Sealing end cover structure for cooler
By setting a sealing partition and sealing strips on the end cover sealing part of the cooler, the problem of high-speed flow of the cooling medium causes the displacement or fall off of the sealing strips, and the efficient sealing and stable operation of the cooler are achieved.
Patent Information
- Application Number
- CN202421986276.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-15
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-08-15
AI Technical Summary
The end cap sealing strips of existing coolers are prone to displacement or fall off when the cooling medium flows at high speed, resulting in reduced cooling efficiency and leakage problems.
A sealed end cap structure for coolers is designed, by providing first and second sealing partitions at the front and rear sealing portions, and tightly fitting with these partitions with sealing tapes, to avoid erosion of the cooling medium.
Effectively prevent the displacement and fall of the sealing strip, ensure the cooling efficiency of the cooler and the sealing of the overall structure, and avoid leakage of the cooling medium.
Smart Images
Figure CN223035662U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of coolers, and particularly to a sealing end cover structure for a cooler. Background Art
[0002] In the technical field of coolers, a cooler with a model number of QDKR-180-090 is composed of a main body and components such as a matching end cover. Due to the specific structural design of this cooler, the sealing rubber strip on the end cover of the cooler in the prior art presses on the cooling water channel of the cooler. When the cooler is working, the cooling medium flows at a high speed in the cooling water channel. During the long-term operation process, this high-speed flowing cooling medium will continuously scour the sealing rubber strip pressing on the cooling water channel, resulting in the displacement of the sealing rubber strip and even its detachment from its original installation position. The displacement and detachment of the sealing rubber strip will lead to a decrease in the cooling efficiency of the cooler and leakage, affecting the normal operation and performance of the cooler.
[0003] Therefore, how to avoid the cooling medium in the cooling water channel from scouring the sealing rubber strip on the end cover has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention
[0004] In view of this, this application proposes a sealing end cover structure for a cooler, including: a front end cover and a rear end cover;
[0005] The front end cover includes: a front fixing part and a front sealing part, and the front fixing part is arranged on the outer side wall of the front sealing part; the rear end cover includes: a rear fixing part and a rear sealing part, and the rear fixing part is arranged on the outer side wall of the rear sealing part;
[0006] The cooler is provided with more than two coolant channels. The main bodies of the front sealing part and the rear sealing part are both rectangular shells with one end open; and the open ends of the front sealing part and the rear sealing part are respectively buckled at the coolant channels on both sides of the cooler. The front sealing part and the rear sealing part are respectively adapted to be connected to both sides of the cooler through the front fixing part and the rear fixing part; both ends of more than two coolant channels are respectively communicated with the front sealing part and the rear sealing part;
[0007] A first sealing partition is provided on the side of the front sealing part facing the front end of the cooler. There is a first angle between the length direction of the first sealing partition and the length direction of the front sealing part, and the first angle is 60 degrees; two second sealing partitions are provided on the side of the rear sealing part facing the rear end of the cooler. There is a second angle between the length direction of each of the two second sealing partitions and the length direction of the rear sealing part, and the second angle is 60 degrees;
[0008] A sealing rubber strip is provided on the side of the first sealing partition plate facing the cooler, and sealing rubber strips are also provided on the sides of the two second sealing partition plates facing the cooler, and when the current front end cover and the rear end cover are installed on the cooler, the sealing rubber strips are closely attached to the cooler.
[0009] In a possible implementation manner, the main bodies of the front fixing part and the rear fixing part are both in a plate-like structure and are respectively arranged around the outer side walls of the front sealing part and the rear sealing part.
[0010] In a possible implementation manner, the front fixing part and the rear fixing part are both provided with more than two fixing holes; the more than two fixing holes are sequentially arranged along the annular structures of the front fixing part and the rear fixing part respectively.
[0011] In a possible implementation manner, there are sixteen fixing holes respectively on the front fixing part and the rear fixing part.
[0012] In a possible implementation manner, the rear sealing part is provided with two connecting flange holes; the two flange holes are respectively communicated with the cavity of the rear sealing part.
[0013] In a possible implementation manner, a flange plate is provided on one side of the rear sealing part, and the flange plate is communicated with the cavity of the rear sealing part through the connecting flange holes.
[0014] In a possible implementation manner, the body length directions of the two second sealing partition plates are parallel to each other.
[0015] Advantages of the present application
[0016] By setting the first angle a and the second angle b, and the first angle a and the second angle b are both the same as the angle of the included angle c, so that the first sealing partition plate, the second sealing partition plate and the sealing rubber strip do not cover any of the coolant channels, avoiding the sealing rubber strip on the first sealing partition plate and the second sealing partition plate from being washed by the cooling medium in the coolant channel, resulting in displacement or falling off of the sealing rubber strip, preventing leakage of the cooling medium, and ensuring the cooling efficiency of the cooler and the sealing performance of the overall structure.
[0017] According to the following detailed description of the exemplary embodiments with reference to the accompanying drawings, other features and aspects of the present application will become clear. Brief Description of the Drawings
[0018] The drawings included in the specification and constituting a part of the specification show the exemplary embodiments, features and aspects of the present application together with the specification, and are used to explain the principles of the present application.
[0019] Figure 1 A front view showing the front end cover of the present application;
[0020] Figure 2Shows the front view of the rear end cover of the present application;
[0021] Figure 3 Shows the front view of the front end cover of the present application;
[0022] Figure 4 Shows the front view of the rear end cover of the present application;
[0023] Figure 5 Shows the partial enlarged view on both sides of the cooler of the present application;
[0024] Figure 6 Shows the top view of the cooler of the present application;
[0025] Figure 7 Shows the schematic diagram of the main structure of the sealing strip of the present application;
[0026] Figure 8 Shows the side view of the rear end cover of the present application;
[0027] Figure 9 Shows the side view of the front end cover of the present application. Detailed Description of the Preferred Embodiments
[0028] Hereinafter, various exemplary embodiments, features, and aspects of the present application will be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements having the same or similar functions. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise specified.
[0029] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention or simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.
[0030] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.
[0031] As used herein, the term "exemplary" means "serving as an example, embodiment, or illustration". Any embodiment described as "exemplary" herein need not be construed as superior or better than other embodiments.
[0032] In addition, for a better illustration of the present application, numerous specific details are given in the following detailed description. Those skilled in the art should understand that the present application can be implemented without some of these specific details. In some instances, methods, means, elements, and circuits well-known to those skilled in the art are not described in detail so as to highlight the gist of the present application.
[0033] Figure 1 Showing a front view of the front end cover of the present application; Figure 2 Showing a front view of the rear end cover of the present application; Figure 3 Showing a front view of the front end cover of the present application; Figure 4 Showing a front view of the rear end cover of the present application; Figure 5 Showing a partial enlarged view of both sides of the cooler of the present application; Figure 6 Showing a top view of the cooler of the present application;
[0034] Figure 7 Showing a side view of the rear end cover of the present application. The present application provides a sealed end cover structure for a cooler 100, as Figures 1 to 7As shown in the figure, it includes: a front end cover 200 and a rear end cover 300; the front end cover 200 includes: a front fixing part 210 and a front sealing part 220, and the front fixing part 210 is arranged on the outer side wall of the front sealing part 220; the rear end cover 300 includes: a rear fixing part 310 and a rear sealing part 320, and the rear fixing part 310 is arranged on the outer side wall of the rear sealing part 320; the cooler 100 is provided with more than two coolant channels 110. The main bodies of the front sealing part 220 and the rear sealing part 320 are both rectangular shells with one end open, and the open ends of the front sealing part 220 and the rear sealing part 320 are respectively buckled at the coolant channels 110 on both sides of the cooler 100. The front sealing part 220 and the rear sealing part 320 are suitable for being connected to both sides of the cooler 100 through the front fixing part 210 and the rear fixing part 310 respectively; both ends of the more than two coolant channels 110 are respectively communicated with the front sealing part 220 and the rear sealing part 320. On the side of the front sealing part 220 facing the front end of the cooler 100, there is a first sealing partition 410. There is a first angle a between the length direction of the first sealing partition 410 and the length direction of the front sealing part 220, and the first angle a is 60 degrees; on the side of the rear sealing part 320 facing the rear end of the cooler 100, there are two second sealing partitions 420. There is a second angle b between the length direction of both second sealing partitions 420 and the length direction of the rear sealing part 320, and the second angle b is 60 degrees; on the side of the first sealing partition 410 facing the cooler 100, there is a sealing strip 430, and on the side of the two second sealing partitions 420 facing the cooler 100, there is also a sealing strip 430, and when the front end cover 200 and the rear end cover 300 are installed on the cooler 100, the sealing strip 430 is tightly attached to the cooler 100.
[0035] It should be noted here that the model of the cooler 100 adapted and installed in this application is the cooler of QDKR-180-090 in the prior art. For the arrangement of the coolant channels 110 of this model of cooler 100, the sealing end cover structure of this application is specially designed. As Figure 5 、 Figure 6As shown, the cooler 100 is provided with more than two coolant channels 110, and the more than two coolant channels 110 penetrate through the opposite sides of the cooler 100. The more than two coolant channels 110 are arranged in an array on the cooler 100, and the length directions of the more than two coolant channels 110 are parallel to each other. The coolant channels 110 of the cooler 100 are provided with four rows, and adjacent rows are staggeredly distributed to achieve the maximum cooling effect. Specifically, the coolant channels 110 in each row are arranged at equal intervals along the width direction of the cooler 100. Among them, the first row of coolant channels 110 and the third row of coolant channels 110 are parallel and symmetrically arranged, the second row of coolant channels 110 and the fourth row of coolant channels 110 are parallel and symmetrically arranged, the first row of coolant channels 110 and the second row of coolant channels 110 are parallel and staggeredly arranged, and so on. As Figure 5 shown, for the two adjacent coolant channels 110 in each upper and lower pair of coolant channels 110, the included angle c between the connecting line of the centers of the two coolant channels 110 and the straight line where the centers of the coolant channels 110 in each row are located is 60 degrees, that is, the stagger distance of each row relative to the upper row is the same.
[0036] The open ends of the front end seal 220 and the rear end seal 320 are respectively buckled at the coolant channels 110 on both sides of the cooler 100. The front end seal 220 and the rear end seal 320 are both suitable for blocking the cold liquid channels of the cooler 100. The rear end seal 320 is provided with two connecting flange holes 321, and the two connecting flange holes 321 communicate with the cavity of the rear end seal 320. The two connecting flange holes 321 are suitable for distributing and collecting the cooling medium. The front end seal 220 and the rear end seal 320 are suitable for being detachably installed on both sides of the cooler 100 through the front fixing part 210 and the rear fixing part 310 respectively; the designs of the front cover 200 and the rear cover 300 not only facilitate installation and maintenance, but also ensure the overall structural strength of the cooler 100. The coolant channels 110 of the cooler 100 are suitable for increasing the flow path length and turbulence degree of the cooling medium in the cooler 100, thereby improving the heat exchange efficiency. When the cooling medium passes through these staggered channels, it will continuously change the flow direction, increasing the contact area and time with the wall surface of the cooler 100, thereby more effectively transferring heat.
[0037] The first sealing partition plate 410 is fixedly arranged in the cavity of the front-end sealing part 220. The first sealing partition plate 410 divides the cavity of the front-end sealing part 220 into a first folding chamber and a second folding chamber, which is suitable for changing the flow direction of the cooling medium in the coolant channel 110. Two second sealing partition plates 420 are fixedly arranged in the cavity of the rear-end sealing part 320, and the longitudinal directions of the two second sealing partition plates 420 are parallel to each other. The two second sealing partition plates 420 divide the cavity of the rear-end sealing part 320 into a liquid inlet chamber, a liquid outlet chamber and a third folding chamber. The liquid inlet chamber and the liquid outlet chamber are respectively located on both sides of the third folding chamber. Two connecting flange holes 321 are respectively communicated with the liquid inlet chamber and the liquid outlet chamber. The cooling medium enters the liquid inlet chamber through the connecting flange hole 321 and then flows into the coolant channel 110. The cooling medium in the coolant channel 110 changes its direction in sequence through the first folding chamber, the third folding chamber and the second folding chamber during the flowing process, thus forming a folding flow, and finally is discharged from the liquid outlet chamber. By arranging the first sealing partition plate 410 inside the cavity of the front-end sealing part 220 and arranging two second sealing partition plates 420 inside the cavity of the rear-end sealing part 320, all the coolant channels 110 are communicated with each other and form an S-shaped channel, so as to guide the cooling medium to flow along a certain path inside the cooler 100. The flowing path of the cooling medium in the cooler 100 is effectively extended, the contact time and area between the cooling medium and the wall surface of the cooler 100 are increased, the heat can be absorbed and carried away more fully, and the heat exchange efficiency is improved.
[0038] As Figure 7 shown, the main body of the sealing rubber strip 430 is in a strip-shaped structure. The length of the sealing rubber strip 430 is the same as that of the first sealing partition plate 410 and the second sealing partition plate 420. The width of the sealing rubber strip 430 is smaller than the distance between two adjacent coolant channels 110. A groove 431 is formed on one side of the sealing rubber strip 430. The groove 431 is arranged along the longitudinal direction of the sealing rubber strip 430. The groove 431 matches the thickness of the first sealing partition plate 410 and the second sealing partition plate 420. One side of the sealing rubber strip 430 is respectively buckled on one side of the first sealing partition plate 410 and the two second sealing partition plates 420 through the groove 431, and the side edge of the first sealing partition plate 410 is embedded in the groove 431 of the sealing rubber strip 430. Similarly, the side edge of the second sealing partition plate 420 is also embedded in the groove 431 of the sealing rubber strip 430. When the front end cover 200 and the rear end cover 300 are installed on the cooler 100, the sealing rubber strip 430 is closely attached to the cooler 100. By arranging the sealing rubber strip 430, the communication between adjacent chambers is avoided, and the flow direction of the cooling medium is ensured.
[0039] As Figure 1 shown, the first angle a between the longitudinal direction of the first sealing partition plate 410 and the longitudinal direction of the front-end sealing part 220 is 60 degrees; AsFigure 2 As shown, the second angle b between the longitudinal directions of the two second sealing partitions 420 and the longitudinal direction of the rear end sealing portion 320 is 60 degrees. The first angle a and the second angle b are the same as the angle c. Moreover, the first sealing partition 410 and the second sealing partitions 420 are located between two adjacent coolant channels 110 in each row of coolant channels 110, so that neither the first sealing partition 410, the second sealing partitions 420 nor the sealing rubber strips 430 cover any of the coolant channels 110. This avoids the erosion of the sealing rubber strips 430 on the first sealing partition 410 and the second sealing partitions 420 by the cooling medium in the coolant channels 110, which may cause the displacement or detachment of the sealing rubber strips 430, prevents the leakage of the cooling medium, and ensures the cooling efficiency of the cooler 100 and the sealing performance of the overall structure.
[0040] The main bodies of the front end sealing portion 220 and the rear end sealing portion 320 are both rectangular shells with one end open. The structure of the rectangular shell has good structural strength, thus ensuring that the front end sealing portion 220 and the rear end sealing portion 320 can withstand various forces and vibrations during the operation of the cooler 100 and ensuring the pressure stability inside the cooling system. Among them, as Figure 3 、 Figure 4 shown, the length h1 of the front end sealing portion 220 and the rear end sealing portion 320 is: 900 mm, and the width h2 of the front end sealing portion 220 and the rear end sealing portion 320 is: 250 mm.
[0041] Furthermore, as Figure 3 、 Figure 4 shown, a preset distance h3 is provided between the first sealing partition 410 and the side of the front end sealing portion 220, and the value of the preset distance h3 is: 200 mm. Preset distances h4 are provided between the two second sealing partitions 420 and the sides of the rear end sealing portion 320, and the value of the preset distance h4 is: 150 mm.
[0042] In a possible implementation, the main bodies of the front fixing part 210 and the rear fixing part 310 are both in a plate-like structure and are respectively arranged around the outer side walls of the front sealing part 220 and the rear sealing part 320. It should be noted here that the front fixing part 210 and the front sealing part 220 are integrally formed. Similarly, the rear fixing part 310 and the rear sealing part 320 are integrally formed. On the sides of the front fixing part 210 and the rear fixing part 310 connected to the cooler, sealing rubber strips 430 are provided, and the shape of the sealing rubber strips 430 is the same as that of the front fixing part 210 and the rear fixing part 310. Among them, the sealing rubber strips 430 are respectively fixed to the front fixing part 210 and connected to the rear fixing part 310 in a bonding manner. By setting the sealing rubber strips 430, it is ensured that the contact surfaces between the front cover 200, the rear cover 300 and the cooler 100 achieve a good sealing effect, preventing the cooling medium from leaking during the operation of the cooler 100, ensuring the pressure stability inside the cooler 100, improving the cooling efficiency, and reducing the energy consumption.
[0043] In a possible implementation, as Figures 1 to 5 shown, the front fixing part 210 and the rear fixing part 310 are both provided with more than two fixing holes 221; the more than two fixing holes 221 are sequentially arranged along the annular structures of the front fixing part 210 and the rear fixing part 310. It should be noted here that there are also more than two fixing bolt assemblies matching the fixing holes 221. The fixing bolt assemblies are arranged on both sides of the cooler 100 and correspond to the fixing holes 221 one by one. The fixing bolt assemblies are suitable for fixedly installing the front cover 200 and the rear cover 300 on both sides of the cooler 100. Through the cooperation of the more than two fixing holes 221 and the more than two fixing bolt assemblies, multi-point connection can be formed. This multi-point fixing method can greatly increase the stability of the connection between the front cover 200 and the rear cover 300 and the cooler 100. The close cooperation of multiple bolt assemblies can form a more reliable sealing structure, reducing the risk of leakage of the cooling medium. At the same time, the fixing holes 221 arranged around the front fixing part 210 and the rear fixing part 310 ensure that each fixing bolt assembly can be evenly stressed when connecting. This helps to reduce the stress concentration phenomenon caused by uneven stress, thereby prolonging the service life of the condenser.
[0044] Furthermore, the fixing bolt assembly includes fixing bolts 440 and nuts (not shown in the figure). The fixing bolts 440 are arranged around the coolant channels 110 on both sides of the cooler 100. The fixing bolts 440 are arranged through the fixing holes 221. The nuts are sleeved on the fixing bolts 440 and tightly fit with the side of the front fixing portion 210 (or the rear fixing portion 310) away from the cooler 100. By tightening the nuts, the nuts are screwed in and out on the fixing bolts 440 to tightly press the front cover 200 and the rear cover 300 on the opening of the cooler 100. An effective seal is thus formed on both sides. Through the cooperation of the fixing bolts 440 and the nuts, the front cover 200 and the rear cover 300 can be firmly fixed on both sides of the cooler 100. This mechanical connection method can withstand greater tension and shear forces, thereby ensuring stability and safety during the operation of the cooler 100. At the same time, the design of the fixing bolts 440 and the nuts makes the installation and disassembly process simple and quick. When maintenance or replacement is required, the nuts can be easily loosened to separate the front cover 200 or the rear cover 300 without destroying the overall structure.
[0045] In a possible implementation, sixteen fixing holes 221 are respectively provided on the front fixing portion 210 and the rear fixing portion 310 .
[0046] In a possible implementation, a flange 322 is provided on one side of the rear end sealing portion 320, and the flange 322 is connected to the cavity of the rear end sealing portion 320 through the connecting flange holes 321. Figure 2 , Figure 6 , Figure 7 As shown, there are two flanges 322, and the main bodies of the two flanges 322 are both hollow structures with openings at both ends. The two flanges 322 are respectively fixedly mounted on the rear sealing part 320 through two connecting flange holes 321 and communicated with the liquid inlet chamber and the liquid outlet chamber of the rear fixing part 310. The two flanges 322 are respectively suitable for introducing the cooling medium into the liquid inlet chamber or discharging the cooling medium from the liquid outlet chamber. The circumferences of the two flanges 322 are provided with mounting holes, and the external pipeline is communicated with the flanges 322 through the mounting holes. After the cooling medium in the external pipeline flows into the liquid inlet chamber through one of the flanges 322, the cooling medium in the liquid inlet chamber flows into the cooling liquid channel 110 and contacts the wall surface of the cooler 100 to absorb and take away heat. After absorbing heat in the cooling liquid channel 110, the cooling medium enters the liquid outlet chamber and is discharged through the other flange 322. Among them, the two flanges 322 adopt the flanges of the prior art with the model: ANSIB16.5 150LB, 3 inches. Preferably, the flange 322 is connected to the rear end sealing portion 320 by welding.
[0047] The embodiments of the present application have been described above. The above description is exemplary and not exhaustive, and is also not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, the practical application, or the improvement of the technology in the market, or to enable other ordinary skill in the art to understand the embodiments disclosed herein.
Claims
1. A sealing end cover structure for a cooler, characterized in that: include: Front cover and rear cover; The front end cover comprises: a front end fixing portion and a front end sealing portion, wherein the front end fixing portion is arranged on the outer side wall of the front end sealing portion; the rear end cover comprises: a rear end fixing portion and a rear end sealing portion, wherein the rear end fixing portion is arranged on the outer side wall of the rear end sealing portion; The cooler is provided with more than two cooling liquid channels, and the main bodies of the front end sealing part and the rear end sealing part are both rectangular shells with one end open; and the open end of the front end sealing part and the open end of the rear end sealing part are respectively buckled at the cooling liquid channels on both sides of the cooler, and the front end sealing part and the rear end sealing part are suitable for being connected to the two sides of the cooler through the front end fixing part and the rear end fixing part respectively; Two or more cooling liquid channels are connected at both ends to the front end sealing portion and the rear end sealing portion respectively; A first sealing baffle is provided on one side of the front end sealing portion facing the front end of the cooler, and a first angle is provided between the length direction of the first sealing baffle and the length direction of the front end sealing portion, and the first angle is 60 degrees; Two second sealing baffles are provided on one side of the rear end sealing portion facing the rear end of the cooler, and a second angle is set between the length direction of the two second sealing baffles and the length direction of the rear end sealing portion, and the second angle is 60 degrees; The first sealing baffle is provided with a sealing strip on the side facing the cooler, and the two second sealing baffles are also provided with sealing strips on the side facing the cooler, and are suitable for the sealing strips to fit tightly with the cooler when the front cover and the rear cover are installed on the cooler.
2. The sealing end cover structure for a cooler according to claim 1, characterized in that: The main bodies of the front end fixing part and the rear end fixing part are both plate-shaped structures and are respectively arranged on the outer side walls of the front end sealing part and the rear end sealing part.
3. The sealing end cover structure for a cooler according to claim 2, characterized in that: The front end fixing portion and the rear end fixing portion are both provided with more than two fixing holes; The two or more fixing holes are arranged in sequence along the annular structures of the front end fixing portion and the rear end fixing portion respectively.
4. The sealing end cover structure for a cooler according to claim 3, characterized in that: There are sixteen fixing holes on the front end fixing portion and the rear end fixing portion respectively.
5. The sealing end cover structure for a cooler according to claim 1, characterized in that: The rear end sealing portion is provided with two connecting flange holes; The two flange holes are respectively communicated with the cavity of the rear end sealing part.
6. The sealing end cover structure for a cooler according to claim 5, characterized in that: A flange is provided on one side of the rear end sealing portion, and the flange is communicated with the cavity of the rear end sealing portion through the connecting flange hole.
7. The sealing end cover structure for a cooler according to claim 1, characterized in that: The length directions of the two second sealing baffles are parallel to each other.