A coaxial fluid guiding device

Abstract

The present invention relates to a coaxial fluid guiding and regulating device, comprising: a first shell, a second shell, a first flow regulator and a second flow regulator; the first shell is a hollow cone, a small diameter end of which has a first opening, and a large diameter end of which is provided with a first connecting port and a second connecting port; the second shell is an axisymmetric hollow structure, one end of which is a shell fixed end fixedly connected to the bottom of the first shell, and the other end is a shell docking end; the first shell and the second shell form a first installation cavity for installing the second flow regulator, and the first connecting port is communicated with the first installation cavity; the hollow part of the second shell constitutes a second installation cavity for installing the first flow regulator; the shell docking end of the second shell is provided with a second opening, and the shell fixed end is provided with a third opening, and the third opening is communicated with the second connecting port; the shell docking end of the second shell and the small diameter end of the first shell constitute an output docking port connected to the first installation cavity.

Description

Technical Field

[0001] The invention relates to the field of fluid diversion, and in particular to a coaxial fluid diversion and adjustment device. Background Art

[0002] Torpedoes are one of the main underwater offensive and defensive weapons with the advantages of strong striking power, good concealment, high hit rate, and strong anti-interference ability. With the development of ship offensive and defensive technology, the research on ultra-high-speed torpedoes with high speed and long range has become a current research hotspot.

[0003] In order to meet the needs of super-high-speed torpedoes for thrust systems, a new type of power system has emerged in recent years - the water ramjet engine. When the water ramjet engine is working, water is introduced into the combustion chamber through the water inlet. In the combustion chamber, the water will react with the metal fuel carried by the engine itself, and the high-temperature and high-pressure gas produced will enter the engine nozzle to generate thrust. The advantage of using water as an oxidant is that the engine does not need to carry the oxidant itself, so that the engine can carry more fuel and generate a higher specific impulse.

[0004] In addition, when the torpedo is running at super-high speed, the seawater near the wall will produce supercavitation, that is, the fluid near the wall of the navigation body changes from water to gas. Since the density of gas is much smaller than that of water, the navigation resistance of the torpedo is greatly reduced, and it can maintain a high-speed navigation state in the water. Supercavitation technology is also an important technical means for underwater vehicles to increase speed and range. In order to ensure that the supercavitation on the surface of the torpedo can be stably generated and cover the entire torpedo body, artificial ventilation is often performed on the head of the torpedo to achieve supercavitation technology.

[0005] Water ramjets generally capture seawater through the cavitator in the torpedo head and guide it to the combustion chamber through the water inlet pipe system. The cavitation gas required for cavitation will also be transported to the torpedo head. Therefore, in the head of the torpedo, there are at least two types of fluid guidance (guidance and quality control) issues involved: seawater as an oxidizer for combustion and gas as cavitation gas for generating supercavitation.

[0006] The existing seawater guidance and control devices and cavitation gas guidance and control devices used in torpedoes are separated in space layout, resulting in low space utilization in the torpedo body. Since the common water inlet main line is often arranged at the axial position of the torpedo body, the layout of other torpedo devices is limited. For example, the device that generates cavitation gas can only be placed on one side of the torpedo body, which increases the burden of uniformly discharging cavitation gas along the circumference of the torpedo body. Summary of the invention

[0007] The object of the present invention is to provide a coaxial fluid guiding and regulating device.

[0008] To achieve the above-mentioned object of the invention, the present invention provides a coaxial fluid guiding and regulating device, comprising: a first housing, a second housing, a first flow regulator and a second flow regulator;

[0009] The first shell is in the shape of a hollow cone as a whole, with a first opening at its small diameter end and a first connection port and a second connection port at its large diameter end;

[0010] The second shell is an axisymmetric hollow structure, which is coaxially arranged inside the first shell with the first shell, one end of which is a shell fixing end fixedly connected to the bottom of the first shell, and the other end is a shell docking end;

[0011] The first shell and the second shell form a first installation cavity for installing the second flow regulator, and the first connecting port is in communication with the first installation cavity;

[0012] The hollow portion of the second shell constitutes a second installation cavity for installing the first flow regulator;

[0013] The second shell has a second opening for inputting fluid at its shell docking end, and a third opening at its shell fixing end, and the third opening is in communication with the second connecting port;

[0014] An output docking port communicating with the first installation cavity and outputting fluid is formed between the shell docking end of the second shell and the small-diameter end of the first shell.

[0015] According to one aspect of the present invention, the end of the shell butt end is flush with the end of the small diameter end of the first shell, or the end of the shell butt end exceeds the end of the small diameter end of the first shell.

[0016] According to one aspect of the present invention, the second housing comprises: a conical cylinder section and a cylindrical cylinder section arranged coaxially;

[0017] The large diameter end of the conical cylinder section is fixedly connected to the cylindrical section, and the small diameter end thereof constitutes the shell butt end of the second shell;

[0018] The third opening is arranged on the side wall of the cylindrical section away from the conical cylindrical section;

[0019] The first flow regulator is coaxially arranged in the cylindrical section.

[0020] According to one aspect of the present invention, the first flow regulator is in a cylindrical structure as a whole, and a first channel is provided at the center thereof;

[0021] Along the axial direction of the cylindrical section, the first flow regulator and the two opposite ends of the cylindrical section are spaced apart from each other.

[0022] According to one aspect of the present invention, the second flow regulator is annular in structure as a whole, and a plurality of second channels are arranged at intervals along its circumference;

[0023] The second flow regulator is coaxially sleeved on the outer side of the cylindrical section with the second shell, and the radial outer side surface of the second flow regulator is in contact with the inner side surface of the first shell.

[0024] According to one aspect of the present invention, a flow dividing structure is provided in the first shell;

[0025] The diversion structure includes: a baffle and a side plate;

[0026] The baffle is an annular plate, which is sleeved on the outer surface of the cylindrical section through a hollow portion, and its radial outer side surface is connected to the inner side wall of the first shell;

[0027] The side plate is located between the baffle plate and the bottom plate of the large diameter end of the first shell, and is used to divide a rear liquid accumulation cavity connecting the third opening and the second connecting port and a rear gas collecting cavity connecting the first installation cavity and the first connecting port;

[0028] An opening is provided at a position of the baffle corresponding to the rear gas collecting cavity.

[0029] According to one aspect of the present invention, along the axial direction of the first shell, opposite ends of the side plate are respectively connected to the baffle plate and the bottom plate of the large diameter end of the first shell;

[0030] Along the radial direction of the first shell, opposite ends of the side plate are respectively connected to the outer side wall of the cylindrical section and the inner side wall of the first shell;

[0031] A plurality of side plates are arranged at equal intervals along the circumference of the first shell.

[0032] According to one aspect of the present invention, the first flow regulator is a water flow regulator;

[0033] The second flow controller is a cavitation gas flow controller.

[0034] According to one scheme of the present invention, the present invention adopts a conical shape design, which can be easily adapted to the projectile head of a torpedo or a cross-medium aircraft, and can be easily installed inside the projectile head, fully meeting the streamlined design requirements of a torpedo or a cross-medium aircraft.

[0035] According to one scheme of the present invention, the present invention adopts a coaxially arranged shell to construct two coaxial cavities, which can realize the guidance and adjustment tasks of seawater and cavitation gas in the same device, reduce the complexity of the internal structure of the torpedo or the cross-medium aircraft, improve the reliability of the operation of the torpedo or the cross-medium aircraft, and effectively improve the space utilization of the projectile.

[0036] According to one solution of the present invention, the present invention adopts a coaxial structural design, which effectively realizes the uniform distribution of the fluid in the circumferential direction and ensures the overall balance.

[0037] According to one scheme of the present invention, the present invention realizes efficient guidance and adjustment of seawater and cavitation, and has the ability to realize the guidance and adjustment of seawater and cavitation at the same time, providing a new idea for fluid guidance and adjustment in a new generation of ultra-high-speed torpedoes or cross-medium aircraft. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a perspective view schematically showing a coaxial fluid guiding and regulating device according to an embodiment of the present invention;

[0039] Figure 2 is a structural diagram schematically showing a coaxial fluid guiding and regulating device according to an embodiment of the present invention;

[0040] Figure 3 is a cross-sectional view schematically showing a coaxial fluid guiding and regulating device according to an embodiment of the present invention;

[0041] Figure 4 It is a schematic representation Figure 3 Cross-section view along the AA direction;

[0042] Figure 5 It is a schematic representation Figure 3 Cross-section along the BB direction;

[0043] Figure 6 It is a schematic representation Figure 3 Cross-sectional view in the CC direction;

[0044] Figure 7 It is a schematic representation Figure 3 Cross-sectional view along the DD direction. DETAILED DESCRIPTION

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0046] When describing the embodiments of the present invention, the orientation or positional relationship expressed by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or positional relationship shown in the relevant drawings and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0047] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the embodiments of the present invention are not therefore limited to the following embodiments.

[0048] Combination Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, according to one embodiment of the present invention, a coaxial fluid guiding device of the present invention is used to regulate the flow of cavitation gas and water in real time according to the navigation conditions, which specifically includes: a first shell 1, a second shell 2, a first flow regulator 3 and a second flow regulator 4. In this embodiment, the first shell 1 is a hollow cone as a whole, and its small diameter end has a first opening 1a, and its large diameter end is provided with a bottom plate closure, but a first connection port 1b and a second connection port 1c are provided on the bottom plate at intervals. In this embodiment, the second shell 2 is an axisymmetric hollow structure, which is coaxially arranged in the first shell 1 with the first shell 1, one end of which is a shell fixed end fixedly connected to the bottom plate of the first shell 1, and the other end is a shell docking end. In this embodiment, the first flow regulator 3 is a water flow regulator; the second flow regulator 4 is a cavitation gas flow regulator.

[0049] In this embodiment, the first shell 1 and the second shell 2 form a first installation cavity for installing the second flow regulator 4 ; the hollow portion of the second shell 2 constitutes a second installation cavity for installing the first flow regulator 3 .

[0050] In this embodiment, the shell butt end of the second shell 2 is provided with a second opening 2a for connection to an external water inlet structure. In this embodiment, the end of the shell butt end of the second shell 2 is flush with the end of the small diameter end of the first shell 1, or the end of the shell butt end of the second shell 2 exceeds the end of the small diameter end of the first shell 1. Through the above arrangement, it is convenient to connect with the external structure, and it is also conducive to ensuring the isolation of the first installation cavity and the second installation cavity.

[0051] In this embodiment, a third opening 2b is provided at the fixed end of the second shell 2 for connecting the second installation cavity and the second connection port 1c.

[0052] In this embodiment, the outer diameter of the shell docking end of the second shell 2 is smaller than the diameter of the first opening 1a, and thus an annular space can be formed between the outer side surface of the shell docking end of the second shell 2 and the inner side surface of the small diameter end of the first shell 1, and the annular space can constitute an output docking port connected to the first installation cavity. In this embodiment, the first installation cavity is connected to the first connection port 1b, so as to realize the gas flow from the first connection port 1b to the output docking port.

[0053] In this embodiment, the second shell 2 includes: a coaxially arranged conical cylinder section 21 and a cylindrical section 22, wherein the shell butt end of the second shell 2 is arranged at the small diameter end of the conical cylinder section 21, and the end of the cylindrical section 22 away from the conical cylinder section 21 constitutes the shell fixed end of the second shell 2. In this embodiment, the radial dimension of the large diameter end of the conical cylinder section 21 is greater than the radial dimension of the cylindrical section 22. In this embodiment, the third opening 2b is arranged on the side wall of the cylindrical section 22 away from the conical cylinder section 21.

[0054] In the present embodiment, the first flow regulator 3 is coaxially arranged on the inner side of the cylindrical section 22 with the cylindrical section 22, and the second flow regulator 4 is coaxially arranged on the outer side of the cylindrical section 22 with the cylindrical section 22. In the present embodiment, the first flow regulator 3 is a cylindrical structure as a whole, and a first channel is arranged at its center. In the present embodiment, the first flow regulator 3 is used to adjust the water inlet flow rate and pressurize the water flow at the same time to ensure that the water flow can be output from the rear. In the present embodiment, the first flow regulator 3 realizes flow control by controlling the minimum cross-sectional area of ​​the first channel at the center position. For example, movable blades are provided to realize the size control of the cross section of the first channel.

[0055] In this embodiment, along the axial direction of the cylindrical section 22 , the first flow regulator 3 and the two opposite ends of the cylindrical section 22 are spaced apart from each other.

[0056] Through the above-mentioned arrangement, the second shell 2 in the present invention effectively increases the volume on the water inlet side of the second shell 2 by setting the conical cylinder section 21 at the front end, so that the input water can be stored more advantageously. This can effectively ensure that there is sufficient water on the water inlet side of the first flow regulator 3 to be transported to the rear side, thereby ensuring the working stability of the present invention.

[0057] In addition, by setting the conical cylinder section 21, the outer side of the conical cylinder section 21 is matched with the second shell 2, so that an annular gas transmission channel with a certain length in the axial direction is formed between the conical cylinder section 21 and the second shell 2, and the gas transmission channel from the first installation cavity to the outside is gradually reduced in the radial direction. As the flow channel area gradually decreases, the gas can be compressed and accelerated during the transmission process, so that the gas can be discharged with greater kinetic energy. The stability of the airflow is effectively guaranteed and the accurate control of the gas flow is convenient.

[0058] Combination Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, according to an embodiment of the present invention, the second flow regulator 4 is annular in structure as a whole, and a plurality of second channels are arranged at intervals along its circumference. In this embodiment, the second flow regulator 4 is coaxially sleeved on the outer side of the cylindrical section 22 with the second housing 2, and the radial outer side of the second flow regulator 4 is in contact with the inner side of the first housing 1. Through the above arrangement, the second flow regulator 4 realizes the front and rear division of the first installation cavity, and then the airflow input from the rear side can enter the front side only when passing through the second channel of the second flow regulator 4, so as to realize the control of the airflow. In this embodiment, the second flow regulator 4 is arranged at the position of the cylindrical section 22 of the second housing 2, so that the second flow regulator 4 can be closer to the large diameter end of the first housing 1, and the front side cavity of the second flow regulator 4 is larger, which is conducive to the storage of the airflow, and thus can effectively ensure the stability of the airflow output of the present invention. In this embodiment, the second flow regulator 4 realizes flow control by controlling the minimum cross-sectional area of ​​the second channel. For example, movable blades are arranged to realize the size control of the cross section of the second channel.

[0059] Combination Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, according to an embodiment of the present invention, two first connection ports 1b and two second connection ports 1c are respectively provided and are arranged at equal intervals from each other, wherein along the radial direction of the first shell 1, the two first connection ports 1b are arranged opposite to each other, and the two second connection ports 1c are arranged opposite to each other.

[0060] Combination Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, according to one embodiment of the present invention, a diversion structure 11 is provided in the first shell 1; wherein the diversion structure 11 includes: a baffle 111 and a side plate 112. In this embodiment, the baffle 111 is an annular plate, which is sleeved on the outer surface of the cylindrical section 22 through a hollow portion, and its radial outer side surface is connected to the inner side wall of the first shell 1. In this embodiment, the side plate 112 is located between the baffle 111 and the bottom plate of the large diameter end of the first shell 1, and is used to divide the rear liquid accumulation chamber a connecting the third opening 2b and the second connecting port 1c and the rear gas collection chamber b connecting the first installation chamber and the first connecting port 1b. In this embodiment, the rear liquid accumulation chamber a is arranged in a one-to-one correspondence with the second connecting port 1c, and the rear gas collection chamber b is arranged in a one-to-one correspondence with the first connecting port 1b.

[0061] In this embodiment, an opening is provided at a position of the baffle 111 corresponding to the rear gas collecting cavity.

[0062] Combination Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, according to one embodiment of the present invention, the side plate 112 is a long strip-shaped plate. Wherein, along the axial direction of the first shell 1, the opposite ends of the side plate 112 are respectively connected to the baffle 111 and the bottom plate of the large diameter end of the first shell 1; in this embodiment, along the radial direction of the first shell 1, the opposite ends of the side plate 112 are respectively connected to the outer wall of the cylindrical section 22 and the inner wall of the first shell 1; wherein, the thickness of the side plate 112 gradually increases in the direction away from the cylindrical section 22. In this embodiment, along the circumference of the first shell 1, a plurality of side plates 112 are arranged at equal intervals; wherein, four side plates 112 are arranged at equal intervals, thereby realizing the four-equal division of the space between the baffle 111 and the bottom plate, thereby forming the required rear liquid accumulation chamber a and rear gas collection chamber b.

[0063] It should be noted that the first connection port 1b and the second connection port 1c in this solution can also be set to other numbers, for example, 3, 4, etc. Accordingly, the side plates 112 are added to the diversion structure 11 to divide the corresponding rear liquid effusion chambers a and rear gas collection chambers b in corresponding numbers.

[0064] In order to further illustrate this scheme, the working process of this scheme is further elaborated.

[0065] Seawater guiding and regulating process: seawater flows along the positive direction of the x-axis (i.e., the direction from the small diameter end to the large diameter end of the first shell 1). After the seawater enters the conical cylinder section 21 of the second shell 2, the flow rate of the seawater is controlled by the first flow regulator 3, and then the seawater is transported to the space on the rear side of the first flow regulator 3. Through the third opening 2b, the seawater flows into the symmetrically arranged rear liquid accumulation chambers a, and is finally output through the second connecting port 1c connected to the rear liquid accumulation chamber a.

[0066] Cavitation gas guiding and regulating process: the cavitation gas flows in the opposite direction of the x-axis. After the cavitation gas enters the rear gas collecting chamber b through the first connecting port 1b, it enters the first installation chamber through the baffle 111 and the opening corresponding to the rear gas collecting chamber b, and then the flow rate of the cavitation gas is controlled by the second flow regulator 4, and finally discharged from the output docking port along the opposite direction of the x-axis.

[0067] According to another embodiment of the present invention, the coaxial fluid guiding device of the present invention further includes: a third shell and a third flow regulator coaxially arranged with the second shell 2. The third shell is a hollow cylindrical body, and the third shell is coaxial with the second shell 2 and arranged in the second shell 2 at intervals, while the first flow regulator is located between the third shell and the second shell 2, and its arrangement is like the second flow regulator 4, which can be sleeved on the third shell and in contact with the second shell 2, so as to form an adjustable flow effect between the third shell and the second shell 2. In this embodiment, the third flow regulator is arranged inside the third shell,

[0068] In this embodiment, since the third shell is arranged in the second shell, the front end of the third shell is also spaced apart from the front end of the second shell to form an opening for fluid to pass through, and the rear end of the third shell is fixedly connected to the rear end of the first shell 1 to achieve spatial division with the second shell, and a third connection interface is directly arranged at the rear end of the first shell 1 to communicate with the third shell, or, an opening can be opened on the side of the rear end of the third shell, and a second diversion structure identical to the aforementioned diversion structure 11 can be arranged, and then a third connection interface can be correspondingly arranged at the bottom of the first shell according to the position of the chamber divided on the second diversion structure, or, the aforementioned diversion structure 11 can be further divided, and more chambers can be divided by increasing the number of side plates 112, and then a pipeline or a guide channel structure can be added between the second shell and the third shell to achieve the connection between the third shell and the chamber, and then it can be connected to the outside through the third connection interface arranged at the bottom of the first shell 1.

[0069] Of course, a plurality of third shells and corresponding flow regulators may be coaxially arranged in the second shell, and coaxially spaced to divide a plurality of cavities, thereby realizing coaxial guiding and regulating of a plurality of fluids.

[0070] The above contents are merely examples of specific solutions of the present invention. For devices and structures not described in detail therein, it should be understood that they can be implemented by adopting general devices and general methods available in the art.

[0071] The above is only one solution of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A coaxial fluid guiding and regulating device, characterized in that: include: A first housing (1), a second housing (2), a first flow regulator (3) and a second flow regulator (4); The first shell (1) is in the form of a hollow cone as a whole, with a first opening (1a) at its small diameter end and a first connecting port (1b) and a second connecting port (1c) at its large diameter end; The second shell (2) is an axisymmetric hollow structure, which is coaxially arranged inside the first shell (1) with the first shell (1), one end of which is a shell fixing end fixedly connected to the bottom of the first shell (1), and the other end of which is a shell docking end; The first shell (1) and the second shell (2) enclose a first installation cavity for installing the second flow regulator (4), and the first connecting port (1b) is in communication with the first installation cavity; The hollow portion of the second shell (2) constitutes a second installation cavity for installing the first flow regulator (3); The second shell (2) is provided with a second opening (2a) for inputting fluid at the shell docking end, and a third opening (2b) is provided at the shell fixed end, and the third opening (2b) is communicated with the second connection port (1c); An output docking port for communicating with the first installation cavity and outputting fluid is formed between the shell docking end of the second shell (2) and the small diameter end of the first shell (1); The first flow controller (3) is a water flow controller; The second flow controller (4) is a cavitation gas flow controller.

2. The coaxial fluid guiding and regulating device according to claim 1, characterized in that: The end of the shell butt end is flush with the end of the small diameter end of the first shell (1), or the end of the shell butt end exceeds the end of the small diameter end of the first shell (1).

3. The coaxial fluid guiding and regulating device according to claim 2, characterized in that: The second shell (2) comprises: a conical cylinder section (21) and a cylindrical section (22) which are coaxially arranged; The large diameter end of the conical cylinder section (21) is fixedly connected to the cylindrical section (22), and the small diameter end thereof constitutes the shell butt end of the second shell (2); The third opening (2b) is arranged on a side wall of the cylindrical section (22) away from the conical section (21); The first flow regulator (3) is coaxially arranged in the cylindrical section (22) with the cylindrical section (22).

4. The coaxial fluid guiding and regulating device according to claim 3, characterized in that: The first flow regulator (3) is in the form of a cylindrical structure as a whole, and a first channel is provided at its center; Along the axial direction of the cylindrical section (22), the first flow regulator (3) and the two opposite ends of the cylindrical section (22) are spaced apart from each other.

5. The coaxial fluid guiding and regulating device according to claim 4, characterized in that: The second flow regulator (4) is annular in structure as a whole, and is provided with a plurality of second channels spaced apart along its circumference; The second flow regulator (4) and the second shell (2) are coaxially sleeved on the outer surface of the cylindrical section (22), and the radial outer side surface of the second flow regulator (4) is in contact with the inner side surface of the first shell (1).

6. The coaxial fluid guiding and regulating device according to claim 5, characterized in that: A flow splitting structure (11) is provided in the first shell (1); The flow diversion structure (11) comprises: a baffle (111) and a side plate (112); The baffle (111) is an annular plate, which is sleeved on the outer surface of the cylindrical section (22) through a hollow portion, and its radial outer side surface is connected to the inner side wall of the first shell (1); The side plate (112) is located between the baffle plate (111) and the bottom plate of the large diameter end of the first shell (1), and is used to separate a rear liquid accumulation cavity connecting the third opening (2b) and the second connecting port (1c) and a rear gas collection cavity connecting the first installation cavity and the first connecting port (1b); An opening is provided at a position of the baffle (111) corresponding to the rear gas collecting cavity.

7. The coaxial fluid guiding and regulating device according to claim 6, characterized in that: Along the axial direction of the first shell (1), opposite ends of the side plate (112) are respectively connected to the baffle plate (111) and the bottom plate of the large diameter end of the first shell (1); Along the radial direction of the first shell (1), opposite ends of the side plate (112) are respectively connected to the outer side wall of the cylindrical section (22) and the inner side wall of the first shell (1); Along the circumference of the first shell (1), a plurality of side plates (112) are arranged at equal intervals.

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