WO2023179184A1 - Multi-connection-pipe pressure vessel - Google Patents

Abstract

A multi-connection-pipe pressure vessel. The multi-connection-pipe pressure vessel comprises a housing (100), a cover body (300) and at least two connection pipes (400), one end of the housing (100) being arranged open, and the cover body (300) covering the opening and being connected to the housing (100). The cover body (300) comprises a planar part (320) arranged in a planar shape, the planar part (320) being arranged at the end of the cover body (300) away from the opening, mounting holes (321) corresponding to respective connection pipes (400) being formed in the planar part (320), and one end of each connection pipe (400) extending into the housing (100) via a mounting hole (321). The inner diameter of the housing (100) is D, the maximum diameter of the planar part (320) is d₁, and D and d₁ satisfy the following relationship: d₁≤D/1.4.

Description

Multi-tube pressure vessel

Related applications

This application claims priority to the Chinese patent application filed on March 23, 2022, with the application number 202220649458.

Technical field

The present application relates to the field of liquid storage technology, and in particular to a multi-tube pressure vessel.

Background technique

Multi-tube pressure vessels, such as gas-liquid separators, liquid receivers, etc., are an important component in the refrigeration system. They are usually installed between the evaporator and the compressor to store the refrigerant, separate gas and liquid, and ensure that it is sucked into the compressor. The gas phase medium in the compressor prevents the liquid phase medium from being sucked into the working chamber of the compressor to form liquid shock, and it also has the function of filtering impurities.

The multi-tube pressure vessel includes a shell, a cover and a nozzle. The end of the shell away from the evaporator is an open structure. The cover is located at the open opening and is connected to the shell. One end of the nozzle passes through the cover and extends into the shell. , the other end of the pipe is connected to the compressor. The refrigerant medium flowing from the evaporator into the multi-tube pressure vessel includes gaseous refrigerant medium and liquid refrigerant medium. The gaseous refrigerant medium flows back to the compressor through the pipes, and the liquid refrigerant medium is stored in the cover.

As shown in Figure 1, the cover includes a first connection part 100a, a second connection part 200a and a transition part 300a. The first connection part 100a is connected to the shell, the second connection part 200a is connected to the pipe, and the first connection part 100a is connected to the pipe. The second connection part 200a is connected by the transition part 300a. The second connecting part 200a used to connect two or more pipes is generally a planar flat part. In the related art, the size of the flat part is larger, close to the size of the casing, that is, the transition part is a cylindrical structure, and the cover body of this structure has poor strength. The liquid refrigerant flowing to the cover body directly impacts the flat part, and the flat part is subject to a vertical impact force. The impact on the flat part and the entire cover body is large and destructive, and it is easy to cause deformation and damage of the cover body.

Contents of the invention

According to various embodiments of the present application, a multi-tube pressure vessel is provided.

A multi-tube pressure vessel includes a shell, a cover and at least two pipes. One end of the shell is open, and the cover is located at the open end and connected to the shell;

The cover body includes a planar portion arranged in a planar shape. The planar portion is provided at an end of the cover body away from the opening. The planar portion is provided with a mounting hole corresponding to each of the pipes. One end of the pipe extends into the housing through the mounting hole;

The inner diameter of the housing is D, the maximum diameter of the flat part is d ₁ , and the following relationship is satisfied between D and d ₁ : d ₁ ≤ D/1.4.

In one embodiment, a flange is provided on one side of the flat portion facing the housing, and the flange is surrounding the corresponding mounting hole and between the flange and the hole wall of the mounting hole. Connect through rounded transitions;

Wherein, the inner hole diameter of the flange is d ₂ , the radius of the fillet is r, d ₁ , d ₂ and r satisfy the following relationship: d ₁ ≥ 2.1 (d ₂ +2r).

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 part is an arc-shaped transition part, and the center of the arc-shaped transition part is located inside the cover.

In one embodiment, a first circular chamfer is provided between the transition portion and the planar portion.

In one embodiment, the radius of the first circular chamfer is R ₁ , the wall thickness of the cover is δ, and the following relationship is satisfied between R ₁ and δ: R ₁ ≥ δ .

In one embodiment, the radius of the first circular chamfer is R ₁ , the inner diameter of the transition portion is R ₂ , and the following relationship between R ₁ and R ₂ is satisfied: R ₂ > _R1 .

In one embodiment, the central axis of the housing passes through the center of the transition portion.

In one embodiment, the connecting portion is sleeved outside the housing and fixedly connected, and a second circular chamfer is provided between the transition portion and the connecting portion.

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

The details of one or more embodiments of the present application are set forth in the following drawings and description to make other features, objects, and advantages of the present application more concise and understandable.

Description of the drawings

To better describe and illustrate embodiments and/or examples of the present application disclosed herein, reference may be made to one or more of the accompanying drawings. The additional details or examples used to describe the figures should not be construed as limiting the scope of any of the disclosed applications, the embodiments and/or examples presently described, and the best mode currently understood of these applications.

Figure 1 is a schematic diagram of the three-dimensional structure of a cover in the related art.

Figure 2 is a schematic structural diagram of a multi-tube pressure vessel provided by an embodiment of the present application.

Figure 3 is a schematic structural diagram of another multi-tube pressure vessel provided by an embodiment of the present application.

Figure 4 is a schematic three-dimensional structural diagram of a structural cover provided by an embodiment of the present application.

Figure 5 is a schematic three-dimensional structural diagram of a structural cover provided by an embodiment of the present application from another perspective.

Figure 6 is a schematic three-dimensional structural diagram of another structural cover provided by an embodiment of the present application.

Figure 7 is a life-D/d ₁ relationship diagram of the cover provided by the embodiment of the present application.

Reference signs:

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

100. Shell; 200. Fixed plate; 300. Cover; 310. Connection part; 320. Flat part; 321. Mounting hole; 330. Transition part; 340. Flange; 341. Inner hole; 350. First circle Shape chamfer; 360, second circular chamfer; 400, take over.

Detailed ways

In order to make the above objects, features and advantages of the present application more obvious and easy to understand, the specific implementation modes of the present application will be 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. However, the present application can be implemented in many other ways different from those described here. Those skilled in the art can make similar improvements without violating the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

It should be noted that when a component is said to be "fixed" or "set to" another component, it can be directly on the other component or there may also be an intermediate component present. When a component is said to be "connected" to another component, it may be directly connected to the other component or there may be an intermediate component present at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the description of this application are for illustrative purposes only and do not represent the only implementation. Way.

In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically limited.

In this application, unless otherwise expressly stated and limited, the first feature "on" or "below" the second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact with each other. Contact through intermediaries. Furthermore, the terms "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "below" and "below" the first feature of the second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature has a smaller horizontal height than the second feature.

Unless otherwise defined, all technical and scientific terms used in the description of this application have the same meanings as commonly understood by those skilled in the technical field of this application. The terms used in the description of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification of this application, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The present application is described below taking a gas-liquid separator as an example, but those skilled in the art can understand that the present application can be applied to other multi-tube pressure vessels.

The gas-liquid separator is located in the refrigeration system and is installed between the evaporator and the compressor to store refrigerant and separate gas and liquid. Referring to Figures 2 and 3, the gas-liquid separator includes a casing 100, a fixed plate 200, a cover 300 and at least two pipes 400. The casing 100 is provided with an open end away from the evaporator, and the cover 300 covers the open end. and connected to the casing 100. The fixing plate 200 is installed in the casing 100. One end of the nozzle 400 is fixed on the fixing plate 200, and the other end goes out of the cover 300 and is connected to the compressor. The fixed plate 200 is also provided with a through hole. The gaseous refrigerant medium flowing from the evaporator into the gas-liquid separator flows back to the compressor through the pipe 400, while the liquid refrigerant medium flows down through the through hole and is stored in the casing 100.

As shown in Figures 2 to 6, the cover 300 includes a connecting part 310, a flat part 320 and a transition part 330. The connecting part 310 is connected to the casing 100. The casing 100 is generally a cylindrical structure, so the connecting part 310 is generally annular. The connection part, the connection part 310 can be placed outside the housing 100 and fixedly connected, such as welding, etc., or it can be inserted into the housing 100 and fixedly connected, such as welding, etc.; the flat part 320 is provided on the cover 300 away from the opening. One end is arranged in a planar shape and is connected to the nozzle 400 , which 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 of other shapes. In this case, the connecting part 310 may also have a corresponding shape matching the shape of the opening of the housing 100, and the flat part 320 may be round. The flat part 320 may also be a flat part 320 of other shapes, which may be selected according to actual needs.

The flat portion 320 is used at the connection point with the nozzle 400, mainly for the case of two or more nozzles 400. The flat portion 320 is provided with a mounting hole 321 corresponding to each pipe 400 . One end of the pipe 400 extends into the housing 100 through the mounting hole 321 and is installed on the fixing plate 200 . The inner diameter of the housing 100 is D, the diameter of the circular planar portion 320 is d ₁ , and the following relationship is satisfied between D and d ₁ : d ₁ ≤ D/1.4.

When the flat portion 320 has other non-circular shapes, d ₁ is the maximum diameter of the flat portion 320 .

In this embodiment, the size of the flat part 320 is limited by limiting the size ratio of the flat part 320 to the housing 100, thereby improving the structure of the cover 300. Since d ₁ ≤ D/1.4, at least in the part close to the flat part 320 , along the axis direction of the housing 100 , the distance between the transition part 330 and the central axis of the housing 100 becomes smaller as it gets closer to the flat part 320 . An inclined surface is formed at the position of the flat portion 320 . When the liquid refrigerant flows to the cover 300, part of it flows to the flat part 320, and the remaining part flows to the inclined surface. There is an angle between the flow direction of the liquid refrigerant medium and the inclined surface, so that the impact force can be decomposed into a first force along the direction of the inclined surface and a second force perpendicular to the direction of the inclined surface. The deformation and damage of the inclined surface are mainly determined by the second force. Due to the existence of the included angle, the second force is much smaller than the impact force, and the impact on the cover 300 is weakened. The impact and deformation resistance of the cover 300 is enhanced, which improves the strength of the cover 300 and prolongs its service life. Through multiple designs, adjustments and tests, it has been proven that when d ₁ ≤ D/1.4, the strength and impact resistance of the cover 300 are significantly improved.

In order to improve the stability of the nozzle 400 after installation, a flange 340 is provided on one side of the flat portion 320 facing the housing 100. An inner hole 341 is formed in the middle of the flange 340. The flange 340 is surrounded by the corresponding installation hole 321 and connected with the installation hole 321. The walls of the mounting hole 321 are connected through a fillet transition. After the nozzle 400 is inserted into the inner hole 341, it is fixedly connected to the flange 340, such as by welding. The flange 340 and the wall of the mounting hole 321 are connected through a fillet transition. connection to prevent the gaseous refrigerant medium from flowing in the pipe 400 from causing the pipe 400 to shake, causing stress concentration here and causing it to break.

Although in terms of the strength of the cover 300 , the smaller the diameter d ₁ of the flat portion 320 is, the better, but d ₁ needs to satisfy the installation of the nozzle 400 , and when the diameter of the inner hole 341 of the flange 340 is constant, the smaller the diameter d ₁ Smaller, the closer the flange 340 is to the edge of the flat part 320, the smaller the transition radius between the flange 340 and the wall of the mounting hole 321, and the distance between the wall of the mounting hole 321 and the edge of the flat part 320, the smaller the distance between the flange 340 and the transition part The less smooth the transition of 330 is, the easier it is for stress concentration, reduced strength, and easy breakage. Therefore, the design of the flat portion 320 needs to be of sufficient size. Specifically, the diameter of the inner hole 341 is d ₂ and the radius of the fillet is r. Let d ₁ , d ₂ and r satisfy the following relationship: d ₁ ≥ 2.1 (d ₂ +2r), so as to leave space on both sides of the mounting hole 321 Enough transition space.

The transition part 330 in this embodiment may be an arc-shaped transition part, and the center of the arc-shaped transition part is located inside the cover 300 . The arc-shaped transition part is convex and has a larger internal volume, which can store more cooling medium.

Of course, in other embodiments, the arc-shaped transition portion can also be concave, in which case the center of the arc-shaped 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 can also be a cone shape or other shapes.

In order to prevent stress concentration at the connection between the transition part 330 and the planar part 320, a first circular chamfer 350 is provided between the transition part 330 and the planar part 320 to make a smooth transition between the transition part 330 and the planar part 320 to further improve the Cover body 300 overall strength. Both ends of the first circular chamfer 350 are smoothly connected to the transition portion 330 and the planar portion 320 .

Assume that the radius of the first circular chamfer 350 is R ₁ and the wall thickness of the cover 300 is δ. If the radius of the first circular chamfer 350 is too small, the transition portion 330 is connected to the inner side of the planar portion 320 , and the first Round chamfer 350 fills the gap outside the wire connection. Therefore, in order to ensure a smooth transition connection between the transition portion 330 and the inner side of the planar portion 320, the following relationship is satisfied between R ₁ and δ: R ₁ ≥ δ. Therefore, the transition portion 330 and the inner side of the planar portion 320 are smoothly transitionally connected through the inner wall of the first circular chamfer 350, and the transition portion 330 and the outer side of the planar portion 320 are smoothly transitionally connected through the outer wall of the first circular chamfer 350, ensuring the wall thickness of the connection. and intensity.

The inner diameter of the transition portion 330 is R ₂ . In order to extend the length of the cover 300 in the axial direction as much as possible and reduce the bottom surface area of the cover 300 , the first circular chamfer 350 is also connected to the transition portion 330 and the flat portion 320 Smoother and more stable transition, let R ₁ and R ₂ satisfy the following relationship: R ₂ >R ₁ .

In order to improve the versatility of the transition part 330 and the flat part 320 and reduce the difficulty of production, the transition part 330 can be of unified specifications, that is, the size of the transition part 330 is fixed, for example, it is designed such that the outer diameter of the transition part 330 is equal to the inner diameter of the opening of the housing 100 Much the same.

When the connecting part 310 is sleeved outside the housing 100, as shown in FIGS. 2, 4 and 5, the diameter of the connecting part 310 is larger than the diameter of the connecting end of the transition part 330 and the connecting part 310. Therefore, between the transition part 330 and the connecting part A second circular chamfer 360 is provided between the transition portion 330 and the connecting portion 310 to prevent stress concentration here from affecting the strength of the cover 300 . Both ends of the second circular chamfer 360 are smoothly transitionally connected to the transition portion 330 and the connecting portion 310 .

When the connecting portion 310 is inserted into the housing 100, as shown in Figures 3 and 6, the diameter of the connecting portion 310 is the same as the diameter of the connecting end, and at this time the connecting portion 310 is butted with the connecting end.

The transition portion 330 forms an arc segment along the axial cross-section. When the connecting portion 310 and the flat portion 320 have a certain size, the larger the inner diameter of the arc segment, the longer and steeper the arc segment will be along the axial direction. The less smooth the transition between the arc segment and the connecting portion 310 and the flat portion 320 is, the easier it is for stress concentration to occur at the transition point, which affects the strength. With the same raw material, the longer the arc segment is along the axial direction, the larger the volume of the cover 300 will be. The larger, the thinner the wall thickness, the worse the strength; at the same time, the smaller the inner diameter of the arc segment, the gentler the arc segment, the greater the angle between the flow direction of the liquid refrigerant medium and the arc segment, the greater the second force, The weaker the cover body 300 is, the gentler the arc segment is, the smaller the length of the transition segment along the axial direction is, and the smaller the volume of the cover body 300 is. In this embodiment, the central axis of the optional housing 100 passes through the center of the transition portion 330, so that the gentleness and axial length of the arc segment are both moderate. Taking into account the volume and thickness, the strength of the cover 300 can be maximized. Value for money.

The impact resistance test results of the cover 300 in this application are shown in Table 1, and the life-D/d ₁ relationship diagram obtained from the test results is shown in Figure 7.

Table 1

D/d 1	Lifespan/time
1.2	57532
1.3	93635
1.4	200000
1.5	376423
1.6	658410

It can be clearly seen from Table 1 and Figure 7 that when D/d ₁ ≥ 1.4, that is, d ₁ ≤ D/1.4, the life of the cover 300 is significantly longer, that is, the strength and impact resistance of the cover 300 are significantly improved. .

The technical features of the above embodiments can be combined in any way. To simplify the description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, All should be considered to be within the scope of this manual.

The above-described embodiments only express several implementation modes of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all fall within the protection scope of the present application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims (10)

1. A multi-tube pressure vessel includes a shell, a cover and at least two pipes. One end of the shell is open, and the cover is located at the open end and connected to the shell;

   It is characterized in that the cover body includes a planar portion arranged in a planar shape, the planar portion is provided at an end of the cover body away from the opening, and the planar portion is provided with a hole corresponding to each of the pipes. a mounting hole through which one end of the pipe extends into the housing;

   The inner diameter of the housing is D, the maximum diameter of the flat part is d ₁ , and the following relationship is satisfied between D and d ₁ : d ₁ ≤ D/1.4.
2. The multi-tube pressure vessel according to claim 1, wherein a flange is provided on one side of the flat portion facing the housing, and the flange is surrounded by the corresponding mounting hole and connected with the The hole walls of the mounting holes are connected through fillet transitions;

   Wherein, the inner hole diameter of the flange is d ₂ , the radius of the fillet is r, d ₁ , d ₂ and r satisfy the following relationship: d ₁ ≥ 2.1 (d ₂ +2r).
3. The multi-tube pressure vessel according to claim 1, wherein the cover further includes a connecting portion and a transition portion, the cover is connected to the shell through the connecting portion, and the connecting portion passes through the transition portion. The part is connected to the plane part.
4. The multi-tube pressure vessel according to claim 3, wherein the transition part is an arc-shaped transition part, and the center of the arc-shaped transition part is located inside the cover body.
5. The multi-tube pressure vessel according to claim 4, wherein a first circular chamfer is provided between the transition part and the flat part.
6. The multi-tube pressure vessel according to claim 5, wherein the radius of the first circular chamfer is R ₁ , the wall thickness of the cover is δ, and the relationship between R ₁ and δ satisfies the following Relationship formula: R ₁ ≥ δ.
7. The multi-tube pressure vessel according to claim 5, wherein the radius of the first circular chamfer is R ₁ , the inner diameter of the transition part is R ₂ , and the relationship between R ₁ and R ₂ satisfies The following relationship: R ₂ >R ₁ .
8. The multi-piece pressure vessel of claim 5, wherein the central axis of the housing passes through the center of the transition portion.
9. The multi-tube pressure vessel according to claim 3, wherein the connecting part is sleeved outside the shell and fixedly connected, and a second circular chamfer is provided between the transition part and the connecting part.
10. The multi-tube pressure vessel according to claim 3, wherein the connecting portion is inserted into the housing and fixedly connected.

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