KR20170125287A - Heat exchanger - Google Patents

Abstract

The present invention relates to a heat exchanger (1), comprising: a fluid pipe flow outer container (2); and a fluid pipe flow heat exchanging tube (6) disposed inside the outer container (2). In this case, the heat exchanger (1) enables at least one end part of the heat exchanging tube (6) to be connected to the outer container (2) through a fluid sealing method by an insertion-rotation-connection unit.

Description

Heat Exchanger {HEAT EXCHANGER}

The present invention relates particularly to a heat exchanger suitable for use as a coupling part having the function of an accumulator in the refrigerant circulation system and at the same time the function of an internal heat exchanger. The accumulator is a component of the refrigerant circulation system, in which the refrigerant flow consisting of the liquid phase and the gas phase is separated, and the liquid component is collected. In the internal heat exchanger, heat is transferred from the high pressure flow of the refrigerant to the low pressure flow of the refrigerant. The accumulator-internal heat exchanger is a component of the refrigerant circulation system, which realizes the above-mentioned two functions in one part.

Prior art, for example US 6,463,757 B1, discloses such heat exchangers. In this document, the internal heat exchanger and the accumulator are described as coupling parts. In this case, the function of the internal heat exchanger is realized by arranging a heat exchange tube in the outer container, wherein the heat exchange tube circulates around the outer container including the low-pressure refrigerant, Inside, high-pressure refrigerant is perfused. The high pressure level refrigerant discharges a portion of its heat to the low pressure level refrigerant. At the same time, the heat exchange tubes penetrate the container cover and are then correspondingly connected to the refrigerant lines of the circulation system via a side flange connection. A disadvantage of such tube perforations is that these perforations are made in a relatively complex manner and must be assembled in a pressure-tight manner. This process is complicated and disadvantageous, especially when the pressure level difference between the individual container spaces is large and there is a difficulty in sealing the fluid streams which may be mutually sealed or out of the fluid streams.

EP 1 703 192 B1 discloses a tubular connecting pipe and a bayonet coupling (= baronet connecting part) for a connecting body which can be connected in a form-fitting manner to the connecting pipe Wherein the Baronet coupling requires an additional locking body in addition to the connecting body and the connecting pipe and the locking body connects the connecting pipe and the connecting body while forming a shape coupling. However, the advantages of the Baron coupling as a form of connection of the components and pipelines of the heating device with respect to safety and simplicity of handling are partly offset by the complexity of the additional member in designing such a manner.

In addition, US 3,537,730 A discloses a coupling member for a pipe connection wherein the pipe connection is also formed by a three part Bajonet coupling.

The Baronet coupling refers to the connection of two cylindrical parts that can be quickly formed and removed in the longitudinal axis. The parts are connected to each other in a shape-fitting manner by rotation in the opposite direction to the fitting method and, in some cases, can be separated again.

The object of the present invention is to design a heat exchanger which is structurally simple and safe from the viewpoint of the connecting members, in which case the connection of the heat exchanging tube and the container, which can support the load in the axial direction and is fluid tight, must be designed.

The above object is solved by an object according to claim 1. Improvements are described in the dependent patent claims.

Particularly, the above object of the present invention is solved by a heat exchanger having a fluid perfusion outer container. A heat exchange tube, which is a fluid flow type, is also disposed in the outer container. The fluid passing through the outer vessel and the fluid passing through the heat exchange tube can be materially different and can be at different pressure levels. According to the concept, at least one end of the heat exchange tube is fluid-tightly connected to the outer vessel by an insert-turn-connection in the form of a bayonet lock. In this case, the end portion of the heat exchange tube does not penetrate the outer container, so that the penetration portion of the heat exchange tube does not exist. Nevertheless, in the heat exchange tube, a fluid passage for the fluid is formed in the wall, the container base or the container cover and, correspondingly, a connection option for fluid connection is provided outside the outer container. The heat exchange tube is received in the outer container without penetrating the outer container. This makes it possible to avoid the connection to be externally sealed with respect to the outer container.

The insert-turn-connection also refers to a baronet connection and a penetration bolt made up of longitudinal and transverse slots in a narrower sense. In connection with the manufacturing technique, the above-mentioned connection type is particularly preferable because no tool is required for manufacturing such a connection. Also, as long as it is designed properly, the connection portion can be fixed not only in the axial direction but also in the radial direction, and can be formed quickly and likewise can be quickly separated again.

Particularly preferably, the insertion-rotation connection comprises a locking member in the end region of the heat exchange tube, a corresponding insertion opening for the locking member in the outer container, and an undercut area connected axially to the insertion opening have.

Particularly preferably, the locking member is formed as a flange or ridge which is oval or elliptical in the radial direction in the end region of the heat exchange tube as viewed in cross section of the heat exchange tube. Preferably, the insertion opening in the outer container is formed with an oval or elliptical recess corresponding to the shape of the oval or elliptical locking member. The insertion opening for the heat exchange tube in the outer vessel is axially connected to the undercut region. The sector of the undercut region is formed as a locking position area for the locking member. The locking position area is preferably offset about 90 degrees with respect to the insertion opening so that the tube end for forming the insertion-rotation-connection part is first inserted axially into the undercut area through the insertion area, . In this case, the locking member reaches the locked position area and can not move further in the axial direction at this locked position.

Particularly preferably, the locking member of the heat exchange tube is engaged and fixed to the locking position area of the outer container.

To improve or realize the sealing effect, for example as a sealing ring, a sealing means is arranged between the free end of the heat exchange tube and the locking member, preferably in the heat exchange tube, and consequently the sealing ring acts on the insertion opening of the outer container And seals the inner space of the outer container with respect to the fluid passing through the heat exchange tube.

Preferably, the heat exchange tube is formed as a spiral tube between both end regions of the tube.

The outer container preferably comprises a cylindrical outer container jacket and a container cover and a container base, respectively, which limit the end sides of such outer container jacket.

According to an improvement of the above-described embodiment, one end of the heat exchange tube is connected to the container cover by an insertion-rotation-connection part, and the other end of the heat exchange tube is connected to the container base and the fluid seal . In such an embodiment, the perforations of the heat exchange tube through the outer vessel can be completely omitted.

Preferably the cylindrical inner container is coaxially disposed in the outer container jacket, and particularly preferably the heat exchange tube as a helical tube is disposed between the inner container and the outer container.

Particularly preferably, the heat exchanger having the above-described structure is used as a coupling part composed of an accumulator and an internal heat exchanger in a refrigerant circulation system at a vertical fitting position of the container axis. In this case, the inner container is formed of an accumulator for refrigerant. A low-pressure flow of refrigerant flows from the top to the bottom between the spiral tube and the outer and inner containers, and the high-pressure flow in the spiral tube flows from the bottom to the top.

Particularly preferably, the heat exchanger of the type described above is used in a refrigerant circulation system comprising carbon dioxide R744 as a high-pressure refrigerant.

Further details, features and advantages of embodiments according to the present invention will be apparent from the following detailed description of embodiments with reference to the accompanying drawings. Explanation of drawings:
1 is a longitudinal sectional view of a heat exchanger designed as an accumulator / internal heat exchanger,
Figure 2a shows the inner container of the accumulator,
2B is a view showing an outer container having a container cover and a container base,
Figure 3a is a perspective view of a heat exchange tube,
3B is a longitudinal sectional view of the heat exchange tube,
4A is a plan view of the heat exchange tube end,
4B is a longitudinal sectional view of the end portion of the heat exchange tube,
4C is a view showing the container cover from below,
5 is a longitudinal sectional view of the container base, and
6 is a perspective view showing the upper end of the heat exchange tube;

Fig. 1 is a longitudinal sectional view of a heat exchanger 1 as a coupling part composed of an accumulator and an internal heat exchanger. The heat exchanger 1 basically consists of an outer container 2 and an inner container 3 coaxially arranged in the outer container 2. [ A heat exchange tube (6) is arranged between the outer container (2) and the inner container (3), and the heat exchange tube is designed as a spiral tube. The outer container 2 consists of a cylindrical container jacket in the illustrated embodiment, the upper end of which is closed by a container cover 4 and the lower end is closed by a container base 5. The heat exchange tubes 6 are respectively connected to the container cover 4 at the upper end through the insert-rotation-connection part 9 and to the container base 5 at the lower end. The function of the internal heat exchanger is realized by allowing the heat exchange tube 6 to flow from the high pressure inlet 8 to the high pressure outlet 7 and from the bottom to the top by the high temperature refrigerant at the high pressure level. A low-temperature low-temperature refrigerant flows through the gap between the outer vessel 2 and the inner vessel 3 and absorbs heat from the heat exchange tube 6. [ Because heat is transferred inside the refrigerant circulation system, this type of heat exchanger is also referred to as an internal heat exchanger or an undercooling heat exchanger. The second function of the heat exchanger 1 is a collector or accumulator function. In this case, the low-temperature refrigerant in the liquid state is separated from the refrigerant flow at the low-pressure level and accumulated in the inner vessel (3). The low temperature refrigerant in the gaseous state is heated and overheated by the heat exchange tube (6). Particularly preferably, two functions are implemented in one small component. The manner of joining the ends of the heat exchange tubes 6 in the outer vessel 2 reduces the potential leakage locations and implements a quick, reliable and simple assembly possibility through the insert-turn-connection 9 of the Barney Lock type .

The basic components of the heat exchanger 1 are shown separately and in perspective in Figures 2a and 2b and 3a and 3b.

Figure 2a shows the inner vessel 3, which realizes the liquid-gas-mixture separation and accumulation function of the low-pressure level refrigerant in the inner space. Since the inner container does not have to withstand a large pressure difference, it can be designed as hard plastic.

Fig. 2b shows an outer container 2 having a container cover 4 and a container base 5. Fig. The outer container 2 must be designed in a liquid and pressure seal manner because the dominant low pressure level is higher than the ambient pressure, especially for high pressure refrigerants. The vessel cover (4) and the vessel base (5) have connections for the refrigerant lines at the inlet and outlet of the two pressure levels. The penetration of the heat exchange tube 6 is not designed, and therefore the sealing action in this regard can be omitted. Instead of the perforations of the ends of the heat exchange tubes 6, the ends are connected to the container base 5 and the container cover 4 by means of an insert-rotation-connection part so that the connections for the refrigerant lines of high- It can be formed integrally with the container base 5 and the container cover 4 directly. This minimizes the risk of leakage and provides a more secure component by virtue of the structure shown in addition to the advantages of manufacturing the heat exchanger (1).

3a and 3b , heat exchange tubes 6 are shown in perspective and longitudinal sections, respectively. The heat exchange tube 6 is wound with a helical tube. The upper end of the spiral tube is axially upwardly directed and is received by the container cover (4). Likewise, the lower end of the helical tube is axially downwardly directed and fixed in the container base 5 by means of an insert-turn-connection in such a way that it is offset relative to the axial position. The end portions of the heat exchange tubes 6 are designed as sealing rings 10 as O-shaped rings, each acting in a radial direction. In the lower end region of the heat exchange tube 6 in Fig. 3B where the heat exchange tube 6 is shown in longitudinal section, the locking member 11 is shown in cross-section.

Figures 4a , 4b and 4c show a partial enlarged cross-sectional view of the structural design of the insert-turn-connection. The positions of the drawings are connected to each other by a one-dot chain line. Figure 4a shows the end of the heat exchange tube 6 in plan view. The contour of the circular tube cross section extends in the form of a flange in the region of the locking member 11 of the oval or elliptical bulge. The seal ring 10 is shown in a plan view as a circular ring formed around the tube cross section. In Figure 4b the top end region of the heat exchange tube 6 is shown in longitudinal section. The locking member 11 of Figure 4a is shown as a radial tube extension in the form of a flange or web in Figure 4b, shown in longitudinal section. A sealing ring 10 formed of an O-shaped ring is disposed between the locking member 11 and the upper free end of the heat exchange tube 6.

Figure 4c shows the container cover 4 with the insertion opening 12 for the upper end of the heat exchange tube 6 viewed from below. The insertion opening (12) is formed in a recess corresponding to the shape of the locking member (11) of the heat exchange tube (6). The container cover 4 is seen from below in the view according to Fig. 4c. The heat exchange tube 6 is inserted in the radial direction from the bottom until it stops into the container cover 4, that is, into the insertion opening 12. In the container cover 4, at the end of the insertion opening 12 is formed an undercut region 13 for the locking member 11, which is shown in broken lines. In the inserted state, the heat exchange tube 6 is rotated in the clockwise direction by about 90 degrees, whereby the locking member 11 reaches the locking position region 14. [ In this locking position the heat exchange tubes 6 are held axially by undercuts and may not move axially or radially. In alternative embodiments not shown in the figures, other types of corresponding shapes for design as locking member 11 and insertion opening 12 may be selected. For example, by the asymmetrical design of the locking member 11, there can be only one starting state at the time of assembly, thereby achieving a situation in which defective assembly processes can be excluded.

5 , the heat exchanger 1 in the region of the container base 5 is shown enlarged in longitudinal section. Also in this figure, the heat exchange tube 6 is cut in the end region, inserted in the insertion opening 12, and shown in a locked position. The locking member 11 is located in the locking position area, at which time the locking member completely occupies the locking position area. The sealing ring 10 is disposed between the tube end and the locking member toward the lower free end of the heat exchange tube 6 and seals the heat exchange tube 6 toward the inner space of the outer vessel 2. [

6 is a perspective view of a heat exchange tube 6 having an upper end and an indicated container cover 4 in the upper region. The upper end region of the heat exchange tube 6 shows the locking member 11 and the sealing ring 10 designed similar to the lower end of the heat exchange tube 6.

The advantages of the insertion-rotation-connection are summarized as follows:

The insert-turn-connection of the ends of the heat exchange tubes 6 in the container cover 4 and the container base 5 is a connection which can be quickly, reliably and simply formed, The load can be sustained. In addition, no special tools are needed to design such connections.

1: Heat exchanger
2: outer container
3: Internal container
4: Container cover
5: container base
6: Heat exchange tube, spiral tube
7: High pressure outlet
8: High pressure inlet
9: Insertion-rotation-connection
10: seal ring
11: locking member
12: insertion opening
13: undercut area
14: Locked position area

Claims (14)

A heat exchanger (1) comprising a fluid-flow external vessel (2) and a fluid-flow heat exchange tube (6) disposed in the external vessel (2)
Characterized in that at least one end of said heat exchange tube (6) is fluid-tightly connected with said outer container (2) by means of an insert-turn-connection. The method according to claim 1,
(12) in the outer container (2) and an insertion opening (12) in the end region of the heat exchange tube (6) , And an undercut area (13). 3. The method of claim 2,
Characterized in that the locking member (11) is formed as an elliptical flange in the end region of the heat exchange tube (6). 3. The method of claim 2,
Characterized in that the insertion opening (12) in the outer container (2) is formed as an elliptical recess so as to correspond to the locking member (11). 3. The method of claim 2,
Characterized in that the locking member (11) of the heat exchange tube (6) is formed in such a way that it is engaged and fixed in the locking position area (14) of the outer container (2). 3. The method of claim 2,
Characterized in that a sealing ring (10) is arranged between the free end of the heat exchange tube (6) and the locking member (11). The method according to claim 1,
Characterized in that the heat exchange tube (6) is formed as a spiral tube between both end regions. The method according to claim 1,
Characterized in that the outer container (2) is formed by a cylindrical outer container jacket, a container cover (4) and a container base (5) for limiting the outer container jacket at the end side. heat transmitter. 9. The method of claim 8,
Wherein one end of the heat exchange tube 6 is connected to the container cover 4 by an insert-rotation-connection part and the other end of the heat exchange tube 6 is connected to the container base 4 by an insert- (5). ≪ / RTI > 9. The method of claim 8,
Characterized in that a cylindrical inner container (3) is arranged coaxially with the outer container jacket. 8. The method of claim 7,
Characterized in that the heat exchange tube (6) is arranged as a spiral tube between the inner vessel (3) and the outer vessel (2). The method according to claim 1,
And the insert-rotation-connection part can be fixed by being rotated by about 90 degrees. Wherein the inner vessel (3) is formed as an accumulator and the low pressure flow between the spiral tube and the outer and inner vessels (2, 3) is used as a combined component consisting of an accumulator and an inner heat bridging ring in the refrigerant circulation system The use of a heat exchanger (1) according to any one of the claims 1 to 12, wherein it flows from the top to the bottom and the high-pressure flow in the spiral tube flows from the bottom to the top. Use of the heat exchanger (1) according to claim 13 for use in a refrigerant circulation system comprising carbon dioxide R744 as high-pressure refrigerant.

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