Air pipe device with interlayer inner wall

Abstract

The invention relates to the technical field of air conditioner air pipe connection, and provides an air pipe device with an interlayer inner wall, the air pipe device comprises an outer pipe, an inner pipe, a connecting part and a vacuum pump, the inner pipe is connected to the inner side of the outer pipe through the connecting part, and the inner pipe is used for air circulation; and a vacuum cavity is formed among the inner pipe, the outer pipe and the connecting part. The connecting part is arranged between the outer pipe and the inner pipe in a surrounding mode, so that a vacuum cavity can be formed between the outer pipe and the inner pipe, the vacuum cavity is vacuumized through an external vacuum pump, noise transmitted to the outer pipe by the inner pipe is reduced, and meanwhile the vacuum interlayer has the heat insulation or heat preservation function; in this way, when airflow circulates in the inner pipe to cause vibration of the inner pipe, the connecting plate moves relative to the top plate, and the first sealing sleeve and the second sealing sleeve seal and shield the joint of the top plate and the connecting plate, so that vibration noise transmitted to the outer pipe by the inner pipe is reduced, noise transmitted to the outside by the outer pipe is reduced, and use is convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of air-conditioning duct connection, and particularly to an air duct device with a sandwich inner wall. Background Art

[0002] An air-conditioning duct is a pipe used in an air-conditioning system, mainly responsible for transporting and distributing the processed air. In a central air-conditioning system, the air-conditioning duct connects the air-conditioning main unit with each air-conditioning terminal device (such as air vents, outlets, etc.) to achieve the transmission and distribution of cold or hot air.

[0003] The invention with the publication number CN112128958B proposes an air-conditioning duct assembly, including an air-conditioning duct, a sensor, and a dust-proof cover. The air flow flows along the axial direction of the air-conditioning duct. The sensor is used to detect the parameters of the air in the air-conditioning duct. The dust-proof cover is fixedly arranged on the pipe wall of the air-conditioning duct, and the sensor is fixed in the dust-proof cover. However, when a conventional air-conditioning duct is used, it will generate relatively large vibration and noise. In addition to vibration, it is also prone to condensate, and it is necessary to cover insulating materials and noise-reducing materials. In actual application, in order to reduce the impact of the noise generated by the use of the air-conditioning duct on the surrounding environment and isolate the condensate at the same time, usually only a thick insulating material is covered, but the noise reduction performance of the insulating material is very average. Therefore, this solution particularly proposes an air duct device with a sandwich inner wall to solve the problems of vibration noise and condensate inside the air duct by using the sandwich inner wall of the air duct. Summary of the Invention

[0004] In view of this, the present invention proposes an air duct device with a sandwich inner wall to solve the technical problems that only a relatively thick insulating material is covered outside a conventional air-conditioning duct, resulting in vibration noise of the air duct and condensate inside the air duct.

[0005] The technical solution of the present invention is realized as follows: The present invention provides an air duct device with a sandwich inner wall, including an outer pipe, an inner pipe, a connecting component, and a vacuum pump. The inner pipe is connected to the inside of the outer pipe through the connecting component. The inner pipe is used for gas to flow through. A vacuum chamber is formed between the inner pipe, the outer pipe, and the connecting component. The connecting component includes a top plate, a connecting plate, a first sealing sleeve, and a second sealing sleeve, wherein,

[0006] The top plate is arranged on the top wall of the inner cavity of the outer pipe, and the connecting plate is movably connected to the top plate. The connecting plate is fixedly connected to the inner pipe;

[0007] The first sealing sleeve is arranged between the top plate and the connecting plate for sealing and covering the connection between the top plate and the connecting plate;

[0008] The second sealing sleeve is arranged between the top plate and the inner side wall of the outer pipe and is fixedly connected to the outer surface of the inner pipe. The second sealing sleeve is in sealing fit with the top plate, the outer pipe, and the inner pipe;

[0009] A connecting pipe communicating with the vacuum cavity is connected to the outer pipe. An air extraction pipe is connected to the air inlet end of the vacuum pump. The air extraction pipe is communicated with the connecting pipe, and the air extraction pipe is connected to the connecting pipe through a flange.

[0010] On the basis of the above technical solution, preferably, both the outer pipe and the inner pipe are square pipes.

[0011] On the basis of the above technical solution, preferably, the connecting component further includes a union cylinder and a first spring, wherein,

[0012] A limiting groove is formed in the top plate. The union cylinder is fixedly connected to one end of the connecting plate away from the inner pipe, and the end wall of the union cylinder is aligned with the end wall of the top plate in the vertical direction. The union cylinder is inserted into the inner side of the limiting groove, and the limiting groove is used to limit the up-and-down sliding and rotation of the union cylinder in the top plate;

[0013] The first spring is arranged between the union cylinder and the top plate and is used to reset the moving position of the union cylinder.

[0014] On the basis of the above technical solution, preferably, the connecting component further includes a limiting cover, wherein,

[0015] The limiting cover is a limiting round cover. The first spring is located inside the limiting cover and extends out of the limiting cover. The two ends of the first spring are respectively fixedly connected to the groove wall of the limiting groove and the union cylinder, and the first spring abuts against the inner wall of the limiting cover.

[0016] On the basis of the above technical solution, preferably, it further includes a sealing plug, a second spring and a locking bolt, wherein,

[0017] The sealing plug includes a cylinder body. The cylinder body is inserted into the inside of the connecting pipe and is in sealed fit with the inner wall of the connecting pipe. A top ventilation hole is formed in the top of the cylinder body, and a side ventilation hole is formed in the circumferential side of the cylinder body. The top ventilation hole is communicated with the side ventilation hole. The air extraction pipe is inserted into the inside of the connecting pipe and is in sealed fit with the inner wall of the connecting pipe. The air extraction pipe abuts against the top wall of the cylinder body and is communicated with the top ventilation hole;

[0018] The second spring is arranged between the cylinder body and the outer pipe and is used to reset the insertion position of the cylinder body;

[0019] The locking bolt is in threaded connection with the connecting pipe and the cylinder body and is used to position the position of the cylinder body.

[0020] On the basis of the above technical solution, preferably, the sealing plug further includes a cone, wherein,

[0021] A cone is arranged below the cylinder. When the cylinder slides, the cone abuts against the top wall of the inner cavity of the outer tube, and both ends of the second spring are fixedly connected to the cone and the top wall of the inner cavity of the outer tube respectively.

[0022] Based on the above technical solution, preferably, it further includes an anemometer, wherein,

[0023] A first assembly hole is formed on the outer tube, a connection hole aligned with the first assembly hole is formed on the inner tube, the anemometer is inserted into the first assembly hole and the connection hole and extends to the inner side of the inner tube for monitoring the wind speed of the air flow passing through the inner tube.

[0024] Based on the above technical solution, preferably, it further includes a sealing ring sleeve and a connecting ring, wherein,

[0025] The sealing ring sleeve is arranged inside the connection hole, an embedding groove is formed on the inner side of the sealing ring sleeve, the connecting ring is embedded inside the embedding groove, the sealing ring sleeve is hermetically connected to the connecting ring and the hole wall of the connection hole, and the anemometer is inserted into the inner side of the connecting ring;

[0026] The distance between the inner cavity walls of the outer tube in the height direction is W1, the distance between the cavity walls of the vacuum cavity in the height direction is W2, and the distance between the side wall of the connecting ring and the hole wall of the connection hole is W3. W1 / 11 ≤ W2 ≤ W1 / 9, and W2 / 15 ≤ W3 ≤ W2 / 12.

[0027] Based on the above technical solution, preferably, it further includes a guiding ring, wherein,

[0028] The guiding ring is connected to the top of the connecting ring, and the inner side wall of the guiding ring is an inclined side wall.

[0029] Based on the above technical solution, preferably, it further includes a mounting plate, a clamping plate and a filter screen, wherein,

[0030] A second assembly hole is formed on the outer tube, the mounting plate is fixedly connected to the clamping plate, the clamping plate is inserted into the second assembly hole and extends to the bottom wall of the inner cavity of the outer tube, the outer surface of the clamping plate is hermetically attached to the inner wall of the outer tube, and the length of the mounting plate is greater than the length of the clamping plate;

[0031] A ring groove is formed on the inner side of the clamping plate, the filter screen is inserted into the ring groove and is hermetically connected to the clamping plate, and the filter screen is located on one side of the end of the inner tube.

[0032] The air duct device with a sandwich inner wall of the present invention has the following beneficial effects compared with the prior art:

[0033] (1) A connecting component is used to enclose between the outer pipe and the inner pipe, so that a vacuum chamber can be formed between the outer pipe and the inner pipe. The vacuum chamber is evacuated by an external vacuum pump to reduce the noise transmitted from the inner pipe to the outer pipe, and further reduce the noise transmitted from the outer pipe to the outside. By setting the connecting component to include a top plate and a connecting plate, when the airflow flowing in the inner pipe causes the inner pipe to vibrate, the connecting plate moves relative to the top plate, and the first sealing sleeve and the second sealing sleeve seal and block the connection between the top plate and the connecting plate, thereby reducing the vibration noise transmitted from the inner pipe to the outer pipe, and further reducing the noise transmitted from the outer pipe to the outside, which is convenient for use.

[0034] (2) By setting a sealing plug to block the connecting pipe, when connecting the exhaust pipe and the connecting pipe, the exhaust pipe is inserted into the inside of the connecting pipe. After the vacuum chamber is adjusted to a vacuum, the exhaust pipe is pulled out by half. At this time, the exhaust pipe is separated from the cylinder, and the cylinder is completely inserted into the inside of the connecting pipe again under the action of the second spring. The insertion position of the cylinder is locked by a locking bolt, so as to complete the rapid blocking treatment of the connecting pipe. After the blocking is completed, the exhaust pipe can be taken out, so that the vacuum pump can be taken away from the outer pipe, and the vacuum pump can repeatedly evacuate multiple air ducts, which is convenient for use.

[0035] (3) By setting an anemometer to extend into the inside of the inner pipe, the anemometer can continuously monitor the air velocity of the airflow in the inner pipe. By setting the anemometer to pass through the inside of the connecting ring, and the connecting ring is connected to the inner pipe through a sealing ring sleeve, when the anemometer is specifically used, the anemometer can deflect and move relative to the inner pipe, and further the connecting plate can move relative to the top plate, which is convenient for shock absorption connection of the inner pipe and is convenient for use. Description of the Drawings

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0037] Figure 1 Isometric view of the air duct device with a sandwich inner wall of the present invention;

[0038] Figure 2 Right view of the air duct device with a sandwich inner wall of the present invention;

[0039] Figure 3 For the air duct device with a sandwich inner wall of the present invention Figure 2 Cross-sectional view of the structure at the A-A position shown;

[0040] Figure 4Schematic diagram of the air duct device with a sandwich inner wall according to the present invention Figure 3 Enlarged schematic diagram at position B shown in the figure

[0041] Figure 5 Schematic diagram of the air duct device with a sandwich inner wall according to the present invention Figure 3 Enlarged schematic diagram at position C shown in the figure

[0042] Figure 6 Schematic diagram of the air duct device with a sandwich inner wall according to the present invention Figure 3 Enlarged schematic diagram at position D shown in the figure

[0043] Figure 7 Schematic diagram of the state of the air duct device with a sandwich inner wall according to the present invention after detaching the outer pipe

[0044] Figure 8 Three-dimensional schematic diagram of the structure at the inner pipe of the air duct device with a sandwich inner wall according to the present invention

[0045] Figure 9 Three-dimensional schematic diagram of the structure at the connecting component of the air duct device with a sandwich inner wall according to the present invention

[0046] Figure 10 Schematic diagram of the air duct device with a sandwich inner wall according to the present invention Figure 9 Front view of the structure shown in the figure

[0047] Figure 11 Schematic diagram of the air duct device with a sandwich inner wall according to the present invention Figure 10 Cross-sectional view of the structure at E-E shown in the figure

[0048] Figure 12 Three-dimensional schematic diagram of the structure at the connecting pipe of the air duct device with a sandwich inner wall according to the present invention

[0049] Figure 13 Three-dimensional schematic diagram of the sealing ring sleeve of the air duct device with a sandwich inner wall according to the present invention

[0050] In the figure: 11, outer tube; 111, first assembly hole; 112, second assembly hole; 12, inner tube; 121, connection hole; 13, vacuum chamber; 2, connection component; 21, top plate; 211, limit groove; 22, connecting plate; 23, first sealing sleeve; 24, second sealing sleeve; 25, union cylinder; 26, limit cover; 27, first spring; 31, connecting pipe; 32, vacuum pump; 33, suction pipe; 34, flange; 41, sealing plug; 411, cylinder body; 4111, top ventilation hole; 4112, side ventilation hole; 412, cone; 42, second spring; 43, locking bolt; 5, anemometer; 51, first mounting side plate; 61, sealing ring sleeve; 611, embedding groove; 62, connecting ring; 63, guiding ring; 71, mounting plate; 711, second mounting side plate; 72, clamping plate; 721, annular groove; 73, filter screen. Detailed implementation mode

[0051] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0052] As Figures 1 to 13 shown, the air duct device with a sandwich inner wall of the present invention includes an outer tube 11, an inner tube 12, a connection component 2 and a vacuum pump 32. The inner tube 12 is connected to the inner side of the outer tube 11 through the connection component 2. The inner tube 12 is used for gas circulation. A vacuum chamber 13 is formed between the inner tube 12, the outer tube 11 and the connection component 2. The vacuum sandwich also has the function of heat insulation or heat preservation, just like a thermos cup with a sandwich or double-layer glass, which can keep warm; the connection component 2 includes a top plate 21, a connecting plate 22, a first sealing sleeve 23 and a second sealing sleeve 24. Among them, the top plate 21 is arranged on the top wall of the inner cavity of the outer tube 11, and the connecting plate 22 is movably connected to the top plate 21. The connecting plate 22 is fixedly connected to the inner tube 12; the first sealing sleeve 23 is arranged between the top plate 21 and the connecting plate 22 for sealing and covering the connection between the top plate 21 and the connecting plate 22; the second sealing sleeve 24 is arranged between the top plate 21 and the inner side wall of the outer tube 11 and is fixedly connected to the outer surface of the inner tube 12. The second sealing sleeve 24 is in sealing fit with the top plate 21, the outer tube 11 and the inner tube 12; a connecting pipe 31 communicating with the vacuum chamber 13 is connected to the outer tube 11. The intake end of the vacuum pump 32 is connected to a suction pipe 33, and the suction pipe 33 is connected to the connecting pipe 31. The suction pipe 33 is connected to the connecting pipe 31 through a flange 34.

[0053] In specific implementation, the number of the connection components 2 is two, and the two connection components 2 are respectively arranged at both ends of the inner tube 12.

[0054] Preferably, both the first sealing sleeve 23 and the second sealing sleeve 24 are carbon fiber composite sealing sleeves.

[0055] In a specific implementation, the connecting component 2 is enclosed between the outer pipe 11 and the inner pipe 12, so that a vacuum cavity 13 can be formed between the outer pipe 11 and the inner pipe 12. The vacuum cavity 13 is evacuated by an external vacuum pump 32. By vacuum isolating the outer pipe 11 and the inner pipe 12, when the air flows through the inner pipe 12, the noise transmitted from the inner pipe 12 to the outer pipe 11 can be reduced, and further the noise transmitted from the outer pipe 11 to the outside can be reduced. By setting the connecting component 2 to include a top plate 21 and a connecting plate 22, when the air flow in the inner pipe 12 causes the inner pipe 12 to vibrate, the inner pipe 12 can drive the connecting plate 22 to move relative to the top plate 21. The moving modes include moving in the length and height directions of the outer pipe 11. Thus, by the connecting plate 22 moving on the top plate 21, the vibration effect transmitted from the connecting plate 22 to the top plate 21 can be reduced. The connection between the top plate 21 and the connecting plate 22 is shielded by the first sealing sleeve 23 and the second sealing sleeve 24, so as to prevent the connecting plate 22 from moving relative to the top plate 21 to cause gas leakage, and further improve the sealing effect on the vacuum cavity 13. The air duct connection structure of the present application separates the outer pipe 11 and the inner pipe 12 through the vacuum cavity 13, and at the same time reduces the vibration noise transmitted from the inner pipe 12 to the outer pipe 11, and further reduces the noise transmitted from the outer pipe 11 to the outside, which is convenient for use.

[0056] As Figures 1 to 2 shown, as a preferred implementation manner, both the outer pipe 11 and the inner pipe 12 are square pipes.

[0057] As Figures 3 to 11 shown, as a preferred implementation manner, the connecting component 2 further includes a union cylinder 25 and a first spring 27. Among them, a limit groove 211 is opened on the top plate 21. The union cylinder 25 is fixedly connected to the end of the connecting plate 22 away from the inner pipe 12, and the end wall of the union cylinder 25 is aligned with the end wall of the top plate 21 in the vertical direction. The union cylinder 25 is inserted into the inside of the limit groove 211. The limit groove 211 is used to limit the up and down sliding and rotation of the union cylinder 25 in the top plate 21; the first spring 27 is arranged between the union cylinder 25 and the top plate 21 and is used to reset the moving position of the union cylinder 25.

[0058] In a specific implementation, the groove wall of the limit groove 211 seals the union cylinder 25 from the low end of the top plate 21. At the same time, the union cylinder 25 can also slide up and down along the limit groove 211, so that the connecting plate 22 can move freely relative to the top plate 21. Since the union cylinder 25 moves inside the limit groove 211, the union cylinder 25 needs to resist the air pressure when moving. Under the action of the air pressure and the elasticity of the first spring 27, the vibration effect transmitted from the connecting plate 22 to the top plate 21 can be reduced, which is convenient for use.

[0059] The connecting component 2 further includes a limiting cover 26. Among them, the limiting cover 26 is a limiting circular cover. The first spring 27 is located inside the limiting cover 26 and extends out of the limiting cover 26. The two ends of the first spring 27 are respectively fixedly connected to the wall of the limiting groove 211 and the movable joint cylinder 25. The first spring 27 abuts against the inner wall of the limiting cover 26.

[0060] With such a design, when the movable joint cylinder 25 rotates, the movable joint cylinder 25 can only drive the part of the first spring 27 extending out of the limiting cover 26 to rotate. Thus, by shortening the effective distance of the first spring 27, the elastic force applied to the movable joint cylinder 25 is increased when the movable joint cylinder 25 rotates. Furthermore, it can prevent the first spring 27 from being overly bent, resulting in a large offset of the inner tube 12, and improving the connection stability of the inner tube 12.

[0061] As Figures 3 to 5 As shown in FIGS. 11 and 12, as a preferred embodiment, it further includes a sealing plug 41, a second spring 42, and a locking bolt 43. Among them, the sealing plug 41 includes a column body 411. The column body 411 is inserted into the inside of the connecting pipe 31 and is in sealing fit with the inner wall of the connecting pipe 31. A top ventilation hole 4111 is opened at the top of the column body 411, and a side ventilation hole 4112 is opened on the peripheral side of the column body 411. The top ventilation hole 4111 is communicated with the side ventilation hole 4112. The air extraction pipe 33 is inserted into the inside of the connecting pipe 31 and is in sealing fit with the inner wall of the connecting pipe 31. The air extraction pipe 33 abuts against the top wall of the column body 411 and is communicated with the top ventilation hole 4111; the second spring 42 is arranged between the column body 411 and the outer tube 11 and is used to reset the insertion position of the column body 411; the locking bolt 43 is in threaded connection with the connecting pipe 31 and the column body 411 and is used to position the column body 411.

[0062] By providing the sealing plug 41 to block the connecting pipe 31, when connecting the air extraction pipe 33 and the connecting pipe 31, the air extraction pipe 33 is inserted into the inside of the connecting pipe 31. At this time, the air extraction pipe 33 presses the column body 411 downward, and the column body 411 slides downward along the connecting pipe 31 until the flange 34 on the air extraction pipe 33 is connected to the flange 34 on the connecting pipe 31. At this time, the side ventilation hole 4112 opened on the column body 411 is communicated with the inside of the vacuum chamber 13, and further the air extraction pipe 33 is communicated with the vacuum chamber 13. The gas in the vacuum chamber 13 is extracted through the air extraction pipe 33, so as to adjust the vacuum chamber 13 to a vacuum state. After adjusting the vacuum chamber 13 to a vacuum state, the air extraction pipe 33 is pulled out halfway. At this time, the air extraction pipe 33 is separated from the column body 411. The column body 411 is completely inserted into the connecting pipe 31 again under the action of the second spring 42. The insertion position of the column body 411 is locked by the locking bolt 43, thereby completing the rapid blocking treatment of the connecting pipe 31. After the blocking is completed, the air extraction pipe 33 can be taken out, so that the vacuum pump 32 can be removed from the outer tube 11, and thus the vacuum pump 32 can repeatedly perform vacuum pumping on multiple air ducts, which is convenient to use.

[0063] The sealing plug 41 further includes a cone 412, wherein the cone 412 is arranged below the cylinder 411. When the cylinder 411 slides, the cone 412 abuts against the top wall of the inner cavity of the outer tube 11, and both ends of the second spring 42 are fixedly connected to the cone 412 and the top wall of the inner cavity of the outer tube 11 respectively.

[0064] With such a design, the cone 412 abuts against the connecting pipe 31, thereby positioning the insertion position of the cylinder 411, which is convenient for use.

[0065] As Figures 3 to 6 As shown in FIGS. 13, as a preferred embodiment, it further includes an anemometer 5. Among them, a first assembly hole 111 is formed on the outer tube 11, a connection hole 121 aligned with the first assembly hole 111 is formed on the inner tube 12, the anemometer 5 is inserted into the first assembly hole 111 and the connection hole 121, and extends to the inner side of the inner tube 12 for monitoring the wind speed of the air flow flowing through the inner tube 12.

[0066] By arranging the anemometer 5 to extend into the inner tube 12, the anemometer 5 can continuously monitor the wind speed of the air flow in the inner tube 12.

[0067] Preferably, a first mounting side plate 51 is arranged on the anemometer 5. The first mounting side plate 51 is supported on the top of the outer tube 11, and the first mounting side plate 51 is fixedly connected to the outer tube 11 through bolts.

[0068] It further includes a sealing ring sleeve 61 and a connecting ring 62. Among them, the sealing ring sleeve 61 is arranged inside the connection hole 121, and an embedding groove 611 is formed on the inner side of the sealing ring sleeve 61. The connecting ring 62 is embedded inside the embedding groove 611. The sealing ring sleeve 61 is hermetically connected to the connecting ring 62 and the hole wall of the connection hole 121. The anemometer 5 is inserted inside the connecting ring 62; the distance between the inner cavity walls of the outer tube 11 in the height direction is W1, the distance between the cavity walls of the vacuum chamber 13 in the height direction is W2, the distance between the side wall of the connecting ring 62 and the hole wall of the connection hole 121 is W3, W1 / 11≤W2≤W1 / 9, and W2 / 15≤W3≤W2 / 12.

[0069] By arranging the anemometer 5 to pass through the inside of the connecting ring 62, and the connecting ring 62 is connected to the inner tube 12 through the sealing ring sleeve 61, in this way, when the anemometer 5 is specifically used, the anemometer 5 can deflect and move relative to the inner tube 12, and further the connecting plate 22 can move relative to the top plate 21, which is convenient for shock-absorbing connection of the inner tube 12 and convenient for use.

[0070] By restricting W1 / 11 ≤ W2 ≤ W1 / 9, while ensuring a good noise isolation effect in the vacuum chamber 13, it synchronously ensures that the inner tube 12 has sufficient inner cavity to transfer gas. By restricting W2 / 15 ≤ W3 ≤ W2 / 12, the inner tube 12 has a good vibration amplitude. At the same time, by setting W3 ≤ W2 / 12, the connecting ring 62 also has the function of vibration shielding, preventing technical problems such as abnormal connection of the connecting component 2 or damage to the pipeline connection state caused by excessive vibration amplitude of the inner tube 12.

[0071] It further includes a guiding ring 63. Among them, the guiding ring 63 is connected to the top of the connecting ring 62, and the inner side wall of the guiding ring 63 is an inclined side wall.

[0072] By setting the guiding ring 63, when the anemometer 5 is inserted into the inside of the connecting ring 62, the inclined inner wall of the guiding ring 63 can guide and position the insertion position of the anemometer 5, thus facilitating the insertion of the anemometer 5 into the inside of the connecting ring 62 and being convenient for use.

[0073] As Figures 1 to 3 shown, as a preferred embodiment, it further includes a mounting plate 71, a clamping plate 72 and a filter screen 73. Among them, a second assembly hole 112 is opened on the outer tube 11. The mounting plate 71 is fixedly connected to the clamping plate 72. The clamping plate 72 is inserted into the inside of the second assembly hole 112 and extends to the inner cavity bottom wall of the outer tube 11. The outer surface of the clamping plate 72 is hermetically attached to the inner wall of the outer tube 11. The length of the mounting plate 71 is greater than the length of the clamping plate 72; an annular groove 721 is opened on the inner side of the clamping plate 72. The filter screen 73 is inserted into the inside of the annular groove 721 and is hermetically connected to the clamping plate 72. The filter screen 73 is located on one side of the end of the inner tube 12.

[0074] With such a design, the filter screen 73 can filter the air flow passing through the inner tube 12 from one end of the inner tube 12, thereby improving the purity of the air flow transported by the inner tube 12.

[0075] Preferably, a second mounting side plate 711 is provided on the mounting plate 71. The second mounting side plate 711 supports on the top of the outer tube 11, and the second mounting side plate 711 is fixedly connected to the outer tube 11 through bolts.

[0076] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. An air duct device having a sandwich inner wall, characterized in that: The invention comprises an outer tube (11), an inner tube (12), a connecting component (2) and a vacuum pump (32); the inner tube (12) is connected to the inner side of the outer tube (11) through the connecting component (2); the inner tube (12) is used for gas circulation; a vacuum chamber (13) is formed between the inner tube (12), the outer tube (11) and the connecting component (2); the connecting component (2) comprises a top plate (21), a connecting plate (22), a first sealing sleeve (23) and a second sealing sleeve (24); wherein: A top plate (21) is arranged on the top wall of the inner cavity of the outer tube (11), and the connecting plate (22) is movably connected to the top plate (21), and the connecting plate (22) is fixedly connected to the inner tube (12); A first sealing sleeve (23) is arranged between the top plate (21) and the connecting plate (22) and is used to seal and cover the connection between the top plate (21) and the connecting plate (22); A second sealing sleeve (24) is arranged between the top plate (21) and the inner side wall of the outer tube (11), and is fixedly connected to the outer surface of the inner tube (12); the second sealing sleeve (24) is sealed and fitted with the top plate (21), the outer tube (11) and the inner tube (12); The outer tube (11) is connected to a connecting tube (31) connected to the vacuum chamber (13); the air inlet end of the vacuum pump (32) is connected to an exhaust pipe (33); the exhaust pipe (33) is connected to the connecting tube (31); and the exhaust pipe (33) is connected to the connecting tube (31) via a flange (34).

2. The air duct device with a sandwich inner wall according to claim 1, characterized in that: The outer tube (11) and the inner tube (12) are both square tubes.

3. The air duct device with a sandwich inner wall as claimed in claim 2, characterized in that: The connecting component (2) further comprises a movable cylinder (25) and a first spring (27), wherein: A limiting groove (211) is provided on the top plate (21), the movable cylinder (25) is fixedly connected to one end of the connecting plate (22) away from the inner tube (12), and the end wall of the movable cylinder (25) is aligned with the end wall of the top plate (21) in the vertical direction, the movable cylinder (25) is inserted into the inner side of the limiting groove (211), and the limiting groove (211) is used to limit the movable cylinder (25) from sliding up and down and rotating in the top plate (21); A first spring (27) is arranged between the articulated cylinder (25) and the top plate (21) and is used to reset the moving position of the articulated cylinder (25).

4. The air duct device with a sandwich inner wall as claimed in claim 3, characterized in that: The connecting component (2) further comprises a limiting cover (26), wherein: The limiting cover (26) is a limiting circular cover, the first spring (27) is located inside the limiting cover (26) and extends out of the limiting cover (26), the two ends of the first spring (27) are respectively fixedly connected to the groove wall of the limiting groove (211) and the movable cylinder (25), and the first spring (27) is in conflict with the inner wall of the limiting cover (26).

5. The air duct device with a sandwich inner wall as claimed in claim 2, characterized in that: It also includes a sealing plug (41), a second spring (42) and a locking bolt (43), wherein: The sealing plug (41) comprises a column (411), the column (411) is inserted into the interior of the connecting tube (31) and is sealed and fitted with the inner wall of the connecting tube (31), a top vent hole (4111) is provided at the top of the column (411), a side vent hole (4112) is provided on the circumference of the column (411), the top vent hole (4111) is communicated with the side vent hole (4112), the exhaust pipe (33) is inserted into the interior of the connecting tube (31) and is sealed and fitted with the inner wall of the connecting tube (31), the exhaust pipe (33) is in contact with the top wall of the column (411) and is communicated with the top vent hole (4111); a second spring (42), arranged between the column (411) and the outer tube (11), and used for resetting the plugging position of the column (411); A locking bolt (43) is threadedly connected to the connecting pipe (31) and the column (411) and is used to locate the position of the column (411).

6. The air duct device with a sandwich inner wall as claimed in claim 5, characterized in that: The sealing plug (41) further comprises a cone (412), wherein: The cone (412) is arranged below the column (411). When the column (411) slides, the cone (412) contacts the top wall of the inner cavity of the outer tube (11). The two ends of the second spring (42) are respectively fixedly connected to the cone (412) and the top wall of the inner cavity of the outer tube (11).

7. The air duct device with a sandwich inner wall as claimed in claim 2, characterized in that: Also included is a wind meter (5), wherein: The outer tube (11) is provided with a first assembly hole (111), the inner tube (12) is provided with a connection hole (121) aligned with the first assembly hole (111), the anemometer (5) is plugged into the first assembly hole (111) and the connection hole (121), and extends to the inner side of the inner tube (12), so as to monitor the wind speed of the airflow flowing through the inner tube (12).

8. The air duct device with a sandwich inner wall as claimed in claim 7, characterized in that: It also includes a sealing ring sleeve (61) and a connecting ring (62), wherein: A sealing ring sleeve (61) is arranged inside the connecting hole (121), and an embedding groove (611) is provided on the inner side of the sealing ring sleeve (61), the connecting ring (62) is embedded in the inner side of the embedding groove (611), the sealing ring sleeve (61) is sealedly connected with the connecting ring (62) and the hole wall of the connecting hole (121), and the anemometer (5) is plugged into the inner side of the connecting ring (62). The spacing between the inner cavity walls of the outer tube (11) in the height direction is W1, the spacing between the cavity walls of the vacuum cavity (13) in the height direction is W2, the spacing between the side wall of the connecting ring (62) and the hole wall of the connecting hole (121) is W3, W1 / 11≤W2≤W1 / 9, and W2 / 15≤W3≤W2 / 12.

9. The air duct device with a sandwich inner wall as claimed in claim 8, characterized in that: Also included is a guide ring (63), wherein: The guide ring (63) is connected to the top of the connecting ring (62), and the inner side wall of the guide ring (63) is an inclined side wall.

10. The air duct device with a sandwich inner wall as claimed in claim 2, characterized in that: It also includes a mounting plate (71), a clamping plate (72) and a filter screen (73), wherein: The outer tube (11) is provided with a second assembly hole (112), the mounting plate (71) is fixedly connected to the clamping plate (72), the clamping plate (72) is inserted into the second assembly hole (112) and extends to the bottom wall of the inner cavity of the outer tube (11), the outer surface of the clamping plate (72) is sealed and fitted with the inner wall of the outer tube (11), and the length of the mounting plate (71) is greater than the length of the clamping plate (72); An annular groove (721) is provided on the inner side of the clamping plate (72), the filter screen (73) is inserted into the inner side of the annular groove (721) and is sealed to the clamping plate (72), and the filter screen (73) is located at one end side of the inner tube (12).

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