CN217383385U

CN217383385U - Multi-connecting-pipe pressure container

Info

Publication number: CN217383385U
Application number: CN202220649458.XU
Authority: CN
Inventors: 邓锟; 金海龙; 韦腾飞; 张克鹏; 郑明超; 马彦婷
Original assignee: Zhejiang Dunan Artificial Environment Co Ltd
Current assignee: Zhejiang Dunan Artificial Environment Co Ltd
Priority date: 2022-03-23
Filing date: 2022-03-23
Publication date: 2022-09-06
Anticipated expiration: 2032-03-23
Also published as: WO2023179184A1

Abstract

The application relates to a multi-connecting-pipe pressure vessel which comprises a shell, a cover body and at least two connecting pipes, wherein one end of the shell is arranged with an opening, and the cover body is arranged at the opening and connected with the shell; the cover body at least comprises a plane part which is arranged in a plane shape, the plane part is arranged at one end of the cover body far away from the opening, the plane part is provided with a mounting hole corresponding to each connecting pipe, and one end of each connecting pipe extends into the shell through the mounting hole; the inner diameter of the shell is D, the maximum diameter of the plane part is D1, and the following relation is satisfied between D and D1: d1 is less than or equal to D/1.4. The size of the plane part is defined by defining the size ratio of the plane part to the shell, thereby improving the structure of the cover body. The ability reinforcing of lid shock resistance and anti deformation has promoted the intensity of lid, prolongs its life. Test data prove that when D1 is not more than D/1.4, the strength and the impact resistance effect of the cover body are improved obviously.

Description

Multi-connecting-pipe pressure container

Technical Field

The application relates to the technical field of liquid storage, in particular to a multi-connection-pipe pressure container.

Background

The multi-connection pipe pressure vessel, such as a gas-liquid separator, a liquid accumulator and the like, is an important component in a refrigeration system, and is usually installed between an evaporator and a compressor to store refrigerant and separate gas from liquid, so that a gas-phase medium is ensured to be sucked into the compressor, a liquid-phase medium is prevented from being sucked into a working cavity of the compressor to form liquid impact, and meanwhile, the multi-connection pipe pressure vessel also has the function of filtering impurities.

The multi-connection-pipe pressure vessel comprises a shell, a cover body and a connection pipe, wherein one end of the shell, which is far away from an evaporator, is of an open structure, the cover body is covered on the open position and is connected with the shell, one end of the connection pipe penetrates through the cover body and extends into the shell, and the other end of the connection pipe is connected with a compressor. The refrigerant medium flowing into the multi-connection-pipe pressure container from the evaporator comprises gaseous refrigerant medium and liquid refrigerant medium, the gaseous refrigerant medium flows back into the compressor through the connection pipes, and the liquid refrigerant medium is stored in the cover body.

As shown in fig. 1, the cover body specifically includes a first connection portion 100a, a second connection portion 200a and a transition portion 300a, the first connection portion 100a is connected with the housing, the second connection portion 200a is connected with the adapter, and the first connection portion 100a and the second connection portion 200a are connected through the transition portion 300 a. The second connecting portion 200a for connecting two or more connection pipes is generally a flat planar portion having a planar shape. In the prior art, the size of the plane part is larger and is close to that of the shell, namely, the transition part is of a cylindrical structure, and the cover body of the structure has poor strength. The liquid refrigerant medium flowing to the cover body almost completely directly impacts on the plane part, the impact force is perpendicular to the plane part, the impact on the plane part and the whole cover body is large, the destructive power is strong, and the deformation and the damage of the cover body are easily caused.

Disclosure of Invention

In view of the above, it is desirable to provide a multi-joint pressure vessel that can improve the strength of the lid.

A multi-connecting-pipe pressure vessel comprises a shell, a cover body and at least two connecting pipes, wherein one end of the shell is arranged in an open manner, and the cover body is arranged at the open position in a covering manner and is connected with the shell;

the cover body at least comprises a plane part which is arranged in a plane shape, the plane part is arranged at one end of the cover body far away from the opening, the plane part is provided with mounting holes corresponding to each connecting pipe, and one end of each connecting pipe extends into the shell through the mounting hole;

the inner diameter of the shell is D, the maximum diameter of the plane part is D1, and the following relation is satisfied between D and D1: d1 is less than or equal to D/1.4.

The beneficial effect of this scheme of adoption:

compared with the prior art, the size of the plane part is limited by limiting the size ratio of the plane part to the shell, so that the structure of the cover body is improved. Since D1 is not more than D/1.4, the cover body comprises a transition part connected with the plane part, and the distance between the transition part and the central axis of the shell is smaller as the transition part is closer to the plane part along the axial direction of the shell at least at the part close to the plane part, so that an inclined surface is formed at least at the position close to the plane part. When the liquid refrigerant medium flows toward the lid, part of the liquid refrigerant medium flows toward the flat surface portion, and the remaining part of the liquid refrigerant medium flows toward the inclined surface. There is the contained angle between the flow direction of liquid refrigerant medium and the inclined plane, makes the impact force can decompose into the first force along the inclined plane direction and the second force of perpendicular to inclined plane direction, and the deformation and the destruction on inclined plane are mainly decided by the second force, because the existence of contained angle, and the second force is far less than the impact force, weakens the impact of lid, and the lid is strikeed and is resisted the ability reinforcing of deformation, has promoted the intensity of lid, prolongs its life. Test data prove that the strength and the impact resistance effect of the cover body are improved obviously when D1 is not more than D/1.4, namely D/D1 is not less than 1.4.

In one embodiment, a side surface of the planar portion facing the housing is provided with a flange, and the flange is arranged around the corresponding mounting hole and is in transition connection with the hole wall of the mounting hole through a fillet;

the diameter of an inner hole of the flanging is d2, the radius of the fillet is r, and the d1, the d2 and the r satisfy the following relations: d1 is more than or equal to 2.1(d2+2 r).

The connecting pipe is welded with the flanging after being inserted into the inner hole, and the flanging is in transition connection with the hole wall of the mounting hole through a fillet, so that the connecting pipe is prevented from being broken due to stress concentration. Although the maximum diameter d1 of the plane part is smaller and better from the strength of the cover body, d1 needs to meet the installation requirement of the connecting pipe, and under the condition that the diameter of the inner hole of the flanging is fixed, the smaller d1 is, the closer the flanging is to the edge of the plane part, the smaller the distance between the flanging and the transition fillet of the hole wall of the installation hole, and the distance between the edge of the hole wall of the installation hole and the edge of the plane part is, the smoother the transition between the flanging and the transition part is, the more easily stress concentration occurs at the position, the poorer the strength is, the more easily the fracture is, so the plane part needs to be large enough to leave enough transition space at two sides of the installation hole.

In one embodiment, the cover further includes a connecting portion and a transition portion, the cover is connected to the housing through the connecting portion, and the connecting portion is connected to the planar portion through the transition portion.

In one embodiment, the transition portion is an arc transition portion, and the center of the arc transition portion is located inside the cover body. The arc transition part is convex, and the internal volume is bigger, can save more coolant.

In one embodiment, a first round chamfer is arranged between the transition part and the plane part, so that the transition part and the plane part are in smooth transition, and the influence of stress concentration on the whole strength of the cover body is prevented.

In one embodiment, the radius of the first round chamfer is R1, the wall thickness of the cover body is delta, and the requirement between the R1 and the delta is satisfied, wherein R1 is larger than or equal to delta. By setting R1 to be more than or equal to delta, smooth transition connection between the transition part and the inner side of the plane part is ensured, and meanwhile, the wall thickness and the strength of the connection part are ensured.

In one embodiment, the radius of the first round chamfer is R1, the inner diameter of the transition part is R2, and the ratio between R1 and R2 is R2> R1. The length of the cover body in the axial direction is lengthened as much as possible, the area of the bottom surface of the cover body is reduced, the first round chamfer is connected with the transition part and the plane part more smoothly, and the transition is more stable.

In one embodiment, the central axis of the housing passes through the center of the transition. The transition part forms an arc section along the axial section, under the condition that the size of the connecting part and the plane part is fixed, the larger the inner diameter of the arc section is, the longer the length of the arc section along the axial direction is, the steeper the transition is, the unsmooth the transition of the arc section, the connecting part and the plane part is, the more easily stress concentration occurs at the transition part, the strength is influenced, and under the same raw materials, the longer the length of the arc section along the axial direction is, the larger the size of the cover body is, the thinner the wall thickness is, and the worse the strength is; meanwhile, the smaller the inner diameter of the arc-shaped section is, the more gentle the arc-shaped section is, the smaller the included angle between the flow direction of the liquid refrigerant medium and the arc-shaped section is, the larger the second force is, the poorer the strength of the cover body is, the more gentle the arc-shaped section is, the smaller the length of the transition section in the axial direction is, and the smaller the volume of the cover body is. The center pin of selecting the casing in this application passes through the center of transition portion makes the gentle degree of segmental arc, all moderate along axial length, compromises under the condition of volume, thickness, and lid intensity can reach the optimal value.

In one embodiment, the connecting portion is sleeved outside the housing and welded, and a second round chamfer is arranged between the transition portion and the connecting portion. So that the transition part is smoothly connected with the connecting part, and the influence on the strength of the cover body caused by stress concentration is prevented.

In one embodiment, the connecting portion is inserted into the housing and welded.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the description of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the description below are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic perspective view of a cover in the prior art.

Fig. 2 is a schematic structural diagram of a multi-joint pressure vessel provided by the present application.

Fig. 3 is a schematic structural diagram of another multi-joint pressure vessel provided by the present application.

Fig. 4 is a schematic view of a perspective structure of a structural cover according to the present application.

Fig. 5 is a schematic perspective view of another perspective view of a structural cover according to the present application.

Fig. 6 is a schematic perspective view of another structure of a cover body provided in the present application.

FIG. 7 is a graph of life-D/D1 relationship for a cover as provided herein.

Reference numerals:

100a, a first connection portion; 200a, a second connecting part; 300a, a transition portion;

100. a housing; 200. a fixing plate; 300. a cover body; 310. a connecting portion; 320. a planar portion; 321. mounting holes; 330. a transition section; 340. flanging; 341. an inner bore; 350. a first round chamfer; 360. a second round chamfer; 400. and (6) taking over the pipe.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.

It will be understood that when an element is referred to as being "secured to" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used in the description of the present application are for illustrative purposes only and do not represent the only embodiments.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact via an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the description of this application, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The error-proofing gear mechanism and the air conditioner for vehicle according to the present invention will be described in further detail with reference to the accompanying drawings and embodiments:

the present invention will be described below by taking a gas-liquid separator as an example, but those skilled in the art will understand that the present invention can be applied to other multi-connection pipe pressure vessels.

And the gas-liquid separator is arranged in the refrigerating system, is arranged between the evaporator and the compressor and is used for storing the refrigerant and separating gas from liquid. Referring to fig. 2 and 3, the gas-liquid separator includes a housing 100, a fixing plate 200, a cover 300, and at least two connection pipes 400, wherein an end of the housing 100 away from the evaporator is open, the cover 300 covers the open and is connected to the housing 100, the fixing plate 200 is installed in the housing 100, one end of the connection pipe 400 is fixed to the fixing plate 200, and the other end of the connection pipe 400 penetrates out of the cover 300 and is connected to the compressor. The fixing plate 200 is further provided with a through hole, a gaseous refrigerant medium in the refrigerant medium flowing from the evaporator into the gas-liquid separator flows back to the compressor through the connection pipe 400, and a liquid refrigerant medium flows down through the through hole and is stored in the cover 300.

As shown in fig. 2 to 6, the cover 300 includes a connecting portion 310, a planar portion 320 and a transition portion 330, the connecting portion 310 is connected to the housing 100, the housing 100 is generally cylindrical, so that the connecting portion 310 is generally annular, and the connecting portion 310 can be sleeved outside the housing 100 and welded or inserted into the housing 100 and welded; the plane portion 320 is disposed at an end of the cover 300 away from the opening, and is disposed in a planar shape, and is connected to the connection pipe 400, and is generally a circular plane; the transition portion 330 connects the connecting portion 310 and the planar portion 320.

Of course, in other embodiments, the housing 100 may also be a hollow housing 100 with other shapes, in which case the connecting portion 310 also has a shape corresponding to the shape of the housing 100, and the flat portion 320 may be a circular flat portion 320, or a flat portion 320 with other shapes, which may be selected according to actual needs.

The connection with the adapter 400 is made with the flat portion 320, mainly for the case of two or more adapters 400. The plane portion 320 is formed with mounting holes 321 corresponding to each adapter 400, and one end of the adapter 400 extends into the housing 100 through the mounting holes 321 and is mounted on the fixing plate 200. Assuming that the inner diameter of the housing 100 is D, the diameter of the circular plane portion 320 is D1, and D1 satisfy the following relationship: d1 is less than or equal to D/1.4.

When planar segment 320 is of other non-circular shapes, d1 is the maximum diameter of planar segment 320.

In the present embodiment, the size of the flat portion 320 is defined by defining the size ratio of the flat portion 320 to the housing 100, thereby improving the structure of the cover 300. Since D1 is equal to or less than D/1.4, the transition portion 330 is closer to the flat surface portion 320 at least in a portion close to the flat surface portion 320, and the closer to the flat surface portion 320, the smaller the distance from the center axis of the housing 100 in the axial direction of the housing 100, thereby forming an inclined surface at least in a position close to the flat surface portion 320. When the liquid refrigerant flows toward the cover 300, a part of the liquid refrigerant flows toward the flat surface portion 320, and the remaining part of the liquid refrigerant flows toward the inclined surface. There is the contained angle between the flow direction of liquid refrigerant medium and the inclined plane, makes the impact force can decompose into the first force along the inclined plane direction and the second force of perpendicular to inclined plane direction, and the deformation and the destruction of inclined plane are mainly decided by the second force, because the existence of contained angle, and the second force is far less than the impact force, weakens the impact of lid 300, and lid 300 is strikeed and is resisted the ability reinforcing of deformation, has promoted the intensity of lid 300, prolongs its life. Through multiple designs, adjustments and tests, the strength and impact resistance of the cover body 300 are remarkably improved when D1 is not more than D/1.4.

In order to improve the stability of the connection pipe 400 after installation, a turned-over edge 340 is arranged on one side surface of the plane part 320 facing the shell 100, an inner hole 341 is formed in the middle of the turned-over edge 340, the turned-over edge 340 is arranged at the corresponding installation hole 321 in a surrounding mode and is in transition connection with the hole wall of the installation hole 321 through a fillet, the connection pipe 400 is welded with the turned-over edge 340 after being inserted into the inner hole 341, and the turned-over edge 340 is in transition connection with the hole wall of the installation hole 321 through a fillet, so that the connection pipe 400 is driven to shake when a gaseous refrigerant medium flows in the connection pipe 400, and further the connection pipe is broken due to stress concentration.

Although the diameter d1 of the planar portion 320 is smaller as the diameter d1 is better from the strength of the cover 300, d1 needs to satisfy the installation of the adapter 400, and in the case that the diameter of the inner hole 341 of the flange 340 is fixed, d1 is smaller, the closer the flange 340 is to the edge of the planar portion 320, the smaller the distance between the flange 340 and the transition fillet of the hole wall of the installation hole 321, and the distance between the hole wall of the installation hole 321 and the edge of the planar portion 320 is, the smoother the transition between the flange 340 and the transition portion 330 is, the more likely stress concentration occurs here, the poorer the strength is, the more likely the fracture is, so the planar portion 320 needs to be large enough. Specifically, in the present embodiment, the diameter of the inner hole 341 is d2, and the radius of the fillet is r, so that d1, d2 and r satisfy the following relationship: d1 is more than or equal to 2.1(d2+2r) to leave enough transition space on both sides of the mounting hole 321.

The transition portion 330 in this embodiment is preferably an arc-shaped transition portion, the center of which is located inside the cover 300. The arc transition part is convex, and the internal volume is bigger, can save more coolant.

Of course, in other embodiments, the arc transition portion may also be concave, and the center of the arc transition portion is located outside the cover 300.

Of course, in other embodiments, the transition portion 330 is not limited to an arc shape, and may have other shapes such as a cone shape.

In order to prevent stress concentration at the connection between the transition portion 330 and the planar portion 320, a first rounded chamfer 350 is disposed between the transition portion 330 and the planar portion 320, so that the transition portion 330 and the planar portion 320 are smoothly transitioned to further improve the overall strength of the cover 300. The first rounded chamfer 350 has two ends smoothly connected to the transition portion 330 and the planar portion 320.

Assuming that the radius of the first rounded chamfer 350 is R1 and the wall thickness of the lid 300 is δ, if the radius of the first rounded chamfer 350 is too small, the transition portion 330 is linearly connected to the inner side of the planar portion 320, and the first rounded chamfer 350 fills in the gap outside the linear connection. Therefore, in order to ensure smooth transition connection between the transition portion 330 and the inner side of the planar portion 320, R1 and δ are satisfied, and R1 is ≧ δ. Therefore, the transition part 330 is connected with the inner side of the plane part 320 through the smooth transition of the inner wall of the first round chamfer 350, the transition part 330 is connected with the outer side of the plane part 320 through the smooth transition of the outer wall of the first round chamfer 350, and the wall thickness and the strength of the joint are ensured.

The inner diameter of the transition part 330 is R2, so as to lengthen the axial length of the cover 300 as much as possible, reduce the area of the bottom surface of the cover 300, and make the connection between the first rounded chamfer 350 and the transition part 330 and the plane part 320 smoother, the transition is more stable, and it is necessary to satisfy the requirement between R1 and R2, R2> R1.

In order to improve the versatility of the transition portion 330 and the planar portion 320 unit formed by the planar portion 320 and reduce the production difficulty, the transition portion 330 may have a uniform specification, that is, the transition portion 330 has a fixed size, for example, the outer diameter of the transition portion 330 is designed to be substantially the same as the inner diameter of the opening of the housing 100.

When the connecting portion 310 is sleeved outside the housing 100, as shown in fig. 2, 4 and 5, the diameter of the connecting portion 310 is larger than the diameter of the connecting end of the transition portion 330 and the connecting portion 310, so that a second round chamfer 360 is provided between the transition portion 330 and the connecting portion 310 to smoothly connect the transition portion 330 and the connecting portion 310, thereby preventing stress concentration from occurring there and affecting the strength of the cover 300. The two ends of the second round chamfer 360 are smoothly transitionally connected with the transition part 330 and the connecting part 310.

When the connection part 310 is inserted outside the housing 100, as shown in fig. 3 and 6, the diameter of the connection part 310 is the same as that of the connection end, and the connection part 310 is butted against the connection end.

The transition part 330 forms an arc-shaped section along the axial cross section, under the condition that the size of the connecting part 310 and the plane part 320 is fixed, the larger the inner diameter of the arc-shaped section is, the longer the length of the arc-shaped section along the axial direction is, the steeper the arc-shaped section is, the smoother the transition of the arc-shaped section with the connecting part 310 and the plane part 320 is, the easier the stress concentration occurs at the transition part, the strength is influenced, and under the same raw material, the longer the length of the arc-shaped section along the axial direction is, the larger the volume of the cover body 300 is, the thinner the wall thickness is, and the worse the strength is; meanwhile, the smaller the inner diameter of the arc section is, the more gentle the arc section is, the smaller the included angle between the flow direction of the liquid refrigerant medium and the arc section is, the larger the second force is, the poorer the strength of the cover body 300 is, the more gentle the arc section is, the smaller the length of the transition section in the axial direction is, and the smaller the volume of the cover body 300 is. In the present embodiment, it is preferable that the central axis of the casing 100 passes through the center of the transition portion 330, the flatness of the arc-shaped section and the length in the axial direction are both moderate, and the strength of the cover 300 can be optimized in consideration of the volume and the thickness.

The impact resistance test results of the cover 300 of the present application are shown in table 1, and the life-D/D1 relationship graph obtained from the test results is shown in fig. 7.

TABLE 1

D/d1	Life/time
		1.2	57532
1.3	93635
		1.4	200000
1.5	376423
		1.6	658410

As is clear from Table 1 and FIG. 7, when D/D1 is greater than or equal to 1.4, i.e., D1 is less than or equal to D/1.4, the life of the cover 300 is significantly increased, i.e., the strength and impact resistance of the cover 300 are significantly improved.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. A multi-connection-pipe pressure vessel comprises a shell (100), a cover body (300) and at least two connection pipes (400), wherein one end of the shell (100) is arranged with an opening, and the cover body (300) is arranged at the opening and connected with the shell (100);

the novel cover is characterized in that the cover body (300) at least comprises a plane part (320) which is arranged in a plane shape, the plane part (320) is arranged at one end, far away from the opening, of the cover body (300), the plane part (320) is provided with mounting holes (321) corresponding to the connecting pipes (400), and one ends of the connecting pipes (400) extend into the shell (100) through the mounting holes (321);

the inner diameter of the shell (100) is D, the maximum diameter of the plane part (320) is D1, and the following relation is satisfied between D and D1: d1 is less than or equal to D/1.4.

2. The multi-connection-pipe pressure vessel according to claim 1, wherein a flange (340) is provided on a side of the planar portion (320) facing the shell (100), the flange (340) is surrounded at the corresponding mounting hole (321) and is in transition connection with the hole wall of the mounting hole (321) through a fillet;

the diameter of an inner hole (341) of the flanging (340) is d2, the radius of the fillet is r, and the d1, d2 and r satisfy the following relations: d1 is more than or equal to 2.1(d2+2 r).

3. The multi-nozzle pressure vessel according to claim 1, wherein the cover (300) further comprises a connecting portion (310) and a transition portion (330), the cover (300) being connected to the shell (100) by the connecting portion (310), the connecting portion (310) being connected to the planar portion (320) by the transition portion (330).

4. The multi-tap pressure vessel of claim 3, wherein the transition (330) is an arcuate transition centered within the cap body (300).

5. The multi-tap pressure vessel of claim 4, wherein a first rounded chamfer (350) is provided between the transition portion (330) and the planar portion (320).

6. The multi-nozzle pressure vessel according to claim 5, wherein the radius of the first rounded chamfer (350) is R1, the wall thickness of the cover body (300) is δ, and the requirement between R1 and δ is satisfied, R1 ≧ δ.

7. The multi-nozzle pressure vessel according to claim 5, wherein the first rounded chamfer (350) has a radius R1, the transition (330) has an inner diameter R2, and R2> R1 is required between R1 and R2.

8. The multi-tap pressure vessel of claim 5, wherein a central axis of the shell (100) passes through a center of the transition (330).

9. The multi-nozzle pressure vessel according to claim 3, wherein the connecting portion (310) is sleeved outside the shell (100) and welded, and a second rounded chamfer (360) is provided between the transition portion (330) and the connecting portion (310).

10. The multi-nozzle pressure vessel according to claim 3, wherein the connecting portion (310) is inserted into the shell (100) and welded.