Sealing test platform for refrigeration dividing wall type heat exchanger

Abstract

The invention belongs to the technical field of dividing wall type heat exchanger testing, and discloses a refrigeration dividing wall type heat exchanger sealing test platform which comprises a supporting assembly, an air source assembly and a first sealing assembly are installed on the supporting assembly, the first sealing assembly is connected with the air source assembly, and the first sealing assembly comprises a connecting disc. An annular sealing gasket is embedded in the connecting end of the connecting disc, a connecting sleeve is fixedly connected to the inner wall of the connecting disc, a connecting pipe is fixedly connected to the narrow end of an opening of the connecting sleeve, and a plurality of supporting frames are fixedly connected to the outer wall of the connecting disc in an annular structure at equal intervals. Through a clamping structure composed of the supporting frame, the sliding groove, the clamping plate and the air cylinder, the air cylinder drives the clamping plate to slide along the sliding groove, the heat exchanger can be rapidly and accurately connected, compared with a traditional flange connecting mode, the connecting efficiency is improved, the manual operation time is shortened, the labor intensity is reduced, meanwhile, the connecting stability is ensured, and the production efficiency is improved. The test accuracy is ensured.

Description

Technical Field

[0001] The present invention relates to the field of testing of partition heat exchangers, and more specifically, to a sealing test platform for a refrigeration partition heat exchanger. Background Art

[0002] A partition heat exchanger separates hot and cold fluids through a partition and conducts heat exchange. Its sealing performance is related to operation efficiency and safety. The sealing test of a partition heat exchanger is an operation that, for the sealing parts such as the connection parts and the pipe walls of the heat exchanger, simulates actual working conditions to apply conditions such as pressure and temperature, and detects whether there is gas or liquid leakage. During the test, a gas or liquid with a certain pressure is filled into the heat exchanger, and the pressure change is monitored through a pressure sensor, and the tightness of the sealing part is judged by using tracer gas detection or observing liquid leakage, etc.

[0003] In the existing sealing test platform for partition heat exchangers, when connecting the heat exchanger, the flange connection method is usually adopted. By setting flange plates at the interface parts of the heat exchanger and tightly fixing the flange plates by bolts, although this method can ensure good sealing performance, there are still drawbacks in terms of detection efficiency. During the installation process, operations such as screwing and aligning multiple bolts need to be completed in sequence. The steps are cumbersome, consuming a large amount of time and manpower, and it is difficult to achieve fast and efficient connection, thus affecting the overall efficiency of the sealing test. Summary of the Invention

[0004] This application aims to at least solve one of the technical problems existing in the prior art. For this reason, this application proposes a sealing test platform for a refrigeration partition heat exchanger. By driving the clamping plate to slide along the chute through a cylinder, it can be quickly and accurately connected to the heat exchanger. Compared with the traditional flange connection method, the connection efficiency is improved, the manual operation time and labor intensity are reduced, and at the same time, the stability of the connection is ensured, and the test accuracy is guaranteed.

[0005] The present invention proposes a sealing test platform for a refrigeration partition heat exchanger, including a support assembly and a first sealing assembly. A gas source assembly is installed on the support assembly, and the first sealing assembly is connected to the gas source assembly;

[0006] The first sealing assembly includes a connection disk. An annular sealing gasket is embedded at the connection end of the connection disk. A connection sleeve is fixedly connected to the inner wall of the connection disk. A connection pipe is fixedly connected to the end with a narrower opening of the connection sleeve. A plurality of support frames are fixedly connected to the outer wall of the connection disk in an annular equidistant structure. Chutes are opened on the outer walls of the support frames, and L-shaped clamping plates are slidably connected to the inner walls of the chutes. Cylinders are fixedly connected to the ends of the support frames, and the air inlet ends of the cylinders are respectively connected to the gas source assembly.

[0007] Preferably, a first guiding surface is provided at the end of the clamping plate, and the first guiding surface faces the connecting end of the connecting disc and forms an angle with the connecting end.

[0008] Preferably, a plurality of fixing blocks are fixedly connected in an annular equidistant structure on the side end opposite to the connecting end of the connecting disc. Guide rods are fixedly connected to the outer walls of the fixing blocks. The ends of the guide rods penetrate through the clamping plate and slide with it. The axis of the guide rod is parallel to the end face of the connecting disc.

[0009] Preferably, the support assembly includes a mounting base, and a support plate is fixedly connected to the top of the mounting base. The connecting surface between the support plate and the mounting base is perpendicular.

[0010] Preferably, the air source assembly includes an air delivery pump, and the air delivery pump is fixedly connected to the top of the mounting base. The air delivery end of the air delivery pump is fixedly connected to an air delivery pipe. The air delivery pipe penetrates through the support plate and is fixedly connected to it. A pneumatic pressure regulating valve is fixedly installed on the outer wall of the air delivery pipe. The end of the air delivery pipe is connected and communicated with a connecting pipe.

[0011] Preferably, a connecting belt is fixedly connected to the inner wall of the support plate. A second sealing assembly is installed at the end of the connecting belt. An air compressor is fixedly connected to the top of the mounting base, and the air compressor is used to deliver compressed air to the second sealing assembly.

[0012] Preferably, the second sealing assembly includes a sealing disc. A holding pipe is fixedly connected to the end of the sealing disc. An air inlet pipe is fixedly connected to the outer wall of the holding pipe. The end of the air inlet pipe is connected to the second sealing assembly through an air supply pipe.

[0013] Preferably, an air cavity and a movable cavity are provided on the inner wall of the sealing disc. A sealing plug is slidably connected to the inner wall of the sealing disc. A movable ring is fixedly connected to the circumferential outer wall of the sealing plug, and the movable ring is slidably connected to the inner wall of the movable cavity.

[0014] Preferably, an annular mounting groove is provided at the end of the sealing plug, and a sealing ring is sleeved on the inner wall of the mounting groove.

[0015] Preferably, a plurality of fixing frames are fixedly connected to the circumferential outer wall of the sealing disc. Slide holes are provided outside the fixing frames. Slide rods are fixedly connected to the inner walls of the slide holes. Springs are sleeved on the outer walls of the slide rods. Fixed arms are slidably connected to the inner walls of the fixing frames. The ends of the slide rods penetrate through the fixed arms and slide with them. A second guiding surface is provided at the end of the fixed arm. One end of the spring is fixedly connected to the fixing frame, and the other end is fixedly connected to the fixed arm.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. The clamping structure composed of a support frame, a chute, a clamping plate, and a cylinder can quickly and accurately connect with the heat exchanger by driving the clamping plate to slide along the chute through the cylinder. Compared with the traditional flange connection method, it improves the connection efficiency, reduces the manual operation time and labor intensity, and at the same time ensures the connection stability and guarantees the test accuracy.

[0018] 2. The design of the first guiding surface at the end of the clamping plate can play a guiding and positioning role for the heat exchanger during the process of clamping the heat exchanger. When the cylinder pushes the clamping plate to move, the first guiding surface can correct the relative position between the heat exchanger and the connection plate, reduce the problem of poor fitting caused by errors in manual installation, further enhance the sealing effect, and reduce the possibility of gas leakage from the connection during the test.

[0019] 3. The fixing block and the guiding rod on the connection plate form a guiding and limiting structure. During the movement of the clamping plate, the guiding rod passes through the clamping plate and restricts it, so that the clamping plate can only slide along the direction parallel to the end face of the connection plate, avoiding the deviation or shaking of the clamping plate. To a certain extent, it can improve the smoothness and accuracy of the clamping action, prevent damage to the heat exchanger caused by unstable clamping, and at the same time can improve the reliability of the sealed connection to a certain extent.

[0020] 4. The air cavity and the movable cavity in the sealing disc, in cooperation with the sealing plug and the movable ring, constitute a flexible adjustable sealing structure. When compressed air enters the air cavity, it pushes the sealing plug to move along the movable cavity, and the movable ring slides in the movable cavity, playing a guiding and limiting role for the sealing plug, ensuring that the sealing plug can move smoothly towards the heat exchanger side to achieve the sealing effect.

[0021] 5. The installation groove at the end of the sealing plug is used to install the sealing ring. As a key sealing component, the sealing ring can further fill the tiny gaps when the sealing plug contacts the flange end face of the heat exchanger, enhancing the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, so they should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of the first sealing assembly of the present invention;

[0025] Figure 3 It is a schematic diagram of the installation structure of the connection sleeve of the present invention;

[0026] Figure 4 This is a schematic diagram of the installation structure of the clamping plate of the present invention;

[0027] Figure 5 This is a schematic diagram of the overall structure of the second sealing assembly of the present invention;

[0028] Figure 6 This is a schematic diagram of the installation structure of the holding tube of the present invention;

[0029] Figure 7 This is a schematic diagram of the installation structure of the sealing plug of the present invention;

[0030] Figure 8 This is a schematic diagram of the installation structure of the fixed arm of the present invention.

[0031] Explanation of the reference numerals in the figure: 1, mounting base; 2, air delivery pump; 3, air delivery pipe; 4, air pressure regulating valve; 5, first sealing assembly; 501, connecting disc; 502, sealing gasket; 503, connecting sleeve; 504, connecting pipe; 505, support frame; 506, chute; 507, clamping plate; 508, first guiding surface; 509, air cylinder; 510, fixed block; 511, guiding rod; 6, air compressor; 7, support plate; 8, connecting belt; 9, second sealing assembly; 901, sealing disc; 902, holding tube; 903, air inlet pipe; 904, air cavity; 905, movable cavity; 906, sealing plug; 907, movable ring; 908, mounting groove; 909, sealing ring; 910, fixed frame; 911, sliding hole; 912, sliding rod; 913, spring; 914, fixed arm; 915, second guiding surface. Detailed implementation manners

[0032] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application. The following will make a detailed description of the specific implementation manners of the present invention with reference to the accompanying drawings of the specification.

[0033] As Figures 1-4 shown, a sealing test platform for a refrigerating partition heat exchanger includes a support assembly and a first sealing assembly 5. A gas source assembly is installed on the support assembly, and the first sealing assembly 5 is connected to the gas source assembly. The gas source assembly includes an air compressor 6;

[0034] The first sealing assembly 5 includes a connecting disc 501. An annular gasket 502 is embedded at the connecting end of the connecting disc 501. A connecting sleeve 503 is fixedly connected to the inner wall of the connecting disc 501. A connecting pipe 504 is fixedly connected to the narrower open end of the connecting sleeve 503. A plurality of support frames 505 are fixedly connected to the outer wall of the connecting disc 501 in an annular equidistant structure. Slide grooves 506 are formed in the outer walls of the support frames 505. L-shaped clamping plates 507 are slidably connected to the inner walls of the slide grooves 506. An air cylinder 509 is fixedly connected to the end of the support frame 505. The air inlet ends of the air cylinders 509 are respectively connected to the air source assembly. An air compressor 6 is connected to the plurality of air cylinders 509.

[0035] The air compressor 6, as the core of the air source assembly, provides power for the air cylinders 509 to achieve automatic clamping.

[0036] In the first sealing assembly 5, when the gasket 502 of the connecting disc 501 is connecting the heat exchanger, it can effectively fill the gap and initially isolate the gas leakage channel.

[0037] The connecting sleeve 503 and the connecting pipe 504 form a stable gas transmission path to ensure the smooth delivery of the test gas.

[0038] The clamping structure composed of the support frames 505, the slide grooves 506, the clamping plates 507 and the air cylinders 509 can quickly and accurately connect with the heat exchanger by driving the clamping plates 507 to slide along the slide grooves 506 through the air cylinders 509. Compared with the traditional flange connection method, the connection efficiency is improved, the manual operation time and labor intensity are reduced, and at the same time, the connection stability is ensured to guarantee the test accuracy.

[0039] As Figure 4 shown, in some embodiments, a first guiding surface 508 is formed at the end of the clamping plate 507. The first guiding surface 508 faces the connecting end of the connecting disc 501 and forms an angle with the connecting end.

[0040] The design of the first guiding surface 508 at the end of the clamping plate 507 can play a guiding and positioning role for the heat exchanger during the clamping process. When the air cylinder 509 pushes the clamping plate 507 to move, the first guiding surface 508 can correct the relative position of the heat exchanger and the connecting disc 501, reduce the problem of poor fitting caused by errors in manual installation, further enhance the sealing effect, and reduce the possibility of gas leakage from the connection during the test.

[0041] As Figure 4 shown, in some embodiments, a plurality of fixing blocks 510 are fixedly connected to the side end opposite to the connecting end of the connecting disc 501 in an annular equidistant structure. Guide rods 511 are fixedly connected to the outer walls of the fixing blocks 510. The ends of the guide rods 511 penetrate through the clamping plates 507 and are slidably connected to them. The axes of the guide rods 511 are parallel to the end face of the connecting disc 501.

[0042] The fixing block 510 and the guide rod 511 on the connection plate 501 constitute a guide limit structure. During the movement of the clamping plate 507, the guide rod 511 penetrates the clamping plate 507 and constrains it, so that the clamping plate 507 can only slide in a direction parallel to the end surface of the connection plate 501, avoiding the clamping plate 507 from deflecting or shaking, which can improve the stability and accuracy of the clamping action to a certain extent, prevent damage to the heat exchanger due to unstable clamping, and at the same time improve the reliability of the sealed connection to a certain extent.

[0043] like Figure 1 As shown, in some embodiments, the support assembly includes a mounting seat 1 , a support plate 7 is fixedly connected to the top of the mounting seat 1 , and the support plate 7 is perpendicular to the connection surface of the mounting seat 1 .

[0044] The mounting seat 1 in the support assembly is vertically connected to the support plate 7 to form a stable "L"-shaped support structure, providing a solid and reliable installation frame for the air pump 2 and the air compressor 6.

[0045] like Figure 1 As shown, in some embodiments, the air source assembly also includes an air pump 2, which is fixedly connected to the top of the mounting base 1, and the air delivery end of the air pump 2 is fixedly connected to an air pipe 3, which passes through the support plate 7 and is fixedly connected thereto, and an air pressure regulating valve 4 is fixedly installed on the outer wall of the air pipe 3, and the end of the air pipe 3 is connected and communicated with the connecting pipe 504, and the air compressor 6 is fixedly installed on the top of the mounting base 1.

[0046] The coordinated operation of the gas pump 2, the gas pipe 3 and the gas pressure regulating valve 4 in the gas source assembly can achieve the regulation of the test gas pressure.

[0047] like Figure 1 As shown, in some embodiments, a connecting belt 8 is fixedly connected to the inner wall of the support plate 7, a second sealing assembly 9 is installed at the end of the connecting belt 8, and an air compressor 6 is fixedly connected to the top of the mounting seat 1, and the air compressor 6 is used to deliver compressed air to the second sealing assembly 9.

[0048] The connecting strip 8 on the inner wall of the support plate 7 is used to install the second sealing assembly 9, so that the second sealing assembly 9 cooperates with the first sealing assembly 5 to achieve sealing of both ends of the heat exchanger. The air compressor 6 delivers compressed air to the second sealing assembly 9.

[0049] like Figures 5-8 As shown, in some embodiments, the second sealing assembly 9 includes a sealing disk 901, the end of the sealing disk 901 is fixedly connected to a holding tube 902, the outer wall of the holding tube 902 is fixedly connected to an air intake pipe 903, and the end of the air intake pipe 903 is connected to the second sealing assembly 9 via an air supply pipe.

[0050] The holding tube 902 facilitates the operator to hold and operate, and docks the sealing disc 901 with the flange at the other end of the heat exchanger; the air inlet pipe 903 is connected to the air supply pipe to ensure that the compressed air output by the air compressor 6 can smoothly enter the air cavity 904 of the sealing disc 901, providing power for the movement of the sealing plug 906.

[0051] As Figure 7 shown, in some embodiments, an air cavity 904 and a movable cavity 905 are provided on the inner wall of the sealing disc 901. A sealing plug 906 is slidably connected to the inner wall of the sealing disc 901. A movable ring 907 is fixedly connected to the outer circumferential wall of the sealing plug 906, and the movable ring 907 is slidably connected to the inner wall of the movable cavity 905.

[0052] The air cavity 904 and the movable cavity 905 in the sealing disc 901, in cooperation with the sealing plug 906 and the movable ring 907, constitute a flexibly adjustable sealing structure. When compressed air enters the air cavity 904, it pushes the sealing plug 906 to move along the movable cavity 905, and the movable ring 907 slides in the movable cavity 905, playing a guiding and limiting role for the sealing plug 906 to ensure that the sealing plug 906 can smoothly move towards the heat exchanger side to achieve the sealing effect.

[0053] As Figure 6 and Figure 7 shown, in some embodiments, an annular mounting groove 908 is provided at the end of the sealing plug 906, and a sealing ring 909 is sleeved on the inner wall of the mounting groove 908.

[0054] The mounting groove 908 at the end of the sealing plug 906 is used to mount the sealing ring 909. As a key sealing component, the sealing ring 909 can further fill the tiny gaps when the sealing plug 906 contacts the flange end face of the heat exchanger, enhancing the sealing effect.

[0055] As Figure 6 and Figure 8 shown, in some embodiments, a plurality of fixing frames 910 are fixedly connected to the outer circumferential wall of the sealing disc 901. Slide holes 911 are provided outside the fixing frames 910, slide rods 912 are fixedly connected to the inner walls of the slide holes 911, springs 913 are sleeved on the outer walls of the slide rods 912, fixing arms 914 are slidably connected to the inner walls of the fixing frames 910, the ends of the slide rods 912 penetrate through the fixing arms 914 and are slidably connected thereto, second guiding surfaces 915 are provided at the ends of the fixing arms 914, and one end of each spring 913 is fixedly connected to the fixing frame 910 and the other end is fixedly connected to the fixing arm 914.

[0056] When the sealing disc 901 is docked with the flange of the heat exchanger, the flange presses the second guiding surface 915 at the end of the fixing arm 914, causing the fixing arm 914 to move outward against the elastic force of the spring 913; subsequently, under the elastic force of the spring 913, the fixing arm 914 moves inward to clamp and fix the flange end of the heat exchanger.

[0057] Working principle: During the test, first, the connecting plate 501 is butted against the flange at the air inlet end of the partition heat exchanger.

[0058] The air compressor 6 injects compressed air into the cylinder 509. The cylinder 509 starts and pushes the clamping plate 507 to move. By using the first guiding surface 508 at the end of the clamping plate 507, the heat exchanger is closely attached to the connecting plate 501 to achieve installation.

[0059] The gasket 502 plays a preliminary sealing role. At the same time, the guiding rod 511 guides the clamping plate 507 to ensure the stability of clamping.

[0060] The sealing disc 901 is butted against the flange at the other end of the partition heat exchanger. The flange squeezes the second guiding surface 915. At this time, under the action of the spring 913, the fixed arm 914 clamps the flange. The air compressor 6 supplies compressed air to the second sealing assembly 9 through the air supply pipe. The compressed air enters the air cavity 904 of the sealing disc 901 and pushes the sealing plug 906 to move towards the heat exchanger side. The sealing ring 909 is in close contact with the flange end face of the heat exchanger to achieve sealing. The fixed arm 914 moves inwards under the elastic force of the spring 913 to fix the flange end of the heat exchanger and conduct sealing to avoid gas leakage during the test.

[0061] The gas delivery pump 2 supplies gas to the first sealing assembly 5 through the gas delivery pipe 3. The pressure regulating valve 4 can adjust the gas delivery pressure. The refrigerating partition heat exchanger can be subjected to a sealing test to observe whether there is gas leakage, so as to judge the sealing performance of the heat exchanger.

[0062] The above shows and describes the basic principle, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A sealed test platform for a refrigerating partition heat exchanger, characterized in that, Including: A support assembly, on which a gas source assembly is installed, and the gas source assembly includes an air compressor (6); A first sealing assembly (5), which is connected to the gas source assembly; The first sealing assembly (5) includes a connection disk (501), an annular gasket (502) is embedded at the connection end of the connection disk (501), a connection sleeve (503) is fixedly connected to the inner wall of the connection disk (501), a connection pipe (504) is fixedly connected to the relatively narrow open end of the connection sleeve (503), a plurality of support frames (505) are fixedly connected to the outer wall of the connection disk (501) in an annular equidistant structure, sliding grooves (506) are formed in the outer walls of the support frames (505), L-shaped clamping plates (507) are slidably connected to the inner walls of the sliding grooves (506), cylinders (509) are fixedly connected to the ends of the support frames (505), the air inlet ends of the cylinders (509) are respectively connected to the gas source assembly, and the air compressor (6) is connected to the plurality of cylinders (509).

2. The sealing test platform of the refrigerating partition heat exchanger according to claim 1, characterized in that: A first guiding surface (508) is formed at the end of the clamping plate (507), the first guiding surface (508) faces the connection end of the connection disk (501) and forms an angle with the connection end.

3. The refrigeration partition heat exchanger sealing test platform according to claim 2, characterized in that: A plurality of fixing blocks (510) are fixedly connected to the opposite side end of the connection end of the connection disk (501) in an annular equidistant structure, guiding rods (511) are fixedly connected to the outer walls of the fixing blocks (510), the ends of the guiding rods (511) penetrate through the clamping plate (507) and are slidable with it, and the axes of the guiding rods (511) are parallel to the end face of the connection disk (501).

4. The refrigerating partition heat exchanger sealing test platform according to claim 3, characterized in that: The support assembly includes a mounting base (1), a support plate (7) is fixedly connected to the top of the mounting base (1), and the connection surface between the support plate (7) and the mounting base (1) is perpendicular.

5. The hermetic test platform for the refrigerating partition heat exchanger according to claim 4, characterized in that: The gas source assembly further includes a gas delivery pump (2), the gas delivery pump (2) is fixedly connected to the top of the mounting base (1), a gas delivery pipe (3) is fixedly connected to the gas delivery end of the gas delivery pump (2), the gas delivery pipe (3) penetrates through the support plate (7) and is fixedly connected to it, a pressure regulating valve (4) is fixedly installed on the outer wall of the gas delivery pipe (3), the end of the gas delivery pipe (3) is connected and communicated with the connection pipe (504), and the air compressor (6) is fixedly installed on the top of the mounting base (1).

6. The hermetic test platform for a refrigerating partition heat exchanger according to claim 5, characterized in that: A connection belt (8) is fixedly connected to the inner wall of the support plate (7), a second sealing assembly (9) is installed at the end of the connection belt (8), and the air compressor (6) is used to deliver compressed air to the second sealing assembly (9).

7. The sealed test platform of the refrigerating partition heat exchanger according to claim 6, characterized in that: The second sealing assembly (9) includes a sealing disk (901), a holding pipe (902) is fixedly connected to the end of the sealing disk (901), an air inlet pipe (903) is fixedly connected to the outer wall of the holding pipe (902), and the end of the air inlet pipe (903) is connected to the second sealing assembly (9) through a supply pipe.

8. The sealed test platform for the refrigerating partition heat exchanger according to claim 7, wherein: An air cavity (904) and a movable cavity (905) are formed in the inner wall of the sealing disc (901). A sealing plug (906) is slidably connected to the inner wall of the sealing disc (901). A movable ring (907) is fixedly connected to the circumferential outer wall of the sealing plug (906), and the movable ring (907) is slidably connected to the inner wall of the movable cavity (905).

9. The sealed test platform for the refrigerating partition heat exchanger according to claim 8, characterized in that: An annular mounting groove (908) is formed at the end of the sealing plug (906), and a sealing ring (909) is sleeved on the inner wall of the mounting groove (908).

10. The sealed test platform of the refrigerating partition heat exchanger according to claim 9, characterized in that: A plurality of fixing frames (910) are fixedly connected to the circumferential outer wall of the sealing disc (901). A sliding hole (911) is formed outside the fixing frame (910). A sliding rod (912) is fixedly connected to the inner wall of each sliding hole (911). A spring (913) is sleeved on the outer wall of each sliding rod (912). A fixing arm (914) is slidably connected to the inner wall of each fixing frame (910). The end of the sliding rod (912) penetrates through the fixing arm (914) and is slidably connected thereto. A second guiding surface (915) is formed at the end of the fixing arm (914). One end of the spring (913) is fixedly connected to the fixing frame (910), and the other end is fixedly connected to the fixing arm (914).

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