the first pipe fitting and the second pipe fitting, a ring sleeve is slidably connected to the outer wall of the flange, the flange comprises a first flange and a second flange, a shielding ring is slidably connected between the inner holes of the first flange and the second flange; a first seal is arranged between the first flange and the second flange, two groups of through holes are arranged on the outer wall of the ring sleeve, a second seal is arranged in the through holes, and a third seal is arranged between the ring sleeve and the first flange and between the ring sleeve and the second flange. A negative pressure area is formed between the first flange, the second flange, the ring sleeve, and the first seal by a negative pressure structure, and when the first seal is aged and shrunk to cause leakage, the microcontroller controls the locking structure to drive the second flange to move toward the first flange to squeeze the first seal to restore its sealing function again, which can effectively solve the problem of leakage at the pipe fitting connection.

Description

Technical Field

[0001] The invention relates to the technical field of parts for general heat exchange or heat transfer equipment, in particular to a sealing and leak-proof pipe fitting for a heat exchanger. Background Art

[0002] As the name implies, a heat exchanger is a device used for heat exchange. Its working principle is based on the basic law of heat transfer, that is, heat will spontaneously flow from a high-temperature object to a low-temperature object until the two reach thermal equilibrium. There are many different types of heat exchangers, including shell and tube, plate, tube bundle, spiral plate, and air cooler. Each type of heat exchanger has its unique application scenarios and advantages. For example, shell and tube heat exchangers are widely used in evaporation, condensation, vaporization, heating and other processes in the chemical and metallurgical industries; and plate heat exchangers are widely used in air conditioning, refrigeration, chemical industry, food processing and other fields due to their high heat exchange efficiency, compactness, and easy cleaning. In the production of oleic acid, shell and tube heat exchangers are generally used.

[0003] The heat exchanger in the prior art can realize the heat exchange of fluids, but there are still some problems in practical application. For example, there is a risk of fluid leakage at the pipe connection of the heat exchanger during use, and this situation has not been effectively controlled. In order to solve the above problems, there is a public technology that proposes a heat exchanger based on sealed and leak-proof pipes and a heat exchange method for oleic acid production, which belongs to the technical field of parts for general heat exchange or heat transfer equipment. A top shell is provided on the top of the heat exchange tube shell, and a cold flow inlet pipe and a cold flow outlet pipe are fixedly installed on the outer surfaces of both sides of the top shell, and a hot flow inlet pipe and a hot flow outlet pipe are fixedly installed on the outer surfaces of both sides of the heat exchange tube shell, respectively. The hot flow inlet pipe is located above the hot flow outlet pipe, and one end of the hot flow inlet pipe and the hot flow outlet pipe is provided with a pipe ring, and a bottom shell is fixedly installed on the bottom of the heat exchange tube shell, and a support base is fixedly installed on the bottom surface of the bottom shell. The disclosed technology states that if some unexpected leakage occurs, the central liquid absorption ring will produce secondary leakage protection. The central liquid absorption ring can absorb a small amount of leaked liquid, and the humidity sensor can monitor the adsorption amount. When the monitored amount reaches the maximum value, the control motor can be controlled to start, and the control motor can drive the double-threaded shaft to rotate. The double-threaded shaft can drive the two threaded moving blocks to approach each other. At this time, the two liquid squeezing rings are close to each other, which squeezes the central liquid absorption ring. The squeezed central liquid absorption ring can return the internally adsorbed liquid to the pipe body through the return pipe and enter the heat exchanger.

[0004] However, there are obvious drawbacks in the above-mentioned public technology. First, its single-sided motor drives two groups of squeezing rings to approach each other. When the squeezing rings are not under force, the two groups of squeezing rings can be kept parallel. Once under force, the driving force of the motor cannot reach the side of the two groups of squeezing rings away from the motor. If the motor continues to rotate, either the squeezing rings will be deformed or the shaft of the motor will be bent and damaged. Moreover, its squeezing action cannot deal with the location of the leakage, which is a temporary solution. In addition, when the squeezing ring squeezes the liquid suction ring, the liquid will also leak out from the inner and outer walls of the squeezing ring, and the purpose of being returned by the return pipe after squeezing cannot be achieved.

[0005] In summary, in order to solve the problem of fluid leakage risk at the pipe joints of the heat exchanger during use, it is necessary to develop a sealed and leak-proof pipe for the heat exchanger. Summary of the invention

[0006] In view of the deficiencies of the prior art, the present invention provides a sealed and leak-proof pipe fitting for a heat exchanger, which solves the problem that the pipe fittings for heat exchangers in the prior art have the risk of fluid leakage at the pipe fitting joints during use.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A sealing and leak-proof pipe fitting for a heat exchanger, comprising a tube shell, a top shell, four groups of first pipe fittings and four groups of second pipe fittings; the top shell is arranged at the top of the tube shell, the four groups of first pipe fittings are arranged in groups of two on both sides of the tube shell and on both sides of the top shell, and the four groups of second pipe fittings are arranged at one end of the four groups of first pipe fittings away from the tube shell and the top shell; flanges are fixedly connected between opposite ends of the first pipe fittings and the second pipe fittings, outer walls of the two groups of flanges are slidably connected with ring sleeves, the outer walls of the ring sleeves are fixedly connected with a mounting shell, and the inner side of the mounting shell is fixedly connected with a microcontroller;

[0009] The flange plate includes a first flange and a second flange, the first flange is connected to the first pipe fitting, and the second flange is connected to the second pipe fitting; a blocking ring is slidably connected between the inner holes of the first flange and the second flange; a first sealing member is provided between the first flange and the second flange, and the first sealing member is located at the periphery of the blocking ring;

[0010] The outer wall of the ring sleeve is provided with two groups of through holes, and the two groups of through holes are connected to the first flange and the second flange on the opposite side of the through holes on the sides facing the axis of the ring sleeve, and the inner walls of the two groups of through holes are provided with multiple groups of second sealing members;

[0011] A third seal is provided between the ring sleeve and the first flange and between the ring sleeve and the second flange; two sets of the third seal are respectively slidably connected with the first flange and the second flange;

[0012] A negative pressure structure and a detection structure are provided on the outer wall of the ring sleeve and inside the mounting shell; the negative pressure structure and the detection structure are respectively installed on one of the two groups of through holes, the negative pressure structure is used to suck the first flange and the second flange into a vacuum, and the detection structure is used to detect the vacuum degree between the first flange and the second flange;

[0013] A locking structure is provided between the ring sleeve and the first pipe member or the second pipe member, and the locking structure is used to drive the first flange and the second flange to fit each other to squeeze the first sealing member;

[0014] The negative pressure structure, the detection structure and the locking structure are electrically connected to the microcontroller respectively;

[0015] A negative pressure area is formed between the first flange, the second flange and the inner wall of the ring sleeve through the first seal, the second seal and the third seal. When the first seal ages and shrinks to cause leakage, the detection structure detects that the negative pressure state of the negative pressure area has changed, and the microcontroller controls the locking structure to drive the first flange and the second flange to approach each other, so as to squeeze the first seal and restore the sealing function of the first seal again.

[0016] Preferably, first grooves are provided on the opposite sides of the first flange and the second flange and close to the axis, and the shielding ring is slidably connected between the two groups of the first grooves;

[0017] A third groove is arranged between the first flange and the second flange on one side opposite to the other, and the first sealing member is arranged between two groups of the third grooves;

[0018] The inner side wall of the ring sleeve is axially distributed and sequentially provided with two groups of second grooves, and the third sealing member is disposed in both groups of the second grooves.

[0019] Preferably, the ring sleeve is provided with a limiting structure for limiting the axial relative position of the ring sleeve and the first flange and the second flange;

[0020] The limiting structure includes two groups of limiting screws, both of which are threadedly connected to the outer wall of the ring sleeve, and one end of the two groups of limiting screws facing the axis of the ring sleeve penetrates the ring sleeve and extends into the interior of the ring sleeve, the first flange and the second flange are located between the ends of the two groups of limiting screws extending into the interior of the ring sleeve, and the axial movement range between the ring sleeve and the first flange and the second flange is limited by the two groups of limiting screws.

[0021] Preferably, the negative pressure structure is a micro vacuum pump, and the inlet end of the micro vacuum pump is connected to the through hole through an air suction pipe.

[0022] Preferably, the detection structure is a vacuum sensor, and the detection end of the vacuum sensor is installed in the corresponding through hole and sealed by multiple groups of the second sealing members.

[0023] Preferably, the locking structure includes two groups of pen-type electric telescopic rods, and the extension shafts of the two groups of pen-type electric telescopic rods both pass through the first flange and are fixedly connected to the second flange.

[0024] Preferably, a guide structure is provided between the first flange and the second flange for guiding the locking structure when it is in motion;

[0025] The guide structure includes two groups of guide columns and two groups of guide holes. The two groups of guide holes are arranged in a through shape on the inner wall of the second flange and are respectively located on both sides of the second pipe fitting. The two groups of guide columns are fixedly connected to the side of the first flange facing the second flange and are axially opposite to the two groups of guide holes. The two groups of guide columns are respectively slidably connected to the inner side wall of one group of guide holes.

[0026] Preferably, an alarm structure for alarming is provided on the outer wall of the mounting shell; the alarm structure includes a buzzer and an alarm light, the buzzer and the alarm light are fixedly connected to the outer wall of the mounting shell in sequence, and the buzzer and the alarm light are electrically connected to the microcontroller.

[0027] Preferably, ventilation windows are provided on two opposite side walls of the installation shell.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] In the initial state, the first flange and the second flange are not completely close to each other, and the connection is preliminarily shielded by the blocking ring to prevent a large amount of liquid from contacting the first seal. The connection is sealed by the first seal between the first flange and the second flange. When the first seal ages and shrinks, causing leakage, the negative pressure state of the negative pressure area will inevitably change, which can be detected by the detection structure. The microcontroller controls the locking structure to drive the second flange to move a certain distance toward the first flange to squeeze the first seal to restore its sealing function, which can effectively solve the problem of leakage at the pipe connection during long-term use.

[0030] When the first flange and the second flange come close to each other before they are fully fitted together, the microcontroller controls the buzzer and the alarm light to sound an alarm, reminding the staff to replace the first seal in time. After replacing the first seal, the first flange and the second flange return to their initial positions, which effectively improves the safety of use and plays a good preventive role in advance. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the structure of the present invention;

[0032] Figure 2 For the present invention Figure 1 A partial enlarged view of the middle A;

[0033] Figure 3 It is a partial cross-sectional view of the first pipe fitting, the second pipe fitting, the first flange, the second flange, the ring sleeve and the internal structure of the mounting shell of the present invention;

[0034] Figure 4 For the present invention Figure 3 A partial enlarged view of point B in the middle;

[0035] Figure 5 It is a partial side cross-sectional view of the first pipe fitting, the second pipe fitting, the first flange, the second flange and the sleeve connection structure of the present invention;

[0036] Figure 6 It is a partial sectional view of the inner structure of the ring sleeve of the present invention;

[0037] Figure 7 It is a partial side cross-sectional view of the connection structure of the first pipe fitting and the first flange of the present invention.

[0038] Among them, 1. tube shell; 2. top shell; 3. first tube fitting; 4. second tube fitting; 5. ring sleeve; 6. mounting shell; 7. ventilation window; 8. buzzer; 9. alarm light; 10. flange; 11. first groove; 12. shielding ring; 13. first sealing member; 14. pen-type electric telescopic rod; 15. microcontroller; 16. miniature vacuum pump; 1601, suction pipe; 17. vacuum sensor; 18. through hole; 19. second sealing member; 20. third sealing member; 21. guide hole; 22. guide column; 23. limit screw; 24. second groove; 25. third groove. DETAILED DESCRIPTION

[0039] 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.

[0040] like Figures 1 to 7 As shown, the embodiment of the present invention provides a sealing and leakproof pipe fitting for a heat exchanger, comprising a tube shell 1, a top shell 2, four groups of first pipe fittings 3 and four groups of second pipe fittings 4. The top shell 2 is arranged at the top of the tube shell 1. The four groups of first pipe fittings 3 are arranged in groups of two at the front and rear sides of the tube shell 1 and the front and rear sides of the top shell 2, respectively. The four groups of second pipe fittings 4 are respectively arranged at one end of the four groups of first pipe fittings 3 away from the tube shell 1 and the top shell 2. A flange 10 is fixedly connected between the opposite ends of the first pipe fittings 3 and the second pipe fittings 4. The outer walls of the two groups of flanges 10 are slidably connected with a ring sleeve 5. The outer wall of the ring sleeve 5 is fixedly connected with a mounting shell 6. The front and rear side walls of the mounting shell 6 are both provided with ventilation windows 7. The inner upper wall of the mounting shell 6 is fixedly connected with a microcontroller 15. The microcontroller 15 is a mature technology on the market, and is mainly used to receive the signal collected by the vacuum sensor 17, and control the pen-type electric telescopic rod 14, the micro vacuum pump 16, the buzzer 8 and the alarm light 9 according to the signal.

[0041] In order to prevent a large amount of liquid from directly contacting the first seal 13 and causing premature failure, the two sets of flanges 10 are respectively the first flange and the second flange, the first flange is connected to the first pipe 3, and the second flange is connected to the second pipe 4. The first flange and the second flange are both provided with first grooves 11 on the opposite side and close to the axis, and the two sets of first grooves 11 are slidably connected with a shielding ring 12. The shielding ring 12 can play a certain shielding role to prevent the liquid from directly impacting the first seal 13.

[0042] In order to achieve sealing between the first pipe fitting 3 and the second pipe fitting 4, a third groove 25 is further provided between the first flange and the second flange on the opposite side and at the periphery of the first groove 11, and a first seal 13 is provided between the two groups of third grooves 25. The first seal 13 enables the first pipe fitting 3 and the second pipe fitting 4 to be sealed. The first seal 13 is an elastic seal. When it is not sealed due to aging and shrinkage, the first seal 13 is squeezed by reducing the distance between the first flange and the second flange. After squeezing, the first seal 13 can continue to provide sealing, effectively solving the leakage problem.

[0043] In order to maintain the seal between the ring sleeve 5 and the two groups of flanges 10, the inner wall of the ring sleeve 5 is sequentially provided with two groups of second grooves 24 in axial distribution, and the inner walls of the two groups of second grooves 24 are both provided with third seals 20, and the inner walls of the two groups of third seals 20 are respectively slidably connected with the outer wall of the first flange circumference and the outer wall of the second flange circumference. The ring sleeve 5 is sealed with the first flange and the second flange by the two groups of third seals 20, and a negative pressure area can be formed between the ring sleeve 5 and the first seal 13 and between the two groups of third seals 20.

[0044] In order to keep the first flange and the second flange relatively movable and the ring sleeve 5 will not be separated from the first flange and the second flange, a limiting structure for limiting the relative axial position of the ring sleeve 5 and the first flange and the second flange is provided on the inner wall of the ring sleeve 5. The limiting structure includes two sets of limiting screws 23, both of which are threadedly connected to the outer wall of the ring sleeve 5, and one end of the two sets of limiting screws 23 facing the axis of the ring sleeve 5 penetrates the right wall of the ring sleeve 5 and extends into the inside of the ring sleeve 5. The first flange and the second flange are located between the ends of the two sets of limiting screws 23 extending into the inside of the ring sleeve 5, and the axial movement range between the ring sleeve 5 and the first flange and the second flange is limited by the two sets of limiting screws 23. The ring sleeve 5 limits the axial position by the two sets of limiting screws 23 to prevent it from slipping off the outer wall of the first flange and the second flange. At the same time, the movement of the first flange and the second flange approaching each other is not constrained.

[0045] In order to form a negative pressure state in the negative pressure area, two groups of through holes 18 are provided on the outer wall of the ring sleeve 5. The two groups of through holes 18 are connected to the first flange and the second flange on the side facing the axis of the ring sleeve 5. The inner walls of the two groups of through holes 18 are provided with multiple groups of second sealing members 19. The outer wall of the ring sleeve 5 and the inside of the mounting shell 6 are provided with a negative pressure structure for sucking the first flange and the second flange into a vacuum. The negative pressure structure is a micro vacuum pump 16, which is fixedly connected to the outer wall of the ring sleeve 5 and is located inside the mounting shell 6. The inlet end of the micro vacuum pump 16 is connected to one of the two groups of through holes 18 through an air suction pipe 1601, and the air suction pipe 1601 is sealed with the corresponding through hole 18 by multiple groups of second sealing members 19. The micro vacuum pump 16 is electrically connected to the microcontroller 15. The air in the negative pressure area can be sucked away by the micro vacuum pump 16, so that the negative pressure area forms a vacuum state. When the first seal 13 ages and shrinks after long-term use, the pressure of the liquid transmitted inside the first tube 3 and the second tube 4 leaks into the negative pressure area from the connection between the first seal 13 and the third groove 25, causing the negative pressure area to no longer maintain a vacuum state. Whether the sealing state of the first seal 13 has changed is determined based on the change in this state.

[0046] In order to detect the vacuum degree of the negative pressure area, a detection structure for detecting the vacuum degree between the first flange and the second flange is also provided on the outer wall of the ring sleeve 5 and inside the mounting shell 6. The detection structure is a vacuum sensor 17, which is fixedly connected to the outer wall of the ring sleeve 5 and located on one side of the negative pressure structure. The detection end of the vacuum sensor 17 is fixedly connected to the inner wall of a group of through holes 18 that is not connected to the negative pressure structure in the two groups of through holes 18. The detection end of the vacuum sensor 17 is sealed with the corresponding inner wall of the through hole 18 through multiple groups of second sealing members 19. The vacuum sensor 17 is electrically connected to the microcontroller 15. The vacuum sensor 17 can detect the vacuum condition of the negative pressure area so that the microcontroller 15 can make corresponding strategies according to the signals collected by the vacuum sensor 17.

[0047] In order to achieve the action of the first flange and the second flange approaching each other, a locking structure is provided between the ring sleeve 5 and the first pipe 3 or the second pipe 4 for driving the first flange and the second flange to fit each other to squeeze the first seal 13 to increase the sealing effect. The locking structure includes two sets of pen-type electric telescopic rods 14, both of which are fixedly connected to the side of the first flange away from the second flange and are respectively located on both sides of the first pipe 3, and the extension shafts of the two sets of pen-type electric telescopic rods 14 pass through the inner wall of the first flange and are fixedly connected to the second flange, and the two sets of pen-type electric telescopic rods 14 are electrically connected to the microcontroller 15. The first seal 13 is a common elastic seal on the market. When it shrinks due to aging, the distance between the first flange and the second flange is appropriately reduced, so that the first seal 13 can refill the third groove 25 to obtain a sealed state again, and the distance between the first flange and the second flange can be reduced by partially retracting the extension shaft of the pen-type electric telescopic rod 14.

[0048] In order to keep the first flange and the second flange parallel to each other when they are close to each other, a guide structure for guiding when the locking structure is in motion is also provided between the first flange and the second flange. The guide structure includes two groups of guide posts 22 and two groups of guide holes 21. The two groups of guide holes 21 are arranged on the inner wall of the second flange in a front-to-back through-shape and are respectively located on both sides of the second pipe 4. The two groups of guide posts 22 are fixedly connected to the side of the first flange facing the second flange and are axially opposite to the two groups of guide holes 21 respectively. The two groups of guide posts 22 are respectively slidably connected to the inner side wall of one group of guide holes 21. Through the cooperation of the two groups of guide posts 22 and the guide holes 21, the first flange and the second flange will not deflect radially when they are close to each other, thereby protecting the extension axis of the pen-type electric telescopic rod 14 from being bent, and effectively improving the service life.

[0049] In order to notify the staff to perform maintenance before the first flange and the second flange are about to completely abut, an alarm structure for alarming is provided on the outer wall of the mounting shell 6. The alarm structure includes a buzzer 8 and an alarm light 9, which are fixedly connected to the outer wall of the mounting shell 6 in sequence, and the buzzer 8 and the alarm light 9 are electrically connected to the microcontroller 15. Before the first flange and the second flange are about to completely abut, that is, when the sealing state cannot be regained by reducing the distance between the first flange and the second flange next time, the alarm is controlled by the microcontroller 15, the alarm sound is emitted by the buzzer 8, and the warning light is emitted by the alarm light 9, to remind the staff to replace the first sealing member 13 in time.

[0050] Working principle: The shielding ring 12 can play a certain shielding role to prevent the liquid from directly impacting the first seal 13; the first seal 13 is an elastic seal. When it is not sealed due to aging and shrinkage, the first seal 13 is squeezed by reducing the distance between the first flange and the second flange. After squeezing, the first seal 13 can continue to provide sealing effect, effectively solving the leakage problem; the ring sleeve 5 is sealed with the first flange and the second flange by two groups of third seals 20, and a negative pressure area can be formed between the ring sleeve 5 and the first seal 13 and between the two groups of third seals 20; the ring sleeve 5 is sealed with two groups of third seals 20. The screw 23 limits the axial position to prevent it from slipping off the outer wall of the first flange and the second flange. At the same time, the movement of the first flange and the second flange approaching each other is not constrained; the micro vacuum pump 16 is electrically connected to the microcontroller 15, and the air in the negative pressure area can be sucked away by the micro vacuum pump 16, so that the negative pressure area forms a vacuum state. When the first seal 13 ages and shrinks after long-term use, the pressure of the liquid transmitted inside the first pipe 3 and the second pipe 4 is leaked into the negative pressure area from the connection between the first seal 13 and the third groove 25, causing the negative pressure area to no longer maintain a vacuum state. From the change of this state, Determine whether the sealing state of the first sealing member 13 has changed; the vacuum sensor 17 is electrically connected to the microcontroller 15, and the vacuum sensor 17 can detect the vacuum condition of the negative pressure area, so that the microcontroller 15 can make a corresponding strategy according to the signal collected by the vacuum sensor 17; the first sealing member 13 is a common elastic sealing member on the market. When it shrinks due to aging, the distance between the first flange and the second flange is appropriately reduced, so that the first sealing member 13 can refill the third groove 25 to obtain a sealing state again, and the first flange and the second flange can be partially retracted by the extension shaft of the pen-type electric telescopic rod 14. The action of reducing the distance between the first flange and the second flange; through the cooperation of the two sets of guide columns 22 and the guide holes 21, the first flange and the second flange will not deflect radially when they approach each other, protecting the extended axis of the pen-type electric telescopic rod 14 from being bent, and effectively improving the service life; before the first flange and the second flange are about to completely abut, that is, when the sealing state can no longer be regained by reducing the distance between the first flange and the second flange next time, the alarm is controlled by the microcontroller 15, the alarm sound is emitted by the buzzer 8, and the warning light is emitted by the alarm light 9, reminding the staff to replace the first seal 13 in time.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sealing and leak-proof pipe fitting for a heat exchanger, characterized in that: The device comprises a tube shell (1), a top shell (2), four groups of first tube fittings (3) and four groups of second tube fittings (4); the top shell (2) is arranged at the top of the tube shell (1); the four groups of first tube fittings (3) are arranged in groups of two on both sides of the tube shell (1) and on both sides of the top shell (2); the four groups of second tube fittings (4) are arranged at one end of the four groups of first tube fittings (3) away from the tube shell (1) and the top shell (2); flanges (10) are fixedly connected between opposite ends of the first tube fittings (3) and the second tube fittings (4); outer walls of the two groups of flanges (10) are slidably connected with ring sleeves (5); an installation shell (6) is fixedly connected to the outer wall of the ring sleeve (5); and a microcontroller (15) is fixedly connected to the inner side of the installation shell (6); The flange plate (10) comprises a first flange and a second flange, the first flange being connected to the first pipe fitting (3), and the second flange being connected to the second pipe fitting (4); a blocking ring (12) is slidably connected between the inner holes of the first flange and the second flange; a first sealing member (13) is provided between the first flange and the second flange, and the first sealing member (13) is located on the periphery of the blocking ring (12); The outer wall of the ring sleeve (5) is provided with two groups of through holes (18), the sides of the two groups of through holes (18) facing the axis of the ring sleeve (5) are both connected to the first flange and the second flange on the opposite side, and the inner side walls of the two groups of through holes (18) are provided with multiple groups of second sealing members (19); A third sealing member (20) is provided between the ring sleeve (5) and the first flange, and between the ring sleeve (5) and the second flange; two groups of the third sealing members (20) are respectively slidably connected to the first flange and the second flange; A negative pressure structure and a detection structure are provided on the outer wall of the ring sleeve (5) and inside the mounting shell (6); the negative pressure structure and the detection structure are respectively installed on one of the two groups of through holes (18), the negative pressure structure is used to suck the space between the first flange and the second flange into a vacuum, and the detection structure is used to detect the vacuum degree between the first flange and the second flange; A locking structure is provided between the ring sleeve (5) and the first pipe member (3) or the second pipe member (4), the locking structure being used to drive the first flange and the second flange to fit together so as to squeeze the first sealing member (13); The negative pressure structure, the detection structure and the locking structure are electrically connected to the microcontroller (15) respectively; A negative pressure area is formed between the first flange, the second flange and the inner side wall of the ring sleeve (5) through the first seal (13), the second seal (19) and the third seal (20). When the first seal (13) shrinks due to aging and causes leakage, the detection structure detects that the negative pressure state of the negative pressure area has changed, and the microcontroller (15) controls the locking structure to drive the first flange and the second flange to move closer to each other, so as to squeeze the first seal (13) so that the first seal (13) resumes its sealing function.

2. The sealing and leak-proof pipe fitting for a heat exchanger according to claim 1, characterized in that: A first groove (11) is provided on one side of the first flange and the second flange opposite to each other and close to the axis, and the shielding ring (12) is slidably connected between the two groups of the first grooves (11); A third groove (25) is provided between the first flange and the second flange on opposite sides, and the first sealing member (13) is provided between two groups of the third grooves (25); The inner side wall of the ring sleeve (5) is provided with two groups of second grooves (24) in an axially distributed manner, and the third sealing member (20) is provided in both groups of the second grooves (24).

3. The sealing and leak-proof pipe fitting for a heat exchanger according to claim 1, characterized in that: The ring sleeve (5) is provided with a limiting structure for limiting the axial relative position of the ring sleeve (5) and the first flange and the second flange; The limiting structure comprises two groups of limiting screws (23), both groups of limiting screws (23) are threadedly connected to the outer wall of the ring sleeve (5), one end of the two groups of limiting screws (23) facing the axis of the ring sleeve (5) passes through the ring sleeve (5) and extends into the inside of the ring sleeve (5), the first flange and the second flange are located between the ends of the two groups of limiting screws (23) extending into the inside of the ring sleeve (5), and the axial movement range between the ring sleeve (5) and the first flange and the second flange is limited by the two groups of limiting screws (23).

4. The sealing and leak-proof pipe fitting for a heat exchanger according to claim 1, characterized in that: The negative pressure structure is a micro vacuum pump (16), and the inlet end of the micro vacuum pump (16) is connected to the through hole (18) via an air suction pipe (1601).

5. The sealing and leak-proof pipe fitting for a heat exchanger according to claim 1, characterized in that: The detection structure is a vacuum sensor (17), and the detection end of the vacuum sensor (17) is installed in the corresponding through hole (18) and is sealed by multiple groups of the second sealing members (19).

6. The sealing and leak-proof pipe fitting for a heat exchanger according to claim 1, characterized in that: The locking structure comprises two groups of pen-type electric telescopic rods (14), and the extension shafts of the two groups of pen-type electric telescopic rods (14) both pass through the first flange and are fixedly connected to the second flange.

7. The sealing and leak-proof pipe fitting for a heat exchanger according to claim 1, characterized in that: A guide structure is also provided between the first flange and the second flange for guiding the locking structure when it is in action; The guide structure comprises two groups of guide columns (22) and two groups of guide holes (21); the two groups of guide holes (21) are both arranged in a through-going shape on the inner wall of the second flange and are respectively located on both sides of the second pipe member (4); the two groups of guide columns (22) are both fixedly connected to the side of the first flange facing the second flange and are respectively axially opposite to the two groups of guide holes (21); the two groups of guide columns (22) are respectively slidably connected to the inner side wall of one group of guide holes (21).

8. The sealing and leak-proof pipe fitting for a heat exchanger according to claim 1, characterized in that: An alarm structure for alarming is arranged on the outer wall of the mounting shell (6); the alarm structure comprises a buzzer (8) and an alarm light (9); the buzzer (8) and the alarm light (9) are fixedly connected to the outer wall of the mounting shell (6) in sequence; and the buzzer (8) and the alarm light (9) are both electrically connected to the microcontroller (15).

9. The sealing and leak-proof pipe fitting for a heat exchanger according to claim 1, characterized in that: Ventilation windows (7) are provided on two opposite side walls of the installation shell (6).

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